[PATCH] drm/amdgpu: set sub_block_index for mca ras sub-blocks

[Yunxiang Li]

The mca ras sub-blocks (mp0, mp1, mpio) all share the
AMDGPU_RAS_BLOCK__MCA block id and are distinguished only by
sub_block_index. The ras manager object for an mca block is selected
with:

        con->objs[AMDGPU_RAS_BLOCK__LAST + head->sub_block_index]

Since the rework in commit 7f544c5488cf ("drm/amdgpu: Rework mca ras
sw_init") moved the ras_comm setup into amdgpu_mca_mp*_ras_sw_init() but
left sub_block_index unset, mp0/mp1/mpio all default to index 0 and
collide on the same object slot. mp0 grabs the slot and creates its
sysfs node first; mp1 (and mpio) then find the slot already in use, so
amdgpu_ras_block_late_init() -> amdgpu_ras_sysfs_create() returns
-EINVAL:

  amdgpu: mca.mp1 failed to execute ras_block_late_init_default! ret:-22
  amdgpu: amdgpu_ras_late_init failed -22
  amdgpu: amdgpu_device_ip_late_init failed
  amdgpu: Fatal error during GPU init

The error is currently masked because amdgpu_ras_late_init() does not
check the return value of amdgpu_ras_block_late_init_default(), but it
already leaves mp1/mpio without their sysfs nodes and becomes a fatal
init failure as soon as that return value is honored.

Restore the per-sub-block sub_block_index assignment so each mca
sub-block maps to its own object slot.

Fixes: 7f544c5488cf ("drm/amdgpu: Rework mca ras sw_init")
Signed-off-by: Yunxiang Li <yunxiang...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
index 3ca03b5e0f913..e1e4a61b1301c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
@@ -99,6 +99,7 @@ int amdgpu_mca_mp0_ras_sw_init(struct amdgpu_device *adev)
 
        strcpy(ras->ras_block.ras_comm.name, "mca.mp0");
        ras->ras_block.ras_comm.block = AMDGPU_RAS_BLOCK__MCA;
+       ras->ras_block.ras_comm.sub_block_index = AMDGPU_RAS_MCA_BLOCK__MP0;
        ras->ras_block.ras_comm.type = AMDGPU_RAS_ERROR__MULTI_UNCORRECTABLE;
        adev->mca.mp0.ras_if = &ras->ras_block.ras_comm;
 
@@ -123,6 +124,7 @@ int amdgpu_mca_mp1_ras_sw_init(struct amdgpu_device *adev)
 
        strcpy(ras->ras_block.ras_comm.name, "mca.mp1");
        ras->ras_block.ras_comm.block = AMDGPU_RAS_BLOCK__MCA;
+       ras->ras_block.ras_comm.sub_block_index = AMDGPU_RAS_MCA_BLOCK__MP1;
        ras->ras_block.ras_comm.type = AMDGPU_RAS_ERROR__MULTI_UNCORRECTABLE;
        adev->mca.mp1.ras_if = &ras->ras_block.ras_comm;
 
@@ -147,6 +149,7 @@ int amdgpu_mca_mpio_ras_sw_init(struct amdgpu_device *adev)
 
        strcpy(ras->ras_block.ras_comm.name, "mca.mpio");
        ras->ras_block.ras_comm.block = AMDGPU_RAS_BLOCK__MCA;
+       ras->ras_block.ras_comm.sub_block_index = AMDGPU_RAS_MCA_BLOCK__MPIO;
        ras->ras_block.ras_comm.type = AMDGPU_RAS_ERROR__MULTI_UNCORRECTABLE;
        adev->mca.mpio.ras_if = &ras->ras_block.ras_comm;
 
-- 
2.51.2