[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3/7] xen-gntdev: Remove unneeded structures from grant_map tracking data
The entire hypercall argument list isn't required; only selected fields from the hypercall need to be tracked between the ioctl, map, and unmap operations. Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx> --- drivers/xen/gntdev.c | 222 ++++++++++++++++++++++++++++++-------------------- 1 files changed, 134 insertions(+), 88 deletions(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 7e21592..3778b85 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -56,18 +56,24 @@ struct gntdev_priv { struct mmu_notifier mn; }; +struct granted_page { + u64 pte_maddr; + union { + struct ioctl_gntdev_grant_ref target; + grant_handle_t handle; + }; +}; + struct grant_map { struct list_head next; struct gntdev_priv *priv; struct vm_area_struct *vma; int index; int count; - int flags; - int is_mapped; - struct ioctl_gntdev_grant_ref *grants; - struct gnttab_map_grant_ref *map_ops; - struct gnttab_unmap_grant_ref *unmap_ops; + int is_mapped:1; + int is_ro:1; struct page **pages; + struct granted_page pginfo[0]; }; /* ------------------------------------------------------------------ */ @@ -85,24 +91,19 @@ static void gntdev_print_maps(struct gntdev_priv *priv, map->index == text_index && text ? text : ""); } -static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count) +static struct grant_map *gntdev_alloc_map(int count, + struct ioctl_gntdev_grant_ref* grants) { struct grant_map *add; int i; - add = kzalloc(sizeof(struct grant_map), GFP_KERNEL); - if (NULL == add) + add = kzalloc(sizeof(*add) + sizeof(add->pginfo[0])*count, GFP_KERNEL); + if (!add) return NULL; - add->grants = kzalloc(sizeof(add->grants[0]) * count, GFP_KERNEL); - add->map_ops = kzalloc(sizeof(add->map_ops[0]) * count, GFP_KERNEL); - add->unmap_ops = kzalloc(sizeof(add->unmap_ops[0]) * count, GFP_KERNEL); - add->pages = kzalloc(sizeof(add->pages[0]) * count, GFP_KERNEL); - if (NULL == add->grants || - NULL == add->map_ops || - NULL == add->unmap_ops || - NULL == add->pages) - goto err; + add->pages = kzalloc(sizeof(add->pages[0])*count, GFP_KERNEL); + if (!add->pages) + goto err_nopages; for (i = 0; i < count; i++) { add->pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); @@ -112,20 +113,18 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count) add->index = 0; add->count = count; - add->priv = priv; + for(i = 0; i < count; i++) + add->pginfo[i].target = grants[i]; return add; err: - if (add->pages) - for (i = 0; i < count; i++) { - if (add->pages[i]) - __free_page(add->pages[i]); - } + for (i = 0; i < count; i++) { + if (add->pages[i]) + __free_page(add->pages[i]); + } kfree(add->pages); - kfree(add->grants); - kfree(add->map_ops); - kfree(add->unmap_ops); +err_nopages: kfree(add); return NULL; } @@ -134,6 +133,7 @@ static void gntdev_add_map(struct gntdev_priv *priv, struct grant_map *add) { struct grant_map *map; + spin_lock(&priv->lock); list_for_each_entry(map, &priv->maps, next) { if (add->index + add->count < map->index) { list_add_tail(&add->next, &map->next); @@ -144,8 +144,10 @@ static void gntdev_add_map(struct gntdev_priv *priv, struct grant_map *add) list_add_tail(&add->next, &priv->maps); done: + add->priv = priv; if (debug) gntdev_print_maps(priv, "[new]", add->index); + spin_unlock(&priv->lock); } static struct grant_map *gntdev_find_map_index(struct gntdev_priv *priv, int index, @@ -186,9 +188,10 @@ static int gntdev_del_map(struct grant_map *map) if (map->vma) return -EBUSY; - for (i = 0; i < map->count; i++) - if (map->unmap_ops[i].handle) - return -EBUSY; + if (map->is_mapped) + for (i = 0; i < map->count; i++) + if (map->pginfo[i].handle) + return -EBUSY; atomic_sub(map->count, &pages_mapped); list_del(&map->next); @@ -202,15 +205,10 @@ static void gntdev_free_map(struct grant_map *map) if (!map) return; - if (map->pages) - for (i = 0; i < map->count; i++) { - if (map->pages[i]) - __free_page(map->pages[i]); - } - kfree(map->pages); - kfree(map->grants); - kfree(map->map_ops); - kfree(map->unmap_ops); + for (i = 0; i < map->count; i++) { + if (map->pages[i]) + __free_page(map->pages[i]); + } kfree(map); } @@ -223,53 +221,99 @@ static int find_grant_ptes(pte_t *pte, pgtable_t token, unsigned long addr, void u64 pte_maddr; BUG_ON(pgnr >= map->count); + pte_maddr = arbitrary_virt_to_machine(pte).maddr; + map->pginfo[pgnr].pte_maddr = pte_maddr; - gnttab_set_map_op(&map->map_ops[pgnr], pte_maddr, - GNTMAP_contains_pte | map->flags, - map->grants[pgnr].ref, - map->grants[pgnr].domid); - gnttab_set_unmap_op(&map->unmap_ops[pgnr], pte_maddr, - GNTMAP_contains_pte | map->flags, - 0 /* handle */); return 0; } static int map_grant_pages(struct grant_map *map) { - int i, err = 0; + int i, flags, err = 0; + struct gnttab_map_grant_ref* map_ops = NULL; + flags = GNTMAP_host_map | GNTMAP_application_map | GNTMAP_contains_pte; + if (map->is_ro) + flags |= GNTMAP_readonly; + + err = -ENOMEM; + map_ops = kzalloc(sizeof(map_ops[0]) * map->count, GFP_TEMPORARY); + if (!map_ops) + goto out; + + for(i=0; i < map->count; i++) { + gnttab_set_map_op(&map_ops[i], map->pginfo[i].pte_maddr, flags, + map->pginfo[i].target.ref, + map->pginfo[i].target.domid); + } if (debug) printk("%s: map %d+%d\n", __FUNCTION__, map->index, map->count); - err = gnttab_map_refs(map->map_ops, map->pages, map->count); + + err = gnttab_map_refs(map_ops, map->pages, map->count); + if (WARN_ON(err)) - return err; + goto out; for (i = 0; i < map->count; i++) { - if (map->map_ops[i].status) + if (map_ops[i].status) { + __free_page(map->pages[i]); + map->pages[i] = NULL; err = -EINVAL; - map->unmap_ops[i].handle = map->map_ops[i].handle; + } else { + map->pginfo[i].handle = map_ops[i].handle; + } } + +out: + kfree(map_ops); return err; } -static int unmap_grant_pages(struct grant_map *map, int offset, int pages) +static void unmap_grant_pages(struct grant_map *map, int offset, int pages) { - int i, err = 0; + int i, flags, err = 0; + struct gnttab_unmap_grant_ref *unmap_ops; + struct gnttab_unmap_grant_ref unmap_single; + + if (pages > 1) { + unmap_ops = kzalloc(sizeof(unmap_ops[0]) * pages, + GFP_TEMPORARY); + if (unlikely(!unmap_ops)) { + for(i=0; i < pages; i++) + unmap_grant_pages(map, offset + i, 1); + return; + } + } else { + unmap_ops = &unmap_single; + } + + flags = GNTMAP_host_map | GNTMAP_application_map | GNTMAP_contains_pte; + if (map->is_ro) + flags |= GNTMAP_readonly; + for(i=0; i < pages; i++) + gnttab_set_unmap_op(&unmap_ops[i], + map->pginfo[offset+i].pte_maddr, flags, + map->pginfo[offset+i].handle); if (debug) printk("%s: map %d+%d [%d+%d]\n", __FUNCTION__, map->index, map->count, offset, pages); - err = gnttab_unmap_refs(map->unmap_ops + offset, map->pages, pages); + + err = gnttab_unmap_refs(unmap_ops, map->pages + offset, pages); + if (WARN_ON(err)) - return err; + goto out; for (i = 0; i < pages; i++) { - if (map->unmap_ops[offset+i].status) - err = -EINVAL; - map->unmap_ops[offset+i].handle = 0; + WARN_ON(unmap_ops[i].status); + __free_page(map->pages[offset+i]); + map->pages[offset+i] = NULL; + map->pginfo[offset+i].handle = 0; } - return err; +out: + if (unmap_ops != &unmap_single) + kfree(unmap_ops); } /* ------------------------------------------------------------------ */ @@ -308,7 +352,6 @@ static void mn_invl_range_start(struct mmu_notifier *mn, struct gntdev_priv *priv = container_of(mn, struct gntdev_priv, mn); struct grant_map *map; unsigned long mstart, mend; - int err; spin_lock(&priv->lock); list_for_each_entry(map, &priv->maps, next) { @@ -327,10 +370,9 @@ static void mn_invl_range_start(struct mmu_notifier *mn, __FUNCTION__, map->index, map->count, map->vma->vm_start, map->vma->vm_end, start, end, mstart, mend); - err = unmap_grant_pages(map, - (mstart - map->vma->vm_start) >> PAGE_SHIFT, - (mend - mstart) >> PAGE_SHIFT); - WARN_ON(err); + unmap_grant_pages(map, + (mstart - map->vma->vm_start) >> PAGE_SHIFT, + (mend - mstart) >> PAGE_SHIFT); } spin_unlock(&priv->lock); } @@ -347,7 +389,6 @@ static void mn_release(struct mmu_notifier *mn, { struct gntdev_priv *priv = container_of(mn, struct gntdev_priv, mn); struct grant_map *map; - int err; spin_lock(&priv->lock); list_for_each_entry(map, &priv->maps, next) { @@ -357,8 +398,7 @@ static void mn_release(struct mmu_notifier *mn, printk("%s: map %d+%d (%lx %lx)\n", __FUNCTION__, map->index, map->count, map->vma->vm_start, map->vma->vm_end); - err = unmap_grant_pages(map, 0, map->count); - WARN_ON(err); + unmap_grant_pages(map, 0, map->count); } spin_unlock(&priv->lock); } @@ -427,6 +467,7 @@ static long gntdev_ioctl_map_grant_ref(struct gntdev_priv *priv, { struct ioctl_gntdev_map_grant_ref op; struct grant_map *map; + struct ioctl_gntdev_grant_ref* grants; int err; if (copy_from_user(&op, u, sizeof(op)) != 0) @@ -437,38 +478,45 @@ static long gntdev_ioctl_map_grant_ref(struct gntdev_priv *priv, if (unlikely(op.count <= 0)) return -EINVAL; - err = -ENOMEM; - map = gntdev_alloc_map(priv, op.count); - if (!map) - return err; + grants = kmalloc(sizeof(grants[0]) * op.count, GFP_TEMPORARY); + if (!grants) + return -ENOMEM; - if (copy_from_user(map->grants, &u->refs, - sizeof(map->grants[0]) * op.count) != 0) { - gntdev_free_map(map); - return err; + if (copy_from_user(grants, u->refs, sizeof(grants[0]) * op.count)) { + err = -EFAULT; + goto out_free; } + err = -ENOMEM; + map = gntdev_alloc_map(op.count, grants); + if (!map) + goto out_free; + if (unlikely(atomic_add_return(op.count, &pages_mapped) > limit)) { if (debug) printk("%s: can't map: over limit\n", __FUNCTION__); - gntdev_free_map(map); - return err; + goto out_free_map; } - spin_lock(&priv->lock); gntdev_add_map(priv, map); op.index = map->index << PAGE_SHIFT; - spin_unlock(&priv->lock); - if (copy_to_user(u, &op, sizeof(op)) != 0) { - spin_lock(&priv->lock); - gntdev_del_map(map); - spin_unlock(&priv->lock); - gntdev_free_map(map); - return err; + if (copy_to_user(u, &op, sizeof(op))) { + err = -EFAULT; + goto out_remove; } - return 0; + err = 0; +out_free: + kfree(grants); + return err; +out_remove: + spin_lock(&priv->lock); + gntdev_del_map(map); + spin_unlock(&priv->lock); +out_free_map: + gntdev_free_map(map); + goto out_free; } static long gntdev_ioctl_unmap_grant_ref(struct gntdev_priv *priv, @@ -584,9 +632,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) vma->vm_private_data = map; map->vma = vma; - map->flags = GNTMAP_host_map | GNTMAP_application_map; - if (!(vma->vm_flags & VM_WRITE)) - map->flags |= GNTMAP_readonly; + map->is_ro = !(vma->vm_flags & VM_WRITE); spin_unlock(&priv->lock); -- 1.7.2.3 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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