diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/opal-fadump.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-fadump.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-fadump.c b/arch/powerpc/platforms/powernv/opal-fadump.c index ad4c18bd8809..c66fa96915ae 100644 --- a/arch/powerpc/platforms/powernv/opal-fadump.c +++ b/arch/powerpc/platforms/powernv/opal-fadump.c @@ -20,6 +20,67 @@ #include "opal-fadump.h" + +#ifdef CONFIG_PRESERVE_FA_DUMP +/* + * When dump is active but PRESERVE_FA_DUMP is enabled on the kernel, + * ensure crash data is preserved in hope that the subsequent memory + * preserving kernel boot is going to process this crash data. + */ +void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) +{ + const struct opal_fadump_mem_struct *opal_fdm_active; + const __be32 *prop; + unsigned long dn; + u64 addr = 0; + s64 ret; + + dn = of_get_flat_dt_subnode_by_name(node, "dump"); + if (dn == -FDT_ERR_NOTFOUND) + return; + + /* + * Check if dump has been initiated on last reboot. + */ + prop = of_get_flat_dt_prop(dn, "mpipl-boot", NULL); + if (!prop) + return; + + ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_KERNEL, &addr); + if ((ret != OPAL_SUCCESS) || !addr) { + pr_debug("Could not get Kernel metadata (%lld)\n", ret); + return; + } + + /* + * Preserve memory only if kernel memory regions are registered + * with f/w for MPIPL. + */ + addr = be64_to_cpu(addr); + pr_debug("Kernel metadata addr: %llx\n", addr); + opal_fdm_active = (void *)addr; + if (opal_fdm_active->registered_regions == 0) + return; + + ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_BOOT_MEM, &addr); + if ((ret != OPAL_SUCCESS) || !addr) { + pr_err("Failed to get boot memory tag (%lld)\n", ret); + return; + } + + /* + * Memory below this address can be used for booting a + * capture kernel or petitboot kernel. Preserve everything + * above this address for processing crashdump. + */ + fadump_conf->boot_mem_top = be64_to_cpu(addr); + pr_debug("Preserve everything above %llx\n", fadump_conf->boot_mem_top); + + pr_info("Firmware-assisted dump is active.\n"); + fadump_conf->dump_active = 1; +} + +#else /* CONFIG_PRESERVE_FA_DUMP */ static const struct opal_fadump_mem_struct *opal_fdm_active; static const struct opal_mpipl_fadump *opal_cpu_metadata; static struct opal_fadump_mem_struct *opal_fdm; @@ -183,6 +244,17 @@ static int opal_fadump_setup_metadata(struct fw_dump *fadump_conf) err = -EPERM; } + /* + * Register boot memory top address with f/w. Should be retrieved + * by a kernel that intends to preserve crash'ed kernel's memory. + */ + ret = opal_mpipl_register_tag(OPAL_MPIPL_TAG_BOOT_MEM, + fadump_conf->boot_memory_size); + if (ret != OPAL_SUCCESS) { + pr_err("Failed to set boot memory tag!\n"); + err = -EPERM; + } + return err; } @@ -649,3 +721,4 @@ void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) fadump_conf->dump_active = 1; opal_fadump_get_config(fadump_conf, opal_fdm_active); } +#endif /* !CONFIG_PRESERVE_FA_DUMP */ |