@@ -5,7 +5,6 @@ common-obj-$(CONFIG_NAND) += nand.o
common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
common-obj-$(CONFIG_XEN) += xen-block.o
-common-obj-$(CONFIG_XEN) += xen_disk.o
common-obj-$(CONFIG_ECC) += ecc.o
common-obj-$(CONFIG_ONENAND) += onenand.o
common-obj-$(CONFIG_NVME_PCI) += nvme.o
deleted file mode 100644
@@ -1,1011 +0,0 @@
-/*
- * xen paravirt block device backend
- *
- * (c) Gerd Hoffmann <kraxel@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; under version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, see <http://www.gnu.org/licenses/>.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/osdep.h"
-#include "qemu/units.h"
-#include <sys/ioctl.h>
-#include <sys/uio.h>
-
-#include "hw/hw.h"
-#include "hw/xen/xen-legacy-backend.h"
-#include "xen_blkif.h"
-#include "sysemu/blockdev.h"
-#include "sysemu/iothread.h"
-#include "sysemu/block-backend.h"
-#include "qapi/error.h"
-#include "qapi/qmp/qdict.h"
-#include "qapi/qmp/qstring.h"
-#include "trace.h"
-
-/* ------------------------------------------------------------- */
-
-#define BLOCK_SIZE 512
-#define IOCB_COUNT (BLKIF_MAX_SEGMENTS_PER_REQUEST + 2)
-
-struct ioreq {
- blkif_request_t req;
- int16_t status;
-
- /* parsed request */
- off_t start;
- QEMUIOVector v;
- void *buf;
- size_t size;
- int presync;
-
- /* aio status */
- int aio_inflight;
- int aio_errors;
-
- struct XenBlkDev *blkdev;
- QLIST_ENTRY(ioreq) list;
- BlockAcctCookie acct;
-};
-
-#define MAX_RING_PAGE_ORDER 4
-
-struct XenBlkDev {
- struct XenLegacyDevice xendev; /* must be first */
- char *params;
- char *mode;
- char *type;
- char *dev;
- char *devtype;
- bool directiosafe;
- const char *fileproto;
- const char *filename;
- unsigned int ring_ref[1 << MAX_RING_PAGE_ORDER];
- unsigned int nr_ring_ref;
- void *sring;
- int64_t file_blk;
- int64_t file_size;
- int protocol;
- blkif_back_rings_t rings;
- int more_work;
-
- /* request lists */
- QLIST_HEAD(inflight_head, ioreq) inflight;
- QLIST_HEAD(finished_head, ioreq) finished;
- QLIST_HEAD(freelist_head, ioreq) freelist;
- int requests_total;
- int requests_inflight;
- int requests_finished;
- unsigned int max_requests;
-
- gboolean feature_discard;
-
- /* qemu block driver */
- DriveInfo *dinfo;
- BlockBackend *blk;
- QEMUBH *bh;
-
- IOThread *iothread;
- AioContext *ctx;
-};
-
-/* ------------------------------------------------------------- */
-
-static void ioreq_reset(struct ioreq *ioreq)
-{
- memset(&ioreq->req, 0, sizeof(ioreq->req));
- ioreq->status = 0;
- ioreq->start = 0;
- ioreq->buf = NULL;
- ioreq->size = 0;
- ioreq->presync = 0;
-
- ioreq->aio_inflight = 0;
- ioreq->aio_errors = 0;
-
- ioreq->blkdev = NULL;
- memset(&ioreq->list, 0, sizeof(ioreq->list));
- memset(&ioreq->acct, 0, sizeof(ioreq->acct));
-
- qemu_iovec_reset(&ioreq->v);
-}
-
-static struct ioreq *ioreq_start(struct XenBlkDev *blkdev)
-{
- struct ioreq *ioreq = NULL;
-
- if (QLIST_EMPTY(&blkdev->freelist)) {
- if (blkdev->requests_total >= blkdev->max_requests) {
- goto out;
- }
- /* allocate new struct */
- ioreq = g_malloc0(sizeof(*ioreq));
- ioreq->blkdev = blkdev;
- blkdev->requests_total++;
- qemu_iovec_init(&ioreq->v, 1);
- } else {
- /* get one from freelist */
- ioreq = QLIST_FIRST(&blkdev->freelist);
- QLIST_REMOVE(ioreq, list);
- }
- QLIST_INSERT_HEAD(&blkdev->inflight, ioreq, list);
- blkdev->requests_inflight++;
-
-out:
- return ioreq;
-}
-
-static void ioreq_finish(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
-
- QLIST_REMOVE(ioreq, list);
- QLIST_INSERT_HEAD(&blkdev->finished, ioreq, list);
- blkdev->requests_inflight--;
- blkdev->requests_finished++;
-}
-
-static void ioreq_release(struct ioreq *ioreq, bool finish)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
-
- QLIST_REMOVE(ioreq, list);
- ioreq_reset(ioreq);
- ioreq->blkdev = blkdev;
- QLIST_INSERT_HEAD(&blkdev->freelist, ioreq, list);
- if (finish) {
- blkdev->requests_finished--;
- } else {
- blkdev->requests_inflight--;
- }
-}
-
-/*
- * translate request into iovec + start offset
- * do sanity checks along the way
- */
-static int ioreq_parse(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
- struct XenLegacyDevice *xendev = &blkdev->xendev;
- size_t len;
- int i;
-
- xen_pv_printf(xendev, 3,
- "op %d, nr %d, handle %d, id %" PRId64 ", sector %" PRId64 "\n",
- ioreq->req.operation, ioreq->req.nr_segments,
- ioreq->req.handle, ioreq->req.id, ioreq->req.sector_number);
- switch (ioreq->req.operation) {
- case BLKIF_OP_READ:
- break;
- case BLKIF_OP_FLUSH_DISKCACHE:
- ioreq->presync = 1;
- if (!ioreq->req.nr_segments) {
- return 0;
- }
- /* fall through */
- case BLKIF_OP_WRITE:
- break;
- case BLKIF_OP_DISCARD:
- return 0;
- default:
- xen_pv_printf(xendev, 0, "error: unknown operation (%d)\n",
- ioreq->req.operation);
- goto err;
- };
-
- if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') {
- xen_pv_printf(xendev, 0, "error: write req for ro device\n");
- goto err;
- }
-
- ioreq->start = ioreq->req.sector_number * blkdev->file_blk;
- for (i = 0; i < ioreq->req.nr_segments; i++) {
- if (i == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
- xen_pv_printf(xendev, 0, "error: nr_segments too big\n");
- goto err;
- }
- if (ioreq->req.seg[i].first_sect > ioreq->req.seg[i].last_sect) {
- xen_pv_printf(xendev, 0, "error: first > last sector\n");
- goto err;
- }
- if (ioreq->req.seg[i].last_sect * BLOCK_SIZE >= XC_PAGE_SIZE) {
- xen_pv_printf(xendev, 0, "error: page crossing\n");
- goto err;
- }
-
- len = (ioreq->req.seg[i].last_sect - ioreq->req.seg[i].first_sect + 1) * blkdev->file_blk;
- ioreq->size += len;
- }
- if (ioreq->start + ioreq->size > blkdev->file_size) {
- xen_pv_printf(xendev, 0, "error: access beyond end of file\n");
- goto err;
- }
- return 0;
-
-err:
- ioreq->status = BLKIF_RSP_ERROR;
- return -1;
-}
-
-static int ioreq_grant_copy(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
- struct XenLegacyDevice *xendev = &blkdev->xendev;
- XenGrantCopySegment segs[BLKIF_MAX_SEGMENTS_PER_REQUEST];
- int i, count, rc;
- int64_t file_blk = blkdev->file_blk;
- bool to_domain = (ioreq->req.operation == BLKIF_OP_READ);
- void *virt = ioreq->buf;
-
- if (ioreq->req.nr_segments == 0) {
- return 0;
- }
-
- count = ioreq->req.nr_segments;
-
- for (i = 0; i < count; i++) {
- if (to_domain) {
- segs[i].dest.foreign.ref = ioreq->req.seg[i].gref;
- segs[i].dest.foreign.offset = ioreq->req.seg[i].first_sect * file_blk;
- segs[i].source.virt = virt;
- } else {
- segs[i].source.foreign.ref = ioreq->req.seg[i].gref;
- segs[i].source.foreign.offset = ioreq->req.seg[i].first_sect * file_blk;
- segs[i].dest.virt = virt;
- }
- segs[i].len = (ioreq->req.seg[i].last_sect
- - ioreq->req.seg[i].first_sect + 1) * file_blk;
- virt += segs[i].len;
- }
-
- rc = xen_be_copy_grant_refs(xendev, to_domain, segs, count);
-
- if (rc) {
- xen_pv_printf(xendev, 0,
- "failed to copy data %d\n", rc);
- ioreq->aio_errors++;
- return -1;
- }
-
- return rc;
-}
-
-static int ioreq_runio_qemu_aio(struct ioreq *ioreq);
-
-static void qemu_aio_complete(void *opaque, int ret)
-{
- struct ioreq *ioreq = opaque;
- struct XenBlkDev *blkdev = ioreq->blkdev;
- struct XenLegacyDevice *xendev = &blkdev->xendev;
-
- aio_context_acquire(blkdev->ctx);
-
- if (ret != 0) {
- xen_pv_printf(xendev, 0, "%s I/O error\n",
- ioreq->req.operation == BLKIF_OP_READ ? "read" : "write");
- ioreq->aio_errors++;
- }
-
- ioreq->aio_inflight--;
- if (ioreq->presync) {
- ioreq->presync = 0;
- ioreq_runio_qemu_aio(ioreq);
- goto done;
- }
- if (ioreq->aio_inflight > 0) {
- goto done;
- }
-
- switch (ioreq->req.operation) {
- case BLKIF_OP_READ:
- /* in case of failure ioreq->aio_errors is increased */
- if (ret == 0) {
- ioreq_grant_copy(ioreq);
- }
- qemu_vfree(ioreq->buf);
- break;
- case BLKIF_OP_WRITE:
- case BLKIF_OP_FLUSH_DISKCACHE:
- if (!ioreq->req.nr_segments) {
- break;
- }
- qemu_vfree(ioreq->buf);
- break;
- default:
- break;
- }
-
- ioreq->status = ioreq->aio_errors ? BLKIF_RSP_ERROR : BLKIF_RSP_OKAY;
- ioreq_finish(ioreq);
-
- switch (ioreq->req.operation) {
- case BLKIF_OP_WRITE:
- case BLKIF_OP_FLUSH_DISKCACHE:
- if (!ioreq->req.nr_segments) {
- break;
- }
- case BLKIF_OP_READ:
- if (ioreq->status == BLKIF_RSP_OKAY) {
- block_acct_done(blk_get_stats(blkdev->blk), &ioreq->acct);
- } else {
- block_acct_failed(blk_get_stats(blkdev->blk), &ioreq->acct);
- }
- break;
- case BLKIF_OP_DISCARD:
- default:
- break;
- }
- qemu_bh_schedule(blkdev->bh);
-
-done:
- aio_context_release(blkdev->ctx);
-}
-
-static bool blk_split_discard(struct ioreq *ioreq, blkif_sector_t sector_number,
- uint64_t nr_sectors)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
- int64_t byte_offset;
- int byte_chunk;
- uint64_t byte_remaining, limit;
- uint64_t sec_start = sector_number;
- uint64_t sec_count = nr_sectors;
-
- /* Wrap around, or overflowing byte limit? */
- if (sec_start + sec_count < sec_count ||
- sec_start + sec_count > INT64_MAX >> BDRV_SECTOR_BITS) {
- return false;
- }
-
- limit = BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS;
- byte_offset = sec_start << BDRV_SECTOR_BITS;
- byte_remaining = sec_count << BDRV_SECTOR_BITS;
-
- do {
- byte_chunk = byte_remaining > limit ? limit : byte_remaining;
- ioreq->aio_inflight++;
- blk_aio_pdiscard(blkdev->blk, byte_offset, byte_chunk,
- qemu_aio_complete, ioreq);
- byte_remaining -= byte_chunk;
- byte_offset += byte_chunk;
- } while (byte_remaining > 0);
-
- return true;
-}
-
-static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
-
- ioreq->buf = qemu_memalign(XC_PAGE_SIZE, ioreq->size);
- if (ioreq->req.nr_segments &&
- (ioreq->req.operation == BLKIF_OP_WRITE ||
- ioreq->req.operation == BLKIF_OP_FLUSH_DISKCACHE) &&
- ioreq_grant_copy(ioreq)) {
- qemu_vfree(ioreq->buf);
- goto err;
- }
-
- ioreq->aio_inflight++;
- if (ioreq->presync) {
- blk_aio_flush(ioreq->blkdev->blk, qemu_aio_complete, ioreq);
- return 0;
- }
-
- switch (ioreq->req.operation) {
- case BLKIF_OP_READ:
- qemu_iovec_add(&ioreq->v, ioreq->buf, ioreq->size);
- block_acct_start(blk_get_stats(blkdev->blk), &ioreq->acct,
- ioreq->v.size, BLOCK_ACCT_READ);
- ioreq->aio_inflight++;
- blk_aio_preadv(blkdev->blk, ioreq->start, &ioreq->v, 0,
- qemu_aio_complete, ioreq);
- break;
- case BLKIF_OP_WRITE:
- case BLKIF_OP_FLUSH_DISKCACHE:
- if (!ioreq->req.nr_segments) {
- break;
- }
-
- qemu_iovec_add(&ioreq->v, ioreq->buf, ioreq->size);
- block_acct_start(blk_get_stats(blkdev->blk), &ioreq->acct,
- ioreq->v.size,
- ioreq->req.operation == BLKIF_OP_WRITE ?
- BLOCK_ACCT_WRITE : BLOCK_ACCT_FLUSH);
- ioreq->aio_inflight++;
- blk_aio_pwritev(blkdev->blk, ioreq->start, &ioreq->v, 0,
- qemu_aio_complete, ioreq);
- break;
- case BLKIF_OP_DISCARD:
- {
- struct blkif_request_discard *req = (void *)&ioreq->req;
- if (!blk_split_discard(ioreq, req->sector_number, req->nr_sectors)) {
- goto err;
- }
- break;
- }
- default:
- /* unknown operation (shouldn't happen -- parse catches this) */
- goto err;
- }
-
- qemu_aio_complete(ioreq, 0);
-
- return 0;
-
-err:
- ioreq_finish(ioreq);
- ioreq->status = BLKIF_RSP_ERROR;
- return -1;
-}
-
-static int blk_send_response_one(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
- int send_notify = 0;
- int have_requests = 0;
- blkif_response_t *resp;
-
- /* Place on the response ring for the relevant domain. */
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- resp = (blkif_response_t *) RING_GET_RESPONSE(&blkdev->rings.native,
- blkdev->rings.native.rsp_prod_pvt);
- break;
- case BLKIF_PROTOCOL_X86_32:
- resp = (blkif_response_t *) RING_GET_RESPONSE(&blkdev->rings.x86_32_part,
- blkdev->rings.x86_32_part.rsp_prod_pvt);
- break;
- case BLKIF_PROTOCOL_X86_64:
- resp = (blkif_response_t *) RING_GET_RESPONSE(&blkdev->rings.x86_64_part,
- blkdev->rings.x86_64_part.rsp_prod_pvt);
- break;
- default:
- return 0;
- }
-
- resp->id = ioreq->req.id;
- resp->operation = ioreq->req.operation;
- resp->status = ioreq->status;
-
- blkdev->rings.common.rsp_prod_pvt++;
-
- RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blkdev->rings.common, send_notify);
- if (blkdev->rings.common.rsp_prod_pvt == blkdev->rings.common.req_cons) {
- /*
- * Tail check for pending requests. Allows frontend to avoid
- * notifications if requests are already in flight (lower
- * overheads and promotes batching).
- */
- RING_FINAL_CHECK_FOR_REQUESTS(&blkdev->rings.common, have_requests);
- } else if (RING_HAS_UNCONSUMED_REQUESTS(&blkdev->rings.common)) {
- have_requests = 1;
- }
-
- if (have_requests) {
- blkdev->more_work++;
- }
- return send_notify;
-}
-
-/* walk finished list, send outstanding responses, free requests */
-static void blk_send_response_all(struct XenBlkDev *blkdev)
-{
- struct ioreq *ioreq;
- int send_notify = 0;
-
- while (!QLIST_EMPTY(&blkdev->finished)) {
- ioreq = QLIST_FIRST(&blkdev->finished);
- send_notify += blk_send_response_one(ioreq);
- ioreq_release(ioreq, true);
- }
- if (send_notify) {
- xen_pv_send_notify(&blkdev->xendev);
- }
-}
-
-static int blk_get_request(struct XenBlkDev *blkdev, struct ioreq *ioreq, RING_IDX rc)
-{
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- memcpy(&ioreq->req, RING_GET_REQUEST(&blkdev->rings.native, rc),
- sizeof(ioreq->req));
- break;
- case BLKIF_PROTOCOL_X86_32:
- blkif_get_x86_32_req(&ioreq->req,
- RING_GET_REQUEST(&blkdev->rings.x86_32_part, rc));
- break;
- case BLKIF_PROTOCOL_X86_64:
- blkif_get_x86_64_req(&ioreq->req,
- RING_GET_REQUEST(&blkdev->rings.x86_64_part, rc));
- break;
- }
- /* Prevent the compiler from accessing the on-ring fields instead. */
- barrier();
- return 0;
-}
-
-static void blk_handle_requests(struct XenBlkDev *blkdev)
-{
- RING_IDX rc, rp;
- struct ioreq *ioreq;
-
- blkdev->more_work = 0;
-
- rc = blkdev->rings.common.req_cons;
- rp = blkdev->rings.common.sring->req_prod;
- xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
-
- blk_send_response_all(blkdev);
- while (rc != rp) {
- /* pull request from ring */
- if (RING_REQUEST_CONS_OVERFLOW(&blkdev->rings.common, rc)) {
- break;
- }
- ioreq = ioreq_start(blkdev);
- if (ioreq == NULL) {
- blkdev->more_work++;
- break;
- }
- blk_get_request(blkdev, ioreq, rc);
- blkdev->rings.common.req_cons = ++rc;
-
- /* parse them */
- if (ioreq_parse(ioreq) != 0) {
-
- switch (ioreq->req.operation) {
- case BLKIF_OP_READ:
- block_acct_invalid(blk_get_stats(blkdev->blk),
- BLOCK_ACCT_READ);
- break;
- case BLKIF_OP_WRITE:
- block_acct_invalid(blk_get_stats(blkdev->blk),
- BLOCK_ACCT_WRITE);
- break;
- case BLKIF_OP_FLUSH_DISKCACHE:
- block_acct_invalid(blk_get_stats(blkdev->blk),
- BLOCK_ACCT_FLUSH);
- default:
- break;
- };
-
- if (blk_send_response_one(ioreq)) {
- xen_pv_send_notify(&blkdev->xendev);
- }
- ioreq_release(ioreq, false);
- continue;
- }
-
- ioreq_runio_qemu_aio(ioreq);
- }
-
- if (blkdev->more_work && blkdev->requests_inflight < blkdev->max_requests) {
- qemu_bh_schedule(blkdev->bh);
- }
-}
-
-/* ------------------------------------------------------------- */
-
-static void blk_bh(void *opaque)
-{
- struct XenBlkDev *blkdev = opaque;
-
- aio_context_acquire(blkdev->ctx);
- blk_handle_requests(blkdev);
- aio_context_release(blkdev->ctx);
-}
-
-static void blk_alloc(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- Error *err = NULL;
-
- trace_xen_disk_alloc(xendev->name);
-
- QLIST_INIT(&blkdev->inflight);
- QLIST_INIT(&blkdev->finished);
- QLIST_INIT(&blkdev->freelist);
-
- blkdev->iothread = iothread_create(xendev->name, &err);
- assert(!err);
-
- blkdev->ctx = iothread_get_aio_context(blkdev->iothread);
- blkdev->bh = aio_bh_new(blkdev->ctx, blk_bh, blkdev);
-}
-
-static void blk_parse_discard(struct XenBlkDev *blkdev)
-{
- struct XenLegacyDevice *xendev = &blkdev->xendev;
- int enable;
-
- blkdev->feature_discard = true;
-
- if (xenstore_read_be_int(xendev, "discard-enable", &enable) == 0) {
- blkdev->feature_discard = !!enable;
- }
-
- if (blkdev->feature_discard) {
- xenstore_write_be_int(xendev, "feature-discard", 1);
- }
-}
-
-static int blk_init(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- int info = 0;
- char *directiosafe = NULL;
-
- trace_xen_disk_init(xendev->name);
-
- /* read xenstore entries */
- if (blkdev->params == NULL) {
- char *h = NULL;
- blkdev->params = xenstore_read_be_str(xendev, "params");
- if (blkdev->params != NULL) {
- h = strchr(blkdev->params, ':');
- }
- if (h != NULL) {
- blkdev->fileproto = blkdev->params;
- blkdev->filename = h+1;
- *h = 0;
- } else {
- blkdev->fileproto = "<unset>";
- blkdev->filename = blkdev->params;
- }
- }
- if (!strcmp("aio", blkdev->fileproto)) {
- blkdev->fileproto = "raw";
- }
- if (!strcmp("vhd", blkdev->fileproto)) {
- blkdev->fileproto = "vpc";
- }
- if (blkdev->mode == NULL) {
- blkdev->mode = xenstore_read_be_str(xendev, "mode");
- }
- if (blkdev->type == NULL) {
- blkdev->type = xenstore_read_be_str(xendev, "type");
- }
- if (blkdev->dev == NULL) {
- blkdev->dev = xenstore_read_be_str(xendev, "dev");
- }
- if (blkdev->devtype == NULL) {
- blkdev->devtype = xenstore_read_be_str(xendev, "device-type");
- }
- directiosafe = xenstore_read_be_str(xendev, "direct-io-safe");
- blkdev->directiosafe = (directiosafe && atoi(directiosafe));
-
- /* do we have all we need? */
- if (blkdev->params == NULL ||
- blkdev->mode == NULL ||
- blkdev->type == NULL ||
- blkdev->dev == NULL) {
- goto out_error;
- }
-
- /* read-only ? */
- if (strcmp(blkdev->mode, "w")) {
- info |= VDISK_READONLY;
- }
-
- /* cdrom ? */
- if (blkdev->devtype && !strcmp(blkdev->devtype, "cdrom")) {
- info |= VDISK_CDROM;
- }
-
- blkdev->file_blk = BLOCK_SIZE;
-
- /* fill info
- * blk_connect supplies sector-size and sectors
- */
- xenstore_write_be_int(xendev, "feature-flush-cache", 1);
- xenstore_write_be_int(xendev, "info", info);
-
- xenstore_write_be_int(xendev, "max-ring-page-order",
- MAX_RING_PAGE_ORDER);
-
- blk_parse_discard(blkdev);
-
- g_free(directiosafe);
- return 0;
-
-out_error:
- g_free(blkdev->params);
- blkdev->params = NULL;
- g_free(blkdev->mode);
- blkdev->mode = NULL;
- g_free(blkdev->type);
- blkdev->type = NULL;
- g_free(blkdev->dev);
- blkdev->dev = NULL;
- g_free(blkdev->devtype);
- blkdev->devtype = NULL;
- g_free(directiosafe);
- blkdev->directiosafe = false;
- return -1;
-}
-
-static int blk_connect(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- int index, qflags;
- bool readonly = true;
- bool writethrough = true;
- int order, ring_ref;
- unsigned int ring_size, max_grants;
- unsigned int i;
-
- trace_xen_disk_connect(xendev->name);
-
- /* read-only ? */
- if (blkdev->directiosafe) {
- qflags = BDRV_O_NOCACHE | BDRV_O_NATIVE_AIO;
- } else {
- qflags = 0;
- writethrough = false;
- }
- if (strcmp(blkdev->mode, "w") == 0) {
- qflags |= BDRV_O_RDWR;
- readonly = false;
- }
- if (blkdev->feature_discard) {
- qflags |= BDRV_O_UNMAP;
- }
-
- /* init qemu block driver */
- index = (xendev->dev - 202 * 256) / 16;
- blkdev->dinfo = drive_get(IF_XEN, 0, index);
- if (!blkdev->dinfo) {
- Error *local_err = NULL;
- QDict *options = NULL;
-
- if (strcmp(blkdev->fileproto, "<unset>")) {
- options = qdict_new();
- qdict_put_str(options, "driver", blkdev->fileproto);
- }
-
- /* setup via xenbus -> create new block driver instance */
- xen_pv_printf(xendev, 2, "create new bdrv (xenbus setup)\n");
- blkdev->blk = blk_new_open(blkdev->filename, NULL, options,
- qflags, &local_err);
- if (!blkdev->blk) {
- xen_pv_printf(xendev, 0, "error: %s\n",
- error_get_pretty(local_err));
- error_free(local_err);
- return -1;
- }
- blk_set_enable_write_cache(blkdev->blk, !writethrough);
- } else {
- /* setup via qemu cmdline -> already setup for us */
- xen_pv_printf(xendev, 2,
- "get configured bdrv (cmdline setup)\n");
- blkdev->blk = blk_by_legacy_dinfo(blkdev->dinfo);
- if (blk_is_read_only(blkdev->blk) && !readonly) {
- xen_pv_printf(xendev, 0, "Unexpected read-only drive");
- blkdev->blk = NULL;
- return -1;
- }
- /* blkdev->blk is not create by us, we get a reference
- * so we can blk_unref() unconditionally */
- blk_ref(blkdev->blk);
- }
- blk_attach_dev_legacy(blkdev->blk, blkdev);
- blkdev->file_size = blk_getlength(blkdev->blk);
- if (blkdev->file_size < 0) {
- BlockDriverState *bs = blk_bs(blkdev->blk);
- const char *drv_name = bs ? bdrv_get_format_name(bs) : NULL;
- xen_pv_printf(xendev, 1, "blk_getlength: %d (%s) | drv %s\n",
- (int)blkdev->file_size, strerror(-blkdev->file_size),
- drv_name ?: "-");
- blkdev->file_size = 0;
- }
-
- xen_pv_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\","
- " size %" PRId64 " (%" PRId64 " MB)\n",
- blkdev->type, blkdev->fileproto, blkdev->filename,
- blkdev->file_size, blkdev->file_size / MiB);
-
- /* Fill in number of sector size and number of sectors */
- xenstore_write_be_int(xendev, "sector-size", blkdev->file_blk);
- xenstore_write_be_int64(xendev, "sectors",
- blkdev->file_size / blkdev->file_blk);
-
- if (xenstore_read_fe_int(xendev, "ring-page-order",
- &order) == -1) {
- blkdev->nr_ring_ref = 1;
-
- if (xenstore_read_fe_int(xendev, "ring-ref",
- &ring_ref) == -1) {
- return -1;
- }
- blkdev->ring_ref[0] = ring_ref;
-
- } else if (order >= 0 && order <= MAX_RING_PAGE_ORDER) {
- blkdev->nr_ring_ref = 1 << order;
-
- for (i = 0; i < blkdev->nr_ring_ref; i++) {
- char *key;
-
- key = g_strdup_printf("ring-ref%u", i);
- if (!key) {
- return -1;
- }
-
- if (xenstore_read_fe_int(xendev, key,
- &ring_ref) == -1) {
- g_free(key);
- return -1;
- }
- blkdev->ring_ref[i] = ring_ref;
-
- g_free(key);
- }
- } else {
- xen_pv_printf(xendev, 0, "invalid ring-page-order: %d\n",
- order);
- return -1;
- }
-
- if (xenstore_read_fe_int(xendev, "event-channel",
- &xendev->remote_port) == -1) {
- return -1;
- }
-
- if (!xendev->protocol) {
- blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
- } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_NATIVE) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
- } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_X86_32;
- } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_X86_64;
- } else {
- blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
- }
-
- ring_size = XC_PAGE_SIZE * blkdev->nr_ring_ref;
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- {
- blkdev->max_requests = __CONST_RING_SIZE(blkif, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_32:
- {
- blkdev->max_requests = __CONST_RING_SIZE(blkif_x86_32, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_64:
- {
- blkdev->max_requests = __CONST_RING_SIZE(blkif_x86_64, ring_size);
- break;
- }
- default:
- return -1;
- }
-
- /* Add on the number needed for the ring pages */
- max_grants = blkdev->nr_ring_ref;
-
- xen_be_set_max_grant_refs(xendev, max_grants);
- blkdev->sring = xen_be_map_grant_refs(xendev, blkdev->ring_ref,
- blkdev->nr_ring_ref,
- PROT_READ | PROT_WRITE);
- if (!blkdev->sring) {
- return -1;
- }
-
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- {
- blkif_sring_t *sring_native = blkdev->sring;
- BACK_RING_INIT(&blkdev->rings.native, sring_native, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_32:
- {
- blkif_x86_32_sring_t *sring_x86_32 = blkdev->sring;
-
- BACK_RING_INIT(&blkdev->rings.x86_32_part, sring_x86_32, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_64:
- {
- blkif_x86_64_sring_t *sring_x86_64 = blkdev->sring;
-
- BACK_RING_INIT(&blkdev->rings.x86_64_part, sring_x86_64, ring_size);
- break;
- }
- }
-
- blk_set_aio_context(blkdev->blk, blkdev->ctx);
-
- xen_be_bind_evtchn(xendev);
-
- xen_pv_printf(xendev, 1, "ok: proto %s, nr-ring-ref %u, "
- "remote port %d, local port %d\n",
- xendev->protocol, blkdev->nr_ring_ref,
- xendev->remote_port, xendev->local_port);
- return 0;
-}
-
-static void blk_disconnect(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
-
- trace_xen_disk_disconnect(xendev->name);
-
- aio_context_acquire(blkdev->ctx);
-
- if (blkdev->blk) {
- blk_set_aio_context(blkdev->blk, qemu_get_aio_context());
- blk_detach_dev(blkdev->blk, blkdev);
- blk_unref(blkdev->blk);
- blkdev->blk = NULL;
- }
- xen_pv_unbind_evtchn(xendev);
-
- aio_context_release(blkdev->ctx);
-
- if (blkdev->sring) {
- xen_be_unmap_grant_refs(xendev, blkdev->sring,
- blkdev->nr_ring_ref);
- blkdev->sring = NULL;
- }
-}
-
-static int blk_free(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- struct ioreq *ioreq;
-
- trace_xen_disk_free(xendev->name);
-
- blk_disconnect(xendev);
-
- while (!QLIST_EMPTY(&blkdev->freelist)) {
- ioreq = QLIST_FIRST(&blkdev->freelist);
- QLIST_REMOVE(ioreq, list);
- qemu_iovec_destroy(&ioreq->v);
- g_free(ioreq);
- }
-
- g_free(blkdev->params);
- g_free(blkdev->mode);
- g_free(blkdev->type);
- g_free(blkdev->dev);
- g_free(blkdev->devtype);
- qemu_bh_delete(blkdev->bh);
- iothread_destroy(blkdev->iothread);
- return 0;
-}
-
-static void blk_event(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
-
- qemu_bh_schedule(blkdev->bh);
-}
-
-struct XenDevOps xen_blkdev_ops = {
- .flags = DEVOPS_FLAG_NEED_GNTDEV,
- .size = sizeof(struct XenBlkDev),
- .alloc = blk_alloc,
- .init = blk_init,
- .initialise = blk_connect,
- .disconnect = blk_disconnect,
- .event = blk_event,
- .free = blk_free,
-};