[PATCH 57/64] drivers/gpu: use mm locking wrappers

From: Davidlohr Bueso
Date: Sun Feb 04 2018 - 20:31:07 EST

From: Davidlohr Bueso <dave@xxxxxxxxxxxx>

This becomes quite straightforward with the mmrange in place.
Those mmap_sem users that don't know about mmrange are updated
trivially as the sem is used in the same context of the caller.

Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 7 ++++---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 8 ++++----
drivers/gpu/drm/amd/amdkfd/kfd_events.c | 5 +++--
drivers/gpu/drm/i915/i915_gem.c | 5 +++--
drivers/gpu/drm/i915/i915_gem_userptr.c | 9 +++++----
drivers/gpu/drm/radeon/radeon_cs.c | 5 +++--
drivers/gpu/drm/radeon/radeon_gem.c | 7 ++++---
drivers/gpu/drm/radeon/radeon_mn.c | 7 ++++---
drivers/gpu/drm/ttm/ttm_bo_vm.c | 4 ++--
9 files changed, 32 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index bd67f4cb8e6c..cda7ea8503b7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -257,9 +257,10 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
struct mm_struct *mm = current->mm;
struct amdgpu_mn *rmn;
int r;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

mutex_lock(&adev->mn_lock);
- if (down_write_killable(&mm->mmap_sem)) {
+ if (mm_write_lock_killable(mm, &mmrange)) {
mutex_unlock(&adev->mn_lock);
return ERR_PTR(-EINTR);
}
@@ -289,13 +290,13 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
hash_add(adev->mn_hash, &rmn->node, (unsigned long)mm);

release_locks:
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
mutex_unlock(&adev->mn_lock);

return rmn;

free_rmn:
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
mutex_unlock(&adev->mn_lock);
kfree(rmn);

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index bd464a599341..95467ef0df45 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -696,7 +696,7 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY))
flags |= FOLL_WRITE;

- down_read(&current->mm->mmap_sem);
+ mm_read_lock(current->mm, &mmrange);

if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
/* check that we only use anonymous memory
@@ -706,7 +706,7 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)

vma = find_vma(gtt->usermm, gtt->userptr);
if (!vma || vma->vm_file || vma->vm_end < end) {
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
return -EPERM;
}
}
@@ -735,12 +735,12 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)

} while (pinned < ttm->num_pages);

- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
return 0;

release_pages:
release_pages(pages, pinned);
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
return r;
}

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index 93aae5c1e78b..ca516482b145 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -851,6 +851,7 @@ void kfd_signal_iommu_event(struct kfd_dev *dev, unsigned int pasid,
*/
struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
struct mm_struct *mm;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

if (!p)
return; /* Presumably process exited. */
@@ -866,7 +867,7 @@ void kfd_signal_iommu_event(struct kfd_dev *dev, unsigned int pasid,

memset(&memory_exception_data, 0, sizeof(memory_exception_data));

- down_read(&mm->mmap_sem);
+ mm_read_lock(mm, &mmrange);
vma = find_vma(mm, address);

memory_exception_data.gpu_id = dev->id;
@@ -893,7 +894,7 @@ void kfd_signal_iommu_event(struct kfd_dev *dev, unsigned int pasid,
}
}

- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
mmput(mm);

mutex_lock(&p->event_mutex);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dd89abd2263d..61d958934efd 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1758,8 +1758,9 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
if (args->flags & I915_MMAP_WC) {
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

- if (down_write_killable(&mm->mmap_sem)) {
+ if (mm_write_lock_killable(mm, &mmrange)) {
i915_gem_object_put(obj);
return -EINTR;
}
@@ -1769,7 +1770,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
else
addr = -ENOMEM;
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);

/* This may race, but that's ok, it only gets set */
WRITE_ONCE(obj->frontbuffer_ggtt_origin, ORIGIN_CPU);
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 881bcc7d663a..3886b74638f7 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -205,6 +205,7 @@ i915_mmu_notifier_find(struct i915_mm_struct *mm)
{
struct i915_mmu_notifier *mn;
int err = 0;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

mn = mm->mn;
if (mn)
@@ -214,7 +215,7 @@ i915_mmu_notifier_find(struct i915_mm_struct *mm)
if (IS_ERR(mn))
err = PTR_ERR(mn);

- down_write(&mm->mm->mmap_sem);
+ mm_write_lock(mm->mm, &mmrange);
mutex_lock(&mm->i915->mm_lock);
if (mm->mn == NULL && !err) {
/* Protected by mmap_sem (write-lock) */
@@ -231,7 +232,7 @@ i915_mmu_notifier_find(struct i915_mm_struct *mm)
err = 0;
}
mutex_unlock(&mm->i915->mm_lock);
- up_write(&mm->mm->mmap_sem);
+ mm_write_unlock(mm->mm, &mmrange);

if (mn && !IS_ERR(mn)) {
destroy_workqueue(mn->wq);
@@ -514,7 +515,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
if (mmget_not_zero(mm)) {
DEFINE_RANGE_LOCK_FULL(mmrange);

- down_read(&mm->mmap_sem);
+ mm_read_lock(mm, &mmrange);
while (pinned < npages) {
ret = get_user_pages_remote
(work->task, mm,
@@ -527,7 +528,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)

pinned += ret;
}
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
mmput(mm);
}
}
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index 1ae31dbc61c6..71a19881b04a 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -79,6 +79,7 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
unsigned i;
bool need_mmap_lock = false;
int r;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

if (p->chunk_relocs == NULL) {
return 0;
@@ -190,12 +191,12 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
p->vm_bos = radeon_vm_get_bos(p->rdev, p->ib.vm,
&p->validated);
if (need_mmap_lock)
- down_read(&current->mm->mmap_sem);
+ mm_read_lock(current->mm, &mmrange);

r = radeon_bo_list_validate(p->rdev, &p->ticket, &p->validated, p->ring);

if (need_mmap_lock)
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);

return r;
}
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index a9962ffba720..3e169fa1750e 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -292,6 +292,7 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void *data,
struct radeon_bo *bo;
uint32_t handle;
int r;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

if (offset_in_page(args->addr | args->size))
return -EINVAL;
@@ -336,17 +337,17 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void *data,
}

if (args->flags & RADEON_GEM_USERPTR_VALIDATE) {
- down_read(&current->mm->mmap_sem);
+ mm_read_lock(current->mm, &mmrange);
r = radeon_bo_reserve(bo, true);
if (r) {
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
goto release_object;
}

radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_GTT);
r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
radeon_bo_unreserve(bo);
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
if (r)
goto release_object;
}
diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
index abd24975c9b1..9b10cacc5b14 100644
--- a/drivers/gpu/drm/radeon/radeon_mn.c
+++ b/drivers/gpu/drm/radeon/radeon_mn.c
@@ -186,8 +186,9 @@ static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
struct mm_struct *mm = current->mm;
struct radeon_mn *rmn;
int r;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

- if (down_write_killable(&mm->mmap_sem))
+ if (mm_write_lock_killable(mm, &mmrange))
return ERR_PTR(-EINTR);

mutex_lock(&rdev->mn_lock);
@@ -216,13 +217,13 @@ static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)

release_locks:
mutex_unlock(&rdev->mn_lock);
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);

return rmn;

free_rmn:
mutex_unlock(&rdev->mn_lock);
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
kfree(rmn);

return ERR_PTR(r);
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 08a3c324242e..2b2a1668fbe3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -67,7 +67,7 @@ static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
goto out_unlock;

ttm_bo_reference(bo);
- up_read(&vmf->vma->vm_mm->mmap_sem);
+ mm_read_unlock(vmf->vma->vm_mm, vmf->lockrange);
(void) dma_fence_wait(bo->moving, true);
ttm_bo_unreserve(bo);
ttm_bo_unref(&bo);
@@ -137,7 +137,7 @@ static int ttm_bo_vm_fault(struct vm_fault *vmf)
if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
ttm_bo_reference(bo);
- up_read(&vmf->vma->vm_mm->mmap_sem);
+ mm_read_unlock(vmf->vma->vm_mm, vmf->lockrange);
(void) ttm_bo_wait_unreserved(bo);
ttm_bo_unref(&bo);
}
--
2.13.6