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From: CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
CC: "jasowang@redhat.com" <jasowang@redhat.com>, "zhenzhong.duan@intel.com"
<zhenzhong.duan@intel.com>, "kevin.tian@intel.com" <kevin.tian@intel.com>,
"yi.l.liu@intel.com" <yi.l.liu@intel.com>, "joao.m.martins@oracle.com"
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<tjeznach@rivosinc.com>, "minwoo.im@samsung.com" <minwoo.im@samsung.com>,
CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>
Subject: [PATCH v4 12/19] pci: Add a pci-level initialization function for
iommu notifiers
Thread-Topic: [PATCH v4 12/19] pci: Add a pci-level initialization function
for iommu notifiers
Thread-Index: AQHbiQYDp5Ri8/0j4Uey1wj09Ce2TQ==
Date: Thu, 27 Feb 2025 10:54:45 +0000
Message-ID: <20250227105339.388598-13-clement.mathieu--drif@eviden.com>
References: <20250227105339.388598-1-clement.mathieu--drif@eviden.com>
In-Reply-To: <20250227105339.388598-1-clement.mathieu--drif@eviden.com>
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From: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
We add a convenient way to initialize an device-iotlb notifier.
This is meant to be used by ATS-capable devices.
pci_device_iommu_memory_region_pasid is introduces in this commit and
will be used in several other SVM-related functions exposed in
the PCI API.
Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
---
hw/pci/pci.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/hw/pci/pci.h | 15 +++++++++++++++
2 files changed, 55 insertions(+)
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 164bb22e05..be29c0375f 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2825,6 +2825,46 @@ AddressSpace *pci_device_iommu_address_space(PCIDevi=
ce *dev)
return &address_space_memory;
}
=20
+static IOMMUMemoryRegion *pci_device_iommu_memory_region_pasid(PCIDevice *=
dev,
+ uint32_t pa=
sid)
+{
+ PCIBus *bus;
+ PCIBus *iommu_bus;
+ int devfn;
+
+ /*
+ * This function is for internal use in the module,
+ * we can call it with PCI_NO_PASID
+ */
+ if (!dev->is_master ||
+ ((pasid !=3D PCI_NO_PASID) && !pcie_pasid_enabled(dev))) {
+ return NULL;
+ }
+
+ pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
+ if (iommu_bus && iommu_bus->iommu_ops->get_memory_region_pasid) {
+ return iommu_bus->iommu_ops->get_memory_region_pasid(bus,
+ iommu_bus->iommu_opaque, devfn, pasid);
+ }
+ return NULL;
+}
+
+bool pci_iommu_init_iotlb_notifier(PCIDevice *dev, uint32_t pasid,
+ IOMMUNotifier *n, IOMMUNotify fn,
+ void *opaque)
+{
+ IOMMUMemoryRegion *iommu_mr =3D pci_device_iommu_memory_region_pasid(d=
ev,
+ pa=
sid);
+ if (!iommu_mr) {
+ return false;
+ }
+ iommu_notifier_init(n, fn, IOMMU_NOTIFIER_DEVIOTLB_EVENTS, 0, HWADDR_M=
AX,
+ memory_region_iommu_attrs_to_index(iommu_mr,
+ MEMTXATTRS_UNSPECIF=
IED));
+ n->opaque =3D opaque;
+ return true;
+}
+
bool pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *hiod,
Error **errp)
{
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 644551550b..a11366e08d 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -446,6 +446,21 @@ bool pci_device_set_iommu_device(PCIDevice *dev, HostI=
OMMUDevice *hiod,
Error **errp);
void pci_device_unset_iommu_device(PCIDevice *dev);
=20
+/**
+ * pci_iommu_init_iotlb_notifier: initialize an IOMMU notifier
+ *
+ * This function is used by devices before registering an IOTLB notifier
+ *
+ * @dev: the device
+ * @pasid: the pasid of the address space to watch
+ * @n: the notifier to initialize
+ * @fn: the callback to be installed
+ * @opaque: user pointer that can be used to store a state
+ */
+bool pci_iommu_init_iotlb_notifier(PCIDevice *dev, uint32_t pasid,
+ IOMMUNotifier *n, IOMMUNotify fn,
+ void *opaque);
+
/**
* pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
*
--=20
2.48.1