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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/s390/pci/pci_debug.c
Initial import
Diffstat (limited to 'arch/s390/pci/pci_debug.c')
-rw-r--r--arch/s390/pci/pci_debug.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/s390/pci/pci_debug.c b/arch/s390/pci/pci_debug.c
new file mode 100644
index 000000000..4129b0a5f
--- /dev/null
+++ b/arch/s390/pci/pci_debug.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright IBM Corp. 2012
+ *
+ * Author(s):
+ * Jan Glauber <jang@linux.vnet.ibm.com>
+ */
+
+#define KMSG_COMPONENT "zpci"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
+#include <linux/export.h>
+#include <linux/pci.h>
+#include <asm/debug.h>
+
+#include <asm/pci_dma.h>
+
+static struct dentry *debugfs_root;
+debug_info_t *pci_debug_msg_id;
+EXPORT_SYMBOL_GPL(pci_debug_msg_id);
+debug_info_t *pci_debug_err_id;
+EXPORT_SYMBOL_GPL(pci_debug_err_id);
+
+static char *pci_perf_names[] = {
+ /* hardware counters */
+ "Load operations",
+ "Store operations",
+ "Store block operations",
+ "Refresh operations",
+ "DMA read bytes",
+ "DMA write bytes",
+};
+
+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;
+ u64 *stat;
+ int i;
+
+ if (!zdev)
+ return 0;
+
+ mutex_lock(&zdev->lock);
+ if (!zdev->fmb) {
+ mutex_unlock(&zdev->lock);
+ seq_puts(m, "FMB statistics disabled\n");
+ return 0;
+ }
+
+ /* header */
+ seq_printf(m, "FMB @ %p\n", zdev->fmb);
+ seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
+ seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
+ seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
+
+ /* hardware counters */
+ stat = (u64 *) &zdev->fmb->ld_ops;
+ for (i = 0; i < 4; i++)
+ seq_printf(m, "%26s:\t%llu\n",
+ pci_perf_names[i], *(stat + i));
+ if (zdev->fmb->dma_valid)
+ for (i = 4; i < 6; i++)
+ seq_printf(m, "%26s:\t%llu\n",
+ pci_perf_names[i], *(stat + i));
+
+ pci_sw_counter_show(m);
+ mutex_unlock(&zdev->lock);
+ return 0;
+}
+
+static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *off)
+{
+ struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
+ unsigned long val;
+ int rc;
+
+ if (!zdev)
+ return 0;
+
+ rc = kstrtoul_from_user(ubuf, count, 10, &val);
+ if (rc)
+ return rc;
+
+ mutex_lock(&zdev->lock);
+ switch (val) {
+ case 0:
+ rc = zpci_fmb_disable_device(zdev);
+ break;
+ case 1:
+ rc = zpci_fmb_enable_device(zdev);
+ break;
+ }
+ mutex_unlock(&zdev->lock);
+ return rc ? rc : count;
+}
+
+static int pci_perf_seq_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, pci_perf_show,
+ file_inode(filp)->i_private);
+}
+
+static const struct file_operations debugfs_pci_perf_fops = {
+ .open = pci_perf_seq_open,
+ .read = seq_read,
+ .write = pci_perf_seq_write,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+void zpci_debug_init_device(struct zpci_dev *zdev)
+{
+ zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
+ debugfs_root);
+ if (IS_ERR(zdev->debugfs_dev))
+ zdev->debugfs_dev = NULL;
+
+ zdev->debugfs_perf = debugfs_create_file("statistics",
+ S_IFREG | S_IRUGO | S_IWUSR,
+ zdev->debugfs_dev, zdev,
+ &debugfs_pci_perf_fops);
+ if (IS_ERR(zdev->debugfs_perf))
+ zdev->debugfs_perf = NULL;
+}
+
+void zpci_debug_exit_device(struct zpci_dev *zdev)
+{
+ debugfs_remove(zdev->debugfs_perf);
+ debugfs_remove(zdev->debugfs_dev);
+}
+
+int __init zpci_debug_init(void)
+{
+ /* event trace buffer */
+ pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
+ if (!pci_debug_msg_id)
+ return -EINVAL;
+ debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
+ debug_set_level(pci_debug_msg_id, 3);
+
+ /* error log */
+ pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
+ if (!pci_debug_err_id)
+ return -EINVAL;
+ debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
+ debug_set_level(pci_debug_err_id, 6);
+
+ debugfs_root = debugfs_create_dir("pci", NULL);
+ return 0;
+}
+
+void zpci_debug_exit(void)
+{
+ debug_unregister(pci_debug_msg_id);
+ debug_unregister(pci_debug_err_id);
+ debugfs_remove(debugfs_root);
+}