From patchwork Tue May 30 12:29:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunfei Dong X-Patchwork-Id: 687102 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98560C77B7A for ; Tue, 30 May 2023 12:30:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230285AbjE3MaE (ORCPT ); Tue, 30 May 2023 08:30:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231550AbjE3M3x (ORCPT ); Tue, 30 May 2023 08:29:53 -0400 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B73C196; Tue, 30 May 2023 05:29:37 -0700 (PDT) X-UUID: 956e65aefee511ed9cb5633481061a41-20230530 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=PGg28bYGdlybOKDSuJ+kuoeR+i7xQtYULFyTtxLx0fs=; b=XLM0V2iEyshMPR9++6WFQXjK50vzSlRtT0RHiRlxBAt1pDYzwIBUvomOfamN33bs0PpFd2GFfEpwtgrkG/GUYwYdBUG2DtPYqgP54TSpXFp14jw4/wXNrq6nbmK7QEddhamztlygICcr+t83zlPVZUSYOvjr1aHSX7BvUJ+Jbf0=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.25, REQID:539f4852-9243-4f0e-9c4f-069c0b194765, IP:0, U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-25 X-CID-META: VersionHash:d5b0ae3, CLOUDID:e9f4d13c-de1e-4348-bc35-c96f92f1dcbb, B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:11|1,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-UUID: 956e65aefee511ed9cb5633481061a41-20230530 Received: from mtkmbs10n2.mediatek.inc [(172.21.101.183)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1937495261; Tue, 30 May 2023 20:29:12 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Tue, 30 May 2023 20:29:11 +0800 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Tue, 30 May 2023 20:29:10 +0800 From: Yunfei Dong To: Chen-Yu Tsai , Nicolas Dufresne , Hans Verkuil , AngeloGioacchino Del Regno , Benjamin Gaignard , =?utf-8?q?N=C3=ADcolas?= =?utf-8?q?_F_=2E_R_=2E_A_=2E_Prado?= , Nathan Hebert CC: Yunfei Dong , Hsin-Yi Wang , Fritz Koenig , Daniel Vetter , Steve Cho , , , , , , Subject: [PATCH v6, 1/8] media: mediatek: vcodec: Add debugfs interface to get debug information Date: Tue, 30 May 2023 20:29:01 +0800 Message-ID: <20230530122908.19267-2-yunfei.dong@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230530122908.19267-1-yunfei.dong@mediatek.com> References: <20230530122908.19267-1-yunfei.dong@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This will be useful when debugging specific issues related to kernel in running status. Signed-off-by: Yunfei Dong Reviewed-by: AngeloGioacchino Del Regno --- .../media/platform/mediatek/vcodec/Makefile | 6 ++++ .../mediatek/vcodec/mtk_vcodec_dbgfs.c | 33 +++++++++++++++++++ .../mediatek/vcodec/mtk_vcodec_dbgfs.h | 32 ++++++++++++++++++ .../mediatek/vcodec/mtk_vcodec_dec_drv.c | 2 ++ .../platform/mediatek/vcodec/mtk_vcodec_drv.h | 4 +++ 5 files changed, 77 insertions(+) create mode 100644 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c create mode 100644 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h diff --git a/drivers/media/platform/mediatek/vcodec/Makefile b/drivers/media/platform/mediatek/vcodec/Makefile index d24b452d0fb3..d9979d0259c1 100644 --- a/drivers/media/platform/mediatek/vcodec/Makefile +++ b/drivers/media/platform/mediatek/vcodec/Makefile @@ -45,3 +45,9 @@ endif ifneq ($(CONFIG_VIDEO_MEDIATEK_VCODEC_SCP),) mtk-vcodec-common-y += mtk_vcodec_fw_scp.o endif + +ifneq ($(CONFIG_DEBUG_FS),) +obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-dbgfs.o + +mtk-vcodec-dbgfs-y := mtk_vcodec_dbgfs.o +endif \ No newline at end of file diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c new file mode 100644 index 000000000000..fb9edd379af5 --- /dev/null +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c @@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2023 MediaTek Inc. + * Author: Yunfei Dong + */ + +#include + +#include "mtk_vcodec_dbgfs.h" +#include "mtk_vcodec_drv.h" +#include "mtk_vcodec_util.h" + +void mtk_vcodec_dbgfs_init(struct mtk_vcodec_dev *vcodec_dev) +{ + struct dentry *vcodec_root; + + vcodec_dev->dbgfs.vcodec_root = debugfs_create_dir("vcodec-dec", NULL); + if (IS_ERR(vcodec_dev->dbgfs.vcodec_root)) + dev_err(&vcodec_dev->plat_dev->dev, "create vcodec dir err:%d\n", + IS_ERR(vcodec_dev->dbgfs.vcodec_root)); + + vcodec_root = vcodec_dev->dbgfs.vcodec_root; +} +EXPORT_SYMBOL_GPL(mtk_vcodec_dbgfs_init); + +void mtk_vcodec_dbgfs_deinit(struct mtk_vcodec_dev *vcodec_dev) +{ + debugfs_remove_recursive(vcodec_dev->dbgfs.vcodec_root); +} +EXPORT_SYMBOL_GPL(mtk_vcodec_dbgfs_deinit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Mediatek video codec driver"); diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h new file mode 100644 index 000000000000..5eec2211cbbe --- /dev/null +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 MediaTek Inc. + * Author: Yunfei Dong + */ + +#ifndef __MTK_VCODEC_DBGFS_H__ +#define __MTK_VCODEC_DBGFS_H__ + +struct mtk_vcodec_dev; + +/** + * struct mtk_vcodec_dbgfs - dbgfs information + * @vcodec_root: vcodec dbgfs entry + */ +struct mtk_vcodec_dbgfs { + struct dentry *vcodec_root; +}; + +#if defined(CONFIG_DEBUG_FS) +void mtk_vcodec_dbgfs_init(struct mtk_vcodec_dev *vcodec_dev); +void mtk_vcodec_dbgfs_deinit(struct mtk_vcodec_dev *vcodec_dev); +#else +static inline void mtk_vcodec_dbgfs_init(struct mtk_vcodec_dev *vcodec_dev) +{ +} + +static inline void mtk_vcodec_dbgfs_deinit(struct mtk_vcodec_dev *vcodec_dev) +{ +} +#endif +#endif diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c index 7bd300341cf0..51a9af193f92 100644 --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c @@ -422,6 +422,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev) mtk_v4l2_debug(0, "media registered as /dev/media%d", vfd_dec->minor); } + mtk_vcodec_dbgfs_init(dev); mtk_v4l2_debug(0, "decoder registered as /dev/video%d", vfd_dec->minor); return 0; @@ -497,6 +498,7 @@ static void mtk_vcodec_dec_remove(struct platform_device *pdev) if (dev->vfd_dec) video_unregister_device(dev->vfd_dec); + mtk_vcodec_dbgfs_deinit(dev); v4l2_device_unregister(&dev->v4l2_dev); if (!dev->vdec_pdata->is_subdev_supported) pm_runtime_disable(dev->pm.dev); diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h index 1f4c5774ec47..3ec027ec8192 100644 --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h @@ -16,6 +16,7 @@ #include #include +#include "mtk_vcodec_dbgfs.h" #include "mtk_vcodec_util.h" #include "vdec_msg_queue.h" @@ -470,6 +471,7 @@ struct mtk_vcodec_enc_pdata { * @dec_active_cnt: used to mark whether need to record register value * @vdec_racing_info: record register value * @dec_racing_info_mutex: mutex lock used for inner racing mode + * @dbgfs: debug log related information */ struct mtk_vcodec_dev { struct v4l2_device v4l2_dev; @@ -519,6 +521,8 @@ struct mtk_vcodec_dev { u32 vdec_racing_info[132]; /* Protects access to vdec_racing_info data */ struct mutex dec_racing_info_mutex; + + struct mtk_vcodec_dbgfs dbgfs; }; static inline struct mtk_vcodec_ctx *fh_to_ctx(struct v4l2_fh *fh) From patchwork Tue May 30 12:29:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunfei Dong X-Patchwork-Id: 687104 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A043CC7EE32 for ; Tue, 30 May 2023 12:29:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231222AbjE3M36 (ORCPT ); Tue, 30 May 2023 08:29:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231556AbjE3M3y (ORCPT ); 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Tue, 30 May 2023 20:29:13 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Tue, 30 May 2023 20:29:12 +0800 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Tue, 30 May 2023 20:29:11 +0800 From: Yunfei Dong To: Chen-Yu Tsai , Nicolas Dufresne , Hans Verkuil , AngeloGioacchino Del Regno , Benjamin Gaignard , =?utf-8?q?N=C3=ADcolas?= =?utf-8?q?_F_=2E_R_=2E_A_=2E_Prado?= , Nathan Hebert CC: Yunfei Dong , Hsin-Yi Wang , Fritz Koenig , Daniel Vetter , Steve Cho , , , , , , Subject: [PATCH v6,2/8] media: mediatek: vcodec: Add debug params to control different log level Date: Tue, 30 May 2023 20:29:02 +0800 Message-ID: <20230530122908.19267-3-yunfei.dong@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230530122908.19267-1-yunfei.dong@mediatek.com> References: <20230530122908.19267-1-yunfei.dong@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add parameter mtk_vcodec_dbg to open each codec log. Add parameter mtk_v4l2_dbg_level to open each instance log according to the parameter value. Signed-off-by: Yunfei Dong Reviewed-by: AngeloGioacchino Del Regno --- .../mediatek/vcodec/mtk_vcodec_dbgfs.c | 2 ++ .../mediatek/vcodec/mtk_vcodec_util.c | 8 ++++++ .../mediatek/vcodec/mtk_vcodec_util.h | 26 ++++++++++++++++--- 3 files changed, 33 insertions(+), 3 deletions(-) diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c index fb9edd379af5..b5093e4e4aa2 100644 --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c @@ -20,6 +20,8 @@ void mtk_vcodec_dbgfs_init(struct mtk_vcodec_dev *vcodec_dev) IS_ERR(vcodec_dev->dbgfs.vcodec_root)); vcodec_root = vcodec_dev->dbgfs.vcodec_root; + debugfs_create_x32("mtk_v4l2_dbg_level", 0644, vcodec_root, &mtk_v4l2_dbg_level); + debugfs_create_x32("mtk_vcodec_dbg", 0644, vcodec_root, &mtk_vcodec_dbg); } EXPORT_SYMBOL_GPL(mtk_vcodec_dbgfs_init); diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c index ace78c4b5b9e..f214e6f67005 100644 --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c @@ -13,6 +13,14 @@ #include "mtk_vcodec_drv.h" #include "mtk_vcodec_util.h" +#if defined(CONFIG_DEBUG_FS) +int mtk_vcodec_dbg; +EXPORT_SYMBOL(mtk_vcodec_dbg); + +int mtk_v4l2_dbg_level; +EXPORT_SYMBOL(mtk_v4l2_dbg_level); +#endif + void __iomem *mtk_vcodec_get_reg_addr(struct mtk_vcodec_ctx *data, unsigned int reg_idx) { diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h index 71956627a0e2..587aa817e7f4 100644 --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h @@ -35,15 +35,35 @@ struct mtk_vcodec_dev; pr_err("[MTK_VCODEC][ERROR][%d]: " fmt "\n", \ ((struct mtk_vcodec_ctx *)(h)->ctx)->id, ##args) +#if defined(CONFIG_DEBUG_FS) +extern int mtk_v4l2_dbg_level; +extern int mtk_vcodec_dbg; -#define mtk_v4l2_debug(level, fmt, args...) pr_debug(fmt, ##args) +#define mtk_v4l2_debug(level, fmt, args...) \ + do { \ + if (mtk_v4l2_dbg_level >= level) \ + pr_debug("[MTK_V4L2] %s, %d: " fmt "\n", \ + __func__, __LINE__, ##args); \ + } while (0) -#define mtk_v4l2_debug_enter() mtk_v4l2_debug(3, "+") -#define mtk_v4l2_debug_leave() mtk_v4l2_debug(3, "-") +#define mtk_vcodec_debug(h, fmt, args...) \ + do { \ + if (mtk_vcodec_dbg) \ + dev_dbg(&(((struct mtk_vcodec_ctx *)(h)->ctx)->dev->plat_dev->dev), \ + "[MTK_VCODEC][%d]: %s, %d " fmt "\n", \ + ((struct mtk_vcodec_ctx *)(h)->ctx)->id, \ + __func__, __LINE__, ##args); \ + } while (0) +#else +#define mtk_v4l2_debug(level, fmt, args...) pr_debug(fmt, ##args) #define mtk_vcodec_debug(h, fmt, args...) \ pr_debug("[MTK_VCODEC][%d]: " fmt "\n", \ ((struct mtk_vcodec_ctx *)(h)->ctx)->id, ##args) +#endif + +#define mtk_v4l2_debug_enter() mtk_v4l2_debug(3, "+") +#define mtk_v4l2_debug_leave() mtk_v4l2_debug(3, "-") #define mtk_vcodec_debug_enter(h) mtk_vcodec_debug(h, "+") #define mtk_vcodec_debug_leave(h) mtk_vcodec_debug(h, "-") From patchwork Tue May 30 12:29:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunfei Dong X-Patchwork-Id: 687101 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B50AC7EE2F for ; Tue, 30 May 2023 12:30:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231454AbjE3MaI (ORCPT ); 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Tue, 30 May 2023 20:29:19 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Tue, 30 May 2023 20:29:18 +0800 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Tue, 30 May 2023 20:29:17 +0800 From: Yunfei Dong To: Chen-Yu Tsai , Nicolas Dufresne , Hans Verkuil , AngeloGioacchino Del Regno , Benjamin Gaignard , =?utf-8?q?N=C3=ADcolas?= =?utf-8?q?_F_=2E_R_=2E_A_=2E_Prado?= , Nathan Hebert CC: Yunfei Dong , Hsin-Yi Wang , Fritz Koenig , Daniel Vetter , Steve Cho , , , , , , Subject: [PATCH v6,8/8] media: mediatek: vcodec: Add dbgfs help function Date: Tue, 30 May 2023 20:29:08 +0800 Message-ID: <20230530122908.19267-9-yunfei.dong@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230530122908.19267-1-yunfei.dong@mediatek.com> References: <20230530122908.19267-1-yunfei.dong@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Getting dbgfs help information with command "echo -help > vdec" or "echo > vdec". Signed-off-by: Yunfei Dong Reviewed-by: AngeloGioacchino Del Regno --- .../mediatek/vcodec/mtk_vcodec_dbgfs.c | 24 ++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c index 688884db651e..2151c3967684 100644 --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c @@ -52,6 +52,23 @@ static void mtk_vdec_dbgfs_get_format_type(struct mtk_vcodec_ctx *ctx, char *buf *used += curr_len; } +static void mtk_vdec_dbgfs_get_help(char *buf, int *used, int total) +{ + int curr_len; + + curr_len = snprintf(buf + *used, total - *used, + "help: (1: echo -'info' > vdec 2: cat vdec)\n"); + *used += curr_len; + + curr_len = snprintf(buf + *used, total - *used, + "\t-picinfo: get resolution\n"); + *used += curr_len; + + curr_len = snprintf(buf + *used, total - *used, + "\t-format: get output & capture queue format\n"); + *used += curr_len; +} + static ssize_t mtk_vdec_dbgfs_write(struct file *filp, const char __user *ubuf, size_t count, loff_t *ppos) { @@ -83,6 +100,11 @@ static ssize_t mtk_vdec_dbgfs_read(struct file *filp, char __user *ubuf, if (!buf) return -ENOMEM; + if (strstr(dbgfs->dbgfs_buf, "-help") || dbgfs->buf_size == 1) { + mtk_vdec_dbgfs_get_help(buf, &used_len, total_len); + goto read_buffer; + } + if (strstr(dbgfs->dbgfs_buf, "-picinfo")) dbgfs_index[MTK_VDEC_DBGFS_PICINFO] = true; @@ -109,7 +131,7 @@ static ssize_t mtk_vdec_dbgfs_read(struct file *filp, char __user *ubuf, mtk_vdec_dbgfs_get_format_type(ctx, buf, &used_len, total_len); } mutex_unlock(&dbgfs->dbgfs_lock); - +read_buffer: ret = simple_read_from_buffer(ubuf, count, ppos, buf, used_len); kfree(buf); return ret;