[Qemu-devel] [PATCH v2] pci: add config space access traces

[Alexey Kardashevskiy <aik@ozlabs.ru>]

This adds pci_cfg_read and pci_cfg_write traces for config spaces accesses.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v2:
* added slot and function numbers into traces
* added arrows in trace strings
---
 hw/pci/pci_host.c | 11 ++++++++++-
 trace-events      |  4 ++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c
index 7dd9b25..77c7d1f 100644
--- a/hw/pci/pci_host.c
+++ b/hw/pci/pci_host.c
@@ -20,6 +20,7 @@
 
 #include "hw/pci/pci.h"
 #include "hw/pci/pci_host.h"
+#include "trace.h"
 
 /* debug PCI */
 //#define DEBUG_PCI
@@ -51,14 +52,22 @@ void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
                                   uint32_t limit, uint32_t val, uint32_t len)
 {
     assert(len <= 4);
+    trace_pci_cfg_write(pci_dev->name, PCI_SLOT(pci_dev->devfn),
+                        PCI_FUNC(pci_dev->devfn), addr, val);
     pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
 }
 
 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
                                      uint32_t limit, uint32_t len)
 {
+    uint32_t ret;
+
     assert(len <= 4);
-    return pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
+    ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
+    trace_pci_cfg_read(pci_dev->name, PCI_SLOT(pci_dev->devfn),
+                       PCI_FUNC(pci_dev->devfn), addr, ret);
+
+    return ret;
 }
 
 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)
diff --git a/trace-events b/trace-events
index 3856b5c..9d1d1df 100644
--- a/trace-events
+++ b/trace-events
@@ -1176,3 +1176,7 @@ object_class_dynamic_cast_assert(const char *type, const char *target, const cha
 # hw/xen/xen_pvdevice.c
 xen_pv_mmio_read(uint64_t addr) "WARNING: read from Xen PV Device MMIO space (address %"PRIx64")"
 xen_pv_mmio_write(uint64_t addr) "WARNING: write to Xen PV Device MMIO space (address %"PRIx64")"
+
+# hw/pci/pci_host.c
+pci_cfg_read(const char *dev, unsigned devid, unsigned fnid, unsigned offs, unsigned val) "%s %02u:%u @0x%x -> 0x%x"
+pci_cfg_write(const char *dev, unsigned devid, unsigned fnid, unsigned offs, unsigned val) "%s %02u:%u @0x%x <- 0x%x"
-- 
1.8.3.2