From: Florian Fainelli <f.fainelli@gmail.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: "open list:SWIOTLB SUBSYSTEM" <iommu@lists.linux-foundation.org>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] swiotlb: Make SWIOTLB_NO_FORCE perform no allocation
Date: Fri, 9 Apr 2021 13:33:05 -0700 [thread overview]
Message-ID: <6bb1088e-f502-951b-ab0f-cfc872834a5e@gmail.com> (raw)
In-Reply-To: <YHCr2ziJxmISCcEW@Konrads-MacBook-Pro.local>
On 4/9/2021 12:32 PM, Konrad Rzeszutek Wilk wrote:
> On Thu, Apr 08, 2021 at 08:13:07PM -0700, Florian Fainelli wrote:
>>
>>
>> On 3/24/2021 1:42 AM, Christoph Hellwig wrote:
>>> On Mon, Mar 22, 2021 at 06:53:49PM -0700, Florian Fainelli wrote:
>>>> When SWIOTLB_NO_FORCE is used, there should really be no allocations of
>>>> default_nslabs to occur since we are not going to use those slabs. If a
>>>> platform was somehow setting swiotlb_no_force and a later call to
>>>> swiotlb_init() was to be made we would still be proceeding with
>>>> allocating the default SWIOTLB size (64MB), whereas if swiotlb=noforce
>>>> was set on the kernel command line we would have only allocated 2KB.
>>>>
>>>> This would be inconsistent and the point of initializing default_nslabs
>>>> to 1, was intended to allocate the minimum amount of memory possible, so
>>>> simply remove that minimal allocation period.
>>>>
>>>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>>>
>>> Looks good,
>>>
>>> Reviewed-by: Christoph Hellwig <hch@lst.de>
>>>
>>
>> Thanks! Konrad, can you apply this patch to your for-linus-5.13 branch
>> if you are also happy with it?
>
> It should be now visible?
Not seeing it here:
https://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb.git/log/?h=devel/for-linus-5.13
--
Florian
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prev parent reply other threads:[~2021-04-09 20:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-18 19:18 [PATCH] swiotlb: Add swiotlb=off to disable SWIOTLB Florian Fainelli
2021-03-18 19:22 ` Florian Fainelli
2021-03-18 19:34 ` Robin Murphy
2021-03-18 19:43 ` Florian Fainelli
2021-03-18 19:53 ` Robin Murphy
2021-03-18 21:31 ` Florian Fainelli
2021-03-18 23:35 ` Robin Murphy
2021-03-19 0:48 ` Florian Fainelli
2021-03-19 2:34 ` Konrad Rzeszutek Wilk
2021-03-19 4:00 ` [PATCH] swiotlb: Make SWIOTLB_NO_FORCE perform no allocation Florian Fainelli
2021-03-19 5:01 ` Konrad Rzeszutek Wilk
2021-03-21 3:37 ` [PATCH v2] " Florian Fainelli
2021-03-22 7:46 ` Christoph Hellwig
2021-03-23 1:53 ` [PATCH v3] " Florian Fainelli
2021-03-24 8:42 ` Christoph Hellwig
2021-04-09 3:13 ` Florian Fainelli
2021-04-09 19:32 ` Konrad Rzeszutek Wilk
2021-04-09 20:33 ` Florian Fainelli [this message]
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