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NTB: switchtec: Add link event notifier callback

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In order for the Switchtec NTB code to handle link change events we
create a notifier callback in the switchtec code which gets called
whenever an appropriate event interrupt occurs.

In order to preserve userspace's ability to follow these events,
we compare the event count with a stored copy from last time we
checked.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Stephen Bates <sbates@raithlin.com>
Reviewed-by: Kurt Schwemmer <kurt.schwemmer@microsemi.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe 2017-08-03 12:19:43 -06:00 • committed by Jon Mason
parent c082b04c9d
commit 48c302dc8f
2 changed files with 55 additions and 0 deletions
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4
include/linux/switchtec.h
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@ -353,6 +353,10 @@ struct switchtec_dev {
wait_queue_head_t event_wq;
atomic_t event_cnt;
struct work_struct link_event_work;
void (*link_notifier)(struct switchtec_dev *stdev);
u8 link_event_count[SWITCHTEC_MAX_PFF_CSR];
};
static inline struct switchtec_dev *to_stdev(struct device *dev)