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Message-ID: <20140723092525.5170.25926.stgit@hegdevasant.in.ibm.com>
Date: Wed, 23 Jul 2014 14:55:45 +0530
From: Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 2/2] powerpc/powernv: Interface to add opal dump region
PowerNV platform is capable of capturing host memory region when system
crashes (because of host/firmware). We have new OPAL API to register
memory region to be capture when system crashes.
This patch adds support for new API and also registers kernel log buffer.
Signed-off-by: Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>
---
arch/powerpc/include/asm/opal.h | 12 +++++
arch/powerpc/platforms/powernv/Makefile | 2 -
arch/powerpc/platforms/powernv/opal-dump-region.c | 46 +++++++++++++++++++++
arch/powerpc/platforms/powernv/opal-wrappers.S | 1
arch/powerpc/platforms/powernv/opal.c | 2 +
5 files changed, 62 insertions(+), 1 deletion(-)
create mode 100644 arch/powerpc/platforms/powernv/opal-dump-region.c
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 0da1dbd..6b9c01e 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -147,6 +147,7 @@ struct opal_sg_list {
#define OPAL_SET_PARAM 90
#define OPAL_DUMP_RESEND 91
#define OPAL_DUMP_INFO2 94
+#define OPAL_REGISTER_DUMP_REGION 98
#ifndef __ASSEMBLY__
@@ -860,6 +861,7 @@ int64_t opal_get_param(uint64_t token, uint32_t param_id, uint64_t buffer,
int64_t opal_set_param(uint64_t token, uint32_t param_id, uint64_t buffer,
uint64_t length);
int64_t opal_sensor_read(uint32_t sensor_hndl, int token, __be32 *sensor_data);
+int64_t opal_register_dump_region(uint32_t id, uint64_t start, uint64_t end);
/* Internal functions */
extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
@@ -899,6 +901,7 @@ extern int opal_elog_init(void);
extern void opal_platform_dump_init(void);
extern void opal_sys_param_init(void);
extern void opal_msglog_init(void);
+extern void opal_dump_region_init(void);
extern int opal_machine_check(struct pt_regs *regs);
extern bool opal_mce_check_early_recovery(struct pt_regs *regs);
@@ -912,6 +915,15 @@ struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
unsigned long vmalloc_size);
void opal_free_sg_list(struct opal_sg_list *sg);
+/*
+ * Dump regions ids
+ * 0x01 - 0x7F : OPAL
+ * 0x80 - 0xFF : Kernel
+ */
+#define DUMP_REGION_HOST_START 0x80
+#define DUMP_REGION_LOG_BUF 0x80
+#define DUMP_REGION_HOST_END 0xFF
+
#endif /* __ASSEMBLY__ */
#endif /* __OPAL_H */
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 4ad227d..e2819aa 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -1,7 +1,7 @@
obj-y += setup.o opal-wrappers.o opal.o opal-async.o
obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
-obj-y += opal-msglog.o
+obj-y += opal-msglog.o opal-dump-region.o
obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
diff --git a/arch/powerpc/platforms/powernv/opal-dump-region.c b/arch/powerpc/platforms/powernv/opal-dump-region.c
new file mode 100644
index 0000000..2cce388
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-dump-region.c
@@ -0,0 +1,46 @@
+/*
+ * PowerNV OPAL dump memory region interface
+ *
+ * Copyright 2014 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/pagemap.h>
+#include <linux/printk.h>
+#include <asm/opal.h>
+
+/*
+ * Pass kernel address range (start, size) that will be included in
+ * system dump (collected by service processor whenever system crashes).
+ *
+ * @id : Memory region ID (see opal.h)
+ * @addr : Start address
+ * @size : size in bytes
+ */
+static int add_dump_region_entry(uint32_t id, void *addr, uint64_t size)
+{
+ __be32 be_id = cpu_to_be32(id);
+ __be64 be_addr = cpu_to_be64(__pa(addr));
+ __be64 be_size = cpu_to_be64(size);
+
+ return opal_register_dump_region(be_id, be_addr, be_size);
+}
+
+void __init opal_dump_region_init(void)
+{
+ void *addr;
+ uint64_t size;
+ int rc;
+
+ /* Register kernel log buffer */
+ addr = get_log_buf_addr();
+ size = get_log_buf_len();
+ rc = add_dump_region_entry(DUMP_REGION_LOG_BUF, addr, size);
+ if (rc)
+ pr_warn("DUMP: Failed to register kernel log buffer. "
+ "rc = %d\n", rc);
+}
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index 4abbff2..935c30a 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -146,3 +146,4 @@ OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);
OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
+OPAL_CALL(opal_register_dump_region, OPAL_REGISTER_DUMP_REGION);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 1999756..2834303 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -616,6 +616,8 @@ static int __init opal_init(void)
/* Create "opal" kobject under /sys/firmware */
rc = opal_sysfs_init();
if (rc == 0) {
+ /* Setup dump region interface */
+ opal_dump_region_init();
/* Setup error log interface */
rc = opal_elog_init();
/* Setup code update interface */
--
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