linux-kernel - [RFC PATCH 1/2] drm/vgem: Add a dummy platform device

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Message-Id: <1491520713-14277-2-git-send-email-labbott@redhat.com>
Date:   Thu,  6 Apr 2017 16:18:32 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Sean Paul <seanpaul@...omium.org>
Cc:     Laura Abbott <labbott@...hat.com>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: [RFC PATCH 1/2] drm/vgem: Add a dummy platform device

The vgem driver is currently registered independent of any actual
device. Some usage of the dmabuf APIs require an actual device structure
to do anything. Register a dummy platform device for use with dmabuf.

Signed-off-by: Laura Abbott <labbott@...hat.com>
---
I realize the original driver had a note about 'drop platform support'. I
strongly dislike platform devices but they are the easiest way to get a device
structure for use with APIs like dmabuf.
---
 drivers/gpu/drm/vgem/vgem_drv.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
index a1f42d1..b94feef 100644
--- a/drivers/gpu/drm/vgem/vgem_drv.c
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -329,12 +329,19 @@ static struct drm_driver vgem_driver = {
 };
 
 static struct drm_device *vgem_device;
+static struct platform_device *vgem_pdev;
 
 static int __init vgem_init(void)
 {
 	int ret;
 
-	vgem_device = drm_dev_alloc(&vgem_driver, NULL);
+	vgem_pdev = platform_device_register_simple("vgem", -1, NULL, 0);
+	if (IS_ERR(vgem_pdev))
+		return PTR_ERR(vgem_pdev);
+
+	dma_coerce_mask_and_coherent(&vgem_pdev->dev, DMA_BIT_MASK(64));
+
+	vgem_device = drm_dev_alloc(&vgem_driver, &vgem_pdev->dev);
 	if (IS_ERR(vgem_device)) {
 		ret = PTR_ERR(vgem_device);
 		goto out;
@@ -349,6 +356,8 @@ static int __init vgem_init(void)
 out_unref:
 	drm_dev_unref(vgem_device);
 out:
+	platform_device_unregister(vgem_pdev);
+
 	return ret;
 }
 
@@ -356,6 +365,7 @@ static void __exit vgem_exit(void)
 {
 	drm_dev_unregister(vgem_device);
 	drm_dev_unref(vgem_device);
+	platform_device_unregister(vgem_pdev);
 }
 
 module_init(vgem_init);
-- 
2.7.4