linux-kernel - [PATCH v3 05/16] iommu/viommu: Add cache_invalidate for IOMMU_VIOMMU_TYPE

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Message-ID: <2b57c2f0721237488d194fb00f9d044d60e3038c.1728491532.git.nicolinc@nvidia.com>
Date: Wed, 9 Oct 2024 09:38:17 -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>,
	<patches@...ts.linux.dev>
Subject: [PATCH v3 05/16] iommu/viommu: Add cache_invalidate for IOMMU_VIOMMU_TYPE_DEFAULT

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 5a630952150d..e58b3e43aa7b 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -14,6 +14,7 @@
 struct device;
 struct file;
 struct iommu_group;
+struct iommu_user_data_array;
 struct iommufd_access;
 struct iommufd_ctx;
 struct iommufd_device;
@@ -95,12 +96,21 @@ struct iommufd_vdevice {
  * @vdevice_free: Free a driver-managed iommufd_vdevice to de-init its structure
  *                or HW procedure. The memory of the vdevice will be free-ed by
  *                iommufd core.
+ * @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 iommufd_vdevice *(*vdevice_alloc)(struct iommufd_viommu *viommu,
 						 struct device *dev, u64 id);
 	void (*vdevice_free)(struct iommufd_vdevice *vdev);
+	int (*cache_invalidate)(struct iommufd_viommu *viommu,
+				struct iommu_user_data_array *array);
 };
 
 #if IS_ENABLED(CONFIG_IOMMUFD)
-- 
2.43.0