linux-kernel - [PATCH v2 0/2] Use right iommu

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Date: Fri, 26 Jan 2024 18:53:39 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Jason Gunthorpe <jgg@...pe.ca>,
	Kevin Tian <kevin.tian@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>
Cc: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v2 0/2] Use right iommu_ops for mock device

In the iommu probe device path, __iommu_probe_device() gets the iommu_ops
for the device from dev->iommu->fwspec if this field has been initialized
before probing. Otherwise, it will lookup the global iommu device list
and use the iommu_ops of the first iommu device which has no
dev->iommu->fwspec. This causes the wrong iommu_ops to be used for the mock
device on x86 platforms where dev->iommu->fwspec is not used.

Probe the right iommu_ops for device by iterating over all the global
drivers and calling their probe function to find a match.

Change log:
v2:
 - Iterate over all the global iommu drivers and calling their probe
   function to find a match.

v1: https://lore.kernel.org/linux-iommu/20240111073213.180020-1-baolu.lu@linux.intel.com/

Lu Baolu (2):
  iommu: Use mutex instead of spinlock for iommu_device_list
  iommu: Probe right iommu_ops for device

 drivers/iommu/iommu.c | 98 ++++++++++++++++++++++++++-----------------
 1 file changed, 59 insertions(+), 39 deletions(-)

-- 
2.34.1