From: Dmitry Osipenko Date: Sat, 4 Dec 2021 14:58:48 +0000 (+0300) Subject: gpu: host1x: Add back arm_iommu_detach_device() X-Git-Tag: microblaze-v5.18~28^2~14^2~1 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=d5185965c3b59073c4520bad7dd2adf725b9abba;p=linux-2.6-microblaze.git gpu: host1x: Add back arm_iommu_detach_device() Host1x DMA buffer isn't mapped properly when CONFIG_ARM_DMA_USE_IOMMU=y. The memory management code of Host1x driver has a longstanding overhaul overdue and it's not obvious where the problem is in this case. Hence let's add back the old workaround which we already had sometime before. It explicitly detaches Host1x device from the offending implicit IOMMU domain. This fixes a completely broken Host1x DMA in case of ARM32 multiplatform kernel config. Cc: stable@vger.kernel.org Fixes: af1cbfb9bf0f ("gpu: host1x: Support DMA mapping of buffers") Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding --- diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index 14c1ea7506fb..6994f8c0e02e 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -22,6 +22,10 @@ #include #undef CREATE_TRACE_POINTS +#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) +#include +#endif + #include "bus.h" #include "channel.h" #include "debug.h" @@ -263,6 +267,17 @@ static struct iommu_domain *host1x_iommu_attach(struct host1x *host) struct iommu_domain *domain = iommu_get_domain_for_dev(host->dev); int err; +#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) + if (host->dev->archdata.mapping) { + struct dma_iommu_mapping *mapping = + to_dma_iommu_mapping(host->dev); + arm_iommu_detach_device(host->dev); + arm_iommu_release_mapping(mapping); + + domain = iommu_get_domain_for_dev(host->dev); + } +#endif + /* * We may not always want to enable IOMMU support (for example if the * host1x firewall is already enabled and we don't support addressing