[PATCH v4 01/33] drm/xe: Retry BO allocation

[Matthew Brost <matthew.brost@intel.com>]

TTM doesn't support fair eviction via WW locking, this mitigated in by
using retry loops in exec and preempt rebind worker. Extend this retry
loop to BO allocation. Once TTM supports fair eviction this patch can be
reverted.

v4:
 - Keep line break (Stuart)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
---
 drivers/gpu/drm/xe/xe_bo.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index c32201123d44..fb1629d9d566 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -2162,6 +2162,7 @@ int xe_gem_create_ioctl(struct drm_device *dev, void *data,
 	struct xe_file *xef = to_xe_file(file);
 	struct drm_xe_gem_create *args = data;
 	struct xe_vm *vm = NULL;
+	ktime_t end = 0;
 	struct xe_bo *bo;
 	unsigned int bo_flags;
 	u32 handle;
@@ -2234,6 +2235,10 @@ int xe_gem_create_ioctl(struct drm_device *dev, void *data,
 		vm = xe_vm_lookup(xef, args->vm_id);
 		if (XE_IOCTL_DBG(xe, !vm))
 			return -ENOENT;
+	}
+
+retry:
+	if (vm) {
 		err = xe_vm_lock(vm, true);
 		if (err)
 			goto out_vm;
@@ -2247,6 +2252,8 @@ int xe_gem_create_ioctl(struct drm_device *dev, void *data,
 
 	if (IS_ERR(bo)) {
 		err = PTR_ERR(bo);
+		if (xe_vm_validate_should_retry(NULL, err, &end))
+			goto retry;
 		goto out_vm;
 	}
 
-- 
2.34.1