forked from mirrors/linux
3183e87c1b
Struct resctrl_schema holds properties that vary with the style of configuration that resctrl applies to a resource. There are already two values for the hardware's num_closid, depending on whether the architecture presents the L3 or L3CODE/L3DATA resources. As the way CDP changes the number of control groups that resctrl can create is part of the user-space interface, it should be managed by the filesystem parts of resctrl. This allows the architecture code to only describe the value the hardware supports. Add num_closid to resctrl_schema. This is the value seen by the filesystem, which may be different to the maximum value described by the arch code when CDP is enabled. These functions operate on the num_closid value that is exposed to user-space: * rdtgroup_parse_resource() * rdtgroup_schemata_show() * rdt_num_closids_show() * closid_init() Change them to use the schema value instead. schemata_list_create() sets this value, and reaches into the architecture-specific structure to get the value. This will eventually be replaced with a helper. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Jamie Iles <jamie@nuviainc.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Tested-by: Babu Moger <babu.moger@amd.com> Link: https://lkml.kernel.org/r/20210728170637.25610-8-james.morse@arm.com
185 lines
6 KiB
C
185 lines
6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _RESCTRL_H
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#define _RESCTRL_H
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/pid.h>
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#ifdef CONFIG_PROC_CPU_RESCTRL
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int proc_resctrl_show(struct seq_file *m,
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struct pid_namespace *ns,
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struct pid *pid,
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struct task_struct *tsk);
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#endif
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/**
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* enum resctrl_conf_type - The type of configuration.
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* @CDP_NONE: No prioritisation, both code and data are controlled or monitored.
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* @CDP_CODE: Configuration applies to instruction fetches.
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* @CDP_DATA: Configuration applies to reads and writes.
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*/
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enum resctrl_conf_type {
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CDP_NONE,
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CDP_CODE,
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CDP_DATA,
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};
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/**
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* struct rdt_domain - group of CPUs sharing a resctrl resource
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* @list: all instances of this resource
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* @id: unique id for this instance
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* @cpu_mask: which CPUs share this resource
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* @new_ctrl: new ctrl value to be loaded
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* @have_new_ctrl: did user provide new_ctrl for this domain
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* @rmid_busy_llc: bitmap of which limbo RMIDs are above threshold
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* @mbm_total: saved state for MBM total bandwidth
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* @mbm_local: saved state for MBM local bandwidth
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* @mbm_over: worker to periodically read MBM h/w counters
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* @cqm_limbo: worker to periodically read CQM h/w counters
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* @mbm_work_cpu: worker CPU for MBM h/w counters
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* @cqm_work_cpu: worker CPU for CQM h/w counters
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* @plr: pseudo-locked region (if any) associated with domain
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*/
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struct rdt_domain {
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struct list_head list;
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int id;
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struct cpumask cpu_mask;
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u32 new_ctrl;
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bool have_new_ctrl;
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unsigned long *rmid_busy_llc;
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struct mbm_state *mbm_total;
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struct mbm_state *mbm_local;
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struct delayed_work mbm_over;
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struct delayed_work cqm_limbo;
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int mbm_work_cpu;
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int cqm_work_cpu;
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struct pseudo_lock_region *plr;
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};
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/**
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* struct resctrl_cache - Cache allocation related data
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* @cbm_len: Length of the cache bit mask
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* @min_cbm_bits: Minimum number of consecutive bits to be set
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* @cbm_idx_mult: Multiplier of CBM index
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* @cbm_idx_offset: Offset of CBM index. CBM index is computed by:
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* closid * cbm_idx_multi + cbm_idx_offset
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* in a cache bit mask
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* @shareable_bits: Bitmask of shareable resource with other
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* executing entities
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* @arch_has_sparse_bitmaps: True if a bitmap like f00f is valid.
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* @arch_has_empty_bitmaps: True if the '0' bitmap is valid.
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* @arch_has_per_cpu_cfg: True if QOS_CFG register for this cache
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* level has CPU scope.
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*/
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struct resctrl_cache {
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unsigned int cbm_len;
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unsigned int min_cbm_bits;
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unsigned int cbm_idx_mult; // TODO remove this
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unsigned int cbm_idx_offset; // TODO remove this
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unsigned int shareable_bits;
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bool arch_has_sparse_bitmaps;
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bool arch_has_empty_bitmaps;
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bool arch_has_per_cpu_cfg;
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};
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/**
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* enum membw_throttle_mode - System's memory bandwidth throttling mode
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* @THREAD_THROTTLE_UNDEFINED: Not relevant to the system
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* @THREAD_THROTTLE_MAX: Memory bandwidth is throttled at the core
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* always using smallest bandwidth percentage
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* assigned to threads, aka "max throttling"
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* @THREAD_THROTTLE_PER_THREAD: Memory bandwidth is throttled at the thread
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*/
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enum membw_throttle_mode {
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THREAD_THROTTLE_UNDEFINED = 0,
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THREAD_THROTTLE_MAX,
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THREAD_THROTTLE_PER_THREAD,
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};
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/**
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* struct resctrl_membw - Memory bandwidth allocation related data
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* @min_bw: Minimum memory bandwidth percentage user can request
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* @bw_gran: Granularity at which the memory bandwidth is allocated
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* @delay_linear: True if memory B/W delay is in linear scale
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* @arch_needs_linear: True if we can't configure non-linear resources
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* @throttle_mode: Bandwidth throttling mode when threads request
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* different memory bandwidths
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* @mba_sc: True if MBA software controller(mba_sc) is enabled
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* @mb_map: Mapping of memory B/W percentage to memory B/W delay
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*/
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struct resctrl_membw {
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u32 min_bw;
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u32 bw_gran;
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u32 delay_linear;
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bool arch_needs_linear;
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enum membw_throttle_mode throttle_mode;
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bool mba_sc;
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u32 *mb_map;
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};
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struct rdt_parse_data;
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/**
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* struct rdt_resource - attributes of a resctrl resource
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* @rid: The index of the resource
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* @alloc_enabled: Is allocation enabled on this machine
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* @mon_enabled: Is monitoring enabled for this feature
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* @alloc_capable: Is allocation available on this machine
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* @mon_capable: Is monitor feature available on this machine
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* @num_rmid: Number of RMIDs available
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* @cache_level: Which cache level defines scope of this resource
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* @cache: Cache allocation related data
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* @membw: If the component has bandwidth controls, their properties.
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* @domains: All domains for this resource
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* @name: Name to use in "schemata" file.
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* @data_width: Character width of data when displaying
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* @default_ctrl: Specifies default cache cbm or memory B/W percent.
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* @format_str: Per resource format string to show domain value
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* @parse_ctrlval: Per resource function pointer to parse control values
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* @evt_list: List of monitoring events
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* @fflags: flags to choose base and info files
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*/
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struct rdt_resource {
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int rid;
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bool alloc_enabled;
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bool mon_enabled;
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bool alloc_capable;
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bool mon_capable;
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int num_rmid;
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int cache_level;
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struct resctrl_cache cache;
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struct resctrl_membw membw;
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struct list_head domains;
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char *name;
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int data_width;
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u32 default_ctrl;
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const char *format_str;
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int (*parse_ctrlval)(struct rdt_parse_data *data,
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struct rdt_resource *r,
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struct rdt_domain *d);
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struct list_head evt_list;
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unsigned long fflags;
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};
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/**
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* struct resctrl_schema - configuration abilities of a resource presented to
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* user-space
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* @list: Member of resctrl_schema_all.
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* @conf_type: Whether this schema is specific to code/data.
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* @res: The resource structure exported by the architecture to describe
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* the hardware that is configured by this schema.
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* @num_closid: The number of closid that can be used with this schema. When
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* features like CDP are enabled, this will be lower than the
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* hardware supports for the resource.
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*/
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struct resctrl_schema {
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struct list_head list;
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enum resctrl_conf_type conf_type;
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struct rdt_resource *res;
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int num_closid;
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};
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#endif /* _RESCTRL_H */
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