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pci: Add a pci-level initialization function for IOMMU notifiers

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This is meant to be used by ATS-capable devices.

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Message-Id: <20250520071823.764266-10-clement.mathieu--drif@eviden.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
CLEMENT MATHIEU--DRIF 2025-05-20 07:19:01 +00:00 • committed by Michael S. Tsirkin
parent 7e94e45296
commit a849ff5d6f
2 changed files with 50 additions and 0 deletions
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17
hw/pci/pci.c
View file

@ -2939,6 +2939,23 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
return &address_space_memory; return &address_space_memory;
} }
int pci_iommu_init_iotlb_notifier(PCIDevice *dev, IOMMUNotifier *n,
IOMMUNotify fn, void *opaque)
{
PCIBus *bus;
PCIBus *iommu_bus;
int devfn;
pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
if (iommu_bus && iommu_bus->iommu_ops->init_iotlb_notifier) {
iommu_bus->iommu_ops->init_iotlb_notifier(bus, iommu_bus->iommu_opaque,
devfn, n, fn, opaque);
return 0;
}
return -ENODEV;
}
bool pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *hiod, bool pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *hiod,
Error **errp) Error **errp)
{ {

33
include/hw/pci/pci.h
View file

@ -442,6 +442,26 @@ typedef struct PCIIOMMUOps {
*/ */
void (*get_iotlb_info)(void *opaque, uint8_t *addr_width, void (*get_iotlb_info)(void *opaque, uint8_t *addr_width,
uint32_t *min_page_size); uint32_t *min_page_size);
/**
* @init_iotlb_notifier: initialize an IOMMU notifier.
*
* Optional callback.
*
* @bus: the #PCIBus of the PCI device.
*
* @opaque: the data passed to pci_setup_iommu().
*
* @devfn: device and function number of the PCI device.
*
* @n: the notifier to be initialized.
*
* @fn: the callback to be installed.
*
* @user_opaque: a user pointer that can be used to track a state.
*/
void (*init_iotlb_notifier)(PCIBus *bus, void *opaque, int devfn,
IOMMUNotifier *n, IOMMUNotify fn,
void *user_opaque);
} PCIIOMMUOps; } PCIIOMMUOps;
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev); AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
@ -462,6 +482,19 @@ void pci_device_unset_iommu_device(PCIDevice *dev);
int pci_iommu_get_iotlb_info(PCIDevice *dev, uint8_t *addr_width, int pci_iommu_get_iotlb_info(PCIDevice *dev, uint8_t *addr_width,
uint32_t *min_page_size); uint32_t *min_page_size);
/**
* pci_iommu_init_iotlb_notifier: initialize an IOMMU notifier.
*
* This function is used by devices before registering an IOTLB notifier.
*
* @dev: the device.
* @n: the notifier to be initialized.
* @fn: the callback to be installed.
* @opaque: a user pointer that can be used to track a state.
*/
int pci_iommu_init_iotlb_notifier(PCIDevice *dev, IOMMUNotifier *n,
IOMMUNotify fn, void *opaque);
/** /**
* pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
* *