[RFC PATCH 26/28] drm/xe: Add modparam for SVM notifier size

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

Useful to experiment with notifier size and how it affects performance.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_module.c | 4 ++++
 drivers/gpu/drm/xe/xe_module.h | 1 +
 drivers/gpu/drm/xe/xe_svm.c    | 5 +++--
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_module.c b/drivers/gpu/drm/xe/xe_module.c
index 923460119cec..30cfb76344a1 100644
--- a/drivers/gpu/drm/xe/xe_module.c
+++ b/drivers/gpu/drm/xe/xe_module.c
@@ -22,9 +22,13 @@ struct xe_modparam xe_modparam = {
 	.max_vfs = IS_ENABLED(CONFIG_DRM_XE_DEBUG) ? ~0 : 0,
 #endif
 	.wedged_mode = 1,
+	.svm_notifier_size = 512,
 	/* the rest are 0 by default */
 };
 
+module_param_named(svm_notifier_size, xe_modparam.svm_notifier_size, uint, 0600);
+MODULE_PARM_DESC(svm_notifier_size, "Set the svm notifier size(in MiB), must be pow2");
+
 module_param_named_unsafe(force_execlist, xe_modparam.force_execlist, bool, 0444);
 MODULE_PARM_DESC(force_execlist, "Force Execlist submission");
 
diff --git a/drivers/gpu/drm/xe/xe_module.h b/drivers/gpu/drm/xe/xe_module.h
index 161a5e6f717f..5a3bfea8b7b4 100644
--- a/drivers/gpu/drm/xe/xe_module.h
+++ b/drivers/gpu/drm/xe/xe_module.h
@@ -22,6 +22,7 @@ struct xe_modparam {
 	unsigned int max_vfs;
 #endif
 	int wedged_mode;
+	u32 svm_notifier_size;
 };
 
 extern struct xe_modparam xe_modparam;
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index f9c2bffd1783..5e2ec25c3cb2 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -8,6 +8,7 @@
 #include "xe_bo.h"
 #include "xe_gt_tlb_invalidation.h"
 #include "xe_migrate.h"
+#include "xe_module.h"
 #include "xe_pt.h"
 #include "xe_svm.h"
 #include "xe_ttm_vram_mgr.h"
@@ -543,8 +544,8 @@ int xe_svm_init(struct xe_vm *vm)
 
 	return drm_gpusvm_init(&vm->svm.gpusvm, "Xe SVM", &vm->xe->drm,
 			       current->mm, xe_svm_devm_owner(vm->xe), 0,
-			       vm->size, SZ_512M, &gpusvm_ops,
-			       fault_chunk_sizes,
+			       vm->size, xe_modparam.svm_notifier_size * SZ_1M,
+			       &gpusvm_ops, fault_chunk_sizes,
 			       ARRAY_SIZE(fault_chunk_sizes));
 }
 
-- 
2.34.1