From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages
Date: Thu, 5 Sep 2013 17:09:05 +0100 [thread overview]
Message-ID: <20130905160905.GI11887@arm.com> (raw)
In-Reply-To: <1377801154-29215-11-git-send-email-stefano.stabellini@eu.citrix.com>
On Thu, Aug 29, 2013 at 07:32:32PM +0100, Stefano Stabellini wrote:
> xen_swiotlb_alloc_coherent needs to allocate a coherent buffer for cpu
> and devices. On native x86 and ARMv8 is sufficient to call
> __get_free_pages in order to get a coherent buffer, while on ARM we need
> to call arm_dma_ops.alloc.
Don't bet on this for ARMv8. It's not mandated for the architecture, so
at some point some SoC will require non-cacheable buffers for coherency.
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"Ian.Campbell@citrix.com" <Ian.Campbell@citrix.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>
Subject: Re: [PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages
Date: Thu, 5 Sep 2013 17:09:05 +0100 [thread overview]
Message-ID: <20130905160905.GI11887@arm.com> (raw)
In-Reply-To: <1377801154-29215-11-git-send-email-stefano.stabellini@eu.citrix.com>
On Thu, Aug 29, 2013 at 07:32:32PM +0100, Stefano Stabellini wrote:
> xen_swiotlb_alloc_coherent needs to allocate a coherent buffer for cpu
> and devices. On native x86 and ARMv8 is sufficient to call
> __get_free_pages in order to get a coherent buffer, while on ARM we need
> to call arm_dma_ops.alloc.
Don't bet on this for ARMv8. It's not mandated for the architecture, so
at some point some SoC will require non-cacheable buffers for coherency.
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: "konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"Ian.Campbell@citrix.com" <Ian.Campbell@citrix.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages
Date: Thu, 5 Sep 2013 17:09:05 +0100 [thread overview]
Message-ID: <20130905160905.GI11887@arm.com> (raw)
In-Reply-To: <1377801154-29215-11-git-send-email-stefano.stabellini@eu.citrix.com>
On Thu, Aug 29, 2013 at 07:32:32PM +0100, Stefano Stabellini wrote:
> xen_swiotlb_alloc_coherent needs to allocate a coherent buffer for cpu
> and devices. On native x86 and ARMv8 is sufficient to call
> __get_free_pages in order to get a coherent buffer, while on ARM we need
> to call arm_dma_ops.alloc.
Don't bet on this for ARMv8. It's not mandated for the architecture, so
at some point some SoC will require non-cacheable buffers for coherency.
--
Catalin
next prev parent reply other threads:[~2013-09-05 16:09 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-29 18:31 [PATCH v5 0/13] enable swiotlb-xen on arm and arm64 Stefano Stabellini
2013-08-29 18:31 ` Stefano Stabellini
2013-08-29 18:31 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 01/13] arm: make SWIOTLB available Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 02/13] arm: introduce a global dma_ops pointer Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-09-02 14:45 ` [Xen-devel] " Julien Grall
2013-09-02 14:45 ` Julien Grall
2013-09-02 14:45 ` Julien Grall
2013-09-05 16:39 ` Stefano Stabellini
2013-09-05 16:39 ` Stefano Stabellini
2013-09-05 16:39 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 03/13] arm64: define DMA_ERROR_CODE Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-09-05 16:05 ` Catalin Marinas
2013-09-05 16:05 ` Catalin Marinas
2013-09-05 16:05 ` Catalin Marinas
2013-09-05 16:54 ` Stefano Stabellini
2013-09-05 16:54 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 04/13] arm64: do not initialize arm64_swiotlb if dma_ops is already set Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 05/13] xen/arm,arm64: move Xen initialization earlier Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 05/13] xen/arm, arm64: " Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 05/13] xen/arm,arm64: " Stefano Stabellini
2013-09-05 16:20 ` Catalin Marinas
2013-09-05 16:20 ` Catalin Marinas
2013-09-05 16:20 ` Catalin Marinas
2013-09-05 16:59 ` Stefano Stabellini
2013-09-05 16:59 ` Stefano Stabellini
2013-09-06 8:58 ` Ian Campbell
2013-09-06 8:58 ` Ian Campbell
2013-09-06 14:09 ` Catalin Marinas
2013-09-06 14:09 ` Catalin Marinas
2013-09-06 14:09 ` Catalin Marinas
2013-09-06 14:23 ` Konrad Rzeszutek Wilk
2013-09-06 14:23 ` Konrad Rzeszutek Wilk
2013-09-06 14:23 ` Konrad Rzeszutek Wilk
2013-09-06 14:53 ` Stefano Stabellini
2013-09-06 14:53 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 06/13] xen: introduce XENMEM_exchange_and_pin and XENMEM_unpin Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 07/13] xen: make xen_create_contiguous_region return the dma address Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-30 13:45 ` Konrad Rzeszutek Wilk
2013-08-30 13:45 ` Konrad Rzeszutek Wilk
2013-08-29 18:32 ` [PATCH v5 08/13] swiotlb-xen: support autotranslate guests Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-30 13:46 ` Konrad Rzeszutek Wilk
2013-08-30 13:46 ` Konrad Rzeszutek Wilk
2013-08-29 18:32 ` [PATCH v5 09/13] xen/arm,arm64: enable SWIOTLB_XEN Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 10/13] swiotlb-xen: introduce xen_swiotlb_set_dma_mask Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-09-05 16:09 ` Catalin Marinas [this message]
2013-09-05 16:09 ` Catalin Marinas
2013-09-05 16:09 ` Catalin Marinas
2013-09-05 16:43 ` Stefano Stabellini
2013-09-05 16:43 ` Stefano Stabellini
2013-09-06 14:14 ` Catalin Marinas
2013-09-06 14:14 ` Catalin Marinas
2013-09-06 14:14 ` Catalin Marinas
2013-09-06 14:59 ` Stefano Stabellini
2013-09-06 14:59 ` Stefano Stabellini
2013-09-06 15:59 ` Catalin Marinas
2013-09-06 15:59 ` Catalin Marinas
2013-09-06 15:59 ` Catalin Marinas
2013-09-06 16:09 ` Stefano Stabellini
2013-09-06 16:09 ` Stefano Stabellini
2013-09-06 16:20 ` Catalin Marinas
2013-09-06 16:20 ` Catalin Marinas
2013-09-06 16:20 ` Catalin Marinas
2013-09-06 16:52 ` Stefano Stabellini
2013-09-06 16:52 ` Stefano Stabellini
2013-09-09 15:51 ` Catalin Marinas
2013-09-09 15:51 ` Catalin Marinas
2013-09-09 16:46 ` Stefano Stabellini
2013-09-09 16:46 ` Stefano Stabellini
2013-09-11 9:36 ` Catalin Marinas
2013-09-11 9:36 ` Catalin Marinas
2013-09-11 9:36 ` Catalin Marinas
2013-09-11 17:34 ` Stefano Stabellini
2013-09-11 17:34 ` Stefano Stabellini
2013-09-12 13:53 ` Catalin Marinas
2013-09-12 13:53 ` Catalin Marinas
2013-09-12 13:53 ` Catalin Marinas
2013-09-12 14:44 ` Stefano Stabellini
2013-09-12 14:44 ` Stefano Stabellini
2013-09-12 15:04 ` Catalin Marinas
2013-09-12 15:04 ` Catalin Marinas
2013-08-29 18:32 ` [PATCH v5 12/13] swiotlb-xen: use xen_alloc/free_coherent_pages Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-30 13:53 ` Konrad Rzeszutek Wilk
2013-08-30 13:53 ` Konrad Rzeszutek Wilk
2013-09-05 16:50 ` Stefano Stabellini
2013-09-05 16:50 ` Stefano Stabellini
2013-09-05 16:50 ` Stefano Stabellini
2013-09-06 14:17 ` Konrad Rzeszutek Wilk
2013-09-06 14:17 ` Konrad Rzeszutek Wilk
2013-09-06 15:04 ` Stefano Stabellini
2013-09-06 15:04 ` Stefano Stabellini
2013-09-06 15:04 ` Stefano Stabellini
2013-08-29 18:32 ` [PATCH v5 13/13] swiotlb: don't assume that io_tlb_start-io_tlb_end is coherent Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
2013-08-29 18:32 ` Stefano Stabellini
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