From: James Morse <james.morse@arm.com>
To: x86@kernel.org, linux-kernel@vger.kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>,
Reinette Chatre <reinette.chatre@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>,
James Morse <james.morse@arm.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
Subject: [PATCH v1 17/20] x86/resctrl: Move get_corrected_mbm_count() into resctrl_arch_rmid_read()
Date: Thu, 29 Jul 2021 22:36:07 +0000 [thread overview]
Message-ID: <20210729223610.29373-18-james.morse@arm.com> (raw)
In-Reply-To: <20210729223610.29373-1-james.morse@arm.com>
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@arm.com>
---
arch/x86/kernel/cpu/resctrl/internal.h | 4 ++--
arch/x86/kernel/cpu/resctrl/monitor.c | 15 ++++++---------
2 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 2d0a6bba4a01..65b472d6b146 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -279,14 +279,12 @@ 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 when 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;
@@ -296,9 +294,11 @@ 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 for this RMID last time we read it
*/
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 39f7e74a4236..9321c758752a 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -201,7 +201,9 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
m = get_arch_mbm_state(hw_dom, rmid, eventid);
if (m) {
- *val = mbm_overflow_count(m->prev_msr, msr_val, hw_res->mbm_width);
+ m->chunks += mbm_overflow_count(m->prev_msr, msr_val,
+ hw_res->mbm_width);
+ *val = get_corrected_mbm_count(rmid, m->chunks);
m->prev_msr = msr_val;
} else {
*val = msr_val;
@@ -366,9 +368,7 @@ 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;
}
@@ -381,14 +381,11 @@ static void mbm_bw_count(u32 rmid, struct rmid_read *rr)
{
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(rr->r);
struct mbm_state *m = &rr->d->mbm_local[rmid];
- u64 tval = 0, cur_bw, bw_chunks;
+ u64 cur_bw, bw_chunks = 0;
- if (resctrl_arch_rmid_read(rr->r, rr->d, rmid, rr->evtid, &tval))
+ if (resctrl_arch_rmid_read(rr->r, rr->d, rmid, rr->evtid, &bw_chunks))
return;
- m->chunks += tval;
- bw_chunks = get_corrected_mbm_count(rmid, m->chunks);
-
cur_bw = (bw_chunks - m->prev_bw_chunks) * hw_res->mon_scale;
cur_bw >>= 20;
--
2.30.2
next prev parent reply other threads:[~2021-07-29 22:38 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 22:35 [PATCH v1 00/20] x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes James Morse
2021-07-29 22:35 ` [PATCH v1 01/20] x86/resctrl: Kill off alloc_enabled James Morse
2021-08-11 12:12 ` Jamie Iles
2021-09-01 21:18 ` Reinette Chatre
2021-07-29 22:35 ` [PATCH v1 02/20] x86/resctrl: Merge mon_capable and mon_enabled James Morse
2021-08-11 12:15 ` Jamie Iles
2021-08-11 15:16 ` James Morse
2021-07-29 22:35 ` [PATCH v1 03/20] x86/resctrl: Add domain online callback for resctrl work James Morse
2021-09-01 21:19 ` Reinette Chatre
2021-09-17 16:57 ` James Morse
2021-07-29 22:35 ` [PATCH v1 04/20] x86/resctrl: Add domain offline " James Morse
2021-08-11 16:10 ` Jamie Iles
2021-09-01 21:21 ` Reinette Chatre
2021-07-29 22:35 ` [PATCH v1 05/20] x86/resctrl: Create mba_sc configuration in the rdt_domain James Morse
2021-08-11 16:32 ` Jamie Iles
2021-08-31 16:24 ` James Morse
2021-09-01 21:22 ` Reinette Chatre
2021-09-17 16:57 ` James Morse
2021-07-29 22:35 ` [PATCH v1 06/20] x86/resctrl: Switch over to the resctrl mbps_val list James Morse
2021-09-01 21:25 ` Reinette Chatre
2021-09-17 16:57 ` James Morse
2021-09-17 18:20 ` Reinette Chatre
2021-10-01 16:02 ` James Morse
2021-07-29 22:35 ` [PATCH v1 07/20] x86/resctrl: Remove architecture copy of mbps_val James Morse
2021-09-01 21:26 ` Reinette Chatre
2021-09-17 16:57 ` James Morse
2021-07-29 22:35 ` [PATCH v1 08/20] x86/resctrl: Remove set_mba_sc()s control array re-initialisation James Morse
2021-07-29 22:35 ` [PATCH v1 09/20] x86/resctrl: Abstract and use supports_mba_mbps() James Morse
2021-09-01 21:27 ` Reinette Chatre
2021-09-17 16:57 ` James Morse
2021-09-24 6:23 ` tan.shaopeng
2021-10-01 16:01 ` James Morse
2021-07-29 22:36 ` [PATCH v1 10/20] x86/resctrl: Allow update_mba_bw() to update controls directly James Morse
2021-09-01 21:28 ` Reinette Chatre
2021-07-29 22:36 ` [PATCH v1 11/20] x86/resctrl: Calculate bandwidth from the total bytes counter James Morse
2021-09-01 21:31 ` Reinette Chatre
2021-09-17 16:58 ` James Morse
2021-07-29 22:36 ` [PATCH v1 12/20] x86/recstrl: Add per-rmid arch private storage for overflow and chunks James Morse
2021-08-11 17:14 ` Jamie Iles
2021-08-31 16:25 ` James Morse
2021-07-29 22:36 ` [PATCH v1 13/20] x86/recstrl: Allow per-rmid arch private storage to be reset James Morse
2021-09-24 6:34 ` tan.shaopeng
2021-10-01 16:01 ` James Morse
2021-07-29 22:36 ` [PATCH v1 14/20] x86/resctrl: Abstract __rmid_read() James Morse
2021-07-29 22:36 ` [PATCH v1 15/20] x86/resctrl: Pass the required parameters into resctrl_arch_rmid_read() James Morse
2021-07-29 22:36 ` [PATCH v1 16/20] x86/resctrl: Move mbm_overflow_count() " James Morse
2021-07-29 22:36 ` James Morse [this message]
2021-07-29 22:36 ` [PATCH v1 18/20] x86/resctrl: Rename and change the units of resctrl_cqm_threshold James Morse
2021-07-29 22:36 ` [PATCH v1 19/20] x86/resctrl: Add resctrl_rmid_realloc_limit to abstract x86's boot_cpu_data James Morse
2021-07-29 22:36 ` [PATCH v1 20/20] x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes James Morse
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