On 2021-06-11 12:51 a.m., Alex Sierra
wrote:
should take svms lock[Why] Avoid duplicated memory allocation for address ranges that have been already allocated by either ioctl_alloc_memory_of_gpu or SVM mechanisms first. [How] For SVM first allocations Check if the address range passed into ioctl memory alloc does not exist already in the kfd_process svms->objects interval tree. For ioctl_alloc_memory_of_gpu first 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 | 11 +++++ drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 63 ++++++++++++++++++------ 2 files changed, 59 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c index 5788a4656fa1..0cfa685d9b8a 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c @@ -1259,6 +1259,17 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep, if (args->size == 0) return -EINVAL; +#if IS_ENABLED(CONFIG_HSA_AMD_SVM) + struct svm_range_list *svms = &p->svms; +
+ if (interval_tree_iter_first(&svms->objects,
+ args->va_addr >> PAGE_SHIFT,
+ (args->va_addr + args->size - 1) >> PAGE_SHIFT)) {
+ pr_info("Address: 0x%llx already allocated by SVM\n",
+ args->va_addr);
+ return -EADDRINUSE;
+ }
+#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 0f18bd0dc64e..883a9659cf8e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -2485,9 +2485,40 @@ 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
+ * traditional kfd_ioctl_alloc_memory_of_gpu ioctl.
+ * It looks for each pdd in the kfd_process.
+ *
+ * Context: Process context
+ *
+ * Return true only if range has been mapped
+ */
+static bool
+svm_range_is_vm_bo_mapped(struct kfd_process *p, uint64_t start, uint64_t last)
+{
+ uint32_t i;
+
+ for (i = 0; i < p->n_pdds; i++) {
+ struct amdgpu_vm *vm = drm_priv_to_vm(p->pdds[i]->drm_priv);
+
take vm root page table bo lock
+ if (vm && interval_tree_iter_first(&vm->va, start, last)) {
+ pr_debug("Range [0x%llx 0x%llx] already mapped\n", start, last);
+ return true;
+ }
+ }
+
+ return false;
+}
+
/**
* 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
*
@@ -2496,28 +2527,28 @@ 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)
svm_range_is_vm_bo_mapped returns bool, this should return bool, or
change svm_range_is_vm_bo_mapped to return int error code. Regards, Philip
{
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) ?
+ -EADDRINUSE:0;
}
/**
@@ -2826,9 +2857,9 @@ 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;
}
@@ -2929,15 +2960,17 @@ 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");
+ r = svm_range_is_valid(p, start, size);
+ if (r) {
+ pr_debug("invalid range r=%d\n", r);
mmap_read_unlock(mm);
- return -EINVAL;
+ return r;
}
mmap_read_unlock(mm);
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