[RFC PATCH v2 2/2] x86/resctrl: Split struct rdt_domain

From: James Morse
Date: Fri Feb 14 2020 - 13:30:05 EST

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Previous message: James Morse: "[RFC PATCH v2 1/2] x86/resctrl: Split struct rdt_resource"
In reply to: James Morse: "[RFC PATCH v2 1/2] x86/resctrl: Split struct rdt_resource"
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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/.

Split struct rdt_domain up too. Move everything that that is particular
to resctrl into a new header file. resctrl code paths touching a 'hw'
struct indicates where an abstraction is needed.

No change in behaviour, this patch just moves types around.

Signed-off-by: James Morse <james.morse@xxxxxxx>
---
arch/x86/kernel/cpu/resctrl/core.c | 32 +++++++++++-------
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 10 ++++--
arch/x86/kernel/cpu/resctrl/internal.h | 40 +++++------------------
arch/x86/kernel/cpu/resctrl/monitor.c | 8 +++--
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 29 ++++++++++------
include/linux/resctrl.h | 35 +++++++++++++++++++-
6 files changed, 94 insertions(+), 60 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index ce02f3f35b44..e48d54dfd657 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -367,10 +367,11 @@ static void
mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
{
unsigned int i;
+ struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);

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

/*
@@ -392,21 +393,23 @@ mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
struct rdt_resource *r)
{
unsigned int i;
+ struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);

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

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

struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
@@ -491,21 +494,22 @@ 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_arch_res(r);
+ struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
struct msr_param m;
u32 *dc, *dm;

- dc = kmalloc_array(r->num_closid, sizeof(*d->ctrl_val), GFP_KERNEL);
+ dc = kmalloc_array(r->num_closid, sizeof(*hw_dom->ctrl_val), GFP_KERNEL);
if (!dc)
return -ENOMEM;

- dm = kmalloc_array(r->num_closid, sizeof(*d->mbps_val), GFP_KERNEL);
+ dm = kmalloc_array(r->num_closid, sizeof(*hw_dom->mbps_val), GFP_KERNEL);
if (!dm) {
kfree(dc);
return -ENOMEM;
}

- d->ctrl_val = dc;
- d->mbps_val = dm;
+ hw_dom->ctrl_val = dc;
+ hw_dom->mbps_val = dm;
setup_default_ctrlval(r, dc, dm);

m.low = 0;
@@ -567,6 +571,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
{
int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
struct list_head *add_pos = NULL;
+ struct rdt_hw_domain *hw_dom;
struct rdt_domain *d;

d = rdt_find_domain(r, id, &add_pos);
@@ -580,10 +585,11 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
return;
}

- d = kzalloc_node(sizeof(*d), GFP_KERNEL, cpu_to_node(cpu));
- if (!d)
+ hw_dom = kzalloc_node(sizeof(*hw_dom), GFP_KERNEL, cpu_to_node(cpu));
+ if (!hw_dom)
return;

+ d = &hw_dom->resctrl;
d->id = id;
cpumask_set_cpu(cpu, &d->cpu_mask);

@@ -610,6 +616,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
static void domain_remove_cpu(int cpu, struct rdt_resource *r)
{
int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
+ struct rdt_hw_domain *hw_dom;
struct rdt_domain *d;

d = rdt_find_domain(r, id, NULL);
@@ -617,6 +624,7 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
pr_warn("Could't find cache id for cpu %d\n", cpu);
return;
}
+ hw_dom = resctrl_to_arch_dom(d);

cpumask_clear_cpu(cpu, &d->cpu_mask);
if (cpumask_empty(&d->cpu_mask)) {
@@ -649,12 +657,12 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
if (d->plr)
d->plr->d = NULL;

- kfree(d->ctrl_val);
- kfree(d->mbps_val);
+ kfree(hw_dom->ctrl_val);
+ kfree(hw_dom->mbps_val);
bitmap_free(d->rmid_busy_llc);
kfree(d->mbm_total);
kfree(d->mbm_local);
- kfree(d);
+ kfree(hw_dom);
return;
}

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index c90aa79d90b9..cd79fc3715d3 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -237,6 +237,7 @@ static int parse_line(char *line, struct rdt_resource *r,

int update_domains(struct rdt_resource *r, int closid)
{
+ struct rdt_hw_domain *hw_dom;
struct msr_param msr_param;
cpumask_var_t cpu_mask;
struct rdt_domain *d;
@@ -253,7 +254,8 @@ int update_domains(struct rdt_resource *r, int closid)

mba_sc = is_mba_sc(r);
list_for_each_entry(d, &r->domains, list) {
- dc = !mba_sc ? d->ctrl_val : d->mbps_val;
+ hw_dom = resctrl_to_arch_dom(d);
+ dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
if (d->have_new_ctrl && d->new_ctrl != dc[closid]) {
cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
dc[closid] = d->new_ctrl;
@@ -372,17 +374,19 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,

static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
{
+ struct rdt_hw_domain *hw_dom;
struct rdt_domain *dom;
bool sep = false;
u32 ctrl_val;

seq_printf(s, "%*s:", max_name_width, r->name);
list_for_each_entry(dom, &r->domains, list) {
+ hw_dom = resctrl_to_arch_dom(dom);
if (sep)
seq_puts(s, ";");

- ctrl_val = (!is_mba_sc(r) ? dom->ctrl_val[closid] :
- dom->mbps_val[closid]);
+ ctrl_val = (!is_mba_sc(r) ? hw_dom->ctrl_val[closid] :
+ hw_dom->mbps_val[closid]);
seq_printf(s, r->format_str, dom->id, max_data_width,
ctrl_val);
sep = true;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 5e69f709b729..bc4089a1e775 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -291,44 +291,22 @@ struct mbm_state {
};

/**
- * struct rdt_domain - group of cpus sharing an RDT resource
- * @list: all instances of this resource
- * @id: unique id for this instance
- * @cpu_mask: which cpus share this resource
- * @rmid_busy_llc:
- * bitmap of which limbo RMIDs are above threshold
- * @mbm_total: saved state for MBM total bandwidth
- * @mbm_local: saved state for MBM local bandwidth
- * @mbm_over: worker to periodically read MBM h/w counters
- * @cqm_limbo: worker to periodically read CQM h/w counters
- * @mbm_work_cpu:
- * worker cpu for MBM h/w counters
- * @cqm_work_cpu:
- * worker cpu for CQM h/w counters
+ * struct rdt_hw_domain - group of cpus sharing an RDT resource
+ * @resctrl: Properties exposed to the resctrl file system
* @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID)
* @mbps_val: When mba_sc is enabled, this holds the bandwidth in MBps
- * @new_ctrl: new ctrl value to be loaded
- * @have_new_ctrl: did user provide new_ctrl for this domain
- * @plr: pseudo-locked region (if any) associated with domain
*/
-struct rdt_domain {
- struct list_head list;
- int id;
- struct cpumask cpu_mask;
- unsigned long *rmid_busy_llc;
- struct mbm_state *mbm_total;
- struct mbm_state *mbm_local;
- struct delayed_work mbm_over;
- struct delayed_work cqm_limbo;
- int mbm_work_cpu;
- int cqm_work_cpu;
+struct rdt_hw_domain {
+ struct rdt_domain resctrl;
u32 *ctrl_val;
u32 *mbps_val;
- u32 new_ctrl;
- bool have_new_ctrl;
- struct pseudo_lock_region *plr;
};

+static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
+{
+ return container_of(r, struct rdt_hw_domain, resctrl);
+}
+
/**
* struct msr_param - set a range of MSRs from a domain
* @res: The resource to use
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index cd34a06cec68..7b3b78c560d8 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -354,6 +354,7 @@ 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;
+ struct rdt_hw_domain *hw_dom_mba;
u32 cur_bw, delta_bw, user_bw;
struct rdt_resource *r_mba;
struct rdt_domain *dom_mba;
@@ -374,11 +375,12 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
pr_warn_once("Failure to get domain for MBA update\n");
return;
}
+ hw_dom_mba = resctrl_to_arch_dom(dom_mba);

cur_bw = pmbm_data->prev_bw;
- user_bw = dom_mba->mbps_val[closid];
+ user_bw = hw_dom_mba->mbps_val[closid];
delta_bw = pmbm_data->delta_bw;
- cur_msr_val = dom_mba->ctrl_val[closid];
+ cur_msr_val = hw_dom_mba->ctrl_val[closid];

/*
* For Ctrl groups read data from child monitor groups.
@@ -415,7 +417,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)

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;
+ hw_dom_mba->ctrl_val[closid] = new_msr_val;

/*
* Delta values are updated dynamically package wise for each
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index f3106dfc4da6..50e1fd13f04a 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -911,7 +911,7 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
list_for_each_entry(dom, &r->domains, list) {
if (sep)
seq_putc(seq, ';');
- ctrl = dom->ctrl_val;
+ ctrl = resctrl_to_arch_dom(dom)->ctrl_val;
sw_shareable = 0;
exclusive = 0;
seq_printf(seq, "%d=", dom->id);
@@ -1175,7 +1175,7 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
}

/* Check for overlap with other resource groups */
- ctrl = d->ctrl_val;
+ ctrl = resctrl_to_arch_dom(d)->ctrl_val;
for (i = 0; i < closids_supported(); i++, ctrl++) {
ctrl_b = *ctrl;
mode = rdtgroup_mode_by_closid(i);
@@ -1244,6 +1244,7 @@ bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
*/
static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
{
+ struct rdt_hw_domain *hw_dom;
int closid = rdtgrp->closid;
struct rdt_resource *r;
bool has_cache = false;
@@ -1254,7 +1255,8 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
continue;
has_cache = true;
list_for_each_entry(d, &r->domains, list) {
- if (rdtgroup_cbm_overlaps(r, d, d->ctrl_val[closid],
+ hw_dom = resctrl_to_arch_dom(d);
+ if (rdtgroup_cbm_overlaps(r, d, hw_dom->ctrl_val[closid],
rdtgrp->closid, false)) {
rdt_last_cmd_puts("Schemata overlaps\n");
return false;
@@ -1386,6 +1388,7 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
static int rdtgroup_size_show(struct kernfs_open_file *of,
struct seq_file *s, void *v)
{
+ struct rdt_hw_domain *hw_dom;
struct rdtgroup *rdtgrp;
struct rdt_resource *r;
struct rdt_domain *d;
@@ -1420,14 +1423,15 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
sep = false;
seq_printf(s, "%*s:", max_name_width, r->name);
list_for_each_entry(d, &r->domains, list) {
+ hw_dom = resctrl_to_arch_dom(d);
if (sep)
seq_putc(s, ';');
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
size = 0;
} else {
ctrl = (!is_mba_sc(r) ?
- d->ctrl_val[rdtgrp->closid] :
- d->mbps_val[rdtgrp->closid]);
+ hw_dom->ctrl_val[rdtgrp->closid] :
+ hw_dom->mbps_val[rdtgrp->closid]);
if (r->rid == RDT_RESOURCE_MBA)
size = ctrl;
else
@@ -1880,6 +1884,7 @@ 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].resctrl;
+ struct rdt_hw_domain *hw_dom;
struct rdt_domain *d;

if (!is_mbm_enabled() || !is_mba_linear() ||
@@ -1887,8 +1892,10 @@ static int set_mba_sc(bool mba_sc)
return -EINVAL;

r->membw.mba_sc = mba_sc;
- list_for_each_entry(d, &r->domains, list)
- setup_default_ctrlval(r, d->ctrl_val, d->mbps_val);
+ list_for_each_entry(d, &r->domains, list) {
+ hw_dom = resctrl_to_arch_dom(d);
+ setup_default_ctrlval(r, hw_dom->ctrl_val, hw_dom->mbps_val);
+ }

return 0;
}
@@ -2207,6 +2214,7 @@ static int rdt_init_fs_context(struct fs_context *fc)

static int reset_all_ctrls(struct rdt_resource *r)
{
+ struct rdt_hw_domain *hw_dom;
struct msr_param msr_param;
cpumask_var_t cpu_mask;
struct rdt_domain *d;
@@ -2225,10 +2233,11 @@ static int reset_all_ctrls(struct rdt_resource *r)
* from each domain to update the MSRs below.
*/
list_for_each_entry(d, &r->domains, list) {
+ hw_dom = resctrl_to_arch_dom(d);
cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);

for (i = 0; i < r->num_closid; i++)
- d->ctrl_val[i] = r->default_ctrl;
+ hw_dom->ctrl_val[i] = r->default_ctrl;
}
cpu = get_cpu();
/* Update CBM on this cpu if it's in cpu_mask. */
@@ -2616,7 +2625,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
d->have_new_ctrl = false;
d->new_ctrl = r->cache.shareable_bits;
used_b = r->cache.shareable_bits;
- ctrl = d->ctrl_val;
+ ctrl = resctrl_to_arch_dom(d)->ctrl_val;
for (i = 0; i < closids_supported(); i++, ctrl++) {
if (closid_allocated(i) && i != closid) {
mode = rdtgroup_mode_by_closid(i);
@@ -2633,7 +2642,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
* with an exclusive group.
*/
if (d_cdp)
- peer_ctl = d_cdp->ctrl_val[i];
+ peer_ctl = resctrl_to_arch_dom(d_cdp)->ctrl_val[i];
else
peer_ctl = 0;
used_b |= *ctrl | peer_ctl;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index a8a499c6644b..dbb1a31814a8 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -15,7 +15,40 @@ int proc_resctrl_show(struct seq_file *m,

#endif

-struct rdt_domain;
+/**
+ * struct rdt_domain - group of cpus sharing an RDT resource
+ * @list: all instances of this resource
+ * @id: unique id for this instance
+ * @cpu_mask: which cpus share this resource
+ * @new_ctrl: new ctrl value to be loaded
+ * @have_new_ctrl: did user provide new_ctrl for this domain
+ * @rmid_busy_llc: bitmap of which limbo RMIDs are above threshold
+ * @mbm_total: saved state for MBM total bandwidth
+ * @mbm_local: saved state for MBM local bandwidth
+ * @mbm_over: worker to periodically read MBM h/w counters
+ * @cqm_limbo: worker to periodically read CQM h/w counters
+ * @mbm_work_cpu: worker cpu for MBM h/w counters
+ * @cqm_work_cpu: worker cpu for CQM h/w counters
+ * @plr: pseudo-locked region (if any) associated with domain
+ */
+struct rdt_domain {
+ struct list_head list;
+ int id;
+ struct cpumask cpu_mask;
+
+ u32 new_ctrl;
+ bool have_new_ctrl;
+
+ unsigned long *rmid_busy_llc;
+ struct mbm_state *mbm_total;
+ struct mbm_state *mbm_local;
+ struct delayed_work mbm_over;
+ struct delayed_work cqm_limbo;
+ int mbm_work_cpu;
+ int cqm_work_cpu;
+
+ struct pseudo_lock_region *plr;
+};

/**
* struct resctrl_cache - Cache allocation related data
--
2.24.1

Next message: Mark Salyzyn: "Re: [PATCH 0/3] random: add random.rng_seed to bootconfig entry"
Previous message: James Morse: "[RFC PATCH v2 1/2] x86/resctrl: Split struct rdt_resource"
In reply to: James Morse: "[RFC PATCH v2 1/2] x86/resctrl: Split struct rdt_resource"
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