linux/drivers/s390/cio/qdio_setup.c
Jan Glauber 779e6e1c72 [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>
2008-07-17 17:22:10 +02:00

522 lines
14 KiB
C

/*
* driver/s390/cio/qdio_setup.c
*
* qdio queue initialization
*
* Copyright (C) IBM Corp. 2008
* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/qdio.h>
#include "cio.h"
#include "css.h"
#include "device.h"
#include "ioasm.h"
#include "chsc.h"
#include "qdio.h"
#include "qdio_debug.h"
static struct kmem_cache *qdio_q_cache;
/*
* qebsm is only available under 64bit but the adapter sets the feature
* flag anyway, so we manually override it.
*/
static inline int qebsm_possible(void)
{
#ifdef CONFIG_64BIT
return css_general_characteristics.qebsm;
#endif
return 0;
}
/*
* qib_param_field: pointer to 128 bytes or NULL, if no param field
* nr_input_qs: pointer to nr_queues*128 words of data or NULL
*/
static void set_impl_params(struct qdio_irq *irq_ptr,
unsigned int qib_param_field_format,
unsigned char *qib_param_field,
unsigned long *input_slib_elements,
unsigned long *output_slib_elements)
{
struct qdio_q *q;
int i, j;
if (!irq_ptr)
return;
WARN_ON((unsigned long)&irq_ptr->qib & 0xff);
irq_ptr->qib.pfmt = qib_param_field_format;
if (qib_param_field)
memcpy(irq_ptr->qib.parm, qib_param_field,
QDIO_MAX_BUFFERS_PER_Q);
if (!input_slib_elements)
goto output;
for_each_input_queue(irq_ptr, q, i) {
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
q->slib->slibe[j].parms =
input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
}
output:
if (!output_slib_elements)
return;
for_each_output_queue(irq_ptr, q, i) {
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
q->slib->slibe[j].parms =
output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
}
}
static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
{
struct qdio_q *q;
int i;
for (i = 0; i < nr_queues; i++) {
q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
if (!q)
return -ENOMEM;
WARN_ON((unsigned long)q & 0xff);
q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
if (!q->slib) {
kmem_cache_free(qdio_q_cache, q);
return -ENOMEM;
}
WARN_ON((unsigned long)q->slib & 0x7ff);
irq_ptr_qs[i] = q;
}
return 0;
}
int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
{
int rc;
rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
if (rc)
return rc;
rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
return rc;
}
static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
qdio_handler_t *handler, int i)
{
/* must be cleared by every qdio_establish */
memset(q, 0, ((char *)&q->slib) - ((char *)q));
memset(q->slib, 0, PAGE_SIZE);
q->irq_ptr = irq_ptr;
q->mask = 1 << (31 - i);
q->nr = i;
q->handler = handler;
}
static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
void **sbals_array, char *dbf_text, int i)
{
struct qdio_q *prev;
int j;
QDIO_DBF_TEXT0(0, setup, dbf_text);
QDIO_DBF_HEX0(0, setup, &q, sizeof(void *));
q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
/* fill in sbal */
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
q->sbal[j] = *sbals_array++;
WARN_ON((unsigned long)q->sbal[j] & 0xff);
}
/* fill in slib */
if (i > 0) {
prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
: irq_ptr->output_qs[i - 1];
prev->slib->nsliba = (unsigned long)q->slib;
}
q->slib->sla = (unsigned long)q->sl;
q->slib->slsba = (unsigned long)&q->slsb.val[0];
/* fill in sl */
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
q->sl->element[j].sbal = (unsigned long)q->sbal[j];
QDIO_DBF_TEXT2(0, setup, "sl-sb-b0");
QDIO_DBF_HEX2(0, setup, q->sl, sizeof(void *));
QDIO_DBF_HEX2(0, setup, &q->slsb, sizeof(void *));
QDIO_DBF_HEX2(0, setup, q->sbal, sizeof(void *));
}
static void setup_queues(struct qdio_irq *irq_ptr,
struct qdio_initialize *qdio_init)
{
char dbf_text[20];
struct qdio_q *q;
void **input_sbal_array = qdio_init->input_sbal_addr_array;
void **output_sbal_array = qdio_init->output_sbal_addr_array;
int i;
sprintf(dbf_text, "qfqs%4x", qdio_init->cdev->private->schid.sch_no);
QDIO_DBF_TEXT0(0, setup, dbf_text);
for_each_input_queue(irq_ptr, q, i) {
sprintf(dbf_text, "in-q%4x", i);
setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
q->is_input_q = 1;
spin_lock_init(&q->u.in.lock);
setup_storage_lists(q, irq_ptr, input_sbal_array, dbf_text, i);
input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
if (is_thinint_irq(irq_ptr))
tasklet_init(&q->tasklet, tiqdio_inbound_processing,
(unsigned long) q);
else
tasklet_init(&q->tasklet, qdio_inbound_processing,
(unsigned long) q);
}
for_each_output_queue(irq_ptr, q, i) {
sprintf(dbf_text, "outq%4x", i);
setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
q->is_input_q = 0;
setup_storage_lists(q, irq_ptr, output_sbal_array,
dbf_text, i);
output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
tasklet_init(&q->tasklet, qdio_outbound_processing,
(unsigned long) q);
setup_timer(&q->u.out.timer, (void(*)(unsigned long))
&qdio_outbound_timer, (unsigned long)q);
}
}
static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
{
if (qdioac & AC1_SIGA_INPUT_NEEDED)
irq_ptr->siga_flag.input = 1;
if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
irq_ptr->siga_flag.output = 1;
if (qdioac & AC1_SIGA_SYNC_NEEDED)
irq_ptr->siga_flag.sync = 1;
if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
irq_ptr->siga_flag.no_sync_ti = 1;
if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
irq_ptr->siga_flag.no_sync_out_pci = 1;
if (irq_ptr->siga_flag.no_sync_out_pci &&
irq_ptr->siga_flag.no_sync_ti)
irq_ptr->siga_flag.no_sync_out_ti = 1;
}
static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
unsigned char qdioac, unsigned long token)
{
char dbf_text[15];
if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
goto no_qebsm;
if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
(!(qdioac & AC1_SC_QEBSM_ENABLED)))
goto no_qebsm;
irq_ptr->sch_token = token;
QDIO_DBF_TEXT0(0, setup, "V=V:1");
sprintf(dbf_text, "%8lx", irq_ptr->sch_token);
QDIO_DBF_TEXT0(0, setup, dbf_text);
return;
no_qebsm:
irq_ptr->sch_token = 0;
irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
QDIO_DBF_TEXT0(0, setup, "noV=V");
}
static int __get_ssqd_info(struct qdio_irq *irq_ptr)
{
struct chsc_ssqd_area *ssqd;
int rc;
QDIO_DBF_TEXT0(0, setup, "getssqd");
ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
memset(ssqd, 0, PAGE_SIZE);
ssqd->request = (struct chsc_header) {
.length = 0x0010,
.code = 0x0024,
};
ssqd->first_sch = irq_ptr->schid.sch_no;
ssqd->last_sch = irq_ptr->schid.sch_no;
ssqd->ssid = irq_ptr->schid.ssid;
if (chsc(ssqd))
return -EIO;
rc = chsc_error_from_response(ssqd->response.code);
if (rc)
return rc;
if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
!(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
(ssqd->qdio_ssqd.sch != irq_ptr->schid.sch_no))
return -EINVAL;
memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
sizeof(struct qdio_ssqd_desc));
return 0;
}
void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
{
unsigned char qdioac;
char dbf_text[15];
int rc;
rc = __get_ssqd_info(irq_ptr);
if (rc) {
QDIO_DBF_TEXT2(0, setup, "ssqdasig");
sprintf(dbf_text, "schno%x", irq_ptr->schid.sch_no);
QDIO_DBF_TEXT2(0, setup, dbf_text);
sprintf(dbf_text, "rc:%d", rc);
QDIO_DBF_TEXT2(0, setup, dbf_text);
/* all flags set, worst case */
qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
AC1_SIGA_SYNC_NEEDED;
} else
qdioac = irq_ptr->ssqd_desc.qdioac1;
check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
process_ac_flags(irq_ptr, qdioac);
sprintf(dbf_text, "qdioac%2x", qdioac);
QDIO_DBF_TEXT2(0, setup, dbf_text);
}
void qdio_release_memory(struct qdio_irq *irq_ptr)
{
struct qdio_q *q;
int i;
/*
* Must check queue array manually since irq_ptr->nr_input_queues /
* irq_ptr->nr_input_queues may not yet be set.
*/
for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
q = irq_ptr->input_qs[i];
if (q) {
free_page((unsigned long) q->slib);
kmem_cache_free(qdio_q_cache, q);
}
}
for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
q = irq_ptr->output_qs[i];
if (q) {
free_page((unsigned long) q->slib);
kmem_cache_free(qdio_q_cache, q);
}
}
kfree(irq_ptr->qdr);
free_page(irq_ptr->chsc_page);
free_page((unsigned long) irq_ptr);
}
static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
struct qdio_q **irq_ptr_qs,
int i, int nr)
{
irq_ptr->qdr->qdf0[i + nr].sliba =
(unsigned long)irq_ptr_qs[i]->slib;
irq_ptr->qdr->qdf0[i + nr].sla =
(unsigned long)irq_ptr_qs[i]->sl;
irq_ptr->qdr->qdf0[i + nr].slsba =
(unsigned long)&irq_ptr_qs[i]->slsb.val[0];
irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY;
irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY;
irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY;
irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY;
}
static void setup_qdr(struct qdio_irq *irq_ptr,
struct qdio_initialize *qdio_init)
{
int i;
irq_ptr->qdr->qfmt = qdio_init->q_format;
irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY;
for (i = 0; i < qdio_init->no_input_qs; i++)
__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
for (i = 0; i < qdio_init->no_output_qs; i++)
__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
qdio_init->no_input_qs);
}
static void setup_qib(struct qdio_irq *irq_ptr,
struct qdio_initialize *init_data)
{
if (qebsm_possible())
irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
irq_ptr->qib.qfmt = init_data->q_format;
if (init_data->no_input_qs)
irq_ptr->qib.isliba =
(unsigned long)(irq_ptr->input_qs[0]->slib);
if (init_data->no_output_qs)
irq_ptr->qib.osliba =
(unsigned long)(irq_ptr->output_qs[0]->slib);
memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
}
int qdio_setup_irq(struct qdio_initialize *init_data)
{
struct ciw *ciw;
struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
int rc;
memset(irq_ptr, 0, ((char *)&irq_ptr->qdr) - ((char *)irq_ptr));
/* wipes qib.ac, required by ar7063 */
memset(irq_ptr->qdr, 0, sizeof(struct qdr));
irq_ptr->int_parm = init_data->int_parm;
irq_ptr->nr_input_qs = init_data->no_input_qs;
irq_ptr->nr_output_qs = init_data->no_output_qs;
irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
irq_ptr->cdev = init_data->cdev;
setup_queues(irq_ptr, init_data);
setup_qib(irq_ptr, init_data);
qdio_setup_thinint(irq_ptr);
set_impl_params(irq_ptr, init_data->qib_param_field_format,
init_data->qib_param_field,
init_data->input_slib_elements,
init_data->output_slib_elements);
/* fill input and output descriptors */
setup_qdr(irq_ptr, init_data);
/* qdr, qib, sls, slsbs, slibs, sbales are filled now */
/* get qdio commands */
ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
if (!ciw) {
QDIO_DBF_TEXT2(1, setup, "no eq");
rc = -EINVAL;
goto out_err;
}
irq_ptr->equeue = *ciw;
ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
if (!ciw) {
QDIO_DBF_TEXT2(1, setup, "no aq");
rc = -EINVAL;
goto out_err;
}
irq_ptr->aqueue = *ciw;
/* set new interrupt handler */
irq_ptr->orig_handler = init_data->cdev->handler;
init_data->cdev->handler = qdio_int_handler;
return 0;
out_err:
qdio_release_memory(irq_ptr);
return rc;
}
void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
struct ccw_device *cdev)
{
char s[80];
sprintf(s, "%s ", cdev->dev.bus_id);
switch (irq_ptr->qib.qfmt) {
case QDIO_QETH_QFMT:
sprintf(s + strlen(s), "OSADE ");
break;
case QDIO_ZFCP_QFMT:
sprintf(s + strlen(s), "ZFCP ");
break;
case QDIO_IQDIO_QFMT:
sprintf(s + strlen(s), "HiperSockets ");
break;
}
sprintf(s + strlen(s), "using: ");
if (!is_thinint_irq(irq_ptr))
sprintf(s + strlen(s), "no");
sprintf(s + strlen(s), "AdapterInterrupts ");
if (!(irq_ptr->sch_token != 0))
sprintf(s + strlen(s), "no");
sprintf(s + strlen(s), "QEBSM ");
if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
sprintf(s + strlen(s), "no");
sprintf(s + strlen(s), "OutboundPCI ");
if (!css_general_characteristics.aif_tdd)
sprintf(s + strlen(s), "no");
sprintf(s + strlen(s), "TDD\n");
printk(KERN_INFO "qdio: %s", s);
memset(s, 0, sizeof(s));
sprintf(s, "%s SIGA required: ", cdev->dev.bus_id);
if (irq_ptr->siga_flag.input)
sprintf(s + strlen(s), "Read ");
if (irq_ptr->siga_flag.output)
sprintf(s + strlen(s), "Write ");
if (irq_ptr->siga_flag.sync)
sprintf(s + strlen(s), "Sync ");
if (!irq_ptr->siga_flag.no_sync_ti)
sprintf(s + strlen(s), "SyncAI ");
if (!irq_ptr->siga_flag.no_sync_out_ti)
sprintf(s + strlen(s), "SyncOutAI ");
if (!irq_ptr->siga_flag.no_sync_out_pci)
sprintf(s + strlen(s), "SyncOutPCI");
sprintf(s + strlen(s), "\n");
printk(KERN_INFO "qdio: %s", s);
}
int __init qdio_setup_init(void)
{
char dbf_text[15];
qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
256, 0, NULL);
if (!qdio_q_cache)
return -ENOMEM;
/* Check for OSA/FCP thin interrupts (bit 67). */
sprintf(dbf_text, "thini%1x",
(css_general_characteristics.aif_osa) ? 1 : 0);
QDIO_DBF_TEXT0(0, setup, dbf_text);
/* Check for QEBSM support in general (bit 58). */
sprintf(dbf_text, "cssQBS:%1x",
(qebsm_possible()) ? 1 : 0);
QDIO_DBF_TEXT0(0, setup, dbf_text);
return 0;
}
void __exit qdio_setup_exit(void)
{
kmem_cache_destroy(qdio_q_cache);
}