/* * 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> #ifdef CONFIG_X86 #include <asm/set_memory.h> #endif #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 = kvmalloc(size, GFP_KERNEL); } 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);