diff options
Diffstat (limited to 'drivers/char/agp/generic.c')
| -rw-r--r-- | drivers/char/agp/generic.c | 1424 |
1 files changed, 1424 insertions, 0 deletions
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c new file mode 100644 index 000000000..f002fa5d1 --- /dev/null +++ b/drivers/char/agp/generic.c @@ -0,0 +1,1424 @@ +/* + * AGPGART driver. + * Copyright (C) 2004 Silicon Graphics, Inc. + * Copyright (C) 2002-2005 Dave Jones. + * Copyright (C) 1999 Jeff Hartmann. + * Copyright (C) 1999 Precision Insight, Inc. + * Copyright (C) 1999 Xi Graphics, Inc. + * + * 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, sublicense, + * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL + * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS 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. + * + * TODO: + * - Allocate more than order 0 pages to avoid too much linear map splitting. + */ +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/pagemap.h> +#include <linux/miscdevice.h> +#include <linux/pm.h> +#include <linux/agp_backend.h> +#include <linux/vmalloc.h> +#include <linux/dma-mapping.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <asm/io.h> +#include <asm/cacheflush.h> +#include <asm/pgtable.h> +#include "agp.h" + +__u32 *agp_gatt_table; +int agp_memory_reserved; + +/* + * Needed by the Nforce GART driver for the time being. Would be + * nice to do this some other way instead of needing this export. + */ +EXPORT_SYMBOL_GPL(agp_memory_reserved); + +/* + * Generic routines for handling agp_memory structures - + * They use the basic page allocation routines to do the brunt of the work. + */ + +void agp_free_key(int key) +{ + if (key < 0) + return; + + if (key < MAXKEY) + clear_bit(key, agp_bridge->key_list); +} +EXPORT_SYMBOL(agp_free_key); + + +static int agp_get_key(void) +{ + int bit; + + bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY); + if (bit < MAXKEY) { + set_bit(bit, agp_bridge->key_list); + return bit; + } + return -1; +} + +/* + * Use kmalloc if possible for the page list. Otherwise fall back to + * vmalloc. This speeds things up and also saves memory for small AGP + * regions. + */ + +void agp_alloc_page_array(size_t size, struct agp_memory *mem) +{ + mem->pages = NULL; + + if (size <= 2*PAGE_SIZE) + mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN); + if (mem->pages == NULL) { + mem->pages = vmalloc(size); + } +} +EXPORT_SYMBOL(agp_alloc_page_array); + +static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages) +{ + struct agp_memory *new; + unsigned long alloc_size = num_agp_pages*sizeof(struct page *); + + if (INT_MAX/sizeof(struct page *) < num_agp_pages) + return NULL; + + new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL); + if (new == NULL) + return NULL; + + new->key = agp_get_key(); + + if (new->key < 0) { + kfree(new); + return NULL; + } + + agp_alloc_page_array(alloc_size, new); + + if (new->pages == NULL) { + agp_free_key(new->key); + kfree(new); + return NULL; + } + new->num_scratch_pages = 0; + return new; +} + +struct agp_memory *agp_create_memory(int scratch_pages) +{ + struct agp_memory *new; + + new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL); + if (new == NULL) + return NULL; + + new->key = agp_get_key(); + + if (new->key < 0) { + kfree(new); + return NULL; + } + + agp_alloc_page_array(PAGE_SIZE * scratch_pages, new); + + if (new->pages == NULL) { + agp_free_key(new->key); + kfree(new); + return NULL; + } + new->num_scratch_pages = scratch_pages; + new->type = AGP_NORMAL_MEMORY; + return new; +} +EXPORT_SYMBOL(agp_create_memory); + +/** + * agp_free_memory - free memory associated with an agp_memory pointer. + * + * @curr: agp_memory pointer to be freed. + * + * It is the only function that can be called when the backend is not owned + * by the caller. (So it can free memory on client death.) + */ +void agp_free_memory(struct agp_memory *curr) +{ + size_t i; + + if (curr == NULL) + return; + + if (curr->is_bound) + agp_unbind_memory(curr); + + if (curr->type >= AGP_USER_TYPES) { + agp_generic_free_by_type(curr); + return; + } + + if (curr->type != 0) { + curr->bridge->driver->free_by_type(curr); + return; + } + if (curr->page_count != 0) { + if (curr->bridge->driver->agp_destroy_pages) { + curr->bridge->driver->agp_destroy_pages(curr); + } else { + + for (i = 0; i < curr->page_count; i++) { + curr->bridge->driver->agp_destroy_page( + curr->pages[i], + AGP_PAGE_DESTROY_UNMAP); + } + for (i = 0; i < curr->page_count; i++) { + curr->bridge->driver->agp_destroy_page( + curr->pages[i], + AGP_PAGE_DESTROY_FREE); + } + } + } + agp_free_key(curr->key); + agp_free_page_array(curr); + kfree(curr); +} +EXPORT_SYMBOL(agp_free_memory); + +#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long)) + +/** + * agp_allocate_memory - allocate a group of pages of a certain type. + * + * @page_count: size_t argument of the number of pages + * @type: u32 argument of the type of memory to be allocated. + * + * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which + * maps to physical ram. Any other type is device dependent. + * + * It returns NULL whenever memory is unavailable. + */ +struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge, + size_t page_count, u32 type) +{ + int scratch_pages; + struct agp_memory *new; + size_t i; + int cur_memory; + + if (!bridge) + return NULL; + + cur_memory = atomic_read(&bridge->current_memory_agp); + if ((cur_memory + page_count > bridge->max_memory_agp) || + (cur_memory + page_count < page_count)) + return NULL; + + if (type >= AGP_USER_TYPES) { + new = agp_generic_alloc_user(page_count, type); + if (new) + new->bridge = bridge; + return new; + } + + if (type != 0) { + new = bridge->driver->alloc_by_type(page_count, type); + if (new) + new->bridge = bridge; + return new; + } + + scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE; + + new = agp_create_memory(scratch_pages); + + if (new == NULL) + return NULL; + + if (bridge->driver->agp_alloc_pages) { + if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) { + agp_free_memory(new); + return NULL; + } + new->bridge = bridge; + return new; + } + + for (i = 0; i < page_count; i++) { + struct page *page = bridge->driver->agp_alloc_page(bridge); + + if (page == NULL) { + agp_free_memory(new); + return NULL; + } + new->pages[i] = page; + new->page_count++; + } + new->bridge = bridge; + + return new; +} +EXPORT_SYMBOL(agp_allocate_memory); + + +/* End - Generic routines for handling agp_memory structures */ + + +static int agp_return_size(void) +{ + int current_size; + void *temp; + + temp = agp_bridge->current_size; + + switch (agp_bridge->driver->size_type) { + case U8_APER_SIZE: + current_size = A_SIZE_8(temp)->size; + break; + case U16_APER_SIZE: + current_size = A_SIZE_16(temp)->size; + break; + case U32_APER_SIZE: + current_size = A_SIZE_32(temp)->size; + break; + case LVL2_APER_SIZE: + current_size = A_SIZE_LVL2(temp)->size; + break; + case FIXED_APER_SIZE: + current_size = A_SIZE_FIX(temp)->size; + break; + default: + current_size = 0; + break; + } + + current_size -= (agp_memory_reserved / (1024*1024)); + if (current_size <0) + current_size = 0; + return current_size; +} + + +int agp_num_entries(void) +{ + int num_entries; + void *temp; + + temp = agp_bridge->current_size; + + switch (agp_bridge->driver->size_type) { + case U8_APER_SIZE: + num_entries = A_SIZE_8(temp)->num_entries; + break; + case U16_APER_SIZE: + num_entries = A_SIZE_16(temp)->num_entries; + break; + case U32_APER_SIZE: + num_entries = A_SIZE_32(temp)->num_entries; + break; + case LVL2_APER_SIZE: + num_entries = A_SIZE_LVL2(temp)->num_entries; + break; + case FIXED_APER_SIZE: + num_entries = A_SIZE_FIX(temp)->num_entries; + break; + default: + num_entries = 0; + break; + } + + num_entries -= agp_memory_reserved>>PAGE_SHIFT; + if (num_entries<0) + num_entries = 0; + return num_entries; +} +EXPORT_SYMBOL_GPL(agp_num_entries); + + +/** + * agp_copy_info - copy bridge state information + * + * @info: agp_kern_info pointer. The caller should insure that this pointer is valid. + * + * This function copies information about the agp bridge device and the state of + * the agp backend into an agp_kern_info pointer. + */ +int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info) +{ + memset(info, 0, sizeof(struct agp_kern_info)); + if (!bridge) { + info->chipset = NOT_SUPPORTED; + return -EIO; + } + + info->version.major = bridge->version->major; + info->version.minor = bridge->version->minor; + info->chipset = SUPPORTED; + info->device = bridge->dev; + if (bridge->mode & AGPSTAT_MODE_3_0) + info->mode = bridge->mode & ~AGP3_RESERVED_MASK; + else + info->mode = bridge->mode & ~AGP2_RESERVED_MASK; + info->aper_base = bridge->gart_bus_addr; + info->aper_size = agp_return_size(); + info->max_memory = bridge->max_memory_agp; + info->current_memory = atomic_read(&bridge->current_memory_agp); + info->cant_use_aperture = bridge->driver->cant_use_aperture; + info->vm_ops = bridge->vm_ops; + info->page_mask = ~0UL; + return 0; +} +EXPORT_SYMBOL(agp_copy_info); + +/* End - Routine to copy over information structure */ + +/* + * Routines for handling swapping of agp_memory into the GATT - + * These routines take agp_memory and insert them into the GATT. + * They call device specific routines to actually write to the GATT. + */ + +/** + * agp_bind_memory - Bind an agp_memory structure into the GATT. + * + * @curr: agp_memory pointer + * @pg_start: an offset into the graphics aperture translation table + * + * It returns -EINVAL if the pointer == NULL. + * It returns -EBUSY if the area of the table requested is already in use. + */ +int agp_bind_memory(struct agp_memory *curr, off_t pg_start) +{ + int ret_val; + + if (curr == NULL) + return -EINVAL; + + if (curr->is_bound) { + printk(KERN_INFO PFX "memory %p is already bound!\n", curr); + return -EINVAL; + } + if (!curr->is_flushed) { + curr->bridge->driver->cache_flush(); + curr->is_flushed = true; + } + + ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type); + + if (ret_val != 0) + return ret_val; + + curr->is_bound = true; + curr->pg_start = pg_start; + spin_lock(&agp_bridge->mapped_lock); + list_add(&curr->mapped_list, &agp_bridge->mapped_list); + spin_unlock(&agp_bridge->mapped_lock); + + return 0; +} +EXPORT_SYMBOL(agp_bind_memory); + + +/** + * agp_unbind_memory - Removes an agp_memory structure from the GATT + * + * @curr: agp_memory pointer to be removed from the GATT. + * + * It returns -EINVAL if this piece of agp_memory is not currently bound to + * the graphics aperture translation table or if the agp_memory pointer == NULL + */ +int agp_unbind_memory(struct agp_memory *curr) +{ + int ret_val; + + if (curr == NULL) + return -EINVAL; + + if (!curr->is_bound) { + printk(KERN_INFO PFX "memory %p was not bound!\n", curr); + return -EINVAL; + } + + ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type); + + if (ret_val != 0) + return ret_val; + + curr->is_bound = false; + curr->pg_start = 0; + spin_lock(&curr->bridge->mapped_lock); + list_del(&curr->mapped_list); + spin_unlock(&curr->bridge->mapped_lock); + return 0; +} +EXPORT_SYMBOL(agp_unbind_memory); + + +/* End - Routines for handling swapping of agp_memory into the GATT */ + + +/* Generic Agp routines - Start */ +static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat) +{ + u32 tmp; + + if (*requested_mode & AGP2_RESERVED_MASK) { + printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n", + *requested_mode & AGP2_RESERVED_MASK, *requested_mode); + *requested_mode &= ~AGP2_RESERVED_MASK; + } + + /* + * Some dumb bridges are programmed to disobey the AGP2 spec. + * This is likely a BIOS misprogramming rather than poweron default, or + * it would be a lot more common. + * https://bugs.freedesktop.org/show_bug.cgi?id=8816 + * AGPv2 spec 6.1.9 states: + * The RATE field indicates the data transfer rates supported by this + * device. A.G.P. devices must report all that apply. + * Fix them up as best we can. + */ + switch (*bridge_agpstat & 7) { + case 4: + *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X); + printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. " + "Fixing up support for x2 & x1\n"); + break; + case 2: + *bridge_agpstat |= AGPSTAT2_1X; + printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. " + "Fixing up support for x1\n"); + break; + default: + break; + } + + /* Check the speed bits make sense. Only one should be set. */ + tmp = *requested_mode & 7; + switch (tmp) { + case 0: + printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm); + *requested_mode |= AGPSTAT2_1X; + break; + case 1: + case 2: + break; + case 3: + *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */ + break; + case 4: + break; + case 5: + case 6: + case 7: + *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/ + break; + } + + /* disable SBA if it's not supported */ + if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA))) + *bridge_agpstat &= ~AGPSTAT_SBA; + + /* Set rate */ + if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X))) + *bridge_agpstat &= ~AGPSTAT2_4X; + + if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X))) + *bridge_agpstat &= ~AGPSTAT2_2X; + + if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X))) + *bridge_agpstat &= ~AGPSTAT2_1X; + + /* Now we know what mode it should be, clear out the unwanted bits. */ + if (*bridge_agpstat & AGPSTAT2_4X) + *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */ + + if (*bridge_agpstat & AGPSTAT2_2X) + *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */ + + if (*bridge_agpstat & AGPSTAT2_1X) + *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */ + + /* Apply any errata. */ + if (agp_bridge->flags & AGP_ERRATA_FASTWRITES) + *bridge_agpstat &= ~AGPSTAT_FW; + + if (agp_bridge->flags & AGP_ERRATA_SBA) + *bridge_agpstat &= ~AGPSTAT_SBA; + + if (agp_bridge->flags & AGP_ERRATA_1X) { + *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); + *bridge_agpstat |= AGPSTAT2_1X; + } + + /* If we've dropped down to 1X, disable fast writes. */ + if (*bridge_agpstat & AGPSTAT2_1X) + *bridge_agpstat &= ~AGPSTAT_FW; +} + +/* + * requested_mode = Mode requested by (typically) X. + * bridge_agpstat = PCI_AGP_STATUS from agp bridge. + * vga_agpstat = PCI_AGP_STATUS from graphic card. + */ +static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat) +{ + u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat; + u32 tmp; + + if (*requested_mode & AGP3_RESERVED_MASK) { + printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n", + *requested_mode & AGP3_RESERVED_MASK, *requested_mode); + *requested_mode &= ~AGP3_RESERVED_MASK; + } + + /* Check the speed bits make sense. */ + tmp = *requested_mode & 7; + if (tmp == 0) { + printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm); + *requested_mode |= AGPSTAT3_4X; + } + if (tmp >= 3) { + printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4); + *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X; + } + + /* ARQSZ - Set the value to the maximum one. + * Don't allow the mode register to override values. */ + *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) | + max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ))); + + /* Calibration cycle. + * Don't allow the mode register to override values. */ + *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) | + min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK))); + + /* SBA *must* be supported for AGP v3 */ + *bridge_agpstat |= AGPSTAT_SBA; + + /* + * Set speed. + * Check for invalid speeds. This can happen when applications + * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware + */ + if (*requested_mode & AGPSTAT_MODE_3_0) { + /* + * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode, + * have been passed a 3.0 mode, but with 2.x speed bits set. + * AGP2.x 4x -> AGP3.0 4x. + */ + if (*requested_mode & AGPSTAT2_4X) { + printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n", + current->comm, *requested_mode); + *requested_mode &= ~AGPSTAT2_4X; + *requested_mode |= AGPSTAT3_4X; + } + } else { + /* + * The caller doesn't know what they are doing. We are in 3.0 mode, + * but have been passed an AGP 2.x mode. + * Convert AGP 1x,2x,4x -> AGP 3.0 4x. + */ + printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n", + current->comm, *requested_mode); + *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X); + *requested_mode |= AGPSTAT3_4X; + } + + if (*requested_mode & AGPSTAT3_8X) { + if (!(*bridge_agpstat & AGPSTAT3_8X)) { + *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD); + *bridge_agpstat |= AGPSTAT3_4X; + printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm); + return; + } + if (!(*vga_agpstat & AGPSTAT3_8X)) { + *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD); + *bridge_agpstat |= AGPSTAT3_4X; + printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm); + return; + } + /* All set, bridge & device can do AGP x8*/ + *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD); + goto done; + + } else if (*requested_mode & AGPSTAT3_4X) { + *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD); + *bridge_agpstat |= AGPSTAT3_4X; + goto done; + + } else { + + /* + * If we didn't specify an AGP mode, we see if both + * the graphics card, and the bridge can do x8, and use if so. + * If not, we fall back to x4 mode. + */ + if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) { + printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode " + "supported by bridge & card (x8).\n"); + *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD); + *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD); + } else { + printk(KERN_INFO PFX "Fell back to AGPx4 mode because "); + if (!(*bridge_agpstat & AGPSTAT3_8X)) { + printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n", + *bridge_agpstat, origbridge); + *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD); + *bridge_agpstat |= AGPSTAT3_4X; + } + if (!(*vga_agpstat & AGPSTAT3_8X)) { + printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n", + *vga_agpstat, origvga); + *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD); + *vga_agpstat |= AGPSTAT3_4X; + } + } + } + +done: + /* Apply any errata. */ + if (agp_bridge->flags & AGP_ERRATA_FASTWRITES) + *bridge_agpstat &= ~AGPSTAT_FW; + + if (agp_bridge->flags & AGP_ERRATA_SBA) + *bridge_agpstat &= ~AGPSTAT_SBA; + + if (agp_bridge->flags & AGP_ERRATA_1X) { + *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); + *bridge_agpstat |= AGPSTAT2_1X; + } +} + + +/** + * agp_collect_device_status - determine correct agp_cmd from various agp_stat's + * @bridge: an agp_bridge_data struct allocated for the AGP host bridge. + * @requested_mode: requested agp_stat from userspace (Typically from X) + * @bridge_agpstat: current agp_stat from AGP bridge. + * + * This function will hunt for an AGP graphics card, and try to match + * the requested mode to the capabilities of both the bridge and the card. + */ +u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat) +{ + struct pci_dev *device = NULL; + u32 vga_agpstat; + u8 cap_ptr; + + for (;;) { + device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device); + if (!device) { + printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n"); + return 0; + } + cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP); + if (cap_ptr) + break; + } + + /* + * Ok, here we have a AGP device. Disable impossible + * settings, and adjust the readqueue to the minimum. + */ + pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat); + + /* adjust RQ depth */ + bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) | + min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH), + min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH)))); + + /* disable FW if it's not supported */ + if (!((bridge_agpstat & AGPSTAT_FW) && + (vga_agpstat & AGPSTAT_FW) && + (requested_mode & AGPSTAT_FW))) + bridge_agpstat &= ~AGPSTAT_FW; + + /* Check to see if we are operating in 3.0 mode */ + if (agp_bridge->mode & AGPSTAT_MODE_3_0) + agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat); + else + agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat); + + pci_dev_put(device); + return bridge_agpstat; +} +EXPORT_SYMBOL(agp_collect_device_status); + + +void agp_device_command(u32 bridge_agpstat, bool agp_v3) +{ + struct pci_dev *device = NULL; + int mode; + + mode = bridge_agpstat & 0x7; + if (agp_v3) + mode *= 4; + + for_each_pci_dev(device) { + u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP); + if (!agp) + continue; + + dev_info(&device->dev, "putting AGP V%d device into %dx mode\n", + agp_v3 ? 3 : 2, mode); + pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat); + } +} +EXPORT_SYMBOL(agp_device_command); + + +void get_agp_version(struct agp_bridge_data *bridge) +{ + u32 ncapid; + + /* Exit early if already set by errata workarounds. */ + if (bridge->major_version != 0) + return; + + pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid); + bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf; + bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf; +} +EXPORT_SYMBOL(get_agp_version); + + +void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode) +{ + u32 bridge_agpstat, temp; + + get_agp_version(agp_bridge); + + dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n", + agp_bridge->major_version, agp_bridge->minor_version); + + pci_read_config_dword(agp_bridge->dev, + agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat); + + bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat); + if (bridge_agpstat == 0) + /* Something bad happened. FIXME: Return error code? */ + return; + + bridge_agpstat |= AGPSTAT_AGP_ENABLE; + + /* Do AGP version specific frobbing. */ + if (bridge->major_version >= 3) { + if (bridge->mode & AGPSTAT_MODE_3_0) { + /* If we have 3.5, we can do the isoch stuff. */ + if (bridge->minor_version >= 5) + agp_3_5_enable(bridge); + agp_device_command(bridge_agpstat, true); + return; + } else { + /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/ + bridge_agpstat &= ~(7<<10) ; + pci_read_config_dword(bridge->dev, + bridge->capndx+AGPCTRL, &temp); + temp |= (1<<9); + pci_write_config_dword(bridge->dev, + bridge->capndx+AGPCTRL, temp); + + dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n"); + } + } + + /* AGP v<3 */ + agp_device_command(bridge_agpstat, false); +} +EXPORT_SYMBOL(agp_generic_enable); + + +int agp_generic_create_gatt_table(struct agp_bridge_data *bridge) +{ + char *table; + char *table_end; + int size; + int page_order; + int num_entries; + int i; + void *temp; + struct page *page; + + /* The generic routines can't handle 2 level gatt's */ + if (bridge->driver->size_type == LVL2_APER_SIZE) + return -EINVAL; + + table = NULL; + i = bridge->aperture_size_idx; + temp = bridge->current_size; + size = page_order = num_entries = 0; + + if (bridge->driver->size_type != FIXED_APER_SIZE) { + do { + switch (bridge->driver->size_type) { + case U8_APER_SIZE: + size = A_SIZE_8(temp)->size; + page_order = + A_SIZE_8(temp)->page_order; + num_entries = + A_SIZE_8(temp)->num_entries; + break; + case U16_APER_SIZE: + size = A_SIZE_16(temp)->size; + page_order = A_SIZE_16(temp)->page_order; + num_entries = A_SIZE_16(temp)->num_entries; + break; + case U32_APER_SIZE: + size = A_SIZE_32(temp)->size; + page_order = A_SIZE_32(temp)->page_order; + num_entries = A_SIZE_32(temp)->num_entries; + break; + /* This case will never really happen. */ + case FIXED_APER_SIZE: + case LVL2_APER_SIZE: + default: + size = page_order = num_entries = 0; + break; + } + + table = alloc_gatt_pages(page_order); + + if (table == NULL) { + i++; + switch (bridge->driver->size_type) { + case U8_APER_SIZE: + bridge->current_size = A_IDX8(bridge); + break; + case U16_APER_SIZE: + bridge->current_size = A_IDX16(bridge); + break; + case U32_APER_SIZE: + bridge->current_size = A_IDX32(bridge); + break; + /* These cases will never really happen. */ + case FIXED_APER_SIZE: + case LVL2_APER_SIZE: + default: + break; + } + temp = bridge->current_size; + } else { + bridge->aperture_size_idx = i; + } + } while (!table && (i < bridge->driver->num_aperture_sizes)); + } else { + size = ((struct aper_size_info_fixed *) temp)->size; + page_order = ((struct aper_size_info_fixed *) temp)->page_order; + num_entries = ((struct aper_size_info_fixed *) temp)->num_entries; + table = alloc_gatt_pages(page_order); + } + + if (table == NULL) + return -ENOMEM; + + table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1); + + for (page = virt_to_page(table); page <= virt_to_page(table_end); page++) + SetPageReserved(page); + + bridge->gatt_table_real = (u32 *) table; + agp_gatt_table = (void *)table; + + bridge->driver->cache_flush(); +#ifdef CONFIG_X86 + if (set_memory_uc((unsigned long)table, 1 << page_order)) + printk(KERN_WARNING "Could not set GATT table memory to UC!\n"); + + bridge->gatt_table = (u32 __iomem *)table; +#else + bridge->gatt_table = ioremap_nocache(virt_to_phys(table), + (PAGE_SIZE * (1 << page_order))); + bridge->driver->cache_flush(); +#endif + + if (bridge->gatt_table == NULL) { + for (page = virt_to_page(table); page <= virt_to_page(table_end); page++) + ClearPageReserved(page); + + free_gatt_pages(table, page_order); + + return -ENOMEM; + } + bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real); + + /* AK: bogus, should encode addresses > 4GB */ + for (i = 0; i < num_entries; i++) { + writel(bridge->scratch_page, bridge->gatt_table+i); + readl(bridge->gatt_table+i); /* PCI Posting. */ + } + + return 0; +} +EXPORT_SYMBOL(agp_generic_create_gatt_table); + +int agp_generic_free_gatt_table(struct agp_bridge_data *bridge) +{ + int page_order; + char *table, *table_end; + void *temp; + struct page *page; + + temp = bridge->current_size; + + switch (bridge->driver->size_type) { + case U8_APER_SIZE: + page_order = A_SIZE_8(temp)->page_order; + break; + case U16_APER_SIZE: + page_order = A_SIZE_16(temp)->page_order; + break; + case U32_APER_SIZE: + page_order = A_SIZE_32(temp)->page_order; + break; + case FIXED_APER_SIZE: + page_order = A_SIZE_FIX(temp)->page_order; + break; + case LVL2_APER_SIZE: + /* The generic routines can't deal with 2 level gatt's */ + return -EINVAL; + default: + page_order = 0; + break; + } + + /* Do not worry about freeing memory, because if this is + * called, then all agp memory is deallocated and removed + * from the table. */ + +#ifdef CONFIG_X86 + set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order); +#else + iounmap(bridge->gatt_table); +#endif + table = (char *) bridge->gatt_table_real; + table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1); + + for (page = virt_to_page(table); page <= virt_to_page(table_end); page++) + ClearPageReserved(page); + + free_gatt_pages(bridge->gatt_table_real, page_order); + + agp_gatt_table = NULL; + bridge->gatt_table = NULL; + bridge->gatt_table_real = NULL; + bridge->gatt_bus_addr = 0; + + return 0; +} +EXPORT_SYMBOL(agp_generic_free_gatt_table); + + +int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type) +{ + int num_entries; + size_t i; + off_t j; + void *temp; + struct agp_bridge_data *bridge; + int mask_type; + + bridge = mem->bridge; + if (!bridge) + return -EINVAL; + + if (mem->page_count == 0) + return 0; + + temp = bridge->current_size; + + switch (bridge->driver->size_type) { + case U8_APER_SIZE: + num_entries = A_SIZE_8(temp)->num_entries; + break; + case U16_APER_SIZE: + num_entries = A_SIZE_16(temp)->num_entries; + break; + case U32_APER_SIZE: + num_entries = A_SIZE_32(temp)->num_entries; + break; + case FIXED_APER_SIZE: + num_entries = A_SIZE_FIX(temp)->num_entries; + break; + case LVL2_APER_SIZE: + /* The generic routines can't deal with 2 level gatt's */ + return -EINVAL; + default: + num_entries = 0; + break; + } + + num_entries -= agp_memory_reserved/PAGE_SIZE; + if (num_entries < 0) num_entries = 0; + + if (type != mem->type) + return -EINVAL; + + mask_type = bridge->driver->agp_type_to_mask_type(bridge, type); + if (mask_type != 0) { + /* The generic routines know nothing of memory types */ + return -EINVAL; + } + + if (((pg_start + mem->page_count) > num_entries) || + ((pg_start + mem->page_count) < pg_start)) + return -EINVAL; + + j = pg_start; + + while (j < (pg_start + mem->page_count)) { + if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j))) + return -EBUSY; + j++; + } + + if (!mem->is_flushed) { + bridge->driver->cache_flush(); + mem->is_flushed = true; + } + + for (i = 0, j = pg_start; i < mem->page_count; i++, j++) { + writel(bridge->driver->mask_memory(bridge, + page_to_phys(mem->pages[i]), + mask_type), + bridge->gatt_table+j); + } + readl(bridge->gatt_table+j-1); /* PCI Posting. */ + + bridge->driver->tlb_flush(mem); + return 0; +} +EXPORT_SYMBOL(agp_generic_insert_memory); + + +int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type) +{ + size_t i; + struct agp_bridge_data *bridge; + int mask_type, num_entries; + + bridge = mem->bridge; + if (!bridge) + return -EINVAL; + + if (mem->page_count == 0) + return 0; + + if (type != mem->type) + return -EINVAL; + + num_entries = agp_num_entries(); + if (((pg_start + mem->page_count) > num_entries) || + ((pg_start + mem->page_count) < pg_start)) + return -EINVAL; + + mask_type = bridge->driver->agp_type_to_mask_type(bridge, type); + if (mask_type != 0) { + /* The generic routines know nothing of memory types */ + return -EINVAL; + } + + /* AK: bogus, should encode addresses > 4GB */ + for (i = pg_start; i < (mem->page_count + pg_start); i++) { + writel(bridge->scratch_page, bridge->gatt_table+i); + } + readl(bridge->gatt_table+i-1); /* PCI Posting. */ + + bridge->driver->tlb_flush(mem); + return 0; +} +EXPORT_SYMBOL(agp_generic_remove_memory); + +struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type) +{ + return NULL; +} +EXPORT_SYMBOL(agp_generic_alloc_by_type); + +void agp_generic_free_by_type(struct agp_memory *curr) +{ + agp_free_page_array(curr); + agp_free_key(curr->key); + kfree(curr); +} +EXPORT_SYMBOL(agp_generic_free_by_type); + +struct agp_memory *agp_generic_alloc_user(size_t page_count, int type) +{ + struct agp_memory *new; + int i; + int pages; + + pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE; + new = agp_create_user_memory(page_count); + if (new == NULL) + return NULL; + + for (i = 0; i < page_count; i++) + new->pages[i] = NULL; + new->page_count = 0; + new->type = type; + new->num_scratch_pages = pages; + + return new; +} +EXPORT_SYMBOL(agp_generic_alloc_user); + +/* + * Basic Page Allocation Routines - + * These routines handle page allocation and by default they reserve the allocated + * memory. They also handle incrementing the current_memory_agp value, Which is checked + * against a maximum value. + */ + +int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages) +{ + struct page * page; + int i, ret = -ENOMEM; + + for (i = 0; i < num_pages; i++) { + page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); + /* agp_free_memory() needs gart address */ + if (page == NULL) + goto out; + +#ifndef CONFIG_X86 + map_page_into_agp(page); +#endif + get_page(page); + atomic_inc(&agp_bridge->current_memory_agp); + + mem->pages[i] = page; + mem->page_count++; + } + +#ifdef CONFIG_X86 + set_pages_array_uc(mem->pages, num_pages); +#endif + ret = 0; +out: + return ret; +} +EXPORT_SYMBOL(agp_generic_alloc_pages); + +struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge) +{ + struct page * page; + + page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); + if (page == NULL) + return NULL; + + map_page_into_agp(page); + + get_page(page); + atomic_inc(&agp_bridge->current_memory_agp); + return page; +} +EXPORT_SYMBOL(agp_generic_alloc_page); + +void agp_generic_destroy_pages(struct agp_memory *mem) +{ + int i; + struct page *page; + + if (!mem) + return; + +#ifdef CONFIG_X86 + set_pages_array_wb(mem->pages, mem->page_count); +#endif + + for (i = 0; i < mem->page_count; i++) { + page = mem->pages[i]; + +#ifndef CONFIG_X86 + unmap_page_from_agp(page); +#endif + put_page(page); + __free_page(page); + atomic_dec(&agp_bridge->current_memory_agp); + mem->pages[i] = NULL; + } +} +EXPORT_SYMBOL(agp_generic_destroy_pages); + +void agp_generic_destroy_page(struct page *page, int flags) +{ + if (page == NULL) + return; + + if (flags & AGP_PAGE_DESTROY_UNMAP) + unmap_page_from_agp(page); + + if (flags & AGP_PAGE_DESTROY_FREE) { + put_page(page); + __free_page(page); + atomic_dec(&agp_bridge->current_memory_agp); + } +} +EXPORT_SYMBOL(agp_generic_destroy_page); + +/* End Basic Page Allocation Routines */ + + +/** + * agp_enable - initialise the agp point-to-point connection. + * + * @mode: agp mode register value to configure with. + */ +void agp_enable(struct agp_bridge_data *bridge, u32 mode) +{ + if (!bridge) + return; + bridge->driver->agp_enable(bridge, mode); +} +EXPORT_SYMBOL(agp_enable); + +/* When we remove the global variable agp_bridge from all drivers + * then agp_alloc_bridge and agp_generic_find_bridge need to be updated + */ + +struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev) +{ + if (list_empty(&agp_bridges)) + return NULL; + + return agp_bridge; +} + +static void ipi_handler(void *null) +{ + flush_agp_cache(); +} + +void global_cache_flush(void) +{ + if (on_each_cpu(ipi_handler, NULL, 1) != 0) + panic(PFX "timed out waiting for the other CPUs!\n"); +} +EXPORT_SYMBOL(global_cache_flush); + +unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge, + dma_addr_t addr, int type) +{ + /* memory type is ignored in the generic routine */ + if (bridge->driver->masks) + return addr | bridge->driver->masks[0].mask; + else + return addr; +} +EXPORT_SYMBOL(agp_generic_mask_memory); + +int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge, + int type) +{ + if (type >= AGP_USER_TYPES) + return 0; + return type; +} +EXPORT_SYMBOL(agp_generic_type_to_mask_type); + +/* + * These functions are implemented according to the AGPv3 spec, + * which covers implementation details that had previously been + * left open. + */ + +int agp3_generic_fetch_size(void) +{ + u16 temp_size; + int i; + struct aper_size_info_16 *values; + + pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size); + values = A_SIZE_16(agp_bridge->driver->aperture_sizes); + + for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) { + if (temp_size == values[i].size_value) { + agp_bridge->previous_size = + agp_bridge->current_size = (void *) (values + i); + + agp_bridge->aperture_size_idx = i; + return values[i].size; + } + } + return 0; +} +EXPORT_SYMBOL(agp3_generic_fetch_size); + +void agp3_generic_tlbflush(struct agp_memory *mem) +{ + u32 ctrl; + pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl); + pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN); + pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl); +} +EXPORT_SYMBOL(agp3_generic_tlbflush); + +int agp3_generic_configure(void) +{ + u32 temp; + struct aper_size_info_16 *current_size; + + current_size = A_SIZE_16(agp_bridge->current_size); + + agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev, + AGP_APERTURE_BAR); + + /* set aperture size */ + pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value); + /* set gart pointer */ + pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr); + /* enable aperture and GTLB */ + pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp); + pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN); + return 0; +} +EXPORT_SYMBOL(agp3_generic_configure); + +void agp3_generic_cleanup(void) +{ + u32 ctrl; + pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl); + pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB); +} +EXPORT_SYMBOL(agp3_generic_cleanup); + +const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] = +{ + {4096, 1048576, 10,0x000}, + {2048, 524288, 9, 0x800}, + {1024, 262144, 8, 0xc00}, + { 512, 131072, 7, 0xe00}, + { 256, 65536, 6, 0xf00}, + { 128, 32768, 5, 0xf20}, + { 64, 16384, 4, 0xf30}, + { 32, 8192, 3, 0xf38}, + { 16, 4096, 2, 0xf3c}, + { 8, 2048, 1, 0xf3e}, + { 4, 1024, 0, 0xf3f} +}; +EXPORT_SYMBOL(agp3_generic_sizes); + |