--- /dev/null
+/*
+ * 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);
+
Code Review / kvmfornfv.git / blobdiff