ASoC: Intel: avs: Prepare for firmware tracing

Firmware provides its own debug functionality. While coredump is one of
these, traces are the main area of interest. kfifo is enlisted to cache
log data that is being pumped to driver through SRAM. Separate DSP
operations are declared as actual feature implementation differs between
firmware generations.

As log gathering involves usage of IPCs, add all necessary: ENABLE_LOGS
and SYSTEM_TIME.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220516101116.190192-8-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/sound/soc/intel/avs/utils.c b/sound/soc/intel/avs/utils.c
index 6473e3ae4c6e..13611dee9787 100644
--- a/sound/soc/intel/avs/utils.c
+++ b/sound/soc/intel/avs/utils.c
@@ -7,6 +7,7 @@
 //
 
 #include <linux/firmware.h>
+#include <linux/kfifo.h>
 #include <linux/slab.h>
 #include "avs.h"
 #include "messages.h"
@@ -299,3 +300,25 @@ void avs_release_firmwares(struct avs_dev *adev)
 		kfree(entry);
 	}
 }
+
+unsigned int __kfifo_fromio_locked(struct kfifo *fifo, const void __iomem *src, unsigned int len,
+				   spinlock_t *lock)
+{
+	struct __kfifo *__fifo = &fifo->kfifo;
+	unsigned long flags;
+	unsigned int l, off;
+
+	spin_lock_irqsave(lock, flags);
+	len = min(len, kfifo_avail(fifo));
+	off = __fifo->in & __fifo->mask;
+	l = min(len, kfifo_size(fifo) - off);
+
+	memcpy_fromio(__fifo->data + off, src, l);
+	memcpy_fromio(__fifo->data, src + l, len - l);
+	/* Make sure data copied from SRAM is visible to all CPUs. */
+	smp_mb();
+	__fifo->in += len;
+	spin_unlock_irqrestore(lock, flags);
+
+	return len;
+}