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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[S390] hibernate: Do real CPU swap at resume time
Currently, when the physical resume CPU is not equal to the physical suspend CPU, we swap the CPUs logically, by modifying the logical/physical CPU mapping. This has two major drawbacks: First the change is visible from user space (e.g. CPU sysfs files) and second it is hard to ensure that nowhere in the kernel the physical CPU ID is stored before suspend. To fix this, we now really swap the physical CPUs, if the resume CPU is not the pysical suspend CPU. We restart the suspend CPU and stop the resume CPU using SIGP restart and SIGP stop. If the suspend CPU is no longer available, we write a message and load a disabled wait PSW. Signed-off-by: Michael Holzheu <michael.holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu
Martin Schwidefsky
parent
68d1e5f08b
commit
1aaf179d04
@ -86,6 +86,7 @@
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#define __LC_PGM_OLD_PSW 0x0150
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#define __LC_MCK_OLD_PSW 0x0160
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#define __LC_IO_OLD_PSW 0x0170
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#define __LC_RESTART_PSW 0x01a0
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#define __LC_EXT_NEW_PSW 0x01b0
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#define __LC_SVC_NEW_PSW 0x01c0
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#define __LC_PGM_NEW_PSW 0x01d0
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@ -7,6 +7,7 @@
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#include <linux/sched.h>
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#include <linux/kbuild.h>
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#include <asm/vdso.h>
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#include <asm/sigp.h>
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int main(void)
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{
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@ -59,6 +60,10 @@ int main(void)
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DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
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DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
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DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
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/* constants for SIGP */
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DEFINE(__SIGP_STOP, sigp_stop);
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DEFINE(__SIGP_RESTART, sigp_restart);
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DEFINE(__SIGP_SENSE, sigp_sense);
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DEFINE(__SIGP_INITIAL_CPU_RESET, sigp_initial_cpu_reset);
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return 0;
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}
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@ -24,8 +24,6 @@ LC_EXT_INT_CODE = 0x86 # addr of ext int code
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# R3 = external interruption parameter if R2=0
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#
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.section ".init.text","ax"
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_sclp_wait_int:
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stm %r6,%r15,24(%r15) # save registers
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basr %r13,0 # get base register
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@ -318,9 +316,8 @@ _sclp_print_early:
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.long _sclp_work_area
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.Lascebc:
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.long _ascebc
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.previous
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.section ".init.data","a"
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.section .data,"aw",@progbits
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.balign 4096
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_sclp_work_area:
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.fill 4096
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@ -1041,42 +1041,6 @@ static ssize_t dispatching_store(struct sysdev_class *dev, const char *buf,
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static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show,
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dispatching_store);
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/*
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* If the resume kernel runs on another cpu than the suspended kernel,
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* we have to switch the cpu IDs in the logical map.
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*/
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void smp_switch_boot_cpu_in_resume(u32 resume_phys_cpu_id,
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struct _lowcore *suspend_lowcore)
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{
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int cpu, suspend_cpu_id, resume_cpu_id;
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u32 suspend_phys_cpu_id;
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suspend_phys_cpu_id = __cpu_logical_map[suspend_lowcore->cpu_nr];
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suspend_cpu_id = suspend_lowcore->cpu_nr;
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for_each_present_cpu(cpu) {
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if (__cpu_logical_map[cpu] == resume_phys_cpu_id) {
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resume_cpu_id = cpu;
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goto found;
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}
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}
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panic("Could not find resume cpu in logical map.\n");
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found:
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printk("Resume cpu ID: %i/%i\n", resume_phys_cpu_id, resume_cpu_id);
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printk("Suspend cpu ID: %i/%i\n", suspend_phys_cpu_id, suspend_cpu_id);
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__cpu_logical_map[resume_cpu_id] = suspend_phys_cpu_id;
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__cpu_logical_map[suspend_cpu_id] = resume_phys_cpu_id;
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lowcore_ptr[suspend_cpu_id]->cpu_addr = resume_phys_cpu_id;
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}
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u32 smp_get_phys_cpu_id(void)
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{
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return __cpu_logical_map[smp_processor_id()];
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}
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static int __init topology_init(void)
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{
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int cpu;
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@ -9,6 +9,7 @@
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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/*
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@ -41,6 +42,9 @@ swsusp_arch_suspend:
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/* Get pointer to save area */
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lghi %r1,0x1000
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/* Save CPU address */
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stap __LC_CPU_ADDRESS(%r1)
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/* Store registers */
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mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */
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stfpc 0x31c(%r1) /* store fpu control */
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@ -105,12 +109,7 @@ swsusp_arch_resume:
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/* Make all free pages stable */
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lghi %r2,1
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brasl %r14,arch_set_page_states
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#ifdef CONFIG_SMP
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/* Save boot cpu number */
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brasl %r14,smp_get_phys_cpu_id
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larl %r1,saved_cpu_id
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st %r2,0(%r1)
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#endif
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/* Deactivate DAT */
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stnsm __SF_EMPTY(%r15),0xfb
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@ -139,12 +138,10 @@ swsusp_arch_resume:
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/* Reset System */
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larl %r1,restart_entry
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larl %r2,restart_psw
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larl %r2,.Lrestart_diag308_psw
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og %r1,0(%r2)
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stg %r1,0(%r0)
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larl %r1,saved_pgm_check_psw
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mvc 0(16,%r1),__LC_PGM_NEW_PSW(%r0)
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larl %r1,new_pgm_check_psw
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larl %r1,.Lnew_pgm_check_psw
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epsw %r2,%r3
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stm %r2,%r3,0(%r1)
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mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1)
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@ -154,12 +151,54 @@ restart_entry:
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lhi %r1,1
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sigp %r1,%r0,0x12
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sam64
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larl %r1,new_pgm_check_psw
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larl %r1,.Lnew_pgm_check_psw
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lpswe 0(%r1)
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pgm_check_entry:
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larl %r1,saved_pgm_check_psw
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mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1)
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/* Switch to original suspend CPU */
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larl %r1,.Lresume_cpu /* Resume CPU address: r2 */
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stap 0(%r1)
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llgh %r2,0(%r1)
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lghi %r3,0x1000
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llgh %r1,__LC_CPU_ADDRESS(%r3) /* Suspend CPU address: r1 */
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cgr %r1,%r2
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je restore_registers /* r1 = r2 -> nothing to do */
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larl %r4,.Lrestart_suspend_psw /* Set new restart PSW */
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mvc __LC_RESTART_PSW(16,%r0),0(%r4)
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3:
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sigp %r9,%r1,__SIGP_INITIAL_CPU_RESET
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brc 8,4f /* accepted */
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brc 2,3b /* busy, try again */
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/* Suspend CPU not available -> panic */
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larl %r15,init_thread_union
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ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER)
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larl %r2,.Lpanic_string
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larl %r3,_sclp_print_early
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lghi %r1,0
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sam31
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sigp %r1,%r0,0x12
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basr %r14,%r3
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larl %r3,.Ldisabled_wait_31
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lpsw 0(%r3)
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4:
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/* Switch to suspend CPU */
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sigp %r9,%r1,__SIGP_RESTART /* start suspend CPU */
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brc 2,4b /* busy, try again */
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5:
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sigp %r9,%r2,__SIGP_STOP /* stop resume (current) CPU */
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6: j 6b
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restart_suspend:
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larl %r1,.Lresume_cpu
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llgh %r2,0(%r1)
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7:
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sigp %r9,%r2,__SIGP_SENSE /* Wait for resume CPU */
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brc 2,7b /* busy, try again */
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tmll %r9,0x40 /* Test if resume CPU is stopped */
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jz 7b
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restore_registers:
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/* Restore registers */
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lghi %r13,0x1000 /* %r1 = pointer to save arae */
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@ -193,13 +232,6 @@ pgm_check_entry:
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/* Pointer to save area */
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lghi %r13,0x1000
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#ifdef CONFIG_SMP
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/* Switch CPUs */
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larl %r1,saved_cpu_id
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llgf %r2,0(%r1)
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llgf %r3,0x318(%r13)
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brasl %r14,smp_switch_boot_cpu_in_resume
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#endif
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/* Restore prefix register */
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spx 0x318(%r13)
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@ -217,13 +249,16 @@ pgm_check_entry:
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.section .data.nosave,"aw",@progbits
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.align 8
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restart_psw:
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.Ldisabled_wait_31:
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.long 0x000a0000,0x00000000
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.Lpanic_string:
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.asciz "Resume not possible because suspend CPU is no longer available"
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.align 8
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.Lrestart_diag308_psw:
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.long 0x00080000,0x80000000
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new_pgm_check_psw:
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.Lrestart_suspend_psw:
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.quad 0x0000000180000000,restart_suspend
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.Lnew_pgm_check_psw:
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.quad 0,pgm_check_entry
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saved_pgm_check_psw:
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.quad 0,0
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#ifdef CONFIG_SMP
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saved_cpu_id:
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.long 0
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#endif
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.Lresume_cpu:
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.byte 0,0
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