[PATCH 09/18] drm/i915: Add functions to allocate / release gem obj for GuC

[yu.dai@xxxxxxxxx]

From: Alex Dai <yu.dai@xxxxxxxxx>

All gem objects used by GuC are pinned to ggtt space out of range
[0, WOPCM size]. In GuC address space mapping, [0, WPOCM size] is
used internally for its Boot ROM, SRAM etc. Currently this WPOCM
size is 512K. This is done by using of PIN_OFFSET_BIAS.

Issue: VIZ-4884
Signed-off-by: Alex Dai <yu.dai@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_guc.h        |  3 +++
 drivers/gpu/drm/i915/intel_guc_loader.c | 34 +++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index d8262cf..ae14c57 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -92,5 +92,8 @@ struct intel_guc {
 extern int intel_guc_load_ucode(struct drm_device *dev, bool wait);
 extern void intel_guc_ucode_fini(struct drm_device *dev);
 extern void intel_guc_ucode_init(struct drm_device *dev);
+struct drm_i915_gem_object *
+intel_guc_allocate_gem_obj(struct drm_device *dev, u32 size);
+void intel_guc_release_gem_obj(struct drm_i915_gem_object *obj);
 
 #endif
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 315e5d9..0500a53 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -30,6 +30,40 @@
 MODULE_FIRMWARE(I915_GUC_UCODE_GEN8);
 MODULE_FIRMWARE(I915_GUC_UCODE_GEN9);
 
+struct drm_i915_gem_object *
+intel_guc_allocate_gem_obj(struct drm_device *dev, u32 size)
+{
+	struct drm_i915_gem_object *obj;
+
+	obj = i915_gem_alloc_object(dev, size);
+	if (!obj)
+		return NULL;
+
+	if (i915_gem_object_get_pages(obj)) {
+		drm_gem_object_unreference(&obj->base);
+		return NULL;
+	}
+
+	if (i915_gem_obj_ggtt_pin(obj, PAGE_SIZE,
+			PIN_OFFSET_BIAS | GUC_WOPCM_SIZE_VALUE)) {
+		drm_gem_object_unreference(&obj->base);
+		return NULL;
+	}
+
+	return obj;
+}
+
+void intel_guc_release_gem_obj(struct drm_i915_gem_object *obj)
+{
+	if (!obj)
+		return;
+
+	if (i915_gem_obj_is_pinned(obj))
+		i915_gem_object_ggtt_unpin(obj);
+
+	drm_gem_object_unreference(&obj->base);
+}
+
 static int copy_rsa(struct drm_i915_private *dev_priv)
 {
 	struct sg_table *st = dev_priv->guc.guc_fw.uc_fw_obj->pages;
-- 
1.9.1

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