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Message-ID: <152253566671.104119.5361437405172766528.stgit@bhelgaas-glaptop.roam.corp.google.com>
Date: Sat, 31 Mar 2018 17:34:26 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: linux-pci@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
Sinan Kaya <okaya@...eaurora.org>,
Oza Pawandeep <poza@...eaurora.org>
Subject: [PATCH v1] PCI/DPC: Rename from pcie-dpc.c to dpc.c.
From: Bjorn Helgaas <bhelgaas@...gle.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@...gle.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@...el.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@...el.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);
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