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From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	linux-sh@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH 05/13] pinctrl: sh-pfc: checker: Add check for enum ID conflicts
Date: Fri, 10 Jan 2020 14:19:19 +0100	[thread overview]
Message-ID: <20200110131927.1029-6-geert+renesas@glider.be> (raw)
In-Reply-To: <20200110131927.1029-1-geert+renesas@glider.be>

Add a helper to verify that enum IDs are unique, and use it to validate
the enum ID arrays in config register descriptors.

This exposes bugs like those fixed in:
  - commit 805f635703b2562b ("pinctrl: sh-pfc: r8a7778: Fix duplicate
    SDSELF_B and SD1_CLK_B"),
  - commit 884caadad128efad ("pinctrl: sh-pfc: sh7734: Fix duplicate
    TCLK1_B"),
  - commit 2a069a92811fb35b ("pinctrl: sh-pfc: sh7264: Fix Port K I/O
    Register 0 definition").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/pinctrl/sh-pfc/core.c | 49 +++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index 2edf6efe8dfe3fdf..f82f483b98a25da5 100644
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -727,11 +727,14 @@ static int sh_pfc_suspend_init(struct sh_pfc *pfc) { return 0; }
 
 #ifdef DEBUG
 #define SH_PFC_MAX_REGS		300
+#define SH_PFC_MAX_ENUMS	3000
 
 static unsigned int sh_pfc_errors __initdata = 0;
 static unsigned int sh_pfc_warnings __initdata = 0;
 static u32 *sh_pfc_regs __initdata = NULL;
 static u32 sh_pfc_num_regs __initdata = 0;
+static u16 *sh_pfc_enums __initdata = NULL;
+static u32 sh_pfc_num_enums __initdata = 0;
 
 #define sh_pfc_err(fmt, ...)					 \
 	do {							 \
@@ -781,6 +784,36 @@ static void __init sh_pfc_check_reg(const char *drvname, u32 reg)
 	sh_pfc_regs[sh_pfc_num_regs++] = reg;
 }
 
+static int __init __sh_pfc_check_enum(const char *drvname, u16 enum_id)
+{
+	unsigned int i;
+
+	for (i = 0; i < sh_pfc_num_enums; i++) {
+		if (enum_id == sh_pfc_enums[i])
+			return -EINVAL;
+	}
+
+	if (sh_pfc_num_enums == SH_PFC_MAX_ENUMS) {
+		pr_warn_once("%s: Please increase SH_PFC_MAX_ENUMS\n", drvname);
+		return 0;
+	}
+
+	sh_pfc_enums[sh_pfc_num_enums++] = enum_id;
+	return 0;
+}
+
+static void __init sh_pfc_check_reg_enums(const char *drvname, u32 reg,
+					  const u16 *enums, unsigned int n)
+{
+	unsigned int i;
+
+	for (i = 0; i < n; i++) {
+		if (enums[i] && __sh_pfc_check_enum(drvname, enums[i]))
+			sh_pfc_err("reg 0x%x enum_id %u conflict\n", reg,
+				   enums[i]);
+	}
+}
+
 static void __init sh_pfc_check_cfg_reg(const char *drvname,
 					const struct pinmux_cfg_reg *cfg_reg)
 {
@@ -789,8 +822,9 @@ static void __init sh_pfc_check_cfg_reg(const char *drvname,
 	sh_pfc_check_reg(drvname, cfg_reg->reg);
 
 	if (cfg_reg->field_width) {
-		/* Checked at build time */
-		return;
+		n = cfg_reg->reg_width / cfg_reg->field_width;
+		/* Skip field checks (done at build time) */
+		goto check_enum_ids;
 	}
 
 	for (i = 0, n = 0, rw = 0; (fw = cfg_reg->var_field_width[i]); i++) {
@@ -808,6 +842,9 @@ static void __init sh_pfc_check_cfg_reg(const char *drvname,
 	if (n != cfg_reg->nr_enum_ids)
 		sh_pfc_err("reg 0x%x: enum_ids[] has %u instead of %u values\n",
 			   cfg_reg->reg, cfg_reg->nr_enum_ids, n);
+
+check_enum_ids:
+	sh_pfc_check_reg_enums(drvname, cfg_reg->reg, cfg_reg->enum_ids, n);
 }
 
 static void __init sh_pfc_check_info(const struct sh_pfc_soc_info *info)
@@ -819,6 +856,7 @@ static void __init sh_pfc_check_info(const struct sh_pfc_soc_info *info)
 
 	pr_info("Checking %s\n", drvname);
 	sh_pfc_num_regs = 0;
+	sh_pfc_num_enums = 0;
 
 	/* Check pins */
 	for (i = 0; i < info->nr_pins; i++) {
@@ -898,6 +936,11 @@ static void __init sh_pfc_check_driver(const struct platform_driver *pdrv)
 	if (!sh_pfc_regs)
 		return;
 
+	sh_pfc_enums = kcalloc(SH_PFC_MAX_ENUMS, sizeof(*sh_pfc_enums),
+			      GFP_KERNEL);
+	if (!sh_pfc_enums)
+		goto free_regs;
+
 	pr_warn("Checking builtin pinmux tables\n");
 
 	for (i = 0; pdrv->id_table[i].name[0]; i++)
@@ -911,6 +954,8 @@ static void __init sh_pfc_check_driver(const struct platform_driver *pdrv)
 	pr_warn("Detected %u errors and %u warnings\n", sh_pfc_errors,
 		sh_pfc_warnings);
 
+	kfree(sh_pfc_enums);
+free_regs:
 	kfree(sh_pfc_regs);
 }
 
-- 
2.17.1


  parent reply	other threads:[~2020-01-10 13:19 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 13:19 [PATCH 00/13] pinctrl: sh-pfc: checker: Various improvements Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 01/13] pinctrl: sh-pfc: checker: Move data before code Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 02/13] pinctrl: sh-pfc: checker: Add helpers for reporting Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 03/13] pinctrl: sh-pfc: checker: Add helper for safe name comparison Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 04/13] pinctrl: sh-pfc: checker: Add check for config register conflicts Geert Uytterhoeven
2020-01-10 13:19 ` Geert Uytterhoeven [this message]
2020-01-10 13:19 ` [PATCH 06/13] pinctrl: sh-pfc: checker: Improve pin checks Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 07/13] pinctrl: sh-pfc: checker: Improve pin function checks Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 08/13] pinctrl: sh-pfc: checker: Improve pin group checks Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 09/13] pinctrl: sh-pfc: checker: Add drive strength register checks Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 10/13] pinctrl: sh-pfc: checker: Add bias " Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 11/13] pinctrl: sh-pfc: checker: Add ioctrl " Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 12/13] pinctrl: sh-pfc: checker: Add data " Geert Uytterhoeven
2020-01-10 13:19 ` [PATCH 13/13] pinctrl: sh-pfc: checker: Add function GPIO checks Geert Uytterhoeven
2020-01-10 13:22   ` Geert Uytterhoeven
2020-01-10 20:29 ` [PATCH 00/13] pinctrl: sh-pfc: checker: Various improvements Niklas Söderlund
2020-02-10 13:46   ` Geert Uytterhoeven

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