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Received: from AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) by DB9PR04MB9283.eurprd04.prod.outlook.com (2603:10a6:10:36d::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6838.24; Mon, 2 Oct 2023 18:38:15 +0000 Received: from AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::1774:e25f:f99:aca2]) by AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::1774:e25f:f99:aca2%4]) with mapi id 15.20.6813.027; Mon, 2 Oct 2023 18:38:15 +0000 From: Frank Li To: arnd@arndb.de, vkoul@kernel.org Cc: Frank.Li@nxp.com, bhe@redhat.com, dmaengine@vger.kernel.org, gregkh@linuxfoundation.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org, lkp@intel.com, oe-kbuild-all@lists.linux.dev, rafael@kernel.org Subject: [PATCH v5 1/3] debugfs_create_regset32() support 8/16 bit width registers Date: Mon, 2 Oct 2023 14:37:48 -0400 Message-Id: <20231002183750.552759-2-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231002183750.552759-1-Frank.Li@nxp.com> References: <20231002183750.552759-1-Frank.Li@nxp.com> X-ClientProxiedBy: BYAPR07CA0016.namprd07.prod.outlook.com (2603:10b6:a02:bc::29) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|DB9PR04MB9283:EE_ X-MS-Office365-Filtering-Correlation-Id: 843d7dfc-7c23-4c50-f680-08dbc376bd63 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Mon, 02 Oct 2023 11:38:37 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778676755206503957 X-GMAIL-MSGID: 1778682546246022459 Enhance the flexibility of `debugfs_create_regset32()` to support registers of various bit widths. The key changes are as follows: 1. Renamed '*reg32' and '*regset32' to '*reg' and '*regset' in relevant code to reflect that the register width is not limited to 32 bits. 2. Added 'size' and 'bigendian' fields to the `struct debugfs_reg` to allow for specifying the size and endianness of registers. These additions enable `debugfs_create_regset()` to support a wider range of register types. 3. When 'size' is set to 0, it signifies a 32-bit register. This change maintains compatibility with existing code that assumes 32-bit registers. Improve the versatility of `debugfs_create_regset()` and enable it to handle registers of different sizes and endianness, offering greater flexibility for debugging and monitoring. Signed-off-by: Frank Li --- fs/debugfs/file.c | 53 +++++++++++++++++++++++++++-------------- include/linux/debugfs.h | 17 +++++++++---- 2 files changed, 48 insertions(+), 22 deletions(-) diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index 87b3753aa4b1..62cc96bb6d72 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -1137,15 +1137,15 @@ EXPORT_SYMBOL_GPL(debugfs_create_u32_array); #ifdef CONFIG_HAS_IOMEM /* - * The regset32 stuff is used to print 32-bit registers using the + * The regset stuff is used to print 32-bit registers using the * seq_file utilities. We offer printing a register set in an already-opened - * sequential file or create a debugfs file that only prints a regset32. + * sequential file or create a debugfs file that only prints a regset. */ /** - * debugfs_print_regs32 - use seq_print to describe a set of registers + * debugfs_print_regs - use seq_print to describe a set of registers * @s: the seq_file structure being used to generate output - * @regs: an array if struct debugfs_reg32 structures + * @regs: an array if struct debugfs_reg structures * @nregs: the length of the above array * @base: the base address to be used in reading the registers * @prefix: a string to be prefixed to every output line @@ -1157,30 +1157,47 @@ EXPORT_SYMBOL_GPL(debugfs_create_u32_array); * because some peripherals have several blocks of identical registers, * for example configuration of dma channels */ -void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs, +void debugfs_print_regs(struct seq_file *s, const struct debugfs_reg *regs, int nregs, void __iomem *base, char *prefix) { + void __iomem *reg; + bool b; int i; for (i = 0; i < nregs; i++, regs++) { if (prefix) seq_printf(s, "%s", prefix); - seq_printf(s, "%s = 0x%08x\n", regs->name, - readl(base + regs->offset)); + + b = regs->bigendian; + reg = base + regs->offset; + + switch (regs->size) { + case sizeof(u8): + seq_printf(s, "%s = 0x%02x\n", regs->name, ioread8(reg)); + break; + case sizeof(u16): + seq_printf(s, "%s = 0x%04x\n", regs->name, + b ? ioread16be(reg) : ioread16(reg)); + break; + default: + seq_printf(s, "%s = 0x%08x\n", regs->name, + b ? ioread32be(reg) : ioread32(reg)); + } + if (seq_has_overflowed(s)) break; } } -EXPORT_SYMBOL_GPL(debugfs_print_regs32); +EXPORT_SYMBOL_GPL(debugfs_print_regs); -static int debugfs_regset32_show(struct seq_file *s, void *data) +static int debugfs_regset_show(struct seq_file *s, void *data) { - struct debugfs_regset32 *regset = s->private; + struct debugfs_regset *regset = s->private; if (regset->dev) pm_runtime_get_sync(regset->dev); - debugfs_print_regs32(s, regset->regs, regset->nregs, regset->base, ""); + debugfs_print_regs(s, regset->regs, regset->nregs, regset->base, ""); if (regset->dev) pm_runtime_put(regset->dev); @@ -1188,16 +1205,16 @@ static int debugfs_regset32_show(struct seq_file *s, void *data) return 0; } -DEFINE_SHOW_ATTRIBUTE(debugfs_regset32); +DEFINE_SHOW_ATTRIBUTE(debugfs_regset); /** - * debugfs_create_regset32 - create a debugfs file that returns register values + * debugfs_create_regset - create a debugfs file that returns register values * @name: a pointer to a string containing the name of the file to create. * @mode: the permission that the file should have * @parent: a pointer to the parent dentry for this file. This should be a * directory dentry if set. If this parameter is %NULL, then the * file will be created in the root of the debugfs filesystem. - * @regset: a pointer to a struct debugfs_regset32, which contains a pointer + * @regset: a pointer to a struct debugfs_regset, which contains a pointer * to an array of register definitions, the array size and the base * address where the register bank is to be found. * @@ -1205,13 +1222,13 @@ DEFINE_SHOW_ATTRIBUTE(debugfs_regset32); * the names and values of a set of 32-bit registers. If the @mode variable * is so set it can be read from. Writing is not supported. */ -void debugfs_create_regset32(const char *name, umode_t mode, +void debugfs_create_regset(const char *name, umode_t mode, struct dentry *parent, - struct debugfs_regset32 *regset) + struct debugfs_regset *regset) { - debugfs_create_file(name, mode, parent, regset, &debugfs_regset32_fops); + debugfs_create_file(name, mode, parent, regset, &debugfs_regset_fops); } -EXPORT_SYMBOL_GPL(debugfs_create_regset32); +EXPORT_SYMBOL_GPL(debugfs_create_regset); #endif /* CONFIG_HAS_IOMEM */ diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h index ea2d919fd9c7..247ae4217ea5 100644 --- a/include/linux/debugfs.h +++ b/include/linux/debugfs.h @@ -26,18 +26,24 @@ struct debugfs_blob_wrapper { unsigned long size; }; -struct debugfs_reg32 { +struct debugfs_reg { char *name; + int size; + int bigendian; unsigned long offset; }; -struct debugfs_regset32 { +#define debugfs_reg32 debugfs_reg + +struct debugfs_regset { const struct debugfs_reg32 *regs; int nregs; void __iomem *base; struct device *dev; /* Optional device for Runtime PM */ }; +#define debugfs_regset32 debugfs_regset + struct debugfs_u32_array { u32 *array; u32 n_elements; @@ -145,12 +151,15 @@ struct dentry *debugfs_create_blob(const char *name, umode_t mode, struct dentry *parent, struct debugfs_blob_wrapper *blob); -void debugfs_create_regset32(const char *name, umode_t mode, +void debugfs_create_regset(const char *name, umode_t mode, struct dentry *parent, struct debugfs_regset32 *regset); -void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs, +#define debugfs_create_regset32 debugfs_create_regset + +void debugfs_print_regs(struct seq_file *s, const struct debugfs_reg32 *regs, int nregs, void __iomem *base, char *prefix); +#define debugfs_print_regs32 debugfs_print_regs void debugfs_create_u32_array(const char *name, umode_t mode, struct dentry *parent,