stm class: Support devices that override software assigned masters

Some STM devices adjust software assigned master numbers depending on
the trace source and its runtime state and whatnot. This patch adds
a sysfs attribute to inform the trace-side software that master numbers
assigned to software sources will not match those in the STP stream,
so that, for example, master/channel allocation policy can be adjusted
accordingly.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/stm.h b/include/linux/stm.h
index 1a79ed8e43da..8369d8a8cabd 100644
--- a/include/linux/stm.h
+++ b/include/linux/stm.h
@@ -50,6 +50,8 @@ struct stm_device;
  * @sw_end:             last STP master available to software
  * @sw_nchannels:       number of STP channels per master
  * @sw_mmiosz:          size of one channel's IO space, for mmap, optional
+ * @hw_override:        masters in the STP stream will not match the ones
+ *                      assigned by software, but are up to the STM hardware
  * @packet:             callback that sends an STP packet
  * @mmio_addr:          mmap callback, optional
  * @link:               called when a new stm_source gets linked to us, optional
@@ -85,6 +87,7 @@ struct stm_data {
         unsigned int            sw_end;
         unsigned int            sw_nchannels;
         unsigned int            sw_mmiosz;
+        unsigned int            hw_override;
         ssize_t                 (*packet)(struct stm_data *, unsigned int,
                                           unsigned int, unsigned int,
                                           unsigned int, unsigned int,