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[193.116.208.39]) by smtp.gmail.com with ESMTPSA id q23-20020a62ae17000000b006e5c464c0a9sm9121283pff.23.2024.03.19.01.00.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Mar 2024 01:00:58 -0700 (PDT) From: Nicholas Piggin To: Thomas Huth Cc: Nicholas Piggin , Laurent Vivier , Andrew Jones , Paolo Bonzini , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org Subject: [kvm-unit-tests PATCH v7 22/35] powerpc: add SMP and IPI support Date: Tue, 19 Mar 2024 17:59:13 +1000 Message-ID: <20240319075926.2422707-23-npiggin@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240319075926.2422707-1-npiggin@gmail.com> References: <20240319075926.2422707-1-npiggin@gmail.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 powerpc SMP support is very primitive and does not set up a first-class runtime environment for secondary CPUs. This reworks SMP support, and provides a complete C and harness environment for the secondaries, including interrupt handling, as well as IPI support. Signed-off-by: Nicholas Piggin --- lib/powerpc/asm/processor.h | 23 +++ lib/powerpc/asm/reg.h | 1 + lib/powerpc/asm/setup.h | 2 - lib/powerpc/asm/smp.h | 46 +++-- lib/powerpc/io.c | 15 +- lib/powerpc/processor.c | 7 +- lib/powerpc/setup.c | 90 +++++++--- lib/powerpc/smp.c | 282 +++++++++++++++++++++++++---- lib/ppc64/asm-offsets.c | 7 + lib/ppc64/asm/atomic.h | 6 + lib/ppc64/asm/barrier.h | 3 + lib/ppc64/asm/opal.h | 7 + powerpc/Makefile.common | 1 + powerpc/cstart64.S | 49 ++++- powerpc/selftest.c | 4 +- powerpc/smp.c | 348 ++++++++++++++++++++++++++++++++++++ powerpc/tm.c | 4 +- powerpc/unittests.cfg | 8 + 18 files changed, 818 insertions(+), 85 deletions(-) create mode 100644 lib/ppc64/asm/atomic.h create mode 100644 powerpc/smp.c diff --git a/lib/powerpc/asm/processor.h b/lib/powerpc/asm/processor.h index eed37d1f4..a3859b5d4 100644 --- a/lib/powerpc/asm/processor.h +++ b/lib/powerpc/asm/processor.h @@ -16,6 +16,7 @@ extern bool cpu_has_siar; extern bool cpu_has_heai; extern bool cpu_has_prefix; extern bool cpu_has_sc_lev; +extern bool cpu_has_pause_short; static inline uint64_t mfspr(int nr) { @@ -45,6 +46,28 @@ static inline void mtmsr(uint64_t msr) asm volatile ("mtmsrd %[msr]" :: [msr] "r" (msr) : "memory"); } +static inline void local_irq_enable(void) +{ + unsigned long msr; + + asm volatile( +" mfmsr %0 \n \ + ori %0,%0,%1 \n \ + mtmsrd %0,1 " + : "=r"(msr) : "i"(MSR_EE): "memory"); +} + +static inline void local_irq_disable(void) +{ + unsigned long msr; + + asm volatile( +" mfmsr %0 \n \ + andc %0,%0,%1 \n \ + mtmsrd %0,1 " + : "=r"(msr) : "r"(MSR_EE): "memory"); +} + /* * This returns true on PowerNV / OPAL machines which run in hypervisor * mode. False on pseries / PAPR machines that run in guest mode. diff --git a/lib/powerpc/asm/reg.h b/lib/powerpc/asm/reg.h index d6097f48f..d2ca964c4 100644 --- a/lib/powerpc/asm/reg.h +++ b/lib/powerpc/asm/reg.h @@ -19,6 +19,7 @@ #define SPR_SPRG1 0x111 #define SPR_SPRG2 0x112 #define SPR_SPRG3 0x113 +#define SPR_TBU40 0x11e #define SPR_PVR 0x11f #define PVR_VERSION_MASK UL(0xffff0000) #define PVR_VER_970 UL(0x00390000) diff --git a/lib/powerpc/asm/setup.h b/lib/powerpc/asm/setup.h index cc7cf5e25..9ca318ce6 100644 --- a/lib/powerpc/asm/setup.h +++ b/lib/powerpc/asm/setup.h @@ -8,8 +8,6 @@ #include #define NR_CPUS 8 /* arbitrarily set for now */ -extern u32 cpus[NR_CPUS]; -extern int nr_cpus; extern uint64_t tb_hz; diff --git a/lib/powerpc/asm/smp.h b/lib/powerpc/asm/smp.h index 21940b4bc..4519e5436 100644 --- a/lib/powerpc/asm/smp.h +++ b/lib/powerpc/asm/smp.h @@ -2,21 +2,45 @@ #define _ASMPOWERPC_SMP_H_ #include +#include -extern int nr_threads; +typedef void (*secondary_entry_fn)(int cpu_id); -struct start_threads { - int nr_threads; - int nr_started; -}; +struct cpu { + unsigned long server_no; + unsigned long stack; + unsigned long exception_stack; + secondary_entry_fn entry; +} __attribute__((packed)); /* used by asm */ -typedef void (*secondary_entry_fn)(void); +extern int nr_cpus_present; +extern int nr_cpus_online; +extern struct cpu cpus[]; -extern void halt(void); +register struct cpu *__current_cpu asm("r13"); +static inline struct cpu *current_cpu(void) +{ + return __current_cpu; +} -extern int start_thread(int cpu_id, secondary_entry_fn entry, uint32_t r3); -extern struct start_threads start_cpu(int cpu_node, secondary_entry_fn entry, - uint32_t r3); -extern bool start_all_cpus(secondary_entry_fn entry, uint32_t r3); +static inline int smp_processor_id(void) +{ + return current_cpu()->server_no; +} + +void cpu_init(struct cpu *cpu, int cpu_id); + +extern void halt(int cpu_id); + +extern bool start_all_cpus(secondary_entry_fn entry); +extern void stop_all_cpus(void); + +struct pt_regs; +void register_ipi(void (*fn)(struct pt_regs *, void *), void *data); +void unregister_ipi(void); +void cpu_init_ipis(void); +void local_ipi_enable(void); +void local_ipi_disable(void); +void send_ipi(int cpu_id); #endif /* _ASMPOWERPC_SMP_H_ */ diff --git a/lib/powerpc/io.c b/lib/powerpc/io.c index ab7bb843c..cb7f2f050 100644 --- a/lib/powerpc/io.c +++ b/lib/powerpc/io.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "io.h" static struct spinlock print_lock; @@ -55,13 +56,17 @@ extern void halt(int code); void exit(int code) { + static int exited = 0; + // FIXME: change this print-exit/rtas-poweroff to chr_testdev_exit(), // maybe by plugging chr-testdev into a spapr-vty. - printf("\nEXIT: STATUS=%d\n", ((code) << 1) | 1); - if (machine_is_powernv()) - opal_power_off(); - else - rtas_power_off(); + if (atomic_fetch_inc(&exited) == 0) { + printf("\nEXIT: STATUS=%d\n", ((code) << 1) | 1); + if (machine_is_powernv()) + opal_power_off(); + else + rtas_power_off(); + } halt(code); __builtin_unreachable(); } diff --git a/lib/powerpc/processor.c b/lib/powerpc/processor.c index 1b4bb0d61..a6ce3c905 100644 --- a/lib/powerpc/processor.c +++ b/lib/powerpc/processor.c @@ -13,6 +13,7 @@ #include #include #include +#include static struct { void (*func)(struct pt_regs *, void *data); @@ -44,6 +45,8 @@ void do_handle_exception(struct pt_regs *regs) { unsigned char v; + __current_cpu = (struct cpu *)mfspr(SPR_SPRG0); + v = regs->trap >> 5; if (v < 128 && handlers[v].func) { @@ -51,8 +54,8 @@ void do_handle_exception(struct pt_regs *regs) return; } - printf("Unhandled cpu exception %#lx at NIA:0x%016lx MSR:0x%016lx\n", - regs->trap, regs->nip, regs->msr); + printf("Unhandled CPU%d exception %#lx at NIA:0x%016lx MSR:0x%016lx\n", + smp_processor_id(), regs->trap, regs->nip, regs->msr); dump_frame_stack((void *)regs->nip, (void *)regs->gpr[1]); abort(); } diff --git a/lib/powerpc/setup.c b/lib/powerpc/setup.c index 496af40f8..16f009152 100644 --- a/lib/powerpc/setup.c +++ b/lib/powerpc/setup.c @@ -2,7 +2,7 @@ * Initialize machine setup information and I/O. * * After running setup() unit tests may query how many cpus they have - * (nr_cpus), how much memory they have (PHYSICAL_END - PHYSICAL_START), + * (nr_cpus_present), how much memory they have (PHYSICAL_END - PHYSICAL_START), * may use dynamic memory allocation (malloc, etc.), printf, and exit. * Finally, argc and argv are also ready to be passed to main(). * @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -28,8 +29,8 @@ extern unsigned long stacktop; char *initrd; u32 initrd_size; -u32 cpus[NR_CPUS] = { [0 ... NR_CPUS-1] = (~0U) }; -int nr_cpus; +u32 cpu_to_hwid[NR_CPUS] = { [0 ... NR_CPUS-1] = (~0U) }; +int nr_cpus_present; uint64_t tb_hz; struct mem_region mem_regions[NR_MEM_REGIONS]; @@ -44,13 +45,32 @@ struct cpu_set_params { static void cpu_set(int fdtnode, u64 regval, void *info) { + const struct fdt_property *prop; + u32 *threads; static bool read_common_info = false; struct cpu_set_params *params = info; - int cpu = nr_cpus++; - - assert_msg(cpu < NR_CPUS, "Number cpus exceeds maximum supported (%d).", NR_CPUS); - - cpus[cpu] = regval; + int nr_threads; + int len, i; + + /* Get the id array of threads on this node */ + prop = fdt_get_property(dt_fdt(), fdtnode, + "ibm,ppc-interrupt-server#s", &len); + assert(prop); + + nr_threads = len >> 2; /* Divide by 4 since 4 bytes per thread */ + threads = (u32 *)prop->data; /* Array of valid ids */ + + for (i = 0; i < nr_threads; i++) { + if (nr_cpus_present >= NR_CPUS) { + static bool warned = false; + if (!warned) { + printf("Warning: Number of present CPUs exceeds maximum supported (%d).\n", NR_CPUS); + warned = true; + } + break; + } + cpu_to_hwid[nr_cpus_present++] = fdt32_to_cpu(threads[i]); + } if (!read_common_info) { const struct fdt_property *prop; @@ -84,32 +104,25 @@ bool cpu_has_siar; bool cpu_has_heai; bool cpu_has_prefix; bool cpu_has_sc_lev; /* sc interrupt has LEV field in SRR1 */ +bool cpu_has_pause_short; -static void cpu_init(void) +static void cpu_init_params(void) { struct cpu_set_params params; int ret; - nr_cpus = 0; + nr_cpus_present = 0; ret = dt_for_each_cpu_node(cpu_set, ¶ms); assert(ret == 0); __icache_bytes = params.icache_bytes; __dcache_bytes = params.dcache_bytes; tb_hz = params.tb_hz; - /* Interrupt Endianness */ - if (machine_is_pseries()) { -#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ - hcall(H_SET_MODE, 1, 4, 0, 0); -#else - hcall(H_SET_MODE, 0, 4, 0, 0); -#endif - } - switch (mfspr(SPR_PVR) & PVR_VERSION_MASK) { case PVR_VER_POWER10: cpu_has_prefix = true; cpu_has_sc_lev = true; + cpu_has_pause_short = true; case PVR_VER_POWER9: case PVR_VER_POWER8E: case PVR_VER_POWER8NVL: @@ -175,19 +188,37 @@ static void mem_init(phys_addr_t freemem_start) #define EXCEPTION_STACK_SIZE SZ_64K static char boot_exception_stack[EXCEPTION_STACK_SIZE]; +struct cpu cpus[NR_CPUS]; + +void cpu_init(struct cpu *cpu, int cpu_id) +{ + cpu->server_no = cpu_id; + + cpu->stack = (unsigned long)memalign(SZ_4K, SZ_64K); + cpu->stack += SZ_64K - 64; + cpu->exception_stack = (unsigned long)memalign(SZ_4K, SZ_64K); + cpu->exception_stack += SZ_64K - 64; +} void setup(const void *fdt) { void *freemem = &stacktop; const char *bootargs, *tmp; + struct cpu *cpu; u32 fdt_size; int ret; cpu_has_hv = !!(mfmsr() & (1ULL << MSR_HV_BIT)); - /* set exception stack address for this CPU (in SPGR0) */ - asm volatile ("mtsprg0 %[addr]" :: - [addr] "r" (boot_exception_stack)); + memset(cpus, 0xff, sizeof(cpus)); + + cpu = &cpus[0]; + cpu->server_no = fdt_boot_cpuid_phys(fdt); + cpu->exception_stack = (unsigned long)boot_exception_stack; + cpu->exception_stack += SZ_64K - 64; + + mtspr(SPR_SPRG0, (unsigned long)cpu); + __current_cpu = cpu; enable_mcheck(); @@ -230,8 +261,19 @@ void setup(const void *fdt) assert(STACK_INT_FRAME_SIZE % 16 == 0); - /* call init functions */ - cpu_init(); + /* set parameters from dt */ + cpu_init_params(); + + /* Interrupt Endianness */ + if (machine_is_pseries()) { +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ + hcall(H_SET_MODE, 1, 4, 0, 0); +#else + hcall(H_SET_MODE, 0, 4, 0, 0); +#endif + } + + cpu_init_ipis(); /* cpu_init must be called before mem_init */ mem_init(PAGE_ALIGN((unsigned long)freemem)); diff --git a/lib/powerpc/smp.c b/lib/powerpc/smp.c index 3e211eba8..a3bf85d44 100644 --- a/lib/powerpc/smp.c +++ b/lib/powerpc/smp.c @@ -6,58 +6,253 @@ * This work is licensed under the terms of the GNU LGPL, version 2. */ +#include #include +#include +#include +#include #include #include +#include +#include #include #include -int nr_threads; - struct secondary_entry_data { secondary_entry_fn entry; - uint64_t r3; - int nr_started; }; +int nr_cpus_online = 1; + +static void stop_self(int cpu_id) +{ + if (machine_is_powernv()) { + if (opal_call(OPAL_RETURN_CPU, 0, 0, 0) != OPAL_SUCCESS) { + printf("OPAL_RETURN_CPU failed\n"); + } + } else { + rtas_stop_self(); + } + + printf("failed to stop cpu %d\n", cpu_id); + assert(0); +} + +void main_secondary(struct cpu *cpu); +void main_secondary(struct cpu *cpu) +{ + mtspr(SPR_SPRG0, (unsigned long)cpu); + __current_cpu = cpu; + + enable_mcheck(); + + cpu_init_ipis(); + + atomic_fetch_inc(&nr_cpus_online); + + cpu->entry(cpu->server_no); + + mb(); + atomic_fetch_dec(&nr_cpus_online); + + stop_self(cpu->server_no); +} + +enum OpalThreadStatus { + OPAL_THREAD_INACTIVE = 0x0, + OPAL_THREAD_STARTED = 0x1, + OPAL_THREAD_UNAVAILABLE = 0x2 /* opal-v3 */ +}; + +#define H_EOI 0x64 +#define H_CPPR 0x68 +#define H_IPI 0x6c +#define H_XIRR 0x74 + +static void (*ipi_fn)(struct pt_regs *regs, void *data); + +static void dbell_handler(struct pt_regs *regs, void *data) +{ + /* sync */ + ipi_fn(regs, data); +} + +static void extint_handler(struct pt_regs *regs, void *data) +{ + int32_t xirr; + int32_t xisr; + int64_t rc; + + asm volatile("mr r3,%1 ; sc 1 ; mr %0,r4" : "=r"(xirr) : "r"(H_XIRR)); + xisr = xirr & 0xffffff; + + if (xisr == 2) { /* IPI */ + rc = hcall(H_IPI, smp_processor_id(), 0xff); + assert(rc == H_SUCCESS); + } + + xirr |= (5 << 24); + rc = hcall(H_EOI, xirr); + assert(rc == H_SUCCESS); + + /* lower IPI */ + ipi_fn(regs, data); +} + +void cpu_init_ipis(void) +{ + if (machine_is_powernv()) { + /* skiboot can leave some messages set */ + unsigned long rb = (5 << (63-36)); + asm volatile("msgclr %0" :: "r"(rb) : "memory"); + } +} + +void local_ipi_enable(void) +{ + if (machine_is_pseries()) { + hcall(H_CPPR, 5); + } +} + +void local_ipi_disable(void) +{ + if (machine_is_pseries()) { + hcall(H_CPPR, 0); + } +} + +void register_ipi(void (*fn)(struct pt_regs *, void *), void *data) +{ + ipi_fn = fn; + if (machine_is_powernv()) { + handle_exception(0xe80, &dbell_handler, data); + } else { + handle_exception(0x500, &extint_handler, data); + } +} + +void unregister_ipi(void) +{ + if (machine_is_powernv()) { + handle_exception(0xe80, NULL, NULL); + } else { + handle_exception(0x500, NULL, NULL); + } +} + +void send_ipi(int cpu_id) +{ + if (machine_is_powernv()) { + unsigned long rb = (5 << (63-36)) | cpu_id; + asm volatile("lwsync" ::: "memory"); + asm volatile("msgsnd %0" :: "r"(rb) : "memory"); + } else { + hcall(H_IPI, cpu_id, 4); + } +} + +static int nr_started = 1; + +extern void start_secondary(uint64_t server_no); /* asm entry point */ + +static bool cpu_is_running(int cpu_id) +{ + if (machine_is_powernv()) { + int64_t ret; + uint8_t status; + + ret = opal_call(OPAL_QUERY_CPU_STATUS, cpu_id, (unsigned long)&status, 0); + if (ret != OPAL_SUCCESS) { + printf("OPAL_QUERY_CPU_STATUS failed for cpu %d\n", cpu_id); + return false; + } + return (status != OPAL_THREAD_INACTIVE); + } else { + uint32_t query_token; + int outputs[1], ret; + + ret = rtas_token("query-cpu-stopped-state", &query_token); + if (ret != 0) { + printf("rtas token query-cpu-stopped-state failed\n"); + return false; + } + + ret = rtas_call(query_token, 1, 2, outputs, cpu_id); + if (ret) { + printf("query-cpu-stopped-state failed for cpu %d\n", cpu_id); + return ret; + } + if (outputs[0]) /* cpu not in stopped state */ + return true; + return false; + } +} + /* * Start stopped thread cpu_id at entry * Returns: <0 on failure to start stopped cpu * 0 on success * >0 on cpu not in stopped state */ -int start_thread(int cpu_id, secondary_entry_fn entry, uint32_t r3) +static int start_thread(int cpu_id, secondary_entry_fn entry) { - uint32_t query_token, start_token; - int outputs[1], ret; + struct cpu *cpu; + uint64_t tb; - ret = rtas_token("query-cpu-stopped-state", &query_token); - assert(ret == 0); - ret = rtas_token("start-cpu", &start_token); - assert(ret == 0); + if (nr_started >= NR_CPUS) { + /* Reached limit */ + return -1; + } + + if (cpu_id == smp_processor_id()) { + /* Boot CPU already started */ + return -1; + } - ret = rtas_call(query_token, 1, 2, outputs, cpu_id); - if (ret) { - printf("query-cpu-stopped-state failed for cpu %d\n", cpu_id); - } else if (!outputs[0]) { /* cpu in stopped state */ - ret = rtas_call(start_token, 3, 1, NULL, cpu_id, entry, r3); - if (ret) + tb = get_tb(); + while (cpu_is_running(cpu_id)) { + if (get_tb() - tb > 3*tb_hz) { + printf("Unable to start running CPU:%d\n", cpu_id); + return 1; + } + } + + cpu = &cpus[nr_started]; + nr_started++; + + cpu_init(cpu, cpu_id); + cpu->entry = entry; + + if (machine_is_powernv()) { + if (opal_call(OPAL_START_CPU, cpu_id, (unsigned long)start_secondary, 0) != OPAL_SUCCESS) { printf("failed to start cpu %d\n", cpu_id); - } else { /* cpu not in stopped state */ - ret = outputs[0]; + return -1; + } + } else { + uint32_t start_token; + int ret; + + ret = rtas_token("start-cpu", &start_token); + assert(ret == 0); + + ret = rtas_call(start_token, 3, 1, NULL, cpu_id, start_secondary, cpu_id); + if (ret) { + printf("failed to start cpu %d\n", cpu_id); + return ret; + } } - return ret; + return 0; } /* * Start all stopped threads (vcpus) on cpu_node * Returns: Number of stopped cpus which were successfully started */ -struct start_threads start_cpu(int cpu_node, secondary_entry_fn entry, - uint32_t r3) +static void start_core(int cpu_node, secondary_entry_fn entry) { - int len, i, nr_threads, nr_started = 0; + int len, i, nr_threads; const struct fdt_property *prop; u32 *threads; @@ -67,23 +262,18 @@ struct start_threads start_cpu(int cpu_node, secondary_entry_fn entry, assert(prop); nr_threads = len >> 2; /* Divide by 4 since 4 bytes per thread */ - threads = (u32 *)prop->data; /* Array of valid ids */ - for (i = 0; i < nr_threads; i++) { - if (!start_thread(fdt32_to_cpu(threads[i]), entry, r3)) - nr_started++; - } + threads = (u32 *)prop->data; /* Array of valid ids */ - return (struct start_threads) { nr_threads, nr_started }; + for (i = 0; i < nr_threads; i++) + start_thread(fdt32_to_cpu(threads[i]), entry); } static void start_each_secondary(int fdtnode, u64 regval __unused, void *info) { struct secondary_entry_data *datap = info; - struct start_threads ret = start_cpu(fdtnode, datap->entry, datap->r3); - nr_threads += ret.nr_threads; - datap->nr_started += ret.nr_started; + start_core(fdtnode, datap->entry); } /* @@ -92,14 +282,34 @@ static void start_each_secondary(int fdtnode, u64 regval __unused, void *info) * Returns: TRUE on success * FALSE on failure */ -bool start_all_cpus(secondary_entry_fn entry, uint32_t r3) +bool start_all_cpus(secondary_entry_fn entry) { - struct secondary_entry_data data = { entry, r3, 0 }; + struct secondary_entry_data data = { entry }; + uint64_t tb; int ret; + assert(nr_cpus_online == 1); + assert(nr_started == 1); ret = dt_for_each_cpu_node(start_each_secondary, &data); assert(ret == 0); + assert(nr_started == nr_cpus_present); - /* We expect that we come in with one thread already started */ - return data.nr_started == nr_threads - 1; + tb = get_tb(); + while (nr_cpus_online < nr_cpus_present) { + if (get_tb() - tb > 3*tb_hz) { + printf("failed to start all secondaries\n"); + assert(0); + } + cpu_relax(); + } + + return 1; +} + +void stop_all_cpus(void) +{ + while (nr_cpus_online > 1) + cpu_relax(); + mb(); + nr_started = 1; } diff --git a/lib/ppc64/asm-offsets.c b/lib/ppc64/asm-offsets.c index 7843a20b4..0ac2c9a75 100644 --- a/lib/ppc64/asm-offsets.c +++ b/lib/ppc64/asm-offsets.c @@ -6,6 +6,8 @@ #include #include #include +#include +#include int main(void) { @@ -50,5 +52,10 @@ int main(void) DEFINE(_XER, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, xer)); DEFINE(_CCR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, ccr)); DEFINE(_TRAP, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, trap)); + + DEFINE(SIZEOF_STRUCT_CPU, sizeof(struct cpu)); + DEFINE(EXCEPTION_STACK, offsetof(struct cpu, exception_stack)); + DEFINE(MAX_CPUS, NR_CPUS); + return 0; } diff --git a/lib/ppc64/asm/atomic.h b/lib/ppc64/asm/atomic.h new file mode 100644 index 000000000..0f461b9ce --- /dev/null +++ b/lib/ppc64/asm/atomic.h @@ -0,0 +1,6 @@ +#ifndef _POWERPC_ATOMIC_H_ +#define _POWERPC_ATOMIC_H_ + +#include "asm-generic/atomic.h" + +#endif /* _POWERPC_ATOMIC_H_ */ diff --git a/lib/ppc64/asm/barrier.h b/lib/ppc64/asm/barrier.h index 76f6efa78..475434b6a 100644 --- a/lib/ppc64/asm/barrier.h +++ b/lib/ppc64/asm/barrier.h @@ -1,6 +1,9 @@ #ifndef _ASMPPC64_BARRIER_H_ #define _ASMPPC64_BARRIER_H_ +#define cpu_relax() asm volatile("or 1,1,1 ; or 2,2,2" ::: "memory") +#define pause_short() asm volatile(".long 0x7c40003c" ::: "memory") + #define mb() asm volatile("sync":::"memory") #define rmb() asm volatile("sync":::"memory") #define wmb() asm volatile("sync":::"memory") diff --git a/lib/ppc64/asm/opal.h b/lib/ppc64/asm/opal.h index de64e2c8d..6c3e9ffe2 100644 --- a/lib/ppc64/asm/opal.h +++ b/lib/ppc64/asm/opal.h @@ -2,14 +2,21 @@ #ifndef _ASMPPC64_OPAL_H_ #define _ASMPPC64_OPAL_H_ +#include + #define OPAL_SUCCESS 0 #define OPAL_CONSOLE_WRITE 1 #define OPAL_CONSOLE_READ 2 #define OPAL_CEC_POWER_DOWN 5 #define OPAL_POLL_EVENTS 10 +#define OPAL_START_CPU 41 +#define OPAL_QUERY_CPU_STATUS 42 +#define OPAL_RETURN_CPU 69 #define OPAL_REINIT_CPUS 70 # define OPAL_REINIT_CPUS_HILE_BE (1 << 0) # define OPAL_REINIT_CPUS_HILE_LE (1 << 1) +int64_t opal_call(int64_t token, int64_t arg1, int64_t arg2, int64_t arg3); + #endif diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common index 68165fc25..744dfc1f7 100644 --- a/powerpc/Makefile.common +++ b/powerpc/Makefile.common @@ -12,6 +12,7 @@ tests-common = \ $(TEST_DIR)/rtas.elf \ $(TEST_DIR)/emulator.elf \ $(TEST_DIR)/tm.elf \ + $(TEST_DIR)/smp.elf \ $(TEST_DIR)/sprs.elf \ $(TEST_DIR)/interrupts.elf diff --git a/powerpc/cstart64.S b/powerpc/cstart64.S index 405cb0561..8c4da65bc 100644 --- a/powerpc/cstart64.S +++ b/powerpc/cstart64.S @@ -125,6 +125,49 @@ start: bl exit b halt +/* + * start_secondary is the secondary entry point. r3 contains the cpu id + */ +.globl start_secondary +start_secondary: + FIXUP_ENDIAN + /* Switch to 64-bit mode */ + mfmsr r1 + li r2,1 + sldi r2,r2,MSR_SF_BIT + or r1,r1,r2 + mtmsrd r1 + + bl 0f +0: mflr r31 + subi r31, r31, 0b - start /* QEMU's kernel load address */ + + ld r2, (p_toc - start)(r31) + + LOAD_REG_ADDR(r9, cpus) + li r8,0 + li r7,0 +1: ldx r6,r9,r7 + cmpd r6,r3 + beq 2f + addi r7,r7,SIZEOF_STRUCT_CPU + addi r8,r8,1 + cmpdi r8,MAX_CPUS + bne 1b + b . + +2: add r3,r9,r7 + ld r1,8(r3) + + /* Zero backpointers in initial stack frame so backtrace() stops */ + li r0,0 + std r0,0(r1) + std r0,16(r1) + + bl main_secondary + bl exit + b halt + .align 3 p_stack: .llong stackptr p_toc: .llong tocptr @@ -257,7 +300,8 @@ do_handle_exception_return: . = \vec mtsprg1 r1 /* save r1 */ - mfsprg0 r1 /* get exception stack address */ + mfsprg0 r1 /* get struct cpu address */ + ld r1,EXCEPTION_STACK(r1) /* get exception stack address */ subi r1,r1, INT_FRAME_SIZE /* save r0 and ctr to call generic handler */ @@ -273,7 +317,8 @@ do_handle_exception_return: . = \vec mtsprg1 r1 /* save r1 */ - mfsprg0 r1 /* get exception stack address */ + mfsprg0 r1 /* get struct cpu address */ + ld r1,EXCEPTION_STACK(r1) /* get exception stack address */ subi r1,r1, INT_FRAME_SIZE /* save r0 and ctr to call generic handler */ diff --git a/powerpc/selftest.c b/powerpc/selftest.c index 7acff7104..8d1a2c767 100644 --- a/powerpc/selftest.c +++ b/powerpc/selftest.c @@ -8,6 +8,7 @@ #include #include #include +#include static void check_setup(int argc, char **argv) { @@ -34,7 +35,8 @@ static void check_setup(int argc, char **argv) } else if (strcmp(argv[i], "smp") == 0) { - report(nr_cpus == (int)val, "nr_cpus = %d", nr_cpus); + report(nr_cpus_present == (int)val, + "nr_cpus_present = %d", nr_cpus_present); ++nr_tests; } diff --git a/powerpc/smp.c b/powerpc/smp.c new file mode 100644 index 000000000..644cf1c75 --- /dev/null +++ b/powerpc/smp.c @@ -0,0 +1,348 @@ +/* SPDX-License-Identifier: LGPL-2.0-only */ +/* + * SMP and IPI Tests + * + * Copyright 2024 Nicholas Piggin, IBM Corp. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static volatile bool start_test_running = true; +static volatile int nr_cpus_started; + +static void start_fn(int cpu_id) +{ + atomic_fetch_inc(&nr_cpus_started); + while (start_test_running) + cpu_relax(); + atomic_fetch_dec(&nr_cpus_started); +} + +static void test_start_cpus(int argc, char **argv) +{ + uint64_t tb; + + if (argc > 2) + report_abort("Unsupported argument: '%s'", argv[2]); + + nr_cpus_started = 1; + if (!start_all_cpus(start_fn)) + report_abort("Failed to start secondary cpus"); + + tb = get_tb(); + while (nr_cpus_started < nr_cpus_present) { + cpu_relax(); + if (get_tb() - tb > tb_hz * 5) + report_abort("Failed to start all secondaries"); + } + + if (nr_cpus_started != nr_cpus_online) + report_abort("Started CPUs does not match online"); + + barrier(); + start_test_running = false; + barrier(); + + tb = get_tb(); + while (nr_cpus_started > 1) { + cpu_relax(); + if (get_tb() - tb > tb_hz * 5) + report_abort("Failed to stop all secondaries"); + } + + stop_all_cpus(); + + report(true, "start cpus"); +} + +static volatile int nr_cpus_ipi = 0; + +static void ipi_handler(struct pt_regs *regs, void *data) +{ + atomic_fetch_inc(&nr_cpus_ipi); +} + +static volatile bool ipi_test_running = true; + +static void ipi_fn(int cpu_id) +{ + local_ipi_enable(); + + mtspr(SPR_DEC, 0x7fffffff); + local_irq_enable(); + while (ipi_test_running) + cpu_relax(); + local_irq_disable(); + + local_ipi_disable(); +} + +static void test_ipi_cpus(int argc, char **argv) +{ + uint64_t tb; + int i; + + if (argc > 2) + report_abort("Unsupported argument: '%s'", argv[2]); + + if (nr_cpus_present < 2) { + report_skip("Requires SMP (2 or more CPUs)"); + return; + } + + register_ipi(ipi_handler, NULL); + + if (!start_all_cpus(ipi_fn)) + report_abort("Failed to start secondary cpus"); + + for (i = 1; i < nr_cpus_online; i++) + send_ipi(cpus[i].server_no); + + tb = get_tb(); + while (nr_cpus_ipi < nr_cpus_online - 1) { + cpu_relax(); + if (get_tb() - tb > tb_hz * 5) + report_abort("Secondaries failed to respond to IPIs"); + } + + send_ipi(cpus[1].server_no); + + tb = get_tb(); + while (nr_cpus_ipi < nr_cpus_online) { + cpu_relax(); + if (get_tb() - tb > tb_hz * 5) + report_abort("Secondaries failed to respond to IPIs"); + } + + ipi_test_running = false; + + stop_all_cpus(); + + assert(nr_cpus_ipi == nr_cpus_present); + + unregister_ipi(); + + report(true, "IPI cpus"); +} + +static uint64_t time; +static bool time_went_backward; + +static void check_and_record_time(void) +{ + uint64_t tb; + uint64_t t; + uint64_t old; + + t = time; +again: + barrier(); + tb = get_tb(); + asm volatile("1: ldarx %0,0,%1 ; cmpd %0,%2 ; bne 2f ; stdcx. %3,0,%1 ; bne- 1b; 2:" : "=&r"(old) : "r"(&time), "r"(t), "r"(tb) : "memory", "cr0"); + assert(tb >= t); + if (old != t) { + t = old; + goto again; + } + if (old > tb) + time_went_backward = true; +} + +static void update_time(int64_t tb_offset) +{ + uint64_t new_tb; + + new_tb = get_tb() + tb_offset; + mtspr(SPR_TBU40, new_tb); + if ((get_tb() & 0xFFFFFF) < (new_tb & 0xFFFFFF)) { + new_tb += 0x1000000; + mtspr(SPR_TBU40, new_tb); + } +} + +static void time_sync_fn(int cpu_id) +{ + uint64_t start = get_tb(); + + while (!time_went_backward && get_tb() - start < tb_hz*2) { + check_and_record_time(); + cpu_relax(); + } + + while (!time_went_backward && get_tb() - start < tb_hz*2) { + check_and_record_time(); + udelay(1); + } + + if (machine_is_powernv()) { + while (!time_went_backward && get_tb() - start < tb_hz*2) { + check_and_record_time(); + update_time(0x1234000000); + cpu_relax(); + update_time(-0x1234000000); + } + } +} + +static void test_time_sync(int argc, char **argv) +{ + if (argc > 2) + report_abort("Unsupported argument: '%s'", argv[2]); + + if (nr_cpus_present < 2) { + report_skip("Requires SMP (2 or more CPUs)"); + return; + } + + time_went_backward = false; + + if (!start_all_cpus(time_sync_fn)) + report_abort("Failed to start secondary cpus"); + + time_sync_fn(-1); + + stop_all_cpus(); + + report(!time_went_backward, "time sync"); +} + +static volatile bool relax_test_running = true; + +static int relax_loop_count[NR_CPUS]; + +static void relax_fn(int cpu_id) +{ + volatile int i = 0; + + while (relax_test_running) { + cpu_relax(); + i++; + } + + relax_loop_count[cpu_id] = i; +} + +#define ITERS 1000000 + +static void test_relax(int argc, char **argv) +{ + volatile int i; + int count; + + if (argc > 2) + report_abort("Unsupported argument: '%s'", argv[2]); + + if (nr_cpus_present < 2) { + report_skip("Requires SMP (2 or more CPUs)"); + return; + } + + if (!start_all_cpus(relax_fn)) + report_abort("Failed to start secondary cpus"); + + for (i = 0; i < ITERS; i++) + ; + + relax_test_running = false; + + stop_all_cpus(); + + count = 0; + for (i = 0; i < NR_CPUS; i++) + count += relax_loop_count[i]; + if (count == 0) + count = 1; + + report(true, "busy-loops on CPU:%d vs cpu_relax-loops on others %ld%%", smp_processor_id(), (long)ITERS * 100 / count); +} + +static volatile bool pause_test_running = true; + +static int pause_loop_count[NR_CPUS]; + +static void pause_fn(int cpu_id) +{ + volatile int i = 0; + + while (pause_test_running) { + pause_short(); + i++; + } + + pause_loop_count[cpu_id] = i; +} + +#define ITERS 1000000 + +static void test_pause(int argc, char **argv) +{ + volatile int i; + int count; + + if (argc > 2) + report_abort("Unsupported argument: '%s'", argv[2]); + + if (!cpu_has_pause_short) + return; + + if (nr_cpus_present < 2) { + report_skip("Requires SMP (2 or more CPUs)"); + return; + } + + if (!start_all_cpus(pause_fn)) + report_abort("Failed to start secondary cpus"); + + for (i = 0; i < ITERS; i++) + ; + + pause_test_running = false; + + stop_all_cpus(); + + count = 0; + for (i = 0; i < NR_CPUS; i++) + count += pause_loop_count[i]; + + report(true, "busy-loops on CPU:%d vs pause_short-loops on others %ld%%", smp_processor_id(), (long)ITERS * 100 / count); +} + +struct { + const char *name; + void (*func)(int argc, char **argv); +} hctests[] = { + { "start_cpus", test_start_cpus }, + { "ipi_cpus", test_ipi_cpus }, + { "time_sync", test_time_sync }, + { "cpu_relax", test_relax }, + { "pause", test_pause }, + { NULL, NULL } +}; + +int main(int argc, char **argv) +{ + bool all; + int i; + + all = argc == 1 || !strcmp(argv[1], "all"); + + report_prefix_push("smp"); + + for (i = 0; hctests[i].name != NULL; i++) { + if (all || strcmp(argv[1], hctests[i].name) == 0) { + report_prefix_push(hctests[i].name); + hctests[i].func(argc, argv); + report_prefix_pop(); + } + } + + report_prefix_pop(); + return report_summary(); +} diff --git a/powerpc/tm.c b/powerpc/tm.c index 6b1ceeb6e..efbcf1f12 100644 --- a/powerpc/tm.c +++ b/powerpc/tm.c @@ -89,7 +89,7 @@ static void test_h_cede_tm(int argc, char **argv) if (argc > 2) report_abort("Unsupported argument: '%s'", argv[2]); - if (!start_all_cpus(halt, 0)) + if (!start_all_cpus(halt)) report_abort("Failed to start secondary cpus"); if (!enable_tm()) @@ -133,7 +133,7 @@ int main(int argc, char **argv) report_skip("TM is not available"); goto done; } - report(cpus_with_tm == nr_cpus, + report(cpus_with_tm == nr_cpus_present, "TM available in all 'ibm,pa-features' properties"); all = argc == 1 || !strcmp(argv[1], "all"); diff --git a/powerpc/unittests.cfg b/powerpc/unittests.cfg index 9fdc86b66..ddce409a8 100644 --- a/powerpc/unittests.cfg +++ b/powerpc/unittests.cfg @@ -74,6 +74,14 @@ file = emulator.elf [interrupts] file = interrupts.elf +[smp] +file = smp.elf +smp = 2 + +[smp-smt] +file = smp.elf +smp = 8,threads=4 + [h_cede_tm] file = tm.elf machine = pseries