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Subject[PATCH v11 4/7] PCI/DPC: Unify and plumb error handling into DPC
Date
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 pcie_do_recovery.

Signed-off-by: Oza Pawandeep <poza@codeaurora.org>

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index abc514e..f8575da 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -343,6 +343,8 @@ static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
void pci_enable_acs(struct pci_dev *dev);

/* PCI error reporting and recovery */
+#define DPC_FATAL 4
+
void pcie_do_recovery(struct pci_dev *dev, int severity);

#ifdef CONFIG_PCIEASPM
diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c
index 38e40c6..5c01c63 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 +46,58 @@ struct dpc_dev {
"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 = (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 find_dpc_service_iter(struct device *device, void *data)
+{
+ struct pcie_port_service_driver *service_driver;
+ struct pcie_port_service_driver **drv =
+ (struct pcie_port_service_driver **) 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) {
+ *drv = service_driver;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+struct pcie_port_service_driver *pci_find_dpc_service(struct pci_dev *dev)
+{
+ struct pcie_port_service_driver *drv = NULL;
+
+ device_for_each_child(&dev->dev, &drv, find_dpc_service_iter);
+
+ return drv;
+}
+EXPORT_SYMBOL_GPL(pci_find_dpc_service);
+
static int dpc_wait_rp_inactive(struct dpc_dev *dpc)
{
unsigned long timeout = jiffies + HZ;
@@ -82,12 +135,25 @@ 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
+ * @dev: 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 +170,31 @@ 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);
+ 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 +373,7 @@ static void dpc_remove(struct pcie_device *dev)
.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/drivers/pci/pcie/pcie-err.c b/drivers/pci/pcie/pcie-err.c
index f830975..1ea4b9a 100644
--- a/drivers/pci/pcie/pcie-err.c
+++ b/drivers/pci/pcie/pcie-err.c
@@ -19,6 +19,7 @@
#include <linux/aer.h>
#include <linux/pcieport_if.h>
#include "portdrv.h"
+#include "./../pci.h"

static DEFINE_MUTEX(pci_err_recovery_lock);

@@ -181,7 +182,7 @@ 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;
@@ -195,9 +196,17 @@ static pci_ers_result_t reset_link(struct pci_dev *dev)
udev = dev->bus->self;
}

+
+ /* Use the service driver of the component firstly */
+#if IS_ENABLED(CONFIG_PCIE_DPC)
+ if (severity == DPC_FATAL)
+ driver = pci_find_dpc_service(udev);
+#endif
#if IS_ENABLED(CONFIG_PCIEAER)
- /* Use the aer driver of the component firstly */
- driver = pci_find_aer_service(udev);
+ if (severity == AER_FATAL ||
+ severity == AER_NONFATAL ||
+ severity == AER_CORRECTABLE)
+ driver = pci_find_aer_service(udev);
#endif

if (driver && driver->reset_link) {
@@ -287,7 +296,8 @@ void pcie_do_recovery(struct pci_dev *dev, int severity)

mutex_lock(&pci_err_recovery_lock);

- if (severity == AER_FATAL)
+ if (severity == AER_FATAL ||
+ severity == DPC_FATAL)
state = pci_channel_io_frozen;
else
state = pci_channel_io_normal;
@@ -297,10 +307,14 @@ 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;
+ else if (severity == DPC_FATAL)
+ goto resume;
+
}

if (status == PCI_ERS_RESULT_CAN_RECOVER)
@@ -324,6 +338,7 @@ void pcie_do_recovery(struct pci_dev *dev, int severity)
if (status != PCI_ERS_RESULT_RECOVERED)
goto failed;

+resume:
broadcast_error_message(dev,
state,
"resume",
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
index 4f1992d..b013e24 100644
--- a/drivers/pci/pcie/portdrv.h
+++ b/drivers/pci/pcie/portdrv.h
@@ -80,4 +80,5 @@ static inline void pcie_port_platform_notify(struct pci_dev *port, int *mask){}
#endif /* !CONFIG_ACPI */

struct pcie_port_service_driver *pci_find_aer_service(struct pci_dev *dev);
+struct pcie_port_service_driver *pci_find_dpc_service(struct pci_dev *dev);
#endif /* _PORTDRV_H_ */
--
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.,
a Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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