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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c')
-rw-r--r-- | tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c b/tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c new file mode 100644 index 000000000..5edd35bd9 --- /dev/null +++ b/tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c @@ -0,0 +1,334 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc. + * + * PCI initialization based on example code from: + * Andreas Herrmann <andreas.herrmann3@amd.com> + */ + +#if defined(__i386__) || defined(__x86_64__) + +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include <time.h> +#include <string.h> + +#include <pci/pci.h> + +#include "idle_monitor/cpupower-monitor.h" +#include "helpers/helpers.h" + +#define PCI_NON_PC0_OFFSET 0xb0 +#define PCI_PC1_OFFSET 0xb4 +#define PCI_PC6_OFFSET 0xb8 + +#define PCI_MONITOR_ENABLE_REG 0xe0 + +#define PCI_NON_PC0_ENABLE_BIT 0 +#define PCI_PC1_ENABLE_BIT 1 +#define PCI_PC6_ENABLE_BIT 2 + +#define PCI_NBP1_STAT_OFFSET 0x98 +#define PCI_NBP1_ACTIVE_BIT 2 +#define PCI_NBP1_ENTERED_BIT 1 + +#define PCI_NBP1_CAP_OFFSET 0x90 +#define PCI_NBP1_CAPABLE_BIT 31 + +#define OVERFLOW_MS 343597 /* 32 bit register filled at 12500 HZ + (1 tick per 80ns) */ + +enum amd_fam14h_states {NON_PC0 = 0, PC1, PC6, NBP1, + AMD_FAM14H_STATE_NUM}; + +static int fam14h_get_count_percent(unsigned int self_id, double *percent, + unsigned int cpu); +static int fam14h_nbp1_count(unsigned int id, unsigned long long *count, + unsigned int cpu); + +static cstate_t amd_fam14h_cstates[AMD_FAM14H_STATE_NUM] = { + { + .name = "!PC0", + .desc = N_("Package in sleep state (PC1 or deeper)"), + .id = NON_PC0, + .range = RANGE_PACKAGE, + .get_count_percent = fam14h_get_count_percent, + }, + { + .name = "PC1", + .desc = N_("Processor Package C1"), + .id = PC1, + .range = RANGE_PACKAGE, + .get_count_percent = fam14h_get_count_percent, + }, + { + .name = "PC6", + .desc = N_("Processor Package C6"), + .id = PC6, + .range = RANGE_PACKAGE, + .get_count_percent = fam14h_get_count_percent, + }, + { + .name = "NBP1", + .desc = N_("North Bridge P1 boolean counter (returns 0 or 1)"), + .id = NBP1, + .range = RANGE_PACKAGE, + .get_count = fam14h_nbp1_count, + }, +}; + +static struct pci_access *pci_acc; +static struct pci_dev *amd_fam14h_pci_dev; +static int nbp1_entered; + +static struct timespec start_time; +static unsigned long long timediff; + +#ifdef DEBUG +struct timespec dbg_time; +long dbg_timediff; +#endif + +static unsigned long long *previous_count[AMD_FAM14H_STATE_NUM]; +static unsigned long long *current_count[AMD_FAM14H_STATE_NUM]; + +static int amd_fam14h_get_pci_info(struct cstate *state, + unsigned int *pci_offset, + unsigned int *enable_bit, + unsigned int cpu) +{ + switch (state->id) { + case NON_PC0: + *enable_bit = PCI_NON_PC0_ENABLE_BIT; + *pci_offset = PCI_NON_PC0_OFFSET; + break; + case PC1: + *enable_bit = PCI_PC1_ENABLE_BIT; + *pci_offset = PCI_PC1_OFFSET; + break; + case PC6: + *enable_bit = PCI_PC6_ENABLE_BIT; + *pci_offset = PCI_PC6_OFFSET; + break; + case NBP1: + *enable_bit = PCI_NBP1_ENTERED_BIT; + *pci_offset = PCI_NBP1_STAT_OFFSET; + break; + default: + return -1; + } + return 0; +} + +static int amd_fam14h_init(cstate_t *state, unsigned int cpu) +{ + int enable_bit, pci_offset, ret; + uint32_t val; + + ret = amd_fam14h_get_pci_info(state, &pci_offset, &enable_bit, cpu); + if (ret) + return ret; + + /* NBP1 needs extra treating -> write 1 to D18F6x98 bit 1 for init */ + if (state->id == NBP1) { + val = pci_read_long(amd_fam14h_pci_dev, pci_offset); + val |= 1 << enable_bit; + val = pci_write_long(amd_fam14h_pci_dev, pci_offset, val); + return ret; + } + + /* Enable monitor */ + val = pci_read_long(amd_fam14h_pci_dev, PCI_MONITOR_ENABLE_REG); + dprint("Init %s: read at offset: 0x%x val: %u\n", state->name, + PCI_MONITOR_ENABLE_REG, (unsigned int) val); + val |= 1 << enable_bit; + pci_write_long(amd_fam14h_pci_dev, PCI_MONITOR_ENABLE_REG, val); + + dprint("Init %s: offset: 0x%x enable_bit: %d - val: %u (%u)\n", + state->name, PCI_MONITOR_ENABLE_REG, enable_bit, + (unsigned int) val, cpu); + + /* Set counter to zero */ + pci_write_long(amd_fam14h_pci_dev, pci_offset, 0); + previous_count[state->id][cpu] = 0; + + return 0; +} + +static int amd_fam14h_disable(cstate_t *state, unsigned int cpu) +{ + int enable_bit, pci_offset, ret; + uint32_t val; + + ret = amd_fam14h_get_pci_info(state, &pci_offset, &enable_bit, cpu); + if (ret) + return ret; + + val = pci_read_long(amd_fam14h_pci_dev, pci_offset); + dprint("%s: offset: 0x%x %u\n", state->name, pci_offset, val); + if (state->id == NBP1) { + /* was the bit whether NBP1 got entered set? */ + nbp1_entered = (val & (1 << PCI_NBP1_ACTIVE_BIT)) | + (val & (1 << PCI_NBP1_ENTERED_BIT)); + + dprint("NBP1 was %sentered - 0x%x - enable_bit: " + "%d - pci_offset: 0x%x\n", + nbp1_entered ? "" : "not ", + val, enable_bit, pci_offset); + return ret; + } + current_count[state->id][cpu] = val; + + dprint("%s: Current - %llu (%u)\n", state->name, + current_count[state->id][cpu], cpu); + dprint("%s: Previous - %llu (%u)\n", state->name, + previous_count[state->id][cpu], cpu); + + val = pci_read_long(amd_fam14h_pci_dev, PCI_MONITOR_ENABLE_REG); + val &= ~(1 << enable_bit); + pci_write_long(amd_fam14h_pci_dev, PCI_MONITOR_ENABLE_REG, val); + + return 0; +} + +static int fam14h_nbp1_count(unsigned int id, unsigned long long *count, + unsigned int cpu) +{ + if (id == NBP1) { + if (nbp1_entered) + *count = 1; + else + *count = 0; + return 0; + } + return -1; +} +static int fam14h_get_count_percent(unsigned int id, double *percent, + unsigned int cpu) +{ + unsigned long diff; + + if (id >= AMD_FAM14H_STATE_NUM) + return -1; + /* residency count in 80ns -> divide through 12.5 to get us residency */ + diff = current_count[id][cpu] - previous_count[id][cpu]; + + if (timediff == 0) + *percent = 0.0; + else + *percent = 100.0 * diff / timediff / 12.5; + + dprint("Timediff: %llu - res~: %lu us - percent: %.2f %%\n", + timediff, diff * 10 / 125, *percent); + + return 0; +} + +static int amd_fam14h_start(void) +{ + int num, cpu; + clock_gettime(CLOCK_REALTIME, &start_time); + for (num = 0; num < AMD_FAM14H_STATE_NUM; num++) { + for (cpu = 0; cpu < cpu_count; cpu++) + amd_fam14h_init(&amd_fam14h_cstates[num], cpu); + } +#ifdef DEBUG + clock_gettime(CLOCK_REALTIME, &dbg_time); + dbg_timediff = timespec_diff_us(start_time, dbg_time); + dprint("Enabling counters took: %lu us\n", + dbg_timediff); +#endif + return 0; +} + +static int amd_fam14h_stop(void) +{ + int num, cpu; + struct timespec end_time; + + clock_gettime(CLOCK_REALTIME, &end_time); + + for (num = 0; num < AMD_FAM14H_STATE_NUM; num++) { + for (cpu = 0; cpu < cpu_count; cpu++) + amd_fam14h_disable(&amd_fam14h_cstates[num], cpu); + } +#ifdef DEBUG + clock_gettime(CLOCK_REALTIME, &dbg_time); + dbg_timediff = timespec_diff_us(end_time, dbg_time); + dprint("Disabling counters took: %lu ns\n", dbg_timediff); +#endif + timediff = timespec_diff_us(start_time, end_time); + if (timediff / 1000 > OVERFLOW_MS) + print_overflow_err((unsigned int)timediff / 1000000, + OVERFLOW_MS / 1000); + + return 0; +} + +static int is_nbp1_capable(void) +{ + uint32_t val; + val = pci_read_long(amd_fam14h_pci_dev, PCI_NBP1_CAP_OFFSET); + return val & (1 << 31); +} + +struct cpuidle_monitor *amd_fam14h_register(void) +{ + int num; + + if (cpupower_cpu_info.vendor != X86_VENDOR_AMD) + return NULL; + + if (cpupower_cpu_info.family == 0x14) + strncpy(amd_fam14h_monitor.name, "Fam_14h", + MONITOR_NAME_LEN - 1); + else if (cpupower_cpu_info.family == 0x12) + strncpy(amd_fam14h_monitor.name, "Fam_12h", + MONITOR_NAME_LEN - 1); + else + return NULL; + + /* We do not alloc for nbp1 machine wide counter */ + for (num = 0; num < AMD_FAM14H_STATE_NUM - 1; num++) { + previous_count[num] = calloc(cpu_count, + sizeof(unsigned long long)); + current_count[num] = calloc(cpu_count, + sizeof(unsigned long long)); + } + + /* We need PCI device: Slot 18, Func 6, compare with BKDG + for fam 12h/14h */ + amd_fam14h_pci_dev = pci_slot_func_init(&pci_acc, 0x18, 6); + if (amd_fam14h_pci_dev == NULL || pci_acc == NULL) + return NULL; + + if (!is_nbp1_capable()) + amd_fam14h_monitor.hw_states_num = AMD_FAM14H_STATE_NUM - 1; + + amd_fam14h_monitor.name_len = strlen(amd_fam14h_monitor.name); + return &amd_fam14h_monitor; +} + +static void amd_fam14h_unregister(void) +{ + int num; + for (num = 0; num < AMD_FAM14H_STATE_NUM - 1; num++) { + free(previous_count[num]); + free(current_count[num]); + } + pci_cleanup(pci_acc); +} + +struct cpuidle_monitor amd_fam14h_monitor = { + .name = "", + .hw_states = amd_fam14h_cstates, + .hw_states_num = AMD_FAM14H_STATE_NUM, + .start = amd_fam14h_start, + .stop = amd_fam14h_stop, + .do_register = amd_fam14h_register, + .unregister = amd_fam14h_unregister, + .flags.needs_root = 1, + .overflow_s = OVERFLOW_MS / 1000, +}; +#endif /* #if defined(__i386__) || defined(__x86_64__) */ |