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pci: Add an API to get IOMMU's min page size and virtual address width

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This kind of information is needed by devices implementing ATS in order
to initialize their translation cache.

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Message-Id: <20250520071823.764266-8-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 07:18:59 +00:00 • committed by Michael S. Tsirkin
parent 8ff9e1def0
commit 042cbc9aec
2 changed files with 43 additions and 0 deletions
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26
include/hw/pci/pci.h
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@ -429,6 +429,19 @@ typedef struct PCIIOMMUOps {
* @devfn: device and function number of the PCI device.
*/
void (*unset_iommu_device)(PCIBus *bus, void *opaque, int devfn);
/**
* @get_iotlb_info: get properties required to initialize a device IOTLB.
*
* Callback required if devices are allowed to cache translations.
*
* @opaque: the data passed to pci_setup_iommu().
*
* @addr_width: the address width of the IOMMU (output parameter).
*
* @min_page_size: the page size of the IOMMU (output parameter).
*/
void (*get_iotlb_info)(void *opaque, uint8_t *addr_width,
uint32_t *min_page_size);
} PCIIOMMUOps;
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
@ -436,6 +449,19 @@ bool pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *hiod,
Error **errp);
void pci_device_unset_iommu_device(PCIDevice *dev);
/**
* pci_iommu_get_iotlb_info: get properties required to initialize a
* device IOTLB.
*
* Returns 0 on success, or a negative errno otherwise.
*
* @dev: the device that wants to get the information.
* @addr_width: the address width of the IOMMU (output parameter).
* @min_page_size: the page size of the IOMMU (output parameter).
*/
int pci_iommu_get_iotlb_info(PCIDevice *dev, uint8_t *addr_width,
uint32_t *min_page_size);
/**
* pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
*