1 files changed, 44 insertions, 3 deletions

diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index 3a12b1ad0c63..361472b5788c 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -8,6 +8,7 @@
 
 #include <linux/kernel.h>
 #include <linux/mmiotrace.h>
+#include <linux/pci.h>
 
 #include "trace.h"
 
@@ -53,12 +54,52 @@ static void mmio_trace_ctrl_update(struct trace_array *tr)
         }
 }
 
+static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
+{
+        int ret = 0;
+        int i;
+        resource_size_t start, end;
+        const struct pci_driver *drv = pci_dev_driver(dev);
+
+        /* XXX: incomplete checks for trace_seq_printf() return value */
+        ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
+                                dev->bus->number, dev->devfn,
+                                dev->vendor, dev->device, dev->irq);
+        /*
+         * XXX: is pci_resource_to_user() appropriate, since we are
+         * supposed to interpret the __ioremap() phys_addr argument based on
+         * these printed values?
+         */
+        for (i = 0; i < 7; i++) {
+                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
+                ret += trace_seq_printf(s, " %llx",
+                        (unsigned long long)(start |
+                        (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
+        }
+        for (i = 0; i < 7; i++) {
+                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
+                ret += trace_seq_printf(s, " %llx",
+                        dev->resource[i].start < dev->resource[i].end ?
+                        (unsigned long long)(end - start) + 1 : 0);
+        }
+        if (drv)
+                ret += trace_seq_printf(s, " %s\n", drv->name);
+        else
+                ret += trace_seq_printf(s, " \n");
+        return ret;
+}
+
 /* XXX: This is not called for trace_pipe file! */
-void mmio_print_header(struct trace_iterator *iter)
+static void mmio_print_header(struct trace_iterator *iter)
 {
         struct trace_seq *s = &iter->seq;
-        trace_seq_printf(s, "VERSION broken 20070824\n");
-        /* TODO: print /proc/bus/pci/devices contents as PCIDEV lines */
+        struct pci_dev *dev = NULL;
+
+        trace_seq_printf(s, "VERSION 20070824\n");
+
+        for_each_pci_dev(dev)
+                mmio_print_pcidev(s, dev);
+        /* XXX: return value? What if header is very long? */
 }
 
 static int mmio_print_rw(struct trace_iterator *iter)