linux-kernel - [PATCH 2/5] perf/x86/intel/uncore: Factor out common MMIO init and ops functions

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Message-Id: <20240731141353.759643-2-kan.liang@linux.intel.com>
Date: Wed, 31 Jul 2024 07:13:50 -0700
From: kan.liang@...ux.intel.com
To: peterz@...radead.org,
	mingo@...hat.com,
	linux-kernel@...r.kernel.org
Cc: acme@...nel.org,
	namhyung@...nel.org,
	irogers@...gle.com,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 2/5] perf/x86/intel/uncore: Factor out common MMIO init and ops functions

From: Kan Liang <kan.liang@...ux.intel.com>

Some uncore PMON registers are located in the MMIO space. For the client
machine, the MMIO space is usually located at D0:F0 but in a different
BAR. For example, some uncore PMON registers are located in the SAF BAR,
not the MCHBAR in the Lunar Lake.

The current __uncore_imc_init_box() hard code the BAR information.
Factor out the uncore_get_box_mmio_addr() which uses the BAR information
as a parameter.
The only change is the error output message. The hardcode name 'MCHBAR'
is replaced by the offset of a BAR.

Add a new macro, MMIO_UNCORE_COMMON_OPS(), since the MMIO ops functions
are usually the same among different generations.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/intel/uncore_snb.c | 47 +++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 17 deletions(-)

diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
index 9462fd9f3b7a..05fe6e90bd8e 100644
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -1481,33 +1481,35 @@ static struct pci_dev *tgl_uncore_get_mc_dev(void)
 #define TGL_UNCORE_MMIO_IMC_MEM_OFFSET		0x10000
 #define TGL_UNCORE_PCI_IMC_MAP_SIZE		0xe000
 
-static void __uncore_imc_init_box(struct intel_uncore_box *box,
-				  unsigned int base_offset)
+static void
+uncore_get_box_mmio_addr(struct intel_uncore_box *box,
+			 unsigned int base_offset,
+			 int bar_offset, int step)
 {
 	struct pci_dev *pdev = tgl_uncore_get_mc_dev();
 	struct intel_uncore_pmu *pmu = box->pmu;
 	struct intel_uncore_type *type = pmu->type;
 	resource_size_t addr;
-	u32 mch_bar;
+	u32 bar;
 
 	if (!pdev) {
 		pr_warn("perf uncore: Cannot find matched IMC device.\n");
 		return;
 	}
 
-	pci_read_config_dword(pdev, SNB_UNCORE_PCI_IMC_BAR_OFFSET, &mch_bar);
-	/* MCHBAR is disabled */
-	if (!(mch_bar & BIT(0))) {
-		pr_warn("perf uncore: MCHBAR is disabled. Failed to map IMC free-running counters.\n");
+	pci_read_config_dword(pdev, bar_offset, &bar);
+	if (!(bar & BIT(0))) {
+		pr_warn("perf uncore: BAR 0x%x is disabled. Failed to map %s counters.\n",
+			bar_offset, type->name);
 		pci_dev_put(pdev);
 		return;
 	}
-	mch_bar &= ~BIT(0);
-	addr = (resource_size_t)(mch_bar + TGL_UNCORE_MMIO_IMC_MEM_OFFSET * pmu->pmu_idx);
+	bar &= ~BIT(0);
+	addr = (resource_size_t)(bar + step * pmu->pmu_idx);
 
 #ifdef CONFIG_PHYS_ADDR_T_64BIT
-	pci_read_config_dword(pdev, SNB_UNCORE_PCI_IMC_BAR_OFFSET + 4, &mch_bar);
-	addr |= ((resource_size_t)mch_bar << 32);
+	pci_read_config_dword(pdev, bar_offset + 4, &bar);
+	addr |= ((resource_size_t)bar << 32);
 #endif
 
 	addr += base_offset;
@@ -1518,6 +1520,14 @@ static void __uncore_imc_init_box(struct intel_uncore_box *box,
 	pci_dev_put(pdev);
 }
 
+static void __uncore_imc_init_box(struct intel_uncore_box *box,
+				  unsigned int base_offset)
+{
+	uncore_get_box_mmio_addr(box, base_offset,
+				 SNB_UNCORE_PCI_IMC_BAR_OFFSET,
+				 TGL_UNCORE_MMIO_IMC_MEM_OFFSET);
+}
+
 static void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box)
 {
 	__uncore_imc_init_box(box, 0);
@@ -1612,14 +1622,17 @@ static void adl_uncore_mmio_enable_box(struct intel_uncore_box *box)
 	writel(0, box->io_addr + uncore_mmio_box_ctl(box));
 }
 
+#define MMIO_UNCORE_COMMON_OPS()				\
+	.exit_box	= uncore_mmio_exit_box,		\
+	.disable_box	= adl_uncore_mmio_disable_box,	\
+	.enable_box	= adl_uncore_mmio_enable_box,	\
+	.disable_event	= intel_generic_uncore_mmio_disable_event,	\
+	.enable_event	= intel_generic_uncore_mmio_enable_event,	\
+	.read_counter	= uncore_mmio_read_counter,
+
 static struct intel_uncore_ops adl_uncore_mmio_ops = {
 	.init_box	= adl_uncore_imc_init_box,
-	.exit_box	= uncore_mmio_exit_box,
-	.disable_box	= adl_uncore_mmio_disable_box,
-	.enable_box	= adl_uncore_mmio_enable_box,
-	.disable_event	= intel_generic_uncore_mmio_disable_event,
-	.enable_event	= intel_generic_uncore_mmio_enable_event,
-	.read_counter	= uncore_mmio_read_counter,
+	MMIO_UNCORE_COMMON_OPS()
 };
 
 #define ADL_UNC_CTL_CHMASK_MASK			0x00000f00
-- 
2.38.1