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From: Heyi Guo <heyi.guo@linaro.org>
To: "edk2-devel@lists.01.org" <edk2-devel@lists.01.org>,
	Linaro UEFI Mailman List <Linaro-uefi@lists.linaro.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Leif Lindholm <leif.lindholm@linaro.org>,
	"Ni, Ruiyu" <ruiyu.ni@intel.com>
Subject: [RFC] MdeModulePkg/NonDiscoverablePciDeviceDxe: NonCoherentPciIoAllocateBuffer issue with AArch64
Date: Mon, 30 Oct 2017 11:52:29 +0800	[thread overview]
Message-ID: <f1b9be00-4ff3-95f8-c768-750071aaf958@linaro.org> (raw)

Hi folks,

In NonDiscoverablePciDeviceDxe driver, NonCoherentPciIoAllocateBuffer 
may allocate EFI_MEMORY_UC buffer depending on input Attributes and GCD 
capabilities. If it does, it actually allocates memory of "device" type 
in AArch64, but not "normal uncacheable" memory. For "device" memory 
type, it requires restrict access alignment and it may trigger alignment 
fault exception with BaseMemoryLibOptDxe in which read/write alignment 
is not guaranteed.

Is EFI_MOMORY_WC enough for AArch64 platforms? How about other 
platforms, like X86?

Thanks and regards,

Heyi Guo




             reply	other threads:[~2017-10-30  3:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-30  3:52 Heyi Guo [this message]
2017-10-30  8:21 ` [RFC] MdeModulePkg/NonDiscoverablePciDeviceDxe: NonCoherentPciIoAllocateBuffer issue with AArch64 Ard Biesheuvel
2017-10-30 15:13   ` Heyi Guo
2017-10-30 15:17     ` Ard Biesheuvel
2017-10-31 15:25       ` Heyi Guo

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