Add an abstraction layer between the drm_gpuva mappings of a
particular
drm_gem_object and this GEM object itself. The abstraction
represents
a
combination of a drm_gem_object and drm_gpuvm. The drm_gem_object
holds
a list of drm_gpuvm_bo structures (the structure representing
this
abstraction), while each drm_gpuvm_bo contains list of mappings
of
this
GEM object.
This has multiple advantages:
1) We can use the drm_gpuvm_bo structure to attach it to various
lists
of the drm_gpuvm. This is useful for tracking external and
evicted
objects per VM, which is introduced in subsequent patches.
2) Finding mappings of a certain drm_gem_object mapped in a
certain
drm_gpuvm becomes much cheaper.
3) Drivers can derive and extend the structure to easily
represent
driver specific states of a BO for a certain GPUVM.
The idea of this abstraction was taken from amdgpu, hence the
credit
for
this idea goes to the developers of amdgpu.
Cc: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
---
drivers/gpu/drm/drm_gpuvm.c | 335
+++++++++++++++++++++--
--
drivers/gpu/drm/nouveau/nouveau_uvmm.c | 64 +++--
include/drm/drm_gem.h | 32 +--
include/drm/drm_gpuvm.h | 188 +++++++++++++-
4 files changed, 533 insertions(+), 86 deletions(-)
diff --git a/drivers/gpu/drm/drm_gpuvm.c
b/drivers/gpu/drm/drm_gpuvm.c
index c03332883432..7f4f5919f84c 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -70,6 +70,18 @@
* &drm_gem_object, such as the &drm_gem_object containing the
root
page table,
* but it can also be a 'dummy' object, which can be allocated
with
* drm_gpuvm_resv_object_alloc().
+ *
+ * In order to connect a struct drm_gpuva its backing
&drm_gem_object each
+ * &drm_gem_object maintains a list of &drm_gpuvm_bo structures,
and
each
+ * &drm_gpuvm_bo contains a list of &drm_gpuva structures.
+ *
+ * A &drm_gpuvm_bo is an abstraction that represents a
combination
of a
+ * &drm_gpuvm and a &drm_gem_object. Every such combination
should
be unique.
+ * This is ensured by the API through drm_gpuvm_bo_obtain() and
+ * drm_gpuvm_bo_obtain_prealloc() which first look into the
corresponding
+ * &drm_gem_object list of &drm_gpuvm_bos for an existing
instance
of this
+ * particular combination. If not existent a new instance is
created
and linked
+ * to the &drm_gem_object.
*/
/**
@@ -395,21 +407,28 @@
/**
* 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, removing and
iterating
- * &drm_gpuva objects as well as generating all kinds of
operations,
such as
- * split / merge or prefetch.
- *
- * The GPU VA manager also does not take care of the locking of
the
backing
- * &drm_gem_object buffers GPU VA lists by itself; drivers are
responsible to
- * enforce mutual exclusion using either the GEMs dma_resv lock
or
alternatively
- * a driver specific external lock. For the latter see also
- * drm_gem_gpuva_set_lock().
- *
- * However, the GPU VA manager contains lockdep checks to ensure
callers of its
- * API hold the corresponding lock whenever the &drm_gem_objects
GPU
VA list is
- * accessed by functions such as drm_gpuva_link() or
drm_gpuva_unlink().
+ * In terms of managing &drm_gpuva entries DRM GPUVM 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, removing
+ * and iterating &drm_gpuva objects as well as generating all
kinds
of
+ * operations, such as split / merge or prefetch.
+ *
+ * DRM GPUVM also does not take care of the locking of the
backing
+ * &drm_gem_object buffers GPU VA lists and &drm_gpuvm_bo
abstractions by
+ * itself; drivers are responsible to enforce mutual exclusion
using
either the
+ * GEMs dma_resv lock or alternatively a driver specific
external
lock. For the
+ * latter see also drm_gem_gpuva_set_lock().
+ *
+ * However, DRM GPUVM contains lockdep checks to ensure callers
of
its API hold
+ * the corresponding lock whenever the &drm_gem_objects GPU VA
list
is accessed
+ * by functions such as drm_gpuva_link() or drm_gpuva_unlink(),
but
also
+ * drm_gpuvm_bo_obtain() and drm_gpuvm_bo_put().
+ *
+ * The latter is required since on creation and destruction of a
&drm_gpuvm_bo
+ * the &drm_gpuvm_bo is attached / removed from the
&drm_gem_objects
gpuva list.
+ * Subsequent calls to drm_gpuvm_bo_obtain() for the same
&drm_gpuvm
and
+ * &drm_gem_object must be able to observe previous creations
and
destructions
+ * of &drm_gpuvm_bos in order to keep instances unique.
*/
/**
@@ -439,6 +458,7 @@
* {
* struct drm_gpuva_ops *ops;
* struct drm_gpuva_op *op
+ * struct drm_gpuvm_bo *vm_bo;
*
* driver_lock_va_space();
* ops = drm_gpuvm_sm_map_ops_create(gpuvm, addr,
range,
@@ -446,6 +466,10 @@
* if (IS_ERR(ops))
* return PTR_ERR(ops);
*
+ * vm_bo = drm_gpuvm_bo_obtain(gpuvm, obj);
+ * if (IS_ERR(vm_bo))
+ * return PTR_ERR(vm_bo);
+ *
* drm_gpuva_for_each_op(op, ops) {
* struct drm_gpuva *va;
*
@@ -458,7 +482,7 @@
*
* driver_vm_map();
* drm_gpuva_map(gpuvm, va, &op-
map);
- * drm_gpuva_link(va);
+ * drm_gpuva_link(va, vm_bo);
*
* break;
* case DRM_GPUVA_OP_REMAP: {
@@ -485,11 +509,11 @@
* driver_vm_remap();
* drm_gpuva_remap(prev, next, &op-
remap);
*
- * drm_gpuva_unlink(va);
* if (prev)
- * drm_gpuva_link(prev);
+ * drm_gpuva_link(prev, va-
vm_bo);
* if (next)
- * drm_gpuva_link(next);
+ * drm_gpuva_link(next, va-
vm_bo);
+ * drm_gpuva_unlink(va);
*
* break;
* }
@@ -505,6 +529,7 @@
* break;
* }
* }
+ * drm_gpuvm_bo_put(vm_bo);
* driver_unlock_va_space();
*
* return 0;
@@ -514,6 +539,7 @@
*
* struct driver_context {
* struct drm_gpuvm *gpuvm;
+ * struct drm_gpuvm_bo *vm_bo;
* struct drm_gpuva *new_va;
* struct drm_gpuva *prev_va;
* struct drm_gpuva *next_va;
@@ -534,6 +560,7 @@
* struct drm_gem_object *obj,
u64
offset)
* {
* struct driver_context ctx;
+ * struct drm_gpuvm_bo *vm_bo;
* struct drm_gpuva_ops *ops;
* struct drm_gpuva_op *op;
* int ret = 0;
@@ -543,16 +570,23 @@
* ctx.new_va = kzalloc(sizeof(*ctx.new_va),
GFP_KERNEL);
* ctx.prev_va = kzalloc(sizeof(*ctx.prev_va),
GFP_KERNEL);
* ctx.next_va = kzalloc(sizeof(*ctx.next_va),
GFP_KERNEL);
- * if (!ctx.new_va || !ctx.prev_va || !ctx.next_va)
{
+ * ctx.vm_bo = drm_gpuvm_bo_create(gpuvm, obj);
+ * if (!ctx.new_va || !ctx.prev_va || !ctx.next_va
||
!vm_bo) {
* ret = -ENOMEM;
* goto out;
* }
*
+ * // Typically protected with a driver specific GEM
gpuva lock
+ * // used in the fence signaling path for
drm_gpuva_link() and
+ * // drm_gpuva_unlink(), hence pre-allocate.
+ * ctx.vm_bo =
drm_gpuvm_bo_obtain_prealloc(ctx.vm_bo);
+ *
* driver_lock_va_space();
* ret = drm_gpuvm_sm_map(gpuvm, &ctx, addr, range,
obj,
offset);
* driver_unlock_va_space();
*
* out:
+ * drm_gpuvm_bo_put(ctx.vm_bo);
* kfree(ctx.new_va);
* kfree(ctx.prev_va);
* kfree(ctx.next_va);
@@ -565,7 +599,7 @@
*
* drm_gpuva_map(ctx->vm, ctx->new_va, &op->map);
*
- * drm_gpuva_link(ctx->new_va);
+ * drm_gpuva_link(ctx->new_va, ctx->vm_bo);
*
* // prevent the new GPUVA from being freed in
* // driver_mapping_create()
@@ -577,22 +611,23 @@
* int driver_gpuva_remap(struct drm_gpuva_op *op, void
*__ctx)
* {
* struct driver_context *ctx = __ctx;
+ * struct drm_gpuva *va = op->remap.unmap->va;
*
* drm_gpuva_remap(ctx->prev_va, ctx->next_va, &op-
remap);
*
- * drm_gpuva_unlink(op->remap.unmap->va);
- * kfree(op->remap.unmap->va);
- *
* if (op->remap.prev) {
- * drm_gpuva_link(ctx->prev_va);
+ * drm_gpuva_link(ctx->prev_va, va->vm_bo);
* ctx->prev_va = NULL;
* }
*
* if (op->remap.next) {
- * drm_gpuva_link(ctx->next_va);
+ * drm_gpuva_link(ctx->next_va, va->vm_bo);
* ctx->next_va = NULL;
* }
*
+ * drm_gpuva_unlink(va);
+ * kfree(va);
+ *
* return 0;
* }
*
@@ -774,6 +809,194 @@ drm_gpuvm_destroy(struct drm_gpuvm *gpuvm)
}
EXPORT_SYMBOL_GPL(drm_gpuvm_destroy);
+/**
+ * drm_gpuvm_bo_create() - create a new instance of struct
drm_gpuvm_bo
+ * @gpuvm: The &drm_gpuvm the @obj is mapped in.
+ * @obj: The &drm_gem_object being mapped in the @gpuvm.
+ *
+ * If provided by the driver, this function uses the
&drm_gpuvm_ops
+ * vm_bo_alloc() callback to allocate.
+ *
+ * Returns: a pointer to the &drm_gpuvm_bo on success, NULL on
failure
+ */
+struct drm_gpuvm_bo *
+drm_gpuvm_bo_create(struct drm_gpuvm *gpuvm,
+ struct drm_gem_object *obj)
+{
+ const struct drm_gpuvm_ops *ops = gpuvm->ops;
+ struct drm_gpuvm_bo *vm_bo;
+
+ if (ops && ops->vm_bo_alloc)
+ vm_bo = ops->vm_bo_alloc();
+ else
+ vm_bo = kzalloc(sizeof(*vm_bo), GFP_KERNEL);
+
+ if (unlikely(!vm_bo))
+ return NULL;
+
+ vm_bo->vm = gpuvm;
+ vm_bo->obj = obj;
+ drm_gem_object_get(obj);
+
+ kref_init(&vm_bo->kref);
+ INIT_LIST_HEAD(&vm_bo->list.gpuva);
+ INIT_LIST_HEAD(&vm_bo->list.entry.gem);
+
+ return vm_bo;
+}
+EXPORT_SYMBOL_GPL(drm_gpuvm_bo_create);
+
+static void
+drm_gpuvm_bo_destroy(struct kref *kref)
+{
+ struct drm_gpuvm_bo *vm_bo = container_of(kref, struct
drm_gpuvm_bo,
+ kref);
+ struct drm_gpuvm *gpuvm = vm_bo->vm;
+ const struct drm_gpuvm_ops *ops = gpuvm->ops;
+ struct drm_gem_object *obj = vm_bo->obj;
+ bool lock = !drm_gpuvm_resv_protected(gpuvm);
+
+ if (!lock)
+ drm_gpuvm_resv_assert_held(gpuvm);
+
+ drm_gem_gpuva_assert_lock_held(obj);
+ list_del(&vm_bo->list.entry.gem);
+
+ if (ops && ops->vm_bo_free)
+ ops->vm_bo_free(vm_bo);
+ else
+ kfree(vm_bo);
+
+ drm_gem_object_put(obj);
+}
+
+/**
+ * drm_gpuvm_bo_put() - drop a struct drm_gpuvm_bo reference
+ * @vm_bo: the &drm_gpuvm_bo to release the reference of
+ *
+ * This releases a reference to @vm_bo.
+ *
+ * If the reference count drops to zero, the &gpuvm_bo is
destroyed,
which
+ * includes removing it from the GEMs gpuva list. Hence, if a
call
to this
+ * function can potentially let the reference count to zero the
caller must
+ * hold the dma-resv or driver specific GEM gpuva lock.
+ */
+void
+drm_gpuvm_bo_put(struct drm_gpuvm_bo *vm_bo)
+{
+ if (vm_bo)
+ kref_put(&vm_bo->kref, drm_gpuvm_bo_destroy);
+}
+EXPORT_SYMBOL_GPL(drm_gpuvm_bo_put);
+
+static struct drm_gpuvm_bo *
+__drm_gpuvm_bo_find(struct drm_gpuvm *gpuvm,
+ struct drm_gem_object *obj)
+{
+ struct drm_gpuvm_bo *vm_bo;
+
+ drm_gem_gpuva_assert_lock_held(obj);
+ drm_gem_for_each_gpuvm_bo(vm_bo, obj)
+ if (vm_bo->vm == gpuvm)
+ return vm_bo;
+
+ return NULL;
+}
+
+/**
+ * drm_gpuvm_bo_find() - find the &drm_gpuvm_bo for the given
+ * &drm_gpuvm and &drm_gem_object
+ * @gpuvm: The &drm_gpuvm the @obj is mapped in.
+ * @obj: The &drm_gem_object being mapped in the @gpuvm.
+ *
+ * Find the &drm_gpuvm_bo representing the combination of the
given
+ * &drm_gpuvm and &drm_gem_object. If found, increases the
reference
+ * count of the &drm_gpuvm_bo accordingly.
+ *
+ * Returns: a pointer to the &drm_gpuvm_bo on success, NULL on
failure
+ */
+struct drm_gpuvm_bo *
+drm_gpuvm_bo_find(struct drm_gpuvm *gpuvm,
+ struct drm_gem_object *obj)
+{
+ struct drm_gpuvm_bo *vm_bo = __drm_gpuvm_bo_find(gpuvm,
obj);
+
+ return vm_bo ? drm_gpuvm_bo_get(vm_bo) : NULL;
+}
+EXPORT_SYMBOL_GPL(drm_gpuvm_bo_find);
+
+/**
+ * drm_gpuvm_bo_obtain() - obtains and instance of the
&drm_gpuvm_bo
for the
+ * given &drm_gpuvm and &drm_gem_object
+ * @gpuvm: The &drm_gpuvm the @obj is mapped in.
+ * @obj: The &drm_gem_object being mapped in the @gpuvm.
+ *
+ * Find the &drm_gpuvm_bo representing the combination of the
given
+ * &drm_gpuvm and &drm_gem_object. If found, increases the
reference
+ * count of the &drm_gpuvm_bo accordingly. If not found,
allocates a
new
+ * &drm_gpuvm_bo.
+ *
+ * A new &drm_gpuvm_bo is added to the GEMs gpuva list.
+ *
+ * Returns: a pointer to the &drm_gpuvm_bo on success, an
ERR_PTR on
failure
+ */
+struct drm_gpuvm_bo *
+drm_gpuvm_bo_obtain(struct drm_gpuvm *gpuvm,
+ struct drm_gem_object *obj)
+{
+ struct drm_gpuvm_bo *vm_bo;
+
+ vm_bo = drm_gpuvm_bo_find(gpuvm, obj);
+ if (vm_bo)
+ return vm_bo;
+
+ vm_bo = drm_gpuvm_bo_create(gpuvm, obj);
+ if (!vm_bo)
+ return ERR_PTR(-ENOMEM);
+
+ drm_gem_gpuva_assert_lock_held(obj);
+ list_add_tail(&vm_bo->list.entry.gem, &obj->gpuva.list);
+
+ return vm_bo;
+}
+EXPORT_SYMBOL_GPL(drm_gpuvm_bo_obtain);
+
+/**
+ * drm_gpuvm_bo_obtain_prealloc() - obtains and instance of the
&drm_gpuvm_bo
+ * for the given &drm_gpuvm and &drm_gem_object
+ * @__vm_bo: A pre-allocated struct drm_gpuvm_bo.
+ *
+ * Find the &drm_gpuvm_bo representing the combination of the
given
+ * &drm_gpuvm and &drm_gem_object. If found, increases the
reference
+ * count of the found &drm_gpuvm_bo accordingly, while the
@__vm_bo
reference
+ * count is decreased. If not found @__vm_bo is returned without
further
+ * increase of the reference count.
+ *
+ * A new &drm_gpuvm_bo is added to the GEMs gpuva list.
+ *
+ * Returns: a pointer to the found &drm_gpuvm_bo or @__vm_bo if
no
existing
+ * &drm_gpuvm_bo was found
+ */
+struct drm_gpuvm_bo *
+drm_gpuvm_bo_obtain_prealloc(struct drm_gpuvm_bo *__vm_bo)
+{
+ struct drm_gpuvm *gpuvm = __vm_bo->vm;
+ struct drm_gem_object *obj = __vm_bo->obj;
+ struct drm_gpuvm_bo *vm_bo;
+
+ vm_bo = drm_gpuvm_bo_find(gpuvm, obj);
+ if (vm_bo) {
+ drm_gpuvm_bo_put(__vm_bo);
+ return vm_bo;
+ }
+
+ drm_gem_gpuva_assert_lock_held(obj);
+ list_add_tail(&__vm_bo->list.entry.gem, &obj-
gpuva.list);
+
+ return __vm_bo;
+}
+EXPORT_SYMBOL_GPL(drm_gpuvm_bo_obtain_prealloc);
+
static int
__drm_gpuva_insert(struct drm_gpuvm *gpuvm,
struct drm_gpuva *va)
@@ -864,24 +1087,33 @@ EXPORT_SYMBOL_GPL(drm_gpuva_remove);
/**
* drm_gpuva_link() - link a &drm_gpuva
* @va: the &drm_gpuva to link
+ * @vm_bo: the &drm_gpuvm_bo to add the &drm_gpuva to
*
- * This adds the given &va to the GPU VA list of the
&drm_gem_object
it is
- * associated with.
+ * This adds the given &va to the GPU VA list of the
&drm_gpuvm_bo
and the
+ * &drm_gpuvm_bo to the &drm_gem_object it is associated with.
+ *
+ * For every &drm_gpuva entry added to the &drm_gpuvm_bo an
additional
+ * reference of the latter is taken.
*
* This function expects the caller to protect the GEM's GPUVA
list
against
- * concurrent access using the GEMs dma_resv lock.
+ * concurrent access using either the GEMs dma_resv lock or a
driver
specific
+ * lock set through drm_gem_gpuva_set_lock().
*/
void
-drm_gpuva_link(struct drm_gpuva *va)
+drm_gpuva_link(struct drm_gpuva *va, struct drm_gpuvm_bo *vm_bo)
{
struct drm_gem_object *obj = va->gem.obj;
+ struct drm_gpuvm *gpuvm = va->vm;
if (unlikely(!obj))
return;
- drm_gem_gpuva_assert_lock_held(obj);
+ drm_WARN_ON(gpuvm->drm, obj != vm_bo->obj);
- list_add_tail(&va->gem.entry, &obj->gpuva.list);
+ va->vm_bo = drm_gpuvm_bo_get(vm_bo);
+
+ drm_gem_gpuva_assert_lock_held(obj);
+ list_add_tail(&va->gem.entry, &vm_bo->list.gpuva);
}
EXPORT_SYMBOL_GPL(drm_gpuva_link);
@@ -892,20 +1124,31 @@ EXPORT_SYMBOL_GPL(drm_gpuva_link);
* This removes the given &va from the GPU VA list of the
&drm_gem_object it is
* associated with.
*
+ * This removes the given &va from the GPU VA list of the
&drm_gpuvm_bo and
+ * the &drm_gpuvm_bo from the &drm_gem_object it is associated
with
in case
+ * this call unlinks the last &drm_gpuva from the &drm_gpuvm_bo.
+ *
+ * For every &drm_gpuva entry removed from the &drm_gpuvm_bo a
reference of
+ * the latter is dropped.
+ *
* This function expects the caller to protect the GEM's GPUVA
list
against
- * concurrent access using the GEMs dma_resv lock.
+ * concurrent access using either the GEMs dma_resv lock or a
driver
specific
+ * lock set through drm_gem_gpuva_set_lock().
*/
void
drm_gpuva_unlink(struct drm_gpuva *va)
{
struct drm_gem_object *obj = va->gem.obj;
+ struct drm_gpuvm_bo *vm_bo = va->vm_bo;
if (unlikely(!obj))
return;
drm_gem_gpuva_assert_lock_held(obj);
-
list_del_init(&va->gem.entry);
+
+ va->vm_bo = NULL;
+ drm_gpuvm_bo_put(vm_bo);
}
EXPORT_SYMBOL_GPL(drm_gpuva_unlink);
@@ -1050,10 +1293,10 @@ drm_gpuva_remap(struct drm_gpuva *prev,
struct drm_gpuva *next,
struct drm_gpuva_op_remap *op)
{
- struct drm_gpuva *curr = op->unmap->va;
- struct drm_gpuvm *gpuvm = curr->vm;
+ struct drm_gpuva *va = op->unmap->va;
+ struct drm_gpuvm *gpuvm = va->vm;
- drm_gpuva_remove(curr);
+ drm_gpuva_remove(va);
if (op->prev) {
drm_gpuva_init_from_op(prev, op->prev);
@@ -1695,9 +1938,8 @@ drm_gpuvm_prefetch_ops_create(struct
drm_gpuvm
*gpuvm,
EXPORT_SYMBOL_GPL(drm_gpuvm_prefetch_ops_create);
/**
- * drm_gpuvm_gem_unmap_ops_create() - creates the &drm_gpuva_ops
to
unmap a GEM
- * @gpuvm: the &drm_gpuvm representing the GPU VA space
- * @obj: the &drm_gem_object to unmap
+ * drm_gpuvm_bo_unmap_ops_create() - creates the &drm_gpuva_ops
to
unmap a GEM
+ * @vm_bo: the &drm_gpuvm_bo abstraction
*
* This function creates a list of operations to perform
unmapping
for every
* GPUVA attached to a GEM.
@@ -1714,15 +1956,14 @@
EXPORT_SYMBOL_GPL(drm_gpuvm_prefetch_ops_create);
* Returns: a pointer to the &drm_gpuva_ops on success, an
ERR_PTR
on failure
*/
struct drm_gpuva_ops *
-drm_gpuvm_gem_unmap_ops_create(struct drm_gpuvm *gpuvm,
- struct drm_gem_object *obj)
+drm_gpuvm_bo_unmap_ops_create(struct drm_gpuvm_bo *vm_bo)
{
struct drm_gpuva_ops *ops;
struct drm_gpuva_op *op;
struct drm_gpuva *va;
int ret;
- drm_gem_gpuva_assert_lock_held(obj);
+ drm_gem_gpuva_assert_lock_held(vm_bo->obj);
ops = kzalloc(sizeof(*ops), GFP_KERNEL);
if (!ops)
@@ -1730,8 +1971,8 @@ drm_gpuvm_gem_unmap_ops_create(struct
drm_gpuvm
*gpuvm,
INIT_LIST_HEAD(&ops->list);
- drm_gem_for_each_gpuva(va, obj) {
- op = gpuva_op_alloc(gpuvm);
+ drm_gpuvm_bo_for_each_va(va, vm_bo) {
+ op = gpuva_op_alloc(vm_bo->vm);
if (!op) {
ret = -ENOMEM;
goto err_free_ops;
@@ -1745,10 +1986,10 @@ drm_gpuvm_gem_unmap_ops_create(struct
drm_gpuvm *gpuvm,
return ops;
err_free_ops:
- drm_gpuva_ops_free(gpuvm, ops);
+ drm_gpuva_ops_free(vm_bo->vm, ops);
return ERR_PTR(ret);
}
-EXPORT_SYMBOL_GPL(drm_gpuvm_gem_unmap_ops_create);
+EXPORT_SYMBOL_GPL(drm_gpuvm_bo_unmap_ops_create);
/**
* drm_gpuva_ops_free() - free the given &drm_gpuva_ops
diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
index ed439bf4032f..1e95b0a1b047 100644
--- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
@@ -62,6 +62,8 @@ struct bind_job_op {
enum vm_bind_op op;
u32 flags;
+ struct drm_gpuvm_bo *vm_bo;
+
struct {
u64 addr;
u64 range;
@@ -1113,22 +1115,28 @@ bind_validate_region(struct nouveau_job
*job)
}
static void
-bind_link_gpuvas(struct drm_gpuva_ops *ops, struct
nouveau_uvma_prealloc *new)
+bind_link_gpuvas(struct bind_job_op *bop)
{
+ struct nouveau_uvma_prealloc *new = &bop->new;
+ struct drm_gpuvm_bo *vm_bo = bop->vm_bo;
+ struct drm_gpuva_ops *ops = bop->ops;
struct drm_gpuva_op *op;
drm_gpuva_for_each_op(op, ops) {
switch (op->op) {
case DRM_GPUVA_OP_MAP:
- drm_gpuva_link(&new->map->va);
+ drm_gpuva_link(&new->map->va, vm_bo);
break;
- case DRM_GPUVA_OP_REMAP:
+ case DRM_GPUVA_OP_REMAP: {
+ struct drm_gpuva *va = op->remap.unmap-
va;
+
if (op->remap.prev)
- drm_gpuva_link(&new->prev->va);
+ drm_gpuva_link(&new->prev->va,
va-
vm_bo);
if (op->remap.next)
- drm_gpuva_link(&new->next->va);
- drm_gpuva_unlink(op->remap.unmap->va);
+ drm_gpuva_link(&new->next->va,
va-
vm_bo);
+ drm_gpuva_unlink(va);
break;
+ }
case DRM_GPUVA_OP_UNMAP:
drm_gpuva_unlink(op->unmap.va);
break;
@@ -1150,10 +1158,18 @@ nouveau_uvmm_bind_job_submit(struct
nouveau_job *job)
list_for_each_op(op, &bind_job->ops) {
if (op->op == OP_MAP) {
- op->gem.obj = drm_gem_object_lookup(job-
file_priv,
- op-
gem.handle);
- if (!op->gem.obj)
+ struct drm_gem_object *obj;
+
+ obj = drm_gem_object_lookup(job-
file_priv,
+ op-
gem.handle);
+ if (!(op->gem.obj = obj))
return -ENOENT;
+
+ dma_resv_lock(obj->resv, NULL);
+ op->vm_bo = drm_gpuvm_bo_obtain(&uvmm-
base,
obj);
+ dma_resv_unlock(obj->resv);
+ if (IS_ERR(op->vm_bo))
+ return PTR_ERR(op->vm_bo);
}
ret = bind_validate_op(job, op);
@@ -1364,7 +1380,7 @@ nouveau_uvmm_bind_job_submit(struct
nouveau_job
*job)
case OP_UNMAP_SPARSE:
case OP_MAP:
case OP_UNMAP:
- bind_link_gpuvas(op->ops, &op->new);
+ bind_link_gpuvas(op);
break;
default:
break;
@@ -1511,6 +1527,12 @@ nouveau_uvmm_bind_job_free_work_fn(struct
work_struct *work)
if (!IS_ERR_OR_NULL(op->ops))
drm_gpuva_ops_free(&uvmm->base, op-
ops);
+ if (!IS_ERR_OR_NULL(op->vm_bo)) {
+ dma_resv_lock(obj->resv, NULL);
+ drm_gpuvm_bo_put(op->vm_bo);
+ dma_resv_unlock(obj->resv);
+ }
+
if (obj)
drm_gem_object_put(obj);
}
@@ -1776,15 +1798,18 @@ void
nouveau_uvmm_bo_map_all(struct nouveau_bo *nvbo, struct
nouveau_mem
*mem)
{
struct drm_gem_object *obj = &nvbo->bo.base;
+ struct drm_gpuvm_bo *vm_bo;
�� struct drm_gpuva *va;
dma_resv_assert_held(obj->resv);
- drm_gem_for_each_gpuva(va, obj) {
- struct nouveau_uvma *uvma = uvma_from_va(va);
+ drm_gem_for_each_gpuvm_bo(vm_bo, obj) {
+ drm_gpuvm_bo_for_each_va(va, vm_bo) {
+ struct nouveau_uvma *uvma =
uvma_from_va(va);
- nouveau_uvma_map(uvma, mem);
- drm_gpuva_invalidate(va, false);
+ nouveau_uvma_map(uvma, mem);
+ drm_gpuva_invalidate(va, false);
+ }
}
}
@@ -1792,15 +1817,18 @@ void
nouveau_uvmm_bo_unmap_all(struct nouveau_bo *nvbo)
{
struct drm_gem_object *obj = &nvbo->bo.base;
+ struct drm_gpuvm_bo *vm_bo;
struct drm_gpuva *va;
dma_resv_assert_held(obj->resv);
- drm_gem_for_each_gpuva(va, obj) {
- struct nouveau_uvma *uvma = uvma_from_va(va);
+ drm_gem_for_each_gpuvm_bo(vm_bo, obj) {
+ drm_gpuvm_bo_for_each_va(va, vm_bo) {
+ struct nouveau_uvma *uvma =
uvma_from_va(va);
- �� nouveau_uvma_unmap(uvma);
- drm_gpuva_invalidate(va, true);
+ nouveau_uvma_unmap(uvma);
+ drm_gpuva_invalidate(va, true);
+ }
}
}
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 16364487fde9..369505447acd 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -580,7 +580,7 @@ int drm_gem_evict(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.
+ * This initializes the &drm_gem_object's &drm_gpuvm_bo list.
*
* Calling this function is only necessary for drivers
intending to
support the
* &drm_driver_feature DRIVER_GEM_GPUVA.
@@ -593,28 +593,28 @@ static inline void
drm_gem_gpuva_init(struct
drm_gem_object *obj)
}
/**
- * 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
+ * drm_gem_for_each_gpuvm_bo() - iterator to walk over a list of
&drm_gpuvm_bo
+ * @entry__: &drm_gpuvm_bo structure to assign to in each
iteration
step
+ * @obj__: the &drm_gem_object the &drm_gpuvm_bo to walk are
associated with
*
- * This iterator walks over all &drm_gpuva structures associated
with the
- * &drm_gpuva_manager.
+ * This iterator walks over all &drm_gpuvm_bo structures
associated
with the
+ * &drm_gem_object.
*/
-#define drm_gem_for_each_gpuva(entry__, obj__) \
- list_for_each_entry(entry__, &(obj__)->gpuva.list,
gem.entry)
+#define drm_gem_for_each_gpuvm_bo(entry__, obj__) \
+ list_for_each_entry(entry__, &(obj__)->gpuva.list,
list.entry.gem)
/**
- * 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
+ * drm_gem_for_each_gpuvm_bo_safe() - iterator to safely walk
over a
list of
+ * &drm_gpuvm_bo
+ * @entry__: &drm_gpuvm_bostructure to assign to in each
iteration
step
+ * @next__: &next &drm_gpuvm_bo to store the next step
+ * @obj__: the &drm_gem_object the &drm_gpuvm_bo to walk are
associated with
*
- * This iterator walks over all &drm_gpuva structures associated
with the
+ * This iterator walks over all &drm_gpuvm_bo 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, gem.entry)
+#define drm_gem_for_each_gpuvm_bo_safe(entry__, next__, obj__) \
+ list_for_each_entry_safe(entry__, next__, &(obj__)-
gpuva.list, list.entry.gem)
#endif /* __DRM_GEM_H__ */
diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index 47cbacb244b9..466fdd76c71a 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -25,6 +25,7 @@
* OTHER DEALINGS IN THE SOFTWARE.
*/
+#include <linux/dma-resv.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/types.h>
@@ -33,6 +34,7 @@
#include <drm/drm_gem.h>
struct drm_gpuvm;
+struct drm_gpuvm_bo;
struct drm_gpuvm_ops;
/**
@@ -73,6 +75,12 @@ struct drm_gpuva {
*/
struct drm_gpuvm *vm;
+ /**
+ * @vm_bo: the &drm_gpuvm_bo abstraction for the mapped
+ * &drm_gem_object
+ */
+ struct drm_gpuvm_bo *vm_bo;
+
/**
* @flags: the &drm_gpuva_flags for this mapping
*/
@@ -108,7 +116,7 @@ struct drm_gpuva {
struct drm_gem_object *obj;
/**
- * @entry: the &list_head to attach this object
to a
&drm_gem_object
+ * @entry: the &list_head to attach this object
to a
&drm_gpuvm_bo
*/
struct list_head entry;
} gem;
@@ -141,7 +149,7 @@ struct drm_gpuva {
int drm_gpuva_insert(struct drm_gpuvm *gpuvm, struct drm_gpuva
*va);
void drm_gpuva_remove(struct drm_gpuva *va);
-void drm_gpuva_link(struct drm_gpuva *va);
+void drm_gpuva_link(struct drm_gpuva *va, struct drm_gpuvm_bo
*vm_bo);
void drm_gpuva_unlink(struct drm_gpuva *va);
struct drm_gpuva *drm_gpuva_find(struct drm_gpuvm *gpuvm,
@@ -188,10 +196,16 @@ static inline bool
drm_gpuva_invalidated(struct
drm_gpuva *va)
* enum drm_gpuvm_flags - flags for struct drm_gpuvm
*/
enum drm_gpuvm_flags {
+ /**
+ * @DRM_GPUVM_RESV_PROTECTED: GPUVM is protected
externally
by the
+ * GPUVM's &dma_resv lock
+ */
+ DRM_GPUVM_RESV_PROTECTED = BIT(0),
+
/**
* @DRM_GPUVM_USERBITS: user defined bits
*/
- DRM_GPUVM_USERBITS = BIT(0),
+ DRM_GPUVM_USERBITS = BIT(1),
};
/**
@@ -280,6 +294,19 @@ bool drm_gpuvm_interval_empty(struct
drm_gpuvm
*gpuvm, u64 addr, u64 range);
struct drm_gem_object *
drm_gpuvm_resv_object_alloc(struct drm_device *drm);
+/**
+ * drm_gpuvm_resv_protected() - indicates whether
&DRM_GPUVM_RESV_PROTECTED is
+ * set
+ * @gpuvm: the &drm_gpuvm
+ *
+ * Returns: true if &DRM_GPUVM_RESV_PROTECTED is set, false
otherwise.
+ */
+static inline bool
+drm_gpuvm_resv_protected(struct drm_gpuvm *gpuvm)
+{
+ return gpuvm->flags & DRM_GPUVM_RESV_PROTECTED;
+}
+
/**
* drm_gpuvm_resv() - returns the &drm_gpuvm's &dma_resv
* @gpuvm__: the &drm_gpuvm
@@ -298,6 +325,12 @@ drm_gpuvm_resv_object_alloc(struct
drm_device
*drm);
*/
#define drm_gpuvm_resv_obj(gpuvm__) ((gpuvm__)->r_obj)
+#define drm_gpuvm_resv_held(gpuvm__) \
+ dma_resv_held(drm_gpuvm_resv(gpuvm__))
+
+#define drm_gpuvm_resv_assert_held(gpuvm__) \
+ dma_resv_assert_held(drm_gpuvm_resv(gpuvm__))
+
#define drm_gpuvm_resv_held(gpuvm__) \
dma_resv_held(drm_gpuvm_resv(gpuvm__))
@@ -382,6 +415,128 @@ __drm_gpuva_next(struct drm_gpuva *va)
#define drm_gpuvm_for_each_va_safe(va__, next__, gpuvm__) \
list_for_each_entry_safe(va__, next__, &(gpuvm__)-
rb.list,
rb.entry)
+/**
+ * struct drm_gpuvm_bo - structure representing a &drm_gpuvm and
+ * &drm_gem_object combination
+ *
+ * This structure is an abstraction representing a &drm_gpuvm
and
+ * &drm_gem_object combination. It serves as an indirection to
accelerate
+ * iterating all &drm_gpuvas within a &drm_gpuvm backed by the
same
+ * &drm_gem_object.
+ *
+ * Furthermore it is used cache evicted GEM objects for a
certain
GPU-VM to
+ * accelerate validation.
+ *
+ * Typically, drivers want to create an instance of a struct
drm_gpuvm_bo once
+ * a GEM object is mapped first in a GPU-VM and release the
instance
once the
+ * last mapping of the GEM object in this GPU-VM is unmapped.
+ */
+struct drm_gpuvm_bo {
+ /**
+ * @vm: The &drm_gpuvm the @obj is mapped in. This
pointer is
not
+ * reference counted.
+ *
+ * A struct drm_gpuvm_bo is not allowed to out-live its
&drm_gpuvm
+ * context. Implicitly, this is ensured by the fact that
the
driver is
+ * responsible to ensure the VM doesn't contain mappings
once
it's
+ * freed, since a struct drm_gpuvm_bo should be freed
once
the last
+ * mapping being backed by the corresponding buffer
object is
unmapped.
+ */
