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drm/panfrost: Add support for GPU heap allocations

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The midgard/bifrost GPUs need to allocate GPU heap memory which is
allocated on GPU page faults and not pinned in memory. The vendor driver
calls this functionality GROW_ON_GPF.

This implementation assumes that BOs allocated with the
PANFROST_BO_NOEXEC flag are never mmapped or exported. Both of those may
actually work, but I'm unsure if there's some interaction there. It
would cause the whole object to be pinned in memory which would defeat
the point of this.

On faults, we map in 2MB at a time in order to utilize huge pages (if
enabled). Currently, once we've mapped pages in, they are only unmapped
if the BO is freed. Once we add shrinker support, we can unmap pages
with the shrinker.

Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190808222200.13176-9-robh@kernel.org
This commit is contained in:
Rob Herring
2019-07-26 16:09:43 -06:00
parent b31bdd1389
commit 187d292920
6 changed files with 172 additions and 17 deletions
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11
drivers/gpu/drm/panfrost/panfrost_drv.c
View File

@@ -82,7 +82,12 @@ static int panfrost_ioctl_create_bo(struct drm_device *dev, void *data,
struct drm_panfrost_create_bo *args = data;
if (!args->size || args->pad ||
(args->flags & ~PANFROST_BO_NOEXEC))
(args->flags & ~(PANFROST_BO_NOEXEC | PANFROST_BO_HEAP)))
return -EINVAL;
/* Heaps should never be executable */
if ((args->flags & PANFROST_BO_HEAP) &&
!(args->flags & PANFROST_BO_NOEXEC))
return -EINVAL;
bo = panfrost_gem_create_with_handle(file, dev, args->size, args->flags,
@@ -297,6 +302,10 @@ static int panfrost_ioctl_mmap_bo(struct drm_device *dev, void *data,
return -ENOENT;
}
/* Don't allow mmapping of heap objects as pages are not pinned. */
if (to_panfrost_bo(gem_obj)->is_heap)
return -EINVAL;
ret = drm_gem_create_mmap_offset(gem_obj);
if (ret == 0)
args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);