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pc-bios/s390-ccw: add virtio-scsi implementation
Add virtio-scsi.[ch] with primary implementation of virtio-scsi. 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
Cornelia Huck
parent
f791561476
commit
86aec22d48
2 changed files with 414 additions and 0 deletions
342
pc-bios/s390-ccw/virtio-scsi.c
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342
pc-bios/s390-ccw/virtio-scsi.c
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/*
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* Virtio-SCSI implementation for s390 machine loader for qemu
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*
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* Copyright 2015 IBM Corp.
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* Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "s390-ccw.h"
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#include "virtio.h"
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#include "scsi.h"
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#include "virtio-scsi.h"
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static ScsiDevice default_scsi_device;
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static VirtioScsiCmdReq req;
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static VirtioScsiCmdResp resp;
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static uint8_t scsi_inquiry_std_response[256];
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static inline void vs_assert(bool term, const char **msgs)
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{
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if (!term) {
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int i = 0;
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sclp_print("\n! ");
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while (msgs[i]) {
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sclp_print(msgs[i++]);
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}
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panic(" !\n");
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}
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}
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static void virtio_scsi_verify_response(VirtioScsiCmdResp *resp,
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const char *title)
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{
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const char *mr[] = {
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title, ": response ", virtio_scsi_response_msg(resp), 0
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};
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const char *ms[] = {
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title,
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CDB_STATUS_VALID(resp->status) ? ": " : ": invalid ",
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scsi_cdb_status_msg(resp->status),
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resp->status == CDB_STATUS_CHECK_CONDITION ? " " : 0,
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resp->sense_len ? scsi_cdb_asc_msg(resp->sense)
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: "no sense data",
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scsi_sense_response(resp->sense) == 0x70 ? ", sure" : "?",
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0
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};
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vs_assert(resp->response == VIRTIO_SCSI_S_OK, mr);
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vs_assert(resp->status == CDB_STATUS_GOOD, ms);
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}
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static void prepare_request(VDev *vdev, const void *cdb, int cdb_size,
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void *data, uint32_t data_size)
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{
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const ScsiDevice *sdev = vdev->scsi_device;
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memset(&req, 0, sizeof(req));
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req.lun = make_lun(sdev->channel, sdev->target, sdev->lun);
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memcpy(&req.cdb, cdb, cdb_size);
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memset(&resp, 0, sizeof(resp));
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resp.status = 0xff; /* set invalid */
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resp.response = 0xff; /* */
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if (data && data_size) {
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memset(data, 0, data_size);
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}
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}
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static inline void vs_io_assert(bool term, const char *msg)
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{
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if (!term) {
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virtio_scsi_verify_response(&resp, msg);
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}
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}
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static void vs_run(const char *title, VirtioCmd *cmd, VDev *vdev,
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const void *cdb, int cdb_size,
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void *data, uint32_t data_size)
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{
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prepare_request(vdev, cdb, cdb_size, data, data_size);
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vs_io_assert(virtio_run(vdev, VR_REQUEST, cmd) == 0, title);
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}
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/* SCSI protocol implementation routines */
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static bool scsi_inquiry(VDev *vdev, void *data, uint32_t data_size)
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{
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ScsiCdbInquiry cdb = {
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.command = 0x12,
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.alloc_len = data_size < 65535 ? data_size : 65535,
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};
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VirtioCmd inquiry[] = {
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{ &req, sizeof(req), VRING_DESC_F_NEXT },
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{ &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT },
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{ data, data_size, VRING_DESC_F_WRITE },
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};
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vs_run("inquiry", inquiry, vdev, &cdb, sizeof(cdb), data, data_size);
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return virtio_scsi_response_ok(&resp);
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}
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static bool scsi_test_unit_ready(VDev *vdev)
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{
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ScsiCdbTestUnitReady cdb = {
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.command = 0x00,
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};
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VirtioCmd test_unit_ready[] = {
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{ &req, sizeof(req), VRING_DESC_F_NEXT },
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{ &resp, sizeof(resp), VRING_DESC_F_WRITE },
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};
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prepare_request(vdev, &cdb, sizeof(cdb), 0, 0);
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virtio_run(vdev, VR_REQUEST, test_unit_ready); /* ignore errors here */
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return virtio_scsi_response_ok(&resp);
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}
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static bool scsi_report_luns(VDev *vdev, void *data, uint32_t data_size)
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{
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ScsiCdbReportLuns cdb = {
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.command = 0xa0,
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.select_report = 0x02, /* REPORT ALL */
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.alloc_len = data_size,
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};
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VirtioCmd report_luns[] = {
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{ &req, sizeof(req), VRING_DESC_F_NEXT },
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{ &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT },
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{ data, data_size, VRING_DESC_F_WRITE },
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};
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vs_run("report luns", report_luns,
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vdev, &cdb, sizeof(cdb), data, data_size);
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return virtio_scsi_response_ok(&resp);
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}
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static bool scsi_read_10(VDev *vdev,
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ulong sector, int sectors, void *data)
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{
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int f = vdev->blk_factor;
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unsigned int data_size = sectors * virtio_get_block_size() * f;
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ScsiCdbRead10 cdb = {
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.command = 0x28,
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.lba = sector * f,
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.xfer_length = sectors * f,
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};
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VirtioCmd read_10[] = {
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{ &req, sizeof(req), VRING_DESC_F_NEXT },
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{ &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT },
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{ data, data_size * f, VRING_DESC_F_WRITE },
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};
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debug_print_int("read_10 sector", sector);
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debug_print_int("read_10 sectors", sectors);
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vs_run("read(10)", read_10, vdev, &cdb, sizeof(cdb), data, data_size);
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return virtio_scsi_response_ok(&resp);
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}
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static bool scsi_read_capacity(VDev *vdev,
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void *data, uint32_t data_size)
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{
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ScsiCdbReadCapacity16 cdb = {
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.command = 0x9e, /* SERVICE_ACTION_IN_16 */
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.service_action = 0x10, /* SA_READ_CAPACITY */
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.alloc_len = data_size,
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};
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VirtioCmd read_capacity_16[] = {
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{ &req, sizeof(req), VRING_DESC_F_NEXT },
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{ &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT },
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{ data, data_size, VRING_DESC_F_WRITE },
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};
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vs_run("read capacity", read_capacity_16,
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vdev, &cdb, sizeof(cdb), data, data_size);
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return virtio_scsi_response_ok(&resp);
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}
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/* virtio-scsi routines */
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static void virtio_scsi_locate_device(VDev *vdev)
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{
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const uint16_t channel = 0; /* again, it's what QEMU does */
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uint16_t target;
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static uint8_t data[16 + 8 * 63];
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ScsiLunReport *r = (void *) data;
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ScsiDevice *sdev = vdev->scsi_device;
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int i, luns;
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/* QEMU has hardcoded channel #0 in many places.
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* If this hardcoded value is ever changed, we'll need to add code for
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* vdev->config.scsi.max_channel != 0 here.
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*/
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debug_print_int("config.scsi.max_channel", vdev->config.scsi.max_channel);
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debug_print_int("config.scsi.max_target ", vdev->config.scsi.max_target);
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debug_print_int("config.scsi.max_lun ", vdev->config.scsi.max_lun);
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for (target = 0; target <= vdev->config.scsi.max_target; target++) {
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sdev->channel = channel;
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sdev->target = target; /* sdev->lun will be 0 here */
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if (!scsi_report_luns(vdev, data, sizeof(data))) {
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if (resp.response == VIRTIO_SCSI_S_BAD_TARGET) {
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continue;
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}
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print_int("target", target);
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virtio_scsi_verify_response(&resp, "SCSI cannot report LUNs");
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}
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if (r->lun_list_len == 0) {
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print_int("no LUNs for target", target);
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continue;
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}
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luns = r->lun_list_len / 8;
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debug_print_int("LUNs reported", luns);
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if (luns == 1) {
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/* There is no ",lun=#" arg for -device or ",lun=0" given.
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* Hence, the only LUN reported.
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* Usually, it's 0.
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*/
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sdev->lun = r->lun[0].v16[0]; /* it's returned this way */
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debug_print_int("Have to use LUN", sdev->lun);
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return; /* we have to use this device */
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}
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for (i = 0; i < luns; i++) {
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if (r->lun[i].v64) {
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/* Look for non-zero LUN - we have where to choose from */
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sdev->lun = r->lun[i].v16[0];
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debug_print_int("Will use LUN", sdev->lun);
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return; /* we have found a device */
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}
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}
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}
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panic("\n! Cannot locate virtio-scsi device !\n");
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}
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int virtio_scsi_read_many(VDev *vdev,
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ulong sector, void *load_addr, int sec_num)
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{
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if (!scsi_read_10(vdev, sector, sec_num, load_addr)) {
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virtio_scsi_verify_response(&resp, "virtio-scsi:read_many");
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}
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return 0;
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}
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static bool virtio_scsi_inquiry_response_is_cdrom(void *data)
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{
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const ScsiInquiryStd *response = data;
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const int resp_data_fmt = response->b3 & 0x0f;
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int i;
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IPL_check(resp_data_fmt == 2, "Wrong INQUIRY response format");
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if (resp_data_fmt != 2) {
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return false; /* cannot decode */
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}
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if ((response->peripheral_qdt & 0x1f) == SCSI_INQ_RDT_CDROM) {
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return true;
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}
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for (i = 0; i < sizeof(response->prod_id); i++) {
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if (response->prod_id[i] != QEMU_CDROM_SIGNATURE[i]) {
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return false;
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}
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}
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return true;
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}
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static void scsi_parse_capacity_report(void *data,
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uint64_t *last_lba, uint32_t *lb_len)
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{
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ScsiReadCapacity16Data *p = data;
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if (last_lba) {
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*last_lba = p->ret_lba;
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}
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if (lb_len) {
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*lb_len = p->lb_len;
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}
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}
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void virtio_scsi_setup(VDev *vdev)
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{
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int retry_test_unit_ready = 3;
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uint8_t data[256];
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uint32_t data_size = sizeof(data);
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vdev->scsi_device = &default_scsi_device;
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virtio_scsi_locate_device(vdev);
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/* We have to "ping" the device before it becomes readable */
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while (!scsi_test_unit_ready(vdev)) {
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if (!virtio_scsi_response_ok(&resp)) {
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uint8_t code = resp.sense[0] & SCSI_SENSE_CODE_MASK;
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uint8_t sense_key = resp.sense[2] & SCSI_SENSE_KEY_MASK;
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IPL_assert(resp.sense_len != 0, "virtio-scsi:setup: no SENSE data");
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IPL_assert(retry_test_unit_ready && code == 0x70 &&
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sense_key == SCSI_SENSE_KEY_UNIT_ATTENTION,
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"virtio-scsi:setup: cannot retry");
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/* retry on CHECK_CONDITION/UNIT_ATTENTION as it
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* may not designate a real error, but it may be
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* a result of device reset, etc.
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*/
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retry_test_unit_ready--;
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sleep(1);
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continue;
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}
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virtio_scsi_verify_response(&resp, "virtio-scsi:setup");
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}
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/* read and cache SCSI INQUIRY response */
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if (!scsi_inquiry(vdev, scsi_inquiry_std_response,
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sizeof(scsi_inquiry_std_response))) {
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virtio_scsi_verify_response(&resp, "virtio-scsi:setup:inquiry");
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}
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if (virtio_scsi_inquiry_response_is_cdrom(scsi_inquiry_std_response)) {
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sclp_print("SCSI CD-ROM detected.\n");
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vdev->is_cdrom = true;
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vdev->scsi_block_size = VIRTIO_ISO_BLOCK_SIZE;
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}
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if (!scsi_read_capacity(vdev, data, data_size)) {
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virtio_scsi_verify_response(&resp, "virtio-scsi:setup:read_capacity");
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}
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scsi_parse_capacity_report(data, &vdev->scsi_last_block,
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(uint32_t *) &vdev->scsi_block_size);
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}
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72
pc-bios/s390-ccw/virtio-scsi.h
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72
pc-bios/s390-ccw/virtio-scsi.h
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/*
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* Virtio-SCSI definitions for s390 machine loader for qemu
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*
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* Copyright 2015 IBM Corp.
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* Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef VIRTIO_SCSI_H
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#define VIRTIO_SCSI_H
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#include "s390-ccw.h"
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#include "virtio.h"
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#include "scsi.h"
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#define VIRTIO_SCSI_CDB_SIZE SCSI_DEFAULT_CDB_SIZE
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#define VIRTIO_SCSI_SENSE_SIZE SCSI_DEFAULT_SENSE_SIZE
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/* command-specific response values */
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#define VIRTIO_SCSI_S_OK 0x00
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#define VIRTIO_SCSI_S_BAD_TARGET 0x03
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#define QEMU_CDROM_SIGNATURE "QEMU CD-ROM "
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enum virtio_scsi_vq_id {
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VR_CONTROL = 0,
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VR_EVENT = 1,
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VR_REQUEST = 2,
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};
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struct VirtioScsiCmdReq {
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ScsiLun lun;
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uint64_t id;
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uint8_t task_attr; /* = 0 = VIRTIO_SCSI_S_SIMPLE */
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uint8_t prio;
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uint8_t crn; /* = 0 */
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uint8_t cdb[VIRTIO_SCSI_CDB_SIZE];
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} __attribute__((packed));
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typedef struct VirtioScsiCmdReq VirtioScsiCmdReq;
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struct VirtioScsiCmdResp {
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uint32_t sense_len;
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uint32_t residual;
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uint16_t status_qualifier;
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uint8_t status; /* first check for .response */
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uint8_t response; /* then for .status */
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uint8_t sense[VIRTIO_SCSI_SENSE_SIZE];
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} __attribute__((packed));
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typedef struct VirtioScsiCmdResp VirtioScsiCmdResp;
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static inline const char *virtio_scsi_response_msg(const VirtioScsiCmdResp *r)
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{
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static char err_msg[] = "VS RESP=XX";
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uint8_t v = r->response;
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fill_hex_val(err_msg + 8, &v, 1);
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return err_msg;
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}
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static inline bool virtio_scsi_response_ok(const VirtioScsiCmdResp *r)
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{
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return r->response == VIRTIO_SCSI_S_OK && r->status == CDB_STATUS_GOOD;
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}
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void virtio_scsi_setup(VDev *vdev);
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int virtio_scsi_read_many(VDev *vdev,
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ulong sector, void *load_addr, int sec_num);
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#endif /* VIRTIO_SCSI_H */
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