diff options
| author | Babu Moger <babu.moger@amd.com> | 2025-11-13 03:57:30 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-11-22 00:35:22 +0300 |
| commit | 556d2892aa715286d840a74216c8fff885559261 (patch) | |
| tree | 50ef2833ec17f8e5255d2c1576817a5aa8c82bff /include/linux/resctrl.h | |
| parent | 7923ae7698cf9728501974d76d8ea712686281bc (diff) | |
| download | linux-556d2892aa715286d840a74216c8fff885559261.tar.xz | |
x86,fs/resctrl: Implement "io_alloc" enable/disable handlers
"io_alloc" is the generic name of the new resctrl feature that enables system
software to configure the portion of cache allocated for I/O traffic. On AMD
systems, "io_alloc" resctrl feature is backed by AMD's L3 Smart Data Cache
Injection Allocation Enforcement (SDCIAE).
Introduce the architecture-specific functions that resctrl fs should call to
enable, disable, or check status of the "io_alloc" feature. Change SDCIAE state
by setting (to enable) or clearing (to disable) bit 1 of
MSR_IA32_L3_QOS_EXT_CFG on all logical processors within the cache domain.
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://patch.msgid.link/9e9070100c320eab5368e088a3642443dee95ed7.1762995456.git.babu.moger@amd.com
Diffstat (limited to 'include/linux/resctrl.h')
| -rw-r--r-- | include/linux/resctrl.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index 533f240dbe21..54701668b3df 100644 --- a/include/linux/resctrl.h +++ b/include/linux/resctrl.h @@ -657,6 +657,27 @@ void resctrl_arch_reset_cntr(struct rdt_resource *r, struct rdt_mon_domain *d, u32 closid, u32 rmid, int cntr_id, enum resctrl_event_id eventid); +/** + * resctrl_arch_io_alloc_enable() - Enable/disable io_alloc feature. + * @r: The resctrl resource. + * @enable: Enable (true) or disable (false) io_alloc on resource @r. + * + * This can be called from any CPU. + * + * Return: + * 0 on success, <0 on error. + */ +int resctrl_arch_io_alloc_enable(struct rdt_resource *r, bool enable); + +/** + * resctrl_arch_get_io_alloc_enabled() - Get io_alloc feature state. + * @r: The resctrl resource. + * + * Return: + * true if io_alloc is enabled or false if disabled. + */ +bool resctrl_arch_get_io_alloc_enabled(struct rdt_resource *r); + extern unsigned int resctrl_rmid_realloc_threshold; extern unsigned int resctrl_rmid_realloc_limit; |