forked from Minki/linux
s390/dump: cleanup CPU save area handling
Introduce save_area_alloc(), save_area_boot_cpu(), save_area_add_regs() and save_area_add_vxrs to deal with storing the CPU state in case of a system dump. Remove struct save_area and save_area_ext, and create a new struct save_area as a local definition to arch/s390/kernel/crash_dump.c. Copy each individual field from the hardware status area to the save area, storing the minimum of required data. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
parent
1a36a39e22
commit
1a2c5840ac
@ -88,12 +88,11 @@ struct ipl_parameter_block {
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*/
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extern u32 ipl_flags;
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struct dump_save_areas {
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struct save_area_ext **areas;
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int count;
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};
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extern struct dump_save_areas dump_save_areas;
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struct save_area;
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struct save_area * __init save_area_alloc(bool is_boot_cpu);
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struct save_area * __init save_area_boot_cpu(void);
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void __init save_area_add_regs(struct save_area *, void *regs);
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void __init save_area_add_vxrs(struct save_area *, __vector128 *vxrs);
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extern void do_reipl(void);
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extern void do_halt(void);
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@ -16,27 +16,6 @@
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#define LC_ORDER 1
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#define LC_PAGES 2
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struct save_area {
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u64 fp_regs[16];
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u64 gp_regs[16];
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u8 psw[16];
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u8 pad1[8];
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u32 pref_reg;
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u32 fp_ctrl_reg;
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u8 pad2[4];
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u32 tod_reg;
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u64 timer;
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u64 clk_cmp;
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u8 pad3[8];
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u32 acc_regs[16];
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u64 ctrl_regs[16];
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} __packed;
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struct save_area_ext {
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struct save_area sa;
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__vector128 vx_regs[32];
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};
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struct _lowcore {
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__u8 pad_0x0000[0x0014-0x0000]; /* 0x0000 */
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__u32 ipl_parmblock_ptr; /* 0x0014 */
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@ -13,6 +13,7 @@
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#include <linux/slab.h>
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#include <linux/bootmem.h>
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#include <linux/elf.h>
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#include <asm/asm-offsets.h>
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#include <linux/memblock.h>
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#include <asm/os_info.h>
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#include <asm/elf.h>
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@ -32,7 +33,84 @@ static struct memblock_type oldmem_type = {
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.regions = &oldmem_region,
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};
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struct dump_save_areas dump_save_areas;
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struct save_area {
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struct list_head list;
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u64 psw[2];
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u64 ctrs[16];
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u64 gprs[16];
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u32 acrs[16];
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u64 fprs[16];
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u32 fpc;
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u32 prefix;
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u64 todpreg;
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u64 timer;
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u64 todcmp;
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u64 vxrs_low[16];
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__vector128 vxrs_high[16];
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};
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static LIST_HEAD(dump_save_areas);
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/*
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* Allocate a save area
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*/
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struct save_area * __init save_area_alloc(bool is_boot_cpu)
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{
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struct save_area *sa;
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sa = (void *) memblock_alloc(sizeof(*sa), 8);
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if (!sa)
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return NULL;
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if (is_boot_cpu)
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list_add(&sa->list, &dump_save_areas);
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else
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list_add_tail(&sa->list, &dump_save_areas);
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return sa;
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}
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/*
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* Return the address of the save area for the boot CPU
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*/
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struct save_area * __init save_area_boot_cpu(void)
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{
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if (list_empty(&dump_save_areas))
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return NULL;
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return list_first_entry(&dump_save_areas, struct save_area, list);
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}
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/*
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* Copy CPU registers into the save area
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*/
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void __init save_area_add_regs(struct save_area *sa, void *regs)
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{
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struct _lowcore *lc;
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lc = (struct _lowcore *)(regs - __LC_FPREGS_SAVE_AREA);
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memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw));
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memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs));
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memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs));
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memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs));
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memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs));
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memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc));
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memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix));
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memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg));
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memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer));
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memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp));
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}
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/*
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* Copy vector registers into the save area
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*/
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void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs)
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{
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int i;
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/* Copy lower halves of vector registers 0-15 */
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for (i = 0; i < 16; i++)
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memcpy(&sa->vxrs_low[i], &vxrs[i].u[2], 8);
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/* Copy vector registers 16-31 */
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memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
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}
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/*
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* Return physical address for virtual address
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@ -232,8 +310,8 @@ static void *kzalloc_panic(int len)
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/*
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* Initialize ELF note
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*/
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static void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len,
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const char *name)
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static void *nt_init_name(void *buf, Elf64_Word type, void *desc, int d_len,
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const char *name)
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{
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Elf64_Nhdr *note;
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u64 len;
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@ -253,137 +331,42 @@ static void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len,
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return PTR_ADD(buf, len);
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}
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/*
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* Initialize prstatus note
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*/
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static void *nt_prstatus(void *ptr, struct save_area *sa)
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static inline void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len)
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{
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struct elf_prstatus nt_prstatus;
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static int cpu_nr = 1;
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memset(&nt_prstatus, 0, sizeof(nt_prstatus));
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memcpy(&nt_prstatus.pr_reg.gprs, sa->gp_regs, sizeof(sa->gp_regs));
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memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
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memcpy(&nt_prstatus.pr_reg.acrs, sa->acc_regs, sizeof(sa->acc_regs));
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nt_prstatus.pr_pid = cpu_nr;
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cpu_nr++;
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return nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus),
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"CORE");
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}
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/*
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* Initialize fpregset (floating point) note
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*/
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static void *nt_fpregset(void *ptr, struct save_area *sa)
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{
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elf_fpregset_t nt_fpregset;
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memset(&nt_fpregset, 0, sizeof(nt_fpregset));
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memcpy(&nt_fpregset.fpc, &sa->fp_ctrl_reg, sizeof(sa->fp_ctrl_reg));
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memcpy(&nt_fpregset.fprs, &sa->fp_regs, sizeof(sa->fp_regs));
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return nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset),
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"CORE");
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}
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/*
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* Initialize timer note
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*/
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static void *nt_s390_timer(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer),
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KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize TOD clock comparator note
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*/
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static void *nt_s390_tod_cmp(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_TODCMP, &sa->clk_cmp,
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sizeof(sa->clk_cmp), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize TOD programmable register note
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*/
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static void *nt_s390_tod_preg(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_TODPREG, &sa->tod_reg,
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sizeof(sa->tod_reg), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize control register note
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*/
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static void *nt_s390_ctrs(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_CTRS, &sa->ctrl_regs,
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sizeof(sa->ctrl_regs), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize prefix register note
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*/
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static void *nt_s390_prefix(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_PREFIX, &sa->pref_reg,
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sizeof(sa->pref_reg), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize vxrs high note (full 128 bit VX registers 16-31)
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*/
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static void *nt_s390_vx_high(void *ptr, __vector128 *vx_regs)
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{
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return nt_init(ptr, NT_S390_VXRS_HIGH, &vx_regs[16],
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16 * sizeof(__vector128), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize vxrs low note (lower halves of VX registers 0-15)
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*/
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static void *nt_s390_vx_low(void *ptr, __vector128 *vx_regs)
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{
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Elf64_Nhdr *note;
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u64 len;
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int i;
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note = (Elf64_Nhdr *)ptr;
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note->n_namesz = strlen(KEXEC_CORE_NOTE_NAME) + 1;
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note->n_descsz = 16 * 8;
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note->n_type = NT_S390_VXRS_LOW;
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len = sizeof(Elf64_Nhdr);
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memcpy(ptr + len, KEXEC_CORE_NOTE_NAME, note->n_namesz);
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len = roundup(len + note->n_namesz, 4);
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ptr += len;
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/* Copy lower halves of SIMD registers 0-15 */
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for (i = 0; i < 16; i++) {
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memcpy(ptr, &vx_regs[i].u[2], 8);
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ptr += 8;
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}
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return ptr;
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return nt_init_name(buf, type, desc, d_len, KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Fill ELF notes for one CPU with save area registers
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*/
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static void *fill_cpu_elf_notes(void *ptr, struct save_area *sa,
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__vector128 *vx_regs)
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static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa)
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{
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ptr = nt_prstatus(ptr, sa);
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ptr = nt_fpregset(ptr, sa);
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ptr = nt_s390_timer(ptr, sa);
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ptr = nt_s390_tod_cmp(ptr, sa);
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ptr = nt_s390_tod_preg(ptr, sa);
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ptr = nt_s390_ctrs(ptr, sa);
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ptr = nt_s390_prefix(ptr, sa);
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if (MACHINE_HAS_VX && vx_regs) {
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ptr = nt_s390_vx_low(ptr, vx_regs);
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ptr = nt_s390_vx_high(ptr, vx_regs);
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struct elf_prstatus nt_prstatus;
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elf_fpregset_t nt_fpregset;
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/* Prepare prstatus note */
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memset(&nt_prstatus, 0, sizeof(nt_prstatus));
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memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs));
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memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
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memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs));
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nt_prstatus.pr_pid = cpu;
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/* Prepare fpregset (floating point) note */
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memset(&nt_fpregset, 0, sizeof(nt_fpregset));
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memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc));
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memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs));
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/* Create ELF notes for the CPU */
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ptr = nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus));
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ptr = nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset));
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ptr = nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer));
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ptr = nt_init(ptr, NT_S390_TODCMP, &sa->todcmp, sizeof(sa->todcmp));
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ptr = nt_init(ptr, NT_S390_TODPREG, &sa->todpreg, sizeof(sa->todpreg));
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ptr = nt_init(ptr, NT_S390_CTRS, &sa->ctrs, sizeof(sa->ctrs));
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ptr = nt_init(ptr, NT_S390_PREFIX, &sa->prefix, sizeof(sa->prefix));
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if (MACHINE_HAS_VX) {
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ptr = nt_init(ptr, NT_S390_VXRS_HIGH,
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&sa->vxrs_high, sizeof(sa->vxrs_high));
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ptr = nt_init(ptr, NT_S390_VXRS_LOW,
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&sa->vxrs_low, sizeof(sa->vxrs_low));
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}
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return ptr;
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}
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@ -398,8 +381,7 @@ static void *nt_prpsinfo(void *ptr)
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memset(&prpsinfo, 0, sizeof(prpsinfo));
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prpsinfo.pr_sname = 'R';
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strcpy(prpsinfo.pr_fname, "vmlinux");
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return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo),
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KEXEC_CORE_NOTE_NAME);
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return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo));
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}
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/*
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@ -441,7 +423,7 @@ static void *nt_vmcoreinfo(void *ptr)
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vmcoreinfo = get_vmcoreinfo_old(&size);
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if (!vmcoreinfo)
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return ptr;
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return nt_init(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
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return nt_init_name(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
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}
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/*
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@ -470,13 +452,12 @@ static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt)
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*/
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static int get_cpu_cnt(void)
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{
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int i, cpus = 0;
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struct save_area *sa;
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int cpus = 0;
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for (i = 0; i < dump_save_areas.count; i++) {
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if (dump_save_areas.areas[i]->sa.pref_reg == 0)
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continue;
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cpus++;
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}
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list_for_each_entry(sa, &dump_save_areas, list)
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if (sa->prefix != 0)
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cpus++;
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return cpus;
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}
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@ -521,18 +502,16 @@ static void loads_init(Elf64_Phdr *phdr, u64 loads_offset)
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*/
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static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset)
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{
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struct save_area_ext *sa_ext;
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struct save_area *sa;
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void *ptr_start = ptr;
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int i;
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int cpu;
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ptr = nt_prpsinfo(ptr);
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for (i = 0; i < dump_save_areas.count; i++) {
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sa_ext = dump_save_areas.areas[i];
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if (sa_ext->sa.pref_reg == 0)
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continue;
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ptr = fill_cpu_elf_notes(ptr, &sa_ext->sa, sa_ext->vx_regs);
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}
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cpu = 1;
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list_for_each_entry(sa, &dump_save_areas, list)
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if (sa->prefix != 0)
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ptr = fill_cpu_elf_notes(ptr, cpu++, sa);
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ptr = nt_vmcoreinfo(ptr);
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memset(phdr, 0, sizeof(*phdr));
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phdr->p_type = PT_NOTE;
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@ -585,7 +585,7 @@ int smp_store_status(int cpu)
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* This case does not exist for s390 anymore, setup_arch explicitly
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* deactivates the elfcorehdr= kernel parameter
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*/
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static __init void smp_save_cpu_vxrs(struct save_area_ext *sa_ext, u16 addr,
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static __init void smp_save_cpu_vxrs(struct save_area *sa, u16 addr,
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bool is_boot_cpu, unsigned long page)
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{
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__vector128 *vxrs = (__vector128 *) page;
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@ -594,10 +594,10 @@ static __init void smp_save_cpu_vxrs(struct save_area_ext *sa_ext, u16 addr,
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vxrs = boot_cpu_vector_save_area;
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else
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__pcpu_sigp_relax(addr, SIGP_STORE_ADDITIONAL_STATUS, page);
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memcpy(&sa_ext->vx_regs, vxrs, sizeof(sa_ext->vx_regs));
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save_area_add_vxrs(sa, vxrs);
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}
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static __init void smp_save_cpu_regs(struct save_area_ext *sa_ext, u16 addr,
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static __init void smp_save_cpu_regs(struct save_area *sa, u16 addr,
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bool is_boot_cpu, unsigned long page)
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{
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void *regs = (void *) page;
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@ -606,13 +606,13 @@ static __init void smp_save_cpu_regs(struct save_area_ext *sa_ext, u16 addr,
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copy_oldmem_kernel(regs, (void *) __LC_FPREGS_SAVE_AREA, 512);
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else
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__pcpu_sigp_relax(addr, SIGP_STORE_STATUS_AT_ADDRESS, page);
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memcpy(&sa_ext->sa, regs, sizeof(sa_ext->sa));
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save_area_add_regs(sa, regs);
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}
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void __init smp_save_dump_cpus(void)
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{
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int addr, cpu, boot_cpu_addr, max_cpu_addr;
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struct save_area_ext *sa_ext;
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int addr, boot_cpu_addr, max_cpu_addr;
|
||||
struct save_area *sa;
|
||||
unsigned long page;
|
||||
bool is_boot_cpu;
|
||||
|
||||
@ -625,29 +625,20 @@ void __init smp_save_dump_cpus(void)
|
||||
panic("could not allocate memory for save area\n");
|
||||
/* Set multi-threading state to the previous system. */
|
||||
pcpu_set_smt(sclp.mtid_prev);
|
||||
max_cpu_addr = SCLP_MAX_CORES << sclp.mtid_prev;
|
||||
for (cpu = 0, addr = 0; addr <= max_cpu_addr; addr++) {
|
||||
if (__pcpu_sigp_relax(addr, SIGP_SENSE, 0) ==
|
||||
SIGP_CC_NOT_OPERATIONAL)
|
||||
continue;
|
||||
cpu += 1;
|
||||
}
|
||||
dump_save_areas.areas = (void *)memblock_alloc(sizeof(void *) * cpu, 8);
|
||||
dump_save_areas.count = cpu;
|
||||
boot_cpu_addr = stap();
|
||||
for (cpu = 0, addr = 0; addr <= max_cpu_addr; addr++) {
|
||||
max_cpu_addr = SCLP_MAX_CORES << sclp.mtid_prev;
|
||||
for (addr = 0; addr <= max_cpu_addr; addr++) {
|
||||
if (__pcpu_sigp_relax(addr, SIGP_SENSE, 0) ==
|
||||
SIGP_CC_NOT_OPERATIONAL)
|
||||
continue;
|
||||
sa_ext = (void *) memblock_alloc(sizeof(*sa_ext), 8);
|
||||
dump_save_areas.areas[cpu] = sa_ext;
|
||||
if (!sa_ext)
|
||||
panic("could not allocate memory for save area\n");
|
||||
is_boot_cpu = (addr == boot_cpu_addr);
|
||||
cpu += 1;
|
||||
/* Allocate save area */
|
||||
sa = save_area_alloc(is_boot_cpu);
|
||||
if (!sa)
|
||||
panic("could not allocate memory for save area\n");
|
||||
if (MACHINE_HAS_VX)
|
||||
/* Get the vector registers */
|
||||
smp_save_cpu_vxrs(sa_ext, addr, is_boot_cpu, page);
|
||||
smp_save_cpu_vxrs(sa, addr, is_boot_cpu, page);
|
||||
/*
|
||||
* For a zfcp dump OLDMEM_BASE == NULL and the registers
|
||||
* of the boot CPU are stored in the HSA. To retrieve
|
||||
@ -656,7 +647,7 @@ void __init smp_save_dump_cpus(void)
|
||||
*/
|
||||
if (!is_boot_cpu || OLDMEM_BASE)
|
||||
/* Get the CPU registers */
|
||||
smp_save_cpu_regs(sa_ext, addr, is_boot_cpu, page);
|
||||
smp_save_cpu_regs(sa, addr, is_boot_cpu, page);
|
||||
}
|
||||
memblock_free(page, PAGE_SIZE);
|
||||
diag308_reset();
|
||||
|
||||
@ -117,18 +117,17 @@ int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
|
||||
|
||||
static int __init init_cpu_info(void)
|
||||
{
|
||||
struct save_area_ext *sa_ext;
|
||||
struct save_area *sa;
|
||||
|
||||
/* get info for boot cpu from lowcore, stored in the HSA */
|
||||
|
||||
sa_ext = dump_save_areas.areas[0];
|
||||
if (!sa_ext)
|
||||
sa = save_area_boot_cpu();
|
||||
if (!sa)
|
||||
return -ENOMEM;
|
||||
if (memcpy_hsa_kernel(&sa_ext->sa, __LC_FPREGS_SAVE_AREA,
|
||||
sizeof(struct save_area)) < 0) {
|
||||
if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) {
|
||||
TRACE("could not copy from HSA\n");
|
||||
return -EIO;
|
||||
}
|
||||
save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user