pcie: Add a PCIe capability version helper

Report the PCIe capability version for a device

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Robin Voetter <robin@streamhpc.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index b8c24cf..b7f107e 100644 (file)
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -274,6 +274,13 @@ uint8_t pcie_cap_get_type(const PCIDevice *dev)
             PCI_EXP_FLAGS_TYPE) >> PCI_EXP_FLAGS_TYPE_SHIFT;
 }
 
+uint8_t pcie_cap_get_version(const PCIDevice *dev)
+{
+    uint32_t pos = dev->exp.exp_cap;
+    assert(pos > 0);
+    return pci_get_word(dev->config + pos + PCI_EXP_FLAGS) & PCI_EXP_FLAGS_VERS;
+}
+
 /* MSI/MSI-X */
 /* pci express interrupt message number */
 /* 7.8.2 PCI Express Capabilities Register: Interrupt Message Number */

diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index 3cc2b15..51ab57b 100644 (file)
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -93,6 +93,7 @@ void pcie_cap_exit(PCIDevice *dev);
 int pcie_endpoint_cap_v1_init(PCIDevice *dev, uint8_t offset);
 void pcie_cap_v1_exit(PCIDevice *dev);
 uint8_t pcie_cap_get_type(const PCIDevice *dev);
+uint8_t pcie_cap_get_version(const PCIDevice *dev);
 void pcie_cap_flags_set_vector(PCIDevice *dev, uint8_t vector);
 uint8_t pcie_cap_flags_get_vector(PCIDevice *dev);