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-rw-r--r--drivers/gpu/drm/drm_irq.c73
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_display.c8
-rw-r--r--drivers/gpu/drm/radeon/radeon_pm.c8
3 files changed, 80 insertions, 9 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 607f493ae..809098918 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -221,6 +221,64 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
}
+ /*
+ * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
+ * interval? If so then vblank irqs keep running and it will likely
+ * happen that the hardware vblank counter is not trustworthy as it
+ * might reset at some point in that interval and vblank timestamps
+ * are not trustworthy either in that interval. Iow. this can result
+ * in a bogus diff >> 1 which must be avoided as it would cause
+ * random large forward jumps of the software vblank counter.
+ */
+ if (diff > 1 && (vblank->inmodeset & 0x2)) {
+ DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
+ " due to pre-modeset.\n", pipe, diff);
+ diff = 1;
+ }
+
+ /*
+ * FIMXE: Need to replace this hack with proper seqlocks.
+ *
+ * Restrict the bump of the software vblank counter to a safe maximum
+ * value of +1 whenever there is the possibility that concurrent readers
+ * of vblank timestamps could be active at the moment, as the current
+ * implementation of the timestamp caching and updating is not safe
+ * against concurrent readers for calls to store_vblank() with a bump
+ * of anything but +1. A bump != 1 would very likely return corrupted
+ * timestamps to userspace, because the same slot in the cache could
+ * be concurrently written by store_vblank() and read by one of those
+ * readers without the read-retry logic detecting the collision.
+ *
+ * Concurrent readers can exist when we are called from the
+ * drm_vblank_off() or drm_vblank_on() functions and other non-vblank-
+ * irq callers. However, all those calls to us are happening with the
+ * vbl_lock locked to prevent drm_vblank_get(), so the vblank refcount
+ * can't increase while we are executing. Therefore a zero refcount at
+ * this point is safe for arbitrary counter bumps if we are called
+ * outside vblank irq, a non-zero count is not 100% safe. Unfortunately
+ * we must also accept a refcount of 1, as whenever we are called from
+ * drm_vblank_get() -> drm_vblank_enable() the refcount will be 1 and
+ * we must let that one pass through in order to not lose vblank counts
+ * during vblank irq off - which would completely defeat the whole
+ * point of this routine.
+ *
+ * Whenever we are called from vblank irq, we have to assume concurrent
+ * readers exist or can show up any time during our execution, even if
+ * the refcount is currently zero, as vblank irqs are usually only
+ * enabled due to the presence of readers, and because when we are called
+ * from vblank irq we can't hold the vbl_lock to protect us from sudden
+ * bumps in vblank refcount. Therefore also restrict bumps to +1 when
+ * called from vblank irq.
+ */
+ if ((diff > 1) && (atomic_read(&vblank->refcount) > 1 ||
+ (flags & DRM_CALLED_FROM_VBLIRQ))) {
+ DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u "
+ "refcount %u, vblirq %u\n", pipe, diff,
+ atomic_read(&vblank->refcount),
+ (flags & DRM_CALLED_FROM_VBLIRQ) != 0);
+ diff = 1;
+ }
+
DRM_DEBUG_VBL("updating vblank count on crtc %u:"
" current=%u, diff=%u, hw=%u hw_last=%u\n",
pipe, vblank->count, diff, cur_vblank, vblank->last);
@@ -1313,7 +1371,13 @@ void drm_vblank_off(struct drm_device *dev, unsigned int pipe)
spin_lock_irqsave(&dev->event_lock, irqflags);
spin_lock(&dev->vbl_lock);
- vblank_disable_and_save(dev, pipe);
+ DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
+ pipe, vblank->enabled, vblank->inmodeset);
+
+ /* Avoid redundant vblank disables without previous drm_vblank_on(). */
+ if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset)
+ vblank_disable_and_save(dev, pipe);
+
wake_up(&vblank->queue);
/*
@@ -1415,6 +1479,9 @@ void drm_vblank_on(struct drm_device *dev, unsigned int pipe)
return;
spin_lock_irqsave(&dev->vbl_lock, irqflags);
+ DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
+ pipe, vblank->enabled, vblank->inmodeset);
+
/* Drop our private "prevent drm_vblank_get" refcount */
if (vblank->inmodeset) {
atomic_dec(&vblank->refcount);
@@ -1427,8 +1494,7 @@ void drm_vblank_on(struct drm_device *dev, unsigned int pipe)
* re-enable interrupts if there are users left, or the
* user wishes vblank interrupts to be enabled all the time.
*/
- if (atomic_read(&vblank->refcount) != 0 ||
- (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0))
+ if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0)
WARN_ON(drm_vblank_enable(dev, pipe));
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
}
@@ -1523,6 +1589,7 @@ void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe)
if (vblank->inmodeset) {
spin_lock_irqsave(&dev->vbl_lock, irqflags);
dev->vblank_disable_allowed = true;
+ drm_reset_vblank_timestamp(dev, pipe);
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
if (vblank->inmodeset & 0x2)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 64c8d932d..58a3f7cf2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -634,10 +634,6 @@ nouveau_display_resume(struct drm_device *dev, bool runtime)
nv_crtc->lut.depth = 0;
}
- /* Make sure that drm and hw vblank irqs get resumed if needed. */
- for (head = 0; head < dev->mode_config.num_crtc; head++)
- drm_vblank_on(dev, head);
-
/* This should ensure we don't hit a locking problem when someone
* wakes us up via a connector. We should never go into suspend
* while the display is on anyways.
@@ -647,6 +643,10 @@ nouveau_display_resume(struct drm_device *dev, bool runtime)
drm_helper_resume_force_mode(dev);
+ /* Make sure that drm and hw vblank irqs get resumed if needed. */
+ for (head = 0; head < dev->mode_config.num_crtc; head++)
+ drm_vblank_on(dev, head);
+
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 59abebd6b..a94979f59 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -276,8 +276,12 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev)
if (rdev->irq.installed) {
for (i = 0; i < rdev->num_crtc; i++) {
if (rdev->pm.active_crtcs & (1 << i)) {
- rdev->pm.req_vblank |= (1 << i);
- drm_vblank_get(rdev->ddev, i);
+ /* This can fail if a modeset is in progress */
+ if (drm_vblank_get(rdev->ddev, i) == 0)
+ rdev->pm.req_vblank |= (1 << i);
+ else
+ DRM_DEBUG_DRIVER("crtc %d no vblank, can glitch\n",
+ i);
}
}
}