Am 2022-06-07 um 13:17 schrieb Alex Sierra:
[WHY]
Unified memory with xnack off should be tracked, as userptr mappings
and legacy allocations do. To avoid oversuscribe system memory when
xnack off.
[How]
Exposing functions reserve_mem_limit and unreserve_mem_limit to SVM
API and call them on every prange creation and free.
Signed-off-by: Alex Sierra <alex.sierra@xxxxxxx>
I'm finding some more problems (see inline). It makes me wonder whether
there is a good way to test this. We may need to expose the mem limits
in debugfs so we can check for leaks.
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 4 ++
.../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 27 ++++++-----
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 47 +++++++++++++------
3 files changed, 51 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index f8b9f27adcf5..f55f34af6480 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -301,6 +301,10 @@ bool amdgpu_amdkfd_bo_mapped_to_dev(struct amdgpu_device *adev, struct kgd_mem *
void amdgpu_amdkfd_block_mmu_notifications(void *p);
int amdgpu_amdkfd_criu_resume(void *p);
bool amdgpu_amdkfd_ras_query_utcl2_poison_status(struct amdgpu_device *adev);
+int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
+ uint64_t size, u32 alloc_flag);
+void amdgpu_amdkfd_unreserve_mem_limit(struct amdgpu_device *adev,
+ uint64_t size, u32 alloc_flag);
#if IS_ENABLED(CONFIG_HSA_AMD)
void amdgpu_amdkfd_gpuvm_init_mem_limits(void);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 50730d2132a6..f13977ae4579 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -122,7 +122,7 @@ void amdgpu_amdkfd_reserve_system_mem(uint64_t size)
*
* Return: returns -ENOMEM in case of error, ZERO otherwise
*/
-static int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
+int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
uint64_t size, u32 alloc_flag)
{
uint64_t reserved_for_pt =
@@ -157,8 +157,8 @@ static int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
kfd_mem_limit.max_system_mem_limit && !no_system_mem_limit) ||
(kfd_mem_limit.ttm_mem_used + ttm_mem_needed >
kfd_mem_limit.max_ttm_mem_limit) ||
- (adev->kfd.vram_used + vram_needed >
- adev->gmc.real_vram_size - reserved_for_pt)) {
+ (adev && (adev->kfd.vram_used + vram_needed >
+ adev->gmc.real_vram_size - reserved_for_pt))) {
The extra pair of parentheses you added around the a > b is unnecessary.
ret = -ENOMEM;
goto release;
}
@@ -166,7 +166,10 @@ static int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
/* Update memory accounting by decreasing available system
* memory, TTM memory and GPU memory as computed above
*/
- adev->kfd.vram_used += vram_needed;
+ WARN_ONCE(vram_needed && !adev,
+ "adev reference can't be null when vram is used");
+ if (adev)
+ adev->kfd.vram_used += vram_needed;
kfd_mem_limit.system_mem_used += system_mem_needed;
kfd_mem_limit.ttm_mem_used += ttm_mem_needed;
@@ -175,7 +178,7 @@ static int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
return ret;
}
-static void unreserve_mem_limit(struct amdgpu_device *adev,
+void amdgpu_amdkfd_unreserve_mem_limit(struct amdgpu_device *adev,
uint64_t size, u32 alloc_flag)
{
spin_lock(&kfd_mem_limit.mem_limit_lock);
@@ -184,7 +187,10 @@ static void unreserve_mem_limit(struct amdgpu_device *adev,
kfd_mem_limit.system_mem_used -= size;
kfd_mem_limit.ttm_mem_used -= size;
} else if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
- adev->kfd.vram_used -= size;
+ WARN_ONCE(!adev,
+ "adev reference can't be null when alloc mem flags vram is set");
+ if (adev)
+ adev->kfd.vram_used -= size;
} else if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) {
kfd_mem_limit.system_mem_used -= size;
} else if (!(alloc_flag &
@@ -193,11 +199,8 @@ static void unreserve_mem_limit(struct amdgpu_device *adev,
pr_err("%s: Invalid BO type %#x\n", __func__, alloc_flag);
goto release;
}
-
- WARN_ONCE(adev->kfd.vram_used < 0,
+ WARN_ONCE(adev && adev->kfd.vram_used < 0,
"KFD VRAM memory accounting unbalanced");
- WARN_ONCE(kfd_mem_limit.ttm_mem_used < 0,
- "KFD TTM memory accounting unbalanced");
WARN_ONCE(kfd_mem_limit.system_mem_used < 0,
"KFD system memory accounting unbalanced");
@@ -211,7 +214,7 @@ void amdgpu_amdkfd_release_notify(struct amdgpu_bo *bo)
u32 alloc_flags = bo->kfd_bo->alloc_flags;
u64 size = amdgpu_bo_size(bo);
- unreserve_mem_limit(adev, size, alloc_flags);
+ amdgpu_amdkfd_unreserve_mem_limit(adev, size, alloc_flags);
kfree(bo->kfd_bo);
}
@@ -1601,7 +1604,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
/* Don't unreserve system mem limit twice */
goto err_reserve_limit;
err_bo_create:
- unreserve_mem_limit(adev, size, flags);
+ amdgpu_amdkfd_unreserve_mem_limit(adev, size, flags);
err_reserve_limit:
mutex_destroy(&(*mem)->lock);
if (gobj)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index d6fc00d51c8c..329b10d1709b 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -259,13 +259,22 @@ void svm_range_free_dma_mappings(struct svm_range *prange)
}
}
-static void svm_range_free(struct svm_range *prange)
+static void svm_range_free(struct svm_range *prange, bool skip_unreserve)
{
+ uint64_t size = (prange->last - prange->start + 1) << PAGE_SHIFT;
+ struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms);
+
pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, prange,
prange->start, prange->last);
svm_range_vram_node_free(prange);
svm_range_free_dma_mappings(prange);
+
+ if (!skip_unreserve && !p->xnack_enabled) {
+ pr_debug("unreserve mem limit: %lld\n", size);
+ amdgpu_amdkfd_unreserve_mem_limit(NULL, size,
+ KFD_IOC_ALLOC_MEM_FLAGS_USERPTR);
+ }
mutex_destroy(&prange->lock);
mutex_destroy(&prange->migrate_mutex);
kfree(prange);
@@ -284,7 +293,7 @@ svm_range_set_default_attributes(int32_t *location, int32_t *prefetch_loc,
static struct
svm_range *svm_range_new(struct svm_range_list *svms, uint64_t start,
- uint64_t last)
+ uint64_t last, bool is_new_alloc)
{
uint64_t size = last - start + 1;
struct svm_range *prange;
@@ -293,6 +302,15 @@ svm_range *svm_range_new(struct svm_range_list *svms, uint64_t start,
prange = kzalloc(sizeof(*prange), GFP_KERNEL);
if (!prange)
return NULL;
+
+ p = container_of(svms, struct kfd_process, svms);
+ if (!p->xnack_enabled && is_new_alloc &&
+ amdgpu_amdkfd_reserve_mem_limit(NULL, size << PAGE_SHIFT,
+ KFD_IOC_ALLOC_MEM_FLAGS_USERPTR)) {
+ pr_info("SVM mapping failed, exceeds resident system memory limit\n");
+ kfree(prange);
+ return NULL;
+ }
prange->npages = size;
prange->svms = svms;
prange->start = start;
@@ -307,7 +325,6 @@ svm_range *svm_range_new(struct svm_range_list *svms, uint64_t start,
mutex_init(&prange->migrate_mutex);
mutex_init(&prange->lock);
- p = container_of(svms, struct kfd_process, svms);
if (p->xnack_enabled)
bitmap_copy(prange->bitmap_access, svms->bitmap_supported,
MAX_GPU_INSTANCE);
@@ -1000,9 +1017,9 @@ svm_range_split(struct svm_range *prange, uint64_t start, uint64_t last,
svms = prange->svms;
if (old_start == start)
- *new = svm_range_new(svms, last + 1, old_last);
+ *new = svm_range_new(svms, last + 1, old_last, false);
else
- *new = svm_range_new(svms, old_start, start - 1);
+ *new = svm_range_new(svms, old_start, start - 1, false);
if (!*new)
return -ENOMEM;
@@ -1010,7 +1027,7 @@ svm_range_split(struct svm_range *prange, uint64_t start, uint64_t last,
if (r) {
pr_debug("failed %d split [0x%llx 0x%llx] to [0x%llx 0x%llx]\n",
r, old_start, old_last, start, last);
- svm_range_free(*new);
+ svm_range_free(*new, false);
This should be skip_unreserve=true because the range you're freeing was
created without reserving space.
*new = NULL;
}
@@ -1825,7 +1842,7 @@ static struct svm_range *svm_range_clone(struct svm_range *old)
{
struct svm_range *new;
- new = svm_range_new(old->svms, old->start, old->last);
+ new = svm_range_new(old->svms, old->start, old->last, false);
if (!new)
return NULL;
@@ -1951,7 +1968,7 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
/* insert a new node if needed */
if (node->start > start) {
- prange = svm_range_new(svms, start, node->start - 1);
+ prange = svm_range_new(svms, start, node->start - 1, true);
if (!prange) {
r = -ENOMEM;
goto out;
@@ -1967,7 +1984,7 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
/* add a final range at the end if needed */
if (start <= last) {
- prange = svm_range_new(svms, start, last);
+ prange = svm_range_new(svms, start, last, true);
if (!prange) {
r = -ENOMEM;
goto out;
@@ -1979,7 +1996,7 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
out:
if (r)
list_for_each_entry_safe(prange, tmp, insert_list, list)
- svm_range_free(prange);
+ svm_range_free(prange, false);
OK, so maybe we do need a flag here after all, because we need to
unreserve space for ranges that were newly inserted (under the comment
/* insert a new node if needed */), but skip unreserving space for
ranges that were cloned from existing ones.
Or we need a separate new_list for real new ranges, that gets spliced
into the insert_list in the success case, and freed with unreserve in
the failure case.
Regards,
Felix
return r;
}
@@ -2026,7 +2043,7 @@ svm_range_handle_list_op(struct svm_range_list *svms, struct svm_range *prange,
svms, prange, prange->start, prange->last);
svm_range_unlink(prange);
svm_range_remove_notifier(prange);
- svm_range_free(prange);
+ svm_range_free(prange, false);
break;
case SVM_OP_UPDATE_RANGE_NOTIFIER:
pr_debug("update notifier 0x%p prange 0x%p [0x%lx 0x%lx]\n",
@@ -2588,14 +2605,14 @@ svm_range *svm_range_create_unregistered_range(struct amdgpu_device *adev,
last = addr;
}
- prange = svm_range_new(&p->svms, start, last);
+ prange = svm_range_new(&p->svms, start, last, true);
if (!prange) {
pr_debug("Failed to create prange in address [0x%llx]\n", addr);
return NULL;
}
if (kfd_process_gpuid_from_adev(p, adev, &gpuid, &gpuidx)) {
pr_debug("failed to get gpuid from kgd\n");
- svm_range_free(prange);
+ svm_range_free(prange, false);
return NULL;
}
@@ -2884,7 +2901,7 @@ void svm_range_list_fini(struct kfd_process *p)
list_for_each_entry_safe(prange, next, &p->svms.list, list) {
svm_range_unlink(prange);
svm_range_remove_notifier(prange);
- svm_range_free(prange);
+ svm_range_free(prange, false);
}
mutex_destroy(&p->svms.lock);
@@ -3299,7 +3316,7 @@ svm_range_set_attr(struct kfd_process *p, struct mm_struct *mm,
prange->last);
svm_range_unlink(prange);
svm_range_remove_notifier(prange);
- svm_range_free(prange);
+ svm_range_free(prange, true);
}
mmap_write_downgrade(mm);
