lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:	Fri, 17 Aug 2007 17:27:27 -0700
From:	akepner@....com
To:	linux-kernel@...r.kernel.org
Cc:	jes@....com, rdreier@...co.com
Subject: [PATCH 0/3] allow drivers to flush in-flight DMA


Altix supports "posted DMA", so that DMA may complete out 
of order. In some cases it's necessary for a driver to 
ensure that in-flight DMA has been flushed to memory for 
correct operation.

In particular this can be a problem with Infiniband, where 
writes to Completion Queues can race with DMA of data.

The following patchset addresses this problem by allowing a 
memory region to be mapped with a "barrier" attribute. (On 
Altix, writes to memory regions with the barrier attribute 
have the side effect that in-flight DMA gets flushed to host 
memory.)

There are three patches in this set:

[1/3] dma: introduce no-op stub "dma_flags_set_dmaflush"
[2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64
[3/3] dma: use dma_flags_set_dmaflush in ib_umem_get 
      (mthca only, for now)

-- 
Arthur

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists