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From: CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
CC: "jasowang@redhat.com" <jasowang@redhat.com>, "zhenzhong.duan@intel.com"
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CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>
Subject: [PATCH v2 07/19] pcie: Helper function to check if ATS is enabled
Thread-Topic: [PATCH v2 07/19] pcie: Helper function to check if ATS is
enabled
Thread-Index: AQHba2KScjmpYxRe6UitchMA/gFjVA==
Date: Mon, 20 Jan 2025 17:41:45 +0000
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From: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
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 <clement.mathieu--drif@eviden.com>
---
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 8186d64234..3b8fd6f33c 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -1247,3 +1247,12 @@ bool pcie_pasid_enabled(const PCIDevice *dev)
return (pci_get_word(dev->config + dev->exp.pasid_cap + PCI_PASID_CTRL=
) &
PCI_PASID_CTRL_ENABLE) !=3D 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) !=3D 0;
+}
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index 63604ccc6e..7e7b8baa6e 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -158,4 +158,5 @@ void pcie_pasid_init(PCIDevice *dev, uint16_t offset, u=
int8_t pasid_width,
bool exec_perm, bool priv_mod);
=20
bool pcie_pasid_enabled(const PCIDevice *dev);
+bool pcie_ats_enabled(const PCIDevice *dev);
#endif /* QEMU_PCIE_H */
--=20
2.47.1