linux-kernel - Re: [PATCH v2] iommu/vt-d: Allocate DMAR fault interrupts locally

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Date: Mon, 8 Apr 2024 15:21:56 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: "Tian, Kevin" <kevin.tian@...el.com>, Dimitri Sivanich
 <sivanich@....com>, Thomas Gleixner <tglx@...utronix.de>,
 Joerg Roedel <joro@...tes.org>,
 Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 David Woodhouse <dwmw2@...radead.org>, Mark Rutland <mark.rutland@....com>,
 Peter Zijlstra <peterz@...radead.org>, Arnd Bergmann <arnd@...db.de>,
 YueHaibing <yuehaibing@...wei.com>,
 "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
Cc: baolu.lu@...ux.intel.com,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Steve Wahl <steve.wahl@....com>, "Anderson, Russ" <russ.anderson@....com>,
 Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v2] iommu/vt-d: Allocate DMAR fault interrupts locally

On 2024/4/8 14:54, Tian, Kevin wrote:
>> From: Dimitri Sivanich <sivanich@....com>
>> Sent: Friday, March 22, 2024 4:51 AM
>>
>> The Intel IOMMU code currently tries to allocate all DMAR fault interrupt
>> vectors on the boot cpu.  On large systems with high DMAR counts this
>> results in vector exhaustion, and most of the vectors are not initially
>> allocated socket local.
>>
>> Instead, have a cpu on each node do the vector allocation for the DMARs on
>> that node.  The boot cpu still does the allocation for its node during its
>> boot sequence.
>>
>> Signed-off-by: Dimitri Sivanich <sivanich@....com>
> 
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> 

Kevin,

Jacob has another proposal which shares the irq among all IOMMUs.

https://lore.kernel.org/linux-iommu/20240403234548.989061-1-jacob.jun.pan@linux.intel.com/

How do you like this?

Best regards,
baolu