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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"
<zhenzhong.duan@intel.com>, "kevin.tian@intel.com" <kevin.tian@intel.com>,
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<tjeznach@rivosinc.com>, "minwoo.im@samsung.com" <minwoo.im@samsung.com>,
CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>
Subject: [PATCH v2 06/19] pcie: Helper functions to check if PASID is enabled
Thread-Topic: [PATCH v2 06/19] pcie: Helper functions to check if PASID is
enabled
Thread-Index: AQHba2KSYJRjLgZTYkGGJ4ezUhqhcA==
Date: Mon, 20 Jan 2025 17:41:44 +0000
Message-ID: <20250120174033.308518-7-clement.mathieu--drif@eviden.com>
References: <20250120174033.308518-1-clement.mathieu--drif@eviden.com>
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From: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
pasid_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 | 2 ++
2 files changed, 11 insertions(+)
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index f42a256f15..8186d64234 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -1238,3 +1238,12 @@ void pcie_pasid_init(PCIDevice *dev, uint16_t offset=
, uint8_t pasid_width,
=20
dev->exp.pasid_cap =3D offset;
}
+
+bool pcie_pasid_enabled(const PCIDevice *dev)
+{
+ if (!pci_is_express(dev) || !dev->exp.pasid_cap) {
+ return false;
+ }
+ return (pci_get_word(dev->config + dev->exp.pasid_cap + PCI_PASID_CTRL=
) &
+ PCI_PASID_CTRL_ENABLE) !=3D 0;
+}
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index aa040c3e97..63604ccc6e 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -156,4 +156,6 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler *ho=
tplug_dev,
=20
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);
#endif /* QEMU_PCIE_H */
--=20
2.47.1