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Diffstat (limited to 'drivers/gpu/drm/tegra/gem.h')
| -rw-r--r-- | drivers/gpu/drm/tegra/gem.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/gem.h b/drivers/gpu/drm/tegra/gem.h index cb5146a67668..bf2cbd48eb3f 100644 --- a/drivers/gpu/drm/tegra/gem.h +++ b/drivers/gpu/drm/tegra/gem.h @@ -32,6 +32,26 @@ struct tegra_bo_tiling { enum tegra_bo_sector_layout sector_layout; }; +/* + * How memory is referenced within a tegra_bo: + * + * Buffer source | Mapping API(*) | Fields + * ---------------+-----------------+--------------- + * Allocated here | DMA API | iova (IOVA mapped to drm->dev), vaddr (CPU VA) + * + * Allocated here | IOMMU API | pages/num_pages (Phys. memory), sgt (Mapped to drm->dev), + * | iova/size (Mapped to domain) + * + * Imported | DMA API | dma_buf (Imported dma_buf) + * + * Imported | IOMMU API | dma_buf (Imported dma_buf), + * | gem->import_attach (Attachment on drm->dev), + * | sgt (Mapped to drm->dev) + * | iova/size (Mapped to domain) + * + * (*) If tegra->domain is set, i.e. TegraDRM IOMMU domain is directly managed through IOMMU API, + * this is IOMMU API. Otherwise DMA API. + */ struct tegra_bo { struct drm_gem_object gem; struct host1x_bo base; @@ -39,6 +59,7 @@ struct tegra_bo { struct sg_table *sgt; dma_addr_t iova; void *vaddr; + struct dma_buf *dma_buf; struct drm_mm_node *mm; unsigned long num_pages; |