From: David Kershner <david.kersh...@unisys.com>
Add support to visorbus to update the features in the channel queues.
Signal queues features is the memory location to disable/enable signal
queue interrupts.
Signed-off-by: David Kershner <david.kersh...@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.ro...@unisys.com>
---
drivers/staging/unisys/include/visorbus.h | 4 +++
drivers/staging/unisys/visorbus/visorchannel.c | 46 ++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/drivers/staging/unisys/include/visorbus.h
b/drivers/staging/unisys/include/visorbus.h
index 9235536..644ca30 100644
--- a/drivers/staging/unisys/include/visorbus.h
+++ b/drivers/staging/unisys/include/visorbus.h
@@ -218,6 +218,10 @@ char *visorchannel_uuid_id(uuid_le *guid, char *s);
void visorchannel_debug(struct visorchannel *channel, int num_queues,
struct seq_file *seq, u32 off);
void __iomem *visorchannel_get_header(struct visorchannel *channel);
+void visorchannel_set_sig_features(struct visorchannel *channel, u32 queue,
+ u64 features);
+void visorchannel_clear_sig_features(struct visorchannel *channel, u32 queue,
+ u64 features);
#define BUS_ROOT_DEVICE UINT_MAX
struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
diff --git a/drivers/staging/unisys/visorbus/visorchannel.c
b/drivers/staging/unisys/visorbus/visorchannel.c
index a4e117f..2ef79fa 100644
--- a/drivers/staging/unisys/visorbus/visorchannel.c
+++ b/drivers/staging/unisys/visorbus/visorchannel.c
@@ -538,6 +538,52 @@ visorchannel_signalqueue_max_slots(struct visorchannel
*channel, u32 queue)
}
EXPORT_SYMBOL_GPL(visorchannel_signalqueue_max_slots);
+/**
+ * visorchannel_clear_or_set_sig_features
+ *
+ * Clear or set bits within the 64-bit features word for the
+ * specified channel and queue.
+ * @channel: the channel to modify features for.
+ * @queue: the queue number to modify features for.
+ * @features: a mask of feature bits usage based on is_set flag;
+ * @is_set: if is_set is true, 1 bits indicate which features bits
+ * you want to set within the feature word;
+ * if is_set is false, 1 bits indicate which feature bits
+ * you want to clear within the features word
+ */
+void
+visorchannel_clear_or_set_sig_features(struct visorchannel *channel,
+ u32 queue, u64 features, bool is_set)
+{
+ struct signal_queue_header sig_hdr;
+
+ if (!sig_read_header(channel, queue, &sig_hdr))
+ return;
+ sig_hdr.features = (is_set) ? sig_hdr.features | features :
+ sig_hdr.features & !features;
+ if (!SIG_WRITE_FIELD(channel, queue, &sig_hdr, features))
+ return;
+ wmb(); /* required to sync channel with IOSP */
+}
+
+void
+visorchannel_clear_sig_features(struct visorchannel *channel, u32 queue,
+ u64 features)
+{
+ visorchannel_clear_or_set_sig_features(channel, queue, features,
+ false);
+}
+EXPORT_SYMBOL_GPL(visorchannel_clear_sig_features);
+
+void
+visorchannel_set_sig_features(struct visorchannel *channel, u32 queue,
+ u64 features)
+{
+ visorchannel_clear_or_set_sig_features(channel, queue, features,
+ true);
+}
+EXPORT_SYMBOL_GPL(visorchannel_set_sig_features);
+
static void
sigqueue_debug(struct signal_queue_header *q, int which, struct seq_file *seq)
{
--
2.5.0
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