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Message-ID: <20231023201659.25332-3-dakr@redhat.com>
Date: Mon, 23 Oct 2023 22:16:48 +0200
From: Danilo Krummrich <dakr@...hat.com>
To: airlied@...il.com, daniel@...ll.ch, matthew.brost@...el.com,
thomas.hellstrom@...ux.intel.com, sarah.walker@...tec.com,
donald.robson@...tec.com, boris.brezillon@...labora.com,
christian.koenig@....com, faith@...strand.net
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Danilo Krummrich <dakr@...hat.com>
Subject: [PATCH drm-misc-next v7 2/7] drm/gpuvm: add common dma-resv per struct drm_gpuvm
Provide a common dma-resv for GEM objects not being used outside of this
GPU-VM. This is used in a subsequent patch to generalize dma-resv,
external and evicted object handling and GEM validation.
Reviewed-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Signed-off-by: Danilo Krummrich <dakr@...hat.com>
---
drivers/gpu/drm/drm_gpuvm.c | 53 ++++++++++++++++++++++++++
drivers/gpu/drm/nouveau/nouveau_uvmm.c | 13 ++++++-
include/drm/drm_gpuvm.h | 33 ++++++++++++++++
3 files changed, 97 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
index d7367a202fee..b9742742a0e8 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -61,6 +61,15 @@
* contained within struct drm_gpuva already. Hence, for inserting &drm_gpuva
* entries from within dma-fence signalling critical sections it is enough to
* pre-allocate the &drm_gpuva structures.
+ *
+ * &drm_gem_objects which are private to a single VM can share a common
+ * &dma_resv in order to improve locking efficiency (e.g. with &drm_exec).
+ * For this purpose drivers must pass a &drm_gem_object to drm_gpuvm_init(), in
+ * the following called 'resv object', which serves as the container of the
+ * GPUVM's shared &dma_resv. This resv object can be a driver specific
+ * &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().
*/
/**
@@ -652,11 +661,49 @@ drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
!drm_gpuvm_in_kernel_node(gpuvm, addr, range);
}
+static void
+drm_gpuvm_gem_object_free(struct drm_gem_object *obj)
+{
+ drm_gem_object_release(obj);
+ kfree(obj);
+}
+
+static const struct drm_gem_object_funcs drm_gpuvm_object_funcs = {
+ .free = drm_gpuvm_gem_object_free,
+};
+
+/**
+ * drm_gpuvm_resv_object_alloc() - allocate a dummy &drm_gem_object
+ * @drm: the drivers &drm_device
+ *
+ * Allocates a dummy &drm_gem_object which can be passed to drm_gpuvm_init() in
+ * order to serve as root GEM object providing the &drm_resv shared across
+ * &drm_gem_objects local to a single GPUVM.
+ *
+ * Returns: the &drm_gem_object on success, NULL on failure
+ */
+struct drm_gem_object *
+drm_gpuvm_resv_object_alloc(struct drm_device *drm)
+{
+ struct drm_gem_object *obj;
+
+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+ if (!obj)
+ return NULL;
+
+ obj->funcs = &drm_gpuvm_object_funcs;
+ drm_gem_private_object_init(drm, obj, 0);
+
+ return obj;
+}
+EXPORT_SYMBOL_GPL(drm_gpuvm_resv_object_alloc);
+
/**
* drm_gpuvm_init() - initialize a &drm_gpuvm
* @gpuvm: pointer to the &drm_gpuvm to initialize
* @name: the name of the GPU VA space
* @drm: the &drm_device this VM resides in
+ * @r_obj: the resv &drm_gem_object providing the GPUVM's common &dma_resv
* @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
@@ -671,6 +718,7 @@ drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
void
drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
struct drm_device *drm,
+ struct drm_gem_object *r_obj,
u64 start_offset, u64 range,
u64 reserve_offset, u64 reserve_range,
const struct drm_gpuvm_ops *ops)
@@ -681,6 +729,9 @@ drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
gpuvm->name = name ? name : "unknown";
gpuvm->ops = ops;
gpuvm->drm = drm;
+ gpuvm->r_obj = r_obj;
+
+ drm_gem_object_get(r_obj);
drm_gpuvm_check_overflow(gpuvm, start_offset, range);
gpuvm->mm_start = start_offset;
@@ -715,6 +766,8 @@ drm_gpuvm_destroy(struct drm_gpuvm *gpuvm)
drm_WARN(gpuvm->drm, !RB_EMPTY_ROOT(&gpuvm->rb.tree.rb_root),
"GPUVA tree is not empty, potentially leaking memory.\n");
+
+ drm_gem_object_put(gpuvm->r_obj);
}
EXPORT_SYMBOL_GPL(drm_gpuvm_destroy);
diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.c b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
index aaf5d28bd587..b4e7d662961a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
@@ -1809,8 +1809,9 @@ nouveau_uvmm_init(struct nouveau_uvmm *uvmm, struct nouveau_cli *cli,
u64 kernel_managed_addr, u64 kernel_managed_size)
{
struct drm_device *drm = cli->drm->dev;
- int ret;
+ struct drm_gem_object *r_obj;
u64 kernel_managed_end = kernel_managed_addr + kernel_managed_size;
+ int ret;
mutex_init(&uvmm->mutex);
dma_resv_init(&uvmm->resv);
@@ -1834,14 +1835,22 @@ nouveau_uvmm_init(struct nouveau_uvmm *uvmm, struct nouveau_cli *cli,
goto out_unlock;
}
+ r_obj = drm_gpuvm_resv_object_alloc(drm);
+ if (!r_obj) {
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
+
uvmm->kernel_managed_addr = kernel_managed_addr;
uvmm->kernel_managed_size = kernel_managed_size;
- drm_gpuvm_init(&uvmm->base, cli->name, drm,
+ drm_gpuvm_init(&uvmm->base, cli->name, drm, r_obj,
NOUVEAU_VA_SPACE_START,
NOUVEAU_VA_SPACE_END,
kernel_managed_addr, kernel_managed_size,
NULL);
+ /* GPUVM takes care from here on. */
+ drm_gem_object_put(r_obj);
ret = nvif_vmm_ctor(&cli->mmu, "uvmm",
cli->vmm.vmm.object.oclass, RAW,
diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index 687fd5893624..5f43a224d0f4 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -244,10 +244,16 @@ struct drm_gpuvm {
* @ops: &drm_gpuvm_ops providing the split/merge steps to drivers
*/
const struct drm_gpuvm_ops *ops;
+
+ /**
+ * @r_obj: Resv GEM object; representing the GPUVM's common &dma_resv.
+ */
+ struct drm_gem_object *r_obj;
};
void drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
struct drm_device *drm,
+ struct drm_gem_object *r_obj,
u64 start_offset, u64 range,
u64 reserve_offset, u64 reserve_range,
const struct drm_gpuvm_ops *ops);
@@ -255,6 +261,33 @@ void drm_gpuvm_destroy(struct drm_gpuvm *gpuvm);
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() - returns the &drm_gpuvm's &dma_resv
+ * @gpuvm__: the &drm_gpuvm
+ *
+ * Returns: a pointer to the &drm_gpuvm's shared &dma_resv
+ */
+#define drm_gpuvm_resv(gpuvm__) ((gpuvm__)->r_obj->resv)
+
+/**
+ * drm_gpuvm_resv_obj() - returns the &drm_gem_object holding the &drm_gpuvm's
+ * &dma_resv
+ * @gpuvm__: the &drm_gpuvm
+ *
+ * Returns: a pointer to the &drm_gem_object holding the &drm_gpuvm's shared
+ * &dma_resv
+ */
+#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__))
+
static inline struct drm_gpuva *
__drm_gpuva_next(struct drm_gpuva *va)
{
--
2.41.0
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