diff options
| author | Yong Zhao <Yong.Zhao@amd.com> | 2019-09-25 23:57:30 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-10-03 09:11:04 -0500 |
| commit | 56fc40aba4d9bc22ccbb8ce88a1c41f666d04f05 (patch) | |
| tree | 5047bac876d499703715286c831c39f2420c0784 /drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c | |
| parent | 3fe023d42ea82be7d32ad26ab9409d970c1d361f (diff) | |
drm/amdkfd: Eliminate get_atc_vmid_pasid_mapping_valid
get_atc_vmid_pasid_mapping_valid() is very similar to
get_atc_vmid_pasid_mapping_pasid(), so they can be merged into a new
function get_atc_vmid_pasid_mapping_info() to reduce register access
times. More importantly, getting the PASID and the valid bit atomically
with a single read fixes some potential race conditions where the
mapping changes between the two reads.
Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c index 177d1e5329a5..9f59ba93cfe0 100644 --- a/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c +++ b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c @@ -33,7 +33,9 @@ static bool cik_event_interrupt_isr(struct kfd_dev *dev, const struct cik_ih_ring_entry *ihre = (const struct cik_ih_ring_entry *)ih_ring_entry; const struct kfd2kgd_calls *f2g = dev->kfd2kgd; - unsigned int vmid, pasid; + unsigned int vmid; + uint16_t pasid; + bool ret; /* This workaround is due to HW/FW limitation on Hawaii that * VMID and PASID are not written into ih_ring_entry @@ -48,13 +50,13 @@ static bool cik_event_interrupt_isr(struct kfd_dev *dev, *tmp_ihre = *ihre; vmid = f2g->read_vmid_from_vmfault_reg(dev->kgd); - pasid = f2g->get_atc_vmid_pasid_mapping_pasid(dev->kgd, vmid); + ret = f2g->get_atc_vmid_pasid_mapping_info(dev->kgd, vmid, &pasid); tmp_ihre->ring_id &= 0x000000ff; tmp_ihre->ring_id |= vmid << 8; tmp_ihre->ring_id |= pasid << 16; - return (pasid != 0) && + return ret && (pasid != 0) && vmid >= dev->vm_info.first_vmid_kfd && vmid <= dev->vm_info.last_vmid_kfd; } |