From: Alan Stern <stern@rowland.harvard.edu>
To: Christoph Hellwig <hch@lst.de>, Hans de Goede <hdegoede@redhat.com>
Cc: Tom Yan <tom.ty89@gmail.com>,
linux-usb <linux-usb@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
SCSI development list <linux-scsi@vger.kernel.org>
Subject: Re: [PATCH 2/2] usb-storage: revert from scsi_add_host_with_dma() to scsi_add_host()
Date: Mon, 1 Mar 2021 10:59:27 -0500 [thread overview]
Message-ID: <20210301155927.GB1490228@rowland.harvard.edu> (raw)
In-Reply-To: <20210226055352.GA2996@lst.de>
On Fri, Feb 26, 2021 at 06:53:52AM +0100, Christoph Hellwig wrote:
> On Thu, Feb 25, 2021 at 11:35:57AM -0500, Alan Stern wrote:
> > This thread seems to have fallen through the cracks. Maybe now would be
> > a good time to address the problem (since we originally planned to fix
> > it in 5.11!).
> >
> > The questions listed below are pretty self-contained, although the rest
> > of the discussion isn't. But I never received any answers.
>
> usb-storage must use scsi_add_host_with_dma to use the right device
> for DMA mapping and parameters. The calls to set the DMA options
> on the device are needed so that IOMMU merging doesn't change the
> imposed requirements. If these requirements slow you down you need
> to relax them, as apparently the hardware is able to handle bigger
> limits.
Hans, don't you have the right equipment to test this approach?
Alan Stern
next prev parent reply other threads:[~2021-03-01 16:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 11:36 5.10 regression, many XHCI swiotlb buffer is full / DMAR: Device bounce map failed errors on thunderbolt connected XHCI controller Hans de Goede
2020-11-18 21:43 ` Hans de Goede
2020-11-23 14:49 ` Hans de Goede
2020-11-24 10:27 ` Christoph Hellwig
2020-11-24 10:31 ` Hans de Goede
2020-11-24 12:17 ` Mathias Nyman
2020-11-27 11:41 ` Hans de Goede
2020-11-27 12:32 ` 5.10 regression caused by: "uas: fix sdev->host->dma_dev": " Hans de Goede
2020-11-27 16:19 ` Christoph Hellwig
2020-11-27 18:12 ` Hans de Goede
2020-11-28 1:25 ` Tom Yan
2020-11-28 10:43 ` Hans de Goede
2020-11-28 15:48 ` [PATCH 1/2] uas: revert from scsi_add_host_with_dma() to scsi_add_host() Tom Yan
2020-11-28 15:48 ` [PATCH 2/2] usb-storage: " Tom Yan
2020-11-30 9:50 ` Hans de Goede
2020-11-30 12:58 ` Tom Yan
2020-11-30 13:23 ` Hans de Goede
2020-11-30 13:30 ` Greg KH
2020-11-30 13:36 ` Hans de Goede
2020-11-30 13:53 ` Greg KH
2020-11-30 13:55 ` Hans de Goede
2020-12-04 15:02 ` Greg KH
2020-11-30 17:20 ` Alan Stern
2020-11-30 17:24 ` Christoph Hellwig
2020-11-30 18:18 ` Hans de Goede
2020-11-30 18:57 ` Tom Yan
2020-11-30 19:01 ` Tom Yan
2020-11-30 20:36 ` Alan Stern
2021-02-25 16:35 ` Alan Stern
2021-02-26 5:53 ` Christoph Hellwig
2021-03-01 15:59 ` Alan Stern [this message]
2020-11-30 14:39 ` Tom Yan
2020-11-30 9:48 ` [PATCH 1/2] uas: " Hans de Goede
2020-11-30 19:30 ` Tom Yan
2020-12-01 11:09 ` Hans de Goede
2020-11-28 17:15 ` 5.10 regression caused by: "uas: fix sdev->host->dma_dev": many XHCI swiotlb buffer is full / DMAR: Device bounce map failed errors on thunderbolt connected XHCI controller Christoph Hellwig
2020-11-30 8:43 ` Hans de Goede
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