[Intel-gfx] [PATCH 6/7] drm/i915: Add module param for enabling TTM in sysmem region

[Adrian Larumbe]

Introduces a new module parameter, 'use_pool_alloc', which defaults to
'false'. Its goal is to make the driver fall back on TTM for setting up
the system memory region, so that object allocation will be done through
the TTM subsystem rather than shmem objects.

This commit only brings in the new kernel module param, which will be
used by successive commits.

Signed-off-by: Adrian Larumbe <adrian.larumbe at collabora.com>
---
 drivers/gpu/drm/i915/i915_params.c | 6 ++++++
 drivers/gpu/drm/i915/i915_params.h | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 6fc475a5db61..1af11f030ab1 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -207,6 +207,12 @@ i915_param_named_unsafe(lmem_size, uint, 0400,
 i915_param_named_unsafe(lmem_bar_size, uint, 0400,
 			"Set the lmem bar size(in MiB).");
 
+i915_param_named_unsafe(use_pool_alloc, bool, 0600,
+	"Force the driver to use TTM's pool allocator API for smem objects. "
+	"This will cause TTM to take over BO allocation even in integrated platforms. "
+	"(default: false)");
+
+
 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 2733cb6cfe09..992ee2a4947d 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -84,7 +84,8 @@ struct drm_printer;
 	param(bool, verbose_state_checks, true, 0) \
 	param(bool, nuclear_pageflip, false, 0400) \
 	param(bool, enable_dp_mst, true, 0600) \
-	param(bool, enable_gvt, false, IS_ENABLED(CONFIG_DRM_I915_GVT) ? 0400 : 0)
+	param(bool, enable_gvt, false, IS_ENABLED(CONFIG_DRM_I915_GVT) ? 0400 : 0) \
+	param(bool, use_pool_alloc, false, 0600)
 
 #define MEMBER(T, member, ...) T member;
 struct i915_params {
-- 
2.37.0