On Sun, May 15, 2022 at 02:58:15PM +0200, Pali Rohár wrote:
> This reverts commit 1571d67dc190e50c6c56e8f88cdc39f7cc53166e.
>
> This commit broke support for setting interrupt affinity. It looks like
> that it is related to the chained IRQ handler. Revert this commit until
> issue with setting interrupt affinity is fixed.
>
> Fixes: 1571d67dc190 ("PCI: aardvark: Rewrite IRQ code to chained IRQ handler")
> Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
>
> ---
> This commit was introduced in v5.18-rc1 and hence it is regression for 5.18
> release. After reverting this commit, it is possible to move aardvark
> interrupt from CPU0 to CPU1 by "echo 2 > /proc/irq/XX/smp_affinity" where
> XX is the interrupt number which can be find in /proc/interrupts on line
> with advk-pcie.
Applied to for-linus for v5.18, thanks, Pali!
> ---
> drivers/pci/controller/pci-aardvark.c | 48 ++++++++++++---------------
> 1 file changed, 22 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> index 54651a1808cc..22ac607343bd 100644
> --- a/drivers/pci/controller/pci-aardvark.c
> +++ b/drivers/pci/controller/pci-aardvark.c
> @@ -274,7 +274,6 @@ struct advk_pcie {
> u32 actions;
> } wins[OB_WIN_COUNT];
> u8 wins_count;
> - int irq;
> struct irq_domain *rp_irq_domain;
> struct irq_domain *irq_domain;
> struct irq_chip irq_chip;
> @@ -1664,26 +1663,21 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
> }
> }
>
> -static void advk_pcie_irq_handler(struct irq_desc *desc)
> +static irqreturn_t advk_pcie_irq_handler(int irq, void *arg)
> {
> - struct advk_pcie *pcie = irq_desc_get_handler_data(desc);
> - struct irq_chip *chip = irq_desc_get_chip(desc);
> - u32 val, mask, status;
> + struct advk_pcie *pcie = arg;
> + u32 status;
>
> - chained_irq_enter(chip, desc);
> + status = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG);
> + if (!(status & PCIE_IRQ_CORE_INT))
> + return IRQ_NONE;
>
> - val = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG);
> - mask = advk_readl(pcie, HOST_CTRL_INT_MASK_REG);
> - status = val & ((~mask) & PCIE_IRQ_ALL_MASK);
> + advk_pcie_handle_int(pcie);
>
> - if (status & PCIE_IRQ_CORE_INT) {
> - advk_pcie_handle_int(pcie);
> + /* Clear interrupt */
> + advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG);
>
> - /* Clear interrupt */
> - advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG);
> - }
> -
> - chained_irq_exit(chip, desc);
> + return IRQ_HANDLED;
> }
>
> static int advk_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
> @@ -1763,7 +1757,7 @@ static int advk_pcie_probe(struct platform_device *pdev)
> struct advk_pcie *pcie;
> struct pci_host_bridge *bridge;
> struct resource_entry *entry;
> - int ret;
> + int ret, irq;
>
> bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct advk_pcie));
> if (!bridge)
> @@ -1849,9 +1843,17 @@ static int advk_pcie_probe(struct platform_device *pdev)
> if (IS_ERR(pcie->base))
> return PTR_ERR(pcie->base);
>
> - pcie->irq = platform_get_irq(pdev, 0);
> - if (pcie->irq < 0)
> - return pcie->irq;
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + ret = devm_request_irq(dev, irq, advk_pcie_irq_handler,
> + IRQF_SHARED | IRQF_NO_THREAD, "advk-pcie",
> + pcie);
> + if (ret) {
> + dev_err(dev, "Failed to register interrupt\n");
> + return ret;
> + }
>
> pcie->reset_gpio = devm_gpiod_get_from_of_node(dev, dev->of_node,
> "reset-gpios", 0,
> @@ -1916,15 +1918,12 @@ static int advk_pcie_probe(struct platform_device *pdev)
> return ret;
> }
>
> - irq_set_chained_handler_and_data(pcie->irq, advk_pcie_irq_handler, pcie);
> -
> bridge->sysdata = pcie;
> bridge->ops = &advk_pcie_ops;
> bridge->map_irq = advk_pcie_map_irq;
>
> ret = pci_host_probe(bridge);
> if (ret < 0) {
> - irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
> advk_pcie_remove_rp_irq_domain(pcie);
> advk_pcie_remove_msi_irq_domain(pcie);
> advk_pcie_remove_irq_domain(pcie);
> @@ -1973,9 +1972,6 @@ static int advk_pcie_remove(struct platform_device *pdev)
> advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG);
> advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG);
>
> - /* Remove IRQ handler */
> - irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
> -
> /* Remove IRQ domains */
> advk_pcie_remove_rp_irq_domain(pcie);
> advk_pcie_remove_msi_irq_domain(pcie);
> --
> 2.20.1
>
>
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