From: Boris Brezillon <boris.brezillon@collabora.com>
To: "Boris Brezillon" <boris.brezillon@collabora.com>,
"Steven Price" <steven.price@arm.com>,
"Liviu Dudau" <liviu.dudau@arm.com>,
"Adrián Larumbe" <adrian.larumbe@collabora.com>
Cc: dri-devel@lists.freedesktop.org, kernel@collabora.com
Subject: [PATCH v3 2/5] drm/panthor: Make sure the tiler initial/max chunks are consistent
Date: Thu, 2 May 2024 17:40:22 +0200 [thread overview]
Message-ID: <20240502154025.1425278-3-boris.brezillon@collabora.com> (raw)
In-Reply-To: <20240502154025.1425278-1-boris.brezillon@collabora.com>
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.
v3:
- Add R-b
v2:
- Fix the check
Fixes: 9cca48fa4f89 ("drm/panthor: Add the heap logical block")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
---
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
next prev parent reply other threads:[~2024-05-02 15:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-02 15:40 [PATCH v3 0/5] drm/panthor: Collection of tiler heap related fixes Boris Brezillon
2024-05-02 15:40 ` [PATCH v3 1/5] drm/panthor: Fix tiler OOM handling to allow incremental rendering Boris Brezillon
2024-05-02 15:40 ` Boris Brezillon [this message]
2024-05-02 15:40 ` [PATCH v3 3/5] drm/panthor: Relax the constraints on the tiler chunk size Boris Brezillon
2024-05-02 15:47 ` Steven Price
2024-05-02 16:53 ` Boris Brezillon
2024-05-02 15:40 ` [PATCH v3 4/5] drm/panthor: Fix an off-by-one in the heap context retrieval logic Boris Brezillon
2024-05-02 15:52 ` Steven Price
2024-05-02 16:52 ` Boris Brezillon
2024-05-02 15:40 ` [PATCH v3 5/5] drm/panthor: Document drm_panthor_tiler_heap_destroy::handle validity constraints Boris Brezillon
2024-05-02 15:52 ` Steven Price
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