From: "Tianci.Yin" <tianci.yin@xxxxxxx>
[why]
In dual GPUs scenario, stolen_size is assigned to zero on the 2nd GPU,
then the bottom region of VRAM was allocated as GTT, unfortunately
a small region of bottom VRAM was encroached by UMC firmware during
GDDR6 BIST training, this cause pagefault.
[how]
Forcing stolen_size to 3MB, then the bottom region of VRAM was
allocated as stolen memory, GTT corruption avoid.
The stolen memory of the 2nd GPU will be free in late_init phase,
no memory wasted.
Change-Id: Icd0ad7de41333282949bb1e3e676c6c307ddd081
Signed-off-by: Tianci.Yin <tianci.yin@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h | 6 ++++++
drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 21 +++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index c91dd602d5f1..440b793316df 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -60,6 +60,11 @@
*/
#define AMDGPU_GMC_FAULT_TIMEOUT 5000ULL
+/*
+ * Default stolen memory size, 1024 * 768 * 4
+ */
+#define AMDGPU_STOLEN_VGA_DEFAULT_SIZE 0x300000
+
struct firmware;
/*
@@ -192,6 +197,7 @@ struct amdgpu_gmc {
uint32_t srbm_soft_reset;
bool prt_warning;
uint64_t stolen_size;
+ bool stolen_temp_reserved;
/* apertures */
u64 shared_aperture_start;
u64 shared_aperture_end;
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 7dc8c068c62a..0c96b67d6ca7 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -566,6 +566,11 @@ static int gmc_v10_0_late_init(void *handle)
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
int r;
+ if (adev->gmc.stolen_temp_reserved) {
+ amdgpu_bo_late_init(adev);
+ adev->gmc.stolen_temp_reserved = false;
+ }
+
r = amdgpu_gmc_allocate_vm_inv_eng(adev);
if (r)
return r;
@@ -756,6 +761,22 @@ static int gmc_v10_0_sw_init(void *handle)
return r;
adev->gmc.stolen_size = gmc_v10_0_get_vbios_fb_size(adev);
+ /*
+ * In dual GPUs scenario, stolen_size is assigned to zero on the 2nd GPU,
+ * then the bottom region of VRAM was allocated as GTT, unfortunately
+ * a small region of bottom VRAM was encroached by UMC firmware during
+ * GDDR6 BIST training, this cause pagefault.
+ * The page fault can be fixed by forcing stolen_size to 3MB, then the bottom
+ * region of VRAM was allocated as stolen memory, GTT corruption avoid.
+ * The stolen memory of the 2nd GPU will be free in late_init phase,
+ * no memory wasted.
+ */
+ if (adev->fw_vram_usage.mem_train_support &&
+ adev->gmc.stolen_size == 0) {
+ adev->gmc.stolen_size = AMDGPU_STOLEN_VGA_DEFAULT_SIZE;
+ adev->gmc.stolen_temp_reserved = true;
+ } else
+ adev->gmc.stolen_temp_reserved = false;
/* Memory manager */
r = amdgpu_bo_init(adev);
--
2.17.1
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