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drm/amdkfd: option to disable system mem limit

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If multiple process share system memory through /dev/shm, KFD allocate
memory should not fail if it reaches the system memory limit because
one copy of physical system memory are shared by multiple process.

Add module parameter no_system_mem_limit to provide user option to
disable system memory limit check at runtime using sysfs or during
driver module init using kernel boot argument. By default the system
memory limit is on.

Print out debug message to warn user if KFD allocate memory failed
because system memory reaches limit.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang 2020-07-27 09:06:18 -04:00 • committed by Alex Deucher
parent c35376137e
commit b80f050ff2
3 changed files with 16 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View file

@ -188,9 +188,11 @@ extern int amdgpu_force_asic_type;
#ifdef CONFIG_HSA_AMD
extern int sched_policy;
extern bool debug_evictions;
extern bool no_system_mem_limit;
#else
static const int sched_policy = KFD_SCHED_POLICY_HWS;
static const bool debug_evictions; /* = false */
static const bool no_system_mem_limit;
#endif
extern int amdgpu_tmz;

6
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
View file

@ -148,8 +148,12 @@ static int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
spin_lock(&kfd_mem_limit.mem_limit_lock);
if (kfd_mem_limit.system_mem_used + system_mem_needed >
kfd_mem_limit.max_system_mem_limit)
pr_debug("Set no_system_mem_limit=1 if using shared memory\n");
if ((kfd_mem_limit.system_mem_used + system_mem_needed >
kfd_mem_limit.max_system_mem_limit) ||
kfd_mem_limit.max_system_mem_limit && !no_system_mem_limit) ||
(kfd_mem_limit.ttm_mem_used + ttm_mem_needed >
kfd_mem_limit.max_ttm_mem_limit) ||
(adev->kfd.vram_used + vram_needed >

9
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
View file

@ -717,6 +717,15 @@ MODULE_PARM_DESC(queue_preemption_timeout_ms, "queue preemption timeout in ms (1
bool debug_evictions;
module_param(debug_evictions, bool, 0644);
MODULE_PARM_DESC(debug_evictions, "enable eviction debug messages (false = default)");
/**
* DOC: no_system_mem_limit(bool)
* Disable system memory limit, to support multiple process shared memory
*/
bool no_system_mem_limit;
module_param(no_system_mem_limit, bool, 0644);
MODULE_PARM_DESC(no_system_mem_limit, "disable system memory limit (false = default)");
#endif
/**