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[220.235.194.103]) by smtp.gmail.com with ESMTPSA id x24-20020aa784d8000000b006e463414493sm3626693pfn.105.2024.02.26.02.14.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Feb 2024 02:14:31 -0800 (PST) From: Nicholas Piggin To: Thomas Huth Cc: Nicholas Piggin , Laurent Vivier , Andrew Jones , Paolo Bonzini , Joel Stanley , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org Subject: [kvm-unit-tests PATCH 28/32] powerpc: add pmu tests Date: Mon, 26 Feb 2024 20:12:14 +1000 Message-ID: <20240226101218.1472843-29-npiggin@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240226101218.1472843-1-npiggin@gmail.com> References: <20240226101218.1472843-1-npiggin@gmail.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add some initial PMU testing. - PMC5/6 tests - PMAE / PMI test - BHRB basic tests Signed-off-by: Nicholas Piggin --- lib/powerpc/asm/processor.h | 2 + lib/powerpc/asm/reg.h | 9 + lib/powerpc/asm/setup.h | 1 + lib/powerpc/setup.c | 23 +++ powerpc/Makefile.common | 3 +- powerpc/pmu.c | 337 ++++++++++++++++++++++++++++++++++++ powerpc/unittests.cfg | 3 + 7 files changed, 377 insertions(+), 1 deletion(-) create mode 100644 powerpc/pmu.c diff --git a/lib/powerpc/asm/processor.h b/lib/powerpc/asm/processor.h index 749155696..28239c610 100644 --- a/lib/powerpc/asm/processor.h +++ b/lib/powerpc/asm/processor.h @@ -14,6 +14,8 @@ extern bool cpu_has_hv; extern bool cpu_has_power_mce; extern bool cpu_has_siar; extern bool cpu_has_heai; +extern bool cpu_has_bhrb; +extern bool cpu_has_p10_bhrb; extern bool cpu_has_radix; extern bool cpu_has_prefix; extern bool cpu_has_sc_lev; diff --git a/lib/powerpc/asm/reg.h b/lib/powerpc/asm/reg.h index 69ef21adb..602fba1b6 100644 --- a/lib/powerpc/asm/reg.h +++ b/lib/powerpc/asm/reg.h @@ -40,10 +40,19 @@ #define SPR_LPIDR 0x13f #define SPR_HEIR 0x153 #define SPR_PTCR 0x1d0 +#define SPR_MMCRA 0x312 +#define MMCRA_BHRBRD UL(0x0000002000000000) +#define MMCRA_IFM_MASK UL(0x00000000c0000000) +#define SPR_PMC5 0x317 +#define SPR_PMC6 0x318 #define SPR_MMCR0 0x31b #define MMCR0_FC UL(0x80000000) +#define MMCR0_FCP UL(0x20000000) #define MMCR0_PMAE UL(0x04000000) +#define MMCR0_BHRBA UL(0x00200000) +#define MMCR0_FCPC UL(0x00001000) #define MMCR0_PMAO UL(0x00000080) +#define MMCR0_FC56 UL(0x00000010) #define SPR_SIAR 0x31c /* Machine State Register definitions: */ diff --git a/lib/powerpc/asm/setup.h b/lib/powerpc/asm/setup.h index 9ca318ce6..8f0b58ed0 100644 --- a/lib/powerpc/asm/setup.h +++ b/lib/powerpc/asm/setup.h @@ -10,6 +10,7 @@ #define NR_CPUS 8 /* arbitrarily set for now */ extern uint64_t tb_hz; +extern uint64_t cpu_hz; #define NR_MEM_REGIONS 8 #define MR_F_PRIMARY (1U << 0) diff --git a/lib/powerpc/setup.c b/lib/powerpc/setup.c index 30b988a5c..42ba06ad1 100644 --- a/lib/powerpc/setup.c +++ b/lib/powerpc/setup.c @@ -32,6 +32,7 @@ u32 initrd_size; u32 cpu_to_hwid[NR_CPUS] = { [0 ... NR_CPUS-1] = (~0U) }; int nr_cpus_present; uint64_t tb_hz; +uint64_t cpu_hz; struct mem_region mem_regions[NR_MEM_REGIONS]; phys_addr_t __physical_start, __physical_end; @@ -41,6 +42,7 @@ struct cpu_set_params { unsigned icache_bytes; unsigned dcache_bytes; uint64_t tb_hz; + uint64_t cpu_hz; }; static void cpu_set(int fdtnode, u64 regval, void *info) @@ -94,6 +96,22 @@ static void cpu_set(int fdtnode, u64 regval, void *info) data = (u32 *)prop->data; params->tb_hz = fdt32_to_cpu(*data); + prop = fdt_get_property(dt_fdt(), fdtnode, + "ibm,extended-clock-frequency", NULL); + if (prop) { + data = (u32 *)prop->data; + params->cpu_hz = fdt32_to_cpu(*data); + params->cpu_hz <<= 32; + data = (u32 *)prop->data + 1; + params->cpu_hz |= fdt32_to_cpu(*data); + } else { + prop = fdt_get_property(dt_fdt(), fdtnode, + "clock-frequency", NULL); + assert(prop != NULL); + data = (u32 *)prop->data; + params->cpu_hz = fdt32_to_cpu(*data); + } + read_common_info = true; } } @@ -102,6 +120,8 @@ bool cpu_has_hv; bool cpu_has_power_mce; /* POWER CPU machine checks */ bool cpu_has_siar; bool cpu_has_heai; +bool cpu_has_bhrb; +bool cpu_has_p10_bhrb; bool cpu_has_radix; bool cpu_has_prefix; bool cpu_has_sc_lev; /* sc interrupt has LEV field in SRR1 */ @@ -118,12 +138,14 @@ static void cpu_init_params(void) __icache_bytes = params.icache_bytes; __dcache_bytes = params.dcache_bytes; tb_hz = params.tb_hz; + cpu_hz = params.cpu_hz; 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; + cpu_has_p10_bhrb = true; case PVR_VER_POWER9: cpu_has_radix = true; case PVR_VER_POWER8E: @@ -132,6 +154,7 @@ static void cpu_init_params(void) cpu_has_power_mce = true; cpu_has_heai = true; cpu_has_siar = true; + cpu_has_bhrb = true; break; default: break; diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common index 410a675d9..64a3d93e4 100644 --- a/powerpc/Makefile.common +++ b/powerpc/Makefile.common @@ -17,7 +17,8 @@ tests-common = \ $(TEST_DIR)/smp.elf \ $(TEST_DIR)/sprs.elf \ $(TEST_DIR)/timebase.elf \ - $(TEST_DIR)/interrupts.elf + $(TEST_DIR)/interrupts.elf \ + $(TEST_DIR)/pmu.elf tests-all = $(tests-common) $(tests) all: directories $(TEST_DIR)/boot_rom.bin $(tests-all) diff --git a/powerpc/pmu.c b/powerpc/pmu.c new file mode 100644 index 000000000..df0604261 --- /dev/null +++ b/powerpc/pmu.c @@ -0,0 +1,337 @@ +/* + * Test PMU + * + * Copyright 2024 Nicholas Piggin, IBM Corp. + * + * This work is licensed under the terms of the GNU LGPL, version 2. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "alloc_phys.h" +#include "vmalloc.h" + +static volatile bool got_interrupt; +static volatile struct pt_regs recorded_regs; +static volatile unsigned long recorded_mmcr0; + +static void reset_mmcr0(void) +{ + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | (MMCR0_FC | MMCR0_FC56)); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~(MMCR0_PMAE | MMCR0_PMAO)); +} + +static __attribute__((__noinline__)) unsigned long pmc5_count_nr_insns(unsigned long nr) +{ + reset_mmcr0(); + mtspr(SPR_PMC5, 0); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~(MMCR0_FC | MMCR0_FC56)); + asm volatile("mtctr %0 ; 1: bdnz 1b" :: "r"(nr) : "ctr"); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | (MMCR0_FC | MMCR0_FC56)); + + return mfspr(SPR_PMC5); +} + +static void test_pmc56(void) +{ + unsigned long tmp; + + report_prefix_push("pmc56"); + + reset_mmcr0(); + mtspr(SPR_PMC5, 0); + mtspr(SPR_PMC6, 0); + report(mfspr(SPR_PMC5) == 0, "PMC5 zeroed"); + report(mfspr(SPR_PMC6) == 0, "PMC6 zeroed"); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~MMCR0_FC); + msleep(100); + report(mfspr(SPR_PMC5) == 0, "PMC5 frozen"); + report(mfspr(SPR_PMC6) == 0, "PMC6 frozen"); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~MMCR0_FC56); + mdelay(100); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | (MMCR0_FC | MMCR0_FC56)); + report(mfspr(SPR_PMC5) != 0, "PMC5 counting"); + report(mfspr(SPR_PMC6) != 0, "PMC6 counting"); + + /* Dynamic frequency scaling could cause to be out, so don't fail. */ + tmp = mfspr(SPR_PMC6); + report(true, "PMC6 ratio to reported clock frequency is %ld%%", tmp * 1000 / cpu_hz); + + tmp = pmc5_count_nr_insns(100); + tmp = pmc5_count_nr_insns(1000) - tmp; + report(tmp == 900, "PMC5 counts instructions precisely"); + + report_prefix_pop(); +} + +static void dec_ignore_handler(struct pt_regs *regs, void *data) +{ + mtspr(SPR_DEC, 0x7fffffff); +} + +static void pmi_handler(struct pt_regs *regs, void *data) +{ + got_interrupt = true; + memcpy((void *)&recorded_regs, regs, sizeof(struct pt_regs)); + recorded_mmcr0 = mfspr(SPR_MMCR0); + if (mfspr(SPR_MMCR0) & MMCR0_PMAO) { + /* This may cause infinite interrupts, so clear it. */ + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~MMCR0_PMAO); + } +} + +static void test_pmi(void) +{ + report_prefix_push("pmi"); + handle_exception(0x900, &dec_ignore_handler, NULL); + handle_exception(0xf00, &pmi_handler, NULL); + reset_mmcr0(); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | MMCR0_PMAO); + mtmsr(mfmsr() | MSR_EE); + mtmsr(mfmsr() & ~MSR_EE); + report(got_interrupt, "PMAO caused interrupt"); + handle_exception(0xf00, NULL, NULL); + handle_exception(0x900, NULL, NULL); + report_prefix_pop(); +} + +static void clrbhrb(void) +{ + asm volatile("clrbhrb" ::: "memory"); +} + +static inline unsigned long mfbhrbe(int nr) +{ + unsigned long e; + + asm volatile("mfbhrbe %0,%1" : "=r"(e) : "i"(nr) : "memory"); + + return e; +} + +extern unsigned char dummy_branch_1[]; +extern unsigned char dummy_branch_2[]; + +static __attribute__((__noinline__)) void bhrb_dummy(int i) +{ + asm volatile( + " cmpdi %0,1 \n\t" + " beq 1f \n\t" + ".global dummy_branch_1 \n\t" + "dummy_branch_1: \n\t" + " b 2f \n\t" + "1: trap \n\t" + ".global dummy_branch_2 \n\t" + "dummy_branch_2: \n\t" + "2: bne 3f \n\t" + " trap \n\t" + "3: nop \n\t" + : : "r"(i)); +} + +#define NR_BHRBE 16 +static unsigned long bhrbe[NR_BHRBE]; +static int nr_bhrbe; + +static void run_and_load_bhrb(void) +{ + int i; + + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~MMCR0_PMAE); + clrbhrb(); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | MMCR0_BHRBA); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~(MMCR0_FC | MMCR0_FCP | MMCR0_FCPC)); + mtspr(SPR_MMCRA, mfspr(SPR_MMCRA) & ~(MMCRA_BHRBRD | MMCRA_IFM_MASK)); + + if (cpu_has_p10_bhrb) { + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | MMCR0_PMAE); + asm volatile("isync" ::: "memory"); + enter_usermode(); + bhrb_dummy(0); + exit_usermode(); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~MMCR0_PMAE); + asm volatile("isync" ::: "memory"); + } else { + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | MMCR0_PMAE); + asm volatile("isync" ::: "memory"); + mtmsr(mfmsr()); + asm volatile(".rept 100 ; nop ; .endr"); + bhrb_dummy(0); + mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~MMCR0_PMAE); + asm volatile("isync" ::: "memory"); + } + + bhrbe[0] = mfbhrbe(0); + bhrbe[1] = mfbhrbe(1); + bhrbe[2] = mfbhrbe(2); + bhrbe[3] = mfbhrbe(3); + bhrbe[4] = mfbhrbe(4); + bhrbe[5] = mfbhrbe(5); + bhrbe[6] = mfbhrbe(6); + bhrbe[7] = mfbhrbe(7); + bhrbe[8] = mfbhrbe(8); + bhrbe[9] = mfbhrbe(9); + bhrbe[10] = mfbhrbe(10); + bhrbe[11] = mfbhrbe(11); + bhrbe[12] = mfbhrbe(12); + bhrbe[13] = mfbhrbe(13); + bhrbe[14] = mfbhrbe(14); + bhrbe[15] = mfbhrbe(15); + + for (i = 0; i < NR_BHRBE; i++) { + bhrbe[i] &= ~0x1UL; /* remove prediction bit */ + if (!bhrbe[i]) + break; + } + nr_bhrbe = i; +} + +static void illegal_handler(struct pt_regs *regs, void *data) +{ + got_interrupt = true; + regs_advance_insn(regs); +} + +static void test_bhrb(void) +{ + int i; + + if (cpu_has_p10_bhrb && !vm_available()) + return; + + report_prefix_push("bhrb"); + + /* TCG doesn't impelment BHRB yet */ + handle_exception(0x700, &illegal_handler, NULL); + handle_exception(0xe40, &illegal_handler, NULL); + clrbhrb(); + handle_exception(0x700, NULL, NULL); + handle_exception(0xe40, NULL, NULL); + if (got_interrupt) { + got_interrupt = false; + report_skip("BHRB support missing"); + report_prefix_pop(); + return; + } + + handle_exception(0x900, &illegal_handler, NULL); + + if (vm_available()) { + handle_exception(0x900, &dec_ignore_handler, NULL); + setup_vm(); + } + reset_mmcr0(); + clrbhrb(); + if (cpu_has_p10_bhrb) { + enter_usermode(); + bhrb_dummy(0); + exit_usermode(); + } else { + bhrb_dummy(0); + } + report(mfbhrbe(0) == 0, "BHRB is frozen"); + + /* + * BHRB may be cleared at any time (e.g., by OS or hypervisor) + * so this test could be occasionally incorrect. Try several + * times before giving up... + */ + + if (cpu_has_p10_bhrb) { + /* + * BHRB should have 8 entries: + * 1. enter_usermode blr + * 2. enter_usermode blr target + * 3. bl dummy + * 4. dummy unconditional + * 5. dummy conditional + * 6. dummy blr + * 7. dummy blr target + * 8. exit_usermode bl + * + * POWER10 often gives 4 entries, if other threads are + * running on the core, it seems to struggle. + */ + for (i = 0; i < 200; i++) { + run_and_load_bhrb(); + if (nr_bhrbe == 8) + break; + if (i > 100 && nr_bhrbe == 4) + break; + } + if (nr_bhrbe != 8) + printf("nr_bhrbe=%d\n", nr_bhrbe); + report(nr_bhrbe, "BHRB has been written"); + if (nr_bhrbe == 8) { + report(nr_bhrbe == 8, "BHRB has written 8 entries"); + report(bhrbe[4] == (unsigned long)dummy_branch_1, + "correct unconditional branch address"); + report(bhrbe[3] == (unsigned long)dummy_branch_2, + "correct conditional branch address"); + } else if (nr_bhrbe == 4) { + /* POWER10 workaround */ + report(nr_bhrbe == 4, "BHRB has written 4 entries"); + report(bhrbe[3] == (unsigned long)dummy_branch_2, + "correct conditional branch address"); + } + } else { + /* + * BHRB should have 6 entries: + * 1. bl dummy + * 2. dummy unconditional + * 3. dummy conditional + * 4. dummy blr + * 5. dummy blr target + * 6. Final b loop before disabled. + * + * POWER9 often gives 4 entries, if other threads are + * running on the core, it seems to struggle. + */ + for (i = 0; i < 200; i++) { + run_and_load_bhrb(); + if (nr_bhrbe == 6) + break; + if (i > 100 && nr_bhrbe == 4) + break; + } + report(nr_bhrbe, "BHRB has been written"); + report(nr_bhrbe == 6, "BHRB has written 6 entries"); + if (nr_bhrbe == 6) { + report(bhrbe[4] == (unsigned long)dummy_branch_1, + "correct unconditional branch address"); + report(bhrbe[3] == (unsigned long)dummy_branch_2, + "correct conditional branch address"); + } else if (nr_bhrbe == 4) { + /* POWER9 workaround */ + report(nr_bhrbe == 4, "BHRB has written 4 entries"); + report(bhrbe[3] == (unsigned long)dummy_branch_2, + "correct conditional branch address"); + } + } + + handle_exception(0x900, NULL, NULL); + + report_prefix_pop(); +} + +int main(int argc, char **argv) +{ + report_prefix_push("pmu"); + + test_pmc56(); + test_pmi(); + if (cpu_has_bhrb) + test_bhrb(); + + report_prefix_pop(); + + return report_summary(); +} diff --git a/powerpc/unittests.cfg b/powerpc/unittests.cfg index 008559b43..e275f389b 100644 --- a/powerpc/unittests.cfg +++ b/powerpc/unittests.cfg @@ -89,6 +89,9 @@ file = emulator.elf [interrupts] file = interrupts.elf +[pmu] +file = pmu.elf + [smp] file = smp.elf smp = 2