Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 253 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
new file mode 100644
index 000000000..b65256a63
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/vas.c
@@ -0,0 +1,253 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2016-17 IBM Corp.
+ */
+
+#define pr_fmt(fmt) "vas: " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
+#include <asm/prom.h>
+#include <asm/xive.h>
+
+#include "vas.h"
+
+DEFINE_MUTEX(vas_mutex);
+static LIST_HEAD(vas_instances);
+
+static DEFINE_PER_CPU(int, cpu_vas_id);
+
+static int vas_irq_fault_window_setup(struct vas_instance *vinst)
+{
+	int rc = 0;
+
+	rc = request_threaded_irq(vinst->virq, vas_fault_handler,
+				vas_fault_thread_fn, 0, vinst->name, vinst);
+
+	if (rc) {
+		pr_err("VAS[%d]: Request IRQ(%d) failed with %d\n",
+				vinst->vas_id, vinst->virq, rc);
+		goto out;
+	}
+
+	rc = vas_setup_fault_window(vinst);
+	if (rc)
+		free_irq(vinst->virq, vinst);
+
+out:
+	return rc;
+}
+
+static int init_vas_instance(struct platform_device *pdev)
+{
+	struct device_node *dn = pdev->dev.of_node;
+	struct vas_instance *vinst;
+	struct xive_irq_data *xd;
+	uint32_t chipid, hwirq;
+	struct resource *res;
+	int rc, cpu, vasid;
+
+	rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
+	if (rc) {
+		pr_err("No ibm,vas-id property for %s?\n", pdev->name);
+		return -ENODEV;
+	}
+
+	rc = of_property_read_u32(dn, "ibm,chip-id", &chipid);
+	if (rc) {
+		pr_err("No ibm,chip-id property for %s?\n", pdev->name);
+		return -ENODEV;
+	}
+
+	if (pdev->num_resources != 4) {
+		pr_err("Unexpected DT configuration for [%s, %d]\n",
+				pdev->name, vasid);
+		return -ENODEV;
+	}
+
+	vinst = kzalloc(sizeof(*vinst), GFP_KERNEL);
+	if (!vinst)
+		return -ENOMEM;
+
+	vinst->name = kasprintf(GFP_KERNEL, "vas-%d", vasid);
+	if (!vinst->name) {
+		kfree(vinst);
+		return -ENOMEM;
+	}
+
+	INIT_LIST_HEAD(&vinst->node);
+	ida_init(&vinst->ida);
+	mutex_init(&vinst->mutex);
+	vinst->vas_id = vasid;
+	vinst->pdev = pdev;
+
+	res = &pdev->resource[0];
+	vinst->hvwc_bar_start = res->start;
+
+	res = &pdev->resource[1];
+	vinst->uwc_bar_start = res->start;
+
+	res = &pdev->resource[2];
+	vinst->paste_base_addr = res->start;
+
+	res = &pdev->resource[3];
+	if (res->end > 62) {
+		pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end);
+		goto free_vinst;
+	}
+
+	vinst->paste_win_id_shift = 63 - res->end;
+
+	hwirq = xive_native_alloc_irq_on_chip(chipid);
+	if (!hwirq) {
+		pr_err("Inst%d: Unable to allocate global irq for chip %d\n",
+				vinst->vas_id, chipid);
+		return -ENOENT;
+	}
+
+	vinst->virq = irq_create_mapping(NULL, hwirq);
+	if (!vinst->virq) {
+		pr_err("Inst%d: Unable to map global irq %d\n",
+				vinst->vas_id, hwirq);
+		return -EINVAL;
+	}
+
+	xd = irq_get_handler_data(vinst->virq);
+	if (!xd) {
+		pr_err("Inst%d: Invalid virq %d\n",
+				vinst->vas_id, vinst->virq);
+		return -EINVAL;
+	}
+
+	vinst->irq_port = xd->trig_page;
+	pr_devel("Initialized instance [%s, %d] paste_base 0x%llx paste_win_id_shift 0x%llx IRQ %d Port 0x%llx\n",
+			pdev->name, vasid, vinst->paste_base_addr,
+			vinst->paste_win_id_shift, vinst->virq,
+			vinst->irq_port);
+
+	for_each_possible_cpu(cpu) {
+		if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
+			per_cpu(cpu_vas_id, cpu) = vasid;
+	}
+
+	mutex_lock(&vas_mutex);
+	list_add(&vinst->node, &vas_instances);
+	mutex_unlock(&vas_mutex);
+
+	spin_lock_init(&vinst->fault_lock);
+	/*
+	 * IRQ and fault handling setup is needed only for user space
+	 * send windows.
+	 */
+	if (vinst->virq) {
+		rc = vas_irq_fault_window_setup(vinst);
+		/*
+		 * Fault window is used only for user space send windows.
+		 * So if vinst->virq is NULL, tx_win_open returns -ENODEV
+		 * for user space.
+		 */
+		if (rc)
+			vinst->virq = 0;
+	}
+
+	vas_instance_init_dbgdir(vinst);
+
+	dev_set_drvdata(&pdev->dev, vinst);
+
+	return 0;
+
+free_vinst:
+	kfree(vinst->name);
+	kfree(vinst);
+	return -ENODEV;
+
+}
+
+/*
+ * Although this is read/used multiple times, it is written to only
+ * during initialization.
+ */
+struct vas_instance *find_vas_instance(int vasid)
+{
+	struct list_head *ent;
+	struct vas_instance *vinst;
+
+	mutex_lock(&vas_mutex);
+
+	if (vasid == -1)
+		vasid = per_cpu(cpu_vas_id, smp_processor_id());
+
+	list_for_each(ent, &vas_instances) {
+		vinst = list_entry(ent, struct vas_instance, node);
+		if (vinst->vas_id == vasid) {
+			mutex_unlock(&vas_mutex);
+			return vinst;
+		}
+	}
+	mutex_unlock(&vas_mutex);
+
+	pr_devel("Instance %d not found\n", vasid);
+	return NULL;
+}
+
+int chip_to_vas_id(int chipid)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		if (cpu_to_chip_id(cpu) == chipid)
+			return per_cpu(cpu_vas_id, cpu);
+	}
+	return -1;
+}
+EXPORT_SYMBOL(chip_to_vas_id);
+
+static int vas_probe(struct platform_device *pdev)
+{
+	return init_vas_instance(pdev);
+}
+
+static const struct of_device_id powernv_vas_match[] = {
+	{ .compatible = "ibm,vas",},
+	{},
+};
+
+static struct platform_driver vas_driver = {
+	.driver = {
+		.name = "vas",
+		.of_match_table = powernv_vas_match,
+	},
+	.probe = vas_probe,
+};
+
+static int __init vas_init(void)
+{
+	int found = 0;
+	struct device_node *dn;
+
+	platform_driver_register(&vas_driver);
+
+	for_each_compatible_node(dn, NULL, "ibm,vas") {
+		of_platform_device_create(dn, NULL, NULL);
+		found++;
+	}
+
+	if (!found) {
+		platform_driver_unregister(&vas_driver);
+		return -ENODEV;
+	}
+
+	pr_devel("Found %d instances\n", found);
+
+	return 0;
+}
+device_initcall(vas_init);