/* * AGPGART driver backend routines. * Copyright (C) 2004 Silicon Graphics, Inc. * Copyright (C) 2002-2003 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, DAVE JONES, 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/init.h> #include <linux/slab.h> #include <linux/pagemap.h> #include <linux/miscdevice.h> #include <linux/pm.h> #include <linux/agp_backend.h> #include <linux/agpgart.h> #include <linux/vmalloc.h> #include <asm/io.h> #include "agp.h" /* Due to XFree86 brain-damage, we can't go to 1.0 until they * fix some real stupidity. It's only by chance we can bump * past 0.99 at all due to some boolean logic error. */ #define AGPGART_VERSION_MAJOR 0 #define AGPGART_VERSION_MINOR 103 static const struct agp_version agp_current_version = { .major = AGPGART_VERSION_MAJOR, .minor = AGPGART_VERSION_MINOR, }; struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = &agp_generic_find_bridge; struct agp_bridge_data *agp_bridge; LIST_HEAD(agp_bridges); EXPORT_SYMBOL(agp_bridge); EXPORT_SYMBOL(agp_bridges); EXPORT_SYMBOL(agp_find_bridge); /** * agp_backend_acquire - attempt to acquire an agp backend. * */ struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev) { struct agp_bridge_data *bridge; bridge = agp_find_bridge(pdev); if (!bridge) return NULL; if (atomic_read(&bridge->agp_in_use)) return NULL; atomic_inc(&bridge->agp_in_use); return bridge; } EXPORT_SYMBOL(agp_backend_acquire); /** * agp_backend_release - release the lock on the agp backend. * * The caller must insure that the graphics aperture translation table * is read for use by another entity. * * (Ensure that all memory it bound is unbound.) */ void agp_backend_release(struct agp_bridge_data *bridge) { if (bridge) atomic_dec(&bridge->agp_in_use); } EXPORT_SYMBOL(agp_backend_release); static const struct { int mem, agp; } maxes_table[] = { {0, 0}, {32, 4}, {64, 28}, {128, 96}, {256, 204}, {512, 440}, {1024, 942}, {2048, 1920}, {4096, 3932} }; static int agp_find_max(void) { long memory, index, result; #if PAGE_SHIFT < 20 memory = totalram_pages >> (20 - PAGE_SHIFT); #else memory = totalram_pages << (PAGE_SHIFT - 20); #endif index = 1; while ((memory > maxes_table[index].mem) && (index < 8)) index++; result = maxes_table[index - 1].agp + ( (memory - maxes_table[index - 1].mem) * (maxes_table[index].agp - maxes_table[index - 1].agp)) / (maxes_table[index].mem - maxes_table[index - 1].mem); result = result << (20 - PAGE_SHIFT); return result; } static int agp_backend_initialize(struct agp_bridge_data *bridge) { int size_value, rc, got_gatt=0, got_keylist=0; bridge->max_memory_agp = agp_find_max(); bridge->version = &agp_current_version; if (bridge->driver->needs_scratch_page) { struct page *page = bridge->driver->agp_alloc_page(bridge); if (!page) { dev_err(&bridge->dev->dev, "can't get memory for scratch page\n"); return -ENOMEM; } bridge->scratch_page_page = page; bridge->scratch_page_dma = page_to_phys(page); bridge->scratch_page = bridge->driver->mask_memory(bridge, bridge->scratch_page_dma, 0); } size_value = bridge->driver->fetch_size(); if (size_value == 0) { dev_err(&bridge->dev->dev, "can't determine aperture size\n"); rc = -EINVAL; goto err_out; } if (bridge->driver->create_gatt_table(bridge)) { dev_err(&bridge->dev->dev, "can't get memory for graphics translation table\n"); rc = -ENOMEM; goto err_out; } got_gatt = 1; bridge->key_list = vzalloc(PAGE_SIZE * 4); if (bridge->key_list == NULL) { dev_err(&bridge->dev->dev, "can't allocate memory for key lists\n"); rc = -ENOMEM; goto err_out; } got_keylist = 1; /* FIXME vmalloc'd memory not guaranteed contiguous */ if (bridge->driver->configure()) { dev_err(&bridge->dev->dev, "error configuring host chipset\n"); rc = -EINVAL; goto err_out; } INIT_LIST_HEAD(&bridge->mapped_list); spin_lock_init(&bridge->mapped_lock); return 0; err_out: if (bridge->driver->needs_scratch_page) { struct page *page = bridge->scratch_page_page; bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); } if (got_gatt) bridge->driver->free_gatt_table(bridge); if (got_keylist) { vfree(bridge->key_list); bridge->key_list = NULL; } return rc; } /* cannot be __exit b/c as it could be called from __init code */ static void agp_backend_cleanup(struct agp_bridge_data *bridge) { if (bridge->driver->cleanup) bridge->driver->cleanup(); if (bridge->driver->free_gatt_table) bridge->driver->free_gatt_table(bridge); vfree(bridge->key_list); bridge->key_list = NULL; if (bridge->driver->agp_destroy_page && bridge->driver->needs_scratch_page) { struct page *page = bridge->scratch_page_page; bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); } } /* 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_alloc_bridge(void) { struct agp_bridge_data *bridge; bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); if (!bridge) return NULL; atomic_set(&bridge->agp_in_use, 0); atomic_set(&bridge->current_memory_agp, 0); if (list_empty(&agp_bridges)) agp_bridge = bridge; return bridge; } EXPORT_SYMBOL(agp_alloc_bridge); void agp_put_bridge(struct agp_bridge_data *bridge) { kfree(bridge); if (list_empty(&agp_bridges)) agp_bridge = NULL; } EXPORT_SYMBOL(agp_put_bridge); int agp_add_bridge(struct agp_bridge_data *bridge) { int error; if (agp_off) { error = -ENODEV; goto err_put_bridge; } if (!bridge->dev) { printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); error = -EINVAL; goto err_put_bridge; } /* Grab reference on the chipset driver. */ if (!try_module_get(bridge->driver->owner)) { dev_info(&bridge->dev->dev, "can't lock chipset driver\n"); error = -EINVAL; goto err_put_bridge; } error = agp_backend_initialize(bridge); if (error) { dev_info(&bridge->dev->dev, "agp_backend_initialize() failed\n"); goto err_out; } if (list_empty(&agp_bridges)) { error = agp_frontend_initialize(); if (error) { dev_info(&bridge->dev->dev, "agp_frontend_initialize() failed\n"); goto frontend_err; } dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n", bridge->driver->fetch_size(), bridge->gart_bus_addr); } list_add(&bridge->list, &agp_bridges); return 0; frontend_err: agp_backend_cleanup(bridge); err_out: module_put(bridge->driver->owner); err_put_bridge: agp_put_bridge(bridge); return error; } EXPORT_SYMBOL_GPL(agp_add_bridge); void agp_remove_bridge(struct agp_bridge_data *bridge) { agp_backend_cleanup(bridge); list_del(&bridge->list); if (list_empty(&agp_bridges)) agp_frontend_cleanup(); module_put(bridge->driver->owner); } EXPORT_SYMBOL_GPL(agp_remove_bridge); int agp_off; int agp_try_unsupported_boot; EXPORT_SYMBOL(agp_off); EXPORT_SYMBOL(agp_try_unsupported_boot); static int __init agp_init(void) { if (!agp_off) printk(KERN_INFO "Linux agpgart interface v%d.%d\n", AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); return 0; } static void __exit agp_exit(void) { } #ifndef MODULE static __init int agp_setup(char *s) { if (!strcmp(s,"off")) agp_off = 1; if (!strcmp(s,"try_unsupported")) agp_try_unsupported_boot = 1; return 1; } __setup("agp=", agp_setup); #endif MODULE_AUTHOR("Dave Jones, Jeff Hartmann"); MODULE_DESCRIPTION("AGP GART driver"); MODULE_LICENSE("GPL and additional rights"); MODULE_ALIAS_MISCDEV(AGPGART_MINOR); module_init(agp_init); module_exit(agp_exit);