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Diffstat (limited to 'arch/s390/pci/pci_debug.c')
-rw-r--r--arch/s390/pci/pci_debug.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/arch/s390/pci/pci_debug.c b/arch/s390/pci/pci_debug.c
index c22d4402ae45..4129b0a5fd78 100644
--- a/arch/s390/pci/pci_debug.c
+++ b/arch/s390/pci/pci_debug.c
@@ -31,12 +31,25 @@ static char *pci_perf_names[] = {
"Refresh operations",
"DMA read bytes",
"DMA write bytes",
- /* software counters */
+};
+
+static char *pci_sw_names[] = {
"Allocated pages",
"Mapped pages",
"Unmapped pages",
};
+static void pci_sw_counter_show(struct seq_file *m)
+{
+ struct zpci_dev *zdev = m->private;
+ atomic64_t *counter = &zdev->allocated_pages;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
+ seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
+ atomic64_read(counter));
+}
+
static int pci_perf_show(struct seq_file *m, void *v)
{
struct zpci_dev *zdev = m->private;
@@ -45,7 +58,10 @@ static int pci_perf_show(struct seq_file *m, void *v)
if (!zdev)
return 0;
+
+ mutex_lock(&zdev->lock);
if (!zdev->fmb) {
+ mutex_unlock(&zdev->lock);
seq_puts(m, "FMB statistics disabled\n");
return 0;
}
@@ -65,12 +81,9 @@ static int pci_perf_show(struct seq_file *m, void *v)
for (i = 4; i < 6; i++)
seq_printf(m, "%26s:\t%llu\n",
pci_perf_names[i], *(stat + i));
- /* software counters */
- for (i = 6; i < ARRAY_SIZE(pci_perf_names); i++)
- seq_printf(m, "%26s:\t%llu\n",
- pci_perf_names[i],
- atomic64_read((atomic64_t *) (stat + i)));
+ pci_sw_counter_show(m);
+ mutex_unlock(&zdev->lock);
return 0;
}
@@ -88,19 +101,17 @@ static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
if (rc)
return rc;
+ mutex_lock(&zdev->lock);
switch (val) {
case 0:
rc = zpci_fmb_disable_device(zdev);
- if (rc)
- return rc;
break;
case 1:
rc = zpci_fmb_enable_device(zdev);
- if (rc)
- return rc;
break;
}
- return count;
+ mutex_unlock(&zdev->lock);
+ return rc ? rc : count;
}
static int pci_perf_seq_open(struct inode *inode, struct file *filp)