[PATCH] cxl: Ignore probes for virtual afu pci devices

[Vaibhav Jain]

Add a check at the beginning of cxl_probe function to ignore virtual pci
devices created for each afu registered. This fixes the the errors
messages logged about missing CXL vsec, when cxl probe is unable to
find necessary vsec entries in device pci config space. The error
message logged are of the form :

cxl-pci 0004:00:00.0: ABORTING: CXL VSEC not found!
cxl-pci 0004:00:00.0: cxl_init_adapter failed: -19

Cc: Ian Munsie <imunsie at au1.ibm.com>
Cc: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
---
 drivers/misc/cxl/cxl.h  | 2 ++
 drivers/misc/cxl/pci.c  | 5 +++++
 drivers/misc/cxl/vphb.c | 9 +++++++++
 3 files changed, 16 insertions(+)

diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index a521bc7..68d39f5 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -764,4 +764,6 @@ unsigned int afu_poll(struct file *file, struct poll_table_struct *poll);
 ssize_t afu_read(struct file *file, char __user *buf, size_t count, loff_t *off);
 extern const struct file_operations afu_fops;
 
+/* check if the given pci_dev is on the the cxl vphb bus */
+bool cxl_pci_is_vphb_device(struct pci_dev *dev);
 #endif
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 4c1903f..2f219c1 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1278,6 +1278,11 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	int slice;
 	int rc;
 
+	if (cxl_pci_is_vphb_device(dev)) {
+		dev_dbg(&dev->dev, "cxl_init_adapter: Ignoring cxl vphb device\n");
+		return -ENODEV;
+	}
+
 	if (cxl_verbose)
 		dump_cxl_config_space(dev);
 
diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
index cbd4331..e76a42a 100644
--- a/drivers/misc/cxl/vphb.c
+++ b/drivers/misc/cxl/vphb.c
@@ -296,6 +296,15 @@ void cxl_pci_vphb_remove(struct cxl_afu *afu)
 	pcibios_free_controller(phb);
 }
 
+bool cxl_pci_is_vphb_device(struct pci_dev *dev)
+{
+	struct pci_controller *phb;
+
+	phb = pci_bus_to_host(dev->bus);
+
+	return (phb->ops == &cxl_pcie_pci_ops);
+}
+
 struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev)
 {
 	struct pci_controller *phb;
-- 
2.7.0.dirty