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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-01 12:24:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-01 12:24:14 -0700
commit9bf9511e3d9f328c03f6f79bfb741c3d18f2f2c0 (patch)
tree564b3b0a94c3231b5fdc1fab7fe61e7131fb42e7 /arch/x86/kernel/cpu
parentef34ba6d36af9e6f5918f7f7e287be4b70a358b4 (diff)
parent0c4d5ba1b998e713815b7790d3db6ced0ae49489 (diff)
Merge tag 'x86_cache_updates_for_5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cache resource control updates from Borislav Petkov: "Add support for wider Memory Bandwidth Monitoring counters by querying their width from CPUID. As a prerequsite for that, streamline and unify the CPUID detection of the respective resource control attributes. By Reinette Chatre" * tag 'x86_cache_updates_for_5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/resctrl: Support wider MBM counters x86/resctrl: Support CPUID enumeration of MBM counter width x86/resctrl: Maintain MBM counter width per resource x86/resctrl: Query LLC monitoring properties once during boot x86/resctrl: Remove unnecessary RMID checks x86/cpu: Move resctrl CPUID code to resctrl/ x86/resctrl: Rename asm/resctrl_sched.h to asm/resctrl.h
Diffstat (limited to 'arch/x86/kernel/cpu')
-rw-r--r--arch/x86/kernel/cpu/amd.c3
-rw-r--r--arch/x86/kernel/cpu/common.c40
-rw-r--r--arch/x86/kernel/cpu/intel.c7
-rw-r--r--arch/x86/kernel/cpu/resctrl/core.c32
-rw-r--r--arch/x86/kernel/cpu/resctrl/ctrlmondata.c8
-rw-r--r--arch/x86/kernel/cpu/resctrl/internal.h15
-rw-r--r--arch/x86/kernel/cpu/resctrl/monitor.c27
-rw-r--r--arch/x86/kernel/cpu/resctrl/pseudo_lock.c2
-rw-r--r--arch/x86/kernel/cpu/resctrl/rdtgroup.c4
9 files changed, 80 insertions, 58 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 547ad7bbf0e0..c36e89930965 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -18,6 +18,7 @@
#include <asm/pci-direct.h>
#include <asm/delay.h>
#include <asm/debugreg.h>
+#include <asm/resctrl.h>
#ifdef CONFIG_X86_64
# include <asm/mmconfig.h>
@@ -597,6 +598,8 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
x86_amd_ls_cfg_ssbd_mask = 1ULL << bit;
}
}
+
+ resctrl_cpu_detect(c);
}
static void early_detect_mem_encrypt(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index bed0cb83fe24..d07809286b95 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -854,30 +854,6 @@ static void init_speculation_control(struct cpuinfo_x86 *c)
}
}
-static void init_cqm(struct cpuinfo_x86 *c)
-{
- if (!cpu_has(c, X86_FEATURE_CQM_LLC)) {
- c->x86_cache_max_rmid = -1;
- c->x86_cache_occ_scale = -1;
- return;
- }
-
- /* will be overridden if occupancy monitoring exists */
- c->x86_cache_max_rmid = cpuid_ebx(0xf);
-
- if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC) ||
- cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL) ||
- cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)) {
- u32 eax, ebx, ecx, edx;
-
- /* QoS sub-leaf, EAX=0Fh, ECX=1 */
- cpuid_count(0xf, 1, &eax, &ebx, &ecx, &edx);
-
- c->x86_cache_max_rmid = ecx;
- c->x86_cache_occ_scale = ebx;
- }
-}
-
void get_cpu_cap(struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
@@ -945,7 +921,6 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
init_scattered_cpuid_features(c);
init_speculation_control(c);
- init_cqm(c);
/*
* Clear/Set all flags overridden by options, after probe.
@@ -1377,20 +1352,6 @@ static void generic_identify(struct cpuinfo_x86 *c)
#endif
}
-static void x86_init_cache_qos(struct cpuinfo_x86 *c)
-{
- /*
- * The heavy lifting of max_rmid and cache_occ_scale are handled
- * in get_cpu_cap(). Here we just set the max_rmid for the boot_cpu
- * in case CQM bits really aren't there in this CPU.
- */
- if (c != &boot_cpu_data) {
- boot_cpu_data.x86_cache_max_rmid =
- min(boot_cpu_data.x86_cache_max_rmid,
- c->x86_cache_max_rmid);
- }
-}
-
/*
* Validate that ACPI/mptables have the same information about the
* effective APIC id and update the package map.
@@ -1503,7 +1464,6 @@ static void identify_cpu(struct cpuinfo_x86 *c)
#endif
x86_init_rdrand(c);
- x86_init_cache_qos(c);
setup_pku(c);
/*
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index a19a680542ce..166d7c355896 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -22,6 +22,7 @@
#include <asm/cpu_device_id.h>
#include <asm/cmdline.h>
#include <asm/traps.h>
+#include <asm/resctrl.h>
#ifdef CONFIG_X86_64
#include <linux/topology.h>
@@ -322,6 +323,11 @@ static void early_init_intel(struct cpuinfo_x86 *c)
detect_ht_early(c);
}
+static void bsp_init_intel(struct cpuinfo_x86 *c)
+{
+ resctrl_cpu_detect(c);
+}
+
#ifdef CONFIG_X86_32
/*
* Early probe support logic for ppro memory erratum #50
@@ -961,6 +967,7 @@ static const struct cpu_dev intel_cpu_dev = {
#endif
.c_detect_tlb = intel_detect_tlb,
.c_early_init = early_init_intel,
+ .c_bsp_init = bsp_init_intel,
.c_init = init_intel,
.c_x86_vendor = X86_VENDOR_INTEL,
};
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index d8cc5223b7ce..12f967c6b603 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -22,7 +22,7 @@
#include <linux/cpuhotplug.h>
#include <asm/intel-family.h>
-#include <asm/resctrl_sched.h>
+#include <asm/resctrl.h>
#include "internal.h"
/* Mutex to protect rdtgroup access. */
@@ -958,6 +958,36 @@ static __init void rdt_init_res_defs(void)
static enum cpuhp_state rdt_online;
+/* Runs once on the BSP during boot. */
+void resctrl_cpu_detect(struct cpuinfo_x86 *c)
+{
+ if (!cpu_has(c, X86_FEATURE_CQM_LLC)) {
+ c->x86_cache_max_rmid = -1;
+ c->x86_cache_occ_scale = -1;
+ c->x86_cache_mbm_width_offset = -1;
+ return;
+ }
+
+ /* will be overridden if occupancy monitoring exists */
+ c->x86_cache_max_rmid = cpuid_ebx(0xf);
+
+ if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC) ||
+ cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL) ||
+ cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)) {
+ u32 eax, ebx, ecx, edx;
+
+ /* QoS sub-leaf, EAX=0Fh, ECX=1 */
+ cpuid_count(0xf, 1, &eax, &ebx, &ecx, &edx);
+
+ c->x86_cache_max_rmid = ecx;
+ c->x86_cache_occ_scale = ebx;
+ if (c->x86_vendor == X86_VENDOR_INTEL)
+ c->x86_cache_mbm_width_offset = eax & 0xff;
+ else
+ c->x86_cache_mbm_width_offset = -1;
+ }
+}
+
static int __init resctrl_late_init(void)
{
struct rdt_resource *r;
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 055c8613b531..934c8fb8a64a 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -495,14 +495,16 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
return ret;
}
-void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
- struct rdtgroup *rdtgrp, int evtid, int first)
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+ struct rdt_domain *d, struct rdtgroup *rdtgrp,
+ int evtid, int first)
{
/*
* setup the parameters to send to the IPI to read the data.
*/
rr->rgrp = rdtgrp;
rr->evtid = evtid;
+ rr->r = r;
rr->d = d;
rr->val = 0;
rr->first = first;
@@ -539,7 +541,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
goto out;
}
- mon_event_read(&rr, d, rdtgrp, evtid, false);
+ mon_event_read(&rr, r, d, rdtgrp, evtid, false);
if (rr.val & RMID_VAL_ERROR)
seq_puts(m, "Error\n");
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 3dd13f3a8b23..f20a47d120b1 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -31,7 +31,7 @@
#define CQM_LIMBOCHECK_INTERVAL 1000
-#define MBM_CNTR_WIDTH 24
+#define MBM_CNTR_WIDTH_BASE 24
#define MBM_OVERFLOW_INTERVAL 1000
#define MAX_MBA_BW 100u
#define MBA_IS_LINEAR 0x4
@@ -40,6 +40,12 @@
#define RMID_VAL_ERROR BIT_ULL(63)
#define RMID_VAL_UNAVAIL BIT_ULL(62)
+/*
+ * With the above fields in use 62 bits remain in MSR_IA32_QM_CTR for
+ * data to be returned. The counter width is discovered from the hardware
+ * as an offset from MBM_CNTR_WIDTH_BASE.
+ */
+#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
struct rdt_fs_context {
@@ -87,6 +93,7 @@ union mon_data_bits {
struct rmid_read {
struct rdtgroup *rgrp;
+ struct rdt_resource *r;
struct rdt_domain *d;
int evtid;
bool first;
@@ -460,6 +467,7 @@ struct rdt_resource {
struct list_head evt_list;
int num_rmid;
unsigned int mon_scale;
+ unsigned int mbm_width;
unsigned long fflags;
};
@@ -587,8 +595,9 @@ void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
unsigned int dom_id);
void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
struct rdt_domain *d);
-void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
- struct rdtgroup *rdtgrp, int evtid, int first);
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+ struct rdt_domain *d, struct rdtgroup *rdtgrp,
+ int evtid, int first);
void mbm_setup_overflow_handler(struct rdt_domain *dom,
unsigned long delay_ms);
void mbm_handle_overflow(struct work_struct *work);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 773124b0e18a..837d7d012b7b 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -214,9 +214,9 @@ void free_rmid(u32 rmid)
list_add_tail(&entry->list, &rmid_free_lru);
}
-static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr)
+static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
{
- u64 shift = 64 - MBM_CNTR_WIDTH, chunks;
+ u64 shift = 64 - width, chunks;
chunks = (cur_msr << shift) - (prev_msr << shift);
return chunks >>= shift;
@@ -256,7 +256,7 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr)
return 0;
}
- chunks = mbm_overflow_count(m->prev_msr, tval);
+ chunks = mbm_overflow_count(m->prev_msr, tval, rr->r->mbm_width);
m->chunks += chunks;
m->prev_msr = tval;
@@ -278,7 +278,7 @@ static void mbm_bw_count(u32 rmid, struct rmid_read *rr)
if (tval & (RMID_VAL_ERROR | RMID_VAL_UNAVAIL))
return;
- chunks = mbm_overflow_count(m->prev_bw_msr, tval);
+ chunks = mbm_overflow_count(m->prev_bw_msr, tval, rr->r->mbm_width);
m->chunks_bw += chunks;
m->chunks = m->chunks_bw;
cur_bw = (chunks * r->mon_scale) >> 20;
@@ -433,11 +433,12 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
}
}
-static void mbm_update(struct rdt_domain *d, int rmid)
+static void mbm_update(struct rdt_resource *r, struct rdt_domain *d, int rmid)
{
struct rmid_read rr;
rr.first = false;
+ rr.r = r;
rr.d = d;
/*
@@ -510,6 +511,7 @@ void mbm_handle_overflow(struct work_struct *work)
struct rdtgroup *prgrp, *crgrp;
int cpu = smp_processor_id();
struct list_head *head;
+ struct rdt_resource *r;
struct rdt_domain *d;
mutex_lock(&rdtgroup_mutex);
@@ -517,16 +519,18 @@ void mbm_handle_overflow(struct work_struct *work)
if (!static_branch_likely(&rdt_mon_enable_key))
goto out_unlock;
- d = get_domain_from_cpu(cpu, &rdt_resources_all[RDT_RESOURCE_L3]);
+ r = &rdt_resources_all[RDT_RESOURCE_L3];
+
+ d = get_domain_from_cpu(cpu, r);
if (!d)
goto out_unlock;
list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
- mbm_update(d, prgrp->mon.rmid);
+ mbm_update(r, d, prgrp->mon.rmid);
head = &prgrp->mon.crdtgrp_list;
list_for_each_entry(crgrp, head, mon.crdtgrp_list)
- mbm_update(d, crgrp->mon.rmid);
+ mbm_update(r, d, crgrp->mon.rmid);
if (is_mba_sc(NULL))
update_mba_bw(prgrp, d);
@@ -614,11 +618,18 @@ static void l3_mon_evt_init(struct rdt_resource *r)
int rdt_get_mon_l3_config(struct rdt_resource *r)
{
+ unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
unsigned int cl_size = boot_cpu_data.x86_cache_size;
int ret;
r->mon_scale = boot_cpu_data.x86_cache_occ_scale;
r->num_rmid = boot_cpu_data.x86_cache_max_rmid + 1;
+ r->mbm_width = MBM_CNTR_WIDTH_BASE;
+
+ if (mbm_offset > 0 && mbm_offset <= MBM_CNTR_WIDTH_OFFSET_MAX)
+ r->mbm_width += mbm_offset;
+ else if (mbm_offset > MBM_CNTR_WIDTH_OFFSET_MAX)
+ pr_warn("Ignoring impossible MBM counter offset\n");
/*
* A reasonable upper limit on the max threshold is the number
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index d7623e1b927d..4bd28b388a1a 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -24,7 +24,7 @@
#include <asm/cacheflush.h>
#include <asm/intel-family.h>
-#include <asm/resctrl_sched.h>
+#include <asm/resctrl.h>
#include <asm/perf_event.h>
#include "../../events/perf_event.h" /* For X86_CONFIG() */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 5a359d9fcc05..d7cb5ab0d1f0 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -29,7 +29,7 @@
#include <uapi/linux/magic.h>
-#include <asm/resctrl_sched.h>
+#include <asm/resctrl.h>
#include "internal.h"
DEFINE_STATIC_KEY_FALSE(rdt_enable_key);
@@ -2472,7 +2472,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
goto out_destroy;
if (is_mbm_event(mevt->evtid))
- mon_event_read(&rr, d, prgrp, mevt->evtid, true);
+ mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
}
kernfs_activate(kn);
return 0;