PCI: endpoint: pci-epf-vntb: Align MW naming with config names

The config file related to the memory windows start the numbering of
the MW from 1. The other NTB function does the same, yet the enumeration
defining the BARs of the vNTB function starts numbering the MW from 0.

Both numbering should be fine, but mixing the two is a bit confusing. The
configfs file being the interface with userspace, keep that stable and
consistently start the numbering of the MW from 1.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
[mani: commit message rewording]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20250603-pci-vntb-bar-mapping-v2-2-fc685a22ad28@baylibre.com

Author: jbrun3t

drivers/pci/endpoint/functions/pci-epf-vntb.c

@@ -70,9 +70,9 @@ static struct workqueue_struct *kpcintb_workqueue;
 enum epf_ntb_bar {
 	BAR_CONFIG,
 	BAR_DB,
-	BAR_MW0,
 	BAR_MW1,
 	BAR_MW2,
+	BAR_MW3,
 };
 
 /*
@@ -576,7 +576,7 @@ static int epf_ntb_mw_bar_init(struct epf_ntb *ntb)
 
 	for (i = 0; i < ntb->num_mws; i++) {
 		size = ntb->mws_size[i];
-		barno = ntb->epf_ntb_bar[BAR_MW0 + i];
+		barno = ntb->epf_ntb_bar[BAR_MW1 + i];
 
 		ntb->epf->bar[barno].barno = barno;
 		ntb->epf->bar[barno].size = size;
@@ -629,7 +629,7 @@ static void epf_ntb_mw_bar_clear(struct epf_ntb *ntb, int num_mws)
 	int i;
 
 	for (i = 0; i < num_mws; i++) {
-		barno = ntb->epf_ntb_bar[BAR_MW0 + i];
+		barno = ntb->epf_ntb_bar[BAR_MW1 + i];
 		pci_epc_clear_bar(ntb->epf->epc,
 				  ntb->epf->func_no,
 				  ntb->epf->vfunc_no,
@@ -676,7 +676,7 @@ static int epf_ntb_init_epc_bar(struct epf_ntb *ntb)
 	epc_features = pci_epc_get_features(ntb->epf->epc, ntb->epf->func_no, ntb->epf->vfunc_no);
 
 	/* These are required BARs which are mandatory for NTB functionality */
-	for (bar = BAR_CONFIG; bar <= BAR_MW0; bar++, barno++) {
+	for (bar = BAR_CONFIG; bar <= BAR_MW1; bar++, barno++) {
 		barno = pci_epc_get_next_free_bar(epc_features, barno);
 		if (barno < 0) {
 			dev_err(dev, "Fail to get NTB function BAR\n");
@@ -1048,7 +1048,7 @@ static int vntb_epf_mw_set_trans(struct ntb_dev *ndev, int pidx, int idx,
 	struct device *dev;
 
 	dev = &ntb->ntb.dev;
-	barno = ntb->epf_ntb_bar[BAR_MW0 + idx];
+	barno = ntb->epf_ntb_bar[BAR_MW1 + idx];
 	epf_bar = &ntb->epf->bar[barno];
 	epf_bar->phys_addr = addr;
 	epf_bar->barno = barno;