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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/include/linux/pstore.h
....@@ -1,3 +1,4 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  * Persistent Storage - pstore.h
34  *
....@@ -5,19 +6,6 @@
56  *
67  * This code is the generic layer to export data records from platform
78  * level persistent storage via a file system.
8
- *
9
- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License version 2 as
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- *  published by the Free Software Foundation.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
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- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
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- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
219  */
2210 #ifndef _LINUX_PSTORE_H
2311 #define _LINUX_PSTORE_H
....@@ -32,13 +20,19 @@
3220 
3321 struct module;
3422 
35
-/* pstore record types (see fs/pstore/inode.c for filename templates) */
23
+/*
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+ * pstore record types (see fs/pstore/platform.c for pstore_type_names[])
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+ * These values may be written to storage (see EFI vars backend), so
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+ * they are kind of an ABI. Be careful changing the mappings.
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+ */
3628 enum pstore_type_id {
29
+	/* Frontend storage types */
3730 	PSTORE_TYPE_DMESG	= 0,
3831 	PSTORE_TYPE_MCE		= 1,
3932 	PSTORE_TYPE_CONSOLE	= 2,
4033 	PSTORE_TYPE_FTRACE	= 3,
41
-	/* PPC64 partition types */
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+
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+	/* PPC64-specific partition types */
4236 	PSTORE_TYPE_PPC_RTAS	= 4,
4337 	PSTORE_TYPE_PPC_OF	= 5,
4438 	PSTORE_TYPE_PPC_COMMON	= 6,
....@@ -47,8 +41,13 @@
4741 #ifdef CONFIG_PSTORE_BOOT_LOG
4842 	PSTORE_TYPE_BOOT_LOG	= 9,
4943 #endif
50
-	PSTORE_TYPE_UNKNOWN	= 255
44
+
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+	/* End of the list */
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+	PSTORE_TYPE_MAX
5147 };
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+
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+const char *pstore_type_to_name(enum pstore_type_id type);
50
+enum pstore_type_id pstore_name_to_type(const char *name);
5251 
5352 struct pstore_info;
5453 /**
....@@ -88,7 +87,7 @@
8887 /**
8988  * struct pstore_info - backend pstore driver structure
9089  *
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- * @owner:	module which is repsonsible for this backend driver
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+ * @owner:	module which is responsible for this backend driver
9291  * @name:	name of the backend driver
9392  *
9493  * @buf_lock:	semaphore to serialize access to @buf
....@@ -100,6 +99,12 @@
10099  *
101100  * @read_mutex:	serializes @open, @read, @close, and @erase callbacks
102101  * @flags:	bitfield of frontends the backend can accept writes for
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+ * @max_reason:	Used when PSTORE_FLAGS_DMESG is set. Contains the
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+ *		kmsg_dump_reason enum value. KMSG_DUMP_UNDEF means
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+ *		"use existing kmsg_dump() filtering, based on the
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+ *		printk.always_kmsg_dump boot param" (which is either
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+ *		KMSG_DUMP_OOPS when false, or KMSG_DUMP_MAX when
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+ *		true); see printk.always_kmsg_dump for more details.
103108  * @data:	backend-private pointer passed back during callbacks
104109  *
105110  * Callbacks:
....@@ -174,7 +179,7 @@
174179  */
175180 struct pstore_info {
176181 	struct module	*owner;
177
-	char		*name;
182
+	const char	*name;
178183 
179184 	struct semaphore buf_lock;
180185 	char		*buf;
....@@ -183,6 +188,7 @@
183188 	struct mutex	read_mutex;
184189 
185190 	int		flags;
191
+	int		max_reason;
186192 	void		*data;
187193 
188194 	int		(*open)(struct pstore_info *psi);
....@@ -195,13 +201,14 @@
195201 };
196202 
197203 /* Supported frontends */
198
-#define PSTORE_FLAGS_DMESG	(1 << 0)
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-#define PSTORE_FLAGS_CONSOLE	(1 << 1)
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-#define PSTORE_FLAGS_FTRACE	(1 << 2)
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-#define PSTORE_FLAGS_PMSG	(1 << 3)
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+#define PSTORE_FLAGS_DMESG	BIT(0)
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+#define PSTORE_FLAGS_CONSOLE	BIT(1)
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+#define PSTORE_FLAGS_FTRACE	BIT(2)
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+#define PSTORE_FLAGS_PMSG	BIT(3)
202208 #ifdef CONFIG_PSTORE_BOOT_LOG
203
-#define PSTORE_FLAGS_BOOT_LOG	(1 << 4)
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+#define PSTORE_FLAGS_BOOT_LOG	BIT(4)
204210 #endif
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+
205212 extern int pstore_register(struct pstore_info *);
206213 extern void pstore_unregister(struct pstore_info *);
207214