Re: [PATCH v2 2/4] drm/panthor: Make sure the tiler initial/max chunks are consistent
On 30/04/2024 12:28, Boris Brezillon wrote:
> It doesn't make sense to have a maximum number of chunks smaller than
> the initial number of chunks attached to the context.
>
> Fix the uAPI header to reflect the new constraint, and mention the
> undocumented "initial_chunk_count > 0" constraint while at it.
>
> v2:
> - Fix the check
>
> Fixes: 9cca48fa4f89 ("drm/panthor: Add the heap logical block")
> Signed-off-by: Boris Brezillon
Reviewed-by: Steven Price
Thanks,
Steve
> ---
> drivers/gpu/drm/panthor/panthor_heap.c | 3 +++
> include/uapi/drm/panthor_drm.h | 8 ++--
> 2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/panthor/panthor_heap.c
> b/drivers/gpu/drm/panthor/panthor_heap.c
> index c3c0ba744937..3be86ec383d6 100644
> --- a/drivers/gpu/drm/panthor/panthor_heap.c
> +++ b/drivers/gpu/drm/panthor/panthor_heap.c
> @@ -281,6 +281,9 @@ int panthor_heap_create(struct panthor_heap_pool *pool,
> if (initial_chunk_count == 0)
> return -EINVAL;
>
> + if (initial_chunk_count > max_chunks)
> + return -EINVAL;
> +
> if (hweight32(chunk_size) != 1 ||
> chunk_size < SZ_256K || chunk_size > SZ_2M)
> return -EINVAL;
> diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
> index dadb05ab1235..5db80a0682d5 100644
> --- a/include/uapi/drm/panthor_drm.h
> +++ b/include/uapi/drm/panthor_drm.h
> @@ -895,13 +895,17 @@ struct drm_panthor_tiler_heap_create {
> /** @vm_id: VM ID the tiler heap should be mapped to */
> __u32 vm_id;
>
> - /** @initial_chunk_count: Initial number of chunks to allocate. */
> + /** @initial_chunk_count: Initial number of chunks to allocate. Must be
> at least one. */
> __u32 initial_chunk_count;
>
> /** @chunk_size: Chunk size. Must be a power of two at least 256KB
> large. */
> __u32 chunk_size;
>
> - /** @max_chunks: Maximum number of chunks that can be allocated. */
> + /**
> + * @max_chunks: Maximum number of chunks that can be allocated.
> + *
> + * Must be at least @initial_chunk_count.
> + */
> __u32 max_chunks;
>
> /**
Re: [PATCH v2 2/4] drm/panthor: Make sure the tiler initial/max chunks are consistent
On Tue, Apr 30, 2024 at 01:28:50PM +0200, Boris Brezillon wrote:
> It doesn't make sense to have a maximum number of chunks smaller than
> the initial number of chunks attached to the context.
>
> Fix the uAPI header to reflect the new constraint, and mention the
> undocumented "initial_chunk_count > 0" constraint while at it.
>
> v2:
> - Fix the check
>
> Fixes: 9cca48fa4f89 ("drm/panthor: Add the heap logical block")
> Signed-off-by: Boris Brezillon
> ---
> drivers/gpu/drm/panthor/panthor_heap.c | 3 +++
> include/uapi/drm/panthor_drm.h | 8 ++--
> 2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/panthor/panthor_heap.c
> b/drivers/gpu/drm/panthor/panthor_heap.c
> index c3c0ba744937..3be86ec383d6 100644
> --- a/drivers/gpu/drm/panthor/panthor_heap.c
> +++ b/drivers/gpu/drm/panthor/panthor_heap.c
> @@ -281,6 +281,9 @@ int panthor_heap_create(struct panthor_heap_pool *pool,
> if (initial_chunk_count == 0)
> return -EINVAL;
>
> + if (initial_chunk_count > max_chunks)
> + return -EINVAL;
> +
Is is just me that feels like a lost opportunity to merge the check with the
one above?
if (!initial_chunk_count || initial_chunk_count > max_chunks)
return -EINVAL;
Otherwise, Reviewed-by: Liviu Dudau
Best regards,
Liviu
> if (hweight32(chunk_size) != 1 ||
> chunk_size < SZ_256K || chunk_size > SZ_2M)
> return -EINVAL;
> diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
> index dadb05ab1235..5db80a0682d5 100644
> --- a/include/uapi/drm/panthor_drm.h
> +++ b/include/uapi/drm/panthor_drm.h
> @@ -895,13 +895,17 @@ struct drm_panthor_tiler_heap_create {
> /** @vm_id: VM ID the tiler heap should be mapped to */
> __u32 vm_id;
>
> - /** @initial_chunk_count: Initial number of chunks to allocate. */
> + /** @initial_chunk_count: Initial number of chunks to allocate. Must be
> at least one. */
> __u32 initial_chunk_count;
>
> /** @chunk_size: Chunk size. Must be a power of two at least 256KB
> large. */
> __u32 chunk_size;
>
> - /** @max_chunks: Maximum number of chunks that can be allocated. */
> + /**
> + * @max_chunks: Maximum number of chunks that can be allocated.
> + *
> + * Must be at least @initial_chunk_count.
> + */
> __u32 max_chunks;
>
> /**
> --
> 2.44.0
>
--
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---
¯\_(ツ)_/¯
[PATCH v2 2/4] drm/panthor: Make sure the tiler initial/max chunks are consistent
It doesn't make sense to have a maximum number of chunks smaller than
the initial number of chunks attached to the context.
Fix the uAPI header to reflect the new constraint, and mention the
undocumented "initial_chunk_count > 0" constraint while at it.
v2:
- Fix the check
Fixes: 9cca48fa4f89 ("drm/panthor: Add the heap logical block")
Signed-off-by: Boris Brezillon
---
drivers/gpu/drm/panthor/panthor_heap.c | 3 +++
include/uapi/drm/panthor_drm.h | 8 ++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/panthor/panthor_heap.c
b/drivers/gpu/drm/panthor/panthor_heap.c
index c3c0ba744937..3be86ec383d6 100644
--- a/drivers/gpu/drm/panthor/panthor_heap.c
+++ b/drivers/gpu/drm/panthor/panthor_heap.c
@@ -281,6 +281,9 @@ int panthor_heap_create(struct panthor_heap_pool *pool,
if (initial_chunk_count == 0)
return -EINVAL;
+ if (initial_chunk_count > max_chunks)
+ return -EINVAL;
+
if (hweight32(chunk_size) != 1 ||
chunk_size < SZ_256K || chunk_size > SZ_2M)
return -EINVAL;
diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
index dadb05ab1235..5db80a0682d5 100644
--- a/include/uapi/drm/panthor_drm.h
+++ b/include/uapi/drm/panthor_drm.h
@@ -895,13 +895,17 @@ struct drm_panthor_tiler_heap_create {
/** @vm_id: VM ID the tiler heap should be mapped to */
__u32 vm_id;
- /** @initial_chunk_count: Initial number of chunks to allocate. */
+ /** @initial_chunk_count: Initial number of chunks to allocate. Must be
at least one. */
__u32 initial_chunk_count;
/** @chunk_size: Chunk size. Must be a power of two at least 256KB
large. */
__u32 chunk_size;
- /** @max_chunks: Maximum number of chunks that can be allocated. */
+ /**
+* @max_chunks: Maximum number of chunks that can be allocated.
+*
+* Must be at least @initial_chunk_count.
+*/
__u32 max_chunks;
/**
--
2.44.0
