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gpu: nvgpu: add FOREIGN_SGT mem flag

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Add an internal flag NVGPU_MEM_FLAG_FOREIGN_SGT to specify that the sgt
member of an nvgpu_mem must not be freed when the nvgpu_mem is freed.

Bug 200145225

Change-Id: I044fb91a5f9d148f38fb0cbf63d0cdfd64a070ce
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1819801
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Konsta Holtta
2018-09-11 14:47:42 +03:00
committed by mobile promotions
parent f33935f426
commit 9de6d20abb
2 changed files with 12 additions and 1 deletions
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9
drivers/gpu/nvgpu/include/nvgpu/nvgpu_mem.h
View File

@@ -177,6 +177,15 @@ struct nvgpu_mem {
* nvgpu_mem in a system specific way.
*/
#define __NVGPU_MEM_FLAG_NO_DMA (1 << 3)
/*
* Some nvgpu_mem objects act as facades to memory buffers owned by
* someone else. This internal flag specifies that the sgt field is
* "borrowed", and it must not be freed by us.
*
* Of course the caller will have to make sure that the sgt owner
* outlives the nvgpu_mem.
*/
#define NVGPU_MEM_FLAG_FOREIGN_SGT (1 << 4)
unsigned long mem_flags;
/*

4
drivers/gpu/nvgpu/os/linux/linux-dma.c
View File

@@ -392,8 +392,10 @@ void nvgpu_dma_free_sys(struct gk20a *g, struct nvgpu_mem *mem)
if (mem->mem_flags & __NVGPU_MEM_FLAG_NO_DMA)
nvgpu_kfree(g, mem->priv.pages);
if (mem->priv.sgt)
if ((mem->mem_flags & NVGPU_MEM_FLAG_FOREIGN_SGT) == 0 &&
mem->priv.sgt != NULL) {
nvgpu_free_sgtable(g, &mem->priv.sgt);
}
dma_dbg_free_done(g, mem->size, "sysmem");