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From: Kishon Vijay Abraham I <kishon@ti.com>
To: Christoph Hellwig <hch@lst.de>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: pci-usb/pci-sata broken with LPAE config after "reduce use of block bounce buffers"
Date: Fri, 15 Nov 2019 16:29:31 +0530	[thread overview]
Message-ID: <120f7c3e-363d-deb0-a347-782ac869ee0d@ti.com> (raw)

Hi Christoph,

I think we are encountering a case where the connected PCIe card (like PCIe USB
card) supports 64-bit addressing and the ARM core supports 64-bit addressing
but the PCIe controller in the SoC to which PCIe card is connected supports
only 32-bits.

Here dma APIs can provide an address above the 32 bit region to the PCIe card.
However this will fail when the card tries to access the provided address via
the PCIe controller.

The first commit where we actually start seeing issue is
commit 21e07dba9fb1179148089d611fc9e6e70d1887c3 (j7_serdes_v2)
Author: Christoph Hellwig <hch@lst.de>
Date:   Tue Apr 3 19:09:59 2018 +0200

    scsi: reduce use of block bounce buffers

Can you give hints on how to solve this?

Thanks
Kishon

             reply	other threads:[~2019-11-15 11:00 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-15 10:59 Kishon Vijay Abraham I [this message]
2019-11-15 13:06 ` pci-usb/pci-sata broken with LPAE config after "reduce use of block bounce buffers" Christoph Hellwig
2019-11-15 14:18   ` Kishon Vijay Abraham I
2019-11-16 16:35     ` Christoph Hellwig
2019-11-18 17:21       ` Robin Murphy
2019-11-25  5:43         ` Kishon Vijay Abraham I
2020-01-27 13:10           ` Kishon Vijay Abraham I
2020-01-27 13:22             ` Robin Murphy
2020-01-29  6:24               ` Kishon Vijay Abraham I
2020-01-30  7:58 ` Christoph Hellwig
2020-01-30  8:09   ` Kishon Vijay Abraham I
2020-01-30 16:42     ` Christoph Hellwig
2020-01-31 11:44       ` Kishon Vijay Abraham I
2020-02-03 14:21         ` Christoph Hellwig
2020-02-05  5:15           ` Kishon Vijay Abraham I
2020-02-05  7:47             ` Christoph Hellwig
2020-02-05  8:32               ` Kishon Vijay Abraham I
2020-02-05  8:48                 ` Christoph Hellwig
2020-02-05  9:18                   ` Kishon Vijay Abraham I
2020-02-05  9:19                     ` Christoph Hellwig
2020-02-05  9:33                       ` Kishon Vijay Abraham I
2020-02-05 16:05                         ` Christoph Hellwig
2020-02-17 14:23                           ` Christoph Hellwig
2020-02-18 12:15                             ` Kishon Vijay Abraham I
2020-04-02 12:01                               ` Kishon Vijay Abraham I

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