--- /dev/null
+/**
+ * \file drm_agpsupport.h
+ * 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
+
+/**
+ * AGP information ioctl.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \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 inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ DRM_AGP_KERN *kern;
+ drm_agp_info_t info;
+
+ 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;
+
+ if (copy_to_user((drm_agp_info_t __user *)arg, &info, sizeof(info)))
+ return -EFAULT;
+ return 0;
+}
+
+/**
+ * Acquire the AGP device (ioctl).
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \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
+ * agp_acquire().
+ */
+int drm_agp_acquire(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ int retcode;
+
+ if (!dev->agp)
+ return -ENODEV;
+ if (dev->agp->acquired)
+ return -EBUSY;
+ if ((retcode = agp_backend_acquire()))
+ return retcode;
+ dev->agp->acquired = 1;
+ return 0;
+}
+
+/**
+ * Release the AGP device (ioctl).
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device has been acquired and calls agp_backend_release().
+ */
+int drm_agp_release(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ agp_backend_release();
+ dev->agp->acquired = 0;
+ return 0;
+
+}
+
+/**
+ * Release the AGP device.
+ *
+ * Calls agp_backend_release().
+ */
+void drm_agp_do_release(void)
+{
+ agp_backend_release();
+}
+
+/**
+ * Enable the AGP bus.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg pointer to a drm_agp_mode structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the AGP device has been acquired but not enabled, and calls
+ * agp_enable().
+ */
+int drm_agp_enable(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_agp_mode_t mode;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+
+ if (copy_from_user(&mode, (drm_agp_mode_t __user *)arg, sizeof(mode)))
+ return -EFAULT;
+
+ dev->agp->mode = mode.mode;
+ agp_enable(mode.mode);
+ dev->agp->base = dev->agp->agp_info.aper_base;
+ dev->agp->enabled = 1;
+ return 0;
+}
+
+/**
+ * Allocate AGP memory.
+ *
+ * \param inode device inode.
+ * \param filp file 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 inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_agp_buffer_t request;
+ drm_agp_mem_t *entry;
+ DRM_AGP_MEM *memory;
+ unsigned long pages;
+ u32 type;
+ drm_agp_buffer_t __user *argp = (void __user *)arg;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (copy_from_user(&request, argp, sizeof(request)))
+ return -EFAULT;
+ 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(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;
+ entry->prev = NULL;
+ entry->next = dev->agp->memory;
+ if (dev->agp->memory)
+ dev->agp->memory->prev = entry;
+ dev->agp->memory = entry;
+
+ request.handle = entry->handle;
+ request.physical = memory->physical;
+
+ if (copy_to_user(argp, &request, sizeof(request))) {
+ dev->agp->memory = entry->next;
+ dev->agp->memory->prev = NULL;
+ drm_free_agp(memory, pages);
+ drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
+ return -EFAULT;
+ }
+ return 0;
+}
+
+/**
+ * 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 drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t *dev,
+ unsigned long handle)
+{
+ drm_agp_mem_t *entry;
+
+ for (entry = dev->agp->memory; entry; entry = entry->next) {
+ if (entry->handle == handle)
+ return entry;
+ }
+ return NULL;
+}
+
+/**
+ * Unbind AGP memory from the GATT (ioctl).
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \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 inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_agp_binding_t request;
+ drm_agp_mem_t *entry;
+ int ret;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
+ return -EFAULT;
+ 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;
+}
+
+/**
+ * Bind AGP memory into the GATT (ioctl)
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \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 inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_agp_binding_t request;
+ drm_agp_mem_t *entry;
+ int retcode;
+ int page;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
+ return -EFAULT;
+ 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;
+}
+
+/**
+ * Free AGP memory (ioctl).
+ *
+ * \param inode device inode.
+ * \param filp file 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 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 inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_agp_buffer_t request;
+ drm_agp_mem_t *entry;
+
+ if (!dev->agp || !dev->agp->acquired)
+ return -EINVAL;
+ if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request)))
+ return -EFAULT;
+ if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
+ return -EINVAL;
+ if (entry->bound)
+ drm_unbind_agp(entry->memory);
+
+ if (entry->prev)
+ entry->prev->next = entry->next;
+ else
+ dev->agp->memory = entry->next;
+
+ if (entry->next)
+ entry->next->prev = entry->prev;
+
+ drm_free_agp(entry->memory, entry->pages);
+ drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
+ return 0;
+}
+
+/**
+ * Initialize the AGP resources.
+ *
+ * \return pointer to a drm_agp_head structure.
+ *
+ */
+drm_agp_head_t *drm_agp_init(void)
+{
+ drm_agp_head_t *head = NULL;
+
+ if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
+ return NULL;
+ memset((void *)head, 0, sizeof(*head));
+ agp_copy_info(&head->agp_info);
+ if (head->agp_info.chipset == NOT_SUPPORTED) {
+ drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
+ return NULL;
+ }
+ head->memory = NULL;
+#if LINUX_VERSION_CODE <= 0x020408
+ head->cant_use_aperture = 0;
+ head->page_mask = ~(0xfff);
+#else
+ head->cant_use_aperture = head->agp_info.cant_use_aperture;
+ head->page_mask = head->agp_info.page_mask;
+#endif
+
+ return head;
+}
+
+/** Calls agp_allocate_memory() */
+DRM_AGP_MEM *drm_agp_allocate_memory(size_t pages, u32 type)
+{
+ return agp_allocate_memory(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 */
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