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// 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);
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