Re: [PATCH] drm/amdgpu: cache in more vm fault information
From: Khatri, Sunil
Date: Wed Mar 06 2024 - 08:04:55 EST
On 3/6/2024 6:12 PM, Christian König wrote:
Am 06.03.24 um 11:40 schrieb Khatri, Sunil:
On 3/6/2024 3:37 PM, Christian König wrote:
Am 06.03.24 um 10:04 schrieb Sunil Khatri:
When an page fault interrupt is raised there
is a lot more information that is useful for
developers to analyse the pagefault.
Well actually those information are not that interesting because
they are hw generation specific.
You should probably rather use the decoded strings here, e.g. hub,
client, xcc_id, node_id etc...
See gmc_v9_0_process_interrupt() an example.
I saw this v9 does provide more information than what v10 and v11
provide like node_id and fault from which die but thats again very
specific to IP_VERSION(9, 4, 3)) i dont know why thats information
is not there in v10 and v11.
I agree to your point but, as of now during a pagefault we are
dumping this information which is useful like which client
has generated an interrupt and for which src and other information
like address. So i think to provide the similar information in the
devcoredump.
Currently we do not have all this information from either job or vm
being derived from the job during a reset. We surely could add more
relevant information later on as per request but this information is
useful as
eventually its developers only who would use the dump file provided
by customer to debug.
Below is the information that i dump in devcore and i feel that is
good information but new information could be added which could be
picked later.
Page fault information
[gfxhub] page fault (src_id:0 ring:24 vmid:3 pasid:32773)
in page starting at address 0x0000000000000000 from client 0x1b (UTCL2)
This is a perfect example what I mean. You record in the patch is the
client_id, but this is is basically meaningless unless you have access
to the AMD internal hw documentation.
What you really need is the client in decoded form, in this case
UTCL2. You can keep the client_id additionally, but the decoded client
string is mandatory to have I think.
Sure i am capturing that information as i am trying to minimise the
memory interaction to minimum as we are still in interrupt context
here that why i recorded the integer information compared to decoding
and writing strings there itself but to postpone till we dump.
Like decoding to the gfxhub/mmhub based on vmhub/vmid_src and client
string from client id. So are we good to go with the information with
the above information of sharing details in devcoredump using the
additional information from pagefault cached.
regards
sunil
Regards,
Christian.
Regards
Sunil Khatri
Regards,
Christian.
Add all such information in the last cached
pagefault from an interrupt handler.
Signed-off-by: Sunil Khatri <sunil.khatri@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 9 +++++++--
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 7 ++++++-
drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 2 +-
drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c | 2 +-
drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 2 +-
drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 2 +-
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 2 +-
7 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 4299ce386322..b77e8e28769d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2905,7 +2905,7 @@ void amdgpu_debugfs_vm_bo_info(struct
amdgpu_vm *vm, struct seq_file *m)
* Cache the fault info for later use by userspace in debugging.
*/
void amdgpu_vm_update_fault_cache(struct amdgpu_device *adev,
- unsigned int pasid,
+ struct amdgpu_iv_entry *entry,
uint64_t addr,
uint32_t status,
unsigned int vmhub)
@@ -2915,7 +2915,7 @@ void amdgpu_vm_update_fault_cache(struct
amdgpu_device *adev,
xa_lock_irqsave(&adev->vm_manager.pasids, flags);
- vm = xa_load(&adev->vm_manager.pasids, pasid);
+ vm = xa_load(&adev->vm_manager.pasids, entry->pasid);
/* Don't update the fault cache if status is 0. In the multiple
* fault case, subsequent faults will return a 0 status which is
* useless for userspace and replaces the useful fault
status, so
@@ -2924,6 +2924,11 @@ void amdgpu_vm_update_fault_cache(struct
amdgpu_device *adev,
if (vm && status) {
vm->fault_info.addr = addr;
vm->fault_info.status = status;
+ vm->fault_info.client_id = entry->client_id;
+ vm->fault_info.src_id = entry->src_id;
+ vm->fault_info.vmid = entry->vmid;
+ vm->fault_info.pasid = entry->pasid;
+ vm->fault_info.ring_id = entry->ring_id;
if (AMDGPU_IS_GFXHUB(vmhub)) {
vm->fault_info.vmhub = AMDGPU_VMHUB_TYPE_GFX;
vm->fault_info.vmhub |=
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 047ec1930d12..c7782a89bdb5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -286,6 +286,11 @@ struct amdgpu_vm_fault_info {
uint32_t status;
/* which vmhub? gfxhub, mmhub, etc. */
unsigned int vmhub;
+ unsigned int client_id;
+ unsigned int src_id;
+ unsigned int ring_id;
+ unsigned int pasid;
+ unsigned int vmid;
};
struct amdgpu_vm {
@@ -605,7 +610,7 @@ static inline void
amdgpu_vm_eviction_unlock(struct amdgpu_vm *vm)
}
void amdgpu_vm_update_fault_cache(struct amdgpu_device *adev,
- unsigned int pasid,
+ struct amdgpu_iv_entry *entry,
uint64_t addr,
uint32_t status,
unsigned int vmhub);
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index d933e19e0cf5..6b177ce8db0e 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -150,7 +150,7 @@ static int gmc_v10_0_process_interrupt(struct
amdgpu_device *adev,
status = RREG32(hub->vm_l2_pro_fault_status);
WREG32_P(hub->vm_l2_pro_fault_cntl, 1, ~1);
- amdgpu_vm_update_fault_cache(adev, entry->pasid, addr,
status,
+ amdgpu_vm_update_fault_cache(adev, entry, addr, status,
entry->vmid_src ? AMDGPU_MMHUB0(0) :
AMDGPU_GFXHUB(0));
}
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
index 527dc917e049..bcf254856a3e 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
@@ -121,7 +121,7 @@ static int gmc_v11_0_process_interrupt(struct
amdgpu_device *adev,
status = RREG32(hub->vm_l2_pro_fault_status);
WREG32_P(hub->vm_l2_pro_fault_cntl, 1, ~1);
- amdgpu_vm_update_fault_cache(adev, entry->pasid, addr,
status,
+ amdgpu_vm_update_fault_cache(adev, entry, addr, status,
entry->vmid_src ? AMDGPU_MMHUB0(0) :
AMDGPU_GFXHUB(0));
}
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
index 3da7b6a2b00d..e9517ebbe1fd 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
@@ -1270,7 +1270,7 @@ static int gmc_v7_0_process_interrupt(struct
amdgpu_device *adev,
if (!addr && !status)
return 0;
- amdgpu_vm_update_fault_cache(adev, entry->pasid,
+ amdgpu_vm_update_fault_cache(adev, entry,
((u64)addr) << AMDGPU_GPU_PAGE_SHIFT,
status, AMDGPU_GFXHUB(0));
if (amdgpu_vm_fault_stop == AMDGPU_VM_FAULT_STOP_FIRST)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index d20e5f20ee31..a271bf832312 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -1438,7 +1438,7 @@ static int gmc_v8_0_process_interrupt(struct
amdgpu_device *adev,
if (!addr && !status)
return 0;
- amdgpu_vm_update_fault_cache(adev, entry->pasid,
+ amdgpu_vm_update_fault_cache(adev, entry,
((u64)addr) << AMDGPU_GPU_PAGE_SHIFT,
status, AMDGPU_GFXHUB(0));
if (amdgpu_vm_fault_stop == AMDGPU_VM_FAULT_STOP_FIRST)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 47b63a4ce68b..dc9fb1fb9540 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -666,7 +666,7 @@ static int gmc_v9_0_process_interrupt(struct
amdgpu_device *adev,
rw = REG_GET_FIELD(status, VM_L2_PROTECTION_FAULT_STATUS, RW);
WREG32_P(hub->vm_l2_pro_fault_cntl, 1, ~1);
- amdgpu_vm_update_fault_cache(adev, entry->pasid, addr,
status, vmhub);
+ amdgpu_vm_update_fault_cache(adev, entry, addr, status, vmhub);
dev_err(adev->dev,
"VM_L2_PROTECTION_FAULT_STATUS:0x%08X\n",