Dmitry Tunin <hanipouspi...@gmail.com> 于2018年8月22日周三 下午5:07写道：
>
> Currently all PCI devices get the same IRQ that affects performance badly.
>
> This commit adresses this problem and cleans the code.
>
> ar7100 has a special PCI interrupt controller@18060018 that works exactly
> the same way as misc interrupt controller.
>
> This patch does the following:
>
> 1. Removes all IRQ handling code from the PCI driver.
> 2. Defines pci-intc interrupt controller@18060018 in dtsi.
> 3. Removes interrupt-controller property from PCI node.
> 4. Sets a correct interrupt mask for PCI devices.
>
> Run tested on DIR-825 B1.
>
> Signed-off-by: Dmitry Tunin <hanipouspi...@gmail.com>
> ---
> target/linux/ath79/dts/ar7100.dtsi | 21 +++-
> .../0036-MIPS-ath79-remove-irq-code-from-pci.patch | 117
> +++++++++++++++++++++
> 2 files changed, 133 insertions(+), 5 deletions(-)
> create mode 100644
> target/linux/ath79/patches-4.14/0036-MIPS-ath79-remove-irq-code-from-pci.patch
>
> diff --git a/target/linux/ath79/dts/ar7100.dtsi
> b/target/linux/ath79/dts/ar7100.dtsi
> index 8994a7d..0632050 100644
> --- a/target/linux/ath79/dts/ar7100.dtsi
> +++ b/target/linux/ath79/dts/ar7100.dtsi
> @@ -88,6 +88,14 @@
> clock-names = "wdt";
> };
>
> + pci_intc: interrupt-controller@18060018 {
> + compatible = "qca,ar7240-misc-intc";
> + reg = <0x18060018 0x4>;
I guess this should be <0x18060018 0x8>?
Interrupt status is at 0x18060018-0x1806001c and interrupt mask is at
0x1806001c-0x18060020. The length of used memory space is 8 bytes.
BTW I noticed that reg of miscintc is <0x18060010 0x4> but the
register of interrupt status and mask is 0x18060010-0x18060018, also 8
bytes.
Are these two mistakes or my misunderstanding of the size in reg property?
> + interrupt-parent = <&cpuintc>;
> + interrupts = <2>;
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + };
>
> rst: reset-controller@18060024 {
> compatible = "qca,ar7100-reset";
> @@ -105,14 +113,17 @@
> reg-names = "cfg_base";
> ranges = <0x2000000 0 0x10000000 0x10000000 0
> 0x07000000 /* pci memory */
> 0x1000000 0 0x00000000 0x0000000 0
> 0x000001>; /* io space */
> - interrupt-parent = <&cpuintc>;
> - interrupts = <2>;
>
> - interrupt-controller;
> + interrupt-parent = <&pci_intc>;
> + interrupts = <4>;
> +
> #interrupt-cells = <1>;
>
> - interrupt-map-mask = <0 0 0 1>;
> - interrupt-map = <0 0 0 0 &pcie0 0>;
> + interrupt-map-mask = <0xf800 0 0 0>;
> + interrupt-map = <0x8800 0 0 0 &pci_intc 0
> + 0x9000 0 0 0 &pci_intc 1
> + 0x9800 0 0 0 &pci_intc 2>;
> +
> status = "disabled";
> };
> };
> diff --git
> a/target/linux/ath79/patches-4.14/0036-MIPS-ath79-remove-irq-code-from-pci.patch
>
> b/target/linux/ath79/patches-4.14/0036-MIPS-ath79-remove-irq-code-from-pci.patch
> new file mode 100644
> index 0000000..b3fc19a
> --- /dev/null
> +++
> b/target/linux/ath79/patches-4.14/0036-MIPS-ath79-remove-irq-code-from-pci.patch
> @@ -0,0 +1,117 @@
> +Index: linux-4.14.65/arch/mips/pci/pci-ar71xx.c
> +===================================================================
> +--- linux-4.14.65.orig/arch/mips/pci/pci-ar71xx.c
> ++++ linux-4.14.65/arch/mips/pci/pci-ar71xx.c
> +@@ -269,103 +269,6 @@ static struct pci_ops ar71xx_pci_ops = {
> + .write = ar71xx_pci_write_config,
> + };
> +
> +-static void ar71xx_pci_irq_handler(struct irq_desc *desc)
> +-{
> +- void __iomem *base = ath79_reset_base;
> +- struct irq_chip *chip = irq_desc_get_chip(desc);
> +- struct ar71xx_pci_controller *apc = irq_desc_get_handler_data(desc);
> +- u32 pending;
> +-
> +- chained_irq_enter(chip, desc);
> +- pending = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_STATUS) &
> +- __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +-
> +- if (pending & AR71XX_PCI_INT_DEV0)
> +- generic_handle_irq(irq_linear_revmap(apc->domain, 1));
> +-
> +- else if (pending & AR71XX_PCI_INT_DEV1)
> +- generic_handle_irq(irq_linear_revmap(apc->domain, 2));
> +-
> +- else if (pending & AR71XX_PCI_INT_DEV2)
> +- generic_handle_irq(irq_linear_revmap(apc->domain, 3));
> +-
> +- else if (pending & AR71XX_PCI_INT_CORE)
> +- generic_handle_irq(irq_linear_revmap(apc->domain, 4));
> +-
> +- else
> +- spurious_interrupt();
> +- chained_irq_exit(chip, desc);
> +-}
> +-
> +-static void ar71xx_pci_irq_unmask(struct irq_data *d)
> +-{
> +- struct ar71xx_pci_controller *apc;
> +- unsigned int irq;
> +- void __iomem *base = ath79_reset_base;
> +- u32 t;
> +-
> +- apc = irq_data_get_irq_chip_data(d);
> +- irq = irq_linear_revmap(apc->domain, d->irq);
> +-
> +- t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +- __raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +-
> +- /* flush write */
> +- __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +-}
> +-
> +-static void ar71xx_pci_irq_mask(struct irq_data *d)
> +-{
> +- struct ar71xx_pci_controller *apc;
> +- unsigned int irq;
> +- void __iomem *base = ath79_reset_base;
> +- u32 t;
> +-
> +- apc = irq_data_get_irq_chip_data(d);
> +- irq = irq_linear_revmap(apc->domain, d->irq);
> +-
> +- t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +- __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +-
> +- /* flush write */
> +- __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +-}
> +-
> +-static struct irq_chip ar71xx_pci_irq_chip = {
> +- .name = "AR71XX PCI",
> +- .irq_mask = ar71xx_pci_irq_mask,
> +- .irq_unmask = ar71xx_pci_irq_unmask,
> +- .irq_mask_ack = ar71xx_pci_irq_mask,
> +-};
> +-
> +-static int ar71xx_pci_irq_map(struct irq_domain *d, unsigned int irq,
> irq_hw_number_t hw)
> +-{
> +- struct ar71xx_pci_controller *apc = d->host_data;
> +-
> +- irq_set_chip_and_handler(irq, &ar71xx_pci_irq_chip, handle_level_irq);
> +- irq_set_chip_data(irq, apc);
> +-
> +- return 0;
> +-}
> +-
> +-static const struct irq_domain_ops ar71xx_pci_domain_ops = {
> +- .xlate = irq_domain_xlate_onecell,
> +- .map = ar71xx_pci_irq_map,
> +-};
> +-
> +-static void ar71xx_pci_irq_init(struct ar71xx_pci_controller *apc)
> +-{
> +- void __iomem *base = ath79_reset_base;
> +-
> +- __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_ENABLE);
> +- __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
> +-
> +- apc->domain = irq_domain_add_linear(apc->np, AR71XX_PCI_IRQ_COUNT,
> +- &ar71xx_pci_domain_ops, apc);
> +- irq_set_chained_handler_and_data(apc->irq, ar71xx_pci_irq_handler,
> +- apc);
> +-}
> +-
> + static void ar71xx_pci_reset(void)
> + {
> + ath79_device_reset_set(AR71XX_RESET_PCI_BUS | AR71XX_RESET_PCI_CORE);
> +@@ -419,8 +322,6 @@ static int ar71xx_pci_probe(struct platf
> + apc->pci_ctrl.io_resource = &apc->io_res;
> + pci_load_of_ranges(&apc->pci_ctrl, pdev->dev.of_node);
> +
> +- ar71xx_pci_irq_init(apc);
> +-
> + register_pci_controller(&apc->pci_ctrl);
> +
> + __ath79_pci_swizzle_b = ar71xx_pci_swizzle_b;
> --
> 2.7.4
>
>
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