From: Lu Baolu <baolu.lu@linux.intel.com>
To: Jon Derrick <jonathan.derrick@intel.com>,
linux-pci@vger.kernel.org, Bjorn Helgaas <helgaas@kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: iommu@lists.linux-foundation.org, Keith Busch <kbusch@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v4 4/7] iommu/vt-d: Use pci_real_dma_dev() for mapping
Date: Tue, 21 Jan 2020 09:06:28 +0800 [thread overview]
Message-ID: <88149be1-1e5d-f0d2-ba5d-6e979014f11e@linux.intel.com> (raw)
In-Reply-To: <1579278449-174098-5-git-send-email-jonathan.derrick@intel.com>
Hi,
On 1/18/20 12:27 AM, Jon Derrick wrote:
> The PCI device may have a DMA requester on another bus, such as VMD
> subdevices needing to use the VMD endpoint. This case requires the real
> DMA device when mapping to IOMMU.
>
> Signed-off-by: Jon Derrick<jonathan.derrick@intel.com>
> ---
> drivers/iommu/intel-iommu.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 0c8d81f..01a1b0f 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -782,6 +782,8 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
> return NULL;
> #endif
>
> + pdev = pci_real_dma_dev(dev);
This isn't correct. It will result in a compiling error when bisect.
Best regards,
baolu
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next prev parent reply other threads:[~2020-01-21 1:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 16:27 [PATCH v4 0/7] Clean up VMD DMA Map Ops Jon Derrick
2020-01-17 16:27 ` [PATCH v4 1/7] x86/PCI: Add a to_pci_sysdata helper Jon Derrick
2020-01-17 16:27 ` [PATCH v4 2/7] x86/PCI: Expose VMD's PCI Device in pci_sysdata Jon Derrick
2020-01-17 16:27 ` [PATCH v4 3/7] PCI: Introduce pci_real_dma_dev() Jon Derrick
2020-01-17 16:27 ` [PATCH v4 4/7] iommu/vt-d: Use pci_real_dma_dev() for mapping Jon Derrick
2020-01-19 22:18 ` Christoph Hellwig
2020-01-21 1:06 ` Lu Baolu [this message]
2020-01-21 1:22 ` Derrick, Jonathan
2020-01-17 16:27 ` [PATCH v4 5/7] iommu/vt-d: Remove VMD child device sanity check Jon Derrick
2020-01-17 16:27 ` [PATCH v4 6/7] PCI: vmd: Stop overriding dma_map_ops Jon Derrick
2020-01-20 10:58 ` Lorenzo Pieralisi
2020-01-17 16:27 ` [PATCH v4 7/7] x86/PCI: Remove X86_DEV_DMA_OPS Jon Derrick
2020-01-19 22:25 ` [PATCH v4 0/7] Clean up VMD DMA Map Ops Christoph Hellwig
2020-01-20 11:02 ` Lorenzo Pieralisi
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