qdio_setup.c

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/*
 * 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 <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;
static struct kmem_cache *qdio_aob_cache;

struct qaob *qdio_allocate_aob(void)
{
    return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
}
EXPORT_SYMBOL_GPL(qdio_allocate_aob);

void qdio_release_aob(struct qaob *aob)
{
    kmem_cache_free(qdio_aob_cache, aob);
}
EXPORT_SYMBOL_GPL(qdio_release_aob);

/*
 * 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;

    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;

        q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
        if (!q->slib) {
            kmem_cache_free(qdio_q_cache, q);
            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);
    return rc;
}

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,
                void **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++;
        BUG_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];
}

static void setup_queues(struct qdio_irq *irq_ptr,
             struct qdio_initialize *qdio_init)
{
    struct qdio_q *q;
    void **input_sbal_array = qdio_init->input_sbal_addr_array;
    void **output_sbal_array = qdio_init->output_sbal_addr_array;
    struct qdio_outbuf_state *output_sbal_state_array =
                  qdio_init->output_sbal_state_array;
    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;
        q->u.in.queue_start_poll = qdio_init->queue_start_poll_array ?
                qdio_init->queue_start_poll_array[i] : NULL;

        setup_storage_lists(q, irq_ptr, input_sbal_array, 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) {
        DBF_EVENT("outq:%1d", i);
        setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);

        q->u.out.sbal_state = output_sbal_state_array;
        output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;

        q->is_input_q = 0;
        q->u.out.scan_threshold = qdio_init->scan_threshold;
        setup_storage_lists(q, irq_ptr, output_sbal_array, 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.sync_after_ai = 1;
    if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
        irq_ptr->siga_flag.sync_out_after_pci = 1;
}

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 != NULL)
        ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
    else
        ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
    memset(ssqd, 0, PAGE_SIZE);

    ssqd->request = (struct chsc_header) {
        .length = 0x0010,
        .code   = 0x0024,
    };
    ssqd->first_sch = schid->sch_no;
    ssqd->last_sch = schid->sch_no;
    ssqd->ssid = 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 != schid->sch_no))
        return -EINVAL;

    if (irq_ptr != NULL)
        memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
               sizeof(struct qdio_ssqd_desc));
    else {
        memcpy(data, &ssqd->qdio_ssqd,
               sizeof(struct qdio_ssqd_desc));
        free_page((unsigned long)ssqd);
    }
    return 0;
}

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, NULL);
    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);
    process_ac_flags(irq_ptr, 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);
}

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) {
            if (q->u.out.use_cq) {
                int n;

                for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
                    struct qaob *aob = q->u.out.aobs[n];
                    if (aob) {
                        qdio_release_aob(aob);
                        q->u.out.aobs[n] = NULL;
                    }
                }

                qdio_disable_async_operation(&q->u.out);
            }
            free_page((unsigned long) q->slib);
            kmem_cache_free(qdio_q_cache, q);
        }
    }
    free_page((unsigned long) 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 >> 4;
    irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
    irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
    irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
}

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->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 = (unsigned long)&irq_ptr->qib;
    irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;

    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.rflags |= init_data->qib_rflags;

    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->qib, 0, sizeof(irq_ptr->qib));
    memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
    memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
    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 = irq_ptr->debugfs_perf = NULL;
    irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;

    /* 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) {
        DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
        rc = -EINVAL;
        goto out_err;
    }
    irq_ptr->equeue = *ciw;

    ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
    if (!ciw) {
        DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
        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];

    snprintf(s, 80, "qdio: %s %s on SC %x using "
         "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s\n",
         dev_name(&cdev->dev),
         (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,
         (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
         css_general_characteristics.aif_tdd,
         (irq_ptr->siga_flag.input) ? "R" : " ",
         (irq_ptr->siga_flag.output) ? "W" : " ",
         (irq_ptr->siga_flag.sync) ? "S" : " ",
         (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
         (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
    printk(KERN_INFO "%s", s);
}

int qdio_enable_async_operation(struct qdio_output_q *outq)
{
    outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
                 GFP_ATOMIC);
    if (!outq->aobs) {
        outq->use_cq = 0;
        return -ENOMEM;
    }
    outq->use_cq = 1;
    return 0;
}

void qdio_disable_async_operation(struct qdio_output_q *q)
{
    kfree(q->aobs);
    q->aobs = NULL;
    q->use_cq = 0;
}

int __init qdio_setup_init(void)
{
    int rc;

    qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
                     256, 0, NULL);
    if (!qdio_q_cache)
        return -ENOMEM;

    qdio_aob_cache = kmem_cache_create("qdio_aob",
                    sizeof(struct qaob),
                    sizeof(struct qaob),
                    0,
                    NULL);
    if (!qdio_aob_cache) {
        rc = -ENOMEM;
        goto free_qdio_q_cache;
    }

    /* 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", (qebsm_possible()) ? 1 : 0);
    rc = 0;
out:
    return rc;
free_qdio_q_cache:
    kmem_cache_destroy(qdio_q_cache);
    goto out;
}

void qdio_setup_exit(void)
{
    kmem_cache_destroy(qdio_aob_cache);
    kmem_cache_destroy(qdio_q_cache);
}