[PATCH v3 13/16] drm/msm: Add support to create target specific address spaces

Jordan Crouse
2019-05-29T20:56:01Z

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@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 4c51063..dd3eb30 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -609,6 +609,14 @@ 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;
@@ -618,9 +626,16 @@ 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;
@@ -636,8 +651,12 @@ 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);
}
@@ -652,7 +671,7 @@ 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 d4bf051..588d7ba 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -77,6 +77,7 @@ 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