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