Commit 3972b0e2 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Bjorn Helgaas
Browse files

Merge branch 'pci/dpc' into next 

* pci/dpc:
  PCI/DPC: Reformat DPC register definitions
  PCI/DPC: Add and use DPC Status register field definitions
  PCI/DPC: Squash dpc_rp_pio_get_info() into dpc_process_rp_pio_error()
  PCI/DPC: Remove unnecessary RP PIO register structs
  PCI/DPC: Push dpc->rp_pio_status assignment into dpc_rp_pio_get_info()
  PCI/DPC: Squash dpc_rp_pio_print_error() into dpc_rp_pio_get_info()
  PCI/DPC: Make RP PIO log size check more generic
  PCI/DPC: Rename local "status" to "dpc_status"
  PCI/DPC: Squash dpc_rp_pio_print_tlp_header() into dpc_rp_pio_print_error()
  PCI/DPC: Process RP PIO details only if RP PIO extensions supported
  PCI/DPC: Read RP PIO Log Size once at probe
  PCI/DPC: Rename struct dpc_dev.rp to rp_extensions
  PCI/DPC: Add local variable for DPC capability offset
  PCI/DPC: Rename interrupt_event_handler() to dpc_work()
  PCI/DPC: Fix interrupt message number print
  PCI/DPC: Enable DPC only if AER is available
  PCI/DPC: Fix shared interrupt handling
parents ac7ab8a6 65d5e913

drivers/pci/pcie/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -92,7 +92,7 @@ config PCIE_PME 


config PCIE_DPC

	bool "PCIe Downstream Port Containment support"

	depends on PCIEPORTBUS

	depends on PCIEPORTBUS && PCIEAER

	default n

	help

	  This enables PCI Express Downstream Port Containment (DPC)

drivers/pci/pcie/pcie-dpc.c

+106 −145
Original line number Diff line number Diff line
@@ -15,34 +15,15 @@ 
#include <linux/pci.h>

#include <linux/pcieport_if.h>

#include "../pci.h"



struct rp_pio_header_log_regs {

	u32 dw0;

	u32 dw1;

	u32 dw2;

	u32 dw3;

};



struct dpc_rp_pio_regs {

	u32 status;

	u32 mask;

	u32 severity;

	u32 syserror;

	u32 exception;



	struct rp_pio_header_log_regs header_log;

	u32 impspec_log;

	u32 tlp_prefix_log[4];

	u32 log_size;

	u16 first_error;

};

#include "aer/aerdrv.h"



struct dpc_dev {

	struct pcie_device	*dev;

	struct work_struct	work;

	int			cap_pos;

	bool			rp;

	u16			cap_pos;

	bool			rp_extensions;

	u32			rp_pio_status;

	u8			rp_log_size;

};



static const char * const rp_pio_error_string[] = {
@@ -72,13 +53,13 @@ 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 status;

	u16 cap = dpc->cap_pos, status;



	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &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, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status);

		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");
@@ -104,11 +85,12 @@ static void dpc_wait_link_inactive(struct dpc_dev *dpc) 
		dev_warn(dev, "Link state not disabled for DPC event\n");

}



static void interrupt_event_handler(struct work_struct *work)

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,
@@ -124,145 +106,113 @@ static void interrupt_event_handler(struct work_struct *work) 
	pci_unlock_rescan_remove();



	dpc_wait_link_inactive(dpc);

	if (dpc->rp && dpc_wait_rp_inactive(dpc))

	if (dpc->rp_extensions && dpc_wait_rp_inactive(dpc))

		return;

	if (dpc->rp && dpc->rp_pio_status) {

		pci_write_config_dword(pdev,

				      dpc->cap_pos + PCI_EXP_DPC_RP_PIO_STATUS,

	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, dpc->cap_pos + PCI_EXP_DPC_STATUS,

	pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,

		PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT);

}



static void dpc_rp_pio_print_tlp_header(struct device *dev,

					struct rp_pio_header_log_regs *t)

{

	dev_err(dev, "TLP Header: %#010x %#010x %#010x %#010x\n",

		t->dw0, t->dw1, t->dw2, t->dw3);

	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_rp_pio_print_error(struct dpc_dev *dpc,

				   struct dpc_rp_pio_regs *rp_pio)

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;

	u32 status;



	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",

		rp_pio->status, rp_pio->mask);

		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",

		rp_pio->severity, rp_pio->syserror, rp_pio->exception);

		sev, syserr, exc);



	status = (rp_pio->status & ~rp_pio->mask);

	/* 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)))

			continue;



		if (status & (1 << i))

			dev_err(dev, "[%2d] %s%s\n", i, rp_pio_error_string[i],

			rp_pio->first_error == i ? " (First)" : "");

				first_error == i ? " (First)" : "");

	}



	dpc_rp_pio_print_tlp_header(dev, &rp_pio->header_log);

	if (rp_pio->log_size == 4)

	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;

	dev_err(dev, "RP PIO ImpSpec Log %#010x\n", rp_pio->impspec_log);

	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 < rp_pio->log_size - 5; i++)

		dev_err(dev, "TLP Prefix Header: dw%d, %#010x\n", i,

			rp_pio->tlp_prefix_log[i]);

	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 void dpc_rp_pio_get_info(struct dpc_dev *dpc,

				struct dpc_rp_pio_regs *rp_pio)

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;

	int i;

	u16 cap;

	u16 status;



	pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_STATUS,

			      &rp_pio->status);

	pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_MASK,

			      &rp_pio->mask);



	pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_SEVERITY,

			      &rp_pio->severity);

	pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_SYSERROR,

			      &rp_pio->syserror);

	pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_EXCEPTION,

			      &rp_pio->exception);



	/* Get First Error Pointer */

	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status);

	rp_pio->first_error = (status & 0x1f00) >> 8;



	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap);

	rp_pio->log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;

	if (rp_pio->log_size < 4 || rp_pio->log_size > 9) {

		dev_err(dev, "RP PIO log size %u is invalid\n",

			rp_pio->log_size);

		return;

	}

	u16 cap = dpc->cap_pos, ctl, status, source, reason, ext_reason;



	pci_read_config_dword(pdev,

			      dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG,

			      &rp_pio->header_log.dw0);

	pci_read_config_dword(pdev,

			      dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 4,

			      &rp_pio->header_log.dw1);

	pci_read_config_dword(pdev,

			      dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 8,

			      &rp_pio->header_log.dw2);

	pci_read_config_dword(pdev,

			      dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 12,

			      &rp_pio->header_log.dw3);

	if (rp_pio->log_size == 4)

		return;

	pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl);



	pci_read_config_dword(pdev,

			      dpc->cap_pos + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG,

			      &rp_pio->impspec_log);

	for (i = 0; i < rp_pio->log_size - 5; i++)

		pci_read_config_dword(pdev,

			dpc->cap_pos + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG,

			&rp_pio->tlp_prefix_log[i]);

}

	if (!(ctl & PCI_EXP_DPC_CTL_INT_EN) || ctl == (u16)(~0))

		return IRQ_NONE;



static void dpc_process_rp_pio_error(struct dpc_dev *dpc)

{

	struct dpc_rp_pio_regs rp_pio_regs;

	pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);



	dpc_rp_pio_get_info(dpc, &rp_pio_regs);

	dpc_rp_pio_print_error(dpc, &rp_pio_regs);

	if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT))

		return IRQ_NONE;



	dpc->rp_pio_status = rp_pio_regs.status;

	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;

	}



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 status, source;

	pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL,

			      ctl & ~PCI_EXP_DPC_CTL_INT_EN);



	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status);

	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_SOURCE_ID,

	pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID,

			     &source);

	if (!status || status == (u16)(~0))

		return IRQ_NONE;



	dev_info(dev, "DPC containment event, status:%#06x source:%#06x\n",

		status, source);



	if (status & PCI_EXP_DPC_STATUS_TRIGGER) {

		u16 reason = (status >> 1) & 0x3;

		u16 ext_reason = (status >> 5) & 0x3;

	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" :
@@ -272,11 +222,11 @@ static irqreturn_t dpc_irq(int irq, void *context) 
		 (ext_reason == 1) ? "software trigger" :

				     "reserved error");

	/* show RP PIO error detail information */

		if (reason == 3 && ext_reason == 0)

	if (dpc->rp_extensions && reason == 3 && ext_reason == 0)

		dpc_process_rp_pio_error(dpc);



	schedule_work(&dpc->work);

	}



	return IRQ_HANDLED;

}
@@ -289,13 +239,16 @@ static int dpc_probe(struct pcie_device *dev) 
	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, interrupt_event_handler);

	INIT_WORK(&dpc->work, dpc_work);

	set_service_data(dev, dpc);



	status = devm_request_irq(device, dev->irq, dpc_irq, IRQF_SHARED,
@@ -309,15 +262,23 @@ static int dpc_probe(struct pcie_device *dev) 
	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 = (cap & PCI_EXP_DPC_CAP_RP_EXT);

	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 & 0xf, FLAG(cap, PCI_EXP_DPC_CAP_RP_EXT),

		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), (cap >> 8) & 0xf,

		FLAG(cap, PCI_EXP_DPC_CAP_SW_TRIGGER), dpc->rp_log_size,

		FLAG(cap, PCI_EXP_DPC_CAP_DL_ACTIVE));

	return status;

}

drivers/pci/pcie/portdrv_core.c

+2 −2
Original line number Diff line number Diff line
@@ -216,9 +216,9 @@ static int get_port_device_capability(struct pci_dev *dev) 
		return 0;



	cap_mask = PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP

			| PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_DPC;

			| PCIE_PORT_SERVICE_VC;

	if (pci_aer_available())

		cap_mask |= PCIE_PORT_SERVICE_AER;

		cap_mask |= PCIE_PORT_SERVICE_AER | PCIE_PORT_SERVICE_DPC;



	if (pcie_ports_auto)

		pcie_port_platform_notify(dev, &cap_mask);

include/uapi/linux/pci_regs.h

+13 −11
Original line number Diff line number Diff line
@@ -966,26 +966,28 @@ 


/* Downstream Port Containment */

#define PCI_EXP_DPC_CAP			4	/* DPC Capability */

#define PCI_EXP_DPC_IRQ			0x1f	/* DPC Interrupt Message Number */

#define  PCI_EXP_DPC_CAP_RP_EXT		0x20	/* Root Port Extensions for DPC */

#define  PCI_EXP_DPC_CAP_POISONED_TLP	0x40	/* Poisoned TLP Egress Blocking Supported */

#define  PCI_EXP_DPC_CAP_SW_TRIGGER	0x80	/* Software Triggering Supported */

#define  PCI_EXP_DPC_RP_PIO_LOG_SIZE	0xF00	/* RP PIO log size */

#define PCI_EXP_DPC_IRQ			0x001F	/* Interrupt Message Number */

#define  PCI_EXP_DPC_CAP_RP_EXT		0x0020	/* Root Port Extensions */

#define  PCI_EXP_DPC_CAP_POISONED_TLP	0x0040	/* Poisoned TLP Egress Blocking Supported */

#define  PCI_EXP_DPC_CAP_SW_TRIGGER	0x0080	/* Software Triggering Supported */

#define  PCI_EXP_DPC_RP_PIO_LOG_SIZE	0x0F00	/* RP PIO Log Size */

#define  PCI_EXP_DPC_CAP_DL_ACTIVE	0x1000	/* ERR_COR signal on DL_Active supported */



#define PCI_EXP_DPC_CTL			6	/* DPC control */

#define  PCI_EXP_DPC_CTL_EN_NONFATAL 	0x02	/* Enable trigger on ERR_NONFATAL message */

#define  PCI_EXP_DPC_CTL_INT_EN 	0x08	/* DPC Interrupt Enable */

#define  PCI_EXP_DPC_CTL_EN_NONFATAL 	0x0002	/* Enable trigger on ERR_NONFATAL message */

#define  PCI_EXP_DPC_CTL_INT_EN 	0x0008	/* DPC Interrupt Enable */



#define PCI_EXP_DPC_STATUS		8	/* DPC Status */

#define  PCI_EXP_DPC_STATUS_TRIGGER	0x01	/* Trigger Status */

#define  PCI_EXP_DPC_STATUS_INTERRUPT	0x08	/* Interrupt Status */

#define  PCI_EXP_DPC_RP_BUSY		0x10	/* Root Port Busy */

#define  PCI_EXP_DPC_STATUS_TRIGGER	    0x0001 /* Trigger Status */

#define  PCI_EXP_DPC_STATUS_TRIGGER_RSN	    0x0006 /* Trigger Reason */

#define  PCI_EXP_DPC_STATUS_INTERRUPT	    0x0008 /* Interrupt Status */

#define  PCI_EXP_DPC_RP_BUSY		    0x0010 /* Root Port Busy */

#define  PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT 0x0060 /* Trig Reason Extension */



#define PCI_EXP_DPC_SOURCE_ID		10	/* DPC Source Identifier */



#define PCI_EXP_DPC_RP_PIO_STATUS	 0x0C	/* RP PIO Status */

#define PCI_EXP_DPC_RP_PIO_MASK		 0x10	/* RP PIO MASK */

#define PCI_EXP_DPC_RP_PIO_MASK		 0x10	/* RP PIO Mask */

#define PCI_EXP_DPC_RP_PIO_SEVERITY	 0x14	/* RP PIO Severity */

#define PCI_EXP_DPC_RP_PIO_SYSERROR	 0x18	/* RP PIO SysError */

#define PCI_EXP_DPC_RP_PIO_EXCEPTION	 0x1C	/* RP PIO Exception */

CRA Git | Maintained and supported by SUSTech CRA and CCSE