From 6a3ae6a2440dead9dd8e3f84152dc53a5214c48d Mon Sep 17 00:00:00 2001 From: CLEMENT MATHIEU--DRIF Date: Tue, 20 May 2025 07:18:52 +0000 Subject: [PATCH] pcie: Helper function to check if ATS is enabled ats_enabled checks whether the capability is present or not. If so, we read the configuration space to get the status of the feature (enabled or not). Signed-off-by: Clement Mathieu--Drif Message-Id: <20250520071823.764266-4-clement.mathieu--drif@eviden.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/pci/pcie.c | 9 +++++++++ include/hw/pci/pcie.h | 1 + 2 files changed, 10 insertions(+) diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c index db9756d861..36de709801 100644 --- a/hw/pci/pcie.c +++ b/hw/pci/pcie.c @@ -1248,3 +1248,12 @@ bool pcie_pasid_enabled(const PCIDevice *dev) return (pci_get_word(dev->config + dev->exp.pasid_cap + PCI_PASID_CTRL) & PCI_PASID_CTRL_ENABLE) != 0; } + +bool pcie_ats_enabled(const PCIDevice *dev) +{ + if (!pci_is_express(dev) || !dev->exp.ats_cap) { + return false; + } + return (pci_get_word(dev->config + dev->exp.ats_cap + PCI_ATS_CTRL) & + PCI_ATS_CTRL_ENABLE) != 0; +} diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h index dff98ff2c6..497d0bc2d2 100644 --- a/include/hw/pci/pcie.h +++ b/include/hw/pci/pcie.h @@ -156,4 +156,5 @@ void pcie_pasid_init(PCIDevice *dev, uint16_t offset, uint8_t pasid_width, bool exec_perm, bool priv_mod); bool pcie_pasid_enabled(const PCIDevice *dev); +bool pcie_ats_enabled(const PCIDevice *dev); #endif /* QEMU_PCIE_H */ -- 2.39.5