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Subject[PATCH 3/5] perf/x86/intel/uncore: Support MMIO type uncore blocks
Date
From: Kan Liang <kan.liang@linux.intel.com>

A new MMIO type uncore box is introduced on Snow Ridge server. The
counters of MMIO type uncore box can only be accessed by MMIO.

Add a new uncore type, uncore_mmio_uncores, for MMIO type uncore blocks.

Support MMIO type uncore blocks in CPU hot plug. The MMIO space has to
be map/unmap for the first/last CPU. The context also need to be
migrated if the bind CPU changes.

Add mmio_init() to init and register PMUs for MMIO type uncore blocks.

Add a helper to calculate the box_ctl address.

The helpers which calculate ctl/ctr can be shared with PCI type uncore
blocks.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
arch/x86/events/intel/uncore.c | 51 ++++++++++++++++++++++++++++++++++++------
arch/x86/events/intel/uncore.h | 21 ++++++++++++-----
2 files changed, 60 insertions(+), 12 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 0b72ca5..3c00635 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -7,6 +7,7 @@
static struct intel_uncore_type *empty_uncore[] = { NULL, };
struct intel_uncore_type **uncore_msr_uncores = empty_uncore;
struct intel_uncore_type **uncore_pci_uncores = empty_uncore;
+struct intel_uncore_type **uncore_mmio_uncores = empty_uncore;

static bool pcidrv_registered;
struct pci_driver *uncore_pci_driver;
@@ -1175,12 +1176,14 @@ static int uncore_event_cpu_offline(unsigned int cpu)
target = -1;

uncore_change_context(uncore_msr_uncores, cpu, target);
+ uncore_change_context(uncore_mmio_uncores, cpu, target);
uncore_change_context(uncore_pci_uncores, cpu, target);

unref:
/* Clear the references */
pkg = topology_logical_package_id(cpu);
uncore_box_unref(uncore_msr_uncores, pkg);
+ uncore_box_unref(uncore_mmio_uncores, pkg);
return 0;
}

@@ -1248,12 +1251,13 @@ static int uncore_box_ref(struct intel_uncore_type **types,

static int uncore_event_cpu_online(unsigned int cpu)
{
- int ret, pkg, target;
+ int pkg, target, msr_ret, mmio_ret;

pkg = topology_logical_package_id(cpu);
- ret = uncore_box_ref(uncore_msr_uncores, pkg, cpu);
- if (ret)
- return ret;
+ msr_ret = uncore_box_ref(uncore_msr_uncores, pkg, cpu);
+ mmio_ret = uncore_box_ref(uncore_mmio_uncores, pkg, cpu);
+ if (msr_ret && mmio_ret)
+ return -ENOMEM;

/*
* Check if there is an online cpu in the package
@@ -1265,7 +1269,10 @@ static int uncore_event_cpu_online(unsigned int cpu)

cpumask_set_cpu(cpu, &uncore_cpu_mask);

- uncore_change_context(uncore_msr_uncores, -1, cpu);
+ if (!msr_ret)
+ uncore_change_context(uncore_msr_uncores, -1, cpu);
+ if (!mmio_ret)
+ uncore_change_context(uncore_mmio_uncores, -1, cpu);
uncore_change_context(uncore_pci_uncores, -1, cpu);
return 0;
}
@@ -1313,12 +1320,35 @@ static int __init uncore_cpu_init(void)
return ret;
}

+static int __init uncore_mmio_init(void)
+{
+ struct intel_uncore_type **types = uncore_mmio_uncores;
+ int ret;
+
+ ret = uncore_types_init(types, true);
+ if (ret)
+ goto err;
+
+ for (; *types; types++) {
+ ret = type_pmu_register(*types);
+ if (ret)
+ goto err;
+ }
+ return 0;
+err:
+ uncore_types_exit(uncore_mmio_uncores);
+ uncore_mmio_uncores = empty_uncore;
+ return ret;
+}
+
+
#define X86_UNCORE_MODEL_MATCH(model, init) \
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&init }

struct intel_uncore_init_fun {
void (*cpu_init)(void);
int (*pci_init)(void);
+ void (*mmio_init)(void);
};

static const struct intel_uncore_init_fun nhm_uncore_init __initconst = {
@@ -1431,7 +1461,7 @@ static int __init intel_uncore_init(void)
{
const struct x86_cpu_id *id;
struct intel_uncore_init_fun *uncore_init;
- int pret = 0, cret = 0, ret;
+ int pret = 0, cret = 0, mret = 0, ret;

id = x86_match_cpu(intel_uncore_match);
if (!id)
@@ -1454,7 +1484,12 @@ static int __init intel_uncore_init(void)
cret = uncore_cpu_init();
}

- if (cret && pret)
+ if (uncore_init->mmio_init) {
+ uncore_init->mmio_init();
+ mret = uncore_mmio_init();
+ }
+
+ if (cret && pret && mret)
return -ENODEV;

/* Install hotplug callbacks to setup the targets for each package */
@@ -1468,6 +1503,7 @@ static int __init intel_uncore_init(void)

err:
uncore_types_exit(uncore_msr_uncores);
+ uncore_types_exit(uncore_mmio_uncores);
uncore_pci_exit();
return ret;
}
@@ -1477,6 +1513,7 @@ static void __exit intel_uncore_exit(void)
{
cpuhp_remove_state(CPUHP_AP_PERF_X86_UNCORE_ONLINE);
uncore_types_exit(uncore_msr_uncores);
+ uncore_types_exit(uncore_mmio_uncores);
uncore_pci_exit();
}
module_exit(intel_uncore_exit);
diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index 5e97e5e..426a490 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -56,7 +56,10 @@ struct intel_uncore_type {
unsigned fixed_ctr;
unsigned fixed_ctl;
unsigned box_ctl;
- unsigned msr_offset;
+ union {
+ unsigned msr_offset;
+ unsigned mmio_offset;
+ };
unsigned num_shared_regs:8;
unsigned single_fixed:1;
unsigned pair_ctr_ctl:1;
@@ -190,6 +193,13 @@ static inline bool uncore_pmc_freerunning(int idx)
return idx == UNCORE_PMC_IDX_FREERUNNING;
}

+static inline
+unsigned int uncore_mmio_box_ctl(struct intel_uncore_box *box)
+{
+ return box->pmu->type->box_ctl +
+ box->pmu->type->mmio_offset * box->pmu->pmu_idx;
+}
+
static inline unsigned uncore_pci_box_ctl(struct intel_uncore_box *box)
{
return box->pmu->type->box_ctl;
@@ -330,7 +340,7 @@ unsigned uncore_msr_perf_ctr(struct intel_uncore_box *box, int idx)
static inline
unsigned uncore_fixed_ctl(struct intel_uncore_box *box)
{
- if (box->pci_dev)
+ if (box->pci_dev || box->io_addr)
return uncore_pci_fixed_ctl(box);
else
return uncore_msr_fixed_ctl(box);
@@ -339,7 +349,7 @@ unsigned uncore_fixed_ctl(struct intel_uncore_box *box)
static inline
unsigned uncore_fixed_ctr(struct intel_uncore_box *box)
{
- if (box->pci_dev)
+ if (box->pci_dev || box->io_addr)
return uncore_pci_fixed_ctr(box);
else
return uncore_msr_fixed_ctr(box);
@@ -348,7 +358,7 @@ unsigned uncore_fixed_ctr(struct intel_uncore_box *box)
static inline
unsigned uncore_event_ctl(struct intel_uncore_box *box, int idx)
{
- if (box->pci_dev)
+ if (box->pci_dev || box->io_addr)
return uncore_pci_event_ctl(box, idx);
else
return uncore_msr_event_ctl(box, idx);
@@ -357,7 +367,7 @@ unsigned uncore_event_ctl(struct intel_uncore_box *box, int idx)
static inline
unsigned uncore_perf_ctr(struct intel_uncore_box *box, int idx)
{
- if (box->pci_dev)
+ if (box->pci_dev || box->io_addr)
return uncore_pci_perf_ctr(box, idx);
else
return uncore_msr_perf_ctr(box, idx);
@@ -507,6 +517,7 @@ u64 uncore_shared_reg_config(struct intel_uncore_box *box, int idx);

extern struct intel_uncore_type **uncore_msr_uncores;
extern struct intel_uncore_type **uncore_pci_uncores;
+extern struct intel_uncore_type **uncore_mmio_uncores;
extern struct pci_driver *uncore_pci_driver;
extern raw_spinlock_t pci2phy_map_lock;
extern struct list_head pci2phy_map_head;
--
2.7.4
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