[Intel-gfx] [PATCH v4] drm/i915/gvt: Deliver guest cursor hotspot info

[Zhenyu Wang]

On 2018.04.16 13:51:38 +0800, Tina Zhang wrote:
> 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.
> 
> 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 at intel.com>
> Cc: Zhenyu Wang <zhenyuw at linux.intel.com>
> Cc: Zhi Wang <zhi.a.wang at intel.com>
> Cc: Gerd Hoffmann <kraxel at redhat.com>
> ---
>  drivers/gpu/drm/i915/gvt/dmabuf.c     | 22 ++++++++++++++++------
>  drivers/gpu/drm/i915/gvt/fb_decoder.c |  3 +++
>  drivers/gpu/drm/i915/gvt/handlers.c   |  4 ++--
>  drivers/gpu/drm/i915/gvt/vgpu.c       |  3 +++
>  drivers/gpu/drm/i915/i915_pvinfo.h    |  5 ++++-
>  5 files changed, 28 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.c b/drivers/gpu/drm/i915/gvt/dmabuf.c
> index 6f4f8e9..a7c7082 100644
> --- a/drivers/gpu/drm/i915/gvt/dmabuf.c
> +++ b/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;

No way c could be NULL here.

> +	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 {
> diff --git a/drivers/gpu/drm/i915/gvt/fb_decoder.c b/drivers/gpu/drm/i915/gvt/fb_decoder.c
> index 1c12068..5e7468b 100644
> --- a/drivers/gpu/drm/i915/gvt/fb_decoder.c
> +++ b/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;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
> index a33c1c3e..2c824a9 100644
> --- a/drivers/gpu/drm/i915/gvt/handlers.c
> +++ b/drivers/gpu/drm/i915/gvt/handlers.c
> @@ -1201,8 +1201,8 @@ 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):
> diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
> index 2e0a02a..bf75300 100644
> --- a/drivers/gpu/drm/i915/gvt/vgpu.c
> +++ b/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));
> diff --git a/drivers/gpu/drm/i915/i915_pvinfo.h b/drivers/gpu/drm/i915/i915_pvinfo.h
> index 195203f..d61914a 100644
> --- a/drivers/gpu/drm/i915/i915_pvinfo.h
> +++ b/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;
> -- 
> 2.7.4
> 

-- 
Open Source Technology Center, Intel ltd.

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