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authorShannon Zhao <shannon.zhao@linaro.org>2016-04-07 15:03:19 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2016-07-06 12:34:42 +0300
commit243848fc018cb98c2a70c39fe1f93eb266c79835 (patch)
treec56b6a9be9fe3502cebbef3aea3c4b3425b76aba /drivers/xen/xlate_mmu.c
parenta4e081b0dd16780d960b1ef86985de40a6729fb5 (diff)
downloadlinux-243848fc018cb98c2a70c39fe1f93eb266c79835.tar.xz
xen/grant-table: Move xlated_setup_gnttab_pages to common place
Move xlated_setup_gnttab_pages to common place, so it can be reused by ARM to setup grant table. Rename it to xen_xlate_map_ballooned_pages. Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Julien Grall <julien.grall@arm.com> Tested-by: Julien Grall <julien.grall@arm.com>
Diffstat (limited to 'drivers/xen/xlate_mmu.c')
-rw-r--r--drivers/xen/xlate_mmu.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index 5063c5e796b7..9692656f2fdf 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -29,6 +29,8 @@
*/
#include <linux/kernel.h>
#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
@@ -37,6 +39,7 @@
#include <xen/page.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
+#include <xen/balloon.h>
typedef void (*xen_gfn_fn_t)(unsigned long gfn, void *data);
@@ -185,3 +188,61 @@ int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
return 0;
}
EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);
+
+/**
+ * xen_xlate_map_ballooned_pages - map a new set of ballooned pages
+ * @gfns: returns the array of corresponding GFNs
+ * @virt: returns the virtual address of the mapped region
+ * @nr_grant_frames: number of GFNs
+ * @return 0 on success, error otherwise
+ *
+ * This allocates a set of ballooned pages and maps them into the
+ * kernel's address space.
+ */
+int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
+ unsigned long nr_grant_frames)
+{
+ struct page **pages;
+ xen_pfn_t *pfns;
+ void *vaddr;
+ int rc;
+ unsigned int i;
+
+ BUG_ON(nr_grant_frames == 0);
+ pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
+ if (!pages)
+ return -ENOMEM;
+
+ pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
+ if (!pfns) {
+ kfree(pages);
+ return -ENOMEM;
+ }
+ rc = alloc_xenballooned_pages(nr_grant_frames, pages);
+ if (rc) {
+ pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
+ nr_grant_frames, rc);
+ kfree(pages);
+ kfree(pfns);
+ return rc;
+ }
+ for (i = 0; i < nr_grant_frames; i++)
+ pfns[i] = page_to_pfn(pages[i]);
+
+ vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
+ if (!vaddr) {
+ pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
+ nr_grant_frames, rc);
+ free_xenballooned_pages(nr_grant_frames, pages);
+ kfree(pages);
+ kfree(pfns);
+ return -ENOMEM;
+ }
+ kfree(pages);
+
+ *gfns = pfns;
+ *virt = vaddr;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);