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authorJames Morse <james.morse@arm.com>2021-07-28 17:06:14 +0000
committerBorislav Petkov <bp@suse.de>2021-08-11 11:51:34 +0200
commit63c8b1231929b8aa80abc753c1c91b6b49e2c0b0 (patch)
tree697c959a7f6ddc242cc8a1ca2195ad0b4fee8db2 /include/linux/resctrl.h
parent36a21d51725af2ce0700c6ebcb6b9594aac658a6 (diff)
x86/resctrl: Split struct rdt_resource
resctrl is the defacto Linux ABI for SoC resource partitioning features. To support it on another architecture, it needs to be abstracted from the features provided by Intel RDT and AMD PQoS, and moved to /fs/. struct rdt_resource contains a mix of architecture private details and properties of the filesystem interface user-space uses. Start by splitting struct rdt_resource, into an architecture private 'hw' struct, which contains the common resctrl structure that would be used by any architecture. The foreach helpers are most commonly used by the filesystem code, and should return the common resctrl structure. for_each_rdt_resource() is changed to walk the common structure in its parent arch private structure. Move as much of the structure as possible into the common structure in the core code's header file. The x86 hardware accessors remain part of the architecture private code, as do num_closid, mon_scale and mbm_width. mon_scale and mbm_width are used to detect overflow of the hardware counters, and convert them from their native size to bytes. Any cross-architecture abstraction should be in terms of bytes, making these properties private. The hardware's num_closid is kept in the private structure to force the filesystem code to use a helper to access it. MPAM would return a single value for the system, regardless of the resource. Using the helper prevents this field from being confused with the version of num_closid that is being exposed to user-space (added in a later patch). After this split, filesystem code touching a 'hw' struct indicates where an abstraction is needed. Splitting this structure only moves types around, and should not lead to any change in behaviour. 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/20210728170637.25610-2-james.morse@arm.com
Diffstat (limited to 'include/linux/resctrl.h')
-rw-r--r--include/linux/resctrl.h110
1 files changed, 110 insertions, 0 deletions
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 9b05af9b3e28..5ccf36b7dbbf 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -2,6 +2,8 @@
#ifndef _RESCTRL_H
#define _RESCTRL_H
+#include <linux/kernel.h>
+#include <linux/list.h>
#include <linux/pid.h>
#ifdef CONFIG_PROC_CPU_RESCTRL
@@ -13,4 +15,112 @@ int proc_resctrl_show(struct seq_file *m,
#endif
+struct rdt_domain;
+
+/**
+ * struct resctrl_cache - Cache allocation related data
+ * @cbm_len: Length of the cache bit mask
+ * @min_cbm_bits: Minimum number of consecutive bits to be set
+ * @cbm_idx_mult: Multiplier of CBM index
+ * @cbm_idx_offset: Offset of CBM index. CBM index is computed by:
+ * closid * cbm_idx_multi + cbm_idx_offset
+ * in a cache bit mask
+ * @shareable_bits: Bitmask of shareable resource with other
+ * executing entities
+ * @arch_has_sparse_bitmaps: True if a bitmap like f00f is valid.
+ * @arch_has_empty_bitmaps: True if the '0' bitmap is valid.
+ * @arch_has_per_cpu_cfg: True if QOS_CFG register for this cache
+ * level has CPU scope.
+ */
+struct resctrl_cache {
+ unsigned int cbm_len;
+ unsigned int min_cbm_bits;
+ unsigned int cbm_idx_mult; // TODO remove this
+ unsigned int cbm_idx_offset; // TODO remove this
+ unsigned int shareable_bits;
+ bool arch_has_sparse_bitmaps;
+ bool arch_has_empty_bitmaps;
+ bool arch_has_per_cpu_cfg;
+};
+
+/**
+ * enum membw_throttle_mode - System's memory bandwidth throttling mode
+ * @THREAD_THROTTLE_UNDEFINED: Not relevant to the system
+ * @THREAD_THROTTLE_MAX: Memory bandwidth is throttled at the core
+ * always using smallest bandwidth percentage
+ * assigned to threads, aka "max throttling"
+ * @THREAD_THROTTLE_PER_THREAD: Memory bandwidth is throttled at the thread
+ */
+enum membw_throttle_mode {
+ THREAD_THROTTLE_UNDEFINED = 0,
+ THREAD_THROTTLE_MAX,
+ THREAD_THROTTLE_PER_THREAD,
+};
+
+/**
+ * struct resctrl_membw - Memory bandwidth allocation related data
+ * @min_bw: Minimum memory bandwidth percentage user can request
+ * @bw_gran: Granularity at which the memory bandwidth is allocated
+ * @delay_linear: True if memory B/W delay is in linear scale
+ * @arch_needs_linear: True if we can't configure non-linear resources
+ * @throttle_mode: Bandwidth throttling mode when threads request
+ * different memory bandwidths
+ * @mba_sc: True if MBA software controller(mba_sc) is enabled
+ * @mb_map: Mapping of memory B/W percentage to memory B/W delay
+ */
+struct resctrl_membw {
+ u32 min_bw;
+ u32 bw_gran;
+ u32 delay_linear;
+ bool arch_needs_linear;
+ enum membw_throttle_mode throttle_mode;
+ bool mba_sc;
+ u32 *mb_map;
+};
+
+struct rdt_parse_data;
+
+/**
+ * struct rdt_resource - attributes of a resctrl resource
+ * @rid: The index of the resource
+ * @alloc_enabled: Is allocation enabled on this machine
+ * @mon_enabled: Is monitoring enabled for this feature
+ * @alloc_capable: Is allocation available on this machine
+ * @mon_capable: Is monitor feature available on this machine
+ * @num_rmid: Number of RMIDs available
+ * @cache_level: Which cache level defines scope of this resource
+ * @cache: Cache allocation related data
+ * @membw: If the component has bandwidth controls, their properties.
+ * @domains: All domains for this resource
+ * @name: Name to use in "schemata" file.
+ * @data_width: Character width of data when displaying
+ * @default_ctrl: Specifies default cache cbm or memory B/W percent.
+ * @format_str: Per resource format string to show domain value
+ * @parse_ctrlval: Per resource function pointer to parse control values
+ * @evt_list: List of monitoring events
+ * @fflags: flags to choose base and info files
+ */
+struct rdt_resource {
+ int rid;
+ bool alloc_enabled;
+ bool mon_enabled;
+ bool alloc_capable;
+ bool mon_capable;
+ int num_rmid;
+ int cache_level;
+ struct resctrl_cache cache;
+ struct resctrl_membw membw;
+ struct list_head domains;
+ char *name;
+ int data_width;
+ u32 default_ctrl;
+ const char *format_str;
+ int (*parse_ctrlval)(struct rdt_parse_data *data,
+ struct rdt_resource *r,
+ struct rdt_domain *d);
+ struct list_head evt_list;
+ unsigned long fflags;
+
+};
+
#endif /* _RESCTRL_H */