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Initialize the resctrl_kmode data structure and add resctrl_set_kmode_support() to allow architecture to register its supported kernel modes. This is preparatory infrastructure for future kernel mode support in resctrl. Signed-off-by: Babu Moger --- v7: Moved the static initialization for resctrl_kmode in here as it is used here first. Updated the changelog and code comments. v6: Use resctrl_kmode.kmode_sup after the struct flatten. Drop duplicate kernel-doc from the .c definition and place the function next to resctrl_kmode_init(). Rewrite changelog (not a bugfix). v5: New patch split from resctrl_kmode_cfg initialization. Register modes in resctrl_kmode_cfg.caps.kmode_sup using RESCTRL_INHERIT_USER and RESCTRL_ASSIGN_GLOBAL_ENABLE_PER_CPU. Ignore out-of-range mode values. v4: New patch to initialize supported kernel modes. https://lore.kernel.org/lkml/737a4228-52fb-4583-ac64-8efe79c107e6@intel.com/ --- fs/resctrl/rdtgroup.c | 14 ++++++++++++++ include/linux/resctrl.h | 12 ++++++++++++ 2 files changed, 26 insertions(+) diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index 443b41a4d467..28bd4c4d98f2 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -76,6 +76,14 @@ static void rdtgroup_destroy_root(void); struct dentry *debugfs_resctrl; +static struct resctrl_kmode_cfg resctrl_kmode = { + .supported = { BIT(RESCTRL_INHERIT_USER) }, + .active = RESCTRL_INHERIT_USER, + .ctrl = KMODE_ASSIGN, + .mon = KMODE_ASSIGN, + .rdtgrp = NULL, +}; + /* * Memory bandwidth monitoring event to use for the default CTRL_MON group * and each new CTRL_MON group created by the user. Only relevant when @@ -2297,6 +2305,12 @@ static void io_alloc_init(void) } } +void resctrl_set_kmode_support(enum resctrl_kernel_mode kmode) +{ + if (kmode < RESCTRL_NUM_KERNEL_MODES) + __set_bit(kmode, resctrl_kmode.supported); +} + void resctrl_file_fflags_init(const char *config, unsigned long fflags) { struct rftype *rft; diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index e43415ae6e0e..519c28c63bc7 100644 --- a/include/linux/resctrl.h +++ b/include/linux/resctrl.h @@ -741,6 +741,18 @@ enum resctrl_kernel_mode { #define RESCTRL_NUM_KERNEL_MODES (RESCTRL_KMODE_LAST + 1) +/** + * resctrl_set_kmode_support() - Register a supported kernel mode + * @kmode: Kernel mode supported by the architecture. + * + * %RESCTRL_INHERIT_USER is a default mode and does not need to be + * registered. + * + * Architectures use this interface during resctrl initialization to + * advertise supported kernel modes. + */ +void resctrl_set_kmode_support(enum resctrl_kernel_mode kmode); + /** * resctrl_arch_configure_kmode_global() - Program RESCTRL_GLOBAL_ENABLE_PER_CPU * -- 2.43.0