linux-kernel - [PATCH v4 5/9] drm/xen/xen_drm_front_gem.c: Convert to use vm_map

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Date:   Fri, 15 Feb 2019 08:16:24 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     akpm@...ux-foundation.org, willy@...radead.org, mhocko@...e.com,
        oleksandr_andrushchenko@...m.com, airlied@...ux.ie,
        linux@...linux.org.uk, robin.murphy@....com
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        dri-devel@...ts.freedesktop.org, xen-devel@...ts.xen.org
Subject: [PATCH v4 5/9] drm/xen/xen_drm_front_gem.c: Convert to use
 vm_map_pages()

Convert to use vm_map_pages() to map range of kernel
memory to user vma.

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
---
 drivers/gpu/drm/xen/xen_drm_front_gem.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
index 28bc501..dd0602d 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -224,8 +224,7 @@ struct drm_gem_object *
 static int gem_mmap_obj(struct xen_gem_object *xen_obj,
 			struct vm_area_struct *vma)
 {
-	unsigned long addr = vma->vm_start;
-	int i;
+	int ret;
 
 	/*
 	 * clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
@@ -246,18 +245,11 @@ static int gem_mmap_obj(struct xen_gem_object *xen_obj,
 	 * FIXME: as we insert all the pages now then no .fault handler must
 	 * be called, so don't provide one
 	 */
-	for (i = 0; i < xen_obj->num_pages; i++) {
-		int ret;
-
-		ret = vm_insert_page(vma, addr, xen_obj->pages[i]);
-		if (ret < 0) {
-			DRM_ERROR("Failed to insert pages into vma: %d\n", ret);
-			return ret;
-		}
+	ret = vm_map_pages(vma, xen_obj->pages, xen_obj->num_pages);
+	if (ret < 0)
+		DRM_ERROR("Failed to map pages into vma: %d\n", ret);
 
-		addr += PAGE_SIZE;
-	}
-	return 0;
+	return ret;
 }
 
 int xen_drm_front_gem_mmap(struct file *filp, struct vm_area_struct *vma)
-- 
1.9.1