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authorRajithaY <rajithax.yerrumsetty@intel.com>2017-04-25 03:31:15 -0700
committerRajitha Yerrumchetty <rajithax.yerrumsetty@intel.com>2017-05-22 06:48:08 +0000
commitbb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch)
treeca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/hw/block/xen_disk.c
parenta14b48d18a9ed03ec191cf16b162206998a895ce (diff)
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to kvmfornfv repo and make use of the updated latest qemu for the execution of all testcase Change-Id: I1280af507a857675c7f81d30c95255635667bdd7 Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
Diffstat (limited to 'qemu/hw/block/xen_disk.c')
-rw-r--r--qemu/hw/block/xen_disk.c1121
1 files changed, 0 insertions, 1121 deletions
diff --git a/qemu/hw/block/xen_disk.c b/qemu/hw/block/xen_disk.c
deleted file mode 100644
index d4ce380fe..000000000
--- a/qemu/hw/block/xen_disk.c
+++ /dev/null
@@ -1,1121 +0,0 @@
-/*
- * xen paravirt block device backend
- *
- * (c) Gerd Hoffmann <kraxel@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; under version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, see <http://www.gnu.org/licenses/>.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/osdep.h"
-#include <sys/ioctl.h>
-#include <sys/mman.h>
-#include <sys/uio.h>
-
-#include "hw/hw.h"
-#include "hw/xen/xen_backend.h"
-#include "xen_blkif.h"
-#include "sysemu/blockdev.h"
-#include "sysemu/block-backend.h"
-#include "qapi/error.h"
-#include "qapi/qmp/qdict.h"
-#include "qapi/qmp/qstring.h"
-
-/* ------------------------------------------------------------- */
-
-static int batch_maps = 0;
-
-static int max_requests = 32;
-
-/* ------------------------------------------------------------- */
-
-#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;
-
- /* parsed request */
- off_t start;
- QEMUIOVector v;
- 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;
- int aio_errors;
-
- struct XenBlkDev *blkdev;
- QLIST_ENTRY(ioreq) list;
- BlockAcctCookie acct;
-};
-
-struct XenBlkDev {
- struct XenDevice xendev; /* must be first */
- char *params;
- char *mode;
- char *type;
- char *dev;
- char *devtype;
- bool directiosafe;
- const char *fileproto;
- const char *filename;
- int ring_ref;
- void *sring;
- int64_t file_blk;
- int64_t file_size;
- int protocol;
- blkif_back_rings_t rings;
- int more_work;
- int cnt_map;
-
- /* request lists */
- QLIST_HEAD(inflight_head, ioreq) inflight;
- QLIST_HEAD(finished_head, ioreq) finished;
- QLIST_HEAD(freelist_head, ioreq) freelist;
- int requests_total;
- int requests_inflight;
- int requests_finished;
-
- /* 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;
- BlockBackend *blk;
- QEMUBH *bh;
-};
-
-/* ------------------------------------------------------------- */
-
-static void ioreq_reset(struct ioreq *ioreq)
-{
- memset(&ioreq->req, 0, sizeof(ioreq->req));
- ioreq->status = 0;
- ioreq->start = 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;
-
- ioreq->blkdev = NULL;
- memset(&ioreq->list, 0, sizeof(ioreq->list));
- memset(&ioreq->acct, 0, sizeof(ioreq->acct));
-
- 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_be_printf(&grant->blkdev->xendev, 0,
- "xengnttab_unmap failed: %s\n",
- strerror(errno));
- }
- grant->blkdev->persistent_gnt_count--;
- xen_be_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_be_printf(&blkdev->xendev, 0,
- "xengnttab_unmap region %p failed: %s\n",
- region->addr, strerror(errno));
- }
- xen_be_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;
-
- if (QLIST_EMPTY(&blkdev->freelist)) {
- if (blkdev->requests_total >= max_requests) {
- goto out;
- }
- /* allocate new struct */
- ioreq = g_malloc0(sizeof(*ioreq));
- ioreq->blkdev = blkdev;
- blkdev->requests_total++;
- qemu_iovec_init(&ioreq->v, BLKIF_MAX_SEGMENTS_PER_REQUEST);
- } else {
- /* get one from freelist */
- ioreq = QLIST_FIRST(&blkdev->freelist);
- QLIST_REMOVE(ioreq, list);
- }
- QLIST_INSERT_HEAD(&blkdev->inflight, ioreq, list);
- blkdev->requests_inflight++;
-
-out:
- return ioreq;
-}
-
-static void ioreq_finish(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
-
- QLIST_REMOVE(ioreq, list);
- QLIST_INSERT_HEAD(&blkdev->finished, ioreq, list);
- blkdev->requests_inflight--;
- blkdev->requests_finished++;
-}
-
-static void ioreq_release(struct ioreq *ioreq, bool finish)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
-
- QLIST_REMOVE(ioreq, list);
- ioreq_reset(ioreq);
- ioreq->blkdev = blkdev;
- QLIST_INSERT_HEAD(&blkdev->freelist, ioreq, list);
- if (finish) {
- blkdev->requests_finished--;
- } else {
- blkdev->requests_inflight--;
- }
-}
-
-/*
- * translate request into iovec + start offset
- * do sanity checks along the way
- */
-static int ioreq_parse(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
- uintptr_t mem;
- size_t len;
- int i;
-
- xen_be_printf(&blkdev->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;
- if (!ioreq->req.nr_segments) {
- return 0;
- }
- /* fall through */
- case BLKIF_OP_WRITE:
- ioreq->prot = PROT_READ; /* from memory */
- break;
- case BLKIF_OP_DISCARD:
- return 0;
- default:
- xen_be_printf(&blkdev->xendev, 0, "error: unknown operation (%d)\n",
- ioreq->req.operation);
- goto err;
- };
-
- if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') {
- xen_be_printf(&blkdev->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_be_printf(&blkdev->xendev, 0, "error: nr_segments too big\n");
- goto err;
- }
- if (ioreq->req.seg[i].first_sect > ioreq->req.seg[i].last_sect) {
- xen_be_printf(&blkdev->xendev, 0, "error: first > last sector\n");
- goto err;
- }
- if (ioreq->req.seg[i].last_sect * BLOCK_SIZE >= XC_PAGE_SIZE) {
- xen_be_printf(&blkdev->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);
- }
- if (ioreq->start + ioreq->v.size > blkdev->file_size) {
- xen_be_printf(&blkdev->xendev, 0, "error: access beyond end of file\n");
- goto err;
- }
- return 0;
-
-err:
- ioreq->status = BLKIF_RSP_ERROR;
- 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_be_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_be_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_be_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_be_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_be_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_be_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;
-}
-
-static int ioreq_runio_qemu_aio(struct ioreq *ioreq);
-
-static void qemu_aio_complete(void *opaque, int ret)
-{
- struct ioreq *ioreq = opaque;
-
- if (ret != 0) {
- xen_be_printf(&ioreq->blkdev->xendev, 0, "%s I/O error\n",
- ioreq->req.operation == BLKIF_OP_READ ? "read" : "write");
- ioreq->aio_errors++;
- }
-
- ioreq->aio_inflight--;
- if (ioreq->presync) {
- ioreq->presync = 0;
- ioreq_runio_qemu_aio(ioreq);
- return;
- }
- if (ioreq->aio_inflight > 0) {
- return;
- }
-
- ioreq->status = ioreq->aio_errors ? BLKIF_RSP_ERROR : BLKIF_RSP_OKAY;
- ioreq_unmap(ioreq);
- ioreq_finish(ioreq);
- switch (ioreq->req.operation) {
- case BLKIF_OP_WRITE:
- case BLKIF_OP_FLUSH_DISKCACHE:
- if (!ioreq->req.nr_segments) {
- break;
- }
- case BLKIF_OP_READ:
- if (ioreq->status == BLKIF_RSP_OKAY) {
- block_acct_done(blk_get_stats(ioreq->blkdev->blk), &ioreq->acct);
- } else {
- block_acct_failed(blk_get_stats(ioreq->blkdev->blk), &ioreq->acct);
- }
- break;
- case BLKIF_OP_DISCARD:
- default:
- break;
- }
- qemu_bh_schedule(ioreq->blkdev->bh);
-}
-
-static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
-
- if (ioreq->req.nr_segments && ioreq_map(ioreq) == -1) {
- goto err_no_map;
- }
-
- ioreq->aio_inflight++;
- if (ioreq->presync) {
- blk_aio_flush(ioreq->blkdev->blk, qemu_aio_complete, ioreq);
- return 0;
- }
-
- switch (ioreq->req.operation) {
- case BLKIF_OP_READ:
- block_acct_start(blk_get_stats(blkdev->blk), &ioreq->acct,
- ioreq->v.size, BLOCK_ACCT_READ);
- ioreq->aio_inflight++;
- blk_aio_readv(blkdev->blk, ioreq->start / BLOCK_SIZE,
- &ioreq->v, ioreq->v.size / BLOCK_SIZE,
- qemu_aio_complete, ioreq);
- break;
- case BLKIF_OP_WRITE:
- case BLKIF_OP_FLUSH_DISKCACHE:
- if (!ioreq->req.nr_segments) {
- break;
- }
-
- block_acct_start(blk_get_stats(blkdev->blk), &ioreq->acct,
- ioreq->v.size,
- ioreq->req.operation == BLKIF_OP_WRITE ?
- BLOCK_ACCT_WRITE : BLOCK_ACCT_FLUSH);
- ioreq->aio_inflight++;
- blk_aio_writev(blkdev->blk, ioreq->start / BLOCK_SIZE,
- &ioreq->v, ioreq->v.size / BLOCK_SIZE,
- qemu_aio_complete, ioreq);
- break;
- case BLKIF_OP_DISCARD:
- {
- struct blkif_request_discard *discard_req = (void *)&ioreq->req;
- ioreq->aio_inflight++;
- blk_aio_discard(blkdev->blk,
- discard_req->sector_number, discard_req->nr_sectors,
- qemu_aio_complete, ioreq);
- break;
- }
- default:
- /* unknown operation (shouldn't happen -- parse catches this) */
- goto err;
- }
-
- qemu_aio_complete(ioreq, 0);
-
- return 0;
-
-err:
- ioreq_unmap(ioreq);
-err_no_map:
- ioreq_finish(ioreq);
- ioreq->status = BLKIF_RSP_ERROR;
- return -1;
-}
-
-static int blk_send_response_one(struct ioreq *ioreq)
-{
- struct XenBlkDev *blkdev = ioreq->blkdev;
- int send_notify = 0;
- int have_requests = 0;
- blkif_response_t resp;
- void *dst;
-
- resp.id = ioreq->req.id;
- resp.operation = ioreq->req.operation;
- resp.status = ioreq->status;
-
- /* Place on the response ring for the relevant domain. */
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- dst = RING_GET_RESPONSE(&blkdev->rings.native, blkdev->rings.native.rsp_prod_pvt);
- break;
- case BLKIF_PROTOCOL_X86_32:
- dst = RING_GET_RESPONSE(&blkdev->rings.x86_32_part,
- blkdev->rings.x86_32_part.rsp_prod_pvt);
- break;
- case BLKIF_PROTOCOL_X86_64:
- dst = RING_GET_RESPONSE(&blkdev->rings.x86_64_part,
- blkdev->rings.x86_64_part.rsp_prod_pvt);
- break;
- default:
- dst = NULL;
- return 0;
- }
- memcpy(dst, &resp, sizeof(resp));
- blkdev->rings.common.rsp_prod_pvt++;
-
- RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blkdev->rings.common, send_notify);
- if (blkdev->rings.common.rsp_prod_pvt == blkdev->rings.common.req_cons) {
- /*
- * Tail check for pending requests. Allows frontend to avoid
- * notifications if requests are already in flight (lower
- * overheads and promotes batching).
- */
- RING_FINAL_CHECK_FOR_REQUESTS(&blkdev->rings.common, have_requests);
- } else if (RING_HAS_UNCONSUMED_REQUESTS(&blkdev->rings.common)) {
- have_requests = 1;
- }
-
- if (have_requests) {
- blkdev->more_work++;
- }
- return send_notify;
-}
-
-/* walk finished list, send outstanding responses, free requests */
-static void blk_send_response_all(struct XenBlkDev *blkdev)
-{
- struct ioreq *ioreq;
- int send_notify = 0;
-
- while (!QLIST_EMPTY(&blkdev->finished)) {
- ioreq = QLIST_FIRST(&blkdev->finished);
- send_notify += blk_send_response_one(ioreq);
- ioreq_release(ioreq, true);
- }
- if (send_notify) {
- xen_be_send_notify(&blkdev->xendev);
- }
-}
-
-static int blk_get_request(struct XenBlkDev *blkdev, struct ioreq *ioreq, RING_IDX rc)
-{
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- memcpy(&ioreq->req, RING_GET_REQUEST(&blkdev->rings.native, rc),
- sizeof(ioreq->req));
- break;
- case BLKIF_PROTOCOL_X86_32:
- blkif_get_x86_32_req(&ioreq->req,
- RING_GET_REQUEST(&blkdev->rings.x86_32_part, rc));
- break;
- case BLKIF_PROTOCOL_X86_64:
- blkif_get_x86_64_req(&ioreq->req,
- RING_GET_REQUEST(&blkdev->rings.x86_64_part, rc));
- break;
- }
- return 0;
-}
-
-static void blk_handle_requests(struct XenBlkDev *blkdev)
-{
- RING_IDX rc, rp;
- struct ioreq *ioreq;
-
- blkdev->more_work = 0;
-
- rc = blkdev->rings.common.req_cons;
- rp = blkdev->rings.common.sring->req_prod;
- xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
-
- blk_send_response_all(blkdev);
- while (rc != rp) {
- /* pull request from ring */
- if (RING_REQUEST_CONS_OVERFLOW(&blkdev->rings.common, rc)) {
- break;
- }
- ioreq = ioreq_start(blkdev);
- if (ioreq == NULL) {
- blkdev->more_work++;
- break;
- }
- blk_get_request(blkdev, ioreq, rc);
- blkdev->rings.common.req_cons = ++rc;
-
- /* parse them */
- if (ioreq_parse(ioreq) != 0) {
-
- switch (ioreq->req.operation) {
- case BLKIF_OP_READ:
- block_acct_invalid(blk_get_stats(blkdev->blk),
- BLOCK_ACCT_READ);
- break;
- case BLKIF_OP_WRITE:
- block_acct_invalid(blk_get_stats(blkdev->blk),
- BLOCK_ACCT_WRITE);
- break;
- case BLKIF_OP_FLUSH_DISKCACHE:
- block_acct_invalid(blk_get_stats(blkdev->blk),
- BLOCK_ACCT_FLUSH);
- default:
- break;
- };
-
- if (blk_send_response_one(ioreq)) {
- xen_be_send_notify(&blkdev->xendev);
- }
- ioreq_release(ioreq, false);
- continue;
- }
-
- ioreq_runio_qemu_aio(ioreq);
- }
-
- if (blkdev->more_work && blkdev->requests_inflight < max_requests) {
- qemu_bh_schedule(blkdev->bh);
- }
-}
-
-/* ------------------------------------------------------------- */
-
-static void blk_bh(void *opaque)
-{
- struct XenBlkDev *blkdev = opaque;
- blk_handle_requests(blkdev);
-}
-
-/*
- * 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 void blk_alloc(struct XenDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
-
- QLIST_INIT(&blkdev->inflight);
- QLIST_INIT(&blkdev->finished);
- QLIST_INIT(&blkdev->freelist);
- blkdev->bh = qemu_bh_new(blk_bh, blkdev);
- if (xen_mode != XEN_EMULATE) {
- batch_maps = 1;
- }
- if (xengnttab_set_max_grants(xendev->gnttabdev,
- MAX_GRANTS(max_requests, BLKIF_MAX_SEGMENTS_PER_REQUEST)) < 0) {
- xen_be_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
- strerror(errno));
- }
-}
-
-static void blk_parse_discard(struct XenBlkDev *blkdev)
-{
- int enable;
-
- blkdev->feature_discard = true;
-
- if (xenstore_read_be_int(&blkdev->xendev, "discard-enable", &enable) == 0) {
- blkdev->feature_discard = !!enable;
- }
-
- if (blkdev->feature_discard) {
- xenstore_write_be_int(&blkdev->xendev, "feature-discard", 1);
- }
-}
-
-static int blk_init(struct XenDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- int info = 0;
- char *directiosafe = NULL;
-
- /* read xenstore entries */
- if (blkdev->params == NULL) {
- char *h = NULL;
- blkdev->params = xenstore_read_be_str(&blkdev->xendev, "params");
- if (blkdev->params != NULL) {
- h = strchr(blkdev->params, ':');
- }
- if (h != NULL) {
- blkdev->fileproto = blkdev->params;
- blkdev->filename = h+1;
- *h = 0;
- } else {
- blkdev->fileproto = "<unset>";
- blkdev->filename = blkdev->params;
- }
- }
- if (!strcmp("aio", blkdev->fileproto)) {
- blkdev->fileproto = "raw";
- }
- if (!strcmp("vhd", blkdev->fileproto)) {
- blkdev->fileproto = "vpc";
- }
- if (blkdev->mode == NULL) {
- blkdev->mode = xenstore_read_be_str(&blkdev->xendev, "mode");
- }
- if (blkdev->type == NULL) {
- blkdev->type = xenstore_read_be_str(&blkdev->xendev, "type");
- }
- if (blkdev->dev == NULL) {
- blkdev->dev = xenstore_read_be_str(&blkdev->xendev, "dev");
- }
- if (blkdev->devtype == NULL) {
- blkdev->devtype = xenstore_read_be_str(&blkdev->xendev, "device-type");
- }
- directiosafe = xenstore_read_be_str(&blkdev->xendev, "direct-io-safe");
- blkdev->directiosafe = (directiosafe && atoi(directiosafe));
-
- /* do we have all we need? */
- if (blkdev->params == NULL ||
- blkdev->mode == NULL ||
- blkdev->type == NULL ||
- blkdev->dev == NULL) {
- goto out_error;
- }
-
- /* read-only ? */
- if (strcmp(blkdev->mode, "w")) {
- info |= VDISK_READONLY;
- }
-
- /* cdrom ? */
- if (blkdev->devtype && !strcmp(blkdev->devtype, "cdrom")) {
- info |= VDISK_CDROM;
- }
-
- blkdev->file_blk = BLOCK_SIZE;
-
- /* fill info
- * blk_connect supplies sector-size and sectors
- */
- xenstore_write_be_int(&blkdev->xendev, "feature-flush-cache", 1);
- xenstore_write_be_int(&blkdev->xendev, "feature-persistent", 1);
- xenstore_write_be_int(&blkdev->xendev, "info", info);
-
- blk_parse_discard(blkdev);
-
- g_free(directiosafe);
- return 0;
-
-out_error:
- g_free(blkdev->params);
- blkdev->params = NULL;
- g_free(blkdev->mode);
- blkdev->mode = NULL;
- g_free(blkdev->type);
- blkdev->type = NULL;
- g_free(blkdev->dev);
- blkdev->dev = NULL;
- g_free(blkdev->devtype);
- blkdev->devtype = NULL;
- g_free(directiosafe);
- blkdev->directiosafe = false;
- return -1;
-}
-
-static int blk_connect(struct XenDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- int pers, index, qflags;
- bool readonly = true;
- bool writethrough = true;
-
- /* read-only ? */
- if (blkdev->directiosafe) {
- qflags = BDRV_O_NOCACHE | BDRV_O_NATIVE_AIO;
- } else {
- qflags = 0;
- writethrough = false;
- }
- if (strcmp(blkdev->mode, "w") == 0) {
- qflags |= BDRV_O_RDWR;
- readonly = false;
- }
- if (blkdev->feature_discard) {
- qflags |= BDRV_O_UNMAP;
- }
-
- /* init qemu block driver */
- index = (blkdev->xendev.dev - 202 * 256) / 16;
- blkdev->dinfo = drive_get(IF_XEN, 0, index);
- if (!blkdev->dinfo) {
- Error *local_err = NULL;
- QDict *options = NULL;
-
- if (strcmp(blkdev->fileproto, "<unset>")) {
- options = qdict_new();
- qdict_put(options, "driver", qstring_from_str(blkdev->fileproto));
- }
-
- /* setup via xenbus -> create new block driver instance */
- xen_be_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n");
- blkdev->blk = blk_new_open(blkdev->filename, NULL, options,
- qflags, &local_err);
- if (!blkdev->blk) {
- xen_be_printf(&blkdev->xendev, 0, "error: %s\n",
- error_get_pretty(local_err));
- error_free(local_err);
- return -1;
- }
- blk_set_enable_write_cache(blkdev->blk, !writethrough);
- } else {
- /* setup via qemu cmdline -> already setup for us */
- xen_be_printf(&blkdev->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_be_printf(&blkdev->xendev, 0, "Unexpected read-only drive");
- blkdev->blk = NULL;
- return -1;
- }
- /* blkdev->blk is not create by us, we get a reference
- * so we can blk_unref() unconditionally */
- blk_ref(blkdev->blk);
- }
- blk_attach_dev_nofail(blkdev->blk, blkdev);
- blkdev->file_size = blk_getlength(blkdev->blk);
- if (blkdev->file_size < 0) {
- BlockDriverState *bs = blk_bs(blkdev->blk);
- const char *drv_name = bs ? bdrv_get_format_name(bs) : NULL;
- xen_be_printf(&blkdev->xendev, 1, "blk_getlength: %d (%s) | drv %s\n",
- (int)blkdev->file_size, strerror(-blkdev->file_size),
- drv_name ?: "-");
- blkdev->file_size = 0;
- }
-
- xen_be_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\","
- " size %" PRId64 " (%" PRId64 " MB)\n",
- blkdev->type, blkdev->fileproto, blkdev->filename,
- blkdev->file_size, blkdev->file_size >> 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",
- blkdev->file_size / blkdev->file_blk);
-
- if (xenstore_read_fe_int(&blkdev->xendev, "ring-ref", &blkdev->ring_ref) == -1) {
- return -1;
- }
- if (xenstore_read_fe_int(&blkdev->xendev, "event-channel",
- &blkdev->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;
- }
-
- blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
- if (blkdev->xendev.protocol) {
- if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_X86_32;
- }
- if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_X86_64;
- }
- }
-
- blkdev->sring = xengnttab_map_grant_ref(blkdev->xendev.gnttabdev,
- blkdev->xendev.dom,
- blkdev->ring_ref,
- PROT_READ | PROT_WRITE);
- if (!blkdev->sring) {
- return -1;
- }
- blkdev->cnt_map++;
-
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- {
- blkif_sring_t *sring_native = blkdev->sring;
- BACK_RING_INIT(&blkdev->rings.native, sring_native, XC_PAGE_SIZE);
- break;
- }
- case BLKIF_PROTOCOL_X86_32:
- {
- blkif_x86_32_sring_t *sring_x86_32 = blkdev->sring;
-
- BACK_RING_INIT(&blkdev->rings.x86_32_part, sring_x86_32, XC_PAGE_SIZE);
- break;
- }
- case BLKIF_PROTOCOL_X86_64:
- {
- blkif_x86_64_sring_t *sring_x86_64 = blkdev->sring;
-
- BACK_RING_INIT(&blkdev->rings.x86_64_part, sring_x86_64, XC_PAGE_SIZE);
- break;
- }
- }
-
- if (blkdev->feature_persistent) {
- /* Init persistent grants */
- blkdev->max_grants = 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;
- }
-
- xen_be_bind_evtchn(&blkdev->xendev);
-
- xen_be_printf(&blkdev->xendev, 1, "ok: proto %s, ring-ref %d, "
- "remote port %d, local port %d\n",
- blkdev->xendev.protocol, blkdev->ring_ref,
- blkdev->xendev.remote_port, blkdev->xendev.local_port);
- return 0;
-}
-
-static void blk_disconnect(struct XenDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
-
- if (blkdev->blk) {
- blk_detach_dev(blkdev->blk, blkdev);
- blk_unref(blkdev->blk);
- blkdev->blk = NULL;
- }
- xen_be_unbind_evtchn(&blkdev->xendev);
-
- if (blkdev->sring) {
- xengnttab_unmap(blkdev->xendev.gnttabdev, blkdev->sring, 1);
- blkdev->cnt_map--;
- 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;
- }
-}
-
-static int blk_free(struct XenDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- struct ioreq *ioreq;
-
- if (blkdev->blk || blkdev->sring) {
- blk_disconnect(xendev);
- }
-
- while (!QLIST_EMPTY(&blkdev->freelist)) {
- ioreq = QLIST_FIRST(&blkdev->freelist);
- QLIST_REMOVE(ioreq, list);
- qemu_iovec_destroy(&ioreq->v);
- g_free(ioreq);
- }
-
- g_free(blkdev->params);
- g_free(blkdev->mode);
- g_free(blkdev->type);
- g_free(blkdev->dev);
- g_free(blkdev->devtype);
- qemu_bh_delete(blkdev->bh);
- return 0;
-}
-
-static void blk_event(struct XenDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
-
- qemu_bh_schedule(blkdev->bh);
-}
-
-struct XenDevOps xen_blkdev_ops = {
- .size = sizeof(struct XenBlkDev),
- .flags = DEVOPS_FLAG_NEED_GNTDEV,
- .alloc = blk_alloc,
- .init = blk_init,
- .initialise = blk_connect,
- .disconnect = blk_disconnect,
- .event = blk_event,
- .free = blk_free,
-};