From: "Steven L. Kinney" <[email protected]> Add functionality to check the availability of the AMD IOMMUv2 Performance Counters and export this functionality to other core drivers, such as in this case, a perf IOMMUv2 PMU. This feature is not bound to any specific AMD family/model other than the presence of the IOMMUv2 with PC enabled.
The IOMMUv2 PC support static counting only at this time. Signed-off-by: Steven L. Kinney <[email protected]> --- drivers/iommu/Kconfig | 10 ++++ drivers/iommu/amd_iommu_init.c | 99 +++++++++++++++++++++++++++++++++++++++ drivers/iommu/amd_iommu_types.h | 12 +++++ 3 files changed, 121 insertions(+) diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index e39f9db..4a941dd 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -73,6 +73,16 @@ config AMD_IOMMU_V2 hardware. Select this option if you want to use devices that support the PCI PRI and PASID interface. +# AMD IOMMUv2 Performance Counter support +config AMD_IOMMU_V2_PC + bool "AMD IOMMUv2 Performance Counter (EXPERIMENTAL)" + depends on AMD_IOMMU_V2 + ---help--- + This option enables support for AMD IOMMUv2 Performance Counters. + Select this option if you want to enable IOMMUv2 Performance + Counter support. + If unsure, say N. + # Intel IOMMU support config DMAR_TABLE bool diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 81837b0..f38db14 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -154,6 +154,7 @@ bool amd_iommu_iotlb_sup __read_mostly = true; u32 amd_iommu_max_pasids __read_mostly = ~0; bool amd_iommu_v2_present __read_mostly; +bool amd_iommu_v2_pc_present __read_mostly; bool amd_iommu_force_isolation __read_mostly; @@ -1145,6 +1146,21 @@ static int iommu_init_pci(struct amd_iommu *iommu) if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE)) amd_iommu_np_cache = true; +#ifdef CONFIG_AMD_IOMMU_V2_PC + if (iommu_feature(iommu, FEATURE_PC)) { + u32 val; + amd_iommu_v2_pc_present = true; + dev_printk(KERN_DEBUG, &iommu->dev->dev, + "AMD-Vi: IOMMUv2 perf counters supported\n"); + val = readl(iommu->mmio_base + MMIO_CNTR_CONF_OFFSET); + iommu->max_banks = (u8) ((val >> 12) & 0x3f); + iommu->max_counters = (u8) ((val >> 7) & 0xf); + dev_printk(KERN_DEBUG, &iommu->dev->dev, + "AMD-Vi: %d counter banks, %d counters each\n", + iommu->max_banks, iommu->max_counters); + } +#endif + if (is_rd890_iommu(iommu->dev)) { int i, j; @@ -2076,3 +2092,86 @@ bool amd_iommu_v2_supported(void) return amd_iommu_v2_present; } EXPORT_SYMBOL(amd_iommu_v2_supported); + +#ifdef CONFIG_AMD_IOMMU_V2_PC +/**************************************************************************** + * + * IOMMUv2 EFR Performance Counter support functionality. This code allows + * access to the IOMMUv2 PC functionality. + * + ****************************************************************************/ + +u8 amd_iommu_v2_get_max_pc_banks(u16 devid) +{ + struct amd_iommu *iommu; + + /* locate the iommu governing the devid */ + iommu = amd_iommu_rlookup_table[devid]; + + if (iommu) + return iommu->max_banks; + + return -ENODEV; +} +EXPORT_SYMBOL(amd_iommu_v2_get_max_pc_banks); + +bool amd_iommu_v2_pc_supported(void) +{ + return amd_iommu_v2_pc_present; +} +EXPORT_SYMBOL(amd_iommu_v2_pc_supported); + +u8 amd_iommu_v2_get_max_pc_counters(u16 devid) +{ + struct amd_iommu *iommu; + + /* locate the iommu governing the devid */ + iommu = amd_iommu_rlookup_table[devid]; + + if (iommu) + return iommu->max_counters; + + return -ENODEV; +} +EXPORT_SYMBOL(amd_iommu_v2_get_max_pc_counters); + +int amd_iommu_v2_get_set_pc_reg_val(u16 devid, u8 bank, u8 cntr, u8 fxn, + long long *value, bool is_write) +{ + struct amd_iommu *iommu; + u32 offset; + u32 max_offset_lim; + + /* Make sure the IOMMUv2 PC resource is available */ + if (!amd_iommu_v2_pc_present) { + pr_info("AMD IOMMUv2 - PC Not supported in amd_iommu_v2_get_set_pc_reg_val\n"); + return -ENODEV; + } + + /* locate the iommu associated with the device ID */ + iommu = amd_iommu_rlookup_table[devid]; + if (iommu == NULL) + return -ENODEV; + + /* check for valid iommu pc register indexing */ + if (fxn < 0 || fxn > 0x28 || (fxn & 7)) + return -ENODEV; + + offset = (u32)(((0x40|bank) << 12) | (cntr << 8) | fxn); + + /* limit the offset to the hw defined mmio region aperture */ + max_offset_lim = (u32)(((0x40|iommu->max_banks) << 12) | + (iommu->max_counters << 8) | 0x28); + if ((offset < IOMMU_V2_PC_REG_OFFSET) || + (offset > max_offset_lim)) + return -EINVAL; + + if (is_write) + writel((u32)*value, iommu->mmio_base + offset); + else + *value = readl(iommu->mmio_base + offset); + + return 0; +} +EXPORT_SYMBOL(amd_iommu_v2_get_set_pc_reg_val); +#endif diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h index e38ab43..fdf236b 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -38,7 +38,12 @@ #define RLOOKUP_TABLE_ENTRY_SIZE (sizeof(void *)) /* Length of the MMIO region for the AMD IOMMU */ +#ifdef CONFIG_AMD_IOMMU_V2_PC +#define MMIO_REGION_LENGTH 0x80000 +#define IOMMU_V2_PC_REG_OFFSET 0x40000 +#else #define MMIO_REGION_LENGTH 0x4000 +#endif /* Capability offsets used by the driver */ #define MMIO_CAP_HDR_OFFSET 0x00 @@ -77,6 +82,7 @@ #define MMIO_STATUS_OFFSET 0x2020 #define MMIO_PPR_HEAD_OFFSET 0x2030 #define MMIO_PPR_TAIL_OFFSET 0x2038 +#define MMIO_CNTR_CONF_OFFSET 0x4000 /* Extended Feature Bits */ @@ -585,6 +591,12 @@ struct amd_iommu { /* The l2 indirect registers */ u32 stored_l2[0x83]; + +#ifdef CONFIG_AMD_IOMMU_V2_PC + /* The maximum PC banks and counters/bank (PCSup=1) */ + u8 max_banks; + u8 max_counters; +#endif }; struct devid_map { -- 1.7.9.5 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
