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pc-bios/s390-ccw: add vdev object to store all device details

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Add VDev "object" as a container for all device-related items.
The default object is static.

Leverage dependency on many different device-related globals.
Make them syntactically visible.

Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Eugene (jno) Dvurechenski 2015-10-26 15:47:24 +01:00 committed by Cornelia Huck
parent 8512989143
commit 69429682c6
2 changed files with 116 additions and 83 deletions
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181
pc-bios/s390-ccw/virtio.c
View File

@ -11,13 +11,34 @@
#include "s390-ccw.h"
#include "virtio.h"
#define VRING_WAIT_REPLY_TIMEOUT 3
static VRing block[VIRTIO_MAX_VQS];
static char ring_area[VIRTIO_RING_SIZE * VIRTIO_MAX_VQS]
__attribute__((__aligned__(PAGE_SIZE)));
static int nr_vqs = 1;
static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
static VDev vdev = {
.nr_vqs = 1,
.vrings = block,
.cmd_vr_idx = 0,
.ring_area = ring_area,
.wait_reply_timeout = VRING_WAIT_REPLY_TIMEOUT,
.guessed_disk_nature = false,
.schid = { .one = 1 },
};
VDev *virtio_get_device(void)
{
return &vdev;
}
VirtioDevType virtio_get_device_type(void)
{
return vdev.senseid.cu_model;
}
/* virtio spec v1.0 para 4.3.3.2 */
static long kvm_hypercall(unsigned long nr, unsigned long param1,
unsigned long param2, unsigned long param3)
@ -65,7 +86,7 @@ static int drain_irqs(SubChannelId schid)
}
}
static int run_ccw(SubChannelId schid, int cmd, void *ptr, int len)
static int run_ccw(VDev *vdev, int cmd, void *ptr, int len)
{
Ccw1 ccw = {};
CmdOrb orb = {};
@ -73,9 +94,9 @@ static int run_ccw(SubChannelId schid, int cmd, void *ptr, int len)
int r;
/* start command processing */
stsch_err(schid, &schib);
stsch_err(vdev->schid, &schib);
schib.scsw.ctrl = SCSW_FCTL_START_FUNC;
msch(schid, &schib);
msch(vdev->schid, &schib);
/* start subchannel command */
orb.fmt = 1;
@ -86,32 +107,18 @@ static int run_ccw(SubChannelId schid, int cmd, void *ptr, int len)
ccw.cda = (long)ptr;
ccw.count = len;
r = ssch(schid, &orb);
r = ssch(vdev->schid, &orb);
/*
* XXX Wait until device is done processing the CCW. For now we can
* assume that a simple tsch will have finished the CCW processing,
* but the architecture allows for asynchronous operation
*/
if (!r) {
r = drain_irqs(schid);
r = drain_irqs(vdev->schid);
}
return r;
}
static void virtio_set_status(SubChannelId schid,
unsigned long dev_addr)
{
unsigned char status = dev_addr;
if (run_ccw(schid, CCW_CMD_WRITE_STATUS, &status, sizeof(status))) {
panic("Could not write status to host!\n");
}
}
static void virtio_reset(SubChannelId schid)
{
run_ccw(schid, CCW_CMD_VDEV_RESET, NULL, 0);
}
static void vring_init(VRing *vr, VqInfo *info)
{
void *p = (void *) info->queue;
@ -199,22 +206,22 @@ static int vr_poll(VRing *vr)
*
* Returns 0 on success, 1 on timeout.
*/
static int vring_wait_reply(int timeout)
static int vring_wait_reply(void)
{
ulong target_second = get_second() + timeout;
ulong target_second = get_second() + vdev.wait_reply_timeout;
/* Wait for any queue to be updated by the host */
do {
int i, r = 0;
for (i = 0; i < nr_vqs; i++) {
r += vr_poll(&block[i]);
for (i = 0; i < vdev.nr_vqs; i++) {
r += vr_poll(&vdev.vrings[i]);
}
yield();
if (r) {
return 0;
}
} while (!timeout || (get_second() < target_second));
} while (!vdev.wait_reply_timeout || (get_second() < target_second));
return 1;
}
@ -227,29 +234,28 @@ int virtio_read_many(ulong sector, void *load_addr, int sec_num)
{
VirtioBlkOuthdr out_hdr;
u8 status;
int r;
VRing *vr = &vdev.vrings[vdev.cmd_vr_idx];
/* Tell the host we want to read */
out_hdr.type = VIRTIO_BLK_T_IN;
out_hdr.ioprio = 99;
out_hdr.sector = virtio_sector_adjust(sector);
vring_send_buf(&block[0], &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
vring_send_buf(vr, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
/* This is where we want to receive data */
vring_send_buf(&block[0], load_addr, virtio_get_block_size() * sec_num,
vring_send_buf(vr, load_addr, virtio_get_block_size() * sec_num,
VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN |
VRING_DESC_F_NEXT);
/* status field */
vring_send_buf(&block[0], &status, sizeof(u8), VRING_DESC_F_WRITE |
VRING_HIDDEN_IS_CHAIN);
vring_send_buf(vr, &status, sizeof(u8),
VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN);
/* Now we can tell the host to read */
vring_wait_reply(0);
vring_wait_reply();
r = drain_irqs(block[0].schid);
if (r) {
if (drain_irqs(vr->schid)) {
/* Well, whatever status is supposed to contain... */
status = 1;
}
@ -284,46 +290,43 @@ int virtio_read(ulong sector, void *load_addr)
return virtio_read_many(sector, load_addr, 1);
}
static VirtioBlkConfig blk_cfg = {};
static bool guessed_disk_nature;
bool virtio_guessed_disk_nature(void)
{
return guessed_disk_nature;
return vdev.guessed_disk_nature;
}
void virtio_assume_scsi(void)
{
guessed_disk_nature = true;
blk_cfg.blk_size = 512;
blk_cfg.physical_block_exp = 0;
vdev.guessed_disk_nature = true;
vdev.config.blk.blk_size = 512;
vdev.config.blk.physical_block_exp = 0;
}
void virtio_assume_iso9660(void)
{
guessed_disk_nature = true;
blk_cfg.blk_size = 2048;
blk_cfg.physical_block_exp = 0;
vdev.guessed_disk_nature = true;
vdev.config.blk.blk_size = 2048;
vdev.config.blk.physical_block_exp = 0;
}
void virtio_assume_eckd(void)
{
guessed_disk_nature = true;
blk_cfg.blk_size = 4096;
blk_cfg.physical_block_exp = 0;
vdev.guessed_disk_nature = true;
vdev.config.blk.blk_size = 4096;
vdev.config.blk.physical_block_exp = 0;
/* this must be here to calculate code segment position */
blk_cfg.geometry.heads = 15;
blk_cfg.geometry.sectors = 12;
vdev.config.blk.geometry.heads = 15;
vdev.config.blk.geometry.sectors = 12;
}
bool virtio_disk_is_scsi(void)
{
if (guessed_disk_nature) {
if (vdev.guessed_disk_nature) {
return (virtio_get_block_size() == 512);
}
return (blk_cfg.geometry.heads == 255)
&& (blk_cfg.geometry.sectors == 63)
return (vdev.config.blk.geometry.heads == 255)
&& (vdev.config.blk.geometry.sectors == 63)
&& (virtio_get_block_size() == 512);
}
@ -350,11 +353,11 @@ bool virtio_disk_is_eckd(void)
{
const int block_size = virtio_get_block_size();
if (guessed_disk_nature) {
if (vdev.guessed_disk_nature) {
return (block_size == 4096);
}
return (blk_cfg.geometry.heads == 15)
&& (blk_cfg.geometry.sectors ==
return (vdev.config.blk.geometry.heads == 15)
&& (vdev.config.blk.geometry.sectors ==
virtio_eckd_sectors_for_block_size(block_size));
}
@ -365,36 +368,45 @@ bool virtio_ipl_disk_is_valid(void)
int virtio_get_block_size(void)
{
return blk_cfg.blk_size << blk_cfg.physical_block_exp;
return vdev.config.blk.blk_size << vdev.config.blk.physical_block_exp;
}
uint8_t virtio_get_heads(void)
{
return blk_cfg.geometry.heads;
return vdev.config.blk.geometry.heads;
}
uint8_t virtio_get_sectors(void)
{
return blk_cfg.geometry.sectors;
return vdev.config.blk.geometry.sectors;
}
uint64_t virtio_get_blocks(void)
{
return blk_cfg.capacity /
return vdev.config.blk.capacity /
(virtio_get_block_size() / VIRTIO_SECTOR_SIZE);
}
static void virtio_setup_ccw(SubChannelId schid,
int nvr, void *cfg, int cfg_size)
static void virtio_setup_ccw(VDev *vdev)
{
int i;
int i, cfg_size;
unsigned char status = VIRTIO_CONFIG_S_DRIVER_OK;
blk_cfg.blk_size = 0; /* mark "illegal" - setup started... */
nr_vqs = nvr;
guessed_disk_nature = false;
vdev->config.blk.blk_size = 0; /* mark "illegal" - setup started... */
vdev->guessed_disk_nature = false;
virtio_reset(schid);
IPL_assert(run_ccw(schid, CCW_CMD_READ_CONF, cfg, cfg_size) == 0,
run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0);
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
vdev->nr_vqs = 1;
vdev->cmd_vr_idx = 0;
cfg_size = sizeof(vdev->config.blk);
break;
default:
panic("Unsupported virtio device\n");
}
IPL_assert(run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size) == 0,
"Could not get block device configuration");
/*
@ -403,7 +415,7 @@ static void virtio_setup_ccw(SubChannelId schid,
* expect it.
*/
for (i = 0; i < nr_vqs; i++) {
for (i = 0; i < vdev->nr_vqs; i++) {
VqInfo info = {
.queue = (unsigned long long) ring_area + (i * VIRTIO_RING_SIZE),
.align = KVM_S390_VIRTIO_RING_ALIGN,
@ -416,43 +428,46 @@ static void virtio_setup_ccw(SubChannelId schid,
};
IPL_assert(
run_ccw(schid, CCW_CMD_READ_VQ_CONF, &config, sizeof(config)) == 0,
run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config)) == 0,
"Could not get block device VQ configuration");
info.num = config.num;
vring_init(&block[i], &info);
block[i].schid = schid;
IPL_assert(run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info)) == 0,
vring_init(&vdev->vrings[i], &info);
vdev->vrings[i].schid = vdev->schid;
IPL_assert(run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info)) == 0,
"Cannot set VQ info");
}
virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK);
IPL_assert(
run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status)) == 0,
"Could not write status to host");
}
void virtio_setup_block(SubChannelId schid)
{
virtio_setup_ccw(schid, 1, &blk_cfg, sizeof(blk_cfg));
vdev.schid = schid;
virtio_setup_ccw(&vdev);
if (!virtio_ipl_disk_is_valid()) {
/* make sure all getters but blocksize return 0 for invalid IPL disk */
memset(&blk_cfg, 0, sizeof(blk_cfg));
memset(&vdev.config.blk, 0, sizeof(vdev.config.blk));
virtio_assume_scsi();
}
}
bool virtio_is_blk(SubChannelId schid)
{
int r;
SenseId senseid = {};
vdev.schid = schid;
memset(&vdev.senseid, 0, sizeof(vdev.senseid));
/* run sense id command */
r = run_ccw(schid, CCW_CMD_SENSE_ID, &senseid, sizeof(senseid));
if (r) {
if (run_ccw(&vdev, CCW_CMD_SENSE_ID, &vdev.senseid, sizeof(vdev.senseid))) {
return false;
}
if ((senseid.cu_type != 0x3832) || (senseid.cu_model != VIRTIO_ID_BLOCK)) {
return false;
}
if (vdev.senseid.cu_type == 0x3832) {
switch (vdev.senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return true;
}
}
return false;
}
int enable_mss_facility(void)

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

@ -222,4 +222,22 @@ static inline ulong virtio_sector_adjust(ulong sector)
return sector * (virtio_get_block_size() / VIRTIO_SECTOR_SIZE);
}
struct VDev {
int nr_vqs;
VRing *vrings;
int cmd_vr_idx;
void *ring_area;
long wait_reply_timeout;
bool guessed_disk_nature;
SubChannelId schid;
SenseId senseid;
union {
VirtioBlkConfig blk;
} config;
};
typedef struct VDev VDev;
VDev *virtio_get_device(void);
VirtioDevType virtio_get_device_type(void);
#endif /* VIRTIO_H */