PCI/DPC: Rename from pcie-dpc.c to dpc.c

Rename pcie-dpc.c to dpc.c.  The path "drivers/pci/pcie/pcie-dpc.c" has
more occurrences of "pci" than necessary.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 0 insertions, 307 deletions

diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c
deleted file mode 100644
index 8c57d607e603..000000000000
--- a/drivers/pci/pcie/pcie-dpc.c
+++ /dev/null
@@ -1,307 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * PCI Express Downstream Port Containment services driver
- * Author: Keith Busch <keith.busch@intel.com>
- *
- * Copyright (C) 2016 Intel Corp.
- */
-
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-
-#include "portdrv.h"
-#include "../pci.h"
-#include "aer/aerdrv.h"
-
-struct dpc_dev {
-	struct pcie_device	*dev;
-	struct work_struct	work;
-	u16			cap_pos;
-	bool			rp_extensions;
-	u32			rp_pio_status;
-	u8			rp_log_size;
-};
-
-static const char * const rp_pio_error_string[] = {
-	"Configuration Request received UR Completion",	 /* Bit Position 0  */
-	"Configuration Request received CA Completion",	 /* Bit Position 1  */
-	"Configuration Request Completion Timeout",	 /* Bit Position 2  */
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	"I/O Request received UR Completion",		 /* Bit Position 8  */
-	"I/O Request received CA Completion",		 /* Bit Position 9  */
-	"I/O Request Completion Timeout",		 /* Bit Position 10 */
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	"Memory Request received UR Completion",	 /* Bit Position 16 */
-	"Memory Request received CA Completion",	 /* Bit Position 17 */
-	"Memory Request Completion Timeout",		 /* Bit Position 18 */
-};
-
-static int dpc_wait_rp_inactive(struct dpc_dev *dpc)
-{
-	unsigned long timeout = jiffies + HZ;
-	struct pci_dev *pdev = dpc->dev->port;
-	struct device *dev = &dpc->dev->device;
-	u16 cap = dpc->cap_pos, status;
-
-	pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
-	while (status & PCI_EXP_DPC_RP_BUSY &&
-					!time_after(jiffies, timeout)) {
-		msleep(10);
-		pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
-	}
-	if (status & PCI_EXP_DPC_RP_BUSY) {
-		dev_warn(dev, "DPC root port still busy\n");
-		return -EBUSY;
-	}
-	return 0;
-}
-
-static void dpc_wait_link_inactive(struct dpc_dev *dpc)
-{
-	unsigned long timeout = jiffies + HZ;
-	struct pci_dev *pdev = dpc->dev->port;
-	struct device *dev = &dpc->dev->device;
-	u16 lnk_status;
-
-	pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
-	while (lnk_status & PCI_EXP_LNKSTA_DLLLA &&
-					!time_after(jiffies, timeout)) {
-		msleep(10);
-		pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
-	}
-	if (lnk_status & PCI_EXP_LNKSTA_DLLLA)
-		dev_warn(dev, "Link state not disabled for DPC event\n");
-}
-
-static void dpc_work(struct work_struct *work)
-{
-	struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
-	struct pci_dev *dev, *temp, *pdev = dpc->dev->port;
-	struct pci_bus *parent = pdev->subordinate;
-	u16 cap = dpc->cap_pos, ctl;
-
-	pci_lock_rescan_remove();
-	list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
-					 bus_list) {
-		pci_dev_get(dev);
-		pci_dev_set_disconnected(dev, NULL);
-		if (pci_has_subordinate(dev))
-			pci_walk_bus(dev->subordinate,
-				     pci_dev_set_disconnected, NULL);
-		pci_stop_and_remove_bus_device(dev);
-		pci_dev_put(dev);
-	}
-	pci_unlock_rescan_remove();
-
-	dpc_wait_link_inactive(dpc);
-	if (dpc->rp_extensions && dpc_wait_rp_inactive(dpc))
-		return;
-	if (dpc->rp_extensions && dpc->rp_pio_status) {
-		pci_write_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS,
-				       dpc->rp_pio_status);
-		dpc->rp_pio_status = 0;
-	}
-
-	pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
-		PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT);
-
-	pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl);
-	pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL,
-			      ctl | PCI_EXP_DPC_CTL_INT_EN);
-}
-
-static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
-{
-	struct device *dev = &dpc->dev->device;
-	struct pci_dev *pdev = dpc->dev->port;
-	u16 cap = dpc->cap_pos, dpc_status, first_error;
-	u32 status, mask, sev, syserr, exc, dw0, dw1, dw2, dw3, log, prefix;
-	int i;
-
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS, &status);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_MASK, &mask);
-	dev_err(dev, "rp_pio_status: %#010x, rp_pio_mask: %#010x\n",
-		status, mask);
-
-	dpc->rp_pio_status = status;
-
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SEVERITY, &sev);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SYSERROR, &syserr);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_EXCEPTION, &exc);
-	dev_err(dev, "RP PIO severity=%#010x, syserror=%#010x, exception=%#010x\n",
-		sev, syserr, exc);
-
-	/* Get First Error Pointer */
-	pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &dpc_status);
-	first_error = (dpc_status & 0x1f00) >> 8;
-
-	status &= ~mask;
-	for (i = 0; i < ARRAY_SIZE(rp_pio_error_string); i++) {
-		if (status & (1 << i))
-			dev_err(dev, "[%2d] %s%s\n", i, rp_pio_error_string[i],
-				first_error == i ? " (First)" : "");
-	}
-
-	if (dpc->rp_log_size < 4)
-		return;
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG,
-			      &dw0);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 4,
-			      &dw1);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 8,
-			      &dw2);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 12,
-			      &dw3);
-	dev_err(dev, "TLP Header: %#010x %#010x %#010x %#010x\n",
-		dw0, dw1, dw2, dw3);
-
-	if (dpc->rp_log_size < 5)
-		return;
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG, &log);
-	dev_err(dev, "RP PIO ImpSpec Log %#010x\n", log);
-
-	for (i = 0; i < dpc->rp_log_size - 5; i++) {
-		pci_read_config_dword(pdev,
-			cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, &prefix);
-		dev_err(dev, "TLP Prefix Header: dw%d, %#010x\n", i, prefix);
-	}
-}
-
-static irqreturn_t dpc_irq(int irq, void *context)
-{
-	struct dpc_dev *dpc = (struct dpc_dev *)context;
-	struct pci_dev *pdev = dpc->dev->port;
-	struct device *dev = &dpc->dev->device;
-	u16 cap = dpc->cap_pos, ctl, status, source, reason, ext_reason;
-
-	pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl);
-
-	if (!(ctl & PCI_EXP_DPC_CTL_INT_EN) || ctl == (u16)(~0))
-		return IRQ_NONE;
-
-	pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
-
-	if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT))
-		return IRQ_NONE;
-
-	if (!(status & PCI_EXP_DPC_STATUS_TRIGGER)) {
-		pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
-				      PCI_EXP_DPC_STATUS_INTERRUPT);
-		return IRQ_HANDLED;
-	}
-
-	pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL,
-			      ctl & ~PCI_EXP_DPC_CTL_INT_EN);
-
-	pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID,
-			     &source);
-
-	dev_info(dev, "DPC containment event, status:%#06x source:%#06x\n",
-		status, source);
-
-	reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN) >> 1;
-	ext_reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT) >> 5;
-
-	dev_warn(dev, "DPC %s detected, remove downstream devices\n",
-		 (reason == 0) ? "unmasked uncorrectable error" :
-		 (reason == 1) ? "ERR_NONFATAL" :
-		 (reason == 2) ? "ERR_FATAL" :
-		 (ext_reason == 0) ? "RP PIO error" :
-		 (ext_reason == 1) ? "software trigger" :
-				     "reserved error");
-	/* show RP PIO error detail information */
-	if (dpc->rp_extensions && reason == 3 && ext_reason == 0)
-		dpc_process_rp_pio_error(dpc);
-
-	schedule_work(&dpc->work);
-
-	return IRQ_HANDLED;
-}
-
-#define FLAG(x, y) (((x) & (y)) ? '+' : '-')
-static int dpc_probe(struct pcie_device *dev)
-{
-	struct dpc_dev *dpc;
-	struct pci_dev *pdev = dev->port;
-	struct device *device = &dev->device;
-	int status;
-	u16 ctl, cap;
-
-	if (pcie_aer_get_firmware_first(pdev))
-		return -ENOTSUPP;
-
-	dpc = devm_kzalloc(device, sizeof(*dpc), GFP_KERNEL);
-	if (!dpc)
-		return -ENOMEM;
-
-	dpc->cap_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC);
-	dpc->dev = dev;
-	INIT_WORK(&dpc->work, dpc_work);
-	set_service_data(dev, dpc);
-
-	status = devm_request_irq(device, dev->irq, dpc_irq, IRQF_SHARED,
-				  "pcie-dpc", dpc);
-	if (status) {
-		dev_warn(device, "request IRQ%d failed: %d\n", dev->irq,
-			 status);
-		return status;
-	}
-
-	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap);
-	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
-
-	dpc->rp_extensions = (cap & PCI_EXP_DPC_CAP_RP_EXT);
-	if (dpc->rp_extensions) {
-		dpc->rp_log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
-		if (dpc->rp_log_size < 4 || dpc->rp_log_size > 9) {
-			dev_err(device, "RP PIO log size %u is invalid\n",
-				dpc->rp_log_size);
-			dpc->rp_log_size = 0;
-		}
-	}
-
-	ctl = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_NONFATAL | PCI_EXP_DPC_CTL_INT_EN;
-	pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl);
-
-	dev_info(device, "DPC error containment capabilities: Int Msg #%d, RPExt%c PoisonedTLP%c SwTrigger%c RP PIO Log %d, DL_ActiveErr%c\n",
-		cap & PCI_EXP_DPC_IRQ, FLAG(cap, PCI_EXP_DPC_CAP_RP_EXT),
-		FLAG(cap, PCI_EXP_DPC_CAP_POISONED_TLP),
-		FLAG(cap, PCI_EXP_DPC_CAP_SW_TRIGGER), dpc->rp_log_size,
-		FLAG(cap, PCI_EXP_DPC_CAP_DL_ACTIVE));
-	return status;
-}
-
-static void dpc_remove(struct pcie_device *dev)
-{
-	struct dpc_dev *dpc = get_service_data(dev);
-	struct pci_dev *pdev = dev->port;
-	u16 ctl;
-
-	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
-	ctl &= ~(PCI_EXP_DPC_CTL_EN_NONFATAL | PCI_EXP_DPC_CTL_INT_EN);
-	pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl);
-}
-
-static struct pcie_port_service_driver dpcdriver = {
-	.name		= "dpc",
-	.port_type	= PCIE_ANY_PORT,
-	.service	= PCIE_PORT_SERVICE_DPC,
-	.probe		= dpc_probe,
-	.remove		= dpc_remove,
-};
-
-static int __init dpc_service_init(void)
-{
-	return pcie_port_service_register(&dpcdriver);
-}
-device_initcall(dpc_service_init);