#include "s390-ccw.h"
#include "virtio.h"
-struct vring block;
+static 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)
{
- register ulong r_nr asm("1") = nr;
- register ulong r_param1 asm("2") = param1;
- register ulong r_param2 asm("3") = param2;
- register long retval asm("2");
+ register ulong r_nr asm("1") = nr;
+ register ulong r_param1 asm("2") = param1;
+ register ulong r_param2 asm("3") = param2;
+ register long retval asm("2");
- asm volatile ("diag 2,4,0x500"
- : "=d" (retval)
- : "d" (r_nr), "0" (r_param1), "r"(r_param2)
- : "memory", "cc");
+ asm volatile ("diag 2,4,0x500"
+ : "=d" (retval)
+ : "d" (r_nr), "0" (r_param1), "r"(r_param2)
+ : "memory", "cc");
- return retval;
+ return retval;
}
static void virtio_notify(struct subchannel_id schid)
{
- kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32*)&schid, 0);
+ kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid, 0);
}
/***********************************************
vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + align-1)
& ~(align - 1));
+ /* Zero out all relevant field */
+ vr->avail->flags = 0;
+ vr->avail->idx = 0;
+
/* We're running with interrupts off anyways, so don't bother */
vr->used->flags = VRING_USED_F_NO_NOTIFY;
+ vr->used->idx = 0;
+ vr->used_idx = 0;
+ vr->next_idx = 0;
debug_print_addr("init vr", vr);
}
if (!(flags & VRING_DESC_F_NEXT)) {
vr->avail->idx++;
}
-
- vr->used->idx = vr->next_idx;
}
static u64 get_clock(void)
struct subchannel_id schid = vr->schid;
int r = 0;
- while (vr->used->idx == vr->next_idx) {
+ /* Wait until the used index has moved. */
+ while (vr->used->idx == vr->used_idx) {
vring_notify(schid);
if (timeout && (get_second() >= target_second)) {
r = 1;
yield();
}
+ vr->used_idx = vr->used->idx;
vr->next_idx = 0;
vr->desc[0].len = 0;
vr->desc[0].flags = 0;
* Virtio block *
***********************************************/
-static int virtio_read_many(ulong sector, void *load_addr, int sec_num)
+int virtio_read_many(ulong sector, void *load_addr, int sec_num)
{
struct virtio_blk_outhdr out_hdr;
u8 status;
/* Tell the host we want to read */
out_hdr.type = VIRTIO_BLK_T_IN;
out_hdr.ioprio = 99;
- out_hdr.sector = sector;
+ out_hdr.sector = virtio_sector_adjust(sector);
vring_send_buf(&block, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
/* This is where we want to receive data */
- vring_send_buf(&block, load_addr, SECTOR_SIZE * sec_num,
+ vring_send_buf(&block, load_addr, virtio_get_block_size() * sec_num,
VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN |
VRING_DESC_F_NEXT);
}
unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
- ulong subchan_id, void *load_addr)
+ ulong subchan_id, void *load_addr)
{
u8 status;
int sec = rec_list1;
- int sec_num = (((rec_list2 >> 32)+ 1) & 0xffff);
+ int sec_num = ((rec_list2 >> 32) & 0xffff) + 1;
int sec_len = rec_list2 >> 48;
ulong addr = (ulong)load_addr;
- if (sec_len != SECTOR_SIZE) {
+ if (sec_len != virtio_get_block_size()) {
return -1;
}
sclp_print(".");
- status = virtio_read_many(sec, (void*)addr, sec_num);
+ status = virtio_read_many(sec, (void *)addr, sec_num);
if (status) {
virtio_panic("I/O Error");
}
- addr += sec_num * SECTOR_SIZE;
+ addr += sec_num * virtio_get_block_size();
return 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;
+}
+
+void virtio_assume_scsi(void)
+{
+ guessed_disk_nature = true;
+ blk_cfg.blk_size = 512;
+ blk_cfg.physical_block_exp = 0;
+}
+
+void virtio_assume_eckd(void)
+{
+ guessed_disk_nature = true;
+ blk_cfg.blk_size = 4096;
+ blk_cfg.physical_block_exp = 0;
+
+ /* this must be here to calculate code segment position */
+ blk_cfg.geometry.heads = 15;
+ blk_cfg.geometry.sectors = 12;
+}
+
+bool virtio_disk_is_scsi(void)
+{
+ if (guessed_disk_nature) {
+ return (virtio_get_block_size() == 512);
+ }
+ return (blk_cfg.geometry.heads == 255)
+ && (blk_cfg.geometry.sectors == 63)
+ && (virtio_get_block_size() == 512);
+}
+
+/*
+ * Other supported value pairs, if any, would need to be added here.
+ * Note: head count is always 15.
+ */
+static inline u8 virtio_eckd_sectors_for_block_size(int size)
+{
+ switch (size) {
+ case 512:
+ return 49;
+ case 1024:
+ return 33;
+ case 2048:
+ return 21;
+ case 4096:
+ return 12;
+ }
+ return 0;
+}
+
+bool virtio_disk_is_eckd(void)
+{
+ const int block_size = virtio_get_block_size();
+
+ if (guessed_disk_nature) {
+ return (block_size == 4096);
+ }
+ return (blk_cfg.geometry.heads == 15)
+ && (blk_cfg.geometry.sectors ==
+ virtio_eckd_sectors_for_block_size(block_size));
+}
+
+bool virtio_ipl_disk_is_valid(void)
+{
+ return virtio_disk_is_scsi() || virtio_disk_is_eckd();
+}
+
+int virtio_get_block_size(void)
+{
+ return blk_cfg.blk_size << blk_cfg.physical_block_exp;
+}
+
+uint8_t virtio_get_heads(void)
+{
+ return blk_cfg.geometry.heads;
+}
+
+uint8_t virtio_get_sectors(void)
+{
+ return blk_cfg.geometry.sectors;
+}
+
+uint64_t virtio_get_blocks(void)
+{
+ return blk_cfg.capacity /
+ (virtio_get_block_size() / VIRTIO_SECTOR_SIZE);
+}
+
void virtio_setup_block(struct subchannel_id schid)
{
struct vq_info_block info;
struct vq_config_block config = {};
+ blk_cfg.blk_size = 0; /* mark "illegal" - setup started... */
+ guessed_disk_nature = false;
+
virtio_reset(schid);
+ /*
+ * Skipping CCW_CMD_READ_FEAT. We're not doing anything fancy, and
+ * we'll just stop dead anyway if anything does not work like we
+ * expect it.
+ */
+
config.index = 0;
if (run_ccw(schid, CCW_CMD_READ_VQ_CONF, &config, sizeof(config))) {
+ virtio_panic("Could not get block device VQ configuration\n");
+ }
+ if (run_ccw(schid, CCW_CMD_READ_CONF, &blk_cfg, sizeof(blk_cfg))) {
virtio_panic("Could not get block device configuration\n");
}
- vring_init(&block, config.num, (void*)(100 * 1024 * 1024),
+ vring_init(&block, config.num, ring_area,
KVM_S390_VIRTIO_RING_ALIGN);
- info.queue = (100ULL * 1024ULL* 1024ULL);
+ info.queue = (unsigned long long) ring_area;
info.align = KVM_S390_VIRTIO_RING_ALIGN;
info.index = 0;
info.num = config.num;
if (!run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info))) {
virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK);
}
+
+ 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));
+ virtio_assume_scsi();
+ }
}
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;
+}
projects / qemu.git / blobdiff