diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/opal-fadump.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-fadump.c | 84 |
1 files changed, 83 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-fadump.c b/arch/powerpc/platforms/powernv/opal-fadump.c index bbc5356bdc77..21de832f2ba4 100644 --- a/arch/powerpc/platforms/powernv/opal-fadump.c +++ b/arch/powerpc/platforms/powernv/opal-fadump.c @@ -11,13 +11,83 @@ #include <linux/seq_file.h> #include <linux/of_fdt.h> #include <linux/libfdt.h> +#include <linux/mm.h> +#include <asm/page.h> #include <asm/opal.h> #include <asm/fadump-internal.h> +#include "opal-fadump.h" + +static struct opal_fadump_mem_struct *opal_fdm; + +/* Initialize kernel metadata */ +static void opal_fadump_init_metadata(struct opal_fadump_mem_struct *fdm) +{ + fdm->version = OPAL_FADUMP_VERSION; + fdm->region_cnt = 0; + fdm->registered_regions = 0; + fdm->fadumphdr_addr = 0; +} + static u64 opal_fadump_init_mem_struct(struct fw_dump *fadump_conf) { - return fadump_conf->reserve_dump_area_start; + u64 addr = fadump_conf->reserve_dump_area_start; + + opal_fdm = __va(fadump_conf->kernel_metadata); + opal_fadump_init_metadata(opal_fdm); + + opal_fdm->region_cnt = 1; + opal_fdm->rgn[0].src = 0; + opal_fdm->rgn[0].dest = addr; + opal_fdm->rgn[0].size = fadump_conf->boot_memory_size; + addr += fadump_conf->boot_memory_size; + + /* + * Kernel metadata is passed to f/w and retrieved in capture kerenl. + * So, use it to save fadump header address instead of calculating it. + */ + opal_fdm->fadumphdr_addr = (opal_fdm->rgn[0].dest + + fadump_conf->boot_memory_size); + + return addr; +} + +static u64 opal_fadump_get_metadata_size(void) +{ + return PAGE_ALIGN(sizeof(struct opal_fadump_mem_struct)); +} + +static int opal_fadump_setup_metadata(struct fw_dump *fadump_conf) +{ + int err = 0; + s64 ret; + + /* + * Use the last page(s) in FADump memory reservation for + * kernel metadata. + */ + fadump_conf->kernel_metadata = (fadump_conf->reserve_dump_area_start + + fadump_conf->reserve_dump_area_size - + opal_fadump_get_metadata_size()); + pr_info("Kernel metadata addr: %llx\n", fadump_conf->kernel_metadata); + + /* Initialize kernel metadata before registering the address with f/w */ + opal_fdm = __va(fadump_conf->kernel_metadata); + opal_fadump_init_metadata(opal_fdm); + + /* + * Register metadata address with f/w. Can be retrieved in + * the capture kernel. + */ + ret = opal_mpipl_register_tag(OPAL_MPIPL_TAG_KERNEL, + fadump_conf->kernel_metadata); + if (ret != OPAL_SUCCESS) { + pr_err("Failed to set kernel metadata tag!\n"); + err = -EPERM; + } + + return err; } static int opal_fadump_register(struct fw_dump *fadump_conf) @@ -43,6 +113,16 @@ static int __init opal_fadump_process(struct fw_dump *fadump_conf) static void opal_fadump_region_show(struct fw_dump *fadump_conf, struct seq_file *m) { + const struct opal_fadump_mem_struct *fdm_ptr = opal_fdm; + u64 dumped_bytes = 0; + int i; + + for (i = 0; i < fdm_ptr->region_cnt; i++) { + 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); + } } static void opal_fadump_trigger(struct fadump_crash_info_header *fdh, @@ -60,6 +140,8 @@ static void opal_fadump_trigger(struct fadump_crash_info_header *fdh, static struct fadump_ops opal_fadump_ops = { .fadump_init_mem_struct = opal_fadump_init_mem_struct, + .fadump_get_metadata_size = opal_fadump_get_metadata_size, + .fadump_setup_metadata = opal_fadump_setup_metadata, .fadump_register = opal_fadump_register, .fadump_unregister = opal_fadump_unregister, .fadump_invalidate = opal_fadump_invalidate, |