From: Thierry Reding Date: Mon, 23 Apr 2018 06:57:45 +0000 (+0200) Subject: drm/tegra: Acquire a reference to the IOVA cache X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=24cfdc1ac7d4260aa8416505b9cb6316c9e89021;p=linux.git 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: ad92601521ea ("drm/tegra: Add Tegra DRM allocation API") Reviewed-by: Dmitry Osipenko Tested-by: Dmitry Osipenko Signed-off-by: Thierry Reding --- diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c index 7b9f73bcf1554..3cdef659cd39a 100644 --- a/drivers/gpu/drm/tegra/drm.c +++ b/drivers/gpu/drm/tegra/drm.c @@ -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); }