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From 11933e722470125fcdf2ef58adc0fed669fca5cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Fri, 7 Sep 2018 14:21:15 +0200
Subject: [PATCH 0363/2940] drm/amdgpu: use the maximum possible fragment size
on Vega/Raven
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The fragment size controls only the L1 on Vega/Raven and we now don't
have any extra overhead any more because of larger fragments.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Junwei Zhang <Jerry.Zhang@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 67abbf183a20..fac7760a3eda 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1535,8 +1535,16 @@ static void amdgpu_vm_fragment(struct amdgpu_pte_update_params *params,
* larger. Thus, we try to use large fragments wherever possible.
* Userspace can support this by aligning virtual base address and
* allocation size to the fragment size.
+ *
+ * Starting with Vega10 the fragment size only controls the L1. The L2
+ * is now directly feed with small/huge/giant pages from the walker.
*/
- unsigned max_frag = params->adev->vm_manager.fragment_size;
+ unsigned max_frag;
+
+ if (params->adev->asic_type < CHIP_VEGA10)
+ max_frag = params->adev->vm_manager.fragment_size;
+ else
+ max_frag = 31;
/* system pages are non continuously */
if (params->src || !(flags & AMDGPU_PTE_VALID)) {
--
2.17.1
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