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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 09/23] iommu/vt-d: add svm/sva invalidate function
Date: Fri, 11 May 2018 13:54:01 -0700	[thread overview]
Message-ID: <1526072055-86990-10-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>

When Shared Virtual Address (SVA) is enabled for a guest OS via
vIOMMU, we need to provide invalidation support at IOMMU API and driver
level. This patch adds Intel VT-d specific function to implement
iommu passdown invalidate API for shared virtual address.

The use case is for supporting caching structure invalidation
of assigned SVM capable devices. Emulated IOMMU exposes queue
invalidation capability and passes down all descriptors from the guest
to the physical IOMMU.

The assumption is that guest to host device ID mapping should be
resolved prior to calling IOMMU driver. Based on the device handle,
host IOMMU driver can replace certain fields before submit to the
invalidation queue.

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/intel-iommu.c | 129 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 732a10f..684bd98 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4973,6 +4973,134 @@ static void intel_iommu_detach_device(struct iommu_domain *domain,
 	dmar_remove_one_dev_info(to_dmar_domain(domain), dev);
 }
 
+/*
+ * 2D array for converting and sanitizing IOMMU generic TLB granularity to
+ * VT-d granularity. Invalidation is typically included in the unmap operation
+ * as a result of DMA or VFIO unmap. However, for assigned device where guest
+ * could own the first level page tables without being shadowed by QEMU. In
+ * this case there is no pass down unmap to the host IOMMU as a result of unmap
+ * in the guest. Only invalidations are trapped and passed down.
+ * In all cases, only first level TLB invalidation (request with PASID) can be
+ * passed down, therefore we do not include IOTLB granularity for request
+ * without PASID (second level).
+ *
+ * For an example, to find the VT-d granularity encoding for IOTLB
+ * type and page selective granularity within PASID:
+ * X: indexed by enum iommu_inv_type
+ * Y: indexed by enum iommu_inv_granularity
+ * [IOMMU_INV_TYPE_TLB][IOMMU_INV_GRANU_PAGE_PASID]
+ *
+ * Granu_map array indicates validity of the table. 1: valid, 0: invalid
+ *
+ */
+const static int inv_type_granu_map[IOMMU_INV_NR_TYPE][IOMMU_INV_NR_GRANU] = {
+	/* Extended dev TLBs */
+	{1, 1, 1},
+	/* Extended IOTLB */
+	{1, 1, 1},
+	/* PASID cache */
+	{1, 1, 0}
+};
+
+const static u64 inv_type_granu_table[IOMMU_INV_NR_TYPE][IOMMU_INV_NR_GRANU] = {
+	/* extended dev IOTLBs */
+	{QI_DEV_IOTLB_GRAN_ALL, QI_DEV_IOTLB_GRAN_PASID_SEL, 0},
+	/* Extended IOTLB */
+	{QI_GRAN_NONG_ALL, QI_GRAN_NONG_PASID, QI_GRAN_PSI_PASID},
+	/* PASID cache */
+	{QI_PC_ALL_PASIDS, QI_PC_PASID_SEL, 0},
+};
+
+static inline int to_vtd_granularity(int type, int granu, u64 *vtd_granu)
+{
+	if (type >= IOMMU_INV_NR_TYPE || granu >= IOMMU_INV_NR_GRANU ||
+		!inv_type_granu_map[type][granu])
+		return -EINVAL;
+
+	*vtd_granu = inv_type_granu_table[type][granu];
+
+	return 0;
+}
+
+static int intel_iommu_sva_invalidate(struct iommu_domain *domain,
+		struct device *dev, struct tlb_invalidate_info *inv_info)
+{
+	struct intel_iommu *iommu;
+	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+	struct device_domain_info *info;
+	u16 did, sid;
+	u8 bus, devfn;
+	int ret = 0;
+	u64 granu;
+	unsigned long flags;
+
+	if (!inv_info || !dmar_domain ||
+		inv_info->hdr.type != TLB_INV_HDR_VERSION_1)
+		return -EINVAL;
+
+	iommu = device_to_iommu(dev, &bus, &devfn);
+	if (!iommu)
+		return -ENODEV;
+
+	if (!dev || !dev_is_pci(dev))
+		return -ENODEV;
+
+	did = dmar_domain->iommu_did[iommu->seq_id];
+	sid = PCI_DEVID(bus, devfn);
+	ret = to_vtd_granularity(inv_info->hdr.type, inv_info->granularity,
+				&granu);
+	if (ret) {
+		pr_err("Invalid range type %d, granu %d\n", inv_info->hdr.type,
+			inv_info->granularity);
+		return ret;
+	}
+
+	spin_lock(&iommu->lock);
+	spin_lock_irqsave(&device_domain_lock, flags);
+
+	switch (inv_info->hdr.type) {
+	case IOMMU_INV_TYPE_TLB:
+		if (inv_info->size &&
+			(inv_info->addr & ((1 << (VTD_PAGE_SHIFT + inv_info->size)) - 1))) {
+			pr_err("Addr out of range, addr 0x%llx, size order %d\n",
+				inv_info->addr, inv_info->size);
+			ret = -ERANGE;
+			goto out_unlock;
+		}
+
+		qi_flush_eiotlb(iommu, did, mm_to_dma_pfn(inv_info->addr),
+				inv_info->pasid,
+				inv_info->size, granu,
+				inv_info->flags & IOMMU_INVALIDATE_GLOBAL_PAGE);
+		/**
+		 * Always flush device IOTLB if ATS is enabled since guest
+		 * vIOMMU exposes CM = 1, no device IOTLB flush will be passed
+		 * down.
+		 */
+		info = iommu_support_dev_iotlb(dmar_domain, iommu, bus, devfn);
+		if (info && info->ats_enabled) {
+			qi_flush_dev_eiotlb(iommu, sid,
+					inv_info->pasid, info->ats_qdep,
+					inv_info->addr, inv_info->size,
+					granu);
+		}
+		break;
+	case IOMMU_INV_TYPE_PASID:
+		qi_flush_pasid(iommu, did, granu, inv_info->pasid);
+
+		break;
+	default:
+		dev_err(dev, "Unknown IOMMU invalidation type %d\n",
+			inv_info->hdr.type);
+		ret = -EINVAL;
+	}
+out_unlock:
+	spin_unlock(&iommu->lock);
+	spin_unlock_irqrestore(&device_domain_lock, flags);
+
+	return ret;
+}
+
 static int intel_iommu_map(struct iommu_domain *domain,
 			   unsigned long iova, phys_addr_t hpa,
 			   size_t size, int iommu_prot)
@@ -5401,6 +5529,7 @@ const struct iommu_ops intel_iommu_ops = {
 #ifdef CONFIG_INTEL_IOMMU_SVM
 	.bind_pasid_table	= intel_iommu_bind_pasid_table,
 	.unbind_pasid_table	= intel_iommu_unbind_pasid_table,
+	.sva_invalidate		= intel_iommu_sva_invalidate,
 #endif
 	.map			= intel_iommu_map,
 	.unmap			= intel_iommu_unmap,
-- 
2.7.4

  parent reply	other threads:[~2018-05-11 20:54 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 ` [PATCH v5 01/23] iommu: introduce bind_pasid_table API function Jacob Pan
2018-08-23 16:34   ` 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 ` Jacob Pan [this message]
2018-05-14  3:35   ` [PATCH v5 09/23] iommu/vt-d: add svm/sva invalidate function 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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