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xen_disk: remove open-coded use of libxengnttab

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Now that helpers are present in xen_backend, this patch removes open-coded
calls to libxengnttab from the xen_disk code.

This patch also fixes one whitspace error in the assignment of the
XenDevOps initialise method.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Paul Durrant 2018-05-17 16:35:52 +01:00 committed by Stefano Stabellini
parent 9838824aff
commit 5ee1d99913
1 changed files with 32 additions and 90 deletions
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122
hw/block/xen_disk.c
View file

@ -68,7 +68,6 @@ struct ioreq {
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];
@ -142,7 +141,6 @@ static void ioreq_reset(struct ioreq *ioreq)
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));
@ -168,16 +166,12 @@ static gint int_cmp(gconstpointer a, gconstpointer b, gpointer user_data)
static void destroy_grant(gpointer pgnt)
{
PersistentGrant *grant = pgnt;
xengnttab_handle *gnt = grant->blkdev->xendev.gnttabdev;
struct XenBlkDev *blkdev = grant->blkdev;
struct XenDevice *xendev = &blkdev->xendev;
if (xengnttab_unmap(gnt, grant->page, 1) != 0) {
xen_pv_printf(&grant->blkdev->xendev, 0,
"xengnttab_unmap failed: %s\n",
strerror(errno));
}
xen_be_unmap_grant_ref(xendev, grant->page);
grant->blkdev->persistent_gnt_count--;
xen_pv_printf(&grant->blkdev->xendev, 3,
"unmapped grant %p\n", grant->page);
xen_pv_printf(xendev, 3, "unmapped grant %p\n", grant->page);
g_free(grant);
}
@ -185,15 +179,10 @@ static void remove_persistent_region(gpointer data, gpointer dev)
{
PersistentRegion *region = data;
struct XenBlkDev *blkdev = dev;
xengnttab_handle *gnt = blkdev->xendev.gnttabdev;
struct XenDevice *xendev = &blkdev->xendev;
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",
xen_be_unmap_grant_refs(xendev, region->addr, region->num);
xen_pv_printf(xendev, 3, "unmapped grant region %p with %d pages\n",
region->addr, region->num);
g_free(region);
}
@ -304,7 +293,6 @@ static int ioreq_parse(struct ioreq *ioreq)
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;
@ -324,7 +312,8 @@ err:
static void ioreq_unmap(struct ioreq *ioreq)
{
xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev;
struct XenBlkDev *blkdev = ioreq->blkdev;
struct XenDevice *xendev = &blkdev->xendev;
int i;
if (ioreq->num_unmap == 0 || ioreq->mapped == 0) {
@ -334,11 +323,7 @@ static void ioreq_unmap(struct ioreq *ioreq)
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));
}
xen_be_unmap_grant_refs(xendev, ioreq->pages, ioreq->num_unmap);
ioreq->blkdev->cnt_map -= ioreq->num_unmap;
ioreq->pages = NULL;
} else {
@ -346,11 +331,7 @@ static void ioreq_unmap(struct ioreq *ioreq)
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));
}
xen_be_unmap_grant_ref(xendev, ioreq->page[i]);
ioreq->blkdev->cnt_map--;
ioreq->page[i] = NULL;
}
@ -360,14 +341,14 @@ static void ioreq_unmap(struct ioreq *ioreq)
static int ioreq_map(struct ioreq *ioreq)
{
xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev;
uint32_t domids[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct XenBlkDev *blkdev = ioreq->blkdev;
struct XenDevice *xendev = &blkdev->xendev;
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
/* refs variable 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
@ -392,7 +373,6 @@ static int ioreq_map(struct ioreq *ioreq)
/* 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++;
@ -405,14 +385,13 @@ static int ioreq_map(struct ioreq *ioreq)
} 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);
ioreq->pages = xen_be_map_grant_refs(xendev, refs, new_maps,
ioreq->prot);
if (ioreq->pages == NULL) {
xen_pv_printf(&ioreq->blkdev->xendev, 0,
"can't map %d grant refs (%s, %d maps)\n",
@ -427,8 +406,8 @@ static int ioreq_map(struct ioreq *ioreq)
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);
ioreq->page[i] = xen_be_map_grant_ref(xendev, 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",
@ -527,10 +506,12 @@ static int ioreq_init_copy_buffers(struct ioreq *ioreq)
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;
bool to_domain = (ioreq->req.operation == BLKIF_OP_READ);
if (ioreq->v.niov == 0) {
return 0;
@ -539,16 +520,12 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
count = ioreq->v.niov;
for (i = 0; i < count; i++) {
if (ioreq->req.operation == BLKIF_OP_READ) {
segs[i].flags = GNTCOPY_dest_gref;
if (to_domain) {
segs[i].dest.foreign.ref = ioreq->refs[i];
segs[i].dest.foreign.domid = ioreq->domids[i];
segs[i].dest.foreign.offset = ioreq->req.seg[i].first_sect * file_blk;
segs[i].source.virt = ioreq->v.iov[i].iov_base;
} 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.offset = ioreq->req.seg[i].first_sect * file_blk;
segs[i].dest.virt = ioreq->v.iov[i].iov_base;
}
@ -556,7 +533,7 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
- ioreq->req.seg[i].first_sect + 1) * file_blk;
}
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,
@ -565,16 +542,6 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
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;
}
@ -1067,7 +1034,6 @@ static int blk_connect(struct XenDevice *xendev)
int order, ring_ref;
unsigned int ring_size, max_grants;
unsigned int i;
uint32_t *domids;
trace_xen_disk_connect(xendev->name);
@ -1229,31 +1195,11 @@ static int blk_connect(struct XenDevice *xendev)
/* 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);
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;
}
@ -1326,8 +1272,8 @@ static void blk_disconnect(struct XenDevice *xendev)
aio_context_release(blkdev->ctx);
if (blkdev->sring) {
xengnttab_unmap(blkdev->xendev.gnttabdev, blkdev->sring,
blkdev->nr_ring_ref);
xen_be_unmap_grant_refs(xendev, blkdev->sring,
blkdev->nr_ring_ref);
blkdev->cnt_map--;
blkdev->sring = NULL;
}
@ -1351,11 +1297,6 @@ static void blk_disconnect(struct XenDevice *xendev)
}
blkdev->feature_persistent = false;
}
if (blkdev->xendev.gnttabdev) {
xengnttab_close(blkdev->xendev.gnttabdev);
blkdev->xendev.gnttabdev = NULL;
}
}
static int blk_free(struct XenDevice *xendev)
@ -1392,10 +1333,11 @@ 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,