From: Hillf Danton <hdanton@sina.com>
To: Tom Murphy <murphyt7@tcd.ie>
Cc: Heiko Stuebner <heiko@sntech.de>,
virtualization@lists.linux-foundation.org,
linux-tegra@vger.kernel.org,
Thierry Reding <thierry.reding@gmail.com>,
Will Deacon <will@kernel.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
linux-samsung-soc@vger.kernel.org, Joerg Roedel <joro@8bytes.org>,
iommu@lists.linux-foundation.org,
Krzysztof Kozlowski <krzk@kernel.org>,
Jonathan Hunter <jonathanh@nvidia.com>,
linux-rockchip@lists.infradead.org,
Andy Gross <agross@kernel.org>,
Gerald Schaefer <gerald.schaefer@de.ibm.com>,
linux-s390@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-mediatek@lists.infradead.org,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-arm-kernel@lists.infradead.org,
David Woodhouse <dwmw2@infradead.org>,
linux-kernel@vger.kernel.org, Rob Clark <robdclark@gmail.com>,
Kukjin Kim <kgene@kernel.org>,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH V5 3/5] iommu/dma-iommu: Handle deferred devices
Date: Sat, 17 Aug 2019 11:39:14 +0800 [thread overview]
Message-ID: <20190817033914.4812-1-hdanton@sina.com> (raw)
In-Reply-To: <20190815110944.3579-1-murphyt7@tcd.ie>
On Thu, 15 Aug 2019 12:09:41 +0100 Tom Murphy wrote:
>
> Handle devices which defer their attach to the iommu in the dma-iommu api
>
> Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
> ---
> drivers/iommu/dma-iommu.c | 27 ++++++++++++++++++++++++++-
> 1 file changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index 2712fbc68b28..906b7fa14d3c 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -22,6 +22,7 @@
> #include <linux/pci.h>
> #include <linux/scatterlist.h>
> #include <linux/vmalloc.h>
> +#include <linux/crash_dump.h>
>
> struct iommu_dma_msi_page {
> struct list_head list;
> @@ -351,6 +352,21 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
> return iova_reserve_iommu_regions(dev, domain);
> }
>
> +static int handle_deferred_device(struct device *dev,
> + struct iommu_domain *domain)
> +{
> + const struct iommu_ops *ops = domain->ops;
> +
> + if (!is_kdump_kernel())
> + return 0;
> +
> + if (unlikely(ops->is_attach_deferred &&
> + ops->is_attach_deferred(domain, dev)))
> + return iommu_attach_device(domain, dev);
> +
> + return 0;
> +}
> +
> /**
> * dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API
> * page flags.
> @@ -463,6 +479,9 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
> size_t iova_off = iova_offset(iovad, phys);
> dma_addr_t iova;
>
> + if (unlikely(handle_deferred_device(dev, domain)))
> + return DMA_MAPPING_ERROR;
> +
> size = iova_align(iovad, size + iova_off);
>
> iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
iommu_map_atomic() is applied to __iommu_dma_map() in 2/5.
Is it an atomic context currently given the mutex_lock() in
iommu_attach_device()?
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next prev parent reply other threads:[~2019-08-17 3:40 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-15 11:09 [PATCH V5 0/5] iommu/amd: Convert the AMD iommu driver to the dma-iommu api Tom Murphy
2019-08-15 11:09 ` [PATCH V5 1/5] iommu/amd: Remove unnecessary locking from AMD iommu driver Tom Murphy
2019-08-20 9:41 ` Christoph Hellwig
2019-08-24 7:56 ` Tom Murphy
2019-08-24 22:41 ` Christoph Hellwig
2019-08-15 11:09 ` [PATCH V5 2/5] iommu: Add gfp parameter to iommu_ops::map Tom Murphy
2019-08-19 18:23 ` Robin Murphy
2019-08-20 9:41 ` Christoph Hellwig
2019-08-15 11:09 ` [PATCH V5 3/5] iommu/dma-iommu: Handle deferred devices Tom Murphy
2019-08-19 18:26 ` Robin Murphy
2019-08-20 9:43 ` Christoph Hellwig
2019-08-15 11:09 ` [PATCH V5 4/5] iommu/dma-iommu: Use the dev->coherent_dma_mask Tom Murphy
2019-08-19 18:39 ` Robin Murphy
2019-08-20 9:43 ` Christoph Hellwig
2019-08-15 11:09 ` [PATCH V5 5/5] iommu/amd: Convert AMD iommu driver to the dma-iommu api Tom Murphy
2019-08-17 3:39 ` Hillf Danton [this message]
2019-08-17 7:19 ` [PATCH V5 3/5] iommu/dma-iommu: Handle deferred devices Tom Murphy
2019-09-05 6:18 ` [PATCH V5 0/5] iommu/amd: Convert the AMD iommu driver to the dma-iommu api Christoph Hellwig
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