Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/g…

…it/aegl/linux-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  [IA64] tioca: Fix assignment from incompatible pointer warnings
  [IA64] mca.c: Fix cast from integer to pointer warning
  [IA64] setup.c Typo fix "Architechtuallly"
  [IA64] Add CONFIG_MISC_DEVICES=y to configs that need it.
  [IA64] disable interrupts at end of ia64_mca_cpe_int_handler()
  [IA64] Add DMA_ERROR_CODE define.
  pstore: fix build warning for unused return value from sysfs_create_file
  pstore: X86 platform interface using ACPI/APEI/ERST
  pstore: new filesystem interface to platform persistent storage

Documentation/ABI/testing/pstore

@@ -0,0 +1,35 @@
+Where:		/dev/pstore/...
+Date:		January 2011
+Kernel Version: 2.6.38
+Contact:	[email protected]
+Description:	Generic interface to platform dependent persistent storage.
+
+		Platforms that provide a mechanism to preserve some data
+		across system reboots can register with this driver to
+		provide a generic interface to show records captured in
+		the dying moments.  In the case of a panic the last part
+		of the console log is captured, but other interesting
+		data can also be saved.
+
+		# mount -t pstore - /dev/pstore
+
+		$ ls -l /dev/pstore
+		total 0
+		-r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-erst-1
+
+		Different users of this interface will result in different
+		filename prefixes.  Currently two are defined:
+
+		"dmesg"	- saved console log
+		"mce"	- architecture dependent data from fatal h/w error
+
+		Once the information in a file has been read, removing
+		the file will signal to the underlying persistent storage
+		device that it can reclaim the space for later re-use.
+
+		$ rm /dev/pstore/dmesg-erst-1
+
+		The expectation is that all files in /dev/pstore
+		will be saved elsewhere and erased from persistent store
+		soon after boot to free up space ready for the next
+		catastrophe.

Documentation/ABI/testing/sysfs-fs-pstore

@@ -0,0 +1,7 @@
+What:		/sys/fs/pstore/kmsg_bytes
+Date:		January 2011
+Kernel Version: 2.6.38
+Contact:	"Tony Luck" <[email protected]>
+Description:
+		Controls amount of console log that will be saved
+		to persistent store on oops/panic.

arch/ia64/configs/generic_defconfig

@@ -233,3 +233,4 @@ CONFIG_CRYPTO_PCBC=m
 CONFIG_CRYPTO_MD5=y
 # CONFIG_CRYPTO_ANSI_CPRNG is not set
 CONFIG_CRC_T10DIF=y
+CONFIG_MISC_DEVICES=y

arch/ia64/configs/gensparse_defconfig

@@ -208,3 +208,4 @@ CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_MUTEXES=y
 CONFIG_CRYPTO_MD5=y
+CONFIG_MISC_DEVICES=y

arch/ia64/include/asm/dma-mapping.h

@@ -12,6 +12,8 @@
 
 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
 
+#define DMA_ERROR_CODE 0
+
 extern struct dma_map_ops *dma_ops;
 extern struct ia64_machine_vector ia64_mv;
 extern void set_iommu_machvec(void);

arch/ia64/kernel/mca.c

@@ -582,6 +582,8 @@ ia64_mca_cpe_int_handler (int cpe_irq, void *arg)
 	/* Get the CPE error record and log it */
 	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CPE);
 
+	local_irq_disable();
+
 	return IRQ_HANDLED;
 }
 
@@ -1859,7 +1861,8 @@ ia64_mca_cpu_init(void *cpu_data)
 			data = mca_bootmem();
 			first_time = 0;
 		} else
-			data = __get_free_pages(GFP_KERNEL, get_order(sz));
+			data = (void *)__get_free_pages(GFP_KERNEL,
+							get_order(sz));
 		if (!data)
 			panic("Could not allocate MCA memory for cpu %d\n",
 					cpu);

arch/ia64/sn/kernel/setup.c

@@ -592,7 +592,7 @@ void __cpuinit sn_cpu_init(void)
 	/*
 	 * Don't check status. The SAL call is not supported on all PROMs
 	 * but a failure is harmless.
-	 * Architechtuallly, cpu_init is always called twice on cpu 0. We
+	 * Architecturally, cpu_init is always called twice on cpu 0. We
 	 * should set cpu_number on cpu 0 once.
 	 */
 	if (cpuid == 0) {

arch/ia64/sn/pci/tioca_provider.c

@@ -509,7 +509,7 @@ tioca_dma_unmap(struct pci_dev *pdev, dma_addr_t bus_addr, int dir)
  * use the GART mapped mode.
  */
 static u64
-tioca_dma_map(struct pci_dev *pdev, u64 paddr, size_t byte_count, int dma_flags)
+tioca_dma_map(struct pci_dev *pdev, unsigned long paddr, size_t byte_count, int dma_flags)
 {
 	u64 mapaddr;
 

drivers/acpi/apei/Kconfig

@@ -1,5 +1,6 @@
 config ACPI_APEI
 	bool "ACPI Platform Error Interface (APEI)"
+	select PSTORE
 	depends on X86
 	help
 	  APEI allows to report errors (for example from the chipset)

drivers/acpi/apei/erst.c

@@ -34,6 +34,7 @@
 #include <linux/cper.h>
 #include <linux/nmi.h>
 #include <linux/hardirq.h>
+#include <linux/pstore.h>
 #include <acpi/apei.h>
 
 #include "apei-internal.h"
@@ -781,13 +782,136 @@ static int erst_check_table(struct acpi_table_erst *erst_tab)
 	return 0;
 }
 
+static size_t erst_reader(u64 *id, enum pstore_type_id *type,
+		       struct timespec *time);
+static u64 erst_writer(enum pstore_type_id type, size_t size);
+
+static struct pstore_info erst_info = {
+	.owner		= THIS_MODULE,
+	.name		= "erst",
+	.read		= erst_reader,
+	.write		= erst_writer,
+	.erase		= erst_clear
+};
+
+#define CPER_CREATOR_PSTORE						\
+	UUID_LE(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c,	\
+		0x64, 0x90, 0xb8, 0x9d)
+#define CPER_SECTION_TYPE_DMESG						\
+	UUID_LE(0xc197e04e, 0xd545, 0x4a70, 0x9c, 0x17, 0xa5, 0x54,	\
+		0x94, 0x19, 0xeb, 0x12)
+#define CPER_SECTION_TYPE_MCE						\
+	UUID_LE(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96,	\
+		0x04, 0x4a, 0x38, 0xfc)
+
+struct cper_pstore_record {
+	struct cper_record_header hdr;
+	struct cper_section_descriptor sec_hdr;
+	char data[];
+} __packed;
+
+static size_t erst_reader(u64 *id, enum pstore_type_id *type,
+		       struct timespec *time)
+{
+	int rc;
+	ssize_t len;
+	unsigned long flags;
+	u64 record_id;
+	struct cper_pstore_record *rcd = (struct cper_pstore_record *)
+					(erst_info.buf - sizeof(*rcd));
+
+	if (erst_disable)
+		return -ENODEV;
+
+	raw_spin_lock_irqsave(&erst_lock, flags);
+skip:
+	rc = __erst_get_next_record_id(&record_id);
+	if (rc) {
+		raw_spin_unlock_irqrestore(&erst_lock, flags);
+		return rc;
+	}
+	/* no more record */
+	if (record_id == APEI_ERST_INVALID_RECORD_ID) {
+		raw_spin_unlock_irqrestore(&erst_lock, flags);
+		return 0;
+	}
+
+	len = __erst_read(record_id, &rcd->hdr, sizeof(*rcd) +
+			  erst_erange.size);
+	if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0)
+		goto skip;
+	raw_spin_unlock_irqrestore(&erst_lock, flags);
+
+	*id = record_id;
+	if (uuid_le_cmp(rcd->sec_hdr.section_type,
+			CPER_SECTION_TYPE_DMESG) == 0)
+		*type = PSTORE_TYPE_DMESG;
+	else if (uuid_le_cmp(rcd->sec_hdr.section_type,
+			     CPER_SECTION_TYPE_MCE) == 0)
+		*type = PSTORE_TYPE_MCE;
+	else
+		*type = PSTORE_TYPE_UNKNOWN;
+
+	if (rcd->hdr.validation_bits & CPER_VALID_TIMESTAMP)
+		time->tv_sec = rcd->hdr.timestamp;
+	else
+		time->tv_sec = 0;
+	time->tv_nsec = 0;
+
+	return len - sizeof(*rcd);
+}
+
+static u64 erst_writer(enum pstore_type_id type, size_t size)
+{
+	struct cper_pstore_record *rcd = (struct cper_pstore_record *)
+					(erst_info.buf - sizeof(*rcd));
+
+	memset(rcd, 0, sizeof(*rcd));
+	memcpy(rcd->hdr.signature, CPER_SIG_RECORD, CPER_SIG_SIZE);
+	rcd->hdr.revision = CPER_RECORD_REV;
+	rcd->hdr.signature_end = CPER_SIG_END;
+	rcd->hdr.section_count = 1;
+	rcd->hdr.error_severity = CPER_SEV_FATAL;
+	/* timestamp valid. platform_id, partition_id are invalid */
+	rcd->hdr.validation_bits = CPER_VALID_TIMESTAMP;
+	rcd->hdr.timestamp = get_seconds();
+	rcd->hdr.record_length = sizeof(*rcd) + size;
+	rcd->hdr.creator_id = CPER_CREATOR_PSTORE;
+	rcd->hdr.notification_type = CPER_NOTIFY_MCE;
+	rcd->hdr.record_id = cper_next_record_id();
+	rcd->hdr.flags = CPER_HW_ERROR_FLAGS_PREVERR;
+
+	rcd->sec_hdr.section_offset = sizeof(*rcd);
+	rcd->sec_hdr.section_length = size;
+	rcd->sec_hdr.revision = CPER_SEC_REV;
+	/* fru_id and fru_text is invalid */
+	rcd->sec_hdr.validation_bits = 0;
+	rcd->sec_hdr.flags = CPER_SEC_PRIMARY;
+	switch (type) {
+	case PSTORE_TYPE_DMESG:
+		rcd->sec_hdr.section_type = CPER_SECTION_TYPE_DMESG;
+		break;
+	case PSTORE_TYPE_MCE:
+		rcd->sec_hdr.section_type = CPER_SECTION_TYPE_MCE;
+		break;
+	default:
+		return -EINVAL;
+	}
+	rcd->sec_hdr.section_severity = CPER_SEV_FATAL;
+
+	erst_write(&rcd->hdr);
+
+	return rcd->hdr.record_id;
+}
+
 static int __init erst_init(void)
 {
 	int rc = 0;
 	acpi_status status;
 	struct apei_exec_context ctx;
 	struct apei_resources erst_resources;
 	struct resource *r;
+	char *buf;
 
 	if (acpi_disabled)
 		goto err;
@@ -854,6 +978,18 @@ static int __init erst_init(void)
 	if (!erst_erange.vaddr)
 		goto err_release_erange;
 
+	buf = kmalloc(erst_erange.size, GFP_KERNEL);
+	mutex_init(&erst_info.buf_mutex);
+	if (buf) {
+		erst_info.buf = buf + sizeof(struct cper_pstore_record);
+		erst_info.bufsize = erst_erange.size -
+				    sizeof(struct cper_pstore_record);
+		if (pstore_register(&erst_info)) {
+			pr_info(ERST_PFX "Could not register with persistent store\n");
+			kfree(buf);
+		}
+	}
+
 	pr_info(ERST_PFX
 	"Error Record Serialization Table (ERST) support is initialized.\n");
 

fs/Kconfig

@@ -187,6 +187,7 @@ source "fs/omfs/Kconfig"
 source "fs/hpfs/Kconfig"
 source "fs/qnx4/Kconfig"
 source "fs/romfs/Kconfig"
+source "fs/pstore/Kconfig"
 source "fs/sysv/Kconfig"
 source "fs/ufs/Kconfig"
 source "fs/exofs/Kconfig"

fs/Makefile

@@ -123,3 +123,4 @@ obj-$(CONFIG_BTRFS_FS)		+= btrfs/
 obj-$(CONFIG_GFS2_FS)           += gfs2/
 obj-$(CONFIG_EXOFS_FS)          += exofs/
 obj-$(CONFIG_CEPH_FS)		+= ceph/
+obj-$(CONFIG_PSTORE)		+= pstore/

fs/pstore/Kconfig

@@ -0,0 +1,13 @@
+config PSTORE
+	bool "Persistant store support"
+	default n
+	help
+	   This option enables generic access to platform level
+	   persistent storage via "pstore" filesystem that can
+	   be mounted as /dev/pstore.  Only useful if you have
+	   a platform level driver that registers with pstore to
+	   provide the data, so you probably should just go say "Y"
+	   (or "M") to a platform specific persistent store driver
+	   (e.g. ACPI_APEI on X86) which will select this for you.
+	   If you don't have a platform persistent store driver,
+	   say N.

fs/pstore/Makefile

@@ -0,0 +1,7 @@
+#
+# Makefile for the linux pstorefs routines.
+#
+
+obj-y += pstore.o
+
+pstore-objs += inode.o platform.o