linux-kernel - [PATCH 5/6] drm/xen-front: Pass dumb buffer data offset to the backend

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Message-Id: <20200731125109.18666-6-andr2000@gmail.com>
Date:   Fri, 31 Jul 2020 15:51:08 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     xen-devel@...ts.xenproject.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, airlied@...ux.ie, daniel@...ll.ch
Cc:     sstabellini@...nel.org, dan.carpenter@...cle.com,
        intel-gfx@...ts.freedesktop.org,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: [PATCH 5/6] drm/xen-front: Pass dumb buffer data offset to the backend

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>

While importing a dmabuf it is possible that the data of the buffer
is put with offset which is indicated by the SGT offset.
Respect the offset value and forward it to the backend.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
---
 drivers/gpu/drm/xen/xen_drm_front.c     | 6 ++++--
 drivers/gpu/drm/xen/xen_drm_front.h     | 2 +-
 drivers/gpu/drm/xen/xen_drm_front_gem.c | 3 ++-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c
index 88db2726e8ce..013c9e0e412c 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.c
+++ b/drivers/gpu/drm/xen/xen_drm_front.c
@@ -157,7 +157,8 @@ int xen_drm_front_mode_set(struct xen_drm_front_drm_pipeline *pipeline,
 
 int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
 			      u64 dbuf_cookie, u32 width, u32 height,
-			      u32 bpp, u64 size, struct page **pages)
+			      u32 bpp, u64 size, u32 offset,
+			      struct page **pages)
 {
 	struct xen_drm_front_evtchnl *evtchnl;
 	struct xen_drm_front_dbuf *dbuf;
@@ -194,6 +195,7 @@ int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
 	req->op.dbuf_create.gref_directory =
 			xen_front_pgdir_shbuf_get_dir_start(&dbuf->shbuf);
 	req->op.dbuf_create.buffer_sz = size;
+	req->op.dbuf_create.data_ofs = offset;
 	req->op.dbuf_create.dbuf_cookie = dbuf_cookie;
 	req->op.dbuf_create.width = width;
 	req->op.dbuf_create.height = height;
@@ -408,7 +410,7 @@ static int xen_drm_drv_dumb_create(struct drm_file *filp,
 	ret = xen_drm_front_dbuf_create(drm_info->front_info,
 					xen_drm_front_dbuf_to_cookie(obj),
 					args->width, args->height, args->bpp,
-					args->size,
+					args->size, 0,
 					xen_drm_front_gem_get_pages(obj));
 	if (ret)
 		goto fail_backend;
diff --git a/drivers/gpu/drm/xen/xen_drm_front.h b/drivers/gpu/drm/xen/xen_drm_front.h
index f92c258350ca..54486d89650e 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.h
+++ b/drivers/gpu/drm/xen/xen_drm_front.h
@@ -145,7 +145,7 @@ int xen_drm_front_mode_set(struct xen_drm_front_drm_pipeline *pipeline,
 
 int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
 			      u64 dbuf_cookie, u32 width, u32 height,
-			      u32 bpp, u64 size, struct page **pages);
+			      u32 bpp, u64 size, u32 offset, struct page **pages);
 
 int xen_drm_front_fb_attach(struct xen_drm_front_info *front_info,
 			    u64 dbuf_cookie, u64 fb_cookie, u32 width,
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
index 4ec8a49241e1..39ff95b75357 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -210,7 +210,8 @@ xen_drm_front_gem_import_sg_table(struct drm_device *dev,
 
 	ret = xen_drm_front_dbuf_create(drm_info->front_info,
 					xen_drm_front_dbuf_to_cookie(&xen_obj->base),
-					0, 0, 0, size, xen_obj->pages);
+					0, 0, 0, size, sgt->sgl->offset,
+					xen_obj->pages);
 	if (ret < 0)
 		return ERR_PTR(ret);
 
-- 
2.17.1