diff options
Diffstat (limited to 'hw/block/xen_disk.c')
| -rw-r--r-- | hw/block/xen_disk.c | 614 |
1 files changed, 102 insertions, 512 deletions
diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c index f74fcd42d1..9fbc0cdb87 100644 --- a/hw/block/xen_disk.c +++ b/hw/block/xen_disk.c @@ -36,27 +36,9 @@ /* ------------------------------------------------------------- */ -static int batch_maps = 0; - -/* ------------------------------------------------------------- */ - #define BLOCK_SIZE 512 #define IOCB_COUNT (BLKIF_MAX_SEGMENTS_PER_REQUEST + 2) -struct PersistentGrant { - void *page; - struct XenBlkDev *blkdev; -}; - -typedef struct PersistentGrant PersistentGrant; - -struct PersistentRegion { - void *addr; - int num; -}; - -typedef struct PersistentRegion PersistentRegion; - struct ioreq { blkif_request_t req; int16_t status; @@ -64,16 +46,9 @@ struct ioreq { /* parsed request */ off_t start; QEMUIOVector v; + void *buf; + size_t size; int presync; - uint8_t mapped; - - /* grant mapping */ - uint32_t domids[BLKIF_MAX_SEGMENTS_PER_REQUEST]; - uint32_t refs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; - int prot; - void *page[BLKIF_MAX_SEGMENTS_PER_REQUEST]; - void *pages; - int num_unmap; /* aio status */ int aio_inflight; @@ -104,7 +79,6 @@ struct XenBlkDev { int protocol; blkif_back_rings_t rings; int more_work; - int cnt_map; /* request lists */ QLIST_HEAD(inflight_head, ioreq) inflight; @@ -115,13 +89,7 @@ struct XenBlkDev { int requests_finished; unsigned int max_requests; - /* Persistent grants extension */ gboolean feature_discard; - gboolean feature_persistent; - GTree *persistent_gnts; - GSList *persistent_regions; - unsigned int persistent_gnt_count; - unsigned int max_grants; /* qemu block driver */ DriveInfo *dinfo; @@ -139,14 +107,9 @@ 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->mapped = 0; - - memset(ioreq->domids, 0, sizeof(ioreq->domids)); - memset(ioreq->refs, 0, sizeof(ioreq->refs)); - ioreq->prot = 0; - memset(ioreq->page, 0, sizeof(ioreq->page)); - ioreq->pages = NULL; ioreq->aio_inflight = 0; ioreq->aio_errors = 0; @@ -158,46 +121,6 @@ static void ioreq_reset(struct ioreq *ioreq) qemu_iovec_reset(&ioreq->v); } -static gint int_cmp(gconstpointer a, gconstpointer b, gpointer user_data) -{ - uint ua = GPOINTER_TO_UINT(a); - uint ub = GPOINTER_TO_UINT(b); - return (ua > ub) - (ua < ub); -} - -static void destroy_grant(gpointer pgnt) -{ - PersistentGrant *grant = pgnt; - xengnttab_handle *gnt = grant->blkdev->xendev.gnttabdev; - - if (xengnttab_unmap(gnt, grant->page, 1) != 0) { - xen_pv_printf(&grant->blkdev->xendev, 0, - "xengnttab_unmap failed: %s\n", - strerror(errno)); - } - grant->blkdev->persistent_gnt_count--; - xen_pv_printf(&grant->blkdev->xendev, 3, - "unmapped grant %p\n", grant->page); - g_free(grant); -} - -static void remove_persistent_region(gpointer data, gpointer dev) -{ - PersistentRegion *region = data; - struct XenBlkDev *blkdev = dev; - xengnttab_handle *gnt = blkdev->xendev.gnttabdev; - - if (xengnttab_unmap(gnt, region->addr, region->num) != 0) { - xen_pv_printf(&blkdev->xendev, 0, - "xengnttab_unmap region %p failed: %s\n", - region->addr, strerror(errno)); - } - xen_pv_printf(&blkdev->xendev, 3, - "unmapped grant region %p with %d pages\n", - region->addr, region->num); - g_free(region); -} - static struct ioreq *ioreq_start(struct XenBlkDev *blkdev) { struct ioreq *ioreq = NULL; @@ -210,7 +133,7 @@ static struct ioreq *ioreq_start(struct XenBlkDev *blkdev) ioreq = g_malloc0(sizeof(*ioreq)); ioreq->blkdev = blkdev; blkdev->requests_total++; - qemu_iovec_init(&ioreq->v, BLKIF_MAX_SEGMENTS_PER_REQUEST); + qemu_iovec_init(&ioreq->v, 1); } else { /* get one from freelist */ ioreq = QLIST_FIRST(&blkdev->freelist); @@ -255,17 +178,16 @@ static void ioreq_release(struct ioreq *ioreq, bool finish) static int ioreq_parse(struct ioreq *ioreq) { struct XenBlkDev *blkdev = ioreq->blkdev; - uintptr_t mem; + struct XenDevice *xendev = &blkdev->xendev; size_t len; int i; - xen_pv_printf(&blkdev->xendev, 3, + 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: - ioreq->prot = PROT_WRITE; /* to memory */ break; case BLKIF_OP_FLUSH_DISKCACHE: ioreq->presync = 1; @@ -274,45 +196,40 @@ static int ioreq_parse(struct ioreq *ioreq) } /* fall through */ case BLKIF_OP_WRITE: - ioreq->prot = PROT_READ; /* from memory */ break; case BLKIF_OP_DISCARD: return 0; default: - xen_pv_printf(&blkdev->xendev, 0, "error: unknown operation (%d)\n", + 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(&blkdev->xendev, 0, "error: write req for ro device\n"); + 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(&blkdev->xendev, 0, "error: nr_segments too big\n"); + 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(&blkdev->xendev, 0, "error: first > last sector\n"); + 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(&blkdev->xendev, 0, "error: page crossing\n"); + xen_pv_printf(xendev, 0, "error: page crossing\n"); goto err; } - ioreq->domids[i] = blkdev->xendev.dom; - ioreq->refs[i] = ioreq->req.seg[i].gref; - - mem = ioreq->req.seg[i].first_sect * blkdev->file_blk; len = (ioreq->req.seg[i].last_sect - ioreq->req.seg[i].first_sect + 1) * blkdev->file_blk; - qemu_iovec_add(&ioreq->v, (void*)mem, len); + ioreq->size += len; } - if (ioreq->start + ioreq->v.size > blkdev->file_size) { - xen_pv_printf(&blkdev->xendev, 0, "error: access beyond end of file\n"); + if (ioreq->start + ioreq->size > blkdev->file_size) { + xen_pv_printf(xendev, 0, "error: access beyond end of file\n"); goto err; } return 0; @@ -322,279 +239,48 @@ err: return -1; } -static void ioreq_unmap(struct ioreq *ioreq) -{ - xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev; - int i; - - if (ioreq->num_unmap == 0 || ioreq->mapped == 0) { - return; - } - if (batch_maps) { - if (!ioreq->pages) { - return; - } - if (xengnttab_unmap(gnt, ioreq->pages, ioreq->num_unmap) != 0) { - xen_pv_printf(&ioreq->blkdev->xendev, 0, - "xengnttab_unmap failed: %s\n", - strerror(errno)); - } - ioreq->blkdev->cnt_map -= ioreq->num_unmap; - ioreq->pages = NULL; - } else { - for (i = 0; i < ioreq->num_unmap; i++) { - if (!ioreq->page[i]) { - continue; - } - if (xengnttab_unmap(gnt, ioreq->page[i], 1) != 0) { - xen_pv_printf(&ioreq->blkdev->xendev, 0, - "xengnttab_unmap failed: %s\n", - strerror(errno)); - } - ioreq->blkdev->cnt_map--; - ioreq->page[i] = NULL; - } - } - ioreq->mapped = 0; -} - -static int ioreq_map(struct ioreq *ioreq) -{ - xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev; - uint32_t domids[BLKIF_MAX_SEGMENTS_PER_REQUEST]; - uint32_t refs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; - void *page[BLKIF_MAX_SEGMENTS_PER_REQUEST]; - int i, j, new_maps = 0; - PersistentGrant *grant; - PersistentRegion *region; - /* domids and refs variables will contain the information necessary - * to map the grants that are needed to fulfill this request. - * - * After mapping the needed grants, the page array will contain the - * memory address of each granted page in the order specified in ioreq - * (disregarding if it's a persistent grant or not). - */ - - if (ioreq->v.niov == 0 || ioreq->mapped == 1) { - return 0; - } - if (ioreq->blkdev->feature_persistent) { - for (i = 0; i < ioreq->v.niov; i++) { - grant = g_tree_lookup(ioreq->blkdev->persistent_gnts, - GUINT_TO_POINTER(ioreq->refs[i])); - - if (grant != NULL) { - page[i] = grant->page; - xen_pv_printf(&ioreq->blkdev->xendev, 3, - "using persistent-grant %" PRIu32 "\n", - ioreq->refs[i]); - } else { - /* Add the grant to the list of grants that - * should be mapped - */ - domids[new_maps] = ioreq->domids[i]; - refs[new_maps] = ioreq->refs[i]; - page[i] = NULL; - new_maps++; - } - } - /* Set the protection to RW, since grants may be reused later - * with a different protection than the one needed for this request - */ - ioreq->prot = PROT_WRITE | PROT_READ; - } else { - /* All grants in the request should be mapped */ - memcpy(refs, ioreq->refs, sizeof(refs)); - memcpy(domids, ioreq->domids, sizeof(domids)); - memset(page, 0, sizeof(page)); - new_maps = ioreq->v.niov; - } - - if (batch_maps && new_maps) { - ioreq->pages = xengnttab_map_grant_refs - (gnt, new_maps, domids, refs, ioreq->prot); - if (ioreq->pages == NULL) { - xen_pv_printf(&ioreq->blkdev->xendev, 0, - "can't map %d grant refs (%s, %d maps)\n", - new_maps, strerror(errno), ioreq->blkdev->cnt_map); - return -1; - } - for (i = 0, j = 0; i < ioreq->v.niov; i++) { - if (page[i] == NULL) { - page[i] = ioreq->pages + (j++) * XC_PAGE_SIZE; - } - } - ioreq->blkdev->cnt_map += new_maps; - } else if (new_maps) { - for (i = 0; i < new_maps; i++) { - ioreq->page[i] = xengnttab_map_grant_ref - (gnt, domids[i], refs[i], ioreq->prot); - if (ioreq->page[i] == NULL) { - xen_pv_printf(&ioreq->blkdev->xendev, 0, - "can't map grant ref %d (%s, %d maps)\n", - refs[i], strerror(errno), ioreq->blkdev->cnt_map); - ioreq->mapped = 1; - ioreq_unmap(ioreq); - return -1; - } - ioreq->blkdev->cnt_map++; - } - for (i = 0, j = 0; i < ioreq->v.niov; i++) { - if (page[i] == NULL) { - page[i] = ioreq->page[j++]; - } - } - } - if (ioreq->blkdev->feature_persistent && new_maps != 0 && - (!batch_maps || (ioreq->blkdev->persistent_gnt_count + new_maps <= - ioreq->blkdev->max_grants))) { - /* - * If we are using persistent grants and batch mappings only - * add the new maps to the list of persistent grants if the whole - * area can be persistently mapped. - */ - if (batch_maps) { - region = g_malloc0(sizeof(*region)); - region->addr = ioreq->pages; - region->num = new_maps; - ioreq->blkdev->persistent_regions = g_slist_append( - ioreq->blkdev->persistent_regions, - region); - } - while ((ioreq->blkdev->persistent_gnt_count < ioreq->blkdev->max_grants) - && new_maps) { - /* Go through the list of newly mapped grants and add as many - * as possible to the list of persistently mapped grants. - * - * Since we start at the end of ioreq->page(s), we only need - * to decrease new_maps to prevent this granted pages from - * being unmapped in ioreq_unmap. - */ - grant = g_malloc0(sizeof(*grant)); - new_maps--; - if (batch_maps) { - grant->page = ioreq->pages + (new_maps) * XC_PAGE_SIZE; - } else { - grant->page = ioreq->page[new_maps]; - } - grant->blkdev = ioreq->blkdev; - xen_pv_printf(&ioreq->blkdev->xendev, 3, - "adding grant %" PRIu32 " page: %p\n", - refs[new_maps], grant->page); - g_tree_insert(ioreq->blkdev->persistent_gnts, - GUINT_TO_POINTER(refs[new_maps]), - grant); - ioreq->blkdev->persistent_gnt_count++; - } - assert(!batch_maps || new_maps == 0); - } - for (i = 0; i < ioreq->v.niov; i++) { - ioreq->v.iov[i].iov_base += (uintptr_t)page[i]; - } - ioreq->mapped = 1; - ioreq->num_unmap = new_maps; - return 0; -} - -#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40800 - -static void ioreq_free_copy_buffers(struct ioreq *ioreq) -{ - int i; - - for (i = 0; i < ioreq->v.niov; i++) { - ioreq->page[i] = NULL; - } - - qemu_vfree(ioreq->pages); -} - -static int ioreq_init_copy_buffers(struct ioreq *ioreq) -{ - int i; - - if (ioreq->v.niov == 0) { - return 0; - } - - ioreq->pages = qemu_memalign(XC_PAGE_SIZE, ioreq->v.niov * XC_PAGE_SIZE); - - for (i = 0; i < ioreq->v.niov; i++) { - ioreq->page[i] = ioreq->pages + i * XC_PAGE_SIZE; - ioreq->v.iov[i].iov_base = ioreq->page[i]; - } - - return 0; -} - static int ioreq_grant_copy(struct ioreq *ioreq) { - xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev; - xengnttab_grant_copy_segment_t segs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; + struct XenBlkDev *blkdev = ioreq->blkdev; + struct XenDevice *xendev = &blkdev->xendev; + XenGrantCopySegment segs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; int i, count, rc; - int64_t file_blk = ioreq->blkdev->file_blk; + int64_t file_blk = blkdev->file_blk; + bool to_domain = (ioreq->req.operation == BLKIF_OP_READ); + void *virt = ioreq->buf; - if (ioreq->v.niov == 0) { + if (ioreq->req.nr_segments == 0) { return 0; } - count = ioreq->v.niov; + count = ioreq->req.nr_segments; for (i = 0; i < count; i++) { - if (ioreq->req.operation == BLKIF_OP_READ) { - segs[i].flags = GNTCOPY_dest_gref; - segs[i].dest.foreign.ref = ioreq->refs[i]; - segs[i].dest.foreign.domid = ioreq->domids[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 = ioreq->v.iov[i].iov_base; + segs[i].source.virt = virt; } else { - segs[i].flags = GNTCOPY_source_gref; - segs[i].source.foreign.ref = ioreq->refs[i]; - segs[i].source.foreign.domid = ioreq->domids[i]; + 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 = ioreq->v.iov[i].iov_base; + 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 = xengnttab_grant_copy(gnt, count, segs); + rc = xen_be_copy_grant_refs(xendev, to_domain, segs, count); if (rc) { - xen_pv_printf(&ioreq->blkdev->xendev, 0, + xen_pv_printf(xendev, 0, "failed to copy data %d\n", rc); ioreq->aio_errors++; return -1; } - for (i = 0; i < count; i++) { - if (segs[i].status != GNTST_okay) { - xen_pv_printf(&ioreq->blkdev->xendev, 3, - "failed to copy data %d for gref %d, domid %d\n", - segs[i].status, ioreq->refs[i], ioreq->domids[i]); - ioreq->aio_errors++; - rc = -1; - } - } - return rc; } -#else -static void ioreq_free_copy_buffers(struct ioreq *ioreq) -{ - abort(); -} - -static int ioreq_init_copy_buffers(struct ioreq *ioreq) -{ - abort(); -} - -static int ioreq_grant_copy(struct ioreq *ioreq) -{ - abort(); -} -#endif static int ioreq_runio_qemu_aio(struct ioreq *ioreq); @@ -602,11 +288,12 @@ static void qemu_aio_complete(void *opaque, int ret) { struct ioreq *ioreq = opaque; struct XenBlkDev *blkdev = ioreq->blkdev; + struct XenDevice *xendev = &blkdev->xendev; aio_context_acquire(blkdev->ctx); if (ret != 0) { - xen_pv_printf(&blkdev->xendev, 0, "%s I/O error\n", + xen_pv_printf(xendev, 0, "%s I/O error\n", ioreq->req.operation == BLKIF_OP_READ ? "read" : "write"); ioreq->aio_errors++; } @@ -621,32 +308,28 @@ static void qemu_aio_complete(void *opaque, int ret) goto done; } - if (xen_feature_grant_copy) { - switch (ioreq->req.operation) { - case BLKIF_OP_READ: - /* in case of failure ioreq->aio_errors is increased */ - if (ret == 0) { - ioreq_grant_copy(ioreq); - } - ioreq_free_copy_buffers(ioreq); - break; - case BLKIF_OP_WRITE: - case BLKIF_OP_FLUSH_DISKCACHE: - if (!ioreq->req.nr_segments) { - break; - } - ioreq_free_copy_buffers(ioreq); - break; - default: + 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; - if (!xen_feature_grant_copy) { - ioreq_unmap(ioreq); - } ioreq_finish(ioreq); + switch (ioreq->req.operation) { case BLKIF_OP_WRITE: case BLKIF_OP_FLUSH_DISKCACHE: @@ -706,18 +389,13 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq) { struct XenBlkDev *blkdev = ioreq->blkdev; - if (xen_feature_grant_copy) { - ioreq_init_copy_buffers(ioreq); - if (ioreq->req.nr_segments && (ioreq->req.operation == BLKIF_OP_WRITE || - ioreq->req.operation == BLKIF_OP_FLUSH_DISKCACHE) && - ioreq_grant_copy(ioreq)) { - ioreq_free_copy_buffers(ioreq); - goto err; - } - } else { - if (ioreq->req.nr_segments && ioreq_map(ioreq)) { - goto err; - } + 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++; @@ -728,6 +406,7 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq) 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++; @@ -740,6 +419,7 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq) 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 ? @@ -758,9 +438,6 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq) } default: /* unknown operation (shouldn't happen -- parse catches this) */ - if (!xen_feature_grant_copy) { - ioreq_unmap(ioreq); - } goto err; } @@ -946,24 +623,21 @@ static void blk_alloc(struct XenDevice *xendev) blkdev->ctx = iothread_get_aio_context(blkdev->iothread); blkdev->bh = aio_bh_new(blkdev->ctx, blk_bh, blkdev); - - if (xen_mode != XEN_EMULATE) { - batch_maps = 1; - } } static void blk_parse_discard(struct XenBlkDev *blkdev) { + struct XenDevice *xendev = &blkdev->xendev; int enable; blkdev->feature_discard = true; - if (xenstore_read_be_int(&blkdev->xendev, "discard-enable", &enable) == 0) { + if (xenstore_read_be_int(xendev, "discard-enable", &enable) == 0) { blkdev->feature_discard = !!enable; } if (blkdev->feature_discard) { - xenstore_write_be_int(&blkdev->xendev, "feature-discard", 1); + xenstore_write_be_int(xendev, "feature-discard", 1); } } @@ -978,7 +652,7 @@ static int blk_init(struct XenDevice *xendev) /* read xenstore entries */ if (blkdev->params == NULL) { char *h = NULL; - blkdev->params = xenstore_read_be_str(&blkdev->xendev, "params"); + blkdev->params = xenstore_read_be_str(xendev, "params"); if (blkdev->params != NULL) { h = strchr(blkdev->params, ':'); } @@ -998,18 +672,18 @@ static int blk_init(struct XenDevice *xendev) blkdev->fileproto = "vpc"; } if (blkdev->mode == NULL) { - blkdev->mode = xenstore_read_be_str(&blkdev->xendev, "mode"); + blkdev->mode = xenstore_read_be_str(xendev, "mode"); } if (blkdev->type == NULL) { - blkdev->type = xenstore_read_be_str(&blkdev->xendev, "type"); + blkdev->type = xenstore_read_be_str(xendev, "type"); } if (blkdev->dev == NULL) { - blkdev->dev = xenstore_read_be_str(&blkdev->xendev, "dev"); + blkdev->dev = xenstore_read_be_str(xendev, "dev"); } if (blkdev->devtype == NULL) { - blkdev->devtype = xenstore_read_be_str(&blkdev->xendev, "device-type"); + blkdev->devtype = xenstore_read_be_str(xendev, "device-type"); } - directiosafe = xenstore_read_be_str(&blkdev->xendev, "direct-io-safe"); + directiosafe = xenstore_read_be_str(xendev, "direct-io-safe"); blkdev->directiosafe = (directiosafe && atoi(directiosafe)); /* do we have all we need? */ @@ -1032,18 +706,13 @@ static int blk_init(struct XenDevice *xendev) blkdev->file_blk = BLOCK_SIZE; - xen_pv_printf(&blkdev->xendev, 3, "grant copy operation %s\n", - xen_feature_grant_copy ? "enabled" : "disabled"); - /* fill info * blk_connect supplies sector-size and sectors */ - xenstore_write_be_int(&blkdev->xendev, "feature-flush-cache", 1); - xenstore_write_be_int(&blkdev->xendev, "feature-persistent", - !xen_feature_grant_copy); - xenstore_write_be_int(&blkdev->xendev, "info", info); + xenstore_write_be_int(xendev, "feature-flush-cache", 1); + xenstore_write_be_int(xendev, "info", info); - xenstore_write_be_int(&blkdev->xendev, "max-ring-page-order", + xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_PAGE_ORDER); blk_parse_discard(blkdev); @@ -1067,25 +736,15 @@ out_error: return -1; } -/* - * We need to account for the grant allocations requiring contiguous - * chunks; the worst case number would be - * max_req * max_seg + (max_req - 1) * (max_seg - 1) + 1, - * but in order to keep things simple just use - * 2 * max_req * max_seg. - */ -#define MAX_GRANTS(max_req, max_seg) (2 * (max_req) * (max_seg)) - static int blk_connect(struct XenDevice *xendev) { struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); - int pers, index, qflags; + int index, qflags; bool readonly = true; bool writethrough = true; int order, ring_ref; unsigned int ring_size, max_grants; unsigned int i; - uint32_t *domids; trace_xen_disk_connect(xendev->name); @@ -1105,7 +764,7 @@ static int blk_connect(struct XenDevice *xendev) } /* init qemu block driver */ - index = (blkdev->xendev.dev - 202 * 256) / 16; + index = (xendev->dev - 202 * 256) / 16; blkdev->dinfo = drive_get(IF_XEN, 0, index); if (!blkdev->dinfo) { Error *local_err = NULL; @@ -1117,11 +776,11 @@ static int blk_connect(struct XenDevice *xendev) } /* setup via xenbus -> create new block driver instance */ - xen_pv_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n"); + 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(&blkdev->xendev, 0, "error: %s\n", + xen_pv_printf(xendev, 0, "error: %s\n", error_get_pretty(local_err)); error_free(local_err); return -1; @@ -1129,11 +788,11 @@ static int blk_connect(struct XenDevice *xendev) blk_set_enable_write_cache(blkdev->blk, !writethrough); } else { /* setup via qemu cmdline -> already setup for us */ - xen_pv_printf(&blkdev->xendev, 2, + 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(&blkdev->xendev, 0, "Unexpected read-only drive"); + xen_pv_printf(xendev, 0, "Unexpected read-only drive"); blkdev->blk = NULL; return -1; } @@ -1146,7 +805,7 @@ static int blk_connect(struct XenDevice *xendev) 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(&blkdev->xendev, 1, "blk_getlength: %d (%s) | drv %s\n", + 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; @@ -1158,15 +817,15 @@ static int blk_connect(struct XenDevice *xendev) blkdev->file_size, blkdev->file_size >> 20); /* Fill in number of sector size and number of sectors */ - xenstore_write_be_int(&blkdev->xendev, "sector-size", blkdev->file_blk); - xenstore_write_be_int64(&blkdev->xendev, "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(&blkdev->xendev, "ring-page-order", + if (xenstore_read_fe_int(xendev, "ring-page-order", &order) == -1) { blkdev->nr_ring_ref = 1; - if (xenstore_read_fe_int(&blkdev->xendev, "ring-ref", + if (xenstore_read_fe_int(xendev, "ring-ref", &ring_ref) == -1) { return -1; } @@ -1183,7 +842,7 @@ static int blk_connect(struct XenDevice *xendev) return -1; } - if (xenstore_read_fe_int(&blkdev->xendev, key, + if (xenstore_read_fe_int(xendev, key, &ring_ref) == -1) { g_free(key); return -1; @@ -1198,23 +857,18 @@ static int blk_connect(struct XenDevice *xendev) return -1; } - if (xenstore_read_fe_int(&blkdev->xendev, "event-channel", - &blkdev->xendev.remote_port) == -1) { + if (xenstore_read_fe_int(xendev, "event-channel", + &xendev->remote_port) == -1) { return -1; } - if (xenstore_read_fe_int(&blkdev->xendev, "feature-persistent", &pers)) { - blkdev->feature_persistent = FALSE; - } else { - blkdev->feature_persistent = !!pers; - } - if (!blkdev->xendev.protocol) { + if (!xendev->protocol) { blkdev->protocol = BLKIF_PROTOCOL_NATIVE; - } else if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_NATIVE) == 0) { + } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_NATIVE) == 0) { blkdev->protocol = BLKIF_PROTOCOL_NATIVE; - } else if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_32) == 0) { + } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_32) == 0) { blkdev->protocol = BLKIF_PROTOCOL_X86_32; - } else if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_64) == 0) { + } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_64) == 0) { blkdev->protocol = BLKIF_PROTOCOL_X86_64; } else { blkdev->protocol = BLKIF_PROTOCOL_NATIVE; @@ -1241,43 +895,17 @@ static int blk_connect(struct XenDevice *xendev) return -1; } - /* Calculate the maximum number of grants needed by ioreqs */ - max_grants = MAX_GRANTS(blkdev->max_requests, - BLKIF_MAX_SEGMENTS_PER_REQUEST); /* Add on the number needed for the ring pages */ - max_grants += blkdev->nr_ring_ref; - - blkdev->xendev.gnttabdev = xengnttab_open(NULL, 0); - if (blkdev->xendev.gnttabdev == NULL) { - xen_pv_printf(xendev, 0, "xengnttab_open failed: %s\n", - strerror(errno)); - return -1; - } - if (xengnttab_set_max_grants(blkdev->xendev.gnttabdev, max_grants)) { - xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n", - strerror(errno)); - return -1; - } - - domids = g_new0(uint32_t, blkdev->nr_ring_ref); - for (i = 0; i < blkdev->nr_ring_ref; i++) { - domids[i] = blkdev->xendev.dom; - } - - blkdev->sring = xengnttab_map_grant_refs(blkdev->xendev.gnttabdev, - blkdev->nr_ring_ref, - domids, - blkdev->ring_ref, - PROT_READ | PROT_WRITE); - - g_free(domids); + 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; } - blkdev->cnt_map++; - switch (blkdev->protocol) { case BLKIF_PROTOCOL_NATIVE: { @@ -1301,27 +929,14 @@ static int blk_connect(struct XenDevice *xendev) } } - if (blkdev->feature_persistent) { - /* Init persistent grants */ - blkdev->max_grants = blkdev->max_requests * - BLKIF_MAX_SEGMENTS_PER_REQUEST; - blkdev->persistent_gnts = g_tree_new_full((GCompareDataFunc)int_cmp, - NULL, NULL, - batch_maps ? - (GDestroyNotify)g_free : - (GDestroyNotify)destroy_grant); - blkdev->persistent_regions = NULL; - blkdev->persistent_gnt_count = 0; - } - blk_set_aio_context(blkdev->blk, blkdev->ctx); - xen_be_bind_evtchn(&blkdev->xendev); + xen_be_bind_evtchn(xendev); - xen_pv_printf(&blkdev->xendev, 1, "ok: proto %s, nr-ring-ref %u, " + xen_pv_printf(xendev, 1, "ok: proto %s, nr-ring-ref %u, " "remote port %d, local port %d\n", - blkdev->xendev.protocol, blkdev->nr_ring_ref, - blkdev->xendev.remote_port, blkdev->xendev.local_port); + xendev->protocol, blkdev->nr_ring_ref, + xendev->remote_port, xendev->local_port); return 0; } @@ -1339,41 +954,15 @@ static void blk_disconnect(struct XenDevice *xendev) blk_unref(blkdev->blk); blkdev->blk = NULL; } - xen_pv_unbind_evtchn(&blkdev->xendev); + xen_pv_unbind_evtchn(xendev); aio_context_release(blkdev->ctx); if (blkdev->sring) { - xengnttab_unmap(blkdev->xendev.gnttabdev, blkdev->sring, - blkdev->nr_ring_ref); - blkdev->cnt_map--; + xen_be_unmap_grant_refs(xendev, blkdev->sring, + blkdev->nr_ring_ref); blkdev->sring = NULL; } - - /* - * Unmap persistent grants before switching to the closed state - * so the frontend can free them. - * - * In the !batch_maps case g_tree_destroy will take care of unmapping - * the grant, but in the batch_maps case we need to iterate over every - * region in persistent_regions and unmap it. - */ - if (blkdev->feature_persistent) { - g_tree_destroy(blkdev->persistent_gnts); - assert(batch_maps || blkdev->persistent_gnt_count == 0); - if (batch_maps) { - blkdev->persistent_gnt_count = 0; - g_slist_foreach(blkdev->persistent_regions, - (GFunc)remove_persistent_region, blkdev); - g_slist_free(blkdev->persistent_regions); - } - blkdev->feature_persistent = false; - } - - if (blkdev->xendev.gnttabdev) { - xengnttab_close(blkdev->xendev.gnttabdev); - blkdev->xendev.gnttabdev = NULL; - } } static int blk_free(struct XenDevice *xendev) @@ -1410,10 +999,11 @@ static void blk_event(struct XenDevice *xendev) } struct XenDevOps xen_blkdev_ops = { + .flags = DEVOPS_FLAG_NEED_GNTDEV, .size = sizeof(struct XenBlkDev), .alloc = blk_alloc, .init = blk_init, - .initialise = blk_connect, + .initialise = blk_connect, .disconnect = blk_disconnect, .event = blk_event, .free = blk_free, |