| Message ID | 20240801154334.1009852-9-dbarboza@ventanamicro.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | riscv: QEMU RISC-V IOMMU Support | expand |
Hi Daniel, On 2024/8/1 下午 11:43, Daniel Henrique Barboza wrote: > From: Tomasz Jeznach <tjeznach@rivosinc.com> > > The RISC-V IOMMU spec predicts that the IOMMU can use translation caches > to hold entries from the DDT. This includes implementation for all cache > commands that are marked as 'not implemented'. > > There are some artifacts included in the cache that predicts s-stage and > g-stage elements, although we don't support it yet. We'll introduce them > next. > > Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com> > Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> > Reviewed-by: Frank Chang <frank.chang@sifive.com> > Acked-by: Alistair Francis <alistair.francis@wdc.com> > --- > hw/riscv/riscv-iommu.c | 199 ++++++++++++++++++++++++++++++++++++++++- > hw/riscv/riscv-iommu.h | 3 + > 2 files changed, 198 insertions(+), 4 deletions(-) > > diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c > index ebe3a53a04..3816e6a493 100644 > --- a/hw/riscv/riscv-iommu.c > +++ b/hw/riscv/riscv-iommu.c > @@ -65,6 +65,16 @@ struct RISCVIOMMUContext { > uint64_t msiptp; /* MSI redirection page table pointer */ > }; > > +/* Address translation cache entry */ > +struct RISCVIOMMUEntry { > + uint64_t iova:44; /* IOVA Page Number */ > + uint64_t pscid:20; /* Process Soft-Context identifier */ > + uint64_t phys:44; /* Physical Page Number */ > + uint64_t gscid:16; /* Guest Soft-Context identifier */ > + uint64_t perm:2; /* IOMMU_RW flags */ > + uint64_t __rfu:2; > +}; > + > /* IOMMU index for transactions without process_id specified. */ > #define RISCV_IOMMU_NOPROCID 0 > > @@ -1138,13 +1148,130 @@ static AddressSpace *riscv_iommu_space(RISCVIOMMUState *s, uint32_t devid) > return &as->iova_as; > } > > +/* Translation Object cache support */ > +static gboolean __iot_equal(gconstpointer v1, gconstpointer v2) > +{ > + RISCVIOMMUEntry *t1 = (RISCVIOMMUEntry *) v1; > + RISCVIOMMUEntry *t2 = (RISCVIOMMUEntry *) v2; > + return t1->gscid == t2->gscid && t1->pscid == t2->pscid && > + t1->iova == t2->iova; > +} > + > +static guint __iot_hash(gconstpointer v) > +{ > + RISCVIOMMUEntry *t = (RISCVIOMMUEntry *) v; > + return (guint)t->iova; > +} > + > +/* GV: 1 PSCV: 1 AV: 1 */ > +static void __iot_inval_pscid_iova(gpointer key, gpointer value, gpointer data) > +{ > + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > + if (iot->gscid == arg->gscid && > + iot->pscid == arg->pscid && > + iot->iova == arg->iova) { > + iot->perm = IOMMU_NONE; > + } > +} > + > +/* GV: 1 PSCV: 1 AV: 0 */ > +static void __iot_inval_pscid(gpointer key, gpointer value, gpointer data) > +{ > + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > + if (iot->gscid == arg->gscid && > + iot->pscid == arg->pscid) { > + iot->perm = IOMMU_NONE; > + } > +} > + > +/* GV: 1 GVMA: 1 */ > +static void __iot_inval_gscid_gpa(gpointer key, gpointer value, gpointer data) > +{ > + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > + if (iot->gscid == arg->gscid) { > + /* simplified cache, no GPA matching */ > + iot->perm = IOMMU_NONE; > + } > +} > + > +/* GV: 1 GVMA: 0 */ > +static void __iot_inval_gscid(gpointer key, gpointer value, gpointer data) > +{ > + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > + if (iot->gscid == arg->gscid) { > + iot->perm = IOMMU_NONE; > + } > +} > + > +/* GV: 0 */ > +static void __iot_inval_all(gpointer key, gpointer value, gpointer data) > +{ > + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > + iot->perm = IOMMU_NONE; > +} > + > +/* caller should keep ref-count for iot_cache object */ > +static RISCVIOMMUEntry *riscv_iommu_iot_lookup(RISCVIOMMUContext *ctx, > + GHashTable *iot_cache, hwaddr iova) > +{ > + RISCVIOMMUEntry key = { > + .gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID), > + .pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID), > + .iova = PPN_DOWN(iova), > + }; > + return g_hash_table_lookup(iot_cache, &key); > +} > + > +/* caller should keep ref-count for iot_cache object */ > +static void riscv_iommu_iot_update(RISCVIOMMUState *s, > + GHashTable *iot_cache, RISCVIOMMUEntry *iot) > +{ > + if (!s->iot_limit) { > + return; > + } > + > + qemu_mutex_lock(&s->iot_lock); > + if (g_hash_table_size(s->iot_cache) >= s->iot_limit) { > + iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, > + g_free, NULL); > + g_hash_table_unref(qatomic_xchg(&s->iot_cache, iot_cache)); > + } > + g_hash_table_add(iot_cache, iot); > + qemu_mutex_unlock(&s->iot_lock); > +} > + > +static void riscv_iommu_iot_inval(RISCVIOMMUState *s, GHFunc func, > + uint32_t gscid, uint32_t pscid, hwaddr iova) > +{ > + GHashTable *iot_cache; > + RISCVIOMMUEntry key = { > + .gscid = gscid, > + .pscid = pscid, > + .iova = PPN_DOWN(iova), > + }; > + > + iot_cache = g_hash_table_ref(s->iot_cache); > + qemu_mutex_lock(&s->iot_lock); > + g_hash_table_foreach(iot_cache, func, &key); > + qemu_mutex_unlock(&s->iot_lock); > + g_hash_table_unref(iot_cache); > +} > + > static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, > - IOMMUTLBEntry *iotlb) > + IOMMUTLBEntry *iotlb, bool enable_cache) > { > + RISCVIOMMUEntry *iot; > + IOMMUAccessFlags perm; > bool enable_pid; > bool enable_pri; > + GHashTable *iot_cache; > int fault; > > + iot_cache = g_hash_table_ref(s->iot_cache); > /* > * TC[32] is reserved for custom extensions, used here to temporarily > * enable automatic page-request generation for ATS queries. > @@ -1152,9 +1279,39 @@ static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, > enable_pri = (iotlb->perm == IOMMU_NONE) && (ctx->tc & BIT_ULL(32)); > enable_pid = (ctx->tc & RISCV_IOMMU_DC_TC_PDTV); > > + qemu_mutex_lock(&s->iot_lock); > + iot = riscv_iommu_iot_lookup(ctx, iot_cache, iotlb->iova); > + qemu_mutex_unlock(&s->iot_lock); > + perm = iot ? iot->perm : IOMMU_NONE; > + if (perm != IOMMU_NONE) { > + iotlb->translated_addr = PPN_PHYS(iot->phys); > + iotlb->addr_mask = ~TARGET_PAGE_MASK; > + iotlb->perm = perm; > + fault = 0; > + goto done; > + } > + > /* Translate using device directory / page table information. */ > fault = riscv_iommu_spa_fetch(s, ctx, iotlb); > > + if (!fault && iotlb->target_as == &s->trap_as) { > + /* Do not cache trapped MSI translations */ > + goto done; > + } > + > + if (!fault && iotlb->translated_addr != iotlb->iova && enable_cache) { Shouldn't addresses which don't need to be translated also be cached? > + iot = g_new0(RISCVIOMMUEntry, 1); > + iot->iova = PPN_DOWN(iotlb->iova); > + iot->phys = PPN_DOWN(iotlb->translated_addr); > + iot->gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID); > + iot->pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID); > + iot->perm = iotlb->perm; > + riscv_iommu_iot_update(s, iot_cache, iot); > + } > + > +done: > + g_hash_table_unref(iot_cache); > + > if (enable_pri && fault) { > struct riscv_iommu_pq_record pr = {0}; > if (enable_pid) { > @@ -1294,13 +1451,40 @@ static void riscv_iommu_process_cq_tail(RISCVIOMMUState *s) > if (cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV) { > /* illegal command arguments IOTINVAL.GVMA & PSCV == 1 */ > goto cmd_ill; > + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { > + /* invalidate all cache mappings */ > + func = __iot_inval_all; > + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { > + /* invalidate cache matching GSCID */ > + func = __iot_inval_gscid; > + } else { > + /* invalidate cache matching GSCID and ADDR (GPA) */ > + func = __iot_inval_gscid_gpa; > } > - /* translation cache not implemented yet */ > + riscv_iommu_iot_inval(s, func, > + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), 0, > + cmd.dword1 & TARGET_PAGE_MASK); > break; > > case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA, > RISCV_IOMMU_CMD_IOTINVAL_OPCODE): > - /* translation cache not implemented yet */ > + if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { > + /* invalidate all cache mappings, simplified model */ > + func = __iot_inval_all; > + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV)) { > + /* invalidate cache matching GSCID, simplified model */ > + func = __iot_inval_gscid; > + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { > + /* invalidate cache matching GSCID and PSCID */ > + func = __iot_inval_pscid; > + } else { > + /* invalidate cache matching GSCID and PSCID and ADDR (IOVA) */ > + func = __iot_inval_pscid_iova; > + } > + riscv_iommu_iot_inval(s, func, > + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), > + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_PSCID), > + cmd.dword1 & TARGET_PAGE_MASK); > break; > > case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT, > @@ -1824,6 +2008,10 @@ static void riscv_iommu_realize(DeviceState *dev, Error **errp) > g_free, NULL); > qemu_mutex_init(&s->ctx_lock); > > + s->iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, > + g_free, NULL); > + qemu_mutex_init(&s->iot_lock); > + > s->iommus.le_next = NULL; > s->iommus.le_prev = NULL; > QLIST_INIT(&s->spaces); > @@ -1836,6 +2024,7 @@ static void riscv_iommu_unrealize(DeviceState *dev) > RISCVIOMMUState *s = RISCV_IOMMU(dev); > > qemu_mutex_destroy(&s->core_lock); > + g_hash_table_unref(s->iot_cache); > g_hash_table_unref(s->ctx_cache); > } > > @@ -1843,6 +2032,8 @@ 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_UINT32("ioatc-limit", RISCVIOMMUState, iot_limit, > + LIMIT_CACHE_IOT), > 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), > @@ -1897,7 +2088,7 @@ static IOMMUTLBEntry riscv_iommu_memory_region_translate( > /* Translation disabled or invalid. */ > iotlb.addr_mask = 0; > iotlb.perm = IOMMU_NONE; > - } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb)) { > + } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb, true)) { > /* Translation disabled or fault reported. */ > iotlb.addr_mask = 0; > iotlb.perm = IOMMU_NONE; > diff --git a/hw/riscv/riscv-iommu.h b/hw/riscv/riscv-iommu.h > index 6d76cb9b1a..c917b6219a 100644 > --- a/hw/riscv/riscv-iommu.h > +++ b/hw/riscv/riscv-iommu.h > @@ -75,6 +75,9 @@ struct RISCVIOMMUState { > > GHashTable *ctx_cache; /* Device translation Context Cache */ > QemuMutex ctx_lock; /* Device translation Cache update lock */ > + GHashTable *iot_cache; /* IO Translated Address Cache */ > + QemuMutex iot_lock; /* IO TLB Cache update lock */ > + unsigned iot_limit; /* IO Translation Cache size limit */ > > /* MMIO Hardware Interface */ > MemoryRegion regs_mr;
On 8/20/24 12:27 PM, Jason Chien wrote: > Hi Daniel, > > On 2024/8/1 下午 11:43, Daniel Henrique Barboza wrote: >> From: Tomasz Jeznach <tjeznach@rivosinc.com> >> >> The RISC-V IOMMU spec predicts that the IOMMU can use translation caches >> to hold entries from the DDT. This includes implementation for all cache >> commands that are marked as 'not implemented'. >> >> There are some artifacts included in the cache that predicts s-stage and >> g-stage elements, although we don't support it yet. We'll introduce them >> next. >> >> Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com> >> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> >> Reviewed-by: Frank Chang <frank.chang@sifive.com> >> Acked-by: Alistair Francis <alistair.francis@wdc.com> >> --- >> hw/riscv/riscv-iommu.c | 199 ++++++++++++++++++++++++++++++++++++++++- >> hw/riscv/riscv-iommu.h | 3 + >> 2 files changed, 198 insertions(+), 4 deletions(-) >> >> diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c >> index ebe3a53a04..3816e6a493 100644 >> --- a/hw/riscv/riscv-iommu.c >> +++ b/hw/riscv/riscv-iommu.c >> @@ -65,6 +65,16 @@ struct RISCVIOMMUContext { >> uint64_t msiptp; /* MSI redirection page table pointer */ >> }; >> +/* Address translation cache entry */ >> +struct RISCVIOMMUEntry { >> + uint64_t iova:44; /* IOVA Page Number */ >> + uint64_t pscid:20; /* Process Soft-Context identifier */ >> + uint64_t phys:44; /* Physical Page Number */ >> + uint64_t gscid:16; /* Guest Soft-Context identifier */ >> + uint64_t perm:2; /* IOMMU_RW flags */ >> + uint64_t __rfu:2; >> +}; >> + >> /* IOMMU index for transactions without process_id specified. */ >> #define RISCV_IOMMU_NOPROCID 0 >> @@ -1138,13 +1148,130 @@ static AddressSpace *riscv_iommu_space(RISCVIOMMUState *s, uint32_t devid) >> return &as->iova_as; >> } >> +/* Translation Object cache support */ >> +static gboolean __iot_equal(gconstpointer v1, gconstpointer v2) >> +{ >> + RISCVIOMMUEntry *t1 = (RISCVIOMMUEntry *) v1; >> + RISCVIOMMUEntry *t2 = (RISCVIOMMUEntry *) v2; >> + return t1->gscid == t2->gscid && t1->pscid == t2->pscid && >> + t1->iova == t2->iova; >> +} >> + >> +static guint __iot_hash(gconstpointer v) >> +{ >> + RISCVIOMMUEntry *t = (RISCVIOMMUEntry *) v; >> + return (guint)t->iova; >> +} >> + >> +/* GV: 1 PSCV: 1 AV: 1 */ >> +static void __iot_inval_pscid_iova(gpointer key, gpointer value, gpointer data) >> +{ >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >> + if (iot->gscid == arg->gscid && >> + iot->pscid == arg->pscid && >> + iot->iova == arg->iova) { >> + iot->perm = IOMMU_NONE; >> + } >> +} >> + >> +/* GV: 1 PSCV: 1 AV: 0 */ >> +static void __iot_inval_pscid(gpointer key, gpointer value, gpointer data) >> +{ >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >> + if (iot->gscid == arg->gscid && >> + iot->pscid == arg->pscid) { >> + iot->perm = IOMMU_NONE; >> + } >> +} >> + >> +/* GV: 1 GVMA: 1 */ >> +static void __iot_inval_gscid_gpa(gpointer key, gpointer value, gpointer data) >> +{ >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >> + if (iot->gscid == arg->gscid) { >> + /* simplified cache, no GPA matching */ >> + iot->perm = IOMMU_NONE; >> + } >> +} >> + >> +/* GV: 1 GVMA: 0 */ >> +static void __iot_inval_gscid(gpointer key, gpointer value, gpointer data) >> +{ >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >> + if (iot->gscid == arg->gscid) { >> + iot->perm = IOMMU_NONE; >> + } >> +} >> + >> +/* GV: 0 */ >> +static void __iot_inval_all(gpointer key, gpointer value, gpointer data) >> +{ >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >> + iot->perm = IOMMU_NONE; >> +} >> + >> +/* caller should keep ref-count for iot_cache object */ >> +static RISCVIOMMUEntry *riscv_iommu_iot_lookup(RISCVIOMMUContext *ctx, >> + GHashTable *iot_cache, hwaddr iova) >> +{ >> + RISCVIOMMUEntry key = { >> + .gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID), >> + .pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID), >> + .iova = PPN_DOWN(iova), >> + }; >> + return g_hash_table_lookup(iot_cache, &key); >> +} >> + >> +/* caller should keep ref-count for iot_cache object */ >> +static void riscv_iommu_iot_update(RISCVIOMMUState *s, >> + GHashTable *iot_cache, RISCVIOMMUEntry *iot) >> +{ >> + if (!s->iot_limit) { >> + return; >> + } >> + >> + qemu_mutex_lock(&s->iot_lock); >> + if (g_hash_table_size(s->iot_cache) >= s->iot_limit) { >> + iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, >> + g_free, NULL); >> + g_hash_table_unref(qatomic_xchg(&s->iot_cache, iot_cache)); >> + } >> + g_hash_table_add(iot_cache, iot); >> + qemu_mutex_unlock(&s->iot_lock); >> +} >> + >> +static void riscv_iommu_iot_inval(RISCVIOMMUState *s, GHFunc func, >> + uint32_t gscid, uint32_t pscid, hwaddr iova) >> +{ >> + GHashTable *iot_cache; >> + RISCVIOMMUEntry key = { >> + .gscid = gscid, >> + .pscid = pscid, >> + .iova = PPN_DOWN(iova), >> + }; >> + >> + iot_cache = g_hash_table_ref(s->iot_cache); >> + qemu_mutex_lock(&s->iot_lock); >> + g_hash_table_foreach(iot_cache, func, &key); >> + qemu_mutex_unlock(&s->iot_lock); >> + g_hash_table_unref(iot_cache); >> +} >> + >> static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, >> - IOMMUTLBEntry *iotlb) >> + IOMMUTLBEntry *iotlb, bool enable_cache) >> { >> + RISCVIOMMUEntry *iot; >> + IOMMUAccessFlags perm; >> bool enable_pid; >> bool enable_pri; >> + GHashTable *iot_cache; >> int fault; >> + iot_cache = g_hash_table_ref(s->iot_cache); >> /* >> * TC[32] is reserved for custom extensions, used here to temporarily >> * enable automatic page-request generation for ATS queries. >> @@ -1152,9 +1279,39 @@ static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, >> enable_pri = (iotlb->perm == IOMMU_NONE) && (ctx->tc & BIT_ULL(32)); >> enable_pid = (ctx->tc & RISCV_IOMMU_DC_TC_PDTV); >> + qemu_mutex_lock(&s->iot_lock); >> + iot = riscv_iommu_iot_lookup(ctx, iot_cache, iotlb->iova); >> + qemu_mutex_unlock(&s->iot_lock); >> + perm = iot ? iot->perm : IOMMU_NONE; >> + if (perm != IOMMU_NONE) { >> + iotlb->translated_addr = PPN_PHYS(iot->phys); >> + iotlb->addr_mask = ~TARGET_PAGE_MASK; >> + iotlb->perm = perm; >> + fault = 0; >> + goto done; >> + } >> + >> /* Translate using device directory / page table information. */ >> fault = riscv_iommu_spa_fetch(s, ctx, iotlb); >> + if (!fault && iotlb->target_as == &s->trap_as) { >> + /* Do not cache trapped MSI translations */ >> + goto done; >> + } >> + >> + if (!fault && iotlb->translated_addr != iotlb->iova && enable_cache) { > Shouldn't addresses which don't need to be translated also be cached? I think it doesn't hurt to cache these addresses too. Just updated the check to: if (!fault && enable_cache) { Thanks, Daniel >> + iot = g_new0(RISCVIOMMUEntry, 1); >> + iot->iova = PPN_DOWN(iotlb->iova); >> + iot->phys = PPN_DOWN(iotlb->translated_addr); >> + iot->gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID); >> + iot->pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID); >> + iot->perm = iotlb->perm; >> + riscv_iommu_iot_update(s, iot_cache, iot); >> + } >> + >> +done: >> + g_hash_table_unref(iot_cache); >> + >> if (enable_pri && fault) { >> struct riscv_iommu_pq_record pr = {0}; >> if (enable_pid) { >> @@ -1294,13 +1451,40 @@ static void riscv_iommu_process_cq_tail(RISCVIOMMUState *s) >> if (cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV) { >> /* illegal command arguments IOTINVAL.GVMA & PSCV == 1 */ >> goto cmd_ill; >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { >> + /* invalidate all cache mappings */ >> + func = __iot_inval_all; >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { >> + /* invalidate cache matching GSCID */ >> + func = __iot_inval_gscid; >> + } else { >> + /* invalidate cache matching GSCID and ADDR (GPA) */ >> + func = __iot_inval_gscid_gpa; >> } >> - /* translation cache not implemented yet */ >> + riscv_iommu_iot_inval(s, func, >> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), 0, >> + cmd.dword1 & TARGET_PAGE_MASK); >> break; >> case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA, >> RISCV_IOMMU_CMD_IOTINVAL_OPCODE): >> - /* translation cache not implemented yet */ >> + if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { >> + /* invalidate all cache mappings, simplified model */ >> + func = __iot_inval_all; >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV)) { >> + /* invalidate cache matching GSCID, simplified model */ >> + func = __iot_inval_gscid; >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { >> + /* invalidate cache matching GSCID and PSCID */ >> + func = __iot_inval_pscid; >> + } else { >> + /* invalidate cache matching GSCID and PSCID and ADDR (IOVA) */ >> + func = __iot_inval_pscid_iova; >> + } >> + riscv_iommu_iot_inval(s, func, >> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), >> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_PSCID), >> + cmd.dword1 & TARGET_PAGE_MASK); >> break; >> case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT, >> @@ -1824,6 +2008,10 @@ static void riscv_iommu_realize(DeviceState *dev, Error **errp) >> g_free, NULL); >> qemu_mutex_init(&s->ctx_lock); >> + s->iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, >> + g_free, NULL); >> + qemu_mutex_init(&s->iot_lock); >> + >> s->iommus.le_next = NULL; >> s->iommus.le_prev = NULL; >> QLIST_INIT(&s->spaces); >> @@ -1836,6 +2024,7 @@ static void riscv_iommu_unrealize(DeviceState *dev) >> RISCVIOMMUState *s = RISCV_IOMMU(dev); >> qemu_mutex_destroy(&s->core_lock); >> + g_hash_table_unref(s->iot_cache); >> g_hash_table_unref(s->ctx_cache); >> } >> @@ -1843,6 +2032,8 @@ 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_UINT32("ioatc-limit", RISCVIOMMUState, iot_limit, >> + LIMIT_CACHE_IOT), >> 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), >> @@ -1897,7 +2088,7 @@ static IOMMUTLBEntry riscv_iommu_memory_region_translate( >> /* Translation disabled or invalid. */ >> iotlb.addr_mask = 0; >> iotlb.perm = IOMMU_NONE; >> - } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb)) { >> + } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb, true)) { >> /* Translation disabled or fault reported. */ >> iotlb.addr_mask = 0; >> iotlb.perm = IOMMU_NONE; >> diff --git a/hw/riscv/riscv-iommu.h b/hw/riscv/riscv-iommu.h >> index 6d76cb9b1a..c917b6219a 100644 >> --- a/hw/riscv/riscv-iommu.h >> +++ b/hw/riscv/riscv-iommu.h >> @@ -75,6 +75,9 @@ struct RISCVIOMMUState { >> GHashTable *ctx_cache; /* Device translation Context Cache */ >> QemuMutex ctx_lock; /* Device translation Cache update lock */ >> + GHashTable *iot_cache; /* IO Translated Address Cache */ >> + QemuMutex iot_lock; /* IO TLB Cache update lock */ >> + unsigned iot_limit; /* IO Translation Cache size limit */ >> /* MMIO Hardware Interface */ >> MemoryRegion regs_mr;
On Fri, Aug 23, 2024 at 10:18 AM Daniel Henrique Barboza <dbarboza@ventanamicro.com> wrote: > > > > On 8/20/24 12:27 PM, Jason Chien wrote: > > Hi Daniel, > > > > On 2024/8/1 下午 11:43, Daniel Henrique Barboza wrote: > >> From: Tomasz Jeznach <tjeznach@rivosinc.com> > >> > >> The RISC-V IOMMU spec predicts that the IOMMU can use translation caches > >> to hold entries from the DDT. This includes implementation for all cache > >> commands that are marked as 'not implemented'. > >> > >> There are some artifacts included in the cache that predicts s-stage and > >> g-stage elements, although we don't support it yet. We'll introduce them > >> next. > >> > >> Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com> > >> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> > >> Reviewed-by: Frank Chang <frank.chang@sifive.com> > >> Acked-by: Alistair Francis <alistair.francis@wdc.com> > >> --- > >> hw/riscv/riscv-iommu.c | 199 ++++++++++++++++++++++++++++++++++++++++- > >> hw/riscv/riscv-iommu.h | 3 + > >> 2 files changed, 198 insertions(+), 4 deletions(-) > >> > >> diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c > >> index ebe3a53a04..3816e6a493 100644 > >> --- a/hw/riscv/riscv-iommu.c > >> +++ b/hw/riscv/riscv-iommu.c > >> @@ -65,6 +65,16 @@ struct RISCVIOMMUContext { > >> uint64_t msiptp; /* MSI redirection page table pointer */ > >> }; > >> +/* Address translation cache entry */ > >> +struct RISCVIOMMUEntry { > >> + uint64_t iova:44; /* IOVA Page Number */ > >> + uint64_t pscid:20; /* Process Soft-Context identifier */ > >> + uint64_t phys:44; /* Physical Page Number */ > >> + uint64_t gscid:16; /* Guest Soft-Context identifier */ > >> + uint64_t perm:2; /* IOMMU_RW flags */ > >> + uint64_t __rfu:2; > >> +}; > >> + > >> /* IOMMU index for transactions without process_id specified. */ > >> #define RISCV_IOMMU_NOPROCID 0 > >> @@ -1138,13 +1148,130 @@ static AddressSpace *riscv_iommu_space(RISCVIOMMUState *s, uint32_t devid) > >> return &as->iova_as; > >> } > >> +/* Translation Object cache support */ > >> +static gboolean __iot_equal(gconstpointer v1, gconstpointer v2) > >> +{ > >> + RISCVIOMMUEntry *t1 = (RISCVIOMMUEntry *) v1; > >> + RISCVIOMMUEntry *t2 = (RISCVIOMMUEntry *) v2; > >> + return t1->gscid == t2->gscid && t1->pscid == t2->pscid && > >> + t1->iova == t2->iova; > >> +} > >> + > >> +static guint __iot_hash(gconstpointer v) > >> +{ > >> + RISCVIOMMUEntry *t = (RISCVIOMMUEntry *) v; > >> + return (guint)t->iova; > >> +} > >> + > >> +/* GV: 1 PSCV: 1 AV: 1 */ > >> +static void __iot_inval_pscid_iova(gpointer key, gpointer value, gpointer data) > >> +{ > >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > >> + if (iot->gscid == arg->gscid && > >> + iot->pscid == arg->pscid && > >> + iot->iova == arg->iova) { > >> + iot->perm = IOMMU_NONE; > >> + } > >> +} > >> + > >> +/* GV: 1 PSCV: 1 AV: 0 */ > >> +static void __iot_inval_pscid(gpointer key, gpointer value, gpointer data) > >> +{ > >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > >> + if (iot->gscid == arg->gscid && > >> + iot->pscid == arg->pscid) { > >> + iot->perm = IOMMU_NONE; > >> + } > >> +} > >> + > >> +/* GV: 1 GVMA: 1 */ > >> +static void __iot_inval_gscid_gpa(gpointer key, gpointer value, gpointer data) > >> +{ > >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > >> + if (iot->gscid == arg->gscid) { > >> + /* simplified cache, no GPA matching */ > >> + iot->perm = IOMMU_NONE; > >> + } > >> +} > >> + > >> +/* GV: 1 GVMA: 0 */ > >> +static void __iot_inval_gscid(gpointer key, gpointer value, gpointer data) > >> +{ > >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > >> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; > >> + if (iot->gscid == arg->gscid) { > >> + iot->perm = IOMMU_NONE; > >> + } > >> +} > >> + > >> +/* GV: 0 */ > >> +static void __iot_inval_all(gpointer key, gpointer value, gpointer data) > >> +{ > >> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; > >> + iot->perm = IOMMU_NONE; > >> +} > >> + > >> +/* caller should keep ref-count for iot_cache object */ > >> +static RISCVIOMMUEntry *riscv_iommu_iot_lookup(RISCVIOMMUContext *ctx, > >> + GHashTable *iot_cache, hwaddr iova) > >> +{ > >> + RISCVIOMMUEntry key = { > >> + .gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID), > >> + .pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID), > >> + .iova = PPN_DOWN(iova), > >> + }; > >> + return g_hash_table_lookup(iot_cache, &key); > >> +} > >> + > >> +/* caller should keep ref-count for iot_cache object */ > >> +static void riscv_iommu_iot_update(RISCVIOMMUState *s, > >> + GHashTable *iot_cache, RISCVIOMMUEntry *iot) > >> +{ > >> + if (!s->iot_limit) { > >> + return; > >> + } > >> + > >> + qemu_mutex_lock(&s->iot_lock); > >> + if (g_hash_table_size(s->iot_cache) >= s->iot_limit) { > >> + iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, > >> + g_free, NULL); > >> + g_hash_table_unref(qatomic_xchg(&s->iot_cache, iot_cache)); > >> + } > >> + g_hash_table_add(iot_cache, iot); > >> + qemu_mutex_unlock(&s->iot_lock); > >> +} > >> + > >> +static void riscv_iommu_iot_inval(RISCVIOMMUState *s, GHFunc func, > >> + uint32_t gscid, uint32_t pscid, hwaddr iova) > >> +{ > >> + GHashTable *iot_cache; > >> + RISCVIOMMUEntry key = { > >> + .gscid = gscid, > >> + .pscid = pscid, > >> + .iova = PPN_DOWN(iova), > >> + }; > >> + > >> + iot_cache = g_hash_table_ref(s->iot_cache); > >> + qemu_mutex_lock(&s->iot_lock); > >> + g_hash_table_foreach(iot_cache, func, &key); > >> + qemu_mutex_unlock(&s->iot_lock); > >> + g_hash_table_unref(iot_cache); > >> +} > >> + > >> static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, > >> - IOMMUTLBEntry *iotlb) > >> + IOMMUTLBEntry *iotlb, bool enable_cache) > >> { > >> + RISCVIOMMUEntry *iot; > >> + IOMMUAccessFlags perm; > >> bool enable_pid; > >> bool enable_pri; > >> + GHashTable *iot_cache; > >> int fault; > >> + iot_cache = g_hash_table_ref(s->iot_cache); > >> /* > >> * TC[32] is reserved for custom extensions, used here to temporarily > >> * enable automatic page-request generation for ATS queries. > >> @@ -1152,9 +1279,39 @@ static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, > >> enable_pri = (iotlb->perm == IOMMU_NONE) && (ctx->tc & BIT_ULL(32)); > >> enable_pid = (ctx->tc & RISCV_IOMMU_DC_TC_PDTV); > >> + qemu_mutex_lock(&s->iot_lock); > >> + iot = riscv_iommu_iot_lookup(ctx, iot_cache, iotlb->iova); > >> + qemu_mutex_unlock(&s->iot_lock); > >> + perm = iot ? iot->perm : IOMMU_NONE; > >> + if (perm != IOMMU_NONE) { > >> + iotlb->translated_addr = PPN_PHYS(iot->phys); > >> + iotlb->addr_mask = ~TARGET_PAGE_MASK; > >> + iotlb->perm = perm; > >> + fault = 0; > >> + goto done; > >> + } > >> + > >> /* Translate using device directory / page table information. */ > >> fault = riscv_iommu_spa_fetch(s, ctx, iotlb); > >> + if (!fault && iotlb->target_as == &s->trap_as) { > >> + /* Do not cache trapped MSI translations */ > >> + goto done; > >> + } > >> + > >> + if (!fault && iotlb->translated_addr != iotlb->iova && enable_cache) { > > Shouldn't addresses which don't need to be translated also be cached? > > I think it doesn't hurt to cache these addresses too. Just updated the check to: > > if (!fault && enable_cache) { > > Note: It was an implementation choice to not cache identity-mapped translations, as allowed by the specification, to avoid translation cache evictions for other devices sharing the IOMMU hardware model. Unless there is a strong reason to enable IOATC here, I'd suggest not caching such entries. Thanks, - Tomasz > > Thanks, > > Daniel > > > >> + iot = g_new0(RISCVIOMMUEntry, 1); > >> + iot->iova = PPN_DOWN(iotlb->iova); > >> + iot->phys = PPN_DOWN(iotlb->translated_addr); > >> + iot->gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID); > >> + iot->pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID); > >> + iot->perm = iotlb->perm; > >> + riscv_iommu_iot_update(s, iot_cache, iot); > >> + } > >> + > >> +done: > >> + g_hash_table_unref(iot_cache); > >> + > >> if (enable_pri && fault) { > >> struct riscv_iommu_pq_record pr = {0}; > >> if (enable_pid) { > >> @@ -1294,13 +1451,40 @@ static void riscv_iommu_process_cq_tail(RISCVIOMMUState *s) > >> if (cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV) { > >> /* illegal command arguments IOTINVAL.GVMA & PSCV == 1 */ > >> goto cmd_ill; > >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { > >> + /* invalidate all cache mappings */ > >> + func = __iot_inval_all; > >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { > >> + /* invalidate cache matching GSCID */ > >> + func = __iot_inval_gscid; > >> + } else { > >> + /* invalidate cache matching GSCID and ADDR (GPA) */ > >> + func = __iot_inval_gscid_gpa; > >> } > >> - /* translation cache not implemented yet */ > >> + riscv_iommu_iot_inval(s, func, > >> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), 0, > >> + cmd.dword1 & TARGET_PAGE_MASK); > >> break; > >> case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA, > >> RISCV_IOMMU_CMD_IOTINVAL_OPCODE): > >> - /* translation cache not implemented yet */ > >> + if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { > >> + /* invalidate all cache mappings, simplified model */ > >> + func = __iot_inval_all; > >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV)) { > >> + /* invalidate cache matching GSCID, simplified model */ > >> + func = __iot_inval_gscid; > >> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { > >> + /* invalidate cache matching GSCID and PSCID */ > >> + func = __iot_inval_pscid; > >> + } else { > >> + /* invalidate cache matching GSCID and PSCID and ADDR (IOVA) */ > >> + func = __iot_inval_pscid_iova; > >> + } > >> + riscv_iommu_iot_inval(s, func, > >> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), > >> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_PSCID), > >> + cmd.dword1 & TARGET_PAGE_MASK); > >> break; > >> case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT, > >> @@ -1824,6 +2008,10 @@ static void riscv_iommu_realize(DeviceState *dev, Error **errp) > >> g_free, NULL); > >> qemu_mutex_init(&s->ctx_lock); > >> + s->iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, > >> + g_free, NULL); > >> + qemu_mutex_init(&s->iot_lock); > >> + > >> s->iommus.le_next = NULL; > >> s->iommus.le_prev = NULL; > >> QLIST_INIT(&s->spaces); > >> @@ -1836,6 +2024,7 @@ static void riscv_iommu_unrealize(DeviceState *dev) > >> RISCVIOMMUState *s = RISCV_IOMMU(dev); > >> qemu_mutex_destroy(&s->core_lock); > >> + g_hash_table_unref(s->iot_cache); > >> g_hash_table_unref(s->ctx_cache); > >> } > >> @@ -1843,6 +2032,8 @@ 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_UINT32("ioatc-limit", RISCVIOMMUState, iot_limit, > >> + LIMIT_CACHE_IOT), > >> 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), > >> @@ -1897,7 +2088,7 @@ static IOMMUTLBEntry riscv_iommu_memory_region_translate( > >> /* Translation disabled or invalid. */ > >> iotlb.addr_mask = 0; > >> iotlb.perm = IOMMU_NONE; > >> - } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb)) { > >> + } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb, true)) { > >> /* Translation disabled or fault reported. */ > >> iotlb.addr_mask = 0; > >> iotlb.perm = IOMMU_NONE; > >> diff --git a/hw/riscv/riscv-iommu.h b/hw/riscv/riscv-iommu.h > >> index 6d76cb9b1a..c917b6219a 100644 > >> --- a/hw/riscv/riscv-iommu.h > >> +++ b/hw/riscv/riscv-iommu.h > >> @@ -75,6 +75,9 @@ struct RISCVIOMMUState { > >> GHashTable *ctx_cache; /* Device translation Context Cache */ > >> QemuMutex ctx_lock; /* Device translation Cache update lock */ > >> + GHashTable *iot_cache; /* IO Translated Address Cache */ > >> + QemuMutex iot_lock; /* IO TLB Cache update lock */ > >> + unsigned iot_limit; /* IO Translation Cache size limit */ > >> /* MMIO Hardware Interface */ > >> MemoryRegion regs_mr;
On 8/26/24 11:44 PM, Tomasz Jeznach wrote: > On Fri, Aug 23, 2024 at 10:18 AM Daniel Henrique Barboza > <dbarboza@ventanamicro.com> wrote: >> >> >> >> On 8/20/24 12:27 PM, Jason Chien wrote: >>> Hi Daniel, >>> >>> On 2024/8/1 下午 11:43, Daniel Henrique Barboza wrote: >>>> From: Tomasz Jeznach <tjeznach@rivosinc.com> >>>> >>>> The RISC-V IOMMU spec predicts that the IOMMU can use translation caches >>>> to hold entries from the DDT. This includes implementation for all cache >>>> commands that are marked as 'not implemented'. >>>> >>>> There are some artifacts included in the cache that predicts s-stage and >>>> g-stage elements, although we don't support it yet. We'll introduce them >>>> next. >>>> >>>> Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com> >>>> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> >>>> Reviewed-by: Frank Chang <frank.chang@sifive.com> >>>> Acked-by: Alistair Francis <alistair.francis@wdc.com> >>>> --- >>>> hw/riscv/riscv-iommu.c | 199 ++++++++++++++++++++++++++++++++++++++++- >>>> hw/riscv/riscv-iommu.h | 3 + >>>> 2 files changed, 198 insertions(+), 4 deletions(-) >>>> >>>> diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c >>>> index ebe3a53a04..3816e6a493 100644 >>>> --- a/hw/riscv/riscv-iommu.c >>>> +++ b/hw/riscv/riscv-iommu.c >>>> @@ -65,6 +65,16 @@ struct RISCVIOMMUContext { >>>> uint64_t msiptp; /* MSI redirection page table pointer */ >>>> }; >>>> +/* Address translation cache entry */ >>>> +struct RISCVIOMMUEntry { >>>> + uint64_t iova:44; /* IOVA Page Number */ >>>> + uint64_t pscid:20; /* Process Soft-Context identifier */ >>>> + uint64_t phys:44; /* Physical Page Number */ >>>> + uint64_t gscid:16; /* Guest Soft-Context identifier */ >>>> + uint64_t perm:2; /* IOMMU_RW flags */ >>>> + uint64_t __rfu:2; >>>> +}; >>>> + >>>> /* IOMMU index for transactions without process_id specified. */ >>>> #define RISCV_IOMMU_NOPROCID 0 >>>> @@ -1138,13 +1148,130 @@ static AddressSpace *riscv_iommu_space(RISCVIOMMUState *s, uint32_t devid) >>>> return &as->iova_as; >>>> } >>>> +/* Translation Object cache support */ >>>> +static gboolean __iot_equal(gconstpointer v1, gconstpointer v2) >>>> +{ >>>> + RISCVIOMMUEntry *t1 = (RISCVIOMMUEntry *) v1; >>>> + RISCVIOMMUEntry *t2 = (RISCVIOMMUEntry *) v2; >>>> + return t1->gscid == t2->gscid && t1->pscid == t2->pscid && >>>> + t1->iova == t2->iova; >>>> +} >>>> + >>>> +static guint __iot_hash(gconstpointer v) >>>> +{ >>>> + RISCVIOMMUEntry *t = (RISCVIOMMUEntry *) v; >>>> + return (guint)t->iova; >>>> +} >>>> + >>>> +/* GV: 1 PSCV: 1 AV: 1 */ >>>> +static void __iot_inval_pscid_iova(gpointer key, gpointer value, gpointer data) >>>> +{ >>>> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >>>> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >>>> + if (iot->gscid == arg->gscid && >>>> + iot->pscid == arg->pscid && >>>> + iot->iova == arg->iova) { >>>> + iot->perm = IOMMU_NONE; >>>> + } >>>> +} >>>> + >>>> +/* GV: 1 PSCV: 1 AV: 0 */ >>>> +static void __iot_inval_pscid(gpointer key, gpointer value, gpointer data) >>>> +{ >>>> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >>>> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >>>> + if (iot->gscid == arg->gscid && >>>> + iot->pscid == arg->pscid) { >>>> + iot->perm = IOMMU_NONE; >>>> + } >>>> +} >>>> + >>>> +/* GV: 1 GVMA: 1 */ >>>> +static void __iot_inval_gscid_gpa(gpointer key, gpointer value, gpointer data) >>>> +{ >>>> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >>>> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >>>> + if (iot->gscid == arg->gscid) { >>>> + /* simplified cache, no GPA matching */ >>>> + iot->perm = IOMMU_NONE; >>>> + } >>>> +} >>>> + >>>> +/* GV: 1 GVMA: 0 */ >>>> +static void __iot_inval_gscid(gpointer key, gpointer value, gpointer data) >>>> +{ >>>> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >>>> + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; >>>> + if (iot->gscid == arg->gscid) { >>>> + iot->perm = IOMMU_NONE; >>>> + } >>>> +} >>>> + >>>> +/* GV: 0 */ >>>> +static void __iot_inval_all(gpointer key, gpointer value, gpointer data) >>>> +{ >>>> + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; >>>> + iot->perm = IOMMU_NONE; >>>> +} >>>> + >>>> +/* caller should keep ref-count for iot_cache object */ >>>> +static RISCVIOMMUEntry *riscv_iommu_iot_lookup(RISCVIOMMUContext *ctx, >>>> + GHashTable *iot_cache, hwaddr iova) >>>> +{ >>>> + RISCVIOMMUEntry key = { >>>> + .gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID), >>>> + .pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID), >>>> + .iova = PPN_DOWN(iova), >>>> + }; >>>> + return g_hash_table_lookup(iot_cache, &key); >>>> +} >>>> + >>>> +/* caller should keep ref-count for iot_cache object */ >>>> +static void riscv_iommu_iot_update(RISCVIOMMUState *s, >>>> + GHashTable *iot_cache, RISCVIOMMUEntry *iot) >>>> +{ >>>> + if (!s->iot_limit) { >>>> + return; >>>> + } >>>> + >>>> + qemu_mutex_lock(&s->iot_lock); >>>> + if (g_hash_table_size(s->iot_cache) >= s->iot_limit) { >>>> + iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, >>>> + g_free, NULL); >>>> + g_hash_table_unref(qatomic_xchg(&s->iot_cache, iot_cache)); >>>> + } >>>> + g_hash_table_add(iot_cache, iot); >>>> + qemu_mutex_unlock(&s->iot_lock); >>>> +} >>>> + >>>> +static void riscv_iommu_iot_inval(RISCVIOMMUState *s, GHFunc func, >>>> + uint32_t gscid, uint32_t pscid, hwaddr iova) >>>> +{ >>>> + GHashTable *iot_cache; >>>> + RISCVIOMMUEntry key = { >>>> + .gscid = gscid, >>>> + .pscid = pscid, >>>> + .iova = PPN_DOWN(iova), >>>> + }; >>>> + >>>> + iot_cache = g_hash_table_ref(s->iot_cache); >>>> + qemu_mutex_lock(&s->iot_lock); >>>> + g_hash_table_foreach(iot_cache, func, &key); >>>> + qemu_mutex_unlock(&s->iot_lock); >>>> + g_hash_table_unref(iot_cache); >>>> +} >>>> + >>>> static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, >>>> - IOMMUTLBEntry *iotlb) >>>> + IOMMUTLBEntry *iotlb, bool enable_cache) >>>> { >>>> + RISCVIOMMUEntry *iot; >>>> + IOMMUAccessFlags perm; >>>> bool enable_pid; >>>> bool enable_pri; >>>> + GHashTable *iot_cache; >>>> int fault; >>>> + iot_cache = g_hash_table_ref(s->iot_cache); >>>> /* >>>> * TC[32] is reserved for custom extensions, used here to temporarily >>>> * enable automatic page-request generation for ATS queries. >>>> @@ -1152,9 +1279,39 @@ static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, >>>> enable_pri = (iotlb->perm == IOMMU_NONE) && (ctx->tc & BIT_ULL(32)); >>>> enable_pid = (ctx->tc & RISCV_IOMMU_DC_TC_PDTV); >>>> + qemu_mutex_lock(&s->iot_lock); >>>> + iot = riscv_iommu_iot_lookup(ctx, iot_cache, iotlb->iova); >>>> + qemu_mutex_unlock(&s->iot_lock); >>>> + perm = iot ? iot->perm : IOMMU_NONE; >>>> + if (perm != IOMMU_NONE) { >>>> + iotlb->translated_addr = PPN_PHYS(iot->phys); >>>> + iotlb->addr_mask = ~TARGET_PAGE_MASK; >>>> + iotlb->perm = perm; >>>> + fault = 0; >>>> + goto done; >>>> + } >>>> + >>>> /* Translate using device directory / page table information. */ >>>> fault = riscv_iommu_spa_fetch(s, ctx, iotlb); >>>> + if (!fault && iotlb->target_as == &s->trap_as) { >>>> + /* Do not cache trapped MSI translations */ >>>> + goto done; >>>> + } >>>> + >>>> + if (!fault && iotlb->translated_addr != iotlb->iova && enable_cache) { >>> Shouldn't addresses which don't need to be translated also be cached? >> >> I think it doesn't hurt to cache these addresses too. Just updated the check to: >> >> if (!fault && enable_cache) { >> >> > > Note: It was an implementation choice to not cache identity-mapped > translations, as allowed by the specification, to avoid translation > cache evictions for other devices sharing the IOMMU hardware model. > Unless there is a strong reason to enable IOATC here, I'd suggest not > caching such entries. That's fair enough. Let's keep the restriction as is. I'll add a comment with this observation you made about being an implementation choice. Thanks, Daniel > > Thanks, > - Tomasz > >> >> Thanks, >> >> Daniel >> >> >>>> + iot = g_new0(RISCVIOMMUEntry, 1); >>>> + iot->iova = PPN_DOWN(iotlb->iova); >>>> + iot->phys = PPN_DOWN(iotlb->translated_addr); >>>> + iot->gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID); >>>> + iot->pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID); >>>> + iot->perm = iotlb->perm; >>>> + riscv_iommu_iot_update(s, iot_cache, iot); >>>> + } >>>> + >>>> +done: >>>> + g_hash_table_unref(iot_cache); >>>> + >>>> if (enable_pri && fault) { >>>> struct riscv_iommu_pq_record pr = {0}; >>>> if (enable_pid) { >>>> @@ -1294,13 +1451,40 @@ static void riscv_iommu_process_cq_tail(RISCVIOMMUState *s) >>>> if (cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV) { >>>> /* illegal command arguments IOTINVAL.GVMA & PSCV == 1 */ >>>> goto cmd_ill; >>>> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { >>>> + /* invalidate all cache mappings */ >>>> + func = __iot_inval_all; >>>> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { >>>> + /* invalidate cache matching GSCID */ >>>> + func = __iot_inval_gscid; >>>> + } else { >>>> + /* invalidate cache matching GSCID and ADDR (GPA) */ >>>> + func = __iot_inval_gscid_gpa; >>>> } >>>> - /* translation cache not implemented yet */ >>>> + riscv_iommu_iot_inval(s, func, >>>> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), 0, >>>> + cmd.dword1 & TARGET_PAGE_MASK); >>>> break; >>>> case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA, >>>> RISCV_IOMMU_CMD_IOTINVAL_OPCODE): >>>> - /* translation cache not implemented yet */ >>>> + if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { >>>> + /* invalidate all cache mappings, simplified model */ >>>> + func = __iot_inval_all; >>>> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV)) { >>>> + /* invalidate cache matching GSCID, simplified model */ >>>> + func = __iot_inval_gscid; >>>> + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { >>>> + /* invalidate cache matching GSCID and PSCID */ >>>> + func = __iot_inval_pscid; >>>> + } else { >>>> + /* invalidate cache matching GSCID and PSCID and ADDR (IOVA) */ >>>> + func = __iot_inval_pscid_iova; >>>> + } >>>> + riscv_iommu_iot_inval(s, func, >>>> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), >>>> + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_PSCID), >>>> + cmd.dword1 & TARGET_PAGE_MASK); >>>> break; >>>> case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT, >>>> @@ -1824,6 +2008,10 @@ static void riscv_iommu_realize(DeviceState *dev, Error **errp) >>>> g_free, NULL); >>>> qemu_mutex_init(&s->ctx_lock); >>>> + s->iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, >>>> + g_free, NULL); >>>> + qemu_mutex_init(&s->iot_lock); >>>> + >>>> s->iommus.le_next = NULL; >>>> s->iommus.le_prev = NULL; >>>> QLIST_INIT(&s->spaces); >>>> @@ -1836,6 +2024,7 @@ static void riscv_iommu_unrealize(DeviceState *dev) >>>> RISCVIOMMUState *s = RISCV_IOMMU(dev); >>>> qemu_mutex_destroy(&s->core_lock); >>>> + g_hash_table_unref(s->iot_cache); >>>> g_hash_table_unref(s->ctx_cache); >>>> } >>>> @@ -1843,6 +2032,8 @@ 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_UINT32("ioatc-limit", RISCVIOMMUState, iot_limit, >>>> + LIMIT_CACHE_IOT), >>>> 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), >>>> @@ -1897,7 +2088,7 @@ static IOMMUTLBEntry riscv_iommu_memory_region_translate( >>>> /* Translation disabled or invalid. */ >>>> iotlb.addr_mask = 0; >>>> iotlb.perm = IOMMU_NONE; >>>> - } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb)) { >>>> + } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb, true)) { >>>> /* Translation disabled or fault reported. */ >>>> iotlb.addr_mask = 0; >>>> iotlb.perm = IOMMU_NONE; >>>> diff --git a/hw/riscv/riscv-iommu.h b/hw/riscv/riscv-iommu.h >>>> index 6d76cb9b1a..c917b6219a 100644 >>>> --- a/hw/riscv/riscv-iommu.h >>>> +++ b/hw/riscv/riscv-iommu.h >>>> @@ -75,6 +75,9 @@ struct RISCVIOMMUState { >>>> GHashTable *ctx_cache; /* Device translation Context Cache */ >>>> QemuMutex ctx_lock; /* Device translation Cache update lock */ >>>> + GHashTable *iot_cache; /* IO Translated Address Cache */ >>>> + QemuMutex iot_lock; /* IO TLB Cache update lock */ >>>> + unsigned iot_limit; /* IO Translation Cache size limit */ >>>> /* MMIO Hardware Interface */ >>>> MemoryRegion regs_mr;
diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c index ebe3a53a04..3816e6a493 100644 --- a/hw/riscv/riscv-iommu.c +++ b/hw/riscv/riscv-iommu.c @@ -65,6 +65,16 @@ struct RISCVIOMMUContext { uint64_t msiptp; /* MSI redirection page table pointer */ }; +/* Address translation cache entry */ +struct RISCVIOMMUEntry { + uint64_t iova:44; /* IOVA Page Number */ + uint64_t pscid:20; /* Process Soft-Context identifier */ + uint64_t phys:44; /* Physical Page Number */ + uint64_t gscid:16; /* Guest Soft-Context identifier */ + uint64_t perm:2; /* IOMMU_RW flags */ + uint64_t __rfu:2; +}; + /* IOMMU index for transactions without process_id specified. */ #define RISCV_IOMMU_NOPROCID 0 @@ -1138,13 +1148,130 @@ static AddressSpace *riscv_iommu_space(RISCVIOMMUState *s, uint32_t devid) return &as->iova_as; } +/* Translation Object cache support */ +static gboolean __iot_equal(gconstpointer v1, gconstpointer v2) +{ + RISCVIOMMUEntry *t1 = (RISCVIOMMUEntry *) v1; + RISCVIOMMUEntry *t2 = (RISCVIOMMUEntry *) v2; + return t1->gscid == t2->gscid && t1->pscid == t2->pscid && + t1->iova == t2->iova; +} + +static guint __iot_hash(gconstpointer v) +{ + RISCVIOMMUEntry *t = (RISCVIOMMUEntry *) v; + return (guint)t->iova; +} + +/* GV: 1 PSCV: 1 AV: 1 */ +static void __iot_inval_pscid_iova(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->gscid == arg->gscid && + iot->pscid == arg->pscid && + iot->iova == arg->iova) { + iot->perm = IOMMU_NONE; + } +} + +/* GV: 1 PSCV: 1 AV: 0 */ +static void __iot_inval_pscid(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->gscid == arg->gscid && + iot->pscid == arg->pscid) { + iot->perm = IOMMU_NONE; + } +} + +/* GV: 1 GVMA: 1 */ +static void __iot_inval_gscid_gpa(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->gscid == arg->gscid) { + /* simplified cache, no GPA matching */ + iot->perm = IOMMU_NONE; + } +} + +/* GV: 1 GVMA: 0 */ +static void __iot_inval_gscid(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->gscid == arg->gscid) { + iot->perm = IOMMU_NONE; + } +} + +/* GV: 0 */ +static void __iot_inval_all(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + iot->perm = IOMMU_NONE; +} + +/* caller should keep ref-count for iot_cache object */ +static RISCVIOMMUEntry *riscv_iommu_iot_lookup(RISCVIOMMUContext *ctx, + GHashTable *iot_cache, hwaddr iova) +{ + RISCVIOMMUEntry key = { + .gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID), + .pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID), + .iova = PPN_DOWN(iova), + }; + return g_hash_table_lookup(iot_cache, &key); +} + +/* caller should keep ref-count for iot_cache object */ +static void riscv_iommu_iot_update(RISCVIOMMUState *s, + GHashTable *iot_cache, RISCVIOMMUEntry *iot) +{ + if (!s->iot_limit) { + return; + } + + qemu_mutex_lock(&s->iot_lock); + if (g_hash_table_size(s->iot_cache) >= s->iot_limit) { + iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, + g_free, NULL); + g_hash_table_unref(qatomic_xchg(&s->iot_cache, iot_cache)); + } + g_hash_table_add(iot_cache, iot); + qemu_mutex_unlock(&s->iot_lock); +} + +static void riscv_iommu_iot_inval(RISCVIOMMUState *s, GHFunc func, + uint32_t gscid, uint32_t pscid, hwaddr iova) +{ + GHashTable *iot_cache; + RISCVIOMMUEntry key = { + .gscid = gscid, + .pscid = pscid, + .iova = PPN_DOWN(iova), + }; + + iot_cache = g_hash_table_ref(s->iot_cache); + qemu_mutex_lock(&s->iot_lock); + g_hash_table_foreach(iot_cache, func, &key); + qemu_mutex_unlock(&s->iot_lock); + g_hash_table_unref(iot_cache); +} + static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, - IOMMUTLBEntry *iotlb) + IOMMUTLBEntry *iotlb, bool enable_cache) { + RISCVIOMMUEntry *iot; + IOMMUAccessFlags perm; bool enable_pid; bool enable_pri; + GHashTable *iot_cache; int fault; + iot_cache = g_hash_table_ref(s->iot_cache); /* * TC[32] is reserved for custom extensions, used here to temporarily * enable automatic page-request generation for ATS queries. @@ -1152,9 +1279,39 @@ static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, enable_pri = (iotlb->perm == IOMMU_NONE) && (ctx->tc & BIT_ULL(32)); enable_pid = (ctx->tc & RISCV_IOMMU_DC_TC_PDTV); + qemu_mutex_lock(&s->iot_lock); + iot = riscv_iommu_iot_lookup(ctx, iot_cache, iotlb->iova); + qemu_mutex_unlock(&s->iot_lock); + perm = iot ? iot->perm : IOMMU_NONE; + if (perm != IOMMU_NONE) { + iotlb->translated_addr = PPN_PHYS(iot->phys); + iotlb->addr_mask = ~TARGET_PAGE_MASK; + iotlb->perm = perm; + fault = 0; + goto done; + } + /* Translate using device directory / page table information. */ fault = riscv_iommu_spa_fetch(s, ctx, iotlb); + if (!fault && iotlb->target_as == &s->trap_as) { + /* Do not cache trapped MSI translations */ + goto done; + } + + if (!fault && iotlb->translated_addr != iotlb->iova && enable_cache) { + iot = g_new0(RISCVIOMMUEntry, 1); + iot->iova = PPN_DOWN(iotlb->iova); + iot->phys = PPN_DOWN(iotlb->translated_addr); + iot->gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID); + iot->pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID); + iot->perm = iotlb->perm; + riscv_iommu_iot_update(s, iot_cache, iot); + } + +done: + g_hash_table_unref(iot_cache); + if (enable_pri && fault) { struct riscv_iommu_pq_record pr = {0}; if (enable_pid) { @@ -1294,13 +1451,40 @@ static void riscv_iommu_process_cq_tail(RISCVIOMMUState *s) if (cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV) { /* illegal command arguments IOTINVAL.GVMA & PSCV == 1 */ goto cmd_ill; + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { + /* invalidate all cache mappings */ + func = __iot_inval_all; + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { + /* invalidate cache matching GSCID */ + func = __iot_inval_gscid; + } else { + /* invalidate cache matching GSCID and ADDR (GPA) */ + func = __iot_inval_gscid_gpa; } - /* translation cache not implemented yet */ + riscv_iommu_iot_inval(s, func, + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), 0, + cmd.dword1 & TARGET_PAGE_MASK); break; case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA, RISCV_IOMMU_CMD_IOTINVAL_OPCODE): - /* translation cache not implemented yet */ + if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { + /* invalidate all cache mappings, simplified model */ + func = __iot_inval_all; + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV)) { + /* invalidate cache matching GSCID, simplified model */ + func = __iot_inval_gscid; + } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { + /* invalidate cache matching GSCID and PSCID */ + func = __iot_inval_pscid; + } else { + /* invalidate cache matching GSCID and PSCID and ADDR (IOVA) */ + func = __iot_inval_pscid_iova; + } + riscv_iommu_iot_inval(s, func, + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), + get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_PSCID), + cmd.dword1 & TARGET_PAGE_MASK); break; case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT, @@ -1824,6 +2008,10 @@ static void riscv_iommu_realize(DeviceState *dev, Error **errp) g_free, NULL); qemu_mutex_init(&s->ctx_lock); + s->iot_cache = g_hash_table_new_full(__iot_hash, __iot_equal, + g_free, NULL); + qemu_mutex_init(&s->iot_lock); + s->iommus.le_next = NULL; s->iommus.le_prev = NULL; QLIST_INIT(&s->spaces); @@ -1836,6 +2024,7 @@ static void riscv_iommu_unrealize(DeviceState *dev) RISCVIOMMUState *s = RISCV_IOMMU(dev); qemu_mutex_destroy(&s->core_lock); + g_hash_table_unref(s->iot_cache); g_hash_table_unref(s->ctx_cache); } @@ -1843,6 +2032,8 @@ 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_UINT32("ioatc-limit", RISCVIOMMUState, iot_limit, + LIMIT_CACHE_IOT), 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), @@ -1897,7 +2088,7 @@ static IOMMUTLBEntry riscv_iommu_memory_region_translate( /* Translation disabled or invalid. */ iotlb.addr_mask = 0; iotlb.perm = IOMMU_NONE; - } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb)) { + } else if (riscv_iommu_translate(as->iommu, ctx, &iotlb, true)) { /* Translation disabled or fault reported. */ iotlb.addr_mask = 0; iotlb.perm = IOMMU_NONE; diff --git a/hw/riscv/riscv-iommu.h b/hw/riscv/riscv-iommu.h index 6d76cb9b1a..c917b6219a 100644 --- a/hw/riscv/riscv-iommu.h +++ b/hw/riscv/riscv-iommu.h @@ -75,6 +75,9 @@ struct RISCVIOMMUState { GHashTable *ctx_cache; /* Device translation Context Cache */ QemuMutex ctx_lock; /* Device translation Cache update lock */ + GHashTable *iot_cache; /* IO Translated Address Cache */ + QemuMutex iot_lock; /* IO TLB Cache update lock */ + unsigned iot_limit; /* IO Translation Cache size limit */ /* MMIO Hardware Interface */ MemoryRegion regs_mr;