On Fri, Aug 2, 2024 at 1:47 AM Daniel Henrique Barboza
<dbarb...@ventanamicro.com> wrote:
>
> From: Tomasz Jeznach <tjezn...@rivosinc.com>
>
> The RISC-V IOMMU specification is now ratified as-per the RISC-V
> international process. The latest frozen specifcation can be found at:
>
> https://github.com/riscv-non-isa/riscv-iommu/releases/download/v1.0/riscv-iommu.pdf
>
> Add the foundation of the device emulation for RISC-V IOMMU. It includes
> support for s-stage (sv32, sv39, sv48, sv57 caps) and g-stage (sv32x4,
> sv39x4, sv48x4, sv57x4 caps).
>
> Other capabilities like ATS and DBG support will be added incrementally
> in the next patches.
>
> Co-developed-by: Sebastien Boeuf <s...@rivosinc.com>
> Signed-off-by: Sebastien Boeuf <s...@rivosinc.com>
> Signed-off-by: Tomasz Jeznach <tjezn...@rivosinc.com>
> Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
Acked-by: Alistair Francis <alistair.fran...@wdc.com>
Alistair
> ---
> hw/riscv/Kconfig | 4 +
> hw/riscv/meson.build | 1 +
> hw/riscv/riscv-iommu-bits.h | 14 +
> hw/riscv/riscv-iommu.c | 2017 +++++++++++++++++++++++++++++++++++
> hw/riscv/riscv-iommu.h | 148 +++
> hw/riscv/trace-events | 12 +
> hw/riscv/trace.h | 1 +
> include/hw/riscv/iommu.h | 36 +
> meson.build | 1 +
> 9 files changed, 2234 insertions(+)
> create mode 100644 hw/riscv/riscv-iommu.c
> create mode 100644 hw/riscv/riscv-iommu.h
> create mode 100644 hw/riscv/trace-events
> create mode 100644 hw/riscv/trace.h
> create mode 100644 include/hw/riscv/iommu.h
>
> diff --git a/hw/riscv/Kconfig b/hw/riscv/Kconfig
> index a2030e3a6f..f69d6e3c8e 100644
> --- a/hw/riscv/Kconfig
> +++ b/hw/riscv/Kconfig
> @@ -1,3 +1,6 @@
> +config RISCV_IOMMU
> + bool
> +
> config RISCV_NUMA
> bool
>
> @@ -47,6 +50,7 @@ config RISCV_VIRT
> select SERIAL
> select RISCV_ACLINT
> select RISCV_APLIC
> + select RISCV_IOMMU
> select RISCV_IMSIC
> select SIFIVE_PLIC
> select SIFIVE_TEST
> diff --git a/hw/riscv/meson.build b/hw/riscv/meson.build
> index f872674093..cbc99c6e8e 100644
> --- a/hw/riscv/meson.build
> +++ b/hw/riscv/meson.build
> @@ -10,5 +10,6 @@ riscv_ss.add(when: 'CONFIG_SIFIVE_U', if_true:
> files('sifive_u.c'))
> riscv_ss.add(when: 'CONFIG_SPIKE', if_true: files('spike.c'))
> riscv_ss.add(when: 'CONFIG_MICROCHIP_PFSOC', if_true:
> files('microchip_pfsoc.c'))
> riscv_ss.add(when: 'CONFIG_ACPI', if_true: files('virt-acpi-build.c'))
> +riscv_ss.add(when: 'CONFIG_RISCV_IOMMU', if_true: files('riscv-iommu.c'))
>
> hw_arch += {'riscv': riscv_ss}
> diff --git a/hw/riscv/riscv-iommu-bits.h b/hw/riscv/riscv-iommu-bits.h
> index 9d9512ca71..6f1b9ab61b 100644
> --- a/hw/riscv/riscv-iommu-bits.h
> +++ b/hw/riscv/riscv-iommu-bits.h
> @@ -69,6 +69,14 @@ struct riscv_iommu_pq_record {
> /* 5.3 IOMMU Capabilities (64bits) */
> #define RISCV_IOMMU_REG_CAP 0x0000
> #define RISCV_IOMMU_CAP_VERSION GENMASK_ULL(7, 0)
> +#define RISCV_IOMMU_CAP_SV32 BIT_ULL(8)
> +#define RISCV_IOMMU_CAP_SV39 BIT_ULL(9)
> +#define RISCV_IOMMU_CAP_SV48 BIT_ULL(10)
> +#define RISCV_IOMMU_CAP_SV57 BIT_ULL(11)
> +#define RISCV_IOMMU_CAP_SV32X4 BIT_ULL(16)
> +#define RISCV_IOMMU_CAP_SV39X4 BIT_ULL(17)
> +#define RISCV_IOMMU_CAP_SV48X4 BIT_ULL(18)
> +#define RISCV_IOMMU_CAP_SV57X4 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_T2GPA BIT_ULL(26)
> @@ -80,7 +88,9 @@ struct riscv_iommu_pq_record {
>
> /* 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
> @@ -203,6 +213,8 @@ struct riscv_iommu_dc {
> #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)
> @@ -309,9 +321,11 @@ enum riscv_iommu_fq_causes {
>
> /* Translation attributes fields */
> #define RISCV_IOMMU_PC_TA_V BIT_ULL(0)
> +#define RISCV_IOMMU_PC_TA_RESERVED GENMASK_ULL(63, 32)
>
> /* First stage context fields */
> #define RISCV_IOMMU_PC_FSC_PPN GENMASK_ULL(43, 0)
> +#define RISCV_IOMMU_PC_FSC_RESERVED GENMASK_ULL(59, 44)
>
> enum riscv_iommu_fq_ttypes {
> RISCV_IOMMU_FQ_TTYPE_NONE = 0,
> diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c
> new file mode 100644
> index 0000000000..ebe3a53a04
> --- /dev/null
> +++ b/hw/riscv/riscv-iommu.c
> @@ -0,0 +1,2017 @@
> +/*
> + * QEMU emulation of an RISC-V IOMMU
> + *
> + * Copyright (C) 2021-2023, Rivos Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qom/object.h"
> +#include "hw/pci/pci_bus.h"
> +#include "hw/pci/pci_device.h"
> +#include "hw/qdev-properties.h"
> +#include "hw/riscv/riscv_hart.h"
> +#include "migration/vmstate.h"
> +#include "qapi/error.h"
> +#include "qemu/timer.h"
> +
> +#include "cpu_bits.h"
> +#include "riscv-iommu.h"
> +#include "riscv-iommu-bits.h"
> +#include "trace.h"
> +
> +#define LIMIT_CACHE_CTX (1U << 7)
> +#define LIMIT_CACHE_IOT (1U << 20)
> +
> +/* Physical page number coversions */
> +#define PPN_PHYS(ppn) ((ppn) << TARGET_PAGE_BITS)
> +#define PPN_DOWN(phy) ((phy) >> TARGET_PAGE_BITS)
> +
> +typedef struct RISCVIOMMUContext RISCVIOMMUContext;
> +typedef struct RISCVIOMMUEntry RISCVIOMMUEntry;
> +
> +/* Device assigned I/O address space */
> +struct RISCVIOMMUSpace {
> + IOMMUMemoryRegion iova_mr; /* IOVA memory region for attached device */
> + AddressSpace iova_as; /* IOVA address space for attached device */
> + RISCVIOMMUState *iommu; /* Managing IOMMU device state */
> + uint32_t devid; /* Requester identifier, AKA device_id */
> + bool notifier; /* IOMMU unmap notifier enabled */
> + QLIST_ENTRY(RISCVIOMMUSpace) list;
> +};
> +
> +/* Device translation context state. */
> +struct RISCVIOMMUContext {
> + uint64_t devid:24; /* Requester Id, AKA device_id */
> + uint64_t process_id:20; /* Process ID. PASID for PCIe */
> + uint64_t __rfu:20; /* reserved */
> + uint64_t tc; /* Translation Control */
> + uint64_t ta; /* Translation Attributes */
> + uint64_t satp; /* S-Stage address translation and
> protection */
> + uint64_t gatp; /* G-Stage address translation and
> protection */
> + uint64_t msi_addr_mask; /* MSI filtering - address mask */
> + uint64_t msi_addr_pattern; /* MSI filtering - address pattern */
> + uint64_t msiptp; /* MSI redirection page table pointer */
> +};
> +
> +/* IOMMU index for transactions without process_id specified. */
> +#define RISCV_IOMMU_NOPROCID 0
> +
> +static uint8_t riscv_iommu_get_icvec_vector(uint32_t icvec, uint32_t
> vec_type)
> +{
> + g_assert(vec_type < 4);
> + return (icvec >> (vec_type * 4)) & 0x0F;
> +}
> +
> +static void riscv_iommu_notify(RISCVIOMMUState *s, int vec)
> +{
> + const uint32_t fctl = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_FCTL);
> + uint32_t ipsr, icvec;
> +
> + if (fctl & RISCV_IOMMU_FCTL_WSI || !s->notify) {
> + return;
> + }
> +
> + icvec = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_ICVEC);
> + ipsr = riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_IPSR, (1 << vec), 0);
> +
> + if (!(ipsr & (1 << vec))) {
> + s->notify(s, riscv_iommu_get_icvec_vector(icvec, vec));
> + }
> +}
> +
> +static void riscv_iommu_fault(RISCVIOMMUState *s,
> + struct riscv_iommu_fq_record *ev)
> +{
> + uint32_t ctrl = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_FQCSR);
> + uint32_t head = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_FQH) &
> s->fq_mask;
> + uint32_t tail = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_FQT) &
> s->fq_mask;
> + uint32_t next = (tail + 1) & s->fq_mask;
> + uint32_t devid = get_field(ev->hdr, RISCV_IOMMU_FQ_HDR_DID);
> +
> + trace_riscv_iommu_flt(s->parent_obj.id, PCI_BUS_NUM(devid),
> PCI_SLOT(devid),
> + PCI_FUNC(devid), ev->hdr, ev->iotval);
> +
> + if (!(ctrl & RISCV_IOMMU_FQCSR_FQON) ||
> + !!(ctrl & (RISCV_IOMMU_FQCSR_FQOF | RISCV_IOMMU_FQCSR_FQMF))) {
> + return;
> + }
> +
> + if (head == next) {
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_FQCSR,
> + RISCV_IOMMU_FQCSR_FQOF, 0);
> + } else {
> + dma_addr_t addr = s->fq_addr + tail * sizeof(*ev);
> + if (dma_memory_write(s->target_as, addr, ev, sizeof(*ev),
> + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) {
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_FQCSR,
> + RISCV_IOMMU_FQCSR_FQMF, 0);
> + } else {
> + riscv_iommu_reg_set32(s, RISCV_IOMMU_REG_FQT, next);
> + }
> + }
> +
> + if (ctrl & RISCV_IOMMU_FQCSR_FIE) {
> + riscv_iommu_notify(s, RISCV_IOMMU_INTR_FQ);
> + }
> +}
> +
> +static void riscv_iommu_pri(RISCVIOMMUState *s,
> + struct riscv_iommu_pq_record *pr)
> +{
> + uint32_t ctrl = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_PQCSR);
> + uint32_t head = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_PQH) &
> s->pq_mask;
> + uint32_t tail = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_PQT) &
> s->pq_mask;
> + uint32_t next = (tail + 1) & s->pq_mask;
> + uint32_t devid = get_field(pr->hdr, RISCV_IOMMU_PREQ_HDR_DID);
> +
> + trace_riscv_iommu_pri(s->parent_obj.id, PCI_BUS_NUM(devid),
> PCI_SLOT(devid),
> + PCI_FUNC(devid), pr->payload);
> +
> + if (!(ctrl & RISCV_IOMMU_PQCSR_PQON) ||
> + !!(ctrl & (RISCV_IOMMU_PQCSR_PQOF | RISCV_IOMMU_PQCSR_PQMF))) {
> + return;
> + }
> +
> + if (head == next) {
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_PQCSR,
> + RISCV_IOMMU_PQCSR_PQOF, 0);
> + } else {
> + dma_addr_t addr = s->pq_addr + tail * sizeof(*pr);
> + if (dma_memory_write(s->target_as, addr, pr, sizeof(*pr),
> + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) {
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_PQCSR,
> + RISCV_IOMMU_PQCSR_PQMF, 0);
> + } else {
> + riscv_iommu_reg_set32(s, RISCV_IOMMU_REG_PQT, next);
> + }
> + }
> +
> + if (ctrl & RISCV_IOMMU_PQCSR_PIE) {
> + riscv_iommu_notify(s, RISCV_IOMMU_INTR_PQ);
> + }
> +}
> +
> +/* Portable implementation of pext_u64, bit-mask extraction. */
> +static uint64_t _pext_u64(uint64_t val, uint64_t ext)
> +{
> + uint64_t ret = 0;
> + uint64_t rot = 1;
> +
> + while (ext) {
> + if (ext & 1) {
> + if (val & 1) {
> + ret |= rot;
> + }
> + rot <<= 1;
> + }
> + val >>= 1;
> + ext >>= 1;
> + }
> +
> + return ret;
> +}
> +
> +/* Check if GPA matches MSI/MRIF pattern. */
> +static bool riscv_iommu_msi_check(RISCVIOMMUState *s, RISCVIOMMUContext *ctx,
> + dma_addr_t gpa)
> +{
> + if (!s->enable_msi) {
> + return false;
> + }
> +
> + if (get_field(ctx->msiptp, RISCV_IOMMU_DC_MSIPTP_MODE) !=
> + RISCV_IOMMU_DC_MSIPTP_MODE_FLAT) {
> + return false; /* Invalid MSI/MRIF mode */
> + }
> +
> + if ((PPN_DOWN(gpa) ^ ctx->msi_addr_pattern) & ~ctx->msi_addr_mask) {
> + return false; /* GPA not in MSI range defined by AIA IMSIC rules. */
> + }
> +
> + return true;
> +}
> +
> +/*
> + * RISCV IOMMU Address Translation Lookup - Page Table Walk
> + *
> + * Note: Code is based on get_physical_address() from
> target/riscv/cpu_helper.c
> + * Both implementation can be merged into single helper function in future.
> + * Keeping them separate for now, as error reporting and flow specifics are
> + * sufficiently different for separate implementation.
> + *
> + * @s : IOMMU Device State
> + * @ctx : Translation context for device id and process address space
> id.
> + * @iotlb : translation data: physical address and access mode.
> + * @return : success or fault cause code.
> + */
> +static int riscv_iommu_spa_fetch(RISCVIOMMUState *s, RISCVIOMMUContext *ctx,
> + IOMMUTLBEntry *iotlb)
> +{
> + dma_addr_t addr, base;
> + uint64_t satp, gatp, pte;
> + bool en_s, en_g;
> + struct {
> + unsigned char step;
> + unsigned char levels;
> + unsigned char ptidxbits;
> + unsigned char ptesize;
> + } sc[2];
> + /* Translation stage phase */
> + enum {
> + S_STAGE = 0,
> + G_STAGE = 1,
> + } pass;
> +
> + satp = get_field(ctx->satp, RISCV_IOMMU_ATP_MODE_FIELD);
> + gatp = get_field(ctx->gatp, RISCV_IOMMU_ATP_MODE_FIELD);
> +
> + en_s = satp != RISCV_IOMMU_DC_FSC_MODE_BARE;
> + en_g = gatp != RISCV_IOMMU_DC_IOHGATP_MODE_BARE;
> +
> + /* Early check for MSI address match when IOVA == GPA */
> + if ((iotlb->perm & IOMMU_WO) &&
> + riscv_iommu_msi_check(s, ctx, iotlb->iova)) {
> + iotlb->target_as = &s->trap_as;
> + iotlb->translated_addr = iotlb->iova;
> + iotlb->addr_mask = ~TARGET_PAGE_MASK;
> + return 0;
> + }
> +
> + /* Exit early for pass-through mode. */
> + if (!(en_s || en_g)) {
> + iotlb->translated_addr = iotlb->iova;
> + iotlb->addr_mask = ~TARGET_PAGE_MASK;
> + /* Allow R/W in pass-through mode */
> + iotlb->perm = IOMMU_RW;
> + return 0;
> + }
> +
> + /* S/G translation parameters. */
> + for (pass = 0; pass < 2; pass++) {
> + uint32_t sv_mode;
> +
> + sc[pass].step = 0;
> + if (pass ? (s->fctl & RISCV_IOMMU_FCTL_GXL) :
> + (ctx->tc & RISCV_IOMMU_DC_TC_SXL)) {
> + /* 32bit mode for GXL/SXL == 1 */
> + switch (pass ? gatp : satp) {
> + case RISCV_IOMMU_DC_IOHGATP_MODE_BARE:
> + sc[pass].levels = 0;
> + sc[pass].ptidxbits = 0;
> + sc[pass].ptesize = 0;
> + break;
> + case RISCV_IOMMU_DC_IOHGATP_MODE_SV32X4:
> + sv_mode = pass ? RISCV_IOMMU_CAP_SV32X4 :
> RISCV_IOMMU_CAP_SV32;
> + if (!(s->cap & sv_mode)) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> + sc[pass].levels = 2;
> + sc[pass].ptidxbits = 10;
> + sc[pass].ptesize = 4;
> + break;
> + default:
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> + } else {
> + /* 64bit mode for GXL/SXL == 0 */
> + switch (pass ? gatp : satp) {
> + case RISCV_IOMMU_DC_IOHGATP_MODE_BARE:
> + sc[pass].levels = 0;
> + sc[pass].ptidxbits = 0;
> + sc[pass].ptesize = 0;
> + break;
> + case RISCV_IOMMU_DC_IOHGATP_MODE_SV39X4:
> + sv_mode = pass ? RISCV_IOMMU_CAP_SV39X4 :
> RISCV_IOMMU_CAP_SV39;
> + if (!(s->cap & sv_mode)) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> + sc[pass].levels = 3;
> + sc[pass].ptidxbits = 9;
> + sc[pass].ptesize = 8;
> + break;
> + case RISCV_IOMMU_DC_IOHGATP_MODE_SV48X4:
> + sv_mode = pass ? RISCV_IOMMU_CAP_SV48X4 :
> RISCV_IOMMU_CAP_SV48;
> + if (!(s->cap & sv_mode)) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> + sc[pass].levels = 4;
> + sc[pass].ptidxbits = 9;
> + sc[pass].ptesize = 8;
> + break;
> + case RISCV_IOMMU_DC_IOHGATP_MODE_SV57X4:
> + sv_mode = pass ? RISCV_IOMMU_CAP_SV57X4 :
> RISCV_IOMMU_CAP_SV57;
> + if (!(s->cap & sv_mode)) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> + sc[pass].levels = 5;
> + sc[pass].ptidxbits = 9;
> + sc[pass].ptesize = 8;
> + break;
> + default:
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> + }
> + };
> +
> + /* S/G stages translation tables root pointers */
> + gatp = PPN_PHYS(get_field(ctx->gatp, RISCV_IOMMU_ATP_PPN_FIELD));
> + satp = PPN_PHYS(get_field(ctx->satp, RISCV_IOMMU_ATP_PPN_FIELD));
> + addr = (en_s && en_g) ? satp : iotlb->iova;
> + base = en_g ? gatp : satp;
> + pass = en_g ? G_STAGE : S_STAGE;
> +
> + do {
> + const unsigned widened = (pass && !sc[pass].step) ? 2 : 0;
> + const unsigned va_bits = widened + sc[pass].ptidxbits;
> + const unsigned va_skip = TARGET_PAGE_BITS + sc[pass].ptidxbits *
> + (sc[pass].levels - 1 - sc[pass].step);
> + const unsigned idx = (addr >> va_skip) & ((1 << va_bits) - 1);
> + const dma_addr_t pte_addr = base + idx * sc[pass].ptesize;
> + const bool ade =
> + ctx->tc & (pass ? RISCV_IOMMU_DC_TC_GADE :
> RISCV_IOMMU_DC_TC_SADE);
> +
> + /* Address range check before first level lookup */
> + if (!sc[pass].step) {
> + const uint64_t va_mask = (1ULL << (va_skip + va_bits)) - 1;
> + if ((addr & va_mask) != addr) {
> + return RISCV_IOMMU_FQ_CAUSE_DMA_DISABLED;
> + }
> + }
> +
> + /* Read page table entry */
> + if (dma_memory_read(s->target_as, pte_addr, &pte,
> + sc[pass].ptesize, MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) {
> + return (iotlb->perm & IOMMU_WO) ? RISCV_IOMMU_FQ_CAUSE_WR_FAULT
> + : RISCV_IOMMU_FQ_CAUSE_RD_FAULT;
> + }
> +
> + if (sc[pass].ptesize == 4) {
> + pte = (uint64_t) le32_to_cpu(*((uint32_t *)&pte));
> + } else {
> + pte = le64_to_cpu(pte);
> + }
> +
> + sc[pass].step++;
> + hwaddr ppn = pte >> PTE_PPN_SHIFT;
> +
> + if (!(pte & PTE_V)) {
> + break; /* Invalid PTE */
> + } else if (!(pte & (PTE_R | PTE_W | PTE_X))) {
> + base = PPN_PHYS(ppn); /* Inner PTE, continue walking */
> + } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) {
> + break; /* Reserved leaf PTE flags: PTE_W */
> + } else if ((pte & (PTE_R | PTE_W | PTE_X)) == (PTE_W | PTE_X)) {
> + break; /* Reserved leaf PTE flags: PTE_W + PTE_X
> */
> + } else if (ppn & ((1ULL << (va_skip - TARGET_PAGE_BITS)) - 1)) {
> + break; /* Misaligned PPN */
> + } else if ((iotlb->perm & IOMMU_RO) && !(pte & PTE_R)) {
> + break; /* Read access check failed */
> + } else if ((iotlb->perm & IOMMU_WO) && !(pte & PTE_W)) {
> + break; /* Write access check failed */
> + } else if ((iotlb->perm & IOMMU_RO) && !ade && !(pte & PTE_A)) {
> + break; /* Access bit not set */
> + } else if ((iotlb->perm & IOMMU_WO) && !ade && !(pte & PTE_D)) {
> + break; /* Dirty bit not set */
> + } else {
> + /* Leaf PTE, translation completed. */
> + sc[pass].step = sc[pass].levels;
> + base = PPN_PHYS(ppn) | (addr & ((1ULL << va_skip) - 1));
> + /* Update address mask based on smallest translation granularity
> */
> + iotlb->addr_mask &= (1ULL << va_skip) - 1;
> + /* Continue with S-Stage translation? */
> + if (pass && sc[0].step != sc[0].levels) {
> + pass = S_STAGE;
> + addr = iotlb->iova;
> + continue;
> + }
> + /* Translation phase completed (GPA or SPA) */
> + iotlb->translated_addr = base;
> + iotlb->perm = (pte & PTE_W) ? ((pte & PTE_R) ? IOMMU_RW :
> IOMMU_WO)
> + : IOMMU_RO;
> +
> + /* Check MSI GPA address match */
> + if (pass == S_STAGE && (iotlb->perm & IOMMU_WO) &&
> + riscv_iommu_msi_check(s, ctx, base)) {
> + /* Trap MSI writes and return GPA address. */
> + iotlb->target_as = &s->trap_as;
> + iotlb->addr_mask = ~TARGET_PAGE_MASK;
> + return 0;
> + }
> +
> + /* Continue with G-Stage translation? */
> + if (!pass && en_g) {
> + pass = G_STAGE;
> + addr = base;
> + base = gatp;
> + sc[pass].step = 0;
> + continue;
> + }
> +
> + return 0;
> + }
> +
> + if (sc[pass].step == sc[pass].levels) {
> + break; /* Can't find leaf PTE */
> + }
> +
> + /* Continue with G-Stage translation? */
> + if (!pass && en_g) {
> + pass = G_STAGE;
> + addr = base;
> + base = gatp;
> + sc[pass].step = 0;
> + }
> + } while (1);
> +
> + return (iotlb->perm & IOMMU_WO) ?
> + (pass ? RISCV_IOMMU_FQ_CAUSE_WR_FAULT_VS :
> + RISCV_IOMMU_FQ_CAUSE_WR_FAULT_S) :
> + (pass ? RISCV_IOMMU_FQ_CAUSE_RD_FAULT_VS :
> + RISCV_IOMMU_FQ_CAUSE_RD_FAULT_S);
> +}
> +
> +static void riscv_iommu_report_fault(RISCVIOMMUState *s,
> + RISCVIOMMUContext *ctx,
> + uint32_t fault_type, uint32_t cause,
> + bool pv,
> + uint64_t iotval, uint64_t iotval2)
> +{
> + struct riscv_iommu_fq_record ev = { 0 };
> +
> + if (ctx->tc & RISCV_IOMMU_DC_TC_DTF) {
> + switch (cause) {
> + case RISCV_IOMMU_FQ_CAUSE_DMA_DISABLED:
> + case RISCV_IOMMU_FQ_CAUSE_DDT_LOAD_FAULT:
> + case RISCV_IOMMU_FQ_CAUSE_DDT_INVALID:
> + case RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED:
> + case RISCV_IOMMU_FQ_CAUSE_DDT_CORRUPTED:
> + case RISCV_IOMMU_FQ_CAUSE_INTERNAL_DP_ERROR:
> + case RISCV_IOMMU_FQ_CAUSE_MSI_WR_FAULT:
> + break;
> + default:
> + /* DTF prevents reporting a fault for this given cause */
> + return;
> + }
> + }
> +
> + ev.hdr = set_field(ev.hdr, RISCV_IOMMU_FQ_HDR_CAUSE, cause);
> + ev.hdr = set_field(ev.hdr, RISCV_IOMMU_FQ_HDR_TTYPE, fault_type);
> + ev.hdr = set_field(ev.hdr, RISCV_IOMMU_FQ_HDR_DID, ctx->devid);
> + ev.hdr = set_field(ev.hdr, RISCV_IOMMU_FQ_HDR_PV, true);
> +
> + if (pv) {
> + ev.hdr = set_field(ev.hdr, RISCV_IOMMU_FQ_HDR_PID, ctx->process_id);
> + }
> +
> + ev.iotval = iotval;
> + ev.iotval2 = iotval2;
> +
> + riscv_iommu_fault(s, &ev);
> +}
> +
> +/* Redirect MSI write for given GPA. */
> +static MemTxResult riscv_iommu_msi_write(RISCVIOMMUState *s,
> + RISCVIOMMUContext *ctx, uint64_t gpa, uint64_t data,
> + unsigned size, MemTxAttrs attrs)
> +{
> + MemTxResult res;
> + dma_addr_t addr;
> + uint64_t intn;
> + uint32_t n190;
> + uint64_t pte[2];
> + int fault_type = RISCV_IOMMU_FQ_TTYPE_UADDR_WR;
> + int cause;
> +
> + /* Interrupt File Number */
> + intn = _pext_u64(PPN_DOWN(gpa), ctx->msi_addr_mask);
> + if (intn >= 256) {
> + /* Interrupt file number out of range */
> + res = MEMTX_ACCESS_ERROR;
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_LOAD_FAULT;
> + goto err;
> + }
> +
> + /* fetch MSI PTE */
> + addr = PPN_PHYS(get_field(ctx->msiptp, RISCV_IOMMU_DC_MSIPTP_PPN));
> + addr = addr | (intn * sizeof(pte));
> + res = dma_memory_read(s->target_as, addr, &pte, sizeof(pte),
> + MEMTXATTRS_UNSPECIFIED);
> + if (res != MEMTX_OK) {
> + if (res == MEMTX_DECODE_ERROR) {
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_PT_CORRUPTED;
> + } else {
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_LOAD_FAULT;
> + }
> + goto err;
> + }
> +
> + le64_to_cpus(&pte[0]);
> + le64_to_cpus(&pte[1]);
> +
> + if (!(pte[0] & RISCV_IOMMU_MSI_PTE_V) || (pte[0] &
> RISCV_IOMMU_MSI_PTE_C)) {
> + /*
> + * The spec mentions that: "If msipte.C == 1, then further
> + * processing to interpret the PTE is implementation
> + * defined.". We'll abort with cause = 262 for this
> + * case too.
> + */
> + res = MEMTX_ACCESS_ERROR;
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_INVALID;
> + goto err;
> + }
> +
> + switch (get_field(pte[0], RISCV_IOMMU_MSI_PTE_M)) {
> + case RISCV_IOMMU_MSI_PTE_M_BASIC:
> + /* MSI Pass-through mode */
> + addr = PPN_PHYS(get_field(pte[0], RISCV_IOMMU_MSI_PTE_PPN));
> + addr = addr | (gpa & TARGET_PAGE_MASK);
> +
> + trace_riscv_iommu_msi(s->parent_obj.id, PCI_BUS_NUM(ctx->devid),
> + PCI_SLOT(ctx->devid), PCI_FUNC(ctx->devid),
> + gpa, addr);
> +
> + res = dma_memory_write(s->target_as, addr, &data, size, attrs);
> + if (res != MEMTX_OK) {
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_WR_FAULT;
> + goto err;
> + }
> +
> + return MEMTX_OK;
> + case RISCV_IOMMU_MSI_PTE_M_MRIF:
> + /* MRIF mode, continue. */
> + break;
> + default:
> + res = MEMTX_ACCESS_ERROR;
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_MISCONFIGURED;
> + goto err;
> + }
> +
> + /*
> + * Report an error for interrupt identities exceeding the maximum allowed
> + * for an IMSIC interrupt file (2047) or destination address is not
> 32-bit
> + * aligned. See IOMMU Specification, Chapter 2.3. MSI page tables.
> + */
> + if ((data > 2047) || (gpa & 3)) {
> + res = MEMTX_ACCESS_ERROR;
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_MISCONFIGURED;
> + goto err;
> + }
> +
> + /* MSI MRIF mode, non atomic pending bit update */
> +
> + /* MRIF pending bit address */
> + addr = get_field(pte[0], RISCV_IOMMU_MSI_PTE_MRIF_ADDR) << 9;
> + addr = addr | ((data & 0x7c0) >> 3);
> +
> + trace_riscv_iommu_msi(s->parent_obj.id, PCI_BUS_NUM(ctx->devid),
> + PCI_SLOT(ctx->devid), PCI_FUNC(ctx->devid),
> + gpa, addr);
> +
> + /* MRIF pending bit mask */
> + data = 1ULL << (data & 0x03f);
> + res = dma_memory_read(s->target_as, addr, &intn, sizeof(intn), attrs);
> + if (res != MEMTX_OK) {
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_LOAD_FAULT;
> + goto err;
> + }
> +
> + intn = intn | data;
> + res = dma_memory_write(s->target_as, addr, &intn, sizeof(intn), attrs);
> + if (res != MEMTX_OK) {
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_WR_FAULT;
> + goto err;
> + }
> +
> + /* Get MRIF enable bits */
> + addr = addr + sizeof(intn);
> + res = dma_memory_read(s->target_as, addr, &intn, sizeof(intn), attrs);
> + if (res != MEMTX_OK) {
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_LOAD_FAULT;
> + goto err;
> + }
> +
> + if (!(intn & data)) {
> + /* notification disabled, MRIF update completed. */
> + return MEMTX_OK;
> + }
> +
> + /* Send notification message */
> + addr = PPN_PHYS(get_field(pte[1], RISCV_IOMMU_MSI_MRIF_NPPN));
> + n190 = get_field(pte[1], RISCV_IOMMU_MSI_MRIF_NID) |
> + (get_field(pte[1], RISCV_IOMMU_MSI_MRIF_NID_MSB) << 10);
> +
> + res = dma_memory_write(s->target_as, addr, &n190, sizeof(n190), attrs);
> + if (res != MEMTX_OK) {
> + cause = RISCV_IOMMU_FQ_CAUSE_MSI_WR_FAULT;
> + goto err;
> + }
> +
> + trace_riscv_iommu_mrif_notification(s->parent_obj.id, n190, addr);
> +
> + return MEMTX_OK;
> +
> +err:
> + riscv_iommu_report_fault(s, ctx, fault_type, cause,
> + !!ctx->process_id, 0, 0);
> + return res;
> +}
> +
> +/*
> + * Check device context configuration as described by the
> + * riscv-iommu spec section "Device-context configuration
> + * checks".
> + */
> +static bool riscv_iommu_validate_device_ctx(RISCVIOMMUState *s,
> + RISCVIOMMUContext *ctx)
> +{
> + uint32_t fsc_mode, msi_mode;
> +
> + if (!(ctx->tc & RISCV_IOMMU_DC_TC_EN_PRI) &&
> + ctx->tc & RISCV_IOMMU_DC_TC_PRPR) {
> + return false;
> + }
> +
> + if (!(s->cap & RISCV_IOMMU_CAP_T2GPA) &&
> + ctx->tc & RISCV_IOMMU_DC_TC_T2GPA) {
> + return false;
> + }
> +
> + if (s->cap & RISCV_IOMMU_CAP_MSI_FLAT) {
> + msi_mode = get_field(ctx->msiptp, RISCV_IOMMU_DC_MSIPTP_MODE);
> +
> + if (msi_mode != RISCV_IOMMU_DC_MSIPTP_MODE_OFF &&
> + msi_mode != RISCV_IOMMU_DC_MSIPTP_MODE_FLAT) {
> + return false;
> + }
> + }
> +
> + fsc_mode = get_field(ctx->satp, RISCV_IOMMU_DC_FSC_MODE);
> +
> + if (ctx->tc & RISCV_IOMMU_DC_TC_PDTV) {
> + switch (fsc_mode) {
> + case RISCV_IOMMU_DC_FSC_PDTP_MODE_PD8:
> + if (!(s->cap & RISCV_IOMMU_CAP_PD8)) {
> + return false;
> + }
> + break;
> + case RISCV_IOMMU_DC_FSC_PDTP_MODE_PD17:
> + if (!(s->cap & RISCV_IOMMU_CAP_PD17)) {
> + return false;
> + }
> + break;
> + case RISCV_IOMMU_DC_FSC_PDTP_MODE_PD20:
> + if (!(s->cap & RISCV_IOMMU_CAP_PD20)) {
> + return false;
> + }
> + break;
> + }
> + } else {
> + /* DC.tc.PDTV is 0 */
> + if (ctx->tc & RISCV_IOMMU_DC_TC_DPE) {
> + return false;
> + }
> +
> + if (ctx->tc & RISCV_IOMMU_DC_TC_SXL) {
> + if (fsc_mode == RISCV_IOMMU_CAP_SV32 &&
> + !(s->cap & RISCV_IOMMU_CAP_SV32)) {
> + return false;
> + }
> + } else {
> + switch (fsc_mode) {
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV39:
> + if (!(s->cap & RISCV_IOMMU_CAP_SV39)) {
> + return false;
> + }
> + break;
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV48:
> + if (!(s->cap & RISCV_IOMMU_CAP_SV48)) {
> + return false;
> + }
> + break;
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV57:
> + if (!(s->cap & RISCV_IOMMU_CAP_SV57)) {
> + return false;
> + }
> + break;
> + }
> + }
> + }
> +
> + /*
> + * CAP_END is always zero (only one endianess). FCTL_BE is
> + * always zero (little-endian accesses). Thus TC_SBE must
> + * always be LE, i.e. zero.
> + */
> + if (ctx->tc & RISCV_IOMMU_DC_TC_SBE) {
> + return false;
> + }
> +
> + return true;
> +}
> +
> +/*
> + * Validate process context (PC) according to section
> + * "Process-context configuration checks".
> + */
> +static bool riscv_iommu_validate_process_ctx(RISCVIOMMUState *s,
> + RISCVIOMMUContext *ctx)
> +{
> + uint32_t mode;
> +
> + if (get_field(ctx->ta, RISCV_IOMMU_PC_TA_RESERVED)) {
> + return false;
> + }
> +
> + if (get_field(ctx->satp, RISCV_IOMMU_PC_FSC_RESERVED)) {
> + return false;
> + }
> +
> + mode = get_field(ctx->satp, RISCV_IOMMU_DC_FSC_MODE);
> + switch (mode) {
> + case RISCV_IOMMU_DC_FSC_MODE_BARE:
> + /* sv39 and sv32 modes have the same value (8) */
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV39:
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV48:
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV57:
> + break;
> + default:
> + return false;
> + }
> +
> + if (ctx->tc & RISCV_IOMMU_DC_TC_SXL) {
> + if (mode == RISCV_IOMMU_CAP_SV32 &&
> + !(s->cap & RISCV_IOMMU_CAP_SV32)) {
> + return false;
> + }
> + } else {
> + switch (mode) {
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV39:
> + if (!(s->cap & RISCV_IOMMU_CAP_SV39)) {
> + return false;
> + }
> + break;
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV48:
> + if (!(s->cap & RISCV_IOMMU_CAP_SV48)) {
> + return false;
> + }
> + break;
> + case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV57:
> + if (!(s->cap & RISCV_IOMMU_CAP_SV57)) {
> + return false;
> + }
> + break;
> + }
> + }
> +
> + return true;
> +}
> +
> +/*
> + * RISC-V IOMMU Device Context Loopkup - Device Directory Tree Walk
> + *
> + * @s : IOMMU Device State
> + * @ctx : Device Translation Context with devid and process_id set.
> + * @return : success or fault code.
> + */
> +static int riscv_iommu_ctx_fetch(RISCVIOMMUState *s, RISCVIOMMUContext *ctx)
> +{
> + const uint64_t ddtp = s->ddtp;
> + unsigned mode = get_field(ddtp, RISCV_IOMMU_DDTP_MODE);
> + dma_addr_t addr = PPN_PHYS(get_field(ddtp, RISCV_IOMMU_DDTP_PPN));
> + struct riscv_iommu_dc dc;
> + /* Device Context format: 0: extended (64 bytes) | 1: base (32 bytes) */
> + const int dc_fmt = !s->enable_msi;
> + const size_t dc_len = sizeof(dc) >> dc_fmt;
> + unsigned depth;
> + uint64_t de;
> +
> + switch (mode) {
> + case RISCV_IOMMU_DDTP_MODE_OFF:
> + return RISCV_IOMMU_FQ_CAUSE_DMA_DISABLED;
> +
> + case RISCV_IOMMU_DDTP_MODE_BARE:
> + /* mock up pass-through translation context */
> + ctx->gatp = set_field(0, RISCV_IOMMU_ATP_MODE_FIELD,
> + RISCV_IOMMU_DC_IOHGATP_MODE_BARE);
> + ctx->satp = set_field(0, RISCV_IOMMU_ATP_MODE_FIELD,
> + RISCV_IOMMU_DC_FSC_MODE_BARE);
> + ctx->tc = RISCV_IOMMU_DC_TC_V;
> + ctx->ta = 0;
> + ctx->msiptp = 0;
> + return 0;
> +
> + case RISCV_IOMMU_DDTP_MODE_1LVL:
> + depth = 0;
> + break;
> +
> + case RISCV_IOMMU_DDTP_MODE_2LVL:
> + depth = 1;
> + break;
> +
> + case RISCV_IOMMU_DDTP_MODE_3LVL:
> + depth = 2;
> + break;
> +
> + default:
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> +
> + /*
> + * Check supported device id width (in bits).
> + * See IOMMU Specification, Chapter 6. Software guidelines.
> + * - if extended device-context format is used:
> + * 1LVL: 6, 2LVL: 15, 3LVL: 24
> + * - if base device-context format is used:
> + * 1LVL: 7, 2LVL: 16, 3LVL: 24
> + */
> + if (ctx->devid >= (1 << (depth * 9 + 6 + (dc_fmt && depth != 2)))) {
> + return RISCV_IOMMU_FQ_CAUSE_TTYPE_BLOCKED;
> + }
> +
> + /* Device directory tree walk */
> + for (; depth-- > 0; ) {
> + /*
> + * Select device id index bits based on device directory tree level
> + * and device context format.
> + * See IOMMU Specification, Chapter 2. Data Structures.
> + * - if extended device-context format is used:
> + * device index: [23:15][14:6][5:0]
> + * - if base device-context format is used:
> + * device index: [23:16][15:7][6:0]
> + */
> + const int split = depth * 9 + 6 + dc_fmt;
> + addr |= ((ctx->devid >> split) << 3) & ~TARGET_PAGE_MASK;
> + if (dma_memory_read(s->target_as, addr, &de, sizeof(de),
> + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_LOAD_FAULT;
> + }
> + le64_to_cpus(&de);
> + if (!(de & RISCV_IOMMU_DDTE_VALID)) {
> + /* invalid directory entry */
> + return RISCV_IOMMU_FQ_CAUSE_DDT_INVALID;
> + }
> + if (de & ~(RISCV_IOMMU_DDTE_PPN | RISCV_IOMMU_DDTE_VALID)) {
> + /* reserved bits set */
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> + addr = PPN_PHYS(get_field(de, RISCV_IOMMU_DDTE_PPN));
> + }
> +
> + /* index into device context entry page */
> + addr |= (ctx->devid * dc_len) & ~TARGET_PAGE_MASK;
> +
> + memset(&dc, 0, sizeof(dc));
> + if (dma_memory_read(s->target_as, addr, &dc, dc_len,
> + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_LOAD_FAULT;
> + }
> +
> + /* Set translation context. */
> + ctx->tc = le64_to_cpu(dc.tc);
> + ctx->gatp = le64_to_cpu(dc.iohgatp);
> + ctx->satp = le64_to_cpu(dc.fsc);
> + ctx->ta = le64_to_cpu(dc.ta);
> + ctx->msiptp = le64_to_cpu(dc.msiptp);
> + ctx->msi_addr_mask = le64_to_cpu(dc.msi_addr_mask);
> + ctx->msi_addr_pattern = le64_to_cpu(dc.msi_addr_pattern);
> +
> + if (!(ctx->tc & RISCV_IOMMU_DC_TC_V)) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_INVALID;
> + }
> +
> + if (!riscv_iommu_validate_device_ctx(s, ctx)) {
> + return RISCV_IOMMU_FQ_CAUSE_DDT_MISCONFIGURED;
> + }
> +
> + /* FSC field checks */
> + mode = get_field(ctx->satp, RISCV_IOMMU_DC_FSC_MODE);
> + addr = PPN_PHYS(get_field(ctx->satp, RISCV_IOMMU_DC_FSC_PPN));
> +
> + if (!(ctx->tc & RISCV_IOMMU_DC_TC_PDTV)) {
> + if (ctx->process_id != RISCV_IOMMU_NOPROCID) {
> + /* PID is disabled */
> + return RISCV_IOMMU_FQ_CAUSE_TTYPE_BLOCKED;
> + }
> + if (mode > RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV57) {
> + /* Invalid translation mode */
> + return RISCV_IOMMU_FQ_CAUSE_DDT_INVALID;
> + }
> + return 0;
> + }
> +
> + if (ctx->process_id == RISCV_IOMMU_NOPROCID) {
> + if (!(ctx->tc & RISCV_IOMMU_DC_TC_DPE)) {
> + /* No default process_id enabled, set BARE mode */
> + ctx->satp = 0ULL;
> + return 0;
> + } else {
> + /* Use default process_id #0 */
> + ctx->process_id = 0;
> + }
> + }
> +
> + if (mode == RISCV_IOMMU_DC_FSC_MODE_BARE) {
> + /* No S-Stage translation, done. */
> + return 0;
> + }
> +
> + /* FSC.TC.PDTV enabled */
> + if (mode > RISCV_IOMMU_DC_FSC_PDTP_MODE_PD20) {
> + /* Invalid PDTP.MODE */
> + return RISCV_IOMMU_FQ_CAUSE_PDT_MISCONFIGURED;
> + }
> +
> + for (depth = mode - RISCV_IOMMU_DC_FSC_PDTP_MODE_PD8; depth-- > 0; ) {
> + /*
> + * Select process id index bits based on process directory tree
> + * level. See IOMMU Specification, 2.2. Process-Directory-Table.
> + */
> + const int split = depth * 9 + 8;
> + addr |= ((ctx->process_id >> split) << 3) & ~TARGET_PAGE_MASK;
> + if (dma_memory_read(s->target_as, addr, &de, sizeof(de),
> + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) {
> + return RISCV_IOMMU_FQ_CAUSE_PDT_LOAD_FAULT;
> + }
> + le64_to_cpus(&de);
> + if (!(de & RISCV_IOMMU_PC_TA_V)) {
> + return RISCV_IOMMU_FQ_CAUSE_PDT_INVALID;
> + }
> + addr = PPN_PHYS(get_field(de, RISCV_IOMMU_PC_FSC_PPN));
> + }
> +
> + /* Leaf entry in PDT */
> + addr |= (ctx->process_id << 4) & ~TARGET_PAGE_MASK;
> + if (dma_memory_read(s->target_as, addr, &dc.ta, sizeof(uint64_t) * 2,
> + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) {
> + return RISCV_IOMMU_FQ_CAUSE_PDT_LOAD_FAULT;
> + }
> +
> + /* Use FSC and TA from process directory entry. */
> + ctx->ta = le64_to_cpu(dc.ta);
> + ctx->satp = le64_to_cpu(dc.fsc);
> +
> + if (!(ctx->ta & RISCV_IOMMU_PC_TA_V)) {
> + return RISCV_IOMMU_FQ_CAUSE_PDT_INVALID;
> + }
> +
> + if (!riscv_iommu_validate_process_ctx(s, ctx)) {
> + return RISCV_IOMMU_FQ_CAUSE_PDT_MISCONFIGURED;
> + }
> +
> + return 0;
> +}
> +
> +/* Translation Context cache support */
> +static gboolean __ctx_equal(gconstpointer v1, gconstpointer v2)
> +{
> + RISCVIOMMUContext *c1 = (RISCVIOMMUContext *) v1;
> + RISCVIOMMUContext *c2 = (RISCVIOMMUContext *) v2;
> + return c1->devid == c2->devid &&
> + c1->process_id == c2->process_id;
> +}
> +
> +static guint __ctx_hash(gconstpointer v)
> +{
> + RISCVIOMMUContext *ctx = (RISCVIOMMUContext *) v;
> + /*
> + * Generate simple hash of (process_id, devid)
> + * assuming 24-bit wide devid.
> + */
> + return (guint)(ctx->devid) + ((guint)(ctx->process_id) << 24);
> +}
> +
> +static void __ctx_inval_devid_procid(gpointer key, gpointer value,
> + gpointer data)
> +{
> + RISCVIOMMUContext *ctx = (RISCVIOMMUContext *) value;
> + RISCVIOMMUContext *arg = (RISCVIOMMUContext *) data;
> + if (ctx->tc & RISCV_IOMMU_DC_TC_V &&
> + ctx->devid == arg->devid &&
> + ctx->process_id == arg->process_id) {
> + ctx->tc &= ~RISCV_IOMMU_DC_TC_V;
> + }
> +}
> +
> +static void __ctx_inval_devid(gpointer key, gpointer value, gpointer data)
> +{
> + RISCVIOMMUContext *ctx = (RISCVIOMMUContext *) value;
> + RISCVIOMMUContext *arg = (RISCVIOMMUContext *) data;
> + if (ctx->tc & RISCV_IOMMU_DC_TC_V &&
> + ctx->devid == arg->devid) {
> + ctx->tc &= ~RISCV_IOMMU_DC_TC_V;
> + }
> +}
> +
> +static void __ctx_inval_all(gpointer key, gpointer value, gpointer data)
> +{
> + RISCVIOMMUContext *ctx = (RISCVIOMMUContext *) value;
> + if (ctx->tc & RISCV_IOMMU_DC_TC_V) {
> + ctx->tc &= ~RISCV_IOMMU_DC_TC_V;
> + }
> +}
> +
> +static void riscv_iommu_ctx_inval(RISCVIOMMUState *s, GHFunc func,
> + uint32_t devid, uint32_t process_id)
> +{
> + GHashTable *ctx_cache;
> + RISCVIOMMUContext key = {
> + .devid = devid,
> + .process_id = process_id,
> + };
> + ctx_cache = g_hash_table_ref(s->ctx_cache);
> + qemu_mutex_lock(&s->ctx_lock);
> + g_hash_table_foreach(ctx_cache, func, &key);
> + qemu_mutex_unlock(&s->ctx_lock);
> + g_hash_table_unref(ctx_cache);
> +}
> +
> +/* Find or allocate translation context for a given {device_id, process_id}
> */
> +static RISCVIOMMUContext *riscv_iommu_ctx(RISCVIOMMUState *s,
> + unsigned devid, unsigned
> process_id,
> + void **ref)
> +{
> + GHashTable *ctx_cache;
> + RISCVIOMMUContext *ctx;
> + RISCVIOMMUContext key = {
> + .devid = devid,
> + .process_id = process_id,
> + };
> +
> + ctx_cache = g_hash_table_ref(s->ctx_cache);
> + qemu_mutex_lock(&s->ctx_lock);
> + ctx = g_hash_table_lookup(ctx_cache, &key);
> + qemu_mutex_unlock(&s->ctx_lock);
> +
> + if (ctx && (ctx->tc & RISCV_IOMMU_DC_TC_V)) {
> + *ref = ctx_cache;
> + return ctx;
> + }
> +
> + ctx = g_new0(RISCVIOMMUContext, 1);
> + ctx->devid = devid;
> + ctx->process_id = process_id;
> +
> + int fault = riscv_iommu_ctx_fetch(s, ctx);
> + if (!fault) {
> + qemu_mutex_lock(&s->ctx_lock);
> + if (g_hash_table_size(ctx_cache) >= LIMIT_CACHE_CTX) {
> + g_hash_table_unref(ctx_cache);
> + ctx_cache = g_hash_table_new_full(__ctx_hash, __ctx_equal,
> + g_free, NULL);
> + g_hash_table_ref(ctx_cache);
> + g_hash_table_unref(qatomic_xchg(&s->ctx_cache, ctx_cache));
> + }
> + g_hash_table_add(ctx_cache, ctx);
> + qemu_mutex_unlock(&s->ctx_lock);
> + *ref = ctx_cache;
> + return ctx;
> + }
> +
> + g_hash_table_unref(ctx_cache);
> + *ref = NULL;
> +
> + riscv_iommu_report_fault(s, ctx, RISCV_IOMMU_FQ_TTYPE_UADDR_RD,
> + fault, !!process_id, 0, 0);
> +
> + g_free(ctx);
> + return NULL;
> +}
> +
> +static void riscv_iommu_ctx_put(RISCVIOMMUState *s, void *ref)
> +{
> + if (ref) {
> + g_hash_table_unref((GHashTable *)ref);
> + }
> +}
> +
> +/* Find or allocate address space for a given device */
> +static AddressSpace *riscv_iommu_space(RISCVIOMMUState *s, uint32_t devid)
> +{
> + RISCVIOMMUSpace *as;
> +
> + /* FIXME: PCIe bus remapping for attached endpoints. */
> + devid |= s->bus << 8;
> +
> + qemu_mutex_lock(&s->core_lock);
> + QLIST_FOREACH(as, &s->spaces, list) {
> + if (as->devid == devid) {
> + break;
> + }
> + }
> + qemu_mutex_unlock(&s->core_lock);
> +
> + if (as == NULL) {
> + char name[64];
> + as = g_new0(RISCVIOMMUSpace, 1);
> +
> + as->iommu = s;
> + as->devid = devid;
> +
> + snprintf(name, sizeof(name), "riscv-iommu-%04x:%02x.%d-iova",
> + PCI_BUS_NUM(as->devid), PCI_SLOT(as->devid),
> PCI_FUNC(as->devid));
> +
> + /* IOVA address space, untranslated addresses */
> + memory_region_init_iommu(&as->iova_mr, sizeof(as->iova_mr),
> + TYPE_RISCV_IOMMU_MEMORY_REGION,
> + OBJECT(as), "riscv_iommu", UINT64_MAX);
> + address_space_init(&as->iova_as, MEMORY_REGION(&as->iova_mr), name);
> +
> + qemu_mutex_lock(&s->core_lock);
> + QLIST_INSERT_HEAD(&s->spaces, as, list);
> + qemu_mutex_unlock(&s->core_lock);
> +
> + trace_riscv_iommu_new(s->parent_obj.id, PCI_BUS_NUM(as->devid),
> + PCI_SLOT(as->devid), PCI_FUNC(as->devid));
> + }
> + return &as->iova_as;
> +}
> +
> +static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx,
> + IOMMUTLBEntry *iotlb)
> +{
> + bool enable_pid;
> + bool enable_pri;
> + int fault;
> +
> + /*
> + * TC[32] is reserved for custom extensions, used here to temporarily
> + * enable automatic page-request generation for ATS queries.
> + */
> + enable_pri = (iotlb->perm == IOMMU_NONE) && (ctx->tc & BIT_ULL(32));
> + enable_pid = (ctx->tc & RISCV_IOMMU_DC_TC_PDTV);
> +
> + /* Translate using device directory / page table information. */
> + fault = riscv_iommu_spa_fetch(s, ctx, iotlb);
> +
> + if (enable_pri && fault) {
> + struct riscv_iommu_pq_record pr = {0};
> + if (enable_pid) {
> + pr.hdr = set_field(RISCV_IOMMU_PREQ_HDR_PV,
> + RISCV_IOMMU_PREQ_HDR_PID, ctx->process_id);
> + }
> + pr.hdr = set_field(pr.hdr, RISCV_IOMMU_PREQ_HDR_DID, ctx->devid);
> + pr.payload = (iotlb->iova & TARGET_PAGE_MASK) |
> + RISCV_IOMMU_PREQ_PAYLOAD_M;
> + riscv_iommu_pri(s, &pr);
> + return fault;
> + }
> +
> + if (fault) {
> + unsigned ttype;
> +
> + if (iotlb->perm & IOMMU_RW) {
> + ttype = RISCV_IOMMU_FQ_TTYPE_UADDR_WR;
> + } else {
> + ttype = RISCV_IOMMU_FQ_TTYPE_UADDR_RD;
> + }
> +
> + riscv_iommu_report_fault(s, ctx, ttype, fault, enable_pid,
> + iotlb->iova, iotlb->translated_addr);
> + return fault;
> + }
> +
> + return 0;
> +}
> +
> +/* IOMMU Command Interface */
> +static MemTxResult riscv_iommu_iofence(RISCVIOMMUState *s, bool notify,
> + uint64_t addr, uint32_t data)
> +{
> + /*
> + * ATS processing in this implementation of the IOMMU is synchronous,
> + * no need to wait for completions here.
> + */
> + if (!notify) {
> + return MEMTX_OK;
> + }
> +
> + return dma_memory_write(s->target_as, addr, &data, sizeof(data),
> + MEMTXATTRS_UNSPECIFIED);
> +}
> +
> +static void riscv_iommu_process_ddtp(RISCVIOMMUState *s)
> +{
> + uint64_t old_ddtp = s->ddtp;
> + uint64_t new_ddtp = riscv_iommu_reg_get64(s, RISCV_IOMMU_REG_DDTP);
> + unsigned new_mode = get_field(new_ddtp, RISCV_IOMMU_DDTP_MODE);
> + unsigned old_mode = get_field(old_ddtp, RISCV_IOMMU_DDTP_MODE);
> + bool ok = false;
> +
> + /*
> + * Check for allowed DDTP.MODE transitions:
> + * {OFF, BARE} -> {OFF, BARE, 1LVL, 2LVL, 3LVL}
> + * {1LVL, 2LVL, 3LVL} -> {OFF, BARE}
> + */
> + if (new_mode == old_mode ||
> + new_mode == RISCV_IOMMU_DDTP_MODE_OFF ||
> + new_mode == RISCV_IOMMU_DDTP_MODE_BARE) {
> + ok = true;
> + } else if (new_mode == RISCV_IOMMU_DDTP_MODE_1LVL ||
> + new_mode == RISCV_IOMMU_DDTP_MODE_2LVL ||
> + new_mode == RISCV_IOMMU_DDTP_MODE_3LVL) {
> + ok = old_mode == RISCV_IOMMU_DDTP_MODE_OFF ||
> + old_mode == RISCV_IOMMU_DDTP_MODE_BARE;
> + }
> +
> + if (ok) {
> + /* clear reserved and busy bits, report back sanitized version */
> + new_ddtp = set_field(new_ddtp & RISCV_IOMMU_DDTP_PPN,
> + RISCV_IOMMU_DDTP_MODE, new_mode);
> + } else {
> + new_ddtp = old_ddtp;
> + }
> + s->ddtp = new_ddtp;
> +
> + riscv_iommu_reg_set64(s, RISCV_IOMMU_REG_DDTP, new_ddtp);
> +}
> +
> +/* Command function and opcode field. */
> +#define RISCV_IOMMU_CMD(func, op) (((func) << 7) | (op))
> +
> +static void riscv_iommu_process_cq_tail(RISCVIOMMUState *s)
> +{
> + struct riscv_iommu_command cmd;
> + MemTxResult res;
> + dma_addr_t addr;
> + uint32_t tail, head, ctrl;
> + uint64_t cmd_opcode;
> + GHFunc func;
> +
> + ctrl = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_CQCSR);
> + tail = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_CQT) & s->cq_mask;
> + head = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_CQH) & s->cq_mask;
> +
> + /* Check for pending error or queue processing disabled */
> + if (!(ctrl & RISCV_IOMMU_CQCSR_CQON) ||
> + !!(ctrl & (RISCV_IOMMU_CQCSR_CMD_ILL | RISCV_IOMMU_CQCSR_CQMF))) {
> + return;
> + }
> +
> + while (tail != head) {
> + addr = s->cq_addr + head * sizeof(cmd);
> + res = dma_memory_read(s->target_as, addr, &cmd, sizeof(cmd),
> + MEMTXATTRS_UNSPECIFIED);
> +
> + if (res != MEMTX_OK) {
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_CQCSR,
> + RISCV_IOMMU_CQCSR_CQMF, 0);
> + goto fault;
> + }
> +
> + trace_riscv_iommu_cmd(s->parent_obj.id, cmd.dword0, cmd.dword1);
> +
> + cmd_opcode = get_field(cmd.dword0,
> + RISCV_IOMMU_CMD_OPCODE |
> RISCV_IOMMU_CMD_FUNC);
> +
> + switch (cmd_opcode) {
> + case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOFENCE_FUNC_C,
> + RISCV_IOMMU_CMD_IOFENCE_OPCODE):
> + res = riscv_iommu_iofence(s,
> + cmd.dword0 & RISCV_IOMMU_CMD_IOFENCE_AV, cmd.dword1,
> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOFENCE_DATA));
> +
> + if (res != MEMTX_OK) {
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_CQCSR,
> + RISCV_IOMMU_CQCSR_CQMF, 0);
> + goto fault;
> + }
> + break;
> +
> + case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_GVMA,
> + RISCV_IOMMU_CMD_IOTINVAL_OPCODE):
> + if (cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV) {
> + /* illegal command arguments IOTINVAL.GVMA & PSCV == 1 */
> + goto cmd_ill;
> + }
> + /* translation cache not implemented yet */
> + break;
> +
> + case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA,
> + RISCV_IOMMU_CMD_IOTINVAL_OPCODE):
> + /* translation cache not implemented yet */
> + break;
> +
> + case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT,
> + RISCV_IOMMU_CMD_IODIR_OPCODE):
> + if (!(cmd.dword0 & RISCV_IOMMU_CMD_IODIR_DV)) {
> + /* invalidate all device context cache mappings */
> + func = __ctx_inval_all;
> + } else {
> + /* invalidate all device context matching DID */
> + func = __ctx_inval_devid;
> + }
> + riscv_iommu_ctx_inval(s, func,
> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IODIR_DID), 0);
> + break;
> +
> + case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_PDT,
> + RISCV_IOMMU_CMD_IODIR_OPCODE):
> + if (!(cmd.dword0 & RISCV_IOMMU_CMD_IODIR_DV)) {
> + /* illegal command arguments IODIR_PDT & DV == 0 */
> + goto cmd_ill;
> + } else {
> + func = __ctx_inval_devid_procid;
> + }
> + riscv_iommu_ctx_inval(s, func,
> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IODIR_DID),
> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IODIR_PID));
> + break;
> +
> + default:
> + cmd_ill:
> + /* Invalid instruction, do not advance instruction index. */
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_CQCSR,
> + RISCV_IOMMU_CQCSR_CMD_ILL, 0);
> + goto fault;
> + }
> +
> + /* Advance and update head pointer after command completes. */
> + head = (head + 1) & s->cq_mask;
> + riscv_iommu_reg_set32(s, RISCV_IOMMU_REG_CQH, head);
> + }
> + return;
> +
> +fault:
> + if (ctrl & RISCV_IOMMU_CQCSR_CIE) {
> + riscv_iommu_notify(s, RISCV_IOMMU_INTR_CQ);
> + }
> +}
> +
> +static void riscv_iommu_process_cq_control(RISCVIOMMUState *s)
> +{
> + uint64_t base;
> + uint32_t ctrl_set = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_CQCSR);
> + uint32_t ctrl_clr;
> + bool enable = !!(ctrl_set & RISCV_IOMMU_CQCSR_CQEN);
> + bool active = !!(ctrl_set & RISCV_IOMMU_CQCSR_CQON);
> +
> + if (enable && !active) {
> + base = riscv_iommu_reg_get64(s, RISCV_IOMMU_REG_CQB);
> + s->cq_mask = (2ULL << get_field(base, RISCV_IOMMU_CQB_LOG2SZ)) - 1;
> + s->cq_addr = PPN_PHYS(get_field(base, RISCV_IOMMU_CQB_PPN));
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_CQT], ~s->cq_mask);
> + stl_le_p(&s->regs_rw[RISCV_IOMMU_REG_CQH], 0);
> + stl_le_p(&s->regs_rw[RISCV_IOMMU_REG_CQT], 0);
> + ctrl_set = RISCV_IOMMU_CQCSR_CQON;
> + ctrl_clr = RISCV_IOMMU_CQCSR_BUSY | RISCV_IOMMU_CQCSR_CQMF |
> + RISCV_IOMMU_CQCSR_CMD_ILL | RISCV_IOMMU_CQCSR_CMD_TO |
> + RISCV_IOMMU_CQCSR_FENCE_W_IP;
> + } else if (!enable && active) {
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_CQT], ~0);
> + ctrl_set = 0;
> + ctrl_clr = RISCV_IOMMU_CQCSR_BUSY | RISCV_IOMMU_CQCSR_CQON;
> + } else {
> + ctrl_set = 0;
> + ctrl_clr = RISCV_IOMMU_CQCSR_BUSY;
> + }
> +
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_CQCSR, ctrl_set, ctrl_clr);
> +}
> +
> +static void riscv_iommu_process_fq_control(RISCVIOMMUState *s)
> +{
> + uint64_t base;
> + uint32_t ctrl_set = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_FQCSR);
> + uint32_t ctrl_clr;
> + bool enable = !!(ctrl_set & RISCV_IOMMU_FQCSR_FQEN);
> + bool active = !!(ctrl_set & RISCV_IOMMU_FQCSR_FQON);
> +
> + if (enable && !active) {
> + base = riscv_iommu_reg_get64(s, RISCV_IOMMU_REG_FQB);
> + s->fq_mask = (2ULL << get_field(base, RISCV_IOMMU_FQB_LOG2SZ)) - 1;
> + s->fq_addr = PPN_PHYS(get_field(base, RISCV_IOMMU_FQB_PPN));
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_FQH], ~s->fq_mask);
> + stl_le_p(&s->regs_rw[RISCV_IOMMU_REG_FQH], 0);
> + stl_le_p(&s->regs_rw[RISCV_IOMMU_REG_FQT], 0);
> + ctrl_set = RISCV_IOMMU_FQCSR_FQON;
> + ctrl_clr = RISCV_IOMMU_FQCSR_BUSY | RISCV_IOMMU_FQCSR_FQMF |
> + RISCV_IOMMU_FQCSR_FQOF;
> + } else if (!enable && active) {
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_FQH], ~0);
> + ctrl_set = 0;
> + ctrl_clr = RISCV_IOMMU_FQCSR_BUSY | RISCV_IOMMU_FQCSR_FQON;
> + } else {
> + ctrl_set = 0;
> + ctrl_clr = RISCV_IOMMU_FQCSR_BUSY;
> + }
> +
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_FQCSR, ctrl_set, ctrl_clr);
> +}
> +
> +static void riscv_iommu_process_pq_control(RISCVIOMMUState *s)
> +{
> + uint64_t base;
> + uint32_t ctrl_set = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_PQCSR);
> + uint32_t ctrl_clr;
> + bool enable = !!(ctrl_set & RISCV_IOMMU_PQCSR_PQEN);
> + bool active = !!(ctrl_set & RISCV_IOMMU_PQCSR_PQON);
> +
> + if (enable && !active) {
> + base = riscv_iommu_reg_get64(s, RISCV_IOMMU_REG_PQB);
> + s->pq_mask = (2ULL << get_field(base, RISCV_IOMMU_PQB_LOG2SZ)) - 1;
> + s->pq_addr = PPN_PHYS(get_field(base, RISCV_IOMMU_PQB_PPN));
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_PQH], ~s->pq_mask);
> + stl_le_p(&s->regs_rw[RISCV_IOMMU_REG_PQH], 0);
> + stl_le_p(&s->regs_rw[RISCV_IOMMU_REG_PQT], 0);
> + ctrl_set = RISCV_IOMMU_PQCSR_PQON;
> + ctrl_clr = RISCV_IOMMU_PQCSR_BUSY | RISCV_IOMMU_PQCSR_PQMF |
> + RISCV_IOMMU_PQCSR_PQOF;
> + } else if (!enable && active) {
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_PQH], ~0);
> + ctrl_set = 0;
> + ctrl_clr = RISCV_IOMMU_PQCSR_BUSY | RISCV_IOMMU_PQCSR_PQON;
> + } else {
> + ctrl_set = 0;
> + ctrl_clr = RISCV_IOMMU_PQCSR_BUSY;
> + }
> +
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_PQCSR, ctrl_set, ctrl_clr);
> +}
> +
> +static void riscv_iommu_process_icvec_update(RISCVIOMMUState *s)
> +{
> + uint32_t icvec = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_ICVEC);
> +
> + s->icvec_update(s,
> + riscv_iommu_get_icvec_vector(icvec, RISCV_IOMMU_INTR_CQ),
> + riscv_iommu_get_icvec_vector(icvec, RISCV_IOMMU_INTR_FQ),
> + riscv_iommu_get_icvec_vector(icvec, RISCV_IOMMU_INTR_PM),
> + riscv_iommu_get_icvec_vector(icvec,
> RISCV_IOMMU_INTR_PQ));
> +}
> +
> +typedef void riscv_iommu_process_fn(RISCVIOMMUState *s);
> +
> +static void riscv_iommu_update_ipsr(RISCVIOMMUState *s, uint64_t data)
> +{
> + uint32_t cqcsr, fqcsr, pqcsr;
> + uint32_t ipsr_set = 0;
> + uint32_t ipsr_clr = 0;
> +
> + if (data & RISCV_IOMMU_IPSR_CIP) {
> + cqcsr = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_CQCSR);
> +
> + if (cqcsr & RISCV_IOMMU_CQCSR_CIE &&
> + (cqcsr & RISCV_IOMMU_CQCSR_FENCE_W_IP ||
> + cqcsr & RISCV_IOMMU_CQCSR_CMD_ILL ||
> + cqcsr & RISCV_IOMMU_CQCSR_CMD_TO ||
> + cqcsr & RISCV_IOMMU_CQCSR_CQMF)) {
> + ipsr_set |= RISCV_IOMMU_IPSR_CIP;
> + } else {
> + ipsr_clr |= RISCV_IOMMU_IPSR_CIP;
> + }
> + } else {
> + ipsr_clr |= RISCV_IOMMU_IPSR_CIP;
> + }
> +
> + if (data & RISCV_IOMMU_IPSR_FIP) {
> + fqcsr = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_FQCSR);
> +
> + if (fqcsr & RISCV_IOMMU_FQCSR_FIE &&
> + (fqcsr & RISCV_IOMMU_FQCSR_FQOF ||
> + fqcsr & RISCV_IOMMU_FQCSR_FQMF)) {
> + ipsr_set |= RISCV_IOMMU_IPSR_FIP;
> + } else {
> + ipsr_clr |= RISCV_IOMMU_IPSR_FIP;
> + }
> + } else {
> + ipsr_clr |= RISCV_IOMMU_IPSR_FIP;
> + }
> +
> + if (data & RISCV_IOMMU_IPSR_PIP) {
> + pqcsr = riscv_iommu_reg_get32(s, RISCV_IOMMU_REG_PQCSR);
> +
> + if (pqcsr & RISCV_IOMMU_PQCSR_PIE &&
> + (pqcsr & RISCV_IOMMU_PQCSR_PQOF ||
> + pqcsr & RISCV_IOMMU_PQCSR_PQMF)) {
> + ipsr_set |= RISCV_IOMMU_IPSR_PIP;
> + } else {
> + ipsr_clr |= RISCV_IOMMU_IPSR_PIP;
> + }
> + } else {
> + ipsr_clr |= RISCV_IOMMU_IPSR_PIP;
> + }
> +
> + riscv_iommu_reg_mod32(s, RISCV_IOMMU_REG_IPSR, ipsr_set, ipsr_clr);
> +}
> +
> +static MemTxResult riscv_iommu_mmio_write(void *opaque, hwaddr addr,
> + uint64_t data, unsigned size, MemTxAttrs attrs)
> +{
> + riscv_iommu_process_fn *process_fn = NULL;
> + RISCVIOMMUState *s = opaque;
> + uint32_t regb = addr & ~3;
> + uint32_t busy = 0;
> + uint64_t val = 0;
> +
> + if ((addr & (size - 1)) != 0) {
> + /* Unsupported MMIO alignment or access size */
> + return MEMTX_ERROR;
> + }
> +
> + if (addr + size > RISCV_IOMMU_REG_MSI_CONFIG) {
> + /* Unsupported MMIO access location. */
> + return MEMTX_ACCESS_ERROR;
> + }
> +
> + /* Track actionable MMIO write. */
> + switch (regb) {
> + case RISCV_IOMMU_REG_DDTP:
> + case RISCV_IOMMU_REG_DDTP + 4:
> + process_fn = riscv_iommu_process_ddtp;
> + regb = RISCV_IOMMU_REG_DDTP;
> + busy = RISCV_IOMMU_DDTP_BUSY;
> + break;
> +
> + case RISCV_IOMMU_REG_CQT:
> + process_fn = riscv_iommu_process_cq_tail;
> + break;
> +
> + case RISCV_IOMMU_REG_CQCSR:
> + process_fn = riscv_iommu_process_cq_control;
> + busy = RISCV_IOMMU_CQCSR_BUSY;
> + break;
> +
> + case RISCV_IOMMU_REG_FQCSR:
> + process_fn = riscv_iommu_process_fq_control;
> + busy = RISCV_IOMMU_FQCSR_BUSY;
> + break;
> +
> + case RISCV_IOMMU_REG_PQCSR:
> + process_fn = riscv_iommu_process_pq_control;
> + busy = RISCV_IOMMU_PQCSR_BUSY;
> + break;
> +
> + case RISCV_IOMMU_REG_ICVEC:
> + process_fn = riscv_iommu_process_icvec_update;
> + break;
> +
> + case RISCV_IOMMU_REG_IPSR:
> + /*
> + * IPSR has special procedures to update. Execute it
> + * and exit.
> + */
> + if (size == 4) {
> + uint32_t ro = ldl_le_p(&s->regs_ro[addr]);
> + uint32_t wc = ldl_le_p(&s->regs_wc[addr]);
> + uint32_t rw = ldl_le_p(&s->regs_rw[addr]);
> + stl_le_p(&val, ((rw & ro) | (data & ~ro)) & ~(data & wc));
> + } else if (size == 8) {
> + uint64_t ro = ldq_le_p(&s->regs_ro[addr]);
> + uint64_t wc = ldq_le_p(&s->regs_wc[addr]);
> + uint64_t rw = ldq_le_p(&s->regs_rw[addr]);
> + stq_le_p(&val, ((rw & ro) | (data & ~ro)) & ~(data & wc));
> + }
> +
> + riscv_iommu_update_ipsr(s, val);
> +
> + return MEMTX_OK;
> +
> + default:
> + break;
> + }
> +
> + /*
> + * Registers update might be not synchronized with core logic.
> + * If system software updates register when relevant BUSY bit
> + * is set IOMMU behavior of additional writes to the register
> + * is UNSPECIFIED.
> + */
> + qemu_spin_lock(&s->regs_lock);
> + if (size == 1) {
> + uint8_t ro = s->regs_ro[addr];
> + uint8_t wc = s->regs_wc[addr];
> + uint8_t rw = s->regs_rw[addr];
> + s->regs_rw[addr] = ((rw & ro) | (data & ~ro)) & ~(data & wc);
> + } else if (size == 2) {
> + uint16_t ro = lduw_le_p(&s->regs_ro[addr]);
> + uint16_t wc = lduw_le_p(&s->regs_wc[addr]);
> + uint16_t rw = lduw_le_p(&s->regs_rw[addr]);
> + stw_le_p(&s->regs_rw[addr], ((rw & ro) | (data & ~ro)) & ~(data &
> wc));
> + } else if (size == 4) {
> + uint32_t ro = ldl_le_p(&s->regs_ro[addr]);
> + uint32_t wc = ldl_le_p(&s->regs_wc[addr]);
> + uint32_t rw = ldl_le_p(&s->regs_rw[addr]);
> + stl_le_p(&s->regs_rw[addr], ((rw & ro) | (data & ~ro)) & ~(data &
> wc));
> + } else if (size == 8) {
> + uint64_t ro = ldq_le_p(&s->regs_ro[addr]);
> + uint64_t wc = ldq_le_p(&s->regs_wc[addr]);
> + uint64_t rw = ldq_le_p(&s->regs_rw[addr]);
> + stq_le_p(&s->regs_rw[addr], ((rw & ro) | (data & ~ro)) & ~(data &
> wc));
> + }
> +
> + /* Busy flag update, MSB 4-byte register. */
> + if (busy) {
> + uint32_t rw = ldl_le_p(&s->regs_rw[regb]);
> + stl_le_p(&s->regs_rw[regb], rw | busy);
> + }
> + qemu_spin_unlock(&s->regs_lock);
> +
> + if (process_fn) {
> + qemu_mutex_lock(&s->core_lock);
> + process_fn(s);
> + qemu_mutex_unlock(&s->core_lock);
> + }
> +
> + return MEMTX_OK;
> +}
> +
> +static MemTxResult riscv_iommu_mmio_read(void *opaque, hwaddr addr,
> + uint64_t *data, unsigned size, MemTxAttrs attrs)
> +{
> + RISCVIOMMUState *s = opaque;
> + uint64_t val = -1;
> + uint8_t *ptr;
> +
> + if ((addr & (size - 1)) != 0) {
> + /* Unsupported MMIO alignment. */
> + return MEMTX_ERROR;
> + }
> +
> + if (addr + size > RISCV_IOMMU_REG_MSI_CONFIG) {
> + return MEMTX_ACCESS_ERROR;
> + }
> +
> + ptr = &s->regs_rw[addr];
> +
> + if (size == 1) {
> + val = (uint64_t)*ptr;
> + } else if (size == 2) {
> + val = lduw_le_p(ptr);
> + } else if (size == 4) {
> + val = ldl_le_p(ptr);
> + } else if (size == 8) {
> + val = ldq_le_p(ptr);
> + } else {
> + return MEMTX_ERROR;
> + }
> +
> + *data = val;
> +
> + return MEMTX_OK;
> +}
> +
> +static const MemoryRegionOps riscv_iommu_mmio_ops = {
> + .read_with_attrs = riscv_iommu_mmio_read,
> + .write_with_attrs = riscv_iommu_mmio_write,
> + .endianness = DEVICE_NATIVE_ENDIAN,
> + .impl = {
> + .min_access_size = 4,
> + .max_access_size = 8,
> + .unaligned = false,
> + },
> + .valid = {
> + .min_access_size = 4,
> + .max_access_size = 8,
> + }
> +};
> +
> +/*
> + * Translations matching MSI pattern check are redirected to
> "riscv-iommu-trap"
> + * memory region as untranslated address, for additional MSI/MRIF
> interception
> + * by IOMMU interrupt remapping implementation.
> + * Note: Device emulation code generating an MSI is expected to provide a
> valid
> + * memory transaction attributes with requested_id set.
> + */
> +static MemTxResult riscv_iommu_trap_write(void *opaque, hwaddr addr,
> + uint64_t data, unsigned size, MemTxAttrs attrs)
> +{
> + RISCVIOMMUState* s = (RISCVIOMMUState *)opaque;
> + RISCVIOMMUContext *ctx;
> + MemTxResult res;
> + void *ref;
> + uint32_t devid = attrs.requester_id;
> +
> + if (attrs.unspecified) {
> + return MEMTX_ACCESS_ERROR;
> + }
> +
> + /* FIXME: PCIe bus remapping for attached endpoints. */
> + devid |= s->bus << 8;
> +
> + ctx = riscv_iommu_ctx(s, devid, 0, &ref);
> + if (ctx == NULL) {
> + res = MEMTX_ACCESS_ERROR;
> + } else {
> + res = riscv_iommu_msi_write(s, ctx, addr, data, size, attrs);
> + }
> + riscv_iommu_ctx_put(s, ref);
> + return res;
> +}
> +
> +static MemTxResult riscv_iommu_trap_read(void *opaque, hwaddr addr,
> + uint64_t *data, unsigned size, MemTxAttrs attrs)
> +{
> + return MEMTX_ACCESS_ERROR;
> +}
> +
> +static const MemoryRegionOps riscv_iommu_trap_ops = {
> + .read_with_attrs = riscv_iommu_trap_read,
> + .write_with_attrs = riscv_iommu_trap_write,
> + .endianness = DEVICE_LITTLE_ENDIAN,
> + .impl = {
> + .min_access_size = 4,
> + .max_access_size = 8,
> + .unaligned = true,
> + },
> + .valid = {
> + .min_access_size = 4,
> + .max_access_size = 8,
> + }
> +};
> +
> +static void riscv_iommu_realize(DeviceState *dev, Error **errp)
> +{
> + RISCVIOMMUState *s = RISCV_IOMMU(dev);
> +
> + s->cap = s->version & RISCV_IOMMU_CAP_VERSION;
> + if (s->enable_msi) {
> + s->cap |= RISCV_IOMMU_CAP_MSI_FLAT | RISCV_IOMMU_CAP_MSI_MRIF;
> + }
> + if (s->enable_s_stage) {
> + s->cap |= RISCV_IOMMU_CAP_SV32 | RISCV_IOMMU_CAP_SV39 |
> + RISCV_IOMMU_CAP_SV48 | RISCV_IOMMU_CAP_SV57;
> + }
> + if (s->enable_g_stage) {
> + s->cap |= RISCV_IOMMU_CAP_SV32X4 | RISCV_IOMMU_CAP_SV39X4 |
> + RISCV_IOMMU_CAP_SV48X4 | RISCV_IOMMU_CAP_SV57X4;
> + }
> + /* Report QEMU target physical address space limits */
> + s->cap = set_field(s->cap, RISCV_IOMMU_CAP_PAS,
> + TARGET_PHYS_ADDR_SPACE_BITS);
> +
> + /* TODO: method to report supported PID bits */
> + s->pid_bits = 8; /* restricted to size of MemTxAttrs.pid */
> + s->cap |= RISCV_IOMMU_CAP_PD8;
> +
> + /* Out-of-reset translation mode: OFF (DMA disabled) BARE (passthrough)
> */
> + s->ddtp = set_field(0, RISCV_IOMMU_DDTP_MODE, s->enable_off ?
> + RISCV_IOMMU_DDTP_MODE_OFF :
> RISCV_IOMMU_DDTP_MODE_BARE);
> +
> + /* register storage */
> + s->regs_rw = g_new0(uint8_t, RISCV_IOMMU_REG_SIZE);
> + s->regs_ro = g_new0(uint8_t, RISCV_IOMMU_REG_SIZE);
> + s->regs_wc = g_new0(uint8_t, RISCV_IOMMU_REG_SIZE);
> +
> + /* Mark all registers read-only */
> + memset(s->regs_ro, 0xff, RISCV_IOMMU_REG_SIZE);
> +
> + /*
> + * Register complete MMIO space, including MSI/PBA registers.
> + * Note, PCIDevice implementation will add overlapping MR for MSI/PBA,
> + * managed directly by the PCIDevice implementation.
> + */
> + memory_region_init_io(&s->regs_mr, OBJECT(dev), &riscv_iommu_mmio_ops, s,
> + "riscv-iommu-regs", RISCV_IOMMU_REG_SIZE);
> +
> + /* Set power-on register state */
> + stq_le_p(&s->regs_rw[RISCV_IOMMU_REG_CAP], s->cap);
> + stq_le_p(&s->regs_rw[RISCV_IOMMU_REG_FCTL], 0);
> + stq_le_p(&s->regs_ro[RISCV_IOMMU_REG_FCTL],
> + ~(RISCV_IOMMU_FCTL_BE | RISCV_IOMMU_FCTL_WSI));
> + stq_le_p(&s->regs_ro[RISCV_IOMMU_REG_DDTP],
> + ~(RISCV_IOMMU_DDTP_PPN | RISCV_IOMMU_DDTP_MODE));
> + stq_le_p(&s->regs_ro[RISCV_IOMMU_REG_CQB],
> + ~(RISCV_IOMMU_CQB_LOG2SZ | RISCV_IOMMU_CQB_PPN));
> + stq_le_p(&s->regs_ro[RISCV_IOMMU_REG_FQB],
> + ~(RISCV_IOMMU_FQB_LOG2SZ | RISCV_IOMMU_FQB_PPN));
> + stq_le_p(&s->regs_ro[RISCV_IOMMU_REG_PQB],
> + ~(RISCV_IOMMU_PQB_LOG2SZ | RISCV_IOMMU_PQB_PPN));
> + stl_le_p(&s->regs_wc[RISCV_IOMMU_REG_CQCSR], RISCV_IOMMU_CQCSR_CQMF |
> + RISCV_IOMMU_CQCSR_CMD_TO | RISCV_IOMMU_CQCSR_CMD_ILL);
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_CQCSR], RISCV_IOMMU_CQCSR_CQON |
> + RISCV_IOMMU_CQCSR_BUSY);
> + stl_le_p(&s->regs_wc[RISCV_IOMMU_REG_FQCSR], RISCV_IOMMU_FQCSR_FQMF |
> + RISCV_IOMMU_FQCSR_FQOF);
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_FQCSR], RISCV_IOMMU_FQCSR_FQON |
> + RISCV_IOMMU_FQCSR_BUSY);
> + stl_le_p(&s->regs_wc[RISCV_IOMMU_REG_PQCSR], RISCV_IOMMU_PQCSR_PQMF |
> + RISCV_IOMMU_PQCSR_PQOF);
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_PQCSR], RISCV_IOMMU_PQCSR_PQON |
> + RISCV_IOMMU_PQCSR_BUSY);
> + stl_le_p(&s->regs_wc[RISCV_IOMMU_REG_IPSR], ~0);
> + stl_le_p(&s->regs_ro[RISCV_IOMMU_REG_ICVEC], 0);
> + stq_le_p(&s->regs_rw[RISCV_IOMMU_REG_DDTP], s->ddtp);
> +
> + /* Memory region for downstream access, if specified. */
> + if (s->target_mr) {
> + s->target_as = g_new0(AddressSpace, 1);
> + address_space_init(s->target_as, s->target_mr,
> + "riscv-iommu-downstream");
> + } else {
> + /* Fallback to global system memory. */
> + s->target_as = &address_space_memory;
> + }
> +
> + /* Memory region for untranslated MRIF/MSI writes */
> + memory_region_init_io(&s->trap_mr, OBJECT(dev), &riscv_iommu_trap_ops, s,
> + "riscv-iommu-trap", ~0ULL);
> + address_space_init(&s->trap_as, &s->trap_mr, "riscv-iommu-trap-as");
> +
> + /* Device translation context cache */
> + s->ctx_cache = g_hash_table_new_full(__ctx_hash, __ctx_equal,
> + g_free, NULL);
> + qemu_mutex_init(&s->ctx_lock);
> +
> + s->iommus.le_next = NULL;
> + s->iommus.le_prev = NULL;
> + QLIST_INIT(&s->spaces);
> + qemu_mutex_init(&s->core_lock);
> + qemu_spin_init(&s->regs_lock);
> +}
> +
> +static void riscv_iommu_unrealize(DeviceState *dev)
> +{
> + RISCVIOMMUState *s = RISCV_IOMMU(dev);
> +
> + qemu_mutex_destroy(&s->core_lock);
> + g_hash_table_unref(s->ctx_cache);
> +}
> +
> +static Property riscv_iommu_properties[] = {
> + DEFINE_PROP_UINT32("version", RISCVIOMMUState, version,
> + RISCV_IOMMU_SPEC_DOT_VER),
> + DEFINE_PROP_UINT32("bus", RISCVIOMMUState, bus, 0x0),
> + DEFINE_PROP_BOOL("intremap", RISCVIOMMUState, enable_msi, TRUE),
> + DEFINE_PROP_BOOL("off", RISCVIOMMUState, enable_off, TRUE),
> + DEFINE_PROP_BOOL("s-stage", RISCVIOMMUState, enable_s_stage, TRUE),
> + DEFINE_PROP_BOOL("g-stage", RISCVIOMMUState, enable_g_stage, TRUE),
> + DEFINE_PROP_LINK("downstream-mr", RISCVIOMMUState, target_mr,
> + TYPE_MEMORY_REGION, MemoryRegion *),
> + DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void riscv_iommu_class_init(ObjectClass *klass, void* data)
> +{
> + DeviceClass *dc = DEVICE_CLASS(klass);
> +
> + /* internal device for riscv-iommu-{pci/sys}, not user-creatable */
> + dc->user_creatable = false;
> + dc->realize = riscv_iommu_realize;
> + dc->unrealize = riscv_iommu_unrealize;
> + device_class_set_props(dc, riscv_iommu_properties);
> +}
> +
> +static const TypeInfo riscv_iommu_info = {
> + .name = TYPE_RISCV_IOMMU,
> + .parent = TYPE_DEVICE,
> + .instance_size = sizeof(RISCVIOMMUState),
> + .class_init = riscv_iommu_class_init,
> +};
> +
> +static const char *IOMMU_FLAG_STR[] = {
> + "NA",
> + "RO",
> + "WR",
> + "RW",
> +};
> +
> +/* RISC-V IOMMU Memory Region - Address Translation Space */
> +static IOMMUTLBEntry riscv_iommu_memory_region_translate(
> + IOMMUMemoryRegion *iommu_mr, hwaddr addr,
> + IOMMUAccessFlags flag, int iommu_idx)
> +{
> + RISCVIOMMUSpace *as = container_of(iommu_mr, RISCVIOMMUSpace, iova_mr);
> + RISCVIOMMUContext *ctx;
> + void *ref;
> + IOMMUTLBEntry iotlb = {
> + .iova = addr,
> + .target_as = as->iommu->target_as,
> + .addr_mask = ~0ULL,
> + .perm = flag,
> + };
> +
> + ctx = riscv_iommu_ctx(as->iommu, as->devid, iommu_idx, &ref);
> + if (ctx == NULL) {
> + /* Translation disabled or invalid. */
> + iotlb.addr_mask = 0;
> + iotlb.perm = IOMMU_NONE;
> + } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb)) {
> + /* Translation disabled or fault reported. */
> + iotlb.addr_mask = 0;
> + iotlb.perm = IOMMU_NONE;
> + }
> +
> + /* Trace all dma translations with original access flags. */
> + trace_riscv_iommu_dma(as->iommu->parent_obj.id, PCI_BUS_NUM(as->devid),
> + PCI_SLOT(as->devid), PCI_FUNC(as->devid),
> iommu_idx,
> + IOMMU_FLAG_STR[flag & IOMMU_RW], iotlb.iova,
> + iotlb.translated_addr);
> +
> + riscv_iommu_ctx_put(as->iommu, ref);
> +
> + return iotlb;
> +}
> +
> +static int riscv_iommu_memory_region_notify(
> + IOMMUMemoryRegion *iommu_mr, IOMMUNotifierFlag old,
> + IOMMUNotifierFlag new, Error **errp)
> +{
> + RISCVIOMMUSpace *as = container_of(iommu_mr, RISCVIOMMUSpace, iova_mr);
> +
> + if (old == IOMMU_NOTIFIER_NONE) {
> + as->notifier = true;
> + trace_riscv_iommu_notifier_add(iommu_mr->parent_obj.name);
> + } else if (new == IOMMU_NOTIFIER_NONE) {
> + as->notifier = false;
> + trace_riscv_iommu_notifier_del(iommu_mr->parent_obj.name);
> + }
> +
> + return 0;
> +}
> +
> +static inline bool pci_is_iommu(PCIDevice *pdev)
> +{
> + return pci_get_word(pdev->config + PCI_CLASS_DEVICE) == 0x0806;
> +}
> +
> +static AddressSpace *riscv_iommu_find_as(PCIBus *bus, void *opaque, int
> devfn)
> +{
> + RISCVIOMMUState *s = (RISCVIOMMUState *) opaque;
> + PCIDevice *pdev = pci_find_device(bus, pci_bus_num(bus), devfn);
> + AddressSpace *as = NULL;
> +
> + if (pdev && pci_is_iommu(pdev)) {
> + return s->target_as;
> + }
> +
> + /* Find first registered IOMMU device */
> + while (s->iommus.le_prev) {
> + s = *(s->iommus.le_prev);
> + }
> +
> + /* Find first matching IOMMU */
> + while (s != NULL && as == NULL) {
> + as = riscv_iommu_space(s, PCI_BUILD_BDF(pci_bus_num(bus), devfn));
> + s = s->iommus.le_next;
> + }
> +
> + return as ? as : &address_space_memory;
> +}
> +
> +static const PCIIOMMUOps riscv_iommu_ops = {
> + .get_address_space = riscv_iommu_find_as,
> +};
> +
> +void riscv_iommu_pci_setup_iommu(RISCVIOMMUState *iommu, PCIBus *bus,
> + Error **errp)
> +{
> + if (bus->iommu_ops &&
> + bus->iommu_ops->get_address_space == riscv_iommu_find_as) {
> + /* Allow multiple IOMMUs on the same PCIe bus, link known devices */
> + RISCVIOMMUState *last = (RISCVIOMMUState *)bus->iommu_opaque;
> + QLIST_INSERT_AFTER(last, iommu, iommus);
> + } else if (!bus->iommu_ops && !bus->iommu_opaque) {
> + pci_setup_iommu(bus, &riscv_iommu_ops, iommu);
> + } else {
> + error_setg(errp, "can't register secondary IOMMU for PCI bus #%d",
> + pci_bus_num(bus));
> + }
> +}
> +
> +static int riscv_iommu_memory_region_index(IOMMUMemoryRegion *iommu_mr,
> + MemTxAttrs attrs)
> +{
> + return attrs.unspecified ? RISCV_IOMMU_NOPROCID : (int)attrs.pid;
> +}
> +
> +static int riscv_iommu_memory_region_index_len(IOMMUMemoryRegion *iommu_mr)
> +{
> + RISCVIOMMUSpace *as = container_of(iommu_mr, RISCVIOMMUSpace, iova_mr);
> + return 1 << as->iommu->pid_bits;
> +}
> +
> +static void riscv_iommu_memory_region_init(ObjectClass *klass, void *data)
> +{
> + IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass);
> +
> + imrc->translate = riscv_iommu_memory_region_translate;
> + imrc->notify_flag_changed = riscv_iommu_memory_region_notify;
> + imrc->attrs_to_index = riscv_iommu_memory_region_index;
> + imrc->num_indexes = riscv_iommu_memory_region_index_len;
> +}
> +
> +static const TypeInfo riscv_iommu_memory_region_info = {
> + .parent = TYPE_IOMMU_MEMORY_REGION,
> + .name = TYPE_RISCV_IOMMU_MEMORY_REGION,
> + .class_init = riscv_iommu_memory_region_init,
> +};
> +
> +static void riscv_iommu_register_mr_types(void)
> +{
> + type_register_static(&riscv_iommu_memory_region_info);
> + type_register_static(&riscv_iommu_info);
> +}
> +
> +type_init(riscv_iommu_register_mr_types);
> diff --git a/hw/riscv/riscv-iommu.h b/hw/riscv/riscv-iommu.h
> new file mode 100644
> index 0000000000..6d76cb9b1a
> --- /dev/null
> +++ b/hw/riscv/riscv-iommu.h
> @@ -0,0 +1,148 @@
> +/*
> + * QEMU emulation of an RISC-V IOMMU
> + *
> + * Copyright (C) 2022-2023 Rivos Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef HW_RISCV_IOMMU_STATE_H
> +#define HW_RISCV_IOMMU_STATE_H
> +
> +#include "qemu/osdep.h"
> +#include "qom/object.h"
> +
> +#include "hw/riscv/iommu.h"
> +
> +struct RISCVIOMMUState {
> + /*< private >*/
> + DeviceState parent_obj;
> +
> + /*< public >*/
> + uint32_t version; /* Reported interface version number */
> + uint32_t pid_bits; /* process identifier width */
> + uint32_t bus; /* PCI bus mapping for non-root endpoints */
> +
> + uint64_t cap; /* IOMMU supported capabilities */
> + uint64_t fctl; /* IOMMU enabled features */
> +
> + bool enable_off; /* Enable out-of-reset OFF mode (DMA disabled) */
> + bool enable_msi; /* Enable MSI remapping */
> + bool enable_s_stage; /* Enable S/VS-Stage translation */
> + bool enable_g_stage; /* Enable G-Stage translation */
> +
> + /* IOMMU Internal State */
> + uint64_t ddtp; /* Validated Device Directory Tree Root Pointer */
> +
> + dma_addr_t cq_addr; /* Command queue base physical address */
> + dma_addr_t fq_addr; /* Fault/event queue base physical address */
> + dma_addr_t pq_addr; /* Page request queue base physical address */
> +
> + uint32_t cq_mask; /* Command queue index bit mask */
> + uint32_t fq_mask; /* Fault/event queue index bit mask */
> + uint32_t pq_mask; /* Page request queue index bit mask */
> +
> + /* interrupt notifier */
> + void (*notify)(RISCVIOMMUState *iommu, unsigned vector);
> + /* register icvec interrupts */
> + void (*icvec_update)(RISCVIOMMUState *iommu,
> + uint32_t civ, uint32_t fiv,
> + uint32_t pmiv, uint32_t piv);
> +
> + /* IOMMU State Machine */
> + QemuThread core_proc; /* Background processing thread */
> + QemuMutex core_lock; /* Global IOMMU lock, used for cache/regs updates
> */
> + QemuCond core_cond; /* Background processing wake up signal */
> + unsigned core_exec; /* Processing thread execution actions */
> +
> + /* IOMMU target address space */
> + AddressSpace *target_as;
> + MemoryRegion *target_mr;
> +
> + /* MSI / MRIF access trap */
> + AddressSpace trap_as;
> + MemoryRegion trap_mr;
> +
> + GHashTable *ctx_cache; /* Device translation Context Cache */
> + QemuMutex ctx_lock; /* Device translation Cache update lock */
> +
> + /* MMIO Hardware Interface */
> + MemoryRegion regs_mr;
> + QemuSpin regs_lock;
> + uint8_t *regs_rw; /* register state (user write) */
> + uint8_t *regs_wc; /* write-1-to-clear mask */
> + uint8_t *regs_ro; /* read-only mask */
> +
> + QLIST_ENTRY(RISCVIOMMUState) iommus;
> + QLIST_HEAD(, RISCVIOMMUSpace) spaces;
> +};
> +
> +void riscv_iommu_pci_setup_iommu(RISCVIOMMUState *iommu, PCIBus *bus,
> + Error **errp);
> +
> +/* private helpers */
> +
> +/* Register helper functions */
> +static inline uint32_t riscv_iommu_reg_mod32(RISCVIOMMUState *s,
> + unsigned idx, uint32_t set, uint32_t clr)
> +{
> + uint32_t val;
> + qemu_spin_lock(&s->regs_lock);
> + val = ldl_le_p(s->regs_rw + idx);
> + stl_le_p(s->regs_rw + idx, (val & ~clr) | set);
> + qemu_spin_unlock(&s->regs_lock);
> + return val;
> +}
> +
> +static inline void riscv_iommu_reg_set32(RISCVIOMMUState *s,
> + unsigned idx, uint32_t set)
> +{
> + qemu_spin_lock(&s->regs_lock);
> + stl_le_p(s->regs_rw + idx, set);
> + qemu_spin_unlock(&s->regs_lock);
> +}
> +
> +static inline uint32_t riscv_iommu_reg_get32(RISCVIOMMUState *s,
> + unsigned idx)
> +{
> + return ldl_le_p(s->regs_rw + idx);
> +}
> +
> +static inline uint64_t riscv_iommu_reg_mod64(RISCVIOMMUState *s,
> + unsigned idx, uint64_t set, uint64_t clr)
> +{
> + uint64_t val;
> + qemu_spin_lock(&s->regs_lock);
> + val = ldq_le_p(s->regs_rw + idx);
> + stq_le_p(s->regs_rw + idx, (val & ~clr) | set);
> + qemu_spin_unlock(&s->regs_lock);
> + return val;
> +}
> +
> +static inline void riscv_iommu_reg_set64(RISCVIOMMUState *s,
> + unsigned idx, uint64_t set)
> +{
> + qemu_spin_lock(&s->regs_lock);
> + stq_le_p(s->regs_rw + idx, set);
> + qemu_spin_unlock(&s->regs_lock);
> +}
> +
> +static inline uint64_t riscv_iommu_reg_get64(RISCVIOMMUState *s,
> + unsigned idx)
> +{
> + return ldq_le_p(s->regs_rw + idx);
> +}
> +
> +
> +
> +#endif
> diff --git a/hw/riscv/trace-events b/hw/riscv/trace-events
> new file mode 100644
> index 0000000000..bdd8b657a6
> --- /dev/null
> +++ b/hw/riscv/trace-events
> @@ -0,0 +1,12 @@
> +# See documentation at docs/devel/tracing.rst
> +
> +# riscv-iommu.c
> +riscv_iommu_new(const char *id, unsigned b, unsigned d, unsigned f) "%s:
> device attached %04x:%02x.%d"
> +riscv_iommu_flt(const char *id, unsigned b, unsigned d, unsigned f, uint64_t
> reason, uint64_t iova) "%s: fault %04x:%02x.%u reason: 0x%"PRIx64" iova:
> 0x%"PRIx64
> +riscv_iommu_pri(const char *id, unsigned b, unsigned d, unsigned f, uint64_t
> iova) "%s: page request %04x:%02x.%u iova: 0x%"PRIx64
> +riscv_iommu_dma(const char *id, unsigned b, unsigned d, unsigned f, unsigned
> pasid, const char *dir, uint64_t iova, uint64_t phys) "%s: translate
> %04x:%02x.%u #%u %s 0x%"PRIx64" -> 0x%"PRIx64
> +riscv_iommu_msi(const char *id, unsigned b, unsigned d, unsigned f, uint64_t
> iova, uint64_t phys) "%s: translate %04x:%02x.%u MSI 0x%"PRIx64" -> 0x%"PRIx64
> +riscv_iommu_mrif_notification(const char *id, uint32_t nid, uint64_t phys)
> "%s: sent MRIF notification 0x%x to 0x%"PRIx64
> +riscv_iommu_cmd(const char *id, uint64_t l, uint64_t u) "%s: command
> 0x%"PRIx64" 0x%"PRIx64
> +riscv_iommu_notifier_add(const char *id) "%s: dev-iotlb notifier added"
> +riscv_iommu_notifier_del(const char *id) "%s: dev-iotlb notifier removed"
> diff --git a/hw/riscv/trace.h b/hw/riscv/trace.h
> new file mode 100644
> index 0000000000..8c0e3ca1f3
> --- /dev/null
> +++ b/hw/riscv/trace.h
> @@ -0,0 +1 @@
> +#include "trace/trace-hw_riscv.h"
> diff --git a/include/hw/riscv/iommu.h b/include/hw/riscv/iommu.h
> new file mode 100644
> index 0000000000..070ee69973
> --- /dev/null
> +++ b/include/hw/riscv/iommu.h
> @@ -0,0 +1,36 @@
> +/*
> + * QEMU emulation of an RISC-V IOMMU
> + *
> + * Copyright (C) 2022-2023 Rivos Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef HW_RISCV_IOMMU_H
> +#define HW_RISCV_IOMMU_H
> +
> +#include "qemu/osdep.h"
> +#include "qom/object.h"
> +
> +#define TYPE_RISCV_IOMMU "riscv-iommu"
> +OBJECT_DECLARE_SIMPLE_TYPE(RISCVIOMMUState, RISCV_IOMMU)
> +typedef struct RISCVIOMMUState RISCVIOMMUState;
> +
> +#define TYPE_RISCV_IOMMU_MEMORY_REGION "riscv-iommu-mr"
> +typedef struct RISCVIOMMUSpace RISCVIOMMUSpace;
> +
> +#define TYPE_RISCV_IOMMU_PCI "riscv-iommu-pci"
> +OBJECT_DECLARE_SIMPLE_TYPE(RISCVIOMMUStatePci, RISCV_IOMMU_PCI)
> +typedef struct RISCVIOMMUStatePci RISCVIOMMUStatePci;
> +
> +#endif
> diff --git a/meson.build b/meson.build
> index a1e51277b0..359f836d8e 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -3373,6 +3373,7 @@ if have_system
> 'hw/pci-host',
> 'hw/ppc',
> 'hw/rtc',
> + 'hw/riscv',
> 'hw/s390x',
> 'hw/scsi',
> 'hw/sd',
> --
> 2.45.2
>
>
