[PATCH v4 32/33] 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.br...@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 f291b2eb2073..a96b0afc0e31 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -821,6 +821,9 @@ 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