[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>
diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
new file mode 100644
index 0000000..9291a77
--- /dev/null
+++ b/drivers/s390/cio/qdio_thinint.c
@@ -0,0 +1,380 @@
+/*
+ * linux/drivers/s390/cio/thinint_qdio.c
+ *
+ * thin interrupt support for qdio
+ *
+ * Copyright 2000-2008 IBM Corp.
+ * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
+ * Cornelia Huck <cornelia.huck@de.ibm.com>
+ * Jan Glauber <jang@linux.vnet.ibm.com>
+ */
+#include <linux/io.h>
+#include <asm/atomic.h>
+#include <asm/debug.h>
+#include <asm/qdio.h>
+#include <asm/airq.h>
+#include <asm/isc.h>
+
+#include "cio.h"
+#include "ioasm.h"
+#include "qdio.h"
+#include "qdio_debug.h"
+#include "qdio_perf.h"
+
+/*
+ * Restriction: only 63 iqdio subchannels would have its own indicator,
+ * after that, subsequent subchannels share one indicator
+ */
+#define TIQDIO_NR_NONSHARED_IND 63
+#define TIQDIO_NR_INDICATORS (TIQDIO_NR_NONSHARED_IND + 1)
+#define TIQDIO_SHARED_IND 63
+
+/* list of thin interrupt input queues */
+static LIST_HEAD(tiq_list);
+
+/* adapter local summary indicator */
+static unsigned char *tiqdio_alsi;
+
+/* device state change indicators */
+struct indicator_t {
+ u32 ind; /* u32 because of compare-and-swap performance */
+ atomic_t count; /* use count, 0 or 1 for non-shared indicators */
+};
+static struct indicator_t *q_indicators;
+
+static void tiqdio_tasklet_fn(unsigned long data);
+static DECLARE_TASKLET(tiqdio_tasklet, tiqdio_tasklet_fn, 0);
+
+static int css_qdio_omit_svs;
+
+static inline unsigned long do_clear_global_summary(void)
+{
+ register unsigned long __fn asm("1") = 3;
+ register unsigned long __tmp asm("2");
+ register unsigned long __time asm("3");
+
+ asm volatile(
+ " .insn rre,0xb2650000,2,0"
+ : "+d" (__fn), "=d" (__tmp), "=d" (__time));
+ return __time;
+}
+
+/* returns addr for the device state change indicator */
+static u32 *get_indicator(void)
+{
+ int i;
+
+ for (i = 0; i < TIQDIO_NR_NONSHARED_IND; i++)
+ if (!atomic_read(&q_indicators[i].count)) {
+ atomic_set(&q_indicators[i].count, 1);
+ return &q_indicators[i].ind;
+ }
+
+ /* use the shared indicator */
+ atomic_inc(&q_indicators[TIQDIO_SHARED_IND].count);
+ return &q_indicators[TIQDIO_SHARED_IND].ind;
+}
+
+static void put_indicator(u32 *addr)
+{
+ int i;
+
+ if (!addr)
+ return;
+ i = ((unsigned long)addr - (unsigned long)q_indicators) /
+ sizeof(struct indicator_t);
+ atomic_dec(&q_indicators[i].count);
+}
+
+void tiqdio_add_input_queues(struct qdio_irq *irq_ptr)
+{
+ struct qdio_q *q;
+ int i;
+
+ /* No TDD facility? If we must use SIGA-s we can also omit SVS. */
+ if (!css_qdio_omit_svs && irq_ptr->siga_flag.sync)
+ css_qdio_omit_svs = 1;
+
+ for_each_input_queue(irq_ptr, q, i) {
+ list_add_rcu(&q->entry, &tiq_list);
+ synchronize_rcu();
+ }
+ xchg(irq_ptr->dsci, 1);
+ tasklet_schedule(&tiqdio_tasklet);
+}
+
+/*
+ * we cannot stop the tiqdio tasklet here since it is for all
+ * thinint qdio devices and it must run as long as there is a
+ * thinint device left
+ */
+void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)
+{
+ struct qdio_q *q;
+ int i;
+
+ for_each_input_queue(irq_ptr, q, i) {
+ list_del_rcu(&q->entry);
+ synchronize_rcu();
+ }
+}
+
+static inline int tiqdio_inbound_q_done(struct qdio_q *q)
+{
+ unsigned char state;
+
+ if (!atomic_read(&q->nr_buf_used))
+ return 1;
+
+ qdio_siga_sync_q(q);
+ get_buf_state(q, q->first_to_check, &state);
+
+ if (state == SLSB_P_INPUT_PRIMED)
+ /* more work coming */
+ return 0;
+ return 1;
+}
+
+static inline int shared_ind(struct qdio_irq *irq_ptr)
+{
+ return irq_ptr->dsci == &q_indicators[TIQDIO_SHARED_IND].ind;
+}
+
+static void __tiqdio_inbound_processing(struct qdio_q *q)
+{
+ qdio_perf_stat_inc(&perf_stats.thinint_inbound);
+ qdio_sync_after_thinint(q);
+
+ /*
+ * Maybe we have work on our outbound queues... at least
+ * we have to check the PCI capable queues.
+ */
+ qdio_check_outbound_after_thinint(q);
+
+again:
+ if (!qdio_inbound_q_moved(q))
+ return;
+
+ qdio_kick_inbound_handler(q);
+
+ if (!tiqdio_inbound_q_done(q)) {
+ qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop);
+ goto again;
+ }
+
+ qdio_stop_polling(q);
+ /*
+ * We need to check again to not lose initiative after
+ * resetting the ACK state.
+ */
+ if (!tiqdio_inbound_q_done(q)) {
+ qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2);
+ goto again;
+ }
+}
+
+void tiqdio_inbound_processing(unsigned long data)
+{
+ struct qdio_q *q = (struct qdio_q *)data;
+
+ __tiqdio_inbound_processing(q);
+}
+
+/* check for work on all inbound thinint queues */
+static void tiqdio_tasklet_fn(unsigned long data)
+{
+ struct qdio_q *q;
+
+ qdio_perf_stat_inc(&perf_stats.tasklet_thinint);
+again:
+
+ /* protect tiq_list entries, only changed in activate or shutdown */
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(q, &tiq_list, entry)
+ /* only process queues from changed sets */
+ if (*q->irq_ptr->dsci) {
+
+ /* only clear it if the indicator is non-shared */
+ if (!shared_ind(q->irq_ptr))
+ xchg(q->irq_ptr->dsci, 0);
+ /*
+ * don't call inbound processing directly since
+ * that could starve other thinint queues
+ */
+ tasklet_schedule(&q->tasklet);
+ }
+
+ rcu_read_unlock();
+
+ /*
+ * if we used the shared indicator clear it now after all queues
+ * were processed
+ */
+ if (atomic_read(&q_indicators[TIQDIO_SHARED_IND].count)) {
+ xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 0);
+
+ /* prevent racing */
+ if (*tiqdio_alsi)
+ xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 1);
+ }
+
+ /* check for more work */
+ if (*tiqdio_alsi) {
+ xchg(tiqdio_alsi, 0);
+ qdio_perf_stat_inc(&perf_stats.tasklet_thinint_loop);
+ goto again;
+ }
+}
+
+/**
+ * tiqdio_thinint_handler - thin interrupt handler for qdio
+ * @ind: pointer to adapter local summary indicator
+ * @drv_data: NULL
+ */
+static void tiqdio_thinint_handler(void *ind, void *drv_data)
+{
+ qdio_perf_stat_inc(&perf_stats.thin_int);
+
+ /*
+ * SVS only when needed: issue SVS to benefit from iqdio interrupt
+ * avoidance (SVS clears adapter interrupt suppression overwrite)
+ */
+ if (!css_qdio_omit_svs)
+ do_clear_global_summary();
+
+ /*
+ * reset local summary indicator (tiqdio_alsi) to stop adapter
+ * interrupts for now, the tasklet will clean all dsci's
+ */
+ xchg((u8 *)ind, 0);
+ tasklet_hi_schedule(&tiqdio_tasklet);
+}
+
+static int set_subchannel_ind(struct qdio_irq *irq_ptr, int reset)
+{
+ struct scssc_area *scssc_area;
+ char dbf_text[15];
+ void *ptr;
+ int rc;
+
+ scssc_area = (struct scssc_area *)irq_ptr->chsc_page;
+ memset(scssc_area, 0, PAGE_SIZE);
+
+ if (reset) {
+ scssc_area->summary_indicator_addr = 0;
+ scssc_area->subchannel_indicator_addr = 0;
+ } else {
+ scssc_area->summary_indicator_addr = virt_to_phys(tiqdio_alsi);
+ scssc_area->subchannel_indicator_addr =
+ virt_to_phys(irq_ptr->dsci);
+ }
+
+ scssc_area->request = (struct chsc_header) {
+ .length = 0x0fe0,
+ .code = 0x0021,
+ };
+ scssc_area->operation_code = 0;
+ scssc_area->ks = PAGE_DEFAULT_KEY;
+ scssc_area->kc = PAGE_DEFAULT_KEY;
+ scssc_area->isc = QDIO_AIRQ_ISC;
+ scssc_area->schid = irq_ptr->schid;
+
+ /* enable the time delay disablement facility */
+ if (css_general_characteristics.aif_tdd)
+ scssc_area->word_with_d_bit = 0x10000000;
+
+ rc = chsc(scssc_area);
+ if (rc)
+ return -EIO;
+
+ rc = chsc_error_from_response(scssc_area->response.code);
+ if (rc) {
+ sprintf(dbf_text, "sidR%4x", scssc_area->response.code);
+ QDIO_DBF_TEXT1(0, trace, dbf_text);
+ QDIO_DBF_TEXT1(0, setup, dbf_text);
+ ptr = &scssc_area->response;
+ QDIO_DBF_HEX2(1, setup, &ptr, QDIO_DBF_SETUP_LEN);
+ return rc;
+ }
+
+ QDIO_DBF_TEXT2(0, setup, "setscind");
+ QDIO_DBF_HEX2(0, setup, &scssc_area->summary_indicator_addr,
+ sizeof(unsigned long));
+ QDIO_DBF_HEX2(0, setup, &scssc_area->subchannel_indicator_addr,
+ sizeof(unsigned long));
+ return 0;
+}
+
+/* allocate non-shared indicators and shared indicator */
+int __init tiqdio_allocate_memory(void)
+{
+ q_indicators = kzalloc(sizeof(struct indicator_t) * TIQDIO_NR_INDICATORS,
+ GFP_KERNEL);
+ if (!q_indicators)
+ return -ENOMEM;
+ return 0;
+}
+
+void tiqdio_free_memory(void)
+{
+ kfree(q_indicators);
+}
+
+int __init tiqdio_register_thinints(void)
+{
+ char dbf_text[20];
+
+ isc_register(QDIO_AIRQ_ISC);
+ tiqdio_alsi = s390_register_adapter_interrupt(&tiqdio_thinint_handler,
+ NULL, QDIO_AIRQ_ISC);
+ if (IS_ERR(tiqdio_alsi)) {
+ sprintf(dbf_text, "regthn%lx", PTR_ERR(tiqdio_alsi));
+ QDIO_DBF_TEXT0(0, setup, dbf_text);
+ tiqdio_alsi = NULL;
+ isc_unregister(QDIO_AIRQ_ISC);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+int qdio_establish_thinint(struct qdio_irq *irq_ptr)
+{
+ if (!is_thinint_irq(irq_ptr))
+ return 0;
+
+ /* Check for aif time delay disablement. If installed,
+ * omit SVS even under LPAR
+ */
+ if (css_general_characteristics.aif_tdd)
+ css_qdio_omit_svs = 1;
+ return set_subchannel_ind(irq_ptr, 0);
+}
+
+void qdio_setup_thinint(struct qdio_irq *irq_ptr)
+{
+ if (!is_thinint_irq(irq_ptr))
+ return;
+ irq_ptr->dsci = get_indicator();
+ QDIO_DBF_HEX1(0, setup, &irq_ptr->dsci, sizeof(void *));
+}
+
+void qdio_shutdown_thinint(struct qdio_irq *irq_ptr)
+{
+ if (!is_thinint_irq(irq_ptr))
+ return;
+
+ /* reset adapter interrupt indicators */
+ put_indicator(irq_ptr->dsci);
+ set_subchannel_ind(irq_ptr, 1);
+}
+
+void __exit tiqdio_unregister_thinints(void)
+{
+ tasklet_disable(&tiqdio_tasklet);
+
+ if (tiqdio_alsi) {
+ s390_unregister_adapter_interrupt(tiqdio_alsi, QDIO_AIRQ_ISC);
+ isc_unregister(QDIO_AIRQ_ISC);
+ }
+}