The root cause is that we don't wait after calling amdgpu_vm_clear_bo in amdgpu_vm_alloc_pts.
Waiting for the page table BOs to be idle for CPU page table updates is done in amdgpu_vm_bo_update_mapping. That is now *before* the page tables are actually allocated and cleared in amdgpu_vm_update_ptes. We'll need to move the waiting for page tables to be idle into amdgpu_vm_alloc_pts or amdgpu_vm_update_ptes. Regards, Felix On 2019-03-12 3:02 p.m., Felix Kuehling wrote: > I find that it's related to CPU page table updates. If I force page > table updates with SDMA, I don't get the VM fault. > > Regards, > Felix > > On 2019-03-11 12:55 p.m., Christian König wrote: >> Hi guys, >> >> well it's most likely some missing handling in the KFD, so I'm rather >> reluctant to revert the change immediately. >> >> Problem is that I don't have time right now to look into it >> immediately. So Kent can you continue to take a look? >> >> Sounds like its crashing immediately, so it should be something obvious. >> >> Christian. >> >> Am 11.03.19 um 10:49 schrieb Russell, Kent: >>> From what I've been able to dig through, the VM Fault seems to >>> occur right after a doorbell mmap, but that's as far as I got. I can >>> try to revert it in today's merge and see how things go. >>> >>> Kent >>> >>>> -----Original Message----- >>>> From: Kuehling, Felix >>>> Sent: Friday, March 08, 2019 11:16 PM >>>> To: Koenig, Christian <christian.koe...@amd.com>; Russell, Kent >>>> <kent.russ...@amd.com>; amd-gfx@lists.freedesktop.org >>>> Subject: RE: [PATCH 3/6] drm/amdgpu: allocate VM PDs/PTs on demand >>>> >>>> My concerns were related to eviction fence handing. It would >>>> manifest by >>>> unnecessary eviction callbacks into KFD that aren't cause by real >>>> evictions. I >>>> addressed that with a previous patch series that removed the need to >>>> remove eviction fences and add them back around page table updates in >>>> amdgpu_amdkfd_gpuvm.c. >>>> >>>> I don't know what's going on here. I can probably take a look on >>>> Monday. I >>>> haven't considered what changed with respect to PD updates. >>>> >>>> Kent, can we temporarily revert the offending change in >>>> amd-kfd-staging >>>> just to unblock the merge? >>>> >>>> Christian, I think KFD is currently broken on amd-staging-drm-next. >>>> If we're >>>> serious about supporting KFD upstream, you may also want to consider >>>> reverting your change there for now. Also consider building the >>>> Thunk and >>>> kfdtest so you can do quick smoke tests locally whenever you make >>>> amdgpu_vm changes that can affect KFD. >>>> https://github.com/RadeonOpenCompute/ROCT-Thunk-Interface >>>> >>>> Regards, >>>> Felix >>>> >>>> -----Original Message----- >>>> From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> On Behalf Of >>>> Christian König >>>> Sent: Friday, March 08, 2019 9:14 AM >>>> To: Russell, Kent <kent.russ...@amd.com>; >>>> amd-gfx@lists.freedesktop.org >>>> Subject: Re: [PATCH 3/6] drm/amdgpu: allocate VM PDs/PTs on demand >>>> >>>> My best guess is that we forget somewhere to update the PDs. What >>>> hardware is that on? >>>> >>>> Felix already mentioned that this could be problematic for the KFD. >>>> >>>> Maybe he has an idea, >>>> Christian. >>>> >>>> Am 08.03.19 um 15:04 schrieb Russell, Kent: >>>>> Hi Christian, >>>>> >>>>> This patch ended up causing a VM Fault in KFDTest. Reverting just >>>>> this >>>> patch addressed the issue: >>>>> [ 82.703503] amdgpu 0000:0c:00.0: GPU fault detected: 146 >>>>> 0x0000480c for >>>> process pid 0 thread pid 0 >>>>> [ 82.703512] amdgpu 0000:0c:00.0: >>>> VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x00001000 >>>>> [ 82.703516] amdgpu 0000:0c:00.0: >>>> VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x1004800C >>>>> [ 82.703522] amdgpu 0000:0c:00.0: VM fault (0x0c, vmid 8, pasid >>>>> 32769) at >>>> page 4096, read from 'TC0' (0x54433000) (72) >>>>> [ 82.703585] Evicting PASID 32769 queues >>>>> >>>>> I am looking into it, but if you have any insight that would be >>>>> great in >>>> helping to resolve it quickly. >>>>> Kent >>>>>> -----Original Message----- >>>>>> From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> On Behalf Of >>>>>> Christian König >>>>>> Sent: Tuesday, February 26, 2019 7:47 AM >>>>>> To: amd-gfx@lists.freedesktop.org >>>>>> Subject: [PATCH 3/6] drm/amdgpu: allocate VM PDs/PTs on demand >>>>>> >>>>>> Let's start to allocate VM PDs/PTs on demand instead of >>>>>> pre-allocating them during mapping. >>>>>> >>>>>> Signed-off-by: Christian König <christian.koe...@amd.com> >>>>>> Reviewed-by: Felix Kuehling <felix.kuehl...@amd.com> >>>>>> --- >>>>>> .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 10 +- >>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c | 9 -- >>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 10 -- >>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 136 >>>>>> +++++------------ >>>> - >>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 3 - >>>>>> 5 files changed, 39 insertions(+), 129 deletions(-) >>>>>> >>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c >>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c >>>>>> index 31e3953dcb6e..088e9b6b765b 100644 >>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c >>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c >>>>>> @@ -410,15 +410,7 @@ static int add_bo_to_vm(struct amdgpu_device >>>>>> *adev, struct kgd_mem *mem, >>>>>> if (p_bo_va_entry) >>>>>> *p_bo_va_entry = bo_va_entry; >>>>>> >>>>>> - /* Allocate new page tables if needed and validate >>>>>> - * them. >>>>>> - */ >>>>>> - ret = amdgpu_vm_alloc_pts(adev, vm, va, amdgpu_bo_size(bo)); >>>>>> - if (ret) { >>>>>> - pr_err("Failed to allocate pts, err=%d\n", ret); >>>>>> - goto err_alloc_pts; >>>>>> - } >>>>>> - >>>>>> + /* Allocate validate page tables if needed */ >>>>>> ret = vm_validate_pt_pd_bos(vm); >>>>>> if (ret) { >>>>>> pr_err("validate_pt_pd_bos() failed\n"); diff --git >>>>>> a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c >>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c >>>>>> index 7e22be7ca68a..54dd02a898b9 100644 >>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c >>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c >>>>>> @@ -92,15 +92,6 @@ int amdgpu_map_static_csa(struct amdgpu_device >>>>>> *adev, struct amdgpu_vm *vm, >>>>>> return -ENOMEM; >>>>>> } >>>>>> >>>>>> - r = amdgpu_vm_alloc_pts(adev, (*bo_va)->base.vm, csa_addr, >>>>>> - size); >>>>>> - if (r) { >>>>>> - DRM_ERROR("failed to allocate pts for static CSA, >>>>>> err=%d\n", >>>>>> r); >>>>>> - amdgpu_vm_bo_rmv(adev, *bo_va); >>>>>> - ttm_eu_backoff_reservation(&ticket, &list); >>>>>> - return r; >>>>>> - } >>>>>> - >>>>>> r = amdgpu_vm_bo_map(adev, *bo_va, csa_addr, 0, size, >>>>>> AMDGPU_PTE_READABLE | >>>>>> AMDGPU_PTE_WRITEABLE | >>>>>> AMDGPU_PTE_EXECUTABLE); >>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c >>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c >>>>>> index 555285e329ed..fcaaac30e84b 100644 >>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c >>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c >>>>>> @@ -625,11 +625,6 @@ int amdgpu_gem_va_ioctl(struct drm_device >>>> *dev, >>>>>> void *data, >>>>>> >>>>>> switch (args->operation) { >>>>>> case AMDGPU_VA_OP_MAP: >>>>>> - r = amdgpu_vm_alloc_pts(adev, bo_va->base.vm, args- >>>>>>> va_address, >>>>>> - args->map_size); >>>>>> - if (r) >>>>>> - goto error_backoff; >>>>>> - >>>>>> va_flags = amdgpu_gmc_get_pte_flags(adev, args->flags); >>>>>> r = amdgpu_vm_bo_map(adev, bo_va, args->va_address, >>>>>> args->offset_in_bo, args->map_size, @@ - >>>>>> 645,11 +640,6 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, >>>> void >>>>>> *data, >>>>>> args->map_size); >>>>>> break; >>>>>> case AMDGPU_VA_OP_REPLACE: >>>>>> - r = amdgpu_vm_alloc_pts(adev, bo_va->base.vm, args- >>>>>>> va_address, >>>>>> - args->map_size); >>>>>> - if (r) >>>>>> - goto error_backoff; >>>>>> - >>>>>> va_flags = amdgpu_gmc_get_pte_flags(adev, args->flags); >>>>>> r = amdgpu_vm_bo_replace_map(adev, bo_va, args- >>>>>>> va_address, >>>>>> args->offset_in_bo, args- >>>>>>> map_size, diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c >>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c >>>>>> index 362436f4e856..dfad543fc000 100644 >>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c >>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c >>>>>> @@ -504,47 +504,6 @@ static void amdgpu_vm_pt_next(struct >>>>>> amdgpu_device *adev, >>>>>> } >>>>>> } >>>>>> >>>>>> -/** >>>>>> - * amdgpu_vm_pt_first_leaf - get first leaf PD/PT >>>>>> - * >>>>>> - * @adev: amdgpu_device pointer >>>>>> - * @vm: amdgpu_vm structure >>>>>> - * @start: start addr of the walk >>>>>> - * @cursor: state to initialize >>>>>> - * >>>>>> - * Start a walk and go directly to the leaf node. >>>>>> - */ >>>>>> -static void amdgpu_vm_pt_first_leaf(struct amdgpu_device *adev, >>>>>> - struct amdgpu_vm *vm, uint64_t start, >>>>>> - struct amdgpu_vm_pt_cursor *cursor) >>>>>> -{ >>>>>> - amdgpu_vm_pt_start(adev, vm, start, cursor); >>>>>> - while (amdgpu_vm_pt_descendant(adev, cursor)); >>>>>> -} >>>>>> - >>>>>> -/** >>>>>> - * amdgpu_vm_pt_next_leaf - get next leaf PD/PT >>>>>> - * >>>>>> - * @adev: amdgpu_device pointer >>>>>> - * @cursor: current state >>>>>> - * >>>>>> - * Walk the PD/PT tree to the next leaf node. >>>>>> - */ >>>>>> -static void amdgpu_vm_pt_next_leaf(struct amdgpu_device *adev, >>>>>> - struct amdgpu_vm_pt_cursor *cursor) >>>>>> -{ >>>>>> - amdgpu_vm_pt_next(adev, cursor); >>>>>> - if (cursor->pfn != ~0ll) >>>>>> - while (amdgpu_vm_pt_descendant(adev, cursor)); >>>>>> -} >>>>>> - >>>>>> -/** >>>>>> - * for_each_amdgpu_vm_pt_leaf - walk over all leaf PDs/PTs in the >>>>>> hierarchy >>>>>> - */ >>>>>> -#define for_each_amdgpu_vm_pt_leaf(adev, vm, start, end, cursor) >>>>>> \ >>>>>> - for (amdgpu_vm_pt_first_leaf((adev), (vm), (start), &(cursor)); >>>>>> \ >>>>>> - (cursor).pfn <= end; amdgpu_vm_pt_next_leaf((adev), >>>>>> &(cursor))) >>>>>> - >>>>>> /** >>>>>> * amdgpu_vm_pt_first_dfs - start a deep first search >>>>>> * >>>>>> @@ -915,74 +874,51 @@ static void amdgpu_vm_bo_param(struct >>>>>> amdgpu_device *adev, struct amdgpu_vm *vm, >>>>>> * Returns: >>>>>> * 0 on success, errno otherwise. >>>>>> */ >>>>>> -int amdgpu_vm_alloc_pts(struct amdgpu_device *adev, >>>>>> - struct amdgpu_vm *vm, >>>>>> - uint64_t saddr, uint64_t size) >>>>>> +static int amdgpu_vm_alloc_pts(struct amdgpu_device *adev, >>>>>> + struct amdgpu_vm *vm, >>>>>> + struct amdgpu_vm_pt_cursor *cursor) >>>>>> { >>>>>> - struct amdgpu_vm_pt_cursor cursor; >>>>>> + struct amdgpu_vm_pt *entry = cursor->entry; >>>>>> + struct amdgpu_bo_param bp; >>>>>> struct amdgpu_bo *pt; >>>>>> - uint64_t eaddr; >>>>>> int r; >>>>>> >>>>>> - /* validate the parameters */ >>>>>> - if (saddr & AMDGPU_GPU_PAGE_MASK || size & >>>>>> AMDGPU_GPU_PAGE_MASK) >>>>>> - return -EINVAL; >>>>>> + if (cursor->level < AMDGPU_VM_PTB && !entry->entries) { >>>>>> + unsigned num_entries; >>>>>> >>>>>> - eaddr = saddr + size - 1; >>>>>> - >>>>>> - saddr /= AMDGPU_GPU_PAGE_SIZE; >>>>>> - eaddr /= AMDGPU_GPU_PAGE_SIZE; >>>>>> - >>>>>> - if (eaddr >= adev->vm_manager.max_pfn) { >>>>>> - dev_err(adev->dev, "va above limit (0x%08llX >= >>>>>> 0x%08llX)\n", >>>>>> - eaddr, adev->vm_manager.max_pfn); >>>>>> - return -EINVAL; >>>>>> + num_entries = amdgpu_vm_num_entries(adev, cursor- >>>>>>> level); >>>>>> + entry->entries = kvmalloc_array(num_entries, >>>>>> + sizeof(*entry->entries), >>>>>> + GFP_KERNEL | __GFP_ZERO); >>>>>> + if (!entry->entries) >>>>>> + return -ENOMEM; >>>>>> } >>>>>> >>>>>> - for_each_amdgpu_vm_pt_leaf(adev, vm, saddr, eaddr, cursor) { >>>>>> - struct amdgpu_vm_pt *entry = cursor.entry; >>>>>> - struct amdgpu_bo_param bp; >>>>>> - >>>>>> - if (cursor.level < AMDGPU_VM_PTB) { >>>>>> - unsigned num_entries; >>>>>> - >>>>>> - num_entries = amdgpu_vm_num_entries(adev, >>>>>> cursor.level); >>>>>> - entry->entries = kvmalloc_array(num_entries, >>>>>> - sizeof(*entry- >>>>>>> entries), >>>>>> - GFP_KERNEL | >>>>>> - __GFP_ZERO); >>>>>> - if (!entry->entries) >>>>>> - return -ENOMEM; >>>>>> - } >>>>>> - >>>>>> - >>>>>> - if (entry->base.bo) >>>>>> - continue; >>>>>> - >>>>>> - amdgpu_vm_bo_param(adev, vm, cursor.level, &bp); >>>>>> - >>>>>> - r = amdgpu_bo_create(adev, &bp, &pt); >>>>>> - if (r) >>>>>> - return r; >>>>>> - >>>>>> - if (vm->use_cpu_for_update) { >>>>>> - r = amdgpu_bo_kmap(pt, NULL); >>>>>> - if (r) >>>>>> - goto error_free_pt; >>>>>> - } >>>>>> + if (entry->base.bo) >>>>>> + return 0; >>>>>> >>>>>> - /* Keep a reference to the root directory to avoid >>>>>> - * freeing them up in the wrong order. >>>>>> - */ >>>>>> - pt->parent = amdgpu_bo_ref(cursor.parent->base.bo); >>>>>> + amdgpu_vm_bo_param(adev, vm, cursor->level, &bp); >>>>>> >>>>>> - amdgpu_vm_bo_base_init(&entry->base, vm, pt); >>>>>> + r = amdgpu_bo_create(adev, &bp, &pt); >>>>>> + if (r) >>>>>> + return r; >>>>>> >>>>>> - r = amdgpu_vm_clear_bo(adev, vm, pt); >>>>>> + if (vm->use_cpu_for_update) { >>>>>> + r = amdgpu_bo_kmap(pt, NULL); >>>>>> if (r) >>>>>> goto error_free_pt; >>>>>> } >>>>>> >>>>>> + /* Keep a reference to the root directory to avoid >>>>>> + * freeing them up in the wrong order. >>>>>> + */ >>>>>> + pt->parent = amdgpu_bo_ref(cursor->parent->base.bo); >>>>>> + amdgpu_vm_bo_base_init(&entry->base, vm, pt); >>>>>> + >>>>>> + r = amdgpu_vm_clear_bo(adev, vm, pt); >>>>>> + if (r) >>>>>> + goto error_free_pt; >>>>>> + >>>>>> return 0; >>>>>> >>>>>> error_free_pt: >>>>>> @@ -1627,6 +1563,7 @@ static int amdgpu_vm_update_ptes(struct >>>>>> amdgpu_pte_update_params *params, >>>>>> struct amdgpu_vm_pt_cursor cursor; >>>>>> uint64_t frag_start = start, frag_end; >>>>>> unsigned int frag; >>>>>> + int r; >>>>>> >>>>>> /* figure out the initial fragment */ >>>>>> amdgpu_vm_fragment(params, frag_start, end, flags, &frag, >>>>>> &frag_end); @@ -1634,12 +1571,15 @@ static int >>>>>> amdgpu_vm_update_ptes(struct amdgpu_pte_update_params *params, >>>>>> /* walk over the address space and update the PTs */ >>>>>> amdgpu_vm_pt_start(adev, params->vm, start, &cursor); >>>>>> while (cursor.pfn < end) { >>>>>> - struct amdgpu_bo *pt = cursor.entry->base.bo; >>>>>> unsigned shift, parent_shift, mask; >>>>>> uint64_t incr, entry_end, pe_start; >>>>>> + struct amdgpu_bo *pt; >>>>>> >>>>>> - if (!pt) >>>>>> - return -ENOENT; >>>>>> + r = amdgpu_vm_alloc_pts(params->adev, params->vm, >>>>>> &cursor); >>>>>> + if (r) >>>>>> + return r; >>>>>> + >>>>>> + pt = cursor.entry->base.bo; >>>>>> >>>>>> /* The root level can't be a huge page */ >>>>>> if (cursor.level == adev->vm_manager.root_level) { >>>>>> diff --git >>>>>> a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h >>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h >>>>>> index 81ff8177f092..116605c038d2 100644 >>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h >>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h >>>>>> @@ -303,9 +303,6 @@ bool amdgpu_vm_ready(struct amdgpu_vm *vm); >>>> int >>>>>> amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct >>>>>> amdgpu_vm *vm, >>>>>> int (*callback)(void *p, struct amdgpu_bo *bo), >>>>>> void *param); >>>>>> -int amdgpu_vm_alloc_pts(struct amdgpu_device *adev, >>>>>> - struct amdgpu_vm *vm, >>>>>> - uint64_t saddr, uint64_t size); >>>>>> int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job >>>>>> *job, bool need_pipe_sync); int amdgpu_vm_update_directories(struct >>>>>> amdgpu_device *adev, >>>>>> struct amdgpu_vm *vm); >>>>>> -- >>>>>> 2.17.1 >>>>>> >>>>>> _______________________________________________ >>>>>> amd-gfx mailing list >>>>>> amd-gfx@lists.freedesktop.org >>>>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx >>>> _______________________________________________ >>>> amd-gfx mailing list >>>> amd-gfx@lists.freedesktop.org >>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx >>> _______________________________________________ >>> amd-gfx mailing list >>> amd-gfx@lists.freedesktop.org >>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx >> _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
