linux-kernel - Re: [PATCH] PCI: mediatek: Remove the usage of virt_to

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Message-ID: <20250115173156.a73ntoyyn3xy52ze@thinkpad>
Date: Wed, 15 Jan 2025 23:01:56 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Jianjun Wang <jianjun.wang@...iatek.com>
Cc: 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>,
	Ryder Lee <ryder.lee@...iatek.com>, linux-pci@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] PCI: mediatek: Remove the usage of virt_to_phys

On Tue, Jan 07, 2025 at 01:20:58PM +0800, Jianjun Wang wrote:
> Remove the usage of virt_to_phys, as it will cause sparse warnings when
> building on some platforms.
> 

Strange. What are those warnings and platforms?

- Mani

> Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> ---
>  drivers/pci/controller/pcie-mediatek.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index 3bcfc4e58ba2..dc1e5fd6c7aa 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;
> +	phys_addr_t msg_addr;
>  	struct irq_domain *irq_domain;
>  	struct irq_domain *inner_domain;
>  	struct irq_domain *msi_domain;
> @@ -393,12 +395,10 @@ 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;
>  
> @@ -510,10 +510,8 @@ static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
>  static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
>  {
>  	u32 val;
> -	phys_addr_t msg_addr;
>  
> -	msg_addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
> -	val = lower_32_bits(msg_addr);
> +	val = lower_32_bits(port->msg_addr);
>  	writel(val, port->base + PCIE_IMSI_ADDR);
>  
>  	val = readl(port->base + PCIE_INT_MASK);
> @@ -913,6 +911,7 @@ static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
>  	struct mtk_pcie_port *port;
>  	struct device *dev = pcie->dev;
>  	struct platform_device *pdev = to_platform_device(dev);
> +	struct resource *regs;
>  	char name[10];
>  	int err;
>  
> @@ -921,12 +920,18 @@ static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
>  		return -ENOMEM;
>  
>  	snprintf(name, sizeof(name), "port%d", slot);
> -	port->base = devm_platform_ioremap_resource_byname(pdev, name);
> +	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
> +	if (!regs)
> +		return -EINVAL;
> +
> +	port->base = devm_ioremap_resource(dev, regs);
>  	if (IS_ERR(port->base)) {
>  		dev_err(dev, "failed to map port%d base\n", slot);
>  		return PTR_ERR(port->base);
>  	}
>  
> +	port->msg_addr = regs->start + PCIE_MSI_VECTOR;
> +
>  	snprintf(name, sizeof(name), "sys_ck%d", slot);
>  	port->sys_ck = devm_clk_get(dev, name);
>  	if (IS_ERR(port->sys_ck)) {
> -- 
> 2.46.0
> 

-- 
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