[S390] qdio: new qdio driver.

List of major changes:
- split qdio driver into several files
- seperation of thin interrupt code
- improved handling for multiple thin interrupt devices
- inbound and outbound processing now always runs in tasklet context
- significant less tasklet schedules per interrupt needed
- merged qebsm with non-qebsm handling
- cleanup qdio interface and added kerneldoc
- coding style

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Utz Bacher <utz.bacher@de.ibm.com>
Reviewed-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 151 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio_perf.c b/drivers/s390/cio/qdio_perf.c
new file mode 100644
index 0000000..ea01b85
--- /dev/null
+++ b/drivers/s390/cio/qdio_perf.c
@@ -0,0 +1,151 @@
+/*
+ *  drivers/s390/cio/qdio_perf.c
+ *
+ *  Copyright IBM Corp. 2008
+ *
+ *  Author: Jan Glauber (jang@linux.vnet.ibm.com)
+ */
+#include <linux/kernel.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/ccwdev.h>
+
+#include "cio.h"
+#include "css.h"
+#include "device.h"
+#include "ioasm.h"
+#include "chsc.h"
+#include "qdio_debug.h"
+#include "qdio_perf.h"
+
+int qdio_performance_stats;
+struct qdio_perf_stats perf_stats;
+
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry *qdio_perf_pde;
+#endif
+
+inline void qdio_perf_stat_inc(atomic_long_t *count)
+{
+	if (qdio_performance_stats)
+		atomic_long_inc(count);
+}
+
+inline void qdio_perf_stat_dec(atomic_long_t *count)
+{
+	if (qdio_performance_stats)
+		atomic_long_dec(count);
+}
+
+/*
+ * procfs functions
+ */
+static int qdio_perf_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "Number of qdio interrupts\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.qdio_int));
+	seq_printf(m, "Number of PCI interrupts\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.pci_int));
+	seq_printf(m, "Number of adapter interrupts\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.thin_int));
+	seq_printf(m, "\n");
+	seq_printf(m, "Inbound tasklet runs\t\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.tasklet_inbound));
+	seq_printf(m, "Outbound tasklet runs\t\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.tasklet_outbound));
+	seq_printf(m, "Adapter interrupt tasklet runs/loops\t\t: %li/%li\n",
+		   (long)atomic_long_read(&perf_stats.tasklet_thinint),
+		   (long)atomic_long_read(&perf_stats.tasklet_thinint_loop));
+	seq_printf(m, "Adapter interrupt inbound tasklet runs/loops\t: %li/%li\n",
+		   (long)atomic_long_read(&perf_stats.thinint_inbound),
+		   (long)atomic_long_read(&perf_stats.thinint_inbound_loop));
+	seq_printf(m, "\n");
+	seq_printf(m, "Number of SIGA In issued\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.siga_in));
+	seq_printf(m, "Number of SIGA Out issued\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.siga_out));
+	seq_printf(m, "Number of SIGA Sync issued\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.siga_sync));
+	seq_printf(m, "\n");
+	seq_printf(m, "Number of inbound transfers\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.inbound_handler));
+	seq_printf(m, "Number of outbound transfers\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.outbound_handler));
+	seq_printf(m, "\n");
+	seq_printf(m, "Number of fast requeues (outg. SBAL w/o SIGA)\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.fast_requeue));
+	seq_printf(m, "Number of outbound tasklet mod_timer calls\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.debug_tl_out_timer));
+	seq_printf(m, "Number of stop polling calls\t\t\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.debug_stop_polling));
+	seq_printf(m, "AI inbound tasklet loops after stop polling\t: %li\n",
+		   (long)atomic_long_read(&perf_stats.thinint_inbound_loop2));
+	seq_printf(m, "\n");
+	return 0;
+}
+static int qdio_perf_seq_open(struct inode *inode, struct file *filp)
+{
+	return single_open(filp, qdio_perf_proc_show, NULL);
+}
+
+static struct file_operations qdio_perf_proc_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = qdio_perf_seq_open,
+	.read	 = seq_read,
+	.llseek  = seq_lseek,
+	.release = single_release,
+};
+
+/*
+ * sysfs functions
+ */
+static ssize_t qdio_perf_stats_show(struct bus_type *bus, char *buf)
+{
+	return sprintf(buf, "%i\n", qdio_performance_stats ? 1 : 0);
+}
+
+static ssize_t qdio_perf_stats_store(struct bus_type *bus,
+			      const char *buf, size_t count)
+{
+	unsigned long i;
+
+	if (strict_strtoul(buf, 16, &i) != 0)
+		return -EINVAL;
+	if ((i != 0) && (i != 1))
+		return -EINVAL;
+	if (i == qdio_performance_stats)
+		return count;
+
+	qdio_performance_stats = i;
+	/* reset performance statistics */
+	if (i == 0)
+		memset(&perf_stats, 0, sizeof(struct qdio_perf_stats));
+	return count;
+}
+
+static BUS_ATTR(qdio_performance_stats, 0644, qdio_perf_stats_show,
+		qdio_perf_stats_store);
+
+int __init qdio_setup_perf_stats(void)
+{
+	int rc;
+
+	rc = bus_create_file(&ccw_bus_type, &bus_attr_qdio_performance_stats);
+	if (rc)
+		return rc;
+
+#ifdef CONFIG_PROC_FS
+	memset(&perf_stats, 0, sizeof(struct qdio_perf_stats));
+	qdio_perf_pde = proc_create("qdio_perf", S_IFREG | S_IRUGO,
+				    NULL, &qdio_perf_proc_fops);
+#endif
+	return 0;
+}
+
+void __exit qdio_remove_perf_stats(void)
+{
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry("qdio_perf", NULL);
+#endif
+	bus_remove_file(&ccw_bus_type, &bus_attr_qdio_performance_stats);
+}