[PATCH v3 30/30] drm/xe: Add always_migrate_to_vram modparam

[Matthew Brost]

Used to show we can bounce memory multiple times which will happen once
a real migration policy is implemented. Can be removed once migration
policy is implemented.

v3:
 - Pull some changes into the previous patch (Thomas)
 - Spell out power of 2 (Thomas)
 - Better commit message (Thomas)

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

diff --git a/drivers/gpu/drm/xe/xe_module.c b/drivers/gpu/drm/xe/xe_module.c
index 2126e99ede01..192047b3419b 100644
--- a/drivers/gpu/drm/xe/xe_module.c
+++ b/drivers/gpu/drm/xe/xe_module.c
@@ -30,7 +30,10 @@ struct xe_modparam xe_modparam = {
 };
 
 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_PARM_DESC(svm_notifier_size, "Set the svm notifier size(in MiB), must be power of 2");
+
+module_param_named(always_migrate_to_vram, xe_modparam.always_migrate_to_vram, bool, 0444);
+MODULE_PARM_DESC(always_migrate_to_vram, "Always migrate to VRAM on GPU fault");
 
 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 5a3bfea8b7b4..84339e509c80 100644
--- a/drivers/gpu/drm/xe/xe_module.h
+++ b/drivers/gpu/drm/xe/xe_module.h
@@ -12,6 +12,7 @@
 struct xe_modparam {
 	bool force_execlist;
 	bool probe_display;
+	bool always_migrate_to_vram;
 	u32 force_vram_bar_size;
 	int guc_log_level;
 	char *guc_firmware_path;
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 9586c711386f..cc5998903469 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -823,6 +823,9 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
 	}
 	drm_exec_fini(&exec);
 
+	if (xe_modparam.always_migrate_to_vram)
+		range->migrated = false;
+
 	dma_fence_wait(fence, false);
 	dma_fence_put(fence);
 
-- 
2.34.1