Am 09.01.20 um 11:17 schrieb Tianci Yin:
From: "Tianci.Yin" <tianci.yin@xxxxxxx>
[why]
In dual GPUs scenario, stolen_size is assigned to zero on the secondary GPU,
since there is no pre-OS console using that memory. 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 page fault.
[how]
Forcing stolen_size to 3MB, then the bottom region of VRAM was
allocated as stolen memory, GTT corruption avoid.
Change-Id: I310a72ba0402994defbe50839842a8edb025a868
Signed-off-by: Tianci.Yin <tianci.yin@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h | 5 +++++
drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 28 +++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index c91dd602d5f1..e4b2f9bcaeb7 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 0x300000ULL
+
struct firmware;
/*
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 7dc8c068c62a..0e0fdf7596eb 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -566,6 +566,13 @@ static int gmc_v10_0_late_init(void *handle)
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
int r;
+ /*
+ * Can't free the stolen VGA memory when it might be used for memory
+ * training again.
+ */
+ if (!adev->fw_vram_usage.mem_train_support)
+ amdgpu_bo_late_init(adev);
+
r = amdgpu_gmc_allocate_vm_inv_eng(adev);
if (r)
return r;
@@ -757,6 +764,19 @@ static int gmc_v10_0_sw_init(void *handle)
adev->gmc.stolen_size = gmc_v10_0_get_vbios_fb_size(adev);
+ /*
+ * In dual GPUs scenario, stolen_size is assigned to zero on the
+ * secondary GPU, since there is no pre-OS console using that memory.
+ * 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 page fault.
+ * 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.
+ */
+ adev->gmc.stolen_size = max(adev->gmc.stolen_size,
+ AMDGPU_STOLEN_VGA_DEFAULT_SIZE);
+
/* Memory manager */
r = amdgpu_bo_init(adev);
if (r)
@@ -796,6 +816,14 @@ static void gmc_v10_0_gart_fini(struct amdgpu_device *adev)
static int gmc_v10_0_sw_fini(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+ void *stolen_vga_buf;
+
+ /*ALU utilization. Because of the way that predication is used to deal
with divergent control-flow, you can end up executing more instructions
than any single invocation needs. As a worst-case example, suppose your
shader starts with a big switch statement where each case is some
non-trivial piece of code. Further suppose that you have some shader
thread where each invocation takes a different case in the switch.
Thanks to the way divergent control-flow has to be handled, you would
end up effectively executing each invocation separately and nothing
would be parallelized.
+ * Free the stolen VGA memory when it might be used for memory training.
+ */
+ if (adev->fw_vram_usage.mem_train_support)
You can drop the "if", freeing the BO twice is harmless because we set
the pointer to NULL after the first time.
You might also want to clearify the comment a bit, something like "Free
the stolen memory if it wasn't already freed in late_init because of
memory training".
Apart from that looks good to me as well, but you should sync with Alex
who is going to do the patches.
Cheers,
Christian.
+ amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL,
+ &stolen_vga_buf);
amdgpu_vm_manager_fini(adev);
gmc_v10_0_gart_fini(adev);
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