linux-kernel - [PATCH v2 2/3] drm/prime: Wire up mmap

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Date:   Mon,  1 Aug 2022 10:04:56 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        linux-kernel@...r.kernel.org (open list),
        linux-media@...r.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK),
        linaro-mm-sig@...ts.linaro.org (moderated list:DMA BUFFER SHARING
        FRAMEWORK)
Subject: [PATCH v2 2/3] drm/prime: Wire up mmap_info support

From: Rob Clark <robdclark@...omium.org>

Just plumbing the thing thru an extra layer.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/drm_prime.c | 12 ++++++++++++
 include/drm/drm_drv.h       |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index e3f09f18110c..f58586e131c5 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -784,6 +784,17 @@ int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
 }
 EXPORT_SYMBOL(drm_gem_dmabuf_mmap);
 
+static int drm_gem_dmabuf_mmap_info(struct dma_buf *dma_buf)
+{
+	struct drm_gem_object *obj = dma_buf->priv;
+	struct drm_device *dev = obj->dev;
+
+	if (!dev->driver->gem_prime_mmap_info)
+		return -ENOSYS;
+
+	return dev->driver->gem_prime_mmap_info(obj);
+}
+
 static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
 	.cache_sgt_mapping = true,
 	.attach = drm_gem_map_attach,
@@ -792,6 +803,7 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
 	.unmap_dma_buf = drm_gem_unmap_dma_buf,
 	.release = drm_gem_dmabuf_release,
 	.mmap = drm_gem_dmabuf_mmap,
+	.mmap_info = drm_gem_dmabuf_mmap_info,
 	.vmap = drm_gem_dmabuf_vmap,
 	.vunmap = drm_gem_dmabuf_vunmap,
 };
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index f6159acb8856..797c0f8c2dd0 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -355,6 +355,13 @@ struct drm_driver {
 	 */
 	int (*gem_prime_mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
 
+	/**
+	 * @gem_prim_mmap_info:
+	 *
+	 * Get info about mmap setup by gem_prime_mmap.  See dma_buf_ops:mmap_info.
+	 */
+	int (*gem_prime_mmap_info)(struct drm_gem_object *obj);
+
 	/**
 	 * @dumb_create:
 	 *
-- 
2.36.1