From 042cbc9aec7caca639dcb1a8a996406a7c572706 Mon Sep 17 00:00:00 2001 From: CLEMENT MATHIEU--DRIF Date: Tue, 20 May 2025 07:18:59 +0000 Subject: [PATCH] pci: Add an API to get IOMMU's min page size and virtual address width This kind of information is needed by devices implementing ATS in order to initialize their translation cache. Signed-off-by: Clement Mathieu--Drif Message-Id: <20250520071823.764266-8-clement.mathieu--drif@eviden.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- 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 * -- 2.39.5