[PATCH v4 05/25] pseries/fadump: introduce callbacks for platform specific operations

[Hari Bathini <hbathini@linux.ibm.com>]

Introduce callback functions for platform specific operations like
register, unregister, invalidate & such. Also, define place-holders
for the same on pSeries platform.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
 arch/powerpc/kernel/fadump-common.h          |   33 ++++++
 arch/powerpc/kernel/fadump.c                 |   47 +--------
 arch/powerpc/platforms/pseries/Makefile      |    1 
 arch/powerpc/platforms/pseries/rtas-fadump.c |  134 ++++++++++++++++++++++++++
 4 files changed, 171 insertions(+), 44 deletions(-)
 create mode 100644 arch/powerpc/platforms/pseries/rtas-fadump.c

diff --git a/arch/powerpc/kernel/fadump-common.h b/arch/powerpc/kernel/fadump-common.h
index 09d6161..020d582 100644
--- a/arch/powerpc/kernel/fadump-common.h
+++ b/arch/powerpc/kernel/fadump-common.h
@@ -50,6 +50,12 @@
 #define FADUMP_UNREGISTER		2
 #define FADUMP_INVALIDATE		3
 
+/* Firmware-Assited Dump platforms */
+enum fadump_platform_type {
+	FADUMP_PLATFORM_UNKNOWN = 0,
+	FADUMP_PLATFORM_PSERIES,
+};
+
 /*
  * Copy the ascii values for first 8 characters from a string into u64
  * variable at their respective indexes.
@@ -84,6 +90,9 @@ struct fad_crash_memory_ranges {
 	unsigned long long	size;
 };
 
+/* Platform specific callback functions */
+struct fadump_ops;
+
 /* Firmware-assisted dump configuration details. */
 struct fw_dump {
 	unsigned long	reserve_dump_area_start;
@@ -106,6 +115,21 @@ struct fw_dump {
 	unsigned long	dump_active:1;
 	unsigned long	dump_registered:1;
 	unsigned long	nocma:1;
+
+	enum fadump_platform_type	fadump_platform;
+	struct fadump_ops		*ops;
+};
+
+struct fadump_ops {
+	ulong	(*init_fadump_mem_struct)(struct fw_dump *fadump_config);
+	int	(*register_fadump)(struct fw_dump *fadump_config);
+	int	(*unregister_fadump)(struct fw_dump *fadump_config);
+	int	(*invalidate_fadump)(struct fw_dump *fadump_config);
+	int	(*process_fadump)(struct fw_dump *fadump_config);
+	void	(*fadump_region_show)(struct fw_dump *fadump_config,
+				      struct seq_file *m);
+	void	(*fadump_trigger)(struct fadump_crash_info_header *fdh,
+				  const char *msg);
 };
 
 /* Helper functions */
@@ -116,4 +140,13 @@ void fadump_update_elfcore_header(struct fw_dump *fadump_config, char *bufp);
 int is_fadump_boot_mem_contiguous(struct fw_dump *fadump_conf);
 int is_fadump_reserved_mem_contiguous(struct fw_dump *fadump_conf);
 
+#ifdef CONFIG_PPC_PSERIES
+extern int rtas_fadump_dt_scan(struct fw_dump *fadump_config, ulong node);
+#else
+static inline int rtas_fadump_dt_scan(struct fw_dump *fadump_config, ulong node)
+{
+	return 1;
+}
+#endif
+
 #endif /* __PPC64_FA_DUMP_INTERNAL_H__ */
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index f571cb3..a901ca1 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -112,24 +112,12 @@ static int __init fadump_cma_init(void) { return 1; }
 int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname,
 				      int depth, void *data)
 {
-	const __be32 *sections;
-	int i, num_sections;
-	int size;
-	const __be32 *token;
+	int ret;
 
 	if (depth != 1 || strcmp(uname, "rtas") != 0)
 		return 0;
 
-	/*
-	 * Check if Firmware Assisted dump is supported. if yes, check
-	 * if dump has been initiated on last reboot.
-	 */
-	token = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL);
-	if (!token)
-		return 1;
-
-	fw_dump.fadump_supported = 1;
-	fw_dump.ibm_configure_kernel_dump = be32_to_cpu(*token);
+	ret = rtas_fadump_dt_scan(&fw_dump, node);
 
 	/*
 	 * The 'ibm,kernel-dump' rtas node is present only if there is
@@ -139,36 +127,7 @@ int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname,
 	if (fdm_active)
 		fw_dump.dump_active = 1;
 
-	/* Get the sizes required to store dump data for the firmware provided
-	 * dump sections.
-	 * For each dump section type supported, a 32bit cell which defines
-	 * the ID of a supported section followed by two 32 bit cells which
-	 * gives teh size of the section in bytes.
-	 */
-	sections = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
-					&size);
-
-	if (!sections)
-		return 1;
-
-	num_sections = size / (3 * sizeof(u32));
-
-	for (i = 0; i < num_sections; i++, sections += 3) {
-		u32 type = (u32)of_read_number(sections, 1);
-
-		switch (type) {
-		case RTAS_FADUMP_CPU_STATE_DATA:
-			fw_dump.cpu_state_data_size =
-					of_read_ulong(&sections[1], 2);
-			break;
-		case RTAS_FADUMP_HPTE_REGION:
-			fw_dump.hpte_region_size =
-					of_read_ulong(&sections[1], 2);
-			break;
-		}
-	}
-
-	return 1;
+	return ret;
 }
 
 /*
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index ab3d59a..e248724 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_IBMVIO)		+= vio.o
 obj-$(CONFIG_IBMEBUS)		+= ibmebus.o
 obj-$(CONFIG_PAPR_SCM)		+= papr_scm.o
 obj-$(CONFIG_PPC_SPLPAR)	+= vphn.o
+obj-$(CONFIG_FA_DUMP)		+= rtas-fadump.o
 
 ifdef CONFIG_PPC_PSERIES
 obj-$(CONFIG_SUSPEND)		+= suspend.o
diff --git a/arch/powerpc/platforms/pseries/rtas-fadump.c b/arch/powerpc/platforms/pseries/rtas-fadump.c
new file mode 100644
index 0000000..9e7c9bf
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/rtas-fadump.c
@@ -0,0 +1,134 @@
+/*
+ * Firmware-Assisted Dump support on POWERVM platform.
+ *
+ * Copyright 2011, IBM Corporation
+ * Author: Mahesh Salgaonkar <mahesh@linux.ibm.com>
+ *
+ * Copyright 2019, IBM Corp.
+ * Author: Hari Bathini <hbathini@linux.ibm.com>
+ *
+ * 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.
+ */
+
+#undef DEBUG
+#define pr_fmt(fmt) "rtas fadump: " fmt
+
+#include <linux/string.h>
+#include <linux/memblock.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+#include <linux/crash_dump.h>
+
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/fadump.h>
+
+#include "../../kernel/fadump-common.h"
+#include "rtas-fadump.h"
+
+static ulong rtas_fadump_init_mem_struct(struct fw_dump *fadump_conf)
+{
+	return fadump_conf->reserve_dump_area_start;
+}
+
+static int rtas_fadump_register_fadump(struct fw_dump *fadump_conf)
+{
+	return -EIO;
+}
+
+static int rtas_fadump_unregister_fadump(struct fw_dump *fadump_conf)
+{
+	return -EIO;
+}
+
+static int rtas_fadump_invalidate_fadump(struct fw_dump *fadump_conf)
+{
+	return -EIO;
+}
+
+/*
+ * Validate and process the dump data stored by firmware before exporting
+ * it through '/proc/vmcore'.
+ */
+static int __init rtas_fadump_process_fadump(struct fw_dump *fadump_conf)
+{
+	return -EINVAL;
+}
+
+static void rtas_fadump_region_show(struct fw_dump *fadump_conf,
+				    struct seq_file *m)
+{
+}
+
+static void rtas_fadump_trigger(struct fadump_crash_info_header *fdh,
+				const char *msg)
+{
+	/* Call ibm,os-term rtas call to trigger firmware assisted dump */
+	rtas_os_term((char *)msg);
+}
+
+static struct fadump_ops rtas_fadump_ops = {
+	.init_fadump_mem_struct	= rtas_fadump_init_mem_struct,
+	.register_fadump	= rtas_fadump_register_fadump,
+	.unregister_fadump	= rtas_fadump_unregister_fadump,
+	.invalidate_fadump	= rtas_fadump_invalidate_fadump,
+	.process_fadump		= rtas_fadump_process_fadump,
+	.fadump_region_show	= rtas_fadump_region_show,
+	.fadump_trigger		= rtas_fadump_trigger,
+};
+
+int __init rtas_fadump_dt_scan(struct fw_dump *fadump_conf, ulong node)
+{
+	const __be32 *sections;
+	int i, num_sections;
+	int size;
+	const __be32 *token;
+
+	/*
+	 * Check if Firmware Assisted dump is supported. if yes, check
+	 * if dump has been initiated on last reboot.
+	 */
+	token = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL);
+	if (!token)
+		return 1;
+
+	fadump_conf->ibm_configure_kernel_dump = be32_to_cpu(*token);
+	fadump_conf->ops		= &rtas_fadump_ops;
+	fadump_conf->fadump_platform	= FADUMP_PLATFORM_PSERIES;
+	fadump_conf->fadump_supported	= 1;
+
+	/* Get the sizes required to store dump data for the firmware provided
+	 * dump sections.
+	 * For each dump section type supported, a 32bit cell which defines
+	 * the ID of a supported section followed by two 32 bit cells which
+	 * gives the size of the section in bytes.
+	 */
+	sections = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
+					&size);
+
+	if (!sections)
+		return 1;
+
+	num_sections = size / (3 * sizeof(u32));
+
+	for (i = 0; i < num_sections; i++, sections += 3) {
+		u32 type = (u32)of_read_number(sections, 1);
+
+		switch (type) {
+		case RTAS_FADUMP_CPU_STATE_DATA:
+			fadump_conf->cpu_state_data_size =
+					of_read_ulong(&sections[1], 2);
+			break;
+		case RTAS_FADUMP_HPTE_REGION:
+			fadump_conf->hpte_region_size =
+					of_read_ulong(&sections[1], 2);
+			break;
+		}
+	}
+
+	return 1;
+}