[PATCH v6 15/17] media: uapi: HEVC: fix padding in v4l2 control structures

Benjamin Gaignard
2022-05-27T14:32:02Z

Fix padding where needed to remove holes and stay align on cache boundaries

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
.../media/v4l/ext-ctrls-codec.rst | 6 +++---
drivers/media/v4l2-core/v4l2-ctrls-core.c | 9 ---------
include/media/hevc-ctrls.h | 19 ++++++++++++-------
3 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 05228e280f66..48a8825a001b 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -3509,9 +3509,6 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
* - __u8
- ``num_active_dpb_entries``
- The number of entries in ``dpb``.
- * - struct :c:type:`v4l2_hevc_dpb_entry`
- - ``dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- - The decoded picture buffer, for meta-data about reference frames.
* - __u8
- ``num_poc_st_curr_before``
- The number of reference pictures in the short-term set that come before
@@ -3535,6 +3532,9 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- ``poc_lt_curr[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- PocLtCurr as described in section 8.3.2 "Decoding process for reference
picture set": provides the index of the long term references in DPB array.
+ * - struct :c:type:`v4l2_hevc_dpb_entry`
+ - ``dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
+ - The decoded picture buffer, for meta-data about reference frames.
* - __u64
- ``flags``
- See :ref:`Decode Parameters Flags <hevc_decode_params_flags>`
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
index c5c5407584ff..fb68786c498b 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
@@ -824,20 +824,11 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
if (p_hevc_decode_params->num_active_dpb_entries >
V4L2_HEVC_DPB_ENTRIES_NUM_MAX)
return -EINVAL;
-
- for (i = 0; i < p_hevc_decode_params->num_active_dpb_entries;
- i++) {
- struct v4l2_hevc_dpb_entry *dpb_entry =
- &p_hevc_decode_params->dpb[i];
-
- zero_padding(*dpb_entry);
- }
break;

case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
p_hevc_slice_params = p;

- zero_padding(p_hevc_slice_params->pred_weight_table);
zero_padding(*p_hevc_slice_params);
break;

diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index efc0412ac41e..9abca1a75bd4 100644
--- a/include/media/hevc-ctrls.h
+++ b/include/media/hevc-ctrls.h
@@ -133,7 +133,9 @@ struct v4l2_ctrl_hevc_sps {
__u8 chroma_format_idc;
__u8 sps_max_sub_layers_minus1;

+ __u8 reserved[6];
__u64 flags;
+ __u8 padding[24];
};

#define V4L2_HEVC_PPS_FLAG_DEPENDENT_SLICE_SEGMENT_ENABLED (1ULL << 0)
@@ -210,9 +212,10 @@ struct v4l2_ctrl_hevc_pps {
__s8 pps_beta_offset_div2;
__s8 pps_tc_offset_div2;
__u8 log2_parallel_merge_level_minus2;
+ __u8 reserved[9];

- __u8 padding[4];
__u64 flags;
+ __u8 padding[56];
};

#define V4L2_HEVC_DPB_ENTRY_LONG_TERM_REFERENCE 0x01
@@ -245,8 +248,8 @@ struct v4l2_hevc_dpb_entry {
__u64 timestamp;
__u8 flags;
__u8 field_pic;
+ __u16 reserved;
__s32 pic_order_cnt_val;
- __u8 padding[2];
};

/**
@@ -285,8 +288,6 @@ struct v4l2_hevc_pred_weight_table {
__s8 delta_chroma_weight_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2];
__s8 chroma_offset_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2];

- __u8 padding[6];
-
__u8 luma_log2_weight_denom;
__s8 delta_chroma_log2_weight_denom;
};
@@ -381,18 +382,20 @@ struct v4l2_ctrl_hevc_slice_params {
/* ISO/IEC 23008-2, ITU-T Rec. H.265: Picture timing SEI message */
__u8 pic_struct;

+ __u8 reserved0[3];
/* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
__u32 slice_segment_addr;
__u8 ref_idx_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u8 ref_idx_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u16 short_term_ref_pic_set_size;
__u16 long_term_ref_pic_set_size;
- __u8 padding;

/* ISO/IEC 23008-2, ITU-T Rec. H.265: Weighted prediction parameter */
struct v4l2_hevc_pred_weight_table pred_weight_table;

+ __u8 reserved1[2];
__u64 flags;
+ __u8 padding[40];
};

#define V4L2_HEVC_DECODE_PARAM_FLAG_IRAP_PIC 0x1
@@ -408,7 +411,6 @@ struct v4l2_ctrl_hevc_slice_params {
* @long_term_ref_pic_set_size: specifies the size of long-term reference
* pictures set include in the SPS of the first slice
* @num_active_dpb_entries: the number of entries in dpb
- * @dpb: the decoded picture buffer, for meta-data about reference frames
* @num_poc_st_curr_before: the number of reference pictures in the short-term
* set that come before the current frame
* @num_poc_st_curr_after: the number of reference pictures in the short-term
@@ -419,6 +421,7 @@ struct v4l2_ctrl_hevc_slice_params {
* @poc_st_curr_after: provides the index of the short term after references
* in DPB array
* @poc_lt_curr: provides the index of the long term references in DPB array
+ * @dpb: the decoded picture buffer, for meta-data about reference frames
* @flags: see V4L2_HEVC_DECODE_PARAM_FLAG_{}
*/
struct v4l2_ctrl_hevc_decode_params {
@@ -426,14 +429,16 @@ struct v4l2_ctrl_hevc_decode_params {
__u16 short_term_ref_pic_set_size;
__u16 long_term_ref_pic_set_size;
__u8 num_active_dpb_entries;
- struct v4l2_hevc_dpb_entry dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u8 num_poc_st_curr_before;
__u8 num_poc_st_curr_after;
__u8 num_poc_lt_curr;
__u8 poc_st_curr_before[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u8 poc_st_curr_after[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u8 poc_lt_curr[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
+ __u8 reserved[4];
+ struct v4l2_hevc_dpb_entry dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u64 flags;
+ __u8 padding[56];
};

/**
--
2.32.0