diff options
Diffstat (limited to 'drivers/gpu/drm/drm_gpusvm.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gpusvm.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_gpusvm.c b/drivers/gpu/drm/drm_gpusvm.c index 735bfdf4322f..ab198645d90f 100644 --- a/drivers/gpu/drm/drm_gpusvm.c +++ b/drivers/gpu/drm/drm_gpusvm.c @@ -7,6 +7,7 @@ */ #include <linux/dma-mapping.h> +#include <linux/export.h> #include <linux/hmm.h> #include <linux/memremap.h> #include <linux/migrate.h> @@ -981,6 +982,40 @@ static void drm_gpusvm_driver_lock_held(struct drm_gpusvm *gpusvm) #endif /** + * drm_gpusvm_find_vma_start() - Find start address for first VMA in range + * @gpusvm: Pointer to the GPU SVM structure + * @start: The inclusive start user address. + * @end: The exclusive end user address. + * + * Returns: The start address of first VMA within the provided range, + * ULONG_MAX otherwise. Assumes start_addr < end_addr. + */ +unsigned long +drm_gpusvm_find_vma_start(struct drm_gpusvm *gpusvm, + unsigned long start, + unsigned long end) +{ + struct mm_struct *mm = gpusvm->mm; + struct vm_area_struct *vma; + unsigned long addr = ULONG_MAX; + + if (!mmget_not_zero(mm)) + return addr; + + mmap_read_lock(mm); + + vma = find_vma_intersection(mm, start, end); + if (vma) + addr = vma->vm_start; + + mmap_read_unlock(mm); + mmput(mm); + + return addr; +} +EXPORT_SYMBOL_GPL(drm_gpusvm_find_vma_start); + +/** * drm_gpusvm_range_find_or_insert() - Find or insert GPU SVM range * @gpusvm: Pointer to the GPU SVM structure * @fault_addr: Fault address |