[PATCH 06/15] PCI: endpoint: pci-epf-vntb: Fold MW runtime state into a struct

[Koichiro Den]

The next patches add per-memory-window offsets, shared BAR placement,
and optional DMA export state. Keeping per-window state in parallel
arrays would make that work noisy and error-prone.

Group the runtime memory-window state into struct epf_ntb_mw so
follow-up changes can extend a single object instead of touching
multiple arrays.

No functional change intended.

Signed-off-by: Koichiro Den <den@xxxxxxxxxxxxx>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 42 ++++++++++---------
 1 file changed, 23 insertions(+), 19 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index bd9a3380a537..16656659a9ce 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -128,6 +128,12 @@ struct epf_ntb_ctrl {
 	u32 db_offset[MAX_DB_COUNT];
 } __packed;
 
+struct epf_ntb_mw {
+	u64 size;
+	phys_addr_t vpci_mw_phys;
+	void __iomem *vpci_mw_addr;
+};
+
 struct epf_ntb {
 	struct ntb_dev ntb;
 	struct pci_epf *epf;
@@ -136,7 +142,7 @@ struct epf_ntb {
 	u32 num_mws;
 	u32 db_count;
 	u32 spad_count;
-	u64 mws_size[MAX_MW];
+	struct epf_ntb_mw mw[MAX_MW];
 	atomic64_t db;
 	atomic64_t peer_db_pending;
 	struct work_struct peer_db_work;
@@ -159,9 +165,6 @@ struct epf_ntb {
 
 	u32 *epf_db;
 
-	phys_addr_t vpci_mw_phy[MAX_MW];
-	void __iomem *vpci_mw_addr[MAX_MW];
-
 	struct delayed_work cmd_handler;
 };
 
@@ -227,7 +230,7 @@ static int epf_ntb_configure_mw(struct epf_ntb *ntb, u32 mw)
 	u64 addr, size;
 	int ret = 0;
 
-	phys_addr = ntb->vpci_mw_phy[mw];
+	phys_addr = ntb->mw[mw].vpci_mw_phys;
 	addr = ntb->reg->addr;
 	size = ntb->reg->size;
 
@@ -254,7 +257,7 @@ static void epf_ntb_teardown_mw(struct epf_ntb *ntb, u32 mw)
 	pci_epc_unmap_addr(ntb->epf->epc,
 			   ntb->epf->func_no,
 			   ntb->epf->vfunc_no,
-			   ntb->vpci_mw_phy[mw]);
+			   ntb->mw[mw].vpci_mw_phys);
 }
 
 /**
@@ -763,7 +766,7 @@ static int epf_ntb_mw_bar_init(struct epf_ntb *ntb)
 	struct device *dev = &ntb->epf->dev;
 
 	for (i = 0; i < ntb->num_mws; i++) {
-		size = ntb->mws_size[i];
+		size = ntb->mw[i].size;
 		barno = ntb->epf_ntb_bar[BAR_MW1 + i];
 
 		ntb->epf->bar[barno].barno = barno;
@@ -784,10 +787,11 @@ static int epf_ntb_mw_bar_init(struct epf_ntb *ntb)
 		}
 
 		/* Allocate EPC outbound memory windows to vpci vntb device */
-		ntb->vpci_mw_addr[i] = pci_epc_mem_alloc_addr(ntb->epf->epc,
-							      &ntb->vpci_mw_phy[i],
-							      size);
-		if (!ntb->vpci_mw_addr[i]) {
+		ntb->mw[i].vpci_mw_addr =
+				pci_epc_mem_alloc_addr(ntb->epf->epc,
+						       &ntb->mw[i].vpci_mw_phys,
+						       size);
+		if (!ntb->mw[i].vpci_mw_addr) {
 			ret = -ENOMEM;
 			dev_err(dev, "Failed to allocate source address\n");
 			goto err_set_bar;
@@ -824,9 +828,9 @@ static void epf_ntb_mw_bar_clear(struct epf_ntb *ntb, int num_mws)
 				  &ntb->epf->bar[barno]);
 
 		pci_epc_mem_free_addr(ntb->epf->epc,
-				      ntb->vpci_mw_phy[i],
-				      ntb->vpci_mw_addr[i],
-				      ntb->mws_size[i]);
+				      ntb->mw[i].vpci_mw_phys,
+				      ntb->mw[i].vpci_mw_addr,
+				      ntb->mw[i].size);
 	}
 }
 
@@ -1065,7 +1069,7 @@ static ssize_t epf_ntb_##_name##_show(struct config_item *item,		\
 		return -ERANGE;						\
 	}								\
 	idx = array_index_nospec(idx, ntb->num_mws);			\
-	return sprintf(page, "%llu\n", ntb->mws_size[idx]);		\
+	return sprintf(page, "%llu\n", ntb->mw[idx].size);		\
 }
 
 #define EPF_NTB_MW_W(_name)						\
@@ -1093,7 +1097,7 @@ static ssize_t epf_ntb_##_name##_store(struct config_item *item,	\
 		return -ERANGE;						\
 	}								\
 	idx = array_index_nospec(idx, ntb->num_mws);			\
-	ntb->mws_size[idx] = val;					\
+	ntb->mw[idx].size = val;					\
 									\
 	return len;							\
 }
@@ -1400,10 +1404,10 @@ static int vntb_epf_peer_mw_get_addr(struct ntb_dev *ndev, int idx,
 	struct epf_ntb *ntb = ntb_ndev(ndev);
 
 	if (base)
-		*base = ntb->vpci_mw_phy[idx];
+		*base = ntb->mw[idx].vpci_mw_phys;
 
 	if (size)
-		*size = ntb->mws_size[idx];
+		*size = ntb->mw[idx].size;
 
 	return 0;
 }
@@ -1556,7 +1560,7 @@ static int vntb_epf_mw_get_align(struct ntb_dev *ndev, int pidx, int idx,
 		*size_align = 1;
 
 	if (size_max)
-		*size_max = ntb->mws_size[idx];
+		*size_max = ntb->mw[idx].size;
 
 	return 0;
 }
-- 
2.51.0