[Minios-devel] [UNIKRAFT PATCH] plat/common: PCI bus probes the device identifier

[Sharan Santhanam <sharan.santhanam@xxxxxxxxx>]

While probing the devices on the pci bus, the device identifier are
read from the configuration space. The pci device is identified with
* class_id
* vendor_id
* device_id
* subsystem_id
* subsystemvendor_id

Signed-off-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
 plat/common/pci_bus.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/plat/common/pci_bus.c b/plat/common/pci_bus.c
index c653e81..71713c9 100644
--- a/plat/common/pci_bus.c
+++ b/plat/common/pci_bus.c
@@ -80,6 +80,22 @@ static struct pci_bus_handler ph;
 #define PCI_DEVICE_SHIFT            (11)
 #define PCI_ENABLE_BIT              (1 << 31)
 
+#define PCI_CONF_CLASS_ID          (0x08)
+#define PCI_CONF_CLASS_ID_SHFT     (8)
+#define PCI_CONF_CLASS_ID_MASK     (0x00FFFFFF)
+
+#define PCI_CONF_VENDOR_ID          (0x00)
+#define PCI_CONF_VENDOR_ID_SHFT     (0)
+#define PCI_CONF_VENDOR_ID_MASK     (0x0000FFFF)
+
+#define PCI_CONF_DEVICE_ID          (0x00)
+#define PCI_CONF_DEVICE_ID_SHFT     (16)
+#define PCI_CONF_DEVICE_ID_MASK     (0x0000FFFF)
+
+#define PCI_CONF_SUBSYSVEN_ID          (0x2c)
+#define PCI_CONF_SUBSYSVEN_ID_SHFT     (0)
+#define PCI_CONF_SUBSYSVEN_ID_MASK     (0xFFFF)
+
 #define PCI_CONF_SUBSYS_ID          (0x2c)
 #define PCI_CONF_SUBSYS_ID_SHFT     (16)
 #define PCI_CONF_SUBSYS_ID_MASK     (0xFFFF)
@@ -236,14 +252,16 @@ static int pci_probe(void)
                                continue;
                        }
 
-                       /* TODO: Implement fetch more information from PCI */
-                       devid.class_id            = PCI_CLASS_ANY_ID;
-                       /* TODO: Implement fetch more information from PCI */
-                       devid.device_id           = PCI_ANY_ID;
-                       /* TODO: Implement fetch more information from PCI */
-                       devid.subsystem_vendor_id = PCI_ANY_ID;
+                       PCI_CONF_READ(uint32_t, &devid.class_id,
+                                       config_addr, CLASS_ID);
+                       PCI_CONF_READ(uint16_t, &devid.vendor_id,
+                                       config_addr, VENDOR_ID);
+                       PCI_CONF_READ(uint16_t, &devid.device_id,
+                                       config_addr, DEVICE_ID);
                        PCI_CONF_READ(uint16_t, &devid.subsystem_device_id,
                                        config_addr, SUBSYS_ID);
+                       PCI_CONF_READ(uint16_t, &devid.subsystem_vendor_id,
+                                       config_addr, SUBSYSVEN_ID);
 
                        uk_pr_info("PCI %02x:%02x.%02x (%04x %04x:%04x): ",
                                   (int) addr.bus,
-- 
2.7.4


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