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c9d5d23a33
Commit ef4c675dc296 ("genirq: Unexport nr_irqs") unexported 'nr_irqs' in
Linux v6.13 and this breaks the build for the cpuidle-debugfs driver.
For Linux v6.13 the number of IRQs can be queried by using the function
irq_get_nr_irqs() instead. Fix the build by using conftest to detect if
the function irq_get_nr_irqs() and use this function if it is present.
Bug 4991705
Change-Id: I98d477896fcf9e8d2e1afa21e2f7ba4d071ab442
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3261690
Reviewed-by: Ishan Shah <ishah@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Preetham Chandru R <pchandru@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// SPDX-FileCopyrightText: Copyright (c) 2023-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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/*
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* Module to force cpuidle states through debugfs files.
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*/
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#include <nvidia/conftest.h>
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#include <linux/module.h>
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#include <linux/irq.h>
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#include <linux/irqdesc.h>
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#include <linux/interrupt.h>
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#include <linux/debugfs.h>
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#include <linux/cpu.h>
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#include <linux/cpuidle.h>
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#define US_TO_NS(x) (1000 * x)
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static struct cpuidle_driver *drv;
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static bool is_timer_irq(struct irq_desc *desc)
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{
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return desc && desc->action && (desc->action->flags & IRQF_TIMER);
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}
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static void suspend_all_device_irqs(void)
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{
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struct irq_data *data;
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struct irq_desc *desc;
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unsigned int nirqs;
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int irq;
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#if defined(NV_IRQ_GET_NR_IRQS_PRESENT) /* Linux v6.13 */
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nirqs = irq_get_nr_irqs();
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#else
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nirqs = nr_irqs;
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#endif
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for (irq = 0, data = irq_get_irq_data(irq); irq < nirqs;
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irq++, data = irq_get_irq_data(irq)) {
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if (!data)
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continue;
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desc = irq_data_to_desc(data);
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if (!desc || is_timer_irq(desc))
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continue;
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irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY);
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disable_irq_nosync(irq);
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}
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}
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static void resume_all_device_irqs(void)
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{
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struct irq_data *data;
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struct irq_desc *desc;
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unsigned int nirqs;
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int irq;
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#if defined(NV_IRQ_GET_NR_IRQS_PRESENT)
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nirqs = irq_get_nr_irqs();
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#else
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nirqs = nr_irqs;
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#endif
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for (irq = 0, data = irq_get_irq_data(irq); irq < nirqs;
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irq++, data = irq_get_irq_data(irq)) {
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if (!data)
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continue;
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desc = irq_data_to_desc(data);
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if (!desc || is_timer_irq(desc))
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continue;
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enable_irq(desc->irq_data.irq);
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irq_clear_status_flags(irq, IRQ_DISABLE_UNLAZY);
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}
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}
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static int forced_idle_write(void *data, u64 val)
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{
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struct cpuidle_state *idle_state = (struct cpuidle_state *) data;
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int ret = 0;
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u64 duration_ns = US_TO_NS(val);
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suspend_all_device_irqs();
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/* duration_ns, latency_ns */
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play_idle_precise(duration_ns, (u64) (idle_state->exit_latency_ns));
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resume_all_device_irqs();
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return ret;
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}
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DEFINE_SIMPLE_ATTRIBUTE(idle_state_fops, NULL, forced_idle_write, "%llu\n");
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static struct dentry *cpuidle_debugfs_node;
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static int init_debugfs(void)
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{
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int i;
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cpuidle_debugfs_node = debugfs_create_dir("cpuidle_debug", NULL);
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if (!cpuidle_debugfs_node)
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goto err_out;
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for (i = 0; i < drv->state_count; i++) {
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debugfs_create_file(drv->states[i].name, 0200,
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cpuidle_debugfs_node, &(drv->states[i]), &idle_state_fops);
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}
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return 0;
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err_out:
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pr_err("%s: Couldn't create debugfs node for cpuidle\n", __func__);
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debugfs_remove_recursive(cpuidle_debugfs_node);
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return -ENOMEM;
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}
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static int __init cpuidle_debugfs_probe(void)
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{
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drv = cpuidle_get_driver();
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init_debugfs();
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return 0;
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}
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static void __exit cpuidle_debugfs_remove(void)
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{
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debugfs_remove_recursive(cpuidle_debugfs_node);
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}
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module_init(cpuidle_debugfs_probe);
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module_exit(cpuidle_debugfs_remove);
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MODULE_AUTHOR("Ishan Shah <ishah@nvidia.com>");
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MODULE_DESCRIPTION("cpuidle debugfs driver");
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MODULE_LICENSE("GPL");
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