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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /drivers/gpu/drm/drm_bufs.c
parentInitial commit. (diff)
downloadlinux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz
linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/drm_bufs.c')
-rw-r--r--drivers/gpu/drm/drm_bufs.c1574
1 files changed, 1574 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
new file mode 100644
index 000000000..21bec4548
--- /dev/null
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -0,0 +1,1574 @@
+/*
+ * Legacy: Generic DRM Buffer Management
+ *
+ * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * Author: Rickard E. (Rik) Faith <faith@valinux.com>
+ * Author: Gareth Hughes <gareth@valinux.com>
+ *
+ * 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/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/log2.h>
+#include <linux/export.h>
+#include <asm/shmparam.h>
+#include <drm/drmP.h>
+#include "drm_legacy.h"
+
+#include <linux/nospec.h>
+
+static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
+ struct drm_local_map *map)
+{
+ struct drm_map_list *entry;
+ list_for_each_entry(entry, &dev->maplist, head) {
+ /*
+ * Because the kernel-userspace ABI is fixed at a 32-bit offset
+ * while PCI resources may live above that, we only compare the
+ * lower 32 bits of the map offset for maps of type
+ * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
+ * It is assumed that if a driver have more than one resource
+ * of each type, the lower 32 bits are different.
+ */
+ if (!entry->map ||
+ map->type != entry->map->type ||
+ entry->master != dev->master)
+ continue;
+ switch (map->type) {
+ case _DRM_SHM:
+ if (map->flags != _DRM_CONTAINS_LOCK)
+ break;
+ return entry;
+ case _DRM_REGISTERS:
+ case _DRM_FRAME_BUFFER:
+ if ((entry->map->offset & 0xffffffff) ==
+ (map->offset & 0xffffffff))
+ return entry;
+ default: /* Make gcc happy */
+ ;
+ }
+ if (entry->map->offset == map->offset)
+ return entry;
+ }
+
+ return NULL;
+}
+
+static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
+ unsigned long user_token, int hashed_handle, int shm)
+{
+ int use_hashed_handle, shift;
+ unsigned long add;
+
+#if (BITS_PER_LONG == 64)
+ use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
+#elif (BITS_PER_LONG == 32)
+ use_hashed_handle = hashed_handle;
+#else
+#error Unsupported long size. Neither 64 nor 32 bits.
+#endif
+
+ if (!use_hashed_handle) {
+ int ret;
+ hash->key = user_token >> PAGE_SHIFT;
+ ret = drm_ht_insert_item(&dev->map_hash, hash);
+ if (ret != -EINVAL)
+ return ret;
+ }
+
+ shift = 0;
+ add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
+ if (shm && (SHMLBA > PAGE_SIZE)) {
+ int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
+
+ /* For shared memory, we have to preserve the SHMLBA
+ * bits of the eventual vma->vm_pgoff value during
+ * mmap(). Otherwise we run into cache aliasing problems
+ * on some platforms. On these platforms, the pgoff of
+ * a mmap() request is used to pick a suitable virtual
+ * address for the mmap() region such that it will not
+ * cause cache aliasing problems.
+ *
+ * Therefore, make sure the SHMLBA relevant bits of the
+ * hash value we use are equal to those in the original
+ * kernel virtual address.
+ */
+ shift = bits;
+ add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
+ }
+
+ return drm_ht_just_insert_please(&dev->map_hash, hash,
+ user_token, 32 - PAGE_SHIFT - 3,
+ shift, add);
+}
+
+/**
+ * Core function to create a range of memory available for mapping by a
+ * non-root process.
+ *
+ * Adjusts the memory offset to its absolute value according to the mapping
+ * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
+ * applicable and if supported by the kernel.
+ */
+static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
+ unsigned int size, enum drm_map_type type,
+ enum drm_map_flags flags,
+ struct drm_map_list **maplist)
+{
+ struct drm_local_map *map;
+ struct drm_map_list *list;
+ drm_dma_handle_t *dmah;
+ unsigned long user_token;
+ int ret;
+
+ map = kmalloc(sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;
+
+ map->offset = offset;
+ map->size = size;
+ map->flags = flags;
+ map->type = type;
+
+ /* Only allow shared memory to be removable since we only keep enough
+ * book keeping information about shared memory to allow for removal
+ * when processes fork.
+ */
+ if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
+ kfree(map);
+ return -EINVAL;
+ }
+ DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
+ (unsigned long long)map->offset, map->size, map->type);
+
+ /* page-align _DRM_SHM maps. They are allocated here so there is no security
+ * hole created by that and it works around various broken drivers that use
+ * a non-aligned quantity to map the SAREA. --BenH
+ */
+ if (map->type == _DRM_SHM)
+ map->size = PAGE_ALIGN(map->size);
+
+ if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
+ kfree(map);
+ return -EINVAL;
+ }
+ map->mtrr = -1;
+ map->handle = NULL;
+
+ switch (map->type) {
+ case _DRM_REGISTERS:
+ case _DRM_FRAME_BUFFER:
+#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
+ if (map->offset + (map->size-1) < map->offset ||
+ map->offset < virt_to_phys(high_memory)) {
+ kfree(map);
+ return -EINVAL;
+ }
+#endif
+ /* Some drivers preinitialize some maps, without the X Server
+ * needing to be aware of it. Therefore, we just return success
+ * when the server tries to create a duplicate map.
+ */
+ list = drm_find_matching_map(dev, map);
+ if (list != NULL) {
+ if (list->map->size != map->size) {
+ DRM_DEBUG("Matching maps of type %d with "
+ "mismatched sizes, (%ld vs %ld)\n",
+ map->type, map->size,
+ list->map->size);
+ list->map->size = map->size;
+ }
+
+ kfree(map);
+ *maplist = list;
+ return 0;
+ }
+
+ if (map->type == _DRM_FRAME_BUFFER ||
+ (map->flags & _DRM_WRITE_COMBINING)) {
+ map->mtrr =
+ arch_phys_wc_add(map->offset, map->size);
+ }
+ if (map->type == _DRM_REGISTERS) {
+ if (map->flags & _DRM_WRITE_COMBINING)
+ map->handle = ioremap_wc(map->offset,
+ map->size);
+ else
+ map->handle = ioremap(map->offset, map->size);
+ if (!map->handle) {
+ kfree(map);
+ return -ENOMEM;
+ }
+ }
+
+ break;
+ case _DRM_SHM:
+ list = drm_find_matching_map(dev, map);
+ if (list != NULL) {
+ if (list->map->size != map->size) {
+ DRM_DEBUG("Matching maps of type %d with "
+ "mismatched sizes, (%ld vs %ld)\n",
+ map->type, map->size, list->map->size);
+ list->map->size = map->size;
+ }
+
+ kfree(map);
+ *maplist = list;
+ return 0;
+ }
+ map->handle = vmalloc_user(map->size);
+ DRM_DEBUG("%lu %d %p\n",
+ map->size, order_base_2(map->size), map->handle);
+ if (!map->handle) {
+ kfree(map);
+ return -ENOMEM;
+ }
+ map->offset = (unsigned long)map->handle;
+ if (map->flags & _DRM_CONTAINS_LOCK) {
+ /* Prevent a 2nd X Server from creating a 2nd lock */
+ if (dev->master->lock.hw_lock != NULL) {
+ vfree(map->handle);
+ kfree(map);
+ return -EBUSY;
+ }
+ dev->sigdata.lock = dev->master->lock.hw_lock = map->handle; /* Pointer to lock */
+ }
+ break;
+ case _DRM_AGP: {
+ struct drm_agp_mem *entry;
+ int valid = 0;
+
+ if (!dev->agp) {
+ kfree(map);
+ return -EINVAL;
+ }
+#ifdef __alpha__
+ map->offset += dev->hose->mem_space->start;
+#endif
+ /* In some cases (i810 driver), user space may have already
+ * added the AGP base itself, because dev->agp->base previously
+ * only got set during AGP enable. So, only add the base
+ * address if the map's offset isn't already within the
+ * aperture.
+ */
+ if (map->offset < dev->agp->base ||
+ map->offset > dev->agp->base +
+ dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
+ map->offset += dev->agp->base;
+ }
+ map->mtrr = dev->agp->agp_mtrr; /* for getmap */
+
+ /* This assumes the DRM is in total control of AGP space.
+ * It's not always the case as AGP can be in the control
+ * of user space (i.e. i810 driver). So this loop will get
+ * skipped and we double check that dev->agp->memory is
+ * actually set as well as being invalid before EPERM'ing
+ */
+ list_for_each_entry(entry, &dev->agp->memory, head) {
+ if ((map->offset >= entry->bound) &&
+ (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
+ valid = 1;
+ break;
+ }
+ }
+ if (!list_empty(&dev->agp->memory) && !valid) {
+ kfree(map);
+ return -EPERM;
+ }
+ DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
+ (unsigned long long)map->offset, map->size);
+
+ break;
+ }
+ case _DRM_SCATTER_GATHER:
+ if (!dev->sg) {
+ kfree(map);
+ return -EINVAL;
+ }
+ map->offset += (unsigned long)dev->sg->virtual;
+ break;
+ case _DRM_CONSISTENT:
+ /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
+ * As we're limiting the address to 2^32-1 (or less),
+ * casting it down to 32 bits is no problem, but we
+ * need to point to a 64bit variable first. */
+ dmah = drm_pci_alloc(dev, map->size, map->size);
+ if (!dmah) {
+ kfree(map);
+ return -ENOMEM;
+ }
+ map->handle = dmah->vaddr;
+ map->offset = (unsigned long)dmah->busaddr;
+ kfree(dmah);
+ break;
+ default:
+ kfree(map);
+ return -EINVAL;
+ }
+
+ list = kzalloc(sizeof(*list), GFP_KERNEL);
+ if (!list) {
+ if (map->type == _DRM_REGISTERS)
+ iounmap(map->handle);
+ kfree(map);
+ return -EINVAL;
+ }
+ list->map = map;
+
+ mutex_lock(&dev->struct_mutex);
+ list_add(&list->head, &dev->maplist);
+
+ /* Assign a 32-bit handle */
+ /* We do it here so that dev->struct_mutex protects the increment */
+ user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
+ map->offset;
+ ret = drm_map_handle(dev, &list->hash, user_token, 0,
+ (map->type == _DRM_SHM));
+ if (ret) {
+ if (map->type == _DRM_REGISTERS)
+ iounmap(map->handle);
+ kfree(map);
+ kfree(list);
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+ }
+
+ list->user_token = list->hash.key << PAGE_SHIFT;
+ mutex_unlock(&dev->struct_mutex);
+
+ if (!(map->flags & _DRM_DRIVER))
+ list->master = dev->master;
+ *maplist = list;
+ return 0;
+}
+
+int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
+ unsigned int size, enum drm_map_type type,
+ enum drm_map_flags flags, struct drm_local_map **map_ptr)
+{
+ struct drm_map_list *list;
+ int rc;
+
+ rc = drm_addmap_core(dev, offset, size, type, flags, &list);
+ if (!rc)
+ *map_ptr = list->map;
+ return rc;
+}
+EXPORT_SYMBOL(drm_legacy_addmap);
+
+/**
+ * Ioctl to specify a range of memory that is available for mapping by a
+ * non-root process.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_map structure.
+ * \return zero on success or a negative value on error.
+ *
+ */
+int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_map *map = data;
+ struct drm_map_list *maplist;
+ int err;
+
+ if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
+ return -EPERM;
+
+ if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+ !drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ err = drm_addmap_core(dev, map->offset, map->size, map->type,
+ map->flags, &maplist);
+
+ if (err)
+ return err;
+
+ /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
+ map->handle = (void *)(unsigned long)maplist->user_token;
+
+ /*
+ * It appears that there are no users of this value whatsoever --
+ * drmAddMap just discards it. Let's not encourage its use.
+ * (Keeping drm_addmap_core's returned mtrr value would be wrong --
+ * it's not a real mtrr index anymore.)
+ */
+ map->mtrr = -1;
+
+ return 0;
+}
+
+/*
+ * Get a mapping information.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument, pointing to a drm_map structure.
+ *
+ * \return zero on success or a negative number on failure.
+ *
+ * Searches for the mapping with the specified offset and copies its information
+ * into userspace
+ */
+int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_map *map = data;
+ struct drm_map_list *r_list = NULL;
+ struct list_head *list;
+ int idx;
+ int i;
+
+ if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+ !drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ idx = map->offset;
+ if (idx < 0)
+ return -EINVAL;
+
+ i = 0;
+ mutex_lock(&dev->struct_mutex);
+ list_for_each(list, &dev->maplist) {
+ if (i == idx) {
+ r_list = list_entry(list, struct drm_map_list, head);
+ break;
+ }
+ i++;
+ }
+ if (!r_list || !r_list->map) {
+ mutex_unlock(&dev->struct_mutex);
+ return -EINVAL;
+ }
+
+ map->offset = r_list->map->offset;
+ map->size = r_list->map->size;
+ map->type = r_list->map->type;
+ map->flags = r_list->map->flags;
+ map->handle = (void *)(unsigned long) r_list->user_token;
+ map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return 0;
+}
+
+/**
+ * Remove a map private from list and deallocate resources if the mapping
+ * isn't in use.
+ *
+ * Searches the map on drm_device::maplist, removes it from the list, see if
+ * its being used, and free any associate resource (such as MTRR's) if it's not
+ * being on use.
+ *
+ * \sa drm_legacy_addmap
+ */
+int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
+{
+ struct drm_map_list *r_list = NULL, *list_t;
+ drm_dma_handle_t dmah;
+ int found = 0;
+ struct drm_master *master;
+
+ /* Find the list entry for the map and remove it */
+ list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
+ if (r_list->map == map) {
+ master = r_list->master;
+ list_del(&r_list->head);
+ drm_ht_remove_key(&dev->map_hash,
+ r_list->user_token >> PAGE_SHIFT);
+ kfree(r_list);
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found)
+ return -EINVAL;
+
+ switch (map->type) {
+ case _DRM_REGISTERS:
+ iounmap(map->handle);
+ /* FALLTHROUGH */
+ case _DRM_FRAME_BUFFER:
+ arch_phys_wc_del(map->mtrr);
+ break;
+ case _DRM_SHM:
+ vfree(map->handle);
+ if (master) {
+ if (dev->sigdata.lock == master->lock.hw_lock)
+ dev->sigdata.lock = NULL;
+ master->lock.hw_lock = NULL; /* SHM removed */
+ master->lock.file_priv = NULL;
+ wake_up_interruptible_all(&master->lock.lock_queue);
+ }
+ break;
+ case _DRM_AGP:
+ case _DRM_SCATTER_GATHER:
+ break;
+ case _DRM_CONSISTENT:
+ dmah.vaddr = map->handle;
+ dmah.busaddr = map->offset;
+ dmah.size = map->size;
+ __drm_legacy_pci_free(dev, &dmah);
+ break;
+ }
+ kfree(map);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_legacy_rmmap_locked);
+
+void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
+{
+ if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+ !drm_core_check_feature(dev, DRIVER_LEGACY))
+ return;
+
+ mutex_lock(&dev->struct_mutex);
+ drm_legacy_rmmap_locked(dev, map);
+ mutex_unlock(&dev->struct_mutex);
+}
+EXPORT_SYMBOL(drm_legacy_rmmap);
+
+void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
+{
+ struct drm_map_list *r_list, *list_temp;
+
+ if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+ return;
+
+ mutex_lock(&dev->struct_mutex);
+ list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
+ if (r_list->master == master) {
+ drm_legacy_rmmap_locked(dev, r_list->map);
+ r_list = NULL;
+ }
+ }
+ mutex_unlock(&dev->struct_mutex);
+}
+
+/* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
+ * the last close of the device, and this is necessary for cleanup when things
+ * exit uncleanly. Therefore, having userland manually remove mappings seems
+ * like a pointless exercise since they're going away anyway.
+ *
+ * One use case might be after addmap is allowed for normal users for SHM and
+ * gets used by drivers that the server doesn't need to care about. This seems
+ * unlikely.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a struct drm_map structure.
+ * \return zero on success or a negative value on error.
+ */
+int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_map *request = data;
+ struct drm_local_map *map = NULL;
+ struct drm_map_list *r_list;
+ int ret;
+
+ if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+ !drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ mutex_lock(&dev->struct_mutex);
+ list_for_each_entry(r_list, &dev->maplist, head) {
+ if (r_list->map &&
+ r_list->user_token == (unsigned long)request->handle &&
+ r_list->map->flags & _DRM_REMOVABLE) {
+ map = r_list->map;
+ break;
+ }
+ }
+
+ /* List has wrapped around to the head pointer, or its empty we didn't
+ * find anything.
+ */
+ if (list_empty(&dev->maplist) || !map) {
+ mutex_unlock(&dev->struct_mutex);
+ return -EINVAL;
+ }
+
+ /* Register and framebuffer maps are permanent */
+ if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
+ mutex_unlock(&dev->struct_mutex);
+ return 0;
+ }
+
+ ret = drm_legacy_rmmap_locked(dev, map);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return ret;
+}
+
+/**
+ * Cleanup after an error on one of the addbufs() functions.
+ *
+ * \param dev DRM device.
+ * \param entry buffer entry where the error occurred.
+ *
+ * Frees any pages and buffers associated with the given entry.
+ */
+static void drm_cleanup_buf_error(struct drm_device *dev,
+ struct drm_buf_entry *entry)
+{
+ int i;
+
+ if (entry->seg_count) {
+ for (i = 0; i < entry->seg_count; i++) {
+ if (entry->seglist[i]) {
+ drm_pci_free(dev, entry->seglist[i]);
+ }
+ }
+ kfree(entry->seglist);
+
+ entry->seg_count = 0;
+ }
+
+ if (entry->buf_count) {
+ for (i = 0; i < entry->buf_count; i++) {
+ kfree(entry->buflist[i].dev_private);
+ }
+ kfree(entry->buflist);
+
+ entry->buf_count = 0;
+ }
+}
+
+#if IS_ENABLED(CONFIG_AGP)
+/**
+ * Add AGP buffers for DMA transfers.
+ *
+ * \param dev struct drm_device to which the buffers are to be added.
+ * \param request pointer to a struct drm_buf_desc describing the request.
+ * \return zero on success or a negative number on failure.
+ *
+ * After some sanity checks creates a drm_buf structure for each buffer and
+ * reallocates the buffer list of the same size order to accommodate the new
+ * buffers.
+ */
+int drm_legacy_addbufs_agp(struct drm_device *dev,
+ struct drm_buf_desc *request)
+{
+ struct drm_device_dma *dma = dev->dma;
+ struct drm_buf_entry *entry;
+ struct drm_agp_mem *agp_entry;
+ struct drm_buf *buf;
+ unsigned long offset;
+ unsigned long agp_offset;
+ int count;
+ int order;
+ int size;
+ int alignment;
+ int page_order;
+ int total;
+ int byte_count;
+ int i, valid;
+ struct drm_buf **temp_buflist;
+
+ if (!dma)
+ return -EINVAL;
+
+ count = request->count;
+ order = order_base_2(request->size);
+ size = 1 << order;
+
+ alignment = (request->flags & _DRM_PAGE_ALIGN)
+ ? PAGE_ALIGN(size) : size;
+ page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
+ total = PAGE_SIZE << page_order;
+
+ byte_count = 0;
+ agp_offset = dev->agp->base + request->agp_start;
+
+ DRM_DEBUG("count: %d\n", count);
+ DRM_DEBUG("order: %d\n", order);
+ DRM_DEBUG("size: %d\n", size);
+ DRM_DEBUG("agp_offset: %lx\n", agp_offset);
+ DRM_DEBUG("alignment: %d\n", alignment);
+ DRM_DEBUG("page_order: %d\n", page_order);
+ DRM_DEBUG("total: %d\n", total);
+
+ if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
+ return -EINVAL;
+
+ /* Make sure buffers are located in AGP memory that we own */
+ valid = 0;
+ list_for_each_entry(agp_entry, &dev->agp->memory, head) {
+ if ((agp_offset >= agp_entry->bound) &&
+ (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
+ valid = 1;
+ break;
+ }
+ }
+ if (!list_empty(&dev->agp->memory) && !valid) {
+ DRM_DEBUG("zone invalid\n");
+ return -EINVAL;
+ }
+ spin_lock(&dev->buf_lock);
+ if (dev->buf_use) {
+ spin_unlock(&dev->buf_lock);
+ return -EBUSY;
+ }
+ atomic_inc(&dev->buf_alloc);
+ spin_unlock(&dev->buf_lock);
+
+ mutex_lock(&dev->struct_mutex);
+ entry = &dma->bufs[order];
+ if (entry->buf_count) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM; /* May only call once for each order */
+ }
+
+ if (count < 0 || count > 4096) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -EINVAL;
+ }
+
+ entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
+ if (!entry->buflist) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+
+ entry->buf_size = size;
+ entry->page_order = page_order;
+
+ offset = 0;
+
+ while (entry->buf_count < count) {
+ buf = &entry->buflist[entry->buf_count];
+ buf->idx = dma->buf_count + entry->buf_count;
+ buf->total = alignment;
+ buf->order = order;
+ buf->used = 0;
+
+ buf->offset = (dma->byte_count + offset);
+ buf->bus_address = agp_offset + offset;
+ buf->address = (void *)(agp_offset + offset);
+ buf->next = NULL;
+ buf->waiting = 0;
+ buf->pending = 0;
+ buf->file_priv = NULL;
+
+ buf->dev_priv_size = dev->driver->dev_priv_size;
+ buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
+ if (!buf->dev_private) {
+ /* Set count correctly so we free the proper amount. */
+ entry->buf_count = count;
+ drm_cleanup_buf_error(dev, entry);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+
+ DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
+
+ offset += alignment;
+ entry->buf_count++;
+ byte_count += PAGE_SIZE << page_order;
+ }
+
+ DRM_DEBUG("byte_count: %d\n", byte_count);
+
+ temp_buflist = krealloc(dma->buflist,
+ (dma->buf_count + entry->buf_count) *
+ sizeof(*dma->buflist), GFP_KERNEL);
+ if (!temp_buflist) {
+ /* Free the entry because it isn't valid */
+ drm_cleanup_buf_error(dev, entry);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+ dma->buflist = temp_buflist;
+
+ for (i = 0; i < entry->buf_count; i++) {
+ dma->buflist[i + dma->buf_count] = &entry->buflist[i];
+ }
+
+ dma->buf_count += entry->buf_count;
+ dma->seg_count += entry->seg_count;
+ dma->page_count += byte_count >> PAGE_SHIFT;
+ dma->byte_count += byte_count;
+
+ DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
+ DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ request->count = entry->buf_count;
+ request->size = size;
+
+ dma->flags = _DRM_DMA_USE_AGP;
+
+ atomic_dec(&dev->buf_alloc);
+ return 0;
+}
+EXPORT_SYMBOL(drm_legacy_addbufs_agp);
+#endif /* CONFIG_AGP */
+
+int drm_legacy_addbufs_pci(struct drm_device *dev,
+ struct drm_buf_desc *request)
+{
+ struct drm_device_dma *dma = dev->dma;
+ int count;
+ int order;
+ int size;
+ int total;
+ int page_order;
+ struct drm_buf_entry *entry;
+ drm_dma_handle_t *dmah;
+ struct drm_buf *buf;
+ int alignment;
+ unsigned long offset;
+ int i;
+ int byte_count;
+ int page_count;
+ unsigned long *temp_pagelist;
+ struct drm_buf **temp_buflist;
+
+ if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
+ return -EINVAL;
+
+ if (!dma)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ count = request->count;
+ order = order_base_2(request->size);
+ size = 1 << order;
+
+ DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
+ request->count, request->size, size, order);
+
+ if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
+ return -EINVAL;
+
+ alignment = (request->flags & _DRM_PAGE_ALIGN)
+ ? PAGE_ALIGN(size) : size;
+ page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
+ total = PAGE_SIZE << page_order;
+
+ spin_lock(&dev->buf_lock);
+ if (dev->buf_use) {
+ spin_unlock(&dev->buf_lock);
+ return -EBUSY;
+ }
+ atomic_inc(&dev->buf_alloc);
+ spin_unlock(&dev->buf_lock);
+
+ mutex_lock(&dev->struct_mutex);
+ entry = &dma->bufs[order];
+ if (entry->buf_count) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM; /* May only call once for each order */
+ }
+
+ if (count < 0 || count > 4096) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -EINVAL;
+ }
+
+ entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
+ if (!entry->buflist) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+
+ entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
+ if (!entry->seglist) {
+ kfree(entry->buflist);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+
+ /* Keep the original pagelist until we know all the allocations
+ * have succeeded
+ */
+ temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
+ sizeof(*dma->pagelist),
+ GFP_KERNEL);
+ if (!temp_pagelist) {
+ kfree(entry->buflist);
+ kfree(entry->seglist);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+ memcpy(temp_pagelist,
+ dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
+ DRM_DEBUG("pagelist: %d entries\n",
+ dma->page_count + (count << page_order));
+
+ entry->buf_size = size;
+ entry->page_order = page_order;
+ byte_count = 0;
+ page_count = 0;
+
+ while (entry->buf_count < count) {
+
+ dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
+
+ if (!dmah) {
+ /* Set count correctly so we free the proper amount. */
+ entry->buf_count = count;
+ entry->seg_count = count;
+ drm_cleanup_buf_error(dev, entry);
+ kfree(temp_pagelist);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+ entry->seglist[entry->seg_count++] = dmah;
+ for (i = 0; i < (1 << page_order); i++) {
+ DRM_DEBUG("page %d @ 0x%08lx\n",
+ dma->page_count + page_count,
+ (unsigned long)dmah->vaddr + PAGE_SIZE * i);
+ temp_pagelist[dma->page_count + page_count++]
+ = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
+ }
+ for (offset = 0;
+ offset + size <= total && entry->buf_count < count;
+ offset += alignment, ++entry->buf_count) {
+ buf = &entry->buflist[entry->buf_count];
+ buf->idx = dma->buf_count + entry->buf_count;
+ buf->total = alignment;
+ buf->order = order;
+ buf->used = 0;
+ buf->offset = (dma->byte_count + byte_count + offset);
+ buf->address = (void *)(dmah->vaddr + offset);
+ buf->bus_address = dmah->busaddr + offset;
+ buf->next = NULL;
+ buf->waiting = 0;
+ buf->pending = 0;
+ buf->file_priv = NULL;
+
+ buf->dev_priv_size = dev->driver->dev_priv_size;
+ buf->dev_private = kzalloc(buf->dev_priv_size,
+ GFP_KERNEL);
+ if (!buf->dev_private) {
+ /* Set count correctly so we free the proper amount. */
+ entry->buf_count = count;
+ entry->seg_count = count;
+ drm_cleanup_buf_error(dev, entry);
+ kfree(temp_pagelist);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+
+ DRM_DEBUG("buffer %d @ %p\n",
+ entry->buf_count, buf->address);
+ }
+ byte_count += PAGE_SIZE << page_order;
+ }
+
+ temp_buflist = krealloc(dma->buflist,
+ (dma->buf_count + entry->buf_count) *
+ sizeof(*dma->buflist), GFP_KERNEL);
+ if (!temp_buflist) {
+ /* Free the entry because it isn't valid */
+ drm_cleanup_buf_error(dev, entry);
+ kfree(temp_pagelist);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+ dma->buflist = temp_buflist;
+
+ for (i = 0; i < entry->buf_count; i++) {
+ dma->buflist[i + dma->buf_count] = &entry->buflist[i];
+ }
+
+ /* No allocations failed, so now we can replace the original pagelist
+ * with the new one.
+ */
+ if (dma->page_count) {
+ kfree(dma->pagelist);
+ }
+ dma->pagelist = temp_pagelist;
+
+ dma->buf_count += entry->buf_count;
+ dma->seg_count += entry->seg_count;
+ dma->page_count += entry->seg_count << page_order;
+ dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ request->count = entry->buf_count;
+ request->size = size;
+
+ if (request->flags & _DRM_PCI_BUFFER_RO)
+ dma->flags = _DRM_DMA_USE_PCI_RO;
+
+ atomic_dec(&dev->buf_alloc);
+ return 0;
+
+}
+EXPORT_SYMBOL(drm_legacy_addbufs_pci);
+
+static int drm_legacy_addbufs_sg(struct drm_device *dev,
+ struct drm_buf_desc *request)
+{
+ struct drm_device_dma *dma = dev->dma;
+ struct drm_buf_entry *entry;
+ struct drm_buf *buf;
+ unsigned long offset;
+ unsigned long agp_offset;
+ int count;
+ int order;
+ int size;
+ int alignment;
+ int page_order;
+ int total;
+ int byte_count;
+ int i;
+ struct drm_buf **temp_buflist;
+
+ if (!drm_core_check_feature(dev, DRIVER_SG))
+ return -EINVAL;
+
+ if (!dma)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ count = request->count;
+ order = order_base_2(request->size);
+ size = 1 << order;
+
+ alignment = (request->flags & _DRM_PAGE_ALIGN)
+ ? PAGE_ALIGN(size) : size;
+ page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
+ total = PAGE_SIZE << page_order;
+
+ byte_count = 0;
+ agp_offset = request->agp_start;
+
+ DRM_DEBUG("count: %d\n", count);
+ DRM_DEBUG("order: %d\n", order);
+ DRM_DEBUG("size: %d\n", size);
+ DRM_DEBUG("agp_offset: %lu\n", agp_offset);
+ DRM_DEBUG("alignment: %d\n", alignment);
+ DRM_DEBUG("page_order: %d\n", page_order);
+ DRM_DEBUG("total: %d\n", total);
+
+ if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
+ return -EINVAL;
+
+ spin_lock(&dev->buf_lock);
+ if (dev->buf_use) {
+ spin_unlock(&dev->buf_lock);
+ return -EBUSY;
+ }
+ atomic_inc(&dev->buf_alloc);
+ spin_unlock(&dev->buf_lock);
+
+ mutex_lock(&dev->struct_mutex);
+ entry = &dma->bufs[order];
+ if (entry->buf_count) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM; /* May only call once for each order */
+ }
+
+ if (count < 0 || count > 4096) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -EINVAL;
+ }
+
+ entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
+ if (!entry->buflist) {
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+
+ entry->buf_size = size;
+ entry->page_order = page_order;
+
+ offset = 0;
+
+ while (entry->buf_count < count) {
+ buf = &entry->buflist[entry->buf_count];
+ buf->idx = dma->buf_count + entry->buf_count;
+ buf->total = alignment;
+ buf->order = order;
+ buf->used = 0;
+
+ buf->offset = (dma->byte_count + offset);
+ buf->bus_address = agp_offset + offset;
+ buf->address = (void *)(agp_offset + offset
+ + (unsigned long)dev->sg->virtual);
+ buf->next = NULL;
+ buf->waiting = 0;
+ buf->pending = 0;
+ buf->file_priv = NULL;
+
+ buf->dev_priv_size = dev->driver->dev_priv_size;
+ buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
+ if (!buf->dev_private) {
+ /* Set count correctly so we free the proper amount. */
+ entry->buf_count = count;
+ drm_cleanup_buf_error(dev, entry);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+
+ DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
+
+ offset += alignment;
+ entry->buf_count++;
+ byte_count += PAGE_SIZE << page_order;
+ }
+
+ DRM_DEBUG("byte_count: %d\n", byte_count);
+
+ temp_buflist = krealloc(dma->buflist,
+ (dma->buf_count + entry->buf_count) *
+ sizeof(*dma->buflist), GFP_KERNEL);
+ if (!temp_buflist) {
+ /* Free the entry because it isn't valid */
+ drm_cleanup_buf_error(dev, entry);
+ mutex_unlock(&dev->struct_mutex);
+ atomic_dec(&dev->buf_alloc);
+ return -ENOMEM;
+ }
+ dma->buflist = temp_buflist;
+
+ for (i = 0; i < entry->buf_count; i++) {
+ dma->buflist[i + dma->buf_count] = &entry->buflist[i];
+ }
+
+ dma->buf_count += entry->buf_count;
+ dma->seg_count += entry->seg_count;
+ dma->page_count += byte_count >> PAGE_SHIFT;
+ dma->byte_count += byte_count;
+
+ DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
+ DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ request->count = entry->buf_count;
+ request->size = size;
+
+ dma->flags = _DRM_DMA_USE_SG;
+
+ atomic_dec(&dev->buf_alloc);
+ return 0;
+}
+
+/**
+ * Add buffers for DMA transfers (ioctl).
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a struct drm_buf_desc request.
+ * \return zero on success or a negative number on failure.
+ *
+ * According with the memory type specified in drm_buf_desc::flags and the
+ * build options, it dispatches the call either to addbufs_agp(),
+ * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
+ * PCI memory respectively.
+ */
+int drm_legacy_addbufs(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_buf_desc *request = data;
+ int ret;
+
+ if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+ return -EINVAL;
+
+#if IS_ENABLED(CONFIG_AGP)
+ if (request->flags & _DRM_AGP_BUFFER)
+ ret = drm_legacy_addbufs_agp(dev, request);
+ else
+#endif
+ if (request->flags & _DRM_SG_BUFFER)
+ ret = drm_legacy_addbufs_sg(dev, request);
+ else if (request->flags & _DRM_FB_BUFFER)
+ ret = -EINVAL;
+ else
+ ret = drm_legacy_addbufs_pci(dev, request);
+
+ return ret;
+}
+
+/**
+ * Get information about the buffer mappings.
+ *
+ * This was originally mean for debugging purposes, or by a sophisticated
+ * client library to determine how best to use the available buffers (e.g.,
+ * large buffers can be used for image transfer).
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_buf_info structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Increments drm_device::buf_use while holding the drm_device::buf_lock
+ * lock, preventing of allocating more buffers after this call. Information
+ * about each requested buffer is then copied into user space.
+ */
+int __drm_legacy_infobufs(struct drm_device *dev,
+ void *data, int *p,
+ int (*f)(void *, int, struct drm_buf_entry *))
+{
+ struct drm_device_dma *dma = dev->dma;
+ int i;
+ int count;
+
+ if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+ return -EINVAL;
+
+ if (!dma)
+ return -EINVAL;
+
+ spin_lock(&dev->buf_lock);
+ if (atomic_read(&dev->buf_alloc)) {
+ spin_unlock(&dev->buf_lock);
+ return -EBUSY;
+ }
+ ++dev->buf_use; /* Can't allocate more after this call */
+ spin_unlock(&dev->buf_lock);
+
+ for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
+ if (dma->bufs[i].buf_count)
+ ++count;
+ }
+
+ DRM_DEBUG("count = %d\n", count);
+
+ if (*p >= count) {
+ for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
+ struct drm_buf_entry *from = &dma->bufs[i];
+ if (from->buf_count) {
+ if (f(data, count, from) < 0)
+ return -EFAULT;
+ DRM_DEBUG("%d %d %d %d %d\n",
+ i,
+ dma->bufs[i].buf_count,
+ dma->bufs[i].buf_size,
+ dma->bufs[i].low_mark,
+ dma->bufs[i].high_mark);
+ ++count;
+ }
+ }
+ }
+ *p = count;
+
+ return 0;
+}
+
+static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
+{
+ struct drm_buf_info *request = data;
+ struct drm_buf_desc __user *to = &request->list[count];
+ struct drm_buf_desc v = {.count = from->buf_count,
+ .size = from->buf_size,
+ .low_mark = from->low_mark,
+ .high_mark = from->high_mark};
+
+ if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
+ return -EFAULT;
+ return 0;
+}
+
+int drm_legacy_infobufs(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_buf_info *request = data;
+ return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
+}
+
+/**
+ * Specifies a low and high water mark for buffer allocation
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg a pointer to a drm_buf_desc structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies that the size order is bounded between the admissible orders and
+ * updates the respective drm_device_dma::bufs entry low and high water mark.
+ *
+ * \note This ioctl is deprecated and mostly never used.
+ */
+int drm_legacy_markbufs(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_device_dma *dma = dev->dma;
+ struct drm_buf_desc *request = data;
+ int order;
+ struct drm_buf_entry *entry;
+
+ if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+ return -EINVAL;
+
+ if (!dma)
+ return -EINVAL;
+
+ DRM_DEBUG("%d, %d, %d\n",
+ request->size, request->low_mark, request->high_mark);
+ order = order_base_2(request->size);
+ if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
+ return -EINVAL;
+ entry = &dma->bufs[order];
+
+ if (request->low_mark < 0 || request->low_mark > entry->buf_count)
+ return -EINVAL;
+ if (request->high_mark < 0 || request->high_mark > entry->buf_count)
+ return -EINVAL;
+
+ entry->low_mark = request->low_mark;
+ entry->high_mark = request->high_mark;
+
+ return 0;
+}
+
+/**
+ * Unreserve the buffers in list, previously reserved using drmDMA.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_buf_free structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Calls free_buffer() for each used buffer.
+ * This function is primarily used for debugging.
+ */
+int drm_legacy_freebufs(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_device_dma *dma = dev->dma;
+ struct drm_buf_free *request = data;
+ int i;
+ int idx;
+ struct drm_buf *buf;
+
+ if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+ return -EINVAL;
+
+ if (!dma)
+ return -EINVAL;
+
+ DRM_DEBUG("%d\n", request->count);
+ for (i = 0; i < request->count; i++) {
+ if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
+ return -EFAULT;
+ if (idx < 0 || idx >= dma->buf_count) {
+ DRM_ERROR("Index %d (of %d max)\n",
+ idx, dma->buf_count - 1);
+ return -EINVAL;
+ }
+ idx = array_index_nospec(idx, dma->buf_count);
+ buf = dma->buflist[idx];
+ if (buf->file_priv != file_priv) {
+ DRM_ERROR("Process %d freeing buffer not owned\n",
+ task_pid_nr(current));
+ return -EINVAL;
+ }
+ drm_legacy_free_buffer(dev, buf);
+ }
+
+ return 0;
+}
+
+/**
+ * Maps all of the DMA buffers into client-virtual space (ioctl).
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_buf_map structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
+ * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
+ * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
+ * drm_mmap_dma().
+ */
+int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
+ void __user **v,
+ int (*f)(void *, int, unsigned long,
+ struct drm_buf *),
+ struct drm_file *file_priv)
+{
+ struct drm_device_dma *dma = dev->dma;
+ int retcode = 0;
+ unsigned long virtual;
+ int i;
+
+ if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+ return -EINVAL;
+
+ if (!dma)
+ return -EINVAL;
+
+ spin_lock(&dev->buf_lock);
+ if (atomic_read(&dev->buf_alloc)) {
+ spin_unlock(&dev->buf_lock);
+ return -EBUSY;
+ }
+ dev->buf_use++; /* Can't allocate more after this call */
+ spin_unlock(&dev->buf_lock);
+
+ if (*p >= dma->buf_count) {
+ if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
+ || (drm_core_check_feature(dev, DRIVER_SG)
+ && (dma->flags & _DRM_DMA_USE_SG))) {
+ struct drm_local_map *map = dev->agp_buffer_map;
+ unsigned long token = dev->agp_buffer_token;
+
+ if (!map) {
+ retcode = -EINVAL;
+ goto done;
+ }
+ virtual = vm_mmap(file_priv->filp, 0, map->size,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED,
+ token);
+ } else {
+ virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED, 0);
+ }
+ if (virtual > -1024UL) {
+ /* Real error */
+ retcode = (signed long)virtual;
+ goto done;
+ }
+ *v = (void __user *)virtual;
+
+ for (i = 0; i < dma->buf_count; i++) {
+ if (f(data, i, virtual, dma->buflist[i]) < 0) {
+ retcode = -EFAULT;
+ goto done;
+ }
+ }
+ }
+ done:
+ *p = dma->buf_count;
+ DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
+
+ return retcode;
+}
+
+static int map_one_buf(void *data, int idx, unsigned long virtual,
+ struct drm_buf *buf)
+{
+ struct drm_buf_map *request = data;
+ unsigned long address = virtual + buf->offset; /* *** */
+
+ if (copy_to_user(&request->list[idx].idx, &buf->idx,
+ sizeof(request->list[0].idx)))
+ return -EFAULT;
+ if (copy_to_user(&request->list[idx].total, &buf->total,
+ sizeof(request->list[0].total)))
+ return -EFAULT;
+ if (clear_user(&request->list[idx].used, sizeof(int)))
+ return -EFAULT;
+ if (copy_to_user(&request->list[idx].address, &address,
+ sizeof(address)))
+ return -EFAULT;
+ return 0;
+}
+
+int drm_legacy_mapbufs(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_buf_map *request = data;
+ return __drm_legacy_mapbufs(dev, data, &request->count,
+ &request->virtual, map_one_buf,
+ file_priv);
+}
+
+int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+ return -EINVAL;
+
+ if (dev->driver->dma_ioctl)
+ return dev->driver->dma_ioctl(dev, data, file_priv);
+ else
+ return -EINVAL;
+}
+
+struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
+{
+ struct drm_map_list *entry;
+
+ list_for_each_entry(entry, &dev->maplist, head) {
+ if (entry->map && entry->map->type == _DRM_SHM &&
+ (entry->map->flags & _DRM_CONTAINS_LOCK)) {
+ return entry->map;
+ }
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(drm_legacy_getsarea);