1 files changed, 595 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
new file mode 100644
index 000000000..b8955e20f
--- /dev/null
+++ b/drivers/s390/cio/qdio_setup.c
@@ -0,0 +1,595 @@
+// 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/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)
+{
+	return css_general_characteristics.qebsm;
+}
+
+/*
+ * 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_zalloc(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;
+		INIT_LIST_HEAD(&q->entry);
+	}
+	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;
+	INIT_LIST_HEAD(&q->entry);
+}
+
+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 = virt_to_phys(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);
+		timer_setup(&q->u.out.timer, qdio_outbound_timer, 0);
+	}
+}
+
+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;
+
+	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);
+	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);
+		return -EINVAL;
+	}
+	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);
+		return -EINVAL;
+	}
+	irq_ptr->aqueue = *ciw;
+
+	/* set new interrupt handler */
+	spin_lock_irq(get_ccwdev_lock(irq_ptr->cdev));
+	irq_ptr->orig_handler = init_data->cdev->handler;
+	init_data->cdev->handler = qdio_int_handler;
+	spin_unlock_irq(get_ccwdev_lock(irq_ptr->cdev));
+	return 0;
+}
+
+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\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 = kcalloc(QDIO_MAX_BUFFERS_PER_Q, sizeof(struct qaob *),
+			     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);
+}