From: Reinette Chatre <reinette.chatre@intel.com>
To: James Morse <james.morse@arm.com>, <x86@kernel.org>,
<linux-kernel@vger.kernel.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
H Peter Anvin <hpa@zytor.com>, Babu Moger <Babu.Moger@amd.com>,
<shameerali.kolothum.thodi@huawei.com>,
Jamie Iles <jamie@nuviainc.com>,
"D Scott Phillips OS" <scott@os.amperecomputing.com>,
<lcherian@marvell.com>, <bobo.shaobowang@huawei.com>,
<tan.shaopeng@fujitsu.com>
Subject: Re: [PATCH v2 18/23] x86/resctrl: Pass the required parameters into resctrl_arch_rmid_read()
Date: Fri, 15 Oct 2021 15:30:09 -0700 [thread overview]
Message-ID: <0d3d0869-c303-2411-ab74-76f7e06f9721@intel.com> (raw)
In-Reply-To: <20211001160302.31189-19-james.morse@arm.com>
Hi James,
On 10/1/2021 9:02 AM, James Morse wrote:
> 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 hardware register. Currently the function
> returns the mbm values in chunks directly from hardware.
>
> To convert this to bytes, some correction and overflow calculations
> are needed. These depend on the resource and domain structures.
> Overflow detection requires the old chunks value. None of this
> is available to resctrl_arch_rmid_read(). MPAM requires the
> resource and domain structures to find the MMIO device that holds
> the registers.
>
> Pass the resource and domain to resctrl_arch_rmid_read(). This make
> rmid_dirty() to big, instead merge it with its only caller, the name is
to big -> too big
> kept as a local variable.
>
> Signed-off-by: James Morse <james.morse@arm.com>
> ---
> This is all a little noisy for __mon_event_count(), as the switch
> statement work is now before the resctrl_arch_rmid_read() call.
> ---
> arch/x86/kernel/cpu/resctrl/monitor.c | 31 +++++++++++++++------------
> include/linux/resctrl.h | 15 ++++++++++++-
> 2 files changed, 31 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
> index cf35eaf01042..f833bc01aeac 100644
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -167,10 +167,14 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
> memset(am, 0, sizeof(*am));
> }
>
> -int resctrl_arch_rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *val)
> +int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
Please do not use tabs in the function parameters.
> + u32 rmid, enum resctrl_event_id eventid, u64 *val)
> {
> u64 msr_val;
>
> + if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
> + return -EINVAL;
> +
> /*
> * As per the SDM, when IA32_QM_EVTSEL.EvtID (bits 7:0) is configured
> * with a valid event code for supported resource type and the bits
> @@ -192,16 +196,6 @@ int resctrl_arch_rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *val)
> return 0;
> }
>
> -static bool rmid_dirty(struct rmid_entry *entry)
> -{
> - u64 val = 0;
> -
> - if (resctrl_arch_rmid_read(entry->rmid, QOS_L3_OCCUP_EVENT_ID, &val))
> - return true;
> -
> - return val >= resctrl_cqm_threshold;
> -}
> -
> /*
> * Check the RMIDs that are marked as busy for this domain. If the
> * reported LLC occupancy is below the threshold clear the busy bit and
> @@ -213,6 +207,8 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
> struct rmid_entry *entry;
> struct rdt_resource *r;
> u32 crmid = 1, nrmid;
> + bool rmid_dirty;
> + u64 val = 0;
>
> r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
>
> @@ -228,7 +224,14 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
> break;
>
> entry = __rmid_entry(nrmid);
> - if (force_free || !rmid_dirty(entry)) {
> +
> + if (resctrl_arch_rmid_read(r, d, entry->rmid,
> + QOS_L3_OCCUP_EVENT_ID, &val))
> + rmid_dirty = true;
> + else
> + rmid_dirty = (val >= resctrl_cqm_threshold);
> +
> + if (force_free || !rmid_dirty) {
> clear_bit(entry->rmid, d->rmid_busy_llc);
> if (!--entry->busy) {
> rmid_limbo_count--;
> @@ -278,7 +281,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
> cpu = get_cpu();
> list_for_each_entry(d, &r->domains, list) {
> if (cpumask_test_cpu(cpu, &d->cpu_mask)) {
> - err = resctrl_arch_rmid_read(entry->rmid,
> + err = resctrl_arch_rmid_read(r, d, entry->rmid,
> QOS_L3_OCCUP_EVENT_ID,
> &val);
> if (err || val <= resctrl_cqm_threshold)
> @@ -336,7 +339,7 @@ static u64 __mon_event_count(u32 rmid, struct rmid_read *rr)
> if (rr->first)
> resctrl_arch_reset_rmid(rr->r, rr->d, rmid, rr->evtid);
>
> - rr->err = resctrl_arch_rmid_read(rmid, rr->evtid, &tval);
> + rr->err = resctrl_arch_rmid_read(rr->r, rr->d, rmid, rr->evtid, &tval);
> if (rr->err)
> return rr->err;
>
> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
> index 01bdd8be590b..4215a0564206 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -218,7 +218,20 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
> u32 closid, enum resctrl_conf_type type);
> int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d);
> void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d);
> -int resctrl_arch_rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *res);
> +
> +/**
> + * resctrl_arch_rmid_read() - Read the eventid counter correpsonding to rmid
correpsonding -> corresponding
> + * for this resource and domain.
> + * @r: The resource that the counter should be read from.
> + * @d: The domain that the counter should be read from.
> + * @rmid: The rmid of the counter to read.
> + * @eventid: The eventid to read, e.g. L3 occupancy.
> + * @val: The result of the counter read in chunks.
> + *
"The" prefix can be removed from all descriptions to match style of
other descriptions, also in description of resctrl_arch_rmid_read() below.
> + * Returns 0 on success, or -EIO, -EINVAL etc on error.
I do not think this is valid kernel doc for the return section.
> + */
> +int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
> + u32 rmid, enum resctrl_event_id eventid, u64 *val);
>
> /**
> * resctrl_arch_reset_rmid() - Reset any private state associated with rmid
>
Reinette
next prev parent reply other threads:[~2021-10-15 22:30 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 16:02 [PATCH v2 00/23] x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes James Morse
2021-10-01 16:02 ` [PATCH v2 01/23] x86/resctrl: Free the ctrlval arrays when domain_setup_mon_state() fails James Morse
2021-10-01 16:02 ` [PATCH v2 02/23] x86/resctrl: Fix kfree() of the wrong type in domain_add_cpu() James Morse
2021-10-01 16:02 ` [PATCH v2 03/23] x86/resctrl: Kill off alloc_enabled James Morse
2021-10-15 22:19 ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 04/23] x86/resctrl: Merge mon_capable and mon_enabled James Morse
2021-10-19 23:18 ` Babu Moger
2021-10-22 18:30 ` James Morse
2021-10-01 16:02 ` [PATCH v2 05/23] x86/resctrl: Add domain online callback for resctrl work James Morse
2021-10-15 22:19 ` Reinette Chatre
2021-10-22 18:30 ` James Morse
2021-10-19 23:19 ` Babu Moger
2021-10-22 18:30 ` James Morse
2021-10-01 16:02 ` [PATCH v2 06/23] x86/resctrl: Group struct rdt_hw_domain cleanup James Morse
2021-10-01 16:02 ` [PATCH v2 07/23] x86/resctrl: Add domain offline callback for resctrl work James Morse
2021-10-19 23:19 ` Babu Moger
2021-10-22 18:30 ` James Morse
2021-10-01 16:02 ` [PATCH v2 08/23] x86/resctrl: Create mba_sc configuration in the rdt_domain James Morse
2021-10-15 22:26 ` Reinette Chatre
2021-10-22 18:30 ` James Morse
2021-10-01 16:02 ` [PATCH v2 09/23] x86/resctrl: Switch over to the resctrl mbps_val list James Morse
2021-10-15 22:26 ` Reinette Chatre
2021-10-27 16:49 ` James Morse
2021-10-01 16:02 ` [PATCH v2 10/23] x86/resctrl: Remove architecture copy of mbps_val James Morse
2021-10-15 22:27 ` Reinette Chatre
2021-10-27 16:49 ` James Morse
2021-10-01 16:02 ` [PATCH v2 11/23] x86/resctrl: Remove set_mba_sc()s control array re-initialisation James Morse
2021-10-01 16:02 ` [PATCH v2 12/23] x86/resctrl: Abstract and use supports_mba_mbps() James Morse
2021-10-07 6:13 ` tan.shaopeng
2021-10-27 16:50 ` James Morse
2021-10-15 22:28 ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 13/23] x86/resctrl: Allow update_mba_bw() to update controls directly James Morse
2021-10-15 22:28 ` Reinette Chatre
2021-10-27 16:49 ` James Morse
2021-10-01 16:02 ` [PATCH v2 14/23] x86/resctrl: Calculate bandwidth from the previous __mon_event_count() chunks James Morse
2021-10-15 22:28 ` Reinette Chatre
2021-10-27 16:50 ` James Morse
2021-10-27 20:41 ` Reinette Chatre
2021-10-29 15:50 ` James Morse
2021-10-29 22:22 ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 15/23] x86/recstrl: Add per-rmid arch private storage for overflow and chunks James Morse
2021-10-15 22:29 ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 16/23] x86/recstrl: Allow per-rmid arch private storage to be reset James Morse
2021-10-07 6:16 ` tan.shaopeng
2021-10-01 16:02 ` [PATCH v2 17/23] x86/resctrl: Abstract __rmid_read() James Morse
2021-10-15 22:29 ` Reinette Chatre
2021-10-19 23:20 ` Babu Moger
2021-10-20 18:15 ` Reinette Chatre
2021-10-20 19:22 ` Babu Moger
2021-10-20 20:28 ` Reinette Chatre
2021-10-27 16:50 ` James Morse
2021-10-27 18:59 ` Babu Moger
2021-10-01 16:02 ` [PATCH v2 18/23] x86/resctrl: Pass the required parameters into resctrl_arch_rmid_read() James Morse
2021-10-15 22:30 ` Reinette Chatre [this message]
2021-10-01 16:02 ` [PATCH v2 19/23] x86/resctrl: Move mbm_overflow_count() " James Morse
2021-10-01 16:02 ` [PATCH v2 20/23] x86/resctrl: Move get_corrected_mbm_count() " James Morse
2021-10-01 16:03 ` [PATCH v2 21/23] x86/resctrl: Rename and change the units of resctrl_cqm_threshold James Morse
2021-10-01 16:03 ` [PATCH v2 22/23] x86/resctrl: Add resctrl_rmid_realloc_limit to abstract x86's boot_cpu_data James Morse
2021-10-01 16:03 ` [PATCH v2 23/23] x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes James Morse
2021-10-13 2:09 ` [PATCH v2 00/23] " tan.shaopeng
2021-10-19 23:17 ` Babu Moger
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