linux-kernel - Re: [PATCH v2 1/3] PCI: mediatek: Allocate MSI address with dmam_alloc

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Message-ID: <20240608090152.GB3282@thinkpad>
Date: Sat, 8 Jun 2024 14:31:52 +0530
From: Manivannan Sadhasivam <mani@...nel.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>,
	Marc Zyngier <maz@...nel.org>, 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,
	jieyy.yang@...iatek.com, chuanjia.liu@...iatek.com,
	qizhong.cheng@...iatek.com, jian.yang@...iatek.com,
	jianguo.zhang@...iatek.com
Subject: Re: [PATCH v2 1/3] PCI: mediatek: Allocate MSI address with
 dmam_alloc_coherent()

On Mon, Dec 11, 2023 at 04:52:54PM +0800, Jianjun Wang wrote:
> Use dmam_alloc_coherent() to allocate the MSI address, instead of using
> virt_to_phys().
> 

What is the reason for this change? So now PCIE_MSI_VECTOR becomes unused?

- Mani

> Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> ---
>  drivers/pci/controller/pcie-mediatek.c | 24 ++++++++++++++++--------
>  1 file changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index 66a8f73296fc..2fb9e44369f8 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;
>  
> @@ -494,6 +494,14 @@ static struct msi_domain_info mtk_msi_domain_info = {
>  static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
>  {
>  	struct fwnode_handle *fwnode = of_node_to_fwnode(port->pcie->dev->of_node);
> +	void *msi_vaddr;
> +
> +	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 address\n");
> +		return -ENOMEM;
> +	}
>  
>  	mutex_init(&port->lock);
>  
> @@ -501,6 +509,7 @@ static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
>  						      &msi_domain_ops, port);
>  	if (!port->inner_domain) {
>  		dev_err(port->pcie->dev, "failed to create IRQ domain\n");
> +		dmam_free_coherent(port->pcie->dev, sizeof(dma_addr_t), msi_vaddr, port->msg_addr);
>  		return -ENOMEM;
>  	}
>  
> @@ -508,6 +517,7 @@ static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
>  						     port->inner_domain);
>  	if (!port->msi_domain) {
>  		dev_err(port->pcie->dev, "failed to create MSI domain\n");
> +		dmam_free_coherent(port->pcie->dev, sizeof(dma_addr_t), msi_vaddr, port->msg_addr);
>  		irq_domain_remove(port->inner_domain);
>  		return -ENOMEM;
>  	}
> @@ -518,10 +528,8 @@ 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);
> @@ -588,7 +596,7 @@ static int mtk_pcie_init_irq_domain(struct mtk_pcie_port *port,
>  	if (IS_ENABLED(CONFIG_PCI_MSI)) {
>  		ret = mtk_pcie_allocate_msi_domains(port);
>  		if (ret)
> -			return ret;
> +			dev_warn(dev, "no MSI supported, only INTx available\n");
>  	}
>  
>  	return 0;
> @@ -732,7 +740,7 @@ 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))
> +	if (IS_ENABLED(CONFIG_PCI_MSI) && port->msi_domain)
>  		mtk_pcie_enable_msi(port);
>  
>  	/* Set AHB to PCIe translation windows */
> -- 
> 2.18.0
> 
> 

-- 
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