linux-kernel - [PATCH RFCv1 07/14] iommufd: Add viommu set/unset_dev

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Date: Fri, 12 Apr 2024 20:47:04 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <will@...nel.org>, <robin.murphy@....com>, <jgg@...dia.com>,
	<kevin.tian@...el.com>, <suravee.suthikulpanit@....com>
CC: <joro@...tes.org>, <linux-kernel@...r.kernel.org>,
	<iommu@...ts.linux.dev>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-tegra@...r.kernel.org>, <yi.l.liu@...el.com>, <eric.auger@...hat.com>,
	<vasant.hegde@....com>, <jon.grimm@....com>, <santosh.shukla@....com>,
	<Dhaval.Giani@....com>, <shameerali.kolothum.thodi@...wei.com>
Subject: [PATCH RFCv1 07/14] iommufd: Add viommu set/unset_dev_id ops

Add a pair of ops to set and unet device's virtual ID that belongs to
a viommu object. They will be used, in the following patch, by iommufd
to support some HW-acceleration feature from the host level.

For instance, every device behind an ARM SMMU has a Stream ID. The ID
is used by ATC invalidation commands so SMMU HW can direct invalidation
requests to the corresponding PCI device where the ID belongs to. In a
virtualization use case, a passthroughed device in the VM will have a
virtuail Stream ID, used by the ATC invalidation commands in the guest
system. NVIDIA's CMDQV extension for SMMUv3 provides a v-interface to
execute the guest-level ATC invalidation commands directly, yet needs
the HW to be aware of its virtual Stream ID so it can replace with its
physical Stream ID.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 include/linux/iommufd.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index dec10c6bb261..ca6ac8a1ffd0 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -94,9 +94,13 @@ struct iommufd_viommu {
  * struct iommufd_viommu_ops - viommu specific operations
  * @free: Free all driver-specific parts of an iommufd_viommu. The memory
  *        of the entire viommu will be free-ed by iommufd core
+ * @set/unset_dev_id: set/unset a user space virtual id for a device
  */
 struct iommufd_viommu_ops {
 	void (*free)(struct iommufd_viommu *viommu);
+	int (*set_dev_id)(struct iommufd_viommu *viommu,
+			  struct device *dev, u64 dev_id);
+	void (*unset_dev_id)(struct iommufd_viommu *viommu, struct device *dev);
 };

 #if IS_ENABLED(CONFIG_IOMMUFD)
-- 
2.43.0