From: Jason Gunthorpe <jgg@nvidia.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolin Chen <nicolinc@nvidia.com>,
kevin.tian@intel.com, robin.murphy@arm.com, joro@8bytes.org,
will@kernel.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 3/3] iommu: Drop sw_msi from iommu_domain
Date: Mon, 24 Mar 2025 17:05:01 -0300 [thread overview]
Message-ID: <Z+G67avxHQt5L+62@nvidia.com> (raw)
In-Reply-To: <20250324170743.GA1339275@ax162>
On Mon, Mar 24, 2025 at 10:07:43AM -0700, Nathan Chancellor wrote:
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 0f4cc15ded1c..2b81166350ae 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -3661,7 +3661,6 @@ int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
> ret = iommufd_sw_msi(group->domain, desc, msi_addr);
> break;
> default:
> - ret = -EOPNOTSUPP;
> break;
> }
> }
Can we explain why this scenario has a 0 cookie_type?
Actually.. Is it just an identity domain? Nicolin did you test this on
your arm system with a device using identity (iommu=pt kernel param)?
I would expect identity to end up with a 0 cookie because we never
setup dma-iommu.c code on it.
Should we be testing for identity to return 0 instead?
Jason
next prev parent reply other threads:[~2025-03-24 20:05 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-06 21:00 [PATCH v4 0/3] iommu: Clean up cookie and sw_msi in struct iommu_domain Nicolin Chen
2025-03-06 21:00 ` [PATCH v4 1/3] iommu: Sort out domain user data Nicolin Chen
2025-03-07 2:28 ` Baolu Lu
2025-03-07 5:57 ` Nicolin Chen
2025-03-07 7:03 ` Baolu Lu
2025-03-07 11:49 ` Robin Murphy
2025-03-07 15:32 ` Jason Gunthorpe
2025-03-17 19:37 ` Jason Gunthorpe
2025-03-06 21:00 ` [PATCH v4 2/3] iommufd: Move iommufd_sw_msi and related functions to driver.c Nicolin Chen
2025-03-12 7:37 ` Tian, Kevin
2025-03-17 20:20 ` Jason Gunthorpe
2025-03-06 21:00 ` [PATCH v4 3/3] iommu: Drop sw_msi from iommu_domain Nicolin Chen
2025-03-17 20:20 ` Jason Gunthorpe
2025-03-24 16:25 ` Nathan Chancellor
2025-03-24 16:40 ` Jason Gunthorpe
2025-03-24 16:55 ` Nicolin Chen
2025-03-24 17:05 ` Nicolin Chen
2025-03-24 17:07 ` Nathan Chancellor
2025-03-24 20:05 ` Jason Gunthorpe [this message]
2025-03-24 20:43 ` Nathan Chancellor
2025-03-24 21:38 ` Nicolin Chen
2025-03-24 22:29 ` Jason Gunthorpe
2025-03-24 22:45 ` Nicolin Chen
2025-03-17 20:21 ` [PATCH v4 0/3] iommu: Clean up cookie and sw_msi in struct iommu_domain Jason Gunthorpe
2025-03-20 23:16 ` Jason Gunthorpe
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