[PATCH 1/1] drm/amdgpu: Raise KFD unpinned system memory limit

[Zhao, Yong]

[AMD Official Use Only - Internal Distribution Only]

Reviewed-by: Yong Zhao <Yong.Zhao at amd.com>
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Felix Kuehling <Felix.Kuehling at amd.com>
Sent: Monday, November 25, 2019 4:28 PM
To: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Subject: [PATCH 1/1] drm/amdgpu: Raise KFD unpinned system memory limit

Allow KFD applications to use more unpinned system memory through
HMM.

Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index e43a95514b41..b6d1958d514f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -85,7 +85,7 @@ static bool check_if_add_bo_to_vm(struct amdgpu_vm *avm,
 }

 /* Set memory usage limits. Current, limits are
- *  System (TTM + userptr) memory - 3/4th System RAM
+ *  System (TTM + userptr) memory - 15/16th System RAM
  *  TTM memory - 3/8th System RAM
  */
 void amdgpu_amdkfd_gpuvm_init_mem_limits(void)
@@ -98,7 +98,7 @@ void amdgpu_amdkfd_gpuvm_init_mem_limits(void)
         mem *= si.mem_unit;

         spin_lock_init(&kfd_mem_limit.mem_limit_lock);
-       kfd_mem_limit.max_system_mem_limit = (mem >> 1) + (mem >> 2);
+       kfd_mem_limit.max_system_mem_limit = mem - (mem >> 4);
         kfd_mem_limit.max_ttm_mem_limit = (mem >> 1) - (mem >> 3);
         pr_debug("Kernel memory limit %lluM, TTM limit %lluM\n",
                 (kfd_mem_limit.max_system_mem_limit >> 20),
--
2.24.0

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