/**
* genwqe_stop() - Stop card operation
*
* Recovery notes:
* As long as genwqe_thread runs we might access registers during
* error data capture. Same is with the genwqe_health_thread.
* When genwqe_bus_reset() fails this function might called two times:
* first by the genwqe_health_thread() and later by genwqe_remove() to
* unbind the device. We must be able to survive that.
*
* This function must be robust enough to be called twice.
*/
static int genwqe_stop(struct genwqe_dev *cd)
{
genwqe_finish_queue(cd); /* no register access */
genwqe_device_remove(cd); /* device removed, procs killed */
genwqe_release_service_layer(cd); /* here genwqe_thread is stopped */
if (genwqe_is_privileged(cd)) {
pci_disable_sriov(cd->pci_dev); /* access pci config space */
genwqe_ffdc_buffs_free(cd);
}
return 0;
}
/**
* genwqe_probe() - Device initialization
* @pdev: PCI device information struct
*
* Callable for multiple cards. This function is called on bind.
*
* Return: 0 if succeeded, < 0 when failed
*/
static int genwqe_probe(struct pci_dev *pci_dev,
const struct pci_device_id *id)
{
int err;
struct genwqe_dev *cd;
genwqe_init_crc32();
cd = genwqe_dev_alloc();
if (IS_ERR(cd)) {
dev_err(&pci_dev->dev, "err: could not alloc mem (err=%d)!\n",
(int)PTR_ERR(cd));
return PTR_ERR(cd);
}
dev_set_drvdata(&pci_dev->dev, cd);
cd->pci_dev = pci_dev;
err = genwqe_pci_setup(cd);
if (err < 0) {
dev_err(&pci_dev->dev,
"err: problems with PCI setup (err=%d)\n", err);
goto out_free_dev;
}
err = genwqe_start(cd);
if (err < 0) {
dev_err(&pci_dev->dev,
"err: cannot start card services! (err=%d)\n", err);
goto out_pci_remove;
}
if (genwqe_is_privileged(cd)) {
err = genwqe_health_check_start(cd);
if (err < 0) {
dev_err(&pci_dev->dev,
"err: cannot start health checking! (err=%d)\n",
err);
goto out_stop_services;
}
}
return 0;
out_stop_services:
genwqe_stop(cd);
out_pci_remove:
genwqe_pci_remove(cd);
out_free_dev:
genwqe_dev_free(cd);
return err;
}
/**
* genwqe_is_visible() - Determine if sysfs attribute should be visible or not
*
* VFs have restricted mmio capabilities, so not all sysfs entries
* are allowed in VFs.
*/
static umode_t genwqe_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
unsigned int j;
struct device *dev = container_of(kobj, struct device, kobj);
struct genwqe_dev *cd = dev_get_drvdata(dev);
umode_t mode = attr->mode;
if (genwqe_is_privileged(cd))
return mode;
for (j = 0; genwqe_normal_attributes[j] != NULL; j++)
if (genwqe_normal_attributes[j] == attr)
return mode;
return 0;
}
static int genwqe_start(struct genwqe_dev *cd)
{
int err;
struct pci_dev *pci_dev = cd->pci_dev;
err = genwqe_read_ids(cd);
if (err)
return err;
if (genwqe_is_privileged(cd)) {
/* do this after the tweaks. alloc fail is acceptable */
genwqe_ffdc_buffs_alloc(cd);
genwqe_stop_traps(cd);
/* Collect registers e.g. FIRs, UNITIDs, traces ... */
genwqe_read_ffdc_regs(cd, cd->ffdc[GENWQE_DBG_REGS].regs,
cd->ffdc[GENWQE_DBG_REGS].entries, 0);
genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT0,
cd->ffdc[GENWQE_DBG_UNIT0].regs,
cd->ffdc[GENWQE_DBG_UNIT0].entries);
genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT1,
cd->ffdc[GENWQE_DBG_UNIT1].regs,
cd->ffdc[GENWQE_DBG_UNIT1].entries);
genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT2,
cd->ffdc[GENWQE_DBG_UNIT2].regs,
cd->ffdc[GENWQE_DBG_UNIT2].entries);
genwqe_start_traps(cd);
if (cd->card_state == GENWQE_CARD_FATAL_ERROR) {
dev_warn(&pci_dev->dev,
"[%s] chip reload/recovery!\n", __func__);
/*
* Stealth Mode: Reload chip on either hot
* reset or PERST.
*/
cd->softreset = 0x7Cull;
__genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET,
cd->softreset);
err = genwqe_bus_reset(cd);
if (err != 0) {
dev_err(&pci_dev->dev,
"[%s] err: bus reset failed!\n",
__func__);
goto out;
}
/*
* Re-read the IDs because
* it could happen that the bitstream load
* failed!
*/
err = genwqe_read_ids(cd);
if (err)
goto out;
}
}
err = genwqe_setup_service_layer(cd); /* does a reset to the card */
if (err != 0) {
dev_err(&pci_dev->dev,
"[%s] err: could not setup servicelayer!\n", __func__);
err = -ENODEV;
goto out;
}
if (genwqe_is_privileged(cd)) { /* code is running _after_ reset */
genwqe_tweak_hardware(cd);
genwqe_setup_pf_jtimer(cd);
genwqe_setup_vf_jtimer(cd);
}
err = genwqe_device_create(cd);
if (err < 0) {
dev_err(&pci_dev->dev,
"err: chdev init failed! (err=%d)\n", err);
goto out_release_service_layer;
}
return 0;
out_release_service_layer:
genwqe_release_service_layer(cd);
out:
if (genwqe_is_privileged(cd))
genwqe_ffdc_buffs_free(cd);
return -EIO;
}
