2017년 11월 22일 22:14에 Marek Szyprowski 이(가) 쓴 글:
When no IOMMU is available, all GEM buffers allocated by Exynos DRM driver are contiguous, because of the underlying dma_alloc_attrs() function provides only such buffers. In such case it makes no sense to keep BO_NONCONTIG flag for the allocated GEM buffers. This allows to avoid failures for buffer contiguity checks in the subsequent operations on GEM objects.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com CC: stable@vger.kernel.org # v4.4+
This issue is there since commit 0519f9a12d011 ("drm/exynos: add iommu support for exynos drm framework"), but this patch applies cleanly only to v4.4+ kernel releases due changes in the surrounding code.
Changelog: v2:
- added warning message when buffer flags are updadated (requested by Inki)
v1: https://patchwork.kernel.org/patch/10034919/
- initial version
drivers/gpu/drm/exynos/exynos_drm_gem.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index 077de014d610..4400efe3974a 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -247,6 +247,15 @@ struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev, if (IS_ERR(exynos_gem)) return exynos_gem;
- if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
/** when no IOMMU is available, all allocated buffers are* contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag*/flags &= ~EXYNOS_BO_NONCONTIG;DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
WARNING: line over 80 characters
I wil change above a warning like below if you are ok, DRM_WARN("Changed to CONTIG buffer due to no IOMMU support.\n");
Thanks, Inki Dae
- }
- /* set memory type and cache attribute from user side. */ exynos_gem->flags = flags;