[PATCH 5/7] drm/apu: allow platform driver to implement their own mmap function

From: Alexandre Bailon <abailon@baylibre.com>
To: airlied@gmail.com, daniel@ffwll.ch,
	maarten.lankhorst@linux.intel.com, mripard@kernel.org,
	tzimmermann@suse.de
Cc: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
	conor+dt@kernel.org, matthias.bgg@gmail.com,
	angelogioacchino.delregno@collabora.com, sumit.semwal@linaro.org,
	christian.koenig@amd.com, jstephan@baylibre.com,
	dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, linux-media@vger.kernel.org,
	linaro-mm-sig@lists.linaro.org, khilman@baylibre.com,
	nbelin@baylibre.com, bero@baylibre.com
Subject: [PATCH 5/7] drm/apu: allow platform driver to implement their own mmap function
Date: Wed, 17 May 2023 16:52:35 +0200	[thread overview]
Message-ID: <20230517145237.295461-6-abailon@baylibre.com> (raw)
In-Reply-To: <20230517145237.295461-1-abailon@baylibre.com>

From: Julien Stephan <jstephan@baylibre.com>

By default we will call drm_gem_mmap() unless the apu driver has
declared it's own mmap handler.

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Reviewed-by: Julien Stephan <jstephan@baylibre.com>
---
 drivers/gpu/drm/apu/apu_drv.c      | 38 +++++++++++++++++++++++++++++-
 drivers/gpu/drm/apu/apu_internal.h |  2 ++
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/apu/apu_drv.c b/drivers/gpu/drm/apu/apu_drv.c
index a0dce785a02a..703d4515f075 100644
--- a/drivers/gpu/drm/apu/apu_drv.c
+++ b/drivers/gpu/drm/apu/apu_drv.c
@@ -29,7 +29,20 @@ static const struct drm_ioctl_desc ioctls[] = {
 			  DRM_RENDER_ALLOW),
 };
 
-DEFINE_DRM_GEM_DMA_FOPS(apu_drm_ops);
+static int apu_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
+
+static const struct file_operations apu_drm_ops = {
+	.owner          = THIS_MODULE,
+	.open           = drm_open,
+	.release        = drm_release,
+	.unlocked_ioctl = drm_ioctl,
+	.compat_ioctl   = drm_compat_ioctl,
+	.poll           = drm_poll,
+	.read           = drm_read,
+	.llseek         = noop_llseek,
+	.mmap           = apu_drm_gem_mmap,
+	DRM_GEM_DMA_UNMAPPED_AREA_FOPS
+};
 
 static struct drm_driver apu_drm_driver = {
 	.driver_features = DRIVER_GEM | DRIVER_SYNCOBJ,
@@ -45,6 +58,29 @@ static struct drm_driver apu_drm_driver = {
 	DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_gem_dma_dumb_create),
 };
 
+/**
+ * apu_drm_gem_mmap()
+ *
+ * @filp: DRM file pointer
+ * @vma: VMA for the area to be mapped
+ *
+ * by default will call drm_gem_mmap() unless the apu driver has declared it's
+ * own mmap handler
+ *
+ */
+static int apu_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_file *priv = filp->private_data;
+	struct drm_device *dev = priv->minor->dev;
+	struct apu_drm *apu = dev->dev_private;
+
+	if (apu->mmap)
+		return apu->mmap(filp, vma);
+	else
+		return drm_gem_mmap(filp, vma);
+}
+
+
 /**
  * apu_dev_alloc() - Allocate a new APU device
  *
diff --git a/drivers/gpu/drm/apu/apu_internal.h b/drivers/gpu/drm/apu/apu_internal.h
index ea4183f3fb15..46e0b2be7821 100644
--- a/drivers/gpu/drm/apu/apu_internal.h
+++ b/drivers/gpu/drm/apu/apu_internal.h
@@ -45,6 +45,8 @@ struct apu_drm {
 	struct iova_domain iovad;
 	int iova_limit_pfn;
 
+	int (*mmap)(struct file *filp, struct vm_area_struct *vma);
+
 	struct list_head cores;
 	struct list_head node;
 
-- 
2.39.2


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