diff options
| author | James Morse <james.morse@arm.com> | 2025-11-19 12:22:48 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2025-11-19 18:34:21 +0000 |
| commit | f188a36ca2416e8090453eacbabd2925b20eb906 (patch) | |
| tree | 8d139142188aa0bac40f44c628718df27bc4f772 /drivers/resctrl/mpam_internal.h | |
| parent | c10ca83a778304f976cbea60bbbb2f1fac003f5c (diff) | |
arm_mpam: Reset MSC controls from cpuhp callbacks
When a CPU comes online, it may bring a newly accessible MSC with
it. Only the default partid has its value reset by hardware, and
even then the MSC might not have been reset since its config was
previously dirtied. e.g. Kexec.
Any in-use partid must have its configuration restored, or reset.
In-use partids may be held in caches and evicted later.
MSC are also reset when CPUs are taken offline to cover cases where
firmware doesn't reset the MSC over reboot using UEFI, or kexec
where there is no firmware involvement.
If the configuration for a RIS has not been touched since it was
brought online, it does not need resetting again.
To reset, write the maximum values for all discovered controls.
CC: Rohit Mathew <Rohit.Mathew@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/resctrl/mpam_internal.h')
| -rw-r--r-- | drivers/resctrl/mpam_internal.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h index 4749ac223adc..dec485cd8a91 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -5,6 +5,7 @@ #define MPAM_INTERNAL_H #include <linux/arm_mpam.h> +#include <linux/atomic.h> #include <linux/bitmap.h> #include <linux/cpumask.h> #include <linux/io.h> @@ -45,6 +46,7 @@ struct mpam_msc { enum mpam_msc_iface iface; u32 nrdy_usec; cpumask_t accessibility; + atomic_t online_refs; /* * probe_lock is only taken during discovery. After discovery these @@ -198,6 +200,7 @@ struct mpam_msc_ris { u8 ris_idx; u64 idr; struct mpam_props props; + bool in_reset_state; cpumask_t affinity; |