Re: [PATCH 01/11] RISC-V: drivers/iommu: Add RISC-V IOMMU - Ziommu support.
From: Zong Li
Date: Thu Jul 27 2023 - 22:43:50 EST
On Thu, Jul 20, 2023 at 3:34 AM Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> wrote:
>
> The patch introduces skeleton IOMMU device driver implementation as defined
> by RISC-V IOMMU Architecture Specification, Version 1.0 [1], with minimal support
> for pass-through mapping, basic initialization and bindings for platform and PCIe
> hardware implementations.
>
> Series of patches following specification evolution has been reorganized to provide
> functional separation of implemented blocks, compliant with ratified specification.
>
> This and following patch series includes code contributed by: Nick Kossifidis
> <mick@xxxxxxxxxxxx> (iommu-platform device, number of specification clarification
> and bugfixes and readability improvements), Sebastien Boeuf <seb@xxxxxxxxxxxx> (page
> table creation, ATS/PGR flow).
>
> Complete history can be found at the maintainer's repository branch [2].
>
> Device driver enables RISC-V 32/64 support for memory translation for DMA capable
> PCI and platform devices, multilevel device directory table, process directory,
> shared virtual address support, wired and message signaled interrupt for translation
> I/O fault, page request interface and command processing.
>
> Matching RISCV-V IOMMU device emulation implementation is available for QEMU project,
> along with educational device extensions for PASID ATS/PRI support [3].
>
> References:
> - [1] https://github.com/riscv-non-isa/riscv-iommu
> - [2] https://github.com/tjeznach/linux/tree/tjeznach/riscv-iommu
> - [3] https://github.com/tjeznach/qemu/tree/tjeznach/riscv-iommu
>
> Co-developed-by: Nick Kossifidis <mick@xxxxxxxxxxxx>
> Signed-off-by: Nick Kossifidis <mick@xxxxxxxxxxxx>
> Co-developed-by: Sebastien Boeuf <seb@xxxxxxxxxxxx>
> Signed-off-by: Sebastien Boeuf <seb@xxxxxxxxxxxx>
> Signed-off-by: Tomasz Jeznach <tjeznach@xxxxxxxxxxxx>
> ---
> drivers/iommu/Kconfig | 1 +
> drivers/iommu/Makefile | 2 +-
> drivers/iommu/riscv/Kconfig | 22 +
> drivers/iommu/riscv/Makefile | 1 +
> drivers/iommu/riscv/iommu-bits.h | 704 +++++++++++++++++++++++++++
> drivers/iommu/riscv/iommu-pci.c | 134 +++++
> drivers/iommu/riscv/iommu-platform.c | 94 ++++
> drivers/iommu/riscv/iommu.c | 660 +++++++++++++++++++++++++
> drivers/iommu/riscv/iommu.h | 115 +++++
> 9 files changed, 1732 insertions(+), 1 deletion(-)
> create mode 100644 drivers/iommu/riscv/Kconfig
> create mode 100644 drivers/iommu/riscv/Makefile
> create mode 100644 drivers/iommu/riscv/iommu-bits.h
> create mode 100644 drivers/iommu/riscv/iommu-pci.c
> create mode 100644 drivers/iommu/riscv/iommu-platform.c
> create mode 100644 drivers/iommu/riscv/iommu.c
> create mode 100644 drivers/iommu/riscv/iommu.h
>
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index 2b12b583ef4b..36fcc6fd5b4e 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -187,6 +187,7 @@ config MSM_IOMMU
> source "drivers/iommu/amd/Kconfig"
> source "drivers/iommu/intel/Kconfig"
> source "drivers/iommu/iommufd/Kconfig"
> +source "drivers/iommu/riscv/Kconfig"
>
> config IRQ_REMAP
> bool "Support for Interrupt Remapping"
> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
> index 769e43d780ce..8f57110a9fb1 100644
> --- a/drivers/iommu/Makefile
> +++ b/drivers/iommu/Makefile
> @@ -1,5 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> -obj-y += amd/ intel/ arm/ iommufd/
> +obj-y += amd/ intel/ arm/ iommufd/ riscv/
> obj-$(CONFIG_IOMMU_API) += iommu.o
> obj-$(CONFIG_IOMMU_API) += iommu-traces.o
> obj-$(CONFIG_IOMMU_API) += iommu-sysfs.o
> diff --git a/drivers/iommu/riscv/Kconfig b/drivers/iommu/riscv/Kconfig
> new file mode 100644
> index 000000000000..01d4043849d4
> --- /dev/null
> +++ b/drivers/iommu/riscv/Kconfig
> @@ -0,0 +1,22 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +# RISC-V IOMMU support
> +
> +config RISCV_IOMMU
> + bool "RISC-V IOMMU driver"
> + depends on RISCV
> + select IOMMU_API
> + select IOMMU_DMA
> + select IOMMU_SVA
> + select IOMMU_IOVA
> + select IOMMU_IO_PGTABLE
> + select IOASID
> + select PCI_MSI
> + select PCI_ATS
> + select PCI_PRI
> + select PCI_PASID
> + select MMU_NOTIFIER
> + help
> + Support for devices following RISC-V IOMMU specification.
> +
> + If unsure, say N here.
> +
> diff --git a/drivers/iommu/riscv/Makefile b/drivers/iommu/riscv/Makefile
> new file mode 100644
> index 000000000000..38730c11e4a8
> --- /dev/null
> +++ b/drivers/iommu/riscv/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_RISCV_IOMMU) += iommu.o iommu-pci.o iommu-platform.o
> \ No newline at end of file
> diff --git a/drivers/iommu/riscv/iommu-bits.h b/drivers/iommu/riscv/iommu-bits.h
> new file mode 100644
> index 000000000000..b2946793a73d
> --- /dev/null
> +++ b/drivers/iommu/riscv/iommu-bits.h
> @@ -0,0 +1,704 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright © 2022-2023 Rivos Inc.
> + * Copyright © 2023 FORTH-ICS/CARV
> + * Copyright © 2023 RISC-V IOMMU Task Group
> + *
> + * RISC-V Ziommu - Register Layout and Data Structures.
> + *
> + * Based on the 'RISC-V IOMMU Architecture Specification', Version 1.0
> + * Published at https://github.com/riscv-non-isa/riscv-iommu
> + *
> + */
> +
> +#ifndef _RISCV_IOMMU_BITS_H_
> +#define _RISCV_IOMMU_BITS_H_
> +
> +#include <linux/types.h>
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +
> +/*
> + * Chapter 5: Memory Mapped register interface
> + */
> +
> +/* Common field positions */
> +#define RISCV_IOMMU_PPN_FIELD GENMASK_ULL(53, 10)
> +#define RISCV_IOMMU_QUEUE_LOGSZ_FIELD GENMASK_ULL(4, 0)
> +#define RISCV_IOMMU_QUEUE_INDEX_FIELD GENMASK_ULL(31, 0)
> +#define RISCV_IOMMU_QUEUE_ENABLE BIT(0)
> +#define RISCV_IOMMU_QUEUE_INTR_ENABLE BIT(1)
> +#define RISCV_IOMMU_QUEUE_MEM_FAULT BIT(8)
> +#define RISCV_IOMMU_QUEUE_OVERFLOW BIT(9)
> +#define RISCV_IOMMU_QUEUE_ACTIVE BIT(16)
> +#define RISCV_IOMMU_QUEUE_BUSY BIT(17)
> +
> +#define RISCV_IOMMU_ATP_PPN_FIELD GENMASK_ULL(43, 0)
> +#define RISCV_IOMMU_ATP_MODE_FIELD GENMASK_ULL(63, 60)
> +
> +/* 5.3 IOMMU Capabilities (64bits) */
> +#define RISCV_IOMMU_REG_CAP 0x0000
> +#define RISCV_IOMMU_CAP_VERSION GENMASK_ULL(7, 0)
> +#define RISCV_IOMMU_CAP_S_SV32 BIT_ULL(8)
> +#define RISCV_IOMMU_CAP_S_SV39 BIT_ULL(9)
> +#define RISCV_IOMMU_CAP_S_SV48 BIT_ULL(10)
> +#define RISCV_IOMMU_CAP_S_SV57 BIT_ULL(11)
> +#define RISCV_IOMMU_CAP_SVPBMT BIT_ULL(15)
> +#define RISCV_IOMMU_CAP_G_SV32 BIT_ULL(16)
> +#define RISCV_IOMMU_CAP_G_SV39 BIT_ULL(17)
> +#define RISCV_IOMMU_CAP_G_SV48 BIT_ULL(18)
> +#define RISCV_IOMMU_CAP_G_SV57 BIT_ULL(19)
> +#define RISCV_IOMMU_CAP_MSI_FLAT BIT_ULL(22)
> +#define RISCV_IOMMU_CAP_MSI_MRIF BIT_ULL(23)
> +#define RISCV_IOMMU_CAP_AMO BIT_ULL(24)
> +#define RISCV_IOMMU_CAP_ATS BIT_ULL(25)
> +#define RISCV_IOMMU_CAP_T2GPA BIT_ULL(26)
> +#define RISCV_IOMMU_CAP_END BIT_ULL(27)
> +#define RISCV_IOMMU_CAP_IGS GENMASK_ULL(29, 28)
> +#define RISCV_IOMMU_CAP_HPM BIT_ULL(30)
> +#define RISCV_IOMMU_CAP_DBG BIT_ULL(31)
> +#define RISCV_IOMMU_CAP_PAS GENMASK_ULL(37, 32)
> +#define RISCV_IOMMU_CAP_PD8 BIT_ULL(38)
> +#define RISCV_IOMMU_CAP_PD17 BIT_ULL(39)
> +#define RISCV_IOMMU_CAP_PD20 BIT_ULL(40)
> +
> +#define RISCV_IOMMU_CAP_VERSION_VER_MASK 0xF0
> +#define RISCV_IOMMU_CAP_VERSION_REV_MASK 0x0F
> +
> +/**
> + * enum riscv_iommu_igs_settings - Interrupt Generation Support Settings
> + * @RISCV_IOMMU_CAP_IGS_MSI: I/O MMU supports only MSI generation
> + * @RISCV_IOMMU_CAP_IGS_WSI: I/O MMU supports only Wired-Signaled interrupt
> + * @RISCV_IOMMU_CAP_IGS_BOTH: I/O MMU supports both MSI and WSI generation
> + * @RISCV_IOMMU_CAP_IGS_RSRV: Reserved for standard use
> + */
> +enum riscv_iommu_igs_settings {
> + RISCV_IOMMU_CAP_IGS_MSI = 0,
> + RISCV_IOMMU_CAP_IGS_WSI = 1,
> + RISCV_IOMMU_CAP_IGS_BOTH = 2,
> + RISCV_IOMMU_CAP_IGS_RSRV = 3
> +};
> +
> +/* 5.4 Features control register (32bits) */
> +#define RISCV_IOMMU_REG_FCTL 0x0008
> +#define RISCV_IOMMU_FCTL_BE BIT(0)
> +#define RISCV_IOMMU_FCTL_WSI BIT(1)
> +#define RISCV_IOMMU_FCTL_GXL BIT(2)
> +
> +/* 5.5 Device-directory-table pointer (64bits) */
> +#define RISCV_IOMMU_REG_DDTP 0x0010
> +#define RISCV_IOMMU_DDTP_MODE GENMASK_ULL(3, 0)
> +#define RISCV_IOMMU_DDTP_BUSY BIT_ULL(4)
> +#define RISCV_IOMMU_DDTP_PPN RISCV_IOMMU_PPN_FIELD
> +
> +/**
> + * enum riscv_iommu_ddtp_modes - I/O MMU translation modes
> + * @RISCV_IOMMU_DDTP_MODE_OFF: No inbound transactions allowed
> + * @RISCV_IOMMU_DDTP_MODE_BARE: Pass-through mode
> + * @RISCV_IOMMU_DDTP_MODE_1LVL: One-level DDT
> + * @RISCV_IOMMU_DDTP_MODE_2LVL: Two-level DDT
> + * @RISCV_IOMMU_DDTP_MODE_3LVL: Three-level DDT
> + */
> +enum riscv_iommu_ddtp_modes {
> + RISCV_IOMMU_DDTP_MODE_OFF = 0,
> + RISCV_IOMMU_DDTP_MODE_BARE = 1,
> + RISCV_IOMMU_DDTP_MODE_1LVL = 2,
> + RISCV_IOMMU_DDTP_MODE_2LVL = 3,
> + RISCV_IOMMU_DDTP_MODE_3LVL = 4,
> + RISCV_IOMMU_DDTP_MODE_MAX = 4
> +};
> +
> +/* 5.6 Command Queue Base (64bits) */
> +#define RISCV_IOMMU_REG_CQB 0x0018
> +#define RISCV_IOMMU_CQB_ENTRIES RISCV_IOMMU_QUEUE_LOGSZ_FIELD
> +#define RISCV_IOMMU_CQB_PPN RISCV_IOMMU_PPN_FIELD
> +
> +/* 5.7 Command Queue head (32bits) */
> +#define RISCV_IOMMU_REG_CQH 0x0020
> +#define RISCV_IOMMU_CQH_INDEX RISCV_IOMMU_QUEUE_INDEX_FIELD
> +
> +/* 5.8 Command Queue tail (32bits) */
> +#define RISCV_IOMMU_REG_CQT 0x0024
> +#define RISCV_IOMMU_CQT_INDEX RISCV_IOMMU_QUEUE_INDEX_FIELD
> +
> +/* 5.9 Fault Queue Base (64bits) */
> +#define RISCV_IOMMU_REG_FQB 0x0028
> +#define RISCV_IOMMU_FQB_ENTRIES RISCV_IOMMU_QUEUE_LOGSZ_FIELD
> +#define RISCV_IOMMU_FQB_PPN RISCV_IOMMU_PPN_FIELD
> +
> +/* 5.10 Fault Queue Head (32bits) */
> +#define RISCV_IOMMU_REG_FQH 0x0030
> +#define RISCV_IOMMU_FQH_INDEX RISCV_IOMMU_QUEUE_INDEX_FIELD
> +
> +/* 5.11 Fault Queue tail (32bits) */
> +#define RISCV_IOMMU_REG_FQT 0x0034
> +#define RISCV_IOMMU_FQT_INDEX RISCV_IOMMU_QUEUE_INDEX_FIELD
> +
> +/* 5.12 Page Request Queue base (64bits) */
> +#define RISCV_IOMMU_REG_PQB 0x0038
> +#define RISCV_IOMMU_PQB_ENTRIES RISCV_IOMMU_QUEUE_LOGSZ_FIELD
> +#define RISCV_IOMMU_PQB_PPN RISCV_IOMMU_PPN_FIELD
> +
> +/* 5.13 Page Request Queue head (32bits) */
> +#define RISCV_IOMMU_REG_PQH 0x0040
> +#define RISCV_IOMMU_PQH_INDEX RISCV_IOMMU_QUEUE_INDEX_FIELD
> +
> +/* 5.14 Page Request Queue tail (32bits) */
> +#define RISCV_IOMMU_REG_PQT 0x0044
> +#define RISCV_IOMMU_PQT_INDEX_MASK RISCV_IOMMU_QUEUE_INDEX_FIELD
> +
> +/* 5.15 Command Queue CSR (32bits) */
> +#define RISCV_IOMMU_REG_CQCSR 0x0048
> +#define RISCV_IOMMU_CQCSR_CQEN RISCV_IOMMU_QUEUE_ENABLE
> +#define RISCV_IOMMU_CQCSR_CIE RISCV_IOMMU_QUEUE_INTR_ENABLE
> +#define RISCV_IOMMU_CQCSR_CQMF RISCV_IOMMU_QUEUE_MEM_FAULT
> +#define RISCV_IOMMU_CQCSR_CMD_TO BIT(9)
> +#define RISCV_IOMMU_CQCSR_CMD_ILL BIT(10)
> +#define RISCV_IOMMU_CQCSR_FENCE_W_IP BIT(11)
> +#define RISCV_IOMMU_CQCSR_CQON RISCV_IOMMU_QUEUE_ACTIVE
> +#define RISCV_IOMMU_CQCSR_BUSY RISCV_IOMMU_QUEUE_BUSY
> +
> +/* 5.16 Fault Queue CSR (32bits) */
> +#define RISCV_IOMMU_REG_FQCSR 0x004C
> +#define RISCV_IOMMU_FQCSR_FQEN RISCV_IOMMU_QUEUE_ENABLE
> +#define RISCV_IOMMU_FQCSR_FIE RISCV_IOMMU_QUEUE_INTR_ENABLE
> +#define RISCV_IOMMU_FQCSR_FQMF RISCV_IOMMU_QUEUE_MEM_FAULT
> +#define RISCV_IOMMU_FQCSR_FQOF RISCV_IOMMU_QUEUE_OVERFLOW
> +#define RISCV_IOMMU_FQCSR_FQON RISCV_IOMMU_QUEUE_ACTIVE
> +#define RISCV_IOMMU_FQCSR_BUSY RISCV_IOMMU_QUEUE_BUSY
> +
> +/* 5.17 Page Request Queue CSR (32bits) */
> +#define RISCV_IOMMU_REG_PQCSR 0x0050
> +#define RISCV_IOMMU_PQCSR_PQEN RISCV_IOMMU_QUEUE_ENABLE
> +#define RISCV_IOMMU_PQCSR_PIE RISCV_IOMMU_QUEUE_INTR_ENABLE
> +#define RISCV_IOMMU_PQCSR_PQMF RISCV_IOMMU_QUEUE_MEM_FAULT
> +#define RISCV_IOMMU_PQCSR_PQOF RISCV_IOMMU_QUEUE_OVERFLOW
> +#define RISCV_IOMMU_PQCSR_PQON RISCV_IOMMU_QUEUE_ACTIVE
> +#define RISCV_IOMMU_PQCSR_BUSY RISCV_IOMMU_QUEUE_BUSY
> +
> +/* 5.18 Interrupt Pending Status (32bits) */
> +#define RISCV_IOMMU_REG_IPSR 0x0054
> +
> +#define RISCV_IOMMU_INTR_CQ 0
> +#define RISCV_IOMMU_INTR_FQ 1
> +#define RISCV_IOMMU_INTR_PM 2
> +#define RISCV_IOMMU_INTR_PQ 3
> +#define RISCV_IOMMU_INTR_COUNT 4
> +
> +#define RISCV_IOMMU_IPSR_CIP BIT(RISCV_IOMMU_INTR_CQ)
> +#define RISCV_IOMMU_IPSR_FIP BIT(RISCV_IOMMU_INTR_FQ)
> +#define RISCV_IOMMU_IPSR_PMIP BIT(RISCV_IOMMU_INTR_PM)
> +#define RISCV_IOMMU_IPSR_PIP BIT(RISCV_IOMMU_INTR_PQ)
> +
> +/* 5.19 Performance monitoring counter overflow status (32bits) */
> +#define RISCV_IOMMU_REG_IOCOUNTOVF 0x0058
> +#define RISCV_IOMMU_IOCOUNTOVF_CY BIT(0)
> +#define RISCV_IOMMU_IOCOUNTOVF_HPM GENMASK_ULL(31, 1)
> +
> +/* 5.20 Performance monitoring counter inhibits (32bits) */
> +#define RISCV_IOMMU_REG_IOCOUNTINH 0x005C
> +#define RISCV_IOMMU_IOCOUNTINH_CY BIT(0)
> +#define RISCV_IOMMU_IOCOUNTINH_HPM GENMASK(31, 1)
> +
> +/* 5.21 Performance monitoring cycles counter (64bits) */
> +#define RISCV_IOMMU_REG_IOHPMCYCLES 0x0060
> +#define RISCV_IOMMU_IOHPMCYCLES_COUNTER GENMASK_ULL(62, 0)
> +#define RISCV_IOMMU_IOHPMCYCLES_OVF BIT_ULL(63)
> +
> +/* 5.22 Performance monitoring event counters (31 * 64bits) */
> +#define RISCV_IOMMU_REG_IOHPMCTR_BASE 0x0068
> +#define RISCV_IOMMU_REG_IOHPMCTR(_n) (RISCV_IOMMU_REG_IOHPMCTR_BASE + (_n * 0x8))
> +
> +/* 5.23 Performance monitoring event selectors (31 * 64bits) */
> +#define RISCV_IOMMU_REG_IOHPMEVT_BASE 0x0160
> +#define RISCV_IOMMU_REG_IOHPMEVT(_n) (RISCV_IOMMU_REG_IOHPMEVT_BASE + (_n * 0x8))
> +#define RISCV_IOMMU_IOHPMEVT_EVENT_ID GENMASK_ULL(14, 0)
> +#define RISCV_IOMMU_IOHPMEVT_DMASK BIT_ULL(15)
> +#define RISCV_IOMMU_IOHPMEVT_PID_PSCID GENMASK_ULL(35, 16)
> +#define RISCV_IOMMU_IOHPMEVT_DID_GSCID GENMASK_ULL(59, 36)
> +#define RISCV_IOMMU_IOHPMEVT_PV_PSCV BIT_ULL(60)
> +#define RISCV_IOMMU_IOHPMEVT_DV_GSCV BIT_ULL(61)
> +#define RISCV_IOMMU_IOHPMEVT_IDT BIT_ULL(62)
> +#define RISCV_IOMMU_IOHPMEVT_OF BIT_ULL(63)
> +
> +/**
> + * enum riscv_iommu_hpmevent_id - Performance-monitoring event identifier
> + *
> + * @RISCV_IOMMU_HPMEVENT_INVALID: Invalid event, do not count
> + * @RISCV_IOMMU_HPMEVENT_URQ: Untranslated requests
> + * @RISCV_IOMMU_HPMEVENT_TRQ: Translated requests
> + * @RISCV_IOMMU_HPMEVENT_ATS_RQ: ATS translation requests
> + * @RISCV_IOMMU_HPMEVENT_TLB_MISS: TLB misses
> + * @RISCV_IOMMU_HPMEVENT_DD_WALK: Device directory walks
> + * @RISCV_IOMMU_HPMEVENT_PD_WALK: Process directory walks
> + * @RISCV_IOMMU_HPMEVENT_S_VS_WALKS: S/VS-Stage page table walks
> + * @RISCV_IOMMU_HPMEVENT_G_WALKS: G-Stage page table walks
> + * @RISCV_IOMMU_HPMEVENT_MAX: Value to denote maximum Event IDs
> + */
> +enum riscv_iommu_hpmevent_id {
> + RISCV_IOMMU_HPMEVENT_INVALID = 0,
> + RISCV_IOMMU_HPMEVENT_URQ = 1,
> + RISCV_IOMMU_HPMEVENT_TRQ = 2,
> + RISCV_IOMMU_HPMEVENT_ATS_RQ = 3,
> + RISCV_IOMMU_HPMEVENT_TLB_MISS = 4,
> + RISCV_IOMMU_HPMEVENT_DD_WALK = 5,
> + RISCV_IOMMU_HPMEVENT_PD_WALK = 6,
> + RISCV_IOMMU_HPMEVENT_S_VS_WALKS = 7,
> + RISCV_IOMMU_HPMEVENT_G_WALKS = 8,
> + RISCV_IOMMU_HPMEVENT_MAX = 9
> +};
> +
> +/* 5.24 Translation request IOVA (64bits) */
> +#define RISCV_IOMMU_REG_TR_REQ_IOVA 0x0258
> +#define RISCV_IOMMU_TR_REQ_IOVA_VPN GENMASK_ULL(63, 12)
> +
> +/* 5.25 Translation request control (64bits) */
> +#define RISCV_IOMMU_REG_TR_REQ_CTL 0x0260
> +#define RISCV_IOMMU_TR_REQ_CTL_GO_BUSY BIT_ULL(0)
> +#define RISCV_IOMMU_TR_REQ_CTL_PRIV BIT_ULL(1)
> +#define RISCV_IOMMU_TR_REQ_CTL_EXE BIT_ULL(2)
> +#define RISCV_IOMMU_TR_REQ_CTL_NW BIT_ULL(3)
> +#define RISCV_IOMMU_TR_REQ_CTL_PID GENMASK_ULL(31, 12)
> +#define RISCV_IOMMU_TR_REQ_CTL_PV BIT_ULL(32)
> +#define RISCV_IOMMU_TR_REQ_CTL_DID GENMASK_ULL(63, 40)
> +
> +/* 5.26 Translation request response (64bits) */
> +#define RISCV_IOMMU_REG_TR_RESPONSE 0x0268
> +#define RISCV_IOMMU_TR_RESPONSE_FAULT BIT_ULL(0)
> +#define RISCV_IOMMU_TR_RESPONSE_PBMT GENMASK_ULL(8, 7)
> +#define RISCV_IOMMU_TR_RESPONSE_SZ BIT_ULL(9)
> +#define RISCV_IOMMU_TR_RESPONSE_PPN RISCV_IOMMU_PPN_FIELD
> +
> +/* 5.27 Interrupt cause to vector (64bits) */
> +#define RISCV_IOMMU_REG_IVEC 0x02F8
> +#define RISCV_IOMMU_IVEC_CIV GENMASK_ULL(3, 0)
> +#define RISCV_IOMMU_IVEC_FIV GENMASK_ULL(7, 4)
> +#define RISCV_IOMMU_IVEC_PMIV GENMASK_ULL(11, 8)
> +#define RISCV_IOMMU_IVEC_PIV GENMASK_ULL(15,12)
> +
> +/* 5.28 MSI Configuration table (32 * 64bits) */
> +#define RISCV_IOMMU_REG_MSI_CONFIG 0x0300
> +#define RISCV_IOMMU_REG_MSI_ADDR(_n) (RISCV_IOMMU_REG_MSI_CONFIG + (_n * 0x10))
> +#define RISCV_IOMMU_MSI_ADDR GENMASK_ULL(55, 2)
> +#define RISCV_IOMMU_REG_MSI_DATA(_n) (RISCV_IOMMU_REG_MSI_CONFIG + (_n * 0x10) + 0x08)
> +#define RISCV_IOMMU_MSI_DATA GENMASK_ULL(31, 0)
> +#define RISCV_IOMMU_REG_MSI_VEC_CTL(_n) (RISCV_IOMMU_REG_MSI_CONFIG + (_n * 0x10) + 0x0C)
> +#define RISCV_IOMMU_MSI_VEC_CTL_M BIT_ULL(0)
> +
> +#define RISCV_IOMMU_REG_SIZE 0x1000
> +
> +/*
> + * Chapter 2: Data structures
> + */
> +
> +/*
> + * Device Directory Table macros for non-leaf nodes
> + */
> +#define RISCV_IOMMU_DDTE_VALID BIT_ULL(0)
> +#define RISCV_IOMMU_DDTE_PPN RISCV_IOMMU_PPN_FIELD
> +
> +/**
> + * struct riscv_iommu_dc - Device Context
> + * @tc: Translation Control
> + * @iohgatp: I/O Hypervisor guest address translation and protection
> + * (Second stage context)
> + * @ta: Translation Attributes
> + * @fsc: First stage context
> + * @msiptpt: MSI page table pointer
> + * @msi_addr_mask: MSI address mask
> + * @msi_addr_pattern: MSI address pattern
> + *
> + * This structure is used for leaf nodes on the Device Directory Table,
> + * in case RISCV_IOMMU_CAP_MSI_FLAT is not set, the bottom 4 fields are
> + * not present and are skipped with pointer arithmetic to avoid
> + * casting, check out riscv_iommu_get_dc().
> + * See section 2.1 for more details
> + */
> +struct riscv_iommu_dc {
> + u64 tc;
> + u64 iohgatp;
> + u64 ta;
> + u64 fsc;
> + u64 msiptp;
> + u64 msi_addr_mask;
> + u64 msi_addr_pattern;
> + u64 _reserved;
> +};
> +
> +/* Translation control fields */
> +#define RISCV_IOMMU_DC_TC_V BIT_ULL(0)
> +#define RISCV_IOMMU_DC_TC_EN_ATS BIT_ULL(1)
> +#define RISCV_IOMMU_DC_TC_EN_PRI BIT_ULL(2)
> +#define RISCV_IOMMU_DC_TC_T2GPA BIT_ULL(3)
> +#define RISCV_IOMMU_DC_TC_DTF BIT_ULL(4)
> +#define RISCV_IOMMU_DC_TC_PDTV BIT_ULL(5)
> +#define RISCV_IOMMU_DC_TC_PRPR BIT_ULL(6)
> +#define RISCV_IOMMU_DC_TC_GADE BIT_ULL(7)
> +#define RISCV_IOMMU_DC_TC_SADE BIT_ULL(8)
> +#define RISCV_IOMMU_DC_TC_DPE BIT_ULL(9)
> +#define RISCV_IOMMU_DC_TC_SBE BIT_ULL(10)
> +#define RISCV_IOMMU_DC_TC_SXL BIT_ULL(11)
> +
> +/* Second-stage (aka G-stage) context fields */
> +#define RISCV_IOMMU_DC_IOHGATP_PPN RISCV_IOMMU_ATP_PPN_FIELD
> +#define RISCV_IOMMU_DC_IOHGATP_GSCID GENMASK_ULL(59, 44)
> +#define RISCV_IOMMU_DC_IOHGATP_MODE RISCV_IOMMU_ATP_MODE_FIELD
> +
> +/**
> + * enum riscv_iommu_dc_iohgatp_modes - Guest address translation/protection modes
> + * @RISCV_IOMMU_DC_IOHGATP_MODE_BARE: No translation/protection
> + * @RISCV_IOMMU_DC_IOHGATP_MODE_SV32X4: Sv32x4 (2-bit extension of Sv32), when fctl.GXL == 1
> + * @RISCV_IOMMU_DC_IOHGATP_MODE_SV39X4: Sv39x4 (2-bit extension of Sv39), when fctl.GXL == 0
> + * @RISCV_IOMMU_DC_IOHGATP_MODE_SV48X4: Sv48x4 (2-bit extension of Sv48), when fctl.GXL == 0
> + * @RISCV_IOMMU_DC_IOHGATP_MODE_SV57X4: Sv57x4 (2-bit extension of Sv57), when fctl.GXL == 0
> + */
> +enum riscv_iommu_dc_iohgatp_modes {
> + RISCV_IOMMU_DC_IOHGATP_MODE_BARE = 0,
> + RISCV_IOMMU_DC_IOHGATP_MODE_SV32X4 = 8,
> + RISCV_IOMMU_DC_IOHGATP_MODE_SV39X4 = 8,
> + RISCV_IOMMU_DC_IOHGATP_MODE_SV48X4 = 9,
> + RISCV_IOMMU_DC_IOHGATP_MODE_SV57X4 = 10
> +};
> +
> +/* Translation attributes fields */
> +#define RISCV_IOMMU_DC_TA_PSCID GENMASK_ULL(31,12)
> +
> +/* First-stage context fields */
> +#define RISCV_IOMMU_DC_FSC_PPN RISCV_IOMMU_ATP_PPN_FIELD
> +#define RISCV_IOMMU_DC_FSC_MODE RISCV_IOMMU_ATP_MODE_FIELD
> +
> +/**
> + * enum riscv_iommu_dc_fsc_atp_modes - First stage address translation/protection modes
> + * @RISCV_IOMMU_DC_FSC_MODE_BARE: No translation/protection
> + * @RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV32: Sv32, when dc.tc.SXL == 1
> + * @RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV39: Sv39, when dc.tc.SXL == 0
> + * @RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV48: Sv48, when dc.tc.SXL == 0
> + * @RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV57: Sv57, when dc.tc.SXL == 0
> + * @RISCV_IOMMU_DC_FSC_PDTP_MODE_PD8: 1lvl PDT, 8bit process ids
> + * @RISCV_IOMMU_DC_FSC_PDTP_MODE_PD17: 2lvl PDT, 17bit process ids
> + * @RISCV_IOMMU_DC_FSC_PDTP_MODE_PD20: 3lvl PDT, 20bit process ids
> + *
> + * FSC holds IOSATP when RISCV_IOMMU_DC_TC_PDTV is 0 and PDTP otherwise.
> + * IOSATP controls the first stage address translation (same as the satp register on
> + * the RISC-V MMU), and PDTP holds the process directory table, used to select a
> + * first stage page table based on a process id (for devices that support multiple
> + * process ids).
> + */
> +enum riscv_iommu_dc_fsc_atp_modes {
> + RISCV_IOMMU_DC_FSC_MODE_BARE = 0,
> + RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV32 = 8,
> + RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV39 = 8,
> + RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV48 = 9,
> + RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV57 = 10,
> + RISCV_IOMMU_DC_FSC_PDTP_MODE_PD8 = 1,
> + RISCV_IOMMU_DC_FSC_PDTP_MODE_PD17 = 2,
> + RISCV_IOMMU_DC_FSC_PDTP_MODE_PD20 = 3
> +};
> +
> +/* MSI page table pointer */
> +#define RISCV_IOMMU_DC_MSIPTP_PPN RISCV_IOMMU_ATP_PPN_FIELD
> +#define RISCV_IOMMU_DC_MSIPTP_MODE RISCV_IOMMU_ATP_MODE_FIELD
> +#define RISCV_IOMMU_DC_MSIPTP_MODE_OFF 0
> +#define RISCV_IOMMU_DC_MSIPTP_MODE_FLAT 1
> +
> +/* MSI address mask */
> +#define RISCV_IOMMU_DC_MSI_ADDR_MASK GENMASK_ULL(51, 0)
> +
> +/* MSI address pattern */
> +#define RISCV_IOMMU_DC_MSI_PATTERN GENMASK_ULL(51, 0)
> +
> +/**
> + * struct riscv_iommu_pc - Process Context
> + * @ta: Translation Attributes
> + * @fsc: First stage context
> + *
> + * This structure is used for leaf nodes on the Process Directory Table
> + * See section 2.3 for more details
> + */
> +struct riscv_iommu_pc {
> + u64 ta;
> + u64 fsc;
> +};
> +
> +/* Translation attributes fields */
> +#define RISCV_IOMMU_PC_TA_V BIT_ULL(0)
> +#define RISCV_IOMMU_PC_TA_ENS BIT_ULL(1)
> +#define RISCV_IOMMU_PC_TA_SUM BIT_ULL(2)
> +#define RISCV_IOMMU_PC_TA_PSCID GENMASK_ULL(31, 12)
> +
> +/* First stage context fields */
> +#define RISCV_IOMMU_PC_FSC_PPN RISCV_IOMMU_ATP_PPN_FIELD
> +#define RISCV_IOMMU_PC_FSC_MODE RISCV_IOMMU_ATP_MODE_FIELD
> +
> +/*
> + * Chapter 3: In-memory queue interface
> + */
> +
> +/**
> + * struct riscv_iommu_cmd - Generic I/O MMU command structure
> + * @dword0: Includes the opcode and the function identifier
> + * @dword1: Opcode specific data
> + *
> + * The commands are interpreted as two 64bit fields, where the first
> + * 7bits of the first field are the opcode which also defines the
> + * command's format, followed by a 3bit field that specifies the
> + * function invoked by that command, and the rest is opcode-specific.
> + * This is a generic struct which will be populated differently
> + * according to each command. For more infos on the commands and
> + * the command queue check section 3.1.
> + */
> +struct riscv_iommu_command {
> + u64 dword0;
> + u64 dword1;
> +};
> +
> +/* Fields on dword0, common for all commands */
> +#define RISCV_IOMMU_CMD_OPCODE GENMASK_ULL(6, 0)
> +#define RISCV_IOMMU_CMD_FUNC GENMASK_ULL(9, 7)
> +
> +/* 3.1.1 I/O MMU Page-table cache invalidation */
> +/* Fields on dword0 */
> +#define RISCV_IOMMU_CMD_IOTINVAL_OPCODE 1
> +#define RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA 0
> +#define RISCV_IOMMU_CMD_IOTINVAL_FUNC_GVMA 1
> +#define RISCV_IOMMU_CMD_IOTINVAL_AV BIT_ULL(10)
> +#define RISCV_IOMMU_CMD_IOTINVAL_PSCID GENMASK_ULL(31, 12)
> +#define RISCV_IOMMU_CMD_IOTINVAL_PSCV BIT_ULL(32)
> +#define RISCV_IOMMU_CMD_IOTINVAL_GV BIT_ULL(33)
> +#define RISCV_IOMMU_CMD_IOTINVAL_GSCID GENMASK_ULL(59, 44)
> +/* dword1 is the address, 4K-alligned and shifted to the right by
> + * two bits. */
> +
> +/* 3.1.2 I/O MMU Command Queue Fences */
> +/* Fields on dword0 */
> +#define RISCV_IOMMU_CMD_IOFENCE_OPCODE 2
> +#define RISCV_IOMMU_CMD_IOFENCE_FUNC_C 0
> +#define RISCV_IOMMU_CMD_IOFENCE_AV BIT_ULL(10)
> +#define RISCV_IOMMU_CMD_IOFENCE_WSI BIT_ULL(11)
> +#define RISCV_IOMMU_CMD_IOFENCE_PR BIT_ULL(12)
> +#define RISCV_IOMMU_CMD_IOFENCE_PW BIT_ULL(13)
> +#define RISCV_IOMMU_CMD_IOFENCE_DATA GENMASK_ULL(63, 32)
> +/* dword1 is the address, word-size alligned and shifted to the
> + * right by two bits. */
> +
> +/* 3.1.3 I/O MMU Directory cache invalidation */
> +/* Fields on dword0 */
> +#define RISCV_IOMMU_CMD_IODIR_OPCODE 3
> +#define RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT 0
> +#define RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_PDT 1
> +#define RISCV_IOMMU_CMD_IODIR_PID GENMASK_ULL(31, 12)
> +#define RISCV_IOMMU_CMD_IODIR_DV BIT_ULL(33)
> +#define RISCV_IOMMU_CMD_IODIR_DID GENMASK_ULL(63, 40)
> +/* dword1 is reserved for standard use */
> +
> +/* 3.1.4 I/O MMU PCIe ATS */
> +/* Fields on dword0 */
> +#define RISCV_IOMMU_CMD_ATS_OPCODE 4
> +#define RISCV_IOMMU_CMD_ATS_FUNC_INVAL 0
> +#define RISCV_IOMMU_CMD_ATS_FUNC_PRGR 1
> +#define RISCV_IOMMU_CMD_ATS_PID GENMASK_ULL(31, 12)
> +#define RISCV_IOMMU_CMD_ATS_PV BIT_ULL(32)
> +#define RISCV_IOMMU_CMD_ATS_DSV BIT_ULL(33)
> +#define RISCV_IOMMU_CMD_ATS_RID GENMASK_ULL(55, 40)
> +#define RISCV_IOMMU_CMD_ATS_DSEG GENMASK_ULL(63, 56)
> +/* dword1 is the ATS payload, two different payload types for INVAL and PRGR */
> +
> +/* ATS.INVAL payload*/
> +#define RISCV_IOMMU_CMD_ATS_INVAL_G BIT_ULL(0)
> +/* Bits 1 - 10 are zeroed */
> +#define RISCV_IOMMU_CMD_ATS_INVAL_S BIT_ULL(11)
> +#define RISCV_IOMMU_CMD_ATS_INVAL_UADDR GENMASK_ULL(63, 12)
> +
> +/* ATS.PRGR payload */
> +/* Bits 0 - 31 are zeroed */
> +#define RISCV_IOMMU_CMD_ATS_PRGR_PRG_INDEX GENMASK_ULL(40, 32)
> +/* Bits 41 - 43 are zeroed */
> +#define RISCV_IOMMU_CMD_ATS_PRGR_RESP_CODE GENMASK_ULL(47, 44)
> +#define RISCV_IOMMU_CMD_ATS_PRGR_DST_ID GENMASK_ULL(63, 48)
> +
> +/**
> + * struct riscv_iommu_fq_record - Fault/Event Queue Record
> + * @hdr: Header, includes fault/event cause, PID/DID, transaction type etc
> + * @_reserved: Low 32bits for custom use, high 32bits for standard use
> + * @iotval: Transaction-type/cause specific format
> + * @iotval2: Cause specific format
> + *
> + * The fault/event queue reports events and failures raised when
> + * processing transactions. Each record is a 32byte structure where
> + * the first dword has a fixed format for providing generic infos
> + * regarding the fault/event, and two more dwords are there for
> + * fault/event-specific information. For more details see section
> + * 3.2.
> + */
> +struct riscv_iommu_fq_record {
> + u64 hdr;
> + u64 _reserved;
> + u64 iotval;
> + u64 iotval2;
> +};
> +
> +/* Fields on header */
> +#define RISCV_IOMMU_FQ_HDR_CAUSE GENMASK_ULL(11, 0)
> +#define RISCV_IOMMU_FQ_HDR_PID GENMASK_ULL(31, 12)
> +#define RISCV_IOMMU_FQ_HDR_PV BIT_ULL(32)
> +#define RISCV_IOMMU_FQ_HDR_PRIV BIT_ULL(33)
> +#define RISCV_IOMMU_FQ_HDR_TTYPE GENMASK_ULL(39, 34)
> +#define RISCV_IOMMU_FQ_HDR_DID GENMASK_ULL(63, 40)
> +
> +/**
> + * enum riscv_iommu_fq_causes - Fault/event cause values
> + * @RISCV_IOMMU_FQ_CAUSE_INST_FAULT: Instruction access fault
> + * @RISCV_IOMMU_FQ_CAUSE_RD_ADDR_MISALIGNED: Read address misaligned
> + * @RISCV_IOMMU_FQ_CAUSE_RD_FAULT: Read load fault
> + * @RISCV_IOMMU_FQ_CAUSE_WR_ADDR_MISALIGNED: Write/AMO address misaligned
> + * @RISCV_IOMMU_FQ_CAUSE_WR_FAULT: Write/AMO access fault
> + * @RISCV_IOMMU_FQ_CAUSE_INST_FAULT_S: Instruction page fault
> + * @RISCV_IOMMU_FQ_CAUSE_RD_FAULT_S: Read page fault
> + * @RISCV_IOMMU_FQ_CAUSE_WR_FAULT_S: Write/AMO page fault
> + * @RISCV_IOMMU_FQ_CAUSE_INST_FAULT_VS: Instruction guest page fault
> + * @RISCV_IOMMU_FQ_CAUSE_RD_FAULT_VS: Read guest page fault
> + * @RISCV_IOMMU_FQ_CAUSE_WR_FAULT_VS: Write/AMO guest page fault
> + * @RISCV_IOMMU_FQ_CAUSE_DMA_DISABLED: All inbound transactions disallowed
> + * @RISCV_IOMMU_FQ_CAUSE_DDT_LOAD_FAULT: DDT entry load access fault
> + * @RISCV_IOMMU_FQ_CAUSE_DDT_INVALID: DDT entry invalid
> + * @RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED: DDT entry misconfigured
> + * @RISCV_IOMMU_FQ_CAUSE_TTYPE_BLOCKED: Transaction type disallowed
> + * @RISCV_IOMMU_FQ_CAUSE_MSI_LOAD_FAULT: MSI PTE load access fault
> + * @RISCV_IOMMU_FQ_CAUSE_MSI_INVALID: MSI PTE invalid
> + * @RISCV_IOMMU_FQ_CAUSE_MSI_MISCONFIGURED: MSI PTE misconfigured
> + * @RISCV_IOMMU_FQ_CAUSE_MRIF_FAULT: MRIF access fault
> + * @RISCV_IOMMU_FQ_CAUSE_PDT_LOAD_FAULT: PDT entry load access fault
> + * @RISCV_IOMMU_FQ_CAUSE_PDT_INVALID: PDT entry invalid
> + * @RISCV_IOMMU_FQ_CAUSE_PDT_MISCONFIGURED: PDT entry misconfigured
> + * @RISCV_IOMMU_FQ_CAUSE_DDT_CORRUPTED: DDT data corruption
> + * @RISCV_IOMMU_FQ_CAUSE_PDT_CORRUPTED: PDT data corruption
> + * @RISCV_IOMMU_FQ_CAUSE_MSI_PT_CORRUPTED: MSI page table data corruption
> + * @RISCV_IOMMU_FQ_CAUSE_MRIF_CORRUIPTED: MRIF data corruption
> + * @RISCV_IOMMU_FQ_CAUSE_INTERNAL_DP_ERROR: Internal data path error
> + * @RISCV_IOMMU_FQ_CAUSE_MSI_WR_FAULT: IOMMU MSI write access fault
> + * @RISCV_IOMMU_FQ_CAUSE_PT_CORRUPTED: First/second stage page table data corruption
> + *
> + * Values are on table 11 of the spec, encodings 275 - 2047 are reserved for standard
> + * use, and 2048 - 4095 for custom use.
> + */
> +enum riscv_iommu_fq_causes {
> + RISCV_IOMMU_FQ_CAUSE_INST_FAULT = 1,
> + RISCV_IOMMU_FQ_CAUSE_RD_ADDR_MISALIGNED = 4,
> + RISCV_IOMMU_FQ_CAUSE_RD_FAULT = 5,
> + RISCV_IOMMU_FQ_CAUSE_WR_ADDR_MISALIGNED = 6,
> + RISCV_IOMMU_FQ_CAUSE_WR_FAULT = 7,
> + RISCV_IOMMU_FQ_CAUSE_INST_FAULT_S = 12,
> + RISCV_IOMMU_FQ_CAUSE_RD_FAULT_S = 13,
> + RISCV_IOMMU_FQ_CAUSE_WR_FAULT_S = 15,
> + RISCV_IOMMU_FQ_CAUSE_INST_FAULT_VS = 20,
> + RISCV_IOMMU_FQ_CAUSE_RD_FAULT_VS = 21,
> + RISCV_IOMMU_FQ_CAUSE_WR_FAULT_VS = 23,
> + RISCV_IOMMU_FQ_CAUSE_DMA_DISABLED = 256,
> + RISCV_IOMMU_FQ_CAUSE_DDT_LOAD_FAULT = 257,
> + RISCV_IOMMU_FQ_CAUSE_DDT_INVALID = 258,
> + RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED = 259,
> + RISCV_IOMMU_FQ_CAUSE_TTYPE_BLOCKED = 260,
> + RISCV_IOMMU_FQ_CAUSE_MSI_LOAD_FAULT = 261,
> + RISCV_IOMMU_FQ_CAUSE_MSI_INVALID = 262,
> + RISCV_IOMMU_FQ_CAUSE_MSI_MISCONFIGURED = 263,
> + RISCV_IOMMU_FQ_CAUSE_MRIF_FAULT = 264,
> + RISCV_IOMMU_FQ_CAUSE_PDT_LOAD_FAULT = 265,
> + RISCV_IOMMU_FQ_CAUSE_PDT_INVALID = 266,
> + RISCV_IOMMU_FQ_CAUSE_PDT_MISCONFIGURED = 267,
> + RISCV_IOMMU_FQ_CAUSE_DDT_CORRUPTED = 268,
> + RISCV_IOMMU_FQ_CAUSE_PDT_CORRUPTED = 269,
> + RISCV_IOMMU_FQ_CAUSE_MSI_PT_CORRUPTED = 270,
> + RISCV_IOMMU_FQ_CAUSE_MRIF_CORRUIPTED = 271,
> + RISCV_IOMMU_FQ_CAUSE_INTERNAL_DP_ERROR = 272,
> + RISCV_IOMMU_FQ_CAUSE_MSI_WR_FAULT = 273,
> + RISCV_IOMMU_FQ_CAUSE_PT_CORRUPTED = 274
> +};
> +
> +/**
> + * enum riscv_iommu_fq_ttypes: Fault/event transaction types
> + * @RISCV_IOMMU_FQ_TTYPE_NONE: None. Fault not caused by an inbound transaction.
> + * @RISCV_IOMMU_FQ_TTYPE_UADDR_INST_FETCH: Instruction fetch from untranslated address
> + * @RISCV_IOMMU_FQ_TTYPE_UADDR_RD: Read from untranslated address
> + * @RISCV_IOMMU_FQ_TTYPE_UADDR_WR: Write/AMO to untranslated address
> + * @RISCV_IOMMU_FQ_TTYPE_TADDR_INST_FETCH: Instruction fetch from translated address
> + * @RISCV_IOMMU_FQ_TTYPE_TADDR_RD: Read from translated address
> + * @RISCV_IOMMU_FQ_TTYPE_TADDR_WR: Write/AMO to translated address
> + * @RISCV_IOMMU_FQ_TTYPE_PCIE_ATS_REQ: PCIe ATS translation request
> + * @RISCV_IOMMU_FW_TTYPE_PCIE_MSG_REQ: PCIe message request
> + *
> + * Values are on table 12 of the spec, type 4 and 10 - 31 are reserved for standard use
> + * and 31 - 63 for custom use.
> + */
> +enum riscv_iommu_fq_ttypes {
> + RISCV_IOMMU_FQ_TTYPE_NONE = 0,
> + RISCV_IOMMU_FQ_TTYPE_UADDR_INST_FETCH = 1,
> + RISCV_IOMMU_FQ_TTYPE_UADDR_RD = 2,
> + RISCV_IOMMU_FQ_TTYPE_UADDR_WR = 3,
> + RISCV_IOMMU_FQ_TTYPE_TADDR_INST_FETCH = 5,
> + RISCV_IOMMU_FQ_TTYPE_TADDR_RD = 6,
> + RISCV_IOMMU_FQ_TTYPE_TADDR_WR = 7,
> + RISCV_IOMMU_FQ_TTYPE_PCIE_ATS_REQ = 8,
> + RISCV_IOMMU_FW_TTYPE_PCIE_MSG_REQ = 9,
> +};
> +
> +/**
> + * struct riscv_iommu_pq_record - PCIe Page Request record
> + * @hdr: Header, includes PID, DID etc
> + * @payload: Holds the page address, request group and permission bits
> + *
> + * For more infos on the PCIe Page Request queue see chapter 3.3.
> + */
> +struct riscv_iommu_pq_record {
> + u64 hdr;
> + u64 payload;
> +};
> +
> +/* Header fields */
> +#define RISCV_IOMMU_PREQ_HDR_PID GENMASK_ULL(31, 12)
> +#define RISCV_IOMMU_PREQ_HDR_PV BIT_ULL(32)
> +#define RISCV_IOMMU_PREQ_HDR_PRIV BIT_ULL(33)
> +#define RISCV_IOMMU_PREQ_HDR_EXEC BIT_ULL(34)
> +#define RISCV_IOMMU_PREQ_HDR_DID GENMASK_ULL(63, 40)
> +
> +/* Payload fields */
> +#define RISCV_IOMMU_PREQ_PAYLOAD_R BIT_ULL(0)
> +#define RISCV_IOMMU_PREQ_PAYLOAD_W BIT_ULL(1)
> +#define RISCV_IOMMU_PREQ_PAYLOAD_L BIT_ULL(2)
> +#define RISCV_IOMMU_PREQ_PAYLOAD_M GENMASK_ULL(2, 0) /* Mask of RWL for convenience */
> +#define RISCV_IOMMU_PREQ_PRG_INDEX GENMASK_ULL(11, 3)
> +#define RISCV_IOMMU_PREQ_UADDR GENMASK_ULL(63, 12)
> +
> +/**
> + * struct riscv_iommu_msi_pte - MSI Page Table Entry
> + * @pte: MSI PTE
> + * @mrif_info: Memory-resident interrupt file info
> + *
> + * The MSI Page Table is used for virtualizing MSIs, so that when
> + * a device sends an MSI to a guest, the IOMMU can reroute it
> + * by translating the MSI address, either to a guest interrupt file
> + * or a memory resident interrupt file (MRIF). Note that this page table
> + * is an array of MSI PTEs, not a multi-level pt, each entry
> + * is a leaf entry. For more infos check out the the AIA spec, chapter 9.5.
> + *
> + * Also in basic mode the mrif_info field is ignored by the IOMMU and can
> + * be used by software, any other reserved fields on pte must be zeroed-out
> + * by software.
> + */
> +struct riscv_iommu_msi_pte {
> + u64 pte;
> + u64 mrif_info;
> +};
> +
> +/* Fields on pte */
> +#define RISCV_IOMMU_MSI_PTE_V BIT_ULL(0)
> +#define RISCV_IOMMU_MSI_PTE_M GENMASK_ULL(2, 1)
> +#define RISCV_IOMMU_MSI_PTE_MRIF_ADDR GENMASK_ULL(53, 7) /* When M == 1 (MRIF mode) */
> +#define RISCV_IOMMU_MSI_PTE_PPN RISCV_IOMMU_PPN_FIELD /* When M == 3 (basic mode) */
> +#define RISCV_IOMMU_MSI_PTE_C BIT_ULL(63)
> +
> +/* Fields on mrif_info */
> +#define RISCV_IOMMU_MSI_MRIF_NID GENMASK_ULL(9, 0)
> +#define RISCV_IOMMU_MSI_MRIF_NPPN RISCV_IOMMU_PPN_FIELD
> +#define RISCV_IOMMU_MSI_MRIF_NID_MSB BIT_ULL(60)
> +
> +#endif /* _RISCV_IOMMU_BITS_H_ */
> diff --git a/drivers/iommu/riscv/iommu-pci.c b/drivers/iommu/riscv/iommu-pci.c
> new file mode 100644
> index 000000000000..c91f963d7a29
> --- /dev/null
> +++ b/drivers/iommu/riscv/iommu-pci.c
> @@ -0,0 +1,134 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +/*
> + * Copyright © 2022-2023 Rivos Inc.
> + * Copyright © 2023 FORTH-ICS/CARV
> + *
> + * RISCV IOMMU as a PCIe device
> + *
> + * Authors
> + * Tomasz Jeznach <tjeznach@xxxxxxxxxxxx>
> + * Nick Kossifidis <mick@xxxxxxxxxxxx>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/compiler.h>
> +#include <linux/pci.h>
> +#include <linux/init.h>
> +#include <linux/iommu.h>
> +#include <linux/bitfield.h>
> +
> +#include "iommu.h"
> +
> +/* Rivos Inc. assigned PCI Vendor and Device IDs */
> +#ifndef PCI_VENDOR_ID_RIVOS
> +#define PCI_VENDOR_ID_RIVOS 0x1efd
> +#endif
> +
> +#ifndef PCI_DEVICE_ID_RIVOS_IOMMU
> +#define PCI_DEVICE_ID_RIVOS_IOMMU 0xedf1
> +#endif
> +
> +static int riscv_iommu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> +{
> + struct device *dev = &pdev->dev;
> + struct riscv_iommu_device *iommu;
> + int ret;
> +
> + ret = pci_enable_device_mem(pdev);
> + if (ret < 0)
> + return ret;
> +
> + ret = pci_request_mem_regions(pdev, KBUILD_MODNAME);
> + if (ret < 0)
> + goto fail;
> +
> + ret = -ENOMEM;
> +
> + iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
> + if (!iommu)
> + goto fail;
> +
> + if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM))
> + goto fail;
> +
> + if (pci_resource_len(pdev, 0) < RISCV_IOMMU_REG_SIZE)
> + goto fail;
> +
> + iommu->reg_phys = pci_resource_start(pdev, 0);
> + if (!iommu->reg_phys)
> + goto fail;
> +
> + iommu->reg = devm_ioremap(dev, iommu->reg_phys, RISCV_IOMMU_REG_SIZE);
> + if (!iommu->reg)
> + goto fail;
> +
> + iommu->dev = dev;
> + dev_set_drvdata(dev, iommu);
> +
> + dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> + pci_set_master(pdev);
> +
> + ret = riscv_iommu_init(iommu);
> + if (!ret)
> + return ret;
> +
> + fail:
> + pci_clear_master(pdev);
> + pci_release_regions(pdev);
> + pci_disable_device(pdev);
> + /* Note: devres_release_all() will release iommu and iommu->reg */
> + return ret;
> +}
> +
> +static void riscv_iommu_pci_remove(struct pci_dev *pdev)
> +{
> + riscv_iommu_remove(dev_get_drvdata(&pdev->dev));
> + pci_clear_master(pdev);
> + pci_release_regions(pdev);
> + pci_disable_device(pdev);
> +}
> +
> +static int riscv_iommu_suspend(struct device *dev)
> +{
> + dev_warn(dev, "RISC-V IOMMU PM not implemented");
> + return -ENODEV;
> +}
> +
> +static int riscv_iommu_resume(struct device *dev)
> +{
> + dev_warn(dev, "RISC-V IOMMU PM not implemented");
> + return -ENODEV;
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(riscv_iommu_pm_ops, riscv_iommu_suspend,
> + riscv_iommu_resume);
> +
> +static const struct pci_device_id riscv_iommu_pci_tbl[] = {
> + {PCI_VENDOR_ID_RIVOS, PCI_DEVICE_ID_RIVOS_IOMMU,
> + PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
> + {0,}
> +};
> +
> +MODULE_DEVICE_TABLE(pci, riscv_iommu_pci_tbl);
> +
> +static const struct of_device_id riscv_iommu_of_match[] = {
> + {.compatible = "riscv,pci-iommu",},
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, riscv_iommu_of_match);
> +
> +static struct pci_driver riscv_iommu_pci_driver = {
> + .name = KBUILD_MODNAME,
> + .id_table = riscv_iommu_pci_tbl,
> + .probe = riscv_iommu_pci_probe,
> + .remove = riscv_iommu_pci_remove,
> + .driver = {
> + .pm = pm_sleep_ptr(&riscv_iommu_pm_ops),
> + .of_match_table = riscv_iommu_of_match,
> + },
> +};
> +
> +module_driver(riscv_iommu_pci_driver, pci_register_driver, pci_unregister_driver);
> diff --git a/drivers/iommu/riscv/iommu-platform.c b/drivers/iommu/riscv/iommu-platform.c
> new file mode 100644
> index 000000000000..e4e8ca6711e7
> --- /dev/null
> +++ b/drivers/iommu/riscv/iommu-platform.c
> @@ -0,0 +1,94 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * RISC-V IOMMU as a platform device
> + *
> + * Copyright © 2023 FORTH-ICS/CARV
> + *
> + * Author: Nick Kossifidis <mick@xxxxxxxxxxxx>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/of_platform.h>
> +#include <linux/bitfield.h>
> +
> +#include "iommu-bits.h"
> +#include "iommu.h"
> +
> +static int riscv_iommu_platform_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct riscv_iommu_device *iommu = NULL;
> + struct resource *res = NULL;
> + int ret = 0;
> +
> + iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
> + if (!iommu)
> + return -ENOMEM;
> +
> + iommu->dev = dev;
> + dev_set_drvdata(dev, iommu);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(dev, "could not find resource for register region\n");
> + return -EINVAL;
> + }
> +
> + iommu->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> + if (IS_ERR(iommu->reg)) {
> + ret = dev_err_probe(dev, PTR_ERR(iommu->reg),
> + "could not map register region\n");
> + goto fail;
> + };
> +
> + iommu->reg_phys = res->start;
> +
> + ret = -ENODEV;
> +
> + /* Sanity check: Did we get the whole register space ? */
> + if ((res->end - res->start + 1) < RISCV_IOMMU_REG_SIZE) {
> + dev_err(dev, "device region smaller than register file (0x%llx)\n",
> + res->end - res->start);
> + goto fail;
> + }
Could we assume that DT should be responsible for specifying the right size?
> +
> + dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> +
> + return riscv_iommu_init(iommu);
> +
> + fail:
> + /* Note: devres_release_all() will release iommu and iommu->reg */
> + return ret;
> +};
> +
> +static void riscv_iommu_platform_remove(struct platform_device *pdev)
> +{
> + riscv_iommu_remove(dev_get_drvdata(&pdev->dev));
> +};
> +
> +static void riscv_iommu_platform_shutdown(struct platform_device *pdev)
> +{
> + return;
> +};
> +
> +static const struct of_device_id riscv_iommu_of_match[] = {
> + {.compatible = "riscv,iommu",},
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, riscv_iommu_of_match);
> +
> +static struct platform_driver riscv_iommu_platform_driver = {
> + .driver = {
> + .name = "riscv,iommu",
> + .of_match_table = riscv_iommu_of_match,
> + .suppress_bind_attrs = true,
> + },
> + .probe = riscv_iommu_platform_probe,
> + .remove_new = riscv_iommu_platform_remove,
> + .shutdown = riscv_iommu_platform_shutdown,
> +};
> +
> +module_driver(riscv_iommu_platform_driver, platform_driver_register,
> + platform_driver_unregister);
> diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c
> new file mode 100644
> index 000000000000..8c236242e2cc
> --- /dev/null
> +++ b/drivers/iommu/riscv/iommu.c
> @@ -0,0 +1,660 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * IOMMU API for RISC-V architected Ziommu implementations.
> + *
> + * Copyright © 2022-2023 Rivos Inc.
> + * Copyright © 2023 FORTH-ICS/CARV
> + *
> + * Authors
> + * Tomasz Jeznach <tjeznach@xxxxxxxxxxxx>
> + * Nick Kossifidis <mick@xxxxxxxxxxxx>
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/bitfield.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/compiler.h>
> +#include <linux/pci.h>
> +#include <linux/pci-ats.h>
> +#include <linux/init.h>
> +#include <linux/completion.h>
> +#include <linux/uaccess.h>
> +#include <linux/iommu.h>
> +#include <linux/irqdomain.h>
> +#include <linux/platform_device.h>
> +#include <linux/dma-map-ops.h>
> +#include <asm/page.h>
> +
> +#include "../dma-iommu.h"
> +#include "../iommu-sva.h"
> +#include "iommu.h"
> +
> +#include <asm/csr.h>
> +#include <asm/delay.h>
> +
> +MODULE_DESCRIPTION("IOMMU driver for RISC-V architected Ziommu implementations");
> +MODULE_AUTHOR("Tomasz Jeznach <tjeznach@xxxxxxxxxxxx>");
> +MODULE_AUTHOR("Nick Kossifidis <mick@xxxxxxxxxxxx>");
> +MODULE_ALIAS("riscv-iommu");
> +MODULE_LICENSE("GPL v2");
> +
> +/* Global IOMMU params. */
> +static int ddt_mode = RISCV_IOMMU_DDTP_MODE_BARE;
> +module_param(ddt_mode, int, 0644);
> +MODULE_PARM_DESC(ddt_mode, "Device Directory Table mode.");
> +
> +/* IOMMU PSCID allocation namespace. */
> +#define RISCV_IOMMU_MAX_PSCID (1U << 20)
> +static DEFINE_IDA(riscv_iommu_pscids);
> +
> +/* 1 second */
> +#define RISCV_IOMMU_TIMEOUT riscv_timebase
> +
> +/* RISC-V IOMMU PPN <> PHYS address conversions, PHYS <=> PPN[53:10] */
> +#define phys_to_ppn(va) (((va) >> 2) & (((1ULL << 44) - 1) << 10))
> +#define ppn_to_phys(pn) (((pn) << 2) & (((1ULL << 44) - 1) << 12))
> +
> +#define iommu_domain_to_riscv(iommu_domain) \
> + container_of(iommu_domain, struct riscv_iommu_domain, domain)
> +
> +#define iommu_device_to_riscv(iommu_device) \
> + container_of(iommu_device, struct riscv_iommu, iommu)
> +
> +static const struct iommu_domain_ops riscv_iommu_domain_ops;
> +static const struct iommu_ops riscv_iommu_ops;
> +
> +/*
> + * Register device for IOMMU tracking.
> + */
> +static void riscv_iommu_add_device(struct riscv_iommu_device *iommu, struct device *dev)
> +{
> + struct riscv_iommu_endpoint *ep, *rb_ep;
> + struct rb_node **new_node, *parent_node = NULL;
> +
> + mutex_lock(&iommu->eps_mutex);
> +
> + ep = dev_iommu_priv_get(dev);
> +
> + new_node = &(iommu->eps.rb_node);
> + while (*new_node) {
> + rb_ep = rb_entry(*new_node, struct riscv_iommu_endpoint, node);
> + parent_node = *new_node;
> + if (rb_ep->devid > ep->devid) {
> + new_node = &((*new_node)->rb_left);
> + } else if (rb_ep->devid < ep->devid) {
> + new_node = &((*new_node)->rb_right);
> + } else {
> + dev_warn(dev, "device %u already in the tree\n", ep->devid);
> + break;
> + }
> + }
> +
> + rb_link_node(&ep->node, parent_node, new_node);
> + rb_insert_color(&ep->node, &iommu->eps);
> +
> + mutex_unlock(&iommu->eps_mutex);
> +}
> +
> +/*
> + * Endpoint management
> + */
> +
> +static int riscv_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
> +{
> + return iommu_fwspec_add_ids(dev, args->args, 1);
> +}
> +
> +static bool riscv_iommu_capable(struct device *dev, enum iommu_cap cap)
> +{
> + switch (cap) {
> + case IOMMU_CAP_CACHE_COHERENCY:
> + case IOMMU_CAP_PRE_BOOT_PROTECTION:
> + return true;
> +
> + default:
> + break;
> + }
> +
> + return false;
> +}
> +
> +static struct iommu_device *riscv_iommu_probe_device(struct device *dev)
> +{
> + struct riscv_iommu_device *iommu;
> + struct riscv_iommu_endpoint *ep;
> + struct iommu_fwspec *fwspec;
> +
> + fwspec = dev_iommu_fwspec_get(dev);
> + if (!fwspec || fwspec->ops != &riscv_iommu_ops ||
> + !fwspec->iommu_fwnode || !fwspec->iommu_fwnode->dev)
> + return ERR_PTR(-ENODEV);
> +
> + iommu = dev_get_drvdata(fwspec->iommu_fwnode->dev);
> + if (!iommu)
> + return ERR_PTR(-ENODEV);
> +
> + if (dev_iommu_priv_get(dev))
> + return &iommu->iommu;
> +
> + ep = kzalloc(sizeof(*ep), GFP_KERNEL);
> + if (!ep)
> + return ERR_PTR(-ENOMEM);
> +
> + mutex_init(&ep->lock);
> + INIT_LIST_HEAD(&ep->domain);
> +
> + if (dev_is_pci(dev)) {
> + ep->devid = pci_dev_id(to_pci_dev(dev));
> + ep->domid = pci_domain_nr(to_pci_dev(dev)->bus);
> + } else {
> + /* TODO: Make this generic, for now hardcode domain id to 0 */
> + ep->devid = fwspec->ids[0];
> + ep->domid = 0;
> + }
> +
> + ep->iommu = iommu;
> + ep->dev = dev;
> +
> + dev_info(iommu->dev, "adding device to iommu with devid %i in domain %i\n",
> + ep->devid, ep->domid);
> +
> + dev_iommu_priv_set(dev, ep);
> + riscv_iommu_add_device(iommu, dev);
> +
> + return &iommu->iommu;
> +}
> +
> +static void riscv_iommu_probe_finalize(struct device *dev)
> +{
> + set_dma_ops(dev, NULL);
> + iommu_setup_dma_ops(dev, 0, U64_MAX);
> +}
> +
> +static void riscv_iommu_release_device(struct device *dev)
> +{
> + struct riscv_iommu_endpoint *ep = dev_iommu_priv_get(dev);
> + struct riscv_iommu_device *iommu = ep->iommu;
> +
> + dev_info(dev, "device with devid %i released\n", ep->devid);
> +
> + mutex_lock(&ep->lock);
> + list_del(&ep->domain);
> + mutex_unlock(&ep->lock);
> +
> + /* Remove endpoint from IOMMU tracking structures */
> + mutex_lock(&iommu->eps_mutex);
> + rb_erase(&ep->node, &iommu->eps);
> + mutex_unlock(&iommu->eps_mutex);
> +
> + set_dma_ops(dev, NULL);
> + dev_iommu_priv_set(dev, NULL);
> +
> + kfree(ep);
> +}
> +
> +static struct iommu_group *riscv_iommu_device_group(struct device *dev)
> +{
> + if (dev_is_pci(dev))
> + return pci_device_group(dev);
> + return generic_device_group(dev);
> +}
> +
> +static void riscv_iommu_get_resv_regions(struct device *dev, struct list_head *head)
> +{
> + iommu_dma_get_resv_regions(dev, head);
> +}
> +
> +/*
> + * Domain management
> + */
> +
> +static struct iommu_domain *riscv_iommu_domain_alloc(unsigned type)
> +{
> + struct riscv_iommu_domain *domain;
> +
> + if (type != IOMMU_DOMAIN_IDENTITY &&
> + type != IOMMU_DOMAIN_BLOCKED)
> + return NULL;
> +
> + domain = kzalloc(sizeof(*domain), GFP_KERNEL);
> + if (!domain)
> + return NULL;
> +
> + mutex_init(&domain->lock);
> + INIT_LIST_HEAD(&domain->endpoints);
> +
> + domain->domain.ops = &riscv_iommu_domain_ops;
> + domain->mode = RISCV_IOMMU_DC_FSC_MODE_BARE;
> + domain->pscid = ida_alloc_range(&riscv_iommu_pscids, 1,
> + RISCV_IOMMU_MAX_PSCID, GFP_KERNEL);
> +
> + printk("domain type %x alloc %u\n", type, domain->pscid);
> +
Could it uses pr_xxx instead of printk?
> + return &domain->domain;
> +}
> +
> +static void riscv_iommu_domain_free(struct iommu_domain *iommu_domain)
> +{
> + struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain);
> +
> + if (!list_empty(&domain->endpoints)) {
> + pr_warn("IOMMU domain is not empty!\n");
> + }
> +
> + if (domain->pgd_root)
> + free_pages((unsigned long)domain->pgd_root, 0);
> +
> + if ((int)domain->pscid > 0)
> + ida_free(&riscv_iommu_pscids, domain->pscid);
> +
> + printk("domain free %u\n", domain->pscid);
> +
Could it uses pr_xxx instead of printk?
> + kfree(domain);
> +}
> +
> +static int riscv_iommu_domain_finalize(struct riscv_iommu_domain *domain,
> + struct riscv_iommu_device *iommu)
> +{
> + struct iommu_domain_geometry *geometry;
> +
> + /* Domain assigned to another iommu */
> + if (domain->iommu && domain->iommu != iommu)
> + return -EINVAL;
> + /* Domain already initialized */
> + else if (domain->iommu)
> + return 0;
> +
> + /*
> + * TODO: Before using VA_BITS and satp_mode here, verify they
> + * are supported by the iommu, through the capabilities register.
> + */
> +
> + geometry = &domain->domain.geometry;
> +
> + /*
> + * Note: RISC-V Privilege spec mandates that virtual addresses
> + * need to be sign-extended, so if (VA_BITS - 1) is set, all
> + * bits >= VA_BITS need to also be set or else we'll get a
> + * page fault. However the code that creates the mappings
> + * above us (e.g. iommu_dma_alloc_iova()) won't do that for us
> + * for now, so we'll end up with invalid virtual addresses
> + * to map. As a workaround until we get this sorted out
> + * limit the available virtual addresses to VA_BITS - 1.
> + */
> + geometry->aperture_start = 0;
> + geometry->aperture_end = DMA_BIT_MASK(VA_BITS - 1);
> + geometry->force_aperture = true;
> +
> + domain->iommu = iommu;
> +
> + if (domain->domain.type == IOMMU_DOMAIN_IDENTITY)
> + return 0;
> +
> + /* TODO: Fix this for RV32 */
> + domain->mode = satp_mode >> 60;
> + domain->pgd_root = (pgd_t *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
> +
> + if (!domain->pgd_root)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +static int riscv_iommu_attach_dev(struct iommu_domain *iommu_domain, struct device *dev)
> +{
> + struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain);
> + struct riscv_iommu_endpoint *ep = dev_iommu_priv_get(dev);
> + int ret;
> +
> + /* PSCID not valid */
> + if ((int)domain->pscid < 0)
> + return -ENOMEM;
> +
> + mutex_lock(&domain->lock);
> + mutex_lock(&ep->lock);
> +
> + if (!list_empty(&ep->domain)) {
> + dev_warn(dev, "endpoint already attached to a domain. dropping\n");
> + list_del_init(&ep->domain);
> + }
> +
> + /* allocate root pages, initialize io-pgtable ops, etc. */
> + ret = riscv_iommu_domain_finalize(domain, ep->iommu);
> + if (ret < 0) {
> + dev_err(dev, "can not finalize domain: %d\n", ret);
> + mutex_unlock(&ep->lock);
> + mutex_unlock(&domain->lock);
> + return ret;
> + }
> +
> + if (ep->iommu->ddt_mode != RISCV_IOMMU_DDTP_MODE_BARE ||
> + domain->domain.type != IOMMU_DOMAIN_IDENTITY) {
> + dev_warn(dev, "domain type %d not supported\n",
> + domain->domain.type);
> + return -ENODEV;
> + }
> +
> + list_add_tail(&ep->domain, &domain->endpoints);
> + mutex_unlock(&ep->lock);
> + mutex_unlock(&domain->lock);
> +
> + dev_info(dev, "domain type %d attached w/ PSCID %u\n",
> + domain->domain.type, domain->pscid);
> +
> + return 0;
> +}
> +
> +static void riscv_iommu_flush_iotlb_range(struct iommu_domain *iommu_domain,
> + unsigned long *start, unsigned long *end,
> + size_t *pgsize)
> +{
> + /* Command interface not implemented */
> +}
> +
> +static void riscv_iommu_flush_iotlb_all(struct iommu_domain *iommu_domain)
> +{
> + riscv_iommu_flush_iotlb_range(iommu_domain, NULL, NULL, NULL);
> +}
> +
> +static void riscv_iommu_iotlb_sync(struct iommu_domain *iommu_domain,
> + struct iommu_iotlb_gather *gather)
> +{
> + riscv_iommu_flush_iotlb_range(iommu_domain, &gather->start, &gather->end,
> + &gather->pgsize);
> +}
> +
> +static void riscv_iommu_iotlb_sync_map(struct iommu_domain *iommu_domain,
> + unsigned long iova, size_t size)
> +{
> + unsigned long end = iova + size - 1;
> + /*
> + * Given we don't know the page size used by this range, we assume the
> + * smallest page size to ensure all possible entries are flushed from
> + * the IOATC.
> + */
> + size_t pgsize = PAGE_SIZE;
> + riscv_iommu_flush_iotlb_range(iommu_domain, &iova, &end, &pgsize);
> +}
> +
> +static int riscv_iommu_map_pages(struct iommu_domain *iommu_domain,
> + unsigned long iova, phys_addr_t phys,
> + size_t pgsize, size_t pgcount, int prot,
> + gfp_t gfp, size_t *mapped)
> +{
> + struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain);
> +
> + if (domain->domain.type == IOMMU_DOMAIN_IDENTITY) {
> + *mapped = pgsize * pgcount;
> + return 0;
> + }
> +
> + return -ENODEV;
> +}
> +
> +static size_t riscv_iommu_unmap_pages(struct iommu_domain *iommu_domain,
> + unsigned long iova, size_t pgsize,
> + size_t pgcount, struct iommu_iotlb_gather *gather)
> +{
> + struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain);
> +
> + if (domain->domain.type == IOMMU_DOMAIN_IDENTITY)
> + return pgsize * pgcount;
> +
> + return 0;
> +}
> +
> +static phys_addr_t riscv_iommu_iova_to_phys(struct iommu_domain *iommu_domain,
> + dma_addr_t iova)
> +{
> + struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain);
> +
> + if (domain->domain.type == IOMMU_DOMAIN_IDENTITY)
> + return (phys_addr_t) iova;
> +
> + return 0;
> +}
> +
> +/*
> + * Translation mode setup
> + */
> +
> +static u64 riscv_iommu_get_ddtp(struct riscv_iommu_device *iommu)
> +{
> + u64 ddtp;
> + cycles_t end_cycles = RISCV_IOMMU_TIMEOUT + get_cycles();
> +
> + /* Wait for DDTP.BUSY to be cleared and return latest value */
> + do {
> + ddtp = riscv_iommu_readq(iommu, RISCV_IOMMU_REG_DDTP);
> + if (!(ddtp & RISCV_IOMMU_DDTP_BUSY))
> + break;
> + cpu_relax();
> + } while (get_cycles() < end_cycles);
> +
> + return ddtp;
> +}
> +
> +static void riscv_iommu_ddt_cleanup(struct riscv_iommu_device *iommu)
> +{
> + /* TODO: teardown whole device directory tree. */
> + if (iommu->ddtp) {
> + if (iommu->ddtp_in_iomem) {
> + iounmap((void *)iommu->ddtp);
> + } else
> + free_page(iommu->ddtp);
> + iommu->ddtp = 0;
> + }
> +}
> +
> +static int riscv_iommu_enable(struct riscv_iommu_device *iommu, unsigned requested_mode)
> +{
> + struct device *dev = iommu->dev;
> + u64 ddtp = 0;
> + u64 ddtp_paddr = 0;
> + unsigned mode = requested_mode;
> + unsigned mode_readback = 0;
> +
> + ddtp = riscv_iommu_get_ddtp(iommu);
> + if (ddtp & RISCV_IOMMU_DDTP_BUSY)
> + return -EBUSY;
> +
> + /* Disallow state transtion from xLVL to xLVL. */
> + switch (FIELD_GET(RISCV_IOMMU_DDTP_MODE, ddtp)) {
> + case RISCV_IOMMU_DDTP_MODE_BARE:
> + case RISCV_IOMMU_DDTP_MODE_OFF:
> + break;
> + default:
> + if ((mode != RISCV_IOMMU_DDTP_MODE_BARE)
> + && (mode != RISCV_IOMMU_DDTP_MODE_OFF))
> + return -EINVAL;
> + break;
> + }
> +
> + retry:
We need to consider the `iommu.passthrough` before we set up the mode
in switch case, something like
if (iommu_default_passthrough()) {
/* set ddtp to bare mode */
}
> + switch (mode) {
> + case RISCV_IOMMU_DDTP_MODE_BARE:
> + case RISCV_IOMMU_DDTP_MODE_OFF:
> + riscv_iommu_ddt_cleanup(iommu);
> + ddtp = FIELD_PREP(RISCV_IOMMU_DDTP_MODE, mode);
> + break;
> + case RISCV_IOMMU_DDTP_MODE_1LVL:
> + case RISCV_IOMMU_DDTP_MODE_2LVL:
> + case RISCV_IOMMU_DDTP_MODE_3LVL:
> + if (!iommu->ddtp) {
> + /*
> + * We haven't initialized ddtp yet, since it's WARL make
> + * sure that we don't have a hardwired PPN field there
> + * that points to i/o memory instead.
> + */
> + riscv_iommu_writeq(iommu, RISCV_IOMMU_REG_DDTP, 0);
> + ddtp = riscv_iommu_get_ddtp(iommu);
> + ddtp_paddr = ppn_to_phys(ddtp);
> + if (ddtp_paddr) {
> + dev_warn(dev, "ddtp at 0x%llx\n", ddtp_paddr);
> + iommu->ddtp =
> + (unsigned long)ioremap(ddtp_paddr, PAGE_SIZE);
> + iommu->ddtp_in_iomem = true;
> + } else {
> + iommu->ddtp = get_zeroed_page(GFP_KERNEL);
> + }
> + }
> + if (!iommu->ddtp)
> + return -ENOMEM;
> +
> + ddtp = FIELD_PREP(RISCV_IOMMU_DDTP_MODE, mode) |
> + phys_to_ppn(__pa(iommu->ddtp));
> +
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + riscv_iommu_writeq(iommu, RISCV_IOMMU_REG_DDTP, ddtp);
> + ddtp = riscv_iommu_get_ddtp(iommu);
> + if (ddtp & RISCV_IOMMU_DDTP_BUSY) {
> + dev_warn(dev, "timeout when setting ddtp (ddt mode: %i)\n", mode);
> + return -EBUSY;
> + }
> +
> + mode_readback = FIELD_GET(RISCV_IOMMU_DDTP_MODE, ddtp);
> + dev_info(dev, "mode_readback: %i, mode: %i\n", mode_readback, mode);
> + if (mode_readback != mode) {
> + /*
> + * Mode field is WARL, an I/O MMU may support a subset of
> + * directory table levels in which case if we tried to set
> + * an unsupported number of levels we'll readback either
> + * a valid xLVL or off/bare. If we got off/bare, try again
> + * with a smaller xLVL.
> + */
> + if (mode_readback < RISCV_IOMMU_DDTP_MODE_1LVL &&
> + mode > RISCV_IOMMU_DDTP_MODE_1LVL) {
> + mode--;
> + goto retry;
> + }
> +
> + /*
> + * We tried all supported xLVL modes and still got off/bare instead,
> + * an I/O MMU must support at least one supported xLVL mode so something
> + * went very wrong.
> + */
> + if (mode_readback < RISCV_IOMMU_DDTP_MODE_1LVL &&
> + mode == RISCV_IOMMU_DDTP_MODE_1LVL)
> + goto fail;
> +
> + /*
> + * We tried setting off or bare and got something else back, something
> + * went very wrong since off/bare is always legal.
> + */
> + if (mode < RISCV_IOMMU_DDTP_MODE_1LVL)
> + goto fail;
> +
> + /*
> + * We tried setting an xLVL mode but got another xLVL mode that
> + * we don't support (e.g. a custom one).
> + */
> + if (mode_readback > RISCV_IOMMU_DDTP_MODE_MAX)
> + goto fail;
> +
> + /* We tried setting an xLVL mode but got another supported xLVL mode */
> + mode = mode_readback;
> + }
> +
> + if (mode != requested_mode)
> + dev_warn(dev, "unsupported DDT mode requested (%i), using %i instead\n",
> + requested_mode, mode);
> +
> + iommu->ddt_mode = mode;
> + dev_info(dev, "ddt_mode: %i\n", iommu->ddt_mode);
> + return 0;
> +
> + fail:
> + dev_err(dev, "failed to set DDT mode, tried: %i and got %i\n", mode,
> + mode_readback);
> + riscv_iommu_ddt_cleanup(iommu);
> + return -EINVAL;
> +}
> +
> +/*
> + * Common I/O MMU driver probe/teardown
> + */
> +
> +static const struct iommu_domain_ops riscv_iommu_domain_ops = {
> + .free = riscv_iommu_domain_free,
> + .attach_dev = riscv_iommu_attach_dev,
> + .map_pages = riscv_iommu_map_pages,
> + .unmap_pages = riscv_iommu_unmap_pages,
> + .iova_to_phys = riscv_iommu_iova_to_phys,
> + .iotlb_sync = riscv_iommu_iotlb_sync,
> + .iotlb_sync_map = riscv_iommu_iotlb_sync_map,
> + .flush_iotlb_all = riscv_iommu_flush_iotlb_all,
> +};
> +
> +static const struct iommu_ops riscv_iommu_ops = {
> + .owner = THIS_MODULE,
> + .pgsize_bitmap = SZ_4K | SZ_2M | SZ_512M,
> + .capable = riscv_iommu_capable,
> + .domain_alloc = riscv_iommu_domain_alloc,
> + .probe_device = riscv_iommu_probe_device,
> + .probe_finalize = riscv_iommu_probe_finalize,
> + .release_device = riscv_iommu_release_device,
> + .device_group = riscv_iommu_device_group,
> + .get_resv_regions = riscv_iommu_get_resv_regions,
> + .of_xlate = riscv_iommu_of_xlate,
> + .default_domain_ops = &riscv_iommu_domain_ops,
> +};
> +
> +void riscv_iommu_remove(struct riscv_iommu_device *iommu)
> +{
> + iommu_device_unregister(&iommu->iommu);
> + riscv_iommu_enable(iommu, RISCV_IOMMU_DDTP_MODE_OFF);
> +}
> +
> +int riscv_iommu_init(struct riscv_iommu_device *iommu)
> +{
> + struct device *dev = iommu->dev;
> + u32 fctl = 0;
> + int ret;
> +
> + iommu->eps = RB_ROOT;
> +
> + fctl = riscv_iommu_readl(iommu, RISCV_IOMMU_REG_FCTL);
> +
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> + if (!(cap & RISCV_IOMMU_CAP_END)) {
> + dev_err(dev, "IOMMU doesn't support Big Endian\n");
> + return -EIO;
> + } else if (!(fctl & RISCV_IOMMU_FCTL_BE)) {
> + fctl |= FIELD_PREP(RISCV_IOMMU_FCTL_BE, 1);
> + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_FCTL, fctl);
> + }
> +#endif
> +
> + /* Clear any pending interrupt flag. */
> + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_IPSR,
> + RISCV_IOMMU_IPSR_CIP |
> + RISCV_IOMMU_IPSR_FIP |
> + RISCV_IOMMU_IPSR_PMIP | RISCV_IOMMU_IPSR_PIP);
> + spin_lock_init(&iommu->cq_lock);
> + mutex_init(&iommu->eps_mutex);
> +
> + ret = riscv_iommu_enable(iommu, RISCV_IOMMU_DDTP_MODE_BARE);
> +
> + if (ret) {
> + dev_err(dev, "cannot enable iommu device (%d)\n", ret);
> + goto fail;
> + }
> +
> + ret = iommu_device_register(&iommu->iommu, &riscv_iommu_ops, dev);
> + if (ret) {
> + dev_err(dev, "cannot register iommu interface (%d)\n", ret);
> + iommu_device_sysfs_remove(&iommu->iommu);
> + goto fail;
> + }
> +
> + return 0;
> + fail:
> + riscv_iommu_enable(iommu, RISCV_IOMMU_DDTP_MODE_OFF);
> + return ret;
> +}
> diff --git a/drivers/iommu/riscv/iommu.h b/drivers/iommu/riscv/iommu.h
> new file mode 100644
> index 000000000000..7baefd3630b3
> --- /dev/null
> +++ b/drivers/iommu/riscv/iommu.h
> @@ -0,0 +1,115 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright © 2022-2023 Rivos Inc.
> + * Copyright © 2023 FORTH-ICS/CARV
> + *
> + * RISC-V Ziommu - IOMMU Interface Specification.
> + *
> + * Authors
> + * Tomasz Jeznach <tjeznach@xxxxxxxxxxxx>
> + * Nick Kossifidis <mick@xxxxxxxxxxxx>
> + */
> +
> +#ifndef _RISCV_IOMMU_H_
> +#define _RISCV_IOMMU_H_
> +
> +#include <linux/types.h>
> +#include <linux/iova.h>
> +#include <linux/io.h>
> +#include <linux/idr.h>
> +#include <linux/list.h>
> +#include <linux/iommu.h>
> +#include <linux/io-pgtable.h>
> +
> +#include "iommu-bits.h"
> +
> +#define IOMMU_PAGE_SIZE_4K BIT_ULL(12)
> +#define IOMMU_PAGE_SIZE_2M BIT_ULL(21)
> +#define IOMMU_PAGE_SIZE_1G BIT_ULL(30)
> +#define IOMMU_PAGE_SIZE_512G BIT_ULL(39)
> +
> +struct riscv_iommu_device {
> + struct iommu_device iommu; /* iommu core interface */
> + struct device *dev; /* iommu hardware */
> +
> + /* hardware control register space */
> + void __iomem *reg;
> + resource_size_t reg_phys;
> +
> + /* IRQs for the various queues */
> + int irq_cmdq;
> + int irq_fltq;
> + int irq_pm;
> + int irq_priq;
> +
> + /* supported and enabled hardware capabilities */
> + u64 cap;
> +
> + /* global lock, to be removed */
> + spinlock_t cq_lock;
> +
> + /* device directory table root pointer and mode */
> + unsigned long ddtp;
> + unsigned ddt_mode;
> + bool ddtp_in_iomem;
> +
> + /* Connected end-points */
> + struct rb_root eps;
> + struct mutex eps_mutex;
> +};
> +
> +struct riscv_iommu_domain {
> + struct iommu_domain domain;
> +
> + struct list_head endpoints;
> + struct mutex lock;
> + struct riscv_iommu_device *iommu;
> +
> + unsigned mode; /* RIO_ATP_MODE_* enum */
> + unsigned pscid; /* RISC-V IOMMU PSCID */
> +
> + pgd_t *pgd_root; /* page table root pointer */
> +};
> +
> +/* Private dev_iommu_priv object, device-domain relationship. */
> +struct riscv_iommu_endpoint {
> + struct device *dev; /* platform or PCI endpoint device */
> + unsigned devid; /* PCI bus:device:function number */
> + unsigned domid; /* PCI domain number, segment */
> + struct rb_node node; /* device tracking node (lookup by devid) */
> + struct riscv_iommu_device *iommu; /* parent iommu device */
> +
> + struct mutex lock;
> + struct list_head domain; /* endpoint attached managed domain */
> +};
> +
> +/* Helper functions and macros */
> +
> +static inline u32 riscv_iommu_readl(struct riscv_iommu_device *iommu,
> + unsigned offset)
> +{
> + return readl_relaxed(iommu->reg + offset);
> +}
> +
> +static inline void riscv_iommu_writel(struct riscv_iommu_device *iommu,
> + unsigned offset, u32 val)
> +{
> + writel_relaxed(val, iommu->reg + offset);
> +}
> +
> +static inline u64 riscv_iommu_readq(struct riscv_iommu_device *iommu,
> + unsigned offset)
> +{
> + return readq_relaxed(iommu->reg + offset);
> +}
> +
> +static inline void riscv_iommu_writeq(struct riscv_iommu_device *iommu,
> + unsigned offset, u64 val)
> +{
> + writeq_relaxed(val, iommu->reg + offset);
> +}
> +
> +int riscv_iommu_init(struct riscv_iommu_device *iommu);
> +void riscv_iommu_remove(struct riscv_iommu_device *iommu);
> +
> +#endif
> --
> 2.34.1
>
>
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