From: Nicolin Chen <nicolinc@nvidia.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "jgg@nvidia.com" <jgg@nvidia.com>,
"will@kernel.org" <will@kernel.org>,
"robin.murphy@arm.com" <robin.murphy@arm.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"ddutile@redhat.com" <ddutile@redhat.com>,
"Liu, Yi L" <yi.l.liu@intel.com>,
"peterz@infradead.org" <peterz@infradead.org>,
"jsnitsel@redhat.com" <jsnitsel@redhat.com>,
"praan@google.com" <praan@google.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"patches@lists.linux.dev" <patches@lists.linux.dev>,
"baolu.lu@linux.intel.com" <baolu.lu@linux.intel.com>
Subject: Re: [PATCH v1 05/12] iommu: Introduce get_viommu_size and viommu_init ops
Date: Thu, 12 Jun 2025 10:06:49 -0700 [thread overview]
Message-ID: <aEsJKZLRTf36Dh3Q@nvidia.com> (raw)
In-Reply-To: <BN9PR11MB5276F17940D4B219D5B4F4BC8C74A@BN9PR11MB5276.namprd11.prod.outlook.com>
On Thu, Jun 12, 2025 at 08:12:29AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc@nvidia.com>
> > Sent: Tuesday, June 10, 2025 1:13 AM
> > + * @get_viommu_size: Get the size of a driver-level vIOMMU structure for a
> > given
> > + * @dev corresponding to @viommu_type. Driver should return
> > an
> > + * errno if vIOMMU isn't supported accordingly. It is required
> > + * for driver to use the VIOMMU_STRUCT_SIZE macro to sanitize
> > + * a driver-level vIOMMU structure related to the core one
>
> What about returning size with '0' indicating NOSUPPORT?
I tend to support other errnos here. Basically this moves all the
driver-level sanity checks from viommu_alloc to get_viommu_size,
to reject an incompatible case immediately before allocating any
structure. And there can be another errno than EOPNOTSUPP.
Thanks
Nicolin
next prev parent reply other threads:[~2025-06-12 17:07 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-09 17:13 [PATCH v1 00/12] iommufd: Repare for IOMMUFD_OBJ_HW_QUEUE Nicolin Chen
2025-06-09 17:13 ` [PATCH v1 01/12] iommufd: Apply obvious cosmetic fixes Nicolin Chen
2025-06-09 17:13 ` [PATCH v1 02/12] iommufd: Drop unused ictx in struct iommufd_vdevice Nicolin Chen
2025-06-12 8:06 ` Tian, Kevin
2025-06-13 13:36 ` Jason Gunthorpe
2025-06-09 17:13 ` [PATCH v1 03/12] iommufd: Use enum iommu_viommu_type for type in struct iommufd_viommu Nicolin Chen
2025-06-12 8:06 ` Tian, Kevin
2025-06-13 13:36 ` Jason Gunthorpe
2025-06-09 17:13 ` [PATCH v1 04/12] iommufd: Use enum iommu_veventq_type for type in struct iommufd_veventq Nicolin Chen
2025-06-12 8:07 ` Tian, Kevin
2025-06-13 13:36 ` Jason Gunthorpe
2025-06-09 17:13 ` [PATCH v1 05/12] iommu: Introduce get_viommu_size and viommu_init ops Nicolin Chen
2025-06-12 8:12 ` Tian, Kevin
2025-06-12 17:06 ` Nicolin Chen [this message]
2025-06-13 7:33 ` Tian, Kevin
2025-06-13 13:41 ` Jason Gunthorpe
2025-06-13 20:45 ` Nicolin Chen
2025-06-09 17:13 ` [PATCH v1 06/12] iommufd/selftest: Implement mock_get_viommu_size and mock_viommu_init Nicolin Chen
2025-06-12 8:17 ` Tian, Kevin
2025-06-12 17:12 ` Nicolin Chen
2025-06-13 7:34 ` Tian, Kevin
2025-06-13 13:45 ` Jason Gunthorpe
2025-06-13 20:19 ` Nicolin Chen
2025-06-13 23:23 ` Jason Gunthorpe
2025-06-13 23:37 ` Nicolin Chen
2025-06-09 17:13 ` [PATCH v1 07/12] iommu/arm-smmu-v3: Implement arm_smmu_get_viommu_size and arm_vsmmu_init Nicolin Chen
2025-06-12 8:20 ` Tian, Kevin
2025-06-12 17:18 ` Nicolin Chen
2025-06-13 7:36 ` Tian, Kevin
2025-06-09 17:13 ` [PATCH v1 08/12] iommufd/viommu: Replace ops->viommu_alloc with ops->viommu_init Nicolin Chen
2025-06-10 5:55 ` Baolu Lu
2025-06-10 6:19 ` Nicolin Chen
2025-06-12 8:22 ` Tian, Kevin
2025-06-12 17:35 ` Nicolin Chen
2025-06-12 8:27 ` Tian, Kevin
2025-06-12 17:24 ` Nicolin Chen
2025-06-09 17:13 ` [PATCH v1 09/12] iommu: Deprecate viommu_alloc op Nicolin Chen
2025-06-12 8:23 ` Tian, Kevin
2025-06-09 17:13 ` [PATCH v1 10/12] iommufd: Move _iommufd_object_alloc out of driver.c Nicolin Chen
2025-06-12 8:23 ` Tian, Kevin
2025-06-13 13:46 ` Jason Gunthorpe
2025-06-09 17:13 ` [PATCH v1 11/12] iommufd: Introduce iommufd_object_alloc_ucmd helper Nicolin Chen
2025-06-13 13:58 ` Jason Gunthorpe
2025-06-13 23:17 ` Nicolin Chen
2025-06-09 17:13 ` [PATCH v1 12/12] iommufd: Apply the new " Nicolin Chen
2025-06-10 18:32 ` [PATCH v1 00/12] iommufd: Repare for IOMMUFD_OBJ_HW_QUEUE Nicolin Chen
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