308 lines
9.1 KiB
C
308 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCI Express Downstream Port Containment services driver
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* Author: Keith Busch <keith.busch@intel.com>
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*
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* Copyright (C) 2016 Intel Corp.
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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/init.h>
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#include <linux/pci.h>
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#include "portdrv.h"
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#include "../pci.h"
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#include "aer/aerdrv.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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u16 cap_pos;
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bool rp_extensions;
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u32 rp_pio_status;
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u8 rp_log_size;
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};
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static const char * const rp_pio_error_string[] = {
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"Configuration Request received UR Completion", /* Bit Position 0 */
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"Configuration Request received CA Completion", /* Bit Position 1 */
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"Configuration Request Completion Timeout", /* Bit Position 2 */
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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"I/O Request received UR Completion", /* Bit Position 8 */
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"I/O Request received CA Completion", /* Bit Position 9 */
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"I/O Request Completion Timeout", /* Bit Position 10 */
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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"Memory Request received UR Completion", /* Bit Position 16 */
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"Memory Request received CA Completion", /* Bit Position 17 */
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"Memory Request Completion Timeout", /* Bit Position 18 */
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};
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static int dpc_wait_rp_inactive(struct dpc_dev *dpc)
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{
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unsigned long timeout = jiffies + HZ;
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struct pci_dev *pdev = dpc->dev->port;
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struct device *dev = &dpc->dev->device;
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u16 cap = dpc->cap_pos, status;
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pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
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while (status & PCI_EXP_DPC_RP_BUSY &&
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!time_after(jiffies, timeout)) {
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msleep(10);
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pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
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}
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if (status & PCI_EXP_DPC_RP_BUSY) {
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dev_warn(dev, "DPC root port still busy\n");
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return -EBUSY;
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}
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return 0;
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}
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static void dpc_wait_link_inactive(struct dpc_dev *dpc)
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{
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unsigned long timeout = jiffies + HZ;
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struct pci_dev *pdev = dpc->dev->port;
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struct device *dev = &dpc->dev->device;
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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(dev, "Link state not disabled for DPC event\n");
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}
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static void dpc_work(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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u16 cap = dpc->cap_pos, ctl;
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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_dev_set_disconnected(dev, NULL);
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if (pci_has_subordinate(dev))
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pci_walk_bus(dev->subordinate,
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pci_dev_set_disconnected, NULL);
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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(dpc);
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if (dpc->rp_extensions && dpc_wait_rp_inactive(dpc))
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return;
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if (dpc->rp_extensions && dpc->rp_pio_status) {
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pci_write_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS,
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dpc->rp_pio_status);
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dpc->rp_pio_status = 0;
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}
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pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
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PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT);
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pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl);
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pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL,
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ctl | PCI_EXP_DPC_CTL_INT_EN);
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}
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static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
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{
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struct device *dev = &dpc->dev->device;
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struct pci_dev *pdev = dpc->dev->port;
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u16 cap = dpc->cap_pos, dpc_status, first_error;
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u32 status, mask, sev, syserr, exc, dw0, dw1, dw2, dw3, log, prefix;
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int i;
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS, &status);
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_MASK, &mask);
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dev_err(dev, "rp_pio_status: %#010x, rp_pio_mask: %#010x\n",
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status, mask);
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dpc->rp_pio_status = status;
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SEVERITY, &sev);
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SYSERROR, &syserr);
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_EXCEPTION, &exc);
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dev_err(dev, "RP PIO severity=%#010x, syserror=%#010x, exception=%#010x\n",
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sev, syserr, exc);
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/* Get First Error Pointer */
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pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &dpc_status);
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first_error = (dpc_status & 0x1f00) >> 8;
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status &= ~mask;
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for (i = 0; i < ARRAY_SIZE(rp_pio_error_string); i++) {
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if (status & (1 << i))
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dev_err(dev, "[%2d] %s%s\n", i, rp_pio_error_string[i],
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first_error == i ? " (First)" : "");
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}
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if (dpc->rp_log_size < 4)
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return;
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG,
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&dw0);
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 4,
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&dw1);
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 8,
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&dw2);
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 12,
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&dw3);
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dev_err(dev, "TLP Header: %#010x %#010x %#010x %#010x\n",
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dw0, dw1, dw2, dw3);
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if (dpc->rp_log_size < 5)
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return;
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pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG, &log);
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dev_err(dev, "RP PIO ImpSpec Log %#010x\n", log);
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for (i = 0; i < dpc->rp_log_size - 5; i++) {
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pci_read_config_dword(pdev,
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cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, &prefix);
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dev_err(dev, "TLP Prefix Header: dw%d, %#010x\n", i, prefix);
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}
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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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struct device *dev = &dpc->dev->device;
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u16 cap = dpc->cap_pos, ctl, status, source, reason, ext_reason;
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pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl);
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if (!(ctl & PCI_EXP_DPC_CTL_INT_EN) || ctl == (u16)(~0))
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return IRQ_NONE;
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pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
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if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT))
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return IRQ_NONE;
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if (!(status & PCI_EXP_DPC_STATUS_TRIGGER)) {
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pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
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PCI_EXP_DPC_STATUS_INTERRUPT);
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return IRQ_HANDLED;
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}
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pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL,
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ctl & ~PCI_EXP_DPC_CTL_INT_EN);
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pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID,
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&source);
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dev_info(dev, "DPC containment event, status:%#06x source:%#06x\n",
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status, source);
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reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN) >> 1;
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ext_reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT) >> 5;
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dev_warn(dev, "DPC %s detected, 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" :
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(ext_reason == 0) ? "RP PIO error" :
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(ext_reason == 1) ? "software trigger" :
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"reserved error");
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/* show RP PIO error detail information */
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if (dpc->rp_extensions && reason == 3 && ext_reason == 0)
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dpc_process_rp_pio_error(dpc);
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schedule_work(&dpc->work);
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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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struct device *device = &dev->device;
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int status;
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u16 ctl, cap;
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if (pcie_aer_get_firmware_first(pdev))
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return -ENOTSUPP;
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dpc = devm_kzalloc(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, dpc_work);
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set_service_data(dev, dpc);
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status = devm_request_irq(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(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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dpc->rp_extensions = (cap & PCI_EXP_DPC_CAP_RP_EXT);
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if (dpc->rp_extensions) {
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dpc->rp_log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
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if (dpc->rp_log_size < 4 || dpc->rp_log_size > 9) {
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dev_err(device, "RP PIO log size %u is invalid\n",
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dpc->rp_log_size);
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dpc->rp_log_size = 0;
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}
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}
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ctl = (ctl & 0xfff4) | 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(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 & PCI_EXP_DPC_IRQ, 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), dpc->rp_log_size,
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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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device_initcall(dpc_service_init);
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