Add basic callback functions for FADump on PowerNV platform.
Signed-off-by: Hari Bathini <hbath...@linux.ibm.com>
---
Changes in v6:
* Drop using unnecessary return type for platform specific DT scan function.
arch/powerpc/Kconfig | 5 +
arch/powerpc/include/asm/fadump-internal.h | 7 ++
arch/powerpc/kernel/fadump.c | 15 +++-
arch/powerpc/platforms/powernv/Makefile | 1
arch/powerpc/platforms/powernv/opal-fadump.c | 92 ++++++++++++++++++++++++++
5 files changed, 115 insertions(+), 5 deletions(-)
create mode 100644 arch/powerpc/platforms/powernv/opal-fadump.c
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d8dcd88..fc4ecfe 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -566,7 +566,7 @@ config CRASH_DUMP
config FA_DUMP
bool "Firmware-assisted dump"
- depends on PPC64 && PPC_RTAS
+ depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
select CRASH_CORE
select CRASH_DUMP
help
@@ -577,7 +577,8 @@ config FA_DUMP
is meant to be a kdump replacement offering robustness and
speed not possible without system firmware assistance.
- If unsure, say "N"
+ If unsure, say "y". Only special kernels like petitboot may
+ need to say "N" here.
config IRQ_ALL_CPUS
bool "Distribute interrupts on all CPUs by default"
diff --git a/arch/powerpc/include/asm/fadump-internal.h
b/arch/powerpc/include/asm/fadump-internal.h
index 8c0eb0f..8046fe0 100644
--- a/arch/powerpc/include/asm/fadump-internal.h
+++ b/arch/powerpc/include/asm/fadump-internal.h
@@ -135,4 +135,11 @@ static inline void
rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
#endif
+#ifdef CONFIG_PPC_POWERNV
+extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
+#else
+static inline void
+opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
+#endif
+
#endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 9d9f7c3..b17673d 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -107,11 +107,20 @@ 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)
{
- if (depth != 1 || strcmp(uname, "rtas") != 0)
+ if (depth != 1)
return 0;
- rtas_fadump_dt_scan(&fw_dump, node);
- return 1;
+ if (strcmp(uname, "rtas") == 0) {
+ rtas_fadump_dt_scan(&fw_dump, node);
+ return 1;
+ }
+
+ if (strcmp(uname, "ibm,opal") == 0) {
+ opal_fadump_dt_scan(&fw_dump, node);
+ return 1;
+ }
+
+ return 0;
}
/*
diff --git a/arch/powerpc/platforms/powernv/Makefile
b/arch/powerpc/platforms/powernv/Makefile
index da2e99e..43a6e1c 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -6,6 +6,7 @@ obj-y += opal-msglog.o opal-hmi.o
opal-power.o opal-irqchip.o
obj-y += opal-kmsg.o opal-powercap.o opal-psr.o
opal-sensor-groups.o
obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
+obj-$(CONFIG_FA_DUMP) += opal-fadump.o
obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o pci-ioda-tce.o
obj-$(CONFIG_CXL_BASE) += pci-cxl.o
obj-$(CONFIG_EEH) += eeh-powernv.o
diff --git a/arch/powerpc/platforms/powernv/opal-fadump.c
b/arch/powerpc/platforms/powernv/opal-fadump.c
new file mode 100644
index 0000000..bbc5356
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-fadump.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Firmware-Assisted Dump support on POWER platform (OPAL).
+ *
+ * Copyright 2019, Hari Bathini, IBM Corporation.
+ */
+
+#define pr_fmt(fmt) "opal fadump: " fmt
+
+#include <linux/string.h>
+#include <linux/seq_file.h>
+#include <linux/of_fdt.h>
+#include <linux/libfdt.h>
+
+#include <asm/opal.h>
+#include <asm/fadump-internal.h>
+
+static u64 opal_fadump_init_mem_struct(struct fw_dump *fadump_conf)
+{
+ return fadump_conf->reserve_dump_area_start;
+}
+
+static int opal_fadump_register(struct fw_dump *fadump_conf)
+{
+ return -EIO;
+}
+
+static int opal_fadump_unregister(struct fw_dump *fadump_conf)
+{
+ return -EIO;
+}
+
+static int opal_fadump_invalidate(struct fw_dump *fadump_conf)
+{
+ return -EIO;
+}
+
+static int __init opal_fadump_process(struct fw_dump *fadump_conf)
+{
+ return -EINVAL;
+}
+
+static void opal_fadump_region_show(struct fw_dump *fadump_conf,
+ struct seq_file *m)
+{
+}
+
+static void opal_fadump_trigger(struct fadump_crash_info_header *fdh,
+ const char *msg)
+{
+ int rc;
+
+ rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, msg);
+ if (rc == OPAL_UNSUPPORTED) {
+ pr_emerg("Reboot type %d not supported.\n",
+ OPAL_REBOOT_MPIPL);
+ } else if (rc == OPAL_HARDWARE)
+ pr_emerg("No backend support for MPIPL!\n");
+}
+
+static struct fadump_ops opal_fadump_ops = {
+ .fadump_init_mem_struct = opal_fadump_init_mem_struct,
+ .fadump_register = opal_fadump_register,
+ .fadump_unregister = opal_fadump_unregister,
+ .fadump_invalidate = opal_fadump_invalidate,
+ .fadump_process = opal_fadump_process,
+ .fadump_region_show = opal_fadump_region_show,
+ .fadump_trigger = opal_fadump_trigger,
+};
+
+void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node)
+{
+ unsigned long dn;
+
+ /*
+ * Check if Firmware-Assisted Dump is supported. if yes, check
+ * if dump has been initiated on last reboot.
+ */
+ dn = of_get_flat_dt_subnode_by_name(node, "dump");
+ if (dn == -FDT_ERR_NOTFOUND) {
+ pr_debug("FADump support is missing!\n");
+ return;
+ }
+
+ if (!of_flat_dt_is_compatible(dn, "ibm,opal-dump")) {
+ pr_err("Support missing for this f/w version!\n");
+ return;
+ }
+
+ fadump_conf->ops = &opal_fadump_ops;
+ fadump_conf->fadump_supported = 1;
+}
