Merge "drivers: soc: system_health_monitor: Rate-limit the system health check" (674b5bfc) · Commits · e / devices / android_kernel_sony_msm8994

drivers/soc/qcom/system_health_monitor.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,7 @@
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/qmi_encdec.h>
		#include <linux/ratelimit.h>
		#include <linux/sched.h>
		#include <linux/slab.h>
		#include <linux/srcu.h>
		@@ -48,6 +49,9 @@ static int shm_default_timeout_ms = 2000;
		module_param_named(default_timeout_ms, shm_default_timeout_ms,
		int, S_IRUGO \| S_IWUSR \| S_IWGRP);

		#define DEFAULT_SHM_RATELIMIT_INTERVAL (HZ / 5)
		#define DEFAULT_SHM_RATELIMIT_BURST 2

		#define SHM_ILCTXT_NUM_PAGES 2
		static void *shm_ilctxt;
		#define SHM_INFO(x...) do { \
		@@ -109,6 +113,7 @@ static void shm_svc_req_worker(struct work_struct *work);
		* @is_in_reset: Flag to identify if the remote subsystem is in reset.
		* @restart_nb: Notifier block to receive subsystem restart events.
		* @restart_nb_h: Handle to subsystem restart notifier block.
		* @rs: Rate-limit the health check.
		*/
		struct hma_info {
		struct list_head list;
		@@ -122,6 +127,7 @@ struct hma_info {
		atomic_t is_in_reset;
		struct notifier_block restart_nb;
		void *restart_nb_h;
		struct ratelimit_state rs;
		};

		struct restart_work {
		@@ -267,6 +273,10 @@ static int shm_send_health_check_ind(struct hma_info *tmp_hma_info)
		if (!tmp_hma_info->conn_h)
		return 0;

		/* Rate limit the health check as configured by the subsystem */
		if (!__ratelimit(&tmp_hma_info->rs))
		return 0;

		rwp = kzalloc(sizeof(*rwp), GFP_KERNEL);
		if (!rwp) {
		SHM_ERR("%s: Error allocating restart work\n", __func__);
		@@ -450,6 +460,9 @@ static int handle_health_mon_reg_req(void conn_h, void req_h, void *buf)
		tmp_hma_info->timeout = req->timeout;
		else
		tmp_hma_info->timeout = shm_default_timeout_ms;
		ratelimit_state_init(&tmp_hma_info->rs,
		DEFAULT_SHM_RATELIMIT_INTERVAL,
		DEFAULT_SHM_RATELIMIT_BURST);
		SHM_INFO("%s: from %s timeout_ms %d\n",
		__func__, req->name, tmp_hma_info->timeout);
		hma_info_found = true;