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From: Hari Bathini <hbathini@linux.ibm.com>
To: linuxppc-dev <linuxppc-dev@ozlabs.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.ibm.com>,
	Mahesh J Salgaonkar <mahesh@linux.ibm.com>,
	Vasant Hegde <hegdevasant@linux.ibm.com>,
	Oliver <oohall@gmail.com>, Nicholas Piggin <npiggin@gmail.com>,
	Daniel Axtens <dja@axtens.net>
Subject: [PATCH v5 16/31] powernv/fadump: process the crashdump by exporting it as /proc/vmcore
Date: Tue, 20 Aug 2019 17:36:05 +0530
Message-ID: <156630276507.8896.7987455476577127053.stgit@hbathini.in.ibm.com> (raw)
In-Reply-To: <156630261682.8896.3418665808003586786.stgit@hbathini.in.ibm.com>

Add support in the kernel to process the crash'ed kernel's memory
preserved during MPIPL and export it as /proc/vmcore file for the
userland scripts to filter and analyze it later.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
 arch/powerpc/platforms/powernv/opal-fadump.c |  165 ++++++++++++++++++++++++++
 1 file changed, 163 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/opal-fadump.c b/arch/powerpc/platforms/powernv/opal-fadump.c
index a755705..10f6086 100644
--- a/arch/powerpc/platforms/powernv/opal-fadump.c
+++ b/arch/powerpc/platforms/powernv/opal-fadump.c
@@ -14,6 +14,7 @@
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <linux/mm.h>
+#include <linux/crash_dump.h>
 
 #include <asm/page.h>
 #include <asm/opal.h>
@@ -21,6 +22,7 @@
 #include "../../kernel/fadump-common.h"
 #include "opal-fadump.h"
 
+static const struct opal_fadump_mem_struct *opal_fdm_active;
 static struct opal_fadump_mem_struct *opal_fdm;
 
 static int opal_fadump_unregister(struct fw_dump *fadump_conf);
@@ -41,6 +43,37 @@ static void opal_fadump_update_config(struct fw_dump *fadump_conf,
 	fadump_conf->fadumphdr_addr = fdm->fadumphdr_addr;
 }
 
+/*
+ * This function is called in the capture kernel to get configuration details
+ * from metadata setup by the first kernel.
+ */
+static void opal_fadump_get_config(struct fw_dump *fadump_conf,
+				   const struct opal_fadump_mem_struct *fdm)
+{
+	int i;
+
+	if (!fadump_conf->dump_active)
+		return;
+
+	fadump_conf->boot_memory_size = 0;
+
+	pr_debug("Boot memory regions:\n");
+	for (i = 0; i < fdm->region_cnt; i++) {
+		pr_debug("\t%d. base: 0x%llx, size: 0x%llx\n",
+			 (i + 1), fdm->rgn[i].src, fdm->rgn[i].size);
+
+		fadump_conf->boot_memory_size += fdm->rgn[i].size;
+	}
+
+	/*
+	 * Start address of reserve dump area (permanent reservation) for
+	 * re-registering FADump after dump capture.
+	 */
+	fadump_conf->reserve_dump_area_start = fdm->rgn[0].dest;
+
+	opal_fadump_update_config(fadump_conf, fdm);
+}
+
 /* Initialize kernel metadata */
 static void opal_fadump_init_metadata(struct opal_fadump_mem_struct *fdm)
 {
@@ -215,24 +248,114 @@ static void opal_fadump_cleanup(struct fw_dump *fadump_conf)
 		pr_warn("Could not reset (%llu) kernel metadata tag!\n", ret);
 }
 
+/*
+ * Convert CPU state data saved at the time of crash into ELF notes.
+ */
+static int __init opal_fadump_build_cpu_notes(struct fw_dump *fadump_conf)
+{
+	u32 num_cpus, *note_buf;
+	struct fadump_crash_info_header *fdh = NULL;
+
+	num_cpus = 1;
+	/* Allocate buffer to hold cpu crash notes. */
+	fadump_conf->cpu_notes_buf_size = num_cpus * sizeof(note_buf_t);
+	fadump_conf->cpu_notes_buf_size =
+		PAGE_ALIGN(fadump_conf->cpu_notes_buf_size);
+	note_buf = fadump_cpu_notes_buf_alloc(fadump_conf->cpu_notes_buf_size);
+	if (!note_buf) {
+		pr_err("Failed to allocate 0x%lx bytes for cpu notes buffer\n",
+		       fadump_conf->cpu_notes_buf_size);
+		return -ENOMEM;
+	}
+	fadump_conf->cpu_notes_buf = __pa(note_buf);
+
+	pr_debug("Allocated buffer for cpu notes of size %ld at %p\n",
+		 (num_cpus * sizeof(note_buf_t)), note_buf);
+
+	if (fadump_conf->fadumphdr_addr)
+		fdh = __va(fadump_conf->fadumphdr_addr);
+
+	if (fdh && (fdh->crashing_cpu != FADUMP_CPU_UNKNOWN)) {
+		note_buf = fadump_regs_to_elf_notes(note_buf, &(fdh->regs));
+		final_note(note_buf);
+
+		pr_debug("Updating elfcore header (%llx) with cpu notes\n",
+			 fdh->elfcorehdr_addr);
+		fadump_update_elfcore_header(fadump_conf,
+					     __va(fdh->elfcorehdr_addr));
+	}
+
+	return 0;
+}
+
 static int __init opal_fadump_process(struct fw_dump *fadump_conf)
 {
-	return -EINVAL;
+	struct fadump_crash_info_header *fdh;
+	int rc = 0;
+
+	if (!opal_fdm_active || !fadump_conf->fadumphdr_addr)
+		return -EINVAL;
+
+	/* Validate the fadump crash info header */
+	fdh = __va(fadump_conf->fadumphdr_addr);
+	if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) {
+		pr_err("Crash info header is not valid.\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * TODO: To build cpu notes, find a way to map PIR to logical id.
+	 *       Also, we may need different method for pseries and powernv.
+	 *       The currently booted kernel could have a different PIR to
+	 *       logical id mapping. So, try saving info of previous kernel's
+	 *       paca to get the right PIR to logical id mapping.
+	 */
+	rc = opal_fadump_build_cpu_notes(fadump_conf);
+	if (rc)
+		return rc;
+
+	/*
+	 * We are done validating dump info and elfcore header is now ready
+	 * to be exported. set elfcorehdr_addr so that vmcore module will
+	 * export the elfcore header through '/proc/vmcore'.
+	 */
+	elfcorehdr_addr = fdh->elfcorehdr_addr;
+
+	return rc;
 }
 
 static void opal_fadump_region_show(struct fw_dump *fadump_conf,
 				    struct seq_file *m)
 {
 	int i;
-	const struct opal_fadump_mem_struct *fdm_ptr = opal_fdm;
+	const struct opal_fadump_mem_struct *fdm_ptr;
 	u64 dumped_bytes = 0;
 
+	if (fadump_conf->dump_active)
+		fdm_ptr = opal_fdm_active;
+	else
+		fdm_ptr = opal_fdm;
+
 	for (i = 0; i < fdm_ptr->region_cnt; i++) {
+		/*
+		 * Only regions that are registered for MPIPL
+		 * would have dump data.
+		 */
+		if ((fadump_conf->dump_active) &&
+		    (i < fdm_ptr->registered_regions))
+			dumped_bytes = fdm_ptr->rgn[i].size;
+
 		seq_printf(m, "DUMP: Src: %#016llx, Dest: %#016llx, ",
 			   fdm_ptr->rgn[i].src, fdm_ptr->rgn[i].dest);
 		seq_printf(m, "Size: %#llx, Dumped: %#llx bytes\n",
 			   fdm_ptr->rgn[i].size, dumped_bytes);
 	}
+
+	/* Dump is active. Show reserved area start address. */
+	if (fadump_conf->dump_active) {
+		seq_printf(m, "\nMemory above %#016lx is reserved for saving crash dump\n",
+			   fadump_conf->reserve_dump_area_start);
+	}
 }
 
 static void opal_fadump_trigger(struct fadump_crash_info_header *fdh,
@@ -264,6 +387,7 @@ static struct fadump_ops opal_fadump_ops = {
 int __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, ulong node)
 {
 	unsigned long dn;
+	const __be32 *prop;
 
 	/*
 	 * Check if Firmware-Assisted Dump is supported. if yes, check
@@ -283,5 +407,42 @@ int __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, ulong node)
 	fadump_conf->ops		= &opal_fadump_ops;
 	fadump_conf->fadump_supported	= 1;
 
+	/*
+	 * Check if dump has been initiated on last reboot.
+	 */
+	prop = of_get_flat_dt_prop(dn, "mpipl-boot", NULL);
+	if (prop) {
+		u64 addr = 0;
+		s64 ret;
+		const struct opal_fadump_mem_struct *r_opal_fdm_active;
+
+		ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_KERNEL, &addr);
+		if ((ret != OPAL_SUCCESS) || !addr) {
+			pr_err("Failed to get Kernel metadata (%lld)\n", ret);
+			return 1;
+		}
+
+		addr = be64_to_cpu(addr);
+		pr_debug("Kernel metadata addr: %llx\n", addr);
+
+		opal_fdm_active = __va(addr);
+		r_opal_fdm_active = (void *)addr;
+		if (r_opal_fdm_active->version != OPAL_FADUMP_VERSION) {
+			pr_err("FADump active but version (%u) unsupported!\n",
+			       r_opal_fdm_active->version);
+			return 1;
+		}
+
+		/* Kernel regions not registered with f/w for MPIPL */
+		if (r_opal_fdm_active->registered_regions == 0) {
+			opal_fdm_active = NULL;
+			return 1;
+		}
+
+		pr_info("Firmware-assisted dump is active.\n");
+		fadump_conf->dump_active = 1;
+		opal_fadump_get_config(fadump_conf, r_opal_fdm_active);
+	}
+
 	return 1;
 }


  parent reply index

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 12:04 [PATCH v5 00/31] Add FADump support on PowerNV platform Hari Bathini
2019-08-20 12:04 ` [PATCH v5 01/31] powerpc/fadump: move internal macros/definitions to a new header Hari Bathini
2019-09-03 11:09   ` Michael Ellerman
2019-09-03 16:05     ` Hari Bathini
2019-08-20 12:04 ` [PATCH v5 02/31] powerpc/fadump: move internal code to a new file Hari Bathini
2019-09-03 11:09   ` Michael Ellerman
2019-09-03 16:05     ` Hari Bathini
2019-09-04  9:02       ` Mahesh Jagannath Salgaonkar
2019-09-04 18:26         ` Hari Bathini
2019-08-20 12:04 ` [PATCH v5 03/31] powerpc/fadump: Improve fadump documentation Hari Bathini
2019-08-20 12:04 ` [PATCH v5 04/31] pseries/fadump: move rtas specific definitions to platform code Hari Bathini
2019-08-20 12:04 ` [PATCH v5 05/31] pseries/fadump: introduce callbacks for platform specific operations Hari Bathini
2019-09-03 11:10   ` Michael Ellerman
2019-09-03 16:06     ` Hari Bathini
2019-09-06  6:39       ` Hari Bathini
2019-08-20 12:04 ` [PATCH v5 06/31] pseries/fadump: define register/un-register callback functions Hari Bathini
2019-09-03 11:10   ` Michael Ellerman
2019-09-03 17:15     ` Hari Bathini
2019-08-20 12:04 ` [PATCH v5 07/31] powerpc/fadump: release all the memory above boot memory size Hari Bathini
2019-09-03 11:10   ` Michael Ellerman
2019-09-03 16:27     ` Hari Bathini
2019-08-20 12:05 ` [PATCH v5 08/31] pseries/fadump: move out platform specific support from generic code Hari Bathini
2019-08-20 12:05 ` [PATCH v5 09/31] powerpc/fadump: use FADump instead of fadump for how it is pronounced Hari Bathini
2019-08-20 12:05 ` [PATCH v5 10/31] opal: add MPIPL interface definitions Hari Bathini
2019-09-03 11:10   ` Michael Ellerman
2019-09-03 16:28     ` Hari Bathini
2019-09-04 11:03       ` Michael Ellerman
2019-09-04 11:05   ` Michael Ellerman
2019-08-20 12:05 ` [PATCH v5 11/31] powernv/fadump: add fadump support on powernv Hari Bathini
2019-09-03 11:10   ` Michael Ellerman
2019-09-03 16:31     ` Hari Bathini
2019-09-04 14:33       ` Hari Bathini
2019-09-05  3:11         ` Michael Ellerman
2019-08-20 12:05 ` [PATCH v5 12/31] powernv/fadump: register kernel metadata address with opal Hari Bathini
2019-09-04 11:25   ` Michael Ellerman
2019-08-20 12:05 ` [PATCH v5 13/31] powernv/fadump: reset metadata address during clean up Hari Bathini
2019-08-27 12:00   ` Hari Bathini
2019-08-20 12:05 ` [PATCH v5 14/31] powernv/fadump: define register/un-register callback functions Hari Bathini
2019-09-05  4:15   ` Michael Ellerman
2019-09-05  7:23   ` Michael Ellerman
2019-09-05  9:54     ` Hari Bathini
2019-08-20 12:05 ` [PATCH v5 15/31] powernv/fadump: support copying multiple kernel boot memory regions Hari Bathini
2019-09-04 11:30   ` Michael Ellerman
2019-09-04 20:20     ` Hari Bathini
2019-09-05  3:13       ` Michael Ellerman
2019-08-20 12:06 ` Hari Bathini [this message]
2019-09-04 11:42   ` [PATCH v5 16/31] powernv/fadump: process the crashdump by exporting it as /proc/vmcore Michael Ellerman
2019-09-04 21:01     ` Hari Bathini
2019-08-20 12:06 ` [PATCH v5 17/31] powernv/fadump: Warn before processing partial crashdump Hari Bathini
2019-09-04 11:48   ` Michael Ellerman
2019-08-20 12:06 ` [PATCH v5 18/31] powernv/fadump: handle invalidation of crashdump and re-registraion Hari Bathini
2019-08-20 12:06 ` [PATCH v5 19/31] powerpc/fadump: Update documentation about OPAL platform support Hari Bathini
2019-09-04 11:51   ` Michael Ellerman
2019-09-04 12:08     ` Oliver O'Halloran
2019-09-05  3:15       ` Michael Ellerman
2019-08-20 12:06 ` [PATCH v5 20/31] powerpc/fadump: use smaller offset while finding memory for reservation Hari Bathini
2019-09-04 11:54   ` Michael Ellerman
2019-08-20 12:06 ` [PATCH v5 21/31] powernv/fadump: process architected register state data provided by firmware Hari Bathini
2019-09-04 12:20   ` Michael Ellerman
2019-09-09 13:23     ` Hari Bathini
2019-09-09 15:33       ` Oliver O'Halloran
2019-09-10  8:48         ` Hari Bathini
2019-09-10 14:05           ` Michael Ellerman
2019-09-10 16:10             ` Hari Bathini
2019-08-20 12:06 ` [PATCH v5 22/31] powerpc/fadump: make crash memory ranges array allocation generic Hari Bathini
2019-08-20 12:06 ` [PATCH v5 23/31] powerpc/fadump: consider reserved ranges while releasing memory Hari Bathini
2019-08-20 12:07 ` [PATCH v5 24/31] powerpc/fadump: improve how crashed kernel's memory is reserved Hari Bathini
2019-08-20 12:07 ` [PATCH v5 25/31] powernv/fadump: add support to preserve crash data on FADUMP disabled kernel Hari Bathini
2019-08-20 12:07 ` [PATCH v5 26/31] powerpc/fadump: update documentation about CONFIG_PRESERVE_FA_DUMP Hari Bathini
2019-08-20 12:07 ` [PATCH v5 27/31] powernv/opalcore: export /sys/firmware/opal/core for analysing opal crashes Hari Bathini
2019-08-20 12:07 ` [PATCH v5 28/31] powernv/opalcore: provide an option to invalidate /sys/firmware/opal/core file Hari Bathini
2019-08-20 12:07 ` [PATCH v5 29/31] powerpc/fadump: consider f/w load area Hari Bathini
2019-08-20 12:07 ` [PATCH v5 30/31] powernv/fadump: update documentation about option to release opalcore Hari Bathini
2019-08-20 12:07 ` [PATCH v5 31/31] powernv/fadump: support holes in kernel boot memory area Hari Bathini

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