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Message-ID: <20200114153734.GA8268@e121166-lin.cambridge.arm.com>
Date: Tue, 14 Jan 2020 15:37:34 +0000
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: Srinath Mannam <srinath.mannam@...adcom.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Florian Fainelli <f.fainelli@...il.com>,
Ray Jui <rjui@...adcom.com>, Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Andrew Murray <andrew.murray@....com>,
Arnd Bergmann <arnd@...db.de>,
bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, Ray Jui <ray.jui@...adcom.com>,
maz@...nel.org
Subject: Re: [PATCH v4 2/6] PCI: iproc: Add INTx support with better modeling
[+Marc thanks to whom I can review this code with the required IRQ chip
knowledge]
On Fri, Dec 20, 2019 at 09:24:14AM +0530, Srinath Mannam wrote:
> From: Ray Jui <ray.jui@...adcom.com>
>
> Add PCIe legacy interrupt INTx support to the iProc PCIe driver by
> modeling it with its own IRQ domain. All 4 interrupts INTA, INTB, INTC,
> INTD share the same interrupt line connected to the GIC in the system,
> while the status of each INTx can be obtained through the INTX CSR
> register
^
Missing a period.
> Signed-off-by: Ray Jui <ray.jui@...adcom.com>
> Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
> ---
> drivers/pci/controller/pcie-iproc.c | 108 +++++++++++++++++++++++++++++++++++-
> drivers/pci/controller/pcie-iproc.h | 6 ++
> 2 files changed, 112 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> index 0a468c7..485967b 100644
> --- a/drivers/pci/controller/pcie-iproc.c
> +++ b/drivers/pci/controller/pcie-iproc.c
> @@ -14,6 +14,7 @@
> #include <linux/delay.h>
> #include <linux/interrupt.h>
> #include <linux/irqchip/arm-gic-v3.h>
> +#include <linux/irqchip/chained_irq.h>
> #include <linux/platform_device.h>
> #include <linux/of_address.h>
> #include <linux/of_pci.h>
> @@ -270,6 +271,7 @@ enum iproc_pcie_reg {
>
> /* enable INTx */
> IPROC_PCIE_INTX_EN,
> + IPROC_PCIE_INTX_CSR,
>
> /* outbound address mapping */
> IPROC_PCIE_OARR0,
> @@ -314,6 +316,7 @@ static const u16 iproc_pcie_reg_paxb_bcma[] = {
> [IPROC_PCIE_CFG_ADDR] = 0x1f8,
> [IPROC_PCIE_CFG_DATA] = 0x1fc,
> [IPROC_PCIE_INTX_EN] = 0x330,
> + [IPROC_PCIE_INTX_CSR] = 0x334,
> [IPROC_PCIE_LINK_STATUS] = 0xf0c,
> };
>
> @@ -325,6 +328,7 @@ static const u16 iproc_pcie_reg_paxb[] = {
> [IPROC_PCIE_CFG_ADDR] = 0x1f8,
> [IPROC_PCIE_CFG_DATA] = 0x1fc,
> [IPROC_PCIE_INTX_EN] = 0x330,
> + [IPROC_PCIE_INTX_CSR] = 0x334,
> [IPROC_PCIE_OARR0] = 0xd20,
> [IPROC_PCIE_OMAP0] = 0xd40,
> [IPROC_PCIE_OARR1] = 0xd28,
> @@ -341,6 +345,7 @@ static const u16 iproc_pcie_reg_paxb_v2[] = {
> [IPROC_PCIE_CFG_ADDR] = 0x1f8,
> [IPROC_PCIE_CFG_DATA] = 0x1fc,
> [IPROC_PCIE_INTX_EN] = 0x330,
> + [IPROC_PCIE_INTX_CSR] = 0x334,
> [IPROC_PCIE_OARR0] = 0xd20,
> [IPROC_PCIE_OMAP0] = 0xd40,
> [IPROC_PCIE_OARR1] = 0xd28,
> @@ -846,9 +851,103 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
> return link_is_active ? 0 : -ENODEV;
> }
>
> -static void iproc_pcie_enable(struct iproc_pcie *pcie)
> +static int iproc_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> + irq_hw_number_t hwirq)
> {
> + irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
This looks wrong.
Don't tell me there are other PCI controllers drivers implementing this
code so you copied and pasted it; I know that and they are all wrong.
Legacy PCI IRQs are level IRQs so they must be masked/unmasked upon IRQ
entry/exit.
Therefore the IRQ chip representing your controller can't be a
dummy_irq_chip, that has no methods so no masking is implemented
through it and the flow handler must be handle_level_irq (which,
in turn takes care of masking the IRQ - handle_simple_irq does
not).
The IRQ chip in the PCI host bridge has to have a way to mask/unmask
specific IRQs, implement a proper IRQ chip for it please.
We are curious: Have you ever tested this change with a PCI driver
requesting a threaded IRQ ?
Thanks,
Lorenzo
> + irq_set_chip_data(irq, domain->host_data);
> +
> + return 0;
> +}
> +
> +static const struct irq_domain_ops intx_domain_ops = {
> + .map = iproc_pcie_intx_map,
> +};
> +
> +static void iproc_pcie_isr(struct irq_desc *desc)
> +{
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + struct iproc_pcie *pcie;
> + struct device *dev;
> + unsigned long status;
> + u32 bit, virq;
> +
> + chained_irq_enter(chip, desc);
> + pcie = irq_desc_get_handler_data(desc);
> + dev = pcie->dev;
> +
> + /* go through INTx A, B, C, D until all interrupts are handled */
> + do {
> + status = iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_CSR);
> + for_each_set_bit(bit, &status, PCI_NUM_INTX) {
> + virq = irq_find_mapping(pcie->irq_domain, bit);
> + if (virq)
> + generic_handle_irq(virq);
> + else
> + dev_err(dev, "unexpected INTx%u\n", bit);
> + }
> + } while ((status & SYS_RC_INTX_MASK) != 0);
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +static int iproc_pcie_intx_enable(struct iproc_pcie *pcie)
> +{
> + struct device *dev = pcie->dev;
> + struct device_node *node;
> + int ret;
> +
> + /*
> + * BCMA devices do not map INTx the same way as platform devices. All
> + * BCMA needs below line to enable INTx
> + */
> iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK);
> +
> + node = of_get_compatible_child(dev->of_node, "brcm,iproc-intc");
> + if (node)
> + pcie->irq = of_irq_get(node, 0);
> +
> + if (!node || pcie->irq <= 0)
> + return 0;
> +
> + /* set IRQ handler */
> + irq_set_chained_handler_and_data(pcie->irq, iproc_pcie_isr, pcie);
> +
> + /* add IRQ domain for INTx */
> + pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
> + &intx_domain_ops, pcie);
> + if (!pcie->irq_domain) {
> + dev_err(dev, "failed to add INTx IRQ domain\n");
> + ret = -ENOMEM;
> + goto err_rm_handler_data;
> + }
> +
> + return 0;
> +
> +err_rm_handler_data:
> + of_node_put(node);
> + irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
> +
> + return ret;
> +}
> +
> +static void iproc_pcie_intx_disable(struct iproc_pcie *pcie)
> +{
> + uint32_t offset, virq;
> +
> + iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, 0x0);
> +
> + if (pcie->irq <= 0)
> + return;
> +
> + for (offset = 0; offset < PCI_NUM_INTX; offset++) {
> + virq = irq_find_mapping(pcie->irq_domain, offset);
> + if (virq)
> + irq_dispose_mapping(virq);
> + }
> +
> + irq_domain_remove(pcie->irq_domain);
> + irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
> }
>
> static inline bool iproc_pcie_ob_is_valid(struct iproc_pcie *pcie,
> @@ -1518,7 +1617,11 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
> goto err_power_off_phy;
> }
>
> - iproc_pcie_enable(pcie);
> + ret = iproc_pcie_intx_enable(pcie);
> + if (ret) {
> + dev_err(dev, "failed to enable INTx\n");
> + goto err_power_off_phy;
> + }
>
> if (IS_ENABLED(CONFIG_PCI_MSI))
> if (iproc_pcie_msi_enable(pcie))
> @@ -1562,6 +1665,7 @@ int iproc_pcie_remove(struct iproc_pcie *pcie)
> pci_remove_root_bus(pcie->root_bus);
>
> iproc_pcie_msi_disable(pcie);
> + iproc_pcie_intx_disable(pcie);
>
> phy_power_off(pcie->phy);
> phy_exit(pcie->phy);
> diff --git a/drivers/pci/controller/pcie-iproc.h b/drivers/pci/controller/pcie-iproc.h
> index 4f03ea5..103e568 100644
> --- a/drivers/pci/controller/pcie-iproc.h
> +++ b/drivers/pci/controller/pcie-iproc.h
> @@ -74,6 +74,9 @@ struct iproc_msi;
> * @ib: inbound mapping related parameters
> * @ib_map: outbound mapping region related parameters
> *
> + * @irq: interrupt line wired to the generic GIC for INTx
> + * @irq_domain: IRQ domain for INTx
> + *
> * @need_msi_steer: indicates additional configuration of the iProc PCIe
> * controller is required to steer MSI writes to external interrupt controller
> * @msi: MSI data
> @@ -102,6 +105,9 @@ struct iproc_pcie {
> struct iproc_pcie_ib ib;
> const struct iproc_pcie_ib_map *ib_map;
>
> + int irq;
> + struct irq_domain *irq_domain;
> +
> bool need_msi_steer;
> struct iproc_msi *msi;
> };
> --
> 2.7.4
>
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