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

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Date:   Wed, 17 May 2023 16:52:35 +0200
From:   Alexandre Bailon <abailon@...libre.com>
To:     airlied@...il.com, daniel@...ll.ch,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, sumit.semwal@...aro.org,
        christian.koenig@....com, jstephan@...libre.com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org, khilman@...libre.com,
        nbelin@...libre.com, bero@...libre.com
Subject: [PATCH 5/7] drm/apu: allow platform driver to implement their own mmap function

From: Julien Stephan <jstephan@...libre.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@...libre.com>
Reviewed-by: Julien Stephan <jstephan@...libre.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