Tracing DPRINTFs to stderr might not be desired. A developer that relies
on trace events should be able to opt-in to each trace event and rely on
QEMU's log redirection, instead of stderr by default.

This commit converts DPRINTFs in this file that are used for tracing
into trace events. DPRINTFs that report guest errors are logged with
LOG_GUEST_ERROR.#

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 hw/arm/strongarm.c  | 82 ++++++++++++++++++++++++++++-----------------
 hw/arm/trace-events |  3 ++
 2 files changed, 55 insertions(+), 30 deletions(-)

diff --git a/hw/arm/strongarm.c b/hw/arm/strongarm.c
index 7fd99a0f14..823b4931b0 100644
--- a/hw/arm/strongarm.c
+++ b/hw/arm/strongarm.c
@@ -46,8 +46,7 @@
 #include "qemu/log.h"
 #include "qom/object.h"
 #include "target/arm/cpu-qom.h"
-
-//#define DEBUG
+#include "trace.h"
 
 /*
  TODO
@@ -66,12 +65,6 @@
  - Enhance UART with modem signals
  */
 
-#ifdef DEBUG
-# define DPRINTF(format, ...) printf(format , ## __VA_ARGS__)
-#else
-# define DPRINTF(format, ...) do { } while (0)
-#endif
-
 static struct {
     hwaddr io_base;
     int irq;
@@ -151,8 +144,9 @@ static uint64_t strongarm_pic_mem_read(void *opaque, hwaddr offset,
     case ICPR:
         return s->pending;
     default:
-        printf("%s: Bad register offset 0x" HWADDR_FMT_plx "\n",
-                        __func__, offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad register offset 0x"HWADDR_FMT_plx"\n",
+                      __func__, offset);
         return 0;
     }
 }
@@ -173,8 +167,9 @@ static void strongarm_pic_mem_write(void *opaque, hwaddr offset,
         s->int_idle = (value & 1) ? 0 : ~0;
         break;
     default:
-        printf("%s: Bad register offset 0x" HWADDR_FMT_plx "\n",
-                        __func__, offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                     "%s: Bad register offset 0x"HWADDR_FMT_plx"\n",
+                     __func__, offset);
         break;
     }
     strongarm_pic_update(s);
@@ -333,7 +328,9 @@ static uint64_t strongarm_rtc_read(void *opaque, hwaddr addr,
                 ((qemu_clock_get_ms(rtc_clock) - s->last_hz) << 15) /
                 (1000 * ((s->rttr & 0xffff) + 1));
     default:
-        printf("%s: Bad register 0x" HWADDR_FMT_plx "\n", __func__, addr);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad rtc register read 0x"HWADDR_FMT_plx"\n",
+                      __func__, addr);
         return 0;
     }
 }
@@ -375,7 +372,9 @@ static void strongarm_rtc_write(void *opaque, hwaddr addr,
         break;
 
     default:
-        printf("%s: Bad register 0x" HWADDR_FMT_plx "\n", __func__, addr);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad rtc register write 0x"HWADDR_FMT_plx"\n",
+                      __func__, addr);
     }
 }
 
@@ -556,12 +555,12 @@ static uint64_t strongarm_gpio_read(void *opaque, hwaddr offset,
 
     case GPSR:        /* GPIO Pin-Output Set registers */
         qemu_log_mask(LOG_GUEST_ERROR,
-                      "strongarm GPIO: read from write only register GPSR\n");
+                      "%s: read from write only register GPSR\n", __func__);
         return 0;
 
     case GPCR:        /* GPIO Pin-Output Clear registers */
         qemu_log_mask(LOG_GUEST_ERROR,
-                      "strongarm GPIO: read from write only register GPCR\n");
+                      "%s: read from write only register GPCR\n", __func__);
         return 0;
 
     case GRER:        /* GPIO Rising-Edge Detect Enable registers */
@@ -581,7 +580,9 @@ static uint64_t strongarm_gpio_read(void *opaque, hwaddr offset,
         return s->status;
 
     default:
-        printf("%s: Bad offset 0x" HWADDR_FMT_plx "\n", __func__, offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad gpio read offset 0x"HWADDR_FMT_plx"\n",
+                      __func__, offset);
     }
 
     return 0;
@@ -626,7 +627,9 @@ static void strongarm_gpio_write(void *opaque, hwaddr offset,
         break;
 
     default:
-        printf("%s: Bad offset 0x" HWADDR_FMT_plx "\n", __func__, offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad write offset 0x"HWADDR_FMT_plx"\n",
+                      __func__, offset);
     }
 }
 
@@ -782,7 +785,9 @@ static uint64_t strongarm_ppc_read(void *opaque, hwaddr offset,
         return s->ppfr | ~0x7f001;
 
     default:
-        printf("%s: Bad offset 0x" HWADDR_FMT_plx "\n", __func__, offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad ppc read offset 0x"HWADDR_FMT_plx "\n",
+                      __func__, offset);
     }
 
     return 0;
@@ -817,7 +822,9 @@ static void strongarm_ppc_write(void *opaque, hwaddr offset,
         break;
 
     default:
-        printf("%s: Bad offset 0x" HWADDR_FMT_plx "\n", __func__, offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad ppc write offset 0x"HWADDR_FMT_plx"\n",
+                      __func__, offset);
     }
 }
 
@@ -1029,8 +1036,13 @@ static void strongarm_uart_update_parameters(StrongARMUARTState *s)
     s->char_transmit_time =  (NANOSECONDS_PER_SECOND / speed) * frame_size;
     qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
 
-    DPRINTF(stderr, "%s speed=%d parity=%c data=%d stop=%d\n", s->chr->label,
-            speed, parity, data_bits, stop_bits);
+    trace_strongarm_uart_update_parameters((s->chr.chr ?
+                                           s->chr.chr->label : "NULL") ?:
+                                           "NULL",
+                                           speed,
+                                           parity,
+                                           data_bits,
+                                           stop_bits);
 }
 
 static void strongarm_uart_rx_to(void *opaque)
@@ -1164,7 +1176,9 @@ static uint64_t strongarm_uart_read(void *opaque, hwaddr addr,
         return s->utsr1;
 
     default:
-        printf("%s: Bad register 0x" HWADDR_FMT_plx "\n", __func__, addr);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad uart register read 0x"HWADDR_FMT_plx"\n",
+                      __func__, addr);
         return 0;
     }
 }
@@ -1221,7 +1235,9 @@ static void strongarm_uart_write(void *opaque, hwaddr addr,
         break;
 
     default:
-        printf("%s: Bad register 0x" HWADDR_FMT_plx "\n", __func__, addr);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad uart register write 0x"HWADDR_FMT_plx"\n",
+                      __func__, addr);
     }
 }
 
@@ -1434,7 +1450,7 @@ static uint64_t strongarm_ssp_read(void *opaque, hwaddr addr,
             return 0xffffffff;
         }
         if (s->rx_level < 1) {
-            printf("%s: SSP Rx Underrun\n", __func__);
+            trace_strongarm_ssp_read_underrun();
             return 0xffffffff;
         }
         s->rx_level--;
@@ -1443,7 +1459,9 @@ static uint64_t strongarm_ssp_read(void *opaque, hwaddr addr,
         strongarm_ssp_fifo_update(s);
         return retval;
     default:
-        printf("%s: Bad register 0x" HWADDR_FMT_plx "\n", __func__, addr);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad ssp register read 0x"HWADDR_FMT_plx"\n",
+                      __func__, addr);
         break;
     }
     return 0;
@@ -1458,8 +1476,8 @@ static void strongarm_ssp_write(void *opaque, hwaddr addr,
     case SSCR0:
         s->sscr[0] = value & 0xffbf;
         if ((s->sscr[0] & SSCR0_SSE) && SSCR0_DSS(value) < 4) {
-            printf("%s: Wrong data size: %i bits\n", __func__,
-                   (int)SSCR0_DSS(value));
+            qemu_log_mask(LOG_GUEST_ERROR, "%s: Wrong data size: %i bits\n",
+                          __func__, (int)SSCR0_DSS(value));
         }
         if (!(value & SSCR0_SSE)) {
             s->sssr = 0;
@@ -1471,7 +1489,9 @@ static void strongarm_ssp_write(void *opaque, hwaddr addr,
     case SSCR1:
         s->sscr[1] = value & 0x2f;
         if (value & SSCR1_LBM) {
-            printf("%s: Attempt to use SSP LBM mode\n", __func__);
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "%s: Attempt to use SSP LBM mode\n",
+                          __func__);
         }
         strongarm_ssp_fifo_update(s);
         break;
@@ -1509,7 +1529,9 @@ static void strongarm_ssp_write(void *opaque, hwaddr addr,
         break;
 
     default:
-        printf("%s: Bad register 0x" HWADDR_FMT_plx "\n", __func__, addr);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad ssp register write 0x"HWADDR_FMT_plx"\n",
+                      __func__,  addr);
         break;
     }
 }
diff --git a/hw/arm/trace-events b/hw/arm/trace-events
index cdc1ea06a8..7c56943215 100644
--- a/hw/arm/trace-events
+++ b/hw/arm/trace-events
@@ -55,3 +55,6 @@ smmuv3_notify_flag_add(const char *iommu) "ADD SMMUNotifier node for iommu mr=%s
 smmuv3_notify_flag_del(const char *iommu) "DEL SMMUNotifier node for iommu mr=%s"
 smmuv3_inv_notifiers_iova(const char *name, uint16_t asid, uint16_t vmid, uint64_t iova, uint8_t tg, uint64_t num_pages) "iommu mr=%s asid=%d vmid=%d iova=0x%"PRIx64" tg=%d num_pages=0x%"PRIx64
 
+# strongarm.c
+strongarm_uart_update_parameters(const char *label, int speed, char parity, int data_bits, int stop_bits) "%s speed=%d parity=%c data=%d stop=%d"
+strongarm_ssp_read_underrun(void) "SSP rx underrun"
-- 
γαῖα πυρί μιχθήτω

Manos Pitsidianakis <manos.pitsidianakis@linaro.org> writes:

> Tracing DPRINTFs to stderr might not be desired. A developer that relies
> on trace events should be able to opt-in to each trace event and rely on
> QEMU's log redirection, instead of stderr by default.
>
> This commit converts DPRINTFs in this file that are used for tracing
> into trace events. DPRINTFs that report guest errors are logged with
> LOG_GUEST_ERROR.#
>
> Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro