1 files changed, 451 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_agpsupport.c b/drivers/gpu/drm/drm_agpsupport.c
new file mode 100644
index 000000000..a4ad6fd13
--- /dev/null
+++ b/drivers/gpu/drm/drm_agpsupport.c
@@ -0,0 +1,451 @@
+/*
+ * \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 <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+#if IS_ENABLED(CONFIG_AGP)
+#include <asm/agp.h>
+#endif
+
+#include <drm/drm_device.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_file.h>
+#include <drm/drm_print.h>
+
+#include "drm_legacy.h"
+
+#if IS_ENABLED(CONFIG_AGP)
+
+/*
+ * Get AGP information.
+ *
+ * \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_legacy_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_legacy_agp_info);
+
+int drm_legacy_agp_info_ioctl(struct drm_device *dev, void *data,
+			      struct drm_file *file_priv)
+{
+	struct drm_agp_info *info = data;
+	int err;
+
+	err = drm_legacy_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_legacy_agp_acquire(struct drm_device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+	if (!dev->agp)
+		return -ENODEV;
+	if (dev->agp->acquired)
+		return -EBUSY;
+	dev->agp->bridge = agp_backend_acquire(pdev);
+	if (!dev->agp->bridge)
+		return -ENODEV;
+	dev->agp->acquired = 1;
+	return 0;
+}
+EXPORT_SYMBOL(drm_legacy_agp_acquire);
+
+/*
+ * Acquire the AGP device (ioctl).
+ *
+ * \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_legacy_agp_acquire_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file_priv)
+{
+	return drm_legacy_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_legacy_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_legacy_agp_release);
+
+int drm_legacy_agp_release_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file_priv)
+{
+	return drm_legacy_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_legacy_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_legacy_agp_enable);
+
+int drm_legacy_agp_enable_ioctl(struct drm_device *dev, void *data,
+				struct drm_file *file_priv)
+{
+	struct drm_agp_mode *mode = data;
+
+	return drm_legacy_agp_enable(dev, *mode);
+}
+
+/*
+ * Allocate AGP memory.
+ *
+ * \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_legacy_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;
+	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	pages = DIV_ROUND_UP(request->size, PAGE_SIZE);
+	type = (u32) request->type;
+	memory = agp_allocate_memory(dev->agp->bridge, pages, type);
+	if (!memory) {
+		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_legacy_agp_alloc);
+
+
+int drm_legacy_agp_alloc_ioctl(struct drm_device *dev, void *data,
+			struct drm_file *file_priv)
+{
+	struct drm_agp_buffer *request = data;
+
+	return drm_legacy_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_legacy_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).
+ *
+ * \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_legacy_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;
+	entry = drm_legacy_agp_lookup_entry(dev, request->handle);
+	if (!entry || !entry->bound)
+		return -EINVAL;
+	ret = agp_unbind_memory(entry->memory);
+	if (ret == 0)
+		entry->bound = 0;
+	return ret;
+}
+EXPORT_SYMBOL(drm_legacy_agp_unbind);
+
+
+int drm_legacy_agp_unbind_ioctl(struct drm_device *dev, void *data,
+				struct drm_file *file_priv)
+{
+	struct drm_agp_binding *request = data;
+
+	return drm_legacy_agp_unbind(dev, request);
+}
+
+/*
+ * Bind AGP memory into the GATT (ioctl)
+ *
+ * \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_legacy_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;
+	entry = drm_legacy_agp_lookup_entry(dev, request->handle);
+	if (!entry || entry->bound)
+		return -EINVAL;
+	page = DIV_ROUND_UP(request->offset, PAGE_SIZE);
+	retcode = agp_bind_memory(entry->memory, page);
+	if (retcode)
+		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_legacy_agp_bind);
+
+
+int drm_legacy_agp_bind_ioctl(struct drm_device *dev, void *data,
+			      struct drm_file *file_priv)
+{
+	struct drm_agp_binding *request = data;
+
+	return drm_legacy_agp_bind(dev, request);
+}
+
+/*
+ * Free AGP memory (ioctl).
+ *
+ * \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 is 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_legacy_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
+{
+	struct drm_agp_mem *entry;
+
+	if (!dev->agp || !dev->agp->acquired)
+		return -EINVAL;
+	entry = drm_legacy_agp_lookup_entry(dev, request->handle);
+	if (!entry)
+		return -EINVAL;
+	if (entry->bound)
+		agp_unbind_memory(entry->memory);
+
+	list_del(&entry->head);
+
+	agp_free_memory(entry->memory);
+	kfree(entry);
+	return 0;
+}
+EXPORT_SYMBOL(drm_legacy_agp_free);
+
+
+int drm_legacy_agp_free_ioctl(struct drm_device *dev, void *data,
+			      struct drm_file *file_priv)
+{
+	struct drm_agp_buffer *request = data;
+
+	return drm_legacy_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_legacy_agp_init(struct drm_device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	struct drm_agp_head *head = NULL;
+
+	head = kzalloc(sizeof(*head), GFP_KERNEL);
+	if (!head)
+		return NULL;
+	head->bridge = agp_find_bridge(pdev);
+	if (!head->bridge) {
+		head->bridge = agp_backend_acquire(pdev);
+		if (!head->bridge) {
+			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;
+}
+/* Only exported for i810.ko */
+EXPORT_SYMBOL(drm_legacy_agp_init);
+
+/**
+ * drm_legacy_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.
+ *
+ * Cleanup is only done for drivers who have DRIVER_LEGACY set.
+ */
+void drm_legacy_agp_clear(struct drm_device *dev)
+{
+	struct drm_agp_mem *entry, *tempe;
+
+	if (!dev->agp)
+		return;
+	if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+		return;
+
+	list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
+		if (entry->bound)
+			agp_unbind_memory(entry->memory);
+		agp_free_memory(entry->memory);
+		kfree(entry);
+	}
+	INIT_LIST_HEAD(&dev->agp->memory);
+
+	if (dev->agp->acquired)
+		drm_legacy_agp_release(dev);
+
+	dev->agp->acquired = 0;
+	dev->agp->enabled = 0;
+}
+
+#endif