nvme-pci: Add .get_address ctrl callback

The nvme-fabrics exports the controller address to sysfs, and we'd
like to have parity with this feature for PCIe. This patch provides
the appropiate callback and returns the controller address as the pci
domain:bus:device.function.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index aacc8e4b0051b8633988cdd2f7fe301ebb59a735..6aec86b8f8ab6ba38cfc6c3d78c279bc1952f6f9 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2414,6 +2414,13 @@ static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
        return 0;
 }
 
+static int nvme_pci_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
+{
+       struct pci_dev *pdev = to_pci_dev(to_nvme_dev(ctrl)->dev);
+
+       return snprintf(buf, size, "%s", dev_name(&pdev->dev));
+}
+
 static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
        .name                   = "pcie",
        .module                 = THIS_MODULE,
@@ -2423,6 +2430,7 @@ static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
        .reg_read64             = nvme_pci_reg_read64,
        .free_ctrl              = nvme_pci_free_ctrl,
        .submit_async_event     = nvme_pci_submit_async_event,
+       .get_address            = nvme_pci_get_address,
 };
 
 static int nvme_dev_map(struct nvme_dev *dev)