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

From: Zhenyu Wang
Date: Wed May 31 2017 - 01:17:53 EST

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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@xxxxxxxxx>
> ---
> 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@xxxxxxxxx>
> + *
> + * Contributors:
> + * Bing Niu <bing.niu@xxxxxxxxx>
> + * Xu Han <xu.han@xxxxxxxxx>
> + * Ping Gao <ping.a.gao@xxxxxxxxx>
> + * Xiaoguang Chen <xiaoguang.chen@xxxxxxxxx>
> + * Yang Liu <yang2.liu@xxxxxxxxx>
> + *
> + */
> +
> +#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?

> +#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?

> +
> +/* 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)?

> + 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?

> +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.

> + 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().

> +
> + 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.

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