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From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: iommu@lists.linux-foundation.org,
	LKML <linux-kernel@vger.kernel.org>,
	Joerg Roedel <joro@8bytes.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alex Williamson <alex.williamson@redhat.com>,
	Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Cc: Rafael Wysocki <rafael.j.wysocki@intel.com>,
	"Liu, Yi L" <yi.l.liu@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	Raj Ashok <ashok.raj@intel.com>,
	Jean Delvare <khali@linux-fr.org>,
	"Christoph Hellwig" <hch@infradead.org>,
	"Lu Baolu" <baolu.lu@linux.intel.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Liu, Yi L <yi.l.liu@linux.intel.com>
Subject: [PATCH v5 01/23] iommu: introduce bind_pasid_table API function
Date: Fri, 11 May 2018 13:53:53 -0700	[thread overview]
Message-ID: <1526072055-86990-2-git-send-email-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <1526072055-86990-1-git-send-email-jacob.jun.pan@linux.intel.com>

Virtual IOMMU was proposed to support Shared Virtual Memory (SVM)
use in the guest:
https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg05311.html

As part of the proposed architecture, when an SVM capable PCI
device is assigned to a guest, nested mode is turned on. Guest owns the
first level page tables (request with PASID) which performs GVA->GPA
translation. Second level page tables are owned by the host for GPA->HPA
translation for both request with and without PASID.

A new IOMMU driver interface is therefore needed to perform tasks as
follows:
* Enable nested translation and appropriate translation type
* Assign guest PASID table pointer (in GPA) and size to host IOMMU

This patch introduces new API functions to perform bind/unbind guest PASID
tables. Based on common data, model specific IOMMU drivers can be extended
to perform the specific steps for binding pasid table of assigned devices.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Liu, Yi L <yi.l.liu@linux.intel.com>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
 drivers/iommu/iommu.c      | 19 +++++++++++++++++++
 include/linux/iommu.h      | 24 ++++++++++++++++++++++++
 include/uapi/linux/iommu.h | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 76 insertions(+)
 create mode 100644 include/uapi/linux/iommu.h

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index d2aa2320..3a69620 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1325,6 +1325,25 @@ int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
 }
 EXPORT_SYMBOL_GPL(iommu_attach_device);
 
+int iommu_bind_pasid_table(struct iommu_domain *domain, struct device *dev,
+			struct pasid_table_config *pasidt_binfo)
+{
+	if (unlikely(!domain->ops->bind_pasid_table))
+		return -ENODEV;
+
+	return domain->ops->bind_pasid_table(domain, dev, pasidt_binfo);
+}
+EXPORT_SYMBOL_GPL(iommu_bind_pasid_table);
+
+void iommu_unbind_pasid_table(struct iommu_domain *domain, struct device *dev)
+{
+	if (unlikely(!domain->ops->unbind_pasid_table))
+		return;
+
+	domain->ops->unbind_pasid_table(domain, dev);
+}
+EXPORT_SYMBOL_GPL(iommu_unbind_pasid_table);
+
 static void __iommu_detach_device(struct iommu_domain *domain,
 				  struct device *dev)
 {
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 19938ee..5199ca4 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -25,6 +25,7 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/of.h>
+#include <uapi/linux/iommu.h>
 
 #define IOMMU_READ	(1 << 0)
 #define IOMMU_WRITE	(1 << 1)
@@ -187,6 +188,8 @@ struct iommu_resv_region {
  * @domain_get_windows: Return the number of windows for a domain
  * @of_xlate: add OF master IDs to iommu grouping
  * @pgsize_bitmap: bitmap of all possible supported page sizes
+ * @bind_pasid_table: bind pasid table pointer for guest SVM
+ * @unbind_pasid_table: unbind pasid table pointer and restore defaults
  */
 struct iommu_ops {
 	bool (*capable)(enum iommu_cap);
@@ -233,8 +236,14 @@ struct iommu_ops {
 	u32 (*domain_get_windows)(struct iommu_domain *domain);
 
 	int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
+
 	bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 
+	int (*bind_pasid_table)(struct iommu_domain *domain, struct device *dev,
+				struct pasid_table_config *pasidt_binfo);
+	void (*unbind_pasid_table)(struct iommu_domain *domain,
+				struct device *dev);
+
 	unsigned long pgsize_bitmap;
 };
 
@@ -296,6 +305,10 @@ extern int iommu_attach_device(struct iommu_domain *domain,
 			       struct device *dev);
 extern void iommu_detach_device(struct iommu_domain *domain,
 				struct device *dev);
+extern int iommu_bind_pasid_table(struct iommu_domain *domain,
+		struct device *dev, struct pasid_table_config *pasidt_binfo);
+extern void iommu_unbind_pasid_table(struct iommu_domain *domain,
+				struct device *dev);
 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 		     phys_addr_t paddr, size_t size, int prot);
@@ -696,6 +709,17 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 	return NULL;
 }
 
+static inline
+int iommu_bind_pasid_table(struct iommu_domain *domain, struct device *dev,
+			struct pasid_table_config *pasidt_binfo)
+{
+	return -ENODEV;
+}
+static inline
+void iommu_unbind_pasid_table(struct iommu_domain *domain, struct device *dev)
+{
+}
+
 #endif /* CONFIG_IOMMU_API */
 
 #endif /* __LINUX_IOMMU_H */
diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
new file mode 100644
index 0000000..cb2d625
--- /dev/null
+++ b/include/uapi/linux/iommu.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * IOMMU user API definitions
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _UAPI_IOMMU_H
+#define _UAPI_IOMMU_H
+
+#include <linux/types.h>
+
+/**
+ * PASID table data used to bind guest PASID table to the host IOMMU. This will
+ * enable guest managed first level page tables.
+ * @version: for future extensions and identification of the data format
+ * @bytes: size of this structure
+ * @base_ptr:	PASID table pointer
+ * @pasid_bits:	number of bits supported in the guest PASID table, must be less
+ *		or equal than the host supported PASID size.
+ */
+struct pasid_table_config {
+	__u32 version;
+#define PASID_TABLE_CFG_VERSION_1 1
+	__u32 bytes;
+	__u64 base_ptr;
+	__u8 pasid_bits;
+};
+
+#endif /* _UAPI_IOMMU_H */
-- 
2.7.4

  reply	other threads:[~2018-05-11 20:53 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11 20:53 [PATCH v5 00/23] IOMMU and VT-d driver support for Shared Virtual Address (SVA) Jacob Pan
2018-05-11 20:53 ` Jacob Pan [this message]
2018-08-23 16:34   ` [PATCH v5 01/23] iommu: introduce bind_pasid_table API function Auger Eric
2018-08-24 12:47     ` Liu, Yi L
2018-08-24 13:20       ` Auger Eric
2018-08-28 17:04         ` Jacob Pan
2018-08-24 15:00   ` Auger Eric
2018-08-28  5:14     ` Jacob Pan
2018-08-28  8:34       ` Auger Eric
2018-08-28 16:36         ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 02/23] iommu/vt-d: move device_domain_info to header Jacob Pan
2018-05-11 20:53 ` [PATCH v5 03/23] iommu/vt-d: add a flag for pasid table bound status Jacob Pan
2018-05-13  7:33   ` Lu Baolu
2018-05-14 18:51     ` Jacob Pan
2018-05-13  8:01   ` Lu Baolu
2018-05-14 18:52     ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 04/23] iommu/vt-d: add bind_pasid_table function Jacob Pan
2018-05-13  9:29   ` Lu Baolu
2018-05-14 20:22     ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 05/23] iommu: introduce iommu invalidate API function Jacob Pan
2018-05-11 20:53 ` [PATCH v5 06/23] iommu/vt-d: add definitions for PFSID Jacob Pan
2018-05-14  1:36   ` Lu Baolu
2018-05-14 20:30     ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 07/23] iommu/vt-d: fix dev iotlb pfsid use Jacob Pan
2018-05-14  1:52   ` Lu Baolu
2018-05-14 20:38     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 08/23] iommu/vt-d: support flushing more translation cache types Jacob Pan
2018-05-14  2:18   ` Lu Baolu
2018-05-14 20:46     ` Jacob Pan
2018-05-17  8:44   ` kbuild test robot
2018-05-11 20:54 ` [PATCH v5 09/23] iommu/vt-d: add svm/sva invalidate function Jacob Pan
2018-05-14  3:35   ` Lu Baolu
2018-05-14 20:49     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 10/23] iommu: introduce device fault data Jacob Pan
2018-09-21 10:07   ` Auger Eric
2018-09-21 17:05     ` Jacob Pan
2018-09-26 10:20       ` Auger Eric
2018-05-11 20:54 ` [PATCH v5 11/23] driver core: add per device iommu param Jacob Pan
2018-05-14  5:27   ` Lu Baolu
2018-05-14 20:52     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 12/23] iommu: add a timeout parameter for prq response Jacob Pan
2018-05-11 20:54 ` [PATCH v5 13/23] iommu: introduce device fault report API Jacob Pan
2018-05-14  6:01   ` Lu Baolu
2018-05-14 20:55     ` Jacob Pan
2018-05-15  6:52       ` Lu Baolu
2018-05-17 11:41   ` Liu, Yi L
2018-05-17 15:59     ` Jacob Pan
2018-05-17 23:22       ` Liu, Yi L
2018-05-21 23:03         ` Jacob Pan
2018-09-06  9:25   ` Auger Eric
2018-09-06 12:42     ` Jean-Philippe Brucker
2018-09-06 13:14       ` Auger Eric
2018-09-06 17:06         ` Jean-Philippe Brucker
2018-09-07  7:11           ` Auger Eric
2018-09-07 11:23             ` Jean-Philippe Brucker
2018-09-14 13:24   ` Auger Eric
2018-09-17 16:57     ` Jacob Pan
2018-09-25 14:58   ` Jean-Philippe Brucker
2018-09-25 22:17     ` Jacob Pan
2018-09-26 10:14       ` Jean-Philippe Brucker
2018-05-11 20:54 ` [PATCH v5 14/23] iommu: introduce page response function Jacob Pan
2018-05-14  6:39   ` Lu Baolu
2018-05-29 16:13     ` Jacob Pan
2018-09-10 14:52   ` Auger Eric
2018-09-10 17:50     ` Jacob Pan
2018-09-10 19:06       ` Auger Eric
2018-05-11 20:54 ` [PATCH v5 15/23] iommu: handle page response timeout Jacob Pan
2018-05-14  7:43   ` Lu Baolu
2018-05-29 16:20     ` Jacob Pan
2018-05-30  7:46       ` Lu Baolu
2018-05-11 20:54 ` [PATCH v5 16/23] iommu/config: add build dependency for dmar Jacob Pan
2018-05-11 20:54 ` [PATCH v5 17/23] iommu/vt-d: report non-recoverable faults to device Jacob Pan
2018-05-14  8:17   ` Lu Baolu
2018-05-29 17:33     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 18/23] iommu/intel-svm: report device page request Jacob Pan
2018-05-11 20:54 ` [PATCH v5 19/23] iommu/intel-svm: replace dev ops with fault report API Jacob Pan
2018-05-11 20:54 ` [PATCH v5 20/23] iommu/intel-svm: do not flush iotlb for viommu Jacob Pan
2018-05-11 20:54 ` [PATCH v5 21/23] iommu/vt-d: add intel iommu page response function Jacob Pan
2018-05-11 20:54 ` [PATCH v5 22/23] trace/iommu: add sva trace events Jacob Pan
2018-05-11 20:54 ` [PATCH v5 23/23] iommu: use sva invalidate and device fault trace event Jacob Pan
2018-05-29 15:54 ` [PATCH v5 00/23] IOMMU and VT-d driver support for Shared Virtual Address (SVA) Jacob Pan

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