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Date: Thu, 24 Jul 2008 10:45:49 -0400 From: Prarit Bhargava <prarit@...hat.com> To: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> CC: joro@...tes.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, jbarnes@...tuousgeek.org, ed.pollard@....com, epollard@...hat.com Subject: Re: [PATCH]: PCI: GART iommu alignment fixes [v2] >>> >> >> Yeah, I'm not against fixing IOMMUs to make alloc_consistent return >> the reqeuested size aligned memory. My point is that it's not likely >> to fix anything. Even with the patch, we hit the above problem because >> as I explained, the root cause of the problem is the boundary issue; >> we need to fix pci-dma.c >> >> > > Sorry, I misquoted code up there and was looking for a clear example > of where this would happen. The issue I'm trying to resolve didn't > happen on the skge -- it was just a convenient piece of code to > examine and point out ;) > Here's a case where USB has problems: BIOS-e820: 0000000000000000 - 000000000009f400 (usable) BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved) BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 00000000f57f6800 (reserved) BIOS-e820: 00000000f57f6800 - 00000000f5800000 (ACPI data) BIOS-e820: 00000000f5800000 - 00000000fdc00000 (reserved) BIOS-e820: 00000000fdc00000 - 00000000fdc01000 (reserved) BIOS-e820: 00000000fdc10000 - 00000000fdc01000 (reserved) BIOS-e820: 00000000fdc20000 - 00000000fdc01000 (reserved) BIOS-e820: 00000000fdc30000 - 00000000fdc01000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) BIOS-e820: 00000000fec10000 - 00000000fec20000 (reserved) BIOS-e820: 00000000fec20000 - 00000000fec30000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved) BIOS-e820: 00000000fee10000 - 00000000ff800000 (reserved) BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 00000017fffff000 (usable) I haven't tracked down what pci_alloc_consistent went wrong in usb-storage yet ... it seemed irrelevant because GART was broken. P. -- 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/
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