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![Leonardo Bras](/assets/img/avatar_default.png)
Implement rtas_call_reentrant() for reentrant rtas-calls: "ibm,int-on", "ibm,int-off",ibm,get-xive" and "ibm,set-xive". On LoPAPR Version 1.1 (March 24, 2016), from 7.3.10.1 to 7.3.10.4, items 2 and 3 say: 2 - For the PowerPC External Interrupt option: The * call must be reentrant to the number of processors on the platform. 3 - For the PowerPC External Interrupt option: The * argument call buffer for each simultaneous call must be physically unique. So, these rtas-calls can be called in a lockless way, if using a different buffer for each cpu doing such rtas call. For this, it was suggested to add the buffer (struct rtas_args) in the PACA struct, so each cpu can have it's own buffer. The PACA struct received a pointer to rtas buffer, which is allocated in the memory range available to rtas 32-bit. Reentrant rtas calls are useful to avoid deadlocks in crashing, where rtas-calls are needed, but some other thread crashed holding the rtas.lock. This is a backtrace of a deadlock from a kdump testing environment: #0 arch_spin_lock #1 lock_rtas () #2 rtas_call (token=8204, nargs=1, nret=1, outputs=0x0) #3 ics_rtas_mask_real_irq (hw_irq=4100) #4 machine_kexec_mask_interrupts #5 default_machine_crash_shutdown #6 machine_crash_shutdown #7 __crash_kexec #8 crash_kexec #9 oops_end Signed-off-by: Leonardo Bras <leobras.c@gmail.com> [mpe: Move under #ifdef PSERIES to avoid build breakage] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200518234245.200672-3-leobras.c@gmail.com
1317 lines
30 KiB
C
1317 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Procedures for interfacing to the RTAS on CHRP machines.
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*
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* Peter Bergner, IBM March 2001.
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* Copyright (C) 2001 IBM.
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*/
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#include <stdarg.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/capability.h>
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#include <linux/delay.h>
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#include <linux/cpu.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/completion.h>
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#include <linux/cpumask.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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#include <linux/reboot.h>
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#include <linux/syscalls.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/hvcall.h>
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#include <asm/machdep.h>
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#include <asm/firmware.h>
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#include <asm/page.h>
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#include <asm/param.h>
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#include <asm/delay.h>
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#include <linux/uaccess.h>
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#include <asm/udbg.h>
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#include <asm/syscalls.h>
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#include <asm/smp.h>
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#include <linux/atomic.h>
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#include <asm/time.h>
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#include <asm/mmu.h>
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#include <asm/topology.h>
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#include <asm/paca.h>
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/* This is here deliberately so it's only used in this file */
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void enter_rtas(unsigned long);
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struct rtas_t rtas = {
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.lock = __ARCH_SPIN_LOCK_UNLOCKED
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};
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EXPORT_SYMBOL(rtas);
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DEFINE_SPINLOCK(rtas_data_buf_lock);
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EXPORT_SYMBOL(rtas_data_buf_lock);
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char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
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EXPORT_SYMBOL(rtas_data_buf);
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unsigned long rtas_rmo_buf;
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/*
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* If non-NULL, this gets called when the kernel terminates.
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* This is done like this so rtas_flash can be a module.
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*/
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void (*rtas_flash_term_hook)(int);
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EXPORT_SYMBOL(rtas_flash_term_hook);
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/* RTAS use home made raw locking instead of spin_lock_irqsave
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* because those can be called from within really nasty contexts
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* such as having the timebase stopped which would lockup with
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* normal locks and spinlock debugging enabled
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*/
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static unsigned long lock_rtas(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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preempt_disable();
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arch_spin_lock(&rtas.lock);
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return flags;
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}
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static void unlock_rtas(unsigned long flags)
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{
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arch_spin_unlock(&rtas.lock);
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local_irq_restore(flags);
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preempt_enable();
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}
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/*
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* call_rtas_display_status and call_rtas_display_status_delay
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* are designed only for very early low-level debugging, which
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* is why the token is hard-coded to 10.
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*/
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static void call_rtas_display_status(unsigned char c)
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{
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unsigned long s;
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if (!rtas.base)
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return;
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s = lock_rtas();
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rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
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unlock_rtas(s);
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}
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static void call_rtas_display_status_delay(char c)
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{
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static int pending_newline = 0; /* did last write end with unprinted newline? */
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static int width = 16;
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if (c == '\n') {
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while (width-- > 0)
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call_rtas_display_status(' ');
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width = 16;
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mdelay(500);
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pending_newline = 1;
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} else {
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if (pending_newline) {
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call_rtas_display_status('\r');
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call_rtas_display_status('\n');
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}
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pending_newline = 0;
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if (width--) {
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call_rtas_display_status(c);
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udelay(10000);
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}
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}
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}
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void __init udbg_init_rtas_panel(void)
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{
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udbg_putc = call_rtas_display_status_delay;
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}
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#ifdef CONFIG_UDBG_RTAS_CONSOLE
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/* If you think you're dying before early_init_dt_scan_rtas() does its
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* work, you can hard code the token values for your firmware here and
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* hardcode rtas.base/entry etc.
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*/
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static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
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static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
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static void udbg_rtascon_putc(char c)
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{
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int tries;
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if (!rtas.base)
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return;
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/* Add CRs before LFs */
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if (c == '\n')
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udbg_rtascon_putc('\r');
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/* if there is more than one character to be displayed, wait a bit */
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for (tries = 0; tries < 16; tries++) {
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if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
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break;
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udelay(1000);
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}
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}
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static int udbg_rtascon_getc_poll(void)
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{
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int c;
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if (!rtas.base)
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return -1;
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if (rtas_call(rtas_getchar_token, 0, 2, &c))
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return -1;
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return c;
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}
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static int udbg_rtascon_getc(void)
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{
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int c;
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while ((c = udbg_rtascon_getc_poll()) == -1)
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;
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return c;
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}
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void __init udbg_init_rtas_console(void)
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{
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udbg_putc = udbg_rtascon_putc;
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udbg_getc = udbg_rtascon_getc;
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udbg_getc_poll = udbg_rtascon_getc_poll;
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}
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#endif /* CONFIG_UDBG_RTAS_CONSOLE */
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void rtas_progress(char *s, unsigned short hex)
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{
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struct device_node *root;
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int width;
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const __be32 *p;
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char *os;
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static int display_character, set_indicator;
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static int display_width, display_lines, form_feed;
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static const int *row_width;
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static DEFINE_SPINLOCK(progress_lock);
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static int current_line;
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static int pending_newline = 0; /* did last write end with unprinted newline? */
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if (!rtas.base)
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return;
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if (display_width == 0) {
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display_width = 0x10;
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if ((root = of_find_node_by_path("/rtas"))) {
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if ((p = of_get_property(root,
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"ibm,display-line-length", NULL)))
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display_width = be32_to_cpu(*p);
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if ((p = of_get_property(root,
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"ibm,form-feed", NULL)))
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form_feed = be32_to_cpu(*p);
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if ((p = of_get_property(root,
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"ibm,display-number-of-lines", NULL)))
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display_lines = be32_to_cpu(*p);
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row_width = of_get_property(root,
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"ibm,display-truncation-length", NULL);
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of_node_put(root);
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}
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display_character = rtas_token("display-character");
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set_indicator = rtas_token("set-indicator");
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}
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if (display_character == RTAS_UNKNOWN_SERVICE) {
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/* use hex display if available */
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if (set_indicator != RTAS_UNKNOWN_SERVICE)
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rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
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return;
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}
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spin_lock(&progress_lock);
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/*
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* Last write ended with newline, but we didn't print it since
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* it would just clear the bottom line of output. Print it now
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* instead.
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*
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* If no newline is pending and form feed is supported, clear the
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* display with a form feed; otherwise, print a CR to start output
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* at the beginning of the line.
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*/
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if (pending_newline) {
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rtas_call(display_character, 1, 1, NULL, '\r');
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rtas_call(display_character, 1, 1, NULL, '\n');
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pending_newline = 0;
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} else {
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current_line = 0;
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if (form_feed)
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rtas_call(display_character, 1, 1, NULL,
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(char)form_feed);
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else
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rtas_call(display_character, 1, 1, NULL, '\r');
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}
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if (row_width)
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width = row_width[current_line];
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else
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width = display_width;
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os = s;
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while (*os) {
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if (*os == '\n' || *os == '\r') {
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/* If newline is the last character, save it
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* until next call to avoid bumping up the
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* display output.
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*/
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if (*os == '\n' && !os[1]) {
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pending_newline = 1;
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current_line++;
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if (current_line > display_lines-1)
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current_line = display_lines-1;
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spin_unlock(&progress_lock);
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return;
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}
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/* RTAS wants CR-LF, not just LF */
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if (*os == '\n') {
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rtas_call(display_character, 1, 1, NULL, '\r');
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rtas_call(display_character, 1, 1, NULL, '\n');
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} else {
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/* CR might be used to re-draw a line, so we'll
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* leave it alone and not add LF.
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*/
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rtas_call(display_character, 1, 1, NULL, *os);
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}
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if (row_width)
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width = row_width[current_line];
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else
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width = display_width;
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} else {
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width--;
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rtas_call(display_character, 1, 1, NULL, *os);
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}
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os++;
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/* if we overwrite the screen length */
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if (width <= 0)
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while ((*os != 0) && (*os != '\n') && (*os != '\r'))
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os++;
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}
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spin_unlock(&progress_lock);
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}
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EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
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int rtas_token(const char *service)
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{
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const __be32 *tokp;
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if (rtas.dev == NULL)
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return RTAS_UNKNOWN_SERVICE;
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tokp = of_get_property(rtas.dev, service, NULL);
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return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE;
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}
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EXPORT_SYMBOL(rtas_token);
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int rtas_service_present(const char *service)
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{
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return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
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}
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EXPORT_SYMBOL(rtas_service_present);
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#ifdef CONFIG_RTAS_ERROR_LOGGING
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/*
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* Return the firmware-specified size of the error log buffer
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* for all rtas calls that require an error buffer argument.
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* This includes 'check-exception' and 'rtas-last-error'.
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*/
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int rtas_get_error_log_max(void)
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{
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static int rtas_error_log_max;
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if (rtas_error_log_max)
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return rtas_error_log_max;
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rtas_error_log_max = rtas_token ("rtas-error-log-max");
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if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
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(rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
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printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
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rtas_error_log_max);
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rtas_error_log_max = RTAS_ERROR_LOG_MAX;
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}
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return rtas_error_log_max;
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}
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EXPORT_SYMBOL(rtas_get_error_log_max);
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static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
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static int rtas_last_error_token;
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/** Return a copy of the detailed error text associated with the
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* most recent failed call to rtas. Because the error text
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* might go stale if there are any other intervening rtas calls,
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* this routine must be called atomically with whatever produced
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* the error (i.e. with rtas.lock still held from the previous call).
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*/
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static char *__fetch_rtas_last_error(char *altbuf)
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{
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struct rtas_args err_args, save_args;
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u32 bufsz;
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char *buf = NULL;
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if (rtas_last_error_token == -1)
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return NULL;
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bufsz = rtas_get_error_log_max();
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err_args.token = cpu_to_be32(rtas_last_error_token);
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err_args.nargs = cpu_to_be32(2);
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err_args.nret = cpu_to_be32(1);
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err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf));
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err_args.args[1] = cpu_to_be32(bufsz);
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err_args.args[2] = 0;
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save_args = rtas.args;
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rtas.args = err_args;
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enter_rtas(__pa(&rtas.args));
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err_args = rtas.args;
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rtas.args = save_args;
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/* Log the error in the unlikely case that there was one. */
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if (unlikely(err_args.args[2] == 0)) {
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if (altbuf) {
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buf = altbuf;
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} else {
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buf = rtas_err_buf;
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if (slab_is_available())
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buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
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}
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if (buf)
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memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
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}
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return buf;
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}
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#define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
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#else /* CONFIG_RTAS_ERROR_LOGGING */
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#define __fetch_rtas_last_error(x) NULL
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#define get_errorlog_buffer() NULL
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#endif
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static void
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va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
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va_list list)
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{
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int i;
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args->token = cpu_to_be32(token);
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args->nargs = cpu_to_be32(nargs);
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args->nret = cpu_to_be32(nret);
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args->rets = &(args->args[nargs]);
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for (i = 0; i < nargs; ++i)
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args->args[i] = cpu_to_be32(va_arg(list, __u32));
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for (i = 0; i < nret; ++i)
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args->rets[i] = 0;
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enter_rtas(__pa(args));
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}
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void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
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{
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va_list list;
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va_start(list, nret);
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va_rtas_call_unlocked(args, token, nargs, nret, list);
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va_end(list);
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}
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int rtas_call(int token, int nargs, int nret, int *outputs, ...)
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{
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va_list list;
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int i;
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unsigned long s;
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struct rtas_args *rtas_args;
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char *buff_copy = NULL;
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int ret;
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if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
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return -1;
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s = lock_rtas();
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/* We use the global rtas args buffer */
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rtas_args = &rtas.args;
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va_start(list, outputs);
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va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
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va_end(list);
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/* A -1 return code indicates that the last command couldn't
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be completed due to a hardware error. */
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if (be32_to_cpu(rtas_args->rets[0]) == -1)
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buff_copy = __fetch_rtas_last_error(NULL);
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if (nret > 1 && outputs != NULL)
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for (i = 0; i < nret-1; ++i)
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outputs[i] = be32_to_cpu(rtas_args->rets[i+1]);
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ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0;
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unlock_rtas(s);
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if (buff_copy) {
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log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
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if (slab_is_available())
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kfree(buff_copy);
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}
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return ret;
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}
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EXPORT_SYMBOL(rtas_call);
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/* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
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* code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
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|
*/
|
|
unsigned int rtas_busy_delay_time(int status)
|
|
{
|
|
int order;
|
|
unsigned int ms = 0;
|
|
|
|
if (status == RTAS_BUSY) {
|
|
ms = 1;
|
|
} else if (status >= RTAS_EXTENDED_DELAY_MIN &&
|
|
status <= RTAS_EXTENDED_DELAY_MAX) {
|
|
order = status - RTAS_EXTENDED_DELAY_MIN;
|
|
for (ms = 1; order > 0; order--)
|
|
ms *= 10;
|
|
}
|
|
|
|
return ms;
|
|
}
|
|
EXPORT_SYMBOL(rtas_busy_delay_time);
|
|
|
|
/* For an RTAS busy status code, perform the hinted delay. */
|
|
unsigned int rtas_busy_delay(int status)
|
|
{
|
|
unsigned int ms;
|
|
|
|
might_sleep();
|
|
ms = rtas_busy_delay_time(status);
|
|
if (ms && need_resched())
|
|
msleep(ms);
|
|
|
|
return ms;
|
|
}
|
|
EXPORT_SYMBOL(rtas_busy_delay);
|
|
|
|
static int rtas_error_rc(int rtas_rc)
|
|
{
|
|
int rc;
|
|
|
|
switch (rtas_rc) {
|
|
case -1: /* Hardware Error */
|
|
rc = -EIO;
|
|
break;
|
|
case -3: /* Bad indicator/domain/etc */
|
|
rc = -EINVAL;
|
|
break;
|
|
case -9000: /* Isolation error */
|
|
rc = -EFAULT;
|
|
break;
|
|
case -9001: /* Outstanding TCE/PTE */
|
|
rc = -EEXIST;
|
|
break;
|
|
case -9002: /* No usable slot */
|
|
rc = -ENODEV;
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "%s: unexpected RTAS error %d\n",
|
|
__func__, rtas_rc);
|
|
rc = -ERANGE;
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int rtas_get_power_level(int powerdomain, int *level)
|
|
{
|
|
int token = rtas_token("get-power-level");
|
|
int rc;
|
|
|
|
if (token == RTAS_UNKNOWN_SERVICE)
|
|
return -ENOENT;
|
|
|
|
while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
|
|
udelay(1);
|
|
|
|
if (rc < 0)
|
|
return rtas_error_rc(rc);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(rtas_get_power_level);
|
|
|
|
int rtas_set_power_level(int powerdomain, int level, int *setlevel)
|
|
{
|
|
int token = rtas_token("set-power-level");
|
|
int rc;
|
|
|
|
if (token == RTAS_UNKNOWN_SERVICE)
|
|
return -ENOENT;
|
|
|
|
do {
|
|
rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
|
|
} while (rtas_busy_delay(rc));
|
|
|
|
if (rc < 0)
|
|
return rtas_error_rc(rc);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(rtas_set_power_level);
|
|
|
|
int rtas_get_sensor(int sensor, int index, int *state)
|
|
{
|
|
int token = rtas_token("get-sensor-state");
|
|
int rc;
|
|
|
|
if (token == RTAS_UNKNOWN_SERVICE)
|
|
return -ENOENT;
|
|
|
|
do {
|
|
rc = rtas_call(token, 2, 2, state, sensor, index);
|
|
} while (rtas_busy_delay(rc));
|
|
|
|
if (rc < 0)
|
|
return rtas_error_rc(rc);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(rtas_get_sensor);
|
|
|
|
int rtas_get_sensor_fast(int sensor, int index, int *state)
|
|
{
|
|
int token = rtas_token("get-sensor-state");
|
|
int rc;
|
|
|
|
if (token == RTAS_UNKNOWN_SERVICE)
|
|
return -ENOENT;
|
|
|
|
rc = rtas_call(token, 2, 2, state, sensor, index);
|
|
WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
|
|
rc <= RTAS_EXTENDED_DELAY_MAX));
|
|
|
|
if (rc < 0)
|
|
return rtas_error_rc(rc);
|
|
return rc;
|
|
}
|
|
|
|
bool rtas_indicator_present(int token, int *maxindex)
|
|
{
|
|
int proplen, count, i;
|
|
const struct indicator_elem {
|
|
__be32 token;
|
|
__be32 maxindex;
|
|
} *indicators;
|
|
|
|
indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
|
|
if (!indicators)
|
|
return false;
|
|
|
|
count = proplen / sizeof(struct indicator_elem);
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (__be32_to_cpu(indicators[i].token) != token)
|
|
continue;
|
|
if (maxindex)
|
|
*maxindex = __be32_to_cpu(indicators[i].maxindex);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(rtas_indicator_present);
|
|
|
|
int rtas_set_indicator(int indicator, int index, int new_value)
|
|
{
|
|
int token = rtas_token("set-indicator");
|
|
int rc;
|
|
|
|
if (token == RTAS_UNKNOWN_SERVICE)
|
|
return -ENOENT;
|
|
|
|
do {
|
|
rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
|
|
} while (rtas_busy_delay(rc));
|
|
|
|
if (rc < 0)
|
|
return rtas_error_rc(rc);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(rtas_set_indicator);
|
|
|
|
/*
|
|
* Ignoring RTAS extended delay
|
|
*/
|
|
int rtas_set_indicator_fast(int indicator, int index, int new_value)
|
|
{
|
|
int rc;
|
|
int token = rtas_token("set-indicator");
|
|
|
|
if (token == RTAS_UNKNOWN_SERVICE)
|
|
return -ENOENT;
|
|
|
|
rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
|
|
|
|
WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
|
|
rc <= RTAS_EXTENDED_DELAY_MAX));
|
|
|
|
if (rc < 0)
|
|
return rtas_error_rc(rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
void __noreturn rtas_restart(char *cmd)
|
|
{
|
|
if (rtas_flash_term_hook)
|
|
rtas_flash_term_hook(SYS_RESTART);
|
|
printk("RTAS system-reboot returned %d\n",
|
|
rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
|
|
for (;;);
|
|
}
|
|
|
|
void rtas_power_off(void)
|
|
{
|
|
if (rtas_flash_term_hook)
|
|
rtas_flash_term_hook(SYS_POWER_OFF);
|
|
/* allow power on only with power button press */
|
|
printk("RTAS power-off returned %d\n",
|
|
rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
|
|
for (;;);
|
|
}
|
|
|
|
void __noreturn rtas_halt(void)
|
|
{
|
|
if (rtas_flash_term_hook)
|
|
rtas_flash_term_hook(SYS_HALT);
|
|
/* allow power on only with power button press */
|
|
printk("RTAS power-off returned %d\n",
|
|
rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
|
|
for (;;);
|
|
}
|
|
|
|
/* Must be in the RMO region, so we place it here */
|
|
static char rtas_os_term_buf[2048];
|
|
|
|
void rtas_os_term(char *str)
|
|
{
|
|
int status;
|
|
|
|
/*
|
|
* Firmware with the ibm,extended-os-term property is guaranteed
|
|
* to always return from an ibm,os-term call. Earlier versions without
|
|
* this property may terminate the partition which we want to avoid
|
|
* since it interferes with panic_timeout.
|
|
*/
|
|
if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
|
|
RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
|
|
return;
|
|
|
|
snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
|
|
|
|
do {
|
|
status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
|
|
__pa(rtas_os_term_buf));
|
|
} while (rtas_busy_delay(status));
|
|
|
|
if (status != 0)
|
|
printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
|
|
}
|
|
|
|
static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
|
|
{
|
|
u16 slb_size = mmu_slb_size;
|
|
int rc = H_MULTI_THREADS_ACTIVE;
|
|
int cpu;
|
|
|
|
slb_set_size(SLB_MIN_SIZE);
|
|
printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
|
|
|
|
while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
|
|
!atomic_read(&data->error))
|
|
rc = rtas_call(data->token, 0, 1, NULL);
|
|
|
|
if (rc || atomic_read(&data->error)) {
|
|
printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
|
|
slb_set_size(slb_size);
|
|
}
|
|
|
|
if (atomic_read(&data->error))
|
|
rc = atomic_read(&data->error);
|
|
|
|
atomic_set(&data->error, rc);
|
|
pSeries_coalesce_init();
|
|
|
|
if (wake_when_done) {
|
|
atomic_set(&data->done, 1);
|
|
|
|
for_each_online_cpu(cpu)
|
|
plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
|
|
}
|
|
|
|
if (atomic_dec_return(&data->working) == 0)
|
|
complete(data->complete);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
|
|
{
|
|
atomic_inc(&data->working);
|
|
return __rtas_suspend_last_cpu(data, 0);
|
|
}
|
|
|
|
static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
|
|
{
|
|
long rc = H_SUCCESS;
|
|
unsigned long msr_save;
|
|
int cpu;
|
|
|
|
atomic_inc(&data->working);
|
|
|
|
/* really need to ensure MSR.EE is off for H_JOIN */
|
|
msr_save = mfmsr();
|
|
mtmsr(msr_save & ~(MSR_EE));
|
|
|
|
while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
|
|
rc = plpar_hcall_norets(H_JOIN);
|
|
|
|
mtmsr(msr_save);
|
|
|
|
if (rc == H_SUCCESS) {
|
|
/* This cpu was prodded and the suspend is complete. */
|
|
goto out;
|
|
} else if (rc == H_CONTINUE) {
|
|
/* All other cpus are in H_JOIN, this cpu does
|
|
* the suspend.
|
|
*/
|
|
return __rtas_suspend_last_cpu(data, wake_when_done);
|
|
} else {
|
|
printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
|
|
smp_processor_id(), rc);
|
|
atomic_set(&data->error, rc);
|
|
}
|
|
|
|
if (wake_when_done) {
|
|
atomic_set(&data->done, 1);
|
|
|
|
/* This cpu did the suspend or got an error; in either case,
|
|
* we need to prod all other other cpus out of join state.
|
|
* Extra prods are harmless.
|
|
*/
|
|
for_each_online_cpu(cpu)
|
|
plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
|
|
}
|
|
out:
|
|
if (atomic_dec_return(&data->working) == 0)
|
|
complete(data->complete);
|
|
return rc;
|
|
}
|
|
|
|
int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
|
|
{
|
|
return __rtas_suspend_cpu(data, 0);
|
|
}
|
|
|
|
static void rtas_percpu_suspend_me(void *info)
|
|
{
|
|
__rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
|
|
}
|
|
|
|
enum rtas_cpu_state {
|
|
DOWN,
|
|
UP,
|
|
};
|
|
|
|
#ifndef CONFIG_SMP
|
|
static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
|
|
cpumask_var_t cpus)
|
|
{
|
|
if (!cpumask_empty(cpus)) {
|
|
cpumask_clear(cpus);
|
|
return -EINVAL;
|
|
} else
|
|
return 0;
|
|
}
|
|
#else
|
|
/* On return cpumask will be altered to indicate CPUs changed.
|
|
* CPUs with states changed will be set in the mask,
|
|
* CPUs with status unchanged will be unset in the mask. */
|
|
static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
|
|
cpumask_var_t cpus)
|
|
{
|
|
int cpu;
|
|
int cpuret = 0;
|
|
int ret = 0;
|
|
|
|
if (cpumask_empty(cpus))
|
|
return 0;
|
|
|
|
for_each_cpu(cpu, cpus) {
|
|
struct device *dev = get_cpu_device(cpu);
|
|
|
|
switch (state) {
|
|
case DOWN:
|
|
cpuret = device_offline(dev);
|
|
break;
|
|
case UP:
|
|
cpuret = device_online(dev);
|
|
break;
|
|
}
|
|
if (cpuret < 0) {
|
|
pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
|
|
__func__,
|
|
((state == UP) ? "up" : "down"),
|
|
cpu, cpuret);
|
|
if (!ret)
|
|
ret = cpuret;
|
|
if (state == UP) {
|
|
/* clear bits for unchanged cpus, return */
|
|
cpumask_shift_right(cpus, cpus, cpu);
|
|
cpumask_shift_left(cpus, cpus, cpu);
|
|
break;
|
|
} else {
|
|
/* clear bit for unchanged cpu, continue */
|
|
cpumask_clear_cpu(cpu, cpus);
|
|
}
|
|
}
|
|
cond_resched();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
int rtas_online_cpus_mask(cpumask_var_t cpus)
|
|
{
|
|
int ret;
|
|
|
|
ret = rtas_cpu_state_change_mask(UP, cpus);
|
|
|
|
if (ret) {
|
|
cpumask_var_t tmp_mask;
|
|
|
|
if (!alloc_cpumask_var(&tmp_mask, GFP_KERNEL))
|
|
return ret;
|
|
|
|
/* Use tmp_mask to preserve cpus mask from first failure */
|
|
cpumask_copy(tmp_mask, cpus);
|
|
rtas_offline_cpus_mask(tmp_mask);
|
|
free_cpumask_var(tmp_mask);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int rtas_offline_cpus_mask(cpumask_var_t cpus)
|
|
{
|
|
return rtas_cpu_state_change_mask(DOWN, cpus);
|
|
}
|
|
|
|
int rtas_ibm_suspend_me(u64 handle)
|
|
{
|
|
long state;
|
|
long rc;
|
|
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
|
|
struct rtas_suspend_me_data data;
|
|
DECLARE_COMPLETION_ONSTACK(done);
|
|
cpumask_var_t offline_mask;
|
|
int cpuret;
|
|
|
|
if (!rtas_service_present("ibm,suspend-me"))
|
|
return -ENOSYS;
|
|
|
|
/* Make sure the state is valid */
|
|
rc = plpar_hcall(H_VASI_STATE, retbuf, handle);
|
|
|
|
state = retbuf[0];
|
|
|
|
if (rc) {
|
|
printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
|
|
return rc;
|
|
} else if (state == H_VASI_ENABLED) {
|
|
return -EAGAIN;
|
|
} else if (state != H_VASI_SUSPENDING) {
|
|
printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
|
|
state);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!alloc_cpumask_var(&offline_mask, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
atomic_set(&data.working, 0);
|
|
atomic_set(&data.done, 0);
|
|
atomic_set(&data.error, 0);
|
|
data.token = rtas_token("ibm,suspend-me");
|
|
data.complete = &done;
|
|
|
|
lock_device_hotplug();
|
|
|
|
/* All present CPUs must be online */
|
|
cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
|
|
cpuret = rtas_online_cpus_mask(offline_mask);
|
|
if (cpuret) {
|
|
pr_err("%s: Could not bring present CPUs online.\n", __func__);
|
|
atomic_set(&data.error, cpuret);
|
|
goto out;
|
|
}
|
|
|
|
cpu_hotplug_disable();
|
|
|
|
/* Check if we raced with a CPU-Offline Operation */
|
|
if (!cpumask_equal(cpu_present_mask, cpu_online_mask)) {
|
|
pr_info("%s: Raced against a concurrent CPU-Offline\n", __func__);
|
|
atomic_set(&data.error, -EAGAIN);
|
|
goto out_hotplug_enable;
|
|
}
|
|
|
|
/* Call function on all CPUs. One of us will make the
|
|
* rtas call
|
|
*/
|
|
on_each_cpu(rtas_percpu_suspend_me, &data, 0);
|
|
|
|
wait_for_completion(&done);
|
|
|
|
if (atomic_read(&data.error) != 0)
|
|
printk(KERN_ERR "Error doing global join\n");
|
|
|
|
out_hotplug_enable:
|
|
cpu_hotplug_enable();
|
|
|
|
/* Take down CPUs not online prior to suspend */
|
|
cpuret = rtas_offline_cpus_mask(offline_mask);
|
|
if (cpuret)
|
|
pr_warn("%s: Could not restore CPUs to offline state.\n",
|
|
__func__);
|
|
|
|
out:
|
|
unlock_device_hotplug();
|
|
free_cpumask_var(offline_mask);
|
|
return atomic_read(&data.error);
|
|
}
|
|
|
|
/**
|
|
* rtas_call_reentrant() - Used for reentrant rtas calls
|
|
* @token: Token for desired reentrant RTAS call
|
|
* @nargs: Number of Input Parameters
|
|
* @nret: Number of Output Parameters
|
|
* @outputs: Array of outputs
|
|
* @...: Inputs for desired RTAS call
|
|
*
|
|
* According to LoPAR documentation, only "ibm,int-on", "ibm,int-off",
|
|
* "ibm,get-xive" and "ibm,set-xive" are currently reentrant.
|
|
* Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
|
|
* PACA one instead.
|
|
*
|
|
* Return: -1 on error,
|
|
* First output value of RTAS call if (nret > 0),
|
|
* 0 otherwise,
|
|
*/
|
|
int rtas_call_reentrant(int token, int nargs, int nret, int *outputs, ...)
|
|
{
|
|
va_list list;
|
|
struct rtas_args *args;
|
|
unsigned long flags;
|
|
int i, ret = 0;
|
|
|
|
if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
|
|
return -1;
|
|
|
|
local_irq_save(flags);
|
|
preempt_disable();
|
|
|
|
/* We use the per-cpu (PACA) rtas args buffer */
|
|
args = local_paca->rtas_args_reentrant;
|
|
|
|
va_start(list, outputs);
|
|
va_rtas_call_unlocked(args, token, nargs, nret, list);
|
|
va_end(list);
|
|
|
|
if (nret > 1 && outputs)
|
|
for (i = 0; i < nret - 1; ++i)
|
|
outputs[i] = be32_to_cpu(args->rets[i + 1]);
|
|
|
|
if (nret > 0)
|
|
ret = be32_to_cpu(args->rets[0]);
|
|
|
|
local_irq_restore(flags);
|
|
preempt_enable();
|
|
|
|
return ret;
|
|
}
|
|
|
|
#else /* CONFIG_PPC_PSERIES */
|
|
int rtas_ibm_suspend_me(u64 handle)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Find a specific pseries error log in an RTAS extended event log.
|
|
* @log: RTAS error/event log
|
|
* @section_id: two character section identifier
|
|
*
|
|
* Returns a pointer to the specified errorlog or NULL if not found.
|
|
*/
|
|
struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
|
|
uint16_t section_id)
|
|
{
|
|
struct rtas_ext_event_log_v6 *ext_log =
|
|
(struct rtas_ext_event_log_v6 *)log->buffer;
|
|
struct pseries_errorlog *sect;
|
|
unsigned char *p, *log_end;
|
|
uint32_t ext_log_length = rtas_error_extended_log_length(log);
|
|
uint8_t log_format = rtas_ext_event_log_format(ext_log);
|
|
uint32_t company_id = rtas_ext_event_company_id(ext_log);
|
|
|
|
/* Check that we understand the format */
|
|
if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
|
|
log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
|
|
company_id != RTAS_V6EXT_COMPANY_ID_IBM)
|
|
return NULL;
|
|
|
|
log_end = log->buffer + ext_log_length;
|
|
p = ext_log->vendor_log;
|
|
|
|
while (p < log_end) {
|
|
sect = (struct pseries_errorlog *)p;
|
|
if (pseries_errorlog_id(sect) == section_id)
|
|
return sect;
|
|
p += pseries_errorlog_length(sect);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* We assume to be passed big endian arguments */
|
|
SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
|
|
{
|
|
struct rtas_args args;
|
|
unsigned long flags;
|
|
char *buff_copy, *errbuf = NULL;
|
|
int nargs, nret, token;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!rtas.entry)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
|
|
return -EFAULT;
|
|
|
|
nargs = be32_to_cpu(args.nargs);
|
|
nret = be32_to_cpu(args.nret);
|
|
token = be32_to_cpu(args.token);
|
|
|
|
if (nargs >= ARRAY_SIZE(args.args)
|
|
|| nret > ARRAY_SIZE(args.args)
|
|
|| nargs + nret > ARRAY_SIZE(args.args))
|
|
return -EINVAL;
|
|
|
|
/* Copy in args. */
|
|
if (copy_from_user(args.args, uargs->args,
|
|
nargs * sizeof(rtas_arg_t)) != 0)
|
|
return -EFAULT;
|
|
|
|
if (token == RTAS_UNKNOWN_SERVICE)
|
|
return -EINVAL;
|
|
|
|
args.rets = &args.args[nargs];
|
|
memset(args.rets, 0, nret * sizeof(rtas_arg_t));
|
|
|
|
/* Need to handle ibm,suspend_me call specially */
|
|
if (token == ibm_suspend_me_token) {
|
|
|
|
/*
|
|
* rtas_ibm_suspend_me assumes the streamid handle is in cpu
|
|
* endian, or at least the hcall within it requires it.
|
|
*/
|
|
int rc = 0;
|
|
u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
|
|
| be32_to_cpu(args.args[1]);
|
|
rc = rtas_ibm_suspend_me(handle);
|
|
if (rc == -EAGAIN)
|
|
args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
|
|
else if (rc == -EIO)
|
|
args.rets[0] = cpu_to_be32(-1);
|
|
else if (rc)
|
|
return rc;
|
|
goto copy_return;
|
|
}
|
|
|
|
buff_copy = get_errorlog_buffer();
|
|
|
|
flags = lock_rtas();
|
|
|
|
rtas.args = args;
|
|
enter_rtas(__pa(&rtas.args));
|
|
args = rtas.args;
|
|
|
|
/* A -1 return code indicates that the last command couldn't
|
|
be completed due to a hardware error. */
|
|
if (be32_to_cpu(args.rets[0]) == -1)
|
|
errbuf = __fetch_rtas_last_error(buff_copy);
|
|
|
|
unlock_rtas(flags);
|
|
|
|
if (buff_copy) {
|
|
if (errbuf)
|
|
log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
|
|
kfree(buff_copy);
|
|
}
|
|
|
|
copy_return:
|
|
/* Copy out args. */
|
|
if (copy_to_user(uargs->args + nargs,
|
|
args.args + nargs,
|
|
nret * sizeof(rtas_arg_t)) != 0)
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Call early during boot, before mem init, to retrieve the RTAS
|
|
* information from the device-tree and allocate the RMO buffer for userland
|
|
* accesses.
|
|
*/
|
|
void __init rtas_initialize(void)
|
|
{
|
|
unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
|
|
u32 base, size, entry;
|
|
int no_base, no_size, no_entry;
|
|
|
|
/* Get RTAS dev node and fill up our "rtas" structure with infos
|
|
* about it.
|
|
*/
|
|
rtas.dev = of_find_node_by_name(NULL, "rtas");
|
|
if (!rtas.dev)
|
|
return;
|
|
|
|
no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);
|
|
no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);
|
|
if (no_base || no_size) {
|
|
of_node_put(rtas.dev);
|
|
rtas.dev = NULL;
|
|
return;
|
|
}
|
|
|
|
rtas.base = base;
|
|
rtas.size = size;
|
|
no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);
|
|
rtas.entry = no_entry ? rtas.base : entry;
|
|
|
|
/* If RTAS was found, allocate the RMO buffer for it and look for
|
|
* the stop-self token if any
|
|
*/
|
|
#ifdef CONFIG_PPC64
|
|
if (firmware_has_feature(FW_FEATURE_LPAR)) {
|
|
rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
|
|
ibm_suspend_me_token = rtas_token("ibm,suspend-me");
|
|
}
|
|
#endif
|
|
rtas_rmo_buf = memblock_phys_alloc_range(RTAS_RMOBUF_MAX, PAGE_SIZE,
|
|
0, rtas_region);
|
|
if (!rtas_rmo_buf)
|
|
panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",
|
|
PAGE_SIZE, &rtas_region);
|
|
|
|
#ifdef CONFIG_RTAS_ERROR_LOGGING
|
|
rtas_last_error_token = rtas_token("rtas-last-error");
|
|
#endif
|
|
}
|
|
|
|
int __init early_init_dt_scan_rtas(unsigned long node,
|
|
const char *uname, int depth, void *data)
|
|
{
|
|
const u32 *basep, *entryp, *sizep;
|
|
|
|
if (depth != 1 || strcmp(uname, "rtas") != 0)
|
|
return 0;
|
|
|
|
basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
|
|
entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
|
|
sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
|
|
|
|
if (basep && entryp && sizep) {
|
|
rtas.base = *basep;
|
|
rtas.entry = *entryp;
|
|
rtas.size = *sizep;
|
|
}
|
|
|
|
#ifdef CONFIG_UDBG_RTAS_CONSOLE
|
|
basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
|
|
if (basep)
|
|
rtas_putchar_token = *basep;
|
|
|
|
basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
|
|
if (basep)
|
|
rtas_getchar_token = *basep;
|
|
|
|
if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
|
|
rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
|
|
udbg_init_rtas_console();
|
|
|
|
#endif
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
static arch_spinlock_t timebase_lock;
|
|
static u64 timebase = 0;
|
|
|
|
void rtas_give_timebase(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
hard_irq_disable();
|
|
arch_spin_lock(&timebase_lock);
|
|
rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
|
|
timebase = get_tb();
|
|
arch_spin_unlock(&timebase_lock);
|
|
|
|
while (timebase)
|
|
barrier();
|
|
rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void rtas_take_timebase(void)
|
|
{
|
|
while (!timebase)
|
|
barrier();
|
|
arch_spin_lock(&timebase_lock);
|
|
set_tb(timebase >> 32, timebase & 0xffffffff);
|
|
timebase = 0;
|
|
arch_spin_unlock(&timebase_lock);
|
|
}
|