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linux/drivers/perf/cxl_pmu.c
Hojin Nam 802379b8f9 perf: CXL: fix CPMU filter value mask length 
CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
However, it is used as 2B length in code and comments.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Hojin Nam <hj96.nam@samsung.com>
Link: https://lore.kernel.org/r/20240216014522.32321-1-hj96.nam@samsung.com
Signed-off-by: Will Deacon <will@kernel.org>
2024-02-20 12:04:07 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2023 Huawei
*
* The CXL 3.0 specification includes a standard Performance Monitoring Unit,
* called the CXL PMU, or CPMU. In order to allow a high degree of
* implementation flexibility the specification provides a wide range of
* options all of which are self describing.
*
* Details in CXL rev 3.0 section 8.2.7 CPMU Register Interface
*/
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/perf_event.h>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/bits.h>
#include <linux/list.h>
#include <linux/bug.h>
#include <linux/pci.h>
#include "../cxl/cxlpci.h"
#include "../cxl/cxl.h"
#include "../cxl/pmu.h"
#define CXL_PMU_CAP_REG 0x0
#define CXL_PMU_CAP_NUM_COUNTERS_MSK GENMASK_ULL(5, 0)
#define CXL_PMU_CAP_COUNTER_WIDTH_MSK GENMASK_ULL(15, 8)
#define CXL_PMU_CAP_NUM_EVN_CAP_REG_SUP_MSK GENMASK_ULL(24, 20)
#define CXL_PMU_CAP_FILTERS_SUP_MSK GENMASK_ULL(39, 32)
#define CXL_PMU_FILTER_HDM BIT(0)
#define CXL_PMU_FILTER_CHAN_RANK_BANK BIT(1)
#define CXL_PMU_CAP_MSI_N_MSK GENMASK_ULL(47, 44)
#define CXL_PMU_CAP_WRITEABLE_WHEN_FROZEN BIT_ULL(48)
#define CXL_PMU_CAP_FREEZE BIT_ULL(49)
#define CXL_PMU_CAP_INT BIT_ULL(50)
#define CXL_PMU_CAP_VERSION_MSK GENMASK_ULL(63, 60)
#define CXL_PMU_OVERFLOW_REG 0x10
#define CXL_PMU_FREEZE_REG 0x18
#define CXL_PMU_EVENT_CAP_REG(n) (0x100 + 8 * (n))
#define CXL_PMU_EVENT_CAP_SUPPORTED_EVENTS_MSK GENMASK_ULL(31, 0)
#define CXL_PMU_EVENT_CAP_GROUP_ID_MSK GENMASK_ULL(47, 32)
#define CXL_PMU_EVENT_CAP_VENDOR_ID_MSK GENMASK_ULL(63, 48)
#define CXL_PMU_COUNTER_CFG_REG(n) (0x200 + 8 * (n))
#define CXL_PMU_COUNTER_CFG_TYPE_MSK GENMASK_ULL(1, 0)
#define CXL_PMU_COUNTER_CFG_TYPE_FREE_RUN 0
#define CXL_PMU_COUNTER_CFG_TYPE_FIXED_FUN 1
#define CXL_PMU_COUNTER_CFG_TYPE_CONFIGURABLE 2
#define CXL_PMU_COUNTER_CFG_ENABLE BIT_ULL(8)
#define CXL_PMU_COUNTER_CFG_INT_ON_OVRFLW BIT_ULL(9)
#define CXL_PMU_COUNTER_CFG_FREEZE_ON_OVRFLW BIT_ULL(10)
#define CXL_PMU_COUNTER_CFG_EDGE BIT_ULL(11)
#define CXL_PMU_COUNTER_CFG_INVERT BIT_ULL(12)
#define CXL_PMU_COUNTER_CFG_THRESHOLD_MSK GENMASK_ULL(23, 16)
#define CXL_PMU_COUNTER_CFG_EVENTS_MSK GENMASK_ULL(55, 24)
#define CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK GENMASK_ULL(63, 59)
#define CXL_PMU_FILTER_CFG_REG(n, f) (0x400 + 4 * ((f) + (n) * 8))
#define CXL_PMU_FILTER_CFG_VALUE_MSK GENMASK(31, 0)
#define CXL_PMU_COUNTER_REG(n) (0xc00 + 8 * (n))
/* CXL rev 3.0 Table 13-5 Events under CXL Vendor ID */
#define CXL_PMU_GID_CLOCK_TICKS 0x00
#define CXL_PMU_GID_D2H_REQ 0x0010
#define CXL_PMU_GID_D2H_RSP 0x0011
#define CXL_PMU_GID_H2D_REQ 0x0012
#define CXL_PMU_GID_H2D_RSP 0x0013
#define CXL_PMU_GID_CACHE_DATA 0x0014
#define CXL_PMU_GID_M2S_REQ 0x0020
#define CXL_PMU_GID_M2S_RWD 0x0021
#define CXL_PMU_GID_M2S_BIRSP 0x0022
#define CXL_PMU_GID_S2M_BISNP 0x0023
#define CXL_PMU_GID_S2M_NDR 0x0024
#define CXL_PMU_GID_S2M_DRS 0x0025
#define CXL_PMU_GID_DDR 0x8000
static int cxl_pmu_cpuhp_state_num;
struct cxl_pmu_ev_cap {
u16 vid;
u16 gid;
u32 msk;
union {
int counter_idx; /* fixed counters */
int event_idx; /* configurable counters */
};
struct list_head node;
};
#define CXL_PMU_MAX_COUNTERS 64
struct cxl_pmu_info {
struct pmu pmu;
void __iomem *base;
struct perf_event **hw_events;
struct list_head event_caps_configurable;
struct list_head event_caps_fixed;
DECLARE_BITMAP(used_counter_bm, CXL_PMU_MAX_COUNTERS);
DECLARE_BITMAP(conf_counter_bm, CXL_PMU_MAX_COUNTERS);
u16 counter_width;
u8 num_counters;
u8 num_event_capabilities;
int on_cpu;
struct hlist_node node;
bool filter_hdm;
int irq;
};
#define pmu_to_cxl_pmu_info(_pmu) container_of(_pmu, struct cxl_pmu_info, pmu)
/*
* All CPMU counters are discoverable via the Event Capabilities Registers.
* Each Event Capability register contains a a VID / GroupID.
* A counter may then count any combination (by summing) of events in
* that group which are in the Supported Events Bitmask.
* However, there are some complexities to the scheme.
* - Fixed function counters refer to an Event Capabilities register.
* That event capability register is not then used for Configurable
* counters.
*/
static int cxl_pmu_parse_caps(struct device *dev, struct cxl_pmu_info *info)
{
unsigned long fixed_counter_event_cap_bm = 0;
void __iomem *base = info->base;
bool freeze_for_enable;
u64 val, eval;
int i;
val = readq(base + CXL_PMU_CAP_REG);
freeze_for_enable = FIELD_GET(CXL_PMU_CAP_WRITEABLE_WHEN_FROZEN, val) &&
FIELD_GET(CXL_PMU_CAP_FREEZE, val);
if (!freeze_for_enable) {
dev_err(dev, "Counters not writable while frozen\n");
return -ENODEV;
}
info->num_counters = FIELD_GET(CXL_PMU_CAP_NUM_COUNTERS_MSK, val) + 1;
info->counter_width = FIELD_GET(CXL_PMU_CAP_COUNTER_WIDTH_MSK, val);
info->num_event_capabilities = FIELD_GET(CXL_PMU_CAP_NUM_EVN_CAP_REG_SUP_MSK, val) + 1;
info->filter_hdm = FIELD_GET(CXL_PMU_CAP_FILTERS_SUP_MSK, val) & CXL_PMU_FILTER_HDM;
if (FIELD_GET(CXL_PMU_CAP_INT, val))
info->irq = FIELD_GET(CXL_PMU_CAP_MSI_N_MSK, val);
else
info->irq = -1;
/* First handle fixed function counters; note if configurable counters found */
for (i = 0; i < info->num_counters; i++) {
struct cxl_pmu_ev_cap *pmu_ev;
u32 events_msk;
u8 group_idx;
val = readq(base + CXL_PMU_COUNTER_CFG_REG(i));
if (FIELD_GET(CXL_PMU_COUNTER_CFG_TYPE_MSK, val) ==
CXL_PMU_COUNTER_CFG_TYPE_CONFIGURABLE) {
set_bit(i, info->conf_counter_bm);
}
if (FIELD_GET(CXL_PMU_COUNTER_CFG_TYPE_MSK, val) !=
CXL_PMU_COUNTER_CFG_TYPE_FIXED_FUN)
continue;
/* In this case we know which fields are const */
group_idx = FIELD_GET(CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK, val);
events_msk = FIELD_GET(CXL_PMU_COUNTER_CFG_EVENTS_MSK, val);
eval = readq(base + CXL_PMU_EVENT_CAP_REG(group_idx));
pmu_ev = devm_kzalloc(dev, sizeof(*pmu_ev), GFP_KERNEL);
if (!pmu_ev)
return -ENOMEM;
pmu_ev->vid = FIELD_GET(CXL_PMU_EVENT_CAP_VENDOR_ID_MSK, eval);
pmu_ev->gid = FIELD_GET(CXL_PMU_EVENT_CAP_GROUP_ID_MSK, eval);
/* For a fixed purpose counter use the events mask from the counter CFG */
pmu_ev->msk = events_msk;
pmu_ev->counter_idx = i;
/* This list add is never unwound as all entries deleted on remove */
list_add(&pmu_ev->node, &info->event_caps_fixed);
/*
* Configurable counters must not use an Event Capability registers that
* is in use for a Fixed counter
*/
set_bit(group_idx, &fixed_counter_event_cap_bm);
}
if (!bitmap_empty(info->conf_counter_bm, CXL_PMU_MAX_COUNTERS)) {
struct cxl_pmu_ev_cap *pmu_ev;
int j;
/* Walk event capabilities unused by fixed counters */
for_each_clear_bit(j, &fixed_counter_event_cap_bm,
info->num_event_capabilities) {
pmu_ev = devm_kzalloc(dev, sizeof(*pmu_ev), GFP_KERNEL);
if (!pmu_ev)
return -ENOMEM;
eval = readq(base + CXL_PMU_EVENT_CAP_REG(j));
pmu_ev->vid = FIELD_GET(CXL_PMU_EVENT_CAP_VENDOR_ID_MSK, eval);
pmu_ev->gid = FIELD_GET(CXL_PMU_EVENT_CAP_GROUP_ID_MSK, eval);
pmu_ev->msk = FIELD_GET(CXL_PMU_EVENT_CAP_SUPPORTED_EVENTS_MSK, eval);
pmu_ev->event_idx = j;
list_add(&pmu_ev->node, &info->event_caps_configurable);
}
}
return 0;
}
static ssize_t cxl_pmu_format_sysfs_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_ext_attribute *eattr;
eattr = container_of(attr, struct dev_ext_attribute, attr);
return sysfs_emit(buf, "%s\n", (char *)eattr->var);
}
#define CXL_PMU_FORMAT_ATTR(_name, _format)\
(&((struct dev_ext_attribute[]) { \
{ \
.attr = __ATTR(_name, 0444, \
cxl_pmu_format_sysfs_show, NULL), \
.var = (void *)_format \
} \
})[0].attr.attr)
enum {
cxl_pmu_mask_attr,
cxl_pmu_gid_attr,
cxl_pmu_vid_attr,
cxl_pmu_threshold_attr,
cxl_pmu_invert_attr,
cxl_pmu_edge_attr,
cxl_pmu_hdm_filter_en_attr,
cxl_pmu_hdm_attr,
};
static struct attribute *cxl_pmu_format_attr[] = {
[cxl_pmu_mask_attr] = CXL_PMU_FORMAT_ATTR(mask, "config:0-31"),
[cxl_pmu_gid_attr] = CXL_PMU_FORMAT_ATTR(gid, "config:32-47"),
[cxl_pmu_vid_attr] = CXL_PMU_FORMAT_ATTR(vid, "config:48-63"),
[cxl_pmu_threshold_attr] = CXL_PMU_FORMAT_ATTR(threshold, "config1:0-15"),
[cxl_pmu_invert_attr] = CXL_PMU_FORMAT_ATTR(invert, "config1:16"),
[cxl_pmu_edge_attr] = CXL_PMU_FORMAT_ATTR(edge, "config1:17"),
[cxl_pmu_hdm_filter_en_attr] = CXL_PMU_FORMAT_ATTR(hdm_filter_en, "config1:18"),
[cxl_pmu_hdm_attr] = CXL_PMU_FORMAT_ATTR(hdm, "config2:0-15"),
NULL
};
#define CXL_PMU_ATTR_CONFIG_MASK_MSK GENMASK_ULL(31, 0)
#define CXL_PMU_ATTR_CONFIG_GID_MSK GENMASK_ULL(47, 32)
#define CXL_PMU_ATTR_CONFIG_VID_MSK GENMASK_ULL(63, 48)
#define CXL_PMU_ATTR_CONFIG1_THRESHOLD_MSK GENMASK_ULL(15, 0)
#define CXL_PMU_ATTR_CONFIG1_INVERT_MSK BIT(16)
#define CXL_PMU_ATTR_CONFIG1_EDGE_MSK BIT(17)
#define CXL_PMU_ATTR_CONFIG1_FILTER_EN_MSK BIT(18)
#define CXL_PMU_ATTR_CONFIG2_HDM_MSK GENMASK(15, 0)
static umode_t cxl_pmu_format_is_visible(struct kobject *kobj,
struct attribute *attr, int a)
{
struct device *dev = kobj_to_dev(kobj);
struct cxl_pmu_info *info = dev_get_drvdata(dev);
/*
* Filter capability at the CPMU level, so hide the attributes if the particular
* filter is not supported.
*/
if (!info->filter_hdm &&
(attr == cxl_pmu_format_attr[cxl_pmu_hdm_filter_en_attr] ||
attr == cxl_pmu_format_attr[cxl_pmu_hdm_attr]))
return 0;
return attr->mode;
}
static const struct attribute_group cxl_pmu_format_group = {
.name = "format",
.attrs = cxl_pmu_format_attr,
.is_visible = cxl_pmu_format_is_visible,
};
static u32 cxl_pmu_config_get_mask(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG_MASK_MSK, event->attr.config);
}
static u16 cxl_pmu_config_get_gid(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG_GID_MSK, event->attr.config);
}
static u16 cxl_pmu_config_get_vid(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG_VID_MSK, event->attr.config);
}
static u8 cxl_pmu_config1_get_threshold(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG1_THRESHOLD_MSK, event->attr.config1);
}
static bool cxl_pmu_config1_get_invert(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG1_INVERT_MSK, event->attr.config1);
}
static bool cxl_pmu_config1_get_edge(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG1_EDGE_MSK, event->attr.config1);
}
/*
* CPMU specification allows for 8 filters, each with a 32 bit value...
* So we need to find 8x32bits to store it in.
* As the value used for disable is 0xffff_ffff, a separate enable switch
* is needed.
*/
static bool cxl_pmu_config1_hdm_filter_en(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG1_FILTER_EN_MSK, event->attr.config1);
}
static u16 cxl_pmu_config2_get_hdm_decoder(struct perf_event *event)
{
return FIELD_GET(CXL_PMU_ATTR_CONFIG2_HDM_MSK, event->attr.config2);
}
static ssize_t cxl_pmu_event_sysfs_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct perf_pmu_events_attr *pmu_attr =
container_of(attr, struct perf_pmu_events_attr, attr);
return sysfs_emit(buf, "config=%#llx\n", pmu_attr->id);
}
#define CXL_PMU_EVENT_ATTR(_name, _vid, _gid, _msk) \
PMU_EVENT_ATTR_ID(_name, cxl_pmu_event_sysfs_show, \
((u64)(_vid) << 48) | ((u64)(_gid) << 32) | (u64)(_msk))
/* For CXL spec defined events */
#define CXL_PMU_EVENT_CXL_ATTR(_name, _gid, _msk) \
CXL_PMU_EVENT_ATTR(_name, PCI_DVSEC_VENDOR_ID_CXL, _gid, _msk)
static struct attribute *cxl_pmu_event_attrs[] = {
CXL_PMU_EVENT_CXL_ATTR(clock_ticks, CXL_PMU_GID_CLOCK_TICKS, BIT(0)),
/* CXL rev 3.0 Table 3-17 - Device to Host Requests */
CXL_PMU_EVENT_CXL_ATTR(d2h_req_rdcurr, CXL_PMU_GID_D2H_REQ, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_rdown, CXL_PMU_GID_D2H_REQ, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_rdshared, CXL_PMU_GID_D2H_REQ, BIT(3)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_rdany, CXL_PMU_GID_D2H_REQ, BIT(4)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_rdownnodata, CXL_PMU_GID_D2H_REQ, BIT(5)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_itomwr, CXL_PMU_GID_D2H_REQ, BIT(6)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_wrcurr, CXL_PMU_GID_D2H_REQ, BIT(7)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_clflush, CXL_PMU_GID_D2H_REQ, BIT(8)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_cleanevict, CXL_PMU_GID_D2H_REQ, BIT(9)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_dirtyevict, CXL_PMU_GID_D2H_REQ, BIT(10)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_cleanevictnodata, CXL_PMU_GID_D2H_REQ, BIT(11)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_wowrinv, CXL_PMU_GID_D2H_REQ, BIT(12)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_wowrinvf, CXL_PMU_GID_D2H_REQ, BIT(13)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_wrinv, CXL_PMU_GID_D2H_REQ, BIT(14)),
CXL_PMU_EVENT_CXL_ATTR(d2h_req_cacheflushed, CXL_PMU_GID_D2H_REQ, BIT(16)),
/* CXL rev 3.0 Table 3-20 - D2H Repsonse Encodings */
CXL_PMU_EVENT_CXL_ATTR(d2h_rsp_rspihiti, CXL_PMU_GID_D2H_RSP, BIT(4)),
CXL_PMU_EVENT_CXL_ATTR(d2h_rsp_rspvhitv, CXL_PMU_GID_D2H_RSP, BIT(6)),
CXL_PMU_EVENT_CXL_ATTR(d2h_rsp_rspihitse, CXL_PMU_GID_D2H_RSP, BIT(5)),
CXL_PMU_EVENT_CXL_ATTR(d2h_rsp_rspshitse, CXL_PMU_GID_D2H_RSP, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(d2h_rsp_rspsfwdm, CXL_PMU_GID_D2H_RSP, BIT(7)),
CXL_PMU_EVENT_CXL_ATTR(d2h_rsp_rspifwdm, CXL_PMU_GID_D2H_RSP, BIT(15)),
CXL_PMU_EVENT_CXL_ATTR(d2h_rsp_rspvfwdv, CXL_PMU_GID_D2H_RSP, BIT(22)),
/* CXL rev 3.0 Table 3-21 - CXL.cache - Mapping of H2D Requests to D2H Responses */
CXL_PMU_EVENT_CXL_ATTR(h2d_req_snpdata, CXL_PMU_GID_H2D_REQ, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(h2d_req_snpinv, CXL_PMU_GID_H2D_REQ, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(h2d_req_snpcur, CXL_PMU_GID_H2D_REQ, BIT(3)),
/* CXL rev 3.0 Table 3-22 - H2D Response Opcode Encodings */
CXL_PMU_EVENT_CXL_ATTR(h2d_rsp_writepull, CXL_PMU_GID_H2D_RSP, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(h2d_rsp_go, CXL_PMU_GID_H2D_RSP, BIT(4)),
CXL_PMU_EVENT_CXL_ATTR(h2d_rsp_gowritepull, CXL_PMU_GID_H2D_RSP, BIT(5)),
CXL_PMU_EVENT_CXL_ATTR(h2d_rsp_extcmp, CXL_PMU_GID_H2D_RSP, BIT(6)),
CXL_PMU_EVENT_CXL_ATTR(h2d_rsp_gowritepulldrop, CXL_PMU_GID_H2D_RSP, BIT(8)),
CXL_PMU_EVENT_CXL_ATTR(h2d_rsp_fastgowritepull, CXL_PMU_GID_H2D_RSP, BIT(13)),
CXL_PMU_EVENT_CXL_ATTR(h2d_rsp_goerrwritepull, CXL_PMU_GID_H2D_RSP, BIT(15)),
/* CXL rev 3.0 Table 13-5 directly lists these */
CXL_PMU_EVENT_CXL_ATTR(cachedata_d2h_data, CXL_PMU_GID_CACHE_DATA, BIT(0)),
CXL_PMU_EVENT_CXL_ATTR(cachedata_h2d_data, CXL_PMU_GID_CACHE_DATA, BIT(1)),
/* CXL rev 3.0 Table 3-29 M2S Req Memory Opcodes */
CXL_PMU_EVENT_CXL_ATTR(m2s_req_meminv, CXL_PMU_GID_M2S_REQ, BIT(0)),
CXL_PMU_EVENT_CXL_ATTR(m2s_req_memrd, CXL_PMU_GID_M2S_REQ, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(m2s_req_memrddata, CXL_PMU_GID_M2S_REQ, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(m2s_req_memrdfwd, CXL_PMU_GID_M2S_REQ, BIT(3)),
CXL_PMU_EVENT_CXL_ATTR(m2s_req_memwrfwd, CXL_PMU_GID_M2S_REQ, BIT(4)),
CXL_PMU_EVENT_CXL_ATTR(m2s_req_memspecrd, CXL_PMU_GID_M2S_REQ, BIT(8)),
CXL_PMU_EVENT_CXL_ATTR(m2s_req_meminvnt, CXL_PMU_GID_M2S_REQ, BIT(9)),
CXL_PMU_EVENT_CXL_ATTR(m2s_req_memcleanevict, CXL_PMU_GID_M2S_REQ, BIT(10)),
/* CXL rev 3.0 Table 3-35 M2S RwD Memory Opcodes */
CXL_PMU_EVENT_CXL_ATTR(m2s_rwd_memwr, CXL_PMU_GID_M2S_RWD, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(m2s_rwd_memwrptl, CXL_PMU_GID_M2S_RWD, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(m2s_rwd_biconflict, CXL_PMU_GID_M2S_RWD, BIT(4)),
/* CXL rev 3.0 Table 3-38 M2S BIRsp Memory Opcodes */
CXL_PMU_EVENT_CXL_ATTR(m2s_birsp_i, CXL_PMU_GID_M2S_BIRSP, BIT(0)),
CXL_PMU_EVENT_CXL_ATTR(m2s_birsp_s, CXL_PMU_GID_M2S_BIRSP, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(m2s_birsp_e, CXL_PMU_GID_M2S_BIRSP, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(m2s_birsp_iblk, CXL_PMU_GID_M2S_BIRSP, BIT(4)),
CXL_PMU_EVENT_CXL_ATTR(m2s_birsp_sblk, CXL_PMU_GID_M2S_BIRSP, BIT(5)),
CXL_PMU_EVENT_CXL_ATTR(m2s_birsp_eblk, CXL_PMU_GID_M2S_BIRSP, BIT(6)),
/* CXL rev 3.0 Table 3-40 S2M BISnp Opcodes */
CXL_PMU_EVENT_CXL_ATTR(s2m_bisnp_cur, CXL_PMU_GID_S2M_BISNP, BIT(0)),
CXL_PMU_EVENT_CXL_ATTR(s2m_bisnp_data, CXL_PMU_GID_S2M_BISNP, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(s2m_bisnp_inv, CXL_PMU_GID_S2M_BISNP, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(s2m_bisnp_curblk, CXL_PMU_GID_S2M_BISNP, BIT(4)),
CXL_PMU_EVENT_CXL_ATTR(s2m_bisnp_datblk, CXL_PMU_GID_S2M_BISNP, BIT(5)),
CXL_PMU_EVENT_CXL_ATTR(s2m_bisnp_invblk, CXL_PMU_GID_S2M_BISNP, BIT(6)),
/* CXL rev 3.0 Table 3-43 S2M NDR Opcopdes */
CXL_PMU_EVENT_CXL_ATTR(s2m_ndr_cmp, CXL_PMU_GID_S2M_NDR, BIT(0)),
CXL_PMU_EVENT_CXL_ATTR(s2m_ndr_cmps, CXL_PMU_GID_S2M_NDR, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(s2m_ndr_cmpe, CXL_PMU_GID_S2M_NDR, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(s2m_ndr_biconflictack, CXL_PMU_GID_S2M_NDR, BIT(4)),
/* CXL rev 3.0 Table 3-46 S2M DRS opcodes */
CXL_PMU_EVENT_CXL_ATTR(s2m_drs_memdata, CXL_PMU_GID_S2M_DRS, BIT(0)),
CXL_PMU_EVENT_CXL_ATTR(s2m_drs_memdatanxm, CXL_PMU_GID_S2M_DRS, BIT(1)),
/* CXL rev 3.0 Table 13-5 directly lists these */
CXL_PMU_EVENT_CXL_ATTR(ddr_act, CXL_PMU_GID_DDR, BIT(0)),
CXL_PMU_EVENT_CXL_ATTR(ddr_pre, CXL_PMU_GID_DDR, BIT(1)),
CXL_PMU_EVENT_CXL_ATTR(ddr_casrd, CXL_PMU_GID_DDR, BIT(2)),
CXL_PMU_EVENT_CXL_ATTR(ddr_caswr, CXL_PMU_GID_DDR, BIT(3)),
CXL_PMU_EVENT_CXL_ATTR(ddr_refresh, CXL_PMU_GID_DDR, BIT(4)),
CXL_PMU_EVENT_CXL_ATTR(ddr_selfrefreshent, CXL_PMU_GID_DDR, BIT(5)),
CXL_PMU_EVENT_CXL_ATTR(ddr_rfm, CXL_PMU_GID_DDR, BIT(6)),
NULL
};
static struct cxl_pmu_ev_cap *cxl_pmu_find_fixed_counter_ev_cap(struct cxl_pmu_info *info,
int vid, int gid, int msk)
{
struct cxl_pmu_ev_cap *pmu_ev;
list_for_each_entry(pmu_ev, &info->event_caps_fixed, node) {
if (vid != pmu_ev->vid || gid != pmu_ev->gid)
continue;
/* Precise match for fixed counter */
if (msk == pmu_ev->msk)
return pmu_ev;
}
return ERR_PTR(-EINVAL);
}
static struct cxl_pmu_ev_cap *cxl_pmu_find_config_counter_ev_cap(struct cxl_pmu_info *info,
int vid, int gid, int msk)
{
struct cxl_pmu_ev_cap *pmu_ev;
list_for_each_entry(pmu_ev, &info->event_caps_configurable, node) {
if (vid != pmu_ev->vid || gid != pmu_ev->gid)
continue;
/* Request mask must be subset of supported */
if (msk & ~pmu_ev->msk)
continue;
return pmu_ev;
}
return ERR_PTR(-EINVAL);
}
static umode_t cxl_pmu_event_is_visible(struct kobject *kobj, struct attribute *attr, int a)
{
struct device_attribute *dev_attr = container_of(attr, struct device_attribute, attr);
struct perf_pmu_events_attr *pmu_attr =
container_of(dev_attr, struct perf_pmu_events_attr, attr);
struct device *dev = kobj_to_dev(kobj);
struct cxl_pmu_info *info = dev_get_drvdata(dev);
int vid = FIELD_GET(CXL_PMU_ATTR_CONFIG_VID_MSK, pmu_attr->id);
int gid = FIELD_GET(CXL_PMU_ATTR_CONFIG_GID_MSK, pmu_attr->id);
int msk = FIELD_GET(CXL_PMU_ATTR_CONFIG_MASK_MSK, pmu_attr->id);
if (!IS_ERR(cxl_pmu_find_fixed_counter_ev_cap(info, vid, gid, msk)))
return attr->mode;
if (!IS_ERR(cxl_pmu_find_config_counter_ev_cap(info, vid, gid, msk)))
return attr->mode;
return 0;
}
static const struct attribute_group cxl_pmu_events = {
.name = "events",
.attrs = cxl_pmu_event_attrs,
.is_visible = cxl_pmu_event_is_visible,
};
static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct cxl_pmu_info *info = dev_get_drvdata(dev);
return cpumap_print_to_pagebuf(true, buf, cpumask_of(info->on_cpu));
}
static DEVICE_ATTR_RO(cpumask);
static struct attribute *cxl_pmu_cpumask_attrs[] = {
&dev_attr_cpumask.attr,
NULL
};
static const struct attribute_group cxl_pmu_cpumask_group = {
.attrs = cxl_pmu_cpumask_attrs,
};
static const struct attribute_group *cxl_pmu_attr_groups[] = {
&cxl_pmu_events,
&cxl_pmu_format_group,
&cxl_pmu_cpumask_group,
NULL
};
/* If counter_idx == NULL, don't try to allocate a counter. */
static int cxl_pmu_get_event_idx(struct perf_event *event, int *counter_idx,
int *event_idx)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
DECLARE_BITMAP(configurable_and_free, CXL_PMU_MAX_COUNTERS);
struct cxl_pmu_ev_cap *pmu_ev;
u32 mask;
u16 gid, vid;
int i;
vid = cxl_pmu_config_get_vid(event);
gid = cxl_pmu_config_get_gid(event);
mask = cxl_pmu_config_get_mask(event);
pmu_ev = cxl_pmu_find_fixed_counter_ev_cap(info, vid, gid, mask);
if (!IS_ERR(pmu_ev)) {
if (!counter_idx)
return 0;
if (!test_bit(pmu_ev->counter_idx, info->used_counter_bm)) {
*counter_idx = pmu_ev->counter_idx;
return 0;
}
/* Fixed counter is in use, but maybe a configurable one? */
}
pmu_ev = cxl_pmu_find_config_counter_ev_cap(info, vid, gid, mask);
if (!IS_ERR(pmu_ev)) {
if (!counter_idx)
return 0;
bitmap_andnot(configurable_and_free, info->conf_counter_bm,
info->used_counter_bm, CXL_PMU_MAX_COUNTERS);
i = find_first_bit(configurable_and_free, CXL_PMU_MAX_COUNTERS);
if (i == CXL_PMU_MAX_COUNTERS)
return -EINVAL;
*counter_idx = i;
return 0;
}
return -EINVAL;
}
static int cxl_pmu_event_init(struct perf_event *event)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
int rc;
/* Top level type sanity check - is this a Hardware Event being requested */
if (event->attr.type != event->pmu->type)
return -ENOENT;
if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
return -EOPNOTSUPP;
/* TODO: Validation of any filter */
/*
* Verify that it is possible to count what was requested. Either must
* be a fixed counter that is a precise match or a configurable counter
* where this is a subset.
*/
rc = cxl_pmu_get_event_idx(event, NULL, NULL);
if (rc < 0)
return rc;
event->cpu = info->on_cpu;
return 0;
}
static void cxl_pmu_enable(struct pmu *pmu)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(pmu);
void __iomem *base = info->base;
/* Can assume frozen at this stage */
writeq(0, base + CXL_PMU_FREEZE_REG);
}
static void cxl_pmu_disable(struct pmu *pmu)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(pmu);
void __iomem *base = info->base;
/*
* Whilst bits above number of counters are RsvdZ
* they are unlikely to be repurposed given
* number of counters is allowed to be 64 leaving
* no reserved bits. Hence this is only slightly
* naughty.
*/
writeq(GENMASK_ULL(63, 0), base + CXL_PMU_FREEZE_REG);
}
static void cxl_pmu_event_start(struct perf_event *event, int flags)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
struct hw_perf_event *hwc = &event->hw;
void __iomem *base = info->base;
u64 cfg;
/*
* All paths to here should either set these flags directly or
* call cxl_pmu_event_stop() which will ensure the correct state.
*/
if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED)))
return;
WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
hwc->state = 0;
/*
* Currently only hdm filter control is implemnted, this code will
* want generalizing when more filters are added.
*/
if (info->filter_hdm) {
if (cxl_pmu_config1_hdm_filter_en(event))
cfg = cxl_pmu_config2_get_hdm_decoder(event);
else
cfg = GENMASK(31, 0); /* No filtering if 0xFFFF_FFFF */
writeq(cfg, base + CXL_PMU_FILTER_CFG_REG(hwc->idx, 0));
}
cfg = readq(base + CXL_PMU_COUNTER_CFG_REG(hwc->idx));
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_INT_ON_OVRFLW, 1);
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_FREEZE_ON_OVRFLW, 1);
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_ENABLE, 1);
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_EDGE,
cxl_pmu_config1_get_edge(event) ? 1 : 0);
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_INVERT,
cxl_pmu_config1_get_invert(event) ? 1 : 0);
/* Fixed purpose counters have next two fields RO */
if (test_bit(hwc->idx, info->conf_counter_bm)) {
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK,
hwc->event_base);
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_EVENTS_MSK,
cxl_pmu_config_get_mask(event));
}
cfg &= ~CXL_PMU_COUNTER_CFG_THRESHOLD_MSK;
/*
* For events that generate only 1 count per clock the CXL 3.0 spec
* states the threshold shall be set to 1 but if set to 0 it will
* count the raw value anwyay?
* There is no definition of what events will count multiple per cycle
* and hence to which non 1 values of threshold can apply.
* (CXL 3.0 8.2.7.2.1 Counter Configuration - threshold field definition)
*/
cfg |= FIELD_PREP(CXL_PMU_COUNTER_CFG_THRESHOLD_MSK,
cxl_pmu_config1_get_threshold(event));
writeq(cfg, base + CXL_PMU_COUNTER_CFG_REG(hwc->idx));
local64_set(&hwc->prev_count, 0);
writeq(0, base + CXL_PMU_COUNTER_REG(hwc->idx));
perf_event_update_userpage(event);
}
static u64 cxl_pmu_read_counter(struct perf_event *event)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
void __iomem *base = info->base;
return readq(base + CXL_PMU_COUNTER_REG(event->hw.idx));
}
static void __cxl_pmu_read(struct perf_event *event, bool overflow)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
struct hw_perf_event *hwc = &event->hw;
u64 new_cnt, prev_cnt, delta;
do {
prev_cnt = local64_read(&hwc->prev_count);
new_cnt = cxl_pmu_read_counter(event);
} while (local64_cmpxchg(&hwc->prev_count, prev_cnt, new_cnt) != prev_cnt);
/*
* If we know an overflow occur then take that into account.
* Note counter is not reset as that would lose events
*/
delta = (new_cnt - prev_cnt) & GENMASK_ULL(info->counter_width - 1, 0);
if (overflow && delta < GENMASK_ULL(info->counter_width - 1, 0))
delta += (1UL << info->counter_width);
local64_add(delta, &event->count);
}
static void cxl_pmu_read(struct perf_event *event)
{
__cxl_pmu_read(event, false);
}
static void cxl_pmu_event_stop(struct perf_event *event, int flags)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
void __iomem *base = info->base;
struct hw_perf_event *hwc = &event->hw;
u64 cfg;
cxl_pmu_read(event);
WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
hwc->state |= PERF_HES_STOPPED;
cfg = readq(base + CXL_PMU_COUNTER_CFG_REG(hwc->idx));
cfg &= ~(FIELD_PREP(CXL_PMU_COUNTER_CFG_INT_ON_OVRFLW, 1) |
FIELD_PREP(CXL_PMU_COUNTER_CFG_ENABLE, 1));
writeq(cfg, base + CXL_PMU_COUNTER_CFG_REG(hwc->idx));
hwc->state |= PERF_HES_UPTODATE;
}
static int cxl_pmu_event_add(struct perf_event *event, int flags)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
struct hw_perf_event *hwc = &event->hw;
int idx, rc;
int event_idx = 0;
hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
rc = cxl_pmu_get_event_idx(event, &idx, &event_idx);
if (rc < 0)
return rc;
hwc->idx = idx;
/* Only set for configurable counters */
hwc->event_base = event_idx;
info->hw_events[idx] = event;
set_bit(idx, info->used_counter_bm);
if (flags & PERF_EF_START)
cxl_pmu_event_start(event, PERF_EF_RELOAD);
return 0;
}
static void cxl_pmu_event_del(struct perf_event *event, int flags)
{
struct cxl_pmu_info *info = pmu_to_cxl_pmu_info(event->pmu);
struct hw_perf_event *hwc = &event->hw;
cxl_pmu_event_stop(event, PERF_EF_UPDATE);
clear_bit(hwc->idx, info->used_counter_bm);
info->hw_events[hwc->idx] = NULL;
perf_event_update_userpage(event);
}
static irqreturn_t cxl_pmu_irq(int irq, void *data)
{
struct cxl_pmu_info *info = data;
void __iomem *base = info->base;
u64 overflowed;
DECLARE_BITMAP(overflowedbm, 64);
int i;
overflowed = readq(base + CXL_PMU_OVERFLOW_REG);
/* Interrupt may be shared, so maybe it isn't ours */
if (!overflowed)
return IRQ_NONE;
bitmap_from_arr64(overflowedbm, &overflowed, 64);
for_each_set_bit(i, overflowedbm, info->num_counters) {
struct perf_event *event = info->hw_events[i];
if (!event) {
dev_dbg(info->pmu.dev,
"overflow but on non enabled counter %d\n", i);
continue;
}
__cxl_pmu_read(event, true);
}
writeq(overflowed, base + CXL_PMU_OVERFLOW_REG);
return IRQ_HANDLED;
}
static void cxl_pmu_perf_unregister(void *_info)
{
struct cxl_pmu_info *info = _info;
perf_pmu_unregister(&info->pmu);
}
static void cxl_pmu_cpuhp_remove(void *_info)
{
struct cxl_pmu_info *info = _info;
cpuhp_state_remove_instance_nocalls(cxl_pmu_cpuhp_state_num, &info->node);
}
static int cxl_pmu_probe(struct device *dev)
{
struct cxl_pmu *pmu = to_cxl_pmu(dev);
struct pci_dev *pdev = to_pci_dev(dev->parent);
struct cxl_pmu_info *info;
char *irq_name;
char *dev_name;
int rc, irq;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
dev_set_drvdata(dev, info);
INIT_LIST_HEAD(&info->event_caps_fixed);
INIT_LIST_HEAD(&info->event_caps_configurable);
info->base = pmu->base;
info->on_cpu = -1;
rc = cxl_pmu_parse_caps(dev, info);
if (rc)
return rc;
info->hw_events = devm_kcalloc(dev, sizeof(*info->hw_events),
info->num_counters, GFP_KERNEL);
if (!info->hw_events)
return -ENOMEM;
switch (pmu->type) {
case CXL_PMU_MEMDEV:
dev_name = devm_kasprintf(dev, GFP_KERNEL, "cxl_pmu_mem%d.%d",
pmu->assoc_id, pmu->index);
break;
}
if (!dev_name)
return -ENOMEM;
info->pmu = (struct pmu) {
.name = dev_name,
.parent = dev,
.module = THIS_MODULE,
.event_init = cxl_pmu_event_init,
.pmu_enable = cxl_pmu_enable,
.pmu_disable = cxl_pmu_disable,
.add = cxl_pmu_event_add,
.del = cxl_pmu_event_del,
.start = cxl_pmu_event_start,
.stop = cxl_pmu_event_stop,
.read = cxl_pmu_read,
.task_ctx_nr = perf_invalid_context,
.attr_groups = cxl_pmu_attr_groups,
.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
};
if (info->irq <= 0)
return -EINVAL;
rc = pci_irq_vector(pdev, info->irq);
if (rc < 0)
return rc;
irq = rc;
irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_overflow\n", dev_name);
if (!irq_name)
return -ENOMEM;
rc = devm_request_irq(dev, irq, cxl_pmu_irq, IRQF_SHARED | IRQF_ONESHOT,
irq_name, info);
if (rc)
return rc;
info->irq = irq;
rc = cpuhp_state_add_instance(cxl_pmu_cpuhp_state_num, &info->node);
if (rc)
return rc;
rc = devm_add_action_or_reset(dev, cxl_pmu_cpuhp_remove, info);
if (rc)
return rc;
rc = perf_pmu_register(&info->pmu, info->pmu.name, -1);
if (rc)
return rc;
rc = devm_add_action_or_reset(dev, cxl_pmu_perf_unregister, info);
if (rc)
return rc;
return 0;
}
static struct cxl_driver cxl_pmu_driver = {
.name = "cxl_pmu",
.probe = cxl_pmu_probe,
.id = CXL_DEVICE_PMU,
};
static int cxl_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
{
struct cxl_pmu_info *info = hlist_entry_safe(node, struct cxl_pmu_info, node);
if (info->on_cpu != -1)
return 0;
info->on_cpu = cpu;
/*
* CPU HP lock is held so we should be guaranteed that the CPU hasn't yet
* gone away again.
*/
WARN_ON(irq_set_affinity(info->irq, cpumask_of(cpu)));
return 0;
}
static int cxl_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
{
struct cxl_pmu_info *info = hlist_entry_safe(node, struct cxl_pmu_info, node);
unsigned int target;
if (info->on_cpu != cpu)
return 0;
info->on_cpu = -1;
target = cpumask_any_but(cpu_online_mask, cpu);
if (target >= nr_cpu_ids) {
dev_err(info->pmu.dev, "Unable to find a suitable CPU\n");
return 0;
}
perf_pmu_migrate_context(&info->pmu, cpu, target);
info->on_cpu = target;
/*
* CPU HP lock is held so we should be guaranteed that this CPU hasn't yet
* gone away.
*/
WARN_ON(irq_set_affinity(info->irq, cpumask_of(target)));
return 0;
}
static __init int cxl_pmu_init(void)
{
int rc;
rc = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
"AP_PERF_CXL_PMU_ONLINE",
cxl_pmu_online_cpu, cxl_pmu_offline_cpu);
if (rc < 0)
return rc;
cxl_pmu_cpuhp_state_num = rc;
rc = cxl_driver_register(&cxl_pmu_driver);
if (rc)
cpuhp_remove_multi_state(cxl_pmu_cpuhp_state_num);
return rc;
}
static __exit void cxl_pmu_exit(void)
{
cxl_driver_unregister(&cxl_pmu_driver);
cpuhp_remove_multi_state(cxl_pmu_cpuhp_state_num);
}
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(CXL);
module_init(cxl_pmu_init);
module_exit(cxl_pmu_exit);
MODULE_ALIAS_CXL(CXL_DEVICE_PMU);
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