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-rw-r--r--qemu/pc-bios/s390-ccw/virtio.c608
1 files changed, 0 insertions, 608 deletions
diff --git a/qemu/pc-bios/s390-ccw/virtio.c b/qemu/pc-bios/s390-ccw/virtio.c
deleted file mode 100644
index 1d34e8c1a..000000000
--- a/qemu/pc-bios/s390-ccw/virtio.c
+++ /dev/null
@@ -1,608 +0,0 @@
-/*
- * Virtio driver bits
- *
- * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or (at
- * your option) any later version. See the COPYING file in the top-level
- * directory.
- */
-
-#include "s390-ccw.h"
-#include "virtio.h"
-#include "virtio-scsi.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 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,
- .schid = { .one = 1 },
- .scsi_block_size = VIRTIO_SCSI_BLOCK_SIZE,
- .blk_factor = 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)
-{
- register ulong r_nr asm("1") = nr;
- register ulong r_param1 asm("2") = param1;
- register ulong r_param2 asm("3") = param2;
- register ulong r_param3 asm("4") = param3;
- register long retval asm("2");
-
- asm volatile ("diag 2,4,0x500"
- : "=d" (retval)
- : "d" (r_nr), "0" (r_param1), "r"(r_param2), "d"(r_param3)
- : "memory", "cc");
-
- return retval;
-}
-
-static long virtio_notify(SubChannelId schid, int vq_idx, long cookie)
-{
- return kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid,
- vq_idx, cookie);
-}
-
-/***********************************************
- * Virtio functions *
- ***********************************************/
-
-static int drain_irqs(SubChannelId schid)
-{
- Irb irb = {};
- int r = 0;
-
- while (1) {
- /* FIXME: make use of TPI, for that enable subchannel and isc */
- if (tsch(schid, &irb)) {
- /* Might want to differentiate error codes later on. */
- if (irb.scsw.cstat) {
- r = -EIO;
- } else if (irb.scsw.dstat != 0xc) {
- r = -EIO;
- }
- return r;
- }
- }
-}
-
-static int run_ccw(VDev *vdev, int cmd, void *ptr, int len)
-{
- Ccw1 ccw = {};
- CmdOrb orb = {};
- Schib schib;
- int r;
-
- /* start command processing */
- stsch_err(vdev->schid, &schib);
- schib.scsw.ctrl = SCSW_FCTL_START_FUNC;
- msch(vdev->schid, &schib);
-
- /* start subchannel command */
- orb.fmt = 1;
- orb.cpa = (u32)(long)&ccw;
- orb.lpm = 0x80;
-
- ccw.cmd_code = cmd;
- ccw.cda = (long)ptr;
- ccw.count = len;
-
- 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(vdev->schid);
- }
- return r;
-}
-
-static void vring_init(VRing *vr, VqInfo *info)
-{
- void *p = (void *) info->queue;
-
- debug_print_addr("init p", p);
- vr->id = info->index;
- vr->num = info->num;
- vr->desc = p;
- vr->avail = p + info->num * sizeof(VRingDesc);
- vr->used = (void *)(((unsigned long)&vr->avail->ring[info->num]
- + info->align - 1) & ~(info->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;
- vr->cookie = 0;
-
- debug_print_addr("init vr", vr);
-}
-
-static bool vring_notify(VRing *vr)
-{
- vr->cookie = virtio_notify(vr->schid, vr->id, vr->cookie);
- return vr->cookie >= 0;
-}
-
-static void vring_send_buf(VRing *vr, void *p, int len, int flags)
-{
- /* For follow-up chains we need to keep the first entry point */
- if (!(flags & VRING_HIDDEN_IS_CHAIN)) {
- vr->avail->ring[vr->avail->idx % vr->num] = vr->next_idx;
- }
-
- vr->desc[vr->next_idx].addr = (ulong)p;
- vr->desc[vr->next_idx].len = len;
- vr->desc[vr->next_idx].flags = flags & ~VRING_HIDDEN_IS_CHAIN;
- vr->desc[vr->next_idx].next = vr->next_idx;
- vr->desc[vr->next_idx].next++;
- vr->next_idx++;
-
- /* Chains only have a single ID */
- if (!(flags & VRING_DESC_F_NEXT)) {
- vr->avail->idx++;
- }
-}
-
-static u64 get_clock(void)
-{
- u64 r;
-
- asm volatile("stck %0" : "=Q" (r) : : "cc");
- return r;
-}
-
-ulong get_second(void)
-{
- return (get_clock() >> 12) / 1000000;
-}
-
-static int vr_poll(VRing *vr)
-{
- if (vr->used->idx == vr->used_idx) {
- vring_notify(vr);
- yield();
- return 0;
- }
-
- vr->used_idx = vr->used->idx;
- vr->next_idx = 0;
- vr->desc[0].len = 0;
- vr->desc[0].flags = 0;
- return 1; /* vr has been updated */
-}
-
-/*
- * Wait for the host to reply.
- *
- * timeout is in seconds if > 0.
- *
- * Returns 0 on success, 1 on timeout.
- */
-static int vring_wait_reply(void)
-{
- 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 < vdev.nr_vqs; i++) {
- r += vr_poll(&vdev.vrings[i]);
- }
- yield();
- if (r) {
- return 0;
- }
- } while (!vdev.wait_reply_timeout || (get_second() < target_second));
-
- return 1;
-}
-
-int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd)
-{
- VRing *vr = &vdev->vrings[vqid];
- int i = 0;
-
- do {
- vring_send_buf(vr, cmd[i].data, cmd[i].size,
- cmd[i].flags | (i ? VRING_HIDDEN_IS_CHAIN : 0));
- } while (cmd[i++].flags & VRING_DESC_F_NEXT);
-
- vring_wait_reply();
- if (drain_irqs(vr->schid)) {
- return -1;
- }
- return 0;
-}
-
-/***********************************************
- * Virtio block *
- ***********************************************/
-
-static int virtio_blk_read_many(VDev *vdev,
- ulong sector, void *load_addr, int sec_num)
-{
- VirtioBlkOuthdr out_hdr;
- u8 status;
- 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(vr, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
-
- /* This is where we want to receive data */
- 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(vr, &status, sizeof(u8),
- VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN);
-
- /* Now we can tell the host to read */
- vring_wait_reply();
-
- if (drain_irqs(vr->schid)) {
- /* Well, whatever status is supposed to contain... */
- status = 1;
- }
- return status;
-}
-
-int virtio_read_many(ulong sector, void *load_addr, int sec_num)
-{
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- return virtio_blk_read_many(&vdev, sector, load_addr, sec_num);
- case VIRTIO_ID_SCSI:
- return virtio_scsi_read_many(&vdev, sector, load_addr, sec_num);
- }
- panic("\n! No readable IPL device !\n");
- return -1;
-}
-
-unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
- ulong subchan_id, void *load_addr)
-{
- u8 status;
- int sec = rec_list1;
- int sec_num = ((rec_list2 >> 32) & 0xffff) + 1;
- int sec_len = rec_list2 >> 48;
- ulong addr = (ulong)load_addr;
-
- if (sec_len != virtio_get_block_size()) {
- return -1;
- }
-
- sclp_print(".");
- status = virtio_read_many(sec, (void *)addr, sec_num);
- if (status) {
- panic("I/O Error");
- }
- addr += sec_num * virtio_get_block_size();
-
- return addr;
-}
-
-int virtio_read(ulong sector, void *load_addr)
-{
- return virtio_read_many(sector, load_addr, 1);
-}
-
-/*
- * 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;
-}
-
-VirtioGDN virtio_guessed_disk_nature(void)
-{
- return vdev.guessed_disk_nature;
-}
-
-void virtio_assume_scsi(void)
-{
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- vdev.guessed_disk_nature = VIRTIO_GDN_SCSI;
- vdev.config.blk.blk_size = VIRTIO_SCSI_BLOCK_SIZE;
- vdev.config.blk.physical_block_exp = 0;
- vdev.blk_factor = 1;
- break;
- case VIRTIO_ID_SCSI:
- vdev.scsi_block_size = VIRTIO_SCSI_BLOCK_SIZE;
- break;
- }
-}
-
-void virtio_assume_iso9660(void)
-{
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- vdev.guessed_disk_nature = VIRTIO_GDN_SCSI;
- vdev.config.blk.blk_size = VIRTIO_ISO_BLOCK_SIZE;
- vdev.config.blk.physical_block_exp = 0;
- vdev.blk_factor = VIRTIO_ISO_BLOCK_SIZE / VIRTIO_SECTOR_SIZE;
- break;
- case VIRTIO_ID_SCSI:
- vdev.scsi_block_size = VIRTIO_ISO_BLOCK_SIZE;
- break;
- }
-}
-
-void virtio_assume_eckd(void)
-{
- vdev.guessed_disk_nature = VIRTIO_GDN_DASD;
- vdev.blk_factor = 1;
- vdev.config.blk.physical_block_exp = 0;
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- vdev.config.blk.blk_size = 4096;
- break;
- case VIRTIO_ID_SCSI:
- vdev.config.blk.blk_size = vdev.scsi_block_size;
- break;
- }
- vdev.config.blk.geometry.heads = 15;
- vdev.config.blk.geometry.sectors =
- virtio_eckd_sectors_for_block_size(vdev.config.blk.blk_size);
-}
-
-bool virtio_disk_is_scsi(void)
-{
- if (vdev.guessed_disk_nature == VIRTIO_GDN_SCSI) {
- return true;
- }
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- return (vdev.config.blk.geometry.heads == 255)
- && (vdev.config.blk.geometry.sectors == 63)
- && (virtio_get_block_size() == VIRTIO_SCSI_BLOCK_SIZE);
- case VIRTIO_ID_SCSI:
- return true;
- }
- return false;
-}
-
-bool virtio_disk_is_eckd(void)
-{
- const int block_size = virtio_get_block_size();
-
- if (vdev.guessed_disk_nature == VIRTIO_GDN_DASD) {
- return true;
- }
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- return (vdev.config.blk.geometry.heads == 15)
- && (vdev.config.blk.geometry.sectors ==
- virtio_eckd_sectors_for_block_size(block_size));
- case VIRTIO_ID_SCSI:
- return false;
- }
- return false;
-}
-
-bool virtio_ipl_disk_is_valid(void)
-{
- return virtio_disk_is_scsi() || virtio_disk_is_eckd();
-}
-
-int virtio_get_block_size(void)
-{
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- return vdev.config.blk.blk_size << vdev.config.blk.physical_block_exp;
- case VIRTIO_ID_SCSI:
- return vdev.scsi_block_size;
- }
- return 0;
-}
-
-uint8_t virtio_get_heads(void)
-{
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- return vdev.config.blk.geometry.heads;
- case VIRTIO_ID_SCSI:
- return vdev.guessed_disk_nature == VIRTIO_GDN_DASD
- ? vdev.config.blk.geometry.heads : 255;
- }
- return 0;
-}
-
-uint8_t virtio_get_sectors(void)
-{
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- return vdev.config.blk.geometry.sectors;
- case VIRTIO_ID_SCSI:
- return vdev.guessed_disk_nature == VIRTIO_GDN_DASD
- ? vdev.config.blk.geometry.sectors : 63;
- }
- return 0;
-}
-
-uint64_t virtio_get_blocks(void)
-{
- const uint64_t factor = virtio_get_block_size() / VIRTIO_SECTOR_SIZE;
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- return vdev.config.blk.capacity / factor;
- case VIRTIO_ID_SCSI:
- return vdev.scsi_last_block / factor;
- }
- return 0;
-}
-
-static void virtio_setup_ccw(VDev *vdev)
-{
- int i, cfg_size = 0;
- unsigned char status = VIRTIO_CONFIG_S_DRIVER_OK;
-
- IPL_assert(virtio_is_supported(vdev->schid), "PE");
- /* device ID has been established now */
-
- vdev->config.blk.blk_size = 0; /* mark "illegal" - setup started... */
- vdev->guessed_disk_nature = VIRTIO_GDN_NONE;
-
- 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;
- case VIRTIO_ID_SCSI:
- vdev->nr_vqs = 3;
- vdev->cmd_vr_idx = VR_REQUEST;
- cfg_size = sizeof(vdev->config.scsi);
- 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");
-
- /*
- * 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.
- */
-
- 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,
- .index = i,
- .num = 0,
- };
- VqConfig config = {
- .index = i,
- .num = 0,
- };
-
- IPL_assert(
- 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(&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");
- }
- IPL_assert(
- run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status)) == 0,
- "Could not write status to host");
-}
-
-void virtio_setup_device(SubChannelId schid)
-{
- vdev.schid = schid;
- virtio_setup_ccw(&vdev);
-
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- sclp_print("Using virtio-blk.\n");
- if (!virtio_ipl_disk_is_valid()) {
- /* make sure all getters but blocksize return 0 for
- * invalid IPL disk
- */
- memset(&vdev.config.blk, 0, sizeof(vdev.config.blk));
- virtio_assume_scsi();
- }
- break;
- case VIRTIO_ID_SCSI:
- IPL_assert(vdev.config.scsi.sense_size == VIRTIO_SCSI_SENSE_SIZE,
- "Config: sense size mismatch");
- IPL_assert(vdev.config.scsi.cdb_size == VIRTIO_SCSI_CDB_SIZE,
- "Config: CDB size mismatch");
-
- sclp_print("Using virtio-scsi.\n");
- virtio_scsi_setup(&vdev);
- break;
- default:
- panic("\n! No IPL device available !\n");
- }
-}
-
-bool virtio_is_supported(SubChannelId schid)
-{
- vdev.schid = schid;
- memset(&vdev.senseid, 0, sizeof(vdev.senseid));
- /* run sense id command */
- if (run_ccw(&vdev, CCW_CMD_SENSE_ID, &vdev.senseid, sizeof(vdev.senseid))) {
- return false;
- }
- if (vdev.senseid.cu_type == 0x3832) {
- switch (vdev.senseid.cu_model) {
- case VIRTIO_ID_BLOCK:
- case VIRTIO_ID_SCSI:
- return true;
- }
- }
- return false;
-}
-
-int enable_mss_facility(void)
-{
- int ret;
- ChscAreaSda *sda_area = (ChscAreaSda *) 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;
-}