github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-23 06:31:58 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

x86/resctrl: Refactor resctrl_arch_rmid_read()

Browse Source 
resctrl_arch_rmid_read() adjusts the value obtained from MSR_IA32_QM_CTR to
account for the overflow for MBM events and apply counter scaling for all the
events. This logic is common to both reading an RMID and reading a hardware
counter directly.

Refactor the hardware value adjustment logic into get_corrected_val() to
prepare for support of reading a hardware counter.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
This commit is contained in:
Babu Moger 2025-09-05 16:34:20 -05:00 committed by Borislav Petkov (AMD)
parent 862314fd1f
commit 7c9ac605e2
1 changed files with 23 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
arch/x86/kernel/cpu/resctrl/monitor.c
View File

@ -217,24 +217,13 @@ static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
return chunks >> shift;
}
int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
u32 unused, u32 rmid, enum resctrl_event_id eventid,
u64 *val, void *ignored)
static u64 get_corrected_val(struct rdt_resource *r, struct rdt_mon_domain *d,
u32 rmid, enum resctrl_event_id eventid, u64 msr_val)
{
struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
int cpu = cpumask_any(&d->hdr.cpu_mask);
struct arch_mbm_state *am;
u64 msr_val, chunks;
u32 prmid;
int ret;
resctrl_arch_rmid_read_context_check();
prmid = logical_rmid_to_physical_rmid(cpu, rmid);
ret = __rmid_read_phys(prmid, eventid, &msr_val);
if (ret)
return ret;
u64 chunks;
am = get_arch_mbm_state(hw_dom, rmid, eventid);
if (am) {
@ -246,7 +235,26 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
chunks = msr_val;
}
*val = chunks * hw_res->mon_scale;
return chunks * hw_res->mon_scale;
}
int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
u32 unused, u32 rmid, enum resctrl_event_id eventid,
u64 *val, void *ignored)
{
int cpu = cpumask_any(&d->hdr.cpu_mask);
u64 msr_val;
u32 prmid;
int ret;
resctrl_arch_rmid_read_context_check();
prmid = logical_rmid_to_physical_rmid(cpu, rmid);
ret = __rmid_read_phys(prmid, eventid, &msr_val);
if (ret)
return ret;
*val = get_corrected_val(r, d, rmid, eventid, msr_val);
return 0;
}