mirror of https://gitee.com/openkylin/qemu.git
Merge remote-tracking branch 'sstabellini/xen-2013-01-14' into staging
* sstabellini/xen-2013-01-14: xen_disk: implement BLKIF_OP_FLUSH_DISKCACHE, remove BLKIF_OP_WRITE_BARRIER xen_disk: add persistent grant support to xen_disk backend xen_disk: fix memory leak Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori
commit
5e72179b8f
208
hw/xen_disk.c
208
hw/xen_disk.c
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@ -51,6 +51,13 @@ static int max_requests = 32;
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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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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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struct ioreq {
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blkif_request_t req;
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int16_t status;
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@ -68,6 +75,7 @@ struct ioreq {
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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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/* aio status */
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int aio_inflight;
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@ -104,6 +112,12 @@ struct XenBlkDev {
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int requests_inflight;
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int requests_finished;
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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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/* qemu block driver */
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DriveInfo *dinfo;
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BlockDriverState *bs;
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@ -112,6 +126,54 @@ struct XenBlkDev {
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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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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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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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static struct ioreq *ioreq_start(struct XenBlkDev *blkdev)
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{
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struct ioreq *ioreq = NULL;
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@ -129,7 +191,6 @@ static struct ioreq *ioreq_start(struct XenBlkDev *blkdev)
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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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qemu_iovec_reset(&ioreq->v);
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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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@ -153,7 +214,7 @@ static void ioreq_release(struct ioreq *ioreq, bool finish)
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struct XenBlkDev *blkdev = ioreq->blkdev;
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QLIST_REMOVE(ioreq, list);
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memset(ioreq, 0, sizeof(*ioreq));
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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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@ -182,12 +243,11 @@ static int ioreq_parse(struct ioreq *ioreq)
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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_WRITE_BARRIER:
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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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ioreq->presync = 1;
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return 0;
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}
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ioreq->presync = ioreq->postsync = 1;
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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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@ -241,21 +301,21 @@ static void ioreq_unmap(struct ioreq *ioreq)
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XenGnttab gnt = ioreq->blkdev->xendev.gnttabdev;
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int i;
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if (ioreq->v.niov == 0 || ioreq->mapped == 0) {
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if (ioreq->num_unmap == 0 || ioreq->mapped == 0) {
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return;
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}
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if (batch_maps) {
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if (!ioreq->pages) {
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return;
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}
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if (xc_gnttab_munmap(gnt, ioreq->pages, ioreq->v.niov) != 0) {
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if (xc_gnttab_munmap(gnt, ioreq->pages, ioreq->num_unmap) != 0) {
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xen_be_printf(&ioreq->blkdev->xendev, 0, "xc_gnttab_munmap failed: %s\n",
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strerror(errno));
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}
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ioreq->blkdev->cnt_map -= ioreq->v.niov;
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ioreq->blkdev->cnt_map -= ioreq->num_unmap;
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ioreq->pages = NULL;
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} else {
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for (i = 0; i < ioreq->v.niov; i++) {
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for (i = 0; i < ioreq->num_unmap; i++) {
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if (!ioreq->page[i]) {
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continue;
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}
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@ -273,41 +333,120 @@ static void ioreq_unmap(struct ioreq *ioreq)
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static int ioreq_map(struct ioreq *ioreq)
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{
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XenGnttab gnt = ioreq->blkdev->xendev.gnttabdev;
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int i;
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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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void *page[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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int i, j, new_maps = 0;
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PersistentGrant *grant;
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/* domids and refs variables will contain the information necessary
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* to map the grants that are needed to fulfill this request.
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*
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* After mapping the needed grants, the page array will contain the
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* memory address of each granted page in the order specified in ioreq
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* (disregarding if it's a persistent grant or not).
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*/
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if (ioreq->v.niov == 0 || ioreq->mapped == 1) {
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return 0;
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}
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if (batch_maps) {
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if (ioreq->blkdev->feature_persistent) {
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for (i = 0; i < ioreq->v.niov; i++) {
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grant = g_tree_lookup(ioreq->blkdev->persistent_gnts,
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GUINT_TO_POINTER(ioreq->refs[i]));
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if (grant != NULL) {
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page[i] = grant->page;
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xen_be_printf(&ioreq->blkdev->xendev, 3,
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"using persistent-grant %" PRIu32 "\n",
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ioreq->refs[i]);
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} else {
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/* Add the grant to the list of grants that
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* should be mapped
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*/
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domids[new_maps] = ioreq->domids[i];
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refs[new_maps] = ioreq->refs[i];
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page[i] = NULL;
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new_maps++;
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}
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}
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/* Set the protection to RW, since grants may be reused later
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* with a different protection than the one needed for this request
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*/
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ioreq->prot = PROT_WRITE | PROT_READ;
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} else {
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/* All grants in the request should be mapped */
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memcpy(refs, ioreq->refs, sizeof(refs));
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memcpy(domids, ioreq->domids, sizeof(domids));
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memset(page, 0, sizeof(page));
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new_maps = ioreq->v.niov;
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}
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if (batch_maps && new_maps) {
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ioreq->pages = xc_gnttab_map_grant_refs
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(gnt, ioreq->v.niov, ioreq->domids, ioreq->refs, ioreq->prot);
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(gnt, new_maps, domids, refs, ioreq->prot);
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if (ioreq->pages == NULL) {
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xen_be_printf(&ioreq->blkdev->xendev, 0,
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"can't map %d grant refs (%s, %d maps)\n",
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ioreq->v.niov, strerror(errno), ioreq->blkdev->cnt_map);
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new_maps, strerror(errno), ioreq->blkdev->cnt_map);
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return -1;
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}
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for (i = 0; i < ioreq->v.niov; i++) {
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ioreq->v.iov[i].iov_base = ioreq->pages + i * XC_PAGE_SIZE +
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(uintptr_t)ioreq->v.iov[i].iov_base;
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for (i = 0, j = 0; i < ioreq->v.niov; i++) {
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if (page[i] == NULL) {
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page[i] = ioreq->pages + (j++) * XC_PAGE_SIZE;
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}
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}
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ioreq->blkdev->cnt_map += ioreq->v.niov;
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} else {
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for (i = 0; i < ioreq->v.niov; i++) {
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ioreq->blkdev->cnt_map += new_maps;
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} else if (new_maps) {
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for (i = 0; i < new_maps; i++) {
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ioreq->page[i] = xc_gnttab_map_grant_ref
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(gnt, ioreq->domids[i], ioreq->refs[i], ioreq->prot);
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(gnt, domids[i], refs[i], ioreq->prot);
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if (ioreq->page[i] == NULL) {
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xen_be_printf(&ioreq->blkdev->xendev, 0,
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"can't map grant ref %d (%s, %d maps)\n",
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ioreq->refs[i], strerror(errno), ioreq->blkdev->cnt_map);
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refs[i], strerror(errno), ioreq->blkdev->cnt_map);
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ioreq_unmap(ioreq);
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return -1;
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}
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ioreq->v.iov[i].iov_base = ioreq->page[i] + (uintptr_t)ioreq->v.iov[i].iov_base;
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ioreq->blkdev->cnt_map++;
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}
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for (i = 0, j = 0; i < ioreq->v.niov; i++) {
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if (page[i] == NULL) {
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page[i] = ioreq->page[j++];
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}
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}
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}
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if (ioreq->blkdev->feature_persistent) {
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while ((ioreq->blkdev->persistent_gnt_count < ioreq->blkdev->max_grants)
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&& new_maps) {
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/* Go through the list of newly mapped grants and add as many
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* as possible to the list of persistently mapped grants.
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*
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* Since we start at the end of ioreq->page(s), we only need
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* to decrease new_maps to prevent this granted pages from
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* being unmapped in ioreq_unmap.
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*/
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grant = g_malloc0(sizeof(*grant));
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new_maps--;
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if (batch_maps) {
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grant->page = ioreq->pages + (new_maps) * XC_PAGE_SIZE;
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} else {
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grant->page = ioreq->page[new_maps];
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}
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grant->blkdev = ioreq->blkdev;
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xen_be_printf(&ioreq->blkdev->xendev, 3,
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"adding grant %" PRIu32 " page: %p\n",
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refs[new_maps], grant->page);
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g_tree_insert(ioreq->blkdev->persistent_gnts,
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GUINT_TO_POINTER(refs[new_maps]),
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grant);
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ioreq->blkdev->persistent_gnt_count++;
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}
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}
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for (i = 0; i < ioreq->v.niov; i++) {
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ioreq->v.iov[i].iov_base += (uintptr_t)page[i];
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}
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ioreq->mapped = 1;
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ioreq->num_unmap = new_maps;
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return 0;
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}
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@ -369,7 +508,7 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
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qemu_aio_complete, ioreq);
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break;
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case BLKIF_OP_WRITE:
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case BLKIF_OP_WRITE_BARRIER:
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case BLKIF_OP_FLUSH_DISKCACHE:
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if (!ioreq->req.nr_segments) {
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break;
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}
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@ -654,7 +793,8 @@ static int blk_init(struct XenDevice *xendev)
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blkdev->file_size, blkdev->file_size >> 20);
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/* fill info */
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xenstore_write_be_int(&blkdev->xendev, "feature-barrier", 1);
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xenstore_write_be_int(&blkdev->xendev, "feature-flush-cache", 1);
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xenstore_write_be_int(&blkdev->xendev, "feature-persistent", 1);
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xenstore_write_be_int(&blkdev->xendev, "info", info);
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xenstore_write_be_int(&blkdev->xendev, "sector-size", blkdev->file_blk);
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xenstore_write_be_int(&blkdev->xendev, "sectors",
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@ -678,6 +818,7 @@ out_error:
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static int blk_connect(struct XenDevice *xendev)
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{
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struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
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int pers;
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if (xenstore_read_fe_int(&blkdev->xendev, "ring-ref", &blkdev->ring_ref) == -1) {
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return -1;
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@ -686,6 +827,11 @@ static int blk_connect(struct XenDevice *xendev)
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&blkdev->xendev.remote_port) == -1) {
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return -1;
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}
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if (xenstore_read_fe_int(&blkdev->xendev, "feature-persistent", &pers)) {
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blkdev->feature_persistent = FALSE;
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} else {
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blkdev->feature_persistent = !!pers;
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}
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blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
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if (blkdev->xendev.protocol) {
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@ -729,6 +875,15 @@ static int blk_connect(struct XenDevice *xendev)
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}
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}
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if (blkdev->feature_persistent) {
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/* Init persistent grants */
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blkdev->max_grants = max_requests * BLKIF_MAX_SEGMENTS_PER_REQUEST;
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blkdev->persistent_gnts = g_tree_new_full((GCompareDataFunc)int_cmp,
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NULL, NULL,
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(GDestroyNotify)destroy_grant);
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blkdev->persistent_gnt_count = 0;
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}
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xen_be_bind_evtchn(&blkdev->xendev);
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xen_be_printf(&blkdev->xendev, 1, "ok: proto %s, ring-ref %d, "
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@ -769,6 +924,11 @@ static int blk_free(struct XenDevice *xendev)
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blk_disconnect(xendev);
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}
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/* Free persistent grants */
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if (blkdev->feature_persistent) {
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g_tree_destroy(blkdev->persistent_gnts);
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}
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while (!QLIST_EMPTY(&blkdev->freelist)) {
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ioreq = QLIST_FIRST(&blkdev->freelist);
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QLIST_REMOVE(ioreq, list);
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