cxlflash: Use new cxl_pci_read_adapter_vpd() API

BugLink: http://bugs.launchpad.net/bugs/1588468

To read the adapter VPD, drivers can't rely on pci config APIs, as it
wouldn't work on powerVM. cxl introduced a new kernel API especially
for this, so start using it.
Co-authored-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Acked-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
(cherry picked from commit ca946d4e)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/scsi/cxlflash/common.h

@@ -108,7 +108,6 @@ struct cxlflash_cfg {
 	atomic_t scan_host_needed;
 
 	struct cxl_afu *cxl_afu;
-	struct pci_dev *parent_dev;
 
 	atomic_t recovery_threads;
 	struct mutex ctx_recovery_mutex;

drivers/scsi/cxlflash/main.c

@@ -1355,7 +1355,7 @@ static int start_context(struct cxlflash_cfg *cfg)
  */
 static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[])
 {
-	struct pci_dev *dev = cfg->parent_dev;
+	struct pci_dev *dev = cfg->dev;
 	int rc = 0;
 	int ro_start, ro_size, i, j, k;
 	ssize_t vpd_size;
@@ -1364,7 +1364,7 @@ static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[])
 	char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" };
 
 	/* Get the VPD data from the device */
-	vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data);
+	vpd_size = cxl_read_adapter_vpd(dev, vpd_data, sizeof(vpd_data));
 	if (unlikely(vpd_size <= 0)) {
 		dev_err(&dev->dev, "%s: Unable to read VPD (size = %ld)\n",
 		       __func__, vpd_size);
@@ -2350,7 +2350,6 @@ static int cxlflash_probe(struct pci_dev *pdev,
 {
 	struct Scsi_Host *host;
 	struct cxlflash_cfg *cfg = NULL;
-	struct device *phys_dev;
 	struct dev_dependent_vals *ddv;
 	int rc = 0;
 
@@ -2416,19 +2415,6 @@ static int cxlflash_probe(struct pci_dev *pdev,
 
 	pci_set_drvdata(pdev, cfg);
 
-	/*
-	 * Use the special service provided to look up the physical
-	 * PCI device, since we are called on the probe of the virtual
-	 * PCI host bus (vphb)
-	 */
-	phys_dev = cxl_get_phys_dev(pdev);
-	if (!dev_is_pci(phys_dev)) {
-		dev_err(&pdev->dev, "%s: not a pci dev\n", __func__);
-		rc = -ENODEV;
-		goto out_remove;
-	}
-	cfg->parent_dev = to_pci_dev(phys_dev);
-
 	cfg->cxl_afu = cxl_pci_to_afu(pdev);
 
 	rc = init_pci(cfg);