linux-kernel - [PATCH 1/2] PCI: mediatek: Allocate MSI address with dmam_alloc

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Message-ID: <20231206083753.18186-2-jianjun.wang@mediatek.com>
Date:   Wed, 6 Dec 2023 16:37:52 +0800
From:   Jianjun Wang <jianjun.wang@...iatek.com>
To:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     Ryder Lee <ryder.lee@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        <linux-pci@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <jieyy.yang@...iatek.com>,
        <chuanjia.liu@...iatek.com>, <qizhong.cheng@...iatek.com>,
        <jian.yang@...iatek.com>, <jianguo.zhang@...iatek.com>
Subject: [PATCH 1/2] PCI: mediatek: Allocate MSI address with dmam_alloc_coherent

Use 'dmam_alloc_coherent' to allocate the MSI address, instead of using
'virt_to_phys'.

Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
---
 drivers/pci/controller/pcie-mediatek.c | 29 ++++++++++++++++++--------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 66a8f73296fc..b080f7ca6da0 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -178,6 +178,7 @@ struct mtk_pcie_soc {
  * @phy: pointer to PHY control block
  * @slot: port slot
  * @irq: GIC irq
+ * @msg_addr: MSI message address
  * @irq_domain: legacy INTx IRQ domain
  * @inner_domain: inner IRQ domain
  * @msi_domain: MSI IRQ domain
@@ -198,6 +199,7 @@ struct mtk_pcie_port {
 	struct phy *phy;
 	u32 slot;
 	int irq;
+	dma_addr_t msg_addr;
 	struct irq_domain *irq_domain;
 	struct irq_domain *inner_domain;
 	struct irq_domain *msi_domain;
@@ -394,12 +396,10 @@ static struct pci_ops mtk_pcie_ops_v2 = {
 static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 {
 	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
-	phys_addr_t addr;
 
 	/* MT2712/MT7622 only support 32-bit MSI addresses */
-	addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
 	msg->address_hi = 0;
-	msg->address_lo = lower_32_bits(addr);
+	msg->address_lo = lower_32_bits(port->msg_addr);
 
 	msg->data = data->hwirq;
 
@@ -515,18 +515,26 @@ static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
 	return 0;
 }
 
-static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
+static int mtk_pcie_enable_msi(struct mtk_pcie_port *port)
 {
 	u32 val;
-	phys_addr_t msg_addr;
+	void *msi_vaddr;
 
-	msg_addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
-	val = lower_32_bits(msg_addr);
+	msi_vaddr = dmam_alloc_coherent(port->pcie->dev, sizeof(dma_addr_t), &port->msg_addr,
+					GFP_KERNEL);
+	if (!msi_vaddr) {
+		dev_err(port->pcie->dev, "failed to alloc and map MSI data\n");
+		return -ENOMEM;
+	}
+
+	val = lower_32_bits(port->msg_addr);
 	writel(val, port->base + PCIE_IMSI_ADDR);
 
 	val = readl(port->base + PCIE_INT_MASK);
 	val &= ~MSI_MASK;
 	writel(val, port->base + PCIE_INT_MASK);
+
+	return 0;
 }
 
 static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
@@ -732,8 +740,11 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
 	val &= ~INTX_MASK;
 	writel(val, port->base + PCIE_INT_MASK);
 
-	if (IS_ENABLED(CONFIG_PCI_MSI))
-		mtk_pcie_enable_msi(port);
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		err = mtk_pcie_enable_msi(port);
+		if (err)
+			return err;
+	}
 
 	/* Set AHB to PCIe translation windows */
 	val = lower_32_bits(mem->start) |
-- 
2.18.0