diff options
Diffstat (limited to 'drivers/pci/pcie/aer/aerdrv.c')
| -rw-r--r-- | drivers/pci/pcie/aer/aerdrv.c | 371 |
1 files changed, 0 insertions, 371 deletions
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c deleted file mode 100644 index 9735c19bf39c..000000000000 --- a/drivers/pci/pcie/aer/aerdrv.c +++ /dev/null @@ -1,371 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Implement the AER root port service driver. The driver registers an IRQ - * handler. When a root port triggers an AER interrupt, the IRQ handler - * collects root port status and schedules work. - * - * Copyright (C) 2006 Intel Corp. - * Tom Long Nguyen (tom.l.nguyen@intel.com) - * Zhang Yanmin (yanmin.zhang@intel.com) - */ - -#include <linux/pci.h> -#include <linux/pci-acpi.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/pm.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/slab.h> - -#include "aerdrv.h" -#include "../../pci.h" - -static int aer_probe(struct pcie_device *dev); -static void aer_remove(struct pcie_device *dev); -static void aer_error_resume(struct pci_dev *dev); -static pci_ers_result_t aer_root_reset(struct pci_dev *dev); - -static struct pcie_port_service_driver aerdriver = { - .name = "aer", - .port_type = PCI_EXP_TYPE_ROOT_PORT, - .service = PCIE_PORT_SERVICE_AER, - - .probe = aer_probe, - .remove = aer_remove, - .error_resume = aer_error_resume, - .reset_link = aer_root_reset, -}; - -static int pcie_aer_disable; - -void pci_no_aer(void) -{ - pcie_aer_disable = 1; -} - -bool pci_aer_available(void) -{ - return !pcie_aer_disable && pci_msi_enabled(); -} - -static int set_device_error_reporting(struct pci_dev *dev, void *data) -{ - bool enable = *((bool *)data); - int type = pci_pcie_type(dev); - - if ((type == PCI_EXP_TYPE_ROOT_PORT) || - (type == PCI_EXP_TYPE_UPSTREAM) || - (type == PCI_EXP_TYPE_DOWNSTREAM)) { - if (enable) - pci_enable_pcie_error_reporting(dev); - else - pci_disable_pcie_error_reporting(dev); - } - - if (enable) - pcie_set_ecrc_checking(dev); - - return 0; -} - -/** - * set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports. - * @dev: pointer to root port's pci_dev data structure - * @enable: true = enable error reporting, false = disable error reporting. - */ -static void set_downstream_devices_error_reporting(struct pci_dev *dev, - bool enable) -{ - set_device_error_reporting(dev, &enable); - - if (!dev->subordinate) - return; - pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable); -} - -/** - * aer_enable_rootport - enable Root Port's interrupts when receiving messages - * @rpc: pointer to a Root Port data structure - * - * Invoked when PCIe bus loads AER service driver. - */ -static void aer_enable_rootport(struct aer_rpc *rpc) -{ - struct pci_dev *pdev = rpc->rpd; - int aer_pos; - u16 reg16; - u32 reg32; - - /* Clear PCIe Capability's Device Status */ - pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, ®16); - pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16); - - /* Disable system error generation in response to error messages */ - pcie_capability_clear_word(pdev, PCI_EXP_RTCTL, - SYSTEM_ERROR_INTR_ON_MESG_MASK); - - aer_pos = pdev->aer_cap; - /* Clear error status */ - pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32); - pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32); - pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32); - pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32); - pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32); - pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32); - - /* - * Enable error reporting for the root port device and downstream port - * devices. - */ - set_downstream_devices_error_reporting(pdev, true); - - /* Enable Root Port's interrupt in response to error messages */ - pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, ®32); - reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, reg32); -} - -/** - * aer_disable_rootport - disable Root Port's interrupts when receiving messages - * @rpc: pointer to a Root Port data structure - * - * Invoked when PCIe bus unloads AER service driver. - */ -static void aer_disable_rootport(struct aer_rpc *rpc) -{ - struct pci_dev *pdev = rpc->rpd; - u32 reg32; - int pos; - - /* - * Disable error reporting for the root port device and downstream port - * devices. - */ - set_downstream_devices_error_reporting(pdev, false); - - pos = pdev->aer_cap; - /* Disable Root's interrupt in response to error messages */ - pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, ®32); - reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, reg32); - - /* Clear Root's error status reg */ - pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32); - pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32); -} - -/** - * aer_irq - Root Port's ISR - * @irq: IRQ assigned to Root Port - * @context: pointer to Root Port data structure - * - * Invoked when Root Port detects AER messages. - */ -irqreturn_t aer_irq(int irq, void *context) -{ - unsigned int status, id; - struct pcie_device *pdev = (struct pcie_device *)context; - struct aer_rpc *rpc = get_service_data(pdev); - int next_prod_idx; - unsigned long flags; - int pos; - - pos = pdev->port->aer_cap; - /* - * Must lock access to Root Error Status Reg, Root Error ID Reg, - * and Root error producer/consumer index - */ - spin_lock_irqsave(&rpc->e_lock, flags); - - /* Read error status */ - pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status); - if (!(status & (PCI_ERR_ROOT_UNCOR_RCV|PCI_ERR_ROOT_COR_RCV))) { - spin_unlock_irqrestore(&rpc->e_lock, flags); - return IRQ_NONE; - } - - /* Read error source and clear error status */ - pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_ERR_SRC, &id); - pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status); - - /* Store error source for later DPC handler */ - next_prod_idx = rpc->prod_idx + 1; - if (next_prod_idx == AER_ERROR_SOURCES_MAX) - next_prod_idx = 0; - if (next_prod_idx == rpc->cons_idx) { - /* - * Error Storm Condition - possibly the same error occurred. - * Drop the error. - */ - spin_unlock_irqrestore(&rpc->e_lock, flags); - return IRQ_HANDLED; - } - rpc->e_sources[rpc->prod_idx].status = status; - rpc->e_sources[rpc->prod_idx].id = id; - rpc->prod_idx = next_prod_idx; - spin_unlock_irqrestore(&rpc->e_lock, flags); - - /* Invoke DPC handler */ - schedule_work(&rpc->dpc_handler); - - return IRQ_HANDLED; -} -EXPORT_SYMBOL_GPL(aer_irq); - -/** - * aer_alloc_rpc - allocate Root Port data structure - * @dev: pointer to the pcie_dev data structure - * - * Invoked when Root Port's AER service is loaded. - */ -static struct aer_rpc *aer_alloc_rpc(struct pcie_device *dev) -{ - struct aer_rpc *rpc; - - rpc = kzalloc(sizeof(struct aer_rpc), GFP_KERNEL); - if (!rpc) - return NULL; - - /* Initialize Root lock access, e_lock, to Root Error Status Reg */ - spin_lock_init(&rpc->e_lock); - - rpc->rpd = dev->port; - INIT_WORK(&rpc->dpc_handler, aer_isr); - mutex_init(&rpc->rpc_mutex); - - /* Use PCIe bus function to store rpc into PCIe device */ - set_service_data(dev, rpc); - - return rpc; -} - -/** - * aer_remove - clean up resources - * @dev: pointer to the pcie_dev data structure - * - * Invoked when PCI Express bus unloads or AER probe fails. - */ -static void aer_remove(struct pcie_device *dev) -{ - struct aer_rpc *rpc = get_service_data(dev); - - if (rpc) { - /* If register interrupt service, it must be free. */ - if (rpc->isr) - free_irq(dev->irq, dev); - - flush_work(&rpc->dpc_handler); - aer_disable_rootport(rpc); - kfree(rpc); - set_service_data(dev, NULL); - } -} - -/** - * aer_probe - initialize resources - * @dev: pointer to the pcie_dev data structure - * - * Invoked when PCI Express bus loads AER service driver. - */ -static int aer_probe(struct pcie_device *dev) -{ - int status; - struct aer_rpc *rpc; - struct device *device = &dev->port->dev; - - /* Alloc rpc data structure */ - rpc = aer_alloc_rpc(dev); - if (!rpc) { - dev_printk(KERN_DEBUG, device, "alloc AER rpc failed\n"); - aer_remove(dev); - return -ENOMEM; - } - - /* Request IRQ ISR */ - status = request_irq(dev->irq, aer_irq, IRQF_SHARED, "aerdrv", dev); - if (status) { - dev_printk(KERN_DEBUG, device, "request AER IRQ %d failed\n", - dev->irq); - aer_remove(dev); - return status; - } - - rpc->isr = 1; - - aer_enable_rootport(rpc); - dev_info(device, "AER enabled with IRQ %d\n", dev->irq); - return 0; -} - -/** - * aer_root_reset - reset link on Root Port - * @dev: pointer to Root Port's pci_dev data structure - * - * Invoked by Port Bus driver when performing link reset at Root Port. - */ -static pci_ers_result_t aer_root_reset(struct pci_dev *dev) -{ - u32 reg32; - int pos; - - pos = dev->aer_cap; - - /* Disable Root's interrupt in response to error messages */ - pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, ®32); - reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); - - pci_reset_bridge_secondary_bus(dev); - pci_printk(KERN_DEBUG, dev, "Root Port link has been reset\n"); - - /* Clear Root Error Status */ - pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32); - pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, reg32); - - /* Enable Root Port's interrupt in response to error messages */ - pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, ®32); - reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); - - return PCI_ERS_RESULT_RECOVERED; -} - -/** - * aer_error_resume - clean up corresponding error status bits - * @dev: pointer to Root Port's pci_dev data structure - * - * Invoked by Port Bus driver during nonfatal recovery. - */ -static void aer_error_resume(struct pci_dev *dev) -{ - int pos; - u32 status, mask; - u16 reg16; - - /* Clean up Root device status */ - pcie_capability_read_word(dev, PCI_EXP_DEVSTA, ®16); - pcie_capability_write_word(dev, PCI_EXP_DEVSTA, reg16); - - /* Clean AER Root Error Status */ - pos = dev->aer_cap; - pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); - pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask); - status &= ~mask; /* Clear corresponding nonfatal bits */ - pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); -} - -/** - * aer_service_init - register AER root service driver - * - * Invoked when AER root service driver is loaded. - */ -static int __init aer_service_init(void) -{ - if (!pci_aer_available() || aer_acpi_firmware_first()) - return -ENXIO; - return pcie_port_service_register(&aerdriver); -} -device_initcall(aer_service_init); |