struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata;
struct afu *afu = cfg->afu;
struct pci_dev *pdev = cfg->dev;
+ struct device *dev = &cfg->dev->dev;
struct afu_cmd *cmd;
u32 port_sel = scp->device->channel + 1;
int nseg, i, ncount;
}
spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ switch (cfg->state) {
+ case STATE_LIMBO:
+ dev_dbg_ratelimited(dev, "%s: device in limbo!\n", __func__);
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ goto out;
+ case STATE_FAILTERM:
+ dev_dbg_ratelimited(dev, "%s: device has failed!\n", __func__);
+ scp->result = (DID_NO_CONNECT << 16);
+ scp->scsi_done(scp);
+ rc = 0;
+ goto out;
+ default:
+ break;
+ }
+
cmd = cxlflash_cmd_checkout(afu);
if (unlikely(!cmd)) {
pr_err("%s: could not get a free command\n", __func__);
get_unaligned_be32(&((u32 *)scp->cmnd)[2]),
get_unaligned_be32(&((u32 *)scp->cmnd)[3]));
- rcr = send_tmf(afu, scp, TMF_LUN_RESET);
- if (unlikely(rcr))
+ switch (cfg->state) {
+ case STATE_NORMAL:
+ rcr = send_tmf(afu, scp, TMF_LUN_RESET);
+ if (unlikely(rcr))
+ rc = FAILED;
+ break;
+ case STATE_LIMBO:
+ wait_event(cfg->limbo_waitq, cfg->state != STATE_LIMBO);
+ if (cfg->state == STATE_NORMAL)
+ break;
+ /* fall through */
+ default:
rc = FAILED;
+ break;
+ }
pr_debug("%s: returning rc=%d\n", __func__, rc);
return rc;
get_unaligned_be32(&((u32 *)scp->cmnd)[2]),
get_unaligned_be32(&((u32 *)scp->cmnd)[3]));
- rcr = cxlflash_afu_reset(cfg);
- if (rcr == 0)
- rc = SUCCESS;
- else
+ switch (cfg->state) {
+ case STATE_NORMAL:
+ cfg->state = STATE_LIMBO;
+ scsi_block_requests(cfg->host);
+
+ rcr = cxlflash_afu_reset(cfg);
+ if (rcr) {
+ rc = FAILED;
+ cfg->state = STATE_FAILTERM;
+ } else
+ cfg->state = STATE_NORMAL;
+ wake_up_all(&cfg->limbo_waitq);
+ scsi_unblock_requests(cfg->host);
+ break;
+ case STATE_LIMBO:
+ wait_event(cfg->limbo_waitq, cfg->state != STATE_LIMBO);
+ if (cfg->state == STATE_NORMAL)
+ break;
+ /* fall through */
+ default:
rc = FAILED;
+ break;
+ }
pr_debug("%s: returning rc=%d\n", __func__, rc);
return rc;
struct pci_dev *pdev = cfg->dev;
if (pci_channel_offline(pdev))
- wait_event_timeout(cfg->eeh_waitq,
+ wait_event_timeout(cfg->limbo_waitq,
!pci_channel_offline(pdev),
CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT);
}
!cfg->tmf_active);
spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ cfg->state = STATE_FAILTERM;
+
switch (cfg->init_state) {
case INIT_STATE_SCSI:
scsi_remove_host(cfg->host);
struct afu *afu = cfg->afu;
struct device *dev = &cfg->dev->dev;
+ cxl_perst_reloads_same_image(cfg->cxl_afu, true);
+
rc = init_mc(cfg);
if (rc) {
dev_err(dev, "%s: call to init_mc failed, rc=%d!\n",
* the sync. This design point requires calling threads to not be on interrupt
* context due to the possibility of sleeping during concurrent sync operations.
*
+ * AFU sync operations are only necessary and allowed when the device is
+ * operating normally. When not operating normally, sync requests can occur as
+ * part of cleaning up resources associated with an adapter prior to removal.
+ * In this scenario, these requests are simply ignored (safe due to the AFU
+ * going away).
+ *
* Return:
* 0 on success
* -1 on failure
int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u,
res_hndl_t res_hndl_u, u8 mode)
{
+ struct cxlflash_cfg *cfg = afu->parent;
struct afu_cmd *cmd = NULL;
int rc = 0;
int retry_cnt = 0;
static DEFINE_MUTEX(sync_active);
+ if (cfg->state != STATE_NORMAL) {
+ pr_debug("%s: Sync not required! (%u)\n", __func__, cfg->state);
+ return 0;
+ }
+
mutex_lock(&sync_active);
retry:
cmd = cxlflash_cmd_checkout(afu);
*/
static void cxlflash_worker_thread(struct work_struct *work)
{
- struct cxlflash_cfg *cfg =
- container_of(work, struct cxlflash_cfg, work_q);
+ struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg,
+ work_q);
struct afu *afu = cfg->afu;
int port;
ulong lock_flags;
+ /* Avoid MMIO if the device has failed */
+
+ if (cfg->state != STATE_NORMAL)
+ return;
+
spin_lock_irqsave(cfg->host->host_lock, lock_flags);
if (cfg->lr_state == LINK_RESET_REQUIRED) {
cfg->dev = pdev;
cfg->dev_id = (struct pci_device_id *)dev_id;
cfg->mcctx = NULL;
- cfg->err_recovery_active = 0;
init_waitqueue_head(&cfg->tmf_waitq);
- init_waitqueue_head(&cfg->eeh_waitq);
+ init_waitqueue_head(&cfg->limbo_waitq);
INIT_WORK(&cfg->work_q, cxlflash_worker_thread);
cfg->lr_state = LINK_RESET_INVALID;
goto out;
}
+/**
+ * cxlflash_pci_error_detected() - called when a PCI error is detected
+ * @pdev: PCI device struct.
+ * @state: PCI channel state.
+ *
+ * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
+ */
+static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev,
+ pci_channel_state_t state)
+{
+ struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
+ struct device *dev = &cfg->dev->dev;
+
+ dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state);
+
+ switch (state) {
+ case pci_channel_io_frozen:
+ cfg->state = STATE_LIMBO;
+
+ /* Turn off legacy I/O */
+ scsi_block_requests(cfg->host);
+
+ term_mc(cfg, UNDO_START);
+ stop_afu(cfg);
+
+ return PCI_ERS_RESULT_NEED_RESET;
+ case pci_channel_io_perm_failure:
+ cfg->state = STATE_FAILTERM;
+ wake_up_all(&cfg->limbo_waitq);
+ scsi_unblock_requests(cfg->host);
+ return PCI_ERS_RESULT_DISCONNECT;
+ default:
+ break;
+ }
+ return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * cxlflash_pci_slot_reset() - called when PCI slot has been reset
+ * @pdev: PCI device struct.
+ *
+ * This routine is called by the pci error recovery code after the PCI
+ * slot has been reset, just before we should resume normal operations.
+ *
+ * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
+ */
+static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev)
+{
+ int rc = 0;
+ struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
+ struct device *dev = &cfg->dev->dev;
+
+ dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev);
+
+ rc = init_afu(cfg);
+ if (unlikely(rc)) {
+ dev_err(dev, "%s: EEH recovery failed! (%d)\n", __func__, rc);
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * cxlflash_pci_resume() - called when normal operation can resume
+ * @pdev: PCI device struct
+ */
+static void cxlflash_pci_resume(struct pci_dev *pdev)
+{
+ struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
+ struct device *dev = &cfg->dev->dev;
+
+ dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev);
+
+ cfg->state = STATE_NORMAL;
+ wake_up_all(&cfg->limbo_waitq);
+ scsi_unblock_requests(cfg->host);
+}
+
+static const struct pci_error_handlers cxlflash_err_handler = {
+ .error_detected = cxlflash_pci_error_detected,
+ .slot_reset = cxlflash_pci_slot_reset,
+ .resume = cxlflash_pci_resume,
+};
+
/*
* PCI device structure
*/
.id_table = cxlflash_pci_table,
.probe = cxlflash_probe,
.remove = cxlflash_remove,
+ .err_handler = &cxlflash_err_handler,
};
/**
projects / linux.git / commitdiff