diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/4266-drm-amdkfd-CMA-Add-intermediate-wait-if-mGPU.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/4266-drm-amdkfd-CMA-Add-intermediate-wait-if-mGPU.patch | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/4266-drm-amdkfd-CMA-Add-intermediate-wait-if-mGPU.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/4266-drm-amdkfd-CMA-Add-intermediate-wait-if-mGPU.patch new file mode 100644 index 00000000..8c8c2bbd --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/4266-drm-amdkfd-CMA-Add-intermediate-wait-if-mGPU.patch @@ -0,0 +1,77 @@ +From dcc8d6fb42976e899c75091092c3ecb1532b6afa Mon Sep 17 00:00:00 2001 +From: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com> +Date: Thu, 12 Apr 2018 14:24:22 -0400 +Subject: [PATCH 4266/5725] drm/amdkfd: CMA: Add intermediate wait if mGPU + +CMA can happen on multiple GPUs. The current approach of keeping track +of only the latest fence is not sufficient. Before throwing away the old +fence check if it belongs to the same context. If not wait before +releasing it. + +The current approach will be suboptimal in a mGPU (> 2) system if CMA +ioctl is called with a long list of memory ranges where potentially each +range copy could be done by different GPU. In this situation, the better +approach would be to call the ioctl repeatedly with shorter list. + +Change-Id: Icf522cf8bfa648e24900745622600f920c0de320 +Signed-off-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com> +--- + drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 25 +++++++++++++++++++++++-- + 1 file changed, 23 insertions(+), 2 deletions(-) + +diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +index 9426a66..b07fe36 100644 +--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c ++++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +@@ -1853,6 +1853,20 @@ static int kfd_cma_fence_wait(struct dma_fence *f) + return ret; + } + ++/* Put previous (old) fence @pf but it waits for @pf to signal if the context ++ * of the current fence @cf is different. ++ */ ++static int kfd_fence_put_wait_if_diff_context(struct dma_fence *cf, ++ struct dma_fence *pf) ++{ ++ int ret = 0; ++ ++ if (pf && cf && cf->context != pf->context) ++ ret = kfd_cma_fence_wait(pf); ++ dma_fence_put(pf); ++ return ret; ++} ++ + /* Create a system BO by pinning underlying system pages of the given userptr + * BO @ubo + * @ubo: Userptr BO +@@ -2230,9 +2244,13 @@ static int kfd_copy_single_range(struct cma_iter *si, struct cma_iter *di, + } + + if (fence) { +- dma_fence_put(lfence); ++ err = kfd_fence_put_wait_if_diff_context(fence, ++ lfence); + lfence = fence; ++ if (err) ++ break; + } ++ + size -= n; + *copied += n; + err = kfd_cma_iter_advance(si, n); +@@ -2374,8 +2392,11 @@ static int kfd_ioctl_cross_memory_copy(struct file *filep, + * new fence is created, then keep the preivous fence + */ + if (fence) { +- dma_fence_put(lfence); ++ err = kfd_fence_put_wait_if_diff_context(fence, ++ lfence); + lfence = fence; ++ if (err) ++ break; + } + } + +-- +2.7.4 + |