diff options
Diffstat (limited to 'nixos/modules/kernel-patches/0010-PCI-mvebu-Implement-support-for-interrupts-on-emulat.patch')
| -rw-r--r-- | nixos/modules/kernel-patches/0010-PCI-mvebu-Implement-support-for-interrupts-on-emulat.patch | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/nixos/modules/kernel-patches/0010-PCI-mvebu-Implement-support-for-interrupts-on-emulat.patch b/nixos/modules/kernel-patches/0010-PCI-mvebu-Implement-support-for-interrupts-on-emulat.patch new file mode 100644 index 0000000..73ead93 --- /dev/null +++ b/nixos/modules/kernel-patches/0010-PCI-mvebu-Implement-support-for-interrupts-on-emulat.patch @@ -0,0 +1,437 @@ +From 1f840ec09a1bd8925decbc4917d701f6b93483b8 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org> +Date: Fri, 17 Sep 2021 14:40:17 +0200 +Subject: [PATCH 10/96] PCI: mvebu: Implement support for interrupts on + emulated bridge +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This adds support for PME and ERR interrupts reported by emulated bridge +(for PME and AER kernel drivers) via new Root Port irq chip as these +interrupts from PCIe Root Ports are handled by mvebu hardware completely +separately from INTx and MSI interrupts send by real PCIe devices. + +With this change, kernel PME and AER drivers start working as they can +acquire required interrupt lines (provided by mvebu rp virtual irq chip). + +Note that for this support, device tree files has to be properly adjusted +to provide "interrupts" or "interrupts-extended" property with error +interrupt source and "interrupt-names" property with "error" string. + +If device tree files do not provide these properties then driver would work +as before and would not provide interrupts on emulated bridge, like before. + +Signed-off-by: Pali Rohár <pali@kernel.org> +--- + drivers/pci/controller/pci-mvebu.c | 256 ++++++++++++++++++++++++++--- + 1 file changed, 237 insertions(+), 19 deletions(-) + +diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c +index cacc78863915..56924b0a1969 100644 +--- a/drivers/pci/controller/pci-mvebu.c ++++ b/drivers/pci/controller/pci-mvebu.c +@@ -56,8 +56,16 @@ + #define PCIE_CONF_DATA_OFF 0x18fc + #define PCIE_INT_CAUSE_OFF 0x1900 + #define PCIE_INT_UNMASK_OFF 0x1910 ++#define PCIE_INT_DET_COR BIT(8) ++#define PCIE_INT_DET_NONFATAL BIT(9) ++#define PCIE_INT_DET_FATAL BIT(10) ++#define PCIE_INT_ERR_FATAL BIT(16) ++#define PCIE_INT_ERR_NONFATAL BIT(17) ++#define PCIE_INT_ERR_COR BIT(18) + #define PCIE_INT_INTX(i) BIT(24+i) + #define PCIE_INT_PM_PME BIT(28) ++#define PCIE_INT_DET_MASK (PCIE_INT_DET_COR | PCIE_INT_DET_NONFATAL | PCIE_INT_DET_FATAL) ++#define PCIE_INT_ERR_MASK (PCIE_INT_ERR_FATAL | PCIE_INT_ERR_NONFATAL | PCIE_INT_ERR_COR) + #define PCIE_INT_ALL_MASK GENMASK(31, 0) + #define PCIE_CTRL_OFF 0x1a00 + #define PCIE_CTRL_X1_MODE 0x0001 +@@ -120,9 +128,12 @@ struct mvebu_pcie_port { + struct resource regs; + u8 slot_power_limit_value; + u8 slot_power_limit_scale; ++ struct irq_domain *rp_irq_domain; + struct irq_domain *intx_irq_domain; + raw_spinlock_t irq_lock; ++ int error_irq; + int intx_irq; ++ bool pme_pending; + }; + + static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg) +@@ -321,9 +332,19 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port) + /* Clear all interrupt causes. */ + mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_CAUSE_OFF); + +- /* Check if "intx" interrupt was specified in DT. */ +- if (port->intx_irq > 0) +- return; ++ /* ++ * Unmask all error interrupts which are internally generated. ++ * They cannot be disabled by SERR# Enable bit in PCI Command register, ++ * see Figure 6-3: Pseudo Logic Diagram for Error Message Controls in ++ * PCIe base specification. ++ * Internally generated mvebu interrupts are reported via mvebu summary ++ * interrupt which requires "error" interrupt to be specified in DT. ++ */ ++ if (port->error_irq > 0) { ++ unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); ++ unmask |= PCIE_INT_DET_MASK; ++ mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); ++ } + + /* + * Fallback code when "intx" interrupt was not specified in DT: +@@ -335,10 +356,12 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port) + * performance penalty as every PCIe interrupt handler needs to be + * called when some interrupt is triggered. + */ +- unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); +- unmask |= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | +- PCIE_INT_INTX(2) | PCIE_INT_INTX(3); +- mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); ++ if (port->intx_irq <= 0) { ++ unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); ++ unmask |= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | ++ PCIE_INT_INTX(2) | PCIE_INT_INTX(3); ++ mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); ++ } + } + + static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie, +@@ -598,11 +621,16 @@ mvebu_pci_bridge_emul_base_conf_read(struct pci_bridge_emul *bridge, + case PCI_INTERRUPT_LINE: { + /* + * From the whole 32bit register we support reading from HW only +- * one bit: PCI_BRIDGE_CTL_BUS_RESET. ++ * two bits: PCI_BRIDGE_CTL_BUS_RESET and PCI_BRIDGE_CTL_SERR. + * Other bits are retrieved only from emulated config buffer. + */ + __le32 *cfgspace = (__le32 *)&bridge->conf; + u32 val = le32_to_cpu(cfgspace[PCI_INTERRUPT_LINE / 4]); ++ if ((mvebu_readl(port, PCIE_INT_UNMASK_OFF) & ++ PCIE_INT_ERR_MASK) == PCIE_INT_ERR_MASK) ++ val |= PCI_BRIDGE_CTL_SERR << 16; ++ else ++ val &= ~(PCI_BRIDGE_CTL_SERR << 16); + if (mvebu_readl(port, PCIE_CTRL_OFF) & PCIE_CTRL_MASTER_HOT_RESET) + val |= PCI_BRIDGE_CTL_BUS_RESET << 16; + else +@@ -670,6 +698,11 @@ mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge, + break; + } + ++ case PCI_EXP_RTCTL: ++ *value = (mvebu_readl(port, PCIE_INT_UNMASK_OFF) & ++ PCIE_INT_PM_PME) ? PCI_EXP_RTCTL_PMEIE : 0; ++ break; ++ + case PCI_EXP_RTSTA: + *value = mvebu_readl(port, PCIE_RC_RTSTA); + break; +@@ -775,6 +808,14 @@ mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge, + break; + + case PCI_INTERRUPT_LINE: ++ if ((mask & (PCI_BRIDGE_CTL_SERR << 16)) && port->error_irq > 0) { ++ u32 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); ++ if (new & (PCI_BRIDGE_CTL_SERR << 16)) ++ unmask |= PCIE_INT_ERR_MASK; ++ else ++ unmask &= ~PCIE_INT_ERR_MASK; ++ mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); ++ } + if (mask & (PCI_BRIDGE_CTL_BUS_RESET << 16)) { + u32 ctrl = mvebu_readl(port, PCIE_CTRL_OFF); + if (new & (PCI_BRIDGE_CTL_BUS_RESET << 16)) +@@ -833,10 +874,25 @@ mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge, + * PME Status bit in Root Status Register (PCIE_RC_RTSTA) + * is read-only and can be cleared only by writing 0b to the + * Interrupt Cause RW0C register (PCIE_INT_CAUSE_OFF). So +- * clear PME via Interrupt Cause. ++ * clear PME via Interrupt Cause and also set port->pme_pending ++ * variable to false value to start processing PME interrupts ++ * in interrupt handler again. + */ +- if (new & PCI_EXP_RTSTA_PME) ++ if (new & PCI_EXP_RTSTA_PME) { + mvebu_writel(port, ~PCIE_INT_PM_PME, PCIE_INT_CAUSE_OFF); ++ port->pme_pending = false; ++ } ++ break; ++ ++ case PCI_EXP_RTCTL: ++ if ((mask & PCI_EXP_RTCTL_PMEIE) && port->error_irq > 0) { ++ u32 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); ++ if (new & PCI_EXP_RTCTL_PMEIE) ++ unmask |= PCIE_INT_PM_PME; ++ else ++ unmask &= ~PCIE_INT_PM_PME; ++ mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); ++ } + break; + + case PCI_EXP_DEVCTL2: +@@ -919,6 +975,14 @@ static int mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port) + bridge_flags |= PCI_BRIDGE_EMUL_NO_IO_FORWARD; + } + ++ /* ++ * Interrupts on emulated bridge are supported only when "error" ++ * interrupt was specified in DT. Without it emulated bridge cannot ++ * emulate interrupts. ++ */ ++ if (port->error_irq > 0) ++ bridge->conf.intpin = PCI_INTERRUPT_INTA; ++ + /* + * Older mvebu hardware provides PCIe Capability structure only in + * version 1. New hardware provides it in version 2. +@@ -1065,6 +1129,26 @@ static const struct irq_domain_ops mvebu_pcie_intx_irq_domain_ops = { + .xlate = irq_domain_xlate_onecell, + }; + ++static struct irq_chip rp_irq_chip = { ++ .name = "mvebu-rp", ++}; ++ ++static int mvebu_pcie_rp_irq_map(struct irq_domain *h, ++ unsigned int virq, irq_hw_number_t hwirq) ++{ ++ struct mvebu_pcie_port *port = h->host_data; ++ ++ irq_set_chip_and_handler(virq, &rp_irq_chip, handle_simple_irq); ++ irq_set_chip_data(virq, port); ++ ++ return 0; ++} ++ ++static const struct irq_domain_ops mvebu_pcie_rp_irq_domain_ops = { ++ .map = mvebu_pcie_rp_irq_map, ++ .xlate = irq_domain_xlate_onecell, ++}; ++ + static int mvebu_pcie_init_irq_domain(struct mvebu_pcie_port *port) + { + struct device *dev = &port->pcie->pdev->dev; +@@ -1087,10 +1171,72 @@ static int mvebu_pcie_init_irq_domain(struct mvebu_pcie_port *port) + return -ENOMEM; + } + ++ /* ++ * When "error" interrupt was not specified in DT then there is no ++ * support for interrupts on emulated root bridge. So skip following ++ * initialization. ++ */ ++ if (port->error_irq <= 0) ++ return 0; ++ ++ port->rp_irq_domain = irq_domain_add_linear(NULL, 1, ++ &mvebu_pcie_rp_irq_domain_ops, ++ port); ++ if (!port->rp_irq_domain) { ++ irq_domain_remove(port->intx_irq_domain); ++ dev_err(dev, "Failed to add Root Port IRQ domain for %s\n", port->name); ++ return -ENOMEM; ++ } ++ + return 0; + } + +-static irqreturn_t mvebu_pcie_irq_handler(int irq, void *arg) ++static irqreturn_t mvebu_pcie_error_irq_handler(int irq, void *arg) ++{ ++ struct mvebu_pcie_port *port = arg; ++ struct device *dev = &port->pcie->pdev->dev; ++ u32 cause, unmask, status; ++ ++ cause = mvebu_readl(port, PCIE_INT_CAUSE_OFF); ++ unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); ++ status = cause & unmask; ++ ++ /* "error" interrupt handler does not process INTX interrupts */ ++ status &= ~(PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | ++ PCIE_INT_INTX(2) | PCIE_INT_INTX(3)); ++ ++ /* Process PME interrupt */ ++ if ((status & PCIE_INT_PM_PME) && !port->pme_pending) { ++ /* ++ * Do not clear PME interrupt bit in Cause Register as it ++ * invalidates also content of Root Status Register. Instead ++ * set port->pme_pending variable to true to indicate that ++ * next time PME interrupt should be ignored until variable ++ * is back to the false value. ++ */ ++ port->pme_pending = true; ++ if (generic_handle_domain_irq(port->rp_irq_domain, 0) == -EINVAL) ++ dev_err_ratelimited(dev, "unhandled PME IRQ\n"); ++ } ++ ++ /* Process ERR interrupt */ ++ if (status & PCIE_INT_ERR_MASK) { ++ mvebu_writel(port, ~PCIE_INT_ERR_MASK, PCIE_INT_CAUSE_OFF); ++ if (generic_handle_domain_irq(port->rp_irq_domain, 0) == -EINVAL) ++ dev_err_ratelimited(dev, "unhandled ERR IRQ\n"); ++ } ++ ++ /* Process local ERR interrupt */ ++ if (status & PCIE_INT_DET_MASK) { ++ mvebu_writel(port, ~PCIE_INT_DET_MASK, PCIE_INT_CAUSE_OFF); ++ if (generic_handle_domain_irq(port->rp_irq_domain, 0) == -EINVAL) ++ dev_err_ratelimited(dev, "unhandled ERR IRQ\n"); ++ } ++ ++ return status ? IRQ_HANDLED : IRQ_NONE; ++} ++ ++static irqreturn_t mvebu_pcie_intx_irq_handler(int irq, void *arg) + { + struct mvebu_pcie_port *port = arg; + struct device *dev = &port->pcie->pdev->dev; +@@ -1101,6 +1247,10 @@ static irqreturn_t mvebu_pcie_irq_handler(int irq, void *arg) + unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); + status = cause & unmask; + ++ /* "intx" interrupt handler process only INTX interrupts */ ++ status &= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | ++ PCIE_INT_INTX(2) | PCIE_INT_INTX(3); ++ + /* Process legacy INTx interrupts */ + for (i = 0; i < PCI_NUM_INTX; i++) { + if (!(status & PCIE_INT_INTX(i))) +@@ -1115,9 +1265,29 @@ static irqreturn_t mvebu_pcie_irq_handler(int irq, void *arg) + + static int mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) + { +- /* Interrupt support on mvebu emulated bridges is not implemented yet */ +- if (dev->bus->number == 0) +- return 0; /* Proper return code 0 == NO_IRQ */ ++ struct mvebu_pcie_port *port; ++ struct mvebu_pcie *pcie; ++ ++ if (dev->bus->number == 0) { ++ /* ++ * Each emulated root bridge for every mvebu port has its own ++ * Root Port irq chip and irq domain. Argument pin is the INTx ++ * pin (1=INTA, 2=INTB, 3=INTC, 4=INTD) and hwirq for function ++ * irq_create_mapping() is indexed from zero. ++ */ ++ pcie = dev->bus->sysdata; ++ port = mvebu_pcie_find_port(pcie, dev->bus, PCI_DEVFN(slot, 0)); ++ if (!port) ++ return 0; /* Proper return code 0 == NO_IRQ */ ++ /* ++ * port->rp_irq_domain is available only when "error" interrupt ++ * was specified in DT. When is not available then interrupts ++ * for emulated root bridge are not provided. ++ */ ++ if (port->error_irq <= 0) ++ return 0; /* Proper return code 0 == NO_IRQ */ ++ return irq_create_mapping(port->rp_irq_domain, pin - 1); ++ } + + return of_irq_parse_and_map_pci(dev, slot, pin); + } +@@ -1326,6 +1496,21 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie, + port->name, child); + } + ++ /* ++ * Old DT bindings do not contain "error" interrupt ++ * so do not fail probing driver when interrupt does not exist. ++ */ ++ port->error_irq = of_irq_get_byname(child, "error"); ++ if (port->error_irq == -EPROBE_DEFER) { ++ ret = port->error_irq; ++ goto err; ++ } ++ if (port->error_irq <= 0) { ++ dev_warn(dev, "%s: interrupts on Root Port are unsupported, " ++ "%pOF does not contain error interrupt\n", ++ port->name, child); ++ } ++ + reset_gpio = of_get_named_gpio_flags(child, "reset-gpios", 0, &flags); + if (reset_gpio == -EPROBE_DEFER) { + ret = reset_gpio; +@@ -1531,7 +1716,6 @@ static int mvebu_pcie_probe(struct platform_device *pdev) + + for (i = 0; i < pcie->nports; i++) { + struct mvebu_pcie_port *port = &pcie->ports[i]; +- int irq = port->intx_irq; + + child = port->dn; + if (!child) +@@ -1559,7 +1743,7 @@ static int mvebu_pcie_probe(struct platform_device *pdev) + continue; + } + +- if (irq > 0) { ++ if (port->error_irq > 0 || port->intx_irq > 0) { + ret = mvebu_pcie_init_irq_domain(port); + if (ret) { + dev_err(dev, "%s: cannot init irq domain\n", +@@ -1570,14 +1754,42 @@ static int mvebu_pcie_probe(struct platform_device *pdev) + mvebu_pcie_powerdown(port); + continue; + } ++ } ++ ++ if (port->error_irq > 0) { ++ ret = devm_request_irq(dev, port->error_irq, ++ mvebu_pcie_error_irq_handler, ++ IRQF_SHARED | IRQF_NO_THREAD, ++ port->name, port); ++ if (ret) { ++ dev_err(dev, "%s: cannot register error interrupt handler: %d\n", ++ port->name, ret); ++ if (port->intx_irq_domain) ++ irq_domain_remove(port->intx_irq_domain); ++ if (port->rp_irq_domain) ++ irq_domain_remove(port->rp_irq_domain); ++ pci_bridge_emul_cleanup(&port->bridge); ++ devm_iounmap(dev, port->base); ++ port->base = NULL; ++ mvebu_pcie_powerdown(port); ++ continue; ++ } ++ } + +- ret = devm_request_irq(dev, irq, mvebu_pcie_irq_handler, ++ if (port->intx_irq > 0) { ++ ret = devm_request_irq(dev, port->intx_irq, ++ mvebu_pcie_intx_irq_handler, + IRQF_SHARED | IRQF_NO_THREAD, + port->name, port); + if (ret) { +- dev_err(dev, "%s: cannot register interrupt handler: %d\n", ++ dev_err(dev, "%s: cannot register intx interrupt handler: %d\n", + port->name, ret); +- irq_domain_remove(port->intx_irq_domain); ++ if (port->error_irq > 0) ++ devm_free_irq(dev, port->error_irq, port); ++ if (port->intx_irq_domain) ++ irq_domain_remove(port->intx_irq_domain); ++ if (port->rp_irq_domain) ++ irq_domain_remove(port->rp_irq_domain); + pci_bridge_emul_cleanup(&port->bridge); + devm_iounmap(dev, port->base); + port->base = NULL; +@@ -1715,6 +1927,12 @@ static int mvebu_pcie_remove(struct platform_device *pdev) + } + irq_domain_remove(port->intx_irq_domain); + } ++ if (port->rp_irq_domain) { ++ int virq = irq_find_mapping(port->rp_irq_domain, 0); ++ if (virq > 0) ++ irq_dispose_mapping(virq); ++ irq_domain_remove(port->rp_irq_domain); ++ } + + /* Free config space for emulated root bridge. */ + pci_bridge_emul_cleanup(&port->bridge); +-- +2.37.2 + |