367 lines
8.9 KiB
C
367 lines
8.9 KiB
C
/*
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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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/* 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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* 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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