diff options
author | Feng Tang <feng.tang@intel.com> | 2010-05-26 11:28:08 +0800 |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2010-05-27 12:46:20 -0400 |
commit | dce80a56268fffd6b5ea57b3f6ba3d027a68f05e (patch) | |
tree | 387349e5e6ee31dbe26c57ac0bf5d223af4ef838 /drivers/sfi/sfi_core.c | |
parent | 5487ab4a5a71e955fef7094a0624df0542da91ef (diff) | |
download | linux-dce80a56268fffd6b5ea57b3f6ba3d027a68f05e.tar.bz2 |
SFI: add sysfs interface for SFI tables.
Analogous to ACPI's /sys/firmware/acpi/tables/...
create /sys/firmware/sfi/tables/
The tables are primariy for the kernel,
but sometimes it is useful for user-space to be
able to read them.
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/sfi/sfi_core.c')
-rw-r--r-- | drivers/sfi/sfi_core.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/sfi/sfi_core.c b/drivers/sfi/sfi_core.c index aba6a461365b..005195958647 100644 --- a/drivers/sfi/sfi_core.c +++ b/drivers/sfi/sfi_core.c @@ -67,6 +67,7 @@ #include <linux/acpi.h> #include <linux/init.h> #include <linux/sfi.h> +#include <linux/slab.h> #include "sfi_core.h" @@ -382,6 +383,102 @@ static __init int sfi_find_syst(void) return -1; } +static struct kobject *sfi_kobj; +static struct kobject *tables_kobj; + +static ssize_t sfi_table_show(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t offset, size_t count) +{ + struct sfi_table_attr *tbl_attr = + container_of(bin_attr, struct sfi_table_attr, attr); + struct sfi_table_header *th = NULL; + struct sfi_table_key key; + ssize_t cnt; + + key.sig = tbl_attr->name; + key.oem_id = NULL; + key.oem_table_id = NULL; + + if (strncmp(SFI_SIG_SYST, tbl_attr->name, SFI_SIGNATURE_SIZE)) { + th = sfi_get_table(&key); + if (!th) + return 0; + + cnt = memory_read_from_buffer(buf, count, &offset, + th, th->len); + sfi_put_table(th); + } else + cnt = memory_read_from_buffer(buf, count, &offset, + syst_va, syst_va->header.len); + + return cnt; +} + +struct sfi_table_attr __init *sfi_sysfs_install_table(u64 pa) +{ + struct sfi_table_attr *tbl_attr; + struct sfi_table_header *th; + int ret; + + tbl_attr = kzalloc(sizeof(struct sfi_table_attr), GFP_KERNEL); + if (!tbl_attr) + return NULL; + + th = sfi_map_table(pa); + if (!th || !th->sig[0]) { + kfree(tbl_attr); + return NULL; + } + + sysfs_attr_init(&tbl_attr->attr.attr); + memcpy(tbl_attr->name, th->sig, SFI_SIGNATURE_SIZE); + + tbl_attr->attr.size = 0; + tbl_attr->attr.read = sfi_table_show; + tbl_attr->attr.attr.name = tbl_attr->name; + tbl_attr->attr.attr.mode = 0400; + + ret = sysfs_create_bin_file(tables_kobj, + &tbl_attr->attr); + if (ret) + kfree(tbl_attr); + + sfi_unmap_table(th); + return tbl_attr; +} + +static int __init sfi_sysfs_init(void) +{ + int tbl_cnt, i; + + if (sfi_disabled) + return 0; + + sfi_kobj = kobject_create_and_add("sfi", firmware_kobj); + if (!sfi_kobj) + return 0; + + tables_kobj = kobject_create_and_add("tables", sfi_kobj); + if (!tables_kobj) { + kobject_put(sfi_kobj); + return 0; + } + + sfi_sysfs_install_table(syst_pa); + + tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); + + for (i = 0; i < tbl_cnt; i++) + sfi_sysfs_install_table(syst_va->pentry[i]); + + sfi_acpi_sysfs_init(); + kobject_uevent(sfi_kobj, KOBJ_ADD); + kobject_uevent(tables_kobj, KOBJ_ADD); + pr_info("SFI sysfs interfaces init success\n"); + return 0; +} + void __init sfi_init(void) { if (!acpi_disabled) @@ -414,3 +511,9 @@ void __init sfi_init_late(void) sfi_acpi_init(); } + +/* + * The reason we put it here becasue we need wait till the /sys/firmware + * is setup, then our interface can be registered in /sys/firmware/sfi + */ +core_initcall(sfi_sysfs_init); |