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Date:   Mon, 05 Jul 2021 07:53:37 -0000
From:   "tip-bot2 for Kan Liang" <tip-bot2@linutronix.de>
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Subject: [tip: perf/core] perf/x86/intel/uncore: Support IMC free-running
 counters on Sapphire Rapids server
Cc:     Kan Liang <kan.liang@linux.intel.com>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Andi Kleen <ak@linux.intel.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org
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The following commit has been merged into the perf/core branch of tip:

Commit-ID:     c76826a65f50038f050424365dbf3f97203f8710
Gitweb:        https://git.kernel.org/tip/c76826a65f50038f050424365dbf3f97203f8710
Author:        Kan Liang <kan.liang@linux.intel.com>
AuthorDate:    Wed, 30 Jun 2021 14:08:39 -07:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 02 Jul 2021 15:58:42 +02:00

perf/x86/intel/uncore: Support IMC free-running counters on Sapphire Rapids server

Several free-running counters for IMC uncore blocks are supported on
Sapphire Rapids server.

They are not enumerated in the discovery tables. The number of the
free-running counter boxes is calculated from the number of
corresponding standard boxes.

The snbep_pci2phy_map_init() is invoked to setup the mapping from a PCI
BUS to a Die ID, which is used to locate the corresponding MC device of
a IMC uncore unit in the spr_uncore_imc_freerunning_init_box().

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lore.kernel.org/r/1625087320-194204-16-git-send-email-kan.liang@linux.intel.com
---
 arch/x86/events/intel/uncore_snbep.c | 66 ++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 9882549..2558e26 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -5753,6 +5753,7 @@ static struct intel_uncore_type spr_uncore_mdf = {
 
 #define UNCORE_SPR_NUM_UNCORE_TYPES		12
 #define UNCORE_SPR_IIO				1
+#define UNCORE_SPR_IMC				6
 
 static struct intel_uncore_type *spr_uncores[UNCORE_SPR_NUM_UNCORE_TYPES] = {
 	&spr_uncore_chabox,
@@ -5849,12 +5850,65 @@ static struct intel_uncore_type spr_uncore_iio_free_running = {
 	.format_group		= &skx_uncore_iio_freerunning_format_group,
 };
 
+enum perf_uncore_spr_imc_freerunning_type_id {
+	SPR_IMC_DCLK,
+	SPR_IMC_PQ_CYCLES,
+
+	SPR_IMC_FREERUNNING_TYPE_MAX,
+};
+
+static struct freerunning_counters spr_imc_freerunning[] = {
+	[SPR_IMC_DCLK]		= { 0x22b0, 0x0, 0, 1, 48 },
+	[SPR_IMC_PQ_CYCLES]	= { 0x2318, 0x8, 0, 2, 48 },
+};
+
+static struct uncore_event_desc spr_uncore_imc_freerunning_events[] = {
+	INTEL_UNCORE_EVENT_DESC(dclk,			"event=0xff,umask=0x10"),
+
+	INTEL_UNCORE_EVENT_DESC(rpq_cycles,		"event=0xff,umask=0x20"),
+	INTEL_UNCORE_EVENT_DESC(wpq_cycles,		"event=0xff,umask=0x21"),
+	{ /* end: all zeroes */ },
+};
+
+#define SPR_MC_DEVICE_ID	0x3251
+
+static void spr_uncore_imc_freerunning_init_box(struct intel_uncore_box *box)
+{
+	int mem_offset = box->pmu->pmu_idx * ICX_IMC_MEM_STRIDE + SNR_IMC_MMIO_MEM0_OFFSET;
+
+	snr_uncore_mmio_map(box, uncore_mmio_box_ctl(box),
+			    mem_offset, SPR_MC_DEVICE_ID);
+}
+
+static struct intel_uncore_ops spr_uncore_imc_freerunning_ops = {
+	.init_box	= spr_uncore_imc_freerunning_init_box,
+	.exit_box	= uncore_mmio_exit_box,
+	.read_counter	= uncore_mmio_read_counter,
+	.hw_config	= uncore_freerunning_hw_config,
+};
+
+static struct intel_uncore_type spr_uncore_imc_free_running = {
+	.name			= "imc_free_running",
+	.num_counters		= 3,
+	.mmio_map_size		= SNR_IMC_MMIO_SIZE,
+	.num_freerunning_types	= SPR_IMC_FREERUNNING_TYPE_MAX,
+	.freerunning		= spr_imc_freerunning,
+	.ops			= &spr_uncore_imc_freerunning_ops,
+	.event_descs		= spr_uncore_imc_freerunning_events,
+	.format_group		= &skx_uncore_iio_freerunning_format_group,
+};
+
 #define UNCORE_SPR_MSR_EXTRA_UNCORES		1
+#define UNCORE_SPR_MMIO_EXTRA_UNCORES		1
 
 static struct intel_uncore_type *spr_msr_uncores[UNCORE_SPR_MSR_EXTRA_UNCORES] = {
 	&spr_uncore_iio_free_running,
 };
 
+static struct intel_uncore_type *spr_mmio_uncores[UNCORE_SPR_MMIO_EXTRA_UNCORES] = {
+	&spr_uncore_imc_free_running,
+};
+
 static void uncore_type_customized_copy(struct intel_uncore_type *to_type,
 					struct intel_uncore_type *from_type)
 {
@@ -5957,7 +6011,17 @@ int spr_uncore_pci_init(void)
 
 void spr_uncore_mmio_init(void)
 {
-	uncore_mmio_uncores = uncore_get_uncores(UNCORE_ACCESS_MMIO, 0, NULL);
+	int ret = snbep_pci2phy_map_init(0x3250, SKX_CPUNODEID, SKX_GIDNIDMAP, true);
+
+	if (ret)
+		uncore_mmio_uncores = uncore_get_uncores(UNCORE_ACCESS_MMIO, 0, NULL);
+	else {
+		uncore_mmio_uncores = uncore_get_uncores(UNCORE_ACCESS_MMIO,
+							 UNCORE_SPR_MMIO_EXTRA_UNCORES,
+							 spr_mmio_uncores);
+
+		spr_uncore_imc_free_running.num_boxes = uncore_type_max_boxes(uncore_mmio_uncores, UNCORE_SPR_IMC) / 2;
+	}
 }
 
 /* end of SPR uncore support */