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Message-Id: <1523284914-2037-5-git-send-email-poza@codeaurora.org>
Date: Mon, 9 Apr 2018 10:41:52 -0400
From: Oza Pawandeep <poza@...eaurora.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
Philippe Ombredanne <pombredanne@...b.com>,
Thomas Gleixner <tglx@...utronix.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kate Stewart <kstewart@...uxfoundation.org>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
Dongdong Liu <liudongdong3@...wei.com>,
Keith Busch <keith.busch@...el.com>, Wei Zhang <wzhang@...com>,
Sinan Kaya <okaya@...eaurora.org>,
Timur Tabi <timur@...eaurora.org>
Cc: Oza Pawandeep <poza@...eaurora.org>
Subject: [PATCH v13 4/6] PCI/DPC: Unify and plumb error handling into DPC
Current DPC driver does not do recovery, e.g. calling end-point's driver's
callbacks, which sanitize the sw.
DPC driver implements link_reset callback, and calls pci_do_recovery().
Signed-off-by: Oza Pawandeep <poza@...eaurora.org>
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 98aeec4..d02e029 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -19,6 +19,7 @@
#include <linux/aer.h>
#include <linux/pcieport_if.h>
#include "portdrv.h"
+#include "./../pci.h"
struct aer_broadcast_data {
enum pci_channel_state state;
@@ -179,11 +180,12 @@ static pci_ers_result_t default_reset_link(struct pci_dev *dev)
return PCI_ERS_RESULT_RECOVERED;
}
-static pci_ers_result_t reset_link(struct pci_dev *dev)
+static pci_ers_result_t reset_link(struct pci_dev *dev, int severity)
{
struct pci_dev *udev;
pci_ers_result_t status;
struct pcie_port_service_driver *driver = NULL;
+ u32 service;
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
/* Reset this port for all subordinates */
@@ -193,8 +195,12 @@ static pci_ers_result_t reset_link(struct pci_dev *dev)
udev = dev->bus->self;
}
- /* Use the aer driver of the component firstly */
- driver = pcie_port_find_service(udev, PCIE_PORT_SERVICE_AER);
+ if (severity == DPC_FATAL)
+ service = PCIE_PORT_SERVICE_DPC;
+ else
+ service = PCIE_PORT_SERVICE_AER;
+
+ driver = pcie_port_find_service(udev, service);
if (driver && driver->reset_link) {
status = driver->reset_link(udev);
@@ -281,7 +287,8 @@ void pcie_do_recovery(struct pci_dev *dev, int severity)
pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
enum pci_channel_state state;
- if (severity == AER_FATAL)
+ if ((severity == AER_FATAL) ||
+ (severity == DPC_FATAL))
state = pci_channel_io_frozen;
else
state = pci_channel_io_normal;
@@ -291,8 +298,9 @@ void pcie_do_recovery(struct pci_dev *dev, int severity)
"error_detected",
report_error_detected);
- if (severity == AER_FATAL) {
- result = reset_link(dev);
+ if ((severity == AER_FATAL) ||
+ (severity == DPC_FATAL)) {
+ result = reset_link(dev, severity);
if (result != PCI_ERS_RESULT_RECOVERED)
goto failed;
}
diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c
index 38e40c6..517c8b4 100644
--- a/drivers/pci/pcie/pcie-dpc.c
+++ b/drivers/pci/pcie/pcie-dpc.c
@@ -13,6 +13,7 @@
#include <linux/pcieport_if.h>
#include "../pci.h"
#include "aer/aerdrv.h"
+#include "portdrv.h"
struct dpc_dev {
struct pcie_device *dev;
@@ -45,6 +46,33 @@ static const char * const rp_pio_error_string[] = {
"Memory Request Completion Timeout", /* Bit Position 18 */
};
+static int find_dpc_dev_iter(struct device *device, void *data)
+{
+ struct pcie_port_service_driver *service_driver;
+ struct device **dev;
+
+ dev = (struct device **) data;
+
+ if (device->bus == &pcie_port_bus_type && device->driver) {
+ service_driver = to_service_driver(device->driver);
+ if (service_driver->service == PCIE_PORT_SERVICE_DPC) {
+ *dev = device;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static struct device *pci_find_dpc_dev(struct pci_dev *pdev)
+{
+ struct device *dev = NULL;
+
+ device_for_each_child(&pdev->dev, &dev, find_dpc_dev_iter);
+
+ return dev;
+}
+
static int dpc_wait_rp_inactive(struct dpc_dev *dpc)
{
unsigned long timeout = jiffies + HZ;
@@ -82,12 +110,25 @@ static void dpc_wait_link_inactive(struct dpc_dev *dpc)
dev_warn(dev, "Link state not disabled for DPC event\n");
}
-static void dpc_work(struct work_struct *work)
+/**
+ * dpc_reset_link - reset link DPC routine
+ * @pdev: pointer to Root Port's pci_dev data structure
+ *
+ * Invoked by Port Bus driver when performing link reset at Root Port.
+ */
+static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev)
{
- 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;
+ struct pci_dev *dev, *temp;
+ struct dpc_dev *dpc;
+ struct pcie_device *pciedev;
+ struct device *devdpc;
+ u16 cap, ctl;
+
+ devdpc = pci_find_dpc_dev(pdev);
+ pciedev = to_pcie_device(devdpc);
+ dpc = get_service_data(pciedev);
+ cap = dpc->cap_pos;
pci_lock_rescan_remove();
list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
@@ -104,21 +145,31 @@ static void dpc_work(struct work_struct *work)
dpc_wait_link_inactive(dpc);
if (dpc->rp_extensions && dpc_wait_rp_inactive(dpc))
- return;
+ return PCI_ERS_RESULT_DISCONNECT;
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_write_config_word(pdev, dpc->cap_pos + 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);
+
+ return PCI_ERS_RESULT_RECOVERED;
}
+static void dpc_work(struct work_struct *work)
+{
+ struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
+ struct pci_dev *pdev = dpc->dev->port;
+
+ /* From DPC point of view error is always FATAL. */
+ pcie_do_recovery(pdev, DPC_FATAL);
+}
static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
{
struct device *dev = &dpc->dev->device;
@@ -297,6 +348,7 @@ static struct pcie_port_service_driver dpcdriver = {
.service = PCIE_PORT_SERVICE_DPC,
.probe = dpc_probe,
.remove = dpc_remove,
+ .reset_link = dpc_reset_link,
};
static int __init dpc_service_init(void)
diff --git a/include/linux/aer.h b/include/linux/aer.h
index 8f87bbe..9cfd0b8 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -15,6 +15,8 @@
#define AER_FATAL 1
#define AER_CORRECTABLE 2
+#define DPC_FATAL 4
+
struct pci_dev;
struct aer_header_log_regs {
--
2.7.4
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