1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * A virtual stateless device for stateless uAPI development purposes. 4 * 5 * This tool's objective is to help the development and testing of userspace 6 * applications that use the V4L2 stateless API to decode media. 7 * 8 * A userspace implementation can use visl to run a decoding loop even when no 9 * hardware is available or when the kernel uAPI for the codec has not been 10 * upstreamed yet. This can reveal bugs at an early stage. 11 * 12 * This driver can also trace the contents of the V4L2 controls submitted to it. 13 * It can also dump the contents of the vb2 buffers through a debugfs 14 * interface. This is in many ways similar to the tracing infrastructure 15 * available for other popular encode/decode APIs out there and can help develop 16 * a userspace application by using another (working) one as a reference. 17 * 18 * Note that no actual decoding of video frames is performed by visl. The V4L2 19 * test pattern generator is used to write various debug information to the 20 * capture buffers instead. 21 * 22 * Copyright (C) 2022 Collabora, Ltd. 23 * 24 * Based on the vim2m driver, that is: 25 * 26 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd. 27 * Pawel Osciak, <pawel@osciak.com> 28 * Marek Szyprowski, <m.szyprowski@samsung.com> 29 * 30 * Based on the vicodec driver, that is: 31 * 32 * Copyright 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved. 33 * 34 * Based on the Cedrus VPU driver, that is: 35 * 36 * Copyright (C) 2016 Florent Revest <florent.revest@free-electrons.com> 37 * Copyright (C) 2018 Paul Kocialkowski <paul.kocialkowski@bootlin.com> 38 * Copyright (C) 2018 Bootlin 39 */ 40 41 #ifndef _VISL_H_ 42 #define _VISL_H_ 43 44 #include <linux/debugfs.h> 45 #include <linux/list.h> 46 47 #include <media/v4l2-ctrls.h> 48 #include <media/v4l2-device.h> 49 #include <media/tpg/v4l2-tpg.h> 50 51 #define VISL_NAME "visl" 52 #define VISL_M2M_NQUEUES 2 53 54 #define TPG_STR_BUF_SZ 2048 55 56 extern unsigned int visl_transtime_ms; 57 58 struct visl_ctrls { 59 const struct visl_ctrl_desc *ctrls; 60 unsigned int num_ctrls; 61 }; 62 63 struct visl_coded_format_desc { 64 u32 pixelformat; 65 struct v4l2_frmsize_stepwise frmsize; 66 const struct visl_ctrls *ctrls; 67 unsigned int num_decoded_fmts; 68 const u32 *decoded_fmts; 69 }; 70 71 extern const struct visl_coded_format_desc visl_coded_fmts[]; 72 extern const size_t num_coded_fmts; 73 74 enum { 75 V4L2_M2M_SRC = 0, 76 V4L2_M2M_DST = 1, 77 }; 78 79 extern unsigned int visl_debug; 80 #define dprintk(dev, fmt, arg...) \ 81 v4l2_dbg(1, visl_debug, &(dev)->v4l2_dev, "%s: " fmt, __func__, ## arg) 82 83 extern int visl_dprintk_frame_start; 84 extern unsigned int visl_dprintk_nframes; 85 extern bool keep_bitstream_buffers; 86 extern int bitstream_trace_frame_start; 87 extern unsigned int bitstream_trace_nframes; 88 89 #define frame_dprintk(dev, current, fmt, arg...) \ 90 do { \ 91 if (visl_dprintk_frame_start > -1 && \ 92 (current) >= visl_dprintk_frame_start && \ 93 (current) < visl_dprintk_frame_start + visl_dprintk_nframes) \ 94 dprintk(dev, fmt, ## arg); \ 95 } while (0) \ 96 97 struct visl_q_data { 98 unsigned int sequence; 99 }; 100 101 struct visl_dev { 102 struct v4l2_device v4l2_dev; 103 struct video_device vfd; 104 #ifdef CONFIG_MEDIA_CONTROLLER 105 struct media_device mdev; 106 #endif 107 108 struct mutex dev_mutex; 109 110 struct v4l2_m2m_dev *m2m_dev; 111 112 #ifdef CONFIG_VISL_DEBUGFS 113 struct dentry *debugfs_root; 114 struct dentry *bitstream_debugfs; 115 struct list_head bitstream_blobs; 116 117 /* Protects the "blob" list */ 118 struct mutex bitstream_lock; 119 #endif 120 }; 121 122 enum visl_codec { 123 VISL_CODEC_NONE, 124 VISL_CODEC_FWHT, 125 VISL_CODEC_MPEG2, 126 VISL_CODEC_VP8, 127 VISL_CODEC_VP9, 128 VISL_CODEC_H264, 129 VISL_CODEC_HEVC, 130 }; 131 132 struct visl_blob { 133 struct list_head list; 134 struct dentry *dentry; 135 struct debugfs_blob_wrapper blob; 136 }; 137 138 struct visl_ctx { 139 struct v4l2_fh fh; 140 struct visl_dev *dev; 141 struct v4l2_ctrl_handler hdl; 142 143 struct mutex vb_mutex; 144 145 struct visl_q_data q_data[VISL_M2M_NQUEUES]; 146 enum visl_codec current_codec; 147 148 const struct visl_coded_format_desc *coded_format_desc; 149 150 struct v4l2_format coded_fmt; 151 struct v4l2_format decoded_fmt; 152 153 struct tpg_data tpg; 154 u64 capture_streamon_jiffies; 155 char *tpg_str_buf; 156 }; 157 158 struct visl_ctrl_desc { 159 struct v4l2_ctrl_config cfg; 160 }; 161 162 static inline struct visl_ctx *visl_file_to_ctx(struct file *file) 163 { 164 return container_of(file->private_data, struct visl_ctx, fh); 165 } 166 167 static inline struct visl_ctx *visl_v4l2fh_to_ctx(struct v4l2_fh *v4l2_fh) 168 { 169 return container_of(v4l2_fh, struct visl_ctx, fh); 170 } 171 172 void *visl_find_control_data(struct visl_ctx *ctx, u32 id); 173 struct v4l2_ctrl *visl_find_control(struct visl_ctx *ctx, u32 id); 174 u32 visl_control_num_elems(struct visl_ctx *ctx, u32 id); 175 176 #endif /* _VISL_H_ */ 177