linux-kernel - [PATCH] amdgpu: use dma-resv API instead of manual kmalloc

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Message-Id: <20200125114624.2093235-1-steve@sk2.org>
Date:   Sat, 25 Jan 2020 12:46:24 +0100
From:   Stephen Kitt <steve@....org>
To:     Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sumit Semwal <sumit.semwal@...aro.org>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        Stephen Kitt <steve@....org>
Subject: [PATCH] amdgpu: use dma-resv API instead of manual kmalloc

Instead of hand-coding the dma_resv_list allocation, use
dma_resv_list_alloc, which masks the shared_max handling. While we're
at it, since we only need shared_count fences, allocate shared_count
fences rather than shared_max.

(This is the only place in the kernel, outside of dma-resv.c, which
touches shared_max. This suggests we'd probably be better off without
it!)

Signed-off-by: Stephen Kitt <steve@....org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 888209eb8cec..aec595752200 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -234,12 +234,11 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
 	if (!old)
 		return 0;
 
-	new = kmalloc(offsetof(typeof(*new), shared[old->shared_max]),
-		      GFP_KERNEL);
+	new = dma_resv_list_alloc(old->shared_count);
 	if (!new)
 		return -ENOMEM;
 
-	/* Go through all the shared fences in the resevation object and sort
+	/* Go through all the shared fences in the reservation object and sort
 	 * the interesting ones to the end of the list.
 	 */
 	for (i = 0, j = old->shared_count, k = 0; i < old->shared_count; ++i) {
@@ -253,7 +252,6 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
 		else
 			RCU_INIT_POINTER(new->shared[k++], f);
 	}
-	new->shared_max = old->shared_max;
 	new->shared_count = k;
 
 	/* Install the new fence list, seqcount provides the barriers */
-- 
2.24.1