drm/i915/gvt: Deliver guest cursor hotspot info

Guest OS driver uses PV info registers to deliver cursor hotspot info
to host. This patch is used to get cursor hotspot info from virtual
registers and deliver it to host userspace.

v4->v5:
- remove CI warning.

v3->v4:
- return UINT_MAX when x_hot/y_hot is invalid. (Zhenyu)
- correct version.

v2->v3:
- add validate_hotspot(). (Zhenyu)

v1->v2:
- name as cursor_x_hot/cursor_y_hot. (Zhenyu)
- use i915_reg_t definition instead of magic numbers. (Zhenyu)

Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/dmabuf.c

@@ -192,6 +192,14 @@ static struct drm_i915_gem_object *vgpu_create_gem(struct drm_device *dev,
 	return obj;
 }
 
+static bool validate_hotspot(struct intel_vgpu_cursor_plane_format *c)
+{
+	if (c && c->x_hot <= c->width && c->y_hot <= c->height)
+		return true;
+	else
+		return false;
+}
+
 static int vgpu_get_plane_info(struct drm_device *dev,
 		struct intel_vgpu *vgpu,
 		struct intel_vgpu_fb_info *info,
@@ -229,12 +237,14 @@ static int vgpu_get_plane_info(struct drm_device *dev,
 		info->x_pos = c.x_pos;
 		info->y_pos = c.y_pos;
 
-		/* The invalid cursor hotspot value is delivered to host
-		 * until we find a way to get the cursor hotspot info of
-		 * guest OS.
-		 */
-		info->x_hot = UINT_MAX;
-		info->y_hot = UINT_MAX;
+		if (validate_hotspot(&c)) {
+			info->x_hot = c.x_hot;
+			info->y_hot = c.y_hot;
+		} else {
+			info->x_hot = UINT_MAX;
+			info->y_hot = UINT_MAX;
+		}
+
 		info->size = (((info->stride * c.height * c.bpp) / 8)
 				+ (PAGE_SIZE - 1)) >> PAGE_SHIFT;
 	} else {

drivers/gpu/drm/i915/gvt/fb_decoder.c

@@ -36,6 +36,7 @@
 #include <uapi/drm/drm_fourcc.h>
 #include "i915_drv.h"
 #include "gvt.h"
+#include "i915_pvinfo.h"
 
 #define PRIMARY_FORMAT_NUM	16
 struct pixel_format {
@@ -384,6 +385,8 @@ int intel_vgpu_decode_cursor_plane(struct intel_vgpu *vgpu,
 	plane->y_pos = (val & _CURSOR_POS_Y_MASK) >> _CURSOR_POS_Y_SHIFT;
 	plane->y_sign = (val & _CURSOR_SIGN_Y_MASK) >> _CURSOR_SIGN_Y_SHIFT;
 
+	plane->x_hot = vgpu_vreg_t(vgpu, vgtif_reg(cursor_x_hot));
+	plane->y_hot = vgpu_vreg_t(vgpu, vgtif_reg(cursor_y_hot));
 	return 0;
 }
 

drivers/gpu/drm/i915/gvt/handlers.c

@@ -1204,8 +1204,8 @@ static int pvinfo_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 		ret = handle_g2v_notification(vgpu, data);
 		break;
 	/* add xhot and yhot to handled list to avoid error log */
-	case 0x78830:
-	case 0x78834:
+	case _vgtif_reg(cursor_x_hot):
+	case _vgtif_reg(cursor_y_hot):
 	case _vgtif_reg(pdp[0].lo):
 	case _vgtif_reg(pdp[0].hi):
 	case _vgtif_reg(pdp[1].lo):

drivers/gpu/drm/i915/gvt/vgpu.c

@@ -58,6 +58,9 @@ void populate_pvinfo_page(struct intel_vgpu *vgpu)
 
 	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.fence_num)) = vgpu_fence_sz(vgpu);
 
+	vgpu_vreg_t(vgpu, vgtif_reg(cursor_x_hot)) = UINT_MAX;
+	vgpu_vreg_t(vgpu, vgtif_reg(cursor_y_hot)) = UINT_MAX;
+
 	gvt_dbg_core("Populate PVINFO PAGE for vGPU %d\n", vgpu->id);
 	gvt_dbg_core("aperture base [GMADR] 0x%llx size 0x%llx\n",
 		vgpu_aperture_gmadr_base(vgpu), vgpu_aperture_sz(vgpu));

drivers/gpu/drm/i915/i915_pvinfo.h

@@ -93,7 +93,10 @@ struct vgt_if {
 	u32 rsv5[4];
 
 	u32 g2v_notify;
-	u32 rsv6[7];
+	u32 rsv6[5];
+
+	u32 cursor_x_hot;
+	u32 cursor_y_hot;
 
 	struct {
 		u32 lo;