[Qemu-devel] [PATCH 2/6] trace: Remove %s in grlib trace events

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

Trace events cannot use %s in their format strings because trace
backends vary in how they can deference pointers (if at all).  Recording
const char * values is not meaningful if their contents are not recorded
too.

Change grlib trace events that rely on strings so that they communicate
similar information without using strings.

A follow-up patch explains this limitation and updates docs/tracing.txt.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 hw/grlib_apbuart.c |    2 +-
 hw/grlib_gptimer.c |   29 ++++++++++++++---------------
 hw/grlib_irqmp.c   |    4 ++--
 trace-events       |   10 +++++-----
 4 files changed, 22 insertions(+), 23 deletions(-)

diff --git a/hw/grlib_apbuart.c b/hw/grlib_apbuart.c
index 101b150..169a56e 100644
--- a/hw/grlib_apbuart.c
+++ b/hw/grlib_apbuart.c
@@ -133,7 +133,7 @@ grlib_apbuart_writel(void *opaque, target_phys_addr_t addr, uint32_t value)
         break;
     }
 
-    trace_grlib_apbuart_unknown_register("write", addr);
+    trace_grlib_apbuart_writel_unknown(addr, value);
 }
 
 static CPUReadMemoryFunc * const grlib_apbuart_read[] = {
diff --git a/hw/grlib_gptimer.c b/hw/grlib_gptimer.c
index 596a900..99e9033 100644
--- a/hw/grlib_gptimer.c
+++ b/hw/grlib_gptimer.c
@@ -165,15 +165,15 @@ static uint32_t grlib_gptimer_readl(void *opaque, target_phys_addr_t addr)
     /* Unit registers */
     switch (addr) {
     case SCALER_OFFSET:
-        trace_grlib_gptimer_readl(-1, "scaler:", unit->scaler);
+        trace_grlib_gptimer_readl(-1, addr, unit->scaler);
         return unit->scaler;
 
     case SCALER_RELOAD_OFFSET:
-        trace_grlib_gptimer_readl(-1, "reload:", unit->reload);
+        trace_grlib_gptimer_readl(-1, addr, unit->reload);
         return unit->reload;
 
     case CONFIG_OFFSET:
-        trace_grlib_gptimer_readl(-1, "config:", unit->config);
+        trace_grlib_gptimer_readl(-1, addr, unit->config);
         return unit->config;
 
     default:
@@ -189,17 +189,16 @@ static uint32_t grlib_gptimer_readl(void *opaque, target_phys_addr_t addr)
         switch (timer_addr) {
         case COUNTER_OFFSET:
             value = ptimer_get_count(unit->timers[id].ptimer);
-            trace_grlib_gptimer_readl(id, "counter value:", value);
+            trace_grlib_gptimer_readl(id, addr, value);
             return value;
 
         case COUNTER_RELOAD_OFFSET:
             value = unit->timers[id].reload;
-            trace_grlib_gptimer_readl(id, "reload value:", value);
+            trace_grlib_gptimer_readl(id, addr, value);
             return value;
 
         case CONFIG_OFFSET:
-            trace_grlib_gptimer_readl(id, "scaler value:",
-                                      unit->timers[id].config);
+            trace_grlib_gptimer_readl(id, addr, unit->timers[id].config);
             return unit->timers[id].config;
 
         default:
@@ -208,7 +207,7 @@ static uint32_t grlib_gptimer_readl(void *opaque, target_phys_addr_t addr)
 
     }
 
-    trace_grlib_gptimer_unknown_register("read", addr);
+    trace_grlib_gptimer_readl(-1, addr, 0);
     return 0;
 }
 
@@ -226,19 +225,19 @@ grlib_gptimer_writel(void *opaque, target_phys_addr_t addr, uint32_t value)
     case SCALER_OFFSET:
         value &= 0xFFFF; /* clean up the value */
         unit->scaler = value;
-        trace_grlib_gptimer_writel(-1, "scaler:", unit->scaler);
+        trace_grlib_gptimer_writel(-1, addr, unit->scaler);
         return;
 
     case SCALER_RELOAD_OFFSET:
         value &= 0xFFFF; /* clean up the value */
         unit->reload = value;
-        trace_grlib_gptimer_writel(-1, "reload:", unit->reload);
+        trace_grlib_gptimer_writel(-1, addr, unit->reload);
         grlib_gptimer_set_scaler(unit, value);
         return;
 
     case CONFIG_OFFSET:
         /* Read Only (disable timer freeze not supported) */
-        trace_grlib_gptimer_writel(-1, "config (Read Only):", 0);
+        trace_grlib_gptimer_writel(-1, addr, 0);
         return;
 
     default:
@@ -253,18 +252,18 @@ grlib_gptimer_writel(void *opaque, target_phys_addr_t addr, uint32_t value)
         /* GPTimer registers */
         switch (timer_addr) {
         case COUNTER_OFFSET:
-            trace_grlib_gptimer_writel(id, "counter:", value);
+            trace_grlib_gptimer_writel(id, addr, value);
             unit->timers[id].counter = value;
             grlib_gptimer_enable(&unit->timers[id]);
             return;
 
         case COUNTER_RELOAD_OFFSET:
-            trace_grlib_gptimer_writel(id, "reload:", value);
+            trace_grlib_gptimer_writel(id, addr, value);
             unit->timers[id].reload = value;
             return;
 
         case CONFIG_OFFSET:
-            trace_grlib_gptimer_writel(id, "config:", value);
+            trace_grlib_gptimer_writel(id, addr, value);
 
             if (value & GPTIMER_INT_PENDING) {
                 /* clear pending bit */
@@ -297,7 +296,7 @@ grlib_gptimer_writel(void *opaque, target_phys_addr_t addr, uint32_t value)
 
     }
 
-    trace_grlib_gptimer_unknown_register("write", addr);
+    trace_grlib_gptimer_writel(-1, addr, value);
 }
 
 static CPUReadMemoryFunc * const grlib_gptimer_read[] = {
diff --git a/hw/grlib_irqmp.c b/hw/grlib_irqmp.c
index f47c491..b8738fc 100644
--- a/hw/grlib_irqmp.c
+++ b/hw/grlib_irqmp.c
@@ -220,7 +220,7 @@ static uint32_t grlib_irqmp_readl(void *opaque, target_phys_addr_t addr)
         return state->extended[cpu];
     }
 
-    trace_grlib_irqmp_unknown_register("read", addr);
+    trace_grlib_irqmp_readl_unknown(addr);
     return 0;
 }
 
@@ -308,7 +308,7 @@ grlib_irqmp_writel(void *opaque, target_phys_addr_t addr, uint32_t value)
         return;
     }
 
-    trace_grlib_irqmp_unknown_register("write", addr);
+    trace_grlib_irqmp_writel_unknown(addr, value);
 }
 
 static CPUReadMemoryFunc * const grlib_irqmp_read[] = {
diff --git a/trace-events b/trace-events
index 703b745..8272c86 100644
--- a/trace-events
+++ b/trace-events
@@ -235,19 +235,19 @@ disable grlib_gptimer_disabled(int id, uint32_t config) "timer:%d Timer disable
 disable grlib_gptimer_restart(int id, uint32_t reload) "timer:%d reload val: 0x%x"
 disable grlib_gptimer_set_scaler(uint32_t scaler, uint32_t freq) "scaler:0x%x freq: 0x%x"
 disable grlib_gptimer_hit(int id) "timer:%d HIT"
-disable grlib_gptimer_readl(int id, const char *s, uint32_t val) "timer:%d %s 0x%x"
-disable grlib_gptimer_writel(int id, const char *s, uint32_t val) "timer:%d %s 0x%x"
-disable grlib_gptimer_unknown_register(const char *op, uint64_t val) "%s unknown register 0x%"PRIx64""
+disable grlib_gptimer_readl(int id, uint64_t addr, uint32_t val) "timer:%d addr 0x%"PRIx64" 0x%x"
+disable grlib_gptimer_writel(int id, uint64_t addr, uint32_t val) "timer:%d addr 0x%"PRIx64" 0x%x"
 
 # hw/grlib_irqmp.c
 disable grlib_irqmp_check_irqs(uint32_t pend, uint32_t force, uint32_t mask, uint32_t lvl1, uint32_t lvl2) "pend:0x%04x force:0x%04x mask:0x%04x lvl1:0x%04x lvl0:0x%04x\n"
 disable grlib_irqmp_ack(int intno) "interrupt:%d"
 disable grlib_irqmp_set_irq(int irq) "Raise CPU IRQ %d"
-disable grlib_irqmp_unknown_register(const char *op, uint64_t val) "%s unknown register 0x%"PRIx64""
+disable grlib_irqmp_readl_unknown(uint64_t addr) "addr 0x%"PRIx64""
+disable grlib_irqmp_writel_unknown(uint64_t addr, uint32_t value) "addr 0x%"PRIx64" value 0x%x"
 
 # hw/grlib_apbuart.c
 disable grlib_apbuart_event(int event) "event:%d"
-disable grlib_apbuart_unknown_register(const char *op, uint64_t val) "%s unknown register 0x%"PRIx64""
+disable grlib_apbuart_writel_unknown(uint64_t addr, uint32_t value) "addr 0x%"PRIx64" value 0x%x"
 
 # hw/leon3.c
 disable leon3_set_irq(int intno) "Set CPU IRQ %d"
-- 
1.7.4.1