[PATCH 1/2] drm/amd/pm: Add debug bit for smu pool allocation

[Lijo Lazar]

In certain cases, it's desirable to avoid PMFW log transactions to
system memory. Add a mask bit to decide whether to allocate smu pool in
device memory or system memory.

Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c   | 5 +++++
 drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h   | 3 ++-
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 5 ++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index b161daa90019..22775c204632 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -140,6 +140,7 @@ enum AMDGPU_DEBUG_MASK {
 	AMDGPU_DEBUG_ENABLE_RAS_ACA = BIT(4),
 	AMDGPU_DEBUG_ENABLE_EXP_RESETS = BIT(5),
 	AMDGPU_DEBUG_DISABLE_GPU_RING_RESET = BIT(6),
+	AMDGPU_DEBUG_SMU_POOL = BIT(7),
 };
 
 unsigned int amdgpu_vram_limit = UINT_MAX;
@@ -2231,6 +2232,10 @@ static void amdgpu_init_debug_options(struct amdgpu_device *adev)
 		pr_info("debug: ring reset disabled\n");
 		adev->debug_disable_gpu_ring_reset = true;
 	}
+	if (amdgpu_debug_mask & AMDGPU_DEBUG_SMU_POOL) {
+		pr_info("debug: use vram for smu pool\n");
+		adev->pm.smu_debug_mask |= SMU_DEBUG_POOL_USE_VRAM;
+	}
 }
 
 static unsigned long amdgpu_fix_asic_type(struct pci_dev *pdev, unsigned long flags)
diff --git a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
index 9fb26b5c8ae7..f93d287dbf13 100644
--- a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
+++ b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
@@ -295,7 +295,8 @@ enum ip_power_state {
 };
 
 /* Used to mask smu debug modes */
-#define SMU_DEBUG_HALT_ON_ERROR		0x1
+#define SMU_DEBUG_HALT_ON_ERROR		BIT(0)
+#define SMU_DEBUG_POOL_USE_VRAM		BIT(1)
 
 #define MAX_SMU_I2C_BUSES       2
 
diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 54a31d586d55..f6def50ba22d 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -1027,7 +1027,10 @@ static int smu_alloc_memory_pool(struct smu_context *smu)
 
 	memory_pool->size = pool_size;
 	memory_pool->align = PAGE_SIZE;
-	memory_pool->domain = AMDGPU_GEM_DOMAIN_GTT;
+	memory_pool->domain =
+		(adev->pm.smu_debug_mask & SMU_DEBUG_POOL_USE_VRAM) ?
+			AMDGPU_GEM_DOMAIN_VRAM :
+			AMDGPU_GEM_DOMAIN_GTT;
 
 	switch (pool_size) {
 	case SMU_MEMORY_POOL_SIZE_256_MB:
-- 
2.25.1