From 09606b5446c25b2c3b16c5bd2977eca730e3a570 Mon Sep 17 00:00:00 2001 From: Christian König Date: Thu, 22 Mar 2018 17:09:42 +0100 Subject: dma-buf: add peer2peer flag MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a peer2peer flag noting that the importer can deal with device resources which are not backed by pages. Signed-off-by: Christian König Acked-by: Daniel Vetter Acked-by: Sumit Semwal Link: https://patchwork.freedesktop.org/patch/359286/ --- include/linux/dma-buf.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/linux') diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 1ade486fc2bb..82e0a4a64601 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -334,6 +334,14 @@ struct dma_buf { * Attachment operations implemented by the importer. */ struct dma_buf_attach_ops { + /** + * @allow_peer2peer: + * + * If this is set to true the importer must be able to handle peer + * resources without struct pages. + */ + bool allow_peer2peer; + /** * @move_notify * @@ -362,6 +370,7 @@ struct dma_buf_attach_ops { * @node: list of dma_buf_attachment, protected by dma_resv lock of the dmabuf. * @sgt: cached mapping. * @dir: direction of cached mapping. + * @peer2peer: true if the importer can handle peer resources without pages. * @priv: exporter specific attachment data. * @importer_ops: importer operations for this attachment, if provided * dma_buf_map/unmap_attachment() must be called with the dma_resv lock held. @@ -382,6 +391,7 @@ struct dma_buf_attachment { struct list_head node; struct sg_table *sgt; enum dma_data_direction dir; + bool peer2peer; const struct dma_buf_attach_ops *importer_ops; void *importer_priv; void *priv; -- cgit v1.2.3 From f45ce9336ff0640e491c642a84ea02f21daac3a4 Mon Sep 17 00:00:00 2001 From: Gwan-gyeong Mun Date: Thu, 14 May 2020 09:07:19 +0300 Subject: video/hdmi: Add Unpack only function for DRM infoframe It adds an unpack only function for DRM infoframe for dynamic range and mastering infoframe readout. It unpacks the information data block contained in the binary buffer into a structured frame of the HDMI Dynamic Range and Mastering (DRM) information frame. In contrast to hdmi_drm_infoframe_unpack() function, it does not verify a checksum. It can be used for unpacking a DP HDR Metadata Infoframe SDP case. DP HDR Metadata Infoframe SDP uses the same Dynamic Range and Mastering (DRM) information (CTA-861-G spec.) such as HDMI DRM infoframe. But DP SDP header and payload structure are different from HDMI DRM Infoframe. Therefore unpacking DRM infoframe for DP requires skipping of a verifying checksum. v9: Add clear comments to hdmi_drm_infoframe_unpack_only() and hdmi_drm_infoframe_unpack() (Laurent Pinchart) Signed-off-by: Gwan-gyeong Mun Reviewed-by: Uma Shankar Cc: Laurent Pinchart Cc: Ville Syrjala Acked-by: Daniel Vetter Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/20200514060732.3378396-2-gwan-gyeong.mun@intel.com --- drivers/video/hdmi.c | 65 +++++++++++++++++++++++++++++++++++++--------------- include/linux/hdmi.h | 2 ++ 2 files changed, 48 insertions(+), 19 deletions(-) (limited to 'include/linux') diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index 856a8c4e84a2..e70792b3e367 100644 --- a/drivers/video/hdmi.c +++ b/drivers/video/hdmi.c @@ -1768,20 +1768,21 @@ hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame, } /** - * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe + * hdmi_drm_infoframe_unpack_only() - unpack binary buffer of CTA-861-G DRM + * infoframe DataBytes to a HDMI DRM + * infoframe * @frame: HDMI DRM infoframe * @buffer: source buffer * @size: size of buffer * - * Unpacks the information contained in binary @buffer into a structured - * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame. - * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 - * specification. + * Unpacks CTA-861-G DRM infoframe DataBytes contained in the binary @buffer + * into a structured @frame of the HDMI Dynamic Range and Mastering (DRM) + * infoframe. * * Returns 0 on success or a negative error code on failure. */ -static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, - const void *buffer, size_t size) +int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame, + const void *buffer, size_t size) { const u8 *ptr = buffer; const u8 *temp; @@ -1790,23 +1791,13 @@ static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, int ret; int i; - if (size < HDMI_INFOFRAME_SIZE(DRM)) - return -EINVAL; - - if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM || - ptr[1] != 1 || - ptr[2] != HDMI_DRM_INFOFRAME_SIZE) - return -EINVAL; - - if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0) + if (size < HDMI_DRM_INFOFRAME_SIZE) return -EINVAL; ret = hdmi_drm_infoframe_init(frame); if (ret) return ret; - ptr += HDMI_INFOFRAME_HEADER_SIZE; - frame->eotf = ptr[0] & 0x7; frame->metadata_type = ptr[1] & 0x7; @@ -1814,7 +1805,7 @@ static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, for (i = 0; i < 3; i++) { x_lsb = *temp++; x_msb = *temp++; - frame->display_primaries[i].x = (x_msb << 8) | x_lsb; + frame->display_primaries[i].x = (x_msb << 8) | x_lsb; y_lsb = *temp++; y_msb = *temp++; frame->display_primaries[i].y = (y_msb << 8) | y_lsb; @@ -1830,6 +1821,42 @@ static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, return 0; } +EXPORT_SYMBOL(hdmi_drm_infoframe_unpack_only); + +/** + * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe + * @frame: HDMI DRM infoframe + * @buffer: source buffer + * @size: size of buffer + * + * Unpacks the CTA-861-G DRM infoframe contained in the binary @buffer into + * a structured @frame of the HDMI Dynamic Range and Mastering (DRM) + * infoframe. It also verifies the checksum as required by section 5.3.5 of + * the HDMI 1.4 specification. + * + * Returns 0 on success or a negative error code on failure. + */ +static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, + const void *buffer, size_t size) +{ + const u8 *ptr = buffer; + int ret; + + if (size < HDMI_INFOFRAME_SIZE(DRM)) + return -EINVAL; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM || + ptr[1] != 1 || + ptr[2] != HDMI_DRM_INFOFRAME_SIZE) + return -EINVAL; + + if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0) + return -EINVAL; + + ret = hdmi_drm_infoframe_unpack_only(frame, ptr + HDMI_INFOFRAME_HEADER_SIZE, + size - HDMI_INFOFRAME_HEADER_SIZE); + return ret; +} /** * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index 9613d796cfb1..50c31f1a0a2d 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -219,6 +219,8 @@ ssize_t hdmi_drm_infoframe_pack(struct hdmi_drm_infoframe *frame, void *buffer, ssize_t hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame, void *buffer, size_t size); int hdmi_drm_infoframe_check(struct hdmi_drm_infoframe *frame); +int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame, + const void *buffer, size_t size); enum hdmi_spd_sdi { HDMI_SPD_SDI_UNKNOWN, -- cgit v1.2.3