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drm/tegra: Add IOMMU support

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When an IOMMU device is available on the platform bus, allocate an IOMMU
domain and attach the display controllers to it. The display controllers
can then scan out non-contiguous buffers by mapping them through the
IOMMU.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
2014-06-26 21:41:53 +02:00
parent 1d1e6fe9b5
commit df06b759f2
6 changed files with 309 additions and 34 deletions
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24
drivers/gpu/drm/tegra/drm.c
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@@ -8,6 +8,7 @@
*/
#include <linux/host1x.h>
#include <linux/iommu.h>
#include "drm.h"
#include "gem.h"
@@ -33,6 +34,17 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
if (!tegra)
return -ENOMEM;
if (iommu_present(&platform_bus_type)) {
tegra->domain = iommu_domain_alloc(&platform_bus_type);
if (IS_ERR(tegra->domain)) {
err = PTR_ERR(tegra->domain);
goto free;
}
DRM_DEBUG("IOMMU context initialized\n");
drm_mm_init(&tegra->mm, 0, SZ_2G);
}
mutex_init(&tegra->clients_lock);
INIT_LIST_HEAD(&tegra->clients);
drm->dev_private = tegra;
@@ -76,6 +88,12 @@ fbdev:
tegra_drm_fb_free(drm);
config:
drm_mode_config_cleanup(drm);
if (tegra->domain) {
iommu_domain_free(tegra->domain);
drm_mm_takedown(&tegra->mm);
}
free:
kfree(tegra);
return err;
}
@@ -83,6 +101,7 @@ config:
static int tegra_drm_unload(struct drm_device *drm)
{
struct host1x_device *device = to_host1x_device(drm->dev);
struct tegra_drm *tegra = drm->dev_private;
int err;
drm_kms_helper_poll_fini(drm);
@@ -94,6 +113,11 @@ static int tegra_drm_unload(struct drm_device *drm)
if (err < 0)
return err;
if (tegra->domain) {
iommu_domain_free(tegra->domain);
drm_mm_takedown(&tegra->mm);
}
return 0;
}