linux-kernel - Re: [PATCH] PCI: uniphier: Serialize INTx masking/unmasking

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Message-ID: <20210823150927.jhobzfxy6e4s663r@pali>
Date:   Mon, 23 Aug 2021 17:09:27 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: uniphier: Serialize INTx masking/unmasking

+ Marc (who originally reported this issue)

On Monday 23 August 2021 20:18:20 Kunihiko Hayashi wrote:
> The condition register PCI_RCV_INTX is used in irq_mask(), irq_unmask()
> and irq_ack() callbacks. Accesses to register can occur at the same time
> without a lock.
> Add a lock into each callback to prevent the issue.
> 
> Fixes: 7e6d5cd88a6f ("PCI: uniphier: Add UniPhier PCIe host controller support")
> Suggested-by: Pali Rohár <pali@...nel.org>
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>

Acked-by: Pali Rohár <pali@...nel.org>

> ---
>  drivers/pci/controller/dwc/pcie-uniphier.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> The previous patch is as follows:
> https://lore.kernel.org/linux-pci/1629370566-29984-1-git-send-email-hayashi.kunihiko@socionext.com/
> 
> Changes in the previous patch:
> - Change the subject and commit message
> 
> diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
> index ebe43e9..5075714 100644
> --- a/drivers/pci/controller/dwc/pcie-uniphier.c
> +++ b/drivers/pci/controller/dwc/pcie-uniphier.c
> @@ -186,12 +186,17 @@ static void uniphier_pcie_irq_ack(struct irq_data *d)
>  	struct pcie_port *pp = irq_data_get_irq_chip_data(d);
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct uniphier_pcie_priv *priv = to_uniphier_pcie(pci);
> +	unsigned long flags;
>  	u32 val;
>  
> +	raw_spin_lock_irqsave(&pp->lock, flags);
> +
>  	val = readl(priv->base + PCL_RCV_INTX);
>  	val &= ~PCL_RCV_INTX_ALL_STATUS;
>  	val |= BIT(irqd_to_hwirq(d) + PCL_RCV_INTX_STATUS_SHIFT);
>  	writel(val, priv->base + PCL_RCV_INTX);
> +
> +	raw_spin_unlock_irqrestore(&pp->lock, flags);
>  }
>  
>  static void uniphier_pcie_irq_mask(struct irq_data *d)
> @@ -199,12 +204,17 @@ static void uniphier_pcie_irq_mask(struct irq_data *d)
>  	struct pcie_port *pp = irq_data_get_irq_chip_data(d);
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct uniphier_pcie_priv *priv = to_uniphier_pcie(pci);
> +	unsigned long flags;
>  	u32 val;
>  
> +	raw_spin_lock_irqsave(&pp->lock, flags);
> +
>  	val = readl(priv->base + PCL_RCV_INTX);
>  	val &= ~PCL_RCV_INTX_ALL_MASK;
>  	val |= BIT(irqd_to_hwirq(d) + PCL_RCV_INTX_MASK_SHIFT);
>  	writel(val, priv->base + PCL_RCV_INTX);
> +
> +	raw_spin_unlock_irqrestore(&pp->lock, flags);
>  }
>  
>  static void uniphier_pcie_irq_unmask(struct irq_data *d)
> @@ -212,12 +222,17 @@ static void uniphier_pcie_irq_unmask(struct irq_data *d)
>  	struct pcie_port *pp = irq_data_get_irq_chip_data(d);
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct uniphier_pcie_priv *priv = to_uniphier_pcie(pci);
> +	unsigned long flags;
>  	u32 val;
>  
> +	raw_spin_lock_irqsave(&pp->lock, flags);
> +
>  	val = readl(priv->base + PCL_RCV_INTX);
>  	val &= ~PCL_RCV_INTX_ALL_MASK;
>  	val &= ~BIT(irqd_to_hwirq(d) + PCL_RCV_INTX_MASK_SHIFT);
>  	writel(val, priv->base + PCL_RCV_INTX);
> +
> +	raw_spin_unlock_irqrestore(&pp->lock, flags);
>  }
>  
>  static struct irq_chip uniphier_pcie_irq_chip = {
> -- 
> 2.7.4
>