hw/audio/es1370: trace lost interrupts

It turns out that there are drivers which assume that interrupts
can't be lost. E.g. the AROS sb128 driver is such a driver. Add
a lost interrupt tracepoint to debug this kind of issues.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <20230917065813.6692-8-vr_qemu@t-online.de>

hw/audio/es1370.c

@@ -602,7 +602,7 @@ static uint64_t es1370_read(void *opaque, hwaddr addr, unsigned size)
 }
 
 static void es1370_transfer_audio (ES1370State *s, struct chan *d, int loop_sel,
-                                   int max, int *irq)
+                                   int max, bool *irq)
 {
     uint8_t tmpbuf[4096];
     size_t to_transfer;
@@ -657,10 +657,13 @@ static void es1370_transfer_audio (ES1370State *s, struct chan *d, int loop_sel,
     }
 
     if (csc_bytes == transferred) {
-        *irq = 1;
+        if (*irq) {
+            trace_es1370_lost_interrupt(index);
+        }
+        *irq = true;
         d->scount = sc | (sc << 16);
     } else {
-        *irq = 0;
+        *irq = false;
         d->scount = sc | (((csc_bytes - transferred - 1) >> d->shift) << 16);
     }
 
@@ -688,7 +691,8 @@ static void es1370_transfer_audio (ES1370State *s, struct chan *d, int loop_sel,
 static void es1370_run_channel (ES1370State *s, size_t chan, int free_or_avail)
 {
     uint32_t new_status = s->status;
-    int max_bytes, irq;
+    int max_bytes;
+    bool irq;
     struct chan *d = &s->chan[chan];
     const struct chan_bits *b = &es1370_chan_bits[chan];
 
@@ -702,6 +706,8 @@ static void es1370_run_channel (ES1370State *s, size_t chan, int free_or_avail)
         return;
     }
 
+    irq = s->sctl & b->sctl_inten && s->status & b->stat_int;
+
     es1370_transfer_audio (s, d, b->sctl_loopsel, max_bytes, &irq);
 
     if (irq) {

hw/audio/trace-events

@@ -11,10 +11,11 @@ es1370_frame_address_rd(int ch, uint32_t addr) "ch=%d addr=0x%08x"
 es1370_frame_address_wr(int ch, uint32_t addr) "ch=%d addr=0x%08x"
 es1370_frame_count_rd(int ch, uint32_t curr, uint32_t size) "ch=%d CURR_CT=%u BUF_SIZE=%u"
 es1370_frame_count_wr(int ch, uint32_t curr, uint32_t size) "ch=%d CURR_CT=%u BUF_SIZE=%u"
+es1370_lost_interrupt(int ch) "ch=%d lost interrupt"
 es1370_sample_count_rd(int ch, uint32_t curr, uint32_t num) "ch=%d CURR_SAMP_CT=%u SAMP_CT=%u"
 es1370_sample_count_wr(int ch, uint32_t curr, uint32_t num) "ch=%d CURR_SAMP_CT=%u SAMP_CT=%u"
 es1370_stream_format(int ch, uint32_t freq, const char *fmt, const char *mode, uint32_t shift) "ch=%d fmt=%u:%s:%s shift=%u"
-es1370_transfer_audio(int ch, uint32_t f_curr, uint32_t f_size, uint32_t s_curr, uint32_t s_num, uint32_t leftover, int irq) "ch=%d CURR_CT=%u BUF_SIZE=%u CURR_SAMP_CT=%u SAMP_CT=%u leftover=%u irq=%d"
+es1370_transfer_audio(int ch, uint32_t f_curr, uint32_t f_size, uint32_t s_curr, uint32_t s_num, uint32_t leftover, bool irq) "ch=%d CURR_CT=%u BUF_SIZE=%u CURR_SAMP_CT=%u SAMP_CT=%u leftover=%u irq=%d"
 
 # hda-codec.c
 hda_audio_running(const char *stream, int nr, bool running) "st %s, nr %d, run %d"