[RFC PATCH 131/162] drm/i915/dg1: Add enable_eviction modparam

[Matthew Auld]

From: CQ Tang <cq.tang at intel.com>

enable_eviction is used to tune if eviction is enabled (default) or not.

Signed-off-by: Sudeep Dutt <sudeep.dutt at intel.com>
Signed-off-by: CQ Tang <cq.tang at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.c | 1 +
 drivers/gpu/drm/i915/gem/i915_gem_region.c | 5 +++++
 drivers/gpu/drm/i915/i915_params.c         | 3 +++
 drivers/gpu/drm/i915/i915_params.h         | 1 +
 drivers/gpu/drm/i915/intel_memory_region.c | 2 +-
 5 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 7cb5f137522f..46d0f8731db0 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -293,6 +293,7 @@ static void i915_gem_free_object(struct drm_gem_object *gem_obj)
 	 * If object had been swapped out, free the hidden object.
 	 */
 	if (obj->swapto) {
+		GEM_BUG_ON(!i915->params.enable_eviction);
 		i915_gem_object_put(obj->swapto);
 		obj->swapto = NULL;
 	}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_region.c b/drivers/gpu/drm/i915/gem/i915_gem_region.c
index a437538cd872..e1793c5f8d8c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_region.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_region.c
@@ -21,6 +21,7 @@ i915_gem_object_swapout_pages(struct drm_i915_gem_object *obj,
 	GEM_BUG_ON(i915_gem_object_has_pages(obj));
 	GEM_BUG_ON(obj->mm.madv != I915_MADV_WILLNEED);
 	GEM_BUG_ON(obj->mm.region->type != INTEL_MEMORY_LOCAL);
+	GEM_BUG_ON(!i915->params.enable_eviction);
 
 	assert_object_held(obj);
 
@@ -70,6 +71,7 @@ static int
 i915_gem_object_swapin_pages(struct drm_i915_gem_object *obj,
 			     struct sg_table *pages, unsigned int sizes)
 {
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 	struct drm_i915_gem_object *dst, *src;
 	int err;
 
@@ -77,6 +79,7 @@ i915_gem_object_swapin_pages(struct drm_i915_gem_object *obj,
 	GEM_BUG_ON(i915_gem_object_has_pages(obj));
 	GEM_BUG_ON(obj->mm.madv != I915_MADV_WILLNEED);
 	GEM_BUG_ON(obj->mm.region->type != INTEL_MEMORY_LOCAL);
+	GEM_BUG_ON(!i915->params.enable_eviction);
 
 	assert_object_held(obj);
 
@@ -146,6 +149,7 @@ i915_gem_object_put_pages_buddy(struct drm_i915_gem_object *obj,
 int
 i915_gem_object_get_pages_buddy(struct drm_i915_gem_object *obj)
 {
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 	struct intel_memory_region *mem = obj->mm.region;
 	struct list_head *blocks = &obj->mm.blocks;
 	resource_size_t size = obj->base.size;
@@ -222,6 +226,7 @@ i915_gem_object_get_pages_buddy(struct drm_i915_gem_object *obj)
 	/* if we saved the page contents, swap them in */
 	if (obj->swapto) {
 		GEM_BUG_ON(i915_gem_object_is_volatile(obj));
+		GEM_BUG_ON(!i915->params.enable_eviction);
 
 		ret = i915_gem_object_swapin_pages(obj, st,
 						   sg_page_sizes);
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 7f139ea4a90b..bb1ebb6ece95 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -197,6 +197,9 @@ i915_param_named_unsafe(fake_lmem_start, ulong, 0400,
 	"Fake LMEM start offset (default: 0)");
 #endif
 
+i915_param_named_unsafe(enable_eviction, bool, 0600,
+	"Enable memcpy based eviction which does not rely on DMA resv refactoring)");
+
 static __always_inline void _print_param(struct drm_printer *p,
 					 const char *name,
 					 const char *type,
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 330c03e2b4f7..87df407d9afb 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -72,6 +72,7 @@ struct drm_printer;
 	param(char *, force_probe, CONFIG_DRM_I915_FORCE_PROBE, 0400) \
 	param(unsigned long, fake_lmem_start, 0, 0400) \
 	/* leave bools at the end to not create holes */ \
+	param(bool, enable_eviction, true, 0600) \
 	param(bool, enable_hangcheck, true, 0600) \
 	param(bool, load_detect_test, false, 0600) \
 	param(bool, force_reset_modeset_test, false, 0600) \
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index afcd6fe6eaff..57f01ef16628 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -175,7 +175,7 @@ static int intel_memory_region_evict(struct intel_memory_region *mem,
 	list_splice_tail(&still_in_list, *phase);
 	mutex_unlock(&mem->objects.lock);
 
-	if (found < target) {
+	if (found < target && i915->params.enable_eviction) {
 		pass++;
 		phase++;
 		if (*phase)
-- 
2.26.2