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83d81ef365
* Added ioctl for triggering IPIs * Added handler to invoke ASM wfe,wfi commands or NOP Change-Id: I907b6a27f3a7f3ff5b507e9f91066d8695dadbb4 Signed-off-by: Ian Grissom <igrissom@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2730675 Reviewed-by: Chris Dragan <kdragan@nvidia.com> Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This file is part of NVIDIA MODS kernel driver.
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*
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* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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*
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* NVIDIA MODS kernel driver is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* NVIDIA MODS kernel driver is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with NVIDIA MODS kernel driver.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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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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