diff options
| -rw-r--r-- | drivers/pci/controller/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/pci/controller/pci-host-common.c | 1 | ||||
| -rw-r--r-- | drivers/pci/controller/pci-hyperv.c | 4 | ||||
| -rw-r--r-- | drivers/pci/controller/pci-tegra.c | 349 | ||||
| -rw-r--r-- | drivers/pci/controller/pcie-mediatek.c | 4 | ||||
| -rw-r--r-- | drivers/pci/controller/pcie-rcar-host.c | 355 | ||||
| -rw-r--r-- | drivers/pci/controller/pcie-xilinx.c | 246 | ||||
| -rw-r--r-- | drivers/pci/msi.c | 45 | ||||
| -rw-r--r-- | drivers/pci/probe.c | 4 | ||||
| -rw-r--r-- | drivers/pci/quirks.c | 15 | ||||
| -rw-r--r-- | include/linux/msi.h | 17 | ||||
| -rw-r--r-- | include/linux/pci.h | 3 |
12 files changed, 489 insertions, 558 deletions
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 1e925ac47279..2f2c8a1729f9 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -41,7 +41,6 @@ config PCI_TEGRA bool "NVIDIA Tegra PCIe controller" depends on ARCH_TEGRA || COMPILE_TEST depends on PCI_MSI_IRQ_DOMAIN - select PCI_MSI_ARCH_FALLBACKS help Say Y here if you want support for the PCIe host controller found on NVIDIA Tegra SoCs. @@ -59,7 +58,6 @@ config PCIE_RCAR_HOST bool "Renesas R-Car PCIe host controller" depends on ARCH_RENESAS || COMPILE_TEST depends on PCI_MSI_IRQ_DOMAIN - select PCI_MSI_ARCH_FALLBACKS help Say Y here if you want PCIe controller support on R-Car SoCs in host mode. @@ -88,7 +86,7 @@ config PCI_HOST_GENERIC config PCIE_XILINX bool "Xilinx AXI PCIe host bridge support" depends on OF || COMPILE_TEST - select PCI_MSI_ARCH_FALLBACKS + depends on PCI_MSI_IRQ_DOMAIN help Say 'Y' here if you want kernel to support the Xilinx AXI PCIe Host Bridge driver. diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c index 6ab694f8d283..d3924a44db02 100644 --- a/drivers/pci/controller/pci-host-common.c +++ b/drivers/pci/controller/pci-host-common.c @@ -79,6 +79,7 @@ int pci_host_common_probe(struct platform_device *pdev) bridge->sysdata = cfg; bridge->ops = (struct pci_ops *)&ops->pci_ops; + bridge->msi_domain = true; return pci_host_probe(bridge); } diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 27a17a1e4a7c..2c014ba7ed4b 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -473,7 +473,6 @@ struct hv_pcibus_device { struct list_head dr_list; struct msi_domain_info msi_info; - struct msi_controller msi_chip; struct irq_domain *irq_domain; spinlock_t retarget_msi_interrupt_lock; @@ -1866,9 +1865,6 @@ static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus) if (!hbus->pci_bus) return -ENODEV; - hbus->pci_bus->msi = &hbus->msi_chip; - hbus->pci_bus->msi->dev = &hbus->hdev->device; - pci_lock_rescan_remove(); pci_scan_child_bus(hbus->pci_bus); hv_pci_assign_numa_node(hbus); diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c index 8fcabed7c6a6..8069bd9232d4 100644 --- a/drivers/pci/controller/pci-tegra.c +++ b/drivers/pci/controller/pci-tegra.c @@ -21,6 +21,7 @@ #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/irq.h> +#include <linux/irqchip/chained_irq.h> #include <linux/irqdomain.h> #include <linux/kernel.h> #include <linux/init.h> @@ -78,23 +79,8 @@ #define AFI_MSI_FPCI_BAR_ST 0x64 #define AFI_MSI_AXI_BAR_ST 0x68 -#define AFI_MSI_VEC0 0x6c -#define AFI_MSI_VEC1 0x70 -#define AFI_MSI_VEC2 0x74 -#define AFI_MSI_VEC3 0x78 -#define AFI_MSI_VEC4 0x7c -#define AFI_MSI_VEC5 0x80 -#define AFI_MSI_VEC6 0x84 -#define AFI_MSI_VEC7 0x88 - -#define AFI_MSI_EN_VEC0 0x8c -#define AFI_MSI_EN_VEC1 0x90 -#define AFI_MSI_EN_VEC2 0x94 -#define AFI_MSI_EN_VEC3 0x98 -#define AFI_MSI_EN_VEC4 0x9c -#define AFI_MSI_EN_VEC5 0xa0 -#define AFI_MSI_EN_VEC6 0xa4 -#define AFI_MSI_EN_VEC7 0xa8 +#define AFI_MSI_VEC(x) (0x6c + ((x) * 4)) +#define AFI_MSI_EN_VEC(x) (0x8c + ((x) * 4)) #define AFI_CONFIGURATION 0xac #define AFI_CONFIGURATION_EN_FPCI (1 << 0) @@ -280,10 +266,10 @@ #define LINK_RETRAIN_TIMEOUT 100000 /* in usec */ struct tegra_msi { - struct msi_controller chip; DECLARE_BITMAP(used, INT_PCI_MSI_NR); struct irq_domain *domain; - struct mutex lock; + struct mutex map_lock; + spinlock_t mask_lock; void *virt; dma_addr_t phys; int irq; @@ -333,11 +319,6 @@ struct tegra_pcie_soc { } ectl; }; -static inline struct tegra_msi *to_tegra_msi(struct msi_controller *chip) -{ - return container_of(chip, struct tegra_msi, chip); -} - struct tegra_pcie { struct device *dev; @@ -372,6 +353,11 @@ struct tegra_pcie { struct dentry *debugfs; }; +static inline struct tegra_pcie *msi_to_pcie(struct tegra_msi *msi) +{ + return container_of(msi, struct tegra_pcie, msi); +} + struct tegra_pcie_port { struct tegra_pcie *pcie; struct device_node *np; @@ -1432,7 +1418,6 @@ static void tegra_pcie_phys_put(struct tegra_pcie *pcie) } } - static int tegra_pcie_get_resources(struct tegra_pcie *pcie) { struct device *dev = pcie->dev; @@ -1509,6 +1494,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) phys_put: if (soc->program_uphy) tegra_pcie_phys_put(pcie); + return err; } @@ -1551,161 +1537,227 @@ static void tegra_pcie_pme_turnoff(struct tegra_pcie_port *port) afi_writel(pcie, val, AFI_PCIE_PME); } -static int tegra_msi_alloc(struct tegra_msi *chip) -{ - int msi; - - mutex_lock(&chip->lock); - - msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR); - if (msi < INT_PCI_MSI_NR) - set_bit(msi, chip->used); - else - msi = -ENOSPC; - - mutex_unlock(&chip->lock); - - return msi; -} - -static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq) +static void tegra_pcie_msi_irq(struct irq_desc *desc) { - struct device *dev = chip->chip.dev; - - mutex_lock(&chip->lock); - - if (!test_bit(irq, chip->used)) - dev_err(dev, "trying to free unused MSI#%lu\n", irq); - else - clear_bit(irq, chip->used); - - mutex_unlock(&chip->lock); -} - -static irqreturn_t tegra_pcie_msi_irq(int irq, void *data) -{ - struct tegra_pcie *pcie = data; - struct device *dev = pcie->dev; + struct tegra_pcie *pcie = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); struct tegra_msi *msi = &pcie->msi; - unsigned int i, processed = 0; + struct device *dev = pcie->dev; + unsigned int i; + + chained_irq_enter(chip, desc); for (i = 0; i < 8; i++) { - unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4); + unsigned long reg = afi_readl(pcie, AFI_MSI_VEC(i)); while (reg) { unsigned int offset = find_first_bit(®, 32); unsigned int index = i * 32 + offset; unsigned int irq; - /* clear the interrupt */ - afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4); - - irq = irq_find_mapping(msi->domain, index); + irq = irq_find_mapping(msi->domain->parent, index); if (irq) { - if (test_bit(index, msi->used)) - generic_handle_irq(irq); - else - dev_info(dev, "unhandled MSI\n"); + generic_handle_irq(irq); } else { /* * that's weird who triggered this? * just clear it */ dev_info(dev, "unexpected MSI\n"); + afi_writel(pcie, BIT(index % 32), AFI_MSI_VEC(index)); } /* see if there's any more pending in this vector */ - reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4); - - processed++; + reg = afi_readl(pcie, AFI_MSI_VEC(i)); } } - return processed > 0 ? IRQ_HANDLED : IRQ_NONE; + chained_irq_exit(chip, desc); } -static int tegra_msi_setup_irq(struct msi_controller *chip, - struct pci_dev *pdev, struct msi_desc *desc) +static void tegra_msi_top_irq_ack(struct irq_data *d) { - struct tegra_msi *msi = to_tegra_msi(chip); - struct msi_msg msg; - unsigned int irq; - int hwirq; + irq_chip_ack_parent(d); +} - hwirq = tegra_msi_alloc(msi); - if (hwirq < 0) - return hwirq; +static void tegra_msi_top_irq_mask(struct irq_data *d) +{ + pci_msi_mask_irq(d); + irq_chip_mask_parent(d); +} - irq = irq_create_mapping(msi->domain, hwirq); - if (!irq) { - tegra_msi_free(msi, hwirq); - return -EINVAL; - } +static void tegra_msi_top_irq_unmask(struct irq_data *d) +{ + pci_msi_unmask_irq(d); + irq_chip_unmask_parent(d); +} + +static struct irq_chip tegra_msi_top_chip = { + .name = "Tegra PCIe MSI", + .irq_ack = tegra_msi_top_irq_ack, + .irq_mask = tegra_msi_top_irq_mask, + .irq_unmask = tegra_msi_top_irq_unmask, +}; - irq_set_msi_desc(irq, desc); +static void tegra_msi_irq_ack(struct irq_data *d) +{ + struct tegra_msi *msi = irq_data_get_irq_chip_data(d); + struct tegra_pcie *pcie = msi_to_pcie(msi); + unsigned int index = d->hwirq / 32; - msg.address_lo = lower_32_bits(msi->phys); - msg.address_hi = upper_32_bits(msi->phys); - msg.data = hwirq; + /* clear the interrupt */ + afi_writel(pcie, BIT(d->hwirq % 32), AFI_MSI_VEC(index)); +} - pci_write_msi_msg(irq, &msg); +static void tegra_msi_irq_mask(struct irq_data *d) +{ + struct tegra_msi *msi = irq_data_get_irq_chip_data(d); + struct tegra_pcie *pcie = msi_to_pcie(msi); + unsigned int index = d->hwirq / 32; + unsigned long flags; + u32 value; - return 0; + spin_lock_irqsave(&msi->mask_lock, flags); + value = afi_readl(pcie, AFI_MSI_EN_VEC(index)); + value &= ~BIT(d->hwirq % 32); + afi_writel(pcie, value, AFI_MSI_EN_VEC(index)); + spin_unlock_irqrestore(&msi->mask_lock, flags); } -static void tegra_msi_teardown_irq(struct msi_controller *chip, - unsigned int irq) +static void tegra_msi_irq_unmask(struct irq_data *d) { - struct tegra_msi *msi = to_tegra_msi(chip); - struct irq_data *d = irq_get_irq_data(irq); - irq_hw_number_t hwirq = irqd_to_hwirq(d); + struct tegra_msi *msi = irq_data_get_irq_chip_data(d); + struct tegra_pcie *pcie = msi_to_pcie(msi); + unsigned int index = d->hwirq / 32; + unsigned long flags; + u32 value; - irq_dispose_mapping(irq); - tegra_msi_free(msi, hwirq); + spin_lock_irqsave(&msi->mask_lock, flags); + value = afi_readl(pcie, AFI_MSI_EN_VEC(index)); + value |= BIT(d->hwirq % 32); + afi_writel(pcie, value, AFI_MSI_EN_VEC(index)); + spin_unlock_irqrestore(&msi->mask_lock, flags); } -static struct irq_chip tegra_msi_irq_chip = { - .name = "Tegra PCIe MSI", - .irq_enable = pci_msi_unmask_irq, - .irq_disable = pci_msi_mask_irq, - .irq_mask = pci_msi_mask_irq, - .irq_unmask = pci_msi_unmask_irq, +static int tegra_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force) +{ + return -EINVAL; +} + +static void tegra_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct tegra_msi *msi = irq_data_get_irq_chip_data(data); + + msg->address_lo = lower_32_bits(msi->phys); + msg->address_hi = upper_32_bits(msi->phys); + msg->data = data->hwirq; +} + +static struct irq_chip tegra_msi_bottom_chip = { + .name = "Tegra MSI", + .irq_ack = tegra_msi_irq_ack, + .irq_mask = tegra_msi_irq_mask, + .irq_unmask = tegra_msi_irq_unmask, + .irq_set_affinity = tegra_msi_set_affinity, + .irq_compose_msi_msg = tegra_compose_msi_msg, }; -static int tegra_msi_map(struct irq_domain *domain, unsigned int irq, - irq_hw_number_t hwirq) +static int tegra_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *args) { - irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq); - irq_set_chip_data(irq, domain->host_data); + struct tegra_msi *msi = domain->host_data; + unsigned int i; + int hwirq; + + mutex_lock(&msi->map_lock); + + hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs)); + + mutex_unlock(&msi->map_lock); + + if (hwirq < 0) + return -ENOSPC; + + for (i = 0; i < nr_irqs; i++) + irq_domain_set_info(domain, virq + i, hwirq + i, + &tegra_msi_bottom_chip, domain->host_data, + handle_edge_irq, NULL, NULL); tegra_cpuidle_pcie_irqs_in_use(); return 0; } -static const struct irq_domain_ops msi_domain_ops = { - .map = tegra_msi_map, +static void tegra_msi_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *d = irq_domain_get_irq_data(domain, virq); + struct tegra_msi *msi = domain->host_data; + + mutex_lock(&msi->map_lock); + + bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs)); + + mutex_unlock(&msi->map_lock); +} + +static const struct irq_domain_ops tegra_msi_domain_ops = { + .alloc = tegra_msi_domain_alloc, + .free = tegra_msi_domain_free, +}; + +static struct msi_domain_info tegra_msi_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | + MSI_FLAG_PCI_MSIX), + .chip = &tegra_msi_top_chip, }; +static int tegra_allocate_domains(struct tegra_msi *msi) +{ + struct tegra_pcie *pcie = msi_to_pcie(msi); + struct fwnode_handle *fwnode = dev_fwnode(pcie->dev); + struct irq_domain *parent; + + parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR, + &tegra_msi_domain_ops, msi); + if (!parent) { + dev_err(pcie->dev, "failed to create IRQ domain\n"); + return -ENOMEM; + } + irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS); + + msi->domain = pci_msi_create_irq_domain(fwnode, &tegra_msi_info, parent); + if (!msi->domain) { + dev_err(pcie->dev, "failed to create MSI domain\n"); + irq_domain_remove(parent); + return -ENOMEM; + } + + return 0; +} + +static void tegra_free_domains(struct tegra_msi *msi) +{ + struct irq_domain *parent = msi->domain->parent; + + irq_domain_remove(msi->domain); + irq_domain_remove(parent); +} + static int tegra_pcie_msi_setup(struct tegra_pcie *pcie) { - struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); struct platform_device *pdev = to_platform_device(pcie->dev); struct tegra_msi *msi = &pcie->msi; struct device *dev = pcie->dev; int err; - mutex_init(&msi->lock); - - msi->chip.dev = dev; - msi->chip.setup_irq = tegra_msi_setup_irq; - msi->chip.teardown_irq = tegra_msi_teardown_irq; + mutex_init(&msi->map_lock); + spin_lock_init(&msi->mask_lock); - msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR, - &msi_domain_ops, &msi->chip); - if (!msi->domain) { - dev_err(dev, "failed to create IRQ domain\n"); - return -ENOMEM; + if (IS_ENABLED(CONFIG_PCI_MSI)) { + err = tegra_allocate_domains(msi); + if (err) + return err; } err = platform_get_irq_byname(pdev, "msi"); @@ -1714,12 +1766,7 @@ static int tegra_pcie_msi_setup(struct tegra_pcie *pcie) msi->irq = err; - err = request_irq(msi->irq, tegra_pcie_msi_irq, IRQF_NO_THREAD, - tegra_msi_irq_chip.name, pcie); - if (err < 0) { - dev_err(dev, "failed to request IRQ: %d\n", err); - goto free_irq_domain; - } + irq_set_chained_handler_and_data(msi->irq, tegra_pcie_msi_irq, pcie); /* Though the PCIe controller can address >32-bit address space, to * facilitate endpoints that support only 32-bit MSI target address, @@ -1740,14 +1787,14 @@ static int tegra_pcie_msi_setup(struct tegra_pcie *pcie) goto free_irq; } - host->msi = &msi->chip; - return 0; free_irq: - free_irq(msi->irq, pcie); + irq_set_chained_handler_and_data(msi->irq, NULL, NULL); free_irq_domain: - irq_domain_remove(msi->domain); + if (IS_ENABLED(CONFIG_PCI_MSI)) + tegra_free_domains(msi); + return err; } @@ -1755,22 +1802,18 @@ static void tegra_pcie_enable_msi(struct tegra_pcie *pcie) { const struct tegra_pcie_soc *soc = pcie->soc; struct tegra_msi *msi = &pcie->msi; - u32 reg; + u32 reg, msi_state[INT_PCI_MSI_NR / 32]; + int i; afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST); afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST); /* this register is in 4K increments */ afi_writel(pcie, 1, AFI_MSI_BAR_SZ); - /* enable all MSI vectors */ - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0); - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1); - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2); - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3); - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4); - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5); - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6); - afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7); + /* Restore the MSI allocation state */ + bitmap_to_arr32(msi_state, msi->used, INT_PCI_MSI_NR); + for (i = 0; i < ARRAY_SIZE(msi_state); i++) + afi_writel(pcie, msi_state[i], AFI_MSI_EN_VEC(i)); /* and unmask the MSI interrupt */ reg = afi_readl(pcie, AFI_INTR_MASK); @@ -1786,16 +1829,16 @@ static void tegra_pcie_msi_teardown(struct tegra_pcie *pcie) dma_free_attrs(pcie->dev, PAGE_SIZE, msi->virt, msi->phys, DMA_ATTR_NO_KERNEL_MAPPING); - if (msi->irq > 0) - free_irq(msi->irq, pcie); - for (i = 0; i < INT_PCI_MSI_NR; i++) { irq = irq_find_mapping(msi->domain, i); if (irq > 0) - irq_dispose_mapping(irq); + irq_domain_free_irqs(irq, 1); } - irq_domain_remove(msi->domain); + irq_set_chained_handler_and_data(msi->irq, NULL, NULL); + + if (IS_ENABLED(CONFIG_PCI_MSI)) + tegra_free_domains(msi); } static int tegra_pcie_disable_msi(struct tegra_pcie *pcie) @@ -1807,16 +1850,6 @@ static int tegra_pcie_disable_msi(struct tegra_pcie *pcie) value &= ~AFI_INTR_MASK_MSI_MASK; afi_writel(pcie, value, AFI_INTR_MASK); - /* disable all MSI vectors */ - afi_writel(pcie, 0, AFI_MSI_EN_VEC0); - afi_writel(pcie, 0, AFI_MSI_EN_VEC1); - afi_writel(pcie, 0, AFI_MSI_EN_VEC2); - afi_writel(pcie, 0, AFI_MSI_EN_VEC3); - afi_writel(pcie, 0, AFI_MSI_EN_VEC4); - afi_writel(pcie, 0, AFI_MSI_EN_VEC5); - afi_writel(pcie, 0, AFI_MSI_EN_VEC6); - afi_writel(pcie, 0, AFI_MSI_EN_VEC7); - return 0; } diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index ddbd2f8b3226..62a042e75d9a 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -143,6 +143,7 @@ struct mtk_pcie_port; * struct mtk_pcie_soc - differentiate between host generations * @need_fix_class_id: whether this host's class ID needed to be fixed or not * @need_fix_device_id: whether this host's device ID needed to be fixed or not + * @no_msi: Bridge has no MSI support, and relies on an external block * @device_id: device ID which this host need to be fixed * @ops: pointer to configuration access functions * @startup: pointer to controller setting functions @@ -151,6 +152,7 @@ struct mtk_pcie_port; struct mtk_pcie_soc { bool need_fix_class_id; bool need_fix_device_id; + bool no_msi; unsigned int device_id; struct pci_ops *ops; int (*startup)(struct mtk_pcie_port *port); @@ -1087,6 +1089,7 @@ static int mtk_pcie_probe(struct platform_device *pdev) host->ops = pcie->soc->ops; host->sysdata = pcie; + host->msi_domain = pcie->soc->no_msi; err = pci_host_probe(host); if (err) @@ -1176,6 +1179,7 @@ static const struct dev_pm_ops mtk_pcie_pm_ops = { }; static const struct mtk_pcie_soc mtk_pcie_soc_v1 = { + .no_msi = true, .ops = &mtk_pcie_ops, .startup = mtk_pcie_startup_port, }; diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c index a728e8f9ad3c..765cf2b45e24 100644 --- a/drivers/pci/controller/pcie-rcar-host.c +++ b/drivers/pci/controller/pcie-rcar-host.c @@ -35,18 +35,12 @@ struct rcar_msi { DECLARE_BITMAP(used, INT_PCI_MSI_NR); struct irq_domain *domain; - struct msi_controller chip; - unsigned long pages; - struct mutex lock; + struct mutex map_lock; + spinlock_t mask_lock; int irq1; int irq2; }; -static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip) -{ - return container_of(chip, struct rcar_msi, chip); -} - /* Structure representing the PCIe interface */ struct rcar_pcie_host { struct rcar_pcie pcie; @@ -56,6 +50,11 @@ struct rcar_pcie_host { int (*phy_init_fn)(struct rcar_pcie_host *host); }; +static struct rcar_pcie_host *msi_to_host(struct rcar_msi *msi) +{ + return container_of(msi, struct rcar_pcie_host, msi); +} + static u32 rcar_read_conf(struct rcar_pcie *pcie, int where) { unsigned int shift = BITS_PER_BYTE * (where & 3); @@ -292,8 +291,6 @@ static int rcar_pcie_enable(struct rcar_pcie_host *host) bridge->sysdata = host; bridge->ops = &rcar_pcie_ops; - if (IS_ENABLED(CONFIG_PCI_MSI)) - bridge->msi = &host->msi.chip; return pci_host_probe(bridge); } @@ -473,42 +470,6 @@ static int rcar_pcie_phy_init_gen3(struct rcar_pcie_host *host) return err; } -static int rcar_msi_alloc(struct rcar_msi *chip) -{ - int msi; - - mutex_lock(&chip->lock); - - msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR); - if (msi < INT_PCI_MSI_NR) - set_bit(msi, chip->used); - else - msi = -ENOSPC; - - mutex_unlock(&chip->lock); - - return msi; -} - -static int rcar_msi_alloc_region(struct rcar_msi *chip, int no_irqs) -{ - int msi; - - mutex_lock(&chip->lock); - msi = bitmap_find_free_region(chip->used, INT_PCI_MSI_NR, - order_base_2(no_irqs)); - mutex_unlock(&chip->lock); - - return msi; -} - -static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq) -{ - mutex_lock(&chip->lock); - clear_bit(irq, chip->used); - mutex_unlock(&chip->lock); -} - static irqreturn_t rcar_pcie_msi_irq(int irq, void *data) { struct rcar_pcie_host *host = data; @@ -527,18 +488,13 @@ static irqreturn_t rcar_pcie_msi_irq(int irq, void *data) unsigned int index = find_first_bit(®, 32); unsigned int msi_irq; - /* clear the interrupt */ - rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR); - - msi_irq = irq_find_mapping(msi->domain, index); + msi_irq = irq_find_mapping(msi->domain->parent, index); if (msi_irq) { - if (test_bit(index, msi->used)) - generic_handle_irq(msi_irq); - else - dev_info(dev, "unhandled MSI\n"); + generic_handle_irq(msi_irq); } else { /* Unknown MSI, just clear it */ dev_dbg(dev, "unexpected MSI\n"); + rcar_pci_write_reg(pcie, BIT(index), PCIEMSIFR); } /* see if there's any more pending in this vector */ @@ -548,149 +504,169 @@ static irqreturn_t rcar_pcie_msi_irq(int irq, void *data) return IRQ_HANDLED; } -static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev, - struct msi_desc *desc) +static void rcar_msi_top_irq_ack(struct irq_data *d) { - struct rcar_msi *msi = to_rcar_msi(chip); - struct rcar_pcie_host *host = container_of(chip, struct rcar_pcie_host, - msi.chip); - struct rcar_pcie *pcie = &host->pcie; - struct msi_msg msg; - unsigned int irq; - int hwirq; + irq_chip_ack_parent(d); +} - hwirq = rcar_msi_alloc(msi); - if (hwirq < 0) - return hwirq; +static void rcar_msi_top_irq_mask(struct irq_data *d) +{ + pci_msi_mask_irq(d); + irq_chip_mask_parent(d); +} - irq = irq_find_mapping(msi->domain, hwirq); - if (!irq) { - rcar_msi_free(msi, hwirq); - return -EINVAL; - } +static void rcar_msi_top_irq_unmask(struct irq_data *d) +{ + pci_msi_unmask_irq(d); + irq_chip_unmask_parent(d); +} - irq_set_msi_desc(irq, desc); +static struct irq_chip rcar_msi_top_chip = { + .name = "PCIe MSI", + .irq_ack = rcar_msi_top_irq_ack, + .irq_mask = rcar_msi_top_irq_mask, + .irq_unmask = rcar_msi_top_irq_unmask, +}; - msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE; - msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR); - msg.data = hwirq; +static void rcar_msi_irq_ack(struct irq_data *d) +{ + struct rcar_msi *msi = irq_data_get_irq_chip_data(d); + struct rcar_pcie *pcie = &msi_to_host(msi)->pcie; - pci_write_msi_msg(irq, &msg); + /* clear the interrupt */ + rcar_pci_write_reg(pcie, BIT(d->hwirq), PCIEMSIFR); +} - return 0; +static void rcar_msi_irq_mask(struct irq_data *d) +{ + struct rcar_msi *msi = irq_data_get_irq_chip_data(d); + struct rcar_pcie *pcie = &msi_to_host(msi)->pcie; + unsigned long flags; + u32 value; + + spin_lock_irqsave(&msi->mask_lock, flags); + value = rcar_pci_read_reg(pcie, PCIEMSIIER); + value &= ~BIT(d->hwirq); + rcar_pci_write_reg(pcie, value, PCIEMSIIER); + spin_unlock_irqrestore(&msi->mask_lock, flags); } -static int rcar_msi_setup_irqs(struct msi_controller *chip, - struct pci_dev *pdev, int nvec, int type) +static void rcar_msi_irq_unmask(struct irq_data *d) { - struct rcar_msi *msi = to_rcar_msi(chip); - struct rcar_pcie_host *host = container_of(chip, struct rcar_pcie_host, - msi.chip); - struct rcar_pcie *pcie = &host->pcie; - struct msi_desc *desc; - struct msi_msg msg; - unsigned int irq; - int hwirq; - int i; + struct rcar_msi *msi = irq_data_get_irq_chip_data(d); + struct rcar_pcie *pcie = &msi_to_host(msi)->pcie; + unsigned long flags; + u32 value; + + spin_lock_irqsave(&msi->mask_lock, flags); + value = rcar_pci_read_reg(pcie, PCIEMSIIER); + value |= BIT(d->hwirq); + rcar_pci_write_reg(pcie, value, PCIEMSIIER); + spin_unlock_irqrestore(&msi->mask_lock, flags); +} - /* MSI-X interrupts are not supported */ - if (type == PCI_CAP_ID_MSIX) - return -EINVAL; +static int rcar_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force) +{ + return -EINVAL; +} - WARN_ON(!list_is_singular(&pdev->dev.msi_list)); - desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list); +static void rcar_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct rcar_msi *msi = irq_data_get_irq_chip_data(data); + struct rcar_pcie *pcie = &msi_to_host(msi)->pcie; - hwirq = rcar_msi_alloc_region(msi, nvec); - if (hwirq < 0) - return -ENOSPC; + msg->address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE; + msg->address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR); + msg->data = data->hwirq; +} - irq = irq_find_mapping(msi->domain, hwirq); - if (!irq) - return -ENOSPC; +static struct irq_chip rcar_msi_bottom_chip = { + .name = "Rcar MSI", + .irq_ack = rcar_msi_irq_ack, + .irq_mask = rcar_msi_irq_mask, + .irq_unmask = rcar_msi_irq_unmask, + .irq_set_affinity = rcar_msi_set_affinity, + .irq_compose_msi_msg = rcar_compose_msi_msg, +}; - for (i = 0; i < nvec; i++) { - /* - * irq_create_mapping() called from rcar_pcie_probe() pre- - * allocates descs, so there is no need to allocate descs here. - * We can therefore assume that if irq_find_mapping() above - * returns non-zero, then the descs are also successfully - * allocated. - */ - if (irq_set_msi_desc_off(irq, i, desc)) { - /* TODO: clear */ - return -EINVAL; - } - } +static int rcar_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *args) +{ + struct rcar_msi *msi = domain->host_data; + unsigned int i; + int hwirq; - desc->nvec_used = nvec; - desc->msi_attrib.multiple = order_base_2(nvec); + mutex_lock(&msi->map_lock); - msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE; - msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR); - msg.data = hwirq; + hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs)); - pci_write_msi_msg(irq, &msg); + mutex_unlock(&msi->map_lock); + + if (hwirq < 0) + return -ENOSPC; + + for (i = 0; i < nr_irqs; i++) + irq_domain_set_info(domain, virq + i, hwirq + i, + &rcar_msi_bottom_chip, domain->host_data, + handle_edge_irq, NULL, NULL); return 0; } -static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq) +static void rcar_msi_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) { - struct rcar_msi *msi = to_rcar_msi(chip); - struct irq_data *d = irq_get_irq_data(irq); - - rcar_msi_free(msi, d->hwirq); -} + struct irq_data *d = irq_domain_get_irq_data(domain, virq); + struct rcar_msi *msi = domain->host_data; -static struct irq_chip rcar_msi_irq_chip = { - .name = "R-Car PCIe MSI", - .irq_enable = pci_msi_unmask_irq, - .irq_disable = pci_msi_mask_irq, - .irq_mask = pci_msi_mask_irq, - .irq_unmask = pci_msi_unmask_irq, -}; + mutex_lock(&msi->map_lock); -static int rcar_msi_map(struct irq_domain *domain, unsigned int irq, - irq_hw_number_t hwirq) -{ - irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq); - irq_set_chip_data(irq, domain->host_data); + bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs)); - return 0; + mutex_unlock(&msi->map_lock); } -static const struct irq_domain_ops msi_domain_ops = { - .map = rcar_msi_map, +static const struct irq_domain_ops rcar_msi_domain_ops = { + .alloc = rcar_msi_domain_alloc, + .free = rcar_msi_domain_free, +}; + +static struct msi_domain_info rcar_msi_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | + MSI_FLAG_MULTI_PCI_MSI), + .chip = &rcar_msi_top_chip, }; -static void rcar_pcie_unmap_msi(struct rcar_pcie_host *host) +static int rcar_allocate_domains(struct rcar_msi *msi) { - struct rcar_msi *msi = &host->msi; - int i, irq; + struct rcar_pcie *pcie = &msi_to_host(msi)->pcie; + struct fwnode_handle *fwnode = dev_fwnode(pcie->dev); + struct irq_domain *parent; + + parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR, + &rcar_msi_domain_ops, msi); + if (!parent) { + dev_err(pcie->dev, "failed to create IRQ domain\n"); + return -ENOMEM; + } + irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS); - for (i = 0; i < INT_PCI_MSI_NR; i++) { - irq = irq_find_mapping(msi->domain, i); - if (irq > 0) - irq_dispose_mapping(irq); + msi->domain = pci_msi_create_irq_domain(fwnode, &rcar_msi_info, parent); + if (!msi->domain) { + dev_err(pcie->dev, "failed to create MSI domain\n"); + irq_domain_remove(parent); + return -ENOMEM; } - irq_domain_remove(msi->domain); + return 0; } -static void rcar_pcie_hw_enable_msi(struct rcar_pcie_host *host) +static void rcar_free_domains(struct rcar_msi *msi) { - struct rcar_pcie *pcie = &host->pcie; - struct rcar_msi *msi = &host->msi; - unsigned long base; - - /* setup MSI data target */ - base = virt_to_phys((void *)msi->pages); + struct irq_domain *parent = msi->domain->parent; - rcar_pci_write_reg(pcie, lower_32_bits(base) | MSIFE, PCIEMSIALR); - rcar_pci_write_reg(pcie, upper_32_bits(base), PCIEMSIAUR); - - /* enable all MSI interrupts */ - rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER); + irq_domain_remove(msi->domain); + irq_domain_remove(parent); } static int rcar_pcie_enable_msi(struct rcar_pcie_host *host) @@ -698,29 +674,24 @@ static int rcar_pcie_enable_msi(struct rcar_pcie_host *host) struct rcar_pcie *pcie = &host->pcie; struct device *dev = pcie->dev; struct rcar_msi *msi = &host->msi; - int err, i; - - mutex_init(&msi->lock); + struct resource res; + int err; - msi->chip.dev = dev; - msi->chip.setup_irq = rcar_msi_setup_irq; - msi->chip.setup_irqs = rcar_msi_setup_irqs; - msi->chip.teardown_irq = rcar_msi_teardown_irq; + mutex_init(&msi->map_lock); + spin_lock_init(&msi->mask_lock); - msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR, - &msi_domain_ops, &msi->chip); - if (!msi->domain) { - dev_err(dev, "failed to create IRQ domain\n"); - return -ENOMEM; - } + err = of_address_to_resource(dev->of_node, 0, &res); + if (err) + return err; - for (i = 0; i < INT_PCI_MSI_NR; i++) - irq_create_mapping(msi->domain, i); + err = rcar_allocate_domains(msi); + if (err) + return err; /* Two irqs are for MSI, but they are also used for non-MSI irqs */ err = devm_request_irq(dev, msi->irq1, rcar_pcie_msi_irq, IRQF_SHARED | IRQF_NO_THREAD, - rcar_msi_irq_chip.name, host); + rcar_msi_bottom_chip.name, host); if (err < 0) { dev_err(dev, "failed to request IRQ: %d\n", err); goto err; @@ -728,27 +699,32 @@ static int rcar_pcie_enable_msi(struct rcar_pcie_host *host) err = devm_request_irq(dev, msi->irq2, rcar_pcie_msi_irq, IRQF_SHARED | IRQF_NO_THREAD, - rcar_msi_irq_chip.name, host); + rcar_msi_bottom_chip.name, host); if (err < 0) { dev_err(dev, "failed to request IRQ: %d\n", err); goto err; } - /* setup MSI data target */ - msi->pages = __get_free_pages(GFP_KERNEL | GFP_DMA32, 0); - rcar_pcie_hw_enable_msi(host); + /* disable all MSIs */ + rcar_pci_write_reg(pcie, 0, PCIEMSIIER); + + /* + * Setup MSI data target using RC base address address, which + * is guaranteed to be in the low 32bit range on any RCar HW. + */ + rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR); + rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR); return 0; err: - rcar_pcie_unmap_msi(host); + rcar_free_domains(msi); return err; } static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host) { struct rcar_pcie *pcie = &host->pcie; - struct rcar_msi *msi = &host->msi; /* Disable all MSI interrupts */ rcar_pci_write_reg(pcie, 0, PCIEMSIIER); @@ -756,9 +732,7 @@ static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host) /* Disable address decoding of the MSI interrupt, MSIFE */ rcar_pci_write_reg(pcie, 0, PCIEMSIALR); - free_pages(msi->pages, 0); - - rcar_pcie_unmap_msi(host); + rcar_free_domains(&host->msi); } static int rcar_pcie_get_resources(struct rcar_pcie_host *host) @@ -1011,8 +985,17 @@ static int __maybe_unused rcar_pcie_resume(struct device *dev) dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f); /* Enable MSI */ - if (IS_ENABLED(CONFIG_PCI_MSI)) - rcar_pcie_hw_enable_msi(host); + if (IS_ENABLED(CONFIG_PCI_MSI)) { + struct resource res; + u32 val; + + of_address_to_resource(dev->of_node, 0, &res); + rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR); + rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR); + + bitmap_to_arr32(&val, host->msi.used, INT_PCI_MSI_NR); + rcar_pci_write_reg(pcie, val, PCIEMSIIER); + } rcar_pcie_hw_enable(host); diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c index fa5baeb82653..14001febf59a 100644 --- a/drivers/pci/controller/pcie-xilinx.c +++ b/drivers/pci/controller/pcie-xilinx.c @@ -93,25 +93,23 @@ /** * struct xilinx_pcie_port - PCIe port information * @reg_base: IO Mapped Register Base - * @irq: Interrupt number - * @msi_pages: MSI pages * @dev: Device pointer + * @msi_map: Bitmap of allocated MSIs + * @map_lock: Mutex protecting the MSI allocation * @msi_domain: MSI IRQ domain pointer * @leg_domain: Legacy IRQ domain pointer * @resources: Bus Resources */ struct xilinx_pcie_port { void __iomem *reg_base; - u32 irq; - unsigned long msi_pages; struct device *dev; + unsigned long msi_map[BITS_TO_LONGS(XILINX_NUM_MSI_IRQS)]; + struct mutex map_lock; struct irq_domain *msi_domain; struct irq_domain *leg_domain; struct list_head resources; }; -static DECLARE_BITMAP(msi_irq_in_use, XILINX_NUM_MSI_IRQS); - static inline u32 pcie_read(struct xilinx_pcie_port *port, u32 reg) { return readl(port->reg_base + reg); @@ -196,151 +194,118 @@ static struct pci_ops xilinx_pcie_ops = { /* MSI functions */ -/** - * xilinx_pcie_destroy_msi - Free MSI number - * @irq: IRQ to be freed - */ -static void xilinx_pcie_destroy_msi(unsigned int irq) +static void xilinx_msi_top_irq_ack(struct irq_data *d) { - struct msi_desc *msi; - struct xilinx_pcie_port *port; - struct irq_data *d = irq_get_irq_data(irq); - irq_hw_number_t hwirq = irqd_to_hwirq(d); - - if (!test_bit(hwirq, msi_irq_in_use)) { - msi = irq_get_msi_desc(irq); - port = msi_desc_to_pci_sysdata(msi); - dev_err(port->dev, "Trying to free unused MSI#%d\n", irq); - } else { - clear_bit(hwirq, msi_irq_in_use); - } + /* + * xilinx_pcie_intr_handler() will have performed the Ack. + * Eventually, this should be fixed and the Ack be moved in + * the respective callbacks for INTx and MSI. + */ } -/** - * xilinx_pcie_assign_msi - Allocate MSI number - * - * Return: A valid IRQ on success and error value on failure. - */ -static int xilinx_pcie_assign_msi(void) -{ - int pos; - - pos = find_first_zero_bit(msi_irq_in_use, XILINX_NUM_MSI_IRQS); - if (pos < XILINX_NUM_MSI_IRQS) - set_bit(pos, msi_irq_in_use); - else - return -ENOSPC; +static struct irq_chip xilinx_msi_top_chip = { + .name = "PCIe MSI", + .irq_ack = xilinx_msi_top_irq_ack, +}; - return pos; +static int xilinx_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force) +{ + return -EINVAL; } -/** - * xilinx_msi_teardown_irq - Destroy the MSI - * @chip: MSI Chip descriptor - * @irq: MSI IRQ to destroy - */ -static void xilinx_msi_teardown_irq(struct msi_controller *chip, - unsigned int irq) +static void xilinx_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) { - xilinx_pcie_destroy_msi(irq); - irq_dispose_mapping(irq); + struct xilinx_pcie_port *pcie = irq_data_get_irq_chip_data(data); + phys_addr_t pa = ALIGN_DOWN(virt_to_phys(pcie), SZ_4K); + + msg->address_lo = lower_32_bits(pa); + msg->address_hi = upper_32_bits(pa); + msg->data = data->hwirq; } -/** - * xilinx_pcie_msi_setup_irq - Setup MSI request - * @chip: MSI chip pointer - * @pdev: PCIe device pointer - * @desc: MSI descriptor pointer - * - * Return: '0' on success and error value on failure - */ -static int xilinx_pcie_msi_setup_irq(struct msi_controller *chip, - struct pci_dev *pdev, - struct msi_desc *desc) -{ - struct xilinx_pcie_port *port = pdev->bus->sysdata; - unsigned int irq; - int hwirq; - struct msi_msg msg; - phys_addr_t msg_addr; +static struct irq_chip xilinx_msi_bottom_chip = { + .name = "Xilinx MSI", + .irq_set_affinity = xilinx_msi_set_affinity, + .irq_compose_msi_msg = xilinx_compose_msi_msg, +}; - hwirq = xilinx_pcie_assign_msi(); - if (hwirq < 0) - return hwirq; +static int xilinx_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *args) +{ + struct xilinx_pcie_port *port = domain->host_data; + int hwirq, i; - irq = irq_create_mapping(port->msi_domain, hwirq); - if (!irq) - return -EINVAL; + mutex_lock(&port->map_lock); - irq_set_msi_desc(irq, desc); + hwirq = bitmap_find_free_region(port->msi_map, XILINX_NUM_MSI_IRQS, order_base_2(nr_irqs)); - msg_addr = virt_to_phys((void *)port->msi_pages); + mutex_unlock(&port->map_lock); - msg.address_hi = 0; - msg.address_lo = msg_addr; - msg.data = irq; + if (hwirq < 0) + return -ENOSPC; - pci_write_msi_msg(irq, &msg); + for (i = 0; i < nr_irqs; i++) + irq_domain_set_info(domain, virq + i, hwirq + i, + &xilinx_msi_bottom_chip, domain->host_data, + handle_edge_irq, NULL, NULL); return 0; } -/* MSI Chip Descriptor */ -static struct msi_controller xilinx_pcie_msi_chip = { - .setup_irq = xilinx_pcie_msi_setup_irq, - .teardown_irq = xilinx_msi_teardown_irq, -}; +static void xilinx_msi_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *d = irq_domain_get_irq_data(domain, virq); + struct xilinx_pcie_port *port = domain->host_data; -/* HW Interrupt Chip Descriptor */ -static struct irq_chip xilinx_msi_irq_chip = { - .name = "Xilinx PCIe MSI", - .irq_enable = pci_msi_unmask_irq, - .irq_disable = pci_msi_mask_irq, - .irq_mask = pci_msi_mask_irq, - .irq_unmask = pci_msi_unmask_irq, -}; + mutex_lock(&port->map_lock); -/** - * xilinx_pcie_msi_map - Set the handler for the MSI and mark IRQ as valid - * @domain: IRQ domain - * @irq: Virtual IRQ number - * @hwirq: HW interrupt number - * - * Return: Always returns 0. - */ -static int xilinx_pcie_msi_map(struct irq_domain *domain, unsigned int irq, - irq_hw_number_t hwirq) -{ - irq_set_chip_and_handler(irq, &xilinx_msi_irq_chip, handle_simple_irq); - irq_set_chip_data(irq, domain->host_data); + bitmap_release_region(port->msi_map, d->hwirq, order_base_2(nr_irqs)); - return 0; + mutex_unlock(&port->map_lock); } -/* IRQ Domain operations */ -static const struct irq_domain_ops msi_domain_ops = { - .map = xilinx_pcie_msi_map, +static const struct irq_domain_ops xilinx_msi_domain_ops = { + .alloc = xilinx_msi_domain_alloc, + .free = xilinx_msi_domain_free, }; -/** - * xilinx_pcie_enable_msi - Enable MSI support - * @port: PCIe port information - */ -static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port) +static struct msi_domain_info xilinx_msi_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), + .chip = &xilinx_msi_top_chip, +}; + +static int xilinx_allocate_msi_domains(struct xilinx_pcie_port *pcie) { - phys_addr_t msg_addr; + struct fwnode_handle *fwnode = dev_fwnode(pcie->dev); + struct irq_domain *parent; - port->msi_pages = __get_free_pages(GFP_KERNEL, 0); - if (!port->msi_pages) + parent = irq_domain_create_linear(fwnode, XILINX_NUM_MSI_IRQS, + &xilinx_msi_domain_ops, pcie); + if (!parent) { + dev_err(pcie->dev, "failed to create IRQ domain\n"); return -ENOMEM; + } + irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS); - msg_addr = virt_to_phys((void *)port->msi_pages); - pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1); - pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2); + pcie->msi_domain = pci_msi_create_irq_domain(fwnode, &xilinx_msi_info, parent); + if (!pcie->msi_domain) { + dev_err(pcie->dev, "failed to create MSI domain\n"); + irq_domain_remove(parent); + return -ENOMEM; + } return 0; } +static void xilinx_free_msi_domains(struct xilinx_pcie_port *pcie) +{ + struct irq_domain *parent = pcie->msi_domain->parent; + + irq_domain_remove(pcie->msi_domain); + irq_domain_remove(parent); +} + /* INTx Functions */ /** @@ -420,6 +385,8 @@ static irqreturn_t xilinx_pcie_intr_handler(int irq, void *data) } if (status & (XILINX_PCIE_INTR_INTX | XILINX_PCIE_INTR_MSI)) { + unsigned int irq; + val = pcie_read(port, XILINX_PCIE_REG_RPIFR1); /* Check whether interrupt valid */ @@ -432,20 +399,19 @@ static irqreturn_t xilinx_pcie_intr_handler(int irq, void *data) if (val & XILINX_PCIE_RPIFR1_MSI_INTR) { val = pcie_read(port, XILINX_PCIE_REG_RPIFR2) & XILINX_PCIE_RPIFR2_MSG_DATA; + irq = irq_find_mapping(port->msi_domain->parent, val); } else { val = (val & XILINX_PCIE_RPIFR1_INTR_MASK) >> XILINX_PCIE_RPIFR1_INTR_SHIFT; - val = irq_find_mapping(port->leg_domain, val); + irq = irq_find_mapping(port->leg_domain, val); } /* Clear interrupt FIFO register 1 */ pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK, XILINX_PCIE_REG_RPIFR1); - /* Handle the interrupt */ - if (IS_ENABLED(CONFIG_PCI_MSI) || - !(val & XILINX_PCIE_RPIFR1_MSI_INTR)) - generic_handle_irq(val); + if (irq) + generic_handle_irq(irq); } if (status & XILINX_PCIE_INTR_SLV_UNSUPP) @@ -491,12 +457,11 @@ error: static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port) { struct device *dev = port->dev; - struct device_node *node = dev->of_node; struct device_node *pcie_intc_node; int ret; /* Setup INTx */ - pcie_intc_node = of_get_next_child(node, NULL); + pcie_intc_node = of_get_next_child(dev->of_node, NULL); if (!pcie_intc_node) { dev_err(dev, "No PCIe Intc node found\n"); return -ENODEV; @@ -513,18 +478,14 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port) /* Setup MSI */ if (IS_ENABLED(CONFIG_PCI_MSI)) { - port->msi_domain = irq_domain_add_linear(node, - XILINX_NUM_MSI_IRQS, - &msi_domain_ops, - &xilinx_pcie_msi_chip); - if (!port->msi_domain) { - dev_err(dev, "Failed to get a MSI IRQ domain\n"); - return -ENODEV; - } + phys_addr_t pa = ALIGN_DOWN(virt_to_phys(port), SZ_4K); - ret = xilinx_pcie_enable_msi(port); + ret = xilinx_allocate_msi_domains(port); if (ret) return ret; + + pcie_write(port, upper_32_bits(pa), XILINX_PCIE_REG_MSIBASE1); + pcie_write(port, lower_32_bits(pa), XILINX_PCIE_REG_MSIBASE2); } return 0; @@ -572,6 +533,7 @@ static int xilinx_pcie_parse_dt(struct xilinx_pcie_port *port) struct device *dev = port->dev; struct device_node *node = dev->of_node; struct resource regs; + unsigned int irq; int err; err = of_address_to_resource(node, 0, ®s); @@ -584,12 +546,12 @@ static int xilinx_pcie_parse_dt(struct xilinx_pcie_port *port) if (IS_ERR(port->reg_base)) return PTR_ERR(port->reg_base); - port->irq = irq_of_parse_and_map(node, 0); - err = devm_request_irq(dev, port->irq, xilinx_pcie_intr_handler, + irq = irq_of_parse_and_map(node, 0); + err = devm_request_irq(dev, irq, xilinx_pcie_intr_handler, IRQF_SHARED | IRQF_NO_THREAD, "xilinx-pcie", port); if (err) { - dev_err(dev, "unable to request irq %d\n", port->irq); + dev_err(dev, "unable to request irq %d\n", irq); return err; } @@ -617,7 +579,7 @@ static int xilinx_pcie_probe(struct platform_device *pdev) return -ENODEV; port = pci_host_bridge_priv(bridge); - + mutex_init(&port->map_lock); port->dev = dev; err = xilinx_pcie_parse_dt(port); @@ -637,11 +599,11 @@ static int xilinx_pcie_probe(struct platform_device *pdev) bridge->sysdata = port; bridge->ops = &xilinx_pcie_ops; -#ifdef CONFIG_PCI_MSI - xilinx_pcie_msi_chip.dev = dev; - bridge->msi = &xilinx_pcie_msi_chip; -#endif - return pci_host_probe(bridge); + err = pci_host_probe(bridge); + if (err) + xilinx_free_msi_domains(port); + + return err; } static const struct of_device_id xilinx_pcie_of_match[] = { diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 3162f88fe940..217dc9f0231f 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -64,39 +64,18 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev) /* Arch hooks */ int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) { - struct msi_controller *chip = dev->bus->msi; - int err; - - if (!chip || !chip->setup_irq) - return -EINVAL; - - err = chip->setup_irq(chip, dev, desc); - if (err < 0) - return err; - - irq_set_chip_data(desc->irq, chip); - - return 0; + return -EINVAL; } void __weak arch_teardown_msi_irq(unsigned int irq) { - struct msi_controller *chip = irq_get_chip_data(irq); - - if (!chip || !chip->teardown_irq) - return; - - chip->teardown_irq(chip, irq); } int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) { - struct msi_controller *chip = dev->bus->msi; struct msi_desc *entry; int ret; - if (chip && chip->setup_irqs) - return chip->setup_irqs(chip, dev, nvec, type); /* * If an architecture wants to support multiple MSI, it needs to * override arch_setup_msi_irqs() @@ -115,11 +94,7 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) return 0; } -/* - * We have a default implementation available as a separate non-weak - * function, as it is used by the Xen x86 PCI code - */ -void default_teardown_msi_irqs(struct pci_dev *dev) +void __weak arch_teardown_msi_irqs(struct pci_dev *dev) { int i; struct msi_desc *entry; @@ -129,11 +104,6 @@ void default_teardown_msi_irqs(struct pci_dev *dev) for (i = 0; i < entry->nvec_used; i++) arch_teardown_msi_irq(entry->irq + i); } - -void __weak arch_teardown_msi_irqs(struct pci_dev *dev) -{ - return default_teardown_msi_irqs(dev); -} #endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */ static void default_restore_msi_irq(struct pci_dev *dev, int irq) @@ -901,8 +871,15 @@ static int pci_msi_supported(struct pci_dev *dev, int nvec) * Any bridge which does NOT route MSI transactions from its * secondary bus to its primary bus must set NO_MSI flag on * the secondary pci_bus. - * We expect only arch-specific PCI host bus controller driver - * or quirks for specific PCI bridges to be setting NO_MSI. + * + * The NO_MSI flag can either be set directly by: + * - arch-specific PCI host bus controller drivers (deprecated) + * - quirks for specific PCI bridges + * + * or indirectly by platform-specific PCI host bridge drivers by + * advertising the 'msi_domain' property, which results in + * the NO_MSI flag when no MSI domain is found for this bridge + * at probe time. */ for (bus = dev->bus; bus; bus = bus->parent) if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index be51670572fa..3a62d09b8869 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -895,7 +895,6 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge) /* Temporarily move resources off the list */ list_splice_init(&bridge->windows, &resources); bus->sysdata = bridge->sysdata; - bus->msi = bridge->msi; bus->ops = bridge->ops; bus->number = bus->busn_res.start = bridge->busnr; #ifdef CONFIG_PCI_DOMAINS_GENERIC @@ -926,6 +925,8 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge) device_enable_async_suspend(bus->bridge); pci_set_bus_of_node(bus); pci_set_bus_msi_domain(bus); + if (bridge->msi_domain && !dev_get_msi_domain(&bus->dev)) + bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; if (!parent) set_dev_node(bus->bridge, pcibus_to_node(bus)); @@ -1053,7 +1054,6 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, return NULL; child->parent = parent; - child->msi = parent->msi; child->sysdata = parent->sysdata; child->bus_flags = parent->bus_flags; diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index af43b340853e..dcb229de1acb 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2580,10 +2580,8 @@ static int msi_ht_cap_enabled(struct pci_dev *dev) /* Check the HyperTransport MSI mapping to know whether MSI is enabled or not */ static void quirk_msi_ht_cap(struct pci_dev *dev) { - if (dev->subordinate && !msi_ht_cap_enabled(dev)) { - pci_warn(dev, "MSI quirk detected; subordinate MSI disabled\n"); - dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; - } + if (!msi_ht_cap_enabled(dev)) + quirk_disable_msi(dev); } DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE, quirk_msi_ht_cap); @@ -2596,9 +2594,6 @@ static void quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev) { struct pci_dev *pdev; - if (!dev->subordinate) - return; - /* * Check HT MSI cap on this chipset and the root one. A single one * having MSI is enough to be sure that MSI is supported. @@ -2606,10 +2601,8 @@ static void quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev) pdev = pci_get_slot(dev->bus, 0); if (!pdev) return; - if (!msi_ht_cap_enabled(dev) && !msi_ht_cap_enabled(pdev)) { - pci_warn(dev, "MSI quirk detected; subordinate MSI disabled\n"); - dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; - } + if (!msi_ht_cap_enabled(pdev)) + quirk_msi_ht_cap(dev); pci_dev_put(pdev); } DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE, diff --git a/include/linux/msi.h b/include/linux/msi.h index aef35fd1cf11..6aff469e511d 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -240,8 +240,7 @@ void pci_msi_unmask_irq(struct irq_data *data); /* * The arch hooks to setup up msi irqs. Default functions are implemented * as weak symbols so that they /can/ be overriden by architecture specific - * code if needed. These hooks must be enabled by the architecture or by - * drivers which depend on them via msi_controller based MSI handling. + * code if needed. These hooks can only be enabled by the architecture. * * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by * stubs with warnings. @@ -251,7 +250,6 @@ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); void arch_teardown_msi_irq(unsigned int irq); int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); void arch_teardown_msi_irqs(struct pci_dev *dev); -void default_teardown_msi_irqs(struct pci_dev *dev); #else static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) { @@ -272,19 +270,6 @@ static inline void arch_teardown_msi_irqs(struct pci_dev *dev) void arch_restore_msi_irqs(struct pci_dev *dev); void default_restore_msi_irqs(struct pci_dev *dev); -struct msi_controller { - struct module *owner; - struct device *dev; - struct device_node *of_node; - struct list_head list; - - int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev, - struct msi_desc *desc); - int (*setup_irqs)(struct msi_controller *chip, struct pci_dev *dev, - int nvec, int type); - void (*teardown_irq)(struct msi_controller *chip, unsigned int irq); -}; - #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN #include <linux/irqhandler.h> diff --git a/include/linux/pci.h b/include/linux/pci.h index ce17dbc687b4..a69705378383 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -539,7 +539,6 @@ struct pci_host_bridge { int (*map_irq)(const struct pci_dev *, u8, u8); void (*release_fn)(struct pci_host_bridge *); void *release_data; - struct msi_controller *msi; unsigned int ignore_reset_delay:1; /* For entire hierarchy */ unsigned int no_ext_tags:1; /* No Extended Tags */ unsigned int native_aer:1; /* OS may use PCIe AER */ @@ -550,6 +549,7 @@ struct pci_host_bridge { unsigned int native_dpc:1; /* OS may use PCIe DPC */ unsigned int preserve_config:1; /* Preserve FW resource setup */ unsigned int size_windows:1; /* Enable root bus sizing */ + unsigned int msi_domain:1; /* Bridge wants MSI domain */ /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev, @@ -620,7 +620,6 @@ struct pci_bus { struct resource busn_res; /* Bus numbers routed to this bus */ struct pci_ops *ops; /* Configuration access functions */ - struct msi_controller *msi; /* MSI controller */ void *sysdata; /* Hook for sys-specific extension */ struct proc_dir_entry *procdir; /* Directory entry in /proc/bus/pci */ |