// SPDX-License-Identifier: GPL-2.0
/*
* qdio queue initialization
*
* Copyright IBM Corp. 2008
* Author(s): Jan Glauber <[email protected]>
*/
#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_dma64(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_dma64(queue->slib);
desc->sla = virt_to_dma64(queue->sl);
desc->slsba = virt_to_dma64(&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_dma64(&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);
}
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