From: Christoph Hellwig <hch@infradead.org>
To: James Sewart <jamessewart@arista.com>
Cc: Alex Williamson <alex.williamson@redhat.com>,
Dmitry Safonov <dima@arista.com>,
linux-pci@vger.kernel.org, Dmitry Safonov <0x7f454c46@gmail.com>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
Bjorn Helgaas <helgaas@kernel.org>,
Logan Gunthorpe <logang@deltatee.com>
Subject: Re: [PATCH v2] PCI: Add DMA alias quirk for PLX PEX NTB
Date: Tue, 26 Nov 2019 09:38:33 -0800 [thread overview]
Message-ID: <20191126173833.GA16069@infradead.org> (raw)
In-Reply-To: <6A902F0D-FE98-4760-ADBB-4D5987D866BE@arista.com>
> +int _pci_add_dma_alias_range(struct pci_dev *dev, u8 devfn_from, int len)
This should be mrked static. Also single underscore prefixes are rather
unusual in Linux. Either use two or use a more descriptive name.
> @@ -5875,18 +5887,21 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode,
> */
> void pci_add_dma_alias(struct pci_dev *dev, u8 devfn)
> {
> - if (!dev->dma_alias_mask)
> - dev->dma_alias_mask = bitmap_zalloc(U8_MAX, GFP_KERNEL);
> - if (!dev->dma_alias_mask) {
> - pci_warn(dev, "Unable to allocate DMA alias mask\n");
> + if (_pci_add_dma_alias_range(dev, devfn, 1) != 0)
> return;
> - }
> -
> - set_bit(devfn, dev->dma_alias_mask);
> pci_info(dev, "Enabling fixed DMA alias to %02x.%d\n",
> PCI_SLOT(devfn), PCI_FUNC(devfn));
> }
>
> +void pci_add_dma_alias_range(struct pci_dev *dev, u8 devfn_from, int len)
> +{
> + int devfn_to = devfn_from + len - 1;
> + if (_pci_add_dma_alias_range(dev, devfn_from, len) != 0)
> + return;
> + pci_info(dev, "Enabling fixed DMA alias for devfn range from %02x.%d to %02x.%d\n",
> + PCI_SLOT(devfn_from), PCI_FUNC(devfn_from), PCI_SLOT(devfn_to), PCI_FUNC(devfn_to));
> +}
This adds a non-string constant line over 80 chars that should be fixed
up.
But can't you just add the len argument (which really should be
nr_devfns or so) to pci_add_dma_alias and switch the 8 existing
callers over?
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next prev parent reply other threads:[~2019-11-26 17:38 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 12:52 [PATCH] Ensure pci transactions coming from PLX NTB are handled when IOMMU is turned on James Sewart via iommu
2019-11-05 12:17 ` James Sewart via iommu
2019-11-20 17:48 ` Dmitry Safonov
2019-11-20 19:30 ` Logan Gunthorpe
2019-11-20 19:49 ` Bjorn Helgaas
2019-11-20 19:32 ` Bjorn Helgaas
2019-11-26 17:03 ` [PATCH v2] PCI: Add DMA alias quirk for PLX PEX NTB James Sewart via iommu
2019-11-26 17:06 ` Logan Gunthorpe
2019-11-26 17:36 ` [PATCH v3 1/2] PCI: Add helper pci_add_dma_alias_range James Sewart via iommu
2019-11-26 17:37 ` [PATCH v3 2/2] PCI: Add DMA alias quirk for PLX PEX NTB James Sewart via iommu
2019-11-26 17:38 ` Christoph Hellwig [this message]
2019-11-27 13:27 ` [PATCH v3 1/2] PCI: Add parameter nr_devfns to pci_add_dma_alias James Sewart via iommu
2019-11-27 13:28 ` [PATCH v3 2/2] PCI: Add DMA alias quirk for PLX PEX NTB James Sewart via iommu
2019-11-27 17:38 ` [PATCH v3 1/2] PCI: Add parameter nr_devfns to pci_add_dma_alias Logan Gunthorpe
2019-11-29 12:49 ` [PATCH v4 " James Sewart via iommu
2019-11-29 12:49 ` [PATCH v4 2/2] PCI: Add DMA alias quirk for PLX PEX NTB James Sewart via iommu
2019-11-29 16:50 ` [PATCH v4 1/2] PCI: Add parameter nr_devfns to pci_add_dma_alias Logan Gunthorpe
2019-11-29 17:19 ` James Sewart via iommu
2019-11-29 17:26 ` Logan Gunthorpe
2019-11-29 17:56 ` [PATCH v5 1/3] PCI: Fix off by one in dma_alias_mask allocation size James Sewart via iommu
2019-11-29 17:56 ` [PATCH v5 2/3] PCI: Add parameter nr_devfns to pci_add_dma_alias James Sewart via iommu
2019-11-29 17:57 ` [PATCH v5 3/3] PCI: Add DMA alias quirk for PLX PEX NTB James Sewart via iommu
2019-12-02 17:03 ` [PATCH v5 2/3] PCI: Add parameter nr_devfns to pci_add_dma_alias Christoph Hellwig
2019-11-29 17:58 ` [PATCH v5 1/3] PCI: Fix off by one in dma_alias_mask allocation size Logan Gunthorpe
2019-12-02 17:03 ` Christoph Hellwig
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