+ *
+ * Drivers can call drm_gpuva_sm_map_ops_create() to obtain a
list of map, unmap
+ * and remap operations for a given newly requested mapping. This list
+ * represents the set of operations to execute in order to
integrate the new
+ * mapping cleanly into the current state of the GPU VA space.
+ *
+ * Depending on how the new GPU VA mapping intersects with the
existent mappings
+ * of the GPU VA space the &drm_gpuva_ops contain an arbitrary
amount of unmap
+ * operations, a maximum of two remap operations and a single map
operation.
+ * The set of operations can also be empty if no operation is
required, e.g. if
+ * the requested mapping already exists in the exact same way.
+ *
+ * The single map operation, if existent, represents the original
map operation
+ * requested by the caller. Please note that this operation might
be altered
+ * comparing it with the original map operation, e.g. because it
was merged with
+ * an already existent mapping. Hence, drivers must execute this
map operation
+ * instead of the original one they passed to
drm_gpuva_sm_map_ops_create().
+ *
+ * &drm_gpuva_op_unmap contains a 'keep' field, which indicates
whether the
+ * &drm_gpuva to unmap is physically contiguous with the original
mapping
+ * request. Optionally, if 'keep' is set, drivers may keep the
actual page table
+ * entries for this &drm_gpuva, adding the missing page table
entries only and
+ * update the &drm_gpuva_manager's view of things accordingly.
+ *
+ * Drivers may do the same optimization, namely delta page table
updates, also
+ * for remap operations. This is possible since
&drm_gpuva_op_remap consists of
+ * one unmap operation and one or two map operations, such that
drivers can
+ * derive the page table update delta accordingly.
+ *
+ * Note that there can't be more than two existent mappings to
split up, one at
+ * the beginning and one at the end of the new mapping, hence there is a
+ * maximum of two remap operations.
+ *
+ * Generally, the DRM GPU VA manager never merges mappings across the
+ * boundaries of &drm_gpuva_regions. This is the case since
merging between
+ * GPU VA regions would result into unmap and map operations to
be issued for
+ * both regions involved although the original mapping request
was referred to
+ * one specific GPU VA region only. Since the other GPU VA
region, the one not
+ * explicitly requested to be altered, might be in use by the
GPU, we are not
+ * allowed to issue any map/unmap operations for this region.
+ *
+ * Note that before calling drm_gpuva_sm_map_ops_create() again
with another
+ * mapping request it is necessary to update the
&drm_gpuva_manager's view of
+ * the GPU VA space. The previously obtained operations must be
either fully
+ * processed or completely abandoned.
+ *
+ * To update the &drm_gpuva_manager's view of the GPU VA space
+ * drm_gpuva_insert(), drm_gpuva_destroy_locked() and/or
+ * drm_gpuva_destroy_unlocked() should be used.
+ *
+ * Analogue to drm_gpuva_sm_map_ops_create()
drm_gpuva_sm_unmap_ops_create()
+ * provides drivers a the list of operations to be executed in
order to unmap
+ * a range of GPU VA space. The logic behind this functions is
way simpler
+ * though: For all existent mappings enclosed by the given range unmap
+ * operations are created. For mappings which are only partically
located within
+ * the given range, remap operations are created such that those
mappings are
+ * split up and re-mapped partically.
+ *
+ * The following paragraph depicts the basic constellations of
existent GPU VA
+ * mappings, a newly requested mapping and the resulting mappings
as implemented
+ * by drm_gpuva_sm_map_ops_create() - it doesn't cover arbitrary
combinations
+ * of those constellations.
+ *
+ * ::
+ *
+ * 1) Existent mapping is kept.
+ * ----------------------------
+ *
+ * 0 a 1
+ * old: |-----------| (bo_offset=n)
+ *
+ * 0 a 1
+ * req: |-----------| (bo_offset=n)
+ *
+ * 0 a 1
+ * new: |-----------| (bo_offset=n)
+ *
+ *
+ * 2) Existent mapping is replaced.
+ * --------------------------------
+ *
+ * 0 a 1
+ * old: |-----------| (bo_offset=n)
+ *
+ * 0 a 1
+ * req: |-----------| (bo_offset=m)
+ *
+ * 0 a 1
+ * new: |-----------| (bo_offset=m)
+ *
+ *
+ * 3) Existent mapping is replaced.
+ * --------------------------------
+ *
+ * 0 a 1
+ * old: |-----------| (bo_offset=n)
+ *
+ * 0 b 1
+ * req: |-----------| (bo_offset=n)
+ *
+ * 0 b 1
+ * new: |-----------| (bo_offset=n)
+ *
+ *
+ * 4) Existent mapping is replaced.
+ * --------------------------------
+ *
+ * 0 a 1
+ * old: |-----| (bo_offset=n)
+ *
+ * 0 a 2
+ * req: |-----------| (bo_offset=n)
+ *
+ * 0 a 2
+ * new: |-----------| (bo_offset=n)
+ *
+ * Note: We expect to see the same result for a request with a
different bo
+ * and/or bo_offset.
+ *
+ *
+ * 5) Existent mapping is split.
+ * -----------------------------
+ *
+ * 0 a 2
+ * old: |-----------| (bo_offset=n)
+ *
+ * 0 b 1
+ * req: |-----| (bo_offset=n)
+ *
+ * 0 b 1 a' 2
+ * new: |-----|-----| (b.bo_offset=n, a.bo_offset=n+1)
+ *
+ * Note: We expect to see the same result for a request with a
different bo
+ * and/or non-contiguous bo_offset.
+ *
+ *
+ * 6) Existent mapping is kept.
+ * ----------------------------
+ *
+ * 0 a 2
+ * old: |-----------| (bo_offset=n)
+ *
+ * 0 a 1
+ * req: |-----| (bo_offset=n)
+ *
+ * 0 a 2
+ * new: |-----------| (bo_offset=n)
+ *
+ *
+ * 7) Existent mapping is split.
+ * -----------------------------
+ *
+ * 0 a 2
+ * old: |-----------| (bo_offset=n)
+ *
+ * 1 b 2
+ * req: |-----| (bo_offset=m)
+ *
+ * 0 a 1 b 2
+ * new: |-----|-----| (a.bo_offset=n,b.bo_offset=m)
+ *
+ *
+ * 8) Existent mapping is kept.
+ * ----------------------------
+ *
+ * 0 a 2
+ * old: |-----------| (bo_offset=n)
+ *
+ * 1 a 2
+ * req: |-----| (bo_offset=n+1)
+ *
+ * 0 a 2
+ * new: |-----------| (bo_offset=n)
+ *
+ *
+ * 9) Existent mapping is split.
+ * -----------------------------
+ *
+ * 0 a 2
+ * old: |-----------| (bo_offset=n)
+ *
+ * 1 b 3
+ * req: |-----------| (bo_offset=m)
+ *
+ * 0 a 1 b 3
+ * new: |-----|-----------| (a.bo_offset=n,b.bo_offset=m)
+ *
+ *
+ * 10) Existent mapping is merged.
+ * -------------------------------
+ *
+ * 0 a 2
+ * old: |-----------| (bo_offset=n)
+ *
+ * 1 a 3
+ * req: |-----------| (bo_offset=n+1)
+ *
+ * 0 a 3
+ * new: |-----------------| (bo_offset=n)
+ *
+ *
+ * 11) Existent mapping is split.
+ * ------------------------------
+ *
+ * 0 a 3
+ * old: |-----------------| (bo_offset=n)
+ *
+ * 1 b 2
+ * req: |-----| (bo_offset=m)
+ *
+ * 0 a 1 b 2 a' 3
+ * new: |-----|-----|-----|
(a.bo_offset=n,b.bo_offset=m,a'.bo_offset=n+2)
+ *
+ *
+ * 12) Existent mapping is kept.
+ * -----------------------------
+ *
+ * 0 a 3
+ * old: |-----------------| (bo_offset=n)
+ *
+ * 1 a 2
+ * req: |-----| (bo_offset=n+1)
+ *
+ * 0 a 3
+ * old: |-----------------| (bo_offset=n)
+ *
+ *
+ * 13) Existent mapping is replaced.
+ * ---------------------------------
+ *
+ * 1 a 2
+ * old: |-----| (bo_offset=n)
+ *
+ * 0 a 2
+ * req: |-----------| (bo_offset=n)
+ *
+ * 0 a 2
+ * new: |-----------| (bo_offset=n)
+ *
+ * Note: We expect to see the same result for a request with a
different bo
+ * and/or non-contiguous bo_offset.
+ *
+ *
+ * 14) Existent mapping is replaced.
+ * ---------------------------------
+ *
+ * 1 a 2
+ * old: |-----| (bo_offset=n)
+ *
+ * 0 a 3
+ * req: |----------------| (bo_offset=n)
+ *
+ * 0 a 3
+ * new: |----------------| (bo_offset=n)
+ *
+ * Note: We expect to see the same result for a request with a
different bo
+ * and/or non-contiguous bo_offset.
+ *
+ *
+ * 15) Existent mapping is split.
+ * ------------------------------
+ *
+ * 1 a 3
+ * old: |-----------| (bo_offset=n)
+ *
+ * 0 b 2
+ * req: |-----------| (bo_offset=m)
+ *
+ * 0 b 2 a' 3
+ * new: |-----------|-----| (b.bo_offset=m,a.bo_offset=n+2)
+ *
+ *
+ * 16) Existent mappings are merged.
+ * ---------------------------------
+ *
+ * 0 a 1
+ * old: |-----------| (bo_offset=n)
+ *
+ * 2 a 3
+ * old': |-----------| (bo_offset=n+2)
+ *
+ * 1 a 2
+ * req: |-----------| (bo_offset=n+1)
+ *
+ * a
+ * new: |----------------------------------| (bo_offset=n)
+ */
+
+/**
+ * DOC: Locking
+ *
+ * Generally, the GPU VA manager does not take care of locking
itself, it is
+ * the drivers responsibility to take care about locking. Drivers
might want to
+ * protect the following operations: inserting, destroying and iterating
+ * &drm_gpuva and &drm_gpuva_region objects as well as generating
split and merge
+ * operations.
+ *
+ * The GPU VA manager does take care of the locking of the backing
+ * &drm_gem_object buffers GPU VA lists though, unless the
provided functions
+ * documentation claims otherwise.
+ */
+
+/**
+ * drm_gpuva_manager_init - initialize a &drm_gpuva_manager
+ * @mgr: pointer to the &drm_gpuva_manager to initialize
+ * @name: the name of the GPU VA space
+ * @start_offset: the start offset of the GPU VA space
+ * @range: the size of the GPU VA space
+ * @reserve_offset: the start of the kernel reserved GPU VA area
+ * @reserve_range: the size of the kernel reserved GPU VA area
+ *
+ * The &drm_gpuva_manager must be initialized with this function
before use.
+ *
+ * Note that @mgr must be cleared to 0 before calling this
function. The given
+ * &name is expected to be managed by the surrounding driver structures.
+ */
+void
+drm_gpuva_manager_init(struct drm_gpuva_manager *mgr,
+ const char *name,
+ u64 start_offset, u64 range,
+ u64 reserve_offset, u64 reserve_range)
+{
+ drm_mm_init(&mgr->va_mm, start_offset, range);
+ drm_mm_init(&mgr->region_mm, start_offset, range);
+
+ mgr->mm_start = start_offset;
+ mgr->mm_range = range;
+
+ mgr->name = name ? name : "unknown";
+
+ memset(&mgr->kernel_alloc_node, 0, sizeof(struct drm_mm_node));
+ mgr->kernel_alloc_node.start = reserve_offset;
+ mgr->kernel_alloc_node.size = reserve_range;
+ drm_mm_reserve_node(&mgr->region_mm, &mgr->kernel_alloc_node);
+}
+EXPORT_SYMBOL(drm_gpuva_manager_init);
+
+/**
+ * drm_gpuva_manager_destroy - cleanup a &drm_gpuva_manager
+ * @mgr: pointer to the &drm_gpuva_manager to clean up
+ *
+ * Note that it is a bug to call this function on a manager that still
+ * holds GPU VA mappings.
+ */
+void
+drm_gpuva_manager_destroy(struct drm_gpuva_manager *mgr)
+{
+ mgr->name = NULL;
+ drm_mm_remove_node(&mgr->kernel_alloc_node);
+ drm_mm_takedown(&mgr->va_mm);
+ drm_mm_takedown(&mgr->region_mm);
+}
+EXPORT_SYMBOL(drm_gpuva_manager_destroy);
+
+static struct drm_gpuva_region *
+drm_gpuva_in_region(struct drm_gpuva_manager *mgr, u64 addr, u64 range)
+{
+ struct drm_gpuva_region *reg;
+
+ /* Find the VA region the requested range is strictly
enclosed by. */
+ drm_gpuva_for_each_region_in_range(reg, mgr, addr, addr + range) {
+ if (reg->node.start <= addr &&
+ reg->node.start + reg->node.size >= addr + range &&
+ ®->node != &mgr->kernel_alloc_node)
+ return reg;
+ }
+
+ return NULL;
+}
+
+static bool
+drm_gpuva_in_any_region(struct drm_gpuva_manager *mgr, u64 addr,
u64 range)
+{
+ return !!drm_gpuva_in_region(mgr, addr, range);
+}
+
+/**
+ * drm_gpuva_insert - insert a &drm_gpuva
+ * @mgr: the &drm_gpuva_manager to insert the &drm_gpuva in
+ * @va: the &drm_gpuva to insert
+ * @addr: the start address of the GPU VA
+ * @range: the range of the GPU VA
+ *
+ * Insert a &drm_gpuva with a given address and range into a
+ * &drm_gpuva_manager.
+ *
+ * The function assumes the caller does not hold the &drm_gem_object's
+ * GPU VA list mutex.
+ *
+ * Returns: 0 on success, negative error code on failure.
+ */
+int
+drm_gpuva_insert(struct drm_gpuva_manager *mgr,
+ struct drm_gpuva *va,
+ u64 addr, u64 range)
+{
+ struct drm_gpuva_region *reg;
+ int ret;
+
+ if (!va->gem.obj)
+ return -EINVAL;
+
+ reg = drm_gpuva_in_region(mgr, addr, range);
+ if (!reg)
+ return -EINVAL;
+
+ ret = drm_mm_insert_node_in_range(&mgr->va_mm, &va->node,
+ range, 0,
+ 0, addr,
+ addr + range,
+ DRM_MM_INSERT_LOW|DRM_MM_INSERT_ONCE);
+ if (ret)
+ return ret;
+
+ va->mgr = mgr;
+ va->region = reg;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_gpuva_insert);
+
+/**
+ * drm_gpuva_link_locked - link a &drm_gpuva
+ * @va: the &drm_gpuva to link
+ *
+ * This adds the given &va to the GPU VA list of the
&drm_gem_object it is
+ * associated with.
+ *
+ * The function assumes the caller already holds the &drm_gem_object's
+ * GPU VA list mutex.
+ */
+void
+drm_gpuva_link_locked(struct drm_gpuva *va)
+{
+ lockdep_assert_held(&va->gem.obj->gpuva.mutex);
+ list_add_tail(&va->head, &va->gem.obj->gpuva.list);
+}
+EXPORT_SYMBOL(drm_gpuva_link_locked);
+
+/**
+ * drm_gpuva_link_unlocked - unlink a &drm_gpuva
+ * @va: the &drm_gpuva to unlink
+ *
+ * This adds the given &va to the GPU VA list of the
&drm_gem_object it is
+ * associated with.
+ *
+ * The function assumes the caller does not hold the &drm_gem_object's
+ * GPU VA list mutex.
+ */
+void
+drm_gpuva_link_unlocked(struct drm_gpuva *va)
+{
+ drm_gem_gpuva_lock(va->gem.obj);
+ drm_gpuva_link_locked(va);
+ drm_gem_gpuva_unlock(va->gem.obj);
+}
+EXPORT_SYMBOL(drm_gpuva_link_unlocked);
+
+/**
+ * drm_gpuva_unlink_locked - unlink a &drm_gpuva
+ * @va: the &drm_gpuva to unlink
+ *
+ * This removes the given &va from the GPU VA list of the
&drm_gem_object it is
+ * associated with.
+ *
+ * The function assumes the caller already holds the &drm_gem_object's
+ * GPU VA list mutex.
+ */
+void
+drm_gpuva_unlink_locked(struct drm_gpuva *va)
+{
+ lockdep_assert_held(&va->gem.obj->gpuva.mutex);
+ list_del_init(&va->head);
+}
+EXPORT_SYMBOL(drm_gpuva_unlink_locked);
+
+/**
+ * drm_gpuva_unlink_unlocked - unlink a &drm_gpuva
+ * @va: the &drm_gpuva to unlink
+ *
+ * This removes the given &va from the GPU VA list of the
&drm_gem_object it is
+ * associated with.
+ *
+ * The function assumes the caller does not hold the &drm_gem_object's
+ * GPU VA list mutex.
+ */
+void
+drm_gpuva_unlink_unlocked(struct drm_gpuva *va)
+{
+ drm_gem_gpuva_lock(va->gem.obj);
+ drm_gpuva_unlink_locked(va);
+ drm_gem_gpuva_unlock(va->gem.obj);
+}
+EXPORT_SYMBOL(drm_gpuva_unlink_unlocked);
+
+/**
+ * drm_gpuva_destroy_locked - destroy a &drm_gpuva
+ * @va: the &drm_gpuva to destroy
+ *
+ * This removes the given &va from GPU VA list of the
&drm_gem_object it is
+ * associated with and removes it from the underlaying range allocator.
+ *
+ * The function assumes the caller already holds the &drm_gem_object's
+ * GPU VA list mutex.
+ */
+void
+drm_gpuva_destroy_locked(struct drm_gpuva *va)
+{
+ lockdep_assert_held(&va->gem.obj->gpuva.mutex);
+
+ list_del(&va->head);
+ drm_mm_remove_node(&va->node);
+}
+EXPORT_SYMBOL(drm_gpuva_destroy_locked);
+
+/**
+ * drm_gpuva_destroy_unlocked - destroy a &drm_gpuva
+ * @va: the &drm_gpuva to destroy
+ *
+ * This removes the given &va from GPU VA list of the
&drm_gem_object it is
+ * associated with and removes it from the underlaying range allocator.
+ *
+ * The function assumes the caller does not hold the &drm_gem_object's
+ * GPU VA list mutex.
+ */
+void
+drm_gpuva_destroy_unlocked(struct drm_gpuva *va)
+{
+ drm_gem_gpuva_lock(va->gem.obj);
+ list_del(&va->head);
+ drm_gem_gpuva_unlock(va->gem.obj);
+
+ drm_mm_remove_node(&va->node);
+}
+EXPORT_SYMBOL(drm_gpuva_destroy_unlocked);
+
+/**
+ * drm_gpuva_find - find a &drm_gpuva
+ * @mgr: the &drm_gpuva_manager to search in
+ * @addr: the &drm_gpuvas address
+ * @range: the &drm_gpuvas range
+ *
+ * Returns: the &drm_gpuva at a given &addr and with a given &range
+ */
+struct drm_gpuva *
+drm_gpuva_find(struct drm_gpuva_manager *mgr,
+ u64 addr, u64 range)
+{
+ struct drm_gpuva *va;
+
+ drm_gpuva_for_each_va_in_range(va, mgr, addr, range) {
+ if (va->node.start == addr &&
+ va->node.size == range)
+ return va;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(drm_gpuva_find);
+
+/**
+ * drm_gpuva_find_prev - find the &drm_gpuva before the given address
+ * @mgr: the &drm_gpuva_manager to search in
+ * @start: the given GPU VA's start address
+ *
+ * Find the adjacent &drm_gpuva before the GPU VA with given
&start address.
+ *
+ * Note that if there is any free space between the GPU VA
mappings no mapping
+ * is returned.
+ *
+ * Returns: a pointer to the found &drm_gpuva or NULL if none was found
+ */
+struct drm_gpuva *
+drm_gpuva_find_prev(struct drm_gpuva_manager *mgr, u64 start)
+{
+ struct drm_mm_node *node;
+
+ if (start <= mgr->mm_start ||
+ start > (mgr->mm_start + mgr->mm_range))
+ return NULL;
+
+ node = __drm_mm_interval_first(&mgr->va_mm, start - 1, start);
+ if (node == &mgr->va_mm.head_node)
+ return NULL;
+
+ return (struct drm_gpuva *)node;
+}
+EXPORT_SYMBOL(drm_gpuva_find_prev);
+
+/**
+ * drm_gpuva_find_next - find the &drm_gpuva after the given address
+ * @mgr: the &drm_gpuva_manager to search in
+ * @end: the given GPU VA's end address
+ *
+ * Find the adjacent &drm_gpuva after the GPU VA with given &end
address.
+ *
+ * Note that if there is any free space between the GPU VA
mappings no mapping
+ * is returned.
+ *
+ * Returns: a pointer to the found &drm_gpuva or NULL if none was found
+ */
+struct drm_gpuva *
+drm_gpuva_find_next(struct drm_gpuva_manager *mgr, u64 end)
+{
+ struct drm_mm_node *node;
+
+ if (end < mgr->mm_start ||
+ end >= (mgr->mm_start + mgr->mm_range))
+ return NULL;
+
+ node = __drm_mm_interval_first(&mgr->va_mm, end, end + 1);
+ if (node == &mgr->va_mm.head_node)
+ return NULL;
+
+ return (struct drm_gpuva *)node;
+}
+EXPORT_SYMBOL(drm_gpuva_find_next);
+
+/**
+ * drm_gpuva_region_insert - insert a &drm_gpuva_region
+ * @mgr: the &drm_gpuva_manager to insert the &drm_gpuva in
+ * @reg: the &drm_gpuva_region to insert
+ * @addr: the start address of the GPU VA
+ * @range: the range of the GPU VA
+ *
+ * Insert a &drm_gpuva_region with a given address and range into a
+ * &drm_gpuva_manager.
+ *
+ * Returns: 0 on success, negative error code on failure.
+ */
+int
+drm_gpuva_region_insert(struct drm_gpuva_manager *mgr,
+ struct drm_gpuva_region *reg,
+ u64 addr, u64 range)
+{
+ int ret;
+
+ ret = drm_mm_insert_node_in_range(&mgr->region_mm, ®->node,
+ range, 0,
+ 0, addr,
+ addr + range,
+ DRM_MM_INSERT_LOW|
+ DRM_MM_INSERT_ONCE);
+ if (ret)
+ return ret;
+
+ reg->mgr = mgr;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_gpuva_region_insert);
+
+/**
+ * drm_gpuva_region_destroy - destroy a &drm_gpuva_region
+ * @mgr: the &drm_gpuva_manager holding the region
+ * @reg: the &drm_gpuva to destroy
+ *
+ * This removes the given ® from the underlaying range allocator.
+ */
+void
+drm_gpuva_region_destroy(struct drm_gpuva_manager *mgr,
+ struct drm_gpuva_region *reg)
+{
+ struct drm_gpuva *va;
+
+ drm_gpuva_for_each_va_in_range(va, mgr,
+ reg->node.start,
+ reg->node.size) {
+ WARN(1, "GPU VA region must be empty on destroy.\n");
+ return;
+ }
+
+ if (®->node == &mgr->kernel_alloc_node) {
+ WARN(1, "Can't destroy kernel reserved region.\n");
+ return;
+ }
+
+ drm_mm_remove_node(®->node);
+}
+EXPORT_SYMBOL(drm_gpuva_region_destroy);
+
+/**
+ * drm_gpuva_region_find - find a &drm_gpuva_region
+ * @mgr: the &drm_gpuva_manager to search in
+ * @addr: the &drm_gpuva_regions address
+ * @range: the &drm_gpuva_regions range
+ *
+ * Returns: the &drm_gpuva_region at a given &addr and with a
given &range
+ */
+struct drm_gpuva_region *
+drm_gpuva_region_find(struct drm_gpuva_manager *mgr,
+ u64 addr, u64 range)
+{
+ struct drm_gpuva_region *reg;
+
+ drm_gpuva_for_each_region_in_range(reg, mgr, addr, addr + range)
+ if (reg->node.start == addr &&
+ reg->node.size == range)
+ return reg;
+
+ return NULL;
+}
+EXPORT_SYMBOL(drm_gpuva_region_find);
+
+static int
+gpuva_op_map_new(struct drm_gpuva_op **pop,
+ u64 addr, u64 range,
+ struct drm_gem_object *obj, u64 offset)
+{
+ struct drm_gpuva_op *op;
+
+ op = *pop = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ op->op = DRM_GPUVA_OP_MAP;
+ op->map.va.addr = addr;
+ op->map.va.range = range;
+ op->map.gem.obj = obj;
+ op->map.gem.offset = offset;
+
+ return 0;
+}
+
+static int
+gpuva_op_remap_new(struct drm_gpuva_op **pop,
+ struct drm_gpuva_op_map *prev,
+ struct drm_gpuva_op_map *next,
+ struct drm_gpuva_op_unmap *unmap)
+{
+ struct drm_gpuva_op *op;
+ struct drm_gpuva_op_remap *r;
+
+ op = *pop = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ op->op = DRM_GPUVA_OP_REMAP;
+ r = &op->remap;
+
+ if (prev) {
+ r->prev = kmemdup(prev, sizeof(*prev), GFP_KERNEL);
+ if (!r->prev)
+ goto err_free_op;
+ }
+
+ if (next) {
+ r->next = kmemdup(next, sizeof(*next), GFP_KERNEL);
+ if (!r->next)
+ goto err_free_prev;
+ }
+
+ r->unmap = kmemdup(unmap, sizeof(*unmap), GFP_KERNEL);
+ if (!r->unmap)
+ goto err_free_next;
+
+ return 0;
+
+err_free_next:
+ if (next)
+ kfree(r->next);
+err_free_prev:
+ if (prev)
+ kfree(r->prev);
+err_free_op:
+ kfree(op);
+ *pop = NULL;
+
+ return -ENOMEM;
+}
+
+static int
+gpuva_op_unmap_new(struct drm_gpuva_op **pop,
+ struct drm_gpuva *va, bool merge)
+{
+ struct drm_gpuva_op *op;
+
+ op = *pop = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ op->op = DRM_GPUVA_OP_UNMAP;
+ op->unmap.va = va;
+ op->unmap.keep = merge;
+
+ return 0;
+}
+
+#define op_map_new_to_list(_ops, _addr, _range, \
+ _obj, _offset) \
+do { \
+ struct drm_gpuva_op *op; \
+ \
+ ret = gpuva_op_map_new(&op, _addr, _range, \
+ _obj, _offset); \
+ if (ret) \
+ goto err_free_ops; \
+ \
+ list_add_tail(&op->entry, _ops); \
+} while (0)
+
+#define op_remap_new_to_list(_ops, _prev, _next, \
+ _unmap) \
+do { \
+ struct drm_gpuva_op *op; \
+ \
+ ret = gpuva_op_remap_new(&op, _prev, _next, \
+ _unmap); \
+ if (ret) \
+ goto err_free_ops; \
+ \
+ list_add_tail(&op->entry, _ops); \
+} while (0)
+
+#define op_unmap_new_to_list(_ops, _gpuva, _merge) \
+do { \
+ struct drm_gpuva_op *op; \
+ \
+ ret = gpuva_op_unmap_new(&op, _gpuva, _merge); \
+ if (ret) \
+ goto err_free_ops; \
+ \
+ list_add_tail(&op->entry, _ops); \
+} while (0)
+
+/**
+ * drm_gpuva_sm_map_ops_create - creates the &drm_gpuva_ops to
split and merge
+ * @mgr: the &drm_gpuva_manager representing the GPU VA space
+ * @req_addr: the start address of the new mapping
+ * @req_range: the range of the new mapping
+ * @req_obj: the &drm_gem_object to map
+ * @req_offset: the offset within the &drm_gem_object
+ *
+ * This function creates a list of operations to perform
splitting and merging
+ * of existent mapping(s) with the newly requested one.
+ *
+ * The list can be iterated with &drm_gpuva_for_each_op and must
be processed
+ * in the given order. It can contain map, unmap and remap
operations, but it
+ * also can be empty if no operation is required, e.g. if the
requested mapping
+ * already exists is the exact same way.
+ *
+ * There can be an arbitrary amount of unmap operations, a
maximum of two remap
+ * operations and a single map operation. The latter one, if existent,
+ * represents the original map operation requested by the caller.
Please note
+ * that the map operation might has been modified, e.g. if it was
+ * merged with an existent mapping.
+ *
+ * Note that before calling this function again with another
mapping request it
+ * is necessary to update the &drm_gpuva_manager's view of the
GPU VA space.
+ * The previously obtained operations must be either processed or
abandoned.
+ * To update the &drm_gpuva_manager's view of the GPU VA space
+ * drm_gpuva_insert(), drm_gpuva_destroy_locked() and/or
+ * drm_gpuva_destroy_unlocked() should be used.
+ *
+ * After the caller finished processing the returned
&drm_gpuva_ops, they must
+ * be freed with &drm_gpuva_ops_free.
+ *
+ * Returns: a pointer to the &drm_gpuva_ops on success, an
ERR_PTR on failure
+ */
+struct drm_gpuva_ops *
+drm_gpuva_sm_map_ops_create(struct drm_gpuva_manager *mgr,
+ u64 req_addr, u64 req_range,
+ struct drm_gem_object *req_obj, u64 req_offset)
+{
+ struct drm_gpuva_ops *ops;
+ struct drm_gpuva *va, *prev = NULL;
+ u64 req_end = req_addr + req_range;
+ bool skip_pmerge = false, skip_nmerge = false;
+ int ret;
+
+ if (!drm_gpuva_in_any_region(mgr, req_addr, req_range))
+ return ERR_PTR(-EINVAL);
+
+ ops = kzalloc(sizeof(*ops), GFP_KERNEL);
+ if (!ops)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&ops->list);
+
+ drm_gpuva_for_each_va_in_range(va, mgr, req_addr, req_end) {
+ struct drm_gem_object *obj = va->gem.obj;
+ u64 offset = va->gem.offset;
+ u64 addr = va->node.start;
+ u64 range = va->node.size;
+ u64 end = addr + range;
+
+ /* Generally, we want to skip merging with potential mappings
+ * left and right of the requested one when we found a
+ * collision, since merging happens in this loop already.
+ *
+ * However, there is one exception when the requested mapping
+ * spans into a free VM area. If this is the case we might
+ * still hit the boundary of another mapping before and/or
+ * after the free VM area.
+ */
+ skip_pmerge = true;
+ skip_nmerge = true;
+
+ if (addr == req_addr) {
+ bool merge = obj == req_obj &&
+ offset == req_offset;
+ if (end == req_end) {
+ if (merge)
+ goto done;
+
+ op_unmap_new_to_list(&ops->list, va, false);
+ break;
+ }
+
+ if (end < req_end) {
+ skip_nmerge = false;
+ op_unmap_new_to_list(&ops->list, va, merge);
+ goto next;
+ }
+
+ if (end > req_end) {
+ struct drm_gpuva_op_map n = {
+ .va.addr = req_end,
+ .va.range = range - req_range,
+ .gem.obj = obj,
+ .gem.offset = offset + req_range,
+ };
+ struct drm_gpuva_op_unmap u = { .va = va };
+
+ if (merge)
+ goto done;
+
+ op_remap_new_to_list(&ops->list, NULL, &n, &u);
+ break;
+ }
+ } else if (addr < req_addr) {
+ u64 ls_range = req_addr - addr;
+ struct drm_gpuva_op_map p = {
+ .va.addr = addr,
+ .va.range = ls_range,
+ .gem.obj = obj,
+ .gem.offset = offset,
+ };
+ struct drm_gpuva_op_unmap u = { .va = va };
+ bool merge = obj == req_obj &&
+ offset + ls_range == req_offset;
+
+ if (end == req_end) {
+ if (merge)
+ goto done;
+
+ op_remap_new_to_list(&ops->list, &p, NULL, &u);
+ break;
+ }
+
+ if (end < req_end) {
+ u64 new_addr = addr;
+ u64 new_range = req_range + ls_range;
+ u64 new_offset = offset;
+
+ /* We validated that the requested mapping is
+ * within a single VA region already.
+ * Since it overlaps the current mapping (which
+ * can't cross a VA region boundary) we can be
+ * sure that we're still within the boundaries
+ * of the same VA region after merging.
+ */
+ if (merge) {
+ req_offset = new_offset;
+ req_addr = new_addr;
+ req_range = new_range;
+ op_unmap_new_to_list(&ops->list, va, true);
+ goto next;
+ }
+
+ op_remap_new_to_list(&ops->list, &p, NULL, &u);
+ goto next;
+ }
+
+ if (end > req_end) {
+ struct drm_gpuva_op_map n = {
+ .va.addr = req_end,
+ .va.range = end - req_end,
+ .gem.obj = obj,
+ .gem.offset = offset + ls_range +
+ req_range,
+ };
+
+ if (merge)
+ goto done;
+
+ op_remap_new_to_list(&ops->list, &p, &n, &u);
+ break;
+ }
+ } else if (addr > req_addr) {
+ bool merge = obj == req_obj &&
+ offset == req_offset +
+ (addr - req_addr);
+ if (!prev)
+ skip_pmerge = false;
+
+ if (end == req_end) {
+ op_unmap_new_to_list(&ops->list, va, merge);
+ break;
+ }
+
+ if (end < req_end) {
+ skip_nmerge = false;
+ op_unmap_new_to_list(&ops->list, va, merge);
+ goto next;
+ }
+
+ if (end > req_end) {
+ struct drm_gpuva_op_map n = {
+ .va.addr = req_end,
+ .va.range = end - req_end,
+ .gem.obj = obj,
+ .gem.offset = offset + req_end - addr,
+ };
+ struct drm_gpuva_op_unmap u = { .va = va };
+ u64 new_end = end;
+ u64 new_range = new_end - req_addr;
+
+ /* We validated that the requested mapping is
+ * within a single VA region already.
+ * Since it overlaps the current mapping (which
+ * can't cross a VA region boundary) we can be
+ * sure that we're still within the boundaries
+ * of the same VA region after merging.
+ */
+ if (merge) {
+ req_end = new_end;
+ req_range = new_range;
+ op_unmap_new_to_list(&ops->list, va, true);
+ break;
+ }
+
+ op_remap_new_to_list(&ops->list, NULL, &n, &u);
+ break;
+ }
+ }
+next:
+ prev = va;
+ }
+
+ va = skip_pmerge ? NULL : drm_gpuva_find_prev(mgr, req_addr);
+ if (va) {
+ struct drm_gem_object *obj = va->gem.obj;
+ u64 offset = va->gem.offset;
+ u64 addr = va->node.start;
+ u64 range = va->node.size;
+ u64 new_offset = offset;
+ u64 new_addr = addr;
+ u64 new_range = req_range + range;
+ bool merge = obj == req_obj &&
+ offset + range == req_offset;
+
+ /* Don't merge over VA region boundaries. */
+ merge &= drm_gpuva_in_any_region(mgr, new_addr, new_range);
+ if (merge) {
+ op_unmap_new_to_list(&ops->list, va, true);
+
+ req_offset = new_offset;
+ req_addr = new_addr;
+ req_range = new_range;
+ }
+ }
+
+ va = skip_nmerge ? NULL : drm_gpuva_find_next(mgr, req_end);
+ if (va) {
+ struct drm_gem_object *obj = va->gem.obj;
+ u64 offset = va->gem.offset;
+ u64 addr = va->node.start;
+ u64 range = va->node.size;
+ u64 end = addr + range;
+ u64 new_range = req_range + range;
+ u64 new_end = end;
+ bool merge = obj == req_obj &&
+ offset == req_offset + req_range;
+
+ /* Don't merge over VA region boundaries. */
+ merge &= drm_gpuva_in_any_region(mgr, req_addr, new_range);
+ if (merge) {
+ op_unmap_new_to_list(&ops->list, va, true);
+
+ req_range = new_range;
+ req_end = new_end;
+ }
+ }
+
+ op_map_new_to_list(&ops->list,
+ req_addr, req_range,
+ req_obj, req_offset);
+
+done:
+ return ops;
+
+err_free_ops:
+ drm_gpuva_ops_free(ops);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(drm_gpuva_sm_map_ops_create);
+
+#undef op_map_new_to_list
+#undef op_remap_new_to_list
+#undef op_unmap_new_to_list
+
+/**
+ * drm_gpuva_sm_unmap_ops_create - creates the &drm_gpuva_ops to
split on unmap
+ * @mgr: the &drm_gpuva_manager representing the GPU VA space
+ * @req_addr: the start address of the range to unmap
+ * @req_range: the range of the mappings to unmap
+ *
+ * This function creates a list of operations to perform
unmapping and, if
+ * required, splitting of the mappings overlapping the unmap range.
+ *
+ * The list can be iterated with &drm_gpuva_for_each_op and must
be processed
+ * in the given order. It can contain unmap and remap operations,
depending on
+ * whether there are actual overlapping mappings to split.
+ *
+ * There can be an arbitrary amount of unmap operations and a
maximum of two
+ * remap operations.
+ *
+ * Note that before calling this function again with another
range to unmap it
+ * is necessary to update the &drm_gpuva_manager's view of the
GPU VA space.
+ * The previously obtained operations must be processed or abandoned.
+ * To update the &drm_gpuva_manager's view of the GPU VA space
+ * drm_gpuva_insert(), drm_gpuva_destroy_locked() and/or
+ * drm_gpuva_destroy_unlocked() should be used.
+ *
+ * After the caller finished processing the returned
&drm_gpuva_ops, they must
+ * be freed with &drm_gpuva_ops_free.
+ *
+ * Returns: a pointer to the &drm_gpuva_ops on success, an
ERR_PTR on failure
+ */
+struct drm_gpuva_ops *
+drm_gpuva_sm_unmap_ops_create(struct drm_gpuva_manager *mgr,
+ u64 req_addr, u64 req_range)
+{
+ struct drm_gpuva_ops *ops;
+ struct drm_gpuva_op *op;
+ struct drm_gpuva_op_remap *r;
+ struct drm_gpuva *va;
+ u64 req_end = req_addr + req_range;
+ int ret;
+
+ ops = kzalloc(sizeof(*ops), GFP_KERNEL);
+ if (!ops)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&ops->list);
+
+ drm_gpuva_for_each_va_in_range(va, mgr, req_addr, req_end) {
+ struct drm_gem_object *obj = va->gem.obj;
+ u64 offset = va->gem.offset;
+ u64 addr = va->node.start;
+ u64 range = va->node.size;
+ u64 end = addr + range;
+
+ op = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op) {
+ ret = -ENOMEM;
+ goto err_free_ops;
+ }
+
+ r = &op->remap;
+
+ if (addr < req_addr) {
+ r->prev = kzalloc(sizeof(*r->prev), GFP_KERNEL);
+ if (!r->prev) {
+ ret = -ENOMEM;
+ goto err_free_op;
+ }
+
+ r->prev->va.addr = addr;
+ r->prev->va.range = req_addr - addr;
+ r->prev->gem.obj = obj;
+ r->prev->gem.offset = offset;
+ }
+
+ if (end > req_end) {
+ r->next = kzalloc(sizeof(*r->next), GFP_KERNEL);
+ if (!r->next) {
+ ret = -ENOMEM;
+ goto err_free_prev;
+ }
+
+ r->next->va.addr = req_end;
+ r->next->va.range = end - req_end;
+ r->next->gem.obj = obj;
+ r->next->gem.offset = offset + (req_end - addr);
+ }
+
+ if (op->remap.prev || op->remap.next) {
+ op->op = DRM_GPUVA_OP_REMAP;
+ r->unmap = kzalloc(sizeof(*r->unmap), GFP_KERNEL);
+ if (!r->unmap) {
+ ret = -ENOMEM;
+ goto err_free_next;
+ }
+
+ r->unmap->va = va;
+ } else {
+ op->op = DRM_GPUVA_OP_UNMAP;
+ op->unmap.va = va;
+ }
+
+ list_add_tail(&op->entry, &ops->list);
+ }
+
+ return ops;
+
+err_free_next:
+ if (r->next)
+ kfree(r->next);
+err_free_prev:
+ if (r->prev)
+ kfree(r->prev);
+err_free_op:
+ kfree(op);
+err_free_ops:
+ drm_gpuva_ops_free(ops);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(drm_gpuva_sm_unmap_ops_create);
+
+/**
+ * drm_gpuva_ops_free - free the given &drm_gpuva_ops
+ * @ops: the &drm_gpuva_ops to free
+ *
+ * Frees the given &drm_gpuva_ops structure including all the ops
associated
+ * with it.
+ */
+void
+drm_gpuva_ops_free(struct drm_gpuva_ops *ops)
+{
+ struct drm_gpuva_op *op, *next;
+
+ drm_gpuva_for_each_op_safe(op, next, ops) {
+ list_del(&op->entry);
+ if (op->op == DRM_GPUVA_OP_REMAP) {
+ if (op->remap.prev)
+ kfree(op->remap.prev);
+
+ if (op->remap.next)
+ kfree(op->remap.next);
+
+ kfree(op->remap.unmap);
+ }
+ kfree(op);
+ }
+
+ kfree(ops);
+}
+EXPORT_SYMBOL(drm_gpuva_ops_free);
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index d7c521e8860f..6feacd93aca6 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -104,6 +104,12 @@ enum drm_driver_feature {
* acceleration should be handled by two drivers that are
connected using auxiliary bus.
*/
DRIVER_COMPUTE_ACCEL = BIT(7),
+ /**
+ * @DRIVER_GEM_GPUVA:
+ *
+ * Driver supports user defined GPU VA bindings for GEM objects.
+ */
+ DRIVER_GEM_GPUVA = BIT(8),
/* IMPORTANT: Below are all the legacy flags, add new ones above. */
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 772a4adf5287..4a3679034966 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -36,6 +36,8 @@
#include <linux/kref.h>
#include <linux/dma-resv.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
#include <drm/drm_vma_manager.h>
@@ -337,6 +339,17 @@ struct drm_gem_object {
*/
struct dma_resv _resv;
+ /**
+ * @gpuva:
+ *
+ * Provides the list and list mutex of GPU VAs attached to this
+ * GEM object.
+ */
+ struct {
+ struct list_head list;
+ struct mutex mutex;
+ } gpuva;
+
/**
* @funcs:
*
@@ -479,4 +492,66 @@ void drm_gem_lru_move_tail(struct drm_gem_lru
*lru, struct drm_gem_object *obj);
unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned
nr_to_scan,
bool (*shrink)(struct drm_gem_object *obj));
+/**
+ * drm_gem_gpuva_init - initialize the gpuva list of a GEM object
+ * @obj: the &drm_gem_object
+ *
+ * This initializes the &drm_gem_object's &drm_gpuva list and the mutex
+ * protecting it.
+ *
+ * Calling this function is only necessary for drivers intending
to support the
+ * &drm_driver_feature DRIVER_GEM_GPUVA.
+ */
+static inline void drm_gem_gpuva_init(struct drm_gem_object *obj)
+{
+ INIT_LIST_HEAD(&obj->gpuva.list);
+ mutex_init(&obj->gpuva.mutex);
+}
+
+/**
+ * drm_gem_gpuva_lock - lock the GEM's gpuva list mutex
+ * @obj: the &drm_gem_object
+ *
+ * This unlocks the mutex protecting the &drm_gem_object's
&drm_gpuva list.
+ */
+static inline void drm_gem_gpuva_lock(struct drm_gem_object *obj)
+{
+ mutex_lock(&obj->gpuva.mutex);
+}
+
+/**
+ * drm_gem_gpuva_unlock - unlock the GEM's gpuva list mutex
+ * @obj: the &drm_gem_object
+ *
+ * This unlocks the mutex protecting the &drm_gem_object's
&drm_gpuva list.
+ */
+static inline void drm_gem_gpuva_unlock(struct drm_gem_object *obj)
+{
+ mutex_unlock(&obj->gpuva.mutex);
+}
+
+/**
+ * drm_gem_for_each_gpuva - iternator to walk over a list of gpuvas
+ * @entry: &drm_gpuva structure to assign to in each iteration step
+ * @obj: the &drm_gem_object the &drm_gpuvas to walk are associated with
+ *
+ * This iterator walks over all &drm_gpuva structures associated
with the
+ * &drm_gpuva_manager.
+ */
+#define drm_gem_for_each_gpuva(entry, obj) \
+ list_for_each_entry(entry, &obj->gpuva.list, head)
+
+/**
+ * drm_gem_for_each_gpuva_safe - iternator to safely walk over a
list of gpuvas
+ * @entry: &drm_gpuva structure to assign to in each iteration step
+ * @next: &next &drm_gpuva to store the next step
+ * @obj: the &drm_gem_object the &drm_gpuvas to walk are associated with
+ *
+ * This iterator walks over all &drm_gpuva structures associated
with the
+ * &drm_gem_object. It is implemented with
list_for_each_entry_safe(), hence
+ * it is save against removal of elements.
+ */
+#define drm_gem_for_each_gpuva_safe(entry, next, obj) \
+ list_for_each_entry_safe(entry, next, &obj->gpuva.list, head)
+
#endif /* __DRM_GEM_H__ */
diff --git a/include/drm/drm_gpuva_mgr.h b/include/drm/drm_gpuva_mgr.h
new file mode 100644
index 000000000000..adeb0c916e91
--- /dev/null
+++ b/include/drm/drm_gpuva_mgr.h
@@ -0,0 +1,527 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#ifndef __DRM_GPUVA_MGR_H__
+#define __DRM_GPUVA_MGR_H__
+
+/*
+ * Copyright (c) 2022 Red Hat.
+ *
+ * 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 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
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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/drm_mm.h>
+#include <linux/mm.h>
+#include <linux/rbtree.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+struct drm_gpuva_region;
+struct drm_gpuva;
+struct drm_gpuva_ops;
+
+/**
+ * struct drm_gpuva_manager - DRM GPU VA Manager
+ *
+ * The DRM GPU VA Manager keeps track of a GPU's virtual address
space by using
+ * the &drm_mm range allocator. Typically, this structure is
embedded in bigger
+ * driver structures.
+ *
+ * Drivers can pass addresses and ranges in an arbitrary unit,
e.g. bytes or
+ * pages.
+ *
+ * There should be one manager instance per GPU virtual address space.
+ */
+struct drm_gpuva_manager {
+ /**
+ * @name: the name of the DRM GPU VA space
+ */
+ const char *name;
+
+ /**
+ * @mm_start: start of the VA space
+ */
+ u64 mm_start;
+
+ /**
+ * @mm_range: length of the VA space
+ */
+ u64 mm_range;
+
+ /**
+ * @region_mm: the &drm_mm range allocator to track GPU VA regions
+ */
+ struct drm_mm region_mm;
+
+ /**
+ * @va_mm: the &drm_mm range allocator to track GPU VA mappings
+ */
+ struct drm_mm va_mm;
+
+ /**
+ * @kernel_alloc_node:
+ *
+ * &drm_mm_node representing the address space cutout reserved for
+ * the kernel
+ */
+ struct drm_mm_node kernel_alloc_node;
+};
+
+void drm_gpuva_manager_init(struct drm_gpuva_manager *mgr,
+ const char *name,
+ u64 start_offset, u64 range,
+ u64 reserve_offset, u64 reserve_range);
+void drm_gpuva_manager_destroy(struct drm_gpuva_manager *mgr);
+
+/**
+ * struct drm_gpuva_region - structure to track a portion of GPU
VA space
+ *
+ * This structure represents a portion of a GPUs VA space and is
associated
+ * with a &drm_gpuva_manager. Internally it is based on a &drm_mm_node.
+ *
+ * GPU VA mappings, represented by &drm_gpuva objects, are
restricted to be
+ * placed within a &drm_gpuva_region.
+ */
+struct drm_gpuva_region {
+ /**
+ * @node: the &drm_mm_node to track the GPU VA region
+ */
+ struct drm_mm_node node;
+
+ /**
+ * @mgr: the &drm_gpuva_manager this object is associated with
+ */
+ struct drm_gpuva_manager *mgr;
+
+ /**
+ * @sparse: indicates whether this region is sparse
+ */
+ bool sparse;
+};
+
+struct drm_gpuva_region *
+drm_gpuva_region_find(struct drm_gpuva_manager *mgr,
+ u64 addr, u64 range);
+int drm_gpuva_region_insert(struct drm_gpuva_manager *mgr,
+ struct drm_gpuva_region *reg,
+ u64 addr, u64 range);
+void drm_gpuva_region_destroy(struct drm_gpuva_manager *mgr,
+ struct drm_gpuva_region *reg);
+
+int drm_gpuva_insert(struct drm_gpuva_manager *mgr,
+ struct drm_gpuva *va,
+ u64 addr, u64 range);
+/**
+ * drm_gpuva_for_each_region_in_range - iternator to walk over a
range of nodes
+ * @node__: &drm_gpuva_region structure to assign to in each
iteration step
+ * @gpuva__: &drm_gpuva_manager structure to walk
+ * @start__: starting offset, the first node will overlap this
+ * @end__: ending offset, the last node will start before this
(but may overlap)
+ *
+ * This iterator walks over all nodes in the range allocator that lie
+ * between @start and @end. It is implemented similarly to
list_for_each(),
+ * but is using &drm_mm's internal interval tree to accelerate
the search for
+ * the starting node, and hence isn't safe against removal of
elements. It
+ * assumes that @end is within (or is the upper limit of) the
&drm_gpuva_manager.
+ * If [@start, @end] are beyond the range of the &drm_gpuva_manager, the
+ * iterator may walk over the special _unallocated_
&drm_mm.head_node of the
+ * backing &drm_mm, and may even continue indefinitely.
+ */
+#define drm_gpuva_for_each_region_in_range(node__, gpuva__,
start__, end__) \
+ for (node__ = (struct drm_gpuva_region
*)__drm_mm_interval_first(&(gpuva__)->region_mm, \
+ (start__), (end__)-1); \
+ node__->node.start < (end__); \
+ node__ = (struct drm_gpuva_region
*)list_next_entry(&node__->node, node_list))
+
+/**
+ * drm_gpuva_for_each_region - iternator to walk over a range of nodes
+ * @entry: &drm_gpuva_region structure to assign to in each
iteration step
+ * @gpuva: &drm_gpuva_manager structure to walk
+ *
+ * This iterator walks over all &drm_gpuva_region structures
associated with the
+ * &drm_gpuva_manager.
+ */
+#define drm_gpuva_for_each_region(entry, gpuva) \
+ list_for_each_entry(entry, drm_mm_nodes(&(gpuva)->region_mm),
node.node_list)
+
+/**
+ * drm_gpuva_for_each_region_safe - iternator to safely walk over
a range of
+ * nodes
+ * @entry: &drm_gpuva_region structure to assign to in each
iteration step
+ * @next: &next &drm_gpuva_region to store the next step
+ * @gpuva: &drm_gpuva_manager structure to walk
+ *
+ * This iterator walks over all &drm_gpuva_region structures
associated with the
+ * &drm_gpuva_manager. It is implemented with
list_for_each_safe(), so save
+ * against removal of elements.
+ */
+#define drm_gpuva_for_each_region_safe(entry, next, gpuva) \
+ list_for_each_entry_safe(entry, next,
drm_mm_nodes(&(gpuva)->region_mm), node.node_list)
+
+
+/**
+ * enum drm_gpuva_flags - flags for struct drm_gpuva
+ */
+enum drm_gpuva_flags {
+ /**
+ * @DRM_GPUVA_SWAPPED: flag indicating that the &drm_gpuva is
swapped
+ */
+ DRM_GPUVA_SWAPPED = (1 << 0),
+};
+
+/**
+ * struct drm_gpuva - structure to track a GPU VA mapping
+ *
+ * This structure represents a GPU VA mapping and is associated with a
+ * &drm_gpuva_manager. Internally it is based on a &drm_mm_node.
+ *
+ * Typically, this structure is embedded in bigger driver structures.
+ */
+struct drm_gpuva {
+ /**
+ * @node: the &drm_mm_node to track the GPU VA mapping
+ */
+ struct drm_mm_node node;
+
+ /**
+ * @mgr: the &drm_gpuva_manager this object is associated with
+ */
+ struct drm_gpuva_manager *mgr;
+
+ /**
+ * @region: the &drm_gpuva_region the &drm_gpuva is mapped in
+ */
+ struct drm_gpuva_region *region;
+
+ /**
+ * @head: the &list_head to attach this object to a &drm_gem_object
+ */
+ struct list_head head;
+
+ /**
+ * @flags: the &drm_gpuva_flags for this mapping
+ */
+ enum drm_gpuva_flags flags;
+
+ /**
+ * @gem: structure containing the &drm_gem_object and it's offset
+ */
+ struct {
+ /**
+ * @offset: the offset within the &drm_gem_object
+ */
+ u64 offset;
+
+ /**
+ * @obj: the mapped &drm_gem_object
+ */
+ struct drm_gem_object *obj;
+ } gem;
+};
+
+void drm_gpuva_link_locked(struct drm_gpuva *va);
+void drm_gpuva_link_unlocked(struct drm_gpuva *va);
+void drm_gpuva_unlink_locked(struct drm_gpuva *va);
+void drm_gpuva_unlink_unlocked(struct drm_gpuva *va);
+
+void drm_gpuva_destroy_locked(struct drm_gpuva *va);
+void drm_gpuva_destroy_unlocked(struct drm_gpuva *va);
+
+struct drm_gpuva *drm_gpuva_find(struct drm_gpuva_manager *mgr,
+ u64 addr, u64 range);
+struct drm_gpuva *drm_gpuva_find_prev(struct drm_gpuva_manager
*mgr, u64 start);
+struct drm_gpuva *drm_gpuva_find_next(struct drm_gpuva_manager
*mgr, u64 end);
+
+/**
+ * drm_gpuva_swap - sets whether the backing BO of this
&drm_gpuva is swapped
+ * @va: the &drm_gpuva to set the swap flag of
+ * @swap: indicates whether the &drm_gpuva is swapped
+ */
+static inline void drm_gpuva_swap(struct drm_gpuva *va, bool swap)
+{
+ if (swap)
+ va->flags |= DRM_GPUVA_SWAPPED;
+ else
+ va->flags &= ~DRM_GPUVA_SWAPPED;
+}
+
+/**
+ * drm_gpuva_swapped - indicates whether the backing BO of this
&drm_gpuva
+ * is swapped
+ * @va: the &drm_gpuva to check
+ */
+static inline bool drm_gpuva_swapped(struct drm_gpuva *va)
+{
+ return va->flags & DRM_GPUVA_SWAPPED;
+}
+
+/**
+ * drm_gpuva_for_each_va_in_range - iternator to walk over a
range of nodes
+ * @node__: &drm_gpuva structure to assign to in each iteration step
+ * @gpuva__: &drm_gpuva_manager structure to walk
+ * @start__: starting offset, the first node will overlap this
+ * @end__: ending offset, the last node will start before this
(but may overlap)
+ *
+ * This iterator walks over all nodes in the range allocator that lie
+ * between @start and @end. It is implemented similarly to
list_for_each(),
+ * but is using &drm_mm's internal interval tree to accelerate
the search for
+ * the starting node, and hence isn't safe against removal of
elements. It
+ * assumes that @end is within (or is the upper limit of) the
&drm_gpuva_manager.
+ * If [@start, @end] are beyond the range of the &drm_gpuva_manager, the
+ * iterator may walk over the special _unallocated_
&drm_mm.head_node of the
+ * backing &drm_mm, and may even continue indefinitely.
+ */
+#define drm_gpuva_for_each_va_in_range(node__, gpuva__, start__,
end__) \
+ for (node__ = (struct drm_gpuva
*)__drm_mm_interval_first(&(gpuva__)->va_mm, \
+ (start__), (end__)-1); \
+ node__->node.start < (end__); \
+ node__ = (struct drm_gpuva
*)list_next_entry(&node__->node, node_list))
+
+/**
+ * drm_gpuva_for_each_va - iternator to walk over a range of nodes
+ * @entry: &drm_gpuva structure to assign to in each iteration step
+ * @gpuva: &drm_gpuva_manager structure to walk
+ *
+ * This iterator walks over all &drm_gpuva structures associated
with the
+ * &drm_gpuva_manager.
+ */
+#define drm_gpuva_for_each_va(entry, gpuva) \
+ list_for_each_entry(entry, drm_mm_nodes(&(gpuva)->va_mm),
node.node_list)
+
+/**
+ * drm_gpuva_for_each_va_safe - iternator to safely walk over a range of
+ * nodes
+ * @entry: &drm_gpuva structure to assign to in each iteration step
+ * @next: &next &drm_gpuva to store the next step
+ * @gpuva: &drm_gpuva_manager structure to walk
+ *
+ * This iterator walks over all &drm_gpuva structures associated
with the
+ * &drm_gpuva_manager. It is implemented with
list_for_each_safe(), so save
+ * against removal of elements.
+ */
+#define drm_gpuva_for_each_va_safe(entry, next, gpuva) \
+ list_for_each_entry_safe(entry, next,
drm_mm_nodes(&(gpuva)->va_mm), node.node_list)
+
+/**
+ * enum drm_gpuva_op_type - GPU VA operation type
+ *
+ * Operations to alter the GPU VA mappings tracked by the
&drm_gpuva_manager
+ * can be map, remap or unmap operations.
+ */
+enum drm_gpuva_op_type {
+ /**
+ * @DRM_GPUVA_OP_MAP: the map op type
+ */
+ DRM_GPUVA_OP_MAP,
+
+ /**
+ * @DRM_GPUVA_OP_REMAP: the remap op type
+ */
+ DRM_GPUVA_OP_REMAP,
+
+ /**
+ * @DRM_GPUVA_OP_UNMAP: the unmap op type
+ */
+ DRM_GPUVA_OP_UNMAP,
+};
+
+/**
+ * struct drm_gpuva_op_map - GPU VA map operation
+ *
+ * This structure represents a single map operation generated by the
+ * DRM GPU VA manager.
+ */
+struct drm_gpuva_op_map {
+ /**
+ * @va: structure containing address and range of a map
+ * operation
+ */
+ struct {
+ /**
+ * @addr: the base address of the new mapping
+ */
+ u64 addr;
+
+ /**
+ * @range: the range of the new mapping
+ */
+ u64 range;
+ } va;
+
+ /**
+ * @gem: structure containing the &drm_gem_object and it's offset
+ */
+ struct {
+ /**
+ * @offset: the offset within the &drm_gem_object
+ */
+ u64 offset;
+
+ /**
+ * @obj: the &drm_gem_object to map
+ */
+ struct drm_gem_object *obj;
+ } gem;
+};
+
+/**
+ * struct drm_gpuva_op_unmap - GPU VA unmap operation
+ *
+ * This structure represents a single unmap operation generated by the
+ * DRM GPU VA manager.
+ */
+struct drm_gpuva_op_unmap {
+ /**
+ * @va: the &drm_gpuva to unmap
+ */
+ struct drm_gpuva *va;
+
+ /**
+ * @keep:
+ *
+ * Indicates whether this &drm_gpuva is physically contiguous
with the
+ * original mapping request.
+ *
+ * Optionally, if &keep is set, drivers may keep the actual
page table
+ * mappings for this &drm_gpuva, adding the missing page
table entries
+ * only and update the &drm_gpuva_manager accordingly.
+ */
+ bool keep;
+};
+
+/**
+ * struct drm_gpuva_op_remap - GPU VA remap operation
+ *
+ * This represents a single remap operation generated by the DRM
GPU VA manager.
+ *
+ * A remap operation is generated when an existing GPU VA
mmapping is split up
+ * by inserting a new GPU VA mapping or by partially unmapping existent
+ * mapping(s), hence it consists of a maximum of two map and one unmap
+ * operation.
+ *
+ * The @unmap operation takes care of removing the original
existing mapping.
+ * @prev is used to remap the preceding part, @next the subsequent part.
+ *
+ * If either a new mapping's start address is aligned with the
start address
+ * of the old mapping or the new mapping's end address is aligned
with the
+ * end address of the old mapping, either @prev or @next is NULL.
+ *
+ * Note, the reason for a dedicated remap operation, rather than
arbitrary
+ * unmap and map operations, is to give drivers the chance of
extracting driver
+ * specific data for creating the new mappings from the unmap
operations's
+ * &drm_gpuva structure which typically is embedded in larger
driver specific
+ * structures.
+ */
+struct drm_gpuva_op_remap {
+ /**
+ * @prev: the preceding part of a split mapping
+ */
+ struct drm_gpuva_op_map *prev;
+
+ /**
+ * @next: the subsequent part of a split mapping
+ */
+ struct drm_gpuva_op_map *next;
+
+ /**
+ * @unmap: the unmap operation for the original existing mapping
+ */
+ struct drm_gpuva_op_unmap *unmap;
+};
+
+/**
+ * struct drm_gpuva_op - GPU VA operation
+ *
+ * This structure represents a single generic operation, which
can be either
+ * map, unmap or remap.
+ *
+ * The particular type of the operation is defined by @op.
+ */
+struct drm_gpuva_op {
+ /**
+ * @entry:
+ *
+ * The &list_head used to distribute instances of this struct within
+ * &drm_gpuva_ops.
+ */
+ struct list_head entry;
+
+ /**
+ * @op: the type of the operation
+ */
+ enum drm_gpuva_op_type op;
+
+ union {
+ /**
+ * @map: the map operation
+ */
+ struct drm_gpuva_op_map map;
+
+ /**
+ * @unmap: the unmap operation
+ */
+ struct drm_gpuva_op_unmap unmap;
+
+ /**
+ * @remap: the remap operation
+ */
+ struct drm_gpuva_op_remap remap;
+ };
+};
+
+/**
+ * struct drm_gpuva_ops - wraps a list of &drm_gpuva_op
+ */
+struct drm_gpuva_ops {
+ /**
+ * @list: the &list_head
+ */
+ struct list_head list;
+};
+
+/**
+ * drm_gpuva_for_each_op - iterator to walk over all ops
+ * @op: &drm_gpuva_op to assign in each iteration step
+ * @ops: &drm_gpuva_ops to walk
+ *
+ * This iterator walks over all ops within a given list of operations.
+ */
+#define drm_gpuva_for_each_op(op, ops) list_for_each_entry(op,
&(ops)->list, entry)
+
+/**
+ * drm_gpuva_for_each_op_safe - iterator to safely walk over all ops
+ * @op: &drm_gpuva_op to assign in each iteration step
+ * @next: &next &drm_gpuva_op to store the next step
+ * @ops: &drm_gpuva_ops to walk
+ *
+ * This iterator walks over all ops within a given list of
operations. It is
+ * implemented with list_for_each_safe(), so save against removal
of elements.
+ */
+#define drm_gpuva_for_each_op_safe(op, next, ops) \
+ list_for_each_entry_safe(op, next, &(ops)->list, entry)
+
+struct drm_gpuva_ops *
+drm_gpuva_sm_map_ops_create(struct drm_gpuva_manager *mgr,
+ u64 addr, u64 range,
+ struct drm_gem_object *obj, u64 offset);
+struct drm_gpuva_ops *
+drm_gpuva_sm_unmap_ops_create(struct drm_gpuva_manager *mgr,
+ u64 addr, u64 range);
+void drm_gpuva_ops_free(struct drm_gpuva_ops *ops);
+
+#endif /* __DRM_GPUVA_MGR_H__ */
--
2.39.0
