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Message-Id: <20230609022240.1694244-4-jcmvbkbc@gmail.com>
Date: Thu, 8 Jun 2023 19:22:38 -0700
From: Max Filippov <jcmvbkbc@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Chris Zankel <chris@...kel.net>, Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH 3/5] xtensa: drop platform_restart
Instead of using xtensa-specific platform_restart callback use
do_kernel_restart in the machine_restart implementation and reimplement
existing platform_restart users with register_restart_handler.
Drop platform_restart declaration and default implementation.
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
arch/xtensa/include/asm/platform.h | 5 -----
arch/xtensa/kernel/platform.c | 1 -
arch/xtensa/kernel/setup.c | 8 +++++++-
arch/xtensa/platforms/iss/setup.c | 12 ++++++++++--
arch/xtensa/platforms/xt2000/setup.c | 11 +++++++++--
arch/xtensa/platforms/xtfpga/setup.c | 20 ++++++++++++++++++--
6 files changed, 44 insertions(+), 13 deletions(-)
diff --git a/arch/xtensa/include/asm/platform.h b/arch/xtensa/include/asm/platform.h
index 3be6b4bf9763..5b3c1f96f7b5 100644
--- a/arch/xtensa/include/asm/platform.h
+++ b/arch/xtensa/include/asm/platform.h
@@ -27,11 +27,6 @@ extern void platform_init(bp_tag_t*);
*/
extern void platform_setup (char **);
-/*
- * platform_restart is called to restart the system.
- */
-extern void platform_restart (void);
-
/*
* platform_halt is called to stop the system and halt.
*/
diff --git a/arch/xtensa/kernel/platform.c b/arch/xtensa/kernel/platform.c
index bb4d426ebb44..526ab744271f 100644
--- a/arch/xtensa/kernel/platform.c
+++ b/arch/xtensa/kernel/platform.c
@@ -28,7 +28,6 @@
_F(void, init, (bp_tag_t *first), { });
_F(void, setup, (char** cmd), { });
-_F(void, restart, (void), { while(1); });
_F(void, halt, (void), { while(1); });
_F(void, power_off, (void), { while(1); });
_F(void, idle, (void), { __asm__ __volatile__ ("waiti 0" ::: "memory"); });
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 9191738f9941..8f72039335c2 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -22,6 +22,7 @@
#include <linux/screen_info.h>
#include <linux/kernel.h>
#include <linux/percpu.h>
+#include <linux/reboot.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
@@ -522,7 +523,12 @@ void cpu_reset(void)
void machine_restart(char * cmd)
{
- platform_restart();
+ local_irq_disable();
+ smp_send_stop();
+ do_kernel_restart(cmd);
+ pr_err("Reboot failed -- System halted\n");
+ while (1)
+ cpu_relax();
}
void machine_halt(void)
diff --git a/arch/xtensa/platforms/iss/setup.c b/arch/xtensa/platforms/iss/setup.c
index d3433e1bb94e..a7009f223ef2 100644
--- a/arch/xtensa/platforms/iss/setup.c
+++ b/arch/xtensa/platforms/iss/setup.c
@@ -16,6 +16,7 @@
#include <linux/notifier.h>
#include <linux/panic_notifier.h>
#include <linux/printk.h>
+#include <linux/reboot.h>
#include <linux/string.h>
#include <asm/platform.h>
@@ -36,14 +37,20 @@ void platform_power_off(void)
simc_exit(0);
}
-void platform_restart(void)
+static int iss_restart(struct notifier_block *this,
+ unsigned long event, void *ptr)
{
/* Flush and reset the mmu, simulate a processor reset, and
* jump to the reset vector. */
cpu_reset();
- /* control never gets here */
+
+ return NOTIFY_DONE;
}
+static struct notifier_block iss_restart_block = {
+ .notifier_call = iss_restart,
+};
+
static int
iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
@@ -82,4 +89,5 @@ void __init platform_setup(char **p_cmdline)
}
atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
+ register_restart_handler(&iss_restart_block);
}
diff --git a/arch/xtensa/platforms/xt2000/setup.c b/arch/xtensa/platforms/xt2000/setup.c
index dc187684203b..71b57ab50599 100644
--- a/arch/xtensa/platforms/xt2000/setup.c
+++ b/arch/xtensa/platforms/xt2000/setup.c
@@ -56,14 +56,20 @@ void platform_power_off(void)
while (1);
}
-void platform_restart(void)
+static int xt2000_restart(struct notifier_block *this,
+ unsigned long event, void *ptr)
{
/* Flush and reset the mmu, simulate a processor reset, and
* jump to the reset vector. */
cpu_reset();
- /* control never gets here */
+
+ return NOTIFY_DONE;
}
+static struct notifier_block xt2000_restart_block = {
+ .notifier_call = xt2000_restart,
+};
+
void __init platform_setup(char** cmdline)
{
led_print (0, "LINUX ");
@@ -140,6 +146,7 @@ static int __init xt2000_setup_devinit(void)
platform_device_register(&xt2000_serial8250_device);
platform_device_register(&xt2000_sonic_device);
mod_timer(&heartbeat_timer, jiffies + HZ / 2);
+ register_restart_handler(&xt2000_restart_block);
return 0;
}
diff --git a/arch/xtensa/platforms/xtfpga/setup.c b/arch/xtensa/platforms/xtfpga/setup.c
index c79c1d09ea86..1690232c003e 100644
--- a/arch/xtensa/platforms/xtfpga/setup.c
+++ b/arch/xtensa/platforms/xtfpga/setup.c
@@ -49,7 +49,8 @@ void platform_power_off(void)
cpu_relax();
}
-void platform_restart(void)
+static int xtfpga_restart(struct notifier_block *this,
+ unsigned long event, void *ptr)
{
/* Try software reset first. */
WRITE_ONCE(*(u32 *)XTFPGA_SWRST_VADDR, 0xdead);
@@ -58,9 +59,14 @@ void platform_restart(void)
* simulate a processor reset, and jump to the reset vector.
*/
cpu_reset();
- /* control never gets here */
+
+ return NOTIFY_DONE;
}
+static struct notifier_block xtfpga_restart_block = {
+ .notifier_call = xtfpga_restart,
+};
+
#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
void __init platform_calibrate_ccount(void)
@@ -70,6 +76,11 @@ void __init platform_calibrate_ccount(void)
#endif
+static void __init xtfpga_register_handlers(void)
+{
+ register_restart_handler(&xtfpga_restart_block);
+}
+
#ifdef CONFIG_USE_OF
static void __init xtfpga_clk_setup(struct device_node *np)
@@ -134,6 +145,9 @@ static int __init machine_setup(void)
if ((eth = of_find_compatible_node(eth, NULL, "opencores,ethoc")))
update_local_mac(eth);
of_node_put(eth);
+
+ xtfpga_register_handlers();
+
return 0;
}
arch_initcall(machine_setup);
@@ -281,6 +295,8 @@ static int __init xtavnet_init(void)
pr_info("XTFPGA: Ethernet MAC %pM\n", ethoc_pdata.hwaddr);
ethoc_pdata.eth_clkfreq = *(long *)XTFPGA_CLKFRQ_VADDR;
+ xtfpga_register_handlers();
+
return 0;
}
--
2.30.2
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