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From: Baolu Lu <baolu.lu@linux.intel.com>
To: Robin Murphy <robin.murphy@arm.com>, joro@8bytes.org, will@kernel.org
Cc: baolu.lu@linux.intel.com, hch@lst.de, jgg@nvidia.com,
	iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH 6/8] iommu: Retire bus ops
Date: Fri, 20 Jan 2023 08:27:08 +0800	[thread overview]
Message-ID: <d798bc7b-a87a-26b2-17e0-48e9c7715abc@linux.intel.com> (raw)
In-Reply-To: <a2db51f8f417bbe0032e2c4231579f8c4ce9a089.1673978700.git.robin.murphy@arm.com>

On 2023/1/20 3:18, Robin Murphy wrote:
> +	/*
> +	 * For FDT-based systems and ACPI IORT/VIOT, drivers register IOMMU
> +	 * instances with non-NULL fwnodes, and client devices should have been
> +	 * identified with a fwspec by this point. For Intel/AMD/s390/PAMU we
> +	 * can assume a single active driver with global ops, and so grab those
> +	 * from any registered instance, cheekily co-opting the same mechanism.
> +	 */
> +	fwspec = dev_iommu_fwspec_get(dev);
> +	if (fwspec && fwspec->ops)
> +		ops = fwspec->ops;
> +	else
> +		ops = iommu_ops_from_fwnode(NULL);

I'm imagining if Intel/AMD/s390 drivers need to give up global ops.
Is there any way to allow them to make such conversion? I am just
thinking about whether this is a hard limitation for these drivers.

Best regards,
baolu

  reply	other threads:[~2023-01-20  5:02 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-19 19:18 [PATCH 0/8] iommu: The early demise of bus ops Robin Murphy
2023-01-19 19:18 ` [PATCH 1/8] iommu: Decouple iommu_present() from " Robin Murphy
2023-01-26 13:13   ` Baolu Lu
2023-01-26 14:21     ` Robin Murphy
2023-01-26 14:41       ` Jason Gunthorpe
2023-01-27 13:50         ` Baolu Lu
2023-01-27 13:59           ` Jason Gunthorpe
2023-01-27 15:19           ` Robin Murphy
2023-01-27 15:43             ` Jason Gunthorpe
2023-01-28  8:49               ` Baolu Lu
2023-01-30 13:49                 ` Robin Murphy
2023-01-30 13:53                   ` Jason Gunthorpe
2023-01-30 14:22                     ` Oded Gabbay
2023-01-19 19:18 ` [PATCH 2/8] iommu: Validate that devices match domains Robin Murphy
2023-01-19 19:18 ` [PATCH 3/8] iommu: Factor out a "first device in group" helper Robin Murphy
2023-01-19 19:23   ` Jason Gunthorpe
2023-01-19 19:36     ` Robin Murphy
2023-01-19 19:18 ` [PATCH 4/8] iommu: Switch __iommu_domain_alloc() to device ops Robin Murphy
2023-01-19 19:26   ` Jason Gunthorpe
2023-01-19 20:12     ` Robin Murphy
2023-01-19 19:18 ` [PATCH 5/8] iommu/arm-smmu: Don't register fwnode for legacy binding Robin Murphy
2023-01-19 19:18 ` [PATCH 6/8] iommu: Retire bus ops Robin Murphy
2023-01-20  0:27   ` Baolu Lu [this message]
2023-01-20 12:31     ` Robin Murphy
2023-01-26 12:37       ` Baolu Lu
2023-01-20 10:23   ` Greg Kroah-Hartman
2023-01-19 19:18 ` [PATCH 7/8] iommu: Clean up open-coded ownership checks Robin Murphy
2023-01-19 19:31   ` Jason Gunthorpe
2023-01-19 20:52     ` Robin Murphy
2023-01-19 19:18 ` [PATCH 8/8] iommu: Pass device through ops->domain_alloc Robin Murphy
2023-01-19 19:34 ` [PATCH 0/8] iommu: The early demise of bus ops Jason Gunthorpe
2023-01-20 12:33 ` Joerg Roedel

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