1 files changed, 144 insertions, 52 deletions

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index d2275c5a2311..91ea00a0f61d 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Debugfs support for hosts and cards
  *
  * Copyright (C) 2008 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 #include <linux/moduleparam.h>
 #include <linux/export.h>
@@ -15,9 +12,12 @@
 #include <linux/slab.h>
 #include <linux/stat.h>
 #include <linux/fault-inject.h>
+#include <linux/time.h>
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
 
 #include "core.h"
 #include "card.h"
@@ -29,6 +29,7 @@
 static DECLARE_FAULT_ATTR(fail_default_attr);
 static char *fail_request;
 module_param(fail_request, charp, 0);
+MODULE_PARM_DESC(fail_request, "default fault injection attributes");
 
 #endif /* CONFIG_FAIL_MMC_REQUEST */
 
@@ -222,53 +223,159 @@ static int mmc_clock_opt_set(void *data, u64 val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
+DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
 	"%llu\n");
 
+static int mmc_err_state_get(void *data, u64 *val)
+{
+	struct mmc_host *host = data;
+	int i;
+
+	if (!host)
+		return -EINVAL;
+
+	*val = 0;
+	for (i = 0; i < MMC_ERR_MAX; i++) {
+		if (host->err_stats[i]) {
+			*val = 1;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
+
+static int mmc_err_stats_show(struct seq_file *file, void *data)
+{
+	struct mmc_host *host = file->private;
+	const char *desc[MMC_ERR_MAX] = {
+		[MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",
+		[MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred",
+		[MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred",
+		[MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred",
+		[MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred",
+		[MMC_ERR_ADMA] = "ADMA Error Occurred",
+		[MMC_ERR_TUNING] = "Tuning Error Occurred",
+		[MMC_ERR_CMDQ_RED] = "CMDQ RED Errors",
+		[MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors",
+		[MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors",
+		[MMC_ERR_REQ_TIMEOUT] = "Request Timedout",
+		[MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout",
+		[MMC_ERR_ICE_CFG] = "ICE Config Errors",
+		[MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors",
+		[MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors",
+	};
+	int i;
+
+	for (i = 0; i < MMC_ERR_MAX; i++) {
+		if (desc[i])
+			seq_printf(file, "# %s:\t %d\n",
+					desc[i], host->err_stats[i]);
+	}
+
+	return 0;
+}
+
+static int mmc_err_stats_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mmc_err_stats_show, inode->i_private);
+}
+
+static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf,
+				   size_t cnt, loff_t *ppos)
+{
+	struct mmc_host *host = filp->f_mapping->host->i_private;
+
+	pr_debug("%s: Resetting MMC error statistics\n", __func__);
+	memset(host->err_stats, 0, sizeof(host->err_stats));
+
+	return cnt;
+}
+
+static const struct file_operations mmc_err_stats_fops = {
+	.open	= mmc_err_stats_open,
+	.read	= seq_read,
+	.write	= mmc_err_stats_write,
+	.release = single_release,
+};
+
+static int mmc_caps_get(void *data, u64 *val)
+{
+	*val = *(u32 *)data;
+	return 0;
+}
+
+static int mmc_caps_set(void *data, u64 val)
+{
+	u32 *caps = data;
+	u32 diff = *caps ^ val;
+	u32 allowed = MMC_CAP_AGGRESSIVE_PM |
+		      MMC_CAP_SD_HIGHSPEED |
+		      MMC_CAP_MMC_HIGHSPEED |
+		      MMC_CAP_UHS |
+		      MMC_CAP_DDR |
+		      MMC_CAP_4_BIT_DATA |
+		      MMC_CAP_8_BIT_DATA |
+		      MMC_CAP_CMD23;
+
+	if (diff & ~allowed)
+		return -EINVAL;
+
+	*caps = val;
+
+	return 0;
+}
+
+static int mmc_caps2_set(void *data, u64 val)
+{
+	u32 allowed = MMC_CAP2_HSX00_1_8V |
+		      MMC_CAP2_HSX00_1_2V |
+		      MMC_CAP2_CQE |
+		      MMC_CAP2_CQE_DCMD;
+	u32 *caps = data;
+	u32 diff = *caps ^ val;
+
+	if (diff & ~allowed)
+		return -EINVAL;
+
+	*caps = val;
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps_fops, mmc_caps_get, mmc_caps_set,
+			 "0x%08llx\n");
+DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps2_fops, mmc_caps_get, mmc_caps2_set,
+			 "0x%08llx\n");
+
 void mmc_add_host_debugfs(struct mmc_host *host)
 {
 	struct dentry *root;
 
 	root = debugfs_create_dir(mmc_hostname(host), NULL);
-	if (IS_ERR(root))
-		/* Don't complain -- debugfs just isn't enabled */
-		return;
-	if (!root)
-		/* Complain -- debugfs is enabled, but it failed to
-		 * create the directory. */
-		goto err_root;
-
 	host->debugfs_root = root;
 
-	if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
-		goto err_node;
-
-	if (!debugfs_create_x32("caps", S_IRUSR, root, &host->caps))
-		goto err_node;
+	debugfs_create_file("ios", 0400, root, host, &mmc_ios_fops);
+	debugfs_create_file("caps", 0600, root, &host->caps, &mmc_caps_fops);
+	debugfs_create_file("caps2", 0600, root, &host->caps2,
+			    &mmc_caps2_fops);
+	debugfs_create_file_unsafe("clock", 0600, root, host,
+				   &mmc_clock_fops);
 
-	if (!debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2))
-		goto err_node;
-
-	if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
-			&mmc_clock_fops))
-		goto err_node;
+	debugfs_create_file_unsafe("err_state", 0600, root, host,
+			    &mmc_err_state);
+	debugfs_create_file("err_stats", 0600, root, host,
+			    &mmc_err_stats_fops);
 
 #ifdef CONFIG_FAIL_MMC_REQUEST
 	if (fail_request)
 		setup_fault_attr(&fail_default_attr, fail_request);
 	host->fail_mmc_request = fail_default_attr;
-	if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
-					     root,
-					     &host->fail_mmc_request)))
-		goto err_node;
+	fault_create_debugfs_attr("fail_mmc_request", root,
+				  &host->fail_mmc_request);
 #endif
-	return;
-
-err_node:
-	debugfs_remove_recursive(root);
-	host->debugfs_root = NULL;
-err_root:
-	dev_err(&host->class_dev, "failed to initialize debugfs\n");
 }
 
 void mmc_remove_host_debugfs(struct mmc_host *host)
@@ -285,25 +392,10 @@ void mmc_add_card_debugfs(struct mmc_card *card)
 		return;
 
 	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
-	if (IS_ERR(root))
-		/* Don't complain -- debugfs just isn't enabled */
-		return;
-	if (!root)
-		/* Complain -- debugfs is enabled, but it failed to
-		 * create the directory. */
-		goto err;
-
 	card->debugfs_root = root;
 
-	if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
-		goto err;
-
-	return;
-
-err:
-	debugfs_remove_recursive(root);
-	card->debugfs_root = NULL;
-	dev_err(&card->dev, "failed to initialize debugfs\n");
+	debugfs_create_x32("state", 0400, root, &card->state);
+	debugfs_create_x32("quirks", 0400, root, &card->quirks);
 }
 
 void mmc_remove_card_debugfs(struct mmc_card *card)