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366 lines
8.9 KiB
366 lines
8.9 KiB
/* |
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* AGPGART driver backend routines. |
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* Copyright (C) 2004 Silicon Graphics, Inc. |
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* Copyright (C) 2002-2003 Dave Jones. |
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* Copyright (C) 1999 Jeff Hartmann. |
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* Copyright (C) 1999 Precision Insight, Inc. |
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* Copyright (C) 1999 Xi Graphics, Inc. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a |
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* copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included |
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* in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* JEFF HARTMANN, DAVE JONES, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, |
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE |
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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* TODO: |
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* - Allocate more than order 0 pages to avoid too much linear map splitting. |
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*/ |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/pagemap.h> |
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#include <linux/miscdevice.h> |
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#include <linux/pm.h> |
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#include <linux/agp_backend.h> |
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#include <linux/agpgart.h> |
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#include <linux/vmalloc.h> |
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#include <asm/io.h> |
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#include "agp.h" |
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|
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/* Due to XFree86 brain-damage, we can't go to 1.0 until they |
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* fix some real stupidity. It's only by chance we can bump |
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* past 0.99 at all due to some boolean logic error. */ |
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#define AGPGART_VERSION_MAJOR 0 |
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#define AGPGART_VERSION_MINOR 103 |
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static const struct agp_version agp_current_version = |
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{ |
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.major = AGPGART_VERSION_MAJOR, |
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.minor = AGPGART_VERSION_MINOR, |
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}; |
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struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = |
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&agp_generic_find_bridge; |
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struct agp_bridge_data *agp_bridge; |
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LIST_HEAD(agp_bridges); |
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EXPORT_SYMBOL(agp_bridge); |
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EXPORT_SYMBOL(agp_bridges); |
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EXPORT_SYMBOL(agp_find_bridge); |
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|
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/** |
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* agp_backend_acquire - attempt to acquire an agp backend. |
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* |
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*/ |
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struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev) |
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{ |
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struct agp_bridge_data *bridge; |
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bridge = agp_find_bridge(pdev); |
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if (!bridge) |
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return NULL; |
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if (atomic_read(&bridge->agp_in_use)) |
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return NULL; |
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atomic_inc(&bridge->agp_in_use); |
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return bridge; |
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} |
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EXPORT_SYMBOL(agp_backend_acquire); |
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/** |
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* agp_backend_release - release the lock on the agp backend. |
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* |
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* The caller must insure that the graphics aperture translation table |
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* is read for use by another entity. |
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* |
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* (Ensure that all memory it bound is unbound.) |
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*/ |
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void agp_backend_release(struct agp_bridge_data *bridge) |
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{ |
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if (bridge) |
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atomic_dec(&bridge->agp_in_use); |
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} |
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EXPORT_SYMBOL(agp_backend_release); |
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static const struct { int mem, agp; } maxes_table[] = { |
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{0, 0}, |
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{32, 4}, |
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{64, 28}, |
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{128, 96}, |
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{256, 204}, |
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{512, 440}, |
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{1024, 942}, |
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{2048, 1920}, |
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{4096, 3932} |
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}; |
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static int agp_find_max(void) |
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{ |
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long memory, index, result; |
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#if PAGE_SHIFT < 20 |
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memory = totalram_pages() >> (20 - PAGE_SHIFT); |
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#else |
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memory = totalram_pages() << (PAGE_SHIFT - 20); |
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#endif |
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index = 1; |
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while ((memory > maxes_table[index].mem) && (index < 8)) |
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index++; |
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result = maxes_table[index - 1].agp + |
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( (memory - maxes_table[index - 1].mem) * |
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(maxes_table[index].agp - maxes_table[index - 1].agp)) / |
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(maxes_table[index].mem - maxes_table[index - 1].mem); |
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result = result << (20 - PAGE_SHIFT); |
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return result; |
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} |
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static int agp_backend_initialize(struct agp_bridge_data *bridge) |
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{ |
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int size_value, rc, got_gatt=0, got_keylist=0; |
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bridge->max_memory_agp = agp_find_max(); |
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bridge->version = &agp_current_version; |
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if (bridge->driver->needs_scratch_page) { |
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struct page *page = bridge->driver->agp_alloc_page(bridge); |
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if (!page) { |
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dev_err(&bridge->dev->dev, |
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"can't get memory for scratch page\n"); |
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return -ENOMEM; |
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} |
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bridge->scratch_page_page = page; |
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bridge->scratch_page_dma = page_to_phys(page); |
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bridge->scratch_page = bridge->driver->mask_memory(bridge, |
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bridge->scratch_page_dma, 0); |
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} |
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size_value = bridge->driver->fetch_size(); |
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if (size_value == 0) { |
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dev_err(&bridge->dev->dev, "can't determine aperture size\n"); |
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rc = -EINVAL; |
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goto err_out; |
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} |
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if (bridge->driver->create_gatt_table(bridge)) { |
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dev_err(&bridge->dev->dev, |
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"can't get memory for graphics translation table\n"); |
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rc = -ENOMEM; |
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goto err_out; |
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} |
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got_gatt = 1; |
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bridge->key_list = vzalloc(PAGE_SIZE * 4); |
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if (bridge->key_list == NULL) { |
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dev_err(&bridge->dev->dev, |
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"can't allocate memory for key lists\n"); |
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rc = -ENOMEM; |
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goto err_out; |
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} |
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got_keylist = 1; |
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/* FIXME vmalloc'd memory not guaranteed contiguous */ |
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if (bridge->driver->configure()) { |
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dev_err(&bridge->dev->dev, "error configuring host chipset\n"); |
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rc = -EINVAL; |
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goto err_out; |
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} |
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INIT_LIST_HEAD(&bridge->mapped_list); |
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spin_lock_init(&bridge->mapped_lock); |
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return 0; |
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err_out: |
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if (bridge->driver->needs_scratch_page) { |
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struct page *page = bridge->scratch_page_page; |
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bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); |
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bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); |
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} |
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if (got_gatt) |
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bridge->driver->free_gatt_table(bridge); |
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if (got_keylist) { |
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vfree(bridge->key_list); |
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bridge->key_list = NULL; |
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} |
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return rc; |
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} |
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/* cannot be __exit b/c as it could be called from __init code */ |
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static void agp_backend_cleanup(struct agp_bridge_data *bridge) |
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{ |
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if (bridge->driver->cleanup) |
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bridge->driver->cleanup(); |
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if (bridge->driver->free_gatt_table) |
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bridge->driver->free_gatt_table(bridge); |
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vfree(bridge->key_list); |
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bridge->key_list = NULL; |
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if (bridge->driver->agp_destroy_page && |
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bridge->driver->needs_scratch_page) { |
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struct page *page = bridge->scratch_page_page; |
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bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); |
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bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); |
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} |
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} |
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/* When we remove the global variable agp_bridge from all drivers |
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* then agp_alloc_bridge and agp_generic_find_bridge need to be updated |
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*/ |
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struct agp_bridge_data *agp_alloc_bridge(void) |
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{ |
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struct agp_bridge_data *bridge; |
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bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); |
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if (!bridge) |
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return NULL; |
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atomic_set(&bridge->agp_in_use, 0); |
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atomic_set(&bridge->current_memory_agp, 0); |
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if (list_empty(&agp_bridges)) |
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agp_bridge = bridge; |
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return bridge; |
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} |
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EXPORT_SYMBOL(agp_alloc_bridge); |
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void agp_put_bridge(struct agp_bridge_data *bridge) |
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{ |
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kfree(bridge); |
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if (list_empty(&agp_bridges)) |
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agp_bridge = NULL; |
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} |
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EXPORT_SYMBOL(agp_put_bridge); |
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int agp_add_bridge(struct agp_bridge_data *bridge) |
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{ |
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int error; |
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if (agp_off) { |
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error = -ENODEV; |
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goto err_put_bridge; |
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} |
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if (!bridge->dev) { |
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printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); |
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error = -EINVAL; |
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goto err_put_bridge; |
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} |
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/* Grab reference on the chipset driver. */ |
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if (!try_module_get(bridge->driver->owner)) { |
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dev_info(&bridge->dev->dev, "can't lock chipset driver\n"); |
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error = -EINVAL; |
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goto err_put_bridge; |
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} |
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error = agp_backend_initialize(bridge); |
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if (error) { |
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dev_info(&bridge->dev->dev, |
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"agp_backend_initialize() failed\n"); |
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goto err_out; |
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} |
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if (list_empty(&agp_bridges)) { |
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error = agp_frontend_initialize(); |
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if (error) { |
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dev_info(&bridge->dev->dev, |
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"agp_frontend_initialize() failed\n"); |
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goto frontend_err; |
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} |
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dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n", |
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bridge->driver->fetch_size(), bridge->gart_bus_addr); |
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} |
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list_add(&bridge->list, &agp_bridges); |
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return 0; |
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frontend_err: |
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agp_backend_cleanup(bridge); |
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err_out: |
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module_put(bridge->driver->owner); |
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err_put_bridge: |
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agp_put_bridge(bridge); |
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return error; |
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} |
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EXPORT_SYMBOL_GPL(agp_add_bridge); |
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void agp_remove_bridge(struct agp_bridge_data *bridge) |
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{ |
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agp_backend_cleanup(bridge); |
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list_del(&bridge->list); |
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if (list_empty(&agp_bridges)) |
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agp_frontend_cleanup(); |
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module_put(bridge->driver->owner); |
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} |
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EXPORT_SYMBOL_GPL(agp_remove_bridge); |
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int agp_off; |
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int agp_try_unsupported_boot; |
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EXPORT_SYMBOL(agp_off); |
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EXPORT_SYMBOL(agp_try_unsupported_boot); |
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static int __init agp_init(void) |
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{ |
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if (!agp_off) |
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printk(KERN_INFO "Linux agpgart interface v%d.%d\n", |
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AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); |
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return 0; |
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} |
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static void __exit agp_exit(void) |
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{ |
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} |
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#ifndef MODULE |
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static __init int agp_setup(char *s) |
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{ |
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if (!strcmp(s,"off")) |
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agp_off = 1; |
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if (!strcmp(s,"try_unsupported")) |
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agp_try_unsupported_boot = 1; |
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return 1; |
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} |
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__setup("agp=", agp_setup); |
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#endif |
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MODULE_AUTHOR("Dave Jones, Jeff Hartmann"); |
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MODULE_DESCRIPTION("AGP GART driver"); |
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MODULE_LICENSE("GPL and additional rights"); |
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MODULE_ALIAS_MISCDEV(AGPGART_MINOR); |
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module_init(agp_init); |
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module_exit(agp_exit); |
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