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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
*/
#define pr_fmt(fmt) "[drm:%s:%d] " fmt, __func__, __LINE__
#include <linux/debugfs.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/kthread.h>
#include "dpu_core_irq.h"
#include "dpu_trace.h"
/**
* dpu_core_irq_callback_handler - dispatch core interrupts
* @arg: private data of callback handler
* @irq_idx: interrupt index
*/
static void dpu_core_irq_callback_handler(void *arg, int irq_idx)
{
struct dpu_kms *dpu_kms = arg;
struct dpu_irq *irq_obj = &dpu_kms->irq_obj;
struct dpu_irq_callback *cb;
VERB("irq_idx=%d\n", irq_idx);
if (list_empty(&irq_obj->irq_cb_tbl[irq_idx]))
DRM_ERROR("no registered cb, idx:%d\n", irq_idx);
atomic_inc(&irq_obj->irq_counts[irq_idx]);
/*
* Perform registered function callback
*/
list_for_each_entry(cb, &irq_obj->irq_cb_tbl[irq_idx], list)
if (cb->func)
cb->func(cb->arg, irq_idx);
}
u32 dpu_core_irq_read(struct dpu_kms *dpu_kms, int irq_idx, bool clear)
{
if (!dpu_kms->hw_intr ||
!dpu_kms->hw_intr->ops.get_interrupt_status)
return 0;
if (irq_idx < 0) {
DPU_ERROR("[%pS] invalid irq_idx=%d\n",
__builtin_return_address(0), irq_idx);
return 0;
}
return dpu_kms->hw_intr->ops.get_interrupt_status(dpu_kms->hw_intr,
irq_idx, clear);
}
int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms, int irq_idx,
struct dpu_irq_callback *register_irq_cb)
{
unsigned long irq_flags;
if (!dpu_kms->irq_obj.irq_cb_tbl) {
DPU_ERROR("invalid params\n");
return -EINVAL;
}
if (!register_irq_cb || !register_irq_cb->func) {
DPU_ERROR("invalid irq_cb:%d func:%d\n",
register_irq_cb != NULL,
register_irq_cb ?
register_irq_cb->func != NULL : -1);
return -EINVAL;
}
if (irq_idx < 0 || irq_idx >= dpu_kms->hw_intr->total_irqs) {
DPU_ERROR("invalid IRQ index: [%d]\n", irq_idx);
return -EINVAL;
}
VERB("[%pS] irq_idx=%d\n", __builtin_return_address(0), irq_idx);
irq_flags = dpu_kms->hw_intr->ops.lock(dpu_kms->hw_intr);
trace_dpu_core_irq_register_callback(irq_idx, register_irq_cb);
list_del_init(®ister_irq_cb->list);
list_add_tail(®ister_irq_cb->list,
&dpu_kms->irq_obj.irq_cb_tbl[irq_idx]);
if (list_is_first(®ister_irq_cb->list,
&dpu_kms->irq_obj.irq_cb_tbl[irq_idx])) {
int ret = dpu_kms->hw_intr->ops.enable_irq_locked(
dpu_kms->hw_intr,
irq_idx);
if (ret)
DPU_ERROR("Fail to enable IRQ for irq_idx:%d\n",
irq_idx);
}
dpu_kms->hw_intr->ops.unlock(dpu_kms->hw_intr, irq_flags);
return 0;
}
int dpu_core_irq_unregister_callback(struct dpu_kms *dpu_kms, int irq_idx,
struct dpu_irq_callback *register_irq_cb)
{
unsigned long irq_flags;
if (!dpu_kms->irq_obj.irq_cb_tbl) {
DPU_ERROR("invalid params\n");
return -EINVAL;
}
if (!register_irq_cb || !register_irq_cb->func) {
DPU_ERROR("invalid irq_cb:%d func:%d\n",
register_irq_cb != NULL,
register_irq_cb ?
register_irq_cb->func != NULL : -1);
return -EINVAL;
}
if (irq_idx < 0 || irq_idx >= dpu_kms->hw_intr->total_irqs) {
DPU_ERROR("invalid IRQ index: [%d]\n", irq_idx);
return -EINVAL;
}
VERB("[%pS] irq_idx=%d\n", __builtin_return_address(0), irq_idx);
irq_flags = dpu_kms->hw_intr->ops.lock(dpu_kms->hw_intr);
trace_dpu_core_irq_unregister_callback(irq_idx, register_irq_cb);
list_del_init(®ister_irq_cb->list);
/* empty callback list but interrupt is still enabled */
if (list_empty(&dpu_kms->irq_obj.irq_cb_tbl[irq_idx])) {
int ret = dpu_kms->hw_intr->ops.disable_irq_locked(
dpu_kms->hw_intr,
irq_idx);
if (ret)
DPU_ERROR("Fail to disable IRQ for irq_idx:%d\n",
irq_idx);
VERB("irq_idx=%d ret=%d\n", irq_idx, ret);
}
dpu_kms->hw_intr->ops.unlock(dpu_kms->hw_intr, irq_flags);
return 0;
}
static void dpu_clear_all_irqs(struct dpu_kms *dpu_kms)
{
if (!dpu_kms->hw_intr || !dpu_kms->hw_intr->ops.clear_all_irqs)
return;
dpu_kms->hw_intr->ops.clear_all_irqs(dpu_kms->hw_intr);
}
static void dpu_disable_all_irqs(struct dpu_kms *dpu_kms)
{
if (!dpu_kms->hw_intr || !dpu_kms->hw_intr->ops.disable_all_irqs)
return;
dpu_kms->hw_intr->ops.disable_all_irqs(dpu_kms->hw_intr);
}
#ifdef CONFIG_DEBUG_FS
static int dpu_debugfs_core_irq_show(struct seq_file *s, void *v)
{
struct dpu_kms *dpu_kms = s->private;
struct dpu_irq *irq_obj = &dpu_kms->irq_obj;
struct dpu_irq_callback *cb;
unsigned long irq_flags;
int i, irq_count, cb_count;
if (WARN_ON(!irq_obj->irq_cb_tbl))
return 0;
for (i = 0; i < irq_obj->total_irqs; i++) {
irq_flags = dpu_kms->hw_intr->ops.lock(dpu_kms->hw_intr);
cb_count = 0;
irq_count = atomic_read(&irq_obj->irq_counts[i]);
list_for_each_entry(cb, &irq_obj->irq_cb_tbl[i], list)
cb_count++;
dpu_kms->hw_intr->ops.unlock(dpu_kms->hw_intr, irq_flags);
if (irq_count || cb_count)
seq_printf(s, "idx:%d irq:%d cb:%d\n",
i, irq_count, cb_count);
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(dpu_debugfs_core_irq);
void dpu_debugfs_core_irq_init(struct dpu_kms *dpu_kms,
struct dentry *parent)
{
debugfs_create_file("core_irq", 0600, parent, dpu_kms,
&dpu_debugfs_core_irq_fops);
}
#endif
void dpu_core_irq_preinstall(struct dpu_kms *dpu_kms)
{
int i;
pm_runtime_get_sync(&dpu_kms->pdev->dev);
dpu_clear_all_irqs(dpu_kms);
dpu_disable_all_irqs(dpu_kms);
pm_runtime_put_sync(&dpu_kms->pdev->dev);
/* Create irq callbacks for all possible irq_idx */
dpu_kms->irq_obj.total_irqs = dpu_kms->hw_intr->total_irqs;
dpu_kms->irq_obj.irq_cb_tbl = kcalloc(dpu_kms->irq_obj.total_irqs,
sizeof(struct list_head), GFP_KERNEL);
dpu_kms->irq_obj.irq_counts = kcalloc(dpu_kms->irq_obj.total_irqs,
sizeof(atomic_t), GFP_KERNEL);
for (i = 0; i < dpu_kms->irq_obj.total_irqs; i++) {
INIT_LIST_HEAD(&dpu_kms->irq_obj.irq_cb_tbl[i]);
atomic_set(&dpu_kms->irq_obj.irq_counts[i], 0);
}
}
void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms)
{
int i;
pm_runtime_get_sync(&dpu_kms->pdev->dev);
for (i = 0; i < dpu_kms->irq_obj.total_irqs; i++)
if (!list_empty(&dpu_kms->irq_obj.irq_cb_tbl[i]))
DPU_ERROR("irq_idx=%d still enabled/registered\n", i);
dpu_clear_all_irqs(dpu_kms);
dpu_disable_all_irqs(dpu_kms);
pm_runtime_put_sync(&dpu_kms->pdev->dev);
kfree(dpu_kms->irq_obj.irq_cb_tbl);
kfree(dpu_kms->irq_obj.irq_counts);
dpu_kms->irq_obj.irq_cb_tbl = NULL;
dpu_kms->irq_obj.irq_counts = NULL;
dpu_kms->irq_obj.total_irqs = 0;
}
irqreturn_t dpu_core_irq(struct dpu_kms *dpu_kms)
{
/*
* Dispatch to HW driver to handle interrupt lookup that is being
* fired. When matching interrupt is located, HW driver will call to
* dpu_core_irq_callback_handler with the irq_idx from the lookup table.
* dpu_core_irq_callback_handler will perform the registered function
* callback, and do the interrupt status clearing once the registered
* callback is finished.
* Function will also clear the interrupt status after reading.
*/
dpu_kms->hw_intr->ops.dispatch_irqs(
dpu_kms->hw_intr,
dpu_core_irq_callback_handler,
dpu_kms);
return IRQ_HANDLED;
}
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