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authorSerge Semin <fancer.lancer@gmail.com>2016-12-20 12:48:20 +0300
committerJon Mason <jdmason@kudzu.us>2017-07-06 11:30:07 -0400
commitbc3e49adc279c5505d6df8dd8c7fca45d6d3d21a (patch)
tree565b2b2bcbc04243e69661e6d067a8ada86517ac /drivers/ntb
parentd67288a39584daad11edee9b03d53264ba147453 (diff)
downloadlinux-bc3e49adc279c5505d6df8dd8c7fca45d6d3d21a.tar.bz2
NTB: Add Messaging NTB API
Some IDT NTB-capable PCIe-switches have message registers to communicate with peer devices. This patch adds new NTB API callback methods, which can be used to utilize these registers functionality: ntb_msg_count(); - get number of message registers ntb_msg_inbits(); - get bitfield of inbound message registers status ntb_msg_outbits(); - get bitfield of outbound message registers status ntb_msg_read_sts(); - read the inbound and outbound message registers status ntb_msg_clear_sts(); - clear status bits of message registers ntb_msg_set_mask(); - mask interrupts raised by status bits of message registers. ntb_msg_clear_mask(); - clear interrupts mask bits of message registers ntb_msg_read(midx, *pidx); - read message register with specified index, additionally getting peer port index which data received from ntb_msg_write(midx, pidx); - write data to the specified message register sending it to the passed peer device connected over a pidx port ntb_msg_event(); - notify driver context of a new message event Of course there is hardware which doesn't support Message registers, so this API is made optional. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Allen Hubbe <Allen.Hubbe@dell.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'drivers/ntb')
-rw-r--r--drivers/ntb/ntb.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/ntb/ntb.c b/drivers/ntb/ntb.c
index 2551bb2ff4a4..03b80d89b980 100644
--- a/drivers/ntb/ntb.c
+++ b/drivers/ntb/ntb.c
@@ -193,6 +193,19 @@ void ntb_db_event(struct ntb_dev *ntb, int vector)
}
EXPORT_SYMBOL(ntb_db_event);
+void ntb_msg_event(struct ntb_dev *ntb)
+{
+ unsigned long irqflags;
+
+ spin_lock_irqsave(&ntb->ctx_lock, irqflags);
+ {
+ if (ntb->ctx_ops && ntb->ctx_ops->msg_event)
+ ntb->ctx_ops->msg_event(ntb->ctx);
+ }
+ spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
+}
+EXPORT_SYMBOL(ntb_msg_event);
+
int ntb_default_port_number(struct ntb_dev *ntb)
{
switch (ntb->topo) {