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Message-ID: <65e96c3465a47440ca44b3182e257cb40e745f8b.camel@linux.intel.com>
Date: Fri, 13 Oct 2023 13:38:12 +0200
From: Thomas Hellström
<thomas.hellstrom@...ux.intel.com>
To: Danilo Krummrich <dakr@...hat.com>, airlied@...il.com,
daniel@...ll.ch, matthew.brost@...el.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
Subject: Re: [PATCH drm-misc-next v6 1/6] drm/gpuvm: add common dma-resv per
struct drm_gpuvm
On Mon, 2023-10-09 at 01:32 +0200, Danilo Krummrich wrote:
> 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.
>
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
> ---
> drivers/gpu/drm/drm_gpuvm.c | 56
> +++++++++++++++++++++++++-
> drivers/gpu/drm/nouveau/nouveau_uvmm.c | 13 +++++-
> include/drm/drm_gpuvm.h | 35 +++++++++++++++-
> 3 files changed, 99 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gpuvm.c
> b/drivers/gpu/drm/drm_gpuvm.c
> index 02ecb45a2544..ebda9d594165 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 'root object', which serves as the container
Nit: Perhaps resv object altough it might typically be the root page-
table object, that doesn't have any meaning to drm_gpuvm, which uses it
solely as a container for the resv?
> of the
> + * GPUVM's shared &dma_resv. This root 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_root_object_alloc().
> */
>
> /**
> @@ -652,9 +661,47 @@ 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_root_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_root_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_root_object_alloc);
> +
> /**
> * drm_gpuvm_init() - initialize a &drm_gpuvm
> * @gpuvm: pointer to the &drm_gpuvm to initialize
> + * @r_obj: the root &drm_gem_object providing the GPUVM's common
> &dma_resv
> * @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
> @@ -668,7 +715,7 @@ drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
> * &name is expected to be managed by the surrounding driver
> structures.
> */
> void
> -drm_gpuvm_init(struct drm_gpuvm *gpuvm,
> +drm_gpuvm_init(struct drm_gpuvm *gpuvm, struct drm_gem_object
> *r_obj,
> const char *name,
> u64 start_offset, u64 range,
> u64 reserve_offset, u64 reserve_range,
> @@ -683,6 +730,9 @@ drm_gpuvm_init(struct drm_gpuvm *gpuvm,
>
> gpuvm->name = name ? name : "unknown";
> gpuvm->ops = ops;
> + gpuvm->r_obj = r_obj;
> +
> + drm_gem_object_get(r_obj);
>
> memset(&gpuvm->kernel_alloc_node, 0, sizeof(struct
> drm_gpuva));
>
> @@ -713,7 +763,9 @@ drm_gpuvm_destroy(struct drm_gpuvm *gpuvm)
> __drm_gpuva_remove(&gpuvm->kernel_alloc_node);
>
> WARN(!RB_EMPTY_ROOT(&gpuvm->rb.tree.rb_root),
> - "GPUVA tree is not empty, potentially leaking memory.");
> + "GPUVA tree is not empty, potentially leaking
> memory.\n");
Should we cache the drm device in struct drm_gpuvm and use drm_warn()
here instead of WARN?
> +
> + 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 5cf892c50f43..4dea847ef989 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
> @@ -1808,8 +1808,9 @@ int
> nouveau_uvmm_init(struct nouveau_uvmm *uvmm, struct nouveau_cli
> *cli,
> u64 kernel_managed_addr, u64 kernel_managed_size)
> {
> - 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);
> @@ -1833,14 +1834,22 @@ nouveau_uvmm_init(struct nouveau_uvmm *uvmm,
> struct nouveau_cli *cli,
> goto out_unlock;
> }
>
> + r_obj = drm_gpuvm_root_object_alloc(cli->drm->dev);
> + 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_gpuvm_init(&uvmm->base, r_obj, cli->name,
> 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 c7ed6bf441d4..0aec14d8b259 100644
> --- a/include/drm/drm_gpuvm.h
> +++ b/include/drm/drm_gpuvm.h
> @@ -238,9 +238,15 @@ struct drm_gpuvm {
> * @ops: &drm_gpuvm_ops providing the split/merge steps to
> drivers
> */
> const struct drm_gpuvm_ops *ops;
> +
> + /**
> + * @r_obj: Root 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,
> +void drm_gpuvm_init(struct drm_gpuvm *gpuvm, struct drm_gem_object
> *r_obj,
> + const char *name,
> u64 start_offset, u64 range,
> u64 reserve_offset, u64 reserve_range,
> const struct drm_gpuvm_ops *ops);
> @@ -248,6 +254,33 @@ 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_root_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)
> {
Reviewed-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
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