438 lines
11 KiB
C
438 lines
11 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* qdio queue initialization
|
||
|
|
*
|
||
|
|
* Copyright IBM Corp. 2008
|
||
|
|
* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
|
||
|
|
*/
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/export.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
|
||
|
|
#include <asm/ebcdic.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"
|
||
|
|
|
||
|
|
#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
|
||
|
|
|
||
|
|
static struct kmem_cache *qdio_q_cache;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* qdio_free_buffers() - free qdio buffers
|
||
|
|
* @buf: array of pointers to qdio buffers
|
||
|
|
* @count: number of qdio buffers to free
|
||
|
|
*/
|
||
|
|
void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
|
||
|
|
{
|
||
|
|
int pos;
|
||
|
|
|
||
|
|
for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
|
||
|
|
free_page((unsigned long) buf[pos]);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(qdio_free_buffers);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* qdio_alloc_buffers() - allocate qdio buffers
|
||
|
|
* @buf: array of pointers to qdio buffers
|
||
|
|
* @count: number of qdio buffers to allocate
|
||
|
|
*/
|
||
|
|
int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
|
||
|
|
{
|
||
|
|
int pos;
|
||
|
|
|
||
|
|
for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
|
||
|
|
buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
|
||
|
|
if (!buf[pos]) {
|
||
|
|
qdio_free_buffers(buf, count);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for (pos = 0; pos < count; pos++)
|
||
|
|
if (pos % QBUFF_PER_PAGE)
|
||
|
|
buf[pos] = buf[pos - 1] + 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* qdio_reset_buffers() - reset qdio buffers
|
||
|
|
* @buf: array of pointers to qdio buffers
|
||
|
|
* @count: number of qdio buffers that will be zeroed
|
||
|
|
*/
|
||
|
|
void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
|
||
|
|
{
|
||
|
|
int pos;
|
||
|
|
|
||
|
|
for (pos = 0; pos < count; pos++)
|
||
|
|
memset(buf[pos], 0, sizeof(struct qdio_buffer));
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(qdio_reset_buffers);
|
||
|
|
|
||
|
|
static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)
|
||
|
|
{
|
||
|
|
struct qdio_q *q;
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
for (i = 0; i < count; i++) {
|
||
|
|
q = queues[i];
|
||
|
|
free_page((unsigned long) q->slib);
|
||
|
|
kmem_cache_free(qdio_q_cache, q);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void qdio_free_queues(struct qdio_irq *irq_ptr)
|
||
|
|
{
|
||
|
|
__qdio_free_queues(irq_ptr->input_qs, irq_ptr->max_input_qs);
|
||
|
|
irq_ptr->max_input_qs = 0;
|
||
|
|
|
||
|
|
__qdio_free_queues(irq_ptr->output_qs, irq_ptr->max_output_qs);
|
||
|
|
irq_ptr->max_output_qs = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
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_zalloc(qdio_q_cache, GFP_KERNEL);
|
||
|
|
if (!q) {
|
||
|
|
__qdio_free_queues(irq_ptr_qs, i);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
|
||
|
|
if (!q->slib) {
|
||
|
|
kmem_cache_free(qdio_q_cache, q);
|
||
|
|
__qdio_free_queues(irq_ptr_qs, i);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
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);
|
||
|
|
if (rc) {
|
||
|
|
__qdio_free_queues(irq_ptr->input_qs, nr_input_qs);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
irq_ptr->max_input_qs = nr_input_qs;
|
||
|
|
irq_ptr->max_output_qs = nr_output_qs;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
|
||
|
|
qdio_handler_t *handler, int i)
|
||
|
|
{
|
||
|
|
struct slib *slib = q->slib;
|
||
|
|
|
||
|
|
/* queue must be cleared for qdio_establish */
|
||
|
|
memset(q, 0, sizeof(*q));
|
||
|
|
memset(slib, 0, PAGE_SIZE);
|
||
|
|
q->slib = slib;
|
||
|
|
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,
|
||
|
|
struct qdio_buffer **sbals_array, int i)
|
||
|
|
{
|
||
|
|
struct qdio_q *prev;
|
||
|
|
int j;
|
||
|
|
|
||
|
|
DBF_HEX(&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++;
|
||
|
|
|
||
|
|
/* 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 = virt_to_phys(q->sbal[j]);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void setup_queues(struct qdio_irq *irq_ptr,
|
||
|
|
struct qdio_initialize *qdio_init)
|
||
|
|
{
|
||
|
|
struct qdio_q *q;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for_each_input_queue(irq_ptr, q, i) {
|
||
|
|
DBF_EVENT("inq:%1d", i);
|
||
|
|
setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
|
||
|
|
|
||
|
|
q->is_input_q = 1;
|
||
|
|
|
||
|
|
setup_storage_lists(q, irq_ptr,
|
||
|
|
qdio_init->input_sbal_addr_array[i], i);
|
||
|
|
}
|
||
|
|
|
||
|
|
for_each_output_queue(irq_ptr, q, i) {
|
||
|
|
DBF_EVENT("outq:%1d", i);
|
||
|
|
setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
|
||
|
|
|
||
|
|
q->is_input_q = 0;
|
||
|
|
setup_storage_lists(q, irq_ptr,
|
||
|
|
qdio_init->output_sbal_addr_array[i], i);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
|
||
|
|
unsigned char qdioac, unsigned long token)
|
||
|
|
{
|
||
|
|
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;
|
||
|
|
|
||
|
|
DBF_EVENT("V=V:1");
|
||
|
|
DBF_EVENT("%8lx", irq_ptr->sch_token);
|
||
|
|
return;
|
||
|
|
|
||
|
|
no_qebsm:
|
||
|
|
irq_ptr->sch_token = 0;
|
||
|
|
irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
|
||
|
|
DBF_EVENT("noV=V");
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If there is a qdio_irq we use the chsc_page and store the information
|
||
|
|
* in the qdio_irq, otherwise we copy it to the specified structure.
|
||
|
|
*/
|
||
|
|
int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
|
||
|
|
struct subchannel_id *schid,
|
||
|
|
struct qdio_ssqd_desc *data)
|
||
|
|
{
|
||
|
|
struct chsc_ssqd_area *ssqd;
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
DBF_EVENT("getssqd:%4x", schid->sch_no);
|
||
|
|
if (!irq_ptr) {
|
||
|
|
ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
|
||
|
|
if (!ssqd)
|
||
|
|
return -ENOMEM;
|
||
|
|
} else {
|
||
|
|
ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
|
||
|
|
}
|
||
|
|
|
||
|
|
rc = chsc_ssqd(*schid, ssqd);
|
||
|
|
if (rc)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
|
||
|
|
!(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
|
||
|
|
(ssqd->qdio_ssqd.sch != schid->sch_no))
|
||
|
|
rc = -EINVAL;
|
||
|
|
|
||
|
|
if (!rc)
|
||
|
|
memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
|
||
|
|
|
||
|
|
out:
|
||
|
|
if (!irq_ptr)
|
||
|
|
free_page((unsigned long)ssqd);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
|
||
|
|
{
|
||
|
|
unsigned char qdioac;
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
|
||
|
|
if (rc) {
|
||
|
|
DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
|
||
|
|
DBF_ERROR("rc:%x", rc);
|
||
|
|
/* 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);
|
||
|
|
irq_ptr->qdioac1 = qdioac;
|
||
|
|
DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
|
||
|
|
DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void qdio_fill_qdr_desc(struct qdesfmt0 *desc, struct qdio_q *queue)
|
||
|
|
{
|
||
|
|
desc->sliba = virt_to_phys(queue->slib);
|
||
|
|
desc->sla = virt_to_phys(queue->sl);
|
||
|
|
desc->slsba = virt_to_phys(&queue->slsb);
|
||
|
|
|
||
|
|
desc->akey = PAGE_DEFAULT_KEY >> 4;
|
||
|
|
desc->bkey = PAGE_DEFAULT_KEY >> 4;
|
||
|
|
desc->ckey = PAGE_DEFAULT_KEY >> 4;
|
||
|
|
desc->dkey = PAGE_DEFAULT_KEY >> 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void setup_qdr(struct qdio_irq *irq_ptr,
|
||
|
|
struct qdio_initialize *qdio_init)
|
||
|
|
{
|
||
|
|
struct qdesfmt0 *desc = &irq_ptr->qdr->qdf0[0];
|
||
|
|
int i;
|
||
|
|
|
||
|
|
memset(irq_ptr->qdr, 0, sizeof(struct qdr));
|
||
|
|
|
||
|
|
irq_ptr->qdr->qfmt = qdio_init->q_format;
|
||
|
|
irq_ptr->qdr->ac = qdio_init->qdr_ac;
|
||
|
|
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 = virt_to_phys(&irq_ptr->qib);
|
||
|
|
irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
|
||
|
|
|
||
|
|
for (i = 0; i < qdio_init->no_input_qs; i++)
|
||
|
|
qdio_fill_qdr_desc(desc++, irq_ptr->input_qs[i]);
|
||
|
|
|
||
|
|
for (i = 0; i < qdio_init->no_output_qs; i++)
|
||
|
|
qdio_fill_qdr_desc(desc++, irq_ptr->output_qs[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void setup_qib(struct qdio_irq *irq_ptr,
|
||
|
|
struct qdio_initialize *init_data)
|
||
|
|
{
|
||
|
|
memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
|
||
|
|
|
||
|
|
irq_ptr->qib.qfmt = init_data->q_format;
|
||
|
|
irq_ptr->qib.pfmt = init_data->qib_param_field_format;
|
||
|
|
|
||
|
|
irq_ptr->qib.rflags = init_data->qib_rflags;
|
||
|
|
if (css_general_characteristics.qebsm)
|
||
|
|
irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
|
||
|
|
|
||
|
|
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, dev_name(&irq_ptr->cdev->dev), 8);
|
||
|
|
ASCEBC(irq_ptr->qib.ebcnam, 8);
|
||
|
|
|
||
|
|
if (init_data->qib_param_field)
|
||
|
|
memcpy(irq_ptr->qib.parm, init_data->qib_param_field,
|
||
|
|
sizeof(irq_ptr->qib.parm));
|
||
|
|
}
|
||
|
|
|
||
|
|
void qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
|
||
|
|
{
|
||
|
|
struct ccw_device *cdev = irq_ptr->cdev;
|
||
|
|
|
||
|
|
irq_ptr->qdioac1 = 0;
|
||
|
|
memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
|
||
|
|
memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
|
||
|
|
|
||
|
|
irq_ptr->debugfs_dev = NULL;
|
||
|
|
irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
|
||
|
|
irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
|
||
|
|
irq_ptr->error_handler = init_data->input_handler;
|
||
|
|
|
||
|
|
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;
|
||
|
|
ccw_device_get_schid(cdev, &irq_ptr->schid);
|
||
|
|
setup_queues(irq_ptr, init_data);
|
||
|
|
|
||
|
|
irq_ptr->irq_poll = init_data->irq_poll;
|
||
|
|
set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
|
||
|
|
|
||
|
|
setup_qib(irq_ptr, init_data);
|
||
|
|
|
||
|
|
/* fill input and output descriptors */
|
||
|
|
setup_qdr(irq_ptr, init_data);
|
||
|
|
|
||
|
|
/* qdr, qib, sls, slsbs, slibs, sbales are filled now */
|
||
|
|
|
||
|
|
/* set our IRQ handler */
|
||
|
|
spin_lock_irq(get_ccwdev_lock(cdev));
|
||
|
|
irq_ptr->orig_handler = cdev->handler;
|
||
|
|
cdev->handler = qdio_int_handler;
|
||
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
||
|
|
}
|
||
|
|
|
||
|
|
void qdio_shutdown_irq(struct qdio_irq *irq)
|
||
|
|
{
|
||
|
|
struct ccw_device *cdev = irq->cdev;
|
||
|
|
|
||
|
|
/* restore IRQ handler */
|
||
|
|
spin_lock_irq(get_ccwdev_lock(cdev));
|
||
|
|
cdev->handler = irq->orig_handler;
|
||
|
|
cdev->private->intparm = 0;
|
||
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
||
|
|
}
|
||
|
|
|
||
|
|
void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
|
||
|
|
{
|
||
|
|
dev_info(&irq_ptr->cdev->dev,
|
||
|
|
"qdio: %s on SC %x using AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s\n",
|
||
|
|
(irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
|
||
|
|
((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
|
||
|
|
irq_ptr->schid.sch_no,
|
||
|
|
is_thinint_irq(irq_ptr),
|
||
|
|
(irq_ptr->sch_token) ? 1 : 0,
|
||
|
|
pci_out_supported(irq_ptr) ? 1 : 0,
|
||
|
|
css_general_characteristics.aif_tdd,
|
||
|
|
qdio_need_siga_in(irq_ptr) ? "R" : " ",
|
||
|
|
qdio_need_siga_out(irq_ptr) ? "W" : " ",
|
||
|
|
qdio_need_siga_sync(irq_ptr) ? "S" : " ");
|
||
|
|
}
|
||
|
|
|
||
|
|
int __init qdio_setup_init(void)
|
||
|
|
{
|
||
|
|
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). */
|
||
|
|
DBF_EVENT("thinint:%1d",
|
||
|
|
(css_general_characteristics.aif_osa) ? 1 : 0);
|
||
|
|
|
||
|
|
/* Check for QEBSM support in general (bit 58). */
|
||
|
|
DBF_EVENT("cssQEBSM:%1d", css_general_characteristics.qebsm);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void qdio_setup_exit(void)
|
||
|
|
{
|
||
|
|
kmem_cache_destroy(qdio_q_cache);
|
||
|
|
}
|