diff options
Diffstat (limited to 'arch/s390/kernel/diag.c')
| -rw-r--r-- | arch/s390/kernel/diag.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c index 82079f2d8583..f9f06cd8fcee 100644 --- a/arch/s390/kernel/diag.c +++ b/arch/s390/kernel/diag.c @@ -11,6 +11,7 @@ #include <linux/cpu.h> #include <linux/seq_file.h> #include <linux/debugfs.h> +#include <linux/vmalloc.h> #include <asm/asm-extable.h> #include <asm/diag.h> #include <asm/trace/diag.h> @@ -50,6 +51,7 @@ static const struct diag_desc diag_map[NR_DIAG_STAT] = { [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, + [DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" }, [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, }; @@ -167,8 +169,29 @@ static inline int __diag204(unsigned long *subcode, unsigned long size, void *ad return rp.odd; } +/** + * diag204() - Issue diagnose 204 call. + * @subcode: Subcode of diagnose 204 to be executed. + * @size: Size of area in pages which @area points to, if given. + * @addr: Vmalloc'ed memory area where the result is written to. + * + * Execute diagnose 204 with the given subcode and write the result to the + * memory area specified with @addr. For subcodes which do not write a + * result to memory both @size and @addr must be zero. If @addr is + * specified it must be page aligned and must have been allocated with + * vmalloc(). Conversion to real / physical addresses will be handled by + * this function if required. + */ int diag204(unsigned long subcode, unsigned long size, void *addr) { + if (addr) { + if (WARN_ON_ONCE(!is_vmalloc_addr(addr))) + return -1; + if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE))) + return -1; + } + if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4) + addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr)); diag_stat_inc(DIAG_STAT_X204); size = __diag204(&subcode, size, addr); if (subcode) @@ -200,7 +223,7 @@ int diag210(struct diag210 *addr) EXPORT_SYMBOL(diag210); /* - * Diagnose 210: Get information about a virtual device + * Diagnose 8C: Access 3270 Display Device Information */ int diag8c(struct diag8c *addr, struct ccw_dev_id *devno) { |