[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>

1 files changed, 521 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
new file mode 100644
index 000000000000..f0923a8aceda
--- /dev/null
+++ b/drivers/s390/cio/qdio_setup.c
@@ -0,0 +1,521 @@
+/*
+ * 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);
+}