#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include "adf_accel_devices.h"
#include "adf_common_drv.h"
#include "adf_pfvf_pf_msg.h"
struct adf_fatal_error_data {
struct adf_accel_dev *accel_dev;
struct work_struct work;
};
static struct workqueue_struct *device_reset_wq;
static struct workqueue_struct *device_sriov_wq;
static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
pci_channel_state_t state)
{
struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
if (!accel_dev) {
dev_err(&pdev->dev, "Can't find acceleration device\n");
return PCI_ERS_RESULT_DISCONNECT;
}
if (state == pci_channel_io_perm_failure) {
dev_err(&pdev->dev, "Can't recover from device error\n");
return PCI_ERS_RESULT_DISCONNECT;
}
set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
if (accel_dev->hw_device->exit_arb) {
dev_dbg(&pdev->dev, "Disabling arbitration\n");
accel_dev->hw_device->exit_arb(accel_dev);
}
adf_error_notifier(accel_dev);
adf_pf2vf_notify_fatal_error(accel_dev);
adf_dev_restarting_notify(accel_dev);
pci_clear_master(pdev);
adf_dev_down(accel_dev);
return PCI_ERS_RESULT_NEED_RESET;
}
struct adf_reset_dev_data {
int mode;
struct adf_accel_dev *accel_dev;
struct completion compl;
struct work_struct reset_work;
};
struct adf_sriov_dev_data {
struct adf_accel_dev *accel_dev;
struct completion compl;
struct work_struct sriov_work;
};
void adf_reset_sbr(struct adf_accel_dev *accel_dev)
{
struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
struct pci_dev *parent = pdev->bus->self;
u16 bridge_ctl = 0;
if (!parent)
parent = pdev;
if (!pci_wait_for_pending_transaction(pdev))
dev_info(&GET_DEV(accel_dev),
"Transaction still in progress. Proceeding\n");
dev_info(&GET_DEV(accel_dev), "Secondary bus reset\n");
pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
msleep(100);
bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
msleep(100);
}
EXPORT_SYMBOL_GPL(adf_reset_sbr);
void adf_reset_flr(struct adf_accel_dev *accel_dev)
{
pcie_flr(accel_to_pci_dev(accel_dev));
}
EXPORT_SYMBOL_GPL(adf_reset_flr);
void adf_dev_restore(struct adf_accel_dev *accel_dev)
{
struct adf_hw_device_data *hw_device = accel_dev->hw_device;
struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
if (hw_device->reset_device) {
dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
accel_dev->accel_id);
hw_device->reset_device(accel_dev);
pci_restore_state(pdev);
}
}
static void adf_device_sriov_worker(struct work_struct *work)
{
struct adf_sriov_dev_data *sriov_data =
container_of(work, struct adf_sriov_dev_data, sriov_work);
adf_reenable_sriov(sriov_data->accel_dev);
complete(&sriov_data->compl);
}
static void adf_device_reset_worker(struct work_struct *work)
{
struct adf_reset_dev_data *reset_data =
container_of(work, struct adf_reset_dev_data, reset_work);
struct adf_accel_dev *accel_dev = reset_data->accel_dev;
unsigned long wait_jiffies = msecs_to_jiffies(10000);
struct adf_sriov_dev_data sriov_data;
adf_dev_restarting_notify(accel_dev);
if (adf_dev_restart(accel_dev)) {
dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
if (reset_data->mode == ADF_DEV_RESET_ASYNC)
kfree(reset_data);
WARN(1, "QAT: device restart failed. Device is unusable\n");
return;
}
sriov_data.accel_dev = accel_dev;
init_completion(&sriov_data.compl);
INIT_WORK(&sriov_data.sriov_work, adf_device_sriov_worker);
queue_work(device_sriov_wq, &sriov_data.sriov_work);
if (wait_for_completion_timeout(&sriov_data.compl, wait_jiffies))
adf_pf2vf_notify_restarted(accel_dev);
adf_dev_restarted_notify(accel_dev);
clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
if (reset_data->mode == ADF_DEV_RESET_ASYNC)
kfree(reset_data);
else
complete(&reset_data->compl);
}
static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
enum adf_dev_reset_mode mode)
{
struct adf_reset_dev_data *reset_data;
if (!adf_dev_started(accel_dev) ||
test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
return 0;
set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
reset_data = kzalloc_obj(*reset_data);
if (!reset_data)
return -ENOMEM;
reset_data->accel_dev = accel_dev;
init_completion(&reset_data->compl);
reset_data->mode = mode;
INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
queue_work(device_reset_wq, &reset_data->reset_work);
if (mode == ADF_DEV_RESET_SYNC) {
int ret = 0;
unsigned long wait_jiffies = msecs_to_jiffies(10000);
unsigned long timeout = wait_for_completion_timeout(
&reset_data->compl, wait_jiffies);
if (!timeout) {
dev_err(&GET_DEV(accel_dev),
"Reset device timeout expired\n");
cancel_work_sync(&reset_data->reset_work);
ret = -EFAULT;
}
kfree(reset_data);
return ret;
}
return 0;
}
static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
{
struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
int res = 0;
if (!accel_dev) {
pr_err("QAT: Can't find acceleration device\n");
return PCI_ERS_RESULT_DISCONNECT;
}
if (!pdev->is_busmaster)
pci_set_master(pdev);
pci_restore_state(pdev);
res = adf_dev_up(accel_dev, false);
if (res && res != -EALREADY)
return PCI_ERS_RESULT_DISCONNECT;
adf_reenable_sriov(accel_dev);
adf_pf2vf_notify_restarted(accel_dev);
adf_dev_restarted_notify(accel_dev);
clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
return PCI_ERS_RESULT_RECOVERED;
}
static void adf_resume(struct pci_dev *pdev)
{
dev_info(&pdev->dev, "Acceleration driver reset completed\n");
dev_info(&pdev->dev, "Device is up and running\n");
}
const struct pci_error_handlers adf_err_handler = {
.error_detected = adf_error_detected,
.slot_reset = adf_slot_reset,
.resume = adf_resume,
};
EXPORT_SYMBOL_GPL(adf_err_handler);
static int adf_dev_autoreset(struct adf_accel_dev *accel_dev)
{
if (accel_dev->autoreset_on_error)
return adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_ASYNC);
return 0;
}
static void adf_notify_fatal_error_worker(struct work_struct *work)
{
struct adf_fatal_error_data *wq_data =
container_of(work, struct adf_fatal_error_data, work);
struct adf_accel_dev *accel_dev = wq_data->accel_dev;
struct adf_hw_device_data *hw_device = accel_dev->hw_device;
adf_error_notifier(accel_dev);
if (!accel_dev->is_vf) {
if (accel_dev->autoreset_on_error && hw_device->exit_arb)
hw_device->exit_arb(accel_dev);
if (accel_dev->pf.vf_info)
adf_pf2vf_notify_fatal_error(accel_dev);
adf_dev_autoreset(accel_dev);
}
kfree(wq_data);
}
int adf_notify_fatal_error(struct adf_accel_dev *accel_dev)
{
struct adf_fatal_error_data *wq_data;
wq_data = kzalloc_obj(*wq_data, GFP_ATOMIC);
if (!wq_data)
return -ENOMEM;
wq_data->accel_dev = accel_dev;
INIT_WORK(&wq_data->work, adf_notify_fatal_error_worker);
adf_misc_wq_queue_work(&wq_data->work);
return 0;
}
int adf_init_aer(void)
{
device_reset_wq = alloc_workqueue("qat_device_reset_wq",
WQ_MEM_RECLAIM | WQ_PERCPU, 0);
if (!device_reset_wq)
return -EFAULT;
device_sriov_wq = alloc_workqueue("qat_device_sriov_wq", WQ_PERCPU, 0);
if (!device_sriov_wq) {
destroy_workqueue(device_reset_wq);
device_reset_wq = NULL;
return -EFAULT;
}
return 0;
}
void adf_exit_aer(void)
{
if (device_reset_wq)
destroy_workqueue(device_reset_wq);
device_reset_wq = NULL;
if (device_sriov_wq)
destroy_workqueue(device_sriov_wq);
device_sriov_wq = NULL;
}
