Hi Ville,
Did you get a chance to review this patch?
- Vandana
> -----Original Message-----
> From: Kannan, Vandana
> Sent: Friday, May 13, 2016 7:35 PM
> To: intel-gfx@lists.freedesktop.org
> Cc: Kannan, Vandana <vandana.kan...@intel.com>; Ville Syrjälä
> <ville.syrj...@linux.intel.com>; Smith, Gary K <gary.k.sm...@intel.com>
> Subject: [PATCH v3 2/2] drm/i915: Render decompression support for
> Gen9 and above
>
> This patch includes enabling render decompression (RC) after checking all
> the requirements (format, tiling, rotation etc.).
>
> TODO:
> 1. Disable stereo 3D when render decomp is enabled (bit 7:6) 2. Render
> decompression must not be used in VTd pass-through mode 3. Program
> hashing select CHICKEN_MISC1 bit 15 4. For Gen10, add support for RGB
> 1010102 5. RC-FBC workaround 6. RC watermark calculation
>
> The reason for using a plane property instead of fb modifier:- In Android,
> OGL passes a render compressed buffer to hardware composer (HWC),
> which would then request a flip on that buffer after checking if the target
> can support render compressed buffer. For example, only planes
> 1 and 2 on pipes 1 and 2 can support RC. In case the target cannot
> support it, HWC will revert back to OGL requesting for uncompressed
> buffer.
> Here,
> if plane property is used, OGL would send back the buffer (same ID) after
> decompression, marked uncompressed. If fb modifier was used, a different
> version of the buffer would have to be maintained for different
> combinations - in the simple case of render compressed vs uncompressed
> buffer, there would be 2 fbs with 2 IDs. So, in this case, OGL would give a
> reference to a fb with a different ID.
> To avoid the difficulty of keeping track of multiple fbs and the
> subsequent complexity in debug, the architecture forum decided to go
> ahead with a plane property for RC.
>
> [Mayuresh] Added the plane check in skl_check_compression()
>
> v2: Ville's review comments addressed
> - Removed WAs specific to SKL-C and BXT-A
> - Assign capabilities according to pipe and plane during property creation
> - in skl_check_compression(), check for conditions that must be satisifed
>
> Maintaining the check for pixel format, even though compressed fb of
> format other RGB8888 should not have been created, to be on the safer
> side.
> Added checks for BGR8888 too.
> Bitmask is being used for the property to accommodate 2 more options
> expected to be added in future.
>
> v3: This patch has been implemented on top of Ville's patch series on
> fb->offsets.
> (Ref: git://github.com/vsyrjala/linux.git fb_offsets_15)
> - Userspace is expected to pass aux offset through fb->offsets[1].
>
> Testing is in progress for v3 of the patch.
>
> Signed-off-by: Vandana Kannan <vandana.kan...@intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Smith, Gary K <gary.k.sm...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/i915_reg.h | 22 ++++++
> drivers/gpu/drm/i915/intel_atomic_plane.c | 24 +++++--
> drivers/gpu/drm/i915/intel_display.c | 111
> ++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 10 +++
> drivers/gpu/drm/i915/intel_sprite.c | 13 ++++
> 6 files changed, 177 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h index 7a0b513..0465e0f 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1915,6 +1915,7 @@ struct drm_i915_private {
>
> struct drm_property *broadcast_rgb_property;
> struct drm_property *force_audio_property;
> + struct drm_property *render_comp_property;
>
> /* hda/i915 audio component */
> struct i915_audio_component *audio_component; diff --git
> a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 54ce0b1..9d008e1 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5818,6 +5818,28 @@ enum skl_disp_power_wells {
> _ID(id, _PS_ECC_STAT_1A, _PS_ECC_STAT_2A), \
> _ID(id, _PS_ECC_STAT_1B, _PS_ECC_STAT_2B))
>
> +#define PLANE_AUX_DIST_1_A 0x701c0
> +#define PLANE_AUX_DIST_2_A 0x702c0
> +#define PLANE_AUX_DIST_1_B 0x711c0
> +#define PLANE_AUX_DIST_2_B 0x712c0
> +#define _PLANE_AUX_DIST_1(pipe) \
> + _PIPE(pipe, PLANE_AUX_DIST_1_A,
> PLANE_AUX_DIST_1_B) #define
> +_PLANE_AUX_DIST_2(pipe) \
> + _PIPE(pipe, PLANE_AUX_DIST_2_A,
> PLANE_AUX_DIST_2_B)
> +#define PLANE_AUX_DIST(pipe, plane) \
> + _MMIO_PLANE(plane, _PLANE_AUX_DIST_1(pipe),
> _PLANE_AUX_DIST_2(pipe))
> +
> +#define PLANE_AUX_OFFSET_1_A 0x701c4
> +#define PLANE_AUX_OFFSET_2_A 0x702c4
> +#define PLANE_AUX_OFFSET_1_B 0x711c4
> +#define PLANE_AUX_OFFSET_2_B 0x712c4
> +#define _PLANE_AUX_OFFSET_1(pipe) \
> + _PIPE(pipe, PLANE_AUX_OFFSET_1_A,
> PLANE_AUX_OFFSET_1_B)
> +#define _PLANE_AUX_OFFSET_2(pipe) \
> + _PIPE(pipe, PLANE_AUX_OFFSET_2_A,
> PLANE_AUX_OFFSET_2_B)
> +#define PLANE_AUX_OFFSET(pipe, plane) \
> + _MMIO_PLANE(plane, _PLANE_AUX_OFFSET_1(pipe),
> +_PLANE_AUX_OFFSET_2(pipe))
> +
> /* legacy palette */
> #define _LGC_PALETTE_A 0x4a000
> #define _LGC_PALETTE_B 0x4a800
> diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c
> b/drivers/gpu/drm/i915/intel_atomic_plane.c
> index 7de7721..2617b75 100644
> --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> @@ -228,8 +228,16 @@ intel_plane_atomic_get_property(struct
> drm_plane *plane,
> struct drm_property *property,
> uint64_t *val)
> {
> - DRM_DEBUG_KMS("Unknown plane property '%s'\n", property-
> >name);
> - return -EINVAL;
> + struct drm_i915_private *dev_priv = state->plane->dev-
> >dev_private;
> + struct intel_plane_state *intel_state = to_intel_plane_state(state);
> +
> + if (property == dev_priv->render_comp_property) {
> + *val = intel_state->render_comp_enable;
> + } else {
> + DRM_DEBUG_KMS("Unknown plane property '%s'\n",
> property->name);
> + return -EINVAL;
> + }
> + return 0;
> }
>
> /**
> @@ -250,6 +258,14 @@ intel_plane_atomic_set_property(struct drm_plane
> *plane,
> struct drm_property *property,
> uint64_t val)
> {
> - DRM_DEBUG_KMS("Unknown plane property '%s'\n", property-
> >name);
> - return -EINVAL;
> + struct drm_i915_private *dev_priv = state->plane->dev-
> >dev_private;
> + struct intel_plane_state *intel_state = to_intel_plane_state(state);
> +
> + if (property == dev_priv->render_comp_property) {
> + intel_state->render_comp_enable = val;
> + } else {
> + DRM_DEBUG_KMS("Unknown plane property '%s'\n",
> property->name);
> + return -EINVAL;
> + }
> + return 0;
> }
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index 33dad36..f006724 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -117,6 +117,7 @@ static void ironlake_pfit_disable(struct intel_crtc
> *crtc, bool force); static void ironlake_pfit_enable(struct intel_crtc
> *crtc);
> static void intel_modeset_setup_hw_state(struct drm_device *dev); static
> void intel_pre_disable_primary_noatomic(struct drm_crtc *crtc);
> +static int skl_check_compression(struct intel_plane_state
> +*plane_state);
>
> typedef struct {
> int min, max;
> @@ -3032,6 +3033,15 @@ int skl_check_plane_surface(struct
> intel_plane_state *plane_state)
> ret = skl_check_nv12_aux_surface(plane_state);
> if (ret)
> return ret;
> + } else if (fb && plane_state->render_comp_enable) {
> + ret = skl_check_compression(plane_state);
> + if (ret) {
> + DRM_DEBUG_KMS("Render compr checks failed\n");
> + return ret;
> + }
> + plane_state->aux.offset = fb->offsets[1];
> + plane_state->aux.x = 0;
> + plane_state->aux.y = 0;
> } else {
> plane_state->aux.offset = ~0xfff;
> plane_state->aux.x = 0;
> @@ -3424,6 +3434,7 @@ static void skylake_update_primary_plane(struct
> drm_plane *plane,
> u32 plane_ctl;
> unsigned int rotation = plane_state->base.rotation;
> u32 stride = skl_plane_stride(fb, 0, rotation);
> + u32 aux_stride = skl_plane_stride(fb, 1, rotation);
> u32 surf_addr = plane_state->main.offset;
> int scaler_id = plane_state->scaler_id;
> int src_x = plane_state->main.x;
> @@ -3453,10 +3464,19 @@ static void
> skylake_update_primary_plane(struct drm_plane *plane,
> intel_crtc->adjusted_x = src_x;
> intel_crtc->adjusted_y = src_y;
>
> + if (plane_state->render_comp_enable)
> + plane_ctl |= PLANE_CTL_DECOMPRESSION_ENABLE;
> + else
> + plane_ctl &= ~PLANE_CTL_DECOMPRESSION_ENABLE;
> +
> I915_WRITE(PLANE_CTL(pipe, 0), plane_ctl);
> I915_WRITE(PLANE_OFFSET(pipe, 0), (src_y << 16) | src_x);
> I915_WRITE(PLANE_STRIDE(pipe, 0), stride);
> I915_WRITE(PLANE_SIZE(pipe, 0), (src_h << 16) | src_w);
> + I915_WRITE(PLANE_AUX_DIST(pipe, 0),
> + plane_state->aux.offset | aux_stride);
> + I915_WRITE(PLANE_AUX_OFFSET(pipe, 0),
> + plane_state->aux.y <<16 | plane_state-
> >aux.x);
>
> if (scaler_id >= 0) {
> uint32_t ps_ctrl = 0;
> @@ -12189,6 +12209,8 @@ int intel_plane_atomic_calc_changes(struct
> drm_crtc_state *crtc_state,
> return ret;
> }
>
> +
> +
> was_visible = old_plane_state->visible;
> visible = to_intel_plane_state(plane_state)->visible;
>
> @@ -14318,6 +14340,54 @@ skl_max_scale(struct intel_crtc *intel_crtc,
> struct intel_crtc_state *crtc_state
> return max_scale;
> }
>
> +int skl_check_compression(struct intel_plane_state *plane_state) {
> + struct drm_framebuffer *fb = plane_state->base.fb;
> + int x_offset = plane_state->src.x1 >> 17;
> + int src_w = drm_rect_width(&plane_state->src) >> 16;
> +
> + /*
> + * TODO:
> + * 1. Disable stereo 3D when render decomp is enabled (bit 7:6)
> + * 2. Render decompression must not be used in VTd pass-through
> mode
> + * 3. Program hashing select CHICKEN_MISC1 bit 15
> + */
> +
> + if (plane_state->base.rotation &
> + ~(BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180))) {
> + DRM_DEBUG_KMS("RC support only with 0/180 degree
> rotation\n");
> + return -EINVAL;
> + }
> +
> + if ((fb->modifier[0] != I915_FORMAT_MOD_Y_TILED) &&
> + (fb->modifier[0] != I915_FORMAT_MOD_Yf_TILED)) {
> + DRM_DEBUG_KMS("RC supported only with Y-tile\n");
> + return -EINVAL;
> + }
> +
> + if ((fb->pixel_format != DRM_FORMAT_XBGR8888) &&
> + (fb->pixel_format != DRM_FORMAT_ABGR8888) &&
> + (fb->pixel_format != DRM_FORMAT_XRGB8888) &&
> + (fb->pixel_format != DRM_FORMAT_ARGB8888)) {
> + DRM_DEBUG_KMS("RC supported only with RGB8888
> formats\n");
> + return -EINVAL;
> + }
> +
> + /*
> + * For SKL & BXT,
> + * When the render compression is enabled with plane
> + * width greater than 3840 and horizontal panning,
> + * the stride programmed in the PLANE_STRIDE register
> + * must be multiple of 4.
> + */
> + if (src_w > 3840 && x_offset != 0) {
> + DRM_DEBUG_KMS("RC: width > 3840, horizontal
> panning\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static int
> intel_check_primary_plane(struct drm_plane *plane,
> struct intel_crtc_state *crtc_state, @@ -14487,6
> +14557,9 @@ static struct drm_plane *intel_primary_plane_create(struct
> drm_device *dev,
> if (INTEL_INFO(dev)->gen >= 4)
> intel_create_rotation_property(dev, primary);
>
> + if (INTEL_INFO(dev)->gen >= 9)
> + intel_create_render_comp_property(dev, primary);
> +
> drm_plane_helper_add(&primary->base,
> &intel_plane_helper_funcs);
>
> return &primary->base;
> @@ -14516,6 +14589,44 @@ void intel_create_rotation_property(struct
> drm_device *dev, struct intel_plane *
> plane->base.state->rotation);
> }
>
> +void intel_create_render_comp_property(struct drm_device *dev,
> + struct intel_plane *plane)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct drm_plane *drm_plane = &plane->base;
> + unsigned long flags = BIT(COMP_UNCOMPRESSED);
> +
> + static const struct drm_prop_enum_list rc_status[] = {
> + { COMP_UNCOMPRESSED, "Uncompressed/not capable" },
> + { COMP_RENDER, "Only render decompression" },
> + };
> +
> + if (plane->pipe != PIPE_C ||
> + (drm_plane->type == DRM_PLANE_TYPE_PRIMARY ||
> + (drm_plane->type == DRM_PLANE_TYPE_OVERLAY
> &&
> + plane->plane == PLANE_A))) {
> + flags |= BIT(COMP_RENDER);
> + }
> +
> + if (!dev_priv->render_comp_property) {
> + dev_priv->render_comp_property =
> + drm_property_create_bitmask(dev, 0,
> + "render compression",
> + rc_status, ARRAY_SIZE(rc_status),
> + flags);
> + if (!dev_priv->render_comp_property) {
> + DRM_ERROR("RC: Failed to create property\n");
> + return;
> + }
> + }
> +
> + if (dev_priv->render_comp_property) {
> + drm_object_attach_property(&plane->base.base,
> + dev_priv->render_comp_property, 0);
> + }
> + dev->mode_config.allow_aux_plane = true; }
> +
> static int
> intel_check_cursor_plane(struct drm_plane *plane,
> struct intel_crtc_state *crtc_state, diff --git
> a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 8901ce5..ff8b804 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -314,6 +314,10 @@ struct intel_atomic_state {
> bool skip_intermediate_wm;
> };
>
> +/* render compression property bits */
> +#define COMP_UNCOMPRESSED 0
> +#define COMP_RENDER 1
> +
> struct intel_plane_state {
> struct drm_plane_state base;
> struct drm_rect src;
> @@ -353,6 +357,9 @@ struct intel_plane_state {
>
> /* async flip related structures */
> struct drm_i915_gem_request *wait_req;
> +
> + /* Render compression */
> + unsigned int render_comp_enable;
> };
>
> struct intel_initial_plane_config {
> @@ -1225,6 +1232,9 @@ intel_rotation_90_or_270(unsigned int rotation)
> void intel_create_rotation_property(struct drm_device *dev,
> struct intel_plane *plane);
>
> +void intel_create_render_comp_property(struct drm_device *dev,
> + struct intel_plane *plane);
> +
> void assert_pch_transcoder_disabled(struct drm_i915_private *dev_priv,
> enum pipe pipe);
>
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> b/drivers/gpu/drm/i915/intel_sprite.c
> index 02e8401..658751f 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -193,6 +193,7 @@ skl_update_plane(struct drm_plane *drm_plane,
> u32 surf_addr = plane_state->main.offset;
> unsigned int rotation = plane_state->base.rotation;
> u32 stride = skl_plane_stride(fb, 0, rotation);
> + u32 aux_stride = skl_plane_stride(fb, 1, rotation);
> int crtc_x = plane_state->dst.x1;
> int crtc_y = plane_state->dst.y1;
> uint32_t crtc_w = drm_rect_width(&plane_state->dst);
> @@ -213,6 +214,11 @@ skl_update_plane(struct drm_plane *drm_plane,
>
> plane_ctl |= skl_plane_ctl_rotation(rotation);
>
> + if (plane_state->render_comp_enable)
> + plane_ctl |= PLANE_CTL_DECOMPRESSION_ENABLE;
> + else
> + plane_ctl &= ~PLANE_CTL_DECOMPRESSION_ENABLE;
> +
> if (key->flags) {
> I915_WRITE(PLANE_KEYVAL(pipe, plane), key->min_value);
> I915_WRITE(PLANE_KEYMAX(pipe, plane), key->max_value);
> @@ -233,6 +239,10 @@ skl_update_plane(struct drm_plane *drm_plane,
> I915_WRITE(PLANE_OFFSET(pipe, plane), (y << 16) | x);
> I915_WRITE(PLANE_STRIDE(pipe, plane), stride);
> I915_WRITE(PLANE_SIZE(pipe, plane), (src_h << 16) | src_w);
> + I915_WRITE(PLANE_AUX_DIST(pipe, 0),
> + plane_state->aux.offset | aux_stride);
> + I915_WRITE(PLANE_AUX_OFFSET(pipe, 0),
> + plane_state->aux.y <<16 | plane_state->aux.x);
>
> /* program plane scaler */
> if (plane_state->scaler_id >= 0) {
> @@ -1095,6 +1105,9 @@ intel_plane_init(struct drm_device *dev, enum
> pipe pipe, int plane)
>
> intel_create_rotation_property(dev, intel_plane);
>
> + if (INTEL_INFO(dev)->gen >= 9)
> + intel_create_render_comp_property(dev, intel_plane);
> +
> drm_plane_helper_add(&intel_plane->base,
> &intel_plane_helper_funcs);
>
> return 0;
> --
> 1.9.1
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