ppc/xive: Add more interrupt notification tracing

Add more tracing around notification, redistribution, and escalation.

Signed-off-by: Glenn Miles <milesg@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Michael Kowal <kowal@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250512031100.439842-24-npiggin@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

3 files changed, 17 insertions, 5 deletions

diff --git a/hw/intc/trace-events b/hw/intc/trace-events
index 9ed2616..018c609 100644
--- a/hw/intc/trace-events
+++ b/hw/intc/trace-events
@@ -279,6 +279,8 @@ xive_tctx_notify(uint32_t index, uint8_t ring, uint8_t ipb, uint8_t pipr, uint8_
 xive_tctx_set_cppr(uint32_t index, uint8_t ring, uint8_t ipb, uint8_t pipr, uint8_t cppr, uint8_t nsr) "target=%d ring=0x%x IPB=0x%02x PIPR=0x%02x new CPPR=0x%02x NSR=0x%02x"
 xive_source_esb_read(uint64_t addr, uint32_t srcno, uint64_t value) "@0x%"PRIx64" IRQ 0x%x val=0x%"PRIx64
 xive_source_esb_write(uint64_t addr, uint32_t srcno, uint64_t value) "@0x%"PRIx64" IRQ 0x%x val=0x%"PRIx64
+xive_source_notify(uint32_t srcno) "Processing notification for queued IRQ 0x%x"
+xive_source_blocked(uint32_t srcno) "No action needed for IRQ 0x%x currently"
 xive_router_end_notify(uint8_t end_blk, uint32_t end_idx, uint32_t end_data) "END 0x%02x/0x%04x -> enqueue 0x%08x"
 xive_router_end_escalate(uint8_t end_blk, uint32_t end_idx, uint8_t esc_blk, uint32_t esc_idx, uint32_t end_data) "END 0x%02x/0x%04x -> escalate END 0x%02x/0x%04x data 0x%08x"
 xive_tctx_tm_write(uint32_t index, uint64_t offset, unsigned int size, uint64_t value) "target=%d @0x%"PRIx64" sz=%d val=0x%" PRIx64
@@ -289,6 +291,10 @@ xive_end_source_read(uint8_t end_blk, uint32_t end_idx, uint64_t addr) "END 0x%x
 # xive2.c
 xive_nvp_backlog_op(uint8_t blk, uint32_t idx, uint8_t op, uint8_t priority, uint8_t rc) "NVP 0x%x/0x%x operation=%d priority=%d rc=%d"
 xive_nvgc_backlog_op(bool c, uint8_t blk, uint32_t idx, uint8_t op, uint8_t priority, uint32_t rc) "NVGC crowd=%d 0x%x/0x%x operation=%d priority=%d rc=%d"
+xive_redistribute(uint32_t index, uint8_t ring, uint8_t end_blk, uint32_t end_idx) "Redistribute from target=%d ring=0x%x NVP 0x%x/0x%x"
+xive_end_enqueue(uint8_t end_blk, uint32_t end_idx, uint32_t end_data) "Queue event for END 0x%x/0x%x data=0x%x"
+xive_escalate_end(uint8_t end_blk, uint32_t end_idx, uint8_t esc_blk, uint32_t esc_idx, uint32_t esc_data) "Escalate from END 0x%x/0x%x to END 0x%x/0x%x data=0x%x"
+xive_escalate_esb(uint8_t end_blk, uint32_t end_idx, uint32_t lisn) "Escalate from END 0x%x/0x%x to LISN=0x%x"
 
 # pnv_xive.c
 pnv_xive_ic_hw_trigger(uint64_t addr, uint64_t val) "@0x%"PRIx64" val=0x%"PRIx64
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index 5483a81..d653946 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -1276,6 +1276,7 @@ static uint64_t xive_source_esb_read(void *opaque, hwaddr addr, unsigned size)
 
         /* Forward the source event notification for routing */
         if (ret) {
+            trace_xive_source_notify(srcno);
             xive_source_notify(xsrc, srcno);
         }
         break;
@@ -1371,6 +1372,8 @@ out:
     /* Forward the source event notification for routing */
     if (notify) {
         xive_source_notify(xsrc, srcno);
+    } else {
+        trace_xive_source_blocked(srcno);
     }
 }
 
diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c
index 9ef372b..f810e71 100644
--- a/hw/intc/xive2.c
+++ b/hw/intc/xive2.c
@@ -616,6 +616,7 @@ static void xive2_redistribute(Xive2Router *xrtr, XiveTCTX *tctx,
     uint8_t prio_limit;
     uint32_t cfg;
 
+    trace_xive_redistribute(tctx->cs->cpu_index, ring, nvp_blk, nvp_idx);
     /* convert crowd/group to blk/idx */
     if (group > 0) {
         nvgc_idx = (nvp_idx & (0xffffffff << group)) |
@@ -1455,6 +1456,7 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
     }
 
     if (!redistribute && xive2_end_is_enqueue(&end)) {
+        trace_xive_end_enqueue(end_blk, end_idx, end_data);
         xive2_end_enqueue(&end, end_data);
         /* Enqueuing event data modifies the EQ toggle and index */
         xive2_router_write_end(xrtr, end_blk, end_idx, &end, 1);
@@ -1631,11 +1633,11 @@ do_escalation:
          * Perform END Adaptive escalation processing
          * The END trigger becomes an Escalation trigger
          */
-        xive2_router_end_notify(xrtr,
-                               xive_get_field32(END2_W4_END_BLOCK,     end.w4),
-                               xive_get_field32(END2_W4_ESC_END_INDEX, end.w4),
-                               xive_get_field32(END2_W5_ESC_END_DATA,  end.w5),
-                               false);
+        uint8_t esc_blk = xive_get_field32(END2_W4_END_BLOCK, end.w4);
+        uint32_t esc_idx = xive_get_field32(END2_W4_ESC_END_INDEX, end.w4);
+        uint32_t esc_data = xive_get_field32(END2_W5_ESC_END_DATA, end.w5);
+        trace_xive_escalate_end(end_blk, end_idx, esc_blk, esc_idx, esc_data);
+        xive2_router_end_notify(xrtr, esc_blk, esc_idx, esc_data, false);
     } /* end END adaptive escalation */
 
     else {
@@ -1652,6 +1654,7 @@ do_escalation:
         lisn = XIVE_EAS(xive_get_field32(END2_W4_END_BLOCK,     end.w4),
                         xive_get_field32(END2_W4_ESC_END_INDEX, end.w4));
 
+        trace_xive_escalate_esb(end_blk, end_idx, lisn);
         xive2_notify(xrtr, lisn, true /* pq_checked */);
     }