root / hw / block / xen_disk.c @ 454ae734
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/*
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* xen paravirt block device backend
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*
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* (c) Gerd Hoffmann <kraxel@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <signal.h> |
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#include <inttypes.h> |
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#include <time.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <sys/ioctl.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/mman.h> |
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#include <sys/uio.h> |
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|
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#include "hw/hw.h" |
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#include "hw/xen/xen_backend.h" |
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#include "xen_blkif.h" |
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#include "sysemu/blockdev.h" |
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|
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/* ------------------------------------------------------------- */
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static int batch_maps = 0; |
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|
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static int max_requests = 32; |
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/* ------------------------------------------------------------- */
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#define BLOCK_SIZE 512 |
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#define IOCB_COUNT (BLKIF_MAX_SEGMENTS_PER_REQUEST + 2) |
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|
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struct PersistentGrant {
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void *page;
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struct XenBlkDev *blkdev;
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}; |
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typedef struct PersistentGrant PersistentGrant; |
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|
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struct ioreq {
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blkif_request_t req; |
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int16_t status; |
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|
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/* parsed request */
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off_t start; |
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QEMUIOVector v; |
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int presync;
|
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int postsync;
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uint8_t mapped; |
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|
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/* grant mapping */
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uint32_t domids[BLKIF_MAX_SEGMENTS_PER_REQUEST]; |
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uint32_t refs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; |
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int prot;
|
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void *page[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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void *pages;
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int num_unmap;
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|
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/* aio status */
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int aio_inflight;
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int aio_errors;
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|
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struct XenBlkDev *blkdev;
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QLIST_ENTRY(ioreq) list; |
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BlockAcctCookie acct; |
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}; |
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|
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struct XenBlkDev {
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struct XenDevice xendev; /* must be first */ |
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char *params;
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char *mode;
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char *type;
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char *dev;
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char *devtype;
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bool directiosafe;
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const char *fileproto; |
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const char *filename; |
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int ring_ref;
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void *sring;
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int64_t file_blk; |
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int64_t file_size; |
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int protocol;
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blkif_back_rings_t rings; |
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int more_work;
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int cnt_map;
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|
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/* request lists */
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QLIST_HEAD(inflight_head, ioreq) inflight; |
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QLIST_HEAD(finished_head, ioreq) finished; |
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QLIST_HEAD(freelist_head, ioreq) freelist; |
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int requests_total;
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int requests_inflight;
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int requests_finished;
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|
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/* Persistent grants extension */
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gboolean feature_persistent; |
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GTree *persistent_gnts; |
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unsigned int persistent_gnt_count; |
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unsigned int max_grants; |
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|
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/* qemu block driver */
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DriveInfo *dinfo; |
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BlockDriverState *bs; |
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QEMUBH *bh; |
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}; |
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|
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/* ------------------------------------------------------------- */
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|
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static void ioreq_reset(struct ioreq *ioreq) |
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{
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memset(&ioreq->req, 0, sizeof(ioreq->req)); |
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ioreq->status = 0;
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ioreq->start = 0;
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ioreq->presync = 0;
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ioreq->postsync = 0;
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ioreq->mapped = 0;
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memset(ioreq->domids, 0, sizeof(ioreq->domids)); |
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memset(ioreq->refs, 0, sizeof(ioreq->refs)); |
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ioreq->prot = 0;
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memset(ioreq->page, 0, sizeof(ioreq->page)); |
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ioreq->pages = NULL;
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ioreq->aio_inflight = 0;
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ioreq->aio_errors = 0;
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ioreq->blkdev = NULL;
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memset(&ioreq->list, 0, sizeof(ioreq->list)); |
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memset(&ioreq->acct, 0, sizeof(ioreq->acct)); |
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qemu_iovec_reset(&ioreq->v); |
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} |
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static gint int_cmp(gconstpointer a, gconstpointer b, gpointer user_data)
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{
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uint ua = GPOINTER_TO_UINT(a); |
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uint ub = GPOINTER_TO_UINT(b); |
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return (ua > ub) - (ua < ub);
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} |
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|
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static void destroy_grant(gpointer pgnt) |
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{
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PersistentGrant *grant = pgnt; |
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XenGnttab gnt = grant->blkdev->xendev.gnttabdev; |
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|
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if (xc_gnttab_munmap(gnt, grant->page, 1) != 0) { |
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xen_be_printf(&grant->blkdev->xendev, 0,
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"xc_gnttab_munmap failed: %s\n",
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strerror(errno)); |
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} |
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grant->blkdev->persistent_gnt_count--; |
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xen_be_printf(&grant->blkdev->xendev, 3,
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"unmapped grant %p\n", grant->page);
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g_free(grant); |
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} |
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|
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static struct ioreq *ioreq_start(struct XenBlkDev *blkdev) |
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{
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struct ioreq *ioreq = NULL; |
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|
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if (QLIST_EMPTY(&blkdev->freelist)) {
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if (blkdev->requests_total >= max_requests) {
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goto out;
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} |
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/* allocate new struct */
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ioreq = g_malloc0(sizeof(*ioreq));
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ioreq->blkdev = blkdev; |
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blkdev->requests_total++; |
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qemu_iovec_init(&ioreq->v, BLKIF_MAX_SEGMENTS_PER_REQUEST); |
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} else {
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/* get one from freelist */
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ioreq = QLIST_FIRST(&blkdev->freelist); |
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QLIST_REMOVE(ioreq, list); |
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} |
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QLIST_INSERT_HEAD(&blkdev->inflight, ioreq, list); |
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blkdev->requests_inflight++; |
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out:
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return ioreq;
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} |
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static void ioreq_finish(struct ioreq *ioreq) |
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{
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struct XenBlkDev *blkdev = ioreq->blkdev;
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QLIST_REMOVE(ioreq, list); |
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QLIST_INSERT_HEAD(&blkdev->finished, ioreq, list); |
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blkdev->requests_inflight--; |
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blkdev->requests_finished++; |
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} |
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static void ioreq_release(struct ioreq *ioreq, bool finish) |
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{
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struct XenBlkDev *blkdev = ioreq->blkdev;
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|
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QLIST_REMOVE(ioreq, list); |
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ioreq_reset(ioreq); |
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ioreq->blkdev = blkdev; |
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QLIST_INSERT_HEAD(&blkdev->freelist, ioreq, list); |
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if (finish) {
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blkdev->requests_finished--; |
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} else {
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blkdev->requests_inflight--; |
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} |
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} |
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|
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/*
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* translate request into iovec + start offset
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* do sanity checks along the way
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*/
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static int ioreq_parse(struct ioreq *ioreq) |
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{
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struct XenBlkDev *blkdev = ioreq->blkdev;
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uintptr_t mem; |
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size_t len; |
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int i;
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xen_be_printf(&blkdev->xendev, 3,
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"op %d, nr %d, handle %d, id %" PRId64 ", sector %" PRId64 "\n", |
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ioreq->req.operation, ioreq->req.nr_segments, |
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ioreq->req.handle, ioreq->req.id, ioreq->req.sector_number); |
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switch (ioreq->req.operation) {
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case BLKIF_OP_READ:
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ioreq->prot = PROT_WRITE; /* to memory */
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break;
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case BLKIF_OP_FLUSH_DISKCACHE:
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ioreq->presync = 1;
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if (!ioreq->req.nr_segments) {
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return 0; |
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} |
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/* fall through */
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case BLKIF_OP_WRITE:
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ioreq->prot = PROT_READ; /* from memory */
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break;
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default:
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xen_be_printf(&blkdev->xendev, 0, "error: unknown operation (%d)\n", |
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ioreq->req.operation); |
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goto err;
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}; |
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|
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if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') { |
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xen_be_printf(&blkdev->xendev, 0, "error: write req for ro device\n"); |
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goto err;
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} |
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|
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ioreq->start = ioreq->req.sector_number * blkdev->file_blk; |
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for (i = 0; i < ioreq->req.nr_segments; i++) { |
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if (i == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
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xen_be_printf(&blkdev->xendev, 0, "error: nr_segments too big\n"); |
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goto err;
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} |
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if (ioreq->req.seg[i].first_sect > ioreq->req.seg[i].last_sect) {
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xen_be_printf(&blkdev->xendev, 0, "error: first > last sector\n"); |
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goto err;
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} |
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if (ioreq->req.seg[i].last_sect * BLOCK_SIZE >= XC_PAGE_SIZE) {
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xen_be_printf(&blkdev->xendev, 0, "error: page crossing\n"); |
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goto err;
|
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} |
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ioreq->domids[i] = blkdev->xendev.dom; |
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ioreq->refs[i] = ioreq->req.seg[i].gref; |
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|
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mem = ioreq->req.seg[i].first_sect * blkdev->file_blk; |
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len = (ioreq->req.seg[i].last_sect - ioreq->req.seg[i].first_sect + 1) * blkdev->file_blk;
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qemu_iovec_add(&ioreq->v, (void*)mem, len);
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} |
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if (ioreq->start + ioreq->v.size > blkdev->file_size) {
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xen_be_printf(&blkdev->xendev, 0, "error: access beyond end of file\n"); |
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goto err;
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} |
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return 0; |
| 294 |
|
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err:
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ioreq->status = BLKIF_RSP_ERROR; |
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return -1; |
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} |
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|
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static void ioreq_unmap(struct ioreq *ioreq) |
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{
|
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XenGnttab gnt = ioreq->blkdev->xendev.gnttabdev; |
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int i;
|
| 304 |
|
| 305 |
if (ioreq->num_unmap == 0 || ioreq->mapped == 0) { |
| 306 |
return;
|
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} |
| 308 |
if (batch_maps) {
|
| 309 |
if (!ioreq->pages) {
|
| 310 |
return;
|
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} |
| 312 |
if (xc_gnttab_munmap(gnt, ioreq->pages, ioreq->num_unmap) != 0) { |
| 313 |
xen_be_printf(&ioreq->blkdev->xendev, 0, "xc_gnttab_munmap failed: %s\n", |
| 314 |
strerror(errno)); |
| 315 |
} |
| 316 |
ioreq->blkdev->cnt_map -= ioreq->num_unmap; |
| 317 |
ioreq->pages = NULL;
|
| 318 |
} else {
|
| 319 |
for (i = 0; i < ioreq->num_unmap; i++) { |
| 320 |
if (!ioreq->page[i]) {
|
| 321 |
continue;
|
| 322 |
} |
| 323 |
if (xc_gnttab_munmap(gnt, ioreq->page[i], 1) != 0) { |
| 324 |
xen_be_printf(&ioreq->blkdev->xendev, 0, "xc_gnttab_munmap failed: %s\n", |
| 325 |
strerror(errno)); |
| 326 |
} |
| 327 |
ioreq->blkdev->cnt_map--; |
| 328 |
ioreq->page[i] = NULL;
|
| 329 |
} |
| 330 |
} |
| 331 |
ioreq->mapped = 0;
|
| 332 |
} |
| 333 |
|
| 334 |
static int ioreq_map(struct ioreq *ioreq) |
| 335 |
{
|
| 336 |
XenGnttab gnt = ioreq->blkdev->xendev.gnttabdev; |
| 337 |
uint32_t domids[BLKIF_MAX_SEGMENTS_PER_REQUEST]; |
| 338 |
uint32_t refs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; |
| 339 |
void *page[BLKIF_MAX_SEGMENTS_PER_REQUEST];
|
| 340 |
int i, j, new_maps = 0; |
| 341 |
PersistentGrant *grant; |
| 342 |
/* domids and refs variables will contain the information necessary
|
| 343 |
* to map the grants that are needed to fulfill this request.
|
| 344 |
*
|
| 345 |
* After mapping the needed grants, the page array will contain the
|
| 346 |
* memory address of each granted page in the order specified in ioreq
|
| 347 |
* (disregarding if it's a persistent grant or not).
|
| 348 |
*/
|
| 349 |
|
| 350 |
if (ioreq->v.niov == 0 || ioreq->mapped == 1) { |
| 351 |
return 0; |
| 352 |
} |
| 353 |
if (ioreq->blkdev->feature_persistent) {
|
| 354 |
for (i = 0; i < ioreq->v.niov; i++) { |
| 355 |
grant = g_tree_lookup(ioreq->blkdev->persistent_gnts, |
| 356 |
GUINT_TO_POINTER(ioreq->refs[i])); |
| 357 |
|
| 358 |
if (grant != NULL) { |
| 359 |
page[i] = grant->page; |
| 360 |
xen_be_printf(&ioreq->blkdev->xendev, 3,
|
| 361 |
"using persistent-grant %" PRIu32 "\n", |
| 362 |
ioreq->refs[i]); |
| 363 |
} else {
|
| 364 |
/* Add the grant to the list of grants that
|
| 365 |
* should be mapped
|
| 366 |
*/
|
| 367 |
domids[new_maps] = ioreq->domids[i]; |
| 368 |
refs[new_maps] = ioreq->refs[i]; |
| 369 |
page[i] = NULL;
|
| 370 |
new_maps++; |
| 371 |
} |
| 372 |
} |
| 373 |
/* Set the protection to RW, since grants may be reused later
|
| 374 |
* with a different protection than the one needed for this request
|
| 375 |
*/
|
| 376 |
ioreq->prot = PROT_WRITE | PROT_READ; |
| 377 |
} else {
|
| 378 |
/* All grants in the request should be mapped */
|
| 379 |
memcpy(refs, ioreq->refs, sizeof(refs));
|
| 380 |
memcpy(domids, ioreq->domids, sizeof(domids));
|
| 381 |
memset(page, 0, sizeof(page)); |
| 382 |
new_maps = ioreq->v.niov; |
| 383 |
} |
| 384 |
|
| 385 |
if (batch_maps && new_maps) {
|
| 386 |
ioreq->pages = xc_gnttab_map_grant_refs |
| 387 |
(gnt, new_maps, domids, refs, ioreq->prot); |
| 388 |
if (ioreq->pages == NULL) { |
| 389 |
xen_be_printf(&ioreq->blkdev->xendev, 0,
|
| 390 |
"can't map %d grant refs (%s, %d maps)\n",
|
| 391 |
new_maps, strerror(errno), ioreq->blkdev->cnt_map); |
| 392 |
return -1; |
| 393 |
} |
| 394 |
for (i = 0, j = 0; i < ioreq->v.niov; i++) { |
| 395 |
if (page[i] == NULL) { |
| 396 |
page[i] = ioreq->pages + (j++) * XC_PAGE_SIZE; |
| 397 |
} |
| 398 |
} |
| 399 |
ioreq->blkdev->cnt_map += new_maps; |
| 400 |
} else if (new_maps) { |
| 401 |
for (i = 0; i < new_maps; i++) { |
| 402 |
ioreq->page[i] = xc_gnttab_map_grant_ref |
| 403 |
(gnt, domids[i], refs[i], ioreq->prot); |
| 404 |
if (ioreq->page[i] == NULL) { |
| 405 |
xen_be_printf(&ioreq->blkdev->xendev, 0,
|
| 406 |
"can't map grant ref %d (%s, %d maps)\n",
|
| 407 |
refs[i], strerror(errno), ioreq->blkdev->cnt_map); |
| 408 |
ioreq_unmap(ioreq); |
| 409 |
return -1; |
| 410 |
} |
| 411 |
ioreq->blkdev->cnt_map++; |
| 412 |
} |
| 413 |
for (i = 0, j = 0; i < ioreq->v.niov; i++) { |
| 414 |
if (page[i] == NULL) { |
| 415 |
page[i] = ioreq->page[j++]; |
| 416 |
} |
| 417 |
} |
| 418 |
} |
| 419 |
if (ioreq->blkdev->feature_persistent) {
|
| 420 |
while ((ioreq->blkdev->persistent_gnt_count < ioreq->blkdev->max_grants)
|
| 421 |
&& new_maps) {
|
| 422 |
/* Go through the list of newly mapped grants and add as many
|
| 423 |
* as possible to the list of persistently mapped grants.
|
| 424 |
*
|
| 425 |
* Since we start at the end of ioreq->page(s), we only need
|
| 426 |
* to decrease new_maps to prevent this granted pages from
|
| 427 |
* being unmapped in ioreq_unmap.
|
| 428 |
*/
|
| 429 |
grant = g_malloc0(sizeof(*grant));
|
| 430 |
new_maps--; |
| 431 |
if (batch_maps) {
|
| 432 |
grant->page = ioreq->pages + (new_maps) * XC_PAGE_SIZE; |
| 433 |
} else {
|
| 434 |
grant->page = ioreq->page[new_maps]; |
| 435 |
} |
| 436 |
grant->blkdev = ioreq->blkdev; |
| 437 |
xen_be_printf(&ioreq->blkdev->xendev, 3,
|
| 438 |
"adding grant %" PRIu32 " page: %p\n", |
| 439 |
refs[new_maps], grant->page); |
| 440 |
g_tree_insert(ioreq->blkdev->persistent_gnts, |
| 441 |
GUINT_TO_POINTER(refs[new_maps]), |
| 442 |
grant); |
| 443 |
ioreq->blkdev->persistent_gnt_count++; |
| 444 |
} |
| 445 |
} |
| 446 |
for (i = 0; i < ioreq->v.niov; i++) { |
| 447 |
ioreq->v.iov[i].iov_base += (uintptr_t)page[i]; |
| 448 |
} |
| 449 |
ioreq->mapped = 1;
|
| 450 |
ioreq->num_unmap = new_maps; |
| 451 |
return 0; |
| 452 |
} |
| 453 |
|
| 454 |
static int ioreq_runio_qemu_aio(struct ioreq *ioreq); |
| 455 |
|
| 456 |
static void qemu_aio_complete(void *opaque, int ret) |
| 457 |
{
|
| 458 |
struct ioreq *ioreq = opaque;
|
| 459 |
|
| 460 |
if (ret != 0) { |
| 461 |
xen_be_printf(&ioreq->blkdev->xendev, 0, "%s I/O error\n", |
| 462 |
ioreq->req.operation == BLKIF_OP_READ ? "read" : "write"); |
| 463 |
ioreq->aio_errors++; |
| 464 |
} |
| 465 |
|
| 466 |
ioreq->aio_inflight--; |
| 467 |
if (ioreq->presync) {
|
| 468 |
ioreq->presync = 0;
|
| 469 |
ioreq_runio_qemu_aio(ioreq); |
| 470 |
return;
|
| 471 |
} |
| 472 |
if (ioreq->aio_inflight > 0) { |
| 473 |
return;
|
| 474 |
} |
| 475 |
if (ioreq->postsync) {
|
| 476 |
ioreq->postsync = 0;
|
| 477 |
ioreq->aio_inflight++; |
| 478 |
bdrv_aio_flush(ioreq->blkdev->bs, qemu_aio_complete, ioreq); |
| 479 |
return;
|
| 480 |
} |
| 481 |
|
| 482 |
ioreq->status = ioreq->aio_errors ? BLKIF_RSP_ERROR : BLKIF_RSP_OKAY; |
| 483 |
ioreq_unmap(ioreq); |
| 484 |
ioreq_finish(ioreq); |
| 485 |
bdrv_acct_done(ioreq->blkdev->bs, &ioreq->acct); |
| 486 |
qemu_bh_schedule(ioreq->blkdev->bh); |
| 487 |
} |
| 488 |
|
| 489 |
static int ioreq_runio_qemu_aio(struct ioreq *ioreq) |
| 490 |
{
|
| 491 |
struct XenBlkDev *blkdev = ioreq->blkdev;
|
| 492 |
|
| 493 |
if (ioreq->req.nr_segments && ioreq_map(ioreq) == -1) { |
| 494 |
goto err_no_map;
|
| 495 |
} |
| 496 |
|
| 497 |
ioreq->aio_inflight++; |
| 498 |
if (ioreq->presync) {
|
| 499 |
bdrv_aio_flush(ioreq->blkdev->bs, qemu_aio_complete, ioreq); |
| 500 |
return 0; |
| 501 |
} |
| 502 |
|
| 503 |
switch (ioreq->req.operation) {
|
| 504 |
case BLKIF_OP_READ:
|
| 505 |
bdrv_acct_start(blkdev->bs, &ioreq->acct, ioreq->v.size, BDRV_ACCT_READ); |
| 506 |
ioreq->aio_inflight++; |
| 507 |
bdrv_aio_readv(blkdev->bs, ioreq->start / BLOCK_SIZE, |
| 508 |
&ioreq->v, ioreq->v.size / BLOCK_SIZE, |
| 509 |
qemu_aio_complete, ioreq); |
| 510 |
break;
|
| 511 |
case BLKIF_OP_WRITE:
|
| 512 |
case BLKIF_OP_FLUSH_DISKCACHE:
|
| 513 |
if (!ioreq->req.nr_segments) {
|
| 514 |
break;
|
| 515 |
} |
| 516 |
|
| 517 |
bdrv_acct_start(blkdev->bs, &ioreq->acct, ioreq->v.size, BDRV_ACCT_WRITE); |
| 518 |
ioreq->aio_inflight++; |
| 519 |
bdrv_aio_writev(blkdev->bs, ioreq->start / BLOCK_SIZE, |
| 520 |
&ioreq->v, ioreq->v.size / BLOCK_SIZE, |
| 521 |
qemu_aio_complete, ioreq); |
| 522 |
break;
|
| 523 |
default:
|
| 524 |
/* unknown operation (shouldn't happen -- parse catches this) */
|
| 525 |
goto err;
|
| 526 |
} |
| 527 |
|
| 528 |
qemu_aio_complete(ioreq, 0);
|
| 529 |
|
| 530 |
return 0; |
| 531 |
|
| 532 |
err:
|
| 533 |
ioreq_unmap(ioreq); |
| 534 |
err_no_map:
|
| 535 |
ioreq_finish(ioreq); |
| 536 |
ioreq->status = BLKIF_RSP_ERROR; |
| 537 |
return -1; |
| 538 |
} |
| 539 |
|
| 540 |
static int blk_send_response_one(struct ioreq *ioreq) |
| 541 |
{
|
| 542 |
struct XenBlkDev *blkdev = ioreq->blkdev;
|
| 543 |
int send_notify = 0; |
| 544 |
int have_requests = 0; |
| 545 |
blkif_response_t resp; |
| 546 |
void *dst;
|
| 547 |
|
| 548 |
resp.id = ioreq->req.id; |
| 549 |
resp.operation = ioreq->req.operation; |
| 550 |
resp.status = ioreq->status; |
| 551 |
|
| 552 |
/* Place on the response ring for the relevant domain. */
|
| 553 |
switch (blkdev->protocol) {
|
| 554 |
case BLKIF_PROTOCOL_NATIVE:
|
| 555 |
dst = RING_GET_RESPONSE(&blkdev->rings.native, blkdev->rings.native.rsp_prod_pvt); |
| 556 |
break;
|
| 557 |
case BLKIF_PROTOCOL_X86_32:
|
| 558 |
dst = RING_GET_RESPONSE(&blkdev->rings.x86_32_part, |
| 559 |
blkdev->rings.x86_32_part.rsp_prod_pvt); |
| 560 |
break;
|
| 561 |
case BLKIF_PROTOCOL_X86_64:
|
| 562 |
dst = RING_GET_RESPONSE(&blkdev->rings.x86_64_part, |
| 563 |
blkdev->rings.x86_64_part.rsp_prod_pvt); |
| 564 |
break;
|
| 565 |
default:
|
| 566 |
dst = NULL;
|
| 567 |
} |
| 568 |
memcpy(dst, &resp, sizeof(resp));
|
| 569 |
blkdev->rings.common.rsp_prod_pvt++; |
| 570 |
|
| 571 |
RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blkdev->rings.common, send_notify); |
| 572 |
if (blkdev->rings.common.rsp_prod_pvt == blkdev->rings.common.req_cons) {
|
| 573 |
/*
|
| 574 |
* Tail check for pending requests. Allows frontend to avoid
|
| 575 |
* notifications if requests are already in flight (lower
|
| 576 |
* overheads and promotes batching).
|
| 577 |
*/
|
| 578 |
RING_FINAL_CHECK_FOR_REQUESTS(&blkdev->rings.common, have_requests); |
| 579 |
} else if (RING_HAS_UNCONSUMED_REQUESTS(&blkdev->rings.common)) { |
| 580 |
have_requests = 1;
|
| 581 |
} |
| 582 |
|
| 583 |
if (have_requests) {
|
| 584 |
blkdev->more_work++; |
| 585 |
} |
| 586 |
return send_notify;
|
| 587 |
} |
| 588 |
|
| 589 |
/* walk finished list, send outstanding responses, free requests */
|
| 590 |
static void blk_send_response_all(struct XenBlkDev *blkdev) |
| 591 |
{
|
| 592 |
struct ioreq *ioreq;
|
| 593 |
int send_notify = 0; |
| 594 |
|
| 595 |
while (!QLIST_EMPTY(&blkdev->finished)) {
|
| 596 |
ioreq = QLIST_FIRST(&blkdev->finished); |
| 597 |
send_notify += blk_send_response_one(ioreq); |
| 598 |
ioreq_release(ioreq, true);
|
| 599 |
} |
| 600 |
if (send_notify) {
|
| 601 |
xen_be_send_notify(&blkdev->xendev); |
| 602 |
} |
| 603 |
} |
| 604 |
|
| 605 |
static int blk_get_request(struct XenBlkDev *blkdev, struct ioreq *ioreq, RING_IDX rc) |
| 606 |
{
|
| 607 |
switch (blkdev->protocol) {
|
| 608 |
case BLKIF_PROTOCOL_NATIVE:
|
| 609 |
memcpy(&ioreq->req, RING_GET_REQUEST(&blkdev->rings.native, rc), |
| 610 |
sizeof(ioreq->req));
|
| 611 |
break;
|
| 612 |
case BLKIF_PROTOCOL_X86_32:
|
| 613 |
blkif_get_x86_32_req(&ioreq->req, |
| 614 |
RING_GET_REQUEST(&blkdev->rings.x86_32_part, rc)); |
| 615 |
break;
|
| 616 |
case BLKIF_PROTOCOL_X86_64:
|
| 617 |
blkif_get_x86_64_req(&ioreq->req, |
| 618 |
RING_GET_REQUEST(&blkdev->rings.x86_64_part, rc)); |
| 619 |
break;
|
| 620 |
} |
| 621 |
return 0; |
| 622 |
} |
| 623 |
|
| 624 |
static void blk_handle_requests(struct XenBlkDev *blkdev) |
| 625 |
{
|
| 626 |
RING_IDX rc, rp; |
| 627 |
struct ioreq *ioreq;
|
| 628 |
|
| 629 |
blkdev->more_work = 0;
|
| 630 |
|
| 631 |
rc = blkdev->rings.common.req_cons; |
| 632 |
rp = blkdev->rings.common.sring->req_prod; |
| 633 |
xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
|
| 634 |
|
| 635 |
blk_send_response_all(blkdev); |
| 636 |
while (rc != rp) {
|
| 637 |
/* pull request from ring */
|
| 638 |
if (RING_REQUEST_CONS_OVERFLOW(&blkdev->rings.common, rc)) {
|
| 639 |
break;
|
| 640 |
} |
| 641 |
ioreq = ioreq_start(blkdev); |
| 642 |
if (ioreq == NULL) { |
| 643 |
blkdev->more_work++; |
| 644 |
break;
|
| 645 |
} |
| 646 |
blk_get_request(blkdev, ioreq, rc); |
| 647 |
blkdev->rings.common.req_cons = ++rc; |
| 648 |
|
| 649 |
/* parse them */
|
| 650 |
if (ioreq_parse(ioreq) != 0) { |
| 651 |
if (blk_send_response_one(ioreq)) {
|
| 652 |
xen_be_send_notify(&blkdev->xendev); |
| 653 |
} |
| 654 |
ioreq_release(ioreq, false);
|
| 655 |
continue;
|
| 656 |
} |
| 657 |
|
| 658 |
ioreq_runio_qemu_aio(ioreq); |
| 659 |
} |
| 660 |
|
| 661 |
if (blkdev->more_work && blkdev->requests_inflight < max_requests) {
|
| 662 |
qemu_bh_schedule(blkdev->bh); |
| 663 |
} |
| 664 |
} |
| 665 |
|
| 666 |
/* ------------------------------------------------------------- */
|
| 667 |
|
| 668 |
static void blk_bh(void *opaque) |
| 669 |
{
|
| 670 |
struct XenBlkDev *blkdev = opaque;
|
| 671 |
blk_handle_requests(blkdev); |
| 672 |
} |
| 673 |
|
| 674 |
/*
|
| 675 |
* We need to account for the grant allocations requiring contiguous
|
| 676 |
* chunks; the worst case number would be
|
| 677 |
* max_req * max_seg + (max_req - 1) * (max_seg - 1) + 1,
|
| 678 |
* but in order to keep things simple just use
|
| 679 |
* 2 * max_req * max_seg.
|
| 680 |
*/
|
| 681 |
#define MAX_GRANTS(max_req, max_seg) (2 * (max_req) * (max_seg)) |
| 682 |
|
| 683 |
static void blk_alloc(struct XenDevice *xendev) |
| 684 |
{
|
| 685 |
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); |
| 686 |
|
| 687 |
QLIST_INIT(&blkdev->inflight); |
| 688 |
QLIST_INIT(&blkdev->finished); |
| 689 |
QLIST_INIT(&blkdev->freelist); |
| 690 |
blkdev->bh = qemu_bh_new(blk_bh, blkdev); |
| 691 |
if (xen_mode != XEN_EMULATE) {
|
| 692 |
batch_maps = 1;
|
| 693 |
} |
| 694 |
if (xc_gnttab_set_max_grants(xendev->gnttabdev,
|
| 695 |
MAX_GRANTS(max_requests, BLKIF_MAX_SEGMENTS_PER_REQUEST)) < 0) {
|
| 696 |
xen_be_printf(xendev, 0, "xc_gnttab_set_max_grants failed: %s\n", |
| 697 |
strerror(errno)); |
| 698 |
} |
| 699 |
} |
| 700 |
|
| 701 |
static int blk_init(struct XenDevice *xendev) |
| 702 |
{
|
| 703 |
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); |
| 704 |
int info = 0; |
| 705 |
char *directiosafe = NULL; |
| 706 |
|
| 707 |
/* read xenstore entries */
|
| 708 |
if (blkdev->params == NULL) { |
| 709 |
char *h = NULL; |
| 710 |
blkdev->params = xenstore_read_be_str(&blkdev->xendev, "params");
|
| 711 |
if (blkdev->params != NULL) { |
| 712 |
h = strchr(blkdev->params, ':');
|
| 713 |
} |
| 714 |
if (h != NULL) { |
| 715 |
blkdev->fileproto = blkdev->params; |
| 716 |
blkdev->filename = h+1;
|
| 717 |
*h = 0;
|
| 718 |
} else {
|
| 719 |
blkdev->fileproto = "<unset>";
|
| 720 |
blkdev->filename = blkdev->params; |
| 721 |
} |
| 722 |
} |
| 723 |
if (!strcmp("aio", blkdev->fileproto)) { |
| 724 |
blkdev->fileproto = "raw";
|
| 725 |
} |
| 726 |
if (blkdev->mode == NULL) { |
| 727 |
blkdev->mode = xenstore_read_be_str(&blkdev->xendev, "mode");
|
| 728 |
} |
| 729 |
if (blkdev->type == NULL) { |
| 730 |
blkdev->type = xenstore_read_be_str(&blkdev->xendev, "type");
|
| 731 |
} |
| 732 |
if (blkdev->dev == NULL) { |
| 733 |
blkdev->dev = xenstore_read_be_str(&blkdev->xendev, "dev");
|
| 734 |
} |
| 735 |
if (blkdev->devtype == NULL) { |
| 736 |
blkdev->devtype = xenstore_read_be_str(&blkdev->xendev, "device-type");
|
| 737 |
} |
| 738 |
directiosafe = xenstore_read_be_str(&blkdev->xendev, "direct-io-safe");
|
| 739 |
blkdev->directiosafe = (directiosafe && atoi(directiosafe)); |
| 740 |
|
| 741 |
/* do we have all we need? */
|
| 742 |
if (blkdev->params == NULL || |
| 743 |
blkdev->mode == NULL ||
|
| 744 |
blkdev->type == NULL ||
|
| 745 |
blkdev->dev == NULL) {
|
| 746 |
goto out_error;
|
| 747 |
} |
| 748 |
|
| 749 |
/* read-only ? */
|
| 750 |
if (strcmp(blkdev->mode, "w")) { |
| 751 |
info |= VDISK_READONLY; |
| 752 |
} |
| 753 |
|
| 754 |
/* cdrom ? */
|
| 755 |
if (blkdev->devtype && !strcmp(blkdev->devtype, "cdrom")) { |
| 756 |
info |= VDISK_CDROM; |
| 757 |
} |
| 758 |
|
| 759 |
blkdev->file_blk = BLOCK_SIZE; |
| 760 |
|
| 761 |
/* fill info
|
| 762 |
* blk_connect supplies sector-size and sectors
|
| 763 |
*/
|
| 764 |
xenstore_write_be_int(&blkdev->xendev, "feature-flush-cache", 1); |
| 765 |
xenstore_write_be_int(&blkdev->xendev, "feature-persistent", 1); |
| 766 |
xenstore_write_be_int(&blkdev->xendev, "info", info);
|
| 767 |
|
| 768 |
g_free(directiosafe); |
| 769 |
return 0; |
| 770 |
|
| 771 |
out_error:
|
| 772 |
g_free(blkdev->params); |
| 773 |
blkdev->params = NULL;
|
| 774 |
g_free(blkdev->mode); |
| 775 |
blkdev->mode = NULL;
|
| 776 |
g_free(blkdev->type); |
| 777 |
blkdev->type = NULL;
|
| 778 |
g_free(blkdev->dev); |
| 779 |
blkdev->dev = NULL;
|
| 780 |
g_free(blkdev->devtype); |
| 781 |
blkdev->devtype = NULL;
|
| 782 |
g_free(directiosafe); |
| 783 |
blkdev->directiosafe = false;
|
| 784 |
return -1; |
| 785 |
} |
| 786 |
|
| 787 |
static int blk_connect(struct XenDevice *xendev) |
| 788 |
{
|
| 789 |
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); |
| 790 |
int pers, index, qflags;
|
| 791 |
bool readonly = true; |
| 792 |
|
| 793 |
/* read-only ? */
|
| 794 |
if (blkdev->directiosafe) {
|
| 795 |
qflags = BDRV_O_NOCACHE | BDRV_O_NATIVE_AIO; |
| 796 |
} else {
|
| 797 |
qflags = BDRV_O_CACHE_WB; |
| 798 |
} |
| 799 |
if (strcmp(blkdev->mode, "w") == 0) { |
| 800 |
qflags |= BDRV_O_RDWR; |
| 801 |
readonly = false;
|
| 802 |
} |
| 803 |
|
| 804 |
/* init qemu block driver */
|
| 805 |
index = (blkdev->xendev.dev - 202 * 256) / 16; |
| 806 |
blkdev->dinfo = drive_get(IF_XEN, 0, index);
|
| 807 |
if (!blkdev->dinfo) {
|
| 808 |
/* setup via xenbus -> create new block driver instance */
|
| 809 |
xen_be_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n"); |
| 810 |
blkdev->bs = bdrv_new(blkdev->dev); |
| 811 |
if (blkdev->bs) {
|
| 812 |
BlockDriver *drv = bdrv_find_whitelisted_format(blkdev->fileproto, |
| 813 |
readonly); |
| 814 |
if (bdrv_open(blkdev->bs,
|
| 815 |
blkdev->filename, NULL, qflags, drv) != 0) { |
| 816 |
bdrv_delete(blkdev->bs); |
| 817 |
blkdev->bs = NULL;
|
| 818 |
} |
| 819 |
} |
| 820 |
if (!blkdev->bs) {
|
| 821 |
return -1; |
| 822 |
} |
| 823 |
} else {
|
| 824 |
/* setup via qemu cmdline -> already setup for us */
|
| 825 |
xen_be_printf(&blkdev->xendev, 2, "get configured bdrv (cmdline setup)\n"); |
| 826 |
blkdev->bs = blkdev->dinfo->bdrv; |
| 827 |
} |
| 828 |
bdrv_attach_dev_nofail(blkdev->bs, blkdev); |
| 829 |
blkdev->file_size = bdrv_getlength(blkdev->bs); |
| 830 |
if (blkdev->file_size < 0) { |
| 831 |
xen_be_printf(&blkdev->xendev, 1, "bdrv_getlength: %d (%s) | drv %s\n", |
| 832 |
(int)blkdev->file_size, strerror(-blkdev->file_size),
|
| 833 |
bdrv_get_format_name(blkdev->bs) ?: "-");
|
| 834 |
blkdev->file_size = 0;
|
| 835 |
} |
| 836 |
|
| 837 |
xen_be_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\"," |
| 838 |
" size %" PRId64 " (%" PRId64 " MB)\n", |
| 839 |
blkdev->type, blkdev->fileproto, blkdev->filename, |
| 840 |
blkdev->file_size, blkdev->file_size >> 20);
|
| 841 |
|
| 842 |
/* Fill in number of sector size and number of sectors */
|
| 843 |
xenstore_write_be_int(&blkdev->xendev, "sector-size", blkdev->file_blk);
|
| 844 |
xenstore_write_be_int64(&blkdev->xendev, "sectors",
|
| 845 |
blkdev->file_size / blkdev->file_blk); |
| 846 |
|
| 847 |
if (xenstore_read_fe_int(&blkdev->xendev, "ring-ref", &blkdev->ring_ref) == -1) { |
| 848 |
return -1; |
| 849 |
} |
| 850 |
if (xenstore_read_fe_int(&blkdev->xendev, "event-channel", |
| 851 |
&blkdev->xendev.remote_port) == -1) {
|
| 852 |
return -1; |
| 853 |
} |
| 854 |
if (xenstore_read_fe_int(&blkdev->xendev, "feature-persistent", &pers)) { |
| 855 |
blkdev->feature_persistent = FALSE; |
| 856 |
} else {
|
| 857 |
blkdev->feature_persistent = !!pers; |
| 858 |
} |
| 859 |
|
| 860 |
blkdev->protocol = BLKIF_PROTOCOL_NATIVE; |
| 861 |
if (blkdev->xendev.protocol) {
|
| 862 |
if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_32) == 0) { |
| 863 |
blkdev->protocol = BLKIF_PROTOCOL_X86_32; |
| 864 |
} |
| 865 |
if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_64) == 0) { |
| 866 |
blkdev->protocol = BLKIF_PROTOCOL_X86_64; |
| 867 |
} |
| 868 |
} |
| 869 |
|
| 870 |
blkdev->sring = xc_gnttab_map_grant_ref(blkdev->xendev.gnttabdev, |
| 871 |
blkdev->xendev.dom, |
| 872 |
blkdev->ring_ref, |
| 873 |
PROT_READ | PROT_WRITE); |
| 874 |
if (!blkdev->sring) {
|
| 875 |
return -1; |
| 876 |
} |
| 877 |
blkdev->cnt_map++; |
| 878 |
|
| 879 |
switch (blkdev->protocol) {
|
| 880 |
case BLKIF_PROTOCOL_NATIVE:
|
| 881 |
{
|
| 882 |
blkif_sring_t *sring_native = blkdev->sring; |
| 883 |
BACK_RING_INIT(&blkdev->rings.native, sring_native, XC_PAGE_SIZE); |
| 884 |
break;
|
| 885 |
} |
| 886 |
case BLKIF_PROTOCOL_X86_32:
|
| 887 |
{
|
| 888 |
blkif_x86_32_sring_t *sring_x86_32 = blkdev->sring; |
| 889 |
|
| 890 |
BACK_RING_INIT(&blkdev->rings.x86_32_part, sring_x86_32, XC_PAGE_SIZE); |
| 891 |
break;
|
| 892 |
} |
| 893 |
case BLKIF_PROTOCOL_X86_64:
|
| 894 |
{
|
| 895 |
blkif_x86_64_sring_t *sring_x86_64 = blkdev->sring; |
| 896 |
|
| 897 |
BACK_RING_INIT(&blkdev->rings.x86_64_part, sring_x86_64, XC_PAGE_SIZE); |
| 898 |
break;
|
| 899 |
} |
| 900 |
} |
| 901 |
|
| 902 |
if (blkdev->feature_persistent) {
|
| 903 |
/* Init persistent grants */
|
| 904 |
blkdev->max_grants = max_requests * BLKIF_MAX_SEGMENTS_PER_REQUEST; |
| 905 |
blkdev->persistent_gnts = g_tree_new_full((GCompareDataFunc)int_cmp, |
| 906 |
NULL, NULL, |
| 907 |
(GDestroyNotify)destroy_grant); |
| 908 |
blkdev->persistent_gnt_count = 0;
|
| 909 |
} |
| 910 |
|
| 911 |
xen_be_bind_evtchn(&blkdev->xendev); |
| 912 |
|
| 913 |
xen_be_printf(&blkdev->xendev, 1, "ok: proto %s, ring-ref %d, " |
| 914 |
"remote port %d, local port %d\n",
|
| 915 |
blkdev->xendev.protocol, blkdev->ring_ref, |
| 916 |
blkdev->xendev.remote_port, blkdev->xendev.local_port); |
| 917 |
return 0; |
| 918 |
} |
| 919 |
|
| 920 |
static void blk_disconnect(struct XenDevice *xendev) |
| 921 |
{
|
| 922 |
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); |
| 923 |
|
| 924 |
if (blkdev->bs) {
|
| 925 |
if (!blkdev->dinfo) {
|
| 926 |
/* close/delete only if we created it ourself */
|
| 927 |
bdrv_close(blkdev->bs); |
| 928 |
bdrv_detach_dev(blkdev->bs, blkdev); |
| 929 |
bdrv_delete(blkdev->bs); |
| 930 |
} |
| 931 |
blkdev->bs = NULL;
|
| 932 |
} |
| 933 |
xen_be_unbind_evtchn(&blkdev->xendev); |
| 934 |
|
| 935 |
if (blkdev->sring) {
|
| 936 |
xc_gnttab_munmap(blkdev->xendev.gnttabdev, blkdev->sring, 1);
|
| 937 |
blkdev->cnt_map--; |
| 938 |
blkdev->sring = NULL;
|
| 939 |
} |
| 940 |
} |
| 941 |
|
| 942 |
static int blk_free(struct XenDevice *xendev) |
| 943 |
{
|
| 944 |
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); |
| 945 |
struct ioreq *ioreq;
|
| 946 |
|
| 947 |
if (blkdev->bs || blkdev->sring) {
|
| 948 |
blk_disconnect(xendev); |
| 949 |
} |
| 950 |
|
| 951 |
/* Free persistent grants */
|
| 952 |
if (blkdev->feature_persistent) {
|
| 953 |
g_tree_destroy(blkdev->persistent_gnts); |
| 954 |
} |
| 955 |
|
| 956 |
while (!QLIST_EMPTY(&blkdev->freelist)) {
|
| 957 |
ioreq = QLIST_FIRST(&blkdev->freelist); |
| 958 |
QLIST_REMOVE(ioreq, list); |
| 959 |
qemu_iovec_destroy(&ioreq->v); |
| 960 |
g_free(ioreq); |
| 961 |
} |
| 962 |
|
| 963 |
g_free(blkdev->params); |
| 964 |
g_free(blkdev->mode); |
| 965 |
g_free(blkdev->type); |
| 966 |
g_free(blkdev->dev); |
| 967 |
g_free(blkdev->devtype); |
| 968 |
qemu_bh_delete(blkdev->bh); |
| 969 |
return 0; |
| 970 |
} |
| 971 |
|
| 972 |
static void blk_event(struct XenDevice *xendev) |
| 973 |
{
|
| 974 |
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); |
| 975 |
|
| 976 |
qemu_bh_schedule(blkdev->bh); |
| 977 |
} |
| 978 |
|
| 979 |
struct XenDevOps xen_blkdev_ops = {
|
| 980 |
.size = sizeof(struct XenBlkDev), |
| 981 |
.flags = DEVOPS_FLAG_NEED_GNTDEV, |
| 982 |
.alloc = blk_alloc, |
| 983 |
.init = blk_init, |
| 984 |
.initialise = blk_connect, |
| 985 |
.disconnect = blk_disconnect, |
| 986 |
.event = blk_event, |
| 987 |
.free = blk_free, |
| 988 |
}; |