/*

   * 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 <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;

  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);

  /**
   * 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);

  /*
   * 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++;

  
  	/* 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) {

  		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);
  	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->cdev = init_data->cdev;

  	ccw_device_get_schid(irq_ptr->cdev, &irq_ptr->schid);

  	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 PRI:%d TDD:%d SIGA:%s%s%s%s%s
  ",

  		 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);
  }