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Subject[PATCH v1 3/5] drm/tegra: gr3d: Add IOMMU support
Date
Attach GR3D to the displays IOMMU group in order to provide GR3D access
to BO's IOVA.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/gpu/drm/tegra/gr3d.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
index 28c4ef63065b..ce5120683091 100644
--- a/drivers/gpu/drm/tegra/gr3d.c
+++ b/drivers/gpu/drm/tegra/gr3d.c
@@ -9,6 +9,7 @@

#include <linux/clk.h>
#include <linux/host1x.h>
+#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
@@ -20,6 +21,7 @@
#include "gr3d.h"

struct gr3d {
+ struct iommu_group *group;
struct tegra_drm_client client;
struct host1x_channel *channel;
struct clk *clk_secondary;
@@ -40,7 +42,9 @@ static int gr3d_init(struct host1x_client *client)
struct tegra_drm_client *drm = host1x_to_drm_client(client);
struct drm_device *dev = dev_get_drvdata(client->parent);
unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
+ struct tegra_drm *tegra = dev->dev_private;
struct gr3d *gr3d = to_gr3d(drm);
+ int err;

gr3d->channel = host1x_channel_request(client->dev);
if (!gr3d->channel)
@@ -52,6 +56,23 @@ static int gr3d_init(struct host1x_client *client)
return -ENOMEM;
}

+ if (tegra->domain) {
+ gr3d->group = iommu_group_get(client->dev);
+
+ if (gr3d->group) {
+ err = iommu_attach_group(tegra->domain, gr3d->group);
+ if (err < 0) {
+ dev_err(client->dev,
+ "failed to attach to domain: %d\n",
+ err);
+ host1x_syncpt_free(client->syncpts[0]);
+ host1x_channel_put(gr3d->channel);
+ iommu_group_put(gr3d->group);
+ return err;
+ }
+ }
+ }
+
return tegra_drm_register_client(dev->dev_private, drm);
}

@@ -59,6 +80,7 @@ static int gr3d_exit(struct host1x_client *client)
{
struct tegra_drm_client *drm = host1x_to_drm_client(client);
struct drm_device *dev = dev_get_drvdata(client->parent);
+ struct tegra_drm *tegra = dev->dev_private;
struct gr3d *gr3d = to_gr3d(drm);
int err;

@@ -69,6 +91,11 @@ static int gr3d_exit(struct host1x_client *client)
host1x_syncpt_free(client->syncpts[0]);
host1x_channel_put(gr3d->channel);

+ if (gr3d->group) {
+ iommu_detach_group(tegra->domain, gr3d->group);
+ iommu_group_put(gr3d->group);
+ }
+
return 0;
}

--
2.17.0
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