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authorRob Herring <robh@kernel.org>2019-07-26 16:09:43 -0600
committerRob Herring <robh@kernel.org>2019-08-12 14:21:37 -0600
commit187d2929206e6b098312c174ea873e4cedf5420d (patch)
treec0679df7d1c566543b748fadaf5e00a67bcf46c1 /include
parentb31bdd1389fc765c07ab3d5b341092cb16807d29 (diff)
drm/panfrost: Add support for GPU heap allocations
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
Diffstat (limited to 'include')
-rw-r--r--include/uapi/drm/panfrost_drm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/drm/panfrost_drm.h b/include/uapi/drm/panfrost_drm.h
index b80c20d17dec..ec19db1eead8 100644
--- a/include/uapi/drm/panfrost_drm.h
+++ b/include/uapi/drm/panfrost_drm.h
@@ -85,6 +85,7 @@ struct drm_panfrost_wait_bo {
};
#define PANFROST_BO_NOEXEC 1
+#define PANFROST_BO_HEAP 2
/**
* struct drm_panfrost_create_bo - ioctl argument for creating Panfrost BOs.