[PATCH] drm/amd/display: Set the domain as GTT when VRAM size <= 32 MB

[Deucher, Alexander]

[Public]

I think this may have already been fixed with this patch:
https://gitlab.freedesktop.org/agd5f/linux/-/commit/2a7b9a8437130fd328001f4edfac8eec98dfe298

Alex

________________________________
From: Mahapatra, Rajib <Rajib.Mahapatra at amd.com>
Sent: Thursday, August 26, 2021 2:07 PM
To: Wentland, Harry <Harry.Wentland at amd.com>; Kazlauskas, Nicholas <Nicholas.Kazlauskas at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Wu, Hersen <hersenxs.wu at amd.com>
Cc: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>; Mahapatra, Rajib <Rajib.Mahapatra at amd.com>
Subject: [PATCH] drm/amd/display: Set the domain as GTT when VRAM size <= 32 MB

[Why]
In lower carve out (<= 32 MB) devices, it was unable to pin framebuffer in
VRAM domain for some BO allocations. The device shows below error logs and
sometimes it reboots too.

amdgpu 0000:02:00.0: amdgpu: 00000000d721431c pin failed
[drm:dm_plane_helper_prepare_fb] *ERROR* Failed to pin framebuffer with error -12

[How]
Place the domain as GTT when VRAM size <= 32 MB.

Signed-off-by: Rajib Mahapatra <rajib.mahapatra at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h               |  1 +
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 +++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index dc3c6b3a00e5..d719be448eec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -236,6 +236,7 @@ extern int amdgpu_num_kcq;

 #define AMDGPU_VM_MAX_NUM_CTX                   4096
 #define AMDGPU_SG_THRESHOLD                     (256*1024*1024)
+#define AMDGPU_VRAM_MIN_THRESHOLD              (32*1024*1024)
 #define AMDGPU_DEFAULT_GTT_SIZE_MB              3072ULL /* 3GB by default */
 #define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS          3000
 #define AMDGPU_MAX_USEC_TIMEOUT                 100000  /* 100 ms */
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index e1e57e7465a7..f71391599be1 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -7106,8 +7106,16 @@ static int dm_plane_helper_prepare_fb(struct drm_plane *plane,
                 return r;
         }

-       if (plane->type != DRM_PLANE_TYPE_CURSOR)
+       if (plane->type != DRM_PLANE_TYPE_CURSOR) {
                 domain = amdgpu_display_supported_domains(adev, rbo->flags);
+               /*
+                * Handle devices with lower carve out.
+                */
+               if (adev->gmc.real_vram_size <= AMDGPU_VRAM_MIN_THRESHOLD) {
+                       domain |= (domain & AMDGPU_GEM_DOMAIN_GTT) ? domain :
+                                  AMDGPU_GEM_DOMAIN_GTT;
+               }
+       }
         else
                 domain = AMDGPU_GEM_DOMAIN_VRAM;

--
2.25.1

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