--- /dev/null
+/**
+ * \file drm_agpsupport.c
+ * DRM support for AGP/GART backend
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * 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 (including the next
+ * paragraph) 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
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
+ */
+
+#include <drm/drmP.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "drm_legacy.h"
+
+#if __OS_HAS_AGP
+
+#include <asm/agp.h>
+
+/**
+ * Get AGP information.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a (output) drm_agp_info structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device has been initialized and acquired and fills in the
+ * drm_agp_info structure with the information in drm_agp_head::agp_info.
+ */
+int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
+{
+ struct agp_kern_info *kern;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+
+ kern = &dev->agp->agp_info;
+ info->agp_version_major = kern->version.major;
+ info->agp_version_minor = kern->version.minor;
+ info->mode = kern->mode;
+ info->aperture_base = kern->aper_base;
+ info->aperture_size = kern->aper_size * 1024 * 1024;
+ info->memory_allowed = kern->max_memory << PAGE_SHIFT;
+ info->memory_used = kern->current_memory << PAGE_SHIFT;
+ info->id_vendor = kern->device->vendor;
+ info->id_device = kern->device->device;
+
+ return 0;
+}
+
+EXPORT_SYMBOL(drm_agp_info);
+
+int drm_agp_info_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_agp_info *info = data;
+ int err;
+
+ err = drm_agp_info(dev, info);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+/**
+ * Acquire the AGP device.
+ *
+ * \param dev DRM device that is to acquire AGP.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device hasn't been acquired before and calls
+ * \c agp_backend_acquire.
+ */
+int drm_agp_acquire(struct drm_device * dev)
+{
+ if (!dev->agp)
+ return -ENODEV;
+ if (dev->agp->acquired)
+ return -EBUSY;
+ if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
+ return -ENODEV;
+ dev->agp->acquired = 1;
+ return 0;
+}
+
+EXPORT_SYMBOL(drm_agp_acquire);
+
+/**
+ * Acquire the AGP device (ioctl).
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device hasn't been acquired before and calls
+ * \c agp_backend_acquire.
+ */
+int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
+}
+
+/**
+ * Release the AGP device.
+ *
+ * \param dev DRM device that is to release AGP.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device has been acquired and calls \c agp_backend_release.
+ */
+int drm_agp_release(struct drm_device * dev)
+{
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ agp_backend_release(dev->agp->bridge);
+ dev->agp->acquired = 0;
+ return 0;
+}
+EXPORT_SYMBOL(drm_agp_release);
+
+int drm_agp_release_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ return drm_agp_release(dev);
+}
+
+/**
+ * Enable the AGP bus.
+ *
+ * \param dev DRM device that has previously acquired AGP.
+ * \param mode Requested AGP mode.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device has been acquired but not enabled, and calls
+ * \c agp_enable.
+ */
+int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
+{
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+
+ dev->agp->mode = mode.mode;
+ agp_enable(dev->agp->bridge, mode.mode);
+ dev->agp->enabled = 1;
+ return 0;
+}
+
+EXPORT_SYMBOL(drm_agp_enable);
+
+int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_agp_mode *mode = data;
+
+ return drm_agp_enable(dev, *mode);
+}
+
+/**
+ * Allocate AGP memory.
+ *
+ * \param inode device inode.
+ * \param file_priv file private pointer.
+ * \param cmd command.
+ * \param arg pointer to a drm_agp_buffer structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device is present and has been acquired, allocates the
+ * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
+ */
+int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
+{
+ struct drm_agp_mem *entry;
+ struct agp_memory *memory;
+ unsigned long pages;
+ u32 type;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (!(entry = kzalloc(sizeof(*entry), GFP_KERNEL)))
+ return -ENOMEM;
+
+ pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
+ type = (u32) request->type;
+ if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
+ kfree(entry);
+ return -ENOMEM;
+ }
+
+ entry->handle = (unsigned long)memory->key + 1;
+ entry->memory = memory;
+ entry->bound = 0;
+ entry->pages = pages;
+ list_add(&entry->head, &dev->agp->memory);
+
+ request->handle = entry->handle;
+ request->physical = memory->physical;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_agp_alloc);
+
+
+int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_agp_buffer *request = data;
+
+ return drm_agp_alloc(dev, request);
+}
+
+/**
+ * Search for the AGP memory entry associated with a handle.
+ *
+ * \param dev DRM device structure.
+ * \param handle AGP memory handle.
+ * \return pointer to the drm_agp_mem structure associated with \p handle.
+ *
+ * Walks through drm_agp_head::memory until finding a matching handle.
+ */
+static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
+ unsigned long handle)
+{
+ struct drm_agp_mem *entry;
+
+ list_for_each_entry(entry, &dev->agp->memory, head) {
+ if (entry->handle == handle)
+ return entry;
+ }
+ return NULL;
+}
+
+/**
+ * Unbind AGP memory from the GATT (ioctl).
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_agp_binding structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device is present and acquired, looks-up the AGP memory
+ * entry and passes it to the unbind_agp() function.
+ */
+int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
+{
+ struct drm_agp_mem *entry;
+ int ret;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
+ return -EINVAL;
+ if (!entry->bound)
+ return -EINVAL;
+ ret = drm_unbind_agp(entry->memory);
+ if (ret == 0)
+ entry->bound = 0;
+ return ret;
+}
+EXPORT_SYMBOL(drm_agp_unbind);
+
+
+int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_agp_binding *request = data;
+
+ return drm_agp_unbind(dev, request);
+}
+
+/**
+ * Bind AGP memory into the GATT (ioctl)
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_agp_binding structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device is present and has been acquired and that no memory
+ * is currently bound into the GATT. Looks-up the AGP memory entry and passes
+ * it to bind_agp() function.
+ */
+int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
+{
+ struct drm_agp_mem *entry;
+ int retcode;
+ int page;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
+ return -EINVAL;
+ if (entry->bound)
+ return -EINVAL;
+ page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
+ if ((retcode = drm_bind_agp(entry->memory, page)))
+ return retcode;
+ entry->bound = dev->agp->base + (page << PAGE_SHIFT);
+ DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
+ dev->agp->base, entry->bound);
+ return 0;
+}
+EXPORT_SYMBOL(drm_agp_bind);
+
+
+int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_agp_binding *request = data;
+
+ return drm_agp_bind(dev, request);
+}
+
+/**
+ * Free AGP memory (ioctl).
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_agp_buffer structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device is present and has been acquired and looks up the
+ * AGP memory entry. If the memory it's currently bound, unbind it via
+ * unbind_agp(). Frees it via free_agp() as well as the entry itself
+ * and unlinks from the doubly linked list it's inserted in.
+ */
+int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
+{
+ struct drm_agp_mem *entry;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
+ return -EINVAL;
+ if (entry->bound)
+ drm_unbind_agp(entry->memory);
+
+ list_del(&entry->head);
+
+ drm_free_agp(entry->memory, entry->pages);
+ kfree(entry);
+ return 0;
+}
+EXPORT_SYMBOL(drm_agp_free);
+
+
+
+int drm_agp_free_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_agp_buffer *request = data;
+
+ return drm_agp_free(dev, request);
+}
+
+/**
+ * Initialize the AGP resources.
+ *
+ * \return pointer to a drm_agp_head structure.
+ *
+ * Gets the drm_agp_t structure which is made available by the agpgart module
+ * via the inter_module_* functions. Creates and initializes a drm_agp_head
+ * structure.
+ *
+ * Note that final cleanup of the kmalloced structure is directly done in
+ * drm_pci_agp_destroy.
+ */
+struct drm_agp_head *drm_agp_init(struct drm_device *dev)
+{
+ struct drm_agp_head *head = NULL;
+
+ if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
+ return NULL;
+ head->bridge = agp_find_bridge(dev->pdev);
+ if (!head->bridge) {
+ if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
+ kfree(head);
+ return NULL;
+ }
+ agp_copy_info(head->bridge, &head->agp_info);
+ agp_backend_release(head->bridge);
+ } else {
+ agp_copy_info(head->bridge, &head->agp_info);
+ }
+ if (head->agp_info.chipset == NOT_SUPPORTED) {
+ kfree(head);
+ return NULL;
+ }
+ INIT_LIST_HEAD(&head->memory);
+ head->cant_use_aperture = head->agp_info.cant_use_aperture;
+ head->page_mask = head->agp_info.page_mask;
+ head->base = head->agp_info.aper_base;
+ return head;
+}
+
+/**
+ * drm_agp_clear - Clear AGP resource list
+ * @dev: DRM device
+ *
+ * Iterate over all AGP resources and remove them. But keep the AGP head
+ * intact so it can still be used. It is safe to call this if AGP is disabled or
+ * was already removed.
+ *
+ * If DRIVER_MODESET is active, nothing is done to protect the modesetting
+ * resources from getting destroyed. Drivers are responsible of cleaning them up
+ * during device shutdown.
+ */
+void drm_agp_clear(struct drm_device *dev)
+{
+ struct drm_agp_mem *entry, *tempe;
+
+ if (!dev->agp)
+ return;
+ if (drm_core_check_feature(dev, DRIVER_MODESET))
+ return;
+
+ list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
+ if (entry->bound)
+ drm_unbind_agp(entry->memory);
+ drm_free_agp(entry->memory, entry->pages);
+ kfree(entry);
+ }
+ INIT_LIST_HEAD(&dev->agp->memory);
+
+ if (dev->agp->acquired)
+ drm_agp_release(dev);
+
+ dev->agp->acquired = 0;
+ dev->agp->enabled = 0;
+}
+
+/**
+ * Binds a collection of pages into AGP memory at the given offset, returning
+ * the AGP memory structure containing them.
+ *
+ * No reference is held on the pages during this time -- it is up to the
+ * caller to handle that.
+ */
+struct agp_memory *
+drm_agp_bind_pages(struct drm_device *dev,
+ struct page **pages,
+ unsigned long num_pages,
+ uint32_t gtt_offset,
+ u32 type)
+{
+ struct agp_memory *mem;
+ int ret, i;
+
+ DRM_DEBUG("\n");
+
+ mem = agp_allocate_memory(dev->agp->bridge, num_pages,
+ type);
+ if (mem == NULL) {
+ DRM_ERROR("Failed to allocate memory for %ld pages\n",
+ num_pages);
+ return NULL;
+ }
+
+ for (i = 0; i < num_pages; i++)
+ mem->pages[i] = pages[i];
+ mem->page_count = num_pages;
+
+ mem->is_flushed = true;
+ ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
+ if (ret != 0) {
+ DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
+ agp_free_memory(mem);
+ return NULL;
+ }
+
+ return mem;
+}
+EXPORT_SYMBOL(drm_agp_bind_pages);
+
+#endif /* __OS_HAS_AGP */
Code Review / kvmfornfv.git / blobdiff