From f50d0ffb15aef2cbf419b81cdbc3031097767bff Mon Sep 17 00:00:00 2001 From: Deepak Nibade Date: Thu, 29 Oct 2015 15:20:50 +0530 Subject: gpu: nvgpu: support skipping buffer refcounting in submit In job submission path, we always take refcount on all the mapped buffers to safeguard against case where user space releases the buffer early But in case user space itself is doing proper buffer management, kernel need not take refcounts on all the buffers - which is also a overhead in submit path Hence, provide a new submit flag NVGPU_SUBMIT_GPFIFO_FLAGS_SKIP_BUFFER_REFCOUNTING to optionally skip taking refcounts on all the buffers Also, if we do not take refcounts, then no need to drop any refcounts in gk20a_channel_update() as well Bug 1698667 Bug 200141116 Change-Id: I81bb7a03240300b691c70bcec04ea1badd5934f4 Signed-off-by: Deepak Nibade Reviewed-on: http://git-master/r/824718 (cherry picked from commit 8c8978fa303ec4e6db0233becdbdcbad4a248173) Reviewed-on: http://git-master/r/835801 Reviewed-by: Terje Bergstrom Tested-by: Terje Bergstrom --- include/uapi/linux/nvgpu.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/uapi/linux/nvgpu.h') diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h index d2b5ceb8..025f2c9b 100644 --- a/include/uapi/linux/nvgpu.h +++ b/include/uapi/linux/nvgpu.h @@ -669,6 +669,8 @@ struct nvgpu_fence { #define NVGPU_SUBMIT_GPFIFO_FLAGS_SYNC_FENCE (1 << 3) /* suppress WFI before fence trigger */ #define NVGPU_SUBMIT_GPFIFO_FLAGS_SUPPRESS_WFI (1 << 4) +/* skip buffer refcounting during submit */ +#define NVGPU_SUBMIT_GPFIFO_FLAGS_SKIP_BUFFER_REFCOUNTING (1 << 5) struct nvgpu_submit_gpfifo_args { __u64 gpfifo; -- cgit v1.2.2