diff options
| -rw-r--r-- | arch/powerpc/platforms/pseries/phyp_dump.c | 137 |
1 files changed, 131 insertions, 6 deletions
diff --git a/arch/powerpc/platforms/pseries/phyp_dump.c b/arch/powerpc/platforms/pseries/phyp_dump.c index f355f052a56..d93f1b1585a 100644 --- a/arch/powerpc/platforms/pseries/phyp_dump.c +++ b/arch/powerpc/platforms/pseries/phyp_dump.c @@ -29,6 +29,117 @@ static struct phyp_dump phyp_dump_vars; struct phyp_dump *phyp_dump_info = &phyp_dump_vars; +static int ibm_configure_kernel_dump; +/* ------------------------------------------------- */ +/* RTAS interfaces to declare the dump regions */ + +struct dump_section { + u32 dump_flags; + u16 source_type; + u16 error_flags; + u64 source_address; + u64 source_length; + u64 length_copied; + u64 destination_address; +}; + +struct phyp_dump_header { + u32 version; + u16 num_of_sections; + u16 status; + + u32 first_offset_section; + u32 dump_disk_section; + u64 block_num_dd; + u64 num_of_blocks_dd; + u32 offset_dd; + u32 maxtime_to_auto; + /* No dump disk path string used */ + + struct dump_section cpu_data; + struct dump_section hpte_data; + struct dump_section kernel_data; +}; + +/* The dump header *must be* in low memory, so .bss it */ +static struct phyp_dump_header phdr; + +#define NUM_DUMP_SECTIONS 3 +#define DUMP_HEADER_VERSION 0x1 +#define DUMP_REQUEST_FLAG 0x1 +#define DUMP_SOURCE_CPU 0x0001 +#define DUMP_SOURCE_HPTE 0x0002 +#define DUMP_SOURCE_RMO 0x0011 + +/** + * init_dump_header() - initialize the header declaring a dump + * Returns: length of dump save area. + * + * When the hypervisor saves crashed state, it needs to put + * it somewhere. The dump header tells the hypervisor where + * the data can be saved. + */ +static unsigned long init_dump_header(struct phyp_dump_header *ph) +{ + unsigned long addr_offset = 0; + + /* Set up the dump header */ + ph->version = DUMP_HEADER_VERSION; + ph->num_of_sections = NUM_DUMP_SECTIONS; + ph->status = 0; + + ph->first_offset_section = + (u32)offsetof(struct phyp_dump_header, cpu_data); + ph->dump_disk_section = 0; + ph->block_num_dd = 0; + ph->num_of_blocks_dd = 0; + ph->offset_dd = 0; + + ph->maxtime_to_auto = 0; /* disabled */ + + /* The first two sections are mandatory */ + ph->cpu_data.dump_flags = DUMP_REQUEST_FLAG; + ph->cpu_data.source_type = DUMP_SOURCE_CPU; + ph->cpu_data.source_address = 0; + ph->cpu_data.source_length = phyp_dump_info->cpu_state_size; + ph->cpu_data.destination_address = addr_offset; + addr_offset += phyp_dump_info->cpu_state_size; + + ph->hpte_data.dump_flags = DUMP_REQUEST_FLAG; + ph->hpte_data.source_type = DUMP_SOURCE_HPTE; + ph->hpte_data.source_address = 0; + ph->hpte_data.source_length = phyp_dump_info->hpte_region_size; + ph->hpte_data.destination_address = addr_offset; + addr_offset += phyp_dump_info->hpte_region_size; + + /* This section describes the low kernel region */ + ph->kernel_data.dump_flags = DUMP_REQUEST_FLAG; + ph->kernel_data.source_type = DUMP_SOURCE_RMO; + ph->kernel_data.source_address = PHYP_DUMP_RMR_START; + ph->kernel_data.source_length = PHYP_DUMP_RMR_END; + ph->kernel_data.destination_address = addr_offset; + addr_offset += ph->kernel_data.source_length; + + return addr_offset; +} + +static void register_dump_area(struct phyp_dump_header *ph, unsigned long addr) +{ + int rc; + ph->cpu_data.destination_address += addr; + ph->hpte_data.destination_address += addr; + ph->kernel_data.destination_address += addr; + + do { + rc = rtas_call(ibm_configure_kernel_dump, 3, 1, NULL, + 1, ph, sizeof(struct phyp_dump_header)); + } while (rtas_busy_delay(rc)); + + if (rc) + printk(KERN_ERR "phyp-dump: unexpected error (%d) on " + "register\n", rc); +} + /* ------------------------------------------------- */ /** * release_memory_range -- release memory previously lmb_reserved @@ -107,7 +218,9 @@ static struct kobj_attribute rr = __ATTR(release_region, 0600, static int __init phyp_dump_setup(void) { struct device_node *rtas; - const int *dump_header = NULL; + const struct phyp_dump_header *dump_header = NULL; + unsigned long dump_area_start; + unsigned long dump_area_length; int header_len = 0; int rc; @@ -119,7 +232,13 @@ static int __init phyp_dump_setup(void) if (!phyp_dump_info->phyp_dump_configured) return -ENOSYS; - /* Is there dump data waiting for us? */ + /* Is there dump data waiting for us? If there isn't, + * then register a new dump area, and release all of + * the rest of the reserved ram. + * + * The /rtas/ibm,kernel-dump rtas node is present only + * if there is dump data waiting for us. + */ rtas = of_find_node_by_path("/rtas"); if (rtas) { dump_header = of_get_property(rtas, "ibm,kernel-dump", @@ -127,17 +246,23 @@ static int __init phyp_dump_setup(void) of_node_put(rtas); } - if (dump_header == NULL) + dump_area_length = init_dump_header(&phdr); + + /* align down */ + dump_area_start = phyp_dump_info->init_reserve_start & PAGE_MASK; + + if (dump_header == NULL) { + register_dump_area(&phdr, dump_area_start); return 0; + } /* Should we create a dump_subsys, analogous to s390/ipl.c ? */ rc = sysfs_create_file(kernel_kobj, &rr.attr); - if (rc) { + if (rc) printk(KERN_ERR "phyp-dump: unable to create sysfs file (%d)\n", rc); - return 0; - } + /* ToDo: re-register the dump area, for next time. */ return 0; } machine_subsys_initcall(pseries, phyp_dump_setup); |