From: Clement Mathieu--Drif <clement.mathieu--d...@eviden.com>
Devices implementing ATS can send translation requests using
pci_ats_request_translation_pasid.
The invalidation events are sent back to the device using the iommu
notifier managed with pci_register_iommu_tlb_event_notifier and
pci_unregister_iommu_tlb_event_notifier
Signed-off-by: Clement Mathieu--Drif <clement.mathieu--d...@eviden.com>
---
hw/pci/pci.c | 46 +++++++++++++++++++++++++++++++++++++++
include/hw/pci/pci.h | 52 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 98 insertions(+)
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index be29c0375f..0ccd0656b7 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2896,6 +2896,52 @@ void pci_device_unset_iommu_device(PCIDevice *dev)
}
}
+ssize_t pci_ats_request_translation_pasid(PCIDevice *dev, uint32_t pasid,
+ bool priv_req, bool exec_req,
+ hwaddr addr, size_t length,
+ bool no_write, IOMMUTLBEntry *result,
+ size_t result_length,
+ uint32_t *err_count)
+{
+ IOMMUMemoryRegion *iommu_mr = pci_device_iommu_memory_region_pasid(dev,
+ pasid);
+
+ assert(result_length);
+
+ if (!iommu_mr || !pcie_ats_enabled(dev)) {
+ return -EPERM;
+ }
+ return memory_region_iommu_ats_request_translation(iommu_mr, priv_req,
+ exec_req, addr, length,
+ no_write, result,
+ result_length,
+ err_count);
+}
+
+int pci_register_iommu_tlb_event_notifier(PCIDevice *dev, uint32_t pasid,
+ IOMMUNotifier *n)
+{
+ IOMMUMemoryRegion *iommu_mr = pci_device_iommu_memory_region_pasid(dev,
+ pasid);
+ if (!iommu_mr) {
+ return -EPERM;
+ }
+ return memory_region_register_iommu_notifier(MEMORY_REGION(iommu_mr), n,
+ &error_fatal);
+}
+
+int pci_unregister_iommu_tlb_event_notifier(PCIDevice *dev, uint32_t pasid,
+ IOMMUNotifier *n)
+{
+ IOMMUMemoryRegion *iommu_mr = pci_device_iommu_memory_region_pasid(dev,
+ pasid);
+ if (!iommu_mr) {
+ return -EPERM;
+ }
+ memory_region_unregister_iommu_notifier(MEMORY_REGION(iommu_mr), n);
+ return 0;
+}
+
void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
{
/*
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index a11366e08d..592e72aee9 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -461,6 +461,58 @@ bool pci_iommu_init_iotlb_notifier(PCIDevice *dev,
uint32_t pasid,
IOMMUNotifier *n, IOMMUNotify fn,
void *opaque);
+/**
+ * pci_ats_request_translation_pasid: perform an ATS request
+ *
+ * Return the number of translations stored in @result in case of success,
+ * a negative error code otherwise.
+ * -ENOMEM is returned when the result buffer is not large enough to store
+ * all the translations
+ *
+ * @dev: the ATS-capable PCI device
+ * @pasid: the pasid of the address space in which the translation will be made
+ * @priv_req: privileged mode bit (PASID TLP)
+ * @exec_req: execute request bit (PASID TLP)
+ * @addr: start address of the memory range to be translated
+ * @length: length of the memory range in bytes
+ * @no_write: request a read-only access translation (if supported by the
IOMMU)
+ * @result: buffer in which the TLB entries will be stored
+ * @result_length: result buffer length
+ * @err_count: number of untranslated subregions
+ */
+ssize_t pci_ats_request_translation_pasid(PCIDevice *dev, uint32_t pasid,
+ bool priv_req, bool exec_req,
+ hwaddr addr, size_t length,
+ bool no_write, IOMMUTLBEntry *result,
+ size_t result_length,
+ uint32_t *err_count);
+
+/**
+ * pci_register_iommu_tlb_event_notifier: register a notifier for changes to
+ * IOMMU translation entries in a specific address space.
+ *
+ * Returns 0 on success, or a negative errno otherwise.
+ *
+ * @dev: the device that wants to get notified
+ * @pasid: the pasid of the address space to track
+ * @n: the notifier to register
+ */
+int pci_register_iommu_tlb_event_notifier(PCIDevice *dev, uint32_t pasid,
+ IOMMUNotifier *n);
+
+/**
+ * pci_unregister_iommu_tlb_event_notifier: unregister a notifier that has been
+ * registerd with pci_register_iommu_tlb_event_notifier
+ *
+ * Returns 0 on success, or a negative errno otherwise.
+ *
+ * @dev: the device that wants to unsubscribe
+ * @pasid: the pasid of the address space to be untracked
+ * @n: the notifier to unregister
+ */
+int pci_unregister_iommu_tlb_event_notifier(PCIDevice *dev, uint32_t pasid,
+ IOMMUNotifier *n);
+
/**
* pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
*
--
2.47.1
