[Why]
Avoid conflict with address ranges mapped by SVM
mechanism that try to be allocated again through
ioctl_alloc in the same process. And viceversa.
[How]
For ioctl_alloc_memory_of_gpu allocations
Check if the address range passed into ioctl memory
alloc does not exist already in the kfd_process
svms->objects interval tree.
For SVM allocations
Look for the address range into the interval tree VA from
the VM inside of each pdds used in a kfd_process.
Signed-off-by: Alex Sierra <alex.sierra@xxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 13 ++++
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 79
+++++++++++++++++++-----
2 files changed, 75 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 67541c30327a..f39baaa22a62 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1251,6 +1251,7 @@ static int
kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
struct kfd_process_device *pdd;
void *mem;
struct kfd_dev *dev;
+ struct svm_range_list *svms = &p->svms;
int idr_handle;
long err;
uint64_t offset = args->mmap_offset;
@@ -1259,6 +1260,18 @@ static int
kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
if (args->size == 0)
return -EINVAL;
+#if IS_ENABLED(CONFIG_HSA_AMD_SVM)
+ mutex_lock(&svms->lock);
+ if (interval_tree_iter_first(&svms->objects,
+ args->va_addr >> PAGE_SHIFT,
+ (args->va_addr + args->size -
1) >> PAGE_SHIFT)) {
+ pr_err("Address: 0x%llx already allocated by SVM\n",
+ args->va_addr);
+ mutex_unlock(&svms->lock);
+ return -EADDRINUSE;
+ }
+ mutex_unlock(&svms->lock);
+#endif
dev = kfd_device_by_id(args->gpu_id);
if (!dev)
return -EINVAL;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 31f3f24cef6a..043ee0467916 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -2581,9 +2581,54 @@ int svm_range_list_init(struct kfd_process *p)
return 0;
}
+/**
+ * svm_range_is_vm_bo_mapped - check if virtual address range
mapped already
+ * @p: current kfd_process
+ * @start: range start address, in pages
+ * @last: range last address, in pages
+ *
+ * The purpose is to avoid virtual address ranges already allocated by
+ * kfd_ioctl_alloc_memory_of_gpu ioctl.
+ * It looks for each pdd in the kfd_process.
+ *
+ * Context: Process context
+ *
+ * Return 0 - OK, if the range is not mapped.
+ * Otherwise error code:
+ * -EADDRINUSE - if address is mapped already by
kfd_ioctl_alloc_memory_of_gpu
+ * -ERESTARTSYS - A wait for the buffer to become unreserved was
interrupted by
+ * a signal. Release all buffer reservations and return to user-space.
+ */
+static int
+svm_range_is_vm_bo_mapped(struct kfd_process *p, uint64_t start,
uint64_t last)
+{
+ uint32_t i;
+ int r;
+
+ for (i = 0; i < p->n_pdds; i++) {
+ struct amdgpu_vm *vm;
+
+ if (!p->pdds[i]->drm_priv)
+ continue;
+
+ vm = drm_priv_to_vm(p->pdds[i]->drm_priv);
+ r = amdgpu_bo_reserve(vm->root.bo, false);
+ if (r)
+ return r;
+ if (interval_tree_iter_first(&vm->va, start, last)) {
+ pr_debug("Range [0x%llx 0x%llx] already
mapped\n", start, last);
+ amdgpu_bo_unreserve(vm->root.bo);
+ return -EADDRINUSE;
+ }
+ amdgpu_bo_unreserve(vm->root.bo);
+ }
+
+ return 0;
+}
+
/**
* svm_range_is_valid - check if virtual address range is valid
- * @mm: current process mm_struct
+ * @mm: current kfd_process
* @start: range start address, in pages
* @size: range size, in pages
*
@@ -2592,28 +2637,27 @@ int svm_range_list_init(struct kfd_process *p)
* Context: Process context
*
* Return:
- * true - valid svm range
- * false - invalid svm range
+ * 0 - OK, otherwise error code
*/
-static bool
-svm_range_is_valid(struct mm_struct *mm, uint64_t start, uint64_t
size)
+static int
+svm_range_is_valid(struct kfd_process *p, uint64_t start, uint64_t
size)
{
const unsigned long device_vma = VM_IO | VM_PFNMAP |
VM_MIXEDMAP;
struct vm_area_struct *vma;
unsigned long end;
+ unsigned long start_unchg = start;
start <<= PAGE_SHIFT;
end = start + (size << PAGE_SHIFT);
-
do {
- vma = find_vma(mm, start);
+ vma = find_vma(p->mm, start);
if (!vma || start < vma->vm_start ||
(vma->vm_flags & device_vma))
- return false;
+ return -EFAULT;
start = min(end, vma->vm_end);
} while (start < end);
- return true;
+ return svm_range_is_vm_bo_mapped(p, start_unchg, (end - 1)
>> PAGE_SHIFT);
}
/**
@@ -2913,9 +2957,9 @@ svm_range_set_attr(struct kfd_process *p,
uint64_t start, uint64_t size,
svm_range_list_lock_and_flush_work(svms, mm);
- if (!svm_range_is_valid(mm, start, size)) {
- pr_debug("invalid range\n");
- r = -EFAULT;
+ r = svm_range_is_valid(p, start, size);
+ if (r) {
+ pr_debug("invalid range r=%d\n", r);
mmap_write_unlock(mm);
goto out;
}
@@ -3016,17 +3060,18 @@ svm_range_get_attr(struct kfd_process *p,
uint64_t start, uint64_t size,
uint32_t flags = 0xffffffff;
int gpuidx;
uint32_t i;
+ int r = 0;
pr_debug("svms 0x%p [0x%llx 0x%llx] nattr 0x%x\n",
&p->svms, start,
start + size - 1, nattr);
mmap_read_lock(mm);
- if (!svm_range_is_valid(mm, start, size)) {
- pr_debug("invalid range\n");
- mmap_read_unlock(mm);
- return -EINVAL;
- }
+ r = svm_range_is_valid(p, start, size);
mmap_read_unlock(mm);
+ if (r) {
+ pr_debug("invalid range r=%d\n", r);
+ return r;
+ }
for (i = 0; i < nattr; i++) {
switch (attrs[i].type) {
--
2.32.0
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