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misc: mods: add IPI ioctls

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* 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>
This commit is contained in:
Ian Grissom
2022-07-18 12:58:07 -06:00
committed by Laxman Dewangan
parent e01a6e01a0
commit 83d81ef365
5 changed files with 122 additions and 0 deletions
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94
drivers/misc/mods/mods_ipi.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* This file is part of NVIDIA MODS kernel driver.
*
* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* NVIDIA MODS kernel driver is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* NVIDIA MODS kernel driver is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with NVIDIA MODS kernel driver.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "mods_internal.h"
#include <asm/barrier.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/slab.h>
#include <linux/smp.h>
#define MAX_IPI_WFI_LOOPS 5
#define MAX_IPI_WFE_LOOPS 10
static void ipi_wfi_cpu(void *p)
{
struct MODS_SEND_IPI *p_ipi = (struct MODS_SEND_IPI *)p;
u32 i;
for (i = 0; i < p_ipi->num_loops; i++)
wfi();
}
static void ipi_wfe_cpu(void *p)
{
struct MODS_SEND_IPI *p_ipi = (struct MODS_SEND_IPI *)p;
u32 i;
for (i = 0; i < p_ipi->num_loops; i++)
wfe();
}
int esc_mods_send_ipi(struct mods_client *client, struct MODS_SEND_IPI *p)
{
LOG_ENT();
switch (p->ipi_type) {
case MODS_IPI_KICK: {
kick_all_cpus_sync();
break;
}
case MODS_IPI_WFI: {
if (p->num_loops > MAX_IPI_WFI_LOOPS) {
cl_error("num_loops %u exceed maximum limit %d for MODS_IPI_WFI\n",
p->num_loops,
MAX_IPI_WFI_LOOPS);
LOG_EXT();
return -EINVAL;
}
preempt_disable();
smp_call_function_many(cpu_online_mask, ipi_wfi_cpu, (void *)p, 1);
preempt_enable();
break;
}
case MODS_IPI_WFE: {
if (p->num_loops > MAX_IPI_WFE_LOOPS) {
cl_error("num_loops %u exceed maximum limit %d for MODS_IPI_WFE\n",
p->num_loops,
MAX_IPI_WFE_LOOPS);
LOG_EXT();
return -EINVAL;
}
preempt_disable();
smp_call_function_many(cpu_online_mask, ipi_wfe_cpu, (void *)p, 1);
preempt_enable();
break;
}
default: {
cl_error("unsupported MODS_IPI_TYPE\n");
LOG_EXT();
return -EINVAL;
}
}
LOG_EXT();
return 0;
}