[PATCH 1/2] drm/amdkfd: Move TLB flushing logic into amdgpu
Felix Kuehling
Felix.Kuehling at amd.com
Fri Feb 24 23:36:46 UTC 2023
This will make it possible for amdgpu GEM ioctls to flush TLBs on compute
VMs.
This removes VMID-based TLB flushing and always uses PASID-based
flushing. This still works because it scans the VMID-PASID mapping
registers to find the right VMID. It's only slightly less efficient. This
is not a production use case.
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 30 +++++++++-------------
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 6 ++---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 1 +
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 9 +++++--
drivers/gpu/drm/amd/amdkfd/kfd_process.c | 28 --------------------
5 files changed, 22 insertions(+), 52 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
index 8816853e50c0..dcbd28e99b5c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
@@ -726,31 +726,25 @@ bool amdgpu_amdkfd_is_kfd_vmid(struct amdgpu_device *adev, u32 vmid)
return false;
}
-int amdgpu_amdkfd_flush_gpu_tlb_vmid(struct amdgpu_device *adev,
- uint16_t vmid)
-{
- if (adev->family == AMDGPU_FAMILY_AI) {
- int i;
-
- for (i = 0; i < adev->num_vmhubs; i++)
- amdgpu_gmc_flush_gpu_tlb(adev, vmid, i, 0);
- } else {
- amdgpu_gmc_flush_gpu_tlb(adev, vmid, AMDGPU_GFXHUB_0, 0);
- }
-
- return 0;
-}
-
-int amdgpu_amdkfd_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
- uint16_t pasid, enum TLB_FLUSH_TYPE flush_type)
+int amdgpu_amdkfd_flush_tlb(struct amdgpu_device *adev, struct amdgpu_vm *vm,
+ enum TLB_FLUSH_TYPE type)
{
+ uint64_t tlb_seq = amdgpu_vm_tlb_seq(vm);
bool all_hub = false;
+ /*
+ * It can be that we race and lose here, but that is extremely unlikely
+ * and the worst thing which could happen is that we flush the changes
+ * into the TLB once more which is harmless.
+ */
+ if (atomic64_xchg(&vm->kfd_last_flushed_seq, tlb_seq) == tlb_seq)
+ return 0;
+
if (adev->family == AMDGPU_FAMILY_AI ||
adev->family == AMDGPU_FAMILY_RV)
all_hub = true;
- return amdgpu_gmc_flush_gpu_tlb_pasid(adev, pasid, flush_type, all_hub);
+ return amdgpu_gmc_flush_gpu_tlb_pasid(adev, vm->pasid, type, all_hub);
}
bool amdgpu_amdkfd_have_atomics_support(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index 01ba3589b60a..dcaf69fd833c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -157,10 +157,8 @@ int amdgpu_amdkfd_submit_ib(struct amdgpu_device *adev,
uint32_t *ib_cmd, uint32_t ib_len);
void amdgpu_amdkfd_set_compute_idle(struct amdgpu_device *adev, bool idle);
bool amdgpu_amdkfd_have_atomics_support(struct amdgpu_device *adev);
-int amdgpu_amdkfd_flush_gpu_tlb_vmid(struct amdgpu_device *adev,
- uint16_t vmid);
-int amdgpu_amdkfd_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
- uint16_t pasid, enum TLB_FLUSH_TYPE flush_type);
+int amdgpu_amdkfd_flush_tlb(struct amdgpu_device *adev, struct amdgpu_vm *vm,
+ enum TLB_FLUSH_TYPE type);
bool amdgpu_amdkfd_is_kfd_vmid(struct amdgpu_device *adev, u32 vmid);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 03a3314e5b43..171de7da2959 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -290,6 +290,7 @@ struct amdgpu_vm {
/* Last finished delayed update */
atomic64_t tlb_seq;
struct dma_fence *last_tlb_flush;
+ atomic64_t kfd_last_flushed_seq;
/* Last unlocked submission to the scheduler entities */
struct dma_fence *last_unlocked;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index bfa30d12406b..e029129308e7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -715,7 +715,6 @@ struct kfd_process_device {
/* VM context for GPUVM allocations */
struct file *drm_file;
void *drm_priv;
- atomic64_t tlb_seq;
/* GPUVM allocations storage */
struct idr alloc_idr;
@@ -1344,7 +1343,13 @@ void kfd_signal_reset_event(struct kfd_dev *dev);
void kfd_signal_poison_consumed_event(struct kfd_dev *dev, u32 pasid);
-void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type);
+static inline void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type)
+{
+ struct amdgpu_device *adev = pdd->dev->adev;
+ struct amdgpu_vm *vm = drm_priv_to_vm(pdd->drm_priv);
+
+ amdgpu_amdkfd_flush_tlb(adev, vm, type);
+}
static inline bool kfd_flush_tlb_after_unmap(struct kfd_dev *dev)
{
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index ebabe92f7edb..48d7d30eeb24 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -1591,7 +1591,6 @@ int kfd_process_device_init_vm(struct kfd_process_device *pdd,
return ret;
}
pdd->drm_priv = drm_file->private_data;
- atomic64_set(&pdd->tlb_seq, 0);
ret = kfd_process_device_reserve_ib_mem(pdd);
if (ret)
@@ -1994,33 +1993,6 @@ int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct kfd_process *process,
KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
}
-void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type)
-{
- struct amdgpu_vm *vm = drm_priv_to_vm(pdd->drm_priv);
- uint64_t tlb_seq = amdgpu_vm_tlb_seq(vm);
- struct kfd_dev *dev = pdd->dev;
-
- /*
- * It can be that we race and lose here, but that is extremely unlikely
- * and the worst thing which could happen is that we flush the changes
- * into the TLB once more which is harmless.
- */
- if (atomic64_xchg(&pdd->tlb_seq, tlb_seq) == tlb_seq)
- return;
-
- if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
- /* Nothing to flush until a VMID is assigned, which
- * only happens when the first queue is created.
- */
- if (pdd->qpd.vmid)
- amdgpu_amdkfd_flush_gpu_tlb_vmid(dev->adev,
- pdd->qpd.vmid);
- } else {
- amdgpu_amdkfd_flush_gpu_tlb_pasid(dev->adev,
- pdd->process->pasid, type);
- }
-}
-
struct kfd_process_device *kfd_process_device_data_by_id(struct kfd_process *p, uint32_t gpu_id)
{
int i;
--
2.34.1
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