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soc: qcom: rpmh-rsc: Enhance check for VRM in-flight request 

commit f592cc5794747b81e53b53dd6e80219ee25f0611 upstream.

Each RPMh VRM accelerator resource has 3 or 4 contiguous 4-byte aligned
addresses associated with it. These control voltage, enable state, mode,
and in legacy targets, voltage headroom. The current in-flight request
checking logic looks for exact address matches. Requests for different
addresses of the same RPMh resource as thus not detected as in-flight.

Add new cmd-db API cmd_db_match_resource_addr() to enhance the in-flight
request check for VRM requests by ignoring the address offset.

This ensures that only one request is allowed to be in-flight for a given
VRM resource. This is needed to avoid scenarios where request commands are
carried out by RPMh hardware out-of-order leading to LDO regulator
over-current protection triggering.

Fixes: 658628e7ef ("drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs")
Cc: stable@vger.kernel.org
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Elliot Berman <quic_eberman@quicinc.com> # sm8650-qrd
Signed-off-by: Maulik Shah <quic_mkshah@quicinc.com>
Link: https://lore.kernel.org/r/20240215-rpmh-rsc-fixes-v4-1-9cbddfcba05b@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maulik Shah 2024-02-15 10:55:44 +05:30 committed by Greg Kroah-Hartman
parent 0a47ba94ec
commit 6a283d64b4
3 changed files with 42 additions and 3 deletions
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32
drivers/soc/qcom/cmd-db.c
View File

@ -1,6 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2016-2018, 2020, The Linux Foundation. All rights reserved. */
/*
* Copyright (c) 2016-2018, 2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/bitfield.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -17,6 +21,8 @@
#define MAX_SLV_ID 8
#define SLAVE_ID_MASK 0x7
#define SLAVE_ID_SHIFT 16
#define SLAVE_ID(addr) FIELD_GET(GENMASK(19, 16), addr)
#define VRM_ADDR(addr) FIELD_GET(GENMASK(19, 4), addr)
/**
* struct entry_header: header for each entry in cmddb
@ -220,6 +226,30 @@ const void *cmd_db_read_aux_data(const char *id, size_t *len)
}
EXPORT_SYMBOL(cmd_db_read_aux_data);
/**
* cmd_db_match_resource_addr() - Compare if both Resource addresses are same
*
* @addr1: Resource address to compare
* @addr2: Resource address to compare
*
* Return: true if two addresses refer to the same resource, false otherwise
*/
bool cmd_db_match_resource_addr(u32 addr1, u32 addr2)
{
/*
* Each RPMh VRM accelerator resource has 3 or 4 contiguous 4-byte
* aligned addresses associated with it. Ignore the offset to check
* for VRM requests.
*/
if (addr1 == addr2)
return true;
else if (SLAVE_ID(addr1) == CMD_DB_HW_VRM && VRM_ADDR(addr1) == VRM_ADDR(addr2))
return true;
return false;
}
EXPORT_SYMBOL_GPL(cmd_db_match_resource_addr);
/**
* cmd_db_read_slave_id - Get the slave ID for a given resource address
*

3
drivers/soc/qcom/rpmh-rsc.c
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
* Copyright (c) 2023-2024, Qualcomm Innovation Center, Inc. All rights reserved.
*/
#define pr_fmt(fmt) "%s " fmt, KBUILD_MODNAME
@ -557,7 +558,7 @@ static int check_for_req_inflight(struct rsc_drv *drv, struct tcs_group *tcs,
for_each_set_bit(j, &curr_enabled, MAX_CMDS_PER_TCS) {
addr = read_tcs_cmd(drv, drv->regs[RSC_DRV_CMD_ADDR], i, j);
for (k = 0; k < msg->num_cmds; k++) {
if (addr == msg->cmds[k].addr)
if (cmd_db_match_resource_addr(msg->cmds[k].addr, addr))
return -EBUSY;
}
}

10
include/soc/qcom/cmd-db.h
View File

@ -1,5 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
/*
* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
* Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
*/
#ifndef __QCOM_COMMAND_DB_H__
#define __QCOM_COMMAND_DB_H__
@ -21,6 +24,8 @@ u32 cmd_db_read_addr(const char *resource_id);
const void *cmd_db_read_aux_data(const char *resource_id, size_t *len);
bool cmd_db_match_resource_addr(u32 addr1, u32 addr2);
enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id);
int cmd_db_ready(void);
@ -31,6 +36,9 @@ static inline u32 cmd_db_read_addr(const char *resource_id)
static inline const void *cmd_db_read_aux_data(const char *resource_id, size_t *len)
{ return ERR_PTR(-ENODEV); }
static inline bool cmd_db_match_resource_addr(u32 addr1, u32 addr2)
{ return false; }
static inline enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id)
{ return -ENODEV; }