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s390/IPL: Allow boot from other ssid than 0 

We now take the subchannel set id also into account to find the boot device.
If we want to use a subchannel set other than the default set 0, we first
need to enable the mss facility.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Dominik Dingel 2013-06-17 14:29:42 +02:00 committed by Alexander Graf
parent 461bdb3414
commit c8cda8748e
4 changed files with 46 additions and 0 deletions
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20
pc-bios/s390-ccw/cio.h
View File

@ -93,6 +93,26 @@ struct subchannel_id {
__u32 sch_no : 16;
} __attribute__ ((packed, aligned(4)));
struct chsc_header {
__u16 length;
__u16 code;
} __attribute__((packed));
struct chsc_area_sda {
struct chsc_header request;
__u8 reserved1:4;
__u8 format:4;
__u8 reserved2;
__u16 operation_code;
__u32 reserved3;
__u32 reserved4;
__u32 operation_data_area[252];
struct chsc_header response;
__u32 reserved5:4;
__u32 format2:4;
__u32 reserved6:24;
} __attribute__((packed));
/*
* TPI info structure
*/

7
pc-bios/s390-ccw/main.c
View File

@ -35,6 +35,13 @@ static void virtio_setup(uint64_t dev_info)
check_devno = true;
dev_no = dev_info & 0xffff;
debug_print_int("device no. ", dev_no);
blk_schid.ssid = (dev_info >> 16) & 0x3;
if (blk_schid.ssid != 0) {
debug_print_int("ssid ", blk_schid.ssid);
if (enable_mss_facility() != 0) {
virtio_panic("Failed to enable mss facility\n");
}
}
}
for (i = 0; i < 0x10000; i++) {

1
pc-bios/s390-ccw/s390-ccw.h
View File

@ -61,6 +61,7 @@ unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
bool virtio_is_blk(struct subchannel_id schid);
void virtio_setup_block(struct subchannel_id schid);
int virtio_read(ulong sector, void *load_addr);
int enable_mss_facility(void);
/* bootmap.c */
int zipl_load(void);

18
pc-bios/s390-ccw/virtio.c
View File

@ -13,6 +13,8 @@
struct vring block;
static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
static long kvm_hypercall(unsigned long nr, unsigned long param1,
unsigned long param2)
{
@ -301,3 +303,19 @@ bool virtio_is_blk(struct subchannel_id schid)
return true;
}
int enable_mss_facility(void)
{
int ret;
struct chsc_area_sda *sda_area = (struct chsc_area_sda *) chsc_page;
memset(sda_area, 0, PAGE_SIZE);
sda_area->request.length = 0x0400;
sda_area->request.code = 0x0031;
sda_area->operation_code = 0x2;
ret = chsc(sda_area);
if ((ret == 0) && (sda_area->response.code == 0x0001)) {
return 0;
}
return -EIO;
}