RE: [PATCH v6 3/6] drm/i915/gvt: Frame buffer decoder support for GVT-g

["Chen, Xiaoguang" <xiaoguang.chen@intel.com>]

>-----Original Message-----
>From: Zhenyu Wang [mailto:zhenyuw@linux.intel.com]
>Sent: Wednesday, May 31, 2017 1:12 PM
>To: Chen, Xiaoguang <xiaoguang.chen@intel.com>
>Cc: alex.williamson@redhat.com; kraxel@redhat.com; chris@chris-wilson.co.uk;
>intel-gfx@lists.freedesktop.org; linux-kernel@vger.kernel.org;
>zhenyuw@linux.intel.com; Lv, Zhiyuan <zhiyuan.lv@intel.com>; intel-gvt-
>dev@lists.freedesktop.org; Wang, Zhi A <zhi.a.wang@intel.com>; Tian, Kevin
><kevin.tian@intel.com>
>Subject: Re: [PATCH v6 3/6] drm/i915/gvt: Frame buffer decoder support for GVT-
>g
>
>On 2017.05.27 16:38:49 +0800, Xiaoguang Chen wrote:
>> decode frambuffer attributes of primary, cursor and sprite plane
>>
>> Signed-off-by: Xiaoguang Chen <xiaoguang.chen@intel.com>
>> ---
>>  drivers/gpu/drm/i915/gvt/Makefile     |   3 +-
>>  drivers/gpu/drm/i915/gvt/display.c    |   2 +-
>>  drivers/gpu/drm/i915/gvt/display.h    |   2 +
>>  drivers/gpu/drm/i915/gvt/fb_decoder.c | 479
>> ++++++++++++++++++++++++++++++++++
>>  drivers/gpu/drm/i915/gvt/fb_decoder.h | 166 ++++++++++++
>>  drivers/gpu/drm/i915/gvt/gvt.h        |   1 +
>>  6 files changed, 651 insertions(+), 2 deletions(-)  create mode
>> 100644 drivers/gpu/drm/i915/gvt/fb_decoder.c
>>  create mode 100644 drivers/gpu/drm/i915/gvt/fb_decoder.h
>>
>> diff --git a/drivers/gpu/drm/i915/gvt/Makefile
>> b/drivers/gpu/drm/i915/gvt/Makefile
>> index b123c20..192ca26 100644
>> --- a/drivers/gpu/drm/i915/gvt/Makefile
>> +++ b/drivers/gpu/drm/i915/gvt/Makefile
>> @@ -1,7 +1,8 @@
>>  GVT_DIR := gvt
>>  GVT_SOURCE := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o
>firmware.o \
>>  	interrupt.o gtt.o cfg_space.o opregion.o mmio.o display.o edid.o \
>> -	execlist.o scheduler.o sched_policy.o render.o cmd_parser.o
>> +	execlist.o scheduler.o sched_policy.o render.o cmd_parser.o \
>> +	fb_decoder.o
>>
>>  ccflags-y				+= -I$(src) -I$(src)/$(GVT_DIR) -Wall
>>  i915-y					+= $(addprefix $(GVT_DIR)/,
>$(GVT_SOURCE))
>> diff --git a/drivers/gpu/drm/i915/gvt/display.c
>> b/drivers/gpu/drm/i915/gvt/display.c
>> index e0261fc..f5f63c5 100644
>> --- a/drivers/gpu/drm/i915/gvt/display.c
>> +++ b/drivers/gpu/drm/i915/gvt/display.c
>> @@ -67,7 +67,7 @@ static int edp_pipe_is_enabled(struct intel_vgpu *vgpu)
>>  	return 1;
>>  }
>>
>> -static int pipe_is_enabled(struct intel_vgpu *vgpu, int pipe)
>> +int pipe_is_enabled(struct intel_vgpu *vgpu, int pipe)
>>  {
>>  	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
>>
>> diff --git a/drivers/gpu/drm/i915/gvt/display.h
>> b/drivers/gpu/drm/i915/gvt/display.h
>> index d73de22..b46b868 100644
>> --- a/drivers/gpu/drm/i915/gvt/display.h
>> +++ b/drivers/gpu/drm/i915/gvt/display.h
>> @@ -179,4 +179,6 @@ int intel_vgpu_init_display(struct intel_vgpu
>> *vgpu, u64 resolution);  void intel_vgpu_reset_display(struct
>> intel_vgpu *vgpu);  void intel_vgpu_clean_display(struct intel_vgpu
>> *vgpu);
>>
>> +int pipe_is_enabled(struct intel_vgpu *vgpu, int pipe);
>> +
>>  #endif
>> diff --git a/drivers/gpu/drm/i915/gvt/fb_decoder.c
>> b/drivers/gpu/drm/i915/gvt/fb_decoder.c
>> new file mode 100644
>> index 0000000..d4404fd
>> --- /dev/null
>> +++ b/drivers/gpu/drm/i915/gvt/fb_decoder.c
>> @@ -0,0 +1,479 @@
>> +/*
>> + * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
>> + *
>> + * Permission is hereby granted, free of charge, to any person
>> +obtaining a
>> + * copy of this software and associated documentation files (the
>> +"Software"),
>> + * to deal in the Software without restriction, including without
>> +limitation
>> + * the rights to use, copy, modify, merge, publish, distribute,
>> +sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom
>> +the
>> + * Software is furnished to do so, subject to the following conditions:
>> + *
>> + * The above copyright notice and this permission notice (including
>> +the next
>> + * paragraph) shall be included in all copies or substantial portions
>> +of the
>> + * Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>> +EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
>> +MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO
>EVENT
>> +SHALL
>> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
>DAMAGES
>> +OR OTHER
>> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
>> +ARISING FROM,
>> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
>> +DEALINGS IN THE
>> + * SOFTWARE.
>> + *
>> + * Authors:
>> + *    Kevin Tian <kevin.tian@intel.com>
>> + *
>> + * Contributors:
>> + *    Bing Niu <bing.niu@intel.com>
>> + *    Xu Han <xu.han@intel.com>
>> + *    Ping Gao <ping.a.gao@intel.com>
>> + *    Xiaoguang Chen <xiaoguang.chen@intel.com>
>> + *    Yang Liu <yang2.liu@intel.com>
>> + *
>> + */
>> +
>> +#include <uapi/drm/drm_fourcc.h>
>> +#include "i915_drv.h"
>> +#include "gvt.h"
>> +
>> +/* The below definitions are required by guest. */ // [63:0] x:R:G:B
>> +16:16:16:16 little endian #define DRM_FORMAT_XRGB161616_GVT
>> +fourcc_code('X', 'R', '4', '8') // [63:0] x:B:G:R 16:16:16:16 little
>> +endian #define DRM_FORMAT_XBGR161616_GVT  fourcc_code('X', 'B', '4',
>> +'8')
>> +
>
>Should be added to drm_fourcc?
Will add to drm_fourcc.

>
>> +#define FORMAT_NUM	16
>
>PRIMARY_FORMAT_NUM
>
>> +struct pixel_format {
>> +	int	drm_format;	/* Pixel format in DRM definition */
>> +	int	bpp;		/* Bits per pixel, 0 indicates invalid */
>> +	char *desc;		/* The description */
>> +};
>> +
>> +/* non-supported format has bpp default to 0 */ static struct
>> +pixel_format primary_pixel_formats[FORMAT_NUM] = {
>> +	[0x2] = {DRM_FORMAT_C8, 8, "8-bit Indexed"},
>> +	[0x5] = {DRM_FORMAT_RGB565, 16, "16-bit BGRX (5:6:5 MSB-R:G:B)"},
>> +	[0x6] = {DRM_FORMAT_XRGB8888, 32,
>> +		"32-bit BGRX (8:8:8:8 MSB-X:R:G:B)"},
>> +	[0x8] = {DRM_FORMAT_XBGR2101010, 32,
>> +		"32-bit RGBX (2:10:10:10 MSB-X:B:G:R)"},
>> +	[0xa] = {DRM_FORMAT_XRGB2101010, 32,
>> +		"32-bit BGRX (2:10:10:10 MSB-X:R:G:B)"},
>> +	[0xc] = {DRM_FORMAT_XRGB161616_GVT, 64,
>> +		"64-bit RGBX Floating Point(16:16:16:16 MSB-X:B:G:R)"},
>> +	[0xe] = {DRM_FORMAT_XBGR8888, 32,
>> +		"32-bit RGBX (8:8:8:8 MSB-X:B:G:R)"}, };
>
>might explicitly say this is bdw_pixel_formats?
Good suggestion :)

>
>> +
>> +/* non-supported format has bpp default to 0 */ static struct
>> +pixel_format skl_pixel_formats[] = {
>> +	{DRM_FORMAT_YUYV, 16, "16-bit packed YUYV (8:8:8:8 MSB-
>V:Y2:U:Y1)"},
>> +	{DRM_FORMAT_UYVY, 16, "16-bit packed UYVY (8:8:8:8 MSB-
>Y2:V:Y1:U)"},
>> +	{DRM_FORMAT_YVYU, 16, "16-bit packed YVYU (8:8:8:8 MSB-
>U:Y2:V:Y1)"},
>> +	{DRM_FORMAT_VYUY, 16, "16-bit packed VYUY (8:8:8:8 MSB-
>Y2:U:Y1:V)"},
>> +
>> +	{DRM_FORMAT_C8, 8, "8-bit Indexed"},
>> +	{DRM_FORMAT_RGB565, 16, "16-bit BGRX (5:6:5 MSB-R:G:B)"},
>> +	{DRM_FORMAT_ABGR8888, 32, "32-bit RGBA (8:8:8:8 MSB-A:B:G:R)"},
>> +	{DRM_FORMAT_XBGR8888, 32, "32-bit RGBX (8:8:8:8 MSB-X:B:G:R)"},
>> +
>> +	{DRM_FORMAT_ARGB8888, 32, "32-bit BGRA (8:8:8:8 MSB-A:R:G:B)"},
>> +	{DRM_FORMAT_XRGB8888, 32, "32-bit BGRX (8:8:8:8 MSB-X:R:G:B)"},
>> +	{DRM_FORMAT_XBGR2101010, 32, "32-bit RGBX (2:10:10:10 MSB-
>X:B:G:R)"},
>> +	{DRM_FORMAT_XRGB2101010, 32, "32-bit BGRX (2:10:10:10
>> +MSB-X:R:G:B)"},
>> +
>> +	{DRM_FORMAT_XRGB161616_GVT, 64,
>> +		"64-bit XRGB (16:16:16:16 MSB-X:R:G:B)"},
>> +	{DRM_FORMAT_XBGR161616_GVT, 64,
>> +		"64-bit XBGR (16:16:16:16 MSB-X:B:G:R)"},
>> +
>> +	/* non-supported format has bpp default to 0 */
>> +	{0, 0, NULL},
>> +};
>> +
>> +static int skl_format_to_drm(int format, bool rgb_order, bool alpha,
>> +	int yuv_order)
>> +{
>> +	int skl_pixel_formats_index = 14;
>> +
>> +	switch (format) {
>> +	case PLANE_CTL_FORMAT_INDEXED:
>> +		skl_pixel_formats_index = 4;
>> +		break;
>> +	case PLANE_CTL_FORMAT_RGB_565:
>> +		skl_pixel_formats_index = 5;
>> +		break;
>> +	case PLANE_CTL_FORMAT_XRGB_8888:
>> +		if (rgb_order)
>> +			skl_pixel_formats_index = alpha ? 6 : 7;
>> +		else
>> +			skl_pixel_formats_index = alpha ? 8 : 9;
>> +		break;
>> +	case PLANE_CTL_FORMAT_XRGB_2101010:
>> +		skl_pixel_formats_index = rgb_order ? 10 : 11;
>> +		break;
>> +
>> +	case PLANE_CTL_FORMAT_XRGB_16161616F:
>> +		skl_pixel_formats_index = rgb_order ? 12 : 13;
>> +		break;
>> +
>> +	case PLANE_CTL_FORMAT_YUV422:
>> +		skl_pixel_formats_index = yuv_order >> 16;
>> +		if (skl_pixel_formats_index > 3)
>> +			return -EINVAL;
>> +		break;
>> +
>> +	default:
>> +		break;
>> +	}
>> +
>> +	return skl_pixel_formats_index;
>> +}
>> +
>> +static u32 intel_vgpu_get_stride(struct intel_vgpu *vgpu, int pipe,
>> +	u32 tiled, int stride_mask, int bpp) {
>> +	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
>> +
>> +	u32 stride_reg = vgpu_vreg(vgpu, DSPSTRIDE(pipe)) & stride_mask;
>> +	u32 stride = stride_reg;
>> +
>> +	if (IS_SKYLAKE(dev_priv)) {
>> +		switch (tiled) {
>> +		case PLANE_CTL_TILED_LINEAR:
>> +			stride = stride_reg * 64;
>> +			break;
>> +		case PLANE_CTL_TILED_X:
>> +			stride = stride_reg * 512;
>> +			break;
>> +		case PLANE_CTL_TILED_Y:
>> +			stride = stride_reg * 128;
>> +			break;
>> +		case PLANE_CTL_TILED_YF:
>> +			if (bpp == 8)
>> +				stride = stride_reg * 64;
>> +			else if (bpp == 16 || bpp == 32 || bpp == 64)
>> +				stride = stride_reg * 128;
>> +			else
>> +				gvt_dbg_core("skl: unsupported bpp:%d\n", bpp);
>> +			break;
>> +		default:
>> +			gvt_dbg_core("skl: unsupported tile format:%x\n",
>> +				tiled);
>> +		}
>> +	}
>> +
>> +	return stride;
>> +}
>> +
>> +static int intel_vgpu_decode_primary_plane_format(struct intel_vgpu *vgpu,
>> +	int pipe, struct intel_vgpu_primary_plane_format *plane) {
>> +	u32	val, fmt;
>> +	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
>> +
>> +	val = vgpu_vreg(vgpu, DSPCNTR(pipe));
>> +	plane->enabled = !!(val & DISPLAY_PLANE_ENABLE);
>> +	if (!plane->enabled)
>> +		return 0;
>> +
>> +	if (IS_SKYLAKE(dev_priv)) {
>> +		plane->tiled = (val & PLANE_CTL_TILED_MASK) >>
>> +		_PLANE_CTL_TILED_SHIFT;
>> +		fmt = skl_format_to_drm(
>> +			val & PLANE_CTL_FORMAT_MASK,
>> +			val & PLANE_CTL_ORDER_RGBX,
>> +			val & PLANE_CTL_ALPHA_MASK,
>> +			val & PLANE_CTL_YUV422_ORDER_MASK);
>> +		plane->bpp = skl_pixel_formats[fmt].bpp;
>> +		plane->drm_format = skl_pixel_formats[fmt].drm_format;
>> +	} else {
>> +		plane->tiled = !!(val & DISPPLANE_TILED);
>> +		fmt = (val & DISPPLANE_PIXFORMAT_MASK) >>
>_PRI_PLANE_FMT_SHIFT;
>> +		plane->bpp = primary_pixel_formats[fmt].bpp;
>> +		plane->drm_format = primary_pixel_formats[fmt].drm_format;
>> +	}
>> +
>> +	if ((IS_SKYLAKE(dev_priv) && !skl_pixel_formats[fmt].bpp)
>> +		|| (!IS_SKYLAKE(dev_priv) &&
>> +			!primary_pixel_formats[fmt].bpp)) {
>
>Just if (!plane->bpp)?
Good suggestion :)

>
>> +		gvt_vgpu_err("Non-supported pixel format (0x%x)\n", fmt);
>> +		return -EINVAL;
>> +	}
>> +
>> +	plane->hw_format = fmt;
>> +
>> +	plane->base = vgpu_vreg(vgpu, DSPSURF(pipe)) & GTT_PAGE_MASK;
>> +
>> +	plane->stride = intel_vgpu_get_stride(vgpu, pipe, (plane->tiled << 10),
>> +		(IS_SKYLAKE(dev_priv)) ? (_PRI_PLANE_STRIDE_MASK >> 6) :
>> +		_PRI_PLANE_STRIDE_MASK, plane->bpp);
>> +
>> +	plane->width = (vgpu_vreg(vgpu, PIPESRC(pipe)) &
>_PIPE_H_SRCSZ_MASK) >>
>> +		_PIPE_H_SRCSZ_SHIFT;
>> +	plane->width += 1;
>> +	plane->height = (vgpu_vreg(vgpu, PIPESRC(pipe)) &
>> +			_PIPE_V_SRCSZ_MASK) >> _PIPE_V_SRCSZ_SHIFT;
>> +	plane->height += 1;	/* raw height is one minus the real value */
>> +
>> +	val = vgpu_vreg(vgpu, DSPTILEOFF(pipe));
>> +	plane->x_offset = (val & _PRI_PLANE_X_OFF_MASK) >>
>> +		_PRI_PLANE_X_OFF_SHIFT;
>> +	plane->y_offset = (val & _PRI_PLANE_Y_OFF_MASK) >>
>> +		_PRI_PLANE_Y_OFF_SHIFT;
>> +
>> +	return 0;
>> +}
>> +
>> +#define CURSOR_MODE_NUM	(1 << 6)
>
>CURSOR_FORMAT_NUM
>
>> +struct cursor_mode_format {
>> +	int	drm_format;	/* Pixel format in DRM definition */
>> +	u8	bpp;		/* Bits per pixel; 0 indicates invalid */
>> +	u32	width;		/* In pixel */
>> +	u32	height;		/* In lines */
>> +	char	*desc;		/* The description */
>> +};
>> +
>> +/* non-supported format has bpp default to 0 */ static struct
>> +cursor_mode_format cursor_pixel_formats[CURSOR_MODE_NUM] = {
>> +	[0x22]  = {DRM_FORMAT_ARGB8888, 32, 128, 128, "128x128 32bpp
>ARGB"},
>> +	[0x23]  = {DRM_FORMAT_ARGB8888, 32, 256, 256, "256x256 32bpp
>ARGB"},
>> +	[0x27]  = {DRM_FORMAT_ARGB8888, 32, 64, 64, "64x64 32bpp ARGB"},
>> +	[0x7]  = {DRM_FORMAT_ARGB8888, 32, 64, 64, "64x64 32bpp ARGB"}, };
>> +
>> +static int intel_vgpu_decode_cursor_plane_format(struct intel_vgpu *vgpu,
>> +	int pipe, struct intel_vgpu_cursor_plane_format *plane) {
>> +	u32 val, mode;
>> +	u32 alpha_plane, alpha_force;
>> +	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
>> +
>> +	val = vgpu_vreg(vgpu, CURCNTR(pipe));
>> +	mode = val & CURSOR_MODE;
>> +	plane->enabled = (mode != CURSOR_MODE_DISABLE);
>> +	if (!plane->enabled)
>> +		return 0;
>> +
>> +	if (!cursor_pixel_formats[mode].bpp) {
>> +		gvt_vgpu_err("Non-supported cursor mode (0x%x)\n", mode);
>> +		return -EINVAL;
>> +	}
>> +	plane->mode = mode;
>> +	plane->bpp = cursor_pixel_formats[mode].bpp;
>> +	plane->drm_format = cursor_pixel_formats[mode].drm_format;
>> +	plane->width = cursor_pixel_formats[mode].width;
>> +	plane->height = cursor_pixel_formats[mode].height;
>> +
>> +	alpha_plane = (val & _CURSOR_ALPHA_PLANE_MASK) >>
>> +				_CURSOR_ALPHA_PLANE_SHIFT;
>> +	alpha_force = (val & _CURSOR_ALPHA_FORCE_MASK) >>
>> +				_CURSOR_ALPHA_FORCE_SHIFT;
>> +	if (alpha_plane || alpha_force)
>> +		gvt_dbg_core("alpha_plane=0x%x, alpha_force=0x%x\n",
>> +			alpha_plane, alpha_force);
>> +
>> +	plane->base = vgpu_vreg(vgpu, CURBASE(pipe)) & GTT_PAGE_MASK;
>> +
>> +	val = vgpu_vreg(vgpu, CURPOS(pipe));
>> +	plane->x_pos = (val & _CURSOR_POS_X_MASK) >>
>_CURSOR_POS_X_SHIFT;
>> +	plane->x_sign = (val & _CURSOR_SIGN_X_MASK) >>
>_CURSOR_SIGN_X_SHIFT;
>> +	plane->y_pos = (val & _CURSOR_POS_Y_MASK) >>
>_CURSOR_POS_Y_SHIFT;
>> +	plane->y_sign = (val & _CURSOR_SIGN_Y_MASK) >>
>_CURSOR_SIGN_Y_SHIFT;
>> +
>> +	return 0;
>> +}
>> +
>> +#define FORMAT_NUM_SRRITE	(1 << 3)
>> +
>
>SPRITE_FORMAT_NUM
>
>> +static struct pixel_format sprite_pixel_formats[FORMAT_NUM_SRRITE] = {
>> +	[0x0]  = {DRM_FORMAT_YUV422, 16, "YUV 16-bit 4:2:2 packed"},
>> +	[0x1]  = {DRM_FORMAT_XRGB2101010, 32, "RGB 32-bit 2:10:10:10"},
>> +	[0x2]  = {DRM_FORMAT_XRGB8888, 32, "RGB 32-bit 8:8:8:8"},
>> +	[0x3]  = {DRM_FORMAT_XRGB161616_GVT, 64,
>> +		    "RGB 64-bit 16:16:16:16 Floating Point"},
>> +	[0x4] = {DRM_FORMAT_AYUV, 32,
>> +		"YUV 32-bit 4:4:4 packed (8:8:8:8 MSB-X:Y:U:V)"}, };
>> +
>> +static int intel_vgpu_decode_sprite_plane_format(struct intel_vgpu *vgpu,
>> +	int pipe, struct intel_vgpu_sprite_plane_format *plane) {
>> +	u32 val, fmt;
>> +	u32 width;
>> +	u32 color_order, yuv_order;
>> +	int drm_format;
>> +
>> +	val = vgpu_vreg(vgpu, SPRCTL(pipe));
>> +	plane->enabled = !!(val & SPRITE_ENABLE);
>> +	if (!plane->enabled)
>> +		return 0;
>> +
>> +	plane->tiled = !!(val & SPRITE_TILED);
>> +	color_order = !!(val & SPRITE_RGB_ORDER_RGBX);
>> +	yuv_order = (val & SPRITE_YUV_BYTE_ORDER_MASK) >>
>> +				_SPRITE_YUV_ORDER_SHIFT;
>> +
>> +	fmt = (val & SPRITE_PIXFORMAT_MASK) >> _SPRITE_FMT_SHIFT;
>> +	if (!sprite_pixel_formats[fmt].bpp) {
>> +		gvt_vgpu_err("Non-supported pixel format (0x%x)\n", fmt);
>> +		return -EINVAL;
>> +	}
>> +	plane->hw_format = fmt;
>> +	plane->bpp = sprite_pixel_formats[fmt].bpp;
>> +	drm_format = sprite_pixel_formats[fmt].drm_format;
>> +
>> +	/* Order of RGB values in an RGBxxx buffer may be ordered RGB or
>> +	 * BGR depending on the state of the color_order field
>> +	 */
>> +	if (!color_order) {
>> +		if (drm_format == DRM_FORMAT_XRGB2101010)
>> +			drm_format = DRM_FORMAT_XBGR2101010;
>> +		else if (drm_format == DRM_FORMAT_XRGB8888)
>> +			drm_format = DRM_FORMAT_XBGR8888;
>> +	}
>> +
>> +	if (drm_format == DRM_FORMAT_YUV422) {
>> +		switch (yuv_order) {
>> +		case	0:
>
>no extra space
>
>> +			drm_format = DRM_FORMAT_YUYV;
>> +			break;
>> +		case	1:
>> +			drm_format = DRM_FORMAT_UYVY;
>> +			break;
>> +		case	2:
>> +			drm_format = DRM_FORMAT_YVYU;
>> +			break;
>> +		case	3:
>> +			drm_format = DRM_FORMAT_VYUY;
>> +			break;
>> +		default:
>> +			/* yuv_order has only 2 bits */
>> +			break;
>> +		}
>> +	}
>> +
>> +	plane->drm_format = drm_format;
>> +
>> +	plane->base = vgpu_vreg(vgpu, SPRSURF(pipe)) & GTT_PAGE_MASK;
>> +	plane->width = vgpu_vreg(vgpu, SPRSTRIDE(pipe)) &
>> +				_SPRITE_STRIDE_MASK;
>> +	plane->width /= plane->bpp / 8;	/* raw width in bytes */
>> +
>> +	val = vgpu_vreg(vgpu, SPRSIZE(pipe));
>> +	plane->height = (val & _SPRITE_SIZE_HEIGHT_MASK) >>
>> +		_SPRITE_SIZE_HEIGHT_SHIFT;
>> +	width = (val & _SPRITE_SIZE_WIDTH_MASK) >>
>_SPRITE_SIZE_WIDTH_SHIFT;
>> +	plane->height += 1;	/* raw height is one minus the real value */
>> +	width += 1;		/* raw width is one minus the real value */
>> +	if (plane->width != width)
>> +		gvt_dbg_core("sprite_plane: plane->width=%d, width=%d\n",
>> +			plane->width, width);
>
>should report error?
OK.

>
>> +static int intel_vgpu_decode_fb_format(struct intel_gvt *gvt, int id,
>> +	struct intel_vgpu_fb_format *fb)
>> +{
>> +	int i;
>> +	struct intel_vgpu *vgpu = NULL;
>> +	int ret = 0;
>> +	struct drm_i915_private *dev_priv = gvt->dev_priv;
>> +
>> +	if (!fb)
>> +		return -EINVAL;
>> +
>> +	/* TODO: use fine-grained refcnt later */
>> +	mutex_lock(&gvt->lock);
>> +
>> +	for_each_active_vgpu(gvt, vgpu, i)
>> +		if (vgpu->id == id)
>> +			break;
>> +
>> +	if (!vgpu) {
>> +		gvt_vgpu_err("Invalid vgpu ID (%d)\n", id);
>> +		mutex_unlock(&gvt->lock);
>> +		return -ENODEV;
>> +	}
>> +
>> +	for (i = 0; i < I915_MAX_PIPES; i++) {
>> +		struct intel_vgpu_pipe_format *pipe = &fb->pipes[i];
>> +		u32 ddi_func_ctl = vgpu_vreg(vgpu, TRANS_DDI_FUNC_CTL(i));
>> +
>> +		if (!(ddi_func_ctl & TRANS_DDI_FUNC_ENABLE)) {
>> +			pipe->ddi_port = DDI_PORT_NONE;
>> +		} else {
>> +			u32 port = (ddi_func_ctl & TRANS_DDI_PORT_MASK) >>
>> +						TRANS_DDI_PORT_SHIFT;
>> +			if (port <= DDI_PORT_E)
>> +				pipe->ddi_port = port;
>> +			else
>> +				pipe->ddi_port = DDI_PORT_NONE;
>> +		}
>> +
>> +		ret |= intel_vgpu_decode_primary_plane_format(vgpu,
>> +			i, &pipe->primary);
>> +		ret |= intel_vgpu_decode_sprite_plane_format(vgpu,
>> +			i, &pipe->sprite);
>> +		ret |= intel_vgpu_decode_cursor_plane_format(vgpu,
>> +			i, &pipe->cursor);
>> +
>> +		if (ret) {
>> +			gvt_vgpu_err("Decode format error for pipe(%d)\n", i);
>> +			ret = -EINVAL;
>> +			break;
>> +		}
>> +	}
>> +
>> +	mutex_unlock(&gvt->lock);
>> +
>> +	return ret;
>> +}
>> +
>> +/**
>> + * intel_vgpu_decode_plane - Decode plane based on plane id
>> + * @dev: drm device
>> + * @vgpu: input vgpu
>> + * This function is called for decoding plane
>> + *
>> + * Returns:
>> + * pipe on success, NULL if failed.
>> + */
>> +struct intel_vgpu_pipe_format *intel_vgpu_decode_plane(struct drm_device
>*dev,
>> +		struct intel_vgpu *vgpu)
>> +{
>> +	struct drm_i915_private *dev_priv = dev->dev_private;
>> +	struct intel_vgpu_fb_format fb;
>> +	struct intel_vgpu_pipe_format *pipe;
>> +	int i;
>> +
>> +	if (intel_vgpu_decode_fb_format(dev_priv->gvt, vgpu->id, &fb))
>> +		return NULL;
>> +
>> +	for (i = 0; i < I915_MAX_PIPES; i++)
>> +		if (pipe_is_enabled(vgpu, i))
>> +			break;
>> +	if (i >= I915_MAX_PIPES) {
>> +		gvt_dbg_core("No enabled pipes\n");
>> +		return NULL;
>> +	}
>
>Looks this check should be moved in above decode_fb_format function which
>doesn't check if pipe is actually enabled.
Good suggestion :)

>
>> +	pipe = &fb.pipes[i];
>> +
>> +	if (!pipe || !pipe->primary.enabled) {
>> +		gvt_dbg_core("Invalid pipe_id :%d\n", i);
>> +		return NULL;
>> +	}
>
>And this function is to find primary plane actually? Should name it like
>intel_vgpu_decode_primary_plane().
Not exactly. This function will decode plane based on the input plane id in our case: primary plane and cursor plane.

>
>> +
>> +	return pipe;
>> +}
>> +
>> diff --git a/drivers/gpu/drm/i915/gvt/fb_decoder.h
>> b/drivers/gpu/drm/i915/gvt/fb_decoder.h
>> new file mode 100644
>> index 0000000..04300af
>> --- /dev/null
>> +++ b/drivers/gpu/drm/i915/gvt/fb_decoder.h
>> +
>> +struct intel_vgpu_pipe_format {
>> +	struct intel_vgpu_primary_plane_format	primary;
>> +	struct intel_vgpu_sprite_plane_format	sprite;
>> +	struct intel_vgpu_cursor_plane_format	cursor;
>> +	enum DDI_PORT ddi_port;  /* the DDI port that pipe is connected to
>> +*/ };
>> +
>> +struct intel_vgpu_fb_format {
>> +	struct intel_vgpu_pipe_format	pipes[4];
>> +};
>
>Should use MAX_PIPE definition.
>
>--
>Open Source Technology Center, Intel ltd.
>
>$gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827