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--d...@eviden.com> --- hw/pci/pci.c | 17 +++++++++++++++++ include/hw/pci/pci.h | 26 ++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 1114ba8529..fc4954ac81 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -2970,6 +2970,23 @@ void pci_device_unset_iommu_device(PCIDevice *dev) } } +int pci_iommu_get_iotlb_info(PCIDevice *dev, uint8_t *addr_width, + uint32_t *min_page_size) +{ + 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->get_iotlb_info) { + iommu_bus->iommu_ops->get_iotlb_info(iommu_bus->iommu_opaque, + addr_width, min_page_size); + return 0; + } + + return -ENODEV; +} + 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 c2fe6caa2c..d67ffe12db 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -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 * -- 2.49.0