1 files changed, 437 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..714878e2a
--- /dev/null
+++ b/drivers/s390/cio/qdio_setup.c
@@ -0,0 +1,437 @@
+// 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/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_phys(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_phys(queue->slib);
+	desc->sla = virt_to_phys(queue->sl);
+	desc->slsba = virt_to_phys(&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_phys(&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);
+}