The following commit has been merged into the x86/cache branch of tip: Commit-ID: 38f72f50d6498ee60ac89deff3686e34ce0c2a32 Gitweb: https://git.kernel.org/tip/38f72f50d6498ee60ac89deff3686e34ce0c2a32 Author: James Morse <james.morse@xxxxxxx> AuthorDate: Fri, 02 Sep 2022 15:48:26 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Fri, 23 Sep 2022 14:22:53 +02:00 x86/resctrl: Move get_corrected_mbm_count() into resctrl_arch_rmid_read() resctrl_arch_rmid_read() is intended as the function that an architecture agnostic resctrl filesystem driver can use to read a value in bytes from a counter. Currently the function returns the MBM values in chunks directly from hardware. When reading a bandwidth counter, get_corrected_mbm_count() must be used to correct the value read. get_corrected_mbm_count() is architecture specific, this work should be done in resctrl_arch_rmid_read(). Move the function calls. This allows the resctrl filesystems's chunks value to be removed in favour of the architecture private version. Signed-off-by: James Morse <james.morse@xxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Reviewed-by: Jamie Iles <quic_jiles@xxxxxxxxxxx> Reviewed-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxx> Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx> Tested-by: Xin Hao <xhao@xxxxxxxxxxxxxxxxx> Tested-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxx> Tested-by: Cristian Marussi <cristian.marussi@xxxxxxx> Link: https://lore.kernel.org/r/20220902154829.30399-19-james.morse@xxxxxxx --- arch/x86/kernel/cpu/resctrl/internal.h | 4 ++-- arch/x86/kernel/cpu/resctrl/monitor.c | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h index 8039e8a..bdb55c2 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -280,14 +280,12 @@ struct rftype { /** * struct mbm_state - status for each MBM counter in each domain - * @chunks: Total data moved (multiply by rdt_group.mon_scale to get bytes) * @prev_bw_chunks: Previous chunks value read for bandwidth calculation * @prev_bw: The most recent bandwidth in MBps * @delta_bw: Difference between the current and previous bandwidth * @delta_comp: Indicates whether to compute the delta_bw */ struct mbm_state { - u64 chunks; u64 prev_bw_chunks; u32 prev_bw; u32 delta_bw; @@ -297,10 +295,12 @@ struct mbm_state { /** * struct arch_mbm_state - values used to compute resctrl_arch_rmid_read()s * return value. + * @chunks: Total data moved (multiply by rdt_group.mon_scale to get bytes) * @prev_msr: Value of IA32_QM_CTR last time it was read for the RMID used to * find this struct. */ struct arch_mbm_state { + u64 chunks; u64 prev_msr; }; diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c index 862a446..27bb494 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -204,7 +204,9 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d, am = get_arch_mbm_state(hw_dom, rmid, eventid); if (am) { - *val = mbm_overflow_count(am->prev_msr, msr_val, hw_res->mbm_width); + am->chunks += mbm_overflow_count(am->prev_msr, msr_val, + hw_res->mbm_width); + *val = get_corrected_mbm_count(rmid, am->chunks); am->prev_msr = msr_val; } else { *val = msr_val; @@ -374,9 +376,7 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr) return 0; } - m->chunks += tval; - - rr->val += get_corrected_mbm_count(rmid, m->chunks); + rr->val += tval; return 0; }
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