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-rw-r--r--drivers/block/xen-blkback/blkback.c32
-rw-r--r--drivers/net/xen-netback/netback.c4
-rw-r--r--drivers/xen/gntdev.c37
-rw-r--r--drivers/xen/xen-scsiback.c4
4 files changed, 41 insertions, 36 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 9ebf53903d7b..da16121140ca 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -794,8 +794,13 @@ again:
pages[i]->persistent_gnt = persistent_gnt;
} else {
if (gnttab_page_cache_get(&ring->free_pages,
- &pages[i]->page))
- goto out_of_memory;
+ &pages[i]->page)) {
+ gnttab_page_cache_put(&ring->free_pages,
+ pages_to_gnt,
+ segs_to_map);
+ ret = -ENOMEM;
+ goto out;
+ }
addr = vaddr(pages[i]->page);
pages_to_gnt[segs_to_map] = pages[i]->page;
pages[i]->persistent_gnt = NULL;
@@ -811,10 +816,8 @@ again:
break;
}
- if (segs_to_map) {
+ if (segs_to_map)
ret = gnttab_map_refs(map, NULL, pages_to_gnt, segs_to_map);
- BUG_ON(ret);
- }
/*
* Now swizzle the MFN in our domain with the MFN from the other domain
@@ -830,7 +833,7 @@ again:
gnttab_page_cache_put(&ring->free_pages,
&pages[seg_idx]->page, 1);
pages[seg_idx]->handle = BLKBACK_INVALID_HANDLE;
- ret |= 1;
+ ret |= !ret;
goto next;
}
pages[seg_idx]->handle = map[new_map_idx].handle;
@@ -882,17 +885,18 @@ next:
}
segs_to_map = 0;
last_map = map_until;
- if (map_until != num)
+ if (!ret && map_until != num)
goto again;
- return ret;
-
-out_of_memory:
- pr_alert("%s: out of memory\n", __func__);
- gnttab_page_cache_put(&ring->free_pages, pages_to_gnt, segs_to_map);
- for (i = last_map; i < num; i++)
+out:
+ for (i = last_map; i < num; i++) {
+ /* Don't zap current batch's valid persistent grants. */
+ if(i >= last_map + segs_to_map)
+ pages[i]->persistent_gnt = NULL;
pages[i]->handle = BLKBACK_INVALID_HANDLE;
- return -ENOMEM;
+ }
+
+ return ret;
}
static int xen_blkbk_map_seg(struct pending_req *pending_req)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 19a27dce79d2..e5c73f819662 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1343,13 +1343,11 @@ int xenvif_tx_action(struct xenvif_queue *queue, int budget)
return 0;
gnttab_batch_copy(queue->tx_copy_ops, nr_cops);
- if (nr_mops != 0) {
+ if (nr_mops != 0)
ret = gnttab_map_refs(queue->tx_map_ops,
NULL,
queue->pages_to_map,
nr_mops);
- BUG_ON(ret);
- }
work_done = xenvif_tx_submit(queue);
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index a36b71286bcf..5447c5156b2e 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -309,44 +309,47 @@ int gntdev_map_grant_pages(struct gntdev_grant_map *map)
* to the kernel linear addresses of the struct pages.
* These ptes are completely different from the user ptes dealt
* with find_grant_ptes.
+ * Note that GNTMAP_device_map isn't needed here: The
+ * dev_bus_addr output field gets consumed only from ->map_ops,
+ * and by not requesting it when mapping we also avoid needing
+ * to mirror dev_bus_addr into ->unmap_ops (and holding an extra
+ * reference to the page in the hypervisor).
*/
+ unsigned int flags = (map->flags & ~GNTMAP_device_map) |
+ GNTMAP_host_map;
+
for (i = 0; i < map->count; i++) {
unsigned long address = (unsigned long)
pfn_to_kaddr(page_to_pfn(map->pages[i]));
BUG_ON(PageHighMem(map->pages[i]));
- gnttab_set_map_op(&map->kmap_ops[i], address,
- map->flags | GNTMAP_host_map,
+ gnttab_set_map_op(&map->kmap_ops[i], address, flags,
map->grants[i].ref,
map->grants[i].domid);
gnttab_set_unmap_op(&map->kunmap_ops[i], address,
- map->flags | GNTMAP_host_map, -1);
+ flags, -1);
}
}
pr_debug("map %d+%d\n", map->index, map->count);
err = gnttab_map_refs(map->map_ops, use_ptemod ? map->kmap_ops : NULL,
map->pages, map->count);
- if (err)
- return err;
for (i = 0; i < map->count; i++) {
- if (map->map_ops[i].status) {
+ if (map->map_ops[i].status == GNTST_okay)
+ map->unmap_ops[i].handle = map->map_ops[i].handle;
+ else if (!err)
err = -EINVAL;
- continue;
- }
- map->unmap_ops[i].handle = map->map_ops[i].handle;
- if (use_ptemod)
- map->kunmap_ops[i].handle = map->kmap_ops[i].handle;
-#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
- else if (map->dma_vaddr) {
- unsigned long bfn;
+ if (map->flags & GNTMAP_device_map)
+ map->unmap_ops[i].dev_bus_addr = map->map_ops[i].dev_bus_addr;
- bfn = pfn_to_bfn(page_to_pfn(map->pages[i]));
- map->unmap_ops[i].dev_bus_addr = __pfn_to_phys(bfn);
+ if (use_ptemod) {
+ if (map->kmap_ops[i].status == GNTST_okay)
+ map->kunmap_ops[i].handle = map->kmap_ops[i].handle;
+ else if (!err)
+ err = -EINVAL;
}
-#endif
}
return err;
}
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 8b59897b2df9..f3024942fbdf 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -386,12 +386,12 @@ static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
return 0;
err = gnttab_map_refs(map, NULL, pg, cnt);
- BUG_ON(err);
for (i = 0; i < cnt; i++) {
if (unlikely(map[i].status != GNTST_okay)) {
pr_err("invalid buffer -- could not remap it\n");
map[i].handle = SCSIBACK_INVALID_HANDLE;
- err = -ENOMEM;
+ if (!err)
+ err = -ENOMEM;
} else {
get_page(pg[i]);
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-29 01:05:00 +0300