From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Bottomley <James.Bottomley@HansenPartnership.com>
Subject: Re: [PATCH 0/4] Use of new scsi_allocate_command
Date: Thu, 01 May 2008 10:22:40 -0500
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To: Boaz Harrosh <bharrosh@panasas.com>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>, USB list <linux-usb@vger.kernel.org>, Alan Stern <stern@rowland.harvard.edu>, linux-scsi <linux-scsi@vger.kernel.org>, Andi Kleen <andi@firstfloor.org>

On Thu, 2008-05-01 at 17:56 +0300, Boaz Harrosh wrote:
> The call to pci_map_page() on an ISA case will it not bounce the
> buffer?

Only if the system isn't a PCI_DMA_BUS_IS_PHYS one.

That means basically either has an iommu/gart or has some silly swiotlb
to emulate one.

That means for standard x86 isa systems the answer is no: the buffer has
to be allocated within the isa region because pci_map is simply a
virt_to_phys.

James