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clk: qcom: Add BIMC logging support during kernel panic

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Add support to send BIMC logging request to AOP using QMP
Mailbox Client during kernel panic.

Change-Id: I21f3c67496064a5ff70a890cdaadfff5ab39b002
Signed-off-by: Jagadeesh Kona <jkona@codeaurora.org>
This commit is contained in:
Jagadeesh Kona 2020-07-29 23:07:57 +05:30
commit 5074ac0f45
1 changed files with 39 additions and 1 deletions
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40
drivers/clk/qcom/clk-aop-qmp.c
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@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
* Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
@ -13,6 +13,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/mailbox_client.h>
#include <linux/mailbox_controller.h>
#include <dt-bindings/clock/qcom,aop-qmp.h>
#define MAX_LEN 96
@ -217,10 +218,43 @@ DEFINE_CLK_AOP_QMP(qdss_qmp_clk, clock, qdss, QDSS_CLK_LEVEL_DYNAMIC,
QDSS_CLK_LEVEL_OFF, 0);
DEFINE_CLK_AOP_QMP(qdss_ao_qmp_clk, clock, qdss_ao, QDSS_CLK_LEVEL_DYNAMIC,
QDSS_CLK_LEVEL_OFF, 0);
DEFINE_CLK_AOP_QMP(bimc_qmp_clk, ddr, ddr_log, 1, 0, 0);
static struct clk_hw *aop_qmp_clk_hws[] = {
[QDSS_CLK] = &qdss_qmp_clk.hw,
[QDSS_AO_CLK] = &qdss_ao_qmp_clk.hw,
[BIMC_CLK] = &bimc_qmp_clk.hw,
};
static int aop_qmp_clk_panic_callback(struct notifier_block *nfb,
unsigned long event, void *unused)
{
struct qmp_pkt pkt;
struct clk_aop_qmp *clk = &bimc_qmp_clk;
char mbox_msg[MAX_LEN];
int ret;
/*
* The mbox channel cannot be used in blocking mode as panic notifier
* callback function is called in atomic context. So update the channel
* to non-blocking mode before sending message.
*/
clk->mbox->cl->tx_block = false;
snprintf(mbox_msg, MAX_LEN, "{class: %s, res: %s, val: 0}",
clk->msg.class, clk->msg.res);
pkt.size = MAX_LEN;
pkt.data = mbox_msg;
ret = mbox_send_message(clk->mbox, &pkt);
if (ret < 0)
pr_err("BIMC logging request failed, ret %d\n", ret);
return NOTIFY_OK;
}
static struct notifier_block aop_qmp_clk_panic_notifier = {
.notifier_call = aop_qmp_clk_panic_callback,
.priority = 1,
};
static int qmp_update_client(struct clk_hw *hw, struct device *dev,
@ -320,6 +354,10 @@ static int aop_qmp_clk_probe(struct platform_device *pdev)
dev_info(&pdev->dev, "Registered clocks with AOP\n");
if (of_property_read_bool(np, "qcom,clk-stop-bimc-log"))
atomic_notifier_chain_register(&panic_notifier_list,
&aop_qmp_clk_panic_notifier);
return ret;
fail:
mbox_free_channel(mbox);