drivers/iommu/intel/perfmon.h

Source file repositories/reference/linux-study-clean/drivers/iommu/intel/perfmon.h

File Facts

System
Linux kernel
Corpus path
drivers/iommu/intel/perfmon.h
Extension
.h
Size
1655 bytes
Lines
65
Domain
Driver Families
Bucket
drivers/iommu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#define IOMMU_PMU_NUM_OFF_REGS			4
#define IOMMU_PMU_OFF_REGS_STEP			4

#define IOMMU_PMU_FILTER_REQUESTER_ID		0x01
#define IOMMU_PMU_FILTER_DOMAIN			0x02
#define IOMMU_PMU_FILTER_PASID			0x04
#define IOMMU_PMU_FILTER_ATS			0x08
#define IOMMU_PMU_FILTER_PAGE_TABLE		0x10

#define IOMMU_PMU_FILTER_EN			BIT(31)

#define IOMMU_PMU_CFG_OFFSET			0x100
#define IOMMU_PMU_CFG_CNTRCAP_OFFSET		0x80
#define IOMMU_PMU_CFG_CNTREVCAP_OFFSET		0x84
#define IOMMU_PMU_CFG_SIZE			0x8
#define IOMMU_PMU_CFG_FILTERS_OFFSET		0x4

#define IOMMU_PMU_CAP_REGS_STEP			8

#define iommu_cntrcap_pcc(p)			((p) & 0x1)
#define iommu_cntrcap_cw(p)			(((p) >> 8) & 0xff)
#define iommu_cntrcap_ios(p)			(((p) >> 16) & 0x1)
#define iommu_cntrcap_egcnt(p)			(((p) >> 28) & 0xf)

#define IOMMU_EVENT_CFG_EGI_SHIFT		8
#define IOMMU_EVENT_CFG_ES_SHIFT		32
#define IOMMU_EVENT_CFG_INT			BIT_ULL(1)

#define iommu_event_select(p)			((p) & 0xfffffff)
#define iommu_event_group(p)			(((p) >> 28) & 0xf)

#ifdef CONFIG_INTEL_IOMMU_PERF_EVENTS
int alloc_iommu_pmu(struct intel_iommu *iommu);
void free_iommu_pmu(struct intel_iommu *iommu);
void iommu_pmu_register(struct intel_iommu *iommu);
void iommu_pmu_unregister(struct intel_iommu *iommu);
#else
static inline int
alloc_iommu_pmu(struct intel_iommu *iommu)
{
	return 0;
}

static inline void
free_iommu_pmu(struct intel_iommu *iommu)
{
}

static inline void
iommu_pmu_register(struct intel_iommu *iommu)
{
}

static inline void
iommu_pmu_unregister(struct intel_iommu *iommu)
{
}
#endif /* CONFIG_INTEL_IOMMU_PERF_EVENTS */

Annotation

Implementation Notes