1 files changed, 455 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_agpsupport.c b/drivers/gpu/drm/drm_agpsupport.c
new file mode 100644
index 000000000000..aefa5ac4c0b1
--- /dev/null
+++ b/drivers/gpu/drm/drm_agpsupport.c
@@ -0,0 +1,455 @@
+/**
+ * \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 "drmP.h"
+#include <linux/module.h>
+
+#if __OS_HAS_AGP
+
+/**
+ * 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)
+{
+        DRM_AGP_KERN *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 alloc_agp() 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;
+        DRM_AGP_MEM *memory;
+        unsigned long pages;
+        u32 type;
+
+        if (!dev->agp || !dev->agp->acquired)
+                return -EINVAL;
+        if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
+                return -ENOMEM;
+
+        memset(entry, 0, sizeof(*entry));
+
+        pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
+        type = (u32) request->type;
+        if (!(memory = drm_alloc_agp(dev, pages, type))) {
+                drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
+                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);
+        drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
+        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.
+ */
+struct drm_agp_head *drm_agp_init(struct drm_device *dev)
+{
+        struct drm_agp_head *head = NULL;
+
+        if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
+                return NULL;
+        memset((void *)head, 0, sizeof(*head));
+        head->bridge = agp_find_bridge(dev->pdev);
+        if (!head->bridge) {
+                if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
+                        drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
+                        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) {
+                drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
+                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;
+}
+
+/** Calls agp_allocate_memory() */
+DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
+                                     size_t pages, u32 type)
+{
+        return agp_allocate_memory(bridge, pages, type);
+}
+
+/** Calls agp_free_memory() */
+int drm_agp_free_memory(DRM_AGP_MEM * handle)
+{
+        if (!handle)
+                return 0;
+        agp_free_memory(handle);
+        return 1;
+}
+
+/** Calls agp_bind_memory() */
+int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
+{
+        if (!handle)
+                return -EINVAL;
+        return agp_bind_memory(handle, start);
+}
+
+/** Calls agp_unbind_memory() */
+int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
+{
+        if (!handle)
+                return -EINVAL;
+        return agp_unbind_memory(handle);
+}
+
+#endif                          /* __OS_HAS_AGP */