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Thu, 10 Sep 2020 03:53:42 -0400 (EDT) Date: Thu, 10 Sep 2020 09:53:51 +0200 From: Greg KH To: Christoph Hellwig Subject: Re: [PATCH 3/3] dma-mapping: introduce DMA range map, supplanting dma_pfn_offset Message-ID: <20200910075351.GA1092435@kroah.com> References: <20200910054038.324517-1-hch@lst.de> <20200910054038.324517-4-hch@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200910054038.324517-4-hch@lst.de> Cc: devicetree@vger.kernel.org, Florian Fainelli , linux-sh@vger.kernel.org, Frank Rowand , linux-usb@vger.kernel.org, linux-pci@vger.kernel.org, Russell King , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org, Rob Herring , Jim Quinlan , Santosh Shilimkar , Nathan Chancellor , Robin Murphy , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Thu, Sep 10, 2020 at 07:40:38AM +0200, Christoph Hellwig wrote: > From: Jim Quinlan > > The new field 'dma_range_map' in struct device is used to facilitate the > use of single or multiple offsets between mapping regions of cpu addrs and > dma addrs. It subsumes the role of "dev->dma_pfn_offset" which was only > capable of holding a single uniform offset and had no region bounds > checking. > > The function of_dma_get_range() has been modified so that it takes a single > argument -- the device node -- and returns a map, NULL, or an error code. > The map is an array that holds the information regarding the DMA regions. > Each range entry contains the address offset, the cpu_start address, the > dma_start address, and the size of the region. > > of_dma_configure() is the typical manner to set range offsets but there are > a number of ad hoc assignments to "dev->dma_pfn_offset" in the kernel > driver code. These cases now invoke the function > dma_attach_offset_range(dev, cpu_addr, dma_addr, size). So if an error happens, we don't do anything? ice_init(dev->dev); > diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c > index 6197938dcc2d8f..935ee98e049f65 100644 > --- a/drivers/usb/core/message.c > +++ b/drivers/usb/core/message.c > @@ -1956,10 +1956,11 @@ int usb_set_configuration(struct usb_device *dev, int configuration) > intf->dev.groups = usb_interface_groups; > /* > * Please refer to usb_alloc_dev() to see why we set > - * dma_mask and dma_pfn_offset. > + * dma_mask and dma_range_map. > */ > intf->dev.dma_mask = dev->dev.dma_mask; > - intf->dev.dma_pfn_offset = dev->dev.dma_pfn_offset; > + if (dma_direct_copy_range_map(&intf->dev, &dev->dev)) > + dev_err(&dev->dev, "failed to copy DMA map\n"); We tell the user, but then just keep on running? Is there anything that we can do here? If not, why not have dma_direct_copy_range_map() print out the error? thanks, greg k-h _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu