[RFC PATCH v1 12/15] drm/msm: Add support to create target specific address spaces

[Jordan Crouse]

Add support to create a GPU target specific address space for
a context. For those targets that support per-instance
pagetables they will return a new address space set up for
the instance if possible otherwise just use the global
device pagetable.

Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
---

 drivers/gpu/drm/msm/msm_drv.c | 25 ++++++++++++++++++++++---
 drivers/gpu/drm/msm/msm_gpu.h |  1 +
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index cac2293..5b83093 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -605,6 +605,14 @@ static void load_gpu(struct drm_device *dev)
 	mutex_unlock(&init_lock);
 }
 
+static struct msm_gem_address_space *context_address_space(struct msm_gpu *gpu)
+{
+	if (!gpu->funcs->new_address_space)
+		return gpu->aspace;
+
+	return gpu->funcs->new_address_space(gpu);
+}
+
 static int context_init(struct drm_device *dev, struct drm_file *file)
 {
 	struct msm_drm_private *priv = dev->dev_private;
@@ -614,9 +622,16 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
 	if (!ctx)
 		return -ENOMEM;
 
+	ctx->aspace = context_address_space(priv->gpu);
+	if (IS_ERR(ctx->aspace)) {
+		int ret = PTR_ERR(ctx->aspace);
+
+		kfree(ctx);
+		return ret;
+	}
+
 	msm_submitqueue_init(dev, ctx);
 
-	ctx->aspace = priv->gpu->aspace;
 	file->driver_priv = ctx;
 
 	return 0;
@@ -632,8 +647,12 @@ static int msm_open(struct drm_device *dev, struct drm_file *file)
 	return context_init(dev, file);
 }
 
-static void context_close(struct msm_file_private *ctx)
+static void context_close(struct msm_drm_private *priv,
+		struct msm_file_private *ctx)
 {
+	if (ctx->aspace != priv->gpu->aspace)
+		msm_gem_address_space_put(ctx->aspace);
+
 	msm_submitqueue_close(ctx);
 	kfree(ctx);
 }
@@ -648,7 +667,7 @@ static void msm_postclose(struct drm_device *dev, struct drm_file *file)
 		priv->lastctx = NULL;
 	mutex_unlock(&dev->struct_mutex);
 
-	context_close(ctx);
+	context_close(priv, ctx);
 }
 
 static irqreturn_t msm_irq(int irq, void *arg)
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 81b9861..35b0faf 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -76,6 +76,7 @@ struct msm_gpu_funcs {
 	void (*gpu_set_freq)(struct msm_gpu *gpu, unsigned long freq);
 	struct msm_gem_address_space *(*create_address_space)
 		(struct msm_gpu *gpu);
+	struct msm_gem_address_space *(*new_address_space)(struct msm_gpu *gpu);
 };
 
 struct msm_gpu {
-- 
2.7.4