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0ae09fcdd1
It is unnecessary to spell out license text when we are using SPDX license identifiers. Change-Id: I902e18a413126f4dddb0cbb1fb5c0e0de385d2a1 Signed-off-by: Chris Dragan <kdragan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2892356 Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2023, NVIDIA CORPORATION. All rights reserved. */
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#include "mods_internal.h"
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#include <asm/barrier.h>
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#include <linux/cpu.h>
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#include <linux/cpumask.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#define MAX_IPI_WFI_LOOPS 5
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#define MAX_IPI_WFE_LOOPS 10
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static void ipi_wfi_cpu(void *p)
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{
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struct MODS_SEND_IPI *p_ipi = (struct MODS_SEND_IPI *)p;
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u32 i;
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for (i = 0; i < p_ipi->num_loops; i++)
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wfi();
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}
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static void ipi_wfe_cpu(void *p)
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{
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struct MODS_SEND_IPI *p_ipi = (struct MODS_SEND_IPI *)p;
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u32 i;
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for (i = 0; i < p_ipi->num_loops; i++)
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wfe();
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}
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int esc_mods_send_ipi(struct mods_client *client, struct MODS_SEND_IPI *p)
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{
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LOG_ENT();
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switch (p->ipi_type) {
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case MODS_IPI_KICK: {
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kick_all_cpus_sync();
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break;
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}
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case MODS_IPI_WFI: {
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if (p->num_loops > MAX_IPI_WFI_LOOPS) {
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cl_error("num_loops %u exceed maximum limit %d for MODS_IPI_WFI\n",
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p->num_loops,
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MAX_IPI_WFI_LOOPS);
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LOG_EXT();
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return -EINVAL;
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}
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preempt_disable();
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smp_call_function_many(cpu_online_mask, ipi_wfi_cpu, (void *)p, 1);
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preempt_enable();
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break;
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}
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case MODS_IPI_WFE: {
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if (p->num_loops > MAX_IPI_WFE_LOOPS) {
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cl_error("num_loops %u exceed maximum limit %d for MODS_IPI_WFE\n",
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p->num_loops,
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MAX_IPI_WFE_LOOPS);
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LOG_EXT();
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return -EINVAL;
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}
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preempt_disable();
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smp_call_function_many(cpu_online_mask, ipi_wfe_cpu, (void *)p, 1);
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preempt_enable();
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break;
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}
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default: {
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cl_error("unsupported MODS_IPI_TYPE\n");
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LOG_EXT();
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return -EINVAL;
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}
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}
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LOG_EXT();
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return 0;
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}
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