linux-kernel - [PATCH v10 5/6] PCI: endpoint: makeup pci-epf-vntb.c

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Message-Id: <20220913210957.3493826-6-Frank.Li@nxp.com>
Date:   Tue, 13 Sep 2022 16:09:56 -0500
From:   Frank Li <Frank.Li@....com>
To:     maz@...nel.org, tglx@...utronix.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kw@...ux.com, bhelgaas@...gle.com
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        peng.fan@....com, aisheng.dong@....com, jdmason@...zu.us,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        kishon@...com, lorenzo.pieralisi@....com, ntb@...ts.linux.dev,
        lznuaa@...il.com, imx@...ts.linux.dev,
        manivannan.sadhasivam@...aro.org
Subject: [PATCH v10 5/6] PCI: endpoint: makeup pci-epf-vntb.c

Remove unused field: epf_db_phy.
Remove __iomem before epf_db.
Remove dupicate check if (readl(ntb->epf_db + i * 4)).
Using readl_relaxed instead of readl.
Using marco ENTRY_SIZE instead of number 4 at all place.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 38 +++++++++----------
 1 file changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 1466dd1904175..17f030befde52 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -67,6 +67,8 @@ static struct workqueue_struct *kpcintb_workqueue;
 #define MAX_DB_COUNT			32
 #define MAX_MW				4
 
+#define ENTRY_SIZE			4
+
 enum epf_ntb_bar {
 	BAR_CONFIG,
 	BAR_DB,
@@ -136,8 +138,7 @@ struct epf_ntb {
 
 	struct epf_ntb_ctrl *reg;
 
-	phys_addr_t epf_db_phy;
-	void __iomem *epf_db;
+	void *epf_db;
 
 	phys_addr_t vpci_mw_phy[MAX_MW];
 	void __iomem *vpci_mw_addr[MAX_MW];
@@ -254,12 +255,9 @@ static void epf_ntb_cmd_handler(struct work_struct *work)
 	ntb = container_of(work, struct epf_ntb, cmd_handler.work);
 
 	for (i = 1; i < ntb->db_count; i++) {
-		if (readl(ntb->epf_db + i * 4)) {
-			if (readl(ntb->epf_db + i * 4))
-				ntb->db |= 1 << (i - 1);
-
+		if (readl_relaxed(ntb->epf_db + i * ENTRY_SIZE)) {
 			ntb_db_event(&ntb->ntb, i);
-			writel(0, ntb->epf_db + i * 4);
+			writel(0, ntb->epf_db + i * ENTRY_SIZE);
 		}
 	}
 
@@ -424,7 +422,7 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb)
 	spad_count = ntb->spad_count;
 
 	ctrl_size = sizeof(struct epf_ntb_ctrl);
-	spad_size = 2 * spad_count * 4;
+	spad_size = 2 * spad_count * ENTRY_SIZE;
 
 	if (!align) {
 		ctrl_size = roundup_pow_of_two(ctrl_size);
@@ -454,7 +452,7 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb)
 	ctrl->num_mws = ntb->num_mws;
 	ntb->spad_size = spad_size;
 
-	ctrl->db_entry_size = 4;
+	ctrl->db_entry_size = ENTRY_SIZE;
 
 	for (i = 0; i < ntb->db_count; i++) {
 		ntb->reg->db_data[i] = 1 + i;
@@ -516,13 +514,15 @@ static int epf_ntb_configure_interrupt(struct epf_ntb *ntb)
 static int epf_ntb_db_bar_init(struct epf_ntb *ntb)
 {
 	const struct pci_epc_features *epc_features;
-	u32 align;
 	struct device *dev = &ntb->epf->dev;
-	int ret;
 	struct pci_epf_bar *epf_bar;
-	void __iomem *mw_addr;
 	enum pci_barno barno;
-	size_t size = 4 * ntb->db_count;
+	void *mw_addr;
+	size_t size;
+	u32 align;
+	int ret;
+
+	size = ENTRY_SIZE * ntb->db_count;
 
 	epc_features = pci_epc_get_features(ntb->epf->epc,
 					    ntb->epf->func_no,
@@ -1084,11 +1084,11 @@ static int vntb_epf_link_enable(struct ntb_dev *ntb,
 static u32 vntb_epf_spad_read(struct ntb_dev *ndev, int idx)
 {
 	struct epf_ntb *ntb = ntb_ndev(ndev);
-	int off = ntb->reg->spad_offset, ct = ntb->reg->spad_count * 4;
+	int off = ntb->reg->spad_offset, ct = ntb->reg->spad_count * ENTRY_SIZE;
 	u32 val;
 	void __iomem *base = ntb->reg;
 
-	val = readl(base + off + ct + idx * 4);
+	val = readl(base + off + ct + idx * ENTRY_SIZE);
 	return val;
 }
 
@@ -1096,10 +1096,10 @@ static int vntb_epf_spad_write(struct ntb_dev *ndev, int idx, u32 val)
 {
 	struct epf_ntb *ntb = ntb_ndev(ndev);
 	struct epf_ntb_ctrl *ctrl = ntb->reg;
-	int off = ctrl->spad_offset, ct = ctrl->spad_count * 4;
+	int off = ctrl->spad_offset, ct = ctrl->spad_count * ENTRY_SIZE;
 	void __iomem *base = ntb->reg;
 
-	writel(val, base + off + ct + idx * 4);
+	writel(val, base + off + ct + idx * ENTRY_SIZE);
 	return 0;
 }
 
@@ -1111,7 +1111,7 @@ static u32 vntb_epf_peer_spad_read(struct ntb_dev *ndev, int pidx, int idx)
 	void __iomem *base = ntb->reg;
 	u32 val;
 
-	val = readl(base + off + idx * 4);
+	val = readl(base + off + idx * ENTRY_SIZE);
 	return val;
 }
 
@@ -1122,7 +1122,7 @@ static int vntb_epf_peer_spad_write(struct ntb_dev *ndev, int pidx, int idx, u32
 	int off = ctrl->spad_offset;
 	void __iomem *base = ntb->reg;
 
-	writel(val, base + off + idx * 4);
+	writel(val, base + off + idx * ENTRY_SIZE);
 	return 0;
 }
 
-- 
2.35.1