bus/pci: configure PCI bus master

[dpdk.git] / drivers / bus / pci / pci_common.c

diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
index ee7f966..35d7d09 100644 (file)
--- a/drivers/bus/pci/pci_common.c
+++ b/drivers/bus/pci/pci_common.c
@@ -746,6 +746,34 @@ rte_pci_find_ext_capability(struct rte_pci_device *dev, uint32_t cap)
        return 0;
 }
 
+int
+rte_pci_set_bus_master(struct rte_pci_device *dev, bool enable)
+{
+       uint16_t old_cmd, cmd;
+
+       if (rte_pci_read_config(dev, &old_cmd, sizeof(old_cmd),
+                               RTE_PCI_COMMAND) < 0) {
+               RTE_LOG(ERR, EAL, "error in reading PCI command register\n");
+               return -1;
+       }
+
+       if (enable)
+               cmd = old_cmd | RTE_PCI_COMMAND_MASTER;
+       else
+               cmd = old_cmd & ~RTE_PCI_COMMAND_MASTER;
+
+       if (cmd == old_cmd)
+               return 0;
+
+       if (rte_pci_write_config(dev, &cmd, sizeof(cmd),
+                                RTE_PCI_COMMAND) < 0) {
+               RTE_LOG(ERR, EAL, "error in writing PCI command register\n");
+               return -1;
+       }
+
+       return 0;
+}
+
 struct rte_pci_bus rte_pci_bus = {
        .bus = {
                .scan = rte_pci_scan,