diff options
| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
| commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
| tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/gpu/drm/i915/i915_irq.c | |
Initial import
Diffstat (limited to 'drivers/gpu/drm/i915/i915_irq.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 4426 |
1 files changed, 4426 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c new file mode 100644 index 000000000..b0df8d104 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -0,0 +1,4426 @@ +/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*- + */ +/* + * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/sysrq.h> +#include <linux/slab.h> +#include <linux/circ_buf.h> +#include <drm/drmP.h> +#include <drm/i915_drm.h> +#include "i915_drv.h" +#include "i915_trace.h" +#include "intel_drv.h" + +/** + * DOC: interrupt handling + * + * These functions provide the basic support for enabling and disabling the + * interrupt handling support. There's a lot more functionality in i915_irq.c + * and related files, but that will be described in separate chapters. + */ + +static const u32 hpd_ibx[HPD_NUM_PINS] = { + [HPD_CRT] = SDE_CRT_HOTPLUG, + [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG, + [HPD_PORT_B] = SDE_PORTB_HOTPLUG, + [HPD_PORT_C] = SDE_PORTC_HOTPLUG, + [HPD_PORT_D] = SDE_PORTD_HOTPLUG +}; + +static const u32 hpd_cpt[HPD_NUM_PINS] = { + [HPD_CRT] = SDE_CRT_HOTPLUG_CPT, + [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG_CPT, + [HPD_PORT_B] = SDE_PORTB_HOTPLUG_CPT, + [HPD_PORT_C] = SDE_PORTC_HOTPLUG_CPT, + [HPD_PORT_D] = SDE_PORTD_HOTPLUG_CPT +}; + +static const u32 hpd_mask_i915[HPD_NUM_PINS] = { + [HPD_CRT] = CRT_HOTPLUG_INT_EN, + [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_EN, + [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_EN, + [HPD_PORT_B] = PORTB_HOTPLUG_INT_EN, + [HPD_PORT_C] = PORTC_HOTPLUG_INT_EN, + [HPD_PORT_D] = PORTD_HOTPLUG_INT_EN +}; + +static const u32 hpd_status_g4x[HPD_NUM_PINS] = { + [HPD_CRT] = CRT_HOTPLUG_INT_STATUS, + [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_G4X, + [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_G4X, + [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS, + [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS, + [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS +}; + +static const u32 hpd_status_i915[HPD_NUM_PINS] = { /* i915 and valleyview are the same */ + [HPD_CRT] = CRT_HOTPLUG_INT_STATUS, + [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_I915, + [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_I915, + [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS, + [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS, + [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS +}; + +/* IIR can theoretically queue up two events. Be paranoid. */ +#define GEN8_IRQ_RESET_NDX(type, which) do { \ + I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \ + POSTING_READ(GEN8_##type##_IMR(which)); \ + I915_WRITE(GEN8_##type##_IER(which), 0); \ + I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \ + POSTING_READ(GEN8_##type##_IIR(which)); \ + I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \ + POSTING_READ(GEN8_##type##_IIR(which)); \ +} while (0) + +#define GEN5_IRQ_RESET(type) do { \ + I915_WRITE(type##IMR, 0xffffffff); \ + POSTING_READ(type##IMR); \ + I915_WRITE(type##IER, 0); \ + I915_WRITE(type##IIR, 0xffffffff); \ + POSTING_READ(type##IIR); \ + I915_WRITE(type##IIR, 0xffffffff); \ + POSTING_READ(type##IIR); \ +} while (0) + +/* + * We should clear IMR at preinstall/uninstall, and just check at postinstall. + */ +#define GEN5_ASSERT_IIR_IS_ZERO(reg) do { \ + u32 val = I915_READ(reg); \ + if (val) { \ + WARN(1, "Interrupt register 0x%x is not zero: 0x%08x\n", \ + (reg), val); \ + I915_WRITE((reg), 0xffffffff); \ + POSTING_READ(reg); \ + I915_WRITE((reg), 0xffffffff); \ + POSTING_READ(reg); \ + } \ +} while (0) + +#define GEN8_IRQ_INIT_NDX(type, which, imr_val, ier_val) do { \ + GEN5_ASSERT_IIR_IS_ZERO(GEN8_##type##_IIR(which)); \ + I915_WRITE(GEN8_##type##_IER(which), (ier_val)); \ + I915_WRITE(GEN8_##type##_IMR(which), (imr_val)); \ + POSTING_READ(GEN8_##type##_IMR(which)); \ +} while (0) + +#define GEN5_IRQ_INIT(type, imr_val, ier_val) do { \ + GEN5_ASSERT_IIR_IS_ZERO(type##IIR); \ + I915_WRITE(type##IER, (ier_val)); \ + I915_WRITE(type##IMR, (imr_val)); \ + POSTING_READ(type##IMR); \ +} while (0) + +static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir); + +/* For display hotplug interrupt */ +void +ironlake_enable_display_irq(struct drm_i915_private *dev_priv, u32 mask) +{ + assert_spin_locked(&dev_priv->irq_lock); + + if (WARN_ON(!intel_irqs_enabled(dev_priv))) + return; + + if ((dev_priv->irq_mask & mask) != 0) { + dev_priv->irq_mask &= ~mask; + I915_WRITE(DEIMR, dev_priv->irq_mask); + POSTING_READ(DEIMR); + } +} + +void +ironlake_disable_display_irq(struct drm_i915_private *dev_priv, u32 mask) +{ + assert_spin_locked(&dev_priv->irq_lock); + + if (WARN_ON(!intel_irqs_enabled(dev_priv))) + return; + + if ((dev_priv->irq_mask & mask) != mask) { + dev_priv->irq_mask |= mask; + I915_WRITE(DEIMR, dev_priv->irq_mask); + POSTING_READ(DEIMR); + } +} + +/** + * ilk_update_gt_irq - update GTIMR + * @dev_priv: driver private + * @interrupt_mask: mask of interrupt bits to update + * @enabled_irq_mask: mask of interrupt bits to enable + */ +static void ilk_update_gt_irq(struct drm_i915_private *dev_priv, + uint32_t interrupt_mask, + uint32_t enabled_irq_mask) +{ + assert_spin_locked(&dev_priv->irq_lock); + + WARN_ON(enabled_irq_mask & ~interrupt_mask); + + if (WARN_ON(!intel_irqs_enabled(dev_priv))) + return; + + dev_priv->gt_irq_mask &= ~interrupt_mask; + dev_priv->gt_irq_mask |= (~enabled_irq_mask & interrupt_mask); + I915_WRITE(GTIMR, dev_priv->gt_irq_mask); + POSTING_READ(GTIMR); +} + +void gen5_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask) +{ + ilk_update_gt_irq(dev_priv, mask, mask); +} + +void gen5_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask) +{ + ilk_update_gt_irq(dev_priv, mask, 0); +} + +static u32 gen6_pm_iir(struct drm_i915_private *dev_priv) +{ + return INTEL_INFO(dev_priv)->gen >= 8 ? GEN8_GT_IIR(2) : GEN6_PMIIR; +} + +static u32 gen6_pm_imr(struct drm_i915_private *dev_priv) +{ + return INTEL_INFO(dev_priv)->gen >= 8 ? GEN8_GT_IMR(2) : GEN6_PMIMR; +} + +static u32 gen6_pm_ier(struct drm_i915_private *dev_priv) +{ + return INTEL_INFO(dev_priv)->gen >= 8 ? GEN8_GT_IER(2) : GEN6_PMIER; +} + +/** + * snb_update_pm_irq - update GEN6_PMIMR + * @dev_priv: driver private + * @interrupt_mask: mask of interrupt bits to update + * @enabled_irq_mask: mask of interrupt bits to enable + */ +static void snb_update_pm_irq(struct drm_i915_private *dev_priv, + uint32_t interrupt_mask, + uint32_t enabled_irq_mask) +{ + uint32_t new_val; + + WARN_ON(enabled_irq_mask & ~interrupt_mask); + + assert_spin_locked(&dev_priv->irq_lock); + + new_val = dev_priv->pm_irq_mask; + new_val &= ~interrupt_mask; + new_val |= (~enabled_irq_mask & interrupt_mask); + + if (new_val != dev_priv->pm_irq_mask) { + dev_priv->pm_irq_mask = new_val; + I915_WRITE(gen6_pm_imr(dev_priv), dev_priv->pm_irq_mask); + POSTING_READ(gen6_pm_imr(dev_priv)); + } +} + +void gen6_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask) +{ + if (WARN_ON(!intel_irqs_enabled(dev_priv))) + return; + + snb_update_pm_irq(dev_priv, mask, mask); +} + +static void __gen6_disable_pm_irq(struct drm_i915_private *dev_priv, + uint32_t mask) +{ + snb_update_pm_irq(dev_priv, mask, 0); +} + +void gen6_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask) +{ + if (WARN_ON(!intel_irqs_enabled(dev_priv))) + return; + + __gen6_disable_pm_irq(dev_priv, mask); +} + +void gen6_reset_rps_interrupts(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t reg = gen6_pm_iir(dev_priv); + + spin_lock_irq(&dev_priv->irq_lock); + I915_WRITE(reg, dev_priv->pm_rps_events); + I915_WRITE(reg, dev_priv->pm_rps_events); + POSTING_READ(reg); + dev_priv->rps.pm_iir = 0; + spin_unlock_irq(&dev_priv->irq_lock); +} + +void gen6_enable_rps_interrupts(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + spin_lock_irq(&dev_priv->irq_lock); + + WARN_ON(dev_priv->rps.pm_iir); + WARN_ON(I915_READ(gen6_pm_iir(dev_priv)) & dev_priv->pm_rps_events); + dev_priv->rps.interrupts_enabled = true; + I915_WRITE(gen6_pm_ier(dev_priv), I915_READ(gen6_pm_ier(dev_priv)) | + dev_priv->pm_rps_events); + gen6_enable_pm_irq(dev_priv, dev_priv->pm_rps_events); + + spin_unlock_irq(&dev_priv->irq_lock); +} + +u32 gen6_sanitize_rps_pm_mask(struct drm_i915_private *dev_priv, u32 mask) +{ + /* + * SNB,IVB can while VLV,CHV may hard hang on looping batchbuffer + * if GEN6_PM_UP_EI_EXPIRED is masked. + * + * TODO: verify if this can be reproduced on VLV,CHV. + */ + if (INTEL_INFO(dev_priv)->gen <= 7 && !IS_HASWELL(dev_priv)) + mask &= ~GEN6_PM_RP_UP_EI_EXPIRED; + + if (INTEL_INFO(dev_priv)->gen >= 8) + mask &= ~GEN8_PMINTR_REDIRECT_TO_NON_DISP; + + return mask; +} + +void gen6_disable_rps_interrupts(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + spin_lock_irq(&dev_priv->irq_lock); + dev_priv->rps.interrupts_enabled = false; + spin_unlock_irq(&dev_priv->irq_lock); + + cancel_work_sync(&dev_priv->rps.work); + + spin_lock_irq(&dev_priv->irq_lock); + + I915_WRITE(GEN6_PMINTRMSK, gen6_sanitize_rps_pm_mask(dev_priv, ~0)); + + __gen6_disable_pm_irq(dev_priv, dev_priv->pm_rps_events); + I915_WRITE(gen6_pm_ier(dev_priv), I915_READ(gen6_pm_ier(dev_priv)) & + ~dev_priv->pm_rps_events); + + spin_unlock_irq(&dev_priv->irq_lock); + + synchronize_irq(dev->irq); +} + +/** + * ibx_display_interrupt_update - update SDEIMR + * @dev_priv: driver private + * @interrupt_mask: mask of interrupt bits to update + * @enabled_irq_mask: mask of interrupt bits to enable + */ +void ibx_display_interrupt_update(struct drm_i915_private *dev_priv, + uint32_t interrupt_mask, + uint32_t enabled_irq_mask) +{ + uint32_t sdeimr = I915_READ(SDEIMR); + sdeimr &= ~interrupt_mask; + sdeimr |= (~enabled_irq_mask & interrupt_mask); + + WARN_ON(enabled_irq_mask & ~interrupt_mask); + + assert_spin_locked(&dev_priv->irq_lock); + + if (WARN_ON(!intel_irqs_enabled(dev_priv))) + return; + + I915_WRITE(SDEIMR, sdeimr); + POSTING_READ(SDEIMR); +} + +static void +__i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe, + u32 enable_mask, u32 status_mask) +{ + u32 reg = PIPESTAT(pipe); + u32 pipestat = I915_READ(reg) & PIPESTAT_INT_ENABLE_MASK; + + assert_spin_locked(&dev_priv->irq_lock); + WARN_ON(!intel_irqs_enabled(dev_priv)); + + if (WARN_ONCE(enable_mask & ~PIPESTAT_INT_ENABLE_MASK || + status_mask & ~PIPESTAT_INT_STATUS_MASK, + "pipe %c: enable_mask=0x%x, status_mask=0x%x\n", + pipe_name(pipe), enable_mask, status_mask)) + return; + + if ((pipestat & enable_mask) == enable_mask) + return; + + dev_priv->pipestat_irq_mask[pipe] |= status_mask; + + /* Enable the interrupt, clear any pending status */ + pipestat |= enable_mask | status_mask; + I915_WRITE(reg, pipestat); + POSTING_READ(reg); +} + +static void +__i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe, + u32 enable_mask, u32 status_mask) +{ + u32 reg = PIPESTAT(pipe); + u32 pipestat = I915_READ(reg) & PIPESTAT_INT_ENABLE_MASK; + + assert_spin_locked(&dev_priv->irq_lock); + WARN_ON(!intel_irqs_enabled(dev_priv)); + + if (WARN_ONCE(enable_mask & ~PIPESTAT_INT_ENABLE_MASK || + status_mask & ~PIPESTAT_INT_STATUS_MASK, + "pipe %c: enable_mask=0x%x, status_mask=0x%x\n", + pipe_name(pipe), enable_mask, status_mask)) + return; + + if ((pipestat & enable_mask) == 0) + return; + + dev_priv->pipestat_irq_mask[pipe] &= ~status_mask; + + pipestat &= ~enable_mask; + I915_WRITE(reg, pipestat); + POSTING_READ(reg); +} + +static u32 vlv_get_pipestat_enable_mask(struct drm_device *dev, u32 status_mask) +{ + u32 enable_mask = status_mask << 16; + + /* + * On pipe A we don't support the PSR interrupt yet, + * on pipe B and C the same bit MBZ. + */ + if (WARN_ON_ONCE(status_mask & PIPE_A_PSR_STATUS_VLV)) + return 0; + /* + * On pipe B and C we don't support the PSR interrupt yet, on pipe + * A the same bit is for perf counters which we don't use either. + */ + if (WARN_ON_ONCE(status_mask & PIPE_B_PSR_STATUS_VLV)) + return 0; + + enable_mask &= ~(PIPE_FIFO_UNDERRUN_STATUS | + SPRITE0_FLIP_DONE_INT_EN_VLV | + SPRITE1_FLIP_DONE_INT_EN_VLV); + if (status_mask & SPRITE0_FLIP_DONE_INT_STATUS_VLV) + enable_mask |= SPRITE0_FLIP_DONE_INT_EN_VLV; + if (status_mask & SPRITE1_FLIP_DONE_INT_STATUS_VLV) + enable_mask |= SPRITE1_FLIP_DONE_INT_EN_VLV; + + return enable_mask; +} + +void +i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe, + u32 status_mask) +{ + u32 enable_mask; + + if (IS_VALLEYVIEW(dev_priv->dev)) + enable_mask = vlv_get_pipestat_enable_mask(dev_priv->dev, + status_mask); + else + enable_mask = status_mask << 16; + __i915_enable_pipestat(dev_priv, pipe, enable_mask, status_mask); +} + +void +i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe, + u32 status_mask) +{ + u32 enable_mask; + + if (IS_VALLEYVIEW(dev_priv->dev)) + enable_mask = vlv_get_pipestat_enable_mask(dev_priv->dev, + status_mask); + else + enable_mask = status_mask << 16; + __i915_disable_pipestat(dev_priv, pipe, enable_mask, status_mask); +} + +/** + * i915_enable_asle_pipestat - enable ASLE pipestat for OpRegion + */ +static void i915_enable_asle_pipestat(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (!dev_priv->opregion.asle || !IS_MOBILE(dev)) + return; + + spin_lock_irq(&dev_priv->irq_lock); + + i915_enable_pipestat(dev_priv, PIPE_B, PIPE_LEGACY_BLC_EVENT_STATUS); + if (INTEL_INFO(dev)->gen >= 4) + i915_enable_pipestat(dev_priv, PIPE_A, + PIPE_LEGACY_BLC_EVENT_STATUS); + + spin_unlock_irq(&dev_priv->irq_lock); +} + +/* + * This timing diagram depicts the video signal in and + * around the vertical blanking period. + * + * Assumptions about the fictitious mode used in this example: + * vblank_start >= 3 + * vsync_start = vblank_start + 1 + * vsync_end = vblank_start + 2 + * vtotal = vblank_start + 3 + * + * start of vblank: + * latch double buffered registers + * increment frame counter (ctg+) + * generate start of vblank interrupt (gen4+) + * | + * | frame start: + * | generate frame start interrupt (aka. vblank interrupt) (gmch) + * | may be shifted forward 1-3 extra lines via PIPECONF + * | | + * | | start of vsync: + * | | generate vsync interrupt + * | | | + * ___xxxx___ ___xxxx___ ___xxxx___ ___xxxx___ ___xxxx___ ___xxxx + * . \hs/ . \hs/ \hs/ \hs/ . \hs/ + * ----va---> <-----------------vb--------------------> <--------va------------- + * | | <----vs-----> | + * -vbs-----> <---vbs+1---> <---vbs+2---> <-----0-----> <-----1-----> <-----2--- (scanline counter gen2) + * -vbs-2---> <---vbs-1---> <---vbs-----> <---vbs+1---> <---vbs+2---> <-----0--- (scanline counter gen3+) + * -vbs-2---> <---vbs-2---> <---vbs-1---> <---vbs-----> <---vbs+1---> <---vbs+2- (scanline counter hsw+ hdmi) + * | | | + * last visible pixel first visible pixel + * | increment frame counter (gen3/4) + * pixel counter = vblank_start * htotal pixel counter = 0 (gen3/4) + * + * x = horizontal active + * _ = horizontal blanking + * hs = horizontal sync + * va = vertical active + * vb = vertical blanking + * vs = vertical sync + * vbs = vblank_start (number) + * + * Summary: + * - most events happen at the start of horizontal sync + * - frame start happens at the start of horizontal blank, 1-4 lines + * (depending on PIPECONF settings) after the start of vblank + * - gen3/4 pixel and frame counter are synchronized with the start + * of horizontal active on the first line of vertical active + */ + +static u32 i8xx_get_vblank_counter(struct drm_device *dev, int pipe) +{ + /* Gen2 doesn't have a hardware frame counter */ + return 0; +} + +/* Called from drm generic code, passed a 'crtc', which + * we use as a pipe index + */ +static u32 i915_get_vblank_counter(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long high_frame; + unsigned long low_frame; + u32 high1, high2, low, pixel, vbl_start, hsync_start, htotal; + struct intel_crtc *intel_crtc = + to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]); + const struct drm_display_mode *mode = + &intel_crtc->config->base.adjusted_mode; + + htotal = mode->crtc_htotal; + hsync_start = mode->crtc_hsync_start; + vbl_start = mode->crtc_vblank_start; + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + vbl_start = DIV_ROUND_UP(vbl_start, 2); + + /* Convert to pixel count */ + vbl_start *= htotal; + + /* Start of vblank event occurs at start of hsync */ + vbl_start -= htotal - hsync_start; + + high_frame = PIPEFRAME(pipe); + low_frame = PIPEFRAMEPIXEL(pipe); + + /* + * High & low register fields aren't synchronized, so make sure + * we get a low value that's stable across two reads of the high + * register. + */ + do { + high1 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK; + low = I915_READ(low_frame); + high2 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK; + } while (high1 != high2); + + high1 >>= PIPE_FRAME_HIGH_SHIFT; + pixel = low & PIPE_PIXEL_MASK; + low >>= PIPE_FRAME_LOW_SHIFT; + + /* + * The frame counter increments at beginning of active. + * Cook up a vblank counter by also checking the pixel + * counter against vblank start. + */ + return (((high1 << 8) | low) + (pixel >= vbl_start)) & 0xffffff; +} + +static u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int reg = PIPE_FRMCOUNT_GM45(pipe); + + return I915_READ(reg); +} + +/* raw reads, only for fast reads of display block, no need for forcewake etc. */ +#define __raw_i915_read32(dev_priv__, reg__) readl((dev_priv__)->regs + (reg__)) + +static int __intel_get_crtc_scanline(struct intel_crtc *crtc) +{ + struct drm_device *dev = crtc->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + const struct drm_display_mode *mode = &crtc->config->base.adjusted_mode; + enum pipe pipe = crtc->pipe; + int position, vtotal; + + vtotal = mode->crtc_vtotal; + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + vtotal /= 2; + + if (IS_GEN2(dev)) + position = __raw_i915_read32(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN2; + else + position = __raw_i915_read32(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN3; + + /* + * See update_scanline_offset() for the details on the + * scanline_offset adjustment. + */ + return (position + crtc->scanline_offset) % vtotal; +} + +static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe, + unsigned int flags, int *vpos, int *hpos, + ktime_t *stime, ktime_t *etime) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe]; + struct intel_crtc *intel_crtc = to_intel_crtc(crtc); + const struct drm_display_mode *mode = &intel_crtc->config->base.adjusted_mode; + int position; + int vbl_start, vbl_end, hsync_start, htotal, vtotal; + bool in_vbl = true; + int ret = 0; + unsigned long irqflags; + + if (!intel_crtc->active) { + DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled " + "pipe %c\n", pipe_name(pipe)); + return 0; + } + + htotal = mode->crtc_htotal; + hsync_start = mode->crtc_hsync_start; + vtotal = mode->crtc_vtotal; + vbl_start = mode->crtc_vblank_start; + vbl_end = mode->crtc_vblank_end; + + if (mode->flags & DRM_MODE_FLAG_INTERLACE) { + vbl_start = DIV_ROUND_UP(vbl_start, 2); + vbl_end /= 2; + vtotal /= 2; + } + + ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE; + + /* + * Lock uncore.lock, as we will do multiple timing critical raw + * register reads, potentially with preemption disabled, so the + * following code must not block on uncore.lock. + */ + spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); + + /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */ + + /* Get optional system timestamp before query. */ + if (stime) + *stime = ktime_get(); + + if (IS_GEN2(dev) || IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) { + /* No obvious pixelcount register. Only query vertical + * scanout position from Display scan line register. + */ + position = __intel_get_crtc_scanline(intel_crtc); + } else { + /* Have access to pixelcount since start of frame. + * We can split this into vertical and horizontal + * scanout position. + */ + position = (__raw_i915_read32(dev_priv, PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT; + + /* convert to pixel counts */ + vbl_start *= htotal; + vbl_end *= htotal; + vtotal *= htotal; + + /* + * In interlaced modes, the pixel counter counts all pixels, + * so one field will have htotal more pixels. In order to avoid + * the reported position from jumping backwards when the pixel + * counter is beyond the length of the shorter field, just + * clamp the position the length of the shorter field. This + * matches how the scanline counter based position works since + * the scanline counter doesn't count the two half lines. + */ + if (position >= vtotal) + position = vtotal - 1; + + /* + * Start of vblank interrupt is triggered at start of hsync, + * just prior to the first active line of vblank. However we + * consider lines to start at the leading edge of horizontal + * active. So, should we get here before we've crossed into + * the horizontal active of the first line in vblank, we would + * not set the DRM_SCANOUTPOS_INVBL flag. In order to fix that, + * always add htotal-hsync_start to the current pixel position. + */ + position = (position + htotal - hsync_start) % vtotal; + } + + /* Get optional system timestamp after query. */ + if (etime) + *etime = ktime_get(); + + /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */ + + spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); + + in_vbl = position >= vbl_start && position < vbl_end; + + /* + * While in vblank, position will be negative + * counting up towards 0 at vbl_end. And outside + * vblank, position will be positive counting + * up since vbl_end. + */ + if (position >= vbl_start) + position -= vbl_end; + else + position += vtotal - vbl_end; + + if (IS_GEN2(dev) || IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) { + *vpos = position; + *hpos = 0; + } else { + *vpos = position / htotal; + *hpos = position - (*vpos * htotal); + } + + /* In vblank? */ + if (in_vbl) + ret |= DRM_SCANOUTPOS_IN_VBLANK; + + return ret; +} + +int intel_get_crtc_scanline(struct intel_crtc *crtc) +{ + struct drm_i915_private *dev_priv = crtc->base.dev->dev_private; + unsigned long irqflags; + int position; + + spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); + position = __intel_get_crtc_scanline(crtc); + spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); + + return position; +} + +static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe, + int *max_error, + struct timeval *vblank_time, + unsigned flags) +{ + struct drm_crtc *crtc; + + if (pipe < 0 || pipe >= INTEL_INFO(dev)->num_pipes) { + DRM_ERROR("Invalid crtc %d\n", pipe); + return -EINVAL; + } + + /* Get drm_crtc to timestamp: */ + crtc = intel_get_crtc_for_pipe(dev, pipe); + if (crtc == NULL) { + DRM_ERROR("Invalid crtc %d\n", pipe); + return -EINVAL; + } + + if (!crtc->state->enable) { + DRM_DEBUG_KMS("crtc %d is disabled\n", pipe); + return -EBUSY; + } + + /* Helper routine in DRM core does all the work: */ + return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error, + vblank_time, flags, + crtc, + &to_intel_crtc(crtc)->config->base.adjusted_mode); +} + +static bool intel_hpd_irq_event(struct drm_device *dev, + struct drm_connector *connector) +{ + enum drm_connector_status old_status; + + WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); + old_status = connector->status; + + connector->status = connector->funcs->detect(connector, false); + if (old_status == connector->status) + return false; + + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", + connector->base.id, + connector->name, + drm_get_connector_status_name(old_status), + drm_get_connector_status_name(connector->status)); + + return true; +} + +static void i915_digport_work_func(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, dig_port_work); + u32 long_port_mask, short_port_mask; + struct intel_digital_port *intel_dig_port; + int i; + u32 old_bits = 0; + + spin_lock_irq(&dev_priv->irq_lock); + long_port_mask = dev_priv->long_hpd_port_mask; + dev_priv->long_hpd_port_mask = 0; + short_port_mask = dev_priv->short_hpd_port_mask; + dev_priv->short_hpd_port_mask = 0; + spin_unlock_irq(&dev_priv->irq_lock); + + for (i = 0; i < I915_MAX_PORTS; i++) { + bool valid = false; + bool long_hpd = false; + intel_dig_port = dev_priv->hpd_irq_port[i]; + if (!intel_dig_port || !intel_dig_port->hpd_pulse) + continue; + + if (long_port_mask & (1 << i)) { + valid = true; + long_hpd = true; + } else if (short_port_mask & (1 << i)) + valid = true; + + if (valid) { + enum irqreturn ret; + + ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd); + if (ret == IRQ_NONE) { + /* fall back to old school hpd */ + old_bits |= (1 << intel_dig_port->base.hpd_pin); + } + } + } + + if (old_bits) { + spin_lock_irq(&dev_priv->irq_lock); + dev_priv->hpd_event_bits |= old_bits; + spin_unlock_irq(&dev_priv->irq_lock); + schedule_work(&dev_priv->hotplug_work); + } +} + +/* + * Handle hotplug events outside the interrupt handler proper. + */ +#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000) + +static void i915_hotplug_work_func(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, hotplug_work); + struct drm_device *dev = dev_priv->dev; + struct drm_mode_config *mode_config = &dev->mode_config; + struct intel_connector *intel_connector; + struct intel_encoder *intel_encoder; + struct drm_connector *connector; + bool hpd_disabled = false; + bool changed = false; + u32 hpd_event_bits; + + mutex_lock(&mode_config->mutex); + DRM_DEBUG_KMS("running encoder hotplug functions\n"); + + spin_lock_irq(&dev_priv->irq_lock); + + hpd_event_bits = dev_priv->hpd_event_bits; + dev_priv->hpd_event_bits = 0; + list_for_each_entry(connector, &mode_config->connector_list, head) { + intel_connector = to_intel_connector(connector); + if (!intel_connector->encoder) + continue; + intel_encoder = intel_connector->encoder; + if (intel_encoder->hpd_pin > HPD_NONE && + dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_MARK_DISABLED && + connector->polled == DRM_CONNECTOR_POLL_HPD) { + DRM_INFO("HPD interrupt storm detected on connector %s: " + "switching from hotplug detection to polling\n", + connector->name); + dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark = HPD_DISABLED; + connector->polled = DRM_CONNECTOR_POLL_CONNECT + | DRM_CONNECTOR_POLL_DISCONNECT; + hpd_disabled = true; + } + if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) { + DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n", + connector->name, intel_encoder->hpd_pin); + } + } + /* if there were no outputs to poll, poll was disabled, + * therefore make sure it's enabled when disabling HPD on + * some connectors */ + if (hpd_disabled) { + drm_kms_helper_poll_enable(dev); + mod_delayed_work(system_wq, &dev_priv->hotplug_reenable_work, + msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY)); + } + + spin_unlock_irq(&dev_priv->irq_lock); + + list_for_each_entry(connector, &mode_config->connector_list, head) { + intel_connector = to_intel_connector(connector); + if (!intel_connector->encoder) + continue; + intel_encoder = intel_connector->encoder; + if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) { + if (intel_encoder->hot_plug) + intel_encoder->hot_plug(intel_encoder); + if (intel_hpd_irq_event(dev, connector)) + changed = true; + } + } + mutex_unlock(&mode_config->mutex); + + if (changed) + drm_kms_helper_hotplug_event(dev); +} + +static void ironlake_rps_change_irq_handler(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 busy_up, busy_down, max_avg, min_avg; + u8 new_delay; + + spin_lock(&mchdev_lock); + + I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS)); + + new_delay = dev_priv->ips.cur_delay; + + I915_WRITE16(MEMINTRSTS, MEMINT_EVAL_CHG); + busy_up = I915_READ(RCPREVBSYTUPAVG); + busy_down = I915_READ(RCPREVBSYTDNAVG); + max_avg = I915_READ(RCBMAXAVG); + min_avg = I915_READ(RCBMINAVG); + + /* Handle RCS change request from hw */ + if (busy_up > max_avg) { + if (dev_priv->ips.cur_delay != dev_priv->ips.max_delay) + new_delay = dev_priv->ips.cur_delay - 1; + if (new_delay < dev_priv->ips.max_delay) + new_delay = dev_priv->ips.max_delay; + } else if (busy_down < min_avg) { + if (dev_priv->ips.cur_delay != dev_priv->ips.min_delay) + new_delay = dev_priv->ips.cur_delay + 1; + if (new_delay > dev_priv->ips.min_delay) + new_delay = dev_priv->ips.min_delay; + } + + if (ironlake_set_drps(dev, new_delay)) + dev_priv->ips.cur_delay = new_delay; + + spin_unlock(&mchdev_lock); + + return; +} + +static void notify_ring(struct drm_device *dev, + struct intel_engine_cs *ring) +{ + if (!intel_ring_initialized(ring)) + return; + + trace_i915_gem_request_notify(ring); + + wake_up_all(&ring->irq_queue); +} + +static void vlv_c0_read(struct drm_i915_private *dev_priv, + struct intel_rps_ei *ei) +{ + ei->cz_clock = vlv_punit_read(dev_priv, PUNIT_REG_CZ_TIMESTAMP); + ei->render_c0 = I915_READ(VLV_RENDER_C0_COUNT); + ei->media_c0 = I915_READ(VLV_MEDIA_C0_COUNT); +} + +static bool vlv_c0_above(struct drm_i915_private *dev_priv, + const struct intel_rps_ei *old, + const struct intel_rps_ei *now, + int threshold) +{ + u64 time, c0; + + if (old->cz_clock == 0) + return false; + + time = now->cz_clock - old->cz_clock; + time *= threshold * dev_priv->mem_freq; + + /* Workload can be split between render + media, e.g. SwapBuffers + * being blitted in X after being rendered in mesa. To account for + * this we need to combine both engines into our activity counter. + */ + c0 = now->render_c0 - old->render_c0; + c0 += now->media_c0 - old->media_c0; + c0 *= 100 * VLV_CZ_CLOCK_TO_MILLI_SEC * 4 / 1000; + + return c0 >= time; +} + +void gen6_rps_reset_ei(struct drm_i915_private *dev_priv) +{ + vlv_c0_read(dev_priv, &dev_priv->rps.down_ei); + dev_priv->rps.up_ei = dev_priv->rps.down_ei; +} + +static u32 vlv_wa_c0_ei(struct drm_i915_private *dev_priv, u32 pm_iir) +{ + struct intel_rps_ei now; + u32 events = 0; + + if ((pm_iir & (GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_UP_EI_EXPIRED)) == 0) + return 0; + + vlv_c0_read(dev_priv, &now); + if (now.cz_clock == 0) + return 0; + + if (pm_iir & GEN6_PM_RP_DOWN_EI_EXPIRED) { + if (!vlv_c0_above(dev_priv, + &dev_priv->rps.down_ei, &now, + VLV_RP_DOWN_EI_THRESHOLD)) + events |= GEN6_PM_RP_DOWN_THRESHOLD; + dev_priv->rps.down_ei = now; + } + + if (pm_iir & GEN6_PM_RP_UP_EI_EXPIRED) { + if (vlv_c0_above(dev_priv, + &dev_priv->rps.up_ei, &now, + VLV_RP_UP_EI_THRESHOLD)) + events |= GEN6_PM_RP_UP_THRESHOLD; + dev_priv->rps.up_ei = now; + } + + return events; +} + +static void gen6_pm_rps_work(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, rps.work); + u32 pm_iir; + int new_delay, adj; + + spin_lock_irq(&dev_priv->irq_lock); + /* Speed up work cancelation during disabling rps interrupts. */ + if (!dev_priv->rps.interrupts_enabled) { + spin_unlock_irq(&dev_priv->irq_lock); + return; + } + pm_iir = dev_priv->rps.pm_iir; + dev_priv->rps.pm_iir = 0; + /* Make sure not to corrupt PMIMR state used by ringbuffer on GEN6 */ + gen6_enable_pm_irq(dev_priv, dev_priv->pm_rps_events); + spin_unlock_irq(&dev_priv->irq_lock); + + /* Make sure we didn't queue anything we're not going to process. */ + WARN_ON(pm_iir & ~dev_priv->pm_rps_events); + + if ((pm_iir & dev_priv->pm_rps_events) == 0) + return; + + mutex_lock(&dev_priv->rps.hw_lock); + + pm_iir |= vlv_wa_c0_ei(dev_priv, pm_iir); + + adj = dev_priv->rps.last_adj; + if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) { + if (adj > 0) + adj *= 2; + else { + /* CHV needs even encode values */ + adj = IS_CHERRYVIEW(dev_priv->dev) ? 2 : 1; + } + new_delay = dev_priv->rps.cur_freq + adj; + + /* + * For better performance, jump directly + * to RPe if we're below it. + */ + if (new_delay < dev_priv->rps.efficient_freq) + new_delay = dev_priv->rps.efficient_freq; + } else if (pm_iir & GEN6_PM_RP_DOWN_TIMEOUT) { + if (dev_priv->rps.cur_freq > dev_priv->rps.efficient_freq) + new_delay = dev_priv->rps.efficient_freq; + else + new_delay = dev_priv->rps.min_freq_softlimit; + adj = 0; + } else if (pm_iir & GEN6_PM_RP_DOWN_THRESHOLD) { + if (adj < 0) + adj *= 2; + else { + /* CHV needs even encode values */ + adj = IS_CHERRYVIEW(dev_priv->dev) ? -2 : -1; + } + new_delay = dev_priv->rps.cur_freq + adj; + } else { /* unknown event */ + new_delay = dev_priv->rps.cur_freq; + } + + /* sysfs frequency interfaces may have snuck in while servicing the + * interrupt + */ + new_delay = clamp_t(int, new_delay, + dev_priv->rps.min_freq_softlimit, + dev_priv->rps.max_freq_softlimit); + + dev_priv->rps.last_adj = new_delay - dev_priv->rps.cur_freq; + + intel_set_rps(dev_priv->dev, new_delay); + + mutex_unlock(&dev_priv->rps.hw_lock); +} + + +/** + * ivybridge_parity_work - Workqueue called when a parity error interrupt + * occurred. + * @work: workqueue struct + * + * Doesn't actually do anything except notify userspace. As a consequence of + * this event, userspace should try to remap the bad rows since statistically + * it is likely the same row is more likely to go bad again. + */ +static void ivybridge_parity_work(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, l3_parity.error_work); + u32 error_status, row, bank, subbank; + char *parity_event[6]; + uint32_t misccpctl; + uint8_t slice = 0; + + /* We must turn off DOP level clock gating to access the L3 registers. + * In order to prevent a get/put style interface, acquire struct mutex + * any time we access those registers. + */ + mutex_lock(&dev_priv->dev->struct_mutex); + + /* If we've screwed up tracking, just let the interrupt fire again */ + if (WARN_ON(!dev_priv->l3_parity.which_slice)) + goto out; + + misccpctl = I915_READ(GEN7_MISCCPCTL); + I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE); + POSTING_READ(GEN7_MISCCPCTL); + + while ((slice = ffs(dev_priv->l3_parity.which_slice)) != 0) { + u32 reg; + + slice--; + if (WARN_ON_ONCE(slice >= NUM_L3_SLICES(dev_priv->dev))) + break; + + dev_priv->l3_parity.which_slice &= ~(1<<slice); + + reg = GEN7_L3CDERRST1 + (slice * 0x200); + + error_status = I915_READ(reg); + row = GEN7_PARITY_ERROR_ROW(error_status); + bank = GEN7_PARITY_ERROR_BANK(error_status); + subbank = GEN7_PARITY_ERROR_SUBBANK(error_status); + + I915_WRITE(reg, GEN7_PARITY_ERROR_VALID | GEN7_L3CDERRST1_ENABLE); + POSTING_READ(reg); + + parity_event[0] = I915_L3_PARITY_UEVENT "=1"; + parity_event[1] = kasprintf(GFP_KERNEL, "ROW=%d", row); + parity_event[2] = kasprintf(GFP_KERNEL, "BANK=%d", bank); + parity_event[3] = kasprintf(GFP_KERNEL, "SUBBANK=%d", subbank); + parity_event[4] = kasprintf(GFP_KERNEL, "SLICE=%d", slice); + parity_event[5] = NULL; + + kobject_uevent_env(&dev_priv->dev->primary->kdev->kobj, + KOBJ_CHANGE, parity_event); + + DRM_DEBUG("Parity error: Slice = %d, Row = %d, Bank = %d, Sub bank = %d.\n", + slice, row, bank, subbank); + + kfree(parity_event[4]); + kfree(parity_event[3]); + kfree(parity_event[2]); + kfree(parity_event[1]); + } + + I915_WRITE(GEN7_MISCCPCTL, misccpctl); + +out: + WARN_ON(dev_priv->l3_parity.which_slice); + spin_lock_irq(&dev_priv->irq_lock); + gen5_enable_gt_irq(dev_priv, GT_PARITY_ERROR(dev_priv->dev)); + spin_unlock_irq(&dev_priv->irq_lock); + + mutex_unlock(&dev_priv->dev->struct_mutex); +} + +static void ivybridge_parity_error_irq_handler(struct drm_device *dev, u32 iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (!HAS_L3_DPF(dev)) + return; + + spin_lock(&dev_priv->irq_lock); + gen5_disable_gt_irq(dev_priv, GT_PARITY_ERROR(dev)); + spin_unlock(&dev_priv->irq_lock); + + iir &= GT_PARITY_ERROR(dev); + if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT_S1) + dev_priv->l3_parity.which_slice |= 1 << 1; + + if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT) + dev_priv->l3_parity.which_slice |= 1 << 0; + + queue_work(dev_priv->wq, &dev_priv->l3_parity.error_work); +} + +static void ilk_gt_irq_handler(struct drm_device *dev, + struct drm_i915_private *dev_priv, + u32 gt_iir) +{ + if (gt_iir & + (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT)) + notify_ring(dev, &dev_priv->ring[RCS]); + if (gt_iir & ILK_BSD_USER_INTERRUPT) + notify_ring(dev, &dev_priv->ring[VCS]); +} + +static void snb_gt_irq_handler(struct drm_device *dev, + struct drm_i915_private *dev_priv, + u32 gt_iir) +{ + + if (gt_iir & + (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT)) + notify_ring(dev, &dev_priv->ring[RCS]); + if (gt_iir & GT_BSD_USER_INTERRUPT) + notify_ring(dev, &dev_priv->ring[VCS]); + if (gt_iir & GT_BLT_USER_INTERRUPT) + notify_ring(dev, &dev_priv->ring[BCS]); + + if (gt_iir & (GT_BLT_CS_ERROR_INTERRUPT | + GT_BSD_CS_ERROR_INTERRUPT | + GT_RENDER_CS_MASTER_ERROR_INTERRUPT)) + DRM_DEBUG("Command parser error, gt_iir 0x%08x\n", gt_iir); + + if (gt_iir & GT_PARITY_ERROR(dev)) + ivybridge_parity_error_irq_handler(dev, gt_iir); +} + +static irqreturn_t gen8_gt_irq_handler(struct drm_device *dev, + struct drm_i915_private *dev_priv, + u32 master_ctl) +{ + struct intel_engine_cs *ring; + u32 rcs, bcs, vcs; + uint32_t tmp = 0; + irqreturn_t ret = IRQ_NONE; + + if (master_ctl & (GEN8_GT_RCS_IRQ | GEN8_GT_BCS_IRQ)) { + tmp = I915_READ(GEN8_GT_IIR(0)); + if (tmp) { + I915_WRITE(GEN8_GT_IIR(0), tmp); + ret = IRQ_HANDLED; + + rcs = tmp >> GEN8_RCS_IRQ_SHIFT; + ring = &dev_priv->ring[RCS]; + if (rcs & GT_RENDER_USER_INTERRUPT) + notify_ring(dev, ring); + if (rcs & GT_CONTEXT_SWITCH_INTERRUPT) + intel_lrc_irq_handler(ring); + + bcs = tmp >> GEN8_BCS_IRQ_SHIFT; + ring = &dev_priv->ring[BCS]; + if (bcs & GT_RENDER_USER_INTERRUPT) + notify_ring(dev, ring); + if (bcs & GT_CONTEXT_SWITCH_INTERRUPT) + intel_lrc_irq_handler(ring); + } else + DRM_ERROR("The master control interrupt lied (GT0)!\n"); + } + + if (master_ctl & (GEN8_GT_VCS1_IRQ | GEN8_GT_VCS2_IRQ)) { + tmp = I915_READ(GEN8_GT_IIR(1)); + if (tmp) { + I915_WRITE(GEN8_GT_IIR(1), tmp); + ret = IRQ_HANDLED; + + vcs = tmp >> GEN8_VCS1_IRQ_SHIFT; + ring = &dev_priv->ring[VCS]; + if (vcs & GT_RENDER_USER_INTERRUPT) + notify_ring(dev, ring); + if (vcs & GT_CONTEXT_SWITCH_INTERRUPT) + intel_lrc_irq_handler(ring); + + vcs = tmp >> GEN8_VCS2_IRQ_SHIFT; + ring = &dev_priv->ring[VCS2]; + if (vcs & GT_RENDER_USER_INTERRUPT) + notify_ring(dev, ring); + if (vcs & GT_CONTEXT_SWITCH_INTERRUPT) + intel_lrc_irq_handler(ring); + } else + DRM_ERROR("The master control interrupt lied (GT1)!\n"); + } + + if (master_ctl & GEN8_GT_PM_IRQ) { + tmp = I915_READ(GEN8_GT_IIR(2)); + if (tmp & dev_priv->pm_rps_events) { + I915_WRITE(GEN8_GT_IIR(2), + tmp & dev_priv->pm_rps_events); + ret = IRQ_HANDLED; + gen6_rps_irq_handler(dev_priv, tmp); + } else + DRM_ERROR("The master control interrupt lied (PM)!\n"); + } + + if (master_ctl & GEN8_GT_VECS_IRQ) { + tmp = I915_READ(GEN8_GT_IIR(3)); + if (tmp) { + I915_WRITE(GEN8_GT_IIR(3), tmp); + ret = IRQ_HANDLED; + + vcs = tmp >> GEN8_VECS_IRQ_SHIFT; + ring = &dev_priv->ring[VECS]; + if (vcs & GT_RENDER_USER_INTERRUPT) + notify_ring(dev, ring); + if (vcs & GT_CONTEXT_SWITCH_INTERRUPT) + intel_lrc_irq_handler(ring); + } else + DRM_ERROR("The master control interrupt lied (GT3)!\n"); + } + + return ret; +} + +#define HPD_STORM_DETECT_PERIOD 1000 +#define HPD_STORM_THRESHOLD 5 + +static int pch_port_to_hotplug_shift(enum port port) +{ + switch (port) { + case PORT_A: + case PORT_E: + default: + return -1; + case PORT_B: + return 0; + case PORT_C: + return 8; + case PORT_D: + return 16; + } +} + +static int i915_port_to_hotplug_shift(enum port port) +{ + switch (port) { + case PORT_A: + case PORT_E: + default: + return -1; + case PORT_B: + return 17; + case PORT_C: + return 19; + case PORT_D: + return 21; + } +} + +static inline enum port get_port_from_pin(enum hpd_pin pin) +{ + switch (pin) { + case HPD_PORT_B: + return PORT_B; + case HPD_PORT_C: + return PORT_C; + case HPD_PORT_D: + return PORT_D; + default: + return PORT_A; /* no hpd */ + } +} + +static inline void intel_hpd_irq_handler(struct drm_device *dev, + u32 hotplug_trigger, + u32 dig_hotplug_reg, + const u32 hpd[HPD_NUM_PINS]) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int i; + enum port port; + bool storm_detected = false; + bool queue_dig = false, queue_hp = false; + u32 dig_shift; + u32 dig_port_mask = 0; + + if (!hotplug_trigger) + return; + + DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x, dig 0x%08x\n", + hotplug_trigger, dig_hotplug_reg); + + spin_lock(&dev_priv->irq_lock); + for (i = 1; i < HPD_NUM_PINS; i++) { + if (!(hpd[i] & hotplug_trigger)) + continue; + + port = get_port_from_pin(i); + if (port && dev_priv->hpd_irq_port[port]) { + bool long_hpd; + + if (HAS_PCH_SPLIT(dev)) { + dig_shift = pch_port_to_hotplug_shift(port); + long_hpd = (dig_hotplug_reg >> dig_shift) & PORTB_HOTPLUG_LONG_DETECT; + } else { + dig_shift = i915_port_to_hotplug_shift(port); + long_hpd = (hotplug_trigger >> dig_shift) & PORTB_HOTPLUG_LONG_DETECT; + } + + DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", + port_name(port), + long_hpd ? "long" : "short"); + /* for long HPD pulses we want to have the digital queue happen, + but we still want HPD storm detection to function. */ + if (long_hpd) { + dev_priv->long_hpd_port_mask |= (1 << port); + dig_port_mask |= hpd[i]; + } else { + /* for short HPD just trigger the digital queue */ + dev_priv->short_hpd_port_mask |= (1 << port); + hotplug_trigger &= ~hpd[i]; + } + queue_dig = true; + } + } + + for (i = 1; i < HPD_NUM_PINS; i++) { + if (hpd[i] & hotplug_trigger && + dev_priv->hpd_stats[i].hpd_mark == HPD_DISABLED) { + /* + * On GMCH platforms the interrupt mask bits only + * prevent irq generation, not the setting of the + * hotplug bits itself. So only WARN about unexpected + * interrupts on saner platforms. + */ + WARN_ONCE(INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev), + "Received HPD interrupt (0x%08x) on pin %d (0x%08x) although disabled\n", + hotplug_trigger, i, hpd[i]); + + continue; + } + + if (!(hpd[i] & hotplug_trigger) || + dev_priv->hpd_stats[i].hpd_mark != HPD_ENABLED) + continue; + + if (!(dig_port_mask & hpd[i])) { + dev_priv->hpd_event_bits |= (1 << i); + queue_hp = true; + } + + if (!time_in_range(jiffies, dev_priv->hpd_stats[i].hpd_last_jiffies, + dev_priv->hpd_stats[i].hpd_last_jiffies + + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD))) { + dev_priv->hpd_stats[i].hpd_last_jiffies = jiffies; + dev_priv->hpd_stats[i].hpd_cnt = 0; + DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", i); + } else if (dev_priv->hpd_stats[i].hpd_cnt > HPD_STORM_THRESHOLD) { + dev_priv->hpd_stats[i].hpd_mark = HPD_MARK_DISABLED; + dev_priv->hpd_event_bits &= ~(1 << i); + DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", i); + storm_detected = true; + } else { + dev_priv->hpd_stats[i].hpd_cnt++; + DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", i, + dev_priv->hpd_stats[i].hpd_cnt); + } + } + + if (storm_detected) + dev_priv->display.hpd_irq_setup(dev); + spin_unlock(&dev_priv->irq_lock); + + /* + * Our hotplug handler can grab modeset locks (by calling down into the + * fb helpers). Hence it must not be run on our own dev-priv->wq work + * queue for otherwise the flush_work in the pageflip code will + * deadlock. + */ + if (queue_dig) + queue_work(dev_priv->dp_wq, &dev_priv->dig_port_work); + if (queue_hp) + schedule_work(&dev_priv->hotplug_work); +} + +static void gmbus_irq_handler(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + wake_up_all(&dev_priv->gmbus_wait_queue); +} + +static void dp_aux_irq_handler(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + wake_up_all(&dev_priv->gmbus_wait_queue); +} + +#if defined(CONFIG_DEBUG_FS) +static void display_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe, + uint32_t crc0, uint32_t crc1, + uint32_t crc2, uint32_t crc3, + uint32_t crc4) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe]; + struct intel_pipe_crc_entry *entry; + int head, tail; + + spin_lock(&pipe_crc->lock); + + if (!pipe_crc->entries) { + spin_unlock(&pipe_crc->lock); + DRM_DEBUG_KMS("spurious interrupt\n"); + return; + } + + head = pipe_crc->head; + tail = pipe_crc->tail; + + if (CIRC_SPACE(head, tail, INTEL_PIPE_CRC_ENTRIES_NR) < 1) { + spin_unlock(&pipe_crc->lock); + DRM_ERROR("CRC buffer overflowing\n"); + return; + } + + entry = &pipe_crc->entries[head]; + + entry->frame = dev->driver->get_vblank_counter(dev, pipe); + entry->crc[0] = crc0; + entry->crc[1] = crc1; + entry->crc[2] = crc2; + entry->crc[3] = crc3; + entry->crc[4] = crc4; + + head = (head + 1) & (INTEL_PIPE_CRC_ENTRIES_NR - 1); + pipe_crc->head = head; + + spin_unlock(&pipe_crc->lock); + + wake_up_interruptible(&pipe_crc->wq); +} +#else +static inline void +display_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe, + uint32_t crc0, uint32_t crc1, + uint32_t crc2, uint32_t crc3, + uint32_t crc4) {} +#endif + + +static void hsw_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + display_pipe_crc_irq_handler(dev, pipe, + I915_READ(PIPE_CRC_RES_1_IVB(pipe)), + 0, 0, 0, 0); +} + +static void ivb_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + display_pipe_crc_irq_handler(dev, pipe, + I915_READ(PIPE_CRC_RES_1_IVB(pipe)), + I915_READ(PIPE_CRC_RES_2_IVB(pipe)), + I915_READ(PIPE_CRC_RES_3_IVB(pipe)), + I915_READ(PIPE_CRC_RES_4_IVB(pipe)), + I915_READ(PIPE_CRC_RES_5_IVB(pipe))); +} + +static void i9xx_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t res1, res2; + + if (INTEL_INFO(dev)->gen >= 3) + res1 = I915_READ(PIPE_CRC_RES_RES1_I915(pipe)); + else + res1 = 0; + + if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev)) + res2 = I915_READ(PIPE_CRC_RES_RES2_G4X(pipe)); + else + res2 = 0; + + display_pipe_crc_irq_handler(dev, pipe, + I915_READ(PIPE_CRC_RES_RED(pipe)), + I915_READ(PIPE_CRC_RES_GREEN(pipe)), + I915_READ(PIPE_CRC_RES_BLUE(pipe)), + res1, res2); +} + +/* The RPS events need forcewake, so we add them to a work queue and mask their + * IMR bits until the work is done. Other interrupts can be processed without + * the work queue. */ +static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir) +{ + if (pm_iir & dev_priv->pm_rps_events) { + spin_lock(&dev_priv->irq_lock); + gen6_disable_pm_irq(dev_priv, pm_iir & dev_priv->pm_rps_events); + if (dev_priv->rps.interrupts_enabled) { + dev_priv->rps.pm_iir |= pm_iir & dev_priv->pm_rps_events; + queue_work(dev_priv->wq, &dev_priv->rps.work); + } + spin_unlock(&dev_priv->irq_lock); + } + + if (INTEL_INFO(dev_priv)->gen >= 8) + return; + + if (HAS_VEBOX(dev_priv->dev)) { + if (pm_iir & PM_VEBOX_USER_INTERRUPT) + notify_ring(dev_priv->dev, &dev_priv->ring[VECS]); + + if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) + DRM_DEBUG("Command parser error, pm_iir 0x%08x\n", pm_iir); + } +} + +static bool intel_pipe_handle_vblank(struct drm_device *dev, enum pipe pipe) +{ + if (!drm_handle_vblank(dev, pipe)) + return false; + + return true; +} + +static void valleyview_pipestat_irq_handler(struct drm_device *dev, u32 iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pipe_stats[I915_MAX_PIPES] = { }; + int pipe; + + spin_lock(&dev_priv->irq_lock); + for_each_pipe(dev_priv, pipe) { + int reg; + u32 mask, iir_bit = 0; + + /* + * PIPESTAT bits get signalled even when the interrupt is + * disabled with the mask bits, and some of the status bits do + * not generate interrupts at all (like the underrun bit). Hence + * we need to be careful that we only handle what we want to + * handle. + */ + + /* fifo underruns are filterered in the underrun handler. */ + mask = PIPE_FIFO_UNDERRUN_STATUS; + + switch (pipe) { + case PIPE_A: + iir_bit = I915_DISPLAY_PIPE_A_EVENT_INTERRUPT; + break; + case PIPE_B: + iir_bit = I915_DISPLAY_PIPE_B_EVENT_INTERRUPT; + break; + case PIPE_C: + iir_bit = I915_DISPLAY_PIPE_C_EVENT_INTERRUPT; + break; + } + if (iir & iir_bit) + mask |= dev_priv->pipestat_irq_mask[pipe]; + + if (!mask) + continue; + + reg = PIPESTAT(pipe); + mask |= PIPESTAT_INT_ENABLE_MASK; + pipe_stats[pipe] = I915_READ(reg) & mask; + + /* + * Clear the PIPE*STAT regs before the IIR + */ + if (pipe_stats[pipe] & (PIPE_FIFO_UNDERRUN_STATUS | + PIPESTAT_INT_STATUS_MASK)) + I915_WRITE(reg, pipe_stats[pipe]); + } + spin_unlock(&dev_priv->irq_lock); + + for_each_pipe(dev_priv, pipe) { + if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS && + intel_pipe_handle_vblank(dev, pipe)) + intel_check_page_flip(dev, pipe); + + if (pipe_stats[pipe] & PLANE_FLIP_DONE_INT_STATUS_VLV) { + intel_prepare_page_flip(dev, pipe); + intel_finish_page_flip(dev, pipe); + } + + if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS) + i9xx_pipe_crc_irq_handler(dev, pipe); + + if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS) + intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe); + } + + if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS) + gmbus_irq_handler(dev); +} + +static void i9xx_hpd_irq_handler(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT); + + if (hotplug_status) { + I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status); + /* + * Make sure hotplug status is cleared before we clear IIR, or else we + * may miss hotplug events. + */ + POSTING_READ(PORT_HOTPLUG_STAT); + + if (IS_G4X(dev)) { + u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_G4X; + + intel_hpd_irq_handler(dev, hotplug_trigger, 0, hpd_status_g4x); + } else { + u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915; + + intel_hpd_irq_handler(dev, hotplug_trigger, 0, hpd_status_i915); + } + + if ((IS_G4X(dev) || IS_VALLEYVIEW(dev)) && + hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X) + dp_aux_irq_handler(dev); + } +} + +static irqreturn_t valleyview_irq_handler(int irq, void *arg) +{ + struct drm_device *dev = arg; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 iir, gt_iir, pm_iir; + irqreturn_t ret = IRQ_NONE; + + if (!intel_irqs_enabled(dev_priv)) + return IRQ_NONE; + + while (true) { + /* Find, clear, then process each source of interrupt */ + + gt_iir = I915_READ(GTIIR); + if (gt_iir) + I915_WRITE(GTIIR, gt_iir); + + pm_iir = I915_READ(GEN6_PMIIR); + if (pm_iir) + I915_WRITE(GEN6_PMIIR, pm_iir); + + iir = I915_READ(VLV_IIR); + if (iir) { + /* Consume port before clearing IIR or we'll miss events */ + if (iir & I915_DISPLAY_PORT_INTERRUPT) + i9xx_hpd_irq_handler(dev); + I915_WRITE(VLV_IIR, iir); + } + + if (gt_iir == 0 && pm_iir == 0 && iir == 0) + goto out; + + ret = IRQ_HANDLED; + + if (gt_iir) + snb_gt_irq_handler(dev, dev_priv, gt_iir); + if (pm_iir) + gen6_rps_irq_handler(dev_priv, pm_iir); + /* Call regardless, as some status bits might not be + * signalled in iir */ + valleyview_pipestat_irq_handler(dev, iir); + } + +out: + return ret; +} + +static irqreturn_t cherryview_irq_handler(int irq, void *arg) +{ + struct drm_device *dev = arg; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 master_ctl, iir; + irqreturn_t ret = IRQ_NONE; + + if (!intel_irqs_enabled(dev_priv)) + return IRQ_NONE; + + for (;;) { + master_ctl = I915_READ(GEN8_MASTER_IRQ) & ~GEN8_MASTER_IRQ_CONTROL; + iir = I915_READ(VLV_IIR); + + if (master_ctl == 0 && iir == 0) + break; + + ret = IRQ_HANDLED; + + I915_WRITE(GEN8_MASTER_IRQ, 0); + + /* Find, clear, then process each source of interrupt */ + + if (iir) { + /* Consume port before clearing IIR or we'll miss events */ + if (iir & I915_DISPLAY_PORT_INTERRUPT) + i9xx_hpd_irq_handler(dev); + I915_WRITE(VLV_IIR, iir); + } + + gen8_gt_irq_handler(dev, dev_priv, master_ctl); + + /* Call regardless, as some status bits might not be + * signalled in iir */ + valleyview_pipestat_irq_handler(dev, iir); + + I915_WRITE(GEN8_MASTER_IRQ, DE_MASTER_IRQ_CONTROL); + POSTING_READ(GEN8_MASTER_IRQ); + } + + return ret; +} + +static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK; + u32 dig_hotplug_reg; + + dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG); + I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg); + + intel_hpd_irq_handler(dev, hotplug_trigger, dig_hotplug_reg, hpd_ibx); + + if (pch_iir & SDE_AUDIO_POWER_MASK) { + int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >> + SDE_AUDIO_POWER_SHIFT); + DRM_DEBUG_DRIVER("PCH audio power change on port %d\n", + port_name(port)); + } + + if (pch_iir & SDE_AUX_MASK) + dp_aux_irq_handler(dev); + + if (pch_iir & SDE_GMBUS) + gmbus_irq_handler(dev); + + if (pch_iir & SDE_AUDIO_HDCP_MASK) + DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n"); + + if (pch_iir & SDE_AUDIO_TRANS_MASK) + DRM_DEBUG_DRIVER("PCH transcoder audio interrupt\n"); + + if (pch_iir & SDE_POISON) + DRM_ERROR("PCH poison interrupt\n"); + + if (pch_iir & SDE_FDI_MASK) + for_each_pipe(dev_priv, pipe) + DRM_DEBUG_DRIVER(" pipe %c FDI IIR: 0x%08x\n", + pipe_name(pipe), + I915_READ(FDI_RX_IIR(pipe))); + + if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE)) + DRM_DEBUG_DRIVER("PCH transcoder CRC done interrupt\n"); + + if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR)) + DRM_DEBUG_DRIVER("PCH transcoder CRC error interrupt\n"); + + if (pch_iir & SDE_TRANSA_FIFO_UNDER) + intel_pch_fifo_underrun_irq_handler(dev_priv, TRANSCODER_A); + + if (pch_iir & SDE_TRANSB_FIFO_UNDER) + intel_pch_fifo_underrun_irq_handler(dev_priv, TRANSCODER_B); +} + +static void ivb_err_int_handler(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 err_int = I915_READ(GEN7_ERR_INT); + enum pipe pipe; + + if (err_int & ERR_INT_POISON) + DRM_ERROR("Poison interrupt\n"); + + for_each_pipe(dev_priv, pipe) { + if (err_int & ERR_INT_FIFO_UNDERRUN(pipe)) + intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe); + + if (err_int & ERR_INT_PIPE_CRC_DONE(pipe)) { + if (IS_IVYBRIDGE(dev)) + ivb_pipe_crc_irq_handler(dev, pipe); + else + hsw_pipe_crc_irq_handler(dev, pipe); + } + } + + I915_WRITE(GEN7_ERR_INT, err_int); +} + +static void cpt_serr_int_handler(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 serr_int = I915_READ(SERR_INT); + + if (serr_int & SERR_INT_POISON) + DRM_ERROR("PCH poison interrupt\n"); + + if (serr_int & SERR_INT_TRANS_A_FIFO_UNDERRUN) + intel_pch_fifo_underrun_irq_handler(dev_priv, TRANSCODER_A); + + if (serr_int & SERR_INT_TRANS_B_FIFO_UNDERRUN) + intel_pch_fifo_underrun_irq_handler(dev_priv, TRANSCODER_B); + + if (serr_int & SERR_INT_TRANS_C_FIFO_UNDERRUN) + intel_pch_fifo_underrun_irq_handler(dev_priv, TRANSCODER_C); + + I915_WRITE(SERR_INT, serr_int); +} + +static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT; + u32 dig_hotplug_reg; + + dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG); + I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg); + + intel_hpd_irq_handler(dev, hotplug_trigger, dig_hotplug_reg, hpd_cpt); + + if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) { + int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >> + SDE_AUDIO_POWER_SHIFT_CPT); + DRM_DEBUG_DRIVER("PCH audio power change on port %c\n", + port_name(port)); + } + + if (pch_iir & SDE_AUX_MASK_CPT) + dp_aux_irq_handler(dev); + + if (pch_iir & SDE_GMBUS_CPT) + gmbus_irq_handler(dev); + + if (pch_iir & SDE_AUDIO_CP_REQ_CPT) + DRM_DEBUG_DRIVER("Audio CP request interrupt\n"); + + if (pch_iir & SDE_AUDIO_CP_CHG_CPT) + DRM_DEBUG_DRIVER("Audio CP change interrupt\n"); + + if (pch_iir & SDE_FDI_MASK_CPT) + for_each_pipe(dev_priv, pipe) + DRM_DEBUG_DRIVER(" pipe %c FDI IIR: 0x%08x\n", + pipe_name(pipe), + I915_READ(FDI_RX_IIR(pipe))); + + if (pch_iir & SDE_ERROR_CPT) + cpt_serr_int_handler(dev); +} + +static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + enum pipe pipe; + + if (de_iir & DE_AUX_CHANNEL_A) + dp_aux_irq_handler(dev); + + if (de_iir & DE_GSE) + intel_opregion_asle_intr(dev); + + if (de_iir & DE_POISON) + DRM_ERROR("Poison interrupt\n"); + + for_each_pipe(dev_priv, pipe) { + if (de_iir & DE_PIPE_VBLANK(pipe) && + intel_pipe_handle_vblank(dev, pipe)) + intel_check_page_flip(dev, pipe); + + if (de_iir & DE_PIPE_FIFO_UNDERRUN(pipe)) + intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe); + + if (de_iir & DE_PIPE_CRC_DONE(pipe)) + i9xx_pipe_crc_irq_handler(dev, pipe); + + /* plane/pipes map 1:1 on ilk+ */ + if (de_iir & DE_PLANE_FLIP_DONE(pipe)) { + intel_prepare_page_flip(dev, pipe); + intel_finish_page_flip_plane(dev, pipe); + } + } + + /* check event from PCH */ + if (de_iir & DE_PCH_EVENT) { + u32 pch_iir = I915_READ(SDEIIR); + + if (HAS_PCH_CPT(dev)) + cpt_irq_handler(dev, pch_iir); + else + ibx_irq_handler(dev, pch_iir); + + /* should clear PCH hotplug event before clear CPU irq */ + I915_WRITE(SDEIIR, pch_iir); + } + + if (IS_GEN5(dev) && de_iir & DE_PCU_EVENT) + ironlake_rps_change_irq_handler(dev); +} + +static void ivb_display_irq_handler(struct drm_device *dev, u32 de_iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + enum pipe pipe; + + if (de_iir & DE_ERR_INT_IVB) + ivb_err_int_handler(dev); + + if (de_iir & DE_AUX_CHANNEL_A_IVB) + dp_aux_irq_handler(dev); + + if (de_iir & DE_GSE_IVB) + intel_opregion_asle_intr(dev); + + for_each_pipe(dev_priv, pipe) { + if (de_iir & (DE_PIPE_VBLANK_IVB(pipe)) && + intel_pipe_handle_vblank(dev, pipe)) + intel_check_page_flip(dev, pipe); + + /* plane/pipes map 1:1 on ilk+ */ + if (de_iir & DE_PLANE_FLIP_DONE_IVB(pipe)) { + intel_prepare_page_flip(dev, pipe); + intel_finish_page_flip_plane(dev, pipe); + } + } + + /* check event from PCH */ + if (!HAS_PCH_NOP(dev) && (de_iir & DE_PCH_EVENT_IVB)) { + u32 pch_iir = I915_READ(SDEIIR); + + cpt_irq_handler(dev, pch_iir); + + /* clear PCH hotplug event before clear CPU irq */ + I915_WRITE(SDEIIR, pch_iir); + } +} + +/* + * To handle irqs with the minimum potential races with fresh interrupts, we: + * 1 - Disable Master Interrupt Control. + * 2 - Find the source(s) of the interrupt. + * 3 - Clear the Interrupt Identity bits (IIR). + * 4 - Process the interrupt(s) that had bits set in the IIRs. + * 5 - Re-enable Master Interrupt Control. + */ +static irqreturn_t ironlake_irq_handler(int irq, void *arg) +{ + struct drm_device *dev = arg; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 de_iir, gt_iir, de_ier, sde_ier = 0; + irqreturn_t ret = IRQ_NONE; + + if (!intel_irqs_enabled(dev_priv)) + return IRQ_NONE; + + /* We get interrupts on unclaimed registers, so check for this before we + * do any I915_{READ,WRITE}. */ + intel_uncore_check_errors(dev); + + /* disable master interrupt before clearing iir */ + de_ier = I915_READ(DEIER); + I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL); + POSTING_READ(DEIER); + + /* Disable south interrupts. We'll only write to SDEIIR once, so further + * interrupts will will be stored on its back queue, and then we'll be + * able to process them after we restore SDEIER (as soon as we restore + * it, we'll get an interrupt if SDEIIR still has something to process + * due to its back queue). */ + if (!HAS_PCH_NOP(dev)) { + sde_ier = I915_READ(SDEIER); + I915_WRITE(SDEIER, 0); + POSTING_READ(SDEIER); + } + + /* Find, clear, then process each source of interrupt */ + + gt_iir = I915_READ(GTIIR); + if (gt_iir) { + I915_WRITE(GTIIR, gt_iir); + ret = IRQ_HANDLED; + if (INTEL_INFO(dev)->gen >= 6) + snb_gt_irq_handler(dev, dev_priv, gt_iir); + else + ilk_gt_irq_handler(dev, dev_priv, gt_iir); + } + + de_iir = I915_READ(DEIIR); + if (de_iir) { + I915_WRITE(DEIIR, de_iir); + ret = IRQ_HANDLED; + if (INTEL_INFO(dev)->gen >= 7) + ivb_display_irq_handler(dev, de_iir); + else + ilk_display_irq_handler(dev, de_iir); + } + + if (INTEL_INFO(dev)->gen >= 6) { + u32 pm_iir = I915_READ(GEN6_PMIIR); + if (pm_iir) { + I915_WRITE(GEN6_PMIIR, pm_iir); + ret = IRQ_HANDLED; + gen6_rps_irq_handler(dev_priv, pm_iir); + } + } + + I915_WRITE(DEIER, de_ier); + POSTING_READ(DEIER); + if (!HAS_PCH_NOP(dev)) { + I915_WRITE(SDEIER, sde_ier); + POSTING_READ(SDEIER); + } + + return ret; +} + +static irqreturn_t gen8_irq_handler(int irq, void *arg) +{ + struct drm_device *dev = arg; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 master_ctl; + irqreturn_t ret = IRQ_NONE; + uint32_t tmp = 0; + enum pipe pipe; + u32 aux_mask = GEN8_AUX_CHANNEL_A; + + if (!intel_irqs_enabled(dev_priv)) + return IRQ_NONE; + + if (IS_GEN9(dev)) + aux_mask |= GEN9_AUX_CHANNEL_B | GEN9_AUX_CHANNEL_C | + GEN9_AUX_CHANNEL_D; + + master_ctl = I915_READ(GEN8_MASTER_IRQ); + master_ctl &= ~GEN8_MASTER_IRQ_CONTROL; + if (!master_ctl) + return IRQ_NONE; + + I915_WRITE(GEN8_MASTER_IRQ, 0); + POSTING_READ(GEN8_MASTER_IRQ); + + /* Find, clear, then process each source of interrupt */ + + ret = gen8_gt_irq_handler(dev, dev_priv, master_ctl); + + if (master_ctl & GEN8_DE_MISC_IRQ) { + tmp = I915_READ(GEN8_DE_MISC_IIR); + if (tmp) { + I915_WRITE(GEN8_DE_MISC_IIR, tmp); + ret = IRQ_HANDLED; + if (tmp & GEN8_DE_MISC_GSE) + intel_opregion_asle_intr(dev); + else + DRM_ERROR("Unexpected DE Misc interrupt\n"); + } + else + DRM_ERROR("The master control interrupt lied (DE MISC)!\n"); + } + + if (master_ctl & GEN8_DE_PORT_IRQ) { + tmp = I915_READ(GEN8_DE_PORT_IIR); + if (tmp) { + I915_WRITE(GEN8_DE_PORT_IIR, tmp); + ret = IRQ_HANDLED; + + if (tmp & aux_mask) + dp_aux_irq_handler(dev); + else + DRM_ERROR("Unexpected DE Port interrupt\n"); + } + else + DRM_ERROR("The master control interrupt lied (DE PORT)!\n"); + } + + for_each_pipe(dev_priv, pipe) { + uint32_t pipe_iir, flip_done = 0, fault_errors = 0; + + if (!(master_ctl & GEN8_DE_PIPE_IRQ(pipe))) + continue; + + pipe_iir = I915_READ(GEN8_DE_PIPE_IIR(pipe)); + if (pipe_iir) { + ret = IRQ_HANDLED; + I915_WRITE(GEN8_DE_PIPE_IIR(pipe), pipe_iir); + + if (pipe_iir & GEN8_PIPE_VBLANK && + intel_pipe_handle_vblank(dev, pipe)) + intel_check_page_flip(dev, pipe); + + if (IS_GEN9(dev)) + flip_done = pipe_iir & GEN9_PIPE_PLANE1_FLIP_DONE; + else + flip_done = pipe_iir & GEN8_PIPE_PRIMARY_FLIP_DONE; + + if (flip_done) { + intel_prepare_page_flip(dev, pipe); + intel_finish_page_flip_plane(dev, pipe); + } + + if (pipe_iir & GEN8_PIPE_CDCLK_CRC_DONE) + hsw_pipe_crc_irq_handler(dev, pipe); + + if (pipe_iir & GEN8_PIPE_FIFO_UNDERRUN) + intel_cpu_fifo_underrun_irq_handler(dev_priv, + pipe); + + + if (IS_GEN9(dev)) + fault_errors = pipe_iir & GEN9_DE_PIPE_IRQ_FAULT_ERRORS; + else + fault_errors = pipe_iir & GEN8_DE_PIPE_IRQ_FAULT_ERRORS; + + if (fault_errors) + DRM_ERROR("Fault errors on pipe %c\n: 0x%08x", + pipe_name(pipe), + pipe_iir & GEN8_DE_PIPE_IRQ_FAULT_ERRORS); + } else + DRM_ERROR("The master control interrupt lied (DE PIPE)!\n"); + } + + if (!HAS_PCH_NOP(dev) && master_ctl & GEN8_DE_PCH_IRQ) { + /* + * FIXME(BDW): Assume for now that the new interrupt handling + * scheme also closed the SDE interrupt handling race we've seen + * on older pch-split platforms. But this needs testing. + */ + u32 pch_iir = I915_READ(SDEIIR); + if (pch_iir) { + I915_WRITE(SDEIIR, pch_iir); + ret = IRQ_HANDLED; + cpt_irq_handler(dev, pch_iir); + } else + DRM_ERROR("The master control interrupt lied (SDE)!\n"); + + } + + I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL); + POSTING_READ(GEN8_MASTER_IRQ); + + return ret; +} + +static void i915_error_wake_up(struct drm_i915_private *dev_priv, + bool reset_completed) +{ + struct intel_engine_cs *ring; + int i; + + /* + * Notify all waiters for GPU completion events that reset state has + * been changed, and that they need to restart their wait after + * checking for potential errors (and bail out to drop locks if there is + * a gpu reset pending so that i915_error_work_func can acquire them). + */ + + /* Wake up __wait_seqno, potentially holding dev->struct_mutex. */ + for_each_ring(ring, dev_priv, i) + wake_up_all(&ring->irq_queue); + + /* Wake up intel_crtc_wait_for_pending_flips, holding crtc->mutex. */ + wake_up_all(&dev_priv->pending_flip_queue); + + /* + * Signal tasks blocked in i915_gem_wait_for_error that the pending + * reset state is cleared. + */ + if (reset_completed) + wake_up_all(&dev_priv->gpu_error.reset_queue); +} + +/** + * i915_reset_and_wakeup - do process context error handling work + * + * Fire an error uevent so userspace can see that a hang or error + * was detected. + */ +static void i915_reset_and_wakeup(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = to_i915(dev); + struct i915_gpu_error *error = &dev_priv->gpu_error; + char *error_event[] = { I915_ERROR_UEVENT "=1", NULL }; + char *reset_event[] = { I915_RESET_UEVENT "=1", NULL }; + char *reset_done_event[] = { I915_ERROR_UEVENT "=0", NULL }; + int ret; + + kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, error_event); + + /* + * Note that there's only one work item which does gpu resets, so we + * need not worry about concurrent gpu resets potentially incrementing + * error->reset_counter twice. We only need to take care of another + * racing irq/hangcheck declaring the gpu dead for a second time. A + * quick check for that is good enough: schedule_work ensures the + * correct ordering between hang detection and this work item, and since + * the reset in-progress bit is only ever set by code outside of this + * work we don't need to worry about any other races. + */ + if (i915_reset_in_progress(error) && !i915_terminally_wedged(error)) { + DRM_DEBUG_DRIVER("resetting chip\n"); + kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, + reset_event); + + /* + * In most cases it's guaranteed that we get here with an RPM + * reference held, for example because there is a pending GPU + * request that won't finish until the reset is done. This + * isn't the case at least when we get here by doing a + * simulated reset via debugs, so get an RPM reference. + */ + intel_runtime_pm_get(dev_priv); + + intel_prepare_reset(dev); + + /* + * All state reset _must_ be completed before we update the + * reset counter, for otherwise waiters might miss the reset + * pending state and not properly drop locks, resulting in + * deadlocks with the reset work. + */ + ret = i915_reset(dev); + + intel_finish_reset(dev); + + intel_runtime_pm_put(dev_priv); + + if (ret == 0) { + /* + * After all the gem state is reset, increment the reset + * counter and wake up everyone waiting for the reset to + * complete. + * + * Since unlock operations are a one-sided barrier only, + * we need to insert a barrier here to order any seqno + * updates before + * the counter increment. + */ + smp_mb__before_atomic(); + atomic_inc(&dev_priv->gpu_error.reset_counter); + + kobject_uevent_env(&dev->primary->kdev->kobj, + KOBJ_CHANGE, reset_done_event); + } else { + atomic_set_mask(I915_WEDGED, &error->reset_counter); + } + + /* + * Note: The wake_up also serves as a memory barrier so that + * waiters see the update value of the reset counter atomic_t. + */ + i915_error_wake_up(dev_priv, true); + } +} + +static void i915_report_and_clear_eir(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t instdone[I915_NUM_INSTDONE_REG]; + u32 eir = I915_READ(EIR); + int pipe, i; + + if (!eir) + return; + + pr_err("render error detected, EIR: 0x%08x\n", eir); + + i915_get_extra_instdone(dev, instdone); + + if (IS_G4X(dev)) { + if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) { + u32 ipeir = I915_READ(IPEIR_I965); + + pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR_I965)); + pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR_I965)); + for (i = 0; i < ARRAY_SIZE(instdone); i++) + pr_err(" INSTDONE_%d: 0x%08x\n", i, instdone[i]); + pr_err(" INSTPS: 0x%08x\n", I915_READ(INSTPS)); + pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD_I965)); + I915_WRITE(IPEIR_I965, ipeir); + POSTING_READ(IPEIR_I965); + } + if (eir & GM45_ERROR_PAGE_TABLE) { + u32 pgtbl_err = I915_READ(PGTBL_ER); + pr_err("page table error\n"); + pr_err(" PGTBL_ER: 0x%08x\n", pgtbl_err); + I915_WRITE(PGTBL_ER, pgtbl_err); + POSTING_READ(PGTBL_ER); + } + } + + if (!IS_GEN2(dev)) { + if (eir & I915_ERROR_PAGE_TABLE) { + u32 pgtbl_err = I915_READ(PGTBL_ER); + pr_err("page table error\n"); + pr_err(" PGTBL_ER: 0x%08x\n", pgtbl_err); + I915_WRITE(PGTBL_ER, pgtbl_err); + POSTING_READ(PGTBL_ER); + } + } + + if (eir & I915_ERROR_MEMORY_REFRESH) { + pr_err("memory refresh error:\n"); + for_each_pipe(dev_priv, pipe) + pr_err("pipe %c stat: 0x%08x\n", + pipe_name(pipe), I915_READ(PIPESTAT(pipe))); + /* pipestat has already been acked */ + } + if (eir & I915_ERROR_INSTRUCTION) { + pr_err("instruction error\n"); + pr_err(" INSTPM: 0x%08x\n", I915_READ(INSTPM)); + for (i = 0; i < ARRAY_SIZE(instdone); i++) + pr_err(" INSTDONE_%d: 0x%08x\n", i, instdone[i]); + if (INTEL_INFO(dev)->gen < 4) { + u32 ipeir = I915_READ(IPEIR); + + pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR)); + pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR)); + pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD)); + I915_WRITE(IPEIR, ipeir); + POSTING_READ(IPEIR); + } else { + u32 ipeir = I915_READ(IPEIR_I965); + + pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR_I965)); + pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR_I965)); + pr_err(" INSTPS: 0x%08x\n", I915_READ(INSTPS)); + pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD_I965)); + I915_WRITE(IPEIR_I965, ipeir); + POSTING_READ(IPEIR_I965); + } + } + + I915_WRITE(EIR, eir); + POSTING_READ(EIR); + eir = I915_READ(EIR); + if (eir) { + /* + * some errors might have become stuck, + * mask them. + */ + DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir); + I915_WRITE(EMR, I915_READ(EMR) | eir); + I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT); + } +} + +/** + * i915_handle_error - handle a gpu error + * @dev: drm device + * + * Do some basic checking of regsiter state at error time and + * dump it to the syslog. Also call i915_capture_error_state() to make + * sure we get a record and make it available in debugfs. Fire a uevent + * so userspace knows something bad happened (should trigger collection + * of a ring dump etc.). + */ +void i915_handle_error(struct drm_device *dev, bool wedged, + const char *fmt, ...) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + va_list args; + char error_msg[80]; + + va_start(args, fmt); + vscnprintf(error_msg, sizeof(error_msg), fmt, args); + va_end(args); + + i915_capture_error_state(dev, wedged, error_msg); + i915_report_and_clear_eir(dev); + + if (wedged) { + atomic_set_mask(I915_RESET_IN_PROGRESS_FLAG, + &dev_priv->gpu_error.reset_counter); + + /* + * Wakeup waiting processes so that the reset function + * i915_reset_and_wakeup doesn't deadlock trying to grab + * various locks. By bumping the reset counter first, the woken + * processes will see a reset in progress and back off, + * releasing their locks and then wait for the reset completion. + * We must do this for _all_ gpu waiters that might hold locks + * that the reset work needs to acquire. + * + * Note: The wake_up serves as the required memory barrier to + * ensure that the waiters see the updated value of the reset + * counter atomic_t. + */ + i915_error_wake_up(dev_priv, false); + } + + i915_reset_and_wakeup(dev); +} + +/* Called from drm generic code, passed 'crtc' which + * we use as a pipe index + */ +static int i915_enable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + if (INTEL_INFO(dev)->gen >= 4) + i915_enable_pipestat(dev_priv, pipe, + PIPE_START_VBLANK_INTERRUPT_STATUS); + else + i915_enable_pipestat(dev_priv, pipe, + PIPE_VBLANK_INTERRUPT_STATUS); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); + + return 0; +} + +static int ironlake_enable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + uint32_t bit = (INTEL_INFO(dev)->gen >= 7) ? DE_PIPE_VBLANK_IVB(pipe) : + DE_PIPE_VBLANK(pipe); + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + ironlake_enable_display_irq(dev_priv, bit); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); + + return 0; +} + +static int valleyview_enable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + i915_enable_pipestat(dev_priv, pipe, + PIPE_START_VBLANK_INTERRUPT_STATUS); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); + + return 0; +} + +static int gen8_enable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_VBLANK; + I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]); + POSTING_READ(GEN8_DE_PIPE_IMR(pipe)); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); + return 0; +} + +/* Called from drm generic code, passed 'crtc' which + * we use as a pipe index + */ +static void i915_disable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + i915_disable_pipestat(dev_priv, pipe, + PIPE_VBLANK_INTERRUPT_STATUS | + PIPE_START_VBLANK_INTERRUPT_STATUS); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); +} + +static void ironlake_disable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + uint32_t bit = (INTEL_INFO(dev)->gen >= 7) ? DE_PIPE_VBLANK_IVB(pipe) : + DE_PIPE_VBLANK(pipe); + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + ironlake_disable_display_irq(dev_priv, bit); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); +} + +static void valleyview_disable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + i915_disable_pipestat(dev_priv, pipe, + PIPE_START_VBLANK_INTERRUPT_STATUS); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); +} + +static void gen8_disable_vblank(struct drm_device *dev, int pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); + dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_VBLANK; + I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]); + POSTING_READ(GEN8_DE_PIPE_IMR(pipe)); + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); +} + +static bool +ring_idle(struct intel_engine_cs *ring, u32 seqno) +{ + return (list_empty(&ring->request_list) || + i915_seqno_passed(seqno, ring->last_submitted_seqno)); +} + +static bool +ipehr_is_semaphore_wait(struct drm_device *dev, u32 ipehr) +{ + if (INTEL_INFO(dev)->gen >= 8) { + return (ipehr >> 23) == 0x1c; + } else { + ipehr &= ~MI_SEMAPHORE_SYNC_MASK; + return ipehr == (MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | + MI_SEMAPHORE_REGISTER); + } +} + +static struct intel_engine_cs * +semaphore_wait_to_signaller_ring(struct intel_engine_cs *ring, u32 ipehr, u64 offset) +{ + struct drm_i915_private *dev_priv = ring->dev->dev_private; + struct intel_engine_cs *signaller; + int i; + + if (INTEL_INFO(dev_priv->dev)->gen >= 8) { + for_each_ring(signaller, dev_priv, i) { + if (ring == signaller) + continue; + + if (offset == signaller->semaphore.signal_ggtt[ring->id]) + return signaller; + } + } else { + u32 sync_bits = ipehr & MI_SEMAPHORE_SYNC_MASK; + + for_each_ring(signaller, dev_priv, i) { + if(ring == signaller) + continue; + + if (sync_bits == signaller->semaphore.mbox.wait[ring->id]) + return signaller; + } + } + + DRM_ERROR("No signaller ring found for ring %i, ipehr 0x%08x, offset 0x%016llx\n", + ring->id, ipehr, offset); + + return NULL; +} + +static struct intel_engine_cs * +semaphore_waits_for(struct intel_engine_cs *ring, u32 *seqno) +{ + struct drm_i915_private *dev_priv = ring->dev->dev_private; + u32 cmd, ipehr, head; + u64 offset = 0; + int i, backwards; + + ipehr = I915_READ(RING_IPEHR(ring->mmio_base)); + if (!ipehr_is_semaphore_wait(ring->dev, ipehr)) + return NULL; + + /* + * HEAD is likely pointing to the dword after the actual command, + * so scan backwards until we find the MBOX. But limit it to just 3 + * or 4 dwords depending on the semaphore wait command size. + * Note that we don't care about ACTHD here since that might + * point at at batch, and semaphores are always emitted into the + * ringbuffer itself. + */ + head = I915_READ_HEAD(ring) & HEAD_ADDR; + backwards = (INTEL_INFO(ring->dev)->gen >= 8) ? 5 : 4; + + for (i = backwards; i; --i) { + /* + * Be paranoid and presume the hw has gone off into the wild - + * our ring is smaller than what the hardware (and hence + * HEAD_ADDR) allows. Also handles wrap-around. + */ + head &= ring->buffer->size - 1; + + /* This here seems to blow up */ + cmd = ioread32(ring->buffer->virtual_start + head); + if (cmd == ipehr) + break; + + head -= 4; + } + + if (!i) + return NULL; + + *seqno = ioread32(ring->buffer->virtual_start + head + 4) + 1; + if (INTEL_INFO(ring->dev)->gen >= 8) { + offset = ioread32(ring->buffer->virtual_start + head + 12); + offset <<= 32; + offset = ioread32(ring->buffer->virtual_start + head + 8); + } + return semaphore_wait_to_signaller_ring(ring, ipehr, offset); +} + +static int semaphore_passed(struct intel_engine_cs *ring) +{ + struct drm_i915_private *dev_priv = ring->dev->dev_private; + struct intel_engine_cs *signaller; + u32 seqno; + + ring->hangcheck.deadlock++; + + signaller = semaphore_waits_for(ring, &seqno); + if (signaller == NULL) + return -1; + + /* Prevent pathological recursion due to driver bugs */ + if (signaller->hangcheck.deadlock >= I915_NUM_RINGS) + return -1; + + if (i915_seqno_passed(signaller->get_seqno(signaller, false), seqno)) + return 1; + + /* cursory check for an unkickable deadlock */ + if (I915_READ_CTL(signaller) & RING_WAIT_SEMAPHORE && + semaphore_passed(signaller) < 0) + return -1; + + return 0; +} + +static void semaphore_clear_deadlocks(struct drm_i915_private *dev_priv) +{ + struct intel_engine_cs *ring; + int i; + + for_each_ring(ring, dev_priv, i) + ring->hangcheck.deadlock = 0; +} + +static enum intel_ring_hangcheck_action +ring_stuck(struct intel_engine_cs *ring, u64 acthd) +{ + struct drm_device *dev = ring->dev; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 tmp; + + if (acthd != ring->hangcheck.acthd) { + if (acthd > ring->hangcheck.max_acthd) { + ring->hangcheck.max_acthd = acthd; + return HANGCHECK_ACTIVE; + } + + return HANGCHECK_ACTIVE_LOOP; + } + + if (IS_GEN2(dev)) + return HANGCHECK_HUNG; + + /* Is the chip hanging on a WAIT_FOR_EVENT? + * If so we can simply poke the RB_WAIT bit + * and break the hang. This should work on + * all but the second generation chipsets. + */ + tmp = I915_READ_CTL(ring); + if (tmp & RING_WAIT) { + i915_handle_error(dev, false, + "Kicking stuck wait on %s", + ring->name); + I915_WRITE_CTL(ring, tmp); + return HANGCHECK_KICK; + } + + if (INTEL_INFO(dev)->gen >= 6 && tmp & RING_WAIT_SEMAPHORE) { + switch (semaphore_passed(ring)) { + default: + return HANGCHECK_HUNG; + case 1: + i915_handle_error(dev, false, + "Kicking stuck semaphore on %s", + ring->name); + I915_WRITE_CTL(ring, tmp); + return HANGCHECK_KICK; + case 0: + return HANGCHECK_WAIT; + } + } + + return HANGCHECK_HUNG; +} + +/* + * This is called when the chip hasn't reported back with completed + * batchbuffers in a long time. We keep track per ring seqno progress and + * if there are no progress, hangcheck score for that ring is increased. + * Further, acthd is inspected to see if the ring is stuck. On stuck case + * we kick the ring. If we see no progress on three subsequent calls + * we assume chip is wedged and try to fix it by resetting the chip. + */ +static void i915_hangcheck_elapsed(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, typeof(*dev_priv), + gpu_error.hangcheck_work.work); + struct drm_device *dev = dev_priv->dev; + struct intel_engine_cs *ring; + int i; + int busy_count = 0, rings_hung = 0; + bool stuck[I915_NUM_RINGS] = { 0 }; +#define BUSY 1 +#define KICK 5 +#define HUNG 20 + + if (!i915.enable_hangcheck) + return; + + for_each_ring(ring, dev_priv, i) { + u64 acthd; + u32 seqno; + bool busy = true; + + semaphore_clear_deadlocks(dev_priv); + + seqno = ring->get_seqno(ring, false); + acthd = intel_ring_get_active_head(ring); + + if (ring->hangcheck.seqno == seqno) { + if (ring_idle(ring, seqno)) { + ring->hangcheck.action = HANGCHECK_IDLE; + + if (waitqueue_active(&ring->irq_queue)) { + /* Issue a wake-up to catch stuck h/w. */ + if (!test_and_set_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings)) { + if (!(dev_priv->gpu_error.test_irq_rings & intel_ring_flag(ring))) + DRM_ERROR("Hangcheck timer elapsed... %s idle\n", + ring->name); + else + DRM_INFO("Fake missed irq on %s\n", + ring->name); + wake_up_all(&ring->irq_queue); + } + /* Safeguard against driver failure */ + ring->hangcheck.score += BUSY; + } else + busy = false; + } else { + /* We always increment the hangcheck score + * if the ring is busy and still processing + * the same request, so that no single request + * can run indefinitely (such as a chain of + * batches). The only time we do not increment + * the hangcheck score on this ring, if this + * ring is in a legitimate wait for another + * ring. In that case the waiting ring is a + * victim and we want to be sure we catch the + * right culprit. Then every time we do kick + * the ring, add a small increment to the + * score so that we can catch a batch that is + * being repeatedly kicked and so responsible + * for stalling the machine. + */ + ring->hangcheck.action = ring_stuck(ring, + acthd); + + switch (ring->hangcheck.action) { + case HANGCHECK_IDLE: + case HANGCHECK_WAIT: + case HANGCHECK_ACTIVE: + break; + case HANGCHECK_ACTIVE_LOOP: + ring->hangcheck.score += BUSY; + break; + case HANGCHECK_KICK: + ring->hangcheck.score += KICK; + break; + case HANGCHECK_HUNG: + ring->hangcheck.score += HUNG; + stuck[i] = true; + break; + } + } + } else { + ring->hangcheck.action = HANGCHECK_ACTIVE; + + /* Gradually reduce the count so that we catch DoS + * attempts across multiple batches. + */ + if (ring->hangcheck.score > 0) + ring->hangcheck.score--; + + ring->hangcheck.acthd = ring->hangcheck.max_acthd = 0; + } + + ring->hangcheck.seqno = seqno; + ring->hangcheck.acthd = acthd; + busy_count += busy; + } + + for_each_ring(ring, dev_priv, i) { + if (ring->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG) { + DRM_INFO("%s on %s\n", + stuck[i] ? "stuck" : "no progress", + ring->name); + rings_hung++; + } + } + + if (rings_hung) + return i915_handle_error(dev, true, "Ring hung"); + + if (busy_count) + /* Reset timer case chip hangs without another request + * being added */ + i915_queue_hangcheck(dev); +} + +void i915_queue_hangcheck(struct drm_device *dev) +{ + struct i915_gpu_error *e = &to_i915(dev)->gpu_error; + + if (!i915.enable_hangcheck) + return; + + /* Don't continually defer the hangcheck so that it is always run at + * least once after work has been scheduled on any ring. Otherwise, + * we will ignore a hung ring if a second ring is kept busy. + */ + + queue_delayed_work(e->hangcheck_wq, &e->hangcheck_work, + round_jiffies_up_relative(DRM_I915_HANGCHECK_JIFFIES)); +} + +static void ibx_irq_reset(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (HAS_PCH_NOP(dev)) + return; + + GEN5_IRQ_RESET(SDE); + + if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev)) + I915_WRITE(SERR_INT, 0xffffffff); +} + +/* + * SDEIER is also touched by the interrupt handler to work around missed PCH + * interrupts. Hence we can't update it after the interrupt handler is enabled - + * instead we unconditionally enable all PCH interrupt sources here, but then + * only unmask them as needed with SDEIMR. + * + * This function needs to be called before interrupts are enabled. + */ +static void ibx_irq_pre_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (HAS_PCH_NOP(dev)) + return; + + WARN_ON(I915_READ(SDEIER) != 0); + I915_WRITE(SDEIER, 0xffffffff); + POSTING_READ(SDEIER); +} + +static void gen5_gt_irq_reset(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + GEN5_IRQ_RESET(GT); + if (INTEL_INFO(dev)->gen >= 6) + GEN5_IRQ_RESET(GEN6_PM); +} + +/* drm_dma.h hooks +*/ +static void ironlake_irq_reset(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + I915_WRITE(HWSTAM, 0xffffffff); + + GEN5_IRQ_RESET(DE); + if (IS_GEN7(dev)) + I915_WRITE(GEN7_ERR_INT, 0xffffffff); + + gen5_gt_irq_reset(dev); + + ibx_irq_reset(dev); +} + +static void vlv_display_irq_reset(struct drm_i915_private *dev_priv) +{ + enum pipe pipe; + + I915_WRITE(PORT_HOTPLUG_EN, 0); + I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT)); + + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), 0xffff); + + GEN5_IRQ_RESET(VLV_); +} + +static void valleyview_irq_preinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + /* VLV magic */ + I915_WRITE(VLV_IMR, 0); + I915_WRITE(RING_IMR(RENDER_RING_BASE), 0); + I915_WRITE(RING_IMR(GEN6_BSD_RING_BASE), 0); + I915_WRITE(RING_IMR(BLT_RING_BASE), 0); + + gen5_gt_irq_reset(dev); + + I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK); + + vlv_display_irq_reset(dev_priv); +} + +static void gen8_gt_irq_reset(struct drm_i915_private *dev_priv) +{ + GEN8_IRQ_RESET_NDX(GT, 0); + GEN8_IRQ_RESET_NDX(GT, 1); + GEN8_IRQ_RESET_NDX(GT, 2); + GEN8_IRQ_RESET_NDX(GT, 3); +} + +static void gen8_irq_reset(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + + I915_WRITE(GEN8_MASTER_IRQ, 0); + POSTING_READ(GEN8_MASTER_IRQ); + + gen8_gt_irq_reset(dev_priv); + + for_each_pipe(dev_priv, pipe) + if (intel_display_power_is_enabled(dev_priv, + POWER_DOMAIN_PIPE(pipe))) + GEN8_IRQ_RESET_NDX(DE_PIPE, pipe); + + GEN5_IRQ_RESET(GEN8_DE_PORT_); + GEN5_IRQ_RESET(GEN8_DE_MISC_); + GEN5_IRQ_RESET(GEN8_PCU_); + + ibx_irq_reset(dev); +} + +void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv, + unsigned int pipe_mask) +{ + uint32_t extra_ier = GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN; + + spin_lock_irq(&dev_priv->irq_lock); + if (pipe_mask & 1 << PIPE_A) + GEN8_IRQ_INIT_NDX(DE_PIPE, PIPE_A, + dev_priv->de_irq_mask[PIPE_A], + ~dev_priv->de_irq_mask[PIPE_A] | extra_ier); + if (pipe_mask & 1 << PIPE_B) + GEN8_IRQ_INIT_NDX(DE_PIPE, PIPE_B, + dev_priv->de_irq_mask[PIPE_B], + ~dev_priv->de_irq_mask[PIPE_B] | extra_ier); + if (pipe_mask & 1 << PIPE_C) + GEN8_IRQ_INIT_NDX(DE_PIPE, PIPE_C, + dev_priv->de_irq_mask[PIPE_C], + ~dev_priv->de_irq_mask[PIPE_C] | extra_ier); + spin_unlock_irq(&dev_priv->irq_lock); +} + +static void cherryview_irq_preinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + I915_WRITE(GEN8_MASTER_IRQ, 0); + POSTING_READ(GEN8_MASTER_IRQ); + + gen8_gt_irq_reset(dev_priv); + + GEN5_IRQ_RESET(GEN8_PCU_); + + I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK_CHV); + + vlv_display_irq_reset(dev_priv); +} + +static void ibx_hpd_irq_setup(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_encoder *intel_encoder; + u32 hotplug_irqs, hotplug, enabled_irqs = 0; + + if (HAS_PCH_IBX(dev)) { + hotplug_irqs = SDE_HOTPLUG_MASK; + for_each_intel_encoder(dev, intel_encoder) + if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED) + enabled_irqs |= hpd_ibx[intel_encoder->hpd_pin]; + } else { + hotplug_irqs = SDE_HOTPLUG_MASK_CPT; + for_each_intel_encoder(dev, intel_encoder) + if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED) + enabled_irqs |= hpd_cpt[intel_encoder->hpd_pin]; + } + + ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs); + + /* + * Enable digital hotplug on the PCH, and configure the DP short pulse + * duration to 2ms (which is the minimum in the Display Port spec) + * + * This register is the same on all known PCH chips. + */ + hotplug = I915_READ(PCH_PORT_HOTPLUG); + hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK); + hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms; + hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms; + hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms; + I915_WRITE(PCH_PORT_HOTPLUG, hotplug); +} + +static void ibx_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 mask; + + if (HAS_PCH_NOP(dev)) + return; + + if (HAS_PCH_IBX(dev)) + mask = SDE_GMBUS | SDE_AUX_MASK | SDE_POISON; + else + mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT; + + GEN5_ASSERT_IIR_IS_ZERO(SDEIIR); + I915_WRITE(SDEIMR, ~mask); +} + +static void gen5_gt_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pm_irqs, gt_irqs; + + pm_irqs = gt_irqs = 0; + + dev_priv->gt_irq_mask = ~0; + if (HAS_L3_DPF(dev)) { + /* L3 parity interrupt is always unmasked. */ + dev_priv->gt_irq_mask = ~GT_PARITY_ERROR(dev); + gt_irqs |= GT_PARITY_ERROR(dev); + } + + gt_irqs |= GT_RENDER_USER_INTERRUPT; + if (IS_GEN5(dev)) { + gt_irqs |= GT_RENDER_PIPECTL_NOTIFY_INTERRUPT | + ILK_BSD_USER_INTERRUPT; + } else { + gt_irqs |= GT_BLT_USER_INTERRUPT | GT_BSD_USER_INTERRUPT; + } + + GEN5_IRQ_INIT(GT, dev_priv->gt_irq_mask, gt_irqs); + + if (INTEL_INFO(dev)->gen >= 6) { + /* + * RPS interrupts will get enabled/disabled on demand when RPS + * itself is enabled/disabled. + */ + if (HAS_VEBOX(dev)) + pm_irqs |= PM_VEBOX_USER_INTERRUPT; + + dev_priv->pm_irq_mask = 0xffffffff; + GEN5_IRQ_INIT(GEN6_PM, dev_priv->pm_irq_mask, pm_irqs); + } +} + +static int ironlake_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 display_mask, extra_mask; + + if (INTEL_INFO(dev)->gen >= 7) { + display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE_IVB | + DE_PCH_EVENT_IVB | DE_PLANEC_FLIP_DONE_IVB | + DE_PLANEB_FLIP_DONE_IVB | + DE_PLANEA_FLIP_DONE_IVB | DE_AUX_CHANNEL_A_IVB); + extra_mask = (DE_PIPEC_VBLANK_IVB | DE_PIPEB_VBLANK_IVB | + DE_PIPEA_VBLANK_IVB | DE_ERR_INT_IVB); + } else { + display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT | + DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE | + DE_AUX_CHANNEL_A | + DE_PIPEB_CRC_DONE | DE_PIPEA_CRC_DONE | + DE_POISON); + extra_mask = DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT | + DE_PIPEB_FIFO_UNDERRUN | DE_PIPEA_FIFO_UNDERRUN; + } + + dev_priv->irq_mask = ~display_mask; + + I915_WRITE(HWSTAM, 0xeffe); + + ibx_irq_pre_postinstall(dev); + + GEN5_IRQ_INIT(DE, dev_priv->irq_mask, display_mask | extra_mask); + + gen5_gt_irq_postinstall(dev); + + ibx_irq_postinstall(dev); + + if (IS_IRONLAKE_M(dev)) { + /* Enable PCU event interrupts + * + * spinlocking not required here for correctness since interrupt + * setup is guaranteed to run in single-threaded context. But we + * need it to make the assert_spin_locked happy. */ + spin_lock_irq(&dev_priv->irq_lock); + ironlake_enable_display_irq(dev_priv, DE_PCU_EVENT); + spin_unlock_irq(&dev_priv->irq_lock); + } + + return 0; +} + +static void valleyview_display_irqs_install(struct drm_i915_private *dev_priv) +{ + u32 pipestat_mask; + u32 iir_mask; + enum pipe pipe; + + pipestat_mask = PIPESTAT_INT_STATUS_MASK | + PIPE_FIFO_UNDERRUN_STATUS; + + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), pipestat_mask); + POSTING_READ(PIPESTAT(PIPE_A)); + + pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV | + PIPE_CRC_DONE_INTERRUPT_STATUS; + + i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS); + for_each_pipe(dev_priv, pipe) + i915_enable_pipestat(dev_priv, pipe, pipestat_mask); + + iir_mask = I915_DISPLAY_PORT_INTERRUPT | + I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT; + if (IS_CHERRYVIEW(dev_priv)) + iir_mask |= I915_DISPLAY_PIPE_C_EVENT_INTERRUPT; + dev_priv->irq_mask &= ~iir_mask; + + I915_WRITE(VLV_IIR, iir_mask); + I915_WRITE(VLV_IIR, iir_mask); + I915_WRITE(VLV_IER, ~dev_priv->irq_mask); + I915_WRITE(VLV_IMR, dev_priv->irq_mask); + POSTING_READ(VLV_IMR); +} + +static void valleyview_display_irqs_uninstall(struct drm_i915_private *dev_priv) +{ + u32 pipestat_mask; + u32 iir_mask; + enum pipe pipe; + + iir_mask = I915_DISPLAY_PORT_INTERRUPT | + I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT; + if (IS_CHERRYVIEW(dev_priv)) + iir_mask |= I915_DISPLAY_PIPE_C_EVENT_INTERRUPT; + + dev_priv->irq_mask |= iir_mask; + I915_WRITE(VLV_IMR, dev_priv->irq_mask); + I915_WRITE(VLV_IER, ~dev_priv->irq_mask); + I915_WRITE(VLV_IIR, iir_mask); + I915_WRITE(VLV_IIR, iir_mask); + POSTING_READ(VLV_IIR); + + pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV | + PIPE_CRC_DONE_INTERRUPT_STATUS; + + i915_disable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS); + for_each_pipe(dev_priv, pipe) + i915_disable_pipestat(dev_priv, pipe, pipestat_mask); + + pipestat_mask = PIPESTAT_INT_STATUS_MASK | + PIPE_FIFO_UNDERRUN_STATUS; + + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), pipestat_mask); + POSTING_READ(PIPESTAT(PIPE_A)); +} + +void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv) +{ + assert_spin_locked(&dev_priv->irq_lock); + + if (dev_priv->display_irqs_enabled) + return; + + dev_priv->display_irqs_enabled = true; + + if (intel_irqs_enabled(dev_priv)) + valleyview_display_irqs_install(dev_priv); +} + +void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv) +{ + assert_spin_locked(&dev_priv->irq_lock); + + if (!dev_priv->display_irqs_enabled) + return; + + dev_priv->display_irqs_enabled = false; + + if (intel_irqs_enabled(dev_priv)) + valleyview_display_irqs_uninstall(dev_priv); +} + +static void vlv_display_irq_postinstall(struct drm_i915_private *dev_priv) +{ + dev_priv->irq_mask = ~0; + + I915_WRITE(PORT_HOTPLUG_EN, 0); + POSTING_READ(PORT_HOTPLUG_EN); + + I915_WRITE(VLV_IIR, 0xffffffff); + I915_WRITE(VLV_IIR, 0xffffffff); + I915_WRITE(VLV_IER, ~dev_priv->irq_mask); + I915_WRITE(VLV_IMR, dev_priv->irq_mask); + POSTING_READ(VLV_IMR); + + /* Interrupt setup is already guaranteed to be single-threaded, this is + * just to make the assert_spin_locked check happy. */ + spin_lock_irq(&dev_priv->irq_lock); + if (dev_priv->display_irqs_enabled) + valleyview_display_irqs_install(dev_priv); + spin_unlock_irq(&dev_priv->irq_lock); +} + +static int valleyview_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + vlv_display_irq_postinstall(dev_priv); + + gen5_gt_irq_postinstall(dev); + + /* ack & enable invalid PTE error interrupts */ +#if 0 /* FIXME: add support to irq handler for checking these bits */ + I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK); + I915_WRITE(DPINVGTT, DPINVGTT_EN_MASK); +#endif + + I915_WRITE(VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE); + + return 0; +} + +static void gen8_gt_irq_postinstall(struct drm_i915_private *dev_priv) +{ + /* These are interrupts we'll toggle with the ring mask register */ + uint32_t gt_interrupts[] = { + GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT | + GT_CONTEXT_SWITCH_INTERRUPT << GEN8_RCS_IRQ_SHIFT | + GT_RENDER_L3_PARITY_ERROR_INTERRUPT | + GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT | + GT_CONTEXT_SWITCH_INTERRUPT << GEN8_BCS_IRQ_SHIFT, + GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT | + GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS1_IRQ_SHIFT | + GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT | + GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS2_IRQ_SHIFT, + 0, + GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT | + GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VECS_IRQ_SHIFT + }; + + dev_priv->pm_irq_mask = 0xffffffff; + GEN8_IRQ_INIT_NDX(GT, 0, ~gt_interrupts[0], gt_interrupts[0]); + GEN8_IRQ_INIT_NDX(GT, 1, ~gt_interrupts[1], gt_interrupts[1]); + /* + * RPS interrupts will get enabled/disabled on demand when RPS itself + * is enabled/disabled. + */ + GEN8_IRQ_INIT_NDX(GT, 2, dev_priv->pm_irq_mask, 0); + GEN8_IRQ_INIT_NDX(GT, 3, ~gt_interrupts[3], gt_interrupts[3]); +} + +static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv) +{ + uint32_t de_pipe_masked = GEN8_PIPE_CDCLK_CRC_DONE; + uint32_t de_pipe_enables; + int pipe; + u32 aux_en = GEN8_AUX_CHANNEL_A; + + if (IS_GEN9(dev_priv)) { + de_pipe_masked |= GEN9_PIPE_PLANE1_FLIP_DONE | + GEN9_DE_PIPE_IRQ_FAULT_ERRORS; + aux_en |= GEN9_AUX_CHANNEL_B | GEN9_AUX_CHANNEL_C | + GEN9_AUX_CHANNEL_D; + } else + de_pipe_masked |= GEN8_PIPE_PRIMARY_FLIP_DONE | + GEN8_DE_PIPE_IRQ_FAULT_ERRORS; + + de_pipe_enables = de_pipe_masked | GEN8_PIPE_VBLANK | + GEN8_PIPE_FIFO_UNDERRUN; + + dev_priv->de_irq_mask[PIPE_A] = ~de_pipe_masked; + dev_priv->de_irq_mask[PIPE_B] = ~de_pipe_masked; + dev_priv->de_irq_mask[PIPE_C] = ~de_pipe_masked; + + for_each_pipe(dev_priv, pipe) + if (intel_display_power_is_enabled(dev_priv, + POWER_DOMAIN_PIPE(pipe))) + GEN8_IRQ_INIT_NDX(DE_PIPE, pipe, + dev_priv->de_irq_mask[pipe], + de_pipe_enables); + + GEN5_IRQ_INIT(GEN8_DE_PORT_, ~aux_en, aux_en); +} + +static int gen8_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + ibx_irq_pre_postinstall(dev); + + gen8_gt_irq_postinstall(dev_priv); + gen8_de_irq_postinstall(dev_priv); + + ibx_irq_postinstall(dev); + + I915_WRITE(GEN8_MASTER_IRQ, DE_MASTER_IRQ_CONTROL); + POSTING_READ(GEN8_MASTER_IRQ); + + return 0; +} + +static int cherryview_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + vlv_display_irq_postinstall(dev_priv); + + gen8_gt_irq_postinstall(dev_priv); + + I915_WRITE(GEN8_MASTER_IRQ, MASTER_INTERRUPT_ENABLE); + POSTING_READ(GEN8_MASTER_IRQ); + + return 0; +} + +static void gen8_irq_uninstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (!dev_priv) + return; + + gen8_irq_reset(dev); +} + +static void vlv_display_irq_uninstall(struct drm_i915_private *dev_priv) +{ + /* Interrupt setup is already guaranteed to be single-threaded, this is + * just to make the assert_spin_locked check happy. */ + spin_lock_irq(&dev_priv->irq_lock); + if (dev_priv->display_irqs_enabled) + valleyview_display_irqs_uninstall(dev_priv); + spin_unlock_irq(&dev_priv->irq_lock); + + vlv_display_irq_reset(dev_priv); + + dev_priv->irq_mask = ~0; +} + +static void valleyview_irq_uninstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (!dev_priv) + return; + + I915_WRITE(VLV_MASTER_IER, 0); + + gen5_gt_irq_reset(dev); + + I915_WRITE(HWSTAM, 0xffffffff); + + vlv_display_irq_uninstall(dev_priv); +} + +static void cherryview_irq_uninstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (!dev_priv) + return; + + I915_WRITE(GEN8_MASTER_IRQ, 0); + POSTING_READ(GEN8_MASTER_IRQ); + + gen8_gt_irq_reset(dev_priv); + + GEN5_IRQ_RESET(GEN8_PCU_); + + vlv_display_irq_uninstall(dev_priv); +} + +static void ironlake_irq_uninstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (!dev_priv) + return; + + ironlake_irq_reset(dev); +} + +static void i8xx_irq_preinstall(struct drm_device * dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), 0); + I915_WRITE16(IMR, 0xffff); + I915_WRITE16(IER, 0x0); + POSTING_READ16(IER); +} + +static int i8xx_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + I915_WRITE16(EMR, + ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH)); + + /* Unmask the interrupts that we always want on. */ + dev_priv->irq_mask = + ~(I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | + I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | + I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT); + I915_WRITE16(IMR, dev_priv->irq_mask); + + I915_WRITE16(IER, + I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | + I915_USER_INTERRUPT); + POSTING_READ16(IER); + + /* Interrupt setup is already guaranteed to be single-threaded, this is + * just to make the assert_spin_locked check happy. */ + spin_lock_irq(&dev_priv->irq_lock); + i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS); + i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS); + spin_unlock_irq(&dev_priv->irq_lock); + + return 0; +} + +/* + * Returns true when a page flip has completed. + */ +static bool i8xx_handle_vblank(struct drm_device *dev, + int plane, int pipe, u32 iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u16 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane); + + if (!intel_pipe_handle_vblank(dev, pipe)) + return false; + + if ((iir & flip_pending) == 0) + goto check_page_flip; + + /* We detect FlipDone by looking for the change in PendingFlip from '1' + * to '0' on the following vblank, i.e. IIR has the Pendingflip + * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence + * the flip is completed (no longer pending). Since this doesn't raise + * an interrupt per se, we watch for the change at vblank. + */ + if (I915_READ16(ISR) & flip_pending) + goto check_page_flip; + + intel_prepare_page_flip(dev, plane); + intel_finish_page_flip(dev, pipe); + return true; + +check_page_flip: + intel_check_page_flip(dev, pipe); + return false; +} + +static irqreturn_t i8xx_irq_handler(int irq, void *arg) +{ + struct drm_device *dev = arg; + struct drm_i915_private *dev_priv = dev->dev_private; + u16 iir, new_iir; + u32 pipe_stats[2]; + int pipe; + u16 flip_mask = + I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | + I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT; + + if (!intel_irqs_enabled(dev_priv)) + return IRQ_NONE; + + iir = I915_READ16(IIR); + if (iir == 0) + return IRQ_NONE; + + while (iir & ~flip_mask) { + /* Can't rely on pipestat interrupt bit in iir as it might + * have been cleared after the pipestat interrupt was received. + * It doesn't set the bit in iir again, but it still produces + * interrupts (for non-MSI). + */ + spin_lock(&dev_priv->irq_lock); + if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT) + DRM_DEBUG("Command parser error, iir 0x%08x\n", iir); + + for_each_pipe(dev_priv, pipe) { + int reg = PIPESTAT(pipe); + pipe_stats[pipe] = I915_READ(reg); + + /* + * Clear the PIPE*STAT regs before the IIR + */ + if (pipe_stats[pipe] & 0x8000ffff) + I915_WRITE(reg, pipe_stats[pipe]); + } + spin_unlock(&dev_priv->irq_lock); + + I915_WRITE16(IIR, iir & ~flip_mask); + new_iir = I915_READ16(IIR); /* Flush posted writes */ + + if (iir & I915_USER_INTERRUPT) + notify_ring(dev, &dev_priv->ring[RCS]); + + for_each_pipe(dev_priv, pipe) { + int plane = pipe; + if (HAS_FBC(dev)) + plane = !plane; + + if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS && + i8xx_handle_vblank(dev, plane, pipe, iir)) + flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane); + + if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS) + i9xx_pipe_crc_irq_handler(dev, pipe); + + if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS) + intel_cpu_fifo_underrun_irq_handler(dev_priv, + pipe); + } + + iir = new_iir; + } + + return IRQ_HANDLED; +} + +static void i8xx_irq_uninstall(struct drm_device * dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + + for_each_pipe(dev_priv, pipe) { + /* Clear enable bits; then clear status bits */ + I915_WRITE(PIPESTAT(pipe), 0); + I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe))); + } + I915_WRITE16(IMR, 0xffff); + I915_WRITE16(IER, 0x0); + I915_WRITE16(IIR, I915_READ16(IIR)); +} + +static void i915_irq_preinstall(struct drm_device * dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + + if (I915_HAS_HOTPLUG(dev)) { + I915_WRITE(PORT_HOTPLUG_EN, 0); + I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT)); + } + + I915_WRITE16(HWSTAM, 0xeffe); + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), 0); + I915_WRITE(IMR, 0xffffffff); + I915_WRITE(IER, 0x0); + POSTING_READ(IER); +} + +static int i915_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 enable_mask; + + I915_WRITE(EMR, ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH)); + + /* Unmask the interrupts that we always want on. */ + dev_priv->irq_mask = + ~(I915_ASLE_INTERRUPT | + I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | + I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | + I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT); + + enable_mask = + I915_ASLE_INTERRUPT | + I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | + I915_USER_INTERRUPT; + + if (I915_HAS_HOTPLUG(dev)) { + I915_WRITE(PORT_HOTPLUG_EN, 0); + POSTING_READ(PORT_HOTPLUG_EN); + + /* Enable in IER... */ + enable_mask |= I915_DISPLAY_PORT_INTERRUPT; + /* and unmask in IMR */ + dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT; + } + + I915_WRITE(IMR, dev_priv->irq_mask); + I915_WRITE(IER, enable_mask); + POSTING_READ(IER); + + i915_enable_asle_pipestat(dev); + + /* Interrupt setup is already guaranteed to be single-threaded, this is + * just to make the assert_spin_locked check happy. */ + spin_lock_irq(&dev_priv->irq_lock); + i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS); + i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS); + spin_unlock_irq(&dev_priv->irq_lock); + + return 0; +} + +/* + * Returns true when a page flip has completed. + */ +static bool i915_handle_vblank(struct drm_device *dev, + int plane, int pipe, u32 iir) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane); + + if (!intel_pipe_handle_vblank(dev, pipe)) + return false; + + if ((iir & flip_pending) == 0) + goto check_page_flip; + + /* We detect FlipDone by looking for the change in PendingFlip from '1' + * to '0' on the following vblank, i.e. IIR has the Pendingflip + * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence + * the flip is completed (no longer pending). Since this doesn't raise + * an interrupt per se, we watch for the change at vblank. + */ + if (I915_READ(ISR) & flip_pending) + goto check_page_flip; + + intel_prepare_page_flip(dev, plane); + intel_finish_page_flip(dev, pipe); + return true; + +check_page_flip: + intel_check_page_flip(dev, pipe); + return false; +} + +static irqreturn_t i915_irq_handler(int irq, void *arg) +{ + struct drm_device *dev = arg; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 iir, new_iir, pipe_stats[I915_MAX_PIPES]; + u32 flip_mask = + I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | + I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT; + int pipe, ret = IRQ_NONE; + + if (!intel_irqs_enabled(dev_priv)) + return IRQ_NONE; + + iir = I915_READ(IIR); + do { + bool irq_received = (iir & ~flip_mask) != 0; + bool blc_event = false; + + /* Can't rely on pipestat interrupt bit in iir as it might + * have been cleared after the pipestat interrupt was received. + * It doesn't set the bit in iir again, but it still produces + * interrupts (for non-MSI). + */ + spin_lock(&dev_priv->irq_lock); + if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT) + DRM_DEBUG("Command parser error, iir 0x%08x\n", iir); + + for_each_pipe(dev_priv, pipe) { + int reg = PIPESTAT(pipe); + pipe_stats[pipe] = I915_READ(reg); + + /* Clear the PIPE*STAT regs before the IIR */ + if (pipe_stats[pipe] & 0x8000ffff) { + I915_WRITE(reg, pipe_stats[pipe]); + irq_received = true; + } + } + spin_unlock(&dev_priv->irq_lock); + + if (!irq_received) + break; + + /* Consume port. Then clear IIR or we'll miss events */ + if (I915_HAS_HOTPLUG(dev) && + iir & I915_DISPLAY_PORT_INTERRUPT) + i9xx_hpd_irq_handler(dev); + + I915_WRITE(IIR, iir & ~flip_mask); + new_iir = I915_READ(IIR); /* Flush posted writes */ + + if (iir & I915_USER_INTERRUPT) + notify_ring(dev, &dev_priv->ring[RCS]); + + for_each_pipe(dev_priv, pipe) { + int plane = pipe; + if (HAS_FBC(dev)) + plane = !plane; + + if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS && + i915_handle_vblank(dev, plane, pipe, iir)) + flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane); + + if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS) + blc_event = true; + + if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS) + i9xx_pipe_crc_irq_handler(dev, pipe); + + if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS) + intel_cpu_fifo_underrun_irq_handler(dev_priv, + pipe); + } + + if (blc_event || (iir & I915_ASLE_INTERRUPT)) + intel_opregion_asle_intr(dev); + + /* With MSI, interrupts are only generated when iir + * transitions from zero to nonzero. If another bit got + * set while we were handling the existing iir bits, then + * we would never get another interrupt. + * + * This is fine on non-MSI as well, as if we hit this path + * we avoid exiting the interrupt handler only to generate + * another one. + * + * Note that for MSI this could cause a stray interrupt report + * if an interrupt landed in the time between writing IIR and + * the posting read. This should be rare enough to never + * trigger the 99% of 100,000 interrupts test for disabling + * stray interrupts. + */ + ret = IRQ_HANDLED; + iir = new_iir; + } while (iir & ~flip_mask); + + return ret; +} + +static void i915_irq_uninstall(struct drm_device * dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + + if (I915_HAS_HOTPLUG(dev)) { + I915_WRITE(PORT_HOTPLUG_EN, 0); + I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT)); + } + + I915_WRITE16(HWSTAM, 0xffff); + for_each_pipe(dev_priv, pipe) { + /* Clear enable bits; then clear status bits */ + I915_WRITE(PIPESTAT(pipe), 0); + I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe))); + } + I915_WRITE(IMR, 0xffffffff); + I915_WRITE(IER, 0x0); + + I915_WRITE(IIR, I915_READ(IIR)); +} + +static void i965_irq_preinstall(struct drm_device * dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + + I915_WRITE(PORT_HOTPLUG_EN, 0); + I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT)); + + I915_WRITE(HWSTAM, 0xeffe); + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), 0); + I915_WRITE(IMR, 0xffffffff); + I915_WRITE(IER, 0x0); + POSTING_READ(IER); +} + +static int i965_irq_postinstall(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 enable_mask; + u32 error_mask; + + /* Unmask the interrupts that we always want on. */ + dev_priv->irq_mask = ~(I915_ASLE_INTERRUPT | + I915_DISPLAY_PORT_INTERRUPT | + I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | + I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | + I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT | + I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT); + + enable_mask = ~dev_priv->irq_mask; + enable_mask &= ~(I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | + I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT); + enable_mask |= I915_USER_INTERRUPT; + + if (IS_G4X(dev)) + enable_mask |= I915_BSD_USER_INTERRUPT; + + /* Interrupt setup is already guaranteed to be single-threaded, this is + * just to make the assert_spin_locked check happy. */ + spin_lock_irq(&dev_priv->irq_lock); + i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS); + i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS); + i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS); + spin_unlock_irq(&dev_priv->irq_lock); + + /* + * Enable some error detection, note the instruction error mask + * bit is reserved, so we leave it masked. + */ + if (IS_G4X(dev)) { + error_mask = ~(GM45_ERROR_PAGE_TABLE | + GM45_ERROR_MEM_PRIV | + GM45_ERROR_CP_PRIV | + I915_ERROR_MEMORY_REFRESH); + } else { + error_mask = ~(I915_ERROR_PAGE_TABLE | + I915_ERROR_MEMORY_REFRESH); + } + I915_WRITE(EMR, error_mask); + + I915_WRITE(IMR, dev_priv->irq_mask); + I915_WRITE(IER, enable_mask); + POSTING_READ(IER); + + I915_WRITE(PORT_HOTPLUG_EN, 0); + POSTING_READ(PORT_HOTPLUG_EN); + + i915_enable_asle_pipestat(dev); + + return 0; +} + +static void i915_hpd_irq_setup(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_encoder *intel_encoder; + u32 hotplug_en; + + assert_spin_locked(&dev_priv->irq_lock); + + hotplug_en = I915_READ(PORT_HOTPLUG_EN); + hotplug_en &= ~HOTPLUG_INT_EN_MASK; + /* Note HDMI and DP share hotplug bits */ + /* enable bits are the same for all generations */ + for_each_intel_encoder(dev, intel_encoder) + if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED) + hotplug_en |= hpd_mask_i915[intel_encoder->hpd_pin]; + /* Programming the CRT detection parameters tends + to generate a spurious hotplug event about three + seconds later. So just do it once. + */ + if (IS_G4X(dev)) + hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64; + hotplug_en &= ~CRT_HOTPLUG_VOLTAGE_COMPARE_MASK; + hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50; + + /* Ignore TV since it's buggy */ + I915_WRITE(PORT_HOTPLUG_EN, hotplug_en); +} + +static irqreturn_t i965_irq_handler(int irq, void *arg) +{ + struct drm_device *dev = arg; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 iir, new_iir; + u32 pipe_stats[I915_MAX_PIPES]; + int ret = IRQ_NONE, pipe; + u32 flip_mask = + I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | + I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT; + + if (!intel_irqs_enabled(dev_priv)) + return IRQ_NONE; + + iir = I915_READ(IIR); + + for (;;) { + bool irq_received = (iir & ~flip_mask) != 0; + bool blc_event = false; + + /* Can't rely on pipestat interrupt bit in iir as it might + * have been cleared after the pipestat interrupt was received. + * It doesn't set the bit in iir again, but it still produces + * interrupts (for non-MSI). + */ + spin_lock(&dev_priv->irq_lock); + if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT) + DRM_DEBUG("Command parser error, iir 0x%08x\n", iir); + + for_each_pipe(dev_priv, pipe) { + int reg = PIPESTAT(pipe); + pipe_stats[pipe] = I915_READ(reg); + + /* + * Clear the PIPE*STAT regs before the IIR + */ + if (pipe_stats[pipe] & 0x8000ffff) { + I915_WRITE(reg, pipe_stats[pipe]); + irq_received = true; + } + } + spin_unlock(&dev_priv->irq_lock); + + if (!irq_received) + break; + + ret = IRQ_HANDLED; + + /* Consume port. Then clear IIR or we'll miss events */ + if (iir & I915_DISPLAY_PORT_INTERRUPT) + i9xx_hpd_irq_handler(dev); + + I915_WRITE(IIR, iir & ~flip_mask); + new_iir = I915_READ(IIR); /* Flush posted writes */ + + if (iir & I915_USER_INTERRUPT) + notify_ring(dev, &dev_priv->ring[RCS]); + if (iir & I915_BSD_USER_INTERRUPT) + notify_ring(dev, &dev_priv->ring[VCS]); + + for_each_pipe(dev_priv, pipe) { + if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS && + i915_handle_vblank(dev, pipe, pipe, iir)) + flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(pipe); + + if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS) + blc_event = true; + + if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS) + i9xx_pipe_crc_irq_handler(dev, pipe); + + if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS) + intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe); + } + + if (blc_event || (iir & I915_ASLE_INTERRUPT)) + intel_opregion_asle_intr(dev); + + if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS) + gmbus_irq_handler(dev); + + /* With MSI, interrupts are only generated when iir + * transitions from zero to nonzero. If another bit got + * set while we were handling the existing iir bits, then + * we would never get another interrupt. + * + * This is fine on non-MSI as well, as if we hit this path + * we avoid exiting the interrupt handler only to generate + * another one. + * + * Note that for MSI this could cause a stray interrupt report + * if an interrupt landed in the time between writing IIR and + * the posting read. This should be rare enough to never + * trigger the 99% of 100,000 interrupts test for disabling + * stray interrupts. + */ + iir = new_iir; + } + + return ret; +} + +static void i965_irq_uninstall(struct drm_device * dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; + + if (!dev_priv) + return; + + I915_WRITE(PORT_HOTPLUG_EN, 0); + I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT)); + + I915_WRITE(HWSTAM, 0xffffffff); + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), 0); + I915_WRITE(IMR, 0xffffffff); + I915_WRITE(IER, 0x0); + + for_each_pipe(dev_priv, pipe) + I915_WRITE(PIPESTAT(pipe), + I915_READ(PIPESTAT(pipe)) & 0x8000ffff); + I915_WRITE(IIR, I915_READ(IIR)); +} + +static void intel_hpd_irq_reenable_work(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, typeof(*dev_priv), + hotplug_reenable_work.work); + struct drm_device *dev = dev_priv->dev; + struct drm_mode_config *mode_config = &dev->mode_config; + int i; + + intel_runtime_pm_get(dev_priv); + + spin_lock_irq(&dev_priv->irq_lock); + for (i = (HPD_NONE + 1); i < HPD_NUM_PINS; i++) { + struct drm_connector *connector; + + if (dev_priv->hpd_stats[i].hpd_mark != HPD_DISABLED) + continue; + + dev_priv->hpd_stats[i].hpd_mark = HPD_ENABLED; + + list_for_each_entry(connector, &mode_config->connector_list, head) { + struct intel_connector *intel_connector = to_intel_connector(connector); + + if (intel_connector->encoder->hpd_pin == i) { + if (connector->polled != intel_connector->polled) + DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n", + connector->name); + connector->polled = intel_connector->polled; + if (!connector->polled) + connector->polled = DRM_CONNECTOR_POLL_HPD; + } + } + } + if (dev_priv->display.hpd_irq_setup) + dev_priv->display.hpd_irq_setup(dev); + spin_unlock_irq(&dev_priv->irq_lock); + + intel_runtime_pm_put(dev_priv); +} + +/** + * intel_irq_init - initializes irq support + * @dev_priv: i915 device instance + * + * This function initializes all the irq support including work items, timers + * and all the vtables. It does not setup the interrupt itself though. + */ +void intel_irq_init(struct drm_i915_private *dev_priv) +{ + struct drm_device *dev = dev_priv->dev; + + INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func); + INIT_WORK(&dev_priv->dig_port_work, i915_digport_work_func); + INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work); + INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work); + + /* Let's track the enabled rps events */ + if (IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) + /* WaGsvRC0ResidencyMethod:vlv */ + dev_priv->pm_rps_events = GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_UP_EI_EXPIRED; + else + dev_priv->pm_rps_events = GEN6_PM_RPS_EVENTS; + + INIT_DELAYED_WORK(&dev_priv->gpu_error.hangcheck_work, + i915_hangcheck_elapsed); + INIT_DELAYED_WORK(&dev_priv->hotplug_reenable_work, + intel_hpd_irq_reenable_work); + + pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE); + + if (IS_GEN2(dev_priv)) { + dev->max_vblank_count = 0; + dev->driver->get_vblank_counter = i8xx_get_vblank_counter; + } else if (IS_G4X(dev_priv) || INTEL_INFO(dev_priv)->gen >= 5) { + dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */ + dev->driver->get_vblank_counter = gm45_get_vblank_counter; + } else { + dev->driver->get_vblank_counter = i915_get_vblank_counter; + dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */ + } + + /* + * Opt out of the vblank disable timer on everything except gen2. + * Gen2 doesn't have a hardware frame counter and so depends on + * vblank interrupts to produce sane vblank seuquence numbers. + */ + if (!IS_GEN2(dev_priv)) + dev->vblank_disable_immediate = true; + + dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp; + dev->driver->get_scanout_position = i915_get_crtc_scanoutpos; + + if (IS_CHERRYVIEW(dev_priv)) { + dev->driver->irq_handler = cherryview_irq_handler; + dev->driver->irq_preinstall = cherryview_irq_preinstall; + dev->driver->irq_postinstall = cherryview_irq_postinstall; + dev->driver->irq_uninstall = cherryview_irq_uninstall; + dev->driver->enable_vblank = valleyview_enable_vblank; + dev->driver->disable_vblank = valleyview_disable_vblank; + dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup; + } else if (IS_VALLEYVIEW(dev_priv)) { + dev->driver->irq_handler = valleyview_irq_handler; + dev->driver->irq_preinstall = valleyview_irq_preinstall; + dev->driver->irq_postinstall = valleyview_irq_postinstall; + dev->driver->irq_uninstall = valleyview_irq_uninstall; + dev->driver->enable_vblank = valleyview_enable_vblank; + dev->driver->disable_vblank = valleyview_disable_vblank; + dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup; + } else if (INTEL_INFO(dev_priv)->gen >= 8) { + dev->driver->irq_handler = gen8_irq_handler; + dev->driver->irq_preinstall = gen8_irq_reset; + dev->driver->irq_postinstall = gen8_irq_postinstall; + dev->driver->irq_uninstall = gen8_irq_uninstall; + dev->driver->enable_vblank = gen8_enable_vblank; + dev->driver->disable_vblank = gen8_disable_vblank; + dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup; + } else if (HAS_PCH_SPLIT(dev)) { + dev->driver->irq_handler = ironlake_irq_handler; + dev->driver->irq_preinstall = ironlake_irq_reset; + dev->driver->irq_postinstall = ironlake_irq_postinstall; + dev->driver->irq_uninstall = ironlake_irq_uninstall; + dev->driver->enable_vblank = ironlake_enable_vblank; + dev->driver->disable_vblank = ironlake_disable_vblank; + dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup; + } else { + if (INTEL_INFO(dev_priv)->gen == 2) { + dev->driver->irq_preinstall = i8xx_irq_preinstall; + dev->driver->irq_postinstall = i8xx_irq_postinstall; + dev->driver->irq_handler = i8xx_irq_handler; + dev->driver->irq_uninstall = i8xx_irq_uninstall; + } else if (INTEL_INFO(dev_priv)->gen == 3) { + dev->driver->irq_preinstall = i915_irq_preinstall; + dev->driver->irq_postinstall = i915_irq_postinstall; + dev->driver->irq_uninstall = i915_irq_uninstall; + dev->driver->irq_handler = i915_irq_handler; + } else { + dev->driver->irq_preinstall = i965_irq_preinstall; + dev->driver->irq_postinstall = i965_irq_postinstall; + dev->driver->irq_uninstall = i965_irq_uninstall; + dev->driver->irq_handler = i965_irq_handler; + } + if (I915_HAS_HOTPLUG(dev_priv)) + dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup; + dev->driver->enable_vblank = i915_enable_vblank; + dev->driver->disable_vblank = i915_disable_vblank; + } +} + +/** + * intel_hpd_init - initializes and enables hpd support + * @dev_priv: i915 device instance + * + * This function enables the hotplug support. It requires that interrupts have + * already been enabled with intel_irq_init_hw(). From this point on hotplug and + * poll request can run concurrently to other code, so locking rules must be + * obeyed. + * + * This is a separate step from interrupt enabling to simplify the locking rules + * in the driver load and resume code. + */ +void intel_hpd_init(struct drm_i915_private *dev_priv) +{ + struct drm_device *dev = dev_priv->dev; + struct drm_mode_config *mode_config = &dev->mode_config; + struct drm_connector *connector; + int i; + + for (i = 1; i < HPD_NUM_PINS; i++) { + dev_priv->hpd_stats[i].hpd_cnt = 0; + dev_priv->hpd_stats[i].hpd_mark = HPD_ENABLED; + } + list_for_each_entry(connector, &mode_config->connector_list, head) { + struct intel_connector *intel_connector = to_intel_connector(connector); + connector->polled = intel_connector->polled; + if (connector->encoder && !connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE) + connector->polled = DRM_CONNECTOR_POLL_HPD; + if (intel_connector->mst_port) + connector->polled = DRM_CONNECTOR_POLL_HPD; + } + + /* Interrupt setup is already guaranteed to be single-threaded, this is + * just to make the assert_spin_locked checks happy. */ + spin_lock_irq(&dev_priv->irq_lock); + if (dev_priv->display.hpd_irq_setup) + dev_priv->display.hpd_irq_setup(dev); + spin_unlock_irq(&dev_priv->irq_lock); +} + +/** + * intel_irq_install - enables the hardware interrupt + * @dev_priv: i915 device instance + * + * This function enables the hardware interrupt handling, but leaves the hotplug + * handling still disabled. It is called after intel_irq_init(). + * + * In the driver load and resume code we need working interrupts in a few places + * but don't want to deal with the hassle of concurrent probe and hotplug + * workers. Hence the split into this two-stage approach. + */ +int intel_irq_install(struct drm_i915_private *dev_priv) +{ + /* + * We enable some interrupt sources in our postinstall hooks, so mark + * interrupts as enabled _before_ actually enabling them to avoid + * special cases in our ordering checks. + */ + dev_priv->pm.irqs_enabled = true; + + return drm_irq_install(dev_priv->dev, dev_priv->dev->pdev->irq); +} + +/** + * intel_irq_uninstall - finilizes all irq handling + * @dev_priv: i915 device instance + * + * This stops interrupt and hotplug handling and unregisters and frees all + * resources acquired in the init functions. + */ +void intel_irq_uninstall(struct drm_i915_private *dev_priv) +{ + drm_irq_uninstall(dev_priv->dev); + intel_hpd_cancel_work(dev_priv); + dev_priv->pm.irqs_enabled = false; +} + +/** + * intel_runtime_pm_disable_interrupts - runtime interrupt disabling + * @dev_priv: i915 device instance + * + * This function is used to disable interrupts at runtime, both in the runtime + * pm and the system suspend/resume code. + */ +void intel_runtime_pm_disable_interrupts(struct drm_i915_private *dev_priv) +{ + dev_priv->dev->driver->irq_uninstall(dev_priv->dev); + dev_priv->pm.irqs_enabled = false; + synchronize_irq(dev_priv->dev->irq); +} + +/** + * intel_runtime_pm_enable_interrupts - runtime interrupt enabling + * @dev_priv: i915 device instance + * + * This function is used to enable interrupts at runtime, both in the runtime + * pm and the system suspend/resume code. + */ +void intel_runtime_pm_enable_interrupts(struct drm_i915_private *dev_priv) +{ + dev_priv->pm.irqs_enabled = true; + dev_priv->dev->driver->irq_preinstall(dev_priv->dev); + dev_priv->dev->driver->irq_postinstall(dev_priv->dev); +} |