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Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing

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From: FUJITA Tomonori
Subject: Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing
Date: Friday, September 19, 2008 - 11:40 am

On Fri, 19 Sep 2008 19:43:39 +0200
Joerg Roedel <joro@8bytes.org> wrote:


nofullflush is pointless. It doesn't change any kernel behavior. Yes,
GART has it and we can't remove it because we exported it to
users. But please don't add such pointless option to the generic
options just for GART compatibility.

fullflush might be useful as a generic option to disable lazy IOTLB
flushing. But I'm not sure that Calgary uses it. VT-d already has
'strict' option for it and we can't change it. If VT-d wants to
support both 'strict' and 'fullflush' for disabling lazy IOTLB
flushing, it would make sense. But if VT-d doesn't want, it is useful
only for GART and AMD IOMMU. If so, I don't think that it is very
useful but I'm not against adding it.
--
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Messages in current thread:
[PATCH 0/23] AMD IOMMU 2.6.28 updates for review, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 01/23] AMD IOMMU: check for invalid device pointers, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 02/23] AMD IOMMU: move TLB flushing to the map/unma ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 04/23] AMD IOMMU: add branch hints to completion wa ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 05/23] AMD IOMMU: align alloc_coherent addresses pr ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 06/23] AMD IOMMU: add event buffer allocation, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 07/23] AMD IOMMU: save pci segment from ACPI tables, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 08/23] AMD IOMMU: save pci_dev instead of devid, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 09/23] AMD IOMMU: add MSI interrupt support, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 10/23] AMD IOMMU: add event handling code, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 11/23] AMD IOMMU: enable event logging, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 12/23] AMD IOMMU: allow IO page faults from devices, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 13/23] AMD IOMMU: add dma_supported callback, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 14/23] AMD IOMMU: don't assing preallocated protect ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 15/23] AMD IOMMU: some set_device_domain cleanups, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 16/23] AMD IOMMU: avoid unnecessary low zone alloca ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 17/23] AMD IOMMU: replace memset with __GFP_ZERO in ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 18/23] AMD IOMMU: simplify dma_mask_to_pages, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 19/23] AMD IOMMU: free domain bitmap with its alloc ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 20/23] AMD IOMMU: remove unnecessary cast to u64 in ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 21/23] AMD IOMMU: calculate IVHD size with a function, Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 22/23] AMD IOMMU: use cmd_buf_size when freeing the ..., Joerg Roedel, (Wed Sep 17, 9:52 am)
[PATCH 23/23] add AMD IOMMU tree to MAINTAINERS file, Joerg Roedel, (Wed Sep 17, 9:52 am)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, FUJITA Tomonori, (Wed Sep 17, 12:20 pm)
Re: [PATCH 18/23] AMD IOMMU: simplify dma_mask_to_pages, FUJITA Tomonori, (Wed Sep 17, 12:20 pm)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Joerg Roedel, (Wed Sep 17, 12:28 pm)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, FUJITA Tomonori, (Wed Sep 17, 6:29 pm)
Re: [PATCH 18/23] AMD IOMMU: simplify dma_mask_to_pages, Joerg Roedel, (Thu Sep 18, 12:32 am)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Joerg Roedel, (Thu Sep 18, 3:13 am)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Joerg Roedel, (Thu Sep 18, 7:03 am)
Re: [PATCH 18/23] AMD IOMMU: simplify dma_mask_to_pages, FUJITA Tomonori, (Thu Sep 18, 8:57 am)
Re: [PATCH 18/23] AMD IOMMU: simplify dma_mask_to_pages, Joerg Roedel, (Thu Sep 18, 9:39 am)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, FUJITA Tomonori, (Thu Sep 18, 4:10 pm)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Joerg Roedel, (Thu Sep 18, 11:29 pm)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, FUJITA Tomonori, (Fri Sep 19, 3:21 am)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Joerg Roedel, (Fri Sep 19, 10:43 am)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, FUJITA Tomonori, (Fri Sep 19, 11:40 am)
RE: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Keshavamurthy, Anil S, (Fri Sep 19, 11:47 am)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Joerg Roedel, (Fri Sep 19, 12:27 pm)
Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing, Muli Ben-Yehuda, (Sat Sep 20, 10:27 pm)