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From: Robin Murphy <robin.murphy@arm.com>
To: Christoph Hellwig <hch@lst.de>, Dongli Zhang <dongli.zhang@oracle.com>
Cc: ulf.hansson@linaro.org, airlied@linux.ie,
	benh@kernel.crashing.org, joonas.lahtinen@linux.intel.com,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	bhelgaas@google.com, paulus@samba.org, hpa@zytor.com,
	mingo@kernel.org, m.szyprowski@samsung.com,
	sstabellini@kernel.org, adrian.hunter@intel.com,
	mpe@ellerman.id.au, x86@kernel.org, joe.jin@oracle.com,
	peterz@infradead.org, mingo@redhat.com, bskeggs@redhat.com,
	linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org,
	matthew.auld@intel.com, thomas.lendacky@amd.com,
	konrad.wilk@oracle.com, intel-gfx@lists.freedesktop.org,
	jani.nikula@linux.intel.com, bp@alien8.de,
	rodrigo.vivi@intel.com, nouveau@lists.freedesktop.org,
	Claire Chang <tientzu@chromium.org>,
	boris.ostrovsky@oracle.com, chris@chris-wilson.co.uk,
	jgross@suse.com, tsbogend@alpha.franken.de,
	linux-mmc@vger.kernel.org, linux-mips@vger.kernel.org,
	iommu@lists.linux-foundation.org, tglx@linutronix.de,
	bauerman@linux.ibm.com, daniel@ffwll.ch,
	akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
	rppt@kernel.org
Subject: Re: [Nouveau] [PATCH RFC v1 2/6] swiotlb: convert variables to arrays
Date: Thu, 4 Feb 2021 11:49:23 +0000
Message-ID: <b46ddefe-d91a-fa6a-0e0d-cf1edc343c2e@arm.com> (raw)
In-Reply-To: <20210204072947.GA29812@lst.de>

On 2021-02-04 07:29, Christoph Hellwig wrote:
> On Wed, Feb 03, 2021 at 03:37:05PM -0800, Dongli Zhang wrote:
>> This patch converts several swiotlb related variables to arrays, in
>> order to maintain stat/status for different swiotlb buffers. Here are
>> variables involved:
>>
>> - io_tlb_start and io_tlb_end
>> - io_tlb_nslabs and io_tlb_used
>> - io_tlb_list
>> - io_tlb_index
>> - max_segment
>> - io_tlb_orig_addr
>> - no_iotlb_memory
>>
>> There is no functional change and this is to prepare to enable 64-bit
>> swiotlb.
> 
> Claire Chang (on Cc) already posted a patch like this a month ago,
> which looks much better because it actually uses a struct instead
> of all the random variables.

Indeed, I skimmed the cover letter and immediately thought that this 
whole thing is just the restricted DMA pool concept[1] again, only from 
a slightly different angle.

Robin.

[1] 
https://lore.kernel.org/linux-iommu/20210106034124.30560-1-tientzu@chromium.org/
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Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-03 23:37 [Nouveau] [PATCH RFC v1 0/6] swiotlb: 64-bit DMA buffer Dongli Zhang
2021-02-03 23:37 ` [Nouveau] [PATCH RFC v1 1/6] swiotlb: define new enumerated type Dongli Zhang
2021-02-03 23:37 ` [Nouveau] [PATCH RFC v1 2/6] swiotlb: convert variables to arrays Dongli Zhang
2021-02-04  7:29   ` Christoph Hellwig
2021-02-04 11:49     ` Robin Murphy [this message]
2021-02-04 19:31       ` Konrad Rzeszutek Wilk
2021-02-03 23:37 ` [Nouveau] [PATCH RFC v1 3/6] swiotlb: introduce swiotlb_get_type() to calculate swiotlb buffer type Dongli Zhang
2021-02-03 23:37 ` [Nouveau] [PATCH RFC v1 4/6] swiotlb: enable 64-bit swiotlb Dongli Zhang
2021-02-03 23:37 ` [Nouveau] [PATCH RFC v1 5/6] xen-swiotlb: convert variables to arrays Dongli Zhang
2021-02-04  8:40   ` Christoph Hellwig
2021-02-07 15:56     ` Christoph Hellwig
2021-02-19 20:32       ` Konrad Rzeszutek Wilk
2021-02-19 23:59         ` Boris Ostrovsky
2021-02-23  1:22         ` Stefano Stabellini
2021-02-03 23:37 ` [Nouveau] [PATCH RFC v1 6/6] xen-swiotlb: enable 64-bit xen-swiotlb Dongli Zhang

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