linux-kernel - RE: [PATCH v12 4/5] iommu/vt-d: pass pdev parameter for qi_check

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Date: Mon, 29 Jan 2024 08:58:25 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Ethan Zhao <haifeng.zhao@...ux.intel.com>, "baolu.lu@...ux.intel.com"
	<baolu.lu@...ux.intel.com>, "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"robin.murphy@....com" <robin.murphy@....com>, "jgg@...pe.ca" <jgg@...pe.ca>
CC: "dwmw2@...radead.org" <dwmw2@...radead.org>, "will@...nel.org"
	<will@...nel.org>, "lukas@...ner.de" <lukas@...ner.de>, "Liu, Yi L"
	<yi.l.liu@...el.com>, "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: RE: [PATCH v12 4/5] iommu/vt-d: pass pdev parameter for
 qi_check_fault() and refactor callers

> From: Ethan Zhao <haifeng.zhao@...ux.intel.com>
> Sent: Monday, January 29, 2024 11:49 AM
> 
> to check state of ATS capable pci device in qi_check_fault() for surprise
> removal case, we need to pass the target pci device of ATS invalidation
> request to qi_check_fault(). if pdev is valid, means current request is for
> ATS invalidation, vice vesa.
> 
> no function change.

qi_submit_sync() is used for all kinds of iotlb/cache/devtlb invalidations.
it's a bit weird to see a device pointer (even being NULL) in places where
a device doesn't even matter.

having a new qi_submit_sync_devtlb() wrapper sounds cleaner to me,
with an internal __qi_submit_sync() helper to accept a device pointer.

qi_submit_sync() calls __qi_submit_sync() with a null device pointer then
non-devtlb paths are intact.