[RFC PATCH 01/20] x86/intel_rdt: Split struct rdt_resource

From: James Morse
Date: Fri Aug 24 2018 - 06:46:02 EST

resctrl is the defacto Linux ABI for SoC resource partitioning features.
To support it on another architecture, we need to abstract it from
Intel RDT, and move it to /fs/.

Lets start by splitting struct rdt_resource, (the name is kept for now
to keep the noise down), and add some type-trickery to keep the foreach
helpers working.

Move everything that that is particular to resctrl into a new header
file, keeping the x86 msr specific stuff where it is. resctrl code
paths touching a 'hw' struct indicates where an abstraction is needed.

We split rdt_domain up in a similar way in the next patch.
No change in behaviour, this patch just moves types around.

Signed-off-by: James Morse <james.morse@xxxxxxx>
---
arch/x86/kernel/cpu/intel_rdt.c | 193 +++++++++++---------
arch/x86/kernel/cpu/intel_rdt.h | 112 +++---------
arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c | 6 +-
arch/x86/kernel/cpu/intel_rdt_monitor.c | 23 ++-
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 37 ++--
include/linux/resctrl.h | 103 +++++++++++
6 files changed, 275 insertions(+), 199 deletions(-)
create mode 100644 include/linux/resctrl.h

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index ec4754f81cbd..8cb2639b8a56 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -64,122 +64,137 @@ mba_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
static void
cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);

-#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].domains)
+#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].resctrl.domains)

-struct rdt_resource rdt_resources_all[] = {
+struct rdt_hw_resource rdt_resources_all[] = {
[RDT_RESOURCE_L3] =
{
.rid = RDT_RESOURCE_L3,
- .name = "L3",
- .domains = domain_init(RDT_RESOURCE_L3),
+ .resctrl = {
+ .name = "L3",
+ .cache_level = 3,
+ .cache = {
+ .min_cbm_bits = 1,
+ .cbm_idx_mult = 1,
+ .cbm_idx_offset = 0,
+ },
+ .domains = domain_init(RDT_RESOURCE_L3),
+ .parse_ctrlval = parse_cbm,
+ .format_str = "%d=%0*x",
+ .fflags = RFTYPE_RES_CACHE,
+ },
.msr_base = IA32_L3_CBM_BASE,
.msr_update = cat_wrmsr,
- .cache_level = 3,
- .cache = {
- .min_cbm_bits = 1,
- .cbm_idx_mult = 1,
- .cbm_idx_offset = 0,
- },
- .parse_ctrlval = parse_cbm,
- .format_str = "%d=%0*x",
- .fflags = RFTYPE_RES_CACHE,
},
[RDT_RESOURCE_L3DATA] =
{
.rid = RDT_RESOURCE_L3DATA,
- .name = "L3DATA",
- .domains = domain_init(RDT_RESOURCE_L3DATA),
+ .resctrl = {
+ .name = "L3DATA",
+ .cache_level = 3,
+ .cache = {
+ .min_cbm_bits = 1,
+ .cbm_idx_mult = 2,
+ .cbm_idx_offset = 0,
+ },
+ .domains = domain_init(RDT_RESOURCE_L3DATA),
+ .parse_ctrlval = parse_cbm,
+ .format_str = "%d=%0*x",
+ .fflags = RFTYPE_RES_CACHE,
+ },
.msr_base = IA32_L3_CBM_BASE,
.msr_update = cat_wrmsr,
- .cache_level = 3,
- .cache = {
- .min_cbm_bits = 1,
- .cbm_idx_mult = 2,
- .cbm_idx_offset = 0,
- },
- .parse_ctrlval = parse_cbm,
- .format_str = "%d=%0*x",
- .fflags = RFTYPE_RES_CACHE,
+
},
[RDT_RESOURCE_L3CODE] =
{
.rid = RDT_RESOURCE_L3CODE,
- .name = "L3CODE",
- .domains = domain_init(RDT_RESOURCE_L3CODE),
+ .resctrl = {
+ .name = "L3CODE",
+ .cache_level = 3,
+ .cache = {
+ .min_cbm_bits = 1,
+ .cbm_idx_mult = 2,
+ .cbm_idx_offset = 1,
+ },
+ .domains = domain_init(RDT_RESOURCE_L3CODE),
+ .parse_ctrlval = parse_cbm,
+ .format_str = "%d=%0*x",
+ .fflags = RFTYPE_RES_CACHE,
+ },
.msr_base = IA32_L3_CBM_BASE,
.msr_update = cat_wrmsr,
- .cache_level = 3,
- .cache = {
- .min_cbm_bits = 1,
- .cbm_idx_mult = 2,
- .cbm_idx_offset = 1,
- },
- .parse_ctrlval = parse_cbm,
- .format_str = "%d=%0*x",
- .fflags = RFTYPE_RES_CACHE,
},
[RDT_RESOURCE_L2] =
{
.rid = RDT_RESOURCE_L2,
- .name = "L2",
- .domains = domain_init(RDT_RESOURCE_L2),
+ .resctrl = {
+ .name = "L2",
+ .cache_level = 2,
+ .cache = {
+ .min_cbm_bits = 1,
+ .cbm_idx_mult = 1,
+ .cbm_idx_offset = 0,
+ },
+ .domains = domain_init(RDT_RESOURCE_L2),
+ .parse_ctrlval = parse_cbm,
+ .format_str = "%d=%0*x",
+ .fflags = RFTYPE_RES_CACHE,
+ },
.msr_base = IA32_L2_CBM_BASE,
.msr_update = cat_wrmsr,
- .cache_level = 2,
- .cache = {
- .min_cbm_bits = 1,
- .cbm_idx_mult = 1,
- .cbm_idx_offset = 0,
- },
- .parse_ctrlval = parse_cbm,
- .format_str = "%d=%0*x",
- .fflags = RFTYPE_RES_CACHE,
},
[RDT_RESOURCE_L2DATA] =
{
.rid = RDT_RESOURCE_L2DATA,
- .name = "L2DATA",
- .domains = domain_init(RDT_RESOURCE_L2DATA),
+ .resctrl = {
+ .name = "L2DATA",
+ .cache_level = 2,
+ .cache = {
+ .min_cbm_bits = 1,
+ .cbm_idx_mult = 2,
+ .cbm_idx_offset = 0,
+ },
+ .domains = domain_init(RDT_RESOURCE_L2DATA),
+ .parse_ctrlval = parse_cbm,
+ .format_str = "%d=%0*x",
+ .fflags = RFTYPE_RES_CACHE,
+ },
.msr_base = IA32_L2_CBM_BASE,
.msr_update = cat_wrmsr,
- .cache_level = 2,
- .cache = {
- .min_cbm_bits = 1,
- .cbm_idx_mult = 2,
- .cbm_idx_offset = 0,
- },
- .parse_ctrlval = parse_cbm,
- .format_str = "%d=%0*x",
- .fflags = RFTYPE_RES_CACHE,
},
[RDT_RESOURCE_L2CODE] =
{
.rid = RDT_RESOURCE_L2CODE,
- .name = "L2CODE",
- .domains = domain_init(RDT_RESOURCE_L2CODE),
+ .resctrl = {
+ .name = "L2CODE",
+ .cache_level = 2,
+ .cache = {
+ .min_cbm_bits = 1,
+ .cbm_idx_mult = 2,
+ .cbm_idx_offset = 1,
+ },
+ .domains = domain_init(RDT_RESOURCE_L2CODE),
+ .parse_ctrlval = parse_cbm,
+ .format_str = "%d=%0*x",
+ .fflags = RFTYPE_RES_CACHE,
+ },
.msr_base = IA32_L2_CBM_BASE,
.msr_update = cat_wrmsr,
- .cache_level = 2,
- .cache = {
- .min_cbm_bits = 1,
- .cbm_idx_mult = 2,
- .cbm_idx_offset = 1,
- },
- .parse_ctrlval = parse_cbm,
- .format_str = "%d=%0*x",
- .fflags = RFTYPE_RES_CACHE,
},
[RDT_RESOURCE_MBA] =
{
.rid = RDT_RESOURCE_MBA,
- .name = "MB",
- .domains = domain_init(RDT_RESOURCE_MBA),
+ .resctrl = {
+ .name = "MB",
+ .cache_level = 3,
+ .domains = domain_init(RDT_RESOURCE_MBA),
+ .parse_ctrlval = parse_bw,
+ .format_str = "%d=%*u",
+ .fflags = RFTYPE_RES_MB,
+ },
.msr_base = IA32_MBA_THRTL_BASE,
.msr_update = mba_wrmsr,
- .cache_level = 3,
- .parse_ctrlval = parse_bw,
- .format_str = "%d=%*u",
- .fflags = RFTYPE_RES_MB,
},
};

@@ -208,7 +223,7 @@ static unsigned int cbm_idx(struct rdt_resource *r, unsigned int closid)
*/
static inline void cache_alloc_hsw_probe(void)
{
- struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3];
+ struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].resctrl;
u32 l, h, max_cbm = BIT_MASK(20) - 1;

if (wrmsr_safe(IA32_L3_CBM_BASE, max_cbm, 0))
@@ -233,7 +248,7 @@ static inline void cache_alloc_hsw_probe(void)
bool is_mba_sc(struct rdt_resource *r)
{
if (!r)
- return rdt_resources_all[RDT_RESOURCE_MBA].membw.mba_sc;
+ return rdt_resources_all[RDT_RESOURCE_MBA].resctrl.membw.mba_sc;

return r->membw.mba_sc;
}
@@ -303,8 +318,8 @@ static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)

static void rdt_get_cdp_config(int level, int type)
{
- struct rdt_resource *r_l = &rdt_resources_all[level];
- struct rdt_resource *r = &rdt_resources_all[type];
+ struct rdt_resource *r_l = &rdt_resources_all[level].resctrl;
+ struct rdt_resource *r = &rdt_resources_all[type].resctrl;

r->num_closid = r_l->num_closid / 2;
r->cache.cbm_len = r_l->cache.cbm_len;
@@ -362,19 +377,21 @@ static void
mba_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
{
unsigned int i;
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);

/* Write the delay values for mba. */
for (i = m->low; i < m->high; i++)
- wrmsrl(r->msr_base + i, delay_bw_map(d->ctrl_val[i], r));
+ wrmsrl(hw_res->msr_base + i, delay_bw_map(d->ctrl_val[i], r));
}

static void
cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
{
unsigned int i;
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);

for (i = m->low; i < m->high; i++)
- wrmsrl(r->msr_base + cbm_idx(r, i), d->ctrl_val[i]);
+ wrmsrl(hw_res->msr_base + cbm_idx(r, i), d->ctrl_val[i]);
}

struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
@@ -394,12 +411,13 @@ void rdt_ctrl_update(void *arg)
{
struct msr_param *m = arg;
struct rdt_resource *r = m->res;
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);
int cpu = smp_processor_id();
struct rdt_domain *d;

d = get_domain_from_cpu(cpu, r);
if (d) {
- r->msr_update(d, m, r);
+ hw_res->msr_update(d, m, r);
return;
}
pr_warn_once("cpu %d not found in any domain for resource %s\n",
@@ -457,6 +475,7 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)

static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
{
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);
struct msr_param m;
u32 *dc, *dm;

@@ -476,7 +495,7 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)

m.low = 0;
m.high = r->num_closid;
- r->msr_update(d, &m, r);
+ hw_res->msr_update(d, &m, r);
return 0;
}

@@ -619,7 +638,7 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
return;
}

- if (r == &rdt_resources_all[RDT_RESOURCE_L3]) {
+ if (r == &rdt_resources_all[RDT_RESOURCE_L3].resctrl) {
if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
cancel_delayed_work(&d->mbm_over);
mbm_setup_overflow_handler(d, 0);
@@ -800,21 +819,21 @@ static __init bool get_rdt_alloc_resources(void)
return false;

if (rdt_cpu_has(X86_FEATURE_CAT_L3)) {
- rdt_get_cache_alloc_cfg(1, &rdt_resources_all[RDT_RESOURCE_L3]);
+ rdt_get_cache_alloc_cfg(1, &rdt_resources_all[RDT_RESOURCE_L3].resctrl);
if (rdt_cpu_has(X86_FEATURE_CDP_L3))
rdt_get_cdp_l3_config();
ret = true;
}
if (rdt_cpu_has(X86_FEATURE_CAT_L2)) {
/* CPUID 0x10.2 fields are same format at 0x10.1 */
- rdt_get_cache_alloc_cfg(2, &rdt_resources_all[RDT_RESOURCE_L2]);
+ rdt_get_cache_alloc_cfg(2, &rdt_resources_all[RDT_RESOURCE_L2].resctrl);
if (rdt_cpu_has(X86_FEATURE_CDP_L2))
rdt_get_cdp_l2_config();
ret = true;
}

if (rdt_cpu_has(X86_FEATURE_MBA)) {
- if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
+ if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA].resctrl))
ret = true;
}
return ret;
@@ -832,7 +851,7 @@ static __init bool get_rdt_mon_resources(void)
if (!rdt_mon_features)
return false;

- return !rdt_get_mon_l3_config(&rdt_resources_all[RDT_RESOURCE_L3]);
+ return !rdt_get_mon_l3_config(&rdt_resources_all[RDT_RESOURCE_L3].resctrl);
}

static __init void rdt_quirks(void)
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index 39752825e376..20a6674ac67c 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -2,6 +2,7 @@
#ifndef _ASM_X86_INTEL_RDT_H
#define _ASM_X86_INTEL_RDT_H

+#include <linux/resctrl.h>
#include <linux/sched.h>
#include <linux/kernfs.h>
#include <linux/jump_label.h>
@@ -246,44 +247,6 @@ struct msr_param {
int high;
};

-/**
- * struct rdt_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
- */
-struct rdt_cache {
- unsigned int cbm_len;
- unsigned int min_cbm_bits;
- unsigned int cbm_idx_mult;
- unsigned int cbm_idx_offset;
- unsigned int shareable_bits;
-};
-
-/**
- * struct rdt_membw - Memory bandwidth allocation related data
- * @max_delay: Max throttle delay. Delay is the hardware
- * representation for memory bandwidth.
- * @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
- * @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 rdt_membw {
- u32 max_delay;
- u32 min_bw;
- u32 bw_gran;
- u32 delay_linear;
- bool mba_sc;
- u32 *mb_map;
-};
-
static inline bool is_llc_occupancy_enabled(void)
{
return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
@@ -312,59 +275,33 @@ static inline bool is_mbm_event(int e)

/**
* struct rdt_resource - attributes of an RDT resource
+ * @resctrl: Properties exposed to the resctrl filesystem
* @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
- * @name: Name to use in "schemata" file
- * @num_closid: Number of CLOSIDs available
- * @cache_level: Which cache level defines scope of this resource
- * @default_ctrl: Specifies default cache cbm or memory B/W percent.
* @msr_base: Base MSR address for CBMs
* @msr_update: Function pointer to update QOS MSRs
- * @data_width: Character width of data when displaying
- * @domains: All domains for this resource
- * @cache: Cache allocation related data
- * @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
- * @num_rmid: Number of RMIDs available
* @mon_scale: cqm counter * mon_scale = occupancy in bytes
* @fflags: flags to choose base and info files
*/
-struct rdt_resource {
+struct rdt_hw_resource {
+ struct rdt_resource resctrl;
int rid;
- bool alloc_enabled;
- bool mon_enabled;
- bool alloc_capable;
- bool mon_capable;
- char *name;
- int num_closid;
- int cache_level;
- u32 default_ctrl;
unsigned int msr_base;
void (*msr_update) (struct rdt_domain *d, struct msr_param *m,
struct rdt_resource *r);
- int data_width;
- struct list_head domains;
- struct rdt_cache cache;
- struct rdt_membw membw;
- const char *format_str;
- int (*parse_ctrlval) (char *buf, struct rdt_resource *r,
- struct rdt_domain *d);
- struct list_head evt_list;
- int num_rmid;
unsigned int mon_scale;
- unsigned long fflags;
};

+static inline struct rdt_hw_resource *resctrl_to_rdt(struct rdt_resource *r)
+{
+ return container_of(r, struct rdt_hw_resource, resctrl);
+}
+
int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d);
int parse_bw(char *buf, struct rdt_resource *r, struct rdt_domain *d);

extern struct mutex rdtgroup_mutex;

-extern struct rdt_resource rdt_resources_all[];
+extern struct rdt_hw_resource rdt_resources_all[];
extern struct rdtgroup rdtgroup_default;
DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);

@@ -383,29 +320,38 @@ enum {
RDT_NUM_RESOURCES,
};

+static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
+{
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(res);
+
+ hw_res++;
+ return &hw_res->resctrl;
+}
+
+
#define for_each_capable_rdt_resource(r) \
- for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
- r++) \
+ for (r = &rdt_resources_all[0].resctrl; r < &rdt_resources_all[RDT_NUM_RESOURCES].resctrl;\
+ r = resctrl_inc(r)) \
if (r->alloc_capable || r->mon_capable)

#define for_each_alloc_capable_rdt_resource(r) \
- for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
- r++) \
+ for (r = &rdt_resources_all[0].resctrl; r < &rdt_resources_all[RDT_NUM_RESOURCES].resctrl;\
+ r = resctrl_inc(r)) \
if (r->alloc_capable)

#define for_each_mon_capable_rdt_resource(r) \
- for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
- r++) \
+ for (r = &rdt_resources_all[0].resctrl; r < &rdt_resources_all[RDT_NUM_RESOURCES].resctrl;\
+ r = resctrl_inc(r)) \
if (r->mon_capable)

#define for_each_alloc_enabled_rdt_resource(r) \
- for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
- r++) \
+ for (r = &rdt_resources_all[0].resctrl; r < &rdt_resources_all[RDT_NUM_RESOURCES].resctrl;\
+ r = resctrl_inc(r)) \
if (r->alloc_enabled)

#define for_each_mon_enabled_rdt_resource(r) \
- for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
- r++) \
+ for (r = &rdt_resources_all[0].resctrl; r < &rdt_resources_all[RDT_NUM_RESOURCES].resctrl;\
+ r = resctrl_inc(r)) \
if (r->mon_enabled)

/* CPUID.(EAX=10H, ECX=ResID=1).EAX */
diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
index 116d57b248d3..58890612ca8d 100644
--- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
@@ -348,6 +348,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
int rdtgroup_mondata_show(struct seq_file *m, void *arg)
{
struct kernfs_open_file *of = m->private;
+ struct rdt_hw_resource *hw_res;
u32 resid, evtid, domid;
struct rdtgroup *rdtgrp;
struct rdt_resource *r;
@@ -363,7 +364,8 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
domid = md.u.domid;
evtid = md.u.evtid;

- r = &rdt_resources_all[resid];
+ hw_res = &rdt_resources_all[resid];
+ r = &hw_res->resctrl;
d = rdt_find_domain(r, domid, NULL);
if (!d) {
ret = -ENOENT;
@@ -377,7 +379,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
else if (rr.val & RMID_VAL_UNAVAIL)
seq_puts(m, "Unavailable\n");
else
- seq_printf(m, "%llu\n", rr.val * r->mon_scale);
+ seq_printf(m, "%llu\n", rr.val * hw_res->mon_scale);

out:
rdtgroup_kn_unlock(of->kn);
diff --git a/arch/x86/kernel/cpu/intel_rdt_monitor.c b/arch/x86/kernel/cpu/intel_rdt_monitor.c
index b0f3aed76b75..493d264a0dbe 100644
--- a/arch/x86/kernel/cpu/intel_rdt_monitor.c
+++ b/arch/x86/kernel/cpu/intel_rdt_monitor.c
@@ -122,7 +122,7 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
struct rdt_resource *r;
u32 crmid = 1, nrmid;

- r = &rdt_resources_all[RDT_RESOURCE_L3];
+ r = &rdt_resources_all[RDT_RESOURCE_L3].resctrl;

/*
* Skip RMID 0 and start from RMID 1 and check all the RMIDs that
@@ -180,7 +180,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
int cpu;
u64 val;

- r = &rdt_resources_all[RDT_RESOURCE_L3];
+ r = &rdt_resources_all[RDT_RESOURCE_L3].resctrl;

entry->busy = 0;
cpu = get_cpu();
@@ -281,7 +281,7 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr)
*/
static void mbm_bw_count(u32 rmid, struct rmid_read *rr)
{
- struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3];
+ struct rdt_hw_resource *r = &rdt_resources_all[RDT_RESOURCE_L3];
struct mbm_state *m = &rr->d->mbm_local[rmid];
u64 tval, cur_bw, chunks;

@@ -365,13 +365,15 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
{
u32 closid, rmid, cur_msr, cur_msr_val, new_msr_val;
struct mbm_state *pmbm_data, *cmbm_data;
+ struct rdt_hw_resource *hw_r_mba;
u32 cur_bw, delta_bw, user_bw;
struct rdt_resource *r_mba;
struct rdt_domain *dom_mba;
struct list_head *head;
struct rdtgroup *entry;

- r_mba = &rdt_resources_all[RDT_RESOURCE_MBA];
+ hw_r_mba = &rdt_resources_all[RDT_RESOURCE_MBA];
+ r_mba = &hw_r_mba->resctrl;
closid = rgrp->closid;
rmid = rgrp->mon.rmid;
pmbm_data = &dom_mbm->mbm_local[rmid];
@@ -420,7 +422,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
return;
}

- cur_msr = r_mba->msr_base + closid;
+ cur_msr = hw_r_mba->msr_base + closid;
wrmsrl(cur_msr, delay_bw_map(new_msr_val, r_mba));
dom_mba->ctrl_val[closid] = new_msr_val;

@@ -484,7 +486,7 @@ void cqm_handle_limbo(struct work_struct *work)

mutex_lock(&rdtgroup_mutex);

- r = &rdt_resources_all[RDT_RESOURCE_L3];
+ r = &rdt_resources_all[RDT_RESOURCE_L3].resctrl;
d = get_domain_from_cpu(cpu, r);

if (!d) {
@@ -507,7 +509,7 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms)
struct rdt_resource *r;
int cpu;

- r = &rdt_resources_all[RDT_RESOURCE_L3];
+ r = &rdt_resources_all[RDT_RESOURCE_L3].resctrl;

cpu = cpumask_any(&dom->cpu_mask);
dom->cqm_work_cpu = cpu;
@@ -528,7 +530,7 @@ void mbm_handle_overflow(struct work_struct *work)
if (!static_branch_likely(&rdt_enable_key))
goto out_unlock;

- d = get_domain_from_cpu(cpu, &rdt_resources_all[RDT_RESOURCE_L3]);
+ d = get_domain_from_cpu(cpu, &rdt_resources_all[RDT_RESOURCE_L3].resctrl);
if (!d)
goto out_unlock;

@@ -626,8 +628,9 @@ static void l3_mon_evt_init(struct rdt_resource *r)
int rdt_get_mon_l3_config(struct rdt_resource *r)
{
int ret;
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);

- r->mon_scale = boot_cpu_data.x86_cache_occ_scale;
+ hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale;
r->num_rmid = boot_cpu_data.x86_cache_max_rmid + 1;

/*
@@ -640,7 +643,7 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
intel_cqm_threshold = boot_cpu_data.x86_cache_size * 1024 / r->num_rmid;

/* h/w works in units of "boot_cpu_data.x86_cache_occ_scale" */
- intel_cqm_threshold /= r->mon_scale;
+ intel_cqm_threshold /= hw_res->mon_scale;

ret = dom_data_init(r);
if (ret)
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 749856a2e736..3afe642e3ede 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -715,8 +715,9 @@ static int max_threshold_occ_show(struct kernfs_open_file *of,
struct seq_file *seq, void *v)
{
struct rdt_resource *r = of->kn->parent->priv;
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);

- seq_printf(seq, "%u\n", intel_cqm_threshold * r->mon_scale);
+ seq_printf(seq, "%u\n", intel_cqm_threshold * hw_res->mon_scale);

return 0;
}
@@ -725,6 +726,7 @@ static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct rdt_resource *r = of->kn->parent->priv;
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);
unsigned int bytes;
int ret;

@@ -735,7 +737,7 @@ static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
if (bytes > (boot_cpu_data.x86_cache_size * 1024))
return -EINVAL;

- intel_cqm_threshold = bytes / r->mon_scale;
+ intel_cqm_threshold = bytes / hw_res->mon_scale;

return nbytes;
}
@@ -1007,7 +1009,7 @@ static void l2_qos_cfg_update(void *arg)

static inline bool is_mba_linear(void)
{
- return rdt_resources_all[RDT_RESOURCE_MBA].membw.delay_linear;
+ return rdt_resources_all[RDT_RESOURCE_MBA].resctrl.membw.delay_linear;
}

static int set_cache_qos_cfg(int level, bool enable)
@@ -1028,7 +1030,7 @@ static int set_cache_qos_cfg(int level, bool enable)
else
return -EINVAL;

- r_l = &rdt_resources_all[level];
+ r_l = &rdt_resources_all[level].resctrl;
list_for_each_entry(d, &r_l->domains, list) {
/* Pick one CPU from each domain instance to update MSR */
cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
@@ -1054,7 +1056,7 @@ static int set_cache_qos_cfg(int level, bool enable)
*/
static int set_mba_sc(bool mba_sc)
{
- struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA];
+ struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].resctrl;
struct rdt_domain *d;

if (!is_mbm_enabled() || !is_mba_linear() ||
@@ -1070,9 +1072,9 @@ static int set_mba_sc(bool mba_sc)

static int cdp_enable(int level, int data_type, int code_type)
{
- struct rdt_resource *r_ldata = &rdt_resources_all[data_type];
- struct rdt_resource *r_lcode = &rdt_resources_all[code_type];
- struct rdt_resource *r_l = &rdt_resources_all[level];
+ struct rdt_resource *r_ldata = &rdt_resources_all[data_type].resctrl;
+ struct rdt_resource *r_lcode = &rdt_resources_all[code_type].resctrl;
+ struct rdt_resource *r_l = &rdt_resources_all[level].resctrl;
int ret;

if (!r_l->alloc_capable || !r_ldata->alloc_capable ||
@@ -1102,13 +1104,13 @@ static int cdpl2_enable(void)

static void cdp_disable(int level, int data_type, int code_type)
{
- struct rdt_resource *r = &rdt_resources_all[level];
+ struct rdt_resource *r = &rdt_resources_all[level].resctrl;

r->alloc_enabled = r->alloc_capable;

- if (rdt_resources_all[data_type].alloc_enabled) {
- rdt_resources_all[data_type].alloc_enabled = false;
- rdt_resources_all[code_type].alloc_enabled = false;
+ if (rdt_resources_all[data_type].resctrl.alloc_enabled) {
+ rdt_resources_all[data_type].resctrl.alloc_enabled = false;
+ rdt_resources_all[code_type].resctrl.alloc_enabled = false;
set_cache_qos_cfg(level, false);
}
}
@@ -1125,9 +1127,9 @@ static void cdpl2_disable(void)

static void cdp_disable_all(void)
{
- if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled)
+ if (rdt_resources_all[RDT_RESOURCE_L3DATA].resctrl.alloc_enabled)
cdpl3_disable();
- if (rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled)
+ if (rdt_resources_all[RDT_RESOURCE_L2DATA].resctrl.alloc_enabled)
cdpl2_disable();
}

@@ -1303,7 +1305,7 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
static_branch_enable_cpuslocked(&rdt_enable_key);

if (is_mbm_enabled()) {
- r = &rdt_resources_all[RDT_RESOURCE_L3];
+ r = &rdt_resources_all[RDT_RESOURCE_L3].resctrl;
list_for_each_entry(dom, &r->domains, list)
mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL);
}
@@ -1542,6 +1544,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
struct rdt_domain *d,
struct rdt_resource *r, struct rdtgroup *prgrp)
{
+ struct rdt_hw_resource *hw_res = resctrl_to_rdt(r);
union mon_data_bits priv;
struct kernfs_node *kn;
struct mon_evt *mevt;
@@ -1569,7 +1572,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
goto out_destroy;
}

- priv.u.rid = r->rid;
+ priv.u.rid = hw_res->rid;
priv.u.domid = d->id;
list_for_each_entry(mevt, &r->evt_list, list) {
priv.u.evtid = mevt->evtid;
@@ -2030,7 +2033,7 @@ static int rdtgroup_rmdir(struct kernfs_node *kn)

static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
{
- if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled)
+ if (rdt_resources_all[RDT_RESOURCE_L3DATA].resctrl.alloc_enabled)
seq_puts(seq, ",cdp");
return 0;
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
new file mode 100644
index 000000000000..8d32b2c6d72b
--- /dev/null
+++ b/include/linux/resctrl.h
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+// Based on arch/x86/kernel/cpu/intel_rdt.h
+
+#ifndef __LINUX_RESCTRL_H
+#define __LINUX_RESCTRL_H
+
+#include <linux/list.h>
+#include <linux/kernel.h>
+
+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
+ */
+struct resctrl_cache {
+ u32 cbm_len;
+ u32 min_cbm_bits;
+ unsigned int cbm_idx_mult; // TODO remove this
+ unsigned int cbm_idx_offset; // TODO remove this
+ u32 shareable_bits;
+};
+
+/**
+ * struct resctrl_membw - Memory bandwidth allocation related data
+ * @max_delay: Max throttle delay. Delay is the hardware
+ * representation for memory bandwidth.
+ * @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
+ * @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 max_delay;
+ u32 min_bw;
+ u32 bw_gran;
+ u32 delay_linear;
+ bool mba_sc;
+ u32 *mb_map;
+};
+
+/**
+ * @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
+ *
+ * @cache_level: Which cache level defines scope of this resource.
+ *
+ * @cache: If the component has cache controls, their properties.
+ * @membw: If the component has bandwidth controls, their properties.
+ *
+ * @num_closid: Number of CLOSIDs available.
+ * @num_rmid: Number of RMIDs available.
+ *
+ * @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 {
+ bool alloc_enabled;
+ bool mon_enabled;
+ bool alloc_capable;
+ bool mon_capable;
+
+ int cache_level;
+
+ struct resctrl_cache cache;
+ struct resctrl_membw membw;
+
+ int num_closid;
+ int num_rmid;
+
+ struct list_head domains;
+
+ char *name;
+ int data_width;
+ u32 default_ctrl;
+ const char *format_str;
+ int (*parse_ctrlval) (char *buf, struct rdt_resource *r,
+ struct rdt_domain *d);
+
+ struct list_head evt_list;
+ unsigned long fflags;
+
+};
+
+#endif /* __LINUX_RESCTRL_H */
--
2.18.0