diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index fb0e5f1c12d1e0fcce26f787d8da4e69a6c81f75..1107a9b118c32f10185e534843cdbed6a00db664 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -46,7 +46,6 @@ static bool ahci_map_fis_address(AHCIDevice *ad);
 static void ahci_unmap_clb_address(AHCIDevice *ad);
 static void ahci_unmap_fis_address(AHCIDevice *ad);
 
-__attribute__((__unused__)) /* TODO */
 static const char *AHCIPortReg_lookup[AHCI_PORT_REG__COUNT] = {
     [AHCI_PORT_REG_LST_ADDR]    = "PxCLB",
     [AHCI_PORT_REG_LST_ADDR_HI] = "PxCLBU",
@@ -149,10 +148,12 @@ static uint32_t ahci_port_read(AHCIState *s, int port, int offset)
         val = pr->cmd_issue;
         break;
     default:
+        trace_ahci_port_read_default(s, port, AHCIPortReg_lookup[regnum],
+                                     offset);
         val = 0;
     }
 
-    trace_ahci_port_read(s, port, offset, val);
+    trace_ahci_port_read(s, port, AHCIPortReg_lookup[regnum], offset, val);
     return val;
 }
 
diff --git a/hw/ide/trace-events b/hw/ide/trace-events
index 5c0e59ec4263a5860197659cf10b660a98e437e8..0db18d82714c338372157aa664412a6a9e872ab3 100644
--- a/hw/ide/trace-events
+++ b/hw/ide/trace-events
@@ -63,7 +63,8 @@ ide_atapi_cmd_read_dma_cb_aio(void *s, int lba, int n) "IDEState: %p; aio read:
 ide_atapi_cmd_packet(void *s, uint16_t limit, const char *packet) "IDEState: %p; limit=0x%x packet: %s"
 
 # hw/ide/ahci.c
-ahci_port_read(void *s, int port, int offset, uint32_t ret) "ahci(%p)[%d]: port read @ 0x%x: 0x%08x"
+ahci_port_read(void *s, int port, const char *reg, int offset, uint32_t ret) "ahci(%p)[%d]: port read [reg:%s] @ 0x%x: 0x%08x"
+ahci_port_read_default(void *s, int port, const char *reg, int offset) "ahci(%p)[%d]: unimplemented port read [reg:%s] @ 0x%x"
 ahci_irq_raise(void *s) "ahci(%p): raise irq"
 ahci_irq_lower(void *s) "ahci(%p): lower irq"
 ahci_check_irq(void *s, uint32_t old, uint32_t new) "ahci(%p): check irq 0x%08x --> 0x%08x"