| Message ID | 20230704093242.583575-17-s.hauer@pengutronix.de (mailing list archive) |
|---|---|
| State | Changes Requested, archived |
| Delegated to: | Chanwoo Choi |
| Headers | show |
| Series | Add perf support to the rockchip-dfi driver | expand |
On 23. 7. 4. 18:32, Sascha Hauer wrote: > The DFI is a unit which is suitable for measuring DDR utilization, but > so far it could only be used as an event driver for the DDR frequency > scaling driver. This adds perf support to the DFI driver. > > Usage with the 'perf' tool can look like: > > perf stat -a -e rockchip_ddr/cycles/,\ > rockchip_ddr/read-bytes/,\ > rockchip_ddr/write-bytes/,\ > rockchip_ddr/bytes/ sleep 1 > > Performance counter stats for 'system wide': > > 1582524826 rockchip_ddr/cycles/ > 1802.25 MB rockchip_ddr/read-bytes/ > 1793.72 MB rockchip_ddr/write-bytes/ > 3595.90 MB rockchip_ddr/bytes/ > > 1.014369709 seconds time elapsed > > perf support has been tested on a RK3568 and a RK3399, the latter with > dual channel DDR. > > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> > Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> > --- > > Notes: > Changes since v5: > - Add missing initialization of &dfi->last_perf_count > > Changes since v4: > > - use __stringify to ensure event type definitions and event numbers in sysfs are consistent > - only use 64bit values in structs holding counters > - support monitoring individual DDR channels > - fix return value in rockchip_ddr_perf_event_init(): -EOPNOTSUPP -> -EINVAL > - check for invalid event->attr.config values > - start hrtimer to trigger in one second, not immediately > - use devm_add_action_or_reset() > - add suppress_bind_attrs > - enable DDRMON during probe when perf is enabled > - use a seqlock to protect perf reading the counters from the hrtimer callback modifying them > > drivers/devfreq/event/rockchip-dfi.c | 442 ++++++++++++++++++++++++++- > include/soc/rockchip/rk3399_grf.h | 2 + > include/soc/rockchip/rk3568_grf.h | 1 + > 3 files changed, 440 insertions(+), 5 deletions(-) > > diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c > index 50e497455dc69..969b62f071b83 100644 > --- a/drivers/devfreq/event/rockchip-dfi.c > +++ b/drivers/devfreq/event/rockchip-dfi.c > @@ -16,10 +16,12 @@ > #include <linux/regmap.h> > #include <linux/slab.h> > #include <linux/list.h> > +#include <linux/seqlock.h> > #include <linux/of.h> > #include <linux/of_device.h> > #include <linux/bitfield.h> > #include <linux/bits.h> > +#include <linux/perf_event.h> > > #include <soc/rockchip/rockchip_grf.h> > #include <soc/rockchip/rk3399_grf.h> > @@ -41,19 +43,39 @@ > DDRMON_CTRL_LPDDR4 | \ > DDRMON_CTRL_LPDDR23) > > +#define DDRMON_CH0_WR_NUM 0x20 > +#define DDRMON_CH0_RD_NUM 0x24 > #define DDRMON_CH0_COUNT_NUM 0x28 > #define DDRMON_CH0_DFI_ACCESS_NUM 0x2c > #define DDRMON_CH1_COUNT_NUM 0x3c > #define DDRMON_CH1_DFI_ACCESS_NUM 0x40 > > +#define PERF_EVENT_CYCLES 0x0 > +#define PERF_EVENT_READ_BYTES 0x1 > +#define PERF_EVENT_WRITE_BYTES 0x2 > +#define PERF_EVENT_READ_BYTES0 0x3 > +#define PERF_EVENT_WRITE_BYTES0 0x4 > +#define PERF_EVENT_READ_BYTES1 0x5 > +#define PERF_EVENT_WRITE_BYTES1 0x6 > +#define PERF_EVENT_READ_BYTES2 0x7 > +#define PERF_EVENT_WRITE_BYTES2 0x8 > +#define PERF_EVENT_READ_BYTES3 0x9 > +#define PERF_EVENT_WRITE_BYTES3 0xa > +#define PERF_EVENT_BYTES 0xb > +#define PERF_ACCESS_TYPE_MAX 0xc > + > /** > * struct dmc_count_channel - structure to hold counter values from the DDR controller > * @access: Number of read and write accesses > * @clock_cycles: DDR clock cycles > + * @read_access: number of read accesses > + * @write_acccess: number of write accesses > */ > struct dmc_count_channel { > - u32 access; > - u32 clock_cycles; > + u64 access; > + u64 clock_cycles; > + u64 read_access; > + u64 write_access; > }; > > struct dmc_count { > @@ -69,6 +91,11 @@ struct rockchip_dfi { > struct devfreq_event_dev *edev; > struct devfreq_event_desc desc; > struct dmc_count last_event_count; > + > + struct dmc_count last_perf_count; > + struct dmc_count total_count; > + seqlock_t count_seqlock; /* protects last_perf_count and total_count */ > + > struct device *dev; > void __iomem *regs; > struct regmap *regmap_pmu; > @@ -77,6 +104,14 @@ struct rockchip_dfi { > struct mutex mutex; > u32 ddr_type; > unsigned int channel_mask; > + enum cpuhp_state cpuhp_state; > + struct hlist_node node; > + struct pmu pmu; > + struct hrtimer timer; > + unsigned int cpu; > + int active_events; > + int burst_len; > + int buswidth[DMC_MAX_CHANNELS]; > }; > > static int rockchip_dfi_enable(struct rockchip_dfi *dfi) > @@ -145,7 +180,7 @@ static void rockchip_dfi_disable(struct rockchip_dfi *dfi) > mutex_unlock(&dfi->mutex); > } > > -static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *count) > +static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *c) Actually, this change is not related to the patch's role which supports perf. Also, it is better to use 'res' argument name because rockchip_ddr_perf_counters_add() used the 'struct dmc_count *res' argument name. > { > u32 i; > void __iomem *dfi_regs = dfi->regs; > @@ -153,13 +188,36 @@ static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_coun > for (i = 0; i < DMC_MAX_CHANNELS; i++) { > if (!(dfi->channel_mask & BIT(i))) > continue; > - count->c[i].access = readl_relaxed(dfi_regs + > + c->c[i].read_access = readl_relaxed(dfi_regs + > + DDRMON_CH0_RD_NUM + i * 20); > + c->c[i].write_access = readl_relaxed(dfi_regs + > + DDRMON_CH0_WR_NUM + i * 20); > + c->c[i].access = readl_relaxed(dfi_regs + > DDRMON_CH0_DFI_ACCESS_NUM + i * 20); > - count->c[i].clock_cycles = readl_relaxed(dfi_regs + > + c->c[i].clock_cycles = readl_relaxed(dfi_regs + > DDRMON_CH0_COUNT_NUM + i * 20); > } > } > > +static void rockchip_ddr_perf_counters_add(struct rockchip_dfi *dfi, > + const struct dmc_count *now, > + struct dmc_count *res) > +{ > + const struct dmc_count *last = &dfi->last_perf_count; > + int i; > + > + for (i = 0; i < DMC_MAX_CHANNELS; i++) { > + res->c[i].read_access = dfi->total_count.c[i].read_access + > + (u32)(now->c[i].read_access - last->c[i].read_access); > + res->c[i].write_access = dfi->total_count.c[i].write_access + > + (u32)(now->c[i].write_access - last->c[i].write_access); > + res->c[i].access = dfi->total_count.c[i].access + > + (u32)(now->c[i].access - last->c[i].access); > + res->c[i].clock_cycles = dfi->total_count.c[i].clock_cycles + > + (u32)(now->c[i].clock_cycles - last->c[i].clock_cycles); > + } > +} > + > static int rockchip_dfi_event_disable(struct devfreq_event_dev *edev) > { > struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev); > @@ -223,6 +281,370 @@ static const struct devfreq_event_ops rockchip_dfi_ops = { > .set_event = rockchip_dfi_set_event, > }; > > +#ifdef CONFIG_PERF_EVENTS > + > +static ssize_t ddr_perf_cpumask_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct pmu *pmu = dev_get_drvdata(dev); > + struct rockchip_dfi *dfi = container_of(pmu, struct rockchip_dfi, pmu); > + > + return cpumap_print_to_pagebuf(true, buf, cpumask_of(dfi->cpu)); > +} > + > +static struct device_attribute ddr_perf_cpumask_attr = > + __ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL); > + > +static struct attribute *ddr_perf_cpumask_attrs[] = { > + &ddr_perf_cpumask_attr.attr, > + NULL, > +}; > + > +static const struct attribute_group ddr_perf_cpumask_attr_group = { > + .attrs = ddr_perf_cpumask_attrs, > +}; > + > +PMU_EVENT_ATTR_STRING(cycles, ddr_pmu_cycles, "event="__stringify(PERF_EVENT_CYCLES)) > + > +#define DFI_PMU_EVENT_ATTR(_name, _var, _str) \ > + PMU_EVENT_ATTR_STRING(_name, _var, _str); \ > + PMU_EVENT_ATTR_STRING(_name.unit, _var##_unit, "MB"); \ > + PMU_EVENT_ATTR_STRING(_name.scale, _var##_scale, "9.536743164e-07") > + > +DFI_PMU_EVENT_ATTR(read-bytes0, ddr_pmu_read_bytes0, "event="__stringify(PERF_EVENT_READ_BYTES0)); > +DFI_PMU_EVENT_ATTR(write-bytes0, ddr_pmu_write_bytes0, "event="__stringify(PERF_EVENT_WRITE_BYTES0)); > + > +DFI_PMU_EVENT_ATTR(read-bytes1, ddr_pmu_read_bytes1, "event="__stringify(PERF_EVENT_READ_BYTES1)); > +DFI_PMU_EVENT_ATTR(write-bytes1, ddr_pmu_write_bytes1, "event="__stringify(PERF_EVENT_WRITE_BYTES1)); > + > +DFI_PMU_EVENT_ATTR(read-bytes2, ddr_pmu_read_bytes2, "event="__stringify(PERF_EVENT_READ_BYTES2)); > +DFI_PMU_EVENT_ATTR(write-bytes2, ddr_pmu_write_bytes2, "event="__stringify(PERF_EVENT_WRITE_BYTES2)); > + > +DFI_PMU_EVENT_ATTR(read-bytes3, ddr_pmu_read_bytes3, "event="__stringify(PERF_EVENT_READ_BYTES3)); > +DFI_PMU_EVENT_ATTR(write-bytes3, ddr_pmu_write_bytes3, "event="__stringify(PERF_EVENT_WRITE_BYTES3)); > + > +DFI_PMU_EVENT_ATTR(read-bytes, ddr_pmu_read_bytes, "event="__stringify(PERF_EVENT_READ_BYTES)); > +DFI_PMU_EVENT_ATTR(write-bytes, ddr_pmu_write_bytes, "event="__stringify(PERF_EVENT_WRITE_BYTES)); > + > +DFI_PMU_EVENT_ATTR(bytes, ddr_pmu_bytes, "event="__stringify(PERF_EVENT_BYTES)); > + > +#define DFI_ATTR_MB(_name) \ > + &_name.attr.attr, \ > + &_name##_unit.attr.attr, \ > + &_name##_scale.attr.attr > + > +static struct attribute *ddr_perf_events_attrs[] = { > + &ddr_pmu_cycles.attr.attr, > + DFI_ATTR_MB(ddr_pmu_read_bytes), > + DFI_ATTR_MB(ddr_pmu_write_bytes), > + DFI_ATTR_MB(ddr_pmu_read_bytes0), > + DFI_ATTR_MB(ddr_pmu_write_bytes0), > + DFI_ATTR_MB(ddr_pmu_read_bytes1), > + DFI_ATTR_MB(ddr_pmu_write_bytes1), > + DFI_ATTR_MB(ddr_pmu_read_bytes2), > + DFI_ATTR_MB(ddr_pmu_write_bytes2), > + DFI_ATTR_MB(ddr_pmu_read_bytes3), > + DFI_ATTR_MB(ddr_pmu_write_bytes3), > + DFI_ATTR_MB(ddr_pmu_bytes), > + NULL, > +}; > + > +static const struct attribute_group ddr_perf_events_attr_group = { > + .name = "events", > + .attrs = ddr_perf_events_attrs, > +}; > + > +PMU_FORMAT_ATTR(event, "config:0-7"); > + > +static struct attribute *ddr_perf_format_attrs[] = { > + &format_attr_event.attr, > + NULL, > +}; > + > +static const struct attribute_group ddr_perf_format_attr_group = { > + .name = "format", > + .attrs = ddr_perf_format_attrs, > +}; > + > +static const struct attribute_group *attr_groups[] = { > + &ddr_perf_events_attr_group, > + &ddr_perf_cpumask_attr_group, > + &ddr_perf_format_attr_group, > + NULL, > +}; > + > +static int rockchip_ddr_perf_event_init(struct perf_event *event) > +{ > + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); > + > + if (event->attr.type != event->pmu->type) > + return -ENOENT; > + > + if (event->attach_state & PERF_ATTACH_TASK) > + return -EINVAL; > + > + if (event->cpu < 0) { > + dev_warn(dfi->dev, "Can't provide per-task data!\n"); > + return -EINVAL; > + } > + > + return 0; > +} > + > +static u64 rockchip_ddr_perf_event_get_count(struct perf_event *event) > +{ > + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); > + int blen = dfi->burst_len; > + struct dmc_count total, now; > + unsigned int seq; > + u64 c = 0; Actually, it is difficult to understand the meaning of 'c' local variable name. Need to use the more clear vairable name instead of 'c'. > + int i; > + > + rockchip_dfi_read_counters(dfi, &now); > + > + do { > + seq = read_seqbegin(&dfi->count_seqlock); > + > + rockchip_ddr_perf_counters_add(dfi, &now, &total); > + Remove unneeded blank line. > + } while (read_seqretry(&dfi->count_seqlock, seq)); (snip) I added the some comment. If you are fixing the comment, feel free to add my ack. Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
On Mon, Oct 09, 2023 at 06:48:43AM +0900, Chanwoo Choi wrote: > On 23. 7. 4. 18:32, Sascha Hauer wrote: > > The DFI is a unit which is suitable for measuring DDR utilization, but > > so far it could only be used as an event driver for the DDR frequency > > scaling driver. This adds perf support to the DFI driver. > > > > Usage with the 'perf' tool can look like: > > > > perf stat -a -e rockchip_ddr/cycles/,\ > > rockchip_ddr/read-bytes/,\ > > rockchip_ddr/write-bytes/,\ > > rockchip_ddr/bytes/ sleep 1 > > > > Performance counter stats for 'system wide': > > > > 1582524826 rockchip_ddr/cycles/ > > 1802.25 MB rockchip_ddr/read-bytes/ > > 1793.72 MB rockchip_ddr/write-bytes/ > > 3595.90 MB rockchip_ddr/bytes/ > > > > 1.014369709 seconds time elapsed > > > > perf support has been tested on a RK3568 and a RK3399, the latter with > > dual channel DDR. > > > > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> > > Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> > > --- > > > > Notes: > > Changes since v5: > > - Add missing initialization of &dfi->last_perf_count > > > > Changes since v4: > > > > - use __stringify to ensure event type definitions and event numbers in sysfs are consistent > > - only use 64bit values in structs holding counters > > - support monitoring individual DDR channels > > - fix return value in rockchip_ddr_perf_event_init(): -EOPNOTSUPP -> -EINVAL > > - check for invalid event->attr.config values > > - start hrtimer to trigger in one second, not immediately > > - use devm_add_action_or_reset() > > - add suppress_bind_attrs > > - enable DDRMON during probe when perf is enabled > > - use a seqlock to protect perf reading the counters from the hrtimer callback modifying them > > > > drivers/devfreq/event/rockchip-dfi.c | 442 ++++++++++++++++++++++++++- > > include/soc/rockchip/rk3399_grf.h | 2 + > > include/soc/rockchip/rk3568_grf.h | 1 + > > 3 files changed, 440 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c > > index 50e497455dc69..969b62f071b83 100644 > > --- a/drivers/devfreq/event/rockchip-dfi.c > > +++ b/drivers/devfreq/event/rockchip-dfi.c > > @@ -16,10 +16,12 @@ > > #include <linux/regmap.h> > > #include <linux/slab.h> > > #include <linux/list.h> > > +#include <linux/seqlock.h> > > #include <linux/of.h> > > #include <linux/of_device.h> > > #include <linux/bitfield.h> > > #include <linux/bits.h> > > +#include <linux/perf_event.h> > > > > #include <soc/rockchip/rockchip_grf.h> > > #include <soc/rockchip/rk3399_grf.h> > > @@ -41,19 +43,39 @@ > > DDRMON_CTRL_LPDDR4 | \ > > DDRMON_CTRL_LPDDR23) > > > > +#define DDRMON_CH0_WR_NUM 0x20 > > +#define DDRMON_CH0_RD_NUM 0x24 > > #define DDRMON_CH0_COUNT_NUM 0x28 > > #define DDRMON_CH0_DFI_ACCESS_NUM 0x2c > > #define DDRMON_CH1_COUNT_NUM 0x3c > > #define DDRMON_CH1_DFI_ACCESS_NUM 0x40 > > > > +#define PERF_EVENT_CYCLES 0x0 > > +#define PERF_EVENT_READ_BYTES 0x1 > > +#define PERF_EVENT_WRITE_BYTES 0x2 > > +#define PERF_EVENT_READ_BYTES0 0x3 > > +#define PERF_EVENT_WRITE_BYTES0 0x4 > > +#define PERF_EVENT_READ_BYTES1 0x5 > > +#define PERF_EVENT_WRITE_BYTES1 0x6 > > +#define PERF_EVENT_READ_BYTES2 0x7 > > +#define PERF_EVENT_WRITE_BYTES2 0x8 > > +#define PERF_EVENT_READ_BYTES3 0x9 > > +#define PERF_EVENT_WRITE_BYTES3 0xa > > +#define PERF_EVENT_BYTES 0xb > > +#define PERF_ACCESS_TYPE_MAX 0xc > > + > > /** > > * struct dmc_count_channel - structure to hold counter values from the DDR controller > > * @access: Number of read and write accesses > > * @clock_cycles: DDR clock cycles > > + * @read_access: number of read accesses > > + * @write_acccess: number of write accesses > > */ > > struct dmc_count_channel { > > - u32 access; > > - u32 clock_cycles; > > + u64 access; > > + u64 clock_cycles; > > + u64 read_access; > > + u64 write_access; > > }; > > > > struct dmc_count { > > @@ -69,6 +91,11 @@ struct rockchip_dfi { > > struct devfreq_event_dev *edev; > > struct devfreq_event_desc desc; > > struct dmc_count last_event_count; > > + > > + struct dmc_count last_perf_count; > > + struct dmc_count total_count; > > + seqlock_t count_seqlock; /* protects last_perf_count and total_count */ > > + > > struct device *dev; > > void __iomem *regs; > > struct regmap *regmap_pmu; > > @@ -77,6 +104,14 @@ struct rockchip_dfi { > > struct mutex mutex; > > u32 ddr_type; > > unsigned int channel_mask; > > + enum cpuhp_state cpuhp_state; > > + struct hlist_node node; > > + struct pmu pmu; > > + struct hrtimer timer; > > + unsigned int cpu; > > + int active_events; > > + int burst_len; > > + int buswidth[DMC_MAX_CHANNELS]; > > }; > > > > static int rockchip_dfi_enable(struct rockchip_dfi *dfi) > > @@ -145,7 +180,7 @@ static void rockchip_dfi_disable(struct rockchip_dfi *dfi) > > mutex_unlock(&dfi->mutex); > > } > > > > -static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *count) > > +static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *c) > > Actually, this change is not related to the patch's role which supports perf. > Also, it is better to use 'res' argument name because rockchip_ddr_perf_counters_add() > used the 'struct dmc_count *res' argument name. Indeed the variable rename is not required here and for consistency with rockchip_ddr_perf_counters_add() 'res' would be a better name. Are you fine with renaming 'c' to 'res' in this patch or do you want me to make a separate patch from the renaming? > > > > { > > u32 i; > > void __iomem *dfi_regs = dfi->regs; > > @@ -153,13 +188,36 @@ static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_coun > > for (i = 0; i < DMC_MAX_CHANNELS; i++) { > > if (!(dfi->channel_mask & BIT(i))) > > continue; > > - count->c[i].access = readl_relaxed(dfi_regs + > > + c->c[i].read_access = readl_relaxed(dfi_regs + > > + DDRMON_CH0_RD_NUM + i * 20); > > + c->c[i].write_access = readl_relaxed(dfi_regs + > > + DDRMON_CH0_WR_NUM + i * 20); > > + c->c[i].access = readl_relaxed(dfi_regs + > > DDRMON_CH0_DFI_ACCESS_NUM + i * 20); > > - count->c[i].clock_cycles = readl_relaxed(dfi_regs + > > + c->c[i].clock_cycles = readl_relaxed(dfi_regs + > > DDRMON_CH0_COUNT_NUM + i * 20); > > } > > } > > > > +static void rockchip_ddr_perf_counters_add(struct rockchip_dfi *dfi, > > + const struct dmc_count *now, > > + struct dmc_count *res) > > +{ > > + const struct dmc_count *last = &dfi->last_perf_count; > > + int i; > > + > > + for (i = 0; i < DMC_MAX_CHANNELS; i++) { > > + res->c[i].read_access = dfi->total_count.c[i].read_access + > > + (u32)(now->c[i].read_access - last->c[i].read_access); > > + res->c[i].write_access = dfi->total_count.c[i].write_access + > > + (u32)(now->c[i].write_access - last->c[i].write_access); > > + res->c[i].access = dfi->total_count.c[i].access + > > + (u32)(now->c[i].access - last->c[i].access); > > + res->c[i].clock_cycles = dfi->total_count.c[i].clock_cycles + > > + (u32)(now->c[i].clock_cycles - last->c[i].clock_cycles); > > + } > > +} > > + > > static int rockchip_dfi_event_disable(struct devfreq_event_dev *edev) > > { > > struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev); > > @@ -223,6 +281,370 @@ static const struct devfreq_event_ops rockchip_dfi_ops = { > > .set_event = rockchip_dfi_set_event, > > }; > > [...] > > +static u64 rockchip_ddr_perf_event_get_count(struct perf_event *event) > > +{ > > + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); > > + int blen = dfi->burst_len; > > + struct dmc_count total, now; > > + unsigned int seq; > > + u64 c = 0; > > Actually, it is difficult to understand the meaning of 'c' local variable name. > Need to use the more clear vairable name instead of 'c'. 'c' is short for 'count' as in the function name xxx_get_count(). It is initialized to 0, filled with values throughout the function and returned at the end. Which other name do you suggest? Sascha
On 23. 10. 16. 21:16, Sascha Hauer wrote: > On Mon, Oct 09, 2023 at 06:48:43AM +0900, Chanwoo Choi wrote: >> On 23. 7. 4. 18:32, Sascha Hauer wrote: >>> The DFI is a unit which is suitable for measuring DDR utilization, but >>> so far it could only be used as an event driver for the DDR frequency >>> scaling driver. This adds perf support to the DFI driver. >>> >>> Usage with the 'perf' tool can look like: >>> >>> perf stat -a -e rockchip_ddr/cycles/,\ >>> rockchip_ddr/read-bytes/,\ >>> rockchip_ddr/write-bytes/,\ >>> rockchip_ddr/bytes/ sleep 1 >>> >>> Performance counter stats for 'system wide': >>> >>> 1582524826 rockchip_ddr/cycles/ >>> 1802.25 MB rockchip_ddr/read-bytes/ >>> 1793.72 MB rockchip_ddr/write-bytes/ >>> 3595.90 MB rockchip_ddr/bytes/ >>> >>> 1.014369709 seconds time elapsed >>> >>> perf support has been tested on a RK3568 and a RK3399, the latter with >>> dual channel DDR. >>> >>> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> >>> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> >>> --- >>> >>> Notes: >>> Changes since v5: >>> - Add missing initialization of &dfi->last_perf_count >>> >>> Changes since v4: >>> >>> - use __stringify to ensure event type definitions and event numbers in sysfs are consistent >>> - only use 64bit values in structs holding counters >>> - support monitoring individual DDR channels >>> - fix return value in rockchip_ddr_perf_event_init(): -EOPNOTSUPP -> -EINVAL >>> - check for invalid event->attr.config values >>> - start hrtimer to trigger in one second, not immediately >>> - use devm_add_action_or_reset() >>> - add suppress_bind_attrs >>> - enable DDRMON during probe when perf is enabled >>> - use a seqlock to protect perf reading the counters from the hrtimer callback modifying them >>> >>> drivers/devfreq/event/rockchip-dfi.c | 442 ++++++++++++++++++++++++++- >>> include/soc/rockchip/rk3399_grf.h | 2 + >>> include/soc/rockchip/rk3568_grf.h | 1 + >>> 3 files changed, 440 insertions(+), 5 deletions(-) >>> >>> diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c >>> index 50e497455dc69..969b62f071b83 100644 >>> --- a/drivers/devfreq/event/rockchip-dfi.c >>> +++ b/drivers/devfreq/event/rockchip-dfi.c >>> @@ -16,10 +16,12 @@ >>> #include <linux/regmap.h> >>> #include <linux/slab.h> >>> #include <linux/list.h> >>> +#include <linux/seqlock.h> >>> #include <linux/of.h> >>> #include <linux/of_device.h> >>> #include <linux/bitfield.h> >>> #include <linux/bits.h> >>> +#include <linux/perf_event.h> >>> >>> #include <soc/rockchip/rockchip_grf.h> >>> #include <soc/rockchip/rk3399_grf.h> >>> @@ -41,19 +43,39 @@ >>> DDRMON_CTRL_LPDDR4 | \ >>> DDRMON_CTRL_LPDDR23) >>> >>> +#define DDRMON_CH0_WR_NUM 0x20 >>> +#define DDRMON_CH0_RD_NUM 0x24 >>> #define DDRMON_CH0_COUNT_NUM 0x28 >>> #define DDRMON_CH0_DFI_ACCESS_NUM 0x2c >>> #define DDRMON_CH1_COUNT_NUM 0x3c >>> #define DDRMON_CH1_DFI_ACCESS_NUM 0x40 >>> >>> +#define PERF_EVENT_CYCLES 0x0 >>> +#define PERF_EVENT_READ_BYTES 0x1 >>> +#define PERF_EVENT_WRITE_BYTES 0x2 >>> +#define PERF_EVENT_READ_BYTES0 0x3 >>> +#define PERF_EVENT_WRITE_BYTES0 0x4 >>> +#define PERF_EVENT_READ_BYTES1 0x5 >>> +#define PERF_EVENT_WRITE_BYTES1 0x6 >>> +#define PERF_EVENT_READ_BYTES2 0x7 >>> +#define PERF_EVENT_WRITE_BYTES2 0x8 >>> +#define PERF_EVENT_READ_BYTES3 0x9 >>> +#define PERF_EVENT_WRITE_BYTES3 0xa >>> +#define PERF_EVENT_BYTES 0xb >>> +#define PERF_ACCESS_TYPE_MAX 0xc >>> + >>> /** >>> * struct dmc_count_channel - structure to hold counter values from the DDR controller >>> * @access: Number of read and write accesses >>> * @clock_cycles: DDR clock cycles >>> + * @read_access: number of read accesses >>> + * @write_acccess: number of write accesses >>> */ >>> struct dmc_count_channel { >>> - u32 access; >>> - u32 clock_cycles; >>> + u64 access; >>> + u64 clock_cycles; >>> + u64 read_access; >>> + u64 write_access; >>> }; >>> >>> struct dmc_count { >>> @@ -69,6 +91,11 @@ struct rockchip_dfi { >>> struct devfreq_event_dev *edev; >>> struct devfreq_event_desc desc; >>> struct dmc_count last_event_count; >>> + >>> + struct dmc_count last_perf_count; >>> + struct dmc_count total_count; >>> + seqlock_t count_seqlock; /* protects last_perf_count and total_count */ >>> + >>> struct device *dev; >>> void __iomem *regs; >>> struct regmap *regmap_pmu; >>> @@ -77,6 +104,14 @@ struct rockchip_dfi { >>> struct mutex mutex; >>> u32 ddr_type; >>> unsigned int channel_mask; >>> + enum cpuhp_state cpuhp_state; >>> + struct hlist_node node; >>> + struct pmu pmu; >>> + struct hrtimer timer; >>> + unsigned int cpu; >>> + int active_events; >>> + int burst_len; >>> + int buswidth[DMC_MAX_CHANNELS]; >>> }; >>> >>> static int rockchip_dfi_enable(struct rockchip_dfi *dfi) >>> @@ -145,7 +180,7 @@ static void rockchip_dfi_disable(struct rockchip_dfi *dfi) >>> mutex_unlock(&dfi->mutex); >>> } >>> >>> -static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *count) >>> +static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *c) >> >> Actually, this change is not related to the patch's role which supports perf. >> Also, it is better to use 'res' argument name because rockchip_ddr_perf_counters_add() >> used the 'struct dmc_count *res' argument name. > > Indeed the variable rename is not required here and for consistency > with rockchip_ddr_perf_counters_add() 'res' would be a better name. > > Are you fine with renaming 'c' to 'res' in this patch or do you want me > to make a separate patch from the renaming? > >> >> >>> { >>> u32 i; >>> void __iomem *dfi_regs = dfi->regs; >>> @@ -153,13 +188,36 @@ static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_coun >>> for (i = 0; i < DMC_MAX_CHANNELS; i++) { >>> if (!(dfi->channel_mask & BIT(i))) >>> continue; >>> - count->c[i].access = readl_relaxed(dfi_regs + >>> + c->c[i].read_access = readl_relaxed(dfi_regs + >>> + DDRMON_CH0_RD_NUM + i * 20); >>> + c->c[i].write_access = readl_relaxed(dfi_regs + >>> + DDRMON_CH0_WR_NUM + i * 20); >>> + c->c[i].access = readl_relaxed(dfi_regs + >>> DDRMON_CH0_DFI_ACCESS_NUM + i * 20); >>> - count->c[i].clock_cycles = readl_relaxed(dfi_regs + >>> + c->c[i].clock_cycles = readl_relaxed(dfi_regs + >>> DDRMON_CH0_COUNT_NUM + i * 20); >>> } >>> } >>> >>> +static void rockchip_ddr_perf_counters_add(struct rockchip_dfi *dfi, >>> + const struct dmc_count *now, >>> + struct dmc_count *res) >>> +{ >>> + const struct dmc_count *last = &dfi->last_perf_count; >>> + int i; >>> + >>> + for (i = 0; i < DMC_MAX_CHANNELS; i++) { >>> + res->c[i].read_access = dfi->total_count.c[i].read_access + >>> + (u32)(now->c[i].read_access - last->c[i].read_access); >>> + res->c[i].write_access = dfi->total_count.c[i].write_access + >>> + (u32)(now->c[i].write_access - last->c[i].write_access); >>> + res->c[i].access = dfi->total_count.c[i].access + >>> + (u32)(now->c[i].access - last->c[i].access); >>> + res->c[i].clock_cycles = dfi->total_count.c[i].clock_cycles + >>> + (u32)(now->c[i].clock_cycles - last->c[i].clock_cycles); >>> + } >>> +} >>> + >>> static int rockchip_dfi_event_disable(struct devfreq_event_dev *edev) >>> { >>> struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev); >>> @@ -223,6 +281,370 @@ static const struct devfreq_event_ops rockchip_dfi_ops = { >>> .set_event = rockchip_dfi_set_event, >>> }; >>> > > [...] > >>> +static u64 rockchip_ddr_perf_event_get_count(struct perf_event *event) >>> +{ >>> + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); >>> + int blen = dfi->burst_len; >>> + struct dmc_count total, now; >>> + unsigned int seq; >>> + u64 c = 0; >> >> Actually, it is difficult to understand the meaning of 'c' local variable name. >> Need to use the more clear vairable name instead of 'c'. > > 'c' is short for 'count' as in the function name xxx_get_count(). It is > initialized to 0, filled with values throughout the function and > returned at the end. Which other name do you suggest? If c indicats the 'count', better to use 'count' name. Actually, 'c' is difficult to catch the meaning from just name. > > Sascha >
diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c index 50e497455dc69..969b62f071b83 100644 --- a/drivers/devfreq/event/rockchip-dfi.c +++ b/drivers/devfreq/event/rockchip-dfi.c @@ -16,10 +16,12 @@ #include <linux/regmap.h> #include <linux/slab.h> #include <linux/list.h> +#include <linux/seqlock.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/bitfield.h> #include <linux/bits.h> +#include <linux/perf_event.h> #include <soc/rockchip/rockchip_grf.h> #include <soc/rockchip/rk3399_grf.h> @@ -41,19 +43,39 @@ DDRMON_CTRL_LPDDR4 | \ DDRMON_CTRL_LPDDR23) +#define DDRMON_CH0_WR_NUM 0x20 +#define DDRMON_CH0_RD_NUM 0x24 #define DDRMON_CH0_COUNT_NUM 0x28 #define DDRMON_CH0_DFI_ACCESS_NUM 0x2c #define DDRMON_CH1_COUNT_NUM 0x3c #define DDRMON_CH1_DFI_ACCESS_NUM 0x40 +#define PERF_EVENT_CYCLES 0x0 +#define PERF_EVENT_READ_BYTES 0x1 +#define PERF_EVENT_WRITE_BYTES 0x2 +#define PERF_EVENT_READ_BYTES0 0x3 +#define PERF_EVENT_WRITE_BYTES0 0x4 +#define PERF_EVENT_READ_BYTES1 0x5 +#define PERF_EVENT_WRITE_BYTES1 0x6 +#define PERF_EVENT_READ_BYTES2 0x7 +#define PERF_EVENT_WRITE_BYTES2 0x8 +#define PERF_EVENT_READ_BYTES3 0x9 +#define PERF_EVENT_WRITE_BYTES3 0xa +#define PERF_EVENT_BYTES 0xb +#define PERF_ACCESS_TYPE_MAX 0xc + /** * struct dmc_count_channel - structure to hold counter values from the DDR controller * @access: Number of read and write accesses * @clock_cycles: DDR clock cycles + * @read_access: number of read accesses + * @write_acccess: number of write accesses */ struct dmc_count_channel { - u32 access; - u32 clock_cycles; + u64 access; + u64 clock_cycles; + u64 read_access; + u64 write_access; }; struct dmc_count { @@ -69,6 +91,11 @@ struct rockchip_dfi { struct devfreq_event_dev *edev; struct devfreq_event_desc desc; struct dmc_count last_event_count; + + struct dmc_count last_perf_count; + struct dmc_count total_count; + seqlock_t count_seqlock; /* protects last_perf_count and total_count */ + struct device *dev; void __iomem *regs; struct regmap *regmap_pmu; @@ -77,6 +104,14 @@ struct rockchip_dfi { struct mutex mutex; u32 ddr_type; unsigned int channel_mask; + enum cpuhp_state cpuhp_state; + struct hlist_node node; + struct pmu pmu; + struct hrtimer timer; + unsigned int cpu; + int active_events; + int burst_len; + int buswidth[DMC_MAX_CHANNELS]; }; static int rockchip_dfi_enable(struct rockchip_dfi *dfi) @@ -145,7 +180,7 @@ static void rockchip_dfi_disable(struct rockchip_dfi *dfi) mutex_unlock(&dfi->mutex); } -static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *count) +static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *c) { u32 i; void __iomem *dfi_regs = dfi->regs; @@ -153,13 +188,36 @@ static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_coun for (i = 0; i < DMC_MAX_CHANNELS; i++) { if (!(dfi->channel_mask & BIT(i))) continue; - count->c[i].access = readl_relaxed(dfi_regs + + c->c[i].read_access = readl_relaxed(dfi_regs + + DDRMON_CH0_RD_NUM + i * 20); + c->c[i].write_access = readl_relaxed(dfi_regs + + DDRMON_CH0_WR_NUM + i * 20); + c->c[i].access = readl_relaxed(dfi_regs + DDRMON_CH0_DFI_ACCESS_NUM + i * 20); - count->c[i].clock_cycles = readl_relaxed(dfi_regs + + c->c[i].clock_cycles = readl_relaxed(dfi_regs + DDRMON_CH0_COUNT_NUM + i * 20); } } +static void rockchip_ddr_perf_counters_add(struct rockchip_dfi *dfi, + const struct dmc_count *now, + struct dmc_count *res) +{ + const struct dmc_count *last = &dfi->last_perf_count; + int i; + + for (i = 0; i < DMC_MAX_CHANNELS; i++) { + res->c[i].read_access = dfi->total_count.c[i].read_access + + (u32)(now->c[i].read_access - last->c[i].read_access); + res->c[i].write_access = dfi->total_count.c[i].write_access + + (u32)(now->c[i].write_access - last->c[i].write_access); + res->c[i].access = dfi->total_count.c[i].access + + (u32)(now->c[i].access - last->c[i].access); + res->c[i].clock_cycles = dfi->total_count.c[i].clock_cycles + + (u32)(now->c[i].clock_cycles - last->c[i].clock_cycles); + } +} + static int rockchip_dfi_event_disable(struct devfreq_event_dev *edev) { struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev); @@ -223,6 +281,370 @@ static const struct devfreq_event_ops rockchip_dfi_ops = { .set_event = rockchip_dfi_set_event, }; +#ifdef CONFIG_PERF_EVENTS + +static ssize_t ddr_perf_cpumask_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pmu *pmu = dev_get_drvdata(dev); + struct rockchip_dfi *dfi = container_of(pmu, struct rockchip_dfi, pmu); + + return cpumap_print_to_pagebuf(true, buf, cpumask_of(dfi->cpu)); +} + +static struct device_attribute ddr_perf_cpumask_attr = + __ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL); + +static struct attribute *ddr_perf_cpumask_attrs[] = { + &ddr_perf_cpumask_attr.attr, + NULL, +}; + +static const struct attribute_group ddr_perf_cpumask_attr_group = { + .attrs = ddr_perf_cpumask_attrs, +}; + +PMU_EVENT_ATTR_STRING(cycles, ddr_pmu_cycles, "event="__stringify(PERF_EVENT_CYCLES)) + +#define DFI_PMU_EVENT_ATTR(_name, _var, _str) \ + PMU_EVENT_ATTR_STRING(_name, _var, _str); \ + PMU_EVENT_ATTR_STRING(_name.unit, _var##_unit, "MB"); \ + PMU_EVENT_ATTR_STRING(_name.scale, _var##_scale, "9.536743164e-07") + +DFI_PMU_EVENT_ATTR(read-bytes0, ddr_pmu_read_bytes0, "event="__stringify(PERF_EVENT_READ_BYTES0)); +DFI_PMU_EVENT_ATTR(write-bytes0, ddr_pmu_write_bytes0, "event="__stringify(PERF_EVENT_WRITE_BYTES0)); + +DFI_PMU_EVENT_ATTR(read-bytes1, ddr_pmu_read_bytes1, "event="__stringify(PERF_EVENT_READ_BYTES1)); +DFI_PMU_EVENT_ATTR(write-bytes1, ddr_pmu_write_bytes1, "event="__stringify(PERF_EVENT_WRITE_BYTES1)); + +DFI_PMU_EVENT_ATTR(read-bytes2, ddr_pmu_read_bytes2, "event="__stringify(PERF_EVENT_READ_BYTES2)); +DFI_PMU_EVENT_ATTR(write-bytes2, ddr_pmu_write_bytes2, "event="__stringify(PERF_EVENT_WRITE_BYTES2)); + +DFI_PMU_EVENT_ATTR(read-bytes3, ddr_pmu_read_bytes3, "event="__stringify(PERF_EVENT_READ_BYTES3)); +DFI_PMU_EVENT_ATTR(write-bytes3, ddr_pmu_write_bytes3, "event="__stringify(PERF_EVENT_WRITE_BYTES3)); + +DFI_PMU_EVENT_ATTR(read-bytes, ddr_pmu_read_bytes, "event="__stringify(PERF_EVENT_READ_BYTES)); +DFI_PMU_EVENT_ATTR(write-bytes, ddr_pmu_write_bytes, "event="__stringify(PERF_EVENT_WRITE_BYTES)); + +DFI_PMU_EVENT_ATTR(bytes, ddr_pmu_bytes, "event="__stringify(PERF_EVENT_BYTES)); + +#define DFI_ATTR_MB(_name) \ + &_name.attr.attr, \ + &_name##_unit.attr.attr, \ + &_name##_scale.attr.attr + +static struct attribute *ddr_perf_events_attrs[] = { + &ddr_pmu_cycles.attr.attr, + DFI_ATTR_MB(ddr_pmu_read_bytes), + DFI_ATTR_MB(ddr_pmu_write_bytes), + DFI_ATTR_MB(ddr_pmu_read_bytes0), + DFI_ATTR_MB(ddr_pmu_write_bytes0), + DFI_ATTR_MB(ddr_pmu_read_bytes1), + DFI_ATTR_MB(ddr_pmu_write_bytes1), + DFI_ATTR_MB(ddr_pmu_read_bytes2), + DFI_ATTR_MB(ddr_pmu_write_bytes2), + DFI_ATTR_MB(ddr_pmu_read_bytes3), + DFI_ATTR_MB(ddr_pmu_write_bytes3), + DFI_ATTR_MB(ddr_pmu_bytes), + NULL, +}; + +static const struct attribute_group ddr_perf_events_attr_group = { + .name = "events", + .attrs = ddr_perf_events_attrs, +}; + +PMU_FORMAT_ATTR(event, "config:0-7"); + +static struct attribute *ddr_perf_format_attrs[] = { + &format_attr_event.attr, + NULL, +}; + +static const struct attribute_group ddr_perf_format_attr_group = { + .name = "format", + .attrs = ddr_perf_format_attrs, +}; + +static const struct attribute_group *attr_groups[] = { + &ddr_perf_events_attr_group, + &ddr_perf_cpumask_attr_group, + &ddr_perf_format_attr_group, + NULL, +}; + +static int rockchip_ddr_perf_event_init(struct perf_event *event) +{ + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); + + if (event->attr.type != event->pmu->type) + return -ENOENT; + + if (event->attach_state & PERF_ATTACH_TASK) + return -EINVAL; + + if (event->cpu < 0) { + dev_warn(dfi->dev, "Can't provide per-task data!\n"); + return -EINVAL; + } + + return 0; +} + +static u64 rockchip_ddr_perf_event_get_count(struct perf_event *event) +{ + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); + int blen = dfi->burst_len; + struct dmc_count total, now; + unsigned int seq; + u64 c = 0; + int i; + + rockchip_dfi_read_counters(dfi, &now); + + do { + seq = read_seqbegin(&dfi->count_seqlock); + + rockchip_ddr_perf_counters_add(dfi, &now, &total); + + } while (read_seqretry(&dfi->count_seqlock, seq)); + + switch (event->attr.config) { + case PERF_EVENT_CYCLES: + c = total.c[0].clock_cycles; + break; + case PERF_EVENT_READ_BYTES: + for (i = 0; i < DMC_MAX_CHANNELS; i++) + c += total.c[i].read_access * blen * dfi->buswidth[i]; + break; + case PERF_EVENT_WRITE_BYTES: + for (i = 0; i < DMC_MAX_CHANNELS; i++) + c += total.c[i].write_access * blen * dfi->buswidth[i]; + break; + case PERF_EVENT_READ_BYTES0: + c = total.c[0].read_access * blen * dfi->buswidth[0]; + break; + case PERF_EVENT_WRITE_BYTES0: + c = total.c[0].write_access * blen * dfi->buswidth[0]; + break; + case PERF_EVENT_READ_BYTES1: + c = total.c[1].read_access * blen * dfi->buswidth[1]; + break; + case PERF_EVENT_WRITE_BYTES1: + c = total.c[1].write_access * blen * dfi->buswidth[1]; + break; + case PERF_EVENT_READ_BYTES2: + c = total.c[2].read_access * blen * dfi->buswidth[2]; + break; + case PERF_EVENT_WRITE_BYTES2: + c = total.c[2].write_access * blen * dfi->buswidth[2]; + break; + case PERF_EVENT_READ_BYTES3: + c = total.c[3].read_access * blen * dfi->buswidth[3]; + break; + case PERF_EVENT_WRITE_BYTES3: + c = total.c[3].write_access * blen * dfi->buswidth[3]; + break; + case PERF_EVENT_BYTES: + for (i = 0; i < DMC_MAX_CHANNELS; i++) + c += total.c[i].access * blen * dfi->buswidth[i]; + break; + } + + return c; +} + +static void rockchip_ddr_perf_event_update(struct perf_event *event) +{ + u64 now; + s64 prev; + + if (event->attr.config >= PERF_ACCESS_TYPE_MAX) + return; + + now = rockchip_ddr_perf_event_get_count(event); + prev = local64_xchg(&event->hw.prev_count, now); + local64_add(now - prev, &event->count); +} + +static void rockchip_ddr_perf_event_start(struct perf_event *event, int flags) +{ + u64 now = rockchip_ddr_perf_event_get_count(event); + + local64_set(&event->hw.prev_count, now); +} + +static int rockchip_ddr_perf_event_add(struct perf_event *event, int flags) +{ + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); + + dfi->active_events++; + + if (dfi->active_events == 1) { + dfi->total_count = (struct dmc_count){}; + rockchip_dfi_read_counters(dfi, &dfi->last_perf_count); + hrtimer_start(&dfi->timer, ns_to_ktime(NSEC_PER_SEC), HRTIMER_MODE_REL); + } + + if (flags & PERF_EF_START) + rockchip_ddr_perf_event_start(event, flags); + + return 0; +} + +static void rockchip_ddr_perf_event_stop(struct perf_event *event, int flags) +{ + rockchip_ddr_perf_event_update(event); +} + +static void rockchip_ddr_perf_event_del(struct perf_event *event, int flags) +{ + struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu); + + rockchip_ddr_perf_event_stop(event, PERF_EF_UPDATE); + + dfi->active_events--; + + if (dfi->active_events == 0) + hrtimer_cancel(&dfi->timer); +} + +static enum hrtimer_restart rockchip_dfi_timer(struct hrtimer *timer) +{ + struct rockchip_dfi *dfi = container_of(timer, struct rockchip_dfi, timer); + struct dmc_count now, total; + + rockchip_dfi_read_counters(dfi, &now); + + write_seqlock(&dfi->count_seqlock); + + rockchip_ddr_perf_counters_add(dfi, &now, &total); + dfi->total_count = total; + dfi->last_perf_count = now; + + write_sequnlock(&dfi->count_seqlock); + + hrtimer_forward_now(&dfi->timer, ns_to_ktime(NSEC_PER_SEC)); + + return HRTIMER_RESTART; +}; + +static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node) +{ + struct rockchip_dfi *dfi = hlist_entry_safe(node, struct rockchip_dfi, node); + int target; + + if (cpu != dfi->cpu) + return 0; + + target = cpumask_any_but(cpu_online_mask, cpu); + if (target >= nr_cpu_ids) + return 0; + + perf_pmu_migrate_context(&dfi->pmu, cpu, target); + dfi->cpu = target; + + return 0; +} + +static void rockchip_ddr_cpuhp_remove_state(void *data) +{ + struct rockchip_dfi *dfi = data; + + cpuhp_remove_multi_state(dfi->cpuhp_state); + + rockchip_dfi_disable(dfi); +} + +static void rockchip_ddr_cpuhp_remove_instance(void *data) +{ + struct rockchip_dfi *dfi = data; + + cpuhp_state_remove_instance_nocalls(dfi->cpuhp_state, &dfi->node); +} + +static void rockchip_ddr_perf_remove(void *data) +{ + struct rockchip_dfi *dfi = data; + + perf_pmu_unregister(&dfi->pmu); +} + +static int rockchip_ddr_perf_init(struct rockchip_dfi *dfi) +{ + struct pmu *pmu = &dfi->pmu; + int ret; + + seqlock_init(&dfi->count_seqlock); + + pmu->module = THIS_MODULE; + pmu->capabilities = PERF_PMU_CAP_NO_EXCLUDE; + pmu->task_ctx_nr = perf_invalid_context; + pmu->attr_groups = attr_groups; + pmu->event_init = rockchip_ddr_perf_event_init; + pmu->add = rockchip_ddr_perf_event_add; + pmu->del = rockchip_ddr_perf_event_del; + pmu->start = rockchip_ddr_perf_event_start; + pmu->stop = rockchip_ddr_perf_event_stop; + pmu->read = rockchip_ddr_perf_event_update; + + dfi->cpu = raw_smp_processor_id(); + + ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, + "rockchip_ddr_perf_pmu", + NULL, + ddr_perf_offline_cpu); + + if (ret < 0) { + dev_err(dfi->dev, "cpuhp_setup_state_multi failed: %d\n", ret); + return ret; + } + + dfi->cpuhp_state = ret; + + rockchip_dfi_enable(dfi); + + ret = devm_add_action_or_reset(dfi->dev, rockchip_ddr_cpuhp_remove_state, dfi); + if (ret) + return ret; + + ret = cpuhp_state_add_instance_nocalls(dfi->cpuhp_state, &dfi->node); + if (ret) { + dev_err(dfi->dev, "Error %d registering hotplug\n", ret); + return ret; + } + + ret = devm_add_action_or_reset(dfi->dev, rockchip_ddr_cpuhp_remove_instance, dfi); + if (ret) + return ret; + + hrtimer_init(&dfi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + dfi->timer.function = rockchip_dfi_timer; + + switch (dfi->ddr_type) { + case ROCKCHIP_DDRTYPE_LPDDR2: + case ROCKCHIP_DDRTYPE_LPDDR3: + dfi->burst_len = 8; + break; + case ROCKCHIP_DDRTYPE_LPDDR4: + case ROCKCHIP_DDRTYPE_LPDDR4X: + dfi->burst_len = 16; + break; + } + + ret = perf_pmu_register(pmu, "rockchip_ddr", -1); + if (ret) + return ret; + + return devm_add_action_or_reset(dfi->dev, rockchip_ddr_perf_remove, dfi); +} +#else +static int rockchip_ddr_perf_init(struct rockchip_dfi *dfi) +{ + return 0; +} +#endif + static int rk3399_dfi_init(struct rockchip_dfi *dfi) { struct regmap *regmap_pmu = dfi->regmap_pmu; @@ -239,6 +661,9 @@ static int rk3399_dfi_init(struct rockchip_dfi *dfi) dfi->channel_mask = GENMASK(1, 0); + dfi->buswidth[0] = FIELD_GET(RK3399_PMUGRF_OS_REG2_BW_CH0, val) == 0 ? 4 : 2; + dfi->buswidth[1] = FIELD_GET(RK3399_PMUGRF_OS_REG2_BW_CH1, val) == 0 ? 4 : 2; + return 0; }; @@ -255,6 +680,8 @@ static int rk3568_dfi_init(struct rockchip_dfi *dfi) if (FIELD_GET(RK3568_PMUGRF_OS_REG3_SYSREG_VERSION, reg3) >= 0x3) dfi->ddr_type |= FIELD_GET(RK3568_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3, reg3) << 3; + dfi->buswidth[0] = FIELD_GET(RK3568_PMUGRF_OS_REG2_BW_CH0, reg2) == 0 ? 4 : 2; + dfi->channel_mask = 1; return 0; @@ -317,6 +744,10 @@ static int rockchip_dfi_probe(struct platform_device *pdev) return PTR_ERR(dfi->edev); } + ret = rockchip_ddr_perf_init(dfi); + if (ret) + return ret; + platform_set_drvdata(pdev, dfi); return 0; @@ -327,6 +758,7 @@ static struct platform_driver rockchip_dfi_driver = { .driver = { .name = "rockchip-dfi", .of_match_table = rockchip_dfi_id_match, + .suppress_bind_attrs = true, }, }; module_platform_driver(rockchip_dfi_driver); diff --git a/include/soc/rockchip/rk3399_grf.h b/include/soc/rockchip/rk3399_grf.h index 775f8444bea8d..39cd44cec982f 100644 --- a/include/soc/rockchip/rk3399_grf.h +++ b/include/soc/rockchip/rk3399_grf.h @@ -12,5 +12,7 @@ /* PMU GRF Registers */ #define RK3399_PMUGRF_OS_REG2 0x308 #define RK3399_PMUGRF_OS_REG2_DDRTYPE GENMASK(15, 13) +#define RK3399_PMUGRF_OS_REG2_BW_CH0 GENMASK(3, 2) +#define RK3399_PMUGRF_OS_REG2_BW_CH1 GENMASK(19, 18) #endif diff --git a/include/soc/rockchip/rk3568_grf.h b/include/soc/rockchip/rk3568_grf.h index 575584e9d8834..52853efd6720e 100644 --- a/include/soc/rockchip/rk3568_grf.h +++ b/include/soc/rockchip/rk3568_grf.h @@ -4,6 +4,7 @@ #define RK3568_PMUGRF_OS_REG2 0x208 #define RK3568_PMUGRF_OS_REG2_DRAMTYPE_INFO GENMASK(15, 13) +#define RK3568_PMUGRF_OS_REG2_BW_CH0 GENMASK(3, 2) #define RK3568_PMUGRF_OS_REG3 0x20c #define RK3568_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3 GENMASK(13, 12)
The DFI is a unit which is suitable for measuring DDR utilization, but so far it could only be used as an event driver for the DDR frequency scaling driver. This adds perf support to the DFI driver. Usage with the 'perf' tool can look like: perf stat -a -e rockchip_ddr/cycles/,\ rockchip_ddr/read-bytes/,\ rockchip_ddr/write-bytes/,\ rockchip_ddr/bytes/ sleep 1 Performance counter stats for 'system wide': 1582524826 rockchip_ddr/cycles/ 1802.25 MB rockchip_ddr/read-bytes/ 1793.72 MB rockchip_ddr/write-bytes/ 3595.90 MB rockchip_ddr/bytes/ 1.014369709 seconds time elapsed perf support has been tested on a RK3568 and a RK3399, the latter with dual channel DDR. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> --- Notes: Changes since v5: - Add missing initialization of &dfi->last_perf_count Changes since v4: - use __stringify to ensure event type definitions and event numbers in sysfs are consistent - only use 64bit values in structs holding counters - support monitoring individual DDR channels - fix return value in rockchip_ddr_perf_event_init(): -EOPNOTSUPP -> -EINVAL - check for invalid event->attr.config values - start hrtimer to trigger in one second, not immediately - use devm_add_action_or_reset() - add suppress_bind_attrs - enable DDRMON during probe when perf is enabled - use a seqlock to protect perf reading the counters from the hrtimer callback modifying them drivers/devfreq/event/rockchip-dfi.c | 442 ++++++++++++++++++++++++++- include/soc/rockchip/rk3399_grf.h | 2 + include/soc/rockchip/rk3568_grf.h | 1 + 3 files changed, 440 insertions(+), 5 deletions(-)