From: James Morse james.morse@arm.com
maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/...
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Expand the probing support with the control and monitor types we can use with resctrl.
Signed-off-by: James Morse james.morse@arm.com Signed-off-by: Zeng Heng zengheng4@huawei.com --- drivers/platform/mpam/mpam_devices.c | 79 ++++++++++++++++++++++++++- drivers/platform/mpam/mpam_internal.h | 50 +++++++++++++++++ 2 files changed, 127 insertions(+), 2 deletions(-)
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c index ec22c279cfe9..7eeeb44506b1 100644 --- a/drivers/platform/mpam/mpam_devices.c +++ b/drivers/platform/mpam/mpam_devices.c @@ -83,7 +83,7 @@ LIST_HEAD(mpam_classes);
static u32 __mpam_read_reg(struct mpam_msc *msc, u16 reg) { - WARN_ON_ONCE(reg > msc->mapped_hwpage_sz); + WARN_ON_ONCE(reg + sizeof(u32) > msc->mapped_hwpage_sz); WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
return readl_relaxed(msc->mapped_hwpage + reg); @@ -91,7 +91,7 @@ static u32 __mpam_read_reg(struct mpam_msc *msc, u16 reg)
static void __mpam_write_reg(struct mpam_msc *msc, u16 reg, u32 val) { - WARN_ON_ONCE(reg > msc->mapped_hwpage_sz); + WARN_ON_ONCE(reg + sizeof(u32) > msc->mapped_hwpage_sz); WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
writel_relaxed(val, msc->mapped_hwpage + reg); @@ -516,6 +516,74 @@ static struct mpam_msc_ris *mpam_get_or_create_ris(struct mpam_msc *msc, return found; }
+static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) +{ + int err; + struct mpam_msc *msc = ris->msc; + struct mpam_props *props = &ris->props; + + lockdep_assert_held(&msc->lock); + lockdep_assert_held(&msc->part_sel_lock); + + /* Cache Portion partitioning */ + if (FIELD_GET(MPAMF_IDR_HAS_CPOR_PART, ris->idr)) { + u32 cpor_features = mpam_read_partsel_reg(msc, CPOR_IDR); + + props->cpbm_wd = FIELD_GET(MPAMF_CPOR_IDR_CPBM_WD, cpor_features); + if (props->cpbm_wd) + mpam_set_feature(mpam_feat_cpor_part, props); + } + + /* Memory bandwidth partitioning */ + if (FIELD_GET(MPAMF_IDR_HAS_MBW_PART, ris->idr)) { + u32 mbw_features = mpam_read_partsel_reg(msc, MBW_IDR); + + /* portion bitmap resolution */ + props->mbw_pbm_bits = FIELD_GET(MPAMF_MBW_IDR_BWPBM_WD, mbw_features); + if (props->mbw_pbm_bits && + FIELD_GET(MPAMF_MBW_IDR_HAS_PBM, mbw_features)) + mpam_set_feature(mpam_feat_mbw_part, props); + + props->bwa_wd = FIELD_GET(MPAMF_MBW_IDR_BWA_WD, mbw_features); + if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features)) + mpam_set_feature(mpam_feat_mbw_max, props); + } + + /* Performance Monitoring */ + if (FIELD_GET(MPAMF_IDR_HAS_MSMON, ris->idr)) { + u32 msmon_features = mpam_read_partsel_reg(msc, MSMON_IDR); + + if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_CSU, msmon_features)) { + u32 csumonidr, discard; + + /* + * If the firmware max-nrdy-us property is missing, the + * CSU counters can't be used. Should we wait forever? + */ + err = device_property_read_u32(&msc->pdev->dev, + "arm,not-ready-us", + &discard); + + csumonidr = mpam_read_partsel_reg(msc, CSUMON_IDR); + props->num_csu_mon = FIELD_GET(MPAMF_CSUMON_IDR_NUM_MON, csumonidr); + if (props->num_csu_mon && !err) + mpam_set_feature(mpam_feat_msmon_csu, props); + else if (props->num_csu_mon) + pr_err_once("Counters are not usable because not-ready timeout was not provided by firmware."); + } + if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_MBWU, msmon_features)) { + u32 mbwumonidr = mpam_read_partsel_reg(msc, MBWUMON_IDR); + + props->num_mbwu_mon = FIELD_GET(MPAMF_MBWUMON_IDR_NUM_MON, mbwumonidr); + if (props->num_mbwu_mon) + mpam_set_feature(mpam_feat_msmon_mbwu, props); + + if (FIELD_GET(MPAMF_MBWUMON_IDR_HAS_RWBW, mbwumonidr)) + mpam_set_feature(mpam_feat_msmon_mbwu_rwbw, props); + } + } +} + static int mpam_msc_hw_probe(struct mpam_msc *msc) { u64 idr; @@ -536,6 +604,7 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc)
idr = mpam_msc_read_idr(msc); spin_unlock(&msc->part_sel_lock); + msc->ris_max = FIELD_GET(MPAMF_IDR_RIS_MAX, idr);
/* Use these values so partid/pmg always starts with a valid value */ @@ -557,6 +626,12 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc) if (IS_ERR(ris)) { return PTR_ERR(ris); } + ris->idr = idr; + + spin_lock(&msc->part_sel_lock); + __mpam_part_sel(ris_idx, 0, msc); + mpam_ris_hw_probe(ris); + spin_unlock(&msc->part_sel_lock); }
spin_lock(&partid_max_lock); diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h index a7de4a69b9f8..71e62594876d 100644 --- a/drivers/platform/mpam/mpam_internal.h +++ b/drivers/platform/mpam/mpam_internal.h @@ -49,6 +49,54 @@ struct mpam_msc size_t mapped_hwpage_sz; };
+/* + * When we compact the supported features, we don't care what they are. + * Storing them as a bitmap makes life easy. + */ +typedef u16 mpam_features_t; + +/* Bits for mpam_features_t */ +enum mpam_device_features { + mpam_feat_ccap_part = 0, + mpam_feat_cpor_part, + mpam_feat_mbw_part, + mpam_feat_mbw_min, + mpam_feat_mbw_max, + mpam_feat_mbw_prop, + mpam_feat_msmon, + mpam_feat_msmon_csu, + mpam_feat_msmon_csu_capture, + mpam_feat_msmon_mbwu, + mpam_feat_msmon_mbwu_capture, + mpam_feat_msmon_mbwu_rwbw, + mpam_feat_msmon_capt, + MPAM_FEATURE_LAST, +}; +#define MPAM_ALL_FEATURES ((1<<MPAM_FEATURE_LAST) - 1) + +struct mpam_props +{ + mpam_features_t features; + + u16 cpbm_wd; + u16 mbw_pbm_bits; + u8 bwa_wd; + u16 num_csu_mon; + u16 num_mbwu_mon; +}; + +static inline bool mpam_has_feature(enum mpam_device_features feat, + struct mpam_props *props) +{ + return (1<<feat) & props->features; +} + +static inline void mpam_set_feature(enum mpam_device_features feat, + struct mpam_props *props) +{ + props->features |= (1<<feat); +} + struct mpam_class { /* mpam_components in this class */ @@ -82,6 +130,8 @@ struct mpam_component struct mpam_msc_ris { u8 ris_idx; + u64 idr; + struct mpam_props props;
cpumask_t affinity;