Messages in this thread Patch in this message | | | From | James Morse <> | Subject | [PATCH v5 06/21] x86/resctrl: Remove set_mba_sc()s control array re-initialisation | Date | Wed, 22 Jun 2022 16:46:14 +0000 |
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set_mba_sc() enables the 'software controller' to regulate the bandwidth based on the byte counters. This can be managed entirely in the parts of resctrl that move to /fs/, without any extra support from the architecture specific code. set_mba_sc() is called by rdt_enable_ctx() during mount and umount. It currently resets the arch code's ctrl_val[] and mbps_val[] arrays.
The ctrl_val[] was already reset when the domain was created, and by reset_all_ctrls() when the filesystem was last umounted. Doing the work in set_mba_sc() is not necessary as the values are already at their defaults due to the creation of the domain, or were previously reset during umount(), or are about to reset during umount().
Add a reset of the mbps_val[] in reset_all_ctrls(), allowing the code in set_mba_sc() that reaches in to the architecture specific structures to be removed.
Reviewed-by: Jamie Iles <quic_jiles@quicinc.com> Tested-by: Xin Hao <xhao@linux.alibaba.com> Reviewed-by: Shaopeng Tan <tan.shaopeng@fujitsu.com> Tested-by: Shaopeng Tan <tan.shaopeng@fujitsu.com> Tested-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: James Morse <james.morse@arm.com> --- Changes since v3: * Spelling mistakes in commit message.
Changes since v2: * Moved earlier in the series, added the reset in reset_all_ctrls(). * Rephrased commit message. --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 5830905a92d2..b32ceff8325a 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -1898,18 +1898,12 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r) static int set_mba_sc(bool mba_sc) { struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl; - struct rdt_hw_domain *hw_dom; - struct rdt_domain *d; if (!is_mbm_enabled() || !is_mba_linear() || mba_sc == is_mba_sc(r)) return -EINVAL; r->membw.mba_sc = mba_sc; - list_for_each_entry(d, &r->domains, list) { - hw_dom = resctrl_to_arch_dom(d); - setup_default_ctrlval(r, hw_dom->ctrl_val, hw_dom->mbps_val); - } return 0; } @@ -2327,8 +2321,10 @@ static int reset_all_ctrls(struct rdt_resource *r) hw_dom = resctrl_to_arch_dom(d); cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask); - for (i = 0; i < hw_res->num_closid; i++) + for (i = 0; i < hw_res->num_closid; i++) { hw_dom->ctrl_val[i] = r->default_ctrl; + hw_dom->mbps_val[i] = MBA_MAX_MBPS; + } } cpu = get_cpu(); /* Update CBM on this cpu if it's in cpu_mask. */ -- 2.30.2
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