[PATCH v4 3/5] drm/xe/svm: Extend MAP range to reduce vma fragmentation

[Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>]

When DRM_XE_VM_BIND_FLAG_CPU_ADDR_MIRROR is set during VM_BIND_OP_MAP,
the mapping logic now checks adjacent cpu_addr_mirror VMAs with default
attributes and expands the mapping range accordingly. This ensures that
bo_unmap operations ideally target the same area and helps reduce
fragmentation by coalescing nearby compatible VMAs into a single mapping.

Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 944eb35bb2b8..d78eb95a954f 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2231,6 +2231,7 @@ vm_bind_ioctl_ops_create(struct xe_vm *vm, struct xe_vma_ops *vops,
 	struct drm_gpuva_ops *ops;
 	struct drm_gpuva_op *__op;
 	struct drm_gpuvm_bo *vm_bo;
+	u64 range_start = addr;
 	u64 range_end = addr + range;
 	int err;
 
@@ -2243,10 +2244,14 @@ vm_bind_ioctl_ops_create(struct xe_vm *vm, struct xe_vma_ops *vops,
 
 	switch (operation) {
 	case DRM_XE_VM_BIND_OP_MAP:
+		if (flags & DRM_XE_VM_BIND_FLAG_CPU_ADDR_MIRROR)
+			xe_vm_find_cpu_addr_mirror_vma_range(vm, &range_start, &range_end);
+
+		fallthrough;
 	case DRM_XE_VM_BIND_OP_MAP_USERPTR: {
 		struct drm_gpuvm_map_req map_req = {
-			.map.va.addr = addr,
-			.map.va.range = range,
+			.map.va.addr = range_start,
+			.map.va.range = range_end - range_start,
 			.map.gem.obj = obj,
 			.map.gem.offset = bo_offset_or_userptr,
 		};
-- 
2.34.1