media: vsp1: Provide a body pool

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Each display list allocates a body to store register values in a dma
accessible buffer from a dma_alloc_wc() allocation. Each of these
results in an entry in the IOMMU TLB, and a large number of display list
allocations adds pressure to this resource.

Reduce TLB pressure on the IPMMUs by allocating multiple display list
bodies in a single allocation, and providing these to the display list
through a 'body pool'. A pool can be allocated by the display list
manager or entities which require their own body allocations.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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Kieran Bingham 2018-05-18 16:41:58 -04:00 • committed by Mauro Carvalho Chehab

parent 0766734197

commit 5de0473982

2 changed files with 171 additions and 0 deletions

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163

drivers/media/platform/vsp1/vsp1_dl.c

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8

drivers/media/platform/vsp1/vsp1_dl.h

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