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imsm: use efivarfs interface for reading UEFI variables 

Read UEFI variables using the new efivarfs interface, fallback to
sysfs-efivars if that fails.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Artur Paszkiewicz 2014-11-20 18:56:13 +01:00 committed by NeilBrown
parent 0858eccf86
commit 88605db99c
1 changed files with 36 additions and 1 deletions
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37
platform-intel.c
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@ -416,6 +416,7 @@ static const struct imsm_orom *find_imsm_hba_orom(struct sys_dev *hba)
(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
#define SYS_EFI_VAR_PATH "/sys/firmware/efi/vars"
#define SYS_EFIVARS_PATH "/sys/firmware/efi/efivars"
#define SCU_PROP "RstScuV"
#define AHCI_PROP "RstSataV"
#define AHCI_SSATA_PROP "RstsSatV"
@ -426,13 +427,47 @@ static const struct imsm_orom *find_imsm_hba_orom(struct sys_dev *hba)
#define PCI_CLASS_RAID_CNTRL 0x010400
int read_efi_variable(void *buffer, ssize_t buf_size, char *variable_name, struct efi_guid guid)
static int read_efi_var(void *buffer, ssize_t buf_size, char *variable_name, struct efi_guid guid)
{
char path[PATH_MAX];
char buf[GUID_STR_MAX];
int fd;
ssize_t n;
snprintf(path, PATH_MAX, "%s/%s-%s", SYS_EFIVARS_PATH, variable_name, guid_str(buf, guid));
fd = open(path, O_RDONLY);
if (fd < 0)
return 1;
/* read the variable attributes and ignore it */
n = read(fd, buf, sizeof(__u32));
if (n < 0) {
close(fd);
return 1;
}
/* read the variable data */
n = read(fd, buffer, buf_size);
close(fd);
if (n < buf_size)
return 1;
return 0;
}
static int read_efi_variable(void *buffer, ssize_t buf_size, char *variable_name, struct efi_guid guid)
{
char path[PATH_MAX];
char buf[GUID_STR_MAX];
int dfd;
ssize_t n, var_data_len;
/* Try to read the variable using the new efivarfs interface first.
* If that fails, fall back to the old sysfs-efivars interface. */
if (!read_efi_var(buffer, buf_size, variable_name, guid))
return 0;
snprintf(path, PATH_MAX, "%s/%s-%s/size", SYS_EFI_VAR_PATH, variable_name, guid_str(buf, guid));
dprintf("EFI VAR: path=%s\n", path);