diff mbox

[v1] PCI/DPC: Rename from pcie-dpc.c to dpc.c.

Message ID 152253566671.104119.5361437405172766528.stgit@bhelgaas-glaptop.roam.corp.google.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Bjorn Helgaas March 31, 2018, 10:34 p.m. UTC
From: Bjorn Helgaas <bhelgaas@google.com>

Rename from 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>
---
 drivers/pci/pcie/Makefile   |    2 
 drivers/pci/pcie/dpc.c      |  306 +++++++++++++++++++++++++++++++++++++++++++
 drivers/pci/pcie/pcie-dpc.c |  306 -------------------------------------------
 3 files changed, 307 insertions(+), 307 deletions(-)
 create mode 100644 drivers/pci/pcie/dpc.c
 delete mode 100644 drivers/pci/pcie/pcie-dpc.c

Comments

Sinan Kaya March 31, 2018, 11:28 p.m. UTC | #1
On 2018-03-31 18:34, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
> 
> Rename from pcie-dpc.c to dpc.c.  The path 
> "drivers/pci/pcie/pcie-dpc.c"
> has more occurrences of "pci" than necessary.
> 

Makes perfect sense.

> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> ---
>  drivers/pci/pcie/Makefile   |    2
>  drivers/pci/pcie/dpc.c      |  306 
> +++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/pcie/pcie-dpc.c |  306 
> -------------------------------------------
>  3 files changed, 307 insertions(+), 307 deletions(-)
>  create mode 100644 drivers/pci/pcie/dpc.c
>  delete mode 100644 drivers/pci/pcie/pcie-dpc.c
> 
> diff --git a/drivers/pci/pcie/Makefile b/drivers/pci/pcie/Makefile
> index 223e4c34c29a..88d49500e134 100644
> --- a/drivers/pci/pcie/Makefile
> +++ b/drivers/pci/pcie/Makefile
> @@ -16,5 +16,5 @@ obj-$(CONFIG_PCIEAER)		+= aer/
> 
>  obj-$(CONFIG_PCIE_PME) += pme.o
> 
> -obj-$(CONFIG_PCIE_DPC) += pcie-dpc.o
> +obj-$(CONFIG_PCIE_DPC) += dpc.o
>  obj-$(CONFIG_PCIE_PTM) += ptm.o
> diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
> new file mode 100644
> index 000000000000..38e40c6c576f
> --- /dev/null
> +++ b/drivers/pci/pcie/dpc.c
> @@ -0,0 +1,306 @@
> +// 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 <linux/pcieport_if.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);
> diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c
> deleted file mode 100644
> index 38e40c6c576f..000000000000
> --- a/drivers/pci/pcie/pcie-dpc.c
> +++ /dev/null
> @@ -1,306 +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 <linux/pcieport_if.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);
Keith Busch April 2, 2018, 2:23 p.m. UTC | #2
On Sat, Mar 31, 2018 at 05:34:26PM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
> 
> Rename from 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>

Looks good.

Acked-by: Keith Busch <keith.busch@intel.com>
diff mbox

Patch

diff --git a/drivers/pci/pcie/Makefile b/drivers/pci/pcie/Makefile
index 223e4c34c29a..88d49500e134 100644
--- a/drivers/pci/pcie/Makefile
+++ b/drivers/pci/pcie/Makefile
@@ -16,5 +16,5 @@  obj-$(CONFIG_PCIEAER)		+= aer/
 
 obj-$(CONFIG_PCIE_PME) += pme.o
 
-obj-$(CONFIG_PCIE_DPC) += pcie-dpc.o
+obj-$(CONFIG_PCIE_DPC) += dpc.o
 obj-$(CONFIG_PCIE_PTM) += ptm.o
diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
new file mode 100644
index 000000000000..38e40c6c576f
--- /dev/null
+++ b/drivers/pci/pcie/dpc.c
@@ -0,0 +1,306 @@ 
+// 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 <linux/pcieport_if.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);
diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c
deleted file mode 100644
index 38e40c6c576f..000000000000
--- a/drivers/pci/pcie/pcie-dpc.c
+++ /dev/null
@@ -1,306 +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 <linux/pcieport_if.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);