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-rw-r--r--drivers/block/xen-blkback/xenbus.c36
-rw-r--r--drivers/block/xen-blkfront.c81
-rw-r--r--drivers/char/tpm/xen-tpmfront.c8
-rw-r--r--drivers/input/misc/xen-kbdfront.c13
-rw-r--r--drivers/net/xen-netback/xenbus.c52
-rw-r--r--drivers/net/xen-netfront.c67
-rw-r--r--drivers/pci/xen-pcifront.c6
-rw-r--r--drivers/scsi/xen-scsifront.c193
-rw-r--r--drivers/video/fbdev/xen-fbfront.c13
-rw-r--r--drivers/xen/balloon.c6
-rw-r--r--drivers/xen/events/events_base.c2
-rw-r--r--drivers/xen/gntalloc.c9
-rw-r--r--drivers/xen/gntdev.c2
-rw-r--r--drivers/xen/platform-pci.c6
-rw-r--r--drivers/xen/xen-pciback/xenbus.c8
-rw-r--r--drivers/xen/xenbus/xenbus_dev_frontend.c2
-rw-r--r--drivers/xen/xenbus/xenbus_probe.c4
-rw-r--r--drivers/xen/xenbus/xenbus_probe_backend.c8
-rw-r--r--drivers/xen/xenbus/xenbus_xs.c22
19 files changed, 207 insertions, 331 deletions
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 3cc6d1d86f1e..415e79b69d34 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -533,13 +533,11 @@ static void xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info
struct xenbus_device *dev = be->dev;
struct xen_blkif *blkif = be->blkif;
int err;
- int state = 0, discard_enable;
+ int state = 0;
struct block_device *bdev = be->blkif->vbd.bdev;
struct request_queue *q = bdev_get_queue(bdev);
- err = xenbus_scanf(XBT_NIL, dev->nodename, "discard-enable", "%d",
- &discard_enable);
- if (err == 1 && !discard_enable)
+ if (!xenbus_read_unsigned(dev->nodename, "discard-enable", 1))
return;
if (blk_queue_discard(q)) {
@@ -1039,30 +1037,24 @@ static int connect_ring(struct backend_info *be)
xenbus_dev_fatal(dev, err, "unknown fe protocol %s", protocol);
return -ENOSYS;
}
- err = xenbus_scanf(XBT_NIL, dev->otherend,
- "feature-persistent", "%u", &pers_grants);
- if (err <= 0)
- pers_grants = 0;
-
+ pers_grants = xenbus_read_unsigned(dev->otherend, "feature-persistent",
+ 0);
be->blkif->vbd.feature_gnt_persistent = pers_grants;
be->blkif->vbd.overflow_max_grants = 0;
/*
* Read the number of hardware queues from frontend.
*/
- err = xenbus_scanf(XBT_NIL, dev->otherend, "multi-queue-num-queues",
- "%u", &requested_num_queues);
- if (err < 0) {
- requested_num_queues = 1;
- } else {
- if (requested_num_queues > xenblk_max_queues
- || requested_num_queues == 0) {
- /* Buggy or malicious guest. */
- xenbus_dev_fatal(dev, err,
- "guest requested %u queues, exceeding the maximum of %u.",
- requested_num_queues, xenblk_max_queues);
- return -ENOSYS;
- }
+ requested_num_queues = xenbus_read_unsigned(dev->otherend,
+ "multi-queue-num-queues",
+ 1);
+ if (requested_num_queues > xenblk_max_queues
+ || requested_num_queues == 0) {
+ /* Buggy or malicious guest. */
+ xenbus_dev_fatal(dev, err,
+ "guest requested %u queues, exceeding the maximum of %u.",
+ requested_num_queues, xenblk_max_queues);
+ return -ENOSYS;
}
be->blkif->nr_rings = requested_num_queues;
if (xen_blkif_alloc_rings(be->blkif))
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index c000fdf048b2..b2bdfa81f929 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1758,17 +1758,13 @@ static int talk_to_blkback(struct xenbus_device *dev,
const char *message = NULL;
struct xenbus_transaction xbt;
int err;
- unsigned int i, max_page_order = 0;
- unsigned int ring_page_order = 0;
+ unsigned int i, max_page_order;
+ unsigned int ring_page_order;
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "max-ring-page-order", "%u", &max_page_order);
- if (err != 1)
- info->nr_ring_pages = 1;
- else {
- ring_page_order = min(xen_blkif_max_ring_order, max_page_order);
- info->nr_ring_pages = 1 << ring_page_order;
- }
+ max_page_order = xenbus_read_unsigned(info->xbdev->otherend,
+ "max-ring-page-order", 0);
+ ring_page_order = min(xen_blkif_max_ring_order, max_page_order);
+ info->nr_ring_pages = 1 << ring_page_order;
for (i = 0; i < info->nr_rings; i++) {
struct blkfront_ring_info *rinfo = &info->rinfo[i];
@@ -1877,18 +1873,14 @@ again:
static int negotiate_mq(struct blkfront_info *info)
{
- unsigned int backend_max_queues = 0;
- int err;
+ unsigned int backend_max_queues;
unsigned int i;
BUG_ON(info->nr_rings);
/* Check if backend supports multiple queues. */
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "multi-queue-max-queues", "%u", &backend_max_queues);
- if (err < 0)
- backend_max_queues = 1;
-
+ backend_max_queues = xenbus_read_unsigned(info->xbdev->otherend,
+ "multi-queue-max-queues", 1);
info->nr_rings = min(backend_max_queues, xen_blkif_max_queues);
/* We need at least one ring. */
if (!info->nr_rings)
@@ -2196,7 +2188,6 @@ static void blkfront_setup_discard(struct blkfront_info *info)
int err;
unsigned int discard_granularity;
unsigned int discard_alignment;
- unsigned int discard_secure;
info->feature_discard = 1;
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
@@ -2207,10 +2198,9 @@ static void blkfront_setup_discard(struct blkfront_info *info)
info->discard_granularity = discard_granularity;
info->discard_alignment = discard_alignment;
}
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "discard-secure", "%u", &discard_secure);
- if (err > 0)
- info->feature_secdiscard = !!discard_secure;
+ info->feature_secdiscard =
+ !!xenbus_read_unsigned(info->xbdev->otherend, "discard-secure",
+ 0);
}
static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo)
@@ -2302,16 +2292,11 @@ out_of_memory:
*/
static void blkfront_gather_backend_features(struct blkfront_info *info)
{
- int err;
- int barrier, flush, discard, persistent;
unsigned int indirect_segments;
info->feature_flush = 0;
info->feature_fua = 0;
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "feature-barrier", "%d", &barrier);
-
/*
* If there's no "feature-barrier" defined, then it means
* we're dealing with a very old backend which writes
@@ -2319,7 +2304,7 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
*
* If there are barriers, then we use flush.
*/
- if (err > 0 && barrier) {
+ if (xenbus_read_unsigned(info->xbdev->otherend, "feature-barrier", 0)) {
info->feature_flush = 1;
info->feature_fua = 1;
}
@@ -2328,35 +2313,23 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
* And if there is "feature-flush-cache" use that above
* barriers.
*/
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "feature-flush-cache", "%d", &flush);
-
- if (err > 0 && flush) {
+ if (xenbus_read_unsigned(info->xbdev->otherend, "feature-flush-cache",
+ 0)) {
info->feature_flush = 1;
info->feature_fua = 0;
}
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "feature-discard", "%d", &discard);
-
- if (err > 0 && discard)
+ if (xenbus_read_unsigned(info->xbdev->otherend, "feature-discard", 0))
blkfront_setup_discard(info);
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "feature-persistent", "%d", &persistent);
- if (err <= 0)
- info->feature_persistent = 0;
- else
- info->feature_persistent = persistent;
+ info->feature_persistent =
+ xenbus_read_unsigned(info->xbdev->otherend,
+ "feature-persistent", 0);
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "feature-max-indirect-segments", "%u",
- &indirect_segments);
- if (err <= 0)
- info->max_indirect_segments = 0;
- else
- info->max_indirect_segments = min(indirect_segments,
- xen_blkif_max_segments);
+ indirect_segments = xenbus_read_unsigned(info->xbdev->otherend,
+ "feature-max-indirect-segments", 0);
+ info->max_indirect_segments = min(indirect_segments,
+ xen_blkif_max_segments);
}
/*
@@ -2421,11 +2394,9 @@ static void blkfront_connect(struct blkfront_info *info)
* provide this. Assume physical sector size to be the same as
* sector_size in that case.
*/
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "physical-sector-size", "%u", &physical_sector_size);
- if (err != 1)
- physical_sector_size = sector_size;
-
+ physical_sector_size = xenbus_read_unsigned(info->xbdev->otherend,
+ "physical-sector-size",
+ sector_size);
blkfront_gather_backend_features(info);
for (i = 0; i < info->nr_rings; i++) {
err = blkfront_setup_indirect(&info->rinfo[i]);
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
index 62028f483bba..50072cc4fe5c 100644
--- a/drivers/char/tpm/xen-tpmfront.c
+++ b/drivers/char/tpm/xen-tpmfront.c
@@ -337,18 +337,14 @@ static int tpmfront_resume(struct xenbus_device *dev)
static void backend_changed(struct xenbus_device *dev,
enum xenbus_state backend_state)
{
- int val;
-
switch (backend_state) {
case XenbusStateInitialised:
case XenbusStateConnected:
if (dev->state == XenbusStateConnected)
break;
- if (xenbus_scanf(XBT_NIL, dev->otherend,
- "feature-protocol-v2", "%d", &val) < 0)
- val = 0;
- if (!val) {
+ if (!xenbus_read_unsigned(dev->otherend, "feature-protocol-v2",
+ 0)) {
xenbus_dev_fatal(dev, -EINVAL,
"vTPM protocol 2 required");
return;
diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
index 227fbd2dbb71..3900875dec10 100644
--- a/drivers/input/misc/xen-kbdfront.c
+++ b/drivers/input/misc/xen-kbdfront.c
@@ -108,7 +108,8 @@ static irqreturn_t input_handler(int rq, void *dev_id)
static int xenkbd_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
- int ret, i, abs;
+ int ret, i;
+ unsigned int abs;
struct xenkbd_info *info;
struct input_dev *kbd, *ptr;
@@ -127,8 +128,7 @@ static int xenkbd_probe(struct xenbus_device *dev,
if (!info->page)
goto error_nomem;
- if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0)
- abs = 0;
+ abs = xenbus_read_unsigned(dev->otherend, "feature-abs-pointer", 0);
if (abs) {
ret = xenbus_write(XBT_NIL, dev->nodename,
"request-abs-pointer", "1");
@@ -322,11 +322,8 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
case XenbusStateInitWait:
InitWait:
- ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "feature-abs-pointer", "%d", &val);
- if (ret < 0)
- val = 0;
- if (val) {
+ if (xenbus_read_unsigned(info->xbdev->otherend,
+ "feature-abs-pointer", 0)) {
ret = xenbus_write(XBT_NIL, info->xbdev->nodename,
"request-abs-pointer", "1");
if (ret)
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 55a4488633e4..3124eaec9427 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -785,12 +785,9 @@ static void xen_mcast_ctrl_changed(struct xenbus_watch *watch,
struct xenvif *vif = container_of(watch, struct xenvif,
mcast_ctrl_watch);
struct xenbus_device *dev = xenvif_to_xenbus_device(vif);
- int val;
- if (xenbus_scanf(XBT_NIL, dev->otherend,
- "request-multicast-control", "%d", &val) < 0)
- val = 0;
- vif->multicast_control = !!val;
+ vif->multicast_control = !!xenbus_read_unsigned(dev->otherend,
+ "request-multicast-control", 0);
}
static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev,
@@ -934,14 +931,11 @@ static void connect(struct backend_info *be)
/* Check whether the frontend requested multiple queues
* and read the number requested.
*/
- err = xenbus_scanf(XBT_NIL, dev->otherend,
- "multi-queue-num-queues",
- "%u", &requested_num_queues);
- if (err < 0) {
- requested_num_queues = 1; /* Fall back to single queue */
- } else if (requested_num_queues > xenvif_max_queues) {
+ requested_num_queues = xenbus_read_unsigned(dev->otherend,
+ "multi-queue-num-queues", 1);
+ if (requested_num_queues > xenvif_max_queues) {
/* buggy or malicious guest */
- xenbus_dev_fatal(dev, err,
+ xenbus_dev_fatal(dev, -EINVAL,
"guest requested %u queues, exceeding the maximum of %u.",
requested_num_queues, xenvif_max_queues);
return;
@@ -1134,7 +1128,7 @@ static int read_xenbus_vif_flags(struct backend_info *be)
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned int rx_copy;
- int err, val;
+ int err;
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
@@ -1150,10 +1144,7 @@ static int read_xenbus_vif_flags(struct backend_info *be)
if (!rx_copy)
return -EOPNOTSUPP;
- if (xenbus_scanf(XBT_NIL, dev->otherend,
- "feature-rx-notify", "%d", &val) < 0)
- val = 0;
- if (!val) {
+ if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) {
/* - Reduce drain timeout to poll more frequently for
* Rx requests.
* - Disable Rx stall detection.
@@ -1162,34 +1153,21 @@ static int read_xenbus_vif_flags(struct backend_info *be)
be->vif->stall_timeout = 0;
}
- if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
- "%d", &val) < 0)
- val = 0;
- vif->can_sg = !!val;
+ vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0);
vif->gso_mask = 0;
- if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
- "%d", &val) < 0)
- val = 0;
- if (val)
+ if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0))
vif->gso_mask |= GSO_BIT(TCPV4);
- if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6",
- "%d", &val) < 0)
- val = 0;
- if (val)
+ if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0))
vif->gso_mask |= GSO_BIT(TCPV6);
- if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
- "%d", &val) < 0)
- val = 0;
- vif->ip_csum = !val;
+ vif->ip_csum = !xenbus_read_unsigned(dev->otherend,
+ "feature-no-csum-offload", 0);
- if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
- "%d", &val) < 0)
- val = 0;
- vif->ipv6_csum = !!val;
+ vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend,
+ "feature-ipv6-csum-offload", 0);
return 0;
}
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index e085c8c31cfe..a479cd99911d 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1169,43 +1169,23 @@ static netdev_features_t xennet_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct netfront_info *np = netdev_priv(dev);
- int val;
- if (features & NETIF_F_SG) {
- if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
- "%d", &val) < 0)
- val = 0;
+ if (features & NETIF_F_SG &&
+ !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0))
+ features &= ~NETIF_F_SG;
- if (!val)
- features &= ~NETIF_F_SG;
- }
-
- if (features & NETIF_F_IPV6_CSUM) {
- if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
- "feature-ipv6-csum-offload", "%d", &val) < 0)
- val = 0;
-
- if (!val)
- features &= ~NETIF_F_IPV6_CSUM;
- }
-
- if (features & NETIF_F_TSO) {
- if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
- "feature-gso-tcpv4", "%d", &val) < 0)
- val = 0;
+ if (features & NETIF_F_IPV6_CSUM &&
+ !xenbus_read_unsigned(np->xbdev->otherend,
+ "feature-ipv6-csum-offload", 0))
+ features &= ~NETIF_F_IPV6_CSUM;
- if (!val)
- features &= ~NETIF_F_TSO;
- }
+ if (features & NETIF_F_TSO &&
+ !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0))
+ features &= ~NETIF_F_TSO;
- if (features & NETIF_F_TSO6) {
- if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
- "feature-gso-tcpv6", "%d", &val) < 0)
- val = 0;
-
- if (!val)
- features &= ~NETIF_F_TSO6;
- }
+ if (features & NETIF_F_TSO6 &&
+ !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0))
+ features &= ~NETIF_F_TSO6;
return features;
}
@@ -1823,18 +1803,13 @@ static int talk_to_netback(struct xenbus_device *dev,
info->netdev->irq = 0;
/* Check if backend supports multiple queues */
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "multi-queue-max-queues", "%u", &max_queues);
- if (err < 0)
- max_queues = 1;
+ max_queues = xenbus_read_unsigned(info->xbdev->otherend,
+ "multi-queue-max-queues", 1);
num_queues = min(max_queues, xennet_max_queues);
/* Check feature-split-event-channels */
- err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "feature-split-event-channels", "%u",
- &feature_split_evtchn);
- if (err < 0)
- feature_split_evtchn = 0;
+ feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend,
+ "feature-split-event-channels", 0);
/* Read mac addr. */
err = xen_net_read_mac(dev, info->netdev->dev_addr);
@@ -1968,16 +1943,10 @@ static int xennet_connect(struct net_device *dev)
struct netfront_info *np = netdev_priv(dev);
unsigned int num_queues = 0;
int err;
- unsigned int feature_rx_copy;
unsigned int j = 0;
struct netfront_queue *queue = NULL;
- err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
- "feature-rx-copy", "%u", &feature_rx_copy);
- if (err != 1)
- feature_rx_copy = 0;
-
- if (!feature_rx_copy) {
+ if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) {
dev_info(&dev->dev,
"backend does not support copying receive path\n");
return -ENODEV;
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index d6ff5e82377d..8fc2e9532575 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -1038,10 +1038,8 @@ static int pcifront_detach_devices(struct pcifront_device *pdev)
err = -ENOMEM;
goto out;
}
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d",
- &state);
- if (err != 1)
- state = XenbusStateUnknown;
+ state = xenbus_read_unsigned(pdev->xdev->otherend, str,
+ XenbusStateUnknown);
if (state != XenbusStateClosing)
continue;
diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
index 9dc8687bf048..9aa1fe1fc939 100644
--- a/drivers/scsi/xen-scsifront.c
+++ b/drivers/scsi/xen-scsifront.c
@@ -79,10 +79,13 @@
struct vscsifrnt_shadow {
/* command between backend and frontend */
unsigned char act;
+ uint8_t nr_segments;
uint16_t rqid;
+ uint16_t ref_rqid;
unsigned int nr_grants; /* number of grants in gref[] */
struct scsiif_request_segment *sg; /* scatter/gather elements */
+ struct scsiif_request_segment seg[VSCSIIF_SG_TABLESIZE];
/* Do reset or abort function. */
wait_queue_head_t wq_reset; /* reset work queue */
@@ -172,68 +175,90 @@ static void scsifront_put_rqid(struct vscsifrnt_info *info, uint32_t id)
scsifront_wake_up(info);
}
-static struct vscsiif_request *scsifront_pre_req(struct vscsifrnt_info *info)
+static int scsifront_do_request(struct vscsifrnt_info *info,
+ struct vscsifrnt_shadow *shadow)
{
struct vscsiif_front_ring *ring = &(info->ring);
struct vscsiif_request *ring_req;
+ struct scsi_cmnd *sc = shadow->sc;
uint32_t id;
+ int i, notify;
+
+ if (RING_FULL(&info->ring))
+ return -EBUSY;
id = scsifront_get_rqid(info); /* use id in response */
if (id >= VSCSIIF_MAX_REQS)
- return NULL;
+ return -EBUSY;
- ring_req = RING_GET_REQUEST(&(info->ring), ring->req_prod_pvt);
+ info->shadow[id] = shadow;
+ shadow->rqid = id;
+ ring_req = RING_GET_REQUEST(&(info->ring), ring->req_prod_pvt);
ring->req_prod_pvt++;
- ring_req->rqid = (uint16_t)id;
+ ring_req->rqid = id;
+ ring_req->act = shadow->act;
+ ring_req->ref_rqid = shadow->ref_rqid;
+ ring_req->nr_segments = shadow->nr_segments;
- return ring_req;
-}
+ ring_req->id = sc->device->id;
+ ring_req->lun = sc->device->lun;
+ ring_req->channel = sc->device->channel;
+ ring_req->cmd_len = sc->cmd_len;
-static void scsifront_do_request(struct vscsifrnt_info *info)
-{
- struct vscsiif_front_ring *ring = &(info->ring);
- int notify;
+ BUG_ON(sc->cmd_len > VSCSIIF_MAX_COMMAND_SIZE);
+
+ memcpy(ring_req->cmnd, sc->cmnd, sc->cmd_len);
+
+ ring_req->sc_data_direction = (uint8_t)sc->sc_data_direction;
+ ring_req->timeout_per_command = sc->request->timeout / HZ;
+
+ for (i = 0; i < (shadow->nr_segments & ~VSCSIIF_SG_GRANT); i++)
+ ring_req->seg[i] = shadow->seg[i];
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(ring, notify);
if (notify)
notify_remote_via_irq(info->irq);
+
+ return 0;
}
-static void scsifront_gnttab_done(struct vscsifrnt_info *info, uint32_t id)
+static void scsifront_gnttab_done(struct vscsifrnt_info *info,
+ struct vscsifrnt_shadow *shadow)
{
- struct vscsifrnt_shadow *s = info->shadow[id];
int i;
- if (s->sc->sc_data_direction == DMA_NONE)
+ if (shadow->sc->sc_data_direction == DMA_NONE)
return;
- for (i = 0; i < s->nr_grants; i++) {
- if (unlikely(gnttab_query_foreign_access(s->gref[i]) != 0)) {
+ for (i = 0; i < shadow->nr_grants; i++) {
+ if (unlikely(gnttab_query_foreign_access(shadow->gref[i]))) {
shost_printk(KERN_ALERT, info->host, KBUILD_MODNAME
"grant still in use by backend\n");
BUG();
}
- gnttab_end_foreign_access(s->gref[i], 0, 0UL);
+ gnttab_end_foreign_access(shadow->gref[i], 0, 0UL);
}
- kfree(s->sg);
+ kfree(shadow->sg);
}
static void scsifront_cdb_cmd_done(struct vscsifrnt_info *info,
struct vscsiif_response *ring_rsp)
{
+ struct vscsifrnt_shadow *shadow;
struct scsi_cmnd *sc;
uint32_t id;
uint8_t sense_len;
id = ring_rsp->rqid;
- sc = info->shadow[id]->sc;
+ shadow = info->shadow[id];
+ sc = shadow->sc;
BUG_ON(sc == NULL);
- scsifront_gnttab_done(info, id);
+ scsifront_gnttab_done(info, shadow);
scsifront_put_rqid(info, id);
sc->result = ring_rsp->rslt;
@@ -366,7 +391,6 @@ static void scsifront_finish_all(struct vscsifrnt_info *info)
static int map_data_for_request(struct vscsifrnt_info *info,
struct scsi_cmnd *sc,
- struct vscsiif_request *ring_req,
struct vscsifrnt_shadow *shadow)
{
grant_ref_t gref_head;
@@ -379,7 +403,6 @@ static int map_data_for_request(struct vscsifrnt_info *info,
struct scatterlist *sg;
struct scsiif_request_segment *seg;
- ring_req->nr_segments = 0;
if (sc->sc_data_direction == DMA_NONE || !data_len)
return 0;
@@ -398,7 +421,7 @@ static int map_data_for_request(struct vscsifrnt_info *info,
if (!shadow->sg)
return -ENOMEM;
}
- seg = shadow->sg ? : ring_req->seg;
+ seg = shadow->sg ? : shadow->seg;
err = gnttab_alloc_grant_references(seg_grants + data_grants,
&gref_head);
@@ -423,9 +446,9 @@ static int map_data_for_request(struct vscsifrnt_info *info,
info->dev->otherend_id,
xen_page_to_gfn(page), 1);
shadow->gref[ref_cnt] = ref;
- ring_req->seg[ref_cnt].gref = ref;
- ring_req->seg[ref_cnt].offset = (uint16_t)off;
- ring_req->seg[ref_cnt].length = (uint16_t)bytes;
+ shadow->seg[ref_cnt].gref = ref;
+ shadow->seg[ref_cnt].offset = (uint16_t)off;
+ shadow->seg[ref_cnt].length = (uint16_t)bytes;
page++;
len -= bytes;
@@ -473,44 +496,14 @@ static int map_data_for_request(struct vscsifrnt_info *info,
}
if (seg_grants)
- ring_req->nr_segments = VSCSIIF_SG_GRANT | seg_grants;
+ shadow->nr_segments = VSCSIIF_SG_GRANT | seg_grants;
else
- ring_req->nr_segments = (uint8_t)ref_cnt;
+ shadow->nr_segments = (uint8_t)ref_cnt;
shadow->nr_grants = ref_cnt;
return 0;
}
-static struct vscsiif_request *scsifront_command2ring(
- struct vscsifrnt_info *info, struct scsi_cmnd *sc,
- struct vscsifrnt_shadow *shadow)
-{
- struct vscsiif_request *ring_req;
-
- memset(shadow, 0, sizeof(*shadow));
-
- ring_req = scsifront_pre_req(info);
- if (!ring_req)
- return NULL;
-
- info->shadow[ring_req->rqid] = shadow;
- shadow->rqid = ring_req->rqid;
-
- ring_req->id = sc->device->id;
- ring_req->lun = sc->device->lun;
- ring_req->channel = sc->device->channel;
- ring_req->cmd_len = sc->cmd_len;
-
- BUG_ON(sc->cmd_len > VSCSIIF_MAX_COMMAND_SIZE);
-
- memcpy(ring_req->cmnd, sc->cmnd, sc->cmd_len);
-
- ring_req->sc_data_direction = (uint8_t)sc->sc_data_direction;
- ring_req->timeout_per_command = sc->request->timeout / HZ;
-
- return ring_req;
-}
-
static int scsifront_enter(struct vscsifrnt_info *info)
{
if (info->pause)
@@ -536,36 +529,25 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
struct scsi_cmnd *sc)
{
struct vscsifrnt_info *info = shost_priv(shost);
- struct vscsiif_request *ring_req;
struct vscsifrnt_shadow *shadow = scsi_cmd_priv(sc);
unsigned long flags;
int err;
- uint16_t rqid;
+
+ sc->result = 0;
+ memset(shadow, 0, sizeof(*shadow));
+
+ shadow->sc = sc;
+ shadow->act = VSCSIIF_ACT_SCSI_CDB;
spin_lock_irqsave(shost->host_lock, flags);
if (scsifront_enter(info)) {
spin_unlock_irqrestore(shost->host_lock, flags);
return SCSI_MLQUEUE_HOST_BUSY;
}
- if (RING_FULL(&info->ring))
- goto busy;
-
- ring_req = scsifront_command2ring(info, sc, shadow);
- if (!ring_req)
- goto busy;
-
- sc->result = 0;
-
- rqid = ring_req->rqid;
- ring_req->act = VSCSIIF_ACT_SCSI_CDB;
- shadow->sc = sc;
- shadow->act = VSCSIIF_ACT_SCSI_CDB;
-
- err = map_data_for_request(info, sc, ring_req, shadow);
+ err = map_data_for_request(info, sc, shadow);
if (err < 0) {
pr_debug("%s: err %d\n", __func__, err);
- scsifront_put_rqid(info, rqid);
scsifront_return(info);
spin_unlock_irqrestore(shost->host_lock, flags);
if (err == -ENOMEM)
@@ -575,7 +557,11 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
return 0;
}
- scsifront_do_request(info);
+ if (scsifront_do_request(info, shadow)) {
+ scsifront_gnttab_done(info, shadow);
+ goto busy;
+ }
+
scsifront_return(info);
spin_unlock_irqrestore(shost->host_lock, flags);
@@ -598,26 +584,30 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
struct Scsi_Host *host = sc->device->host;
struct vscsifrnt_info *info = shost_priv(host);
struct vscsifrnt_shadow *shadow, *s = scsi_cmd_priv(sc);
- struct vscsiif_request *ring_req;
int err = 0;
- shadow = kmalloc(sizeof(*shadow), GFP_NOIO);
+ shadow = kzalloc(sizeof(*shadow), GFP_NOIO);
if (!shadow)
return FAILED;
+ shadow->act = act;
+ shadow->rslt_reset = RSLT_RESET_WAITING;
+ shadow->sc = sc;
+ shadow->ref_rqid = s->rqid;
+ init_waitqueue_head(&shadow->wq_reset);
+
spin_lock_irq(host->host_lock);
for (;;) {
- if (!RING_FULL(&info->ring)) {
- ring_req = scsifront_command2ring(info, sc, shadow);
- if (ring_req)
- break;
- }
- if (err || info->pause) {
- spin_unlock_irq(host->host_lock);
- kfree(shadow);
- return FAILED;
- }
+ if (scsifront_enter(info))
+ goto fail;
+
+ if (!scsifront_do_request(info, shadow))
+ break;
+
+ scsifront_return(info);
+ if (err)
+ goto fail;
info->wait_ring_available = 1;
spin_unlock_irq(host->host_lock);
err = wait_event_interruptible(info->wq_sync,
@@ -625,22 +615,6 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
spin_lock_irq(host->host_lock);
}
- if (scsifront_enter(info)) {
- spin_unlock_irq(host->host_lock);
- return FAILED;
- }
-
- ring_req->act = act;
- ring_req->ref_rqid = s->rqid;
-
- shadow->act = act;
- shadow->rslt_reset = RSLT_RESET_WAITING;
- init_waitqueue_head(&shadow->wq_reset);
-
- ring_req->nr_segments = 0;
-
- scsifront_do_request(info);
-
spin_unlock_irq(host->host_lock);
err = wait_event_interruptible(shadow->wq_reset, shadow->wait_reset);
spin_lock_irq(host->host_lock);
@@ -659,6 +633,11 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
scsifront_return(info);
spin_unlock_irq(host->host_lock);
return err;
+
+fail:
+ spin_unlock_irq(host->host_lock);
+ kfree(shadow);
+ return FAILED;
}
static int scsifront_eh_abort_handler(struct scsi_cmnd *sc)
@@ -1060,13 +1039,9 @@ static void scsifront_read_backend_params(struct xenbus_device *dev,
struct vscsifrnt_info *info)
{
unsigned int sg_grant, nr_segs;
- int ret;
struct Scsi_Host *host = info->host;
- ret = xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg-grant", "%u",
- &sg_grant);
- if (ret != 1)
- sg_grant = 0;
+ sg_grant = xenbus_read_unsigned(dev->otherend, "feature-sg-grant", 0);
nr_segs = min_t(unsigned int, sg_grant, SG_ALL);
nr_segs = max_t(unsigned int, nr_segs, VSCSIIF_SG_TABLESIZE);
nr_segs = min_t(unsigned int, nr_segs,
diff --git a/drivers/video/fbdev/xen-fbfront.c b/drivers/video/fbdev/xen-fbfront.c
index 0567d517eed3..d0115a7af0a9 100644
--- a/drivers/video/fbdev/xen-fbfront.c
+++ b/drivers/video/fbdev/xen-fbfront.c
@@ -633,7 +633,6 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
enum xenbus_state backend_state)
{
struct xenfb_info *info = dev_get_drvdata(&dev->dev);
- int val;
switch (backend_state) {
case XenbusStateInitialising:
@@ -657,16 +656,12 @@ InitWait:
if (dev->state != XenbusStateConnected)
goto InitWait; /* no InitWait seen yet, fudge it */
- if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "request-update", "%d", &val) < 0)
- val = 0;
- if (val)
+ if (xenbus_read_unsigned(info->xbdev->otherend,
+ "request-update", 0))
info->update_wanted = 1;
- if (xenbus_scanf(XBT_NIL, dev->otherend,
- "feature-resize", "%d", &val) < 0)
- val = 0;
- info->feature_resize = val;
+ info->feature_resize = xenbus_read_unsigned(dev->otherend,
+ "feature-resize", 0);
break;
case XenbusStateClosed:
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index e4db19e88ab1..db107fa50ca1 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -180,7 +180,6 @@ static void __balloon_append(struct page *page)
static void balloon_append(struct page *page)
{
__balloon_append(page);
- adjust_managed_page_count(page, -1);
}
/* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
@@ -201,8 +200,6 @@ static struct page *balloon_retrieve(bool require_lowmem)
else
balloon_stats.balloon_low--;
- adjust_managed_page_count(page, 1);
-
return page;
}
@@ -478,7 +475,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
#endif
/* Relinquish the page back to the allocator. */
- __free_reserved_page(page);
+ free_reserved_page(page);
}
balloon_stats.current_pages += rc;
@@ -509,6 +506,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
state = BP_EAGAIN;
break;
}
+ adjust_managed_page_count(page, -1);
scrub_page(page);
list_add(&page->lru, &pages);
}
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index adc19ce3cc66..fd8e872d2943 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -947,7 +947,7 @@ static int find_virq(unsigned int virq, unsigned int cpu)
continue;
if (status.status != EVTCHNSTAT_virq)
continue;
- if (status.u.virq == virq && status.vcpu == cpu) {
+ if (status.u.virq == virq && status.vcpu == xen_vcpu_nr(cpu)) {
rc = port;
break;
}
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 7a47c4c9fb1b..1bf55a32a4b3 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -127,18 +127,21 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
struct gntalloc_gref *gref, *next;
readonly = !(op->flags & GNTALLOC_FLAG_WRITABLE);
- rc = -ENOMEM;
for (i = 0; i < op->count; i++) {
gref = kzalloc(sizeof(*gref), GFP_KERNEL);
- if (!gref)
+ if (!gref) {
+ rc = -ENOMEM;
goto undo;
+ }
list_add_tail(&gref->next_gref, &queue_gref);
list_add_tail(&gref->next_file, &queue_file);
gref->users = 1;
gref->file_index = op->index + i * PAGE_SIZE;
gref->page = alloc_page(GFP_KERNEL|__GFP_ZERO);
- if (!gref->page)
+ if (!gref->page) {
+ rc = -ENOMEM;
goto undo;
+ }
/* Grant foreign access to the page. */
rc = gnttab_grant_foreign_access(op->domid,
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index bb952121ea94..2ef2b61b69df 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -1007,7 +1007,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
vma->vm_ops = &gntdev_vmops;
- vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_IO;
+ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_MIXEDMAP;
if (use_ptemod)
vma->vm_flags |= VM_DONTCOPY;
diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index b59c9455aae1..112ce422dc22 100644
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -125,8 +125,4 @@ static struct pci_driver platform_driver = {
.id_table = platform_pci_tbl,
};
-static int __init platform_pci_init(void)
-{
- return pci_register_driver(&platform_driver);
-}
-device_initcall(platform_pci_init);
+builtin_pci_driver(platform_driver);
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index 5ce878c51d03..3f0aee0a068b 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -362,7 +362,7 @@ static int xen_pcibk_reconfigure(struct xen_pcibk_device *pdev)
int err = 0;
int num_devs;
int domain, bus, slot, func;
- int substate;
+ unsigned int substate;
int i, len;
char state_str[64];
char dev_str[64];
@@ -395,10 +395,8 @@ static int xen_pcibk_reconfigure(struct xen_pcibk_device *pdev)
"configuration");
goto out;
}
- err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, state_str,
- "%d", &substate);
- if (err != 1)
- substate = XenbusStateUnknown;
+ substate = xenbus_read_unsigned(pdev->xdev->nodename, state_str,
+ XenbusStateUnknown);
switch (substate) {
case XenbusStateInitialising:
diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
index 1e8be12ebb55..6c0ead4be784 100644
--- a/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -538,6 +538,8 @@ static int xenbus_file_open(struct inode *inode, struct file *filp)
nonseekable_open(inode, filp);
+ filp->f_mode &= ~FMODE_ATOMIC_POS; /* cdev-style semantics */
+
u = kzalloc(sizeof(*u), GFP_KERNEL);
if (u == NULL)
return -ENOMEM;
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 33a31cfef55d..4bdf654041e9 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -702,7 +702,7 @@ device_initcall(xenbus_probe_initcall);
*/
static int __init xenstored_local_init(void)
{
- int err = 0;
+ int err = -ENOMEM;
unsigned long page = 0;
struct evtchn_alloc_unbound alloc_unbound;
@@ -826,7 +826,7 @@ static int __init xenbus_init(void)
* Create xenfs mountpoint in /proc for compatibility with
* utilities that expect to find "xenbus" under "/proc/xen".
*/
- proc_mkdir("xen", NULL);
+ proc_create_mount_point("xen");
#endif
out_error:
diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c b/drivers/xen/xenbus/xenbus_probe_backend.c
index 04f7f85a5edf..37929df829a3 100644
--- a/drivers/xen/xenbus/xenbus_probe_backend.c
+++ b/drivers/xen/xenbus/xenbus_probe_backend.c
@@ -224,13 +224,7 @@ static int read_frontend_details(struct xenbus_device *xendev)
int xenbus_dev_is_online(struct xenbus_device *dev)
{
- int rc, val;
-
- rc = xenbus_scanf(XBT_NIL, dev->nodename, "online", "%d", &val);
- if (rc != 1)
- val = 0; /* no online node present */
-
- return val;
+ return !!xenbus_read_unsigned(dev->nodename, "online", 0);
}
EXPORT_SYMBOL_GPL(xenbus_dev_is_online);
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 22f7cd711c57..6afb993c5809 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -559,6 +559,21 @@ int xenbus_scanf(struct xenbus_transaction t,
}
EXPORT_SYMBOL_GPL(xenbus_scanf);
+/* Read an (optional) unsigned value. */
+unsigned int xenbus_read_unsigned(const char *dir, const char *node,
+ unsigned int default_val)
+{
+ unsigned int val;
+ int ret;
+
+ ret = xenbus_scanf(XBT_NIL, dir, node, "%u", &val);
+ if (ret <= 0)
+ val = default_val;
+
+ return val;
+}
+EXPORT_SYMBOL_GPL(xenbus_read_unsigned);
+
/* Single printf and write: returns -errno or 0. */
int xenbus_printf(struct xenbus_transaction t,
const char *dir, const char *node, const char *fmt, ...)
@@ -672,7 +687,7 @@ static bool xen_strict_xenbus_quirk(void)
}
static void xs_reset_watches(void)
{
- int err, supported = 0;
+ int err;
if (!xen_hvm_domain() || xen_initial_domain())
return;
@@ -680,9 +695,8 @@ static void xs_reset_watches(void)
if (xen_strict_xenbus_quirk())
return;
- err = xenbus_scanf(XBT_NIL, "control",
- "platform-feature-xs_reset_watches", "%d", &supported);
- if (err != 1 || !supported)
+ if (!xenbus_read_unsigned("control",
+ "platform-feature-xs_reset_watches", 0))
return;
err = xs_error(xs_single(XBT_NIL, XS_RESET_WATCHES, "", NULL));
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.