linux-kernel - [PATCH v5 03/13] iommu/viommu: Add cache_invalidate to iommufd_viommu

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Message-ID: <e4817b7c2aa58b010a1453a3db9e9804b3acf5dc.1729897278.git.nicolinc@nvidia.com>
Date: Fri, 25 Oct 2024 16:50:32 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
	<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
	<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
	<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
	<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
	<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
	<zhangfei.gao@...aro.org>, <patches@...ts.linux.dev>
Subject: [PATCH v5 03/13] iommu/viommu: Add cache_invalidate to iommufd_viommu_ops

This per-vIOMMU cache_invalidate op is like the cache_invalidate_user op
in struct iommu_domain_ops, but wider, supporting device cache (e.g. PCI
ATC invaldiations).

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 include/linux/iommufd.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index e6cd288e8b83..0287a6d00192 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -15,6 +15,7 @@ struct device;
 struct file;
 struct iommu_group;
 struct iommu_user_data;
+struct iommu_user_data_array;
 struct iommufd_access;
 struct iommufd_ctx;
 struct iommufd_device;
@@ -104,12 +105,21 @@ struct iommufd_viommu {
  *                       must be defined in include/uapi/linux/iommufd.h.
  *                       It must fully initialize the new iommu_domain before
  *                       returning. Upon failure, ERR_PTR must be returned.
+ * @cache_invalidate: Flush hardware cache used by a vIOMMU. It can be used for
+ *                    any IOMMU hardware specific cache: TLB and device cache.
+ *                    The @array passes in the cache invalidation requests, in
+ *                    form of a driver data structure. A driver must update the
+ *                    array->entry_num to report the number of handled requests.
+ *                    The data structure of the array entry must be defined in
+ *                    include/uapi/linux/iommufd.h
  */
 struct iommufd_viommu_ops {
 	void (*free)(struct iommufd_viommu *viommu);
 	struct iommu_domain *(*alloc_domain_nested)(
 		struct iommufd_viommu *viommu,
 		const struct iommu_user_data *user_data);
+	int (*cache_invalidate)(struct iommufd_viommu *viommu,
+				struct iommu_user_data_array *array);
 };
 
 #if IS_ENABLED(CONFIG_IOMMUFD)
-- 
2.43.0