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charset="utf-8" Kernel expects the platform to provide CPU registers after pausing execution of the CPUs. Currently only exporting the registers, used by Linux, for generating the /proc/vmcore Reviewed-by: Hari Bathini Signed-off-by: Aditya Gupta --- hw/ppc/pnv_mpipl.c | 154 +++++++++++++++++++++++++++++++++++++ include/hw/ppc/pnv_mpipl.h | 60 +++++++++++++++ 2 files changed, 214 insertions(+) diff --git a/hw/ppc/pnv_mpipl.c b/hw/ppc/pnv_mpipl.c index d9fe4a5decac..37f498051254 100644 --- a/hw/ppc/pnv_mpipl.c +++ b/hw/ppc/pnv_mpipl.c @@ -8,6 +8,9 @@ #include "qemu/log.h" #include "qemu/units.h" #include "system/address-spaces.h" +#include "system/cpus.h" +#include "system/hw_accel.h" +#include "system/memory.h" #include "system/runstate.h" #include "hw/ppc/pnv.h" #include "hw/ppc/pnv_mpipl.h" @@ -17,6 +20,8 @@ (pnv->mpipl_state.skiboot_base + MDST_TABLE_OFF) #define MDDT_TABLE_RELOCATED \ (pnv->mpipl_state.skiboot_base + MDDT_TABLE_OFF) +#define PROC_DUMP_RELOCATED \ + (pnv->mpipl_state.skiboot_base + PROC_DUMP_AREA_OFF) =20 /* * Preserve the memory regions as pointed by MDST table @@ -168,9 +173,158 @@ static bool pnv_mpipl_preserve_mem(PnvMachineState *p= nv) return true; } =20 +static void do_store_cpu_regs(CPUState *cpu, MpiplPreservedCPUState *state) +{ + CPUPPCState *env =3D cpu_env(cpu); + MpiplRegDataHdr *regs_hdr =3D &state->hdr; + MpiplRegEntry *reg_entries =3D state->reg_entries; + MpiplRegEntry *curr_reg_entry; + uint32_t num_saved_regs =3D 0; + + cpu_synchronize_state(cpu); + + regs_hdr->pir =3D cpu_to_be32(env->spr[SPR_PIR]); + + /* QEMU CPUs are not in Power Saving Mode */ + regs_hdr->core_state =3D 0xff; + + regs_hdr->off_regentries =3D 0; + regs_hdr->num_regentries =3D cpu_to_be32(NUM_REGS_PER_CPU); + + regs_hdr->alloc_size =3D cpu_to_be32(sizeof(MpiplRegEntry)); + regs_hdr->act_size =3D cpu_to_be32(sizeof(MpiplRegEntry)); + +#define REG_TYPE_GPR 0x1 +#define REG_TYPE_SPR 0x2 +#define REG_TYPE_TIMA 0x3 + +/* + * ID numbers used by f/w while populating certain registers + * + * Copied these defines from the linux kernel + */ +#define REG_ID_NIP 0x7D0 +#define REG_ID_MSR 0x7D1 +#define REG_ID_CCR 0x7D2 + + curr_reg_entry =3D reg_entries; + +#define REG_ENTRY(type, num, val) \ + do { \ + curr_reg_entry->reg_type =3D cpu_to_be32(type); \ + curr_reg_entry->reg_num =3D cpu_to_be32(num); \ + curr_reg_entry->reg_val =3D cpu_to_be64(val); \ + ++curr_reg_entry; \ + ++num_saved_regs; \ + } while (0) + + /* Save the GPRs */ + for (int gpr_id =3D 0; gpr_id < 32; ++gpr_id) { + REG_ENTRY(REG_TYPE_GPR, gpr_id, env->gpr[gpr_id]); + } + + REG_ENTRY(REG_TYPE_SPR, SPR_ACOP, env->spr[SPR_ACOP]); + REG_ENTRY(REG_TYPE_SPR, SPR_AMR, env->spr[SPR_AMR]); + REG_ENTRY(REG_TYPE_SPR, SPR_BESCR, env->spr[SPR_BESCR]); + REG_ENTRY(REG_TYPE_SPR, SPR_CFAR, env->spr[SPR_CFAR]); + REG_ENTRY(REG_TYPE_SPR, SPR_CIABR, env->spr[SPR_CIABR]); + + REG_ENTRY(REG_TYPE_SPR, SPR_CTR, env->spr[SPR_CTR]); + REG_ENTRY(REG_TYPE_SPR, SPR_CTRL, env->spr[SPR_CTRL]); + REG_ENTRY(REG_TYPE_SPR, SPR_DABR, env->spr[SPR_DABR]); + REG_ENTRY(REG_TYPE_SPR, SPR_DABRX, env->spr[SPR_DABRX]); + REG_ENTRY(REG_TYPE_SPR, SPR_DAR, env->spr[SPR_DAR]); + REG_ENTRY(REG_TYPE_SPR, SPR_DAWR0, env->spr[SPR_DAWR0]); + REG_ENTRY(REG_TYPE_SPR, SPR_DAWR1, env->spr[SPR_DAWR1]); + REG_ENTRY(REG_TYPE_SPR, SPR_DAWRX0, env->spr[SPR_DAWRX0]); + REG_ENTRY(REG_TYPE_SPR, SPR_DAWRX1, env->spr[SPR_DAWRX1]); + REG_ENTRY(REG_TYPE_SPR, SPR_DPDES, env->spr[SPR_DPDES]); + REG_ENTRY(REG_TYPE_SPR, SPR_DSCR, env->spr[SPR_DSCR]); + REG_ENTRY(REG_TYPE_SPR, SPR_DSISR, env->spr[SPR_DSISR]); + REG_ENTRY(REG_TYPE_SPR, SPR_EBBHR, env->spr[SPR_EBBHR]); + REG_ENTRY(REG_TYPE_SPR, SPR_EBBRR, env->spr[SPR_EBBRR]); + + REG_ENTRY(REG_TYPE_SPR, SPR_FSCR, env->spr[SPR_FSCR]); + + REG_ENTRY(REG_TYPE_SPR, SPR_CTR, env->ctr); + REG_ENTRY(REG_TYPE_SPR, SPR_DAR, env->spr[SPR_DAR]); + REG_ENTRY(REG_TYPE_SPR, SPR_DSISR, env->spr[SPR_DSISR]); + REG_ENTRY(REG_TYPE_SPR, SPR_LR, env->lr); + REG_ENTRY(REG_TYPE_SPR, REG_ID_MSR, env->msr); + REG_ENTRY(REG_TYPE_SPR, REG_ID_NIP, env->nip); + REG_ENTRY(REG_TYPE_SPR, SPR_XER, env->xer); + REG_ENTRY(REG_TYPE_SPR, SPR_SRR0, env->spr[SPR_SRR0]); + REG_ENTRY(REG_TYPE_SPR, SPR_SRR1, env->spr[SPR_SRR1]); + REG_ENTRY(REG_TYPE_SPR, SPR_HSRR0, env->spr[SPR_HSRR0]); + REG_ENTRY(REG_TYPE_SPR, SPR_HSRR1, env->spr[SPR_HSRR1]); + REG_ENTRY(REG_TYPE_SPR, SPR_CFAR, env->spr[SPR_CFAR]); + REG_ENTRY(REG_TYPE_SPR, SPR_HMER, env->spr[SPR_HMER]); + REG_ENTRY(REG_TYPE_SPR, SPR_HMEER, env->spr[SPR_HMEER]); + + /* + * Ensure the number of registers saved match the number of + * registers per cpu + * + * This will help catch an error if in future a new register entry + * is added/removed while not modifying NUM_PER_CPU_REGS + */ + assert(num_saved_regs =3D=3D NUM_REGS_PER_CPU); +} + +static bool pnv_mpipl_preserve_cpu_state(PnvMachineState *pnv) +{ + MachineState *machine =3D MACHINE(pnv); + uint32_t num_cpus =3D machine->smp.cpus; + MpiplPreservedCPUState *state; + CPUState *cpu; + AddressSpace *default_as =3D &address_space_memory; + MemTxResult io_result; + MemTxAttrs attrs; + + /* Mark the memory transactions as privileged memory access */ + attrs.user =3D 0; + attrs.memory =3D 1; + + if (pnv->mpipl_state.cpu_states) { + /* + * CPU States might have been allocated from some past crash, free= the + * memory to preven memory leak + */ + g_free(pnv->mpipl_state.cpu_states); + pnv->mpipl_state.num_cpu_states =3D 0; + } + + pnv->mpipl_state.cpu_states =3D g_malloc_n(num_cpus, + sizeof(MpiplPreservedCPUState)); + pnv->mpipl_state.num_cpu_states =3D num_cpus; + + state =3D pnv->mpipl_state.cpu_states; + + /* Preserve the Processor Dump Area */ + io_result =3D address_space_read(default_as, PROC_DUMP_RELOCATED, attr= s, + &pnv->mpipl_state.proc_area, sizeof(MpiplProcDumpArea)); + if (io_result !=3D MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, + "MPIPL: Failed to read Proc Dump Area at: 0x" TARGET_FMT_lx "\= n", + PROC_DUMP_RELOCATED); + + return false; + } + + CPU_FOREACH(cpu) { + do_store_cpu_regs(cpu, state); + ++state; + } + + return true; +} + void do_mpipl_preserve(PnvMachineState *pnv) { + pause_all_vcpus(); + pnv_mpipl_preserve_mem(pnv); + pnv_mpipl_preserve_cpu_state(pnv); =20 /* Mark next boot as Memory-preserving boot */ pnv->mpipl_state.is_next_boot_mpipl =3D true; diff --git a/include/hw/ppc/pnv_mpipl.h b/include/hw/ppc/pnv_mpipl.h index e0518ef2e12e..a602d6bef48d 100644 --- a/include/hw/ppc/pnv_mpipl.h +++ b/include/hw/ppc/pnv_mpipl.h @@ -15,6 +15,10 @@ typedef struct MdstTableEntry MdstTableEntry; typedef struct MdrtTableEntry MdrtTableEntry; typedef struct MpiplPreservedState MpiplPreservedState; +typedef struct MpiplRegDataHdr MpiplRegDataHdr; +typedef struct MpiplRegEntry MpiplRegEntry; +typedef struct MpiplProcDumpArea MpiplProcDumpArea; +typedef struct MpiplPreservedCPUState MpiplPreservedCPUState; =20 /* * Following offsets are copied from skiboot source code. @@ -49,6 +53,8 @@ typedef struct MpiplPreservedState MpiplPreservedState; =20 #define __packed __attribute__((packed)) =20 +#define NUM_REGS_PER_CPU 66 /*(32 GPRs, 34 SPRs)*/ + /* * Memory Dump Source Table (MDST) * @@ -95,6 +101,55 @@ static_assert(MDST_MAX_ENTRIES =3D=3D MDDT_MAX_ENTRIES, static_assert(MDRT_MAX_ENTRIES >=3D MDST_MAX_ENTRIES, "MDRT should support atleast having number of entries as in MDST"); =20 +/* + * Processor Dump Area + * + * This contains the information needed for having processor + * state captured during a platform dump. + * + * As mentioned in HDAT, following the P9 specific format + */ +struct MpiplProcDumpArea { + uint32_t thread_size; /* Size of each thread register entry */ +#define PROC_DUMP_AREA_VERSION_P9 0x1 /* P9 format */ + uint8_t version; + uint8_t reserved[11]; + uint64_t alloc_addr; /* Destination memory to place register data = */ + uint32_t reserved2; + uint32_t alloc_size; /* Allocated size */ + uint64_t dest_addr; /* Destination address */ + uint32_t reserved3; + uint32_t act_size; /* Actual data size */ +} __packed; + +/* + * "Architected Register Data" in the HDAT spec + * + * Acts as a header to the register entries for a particular thread + */ +struct MpiplRegDataHdr { + uint32_t pir; /* PIR of thread */ + uint8_t core_state; /* Stop state of the overall core */ + uint8_t reserved[3]; + uint32_t off_regentries; /* Offset to Register Entries Array */ + uint32_t num_regentries; /* Number of Register Entries in Array */ + uint32_t alloc_size; /* Allocated size for each Register Entry */ + uint32_t act_size; /* Actual size for each Register Entry */ +} __packed; + +struct MpiplRegEntry { + uint32_t reg_type; + uint32_t reg_num; + uint64_t reg_val; +} __packed; + +struct MpiplPreservedCPUState { + MpiplRegDataHdr hdr; + + /* Length of 'reg_entries' is hdr.num_regentries */ + MpiplRegEntry reg_entries[NUM_REGS_PER_CPU]; +}; + /* Preserved state to be saved in PnvMachineState */ struct MpiplPreservedState { /* skiboot_base will be valid only after OPAL sends relocated base to = SBE */ @@ -103,6 +158,11 @@ struct MpiplPreservedState { =20 MdrtTableEntry *mdrt_table; uint32_t num_mdrt_entries; + + MpiplProcDumpArea proc_area; + + MpiplPreservedCPUState *cpu_states; + uint32_t num_cpu_states; }; =20 #endif --=20 2.53.0