linux-kernel - [PATCH v1 10/11] blkoops: add interface for dirver to get information of blkoops

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Date:   Mon, 20 Jan 2020 09:03:52 +0800
From:   WeiXiong Liao <liaoweixiong@...winnertech.com>
To:     Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        WeiXiong Liao <liaoweixiong@...winnertech.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org
Subject: [PATCH v1 10/11] blkoops: add interface for dirver to get information of blkoops

It's one of a series of patches for adaptive to MTD device.

MTD device need to check size of recorder and get mtddev index to verify
which mtd device to use. All it needs is defined in blkoops. So, there
should be a interface for MTD driver to get all information it need.

Signed-off-by: WeiXiong Liao <liaoweixiong@...winnertech.com>
---
 fs/pstore/blkoops.c     | 47 ++++++++++++++++++++++++++++++++++++-----------
 include/linux/blkoops.h | 10 ++++++++++
 2 files changed, 46 insertions(+), 11 deletions(-)

diff --git a/fs/pstore/blkoops.c b/fs/pstore/blkoops.c
index 6b74189e5820..a2f1e31488bb 100644
--- a/fs/pstore/blkoops.c
+++ b/fs/pstore/blkoops.c
@@ -117,6 +117,20 @@
 #define DEFAULT_BLKDEV ""
 #endif
 
+#define check_size(name, defsize, alignsize) ({			\
+	long _##name_ = (name);					\
+	if ((name) < 0)						\
+		_##name_ = (defsize);				\
+	_##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024);	\
+	if (_##name_ & (alignsize - 1)) {			\
+		pr_info(#name " must align to %d\n",		\
+				(alignsize));			\
+		_##name_ = ALIGN(name, alignsize);		\
+	}							\
+	_##name_;						\
+})
+
+
 /**
  * register device to blkoops
  *
@@ -148,18 +162,10 @@ int blkoops_register_device(struct blkoops_device *bo_dev)
 		bo_dev->flags = BLKOOPS_DEV_SUPPORT_ALL;
 #define verify_size(name, defsize, alignsize, enable) {			\
 		long _##name_;						\
-		if (!(enable))						\
-			_##name_ = 0;					\
-		else if ((name) >= 0)					\
-			_##name_ = (name);				\
+		if (enable)						\
+			_##name_ = check_size(name, defsize, alignsize);\
 		else							\
-			_##name_ = (defsize);				\
-		_##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024);	\
-		if (_##name_ & (alignsize - 1)) {			\
-			pr_info(#name " must align to %d\n",		\
-					(alignsize));			\
-			_##name_ = ALIGN(name, alignsize);		\
-		}							\
+			_##name_ = 0;					\
 		name = _##name_ / 1024;					\
 		bzinfo->name = _##name_;				\
 	}
@@ -460,6 +466,25 @@ int blkoops_blkdev_info(dev_t *devt, sector_t *nr_sects, sector_t *start_sect)
 }
 EXPORT_SYMBOL_GPL(blkoops_blkdev_info);
 
+/* get information of blkoops */
+int  blkoops_info(struct blkoops_info *info)
+{
+	if (!blkdev[0] && strlen(DEFAULT_BLKDEV))
+		snprintf(blkdev, 80, "%s", DEFAULT_BLKDEV);
+
+	memcpy(info->device, blkdev, 80);
+	info->dump_oops = !!(dump_oops < 0 ? DEFAULT_DUMP_OOPS : dump_oops);
+
+	info->dmesg_size = check_size(dmesg_size, DEFAULT_DMESG_SIZE, 4096);
+	info->pmsg_size = check_size(pmsg_size, DEFAULT_PMSG_SIZE, 4096);
+	info->ftrace_size = check_size(ftrace_size, DEFAULT_FTRACE_SIZE, 4096);
+	info->console_size = check_size(console_size, DEFAULT_CONSOLE_SIZE,
+			4096);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(blkoops_info);
+
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("WeiXiong Liao <liaoweixiong@...winnertech.com>");
 MODULE_DESCRIPTION("Wrapper for Pstore BLK with Oops logger");
diff --git a/include/linux/blkoops.h b/include/linux/blkoops.h
index 11cb3036ad5f..ea56f3f92360 100644
--- a/include/linux/blkoops.h
+++ b/include/linux/blkoops.h
@@ -81,4 +81,14 @@ int  blkoops_register_blkdev(unsigned int major, unsigned int flags,
 void blkoops_unregister_blkdev(unsigned int major);
 int  blkoops_blkdev_info(dev_t *devt, sector_t *nr_sects, sector_t *start_sect);
 
+struct blkoops_info {
+	int dump_oops;
+	char device[80];
+	unsigned long dmesg_size;
+	unsigned long pmsg_size;
+	unsigned long console_size;
+	unsigned long ftrace_size;
+};
+int  blkoops_info(struct blkoops_info *info);
+
 #endif
-- 
1.9.1