diff options
Diffstat (limited to 'arch/powerpc/perf')
| -rw-r--r-- | arch/powerpc/perf/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/perf/core-book3s.c | 172 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-24x7-catalog.h | 33 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-24x7.c | 510 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-24x7.h | 109 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-common.c | 39 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-common.h | 36 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-gpci.c | 294 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-gpci.h | 73 | ||||
| -rw-r--r-- | arch/powerpc/perf/power7-events-list.h | 10 | ||||
| -rw-r--r-- | arch/powerpc/perf/power8-pmu.c | 78 |
11 files changed, 1327 insertions, 29 deletions
diff --git a/arch/powerpc/perf/Makefile b/arch/powerpc/perf/Makefile index 60d71ee..f9c083a 100644 --- a/arch/powerpc/perf/Makefile +++ b/arch/powerpc/perf/Makefile @@ -11,5 +11,7 @@ obj32-$(CONFIG_PPC_PERF_CTRS) += mpc7450-pmu.o obj-$(CONFIG_FSL_EMB_PERF_EVENT) += core-fsl-emb.o obj-$(CONFIG_FSL_EMB_PERF_EVENT_E500) += e500-pmu.o e6500-pmu.o +obj-$(CONFIG_HV_PERF_CTRS) += hv-24x7.o hv-gpci.o hv-common.o + obj-$(CONFIG_PPC64) += $(obj64-y) obj-$(CONFIG_PPC32) += $(obj32-y) diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index 67cf220..4520c93 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -78,6 +78,7 @@ static unsigned int freeze_events_kernel = MMCR0_FCS; #define MMCR0_FC56 0 #define MMCR0_PMAO 0 #define MMCR0_EBE 0 +#define MMCR0_BHRBA 0 #define MMCR0_PMCC 0 #define MMCR0_PMCC_U6 0 @@ -120,6 +121,7 @@ static inline void power_pmu_bhrb_enable(struct perf_event *event) {} static inline void power_pmu_bhrb_disable(struct perf_event *event) {} void power_pmu_flush_branch_stack(void) {} static inline void power_pmu_bhrb_read(struct cpu_hw_events *cpuhw) {} +static void pmao_restore_workaround(bool ebb) { } #endif /* CONFIG_PPC32 */ static bool regs_use_siar(struct pt_regs *regs) @@ -502,8 +504,11 @@ static int ebb_event_check(struct perf_event *event) if (!leader->attr.pinned || !leader->attr.exclusive) return -EINVAL; - if (event->attr.inherit || event->attr.sample_period || - event->attr.enable_on_exec || event->attr.freq) + if (event->attr.freq || + event->attr.inherit || + event->attr.sample_type || + event->attr.sample_period || + event->attr.enable_on_exec) return -EINVAL; } @@ -542,13 +547,21 @@ static unsigned long ebb_switch_in(bool ebb, unsigned long mmcr0) if (!ebb) goto out; - /* Enable EBB and read/write to all 6 PMCs for userspace */ - mmcr0 |= MMCR0_EBE | MMCR0_PMCC_U6; + /* Enable EBB and read/write to all 6 PMCs and BHRB for userspace */ + mmcr0 |= MMCR0_EBE | MMCR0_BHRBA | MMCR0_PMCC_U6; - /* Add any bits from the user reg, FC or PMAO */ + /* + * Add any bits from the user MMCR0, FC or PMAO. This is compatible + * with pmao_restore_workaround() because we may add PMAO but we never + * clear it here. + */ mmcr0 |= current->thread.mmcr0; - /* Be careful not to set PMXE if userspace had it cleared */ + /* + * Be careful not to set PMXE if userspace had it cleared. This is also + * compatible with pmao_restore_workaround() because it has already + * cleared PMXE and we leave PMAO alone. + */ if (!(current->thread.mmcr0 & MMCR0_PMXE)) mmcr0 &= ~MMCR0_PMXE; @@ -559,13 +572,94 @@ static unsigned long ebb_switch_in(bool ebb, unsigned long mmcr0) out: return mmcr0; } -#endif /* CONFIG_PPC64 */ - -static void perf_event_interrupt(struct pt_regs *regs); -void perf_event_print_debug(void) +static void pmao_restore_workaround(bool ebb) { + unsigned pmcs[6]; + + if (!cpu_has_feature(CPU_FTR_PMAO_BUG)) + return; + + /* + * On POWER8E there is a hardware defect which affects the PMU context + * switch logic, ie. power_pmu_disable/enable(). + * + * When a counter overflows PMXE is cleared and FC/PMAO is set in MMCR0 + * by the hardware. Sometime later the actual PMU exception is + * delivered. + * + * If we context switch, or simply disable/enable, the PMU prior to the + * exception arriving, the exception will be lost when we clear PMAO. + * + * When we reenable the PMU, we will write the saved MMCR0 with PMAO + * set, and this _should_ generate an exception. However because of the + * defect no exception is generated when we write PMAO, and we get + * stuck with no counters counting but no exception delivered. + * + * The workaround is to detect this case and tweak the hardware to + * create another pending PMU exception. + * + * We do that by setting up PMC6 (cycles) for an imminent overflow and + * enabling the PMU. That causes a new exception to be generated in the + * chip, but we don't take it yet because we have interrupts hard + * disabled. We then write back the PMU state as we want it to be seen + * by the exception handler. When we reenable interrupts the exception + * handler will be called and see the correct state. + * + * The logic is the same for EBB, except that the exception is gated by + * us having interrupts hard disabled as well as the fact that we are + * not in userspace. The exception is finally delivered when we return + * to userspace. + */ + + /* Only if PMAO is set and PMAO_SYNC is clear */ + if ((current->thread.mmcr0 & (MMCR0_PMAO | MMCR0_PMAO_SYNC)) != MMCR0_PMAO) + return; + + /* If we're doing EBB, only if BESCR[GE] is set */ + if (ebb && !(current->thread.bescr & BESCR_GE)) + return; + + /* + * We are already soft-disabled in power_pmu_enable(). We need to hard + * enable to actually prevent the PMU exception from firing. + */ + hard_irq_disable(); + + /* + * This is a bit gross, but we know we're on POWER8E and have 6 PMCs. + * Using read/write_pmc() in a for loop adds 12 function calls and + * almost doubles our code size. + */ + pmcs[0] = mfspr(SPRN_PMC1); + pmcs[1] = mfspr(SPRN_PMC2); + pmcs[2] = mfspr(SPRN_PMC3); + pmcs[3] = mfspr(SPRN_PMC4); + pmcs[4] = mfspr(SPRN_PMC5); + pmcs[5] = mfspr(SPRN_PMC6); + + /* Ensure all freeze bits are unset */ + mtspr(SPRN_MMCR2, 0); + + /* Set up PMC6 to overflow in one cycle */ + mtspr(SPRN_PMC6, 0x7FFFFFFE); + + /* Enable exceptions and unfreeze PMC6 */ + mtspr(SPRN_MMCR0, MMCR0_PMXE | MMCR0_PMCjCE | MMCR0_PMAO); + + /* Now we need to refreeze and restore the PMCs */ + mtspr(SPRN_MMCR0, MMCR0_FC | MMCR0_PMAO); + + mtspr(SPRN_PMC1, pmcs[0]); + mtspr(SPRN_PMC2, pmcs[1]); + mtspr(SPRN_PMC3, pmcs[2]); + mtspr(SPRN_PMC4, pmcs[3]); + mtspr(SPRN_PMC5, pmcs[4]); + mtspr(SPRN_PMC6, pmcs[5]); } +#endif /* CONFIG_PPC64 */ + +static void perf_event_interrupt(struct pt_regs *regs); /* * Read one performance monitor counter (PMC). @@ -645,6 +739,57 @@ static void write_pmc(int idx, unsigned long val) } } +/* Called from sysrq_handle_showregs() */ +void perf_event_print_debug(void) +{ + unsigned long sdar, sier, flags; + u32 pmcs[MAX_HWEVENTS]; + int i; + + if (!ppmu->n_counter) + return; + + local_irq_save(flags); + + pr_info("CPU: %d PMU registers, ppmu = %s n_counters = %d", + smp_processor_id(), ppmu->name, ppmu->n_counter); + + for (i = 0; i < ppmu->n_counter; i++) + pmcs[i] = read_pmc(i + 1); + + for (; i < MAX_HWEVENTS; i++) + pmcs[i] = 0xdeadbeef; + + pr_info("PMC1: %08x PMC2: %08x PMC3: %08x PMC4: %08x\n", + pmcs[0], pmcs[1], pmcs[2], pmcs[3]); + + if (ppmu->n_counter > 4) + pr_info("PMC5: %08x PMC6: %08x PMC7: %08x PMC8: %08x\n", + pmcs[4], pmcs[5], pmcs[6], pmcs[7]); + + pr_info("MMCR0: %016lx MMCR1: %016lx MMCRA: %016lx\n", + mfspr(SPRN_MMCR0), mfspr(SPRN_MMCR1), mfspr(SPRN_MMCRA)); + + sdar = sier = 0; +#ifdef CONFIG_PPC64 + sdar = mfspr(SPRN_SDAR); + + if (ppmu->flags & PPMU_HAS_SIER) + sier = mfspr(SPRN_SIER); + + if (ppmu->flags & PPMU_EBB) { + pr_info("MMCR2: %016lx EBBHR: %016lx\n", + mfspr(SPRN_MMCR2), mfspr(SPRN_EBBHR)); + pr_info("EBBRR: %016lx BESCR: %016lx\n", + mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR)); + } +#endif + pr_info("SIAR: %016lx SDAR: %016lx SIER: %016lx\n", + mfspr(SPRN_SIAR), sdar, sier); + + local_irq_restore(flags); +} + /* * Check if a set of events can all go on the PMU at once. * If they can't, this will look at alternative codes for the events @@ -973,11 +1118,12 @@ static void power_pmu_disable(struct pmu *pmu) } /* - * Set the 'freeze counters' bit, clear EBE/PMCC/PMAO/FC56. + * Set the 'freeze counters' bit, clear EBE/BHRBA/PMCC/PMAO/FC56 */ val = mmcr0 = mfspr(SPRN_MMCR0); val |= MMCR0_FC; - val &= ~(MMCR0_EBE | MMCR0_PMCC | MMCR0_PMAO | MMCR0_FC56); + val &= ~(MMCR0_EBE | MMCR0_BHRBA | MMCR0_PMCC | MMCR0_PMAO | + MMCR0_FC56); /* * The barrier is to make sure the mtspr has been @@ -1144,6 +1290,8 @@ static void power_pmu_enable(struct pmu *pmu) cpuhw->mmcr[0] |= MMCR0_PMXE | MMCR0_FCECE; out_enable: + pmao_restore_workaround(ebb); + mmcr0 = ebb_switch_in(ebb, cpuhw->mmcr[0]); mb(); diff --git a/arch/powerpc/perf/hv-24x7-catalog.h b/arch/powerpc/perf/hv-24x7-catalog.h new file mode 100644 index 0000000..21b19dd --- /dev/null +++ b/arch/powerpc/perf/hv-24x7-catalog.h @@ -0,0 +1,33 @@ +#ifndef LINUX_POWERPC_PERF_HV_24X7_CATALOG_H_ +#define LINUX_POWERPC_PERF_HV_24X7_CATALOG_H_ + +#include <linux/types.h> + +/* From document "24x7 Event and Group Catalog Formats Proposal" v0.15 */ + +struct hv_24x7_catalog_page_0 { +#define HV_24X7_CATALOG_MAGIC 0x32347837 /* "24x7" in ASCII */ + __be32 magic; + __be32 length; /* In 4096 byte pages */ + __be64 version; /* XXX: arbitrary? what's the meaning/useage/purpose? */ + __u8 build_time_stamp[16]; /* "YYYYMMDDHHMMSS\0\0" */ + __u8 reserved2[32]; + __be16 schema_data_offs; /* in 4096 byte pages */ + __be16 schema_data_len; /* in 4096 byte pages */ + __be16 schema_entry_count; + __u8 reserved3[2]; + __be16 event_data_offs; + __be16 event_data_len; + __be16 event_entry_count; + __u8 reserved4[2]; + __be16 group_data_offs; /* in 4096 byte pages */ + __be16 group_data_len; /* in 4096 byte pages */ + __be16 group_entry_count; + __u8 reserved5[2]; + __be16 formula_data_offs; /* in 4096 byte pages */ + __be16 formula_data_len; /* in 4096 byte pages */ + __be16 formula_entry_count; + __u8 reserved6[2]; +} __packed; + +#endif diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c new file mode 100644 index 0000000..297c9105 --- /dev/null +++ b/arch/powerpc/perf/hv-24x7.c @@ -0,0 +1,510 @@ +/* + * Hypervisor supplied "24x7" performance counter support + * + * Author: Cody P Schafer <cody@linux.vnet.ibm.com> + * Copyright 2014 IBM Corporation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#define pr_fmt(fmt) "hv-24x7: " fmt + +#include <linux/perf_event.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <asm/firmware.h> +#include <asm/hvcall.h> +#include <asm/io.h> + +#include "hv-24x7.h" +#include "hv-24x7-catalog.h" +#include "hv-common.h" + +/* + * TODO: Merging events: + * - Think of the hcall as an interface to a 4d array of counters: + * - x = domains + * - y = indexes in the domain (core, chip, vcpu, node, etc) + * - z = offset into the counter space + * - w = lpars (guest vms, "logical partitions") + * - A single request is: x,y,y_last,z,z_last,w,w_last + * - this means we can retrieve a rectangle of counters in y,z for a single x. + * + * - Things to consider (ignoring w): + * - input cost_per_request = 16 + * - output cost_per_result(ys,zs) = 8 + 8 * ys + ys * zs + * - limited number of requests per hcall (must fit into 4K bytes) + * - 4k = 16 [buffer header] - 16 [request size] * request_count + * - 255 requests per hcall + * - sometimes it will be more efficient to read extra data and discard + */ + +/* + * Example usage: + * perf stat -e 'hv_24x7/domain=2,offset=8,starting_index=0,lpar=0xffffffff/' + */ + +/* u3 0-6, one of HV_24X7_PERF_DOMAIN */ +EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3); +/* u16 */ +EVENT_DEFINE_RANGE_FORMAT(starting_index, config, 16, 31); +/* u32, see "data_offset" */ +EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63); +/* u16 */ +EVENT_DEFINE_RANGE_FORMAT(lpar, config1, 0, 15); + +EVENT_DEFINE_RANGE(reserved1, config, 4, 15); +EVENT_DEFINE_RANGE(reserved2, config1, 16, 63); +EVENT_DEFINE_RANGE(reserved3, config2, 0, 63); + +static struct attribute *format_attrs[] = { + &format_attr_domain.attr, + &format_attr_offset.attr, + &format_attr_starting_index.attr, + &format_attr_lpar.attr, + NULL, +}; + +static struct attribute_group format_group = { + .name = "format", + .attrs = format_attrs, +}; + +static struct kmem_cache *hv_page_cache; + +/* + * read_offset_data - copy data from one buffer to another while treating the + * source buffer as a small view on the total avaliable + * source data. + * + * @dest: buffer to copy into + * @dest_len: length of @dest in bytes + * @requested_offset: the offset within the source data we want. Must be > 0 + * @src: buffer to copy data from + * @src_len: length of @src in bytes + * @source_offset: the offset in the sorce data that (src,src_len) refers to. + * Must be > 0 + * + * returns the number of bytes copied. + * + * The following ascii art shows the various buffer possitioning we need to + * handle, assigns some arbitrary varibles to points on the buffer, and then + * shows how we fiddle with those values to get things we care about (copy + * start in src and copy len) + * + * s = @src buffer + * d = @dest buffer + * '.' areas in d are written to. + * + * u + * x w v z + * d |.........| + * s |----------------------| + * + * u + * x w z v + * d |........------| + * s |------------------| + * + * x w u,z,v + * d |........| + * s |------------------| + * + * x,w u,v,z + * d |..................| + * s |------------------| + * + * x u + * w v z + * d |........| + * s |------------------| + * + * x z w v + * d |------| + * s |------| + * + * x = source_offset + * w = requested_offset + * z = source_offset + src_len + * v = requested_offset + dest_len + * + * w_offset_in_s = w - x = requested_offset - source_offset + * z_offset_in_s = z - x = src_len + * v_offset_in_s = v - x = request_offset + dest_len - src_len + */ +static ssize_t read_offset_data(void *dest, size_t dest_len, + loff_t requested_offset, void *src, + size_t src_len, loff_t source_offset) +{ + size_t w_offset_in_s = requested_offset - source_offset; + size_t z_offset_in_s = src_len; + size_t v_offset_in_s = requested_offset + dest_len - src_len; + size_t u_offset_in_s = min(z_offset_in_s, v_offset_in_s); + size_t copy_len = u_offset_in_s - w_offset_in_s; + + if (requested_offset < 0 || source_offset < 0) + return -EINVAL; + + if (z_offset_in_s <= w_offset_in_s) + return 0; + + memcpy(dest, src + w_offset_in_s, copy_len); + return copy_len; +} + +static unsigned long h_get_24x7_catalog_page(char page[static 4096], + u32 version, u32 index) +{ + WARN_ON(!IS_ALIGNED((unsigned long)page, 4096)); + return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE, + virt_to_phys(page), + version, + index); +} + +static ssize_t catalog_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t offset, size_t count) +{ + unsigned long hret; + ssize_t ret = 0; + size_t catalog_len = 0, catalog_page_len = 0, page_count = 0; + loff_t page_offset = 0; + uint32_t catalog_version_num = 0; + void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); + struct hv_24x7_catalog_page_0 *page_0 = page; + if (!page) + return -ENOMEM; + + hret = h_get_24x7_catalog_page(page, 0, 0); + if (hret) { + ret = -EIO; + goto e_free; + } + + catalog_version_num = be32_to_cpu(page_0->version); + catalog_page_len = be32_to_cpu(page_0->length); + catalog_len = catalog_page_len * 4096; + + page_offset = offset / 4096; + page_count = count / 4096; + + if (page_offset >= catalog_page_len) + goto e_free; + + if (page_offset != 0) { + hret = h_get_24x7_catalog_page(page, catalog_version_num, + page_offset); + if (hret) { + ret = -EIO; + goto e_free; + } + } + + ret = read_offset_data(buf, count, offset, + page, 4096, page_offset * 4096); +e_free: + if (hret) + pr_err("h_get_24x7_catalog_page(ver=%d, page=%lld) failed: rc=%ld\n", + catalog_version_num, page_offset, hret); + kfree(page); + + pr_devel("catalog_read: offset=%lld(%lld) count=%zu(%zu) catalog_len=%zu(%zu) => %zd\n", + offset, page_offset, count, page_count, catalog_len, + catalog_page_len, ret); + + return ret; +} + +#define PAGE_0_ATTR(_name, _fmt, _expr) \ +static ssize_t _name##_show(struct device *dev, \ + struct device_attribute *dev_attr, \ + char *buf) \ +{ \ + unsigned long hret; \ + ssize_t ret = 0; \ + void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \ + struct hv_24x7_catalog_page_0 *page_0 = page; \ + if (!page) \ + return -ENOMEM; \ + hret = h_get_24x7_catalog_page(page, 0, 0); \ + if (hret) { \ + ret = -EIO; \ + goto e_free; \ + } \ + ret = sprintf(buf, _fmt, _expr); \ +e_free: \ + kfree(page); \ + return ret; \ +} \ +static DEVICE_ATTR_RO(_name) + +PAGE_0_ATTR(catalog_version, "%lld\n", + (unsigned long long)be32_to_cpu(page_0->version)); +PAGE_0_ATTR(catalog_len, "%lld\n", + (unsigned long long)be32_to_cpu(page_0->length) * 4096); +static BIN_ATTR_RO(catalog, 0/* real length varies */); + +static struct bin_attribute *if_bin_attrs[] = { + &bin_attr_catalog, + NULL, +}; + +static struct attribute *if_attrs[] = { + &dev_attr_catalog_len.attr, + &dev_attr_catalog_version.attr, + NULL, +}; + +static struct attribute_group if_group = { + .name = "interface", + .bin_attrs = if_bin_attrs, + .attrs = if_attrs, +}; + +static const struct attribute_group *attr_groups[] = { + &format_group, + &if_group, + NULL, +}; + +static bool is_physical_domain(int domain) +{ + return domain == HV_24X7_PERF_DOMAIN_PHYSICAL_CHIP || + domain == HV_24X7_PERF_DOMAIN_PHYSICAL_CORE; +} + +static unsigned long single_24x7_request(u8 domain, u32 offset, u16 ix, + u16 lpar, u64 *res, + bool success_expected) +{ + unsigned long ret; + + /* + * request_buffer and result_buffer are not required to be 4k aligned, + * but are not allowed to cross any 4k boundary. Aligning them to 4k is + * the simplest way to ensure that. + */ + struct reqb { + struct hv_24x7_request_buffer buf; + struct hv_24x7_request req; + } __packed __aligned(4096) request_buffer = { + .buf = { + .interface_version = HV_24X7_IF_VERSION_CURRENT, + .num_requests = 1, + }, + .req = { + .performance_domain = domain, + .data_size = cpu_to_be16(8), + .data_offset = cpu_to_be32(offset), + .starting_lpar_ix = cpu_to_be16(lpar), + .max_num_lpars = cpu_to_be16(1), + .starting_ix = cpu_to_be16(ix), + .max_ix = cpu_to_be16(1), + } + }; + + struct resb { + struct hv_24x7_data_result_buffer buf; + struct hv_24x7_result res; + struct hv_24x7_result_element elem; + __be64 result; + } __packed __aligned(4096) result_buffer = {}; + + ret = plpar_hcall_norets(H_GET_24X7_DATA, + virt_to_phys(&request_buffer), sizeof(request_buffer), + virt_to_phys(&result_buffer), sizeof(result_buffer)); + + if (ret) { + if (success_expected) + pr_err_ratelimited("hcall failed: %d %#x %#x %d => 0x%lx (%ld) detail=0x%x failing ix=%x\n", + domain, offset, ix, lpar, + ret, ret, + result_buffer.buf.detailed_rc, + result_buffer.buf.failing_request_ix); + return ret; + } + + *res = be64_to_cpu(result_buffer.result); + return ret; +} + +static unsigned long event_24x7_request(struct perf_event *event, u64 *res, + bool success_expected) +{ + return single_24x7_request(event_get_domain(event), + event_get_offset(event), + event_get_starting_index(event), + event_get_lpar(event), + res, + success_expected); +} + +static int h_24x7_event_init(struct perf_event *event) +{ + struct hv_perf_caps caps; + unsigned domain; + unsigned long hret; + u64 ct; + + /* Not our event */ + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* Unused areas must be 0 */ + if (event_get_reserved1(event) || + event_get_reserved2(event) || + event_get_reserved3(event)) { + pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n", + event->attr.config, + event_get_reserved1(event), + event->attr.config1, + event_get_reserved2(event), + event->attr.config2, + event_get_reserved3(event)); + return -EINVAL; + } + + /* unsupported modes and filters */ + if (event->attr.exclude_user || + event->attr.exclude_kernel || + event->attr.exclude_hv || + event->attr.exclude_idle || + event->attr.exclude_host || + event->attr.exclude_guest || + is_sampling_event(event)) /* no sampling */ + return -EINVAL; + + /* no branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + + /* offset must be 8 byte aligned */ + if (event_get_offset(event) % 8) { + pr_devel("bad alignment\n"); + return -EINVAL; + } + + /* Domains above 6 are invalid */ + domain = event_get_domain(event); + if (domain > 6) { + pr_devel("invalid domain %d\n", domain); + return -EINVAL; + } + + hret = hv_perf_caps_get(&caps); + if (hret) { + pr_devel("could not get capabilities: rc=%ld\n", hret); + return -EIO; + } + + /* PHYSICAL domains & other lpars require extra capabilities */ + if (!caps.collect_privileged && (is_physical_domain(domain) || + (event_get_lpar(event) != event_get_lpar_max()))) { + pr_devel("hv permisions disallow: is_physical_domain:%d, lpar=0x%llx\n", + is_physical_domain(domain), + event_get_lpar(event)); + return -EACCES; + } + + /* see if the event complains */ + if (event_24x7_request(event, &ct, false)) { + pr_devel("test hcall failed\n"); + return -EIO; + } + + return 0; +} + +static u64 h_24x7_get_value(struct perf_event *event) +{ + unsigned long ret; + u64 ct; + ret = event_24x7_request(event, &ct, true); + if (ret) + /* We checked this in event init, shouldn't fail here... */ + return 0; + + return ct; +} + +static void h_24x7_event_update(struct perf_event *event) +{ + s64 prev; + u64 now; + now = h_24x7_get_value(event); + prev = local64_xchg(&event->hw.prev_count, now); + local64_add(now - prev, &event->count); +} + +static void h_24x7_event_start(struct perf_event *event, int flags) +{ + if (flags & PERF_EF_RELOAD) + local64_set(&event->hw.prev_count, h_24x7_get_value(event)); +} + +static void h_24x7_event_stop(struct perf_event *event, int flags) +{ + h_24x7_event_update(event); +} + +static int h_24x7_event_add(struct perf_event *event, int flags) +{ + if (flags & PERF_EF_START) + h_24x7_event_start(event, flags); + + return 0; +} + +static int h_24x7_event_idx(struct perf_event *event) +{ + return 0; +} + +static struct pmu h_24x7_pmu = { + .task_ctx_nr = perf_invalid_context, + + .name = "hv_24x7", + .attr_groups = attr_groups, + .event_init = h_24x7_event_init, + .add = h_24x7_event_add, + .del = h_24x7_event_stop, + .start = h_24x7_event_start, + .stop = h_24x7_event_stop, + .read = h_24x7_event_update, + .event_idx = h_24x7_event_idx, +}; + +static int hv_24x7_init(void) +{ + int r; + unsigned long hret; + struct hv_perf_caps caps; + + if (!firmware_has_feature(FW_FEATURE_LPAR)) { + pr_info("not a virtualized system, not enabling\n"); + return -ENODEV; + } + + hret = hv_perf_caps_get(&caps); + if (hret) { + pr_info("could not obtain capabilities, error 0x%80lx, not enabling\n", + hret); + return -ENODEV; + } + + hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL); + if (!hv_page_cache) + return -ENOMEM; + + r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1); + if (r) + return r; + + return 0; +} + +device_initcall(hv_24x7_init); diff --git a/arch/powerpc/perf/hv-24x7.h b/arch/powerpc/perf/hv-24x7.h new file mode 100644 index 0000000..720ebce --- /dev/null +++ b/arch/powerpc/perf/hv-24x7.h @@ -0,0 +1,109 @@ +#ifndef LINUX_POWERPC_PERF_HV_24X7_H_ +#define LINUX_POWERPC_PERF_HV_24X7_H_ + +#include <linux/types.h> + +struct hv_24x7_request { + /* PHYSICAL domains require enabling via phyp/hmc. */ +#define HV_24X7_PERF_DOMAIN_PHYSICAL_CHIP 0x01 +#define HV_24X7_PERF_DOMAIN_PHYSICAL_CORE 0x02 +#define HV_24X7_PERF_DOMAIN_VIRTUAL_PROCESSOR_HOME_CORE 0x03 +#define HV_24X7_PERF_DOMAIN_VIRTUAL_PROCESSOR_HOME_CHIP 0x04 +#define HV_24X7_PERF_DOMAIN_VIRTUAL_PROCESSOR_HOME_NODE 0x05 +#define HV_24X7_PERF_DOMAIN_VIRTUAL_PROCESSOR_REMOTE_NODE 0x06 + __u8 performance_domain; + __u8 reserved[0x1]; + + /* bytes to read starting at @data_offset. must be a multiple of 8 */ + __be16 data_size; + + /* + * byte offset within the perf domain to read from. must be 8 byte + * aligned + */ + __be32 data_offset; + + /* + * only valid for VIRTUAL_PROCESSOR domains, ignored for others. + * -1 means "current partition only" + * Enabling via phyp/hmc required for non-"-1" values. 0 forbidden + * unless requestor is 0. + */ + __be16 starting_lpar_ix; + + /* + * Ignored when @starting_lpar_ix == -1 + * Ignored when @performance_domain is not VIRTUAL_PROCESSOR_* + * -1 means "infinite" or all + */ + __be16 max_num_lpars; + + /* chip, core, or virtual processor based on @performance_domain */ + __be16 starting_ix; + __be16 max_ix; +} __packed; + +struct hv_24x7_request_buffer { + /* 0 - ? */ + /* 1 - ? */ +#define HV_24X7_IF_VERSION_CURRENT 0x01 + __u8 interface_version; + __u8 num_requests; + __u8 reserved[0xE]; + struct hv_24x7_request requests[]; +} __packed; + +struct hv_24x7_result_element { + __be16 lpar_ix; + + /* + * represents the core, chip, or virtual processor based on the + * request's @performance_domain + */ + __be16 domain_ix; + + /* -1 if @performance_domain does not refer to a virtual processor */ + __be32 lpar_cfg_instance_id; + + /* size = @result_element_data_size of cointaining result. */ + __u8 element_data[]; +} __packed; + +struct hv_24x7_result { + __u8 result_ix; + + /* + * 0 = not all result elements fit into the buffer, additional requests + * required + * 1 = all result elements were returned + */ + __u8 results_complete; + __be16 num_elements_returned; + + /* This is a copy of @data_size from the coresponding hv_24x7_request */ + __be16 result_element_data_size; + __u8 reserved[0x2]; + + /* WARNING: only valid for first result element due to variable sizes + * of result elements */ + /* struct hv_24x7_result_element[@num_elements_returned] */ + struct hv_24x7_result_element elements[]; +} __packed; + +struct hv_24x7_data_result_buffer { + /* See versioning for request buffer */ + __u8 interface_version; + + __u8 num_results; + __u8 reserved[0x1]; + __u8 failing_request_ix; + __be32 detailed_rc; + __be64 cec_cfg_instance_id; + __be64 catalog_version_num; + __u8 reserved2[0x8]; + /* WARNING: only valid for the first result due to variable sizes of + * results */ + struct hv_24x7_result results[]; /* [@num_results] */ +} __packed; + +#endif diff --git a/arch/powerpc/perf/hv-common.c b/arch/powerpc/perf/hv-common.c new file mode 100644 index 0000000..47e02b3 --- /dev/null +++ b/arch/powerpc/perf/hv-common.c @@ -0,0 +1,39 @@ +#include <asm/io.h> +#include <asm/hvcall.h> + +#include "hv-gpci.h" +#include "hv-common.h" + +unsigned long hv_perf_caps_get(struct hv_perf_caps *caps) +{ + unsigned long r; + struct p { + struct hv_get_perf_counter_info_params params; + struct cv_system_performance_capabilities caps; + } __packed __aligned(sizeof(uint64_t)); + + struct p arg = { + .params = { + .counter_request = cpu_to_be32( + CIR_SYSTEM_PERFORMANCE_CAPABILITIES), + .starting_index = cpu_to_be32(-1), + .counter_info_version_in = 0, + } + }; + + r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, + virt_to_phys(&arg), sizeof(arg)); + + if (r) + return r; + + pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask); + + caps->version = arg.params.counter_info_version_out; + caps->collect_privileged = !!arg.caps.perf_collect_privileged; + caps->ga = !!(arg.caps.capability_mask & CV_CM_GA); + caps->expanded = !!(arg.caps.capability_mask & CV_CM_EXPANDED); + caps->lab = !!(arg.caps.capability_mask & CV_CM_LAB); + + return r; +} diff --git a/arch/powerpc/perf/hv-common.h b/arch/powerpc/perf/hv-common.h new file mode 100644 index 0000000..5d79cec --- /dev/null +++ b/arch/powerpc/perf/hv-common.h @@ -0,0 +1,36 @@ +#ifndef LINUX_POWERPC_PERF_HV_COMMON_H_ +#define LINUX_POWERPC_PERF_HV_COMMON_H_ + +#include <linux/perf_event.h> +#include <linux/types.h> + +struct hv_perf_caps { + u16 version; + u16 collect_privileged:1, + ga:1, + expanded:1, + lab:1, + unused:12; +}; + +unsigned long hv_perf_caps_get(struct hv_perf_caps *caps); + + +#define EVENT_DEFINE_RANGE_FORMAT(name, attr_var, bit_start, bit_end) \ +PMU_FORMAT_ATTR(name, #attr_var ":" #bit_start "-" #bit_end); \ +EVENT_DEFINE_RANGE(name, attr_var, bit_start, bit_end) + +#define EVENT_DEFINE_RANGE(name, attr_var, bit_start, bit_end) \ +static u64 event_get_##name##_max(void) \ +{ \ + BUILD_BUG_ON((bit_start > bit_end) \ + || (bit_end >= (sizeof(1ull) * 8))); \ + return (((1ull << (bit_end - bit_start)) - 1) << 1) + 1; \ +} \ +static u64 event_get_##name(struct perf_event *event) \ +{ \ + return (event->attr.attr_var >> (bit_start)) & \ + event_get_##name##_max(); \ +} + +#endif diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c new file mode 100644 index 0000000..278ba7b --- /dev/null +++ b/arch/powerpc/perf/hv-gpci.c @@ -0,0 +1,294 @@ +/* + * Hypervisor supplied "gpci" ("get performance counter info") performance + * counter support + * + * Author: Cody P Schafer <cody@linux.vnet.ibm.com> + * Copyright 2014 IBM Corporation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#define pr_fmt(fmt) "hv-gpci: " fmt + +#include <linux/init.h> +#include <linux/perf_event.h> +#include <asm/firmware.h> +#include <asm/hvcall.h> +#include <asm/io.h> + +#include "hv-gpci.h" +#include "hv-common.h" + +/* + * Example usage: + * perf stat -e 'hv_gpci/counter_info_version=3,offset=0,length=8, + * secondary_index=0,starting_index=0xffffffff,request=0x10/' ... + */ + +/* u32 */ +EVENT_DEFINE_RANGE_FORMAT(request, config, 0, 31); +/* u32 */ +EVENT_DEFINE_RANGE_FORMAT(starting_index, config, 32, 63); +/* u16 */ +EVENT_DEFINE_RANGE_FORMAT(secondary_index, config1, 0, 15); +/* u8 */ +EVENT_DEFINE_RANGE_FORMAT(counter_info_version, config1, 16, 23); +/* u8, bytes of data (1-8) */ +EVENT_DEFINE_RANGE_FORMAT(length, config1, 24, 31); +/* u32, byte offset */ +EVENT_DEFINE_RANGE_FORMAT(offset, config1, 32, 63); + +static struct attribute *format_attrs[] = { + &format_attr_request.attr, + &format_attr_starting_index.attr, + &format_attr_secondary_index.attr, + &format_attr_counter_info_version.attr, + + &format_attr_offset.attr, + &format_attr_length.attr, + NULL, +}; + +static struct attribute_group format_group = { + .name = "format", + .attrs = format_attrs, +}; + +#define HV_CAPS_ATTR(_name, _format) \ +static ssize_t _name##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *page) \ +{ \ + struct hv_perf_caps caps; \ + unsigned long hret = hv_perf_caps_get(&caps); \ + if (hret) \ + return -EIO; \ + \ + return sprintf(page, _format, caps._name); \ +} \ +static struct device_attribute hv_caps_attr_##_name = __ATTR_RO(_name) + +static ssize_t kernel_version_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + return sprintf(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT); +} + +DEVICE_ATTR_RO(kernel_version); +HV_CAPS_ATTR(version, "0x%x\n"); +HV_CAPS_ATTR(ga, "%d\n"); +HV_CAPS_ATTR(expanded, "%d\n"); +HV_CAPS_ATTR(lab, "%d\n"); +HV_CAPS_ATTR(collect_privileged, "%d\n"); + +static struct attribute *interface_attrs[] = { + &dev_attr_kernel_version.attr, + &hv_caps_attr_version.attr, + &hv_caps_attr_ga.attr, + &hv_caps_attr_expanded.attr, + &hv_caps_attr_lab.attr, + &hv_caps_attr_collect_privileged.attr, + NULL, +}; + +static struct attribute_group interface_group = { + .name = "interface", + .attrs = interface_attrs, +}; + +static const struct attribute_group *attr_groups[] = { + &format_group, + &interface_group, + NULL, +}; + +#define GPCI_MAX_DATA_BYTES \ + (1024 - sizeof(struct hv_get_perf_counter_info_params)) + +static unsigned long single_gpci_request(u32 req, u32 starting_index, + u16 secondary_index, u8 version_in, u32 offset, u8 length, + u64 *value) +{ + unsigned long ret; + size_t i; + u64 count; + + struct { + struct hv_get_perf_counter_info_params params; + uint8_t bytes[GPCI_MAX_DATA_BYTES]; + } __packed __aligned(sizeof(uint64_t)) arg = { + .params = { + .counter_request = cpu_to_be32(req), + .starting_index = cpu_to_be32(starting_index), + .secondary_index = cpu_to_be16(secondary_index), + .counter_info_version_in = version_in, + } + }; + + ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, + virt_to_phys(&arg), sizeof(arg)); + if (ret) { + pr_devel("hcall failed: 0x%lx\n", ret); + return ret; + } + + /* + * we verify offset and length are within the zeroed buffer at event + * init. + */ + count = 0; + for (i = offset; i < offset + length; i++) + count |= arg.bytes[i] << (i - offset); + + *value = count; + return ret; +} + +static u64 h_gpci_get_value(struct perf_event *event) +{ + u64 count; + unsigned long ret = single_gpci_request(event_get_request(event), + event_get_starting_index(event), + event_get_secondary_index(event), + event_get_counter_info_version(event), + event_get_offset(event), + event_get_length(event), + &count); + if (ret) + return 0; + return count; +} + +static void h_gpci_event_update(struct perf_event *event) +{ + s64 prev; + u64 now = h_gpci_get_value(event); + prev = local64_xchg(&event->hw.prev_count, now); + local64_add(now - prev, &event->count); +} + +static void h_gpci_event_start(struct perf_event *event, int flags) +{ + local64_set(&event->hw.prev_count, h_gpci_get_value(event)); +} + +static void h_gpci_event_stop(struct perf_event *event, int flags) +{ + h_gpci_event_update(event); +} + +static int h_gpci_event_add(struct perf_event *event, int flags) +{ + if (flags & PERF_EF_START) + h_gpci_event_start(event, flags); + + return 0; +} + +static int h_gpci_event_init(struct perf_event *event) +{ + u64 count; + u8 length; + + /* Not our event */ + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* config2 is unused */ + if (event->attr.config2) { + pr_devel("config2 set when reserved\n"); + return -EINVAL; + } + + /* unsupported modes and filters */ + if (event->attr.exclude_user || + event->attr.exclude_kernel || + event->attr.exclude_hv || + event->attr.exclude_idle || + event->attr.exclude_host || + event->attr.exclude_guest || + is_sampling_event(event)) /* no sampling */ + return -EINVAL; + + /* no branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + + length = event_get_length(event); + if (length < 1 || length > 8) { + pr_devel("length invalid\n"); + return -EINVAL; + } + + /* last byte within the buffer? */ + if ((event_get_offset(event) + length) > GPCI_MAX_DATA_BYTES) { + pr_devel("request outside of buffer: %zu > %zu\n", + (size_t)event_get_offset(event) + length, + GPCI_MAX_DATA_BYTES); + return -EINVAL; + } + + /* check if the request works... */ + if (single_gpci_request(event_get_request(event), + event_get_starting_index(event), + event_get_secondary_index(event), + event_get_counter_info_version(event), + event_get_offset(event), + length, + &count)) { + pr_devel("gpci hcall failed\n"); + return -EINVAL; + } + + return 0; +} + +static int h_gpci_event_idx(struct perf_event *event) +{ + return 0; +} + +static struct pmu h_gpci_pmu = { + .task_ctx_nr = perf_invalid_context, + + .name = "hv_gpci", + .attr_groups = attr_groups, + .event_init = h_gpci_event_init, + .add = h_gpci_event_add, + .del = h_gpci_event_stop, + .start = h_gpci_event_start, + .stop = h_gpci_event_stop, + .read = h_gpci_event_update, + .event_idx = h_gpci_event_idx, +}; + +static int hv_gpci_init(void) +{ + int r; + unsigned long hret; + struct hv_perf_caps caps; + + if (!firmware_has_feature(FW_FEATURE_LPAR)) { + pr_info("not a virtualized system, not enabling\n"); + return -ENODEV; + } + + hret = hv_perf_caps_get(&caps); + if (hret) { + pr_info("could not obtain capabilities, error 0x%80lx, not enabling\n", + hret); + return -ENODEV; + } + + r = perf_pmu_register(&h_gpci_pmu, h_gpci_pmu.name, -1); + if (r) + return r; + + return 0; +} + +device_initcall(hv_gpci_init); diff --git a/arch/powerpc/perf/hv-gpci.h b/arch/powerpc/perf/hv-gpci.h new file mode 100644 index 0000000..b25f460 --- /dev/null +++ b/arch/powerpc/perf/hv-gpci.h @@ -0,0 +1,73 @@ +#ifndef LINUX_POWERPC_PERF_HV_GPCI_H_ +#define LINUX_POWERPC_PERF_HV_GPCI_H_ + +#include <linux/types.h> + +/* From the document "H_GetPerformanceCounterInfo Interface" v1.07 */ + +/* H_GET_PERF_COUNTER_INFO argument */ +struct hv_get_perf_counter_info_params { + __be32 counter_request; /* I */ + __be32 starting_index; /* IO */ + __be16 secondary_index; /* IO */ + __be16 returned_values; /* O */ + __be32 detail_rc; /* O, only needed when called via *_norets() */ + + /* + * O, size each of counter_value element in bytes, only set for version + * >= 0x3 + */ + __be16 cv_element_size; + + /* I, 0 (zero) for versions < 0x3 */ + __u8 counter_info_version_in; + + /* O, 0 (zero) if version < 0x3. Must be set to 0 when making hcall */ + __u8 counter_info_version_out; + __u8 reserved[0xC]; + __u8 counter_value[]; +} __packed; + +/* + * counter info version => fw version/reference (spec version) + * + * 8 => power8 (1.07) + * [7 is skipped by spec 1.07] + * 6 => TLBIE (1.07) + * 5 => v7r7m0.phyp (1.05) + * [4 skipped] + * 3 => v7r6m0.phyp (?) + * [1,2 skipped] + * 0 => v7r{2,3,4}m0.phyp (?) + */ +#define COUNTER_INFO_VERSION_CURRENT 0x8 + +/* + * These determine the counter_value[] layout and the meaning of starting_index + * and secondary_index. + * + * Unless otherwise noted, @secondary_index is unused and ignored. + */ +enum counter_info_requests { + + /* GENERAL */ + + /* @starting_index: must be -1 (to refer to the current partition) + */ + CIR_SYSTEM_PERFORMANCE_CAPABILITIES = 0X40, +}; + +struct cv_system_performance_capabilities { + /* If != 0, allowed to collect data from other partitions */ + __u8 perf_collect_privileged; + + /* These following are only valid if counter_info_version >= 0x3 */ +#define CV_CM_GA (1 << 7) +#define CV_CM_EXPANDED (1 << 6) +#define CV_CM_LAB (1 << 5) + /* remaining bits are reserved */ + __u8 capability_mask; + __u8 reserved[0xE]; +} __packed; + +#endif diff --git a/arch/powerpc/perf/power7-events-list.h b/arch/powerpc/perf/power7-events-list.h index 687790a..64f13d9 100644 --- a/arch/powerpc/perf/power7-events-list.h +++ b/arch/powerpc/perf/power7-events-list.h @@ -546,3 +546,13 @@ EVENT(PM_MRK_DATA_FROM_RL2L3_SHR, 0x1d04c) EVENT(PM_DTLB_MISS_16M, 0x4c05e) EVENT(PM_LSU1_LMQ_LHR_MERGE, 0x0d09a) EVENT(PM_IFU_FIN, 0x40066) +EVENT(PM_1THRD_CON_RUN_INSTR, 0x30062) +EVENT(PM_CMPLU_STALL_COUNT, 0x4000B) +EVENT(PM_MEM0_PB_RD_CL, 0x30083) +EVENT(PM_THRD_1_RUN_CYC, 0x10060) +EVENT(PM_THRD_2_CONC_RUN_INSTR, 0x40062) +EVENT(PM_THRD_2_RUN_CYC, 0x20060) +EVENT(PM_THRD_3_CONC_RUN_INST, 0x10062) +EVENT(PM_THRD_3_RUN_CYC, 0x30060) +EVENT(PM_THRD_4_CONC_RUN_INST, 0x20062) +EVENT(PM_THRD_4_RUN_CYC, 0x40060) diff --git a/arch/powerpc/perf/power8-pmu.c b/arch/powerpc/perf/power8-pmu.c index 96cee20..fe2763b 100644 --- a/arch/powerpc/perf/power8-pmu.c +++ b/arch/powerpc/perf/power8-pmu.c @@ -10,6 +10,8 @@ * 2 of the License, or (at your option) any later version. */ +#define pr_fmt(fmt) "power8-pmu: " fmt + #include <linux/kernel.h> #include <linux/perf_event.h> #include <asm/firmware.h> @@ -62,9 +64,11 @@ * * 60 56 52 48 44 40 36 32 * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - * | [ thresh_cmp ] [ thresh_ctl ] - * | | - * *- EBB (Linux) thresh start/stop OR FAB match -* + * | | [ ] [ thresh_cmp ] [ thresh_ctl ] + * | | | | + * | | *- IFM (Linux) thresh start/stop OR FAB match -* + * | *- BHRB (Linux) + * *- EBB (Linux) * * 28 24 20 16 12 8 4 0 * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | @@ -114,9 +118,18 @@ * MMCRA[57:59] = sample[0:2] (RAND_SAMP_ELIG) * MMCRA[61:62] = sample[3:4] (RAND_SAMP_MODE) * + * if EBB and BHRB: + * MMCRA[32:33] = IFM + * */ #define EVENT_EBB_MASK 1ull +#define EVENT_EBB_SHIFT PERF_EVENT_CONFIG_EBB_SHIFT +#define EVENT_BHRB_MASK 1ull +#define EVENT_BHRB_SHIFT 62 +#define EVENT_WANTS_BHRB (EVENT_BHRB_MASK << EVENT_BHRB_SHIFT) +#define EVENT_IFM_MASK 3ull +#define EVENT_IFM_SHIFT 60 #define EVENT_THR_CMP_SHIFT 40 /* Threshold CMP value */ #define EVENT_THR_CMP_MASK 0x3ff #define EVENT_THR_CTL_SHIFT 32 /* Threshold control value (start/stop) */ @@ -141,6 +154,12 @@ #define EVENT_IS_MARKED (EVENT_MARKED_MASK << EVENT_MARKED_SHIFT) #define EVENT_PSEL_MASK 0xff /* PMCxSEL value */ +/* Bits defined by Linux */ +#define EVENT_LINUX_MASK \ + ((EVENT_EBB_MASK << EVENT_EBB_SHIFT) | \ + (EVENT_BHRB_MASK << EVENT_BHRB_SHIFT) | \ + (EVENT_IFM_MASK << EVENT_IFM_SHIFT)) + #define EVENT_VALID_MASK \ ((EVENT_THRESH_MASK << EVENT_THRESH_SHIFT) | \ (EVENT_SAMPLE_MASK << EVENT_SAMPLE_SHIFT) | \ @@ -149,7 +168,7 @@ (EVENT_UNIT_MASK << EVENT_UNIT_SHIFT) | \ (EVENT_COMBINE_MASK << EVENT_COMBINE_SHIFT) | \ (EVENT_MARKED_MASK << EVENT_MARKED_SHIFT) | \ - (EVENT_EBB_MASK << PERF_EVENT_CONFIG_EBB_SHIFT) | \ + EVENT_LINUX_MASK | \ EVENT_PSEL_MASK) /* MMCRA IFM bits - POWER8 */ @@ -173,10 +192,11 @@ * * 28 24 20 16 12 8 4 0 * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - * | [ ] [ sample ] [ ] [6] [5] [4] [3] [2] [1] - * EBB -* | | - * | | Count of events for each PMC. - * L1 I/D qualifier -* | p1, p2, p3, p4, p5, p6. + * [ ] | [ ] [ sample ] [ ] [6] [5] [4] [3] [2] [1] + * | | | | + * BHRB IFM -* | | | Count of events for each PMC. + * EBB -* | | p1, p2, p3, p4, p5, p6. + * L1 I/D qualifier -* | * nc - number of counters -* * * The PMC fields P1..P6, and NC, are adder fields. As we accumulate constraints @@ -195,6 +215,9 @@ #define CNST_EBB_VAL(v) (((v) & EVENT_EBB_MASK) << 24) #define CNST_EBB_MASK CNST_EBB_VAL(EVENT_EBB_MASK) +#define CNST_IFM_VAL(v) (((v) & EVENT_IFM_MASK) << 25) +#define CNST_IFM_MASK CNST_IFM_VAL(EVENT_IFM_MASK) + #define CNST_L1_QUAL_VAL(v) (((v) & 3) << 22) #define CNST_L1_QUAL_MASK CNST_L1_QUAL_VAL(3) @@ -241,6 +264,7 @@ #define MMCRA_THR_SEL_SHIFT 16 #define MMCRA_THR_CMP_SHIFT 32 #define MMCRA_SDAR_MODE_TLB (1ull << 42) +#define MMCRA_IFM_SHIFT 30 static inline bool event_is_fab_match(u64 event) @@ -265,20 +289,22 @@ static int power8_get_constraint(u64 event, unsigned long *maskp, unsigned long pmc = (event >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK; unit = (event >> EVENT_UNIT_SHIFT) & EVENT_UNIT_MASK; cache = (event >> EVENT_CACHE_SEL_SHIFT) & EVENT_CACHE_SEL_MASK; - ebb = (event >> PERF_EVENT_CONFIG_EBB_SHIFT) & EVENT_EBB_MASK; - - /* Clear the EBB bit in the event, so event checks work below */ - event &= ~(EVENT_EBB_MASK << PERF_EVENT_CONFIG_EBB_SHIFT); + ebb = (event >> EVENT_EBB_SHIFT) & EVENT_EBB_MASK; if (pmc) { + u64 base_event; + if (pmc > 6) return -1; - mask |= CNST_PMC_MASK(pmc); - value |= CNST_PMC_VAL(pmc); + /* Ignore Linux defined bits when checking event below */ + base_event = event & ~EVENT_LINUX_MASK; - if (pmc >= 5 && event != 0x500fa && event != 0x600f4) + if (pmc >= 5 && base_event != 0x500fa && base_event != 0x600f4) return -1; + + mask |= CNST_PMC_MASK(pmc); + value |= CNST_PMC_VAL(pmc); } if (pmc <= 4) { @@ -299,9 +325,10 @@ static int power8_get_constraint(u64 event, unsigned long *maskp, unsigned long * HV writable, and there is no API for guest kernels to modify * it. The solution is for the hypervisor to initialise the * field to zeroes, and for us to only ever allow events that - * have a cache selector of zero. + * have a cache selector of zero. The bank selector (bit 3) is + * irrelevant, as long as the rest of the value is 0. */ - if (cache) + if (cache & 0x7) return -1; } else if (event & EVENT_IS_L1) { @@ -342,6 +369,15 @@ static int power8_get_constraint(u64 event, unsigned long *maskp, unsigned long /* EBB events must specify the PMC */ return -1; + if (event & EVENT_WANTS_BHRB) { + if (!ebb) + /* Only EBB events can request BHRB */ + return -1; + + mask |= CNST_IFM_MASK; + value |= CNST_IFM_VAL(event >> EVENT_IFM_SHIFT); + } + /* * All events must agree on EBB, either all request it or none. * EBB events are pinned & exclusive, so this should never actually @@ -431,6 +467,11 @@ static int power8_compute_mmcr(u64 event[], int n_ev, mmcra |= val << MMCRA_THR_CMP_SHIFT; } + if (event[i] & EVENT_WANTS_BHRB) { + val = (event[i] >> EVENT_IFM_SHIFT) & EVENT_IFM_MASK; + mmcra |= val << MMCRA_IFM_SHIFT; + } + hwc[i] = pmc - 1; } @@ -774,6 +815,9 @@ static int __init init_power8_pmu(void) /* Tell userspace that EBB is supported */ cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB; + if (cpu_has_feature(CPU_FTR_PMAO_BUG)) + pr_info("PMAO restore workaround active.\n"); + return 0; } early_initcall(init_power8_pmu); |
