On Sat, May 4, 2024 at 12:13 AM Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> wrote: > > Introduce platform device driver for implementation of RISC-V IOMMU > architected hardware. > > Hardware interface definition located in file iommu-bits.h is based on > ratified RISC-V IOMMU Architecture Specification version 1.0.0. > > This patch implements platform device initialization, early check and > configuration of the IOMMU interfaces and enables global pass-through > address translation mode (iommu_mode == BARE), without registering > hardware instance in the IOMMU subsystem. > > Link: https://github.com/riscv-non-isa/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> > --- > MAINTAINERS | 1 + > drivers/iommu/Kconfig | 1 + > drivers/iommu/Makefile | 2 +- > drivers/iommu/riscv/Kconfig | 15 + > drivers/iommu/riscv/Makefile | 2 + > drivers/iommu/riscv/iommu-bits.h | 707 +++++++++++++++++++++++++++ > drivers/iommu/riscv/iommu-platform.c | 92 ++++ > drivers/iommu/riscv/iommu.c | 99 ++++ > drivers/iommu/riscv/iommu.h | 62 +++ > 9 files changed, 980 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-platform.c > create mode 100644 drivers/iommu/riscv/iommu.c > create mode 100644 drivers/iommu/riscv/iommu.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index 7fcf7c27ef6b..42df3b3871f4 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -18964,6 +18964,7 @@ L: iommu@xxxxxxxxxxxxxxx > L: linux-riscv@xxxxxxxxxxxxxxxxxxx > S: Maintained > F: Documentation/devicetree/bindings/iommu/riscv,iommu.yaml > +F: drivers/iommu/riscv/ > > RISC-V MICROCHIP FPGA SUPPORT > M: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig > index 0af39bbbe3a3..ae762db0365e 100644 > --- a/drivers/iommu/Kconfig > +++ b/drivers/iommu/Kconfig > @@ -195,6 +195,7 @@ 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 542760d963ec..5e5a83c6c2aa 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-$(CONFIG_IOMMU_API) += iommu-sysfs.o > diff --git a/drivers/iommu/riscv/Kconfig b/drivers/iommu/riscv/Kconfig > new file mode 100644 > index 000000000000..5dcc5c45aa50 > --- /dev/null > +++ b/drivers/iommu/riscv/Kconfig > @@ -0,0 +1,15 @@ > +# SPDX-License-Identifier: GPL-2.0-only > +# RISC-V IOMMU support > + > +config RISCV_IOMMU > + bool "RISC-V IOMMU Support" > + depends on RISCV && 64BIT > + default y > + select IOMMU_API > + help > + Support for implementations of the RISC-V IOMMU architecture that > + complements the RISC-V MMU capabilities, providing similar address > + translation and protection functions for accesses from I/O devices. > + > + Say Y here if your SoC includes an IOMMU device implementing > + the RISC-V IOMMU architecture. > diff --git a/drivers/iommu/riscv/Makefile b/drivers/iommu/riscv/Makefile > new file mode 100644 > index 000000000000..e4c189de58d3 > --- /dev/null > +++ b/drivers/iommu/riscv/Makefile > @@ -0,0 +1,2 @@ > +# SPDX-License-Identifier: GPL-2.0-only > +obj-$(CONFIG_RISCV_IOMMU) += iommu.o iommu-platform.o > diff --git a/drivers/iommu/riscv/iommu-bits.h b/drivers/iommu/riscv/iommu-bits.h > new file mode 100644 > index 000000000000..ba093c29de9f > --- /dev/null > +++ b/drivers/iommu/riscv/iommu-bits.h > @@ -0,0 +1,707 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Copyright © 2022-2024 Rivos Inc. > + * Copyright © 2023 FORTH-ICS/CARV > + * Copyright © 2023 RISC-V IOMMU Task Group > + * > + * RISC-V IOMMU - 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_AMO_MRIF BIT_ULL(21) > +#define RISCV_IOMMU_CAP_MSI_FLAT BIT_ULL(22) > +#define RISCV_IOMMU_CAP_MSI_MRIF BIT_ULL(23) > +#define RISCV_IOMMU_CAP_AMO_HWAD 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 > + * @RISCV_IOMMU_DDTP_MODE_MAX: Max value allowed by specification > + */ > +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_CNT 31 > +#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) > + Could we use ICVEC instead of IVEC for aligning the term in spec? If it is ok, you might also need to modify it in riscv_iommu_device structure. > +/* 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 > + * @msiptp: MSI page table pointer > + * @msi_addr_mask: MSI address mask > + * @msi_addr_pattern: MSI address pattern > + * @_reserved: Reserved for future use, padding > + * > + * 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_command - 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[61:10] is the 4K-aligned page address */ > +#define RISCV_IOMMU_CMD_IOTINVAL_ADDR GENMASK_ULL(61, 10) > + > +/* 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 aligned 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 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-platform.c b/drivers/iommu/riscv/iommu-platform.c > new file mode 100644 > index 000000000000..1b453334fbbe > --- /dev/null > +++ b/drivers/iommu/riscv/iommu-platform.c > @@ -0,0 +1,92 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * RISC-V IOMMU as a platform device > + * > + * Copyright © 2023 FORTH-ICS/CARV > + * Copyright © 2023-2024 Rivos Inc. > + * > + * Authors > + * Nick Kossifidis <mick@xxxxxxxxxxxx> > + * Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> > + */ > + > +#include <linux/kernel.h> > +#include <linux/of_platform.h> > +#include <linux/platform_device.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 vec; > + > + iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL); > + if (!iommu) > + return -ENOMEM; > + > + iommu->dev = dev; > + iommu->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res); > + if (IS_ERR(iommu->reg)) > + return dev_err_probe(dev, PTR_ERR(iommu->reg), > + "could not map register region\n"); > + > + dev_set_drvdata(dev, iommu); > + > + /* Check device reported capabilities / features. */ > + iommu->caps = riscv_iommu_readq(iommu, RISCV_IOMMU_REG_CAP); > + iommu->fctl = riscv_iommu_readl(iommu, RISCV_IOMMU_REG_FCTL); > + > + /* For now we only support WSI */ > + switch (FIELD_GET(RISCV_IOMMU_CAP_IGS, iommu->caps)) { > + case RISCV_IOMMU_CAP_IGS_WSI: > + case RISCV_IOMMU_CAP_IGS_BOTH: > + break; > + default: > + return dev_err_probe(dev, -ENODEV, > + "unable to use wire-signaled interrupts\n"); > + } > + > + iommu->irqs_count = platform_irq_count(pdev); > + if (iommu->irqs_count <= 0) > + return dev_err_probe(dev, -ENODEV, > + "no IRQ resources provided\n"); > + if (iommu->irqs_count > RISCV_IOMMU_INTR_COUNT) > + iommu->irqs_count = RISCV_IOMMU_INTR_COUNT; > + > + for (vec = 0; vec < iommu->irqs_count; vec++) > + iommu->irqs[vec] = platform_get_irq(pdev, vec); > + > + /* Enable wire-signaled interrupts, fctl.WSI */ > + if (!(iommu->fctl & RISCV_IOMMU_FCTL_WSI)) { > + iommu->fctl |= RISCV_IOMMU_FCTL_WSI; > + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_FCTL, iommu->fctl); > + } > + > + return riscv_iommu_init(iommu); > +}; > + > +static void riscv_iommu_platform_remove(struct platform_device *pdev) > +{ > + riscv_iommu_remove(dev_get_drvdata(&pdev->dev)); > +}; > + > +static const struct of_device_id riscv_iommu_of_match[] = { > + {.compatible = "riscv,iommu",}, > + {}, > +}; > + > +static struct platform_driver riscv_iommu_platform_driver = { > + .probe = riscv_iommu_platform_probe, > + .remove_new = riscv_iommu_platform_remove, > + .driver = { > + .name = "riscv,iommu", > + .of_match_table = riscv_iommu_of_match, > + .suppress_bind_attrs = true, > + }, > +}; > + > +builtin_platform_driver(riscv_iommu_platform_driver); > diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c > new file mode 100644 > index 000000000000..3c5a6b49669d > --- /dev/null > +++ b/drivers/iommu/riscv/iommu.c > @@ -0,0 +1,99 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * IOMMU API for RISC-V IOMMU implementations. > + * > + * Copyright © 2022-2024 Rivos Inc. > + * Copyright © 2023 FORTH-ICS/CARV > + * > + * Authors > + * Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> > + * Nick Kossifidis <mick@xxxxxxxxxxxx> > + */ > + > +#define pr_fmt(fmt) "riscv-iommu: " fmt > + > +#include <linux/compiler.h> > +#include <linux/crash_dump.h> > +#include <linux/init.h> > +#include <linux/iommu.h> > +#include <linux/kernel.h> > + > +#include "iommu-bits.h" > +#include "iommu.h" > + > +/* Timeouts in [us] */ > +#define RISCV_IOMMU_DDTP_TIMEOUT 50000 > + > +/* > + * This is best effort IOMMU translation shutdown flow. > + * Disable IOMMU without waiting for hardware response. > + */ > +static void riscv_iommu_disable(struct riscv_iommu_device *iommu) > +{ > + riscv_iommu_writeq(iommu, RISCV_IOMMU_REG_DDTP, 0); > + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_CQCSR, 0); > + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_FQCSR, 0); > + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_PQCSR, 0); > +} > + > +static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) > +{ > + u64 ddtp; > + > + /* > + * Make sure the IOMMU is switched off or in pass-through mode during > + * regular boot flow and disable translation when we boot into a kexec > + * kernel and the previous kernel left them enabled. > + */ > + ddtp = riscv_iommu_readq(iommu, RISCV_IOMMU_REG_DDTP); > + if (ddtp & RISCV_IOMMU_DDTP_BUSY) > + return -EBUSY; > + > + if (FIELD_GET(RISCV_IOMMU_DDTP_MODE, ddtp) > RISCV_IOMMU_DDTP_MODE_BARE) { > + if (!is_kdump_kernel()) > + return -EBUSY; > + riscv_iommu_disable(iommu); > + } > + > + /* Configure accesses to in-memory data structures for CPU-native byte order. */ > + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) != !!(iommu->fctl & RISCV_IOMMU_FCTL_BE)) { > + if (!(iommu->caps & RISCV_IOMMU_CAP_END)) > + return -EINVAL; > + riscv_iommu_writel(iommu, RISCV_IOMMU_REG_FCTL, > + iommu->fctl ^ RISCV_IOMMU_FCTL_BE); > + iommu->fctl = riscv_iommu_readl(iommu, RISCV_IOMMU_REG_FCTL); > + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) != !!(iommu->fctl & RISCV_IOMMU_FCTL_BE)) > + return -EINVAL; > + } > + > + return 0; > +} > + > +void riscv_iommu_remove(struct riscv_iommu_device *iommu) > +{ > + iommu_device_sysfs_remove(&iommu->iommu); > +} > + > +int riscv_iommu_init(struct riscv_iommu_device *iommu) > +{ > + int rc; > + > + rc = riscv_iommu_init_check(iommu); > + if (rc) > + return dev_err_probe(iommu->dev, rc, "unexpected device state\n"); > + > + /* > + * Placeholder for a complete IOMMU device initialization. For now, > + * only bare minimum: enable global identity mapping mode and register sysfs. > + */ > + riscv_iommu_writeq(iommu, RISCV_IOMMU_REG_DDTP, > + FIELD_PREP(RISCV_IOMMU_DDTP_MODE, RISCV_IOMMU_DDTP_MODE_BARE)); > + > + rc = iommu_device_sysfs_add(&iommu->iommu, NULL, NULL, "riscv-iommu@%s", > + dev_name(iommu->dev)); > + if (rc) > + return dev_err_probe(iommu->dev, rc, > + "cannot register sysfs interface\n"); > + > + return 0; > +} > diff --git a/drivers/iommu/riscv/iommu.h b/drivers/iommu/riscv/iommu.h > new file mode 100644 > index 000000000000..700e33dc2446 > --- /dev/null > +++ b/drivers/iommu/riscv/iommu.h > @@ -0,0 +1,62 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Copyright © 2022-2024 Rivos Inc. > + * Copyright © 2023 FORTH-ICS/CARV > + * > + * Authors > + * Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> > + * Nick Kossifidis <mick@xxxxxxxxxxxx> > + */ > + > +#ifndef _RISCV_IOMMU_H_ > +#define _RISCV_IOMMU_H_ > + > +#include <linux/iommu.h> > +#include <linux/types.h> > +#include <linux/iopoll.h> > + > +#include "iommu-bits.h" > + > +struct riscv_iommu_device { > + /* iommu core interface */ > + struct iommu_device iommu; > + > + /* iommu hardware */ > + struct device *dev; > + > + /* hardware control register space */ > + void __iomem *reg; > + > + /* supported and enabled hardware capabilities */ > + u64 caps; > + u32 fctl; > + > + /* available interrupt numbers, MSI or WSI */ > + unsigned int irqs[RISCV_IOMMU_INTR_COUNT]; > + unsigned int irqs_count; > +}; > + > +int riscv_iommu_init(struct riscv_iommu_device *iommu); > +void riscv_iommu_remove(struct riscv_iommu_device *iommu); > + > +#define riscv_iommu_readl(iommu, addr) \ > + readl_relaxed((iommu)->reg + (addr)) > + > +#define riscv_iommu_readq(iommu, addr) \ > + readq_relaxed((iommu)->reg + (addr)) > + > +#define riscv_iommu_writel(iommu, addr, val) \ > + writel_relaxed((val), (iommu)->reg + (addr)) > + > +#define riscv_iommu_writeq(iommu, addr, val) \ > + writeq_relaxed((val), (iommu)->reg + (addr)) > + > +#define riscv_iommu_readq_timeout(iommu, addr, val, cond, delay_us, timeout_us) \ > + readx_poll_timeout(readq_relaxed, (iommu)->reg + (addr), val, cond, \ > + delay_us, timeout_us) > + > +#define riscv_iommu_readl_timeout(iommu, addr, val, cond, delay_us, timeout_us) \ > + readx_poll_timeout(readl_relaxed, (iommu)->reg + (addr), val, cond, \ > + delay_us, timeout_us) > + > +#endif > -- > 2.34.1 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-riscv
