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7e16fd6df1
PCIe port type values are not flags, so OR'ing them is not correct. Previously the result was equivalent to PCIe Downstream Ports, so we were missing binding to DPC-capable Root Ports. Change the type to 'any' so we can bind to both port types. While this will cause the code to check Upstream Ports, the driver won't claim them since they are not DPC-capable. Reported-by: Alexander Antonov <alexanderx.v.antonov@intel.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Mika Westerberg <mika.westerberg@linux.intel.com>
158 lines
4.5 KiB
C
158 lines
4.5 KiB
C
/*
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* PCI Express Downstream Port Containment services driver
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* Copyright (C) 2016 Intel Corp.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/pcieport_if.h>
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struct dpc_dev {
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struct pcie_device *dev;
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struct work_struct work;
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int cap_pos;
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};
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static void dpc_wait_link_inactive(struct pci_dev *pdev)
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{
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unsigned long timeout = jiffies + HZ;
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u16 lnk_status;
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pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
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while (lnk_status & PCI_EXP_LNKSTA_DLLLA &&
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!time_after(jiffies, timeout)) {
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msleep(10);
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pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
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}
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if (lnk_status & PCI_EXP_LNKSTA_DLLLA)
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dev_warn(&pdev->dev, "Link state not disabled for DPC event");
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}
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static void interrupt_event_handler(struct work_struct *work)
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{
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struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
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struct pci_dev *dev, *temp, *pdev = dpc->dev->port;
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struct pci_bus *parent = pdev->subordinate;
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pci_lock_rescan_remove();
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list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
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bus_list) {
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pci_dev_get(dev);
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pci_stop_and_remove_bus_device(dev);
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pci_dev_put(dev);
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}
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pci_unlock_rescan_remove();
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dpc_wait_link_inactive(pdev);
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pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS,
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PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT);
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}
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static irqreturn_t dpc_irq(int irq, void *context)
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{
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struct dpc_dev *dpc = (struct dpc_dev *)context;
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struct pci_dev *pdev = dpc->dev->port;
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u16 status, source;
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pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status);
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pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_SOURCE_ID,
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&source);
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if (!status)
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return IRQ_NONE;
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dev_info(&dpc->dev->device, "DPC containment event, status:%#06x source:%#06x\n",
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status, source);
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if (status & PCI_EXP_DPC_STATUS_TRIGGER) {
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u16 reason = (status >> 1) & 0x3;
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dev_warn(&dpc->dev->device, "DPC %s triggered, remove downstream devices\n",
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(reason == 0) ? "unmasked uncorrectable error" :
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(reason == 1) ? "ERR_NONFATAL" :
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(reason == 2) ? "ERR_FATAL" : "extended error");
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schedule_work(&dpc->work);
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}
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return IRQ_HANDLED;
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}
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#define FLAG(x, y) (((x) & (y)) ? '+' : '-')
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static int dpc_probe(struct pcie_device *dev)
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{
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struct dpc_dev *dpc;
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struct pci_dev *pdev = dev->port;
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int status;
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u16 ctl, cap;
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dpc = devm_kzalloc(&dev->device, sizeof(*dpc), GFP_KERNEL);
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if (!dpc)
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return -ENOMEM;
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dpc->cap_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC);
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dpc->dev = dev;
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INIT_WORK(&dpc->work, interrupt_event_handler);
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set_service_data(dev, dpc);
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status = devm_request_irq(&dev->device, dev->irq, dpc_irq, IRQF_SHARED,
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"pcie-dpc", dpc);
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if (status) {
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dev_warn(&dev->device, "request IRQ%d failed: %d\n", dev->irq,
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status);
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return status;
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}
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pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap);
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pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
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ctl |= PCI_EXP_DPC_CTL_EN_NONFATAL | PCI_EXP_DPC_CTL_INT_EN;
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pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl);
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dev_info(&dev->device, "DPC error containment capabilities: Int Msg #%d, RPExt%c PoisonedTLP%c SwTrigger%c RP PIO Log %d, DL_ActiveErr%c\n",
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cap & 0xf, FLAG(cap, PCI_EXP_DPC_CAP_RP_EXT),
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FLAG(cap, PCI_EXP_DPC_CAP_POISONED_TLP),
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FLAG(cap, PCI_EXP_DPC_CAP_SW_TRIGGER), (cap >> 8) & 0xf,
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FLAG(cap, PCI_EXP_DPC_CAP_DL_ACTIVE));
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return status;
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}
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static void dpc_remove(struct pcie_device *dev)
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{
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struct dpc_dev *dpc = get_service_data(dev);
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struct pci_dev *pdev = dev->port;
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u16 ctl;
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pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
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ctl &= ~(PCI_EXP_DPC_CTL_EN_NONFATAL | PCI_EXP_DPC_CTL_INT_EN);
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pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl);
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}
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static struct pcie_port_service_driver dpcdriver = {
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.name = "dpc",
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.port_type = PCIE_ANY_PORT,
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.service = PCIE_PORT_SERVICE_DPC,
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.probe = dpc_probe,
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.remove = dpc_remove,
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};
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static int __init dpc_service_init(void)
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{
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return pcie_port_service_register(&dpcdriver);
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}
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static void __exit dpc_service_exit(void)
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{
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pcie_port_service_unregister(&dpcdriver);
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}
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MODULE_DESCRIPTION("PCI Express Downstream Port Containment driver");
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MODULE_AUTHOR("Keith Busch <keith.busch@intel.com>");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("0.1");
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module_init(dpc_service_init);
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module_exit(dpc_service_exit);
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