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drm/tegra: Acquire a reference to the IOVA cache 

The IOVA API uses a memory cache to allocate IOVA nodes from. To make
sure that this cache is available, obtain a reference to it and release
the reference when the cache is no longer needed.

On 64-bit ARM this is hidden by the fact that the DMA mapping API gets
that reference and never releases it. On 32-bit ARM, however, the DMA
mapping API doesn't do that, so allocation of IOVA nodes fails.

Fixes: ad92601521 ("drm/tegra: Add Tegra DRM allocation API")
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2018-04-23 08:57:45 +02:00
parent 5f43ac8d80
commit 24cfdc1ac7
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/tegra/drm.c
View File

@ -113,6 +113,10 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
goto free;
}
err = iova_cache_get();
if (err < 0)
goto domain;
geometry = &tegra->domain->geometry;
gem_start = geometry->aperture_start;
gem_end = geometry->aperture_end - CARVEOUT_SZ;
@ -207,8 +211,11 @@ config:
mutex_destroy(&tegra->mm_lock);
drm_mm_takedown(&tegra->mm);
put_iova_domain(&tegra->carveout.domain);
iommu_domain_free(tegra->domain);
iova_cache_put();
}
domain:
if (tegra->domain)
iommu_domain_free(tegra->domain);
free:
kfree(tegra);
return err;
@ -233,6 +240,7 @@ static void tegra_drm_unload(struct drm_device *drm)
mutex_destroy(&tegra->mm_lock);
drm_mm_takedown(&tegra->mm);
put_iova_domain(&tegra->carveout.domain);
iova_cache_put();
iommu_domain_free(tegra->domain);
}