[PATCH v3 4/6] hw/xen/xen-mapcache.c: convert DPRINTF to tracepoints

[Manos Pitsidianakis <manos.pitsidianakis@xxxxxxxxxx>]

Tracing DPRINTFs to stderr might not be desired. A developer that relies
on tracepoints should be able to opt-in to each tracepoint 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 tracepoints.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@xxxxxxxxxx>
---
 hw/xen/trace-events   | 11 +++++++++
 hw/xen/xen-mapcache.c | 54 +++++++++++++++++++------------------------
 2 files changed, 35 insertions(+), 30 deletions(-)

diff --git a/hw/xen/trace-events b/hw/xen/trace-events
index 67a6c41926..a65dc0e55f 100644
--- a/hw/xen/trace-events
+++ b/hw/xen/trace-events
@@ -60,3 +60,14 @@ cpu_ioreq_config_write(void *req, uint32_t sbdf, uint32_t 
reg, uint32_t size, ui
 xen_map_cache(uint64_t phys_addr) "want 0x%"PRIx64
 xen_remap_bucket(uint64_t index) "index 0x%"PRIx64
 xen_map_cache_return(void* ptr) "%p"
+xen_map_cache_init(uint64_t nr_buckets, uint64_t size) "nr_buckets = 
0x%"PRIx64" size 0x%"PRIx64
+xen_replace_cache_entry_dummy(uint64_t old_phys_addr, uint64_t new_phys_addr) 
"Replacing a dummy mapcache entry for 0x%"PRIx64" with 0x%"PRIx64
+xen_invalidate_map_cache_entry_unlocked_not_found(void *p) "could not find %p"
+xen_invalidate_map_cache_entry_unlocked_found(uint64_t addr, void *p) "   
0x%"PRIx64" -> %p is present"
+xen_invalidate_map_cache_entry_unlocked_miss(void *buffer) "Trying to unmap 
address %p that is not in the mapcache"
+xen_replace_cache_entry_unlocked_could_not_update_entry(uint64_t 
old_phys_addr) "Unable to update a mapcache entry for 0x%"PRIx64
+xen_ram_addr_from_mapcache_not_found(void *p) "could not find %p"
+xen_ram_addr_from_mapcache_found(uint64_t addr, void *p) "   0x%"PRIx64" -> %p 
is present"
+xen_ram_addr_from_mapcache_not_in_cache(void *p) "Trying to find address %p 
that is not in the mapcache"
+xen_replace_cache_entry_unlocked(uint64_t old_phys_addr) "Trying to update an 
entry for 0x%"PRIx64" that is not in the mapcache"
+xen_invalidate_map_cache(uint64_t paddr_index, void *vaddr_req) "Locked DMA 
mapping while invalidating mapcache 0x%"PRIx64" -> %p is present"
diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c
index f7d974677d..336c212376 100644
--- a/hw/xen/xen-mapcache.c
+++ b/hw/xen/xen-mapcache.c
@@ -22,16 +22,6 @@
 #include "trace.h"
 
 
-//#define MAPCACHE_DEBUG
-
-#ifdef MAPCACHE_DEBUG
-#  define DPRINTF(fmt, ...) do { \
-    fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \
-} while (0)
-#else
-#  define DPRINTF(fmt, ...) do { } while (0)
-#endif
-
 #if HOST_LONG_BITS == 32
 #  define MCACHE_BUCKET_SHIFT 16
 #  define MCACHE_MAX_SIZE     (1UL<<31) /* 2GB Cap */
@@ -145,8 +135,7 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void 
*opaque)
 
     size = mapcache->nr_buckets * sizeof (MapCacheEntry);
     size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
-    DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
-            mapcache->nr_buckets, size);
+    trace_xen_map_cache_init(mapcache->nr_buckets, size);
     mapcache->entry = g_malloc0(size);
 }
 
@@ -286,7 +275,9 @@ tryagain:
         test_bits(address_offset >> XC_PAGE_SHIFT,
                   test_bit_size >> XC_PAGE_SHIFT,
                   mapcache->last_entry->valid_mapping)) {
-        trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + 
address_offset);
+        trace_xen_map_cache_return(
+            mapcache->last_entry->vaddr_base + address_offset
+        );
         return mapcache->last_entry->vaddr_base + address_offset;
     }
 
@@ -368,7 +359,9 @@ tryagain:
         QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
     }
 
-    trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + 
address_offset);
+    trace_xen_map_cache_return(
+        mapcache->last_entry->vaddr_base + address_offset
+    );
     return mapcache->last_entry->vaddr_base + address_offset;
 }
 
@@ -402,10 +395,10 @@ ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
         }
     }
     if (!found) {
-        fprintf(stderr, "%s, could not find %p\n", __func__, ptr);
+        trace_xen_ram_addr_from_mapcache_not_found(ptr);
         QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
-            DPRINTF("   "HWADDR_FMT_plx" -> %p is present\n", 
reventry->paddr_index,
-                    reventry->vaddr_req);
+            trace_xen_ram_addr_from_mapcache_found(reventry->paddr_index,
+                                                   reventry->vaddr_req);
         }
         abort();
         return 0;
@@ -416,7 +409,7 @@ ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
         entry = entry->next;
     }
     if (!entry) {
-        DPRINTF("Trying to find address %p that is not in the mapcache!\n", 
ptr);
+        trace_xen_ram_addr_from_mapcache_not_in_cache(ptr);
         raddr = 0;
     } else {
         raddr = (reventry->paddr_index << MCACHE_BUCKET_SHIFT) +
@@ -443,9 +436,12 @@ static void 
xen_invalidate_map_cache_entry_unlocked(uint8_t *buffer)
         }
     }
     if (!found) {
-        DPRINTF("%s, could not find %p\n", __func__, buffer);
+        trace_xen_invalidate_map_cache_entry_unlocked_not_found(buffer);
         QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
-            DPRINTF("   "HWADDR_FMT_plx" -> %p is present\n", 
reventry->paddr_index, reventry->vaddr_req);
+            trace_xen_invalidate_map_cache_entry_unlocked_found(
+                reventry->paddr_index,
+                reventry->vaddr_req
+            );
         }
         return;
     }
@@ -463,7 +459,7 @@ static void xen_invalidate_map_cache_entry_unlocked(uint8_t 
*buffer)
         entry = entry->next;
     }
     if (!entry) {
-        DPRINTF("Trying to unmap address %p that is not in the mapcache!\n", 
buffer);
+        trace_xen_invalidate_map_cache_entry_unlocked_miss(buffer);
         return;
     }
     entry->lock--;
@@ -502,9 +498,8 @@ void xen_invalidate_map_cache(void)
         if (!reventry->dma) {
             continue;
         }
-        fprintf(stderr, "Locked DMA mapping while invalidating mapcache!"
-                " "HWADDR_FMT_plx" -> %p is present\n",
-                reventry->paddr_index, reventry->vaddr_req);
+        trace_xen_invalidate_map_cache(reventry->paddr_index,
+                                       reventry->vaddr_req);
     }
 
     for (i = 0; i < mapcache->nr_buckets; i++) {
@@ -562,24 +557,23 @@ static uint8_t *xen_replace_cache_entry_unlocked(hwaddr 
old_phys_addr,
         entry = entry->next;
     }
     if (!entry) {
-        DPRINTF("Trying to update an entry for "HWADDR_FMT_plx \
-                "that is not in the mapcache!\n", old_phys_addr);
+        trace_xen_replace_cache_entry_unlocked(old_phys_addr);
         return NULL;
     }
 
     address_index  = new_phys_addr >> MCACHE_BUCKET_SHIFT;
     address_offset = new_phys_addr & (MCACHE_BUCKET_SIZE - 1);
 
-    fprintf(stderr, "Replacing a dummy mapcache entry for "HWADDR_FMT_plx \
-            " with "HWADDR_FMT_plx"\n", old_phys_addr, new_phys_addr);
+    trace_xen_replace_cache_entry_dummy(old_phys_addr, new_phys_addr);
 
     xen_remap_bucket(entry, entry->vaddr_base,
                      cache_size, address_index, false);
     if (!test_bits(address_offset >> XC_PAGE_SHIFT,
                 test_bit_size >> XC_PAGE_SHIFT,
                 entry->valid_mapping)) {
-        DPRINTF("Unable to update a mapcache entry for "HWADDR_FMT_plx"!\n",
-                old_phys_addr);
+        trace_xen_replace_cache_entry_unlocked_could_not_update_entry(
+            old_phys_addr
+        );
         return NULL;
     }
 
-- 
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