[PATCH v5 7/9] drm/i915/gvt: define weight according to vGPU type

[Ping Gao]

The weight define proportional control of the vGPU resource between
vGPUs, different vGPU types has different fixed weight definition.
If different type vGPUs been created at the same time, the vGPU
resource ratio between them is equal with ratio of weight.

v4: rebase on the fixed vGPU type
v5: rebase on the newest code and add inline comments for weight.

Signed-off-by: Ping Gao <ping.a.gao at intel.com>
---
 drivers/gpu/drm/i915/gvt/gvt.h          |  4 ++++
 drivers/gpu/drm/i915/gvt/kvmgt.c        |  6 ++++--
 drivers/gpu/drm/i915/gvt/sched_policy.c |  1 +
 drivers/gpu/drm/i915/gvt/vgpu.c         | 21 ++++++++++++++++-----
 4 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 563ed22..0f53f5d 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -151,6 +151,7 @@ struct intel_vgpu {
 	bool failsafe;
 	bool resetting;
 	void *sched_data;
+	struct intel_sched_ctl sched_ctl;
 
 	struct intel_vgpu_fence fence;
 	struct intel_vgpu_gm gm;
@@ -221,6 +222,7 @@ struct intel_vgpu_type {
 	unsigned int low_gm_size;
 	unsigned int high_gm_size;
 	unsigned int fence;
+	unsigned int weight;
 	enum intel_vgpu_edid resolution;
 };
 
@@ -330,6 +332,8 @@ struct intel_vgpu_creation_params {
 	__u64 resolution;
 	__s32 primary;
 	__u64 vgpu_id;
+
+	__u32 weight;
 };
 
 int intel_vgpu_alloc_resource(struct intel_vgpu *vgpu,
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 84d8016..55be2f2 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -295,10 +295,12 @@ static ssize_t description_show(struct kobject *kobj, struct device *dev,
 		return 0;
 
 	return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
-		       "fence: %d\nresolution: %s\n",
+		       "fence: %d\nresolution: %s\n"
+		       "weight: %d\n",
 		       BYTES_TO_MB(type->low_gm_size),
 		       BYTES_TO_MB(type->high_gm_size),
-		       type->fence, vgpu_edid_str(type->resolution));
+		       type->fence, vgpu_edid_str(type->resolution),
+		       type->weight);
 }
 
 static MDEV_TYPE_ATTR_RO(available_instances);
diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index e0311c8..8fd1fa3 100644
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -340,6 +340,7 @@ static int tbs_sched_init_vgpu(struct intel_vgpu *vgpu)
 	if (!data)
 		return -ENOMEM;
 
+	data->sched_ctl.weight = vgpu->sched_ctl.weight;
 	data->vgpu = vgpu;
 	INIT_LIST_HEAD(&data->list);
 	INIT_LIST_HEAD(&data->lru_list);
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index 150c26d..3e652e2 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -68,14 +68,21 @@ static struct {
 	unsigned int low_mm;
 	unsigned int high_mm;
 	unsigned int fence;
+
+	/* A vGPU with a weight of 8 will get twice as much GPU
+	 * as a vGPU with a weight of 4 on a contended host. Legal
+	 * weights range from 1 to 65535 and different vGPU type
+	 * has different weight set.
+	 */
+	unsigned int weight;
 	enum intel_vgpu_edid edid;
 	char *name;
 } vgpu_types[] = {
 /* Fixed vGPU type table */
-	{ MB_TO_BYTES(64), MB_TO_BYTES(512), 4, GVT_EDID_1024_768, "8" },
-	{ MB_TO_BYTES(128), MB_TO_BYTES(512), 4, GVT_EDID_1920_1200, "4" },
-	{ MB_TO_BYTES(256), MB_TO_BYTES(1024), 4, GVT_EDID_1920_1200, "2" },
-	{ MB_TO_BYTES(512), MB_TO_BYTES(2048), 4, GVT_EDID_1920_1200, "1" },
+	{ MB_TO_BYTES(64), MB_TO_BYTES(512), 4, 1, GVT_EDID_1024_768, "8" },
+	{ MB_TO_BYTES(128), MB_TO_BYTES(512), 4, 2, GVT_EDID_1920_1200, "4" },
+	{ MB_TO_BYTES(256), MB_TO_BYTES(1024), 4, 4, GVT_EDID_1920_1200, "2" },
+	{ MB_TO_BYTES(512), MB_TO_BYTES(2048), 4, 8, GVT_EDID_1920_1200, "1" },
 };
 
 /**
@@ -120,6 +127,7 @@ int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
 		gvt->types[i].low_gm_size = vgpu_types[i].low_mm;
 		gvt->types[i].high_gm_size = vgpu_types[i].high_mm;
 		gvt->types[i].fence = vgpu_types[i].fence;
+		gvt->types[i].weight = vgpu_types[i].weight;
 		gvt->types[i].resolution = vgpu_types[i].edid;
 		gvt->types[i].avail_instance = min(low_avail / vgpu_types[i].low_mm,
 						   high_avail / vgpu_types[i].high_mm);
@@ -131,11 +139,12 @@ int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
 			sprintf(gvt->types[i].name, "GVTg_V5_%s",
 						vgpu_types[i].name);
 
-		gvt_dbg_core("type[%d]: %s avail %u low %u high %u fence %u res %s\n",
+		gvt_dbg_core("type[%d]: %s avail %u low %u high %u fence %u weight %u res %s\n",
 			     i, gvt->types[i].name,
 			     gvt->types[i].avail_instance,
 			     gvt->types[i].low_gm_size,
 			     gvt->types[i].high_gm_size, gvt->types[i].fence,
+			     gvt->types[i].weight,
 			     vgpu_edid_str(gvt->types[i].resolution));
 	}
 
@@ -290,6 +299,7 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
 	vgpu->id = ret;
 	vgpu->handle = param->handle;
 	vgpu->gvt = gvt;
+	vgpu->sched_ctl.weight = param->weight;
 	bitmap_zero(vgpu->tlb_handle_pending, I915_NUM_ENGINES);
 
 	intel_vgpu_init_cfg_space(vgpu, param->primary);
@@ -376,6 +386,7 @@ struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
 	param.low_gm_sz = type->low_gm_size;
 	param.high_gm_sz = type->high_gm_size;
 	param.fence_sz = type->fence;
+	param.weight = type->weight;
 	param.resolution = type->resolution;
 
 	/* XXX current param based on MB */
-- 
2.7.4