linux-kernel - [PATCH 1/6] iommu: Add new iommu op to get iommu hardware information

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Message-Id: <20230209041642.9346-2-yi.l.liu@intel.com>
Date:   Wed,  8 Feb 2023 20:16:37 -0800
From:   Yi Liu <yi.l.liu@...el.com>
To:     joro@...tes.org, alex.williamson@...hat.com, jgg@...dia.com,
        kevin.tian@...el.com, robin.murphy@....com
Cc:     cohuck@...hat.com, eric.auger@...hat.com, nicolinc@...dia.com,
        kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
        chao.p.peng@...ux.intel.com, yi.l.liu@...el.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        baolu.lu@...ux.intel.com
Subject: [PATCH 1/6] iommu: Add new iommu op to get iommu hardware information

From: Lu Baolu <baolu.lu@...ux.intel.com>

Introduce a new iommu op get the IOMMU hardware capabilities for iommufd.
This information will be used by any vIOMMU driver which is owned by
userspace.

This op chooses to make the special parameters opaque to the core. This
suits the current usage model where accessing any of the IOMMU device
special parameters does require a userspace driver that matches the kernel
driver. If a need for common parameters, implemented similarly by several
drivers, arises then there is room in the design to grow a generic parameter
set as well. No warpper API is added as it is supposed to be used by
iommufd only.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 include/linux/iommu.h        | 8 ++++++++
 include/uapi/linux/iommufd.h | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index cb586d054c57..97b398d19fd2 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -15,6 +15,7 @@
 #include <linux/of.h>
 #include <linux/ioasid.h>
 #include <uapi/linux/iommu.h>
+#include <uapi/linux/iommufd.h>
 
 #define IOMMU_READ	(1 << 0)
 #define IOMMU_WRITE	(1 << 1)
@@ -223,6 +224,11 @@ struct iommu_iotlb_gather {
 /**
  * struct iommu_ops - iommu ops and capabilities
  * @capable: check capability
+ * @hw_info: IOMMU hardware capabilities. The type of the returned data is
+ *           defined in include/uapi/linux/iommufd.h. The data buffer is
+ *           allocated in the IOMMU driver and the caller should free it
+ *           after use. Return the data buffer if success, or ERR_PTR on
+ *	      failure.
  * @domain_alloc: allocate iommu domain
  * @probe_device: Add device to iommu driver handling
  * @release_device: Remove device from iommu driver handling
@@ -252,6 +258,7 @@ struct iommu_iotlb_gather {
  */
 struct iommu_ops {
 	bool (*capable)(struct device *dev, enum iommu_cap);
+	void *(*hw_info)(struct device *dev, u32 *length);
 
 	/* Domain allocation and freeing by the iommu driver */
 	struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
@@ -280,6 +287,7 @@ struct iommu_ops {
 	void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
 
 	const struct iommu_domain_ops *default_domain_ops;
+	enum iommu_device_data_type driver_type;
 	unsigned long pgsize_bitmap;
 	struct module *owner;
 };
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 98ebba80cfa1..2309edb55028 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -344,4 +344,10 @@ struct iommu_vfio_ioas {
 	__u16 __reserved;
 };
 #define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS)
+
+/**
+ * enum iommu_device_data_type - IOMMU hardware Data types
+ */
+enum iommu_device_data_type {
+};
 #endif
-- 
2.34.1