From: Christoph Hellwig <hch@infradead.org>
To: Tom Murphy <tmurphy@arista.com>
Cc: iommu@lists.linux-foundation.org, murphyt7@tcd.ie,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will.deacon@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Kukjin Kim <kgene@kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Andy Gross <andy.gross@linaro.org>,
David Brown <david.brown@linaro.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Rob Clark <robdclark@gmail.com>, Heiko Stuebner <heiko@sntech.de>,
Gerald Schaefer <gerald.schaefer@de.ibm.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-mediatek@lists.infradead.org,
linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org,
linux-tegra@vger.kernel.org
Subject: Re: [PATCH v3 2/4] iommu/dma-iommu: Handle deferred devices
Date: Mon, 6 May 2019 23:40:00 -0700 [thread overview]
Message-ID: <20190507064000.GB5173@infradead.org> (raw)
Message-ID: <20190507064000.KiTPJdNq4mqpJFYRQ3a6jcWNKMT-z8jCWFFjWFXF0RY@z> (raw)
In-Reply-To: <20190506185207.31069-3-tmurphy@arista.com>
On Mon, May 06, 2019 at 07:52:04PM +0100, Tom Murphy wrote:
> +static int handle_deferred_device(struct device *dev)
> +{
> + struct iommu_domain *domain;
> + const struct iommu_ops *ops;
> +
> + if (!is_kdump_kernel())
> + return 0;
> +
> + domain = iommu_get_domain_for_dev(dev);
> - dma_handle =__iommu_dma_map(dev, phys, size,
> + if (unlikely(handle_deferred_device(dev)))
> + return DMA_MAPPING_ERROR;
> +
> + dma_handle = __iommu_dma_map(dev, phys, size,
__iommu_dma_map already looks up the domain, and as far as I can
tell all callers need the handle_deferred_device call. Should we
just move it to there and pass the domain from the caller?
Also shouldn't the iommu_attach_device call inside
handle_deferred_device also get an unlikely marker?
next prev parent reply other threads:[~2019-05-07 6:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-06 18:52 [PATCH v3 0/4] iommu/amd: Convert the AMD iommu driver to the dma-iommu api Tom Murphy via iommu
2019-05-06 18:52 ` Tom Murphy
2019-05-06 18:52 ` [PATCH v3 2/4] iommu/dma-iommu: Handle deferred devices Tom Murphy
2019-05-06 18:52 ` Tom Murphy
2019-05-07 6:40 ` Christoph Hellwig [this message]
2019-05-07 6:40 ` Christoph Hellwig
2019-05-15 12:46 ` Tom Murphy
[not found] ` <20190506185207.31069-1-tmurphy-nzgTgzXrdUbQT0dZR+AlfA@public.gmane.org>
2019-05-06 18:52 ` [PATCH v3 1/4] iommu: Add gfp parameter to iommu_ops::map Tom Murphy via iommu
2019-05-06 18:52 ` Tom Murphy
2019-06-04 18:11 ` Robin Murphy
2019-06-04 20:55 ` Tom Murphy
2019-06-04 21:24 ` Rob Clark
2019-06-05 5:50 ` Christoph Hellwig
2019-05-06 18:52 ` [PATCH v3 3/4] iommu/dma-iommu: Use the dev->coherent_dma_mask Tom Murphy via iommu
2019-05-06 18:52 ` Tom Murphy
2019-05-06 18:52 ` [PATCH v3 4/4] iommu/amd: Convert AMD iommu driver to the dma-iommu api Tom Murphy
2019-05-06 18:52 ` Tom Murphy
2019-06-03 10:51 ` [PATCH v3 0/4] iommu/amd: Convert the " Joerg Roedel
2019-06-03 11:27 ` Tom Murphy
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