| /* |
| * SiFive PLIC (Platform Level Interrupt Controller) |
| * |
| * Copyright (c) 2017 SiFive, Inc. |
| * |
| * This provides a parameterizable interrupt controller based on SiFive's PLIC. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2 or later, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope 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 "qapi/error.h" |
| #include "qemu/log.h" |
| #include "qemu/module.h" |
| #include "qemu/error-report.h" |
| #include "hw/sysbus.h" |
| #include "hw/pci/msi.h" |
| #include "hw/boards.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/intc/sifive_plic.h" |
| #include "target/riscv/cpu.h" |
| #include "sysemu/sysemu.h" |
| |
| #define RISCV_DEBUG_PLIC 0 |
| |
| static PLICMode char_to_mode(char c) |
| { |
| switch (c) { |
| case 'U': return PLICMode_U; |
| case 'S': return PLICMode_S; |
| case 'H': return PLICMode_H; |
| case 'M': return PLICMode_M; |
| default: |
| error_report("plic: invalid mode '%c'", c); |
| exit(1); |
| } |
| } |
| |
| static char mode_to_char(PLICMode m) |
| { |
| switch (m) { |
| case PLICMode_U: return 'U'; |
| case PLICMode_S: return 'S'; |
| case PLICMode_H: return 'H'; |
| case PLICMode_M: return 'M'; |
| default: return '?'; |
| } |
| } |
| |
| static void sifive_plic_print_state(SiFivePLICState *plic) |
| { |
| int i; |
| int addrid; |
| |
| /* pending */ |
| qemu_log("pending : "); |
| for (i = plic->bitfield_words - 1; i >= 0; i--) { |
| qemu_log("%08x", plic->pending[i]); |
| } |
| qemu_log("\n"); |
| |
| /* pending */ |
| qemu_log("claimed : "); |
| for (i = plic->bitfield_words - 1; i >= 0; i--) { |
| qemu_log("%08x", plic->claimed[i]); |
| } |
| qemu_log("\n"); |
| |
| for (addrid = 0; addrid < plic->num_addrs; addrid++) { |
| qemu_log("hart%d-%c enable: ", |
| plic->addr_config[addrid].hartid, |
| mode_to_char(plic->addr_config[addrid].mode)); |
| for (i = plic->bitfield_words - 1; i >= 0; i--) { |
| qemu_log("%08x", plic->enable[addrid * plic->bitfield_words + i]); |
| } |
| qemu_log("\n"); |
| } |
| } |
| |
| static uint32_t atomic_set_masked(uint32_t *a, uint32_t mask, uint32_t value) |
| { |
| uint32_t old, new, cmp = qatomic_read(a); |
| |
| do { |
| old = cmp; |
| new = (old & ~mask) | (value & mask); |
| cmp = qatomic_cmpxchg(a, old, new); |
| } while (old != cmp); |
| |
| return old; |
| } |
| |
| static void sifive_plic_set_pending(SiFivePLICState *plic, int irq, bool level) |
| { |
| atomic_set_masked(&plic->pending[irq >> 5], 1 << (irq & 31), -!!level); |
| } |
| |
| static void sifive_plic_set_claimed(SiFivePLICState *plic, int irq, bool level) |
| { |
| atomic_set_masked(&plic->claimed[irq >> 5], 1 << (irq & 31), -!!level); |
| } |
| |
| static int sifive_plic_irqs_pending(SiFivePLICState *plic, uint32_t addrid) |
| { |
| int i, j; |
| for (i = 0; i < plic->bitfield_words; i++) { |
| uint32_t pending_enabled_not_claimed = |
| (plic->pending[i] & ~plic->claimed[i]) & |
| plic->enable[addrid * plic->bitfield_words + i]; |
| if (!pending_enabled_not_claimed) { |
| continue; |
| } |
| for (j = 0; j < 32; j++) { |
| int irq = (i << 5) + j; |
| uint32_t prio = plic->source_priority[irq]; |
| int enabled = pending_enabled_not_claimed & (1 << j); |
| if (enabled && prio > plic->target_priority[addrid]) { |
| return 1; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static void sifive_plic_update(SiFivePLICState *plic) |
| { |
| int addrid; |
| |
| /* raise irq on harts where this irq is enabled */ |
| for (addrid = 0; addrid < plic->num_addrs; addrid++) { |
| uint32_t hartid = plic->addr_config[addrid].hartid; |
| PLICMode mode = plic->addr_config[addrid].mode; |
| CPUState *cpu = qemu_get_cpu(hartid); |
| CPURISCVState *env = cpu ? cpu->env_ptr : NULL; |
| if (!env) { |
| continue; |
| } |
| int level = sifive_plic_irqs_pending(plic, addrid); |
| switch (mode) { |
| case PLICMode_M: |
| riscv_cpu_update_mip(RISCV_CPU(cpu), MIP_MEIP, BOOL_TO_MASK(level)); |
| break; |
| case PLICMode_S: |
| riscv_cpu_update_mip(RISCV_CPU(cpu), MIP_SEIP, BOOL_TO_MASK(level)); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| if (RISCV_DEBUG_PLIC) { |
| sifive_plic_print_state(plic); |
| } |
| } |
| |
| static uint32_t sifive_plic_claim(SiFivePLICState *plic, uint32_t addrid) |
| { |
| int i, j; |
| uint32_t max_irq = 0; |
| uint32_t max_prio = plic->target_priority[addrid]; |
| |
| for (i = 0; i < plic->bitfield_words; i++) { |
| uint32_t pending_enabled_not_claimed = |
| (plic->pending[i] & ~plic->claimed[i]) & |
| plic->enable[addrid * plic->bitfield_words + i]; |
| if (!pending_enabled_not_claimed) { |
| continue; |
| } |
| for (j = 0; j < 32; j++) { |
| int irq = (i << 5) + j; |
| uint32_t prio = plic->source_priority[irq]; |
| int enabled = pending_enabled_not_claimed & (1 << j); |
| if (enabled && prio > max_prio) { |
| max_irq = irq; |
| max_prio = prio; |
| } |
| } |
| } |
| |
| if (max_irq) { |
| sifive_plic_set_pending(plic, max_irq, false); |
| sifive_plic_set_claimed(plic, max_irq, true); |
| } |
| return max_irq; |
| } |
| |
| static uint64_t sifive_plic_read(void *opaque, hwaddr addr, unsigned size) |
| { |
| SiFivePLICState *plic = opaque; |
| |
| /* writes must be 4 byte words */ |
| if ((addr & 0x3) != 0) { |
| goto err; |
| } |
| |
| if (addr >= plic->priority_base && /* 4 bytes per source */ |
| addr < plic->priority_base + (plic->num_sources << 2)) |
| { |
| uint32_t irq = ((addr - plic->priority_base) >> 2) + 1; |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: read priority: irq=%d priority=%d\n", |
| irq, plic->source_priority[irq]); |
| } |
| return plic->source_priority[irq]; |
| } else if (addr >= plic->pending_base && /* 1 bit per source */ |
| addr < plic->pending_base + (plic->num_sources >> 3)) |
| { |
| uint32_t word = (addr - plic->pending_base) >> 2; |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: read pending: word=%d value=%d\n", |
| word, plic->pending[word]); |
| } |
| return plic->pending[word]; |
| } else if (addr >= plic->enable_base && /* 1 bit per source */ |
| addr < plic->enable_base + plic->num_addrs * plic->enable_stride) |
| { |
| uint32_t addrid = (addr - plic->enable_base) / plic->enable_stride; |
| uint32_t wordid = (addr & (plic->enable_stride - 1)) >> 2; |
| if (wordid < plic->bitfield_words) { |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: read enable: hart%d-%c word=%d value=%x\n", |
| plic->addr_config[addrid].hartid, |
| mode_to_char(plic->addr_config[addrid].mode), wordid, |
| plic->enable[addrid * plic->bitfield_words + wordid]); |
| } |
| return plic->enable[addrid * plic->bitfield_words + wordid]; |
| } |
| } else if (addr >= plic->context_base && /* 1 bit per source */ |
| addr < plic->context_base + plic->num_addrs * plic->context_stride) |
| { |
| uint32_t addrid = (addr - plic->context_base) / plic->context_stride; |
| uint32_t contextid = (addr & (plic->context_stride - 1)); |
| if (contextid == 0) { |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: read priority: hart%d-%c priority=%x\n", |
| plic->addr_config[addrid].hartid, |
| mode_to_char(plic->addr_config[addrid].mode), |
| plic->target_priority[addrid]); |
| } |
| return plic->target_priority[addrid]; |
| } else if (contextid == 4) { |
| uint32_t value = sifive_plic_claim(plic, addrid); |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: read claim: hart%d-%c irq=%x\n", |
| plic->addr_config[addrid].hartid, |
| mode_to_char(plic->addr_config[addrid].mode), |
| value); |
| } |
| sifive_plic_update(plic); |
| return value; |
| } |
| } |
| |
| err: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: Invalid register read 0x%" HWADDR_PRIx "\n", |
| __func__, addr); |
| return 0; |
| } |
| |
| static void sifive_plic_write(void *opaque, hwaddr addr, uint64_t value, |
| unsigned size) |
| { |
| SiFivePLICState *plic = opaque; |
| |
| /* writes must be 4 byte words */ |
| if ((addr & 0x3) != 0) { |
| goto err; |
| } |
| |
| if (addr >= plic->priority_base && /* 4 bytes per source */ |
| addr < plic->priority_base + (plic->num_sources << 2)) |
| { |
| uint32_t irq = ((addr - plic->priority_base) >> 2) + 1; |
| plic->source_priority[irq] = value & 7; |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: write priority: irq=%d priority=%d\n", |
| irq, plic->source_priority[irq]); |
| } |
| sifive_plic_update(plic); |
| return; |
| } else if (addr >= plic->pending_base && /* 1 bit per source */ |
| addr < plic->pending_base + (plic->num_sources >> 3)) |
| { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: invalid pending write: 0x%" HWADDR_PRIx "", |
| __func__, addr); |
| return; |
| } else if (addr >= plic->enable_base && /* 1 bit per source */ |
| addr < plic->enable_base + plic->num_addrs * plic->enable_stride) |
| { |
| uint32_t addrid = (addr - plic->enable_base) / plic->enable_stride; |
| uint32_t wordid = (addr & (plic->enable_stride - 1)) >> 2; |
| if (wordid < plic->bitfield_words) { |
| plic->enable[addrid * plic->bitfield_words + wordid] = value; |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: write enable: hart%d-%c word=%d value=%x\n", |
| plic->addr_config[addrid].hartid, |
| mode_to_char(plic->addr_config[addrid].mode), wordid, |
| plic->enable[addrid * plic->bitfield_words + wordid]); |
| } |
| return; |
| } |
| } else if (addr >= plic->context_base && /* 4 bytes per reg */ |
| addr < plic->context_base + plic->num_addrs * plic->context_stride) |
| { |
| uint32_t addrid = (addr - plic->context_base) / plic->context_stride; |
| uint32_t contextid = (addr & (plic->context_stride - 1)); |
| if (contextid == 0) { |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: write priority: hart%d-%c priority=%x\n", |
| plic->addr_config[addrid].hartid, |
| mode_to_char(plic->addr_config[addrid].mode), |
| plic->target_priority[addrid]); |
| } |
| if (value <= plic->num_priorities) { |
| plic->target_priority[addrid] = value; |
| sifive_plic_update(plic); |
| } |
| return; |
| } else if (contextid == 4) { |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("plic: write claim: hart%d-%c irq=%x\n", |
| plic->addr_config[addrid].hartid, |
| mode_to_char(plic->addr_config[addrid].mode), |
| (uint32_t)value); |
| } |
| if (value < plic->num_sources) { |
| sifive_plic_set_claimed(plic, value, false); |
| sifive_plic_update(plic); |
| } |
| return; |
| } |
| } |
| |
| err: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: Invalid register write 0x%" HWADDR_PRIx "\n", |
| __func__, addr); |
| } |
| |
| static const MemoryRegionOps sifive_plic_ops = { |
| .read = sifive_plic_read, |
| .write = sifive_plic_write, |
| .endianness = DEVICE_LITTLE_ENDIAN, |
| .valid = { |
| .min_access_size = 4, |
| .max_access_size = 4 |
| } |
| }; |
| |
| static Property sifive_plic_properties[] = { |
| DEFINE_PROP_STRING("hart-config", SiFivePLICState, hart_config), |
| DEFINE_PROP_UINT32("hartid-base", SiFivePLICState, hartid_base, 0), |
| DEFINE_PROP_UINT32("num-sources", SiFivePLICState, num_sources, 0), |
| DEFINE_PROP_UINT32("num-priorities", SiFivePLICState, num_priorities, 0), |
| DEFINE_PROP_UINT32("priority-base", SiFivePLICState, priority_base, 0), |
| DEFINE_PROP_UINT32("pending-base", SiFivePLICState, pending_base, 0), |
| DEFINE_PROP_UINT32("enable-base", SiFivePLICState, enable_base, 0), |
| DEFINE_PROP_UINT32("enable-stride", SiFivePLICState, enable_stride, 0), |
| DEFINE_PROP_UINT32("context-base", SiFivePLICState, context_base, 0), |
| DEFINE_PROP_UINT32("context-stride", SiFivePLICState, context_stride, 0), |
| DEFINE_PROP_UINT32("aperture-size", SiFivePLICState, aperture_size, 0), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| /* |
| * parse PLIC hart/mode address offset config |
| * |
| * "M" 1 hart with M mode |
| * "MS,MS" 2 harts, 0-1 with M and S mode |
| * "M,MS,MS,MS,MS" 5 harts, 0 with M mode, 1-5 with M and S mode |
| */ |
| static void parse_hart_config(SiFivePLICState *plic) |
| { |
| int addrid, hartid, modes; |
| const char *p; |
| char c; |
| |
| /* count and validate hart/mode combinations */ |
| addrid = 0, hartid = 0, modes = 0; |
| p = plic->hart_config; |
| while ((c = *p++)) { |
| if (c == ',') { |
| addrid += ctpop8(modes); |
| modes = 0; |
| hartid++; |
| } else { |
| int m = 1 << char_to_mode(c); |
| if (modes == (modes | m)) { |
| error_report("plic: duplicate mode '%c' in config: %s", |
| c, plic->hart_config); |
| exit(1); |
| } |
| modes |= m; |
| } |
| } |
| if (modes) { |
| addrid += ctpop8(modes); |
| } |
| hartid++; |
| |
| plic->num_addrs = addrid; |
| plic->num_harts = hartid; |
| |
| /* store hart/mode combinations */ |
| plic->addr_config = g_new(PLICAddr, plic->num_addrs); |
| addrid = 0, hartid = plic->hartid_base; |
| p = plic->hart_config; |
| while ((c = *p++)) { |
| if (c == ',') { |
| hartid++; |
| } else { |
| plic->addr_config[addrid].addrid = addrid; |
| plic->addr_config[addrid].hartid = hartid; |
| plic->addr_config[addrid].mode = char_to_mode(c); |
| addrid++; |
| } |
| } |
| } |
| |
| static void sifive_plic_irq_request(void *opaque, int irq, int level) |
| { |
| SiFivePLICState *plic = opaque; |
| if (RISCV_DEBUG_PLIC) { |
| qemu_log("sifive_plic_irq_request: irq=%d level=%d\n", irq, level); |
| } |
| sifive_plic_set_pending(plic, irq, level > 0); |
| sifive_plic_update(plic); |
| } |
| |
| static void sifive_plic_realize(DeviceState *dev, Error **errp) |
| { |
| SiFivePLICState *plic = SIFIVE_PLIC(dev); |
| int i; |
| |
| memory_region_init_io(&plic->mmio, OBJECT(dev), &sifive_plic_ops, plic, |
| TYPE_SIFIVE_PLIC, plic->aperture_size); |
| parse_hart_config(plic); |
| plic->bitfield_words = (plic->num_sources + 31) >> 5; |
| plic->source_priority = g_new0(uint32_t, plic->num_sources); |
| plic->target_priority = g_new(uint32_t, plic->num_addrs); |
| plic->pending = g_new0(uint32_t, plic->bitfield_words); |
| plic->claimed = g_new0(uint32_t, plic->bitfield_words); |
| plic->enable = g_new0(uint32_t, plic->bitfield_words * plic->num_addrs); |
| sysbus_init_mmio(SYS_BUS_DEVICE(dev), &plic->mmio); |
| qdev_init_gpio_in(dev, sifive_plic_irq_request, plic->num_sources); |
| |
| /* We can't allow the supervisor to control SEIP as this would allow the |
| * supervisor to clear a pending external interrupt which will result in |
| * lost a interrupt in the case a PLIC is attached. The SEIP bit must be |
| * hardware controlled when a PLIC is attached. |
| */ |
| for (i = 0; i < plic->num_harts; i++) { |
| RISCVCPU *cpu = RISCV_CPU(qemu_get_cpu(plic->hartid_base + i)); |
| if (riscv_cpu_claim_interrupts(cpu, MIP_SEIP) < 0) { |
| error_report("SEIP already claimed"); |
| exit(1); |
| } |
| } |
| |
| msi_nonbroken = true; |
| } |
| |
| static void sifive_plic_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| device_class_set_props(dc, sifive_plic_properties); |
| dc->realize = sifive_plic_realize; |
| } |
| |
| static const TypeInfo sifive_plic_info = { |
| .name = TYPE_SIFIVE_PLIC, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(SiFivePLICState), |
| .class_init = sifive_plic_class_init, |
| }; |
| |
| static void sifive_plic_register_types(void) |
| { |
| type_register_static(&sifive_plic_info); |
| } |
| |
| type_init(sifive_plic_register_types) |
| |
| /* |
| * Create PLIC device. |
| */ |
| DeviceState *sifive_plic_create(hwaddr addr, char *hart_config, |
| uint32_t hartid_base, uint32_t num_sources, |
| uint32_t num_priorities, uint32_t priority_base, |
| uint32_t pending_base, uint32_t enable_base, |
| uint32_t enable_stride, uint32_t context_base, |
| uint32_t context_stride, uint32_t aperture_size) |
| { |
| DeviceState *dev = qdev_new(TYPE_SIFIVE_PLIC); |
| assert(enable_stride == (enable_stride & -enable_stride)); |
| assert(context_stride == (context_stride & -context_stride)); |
| qdev_prop_set_string(dev, "hart-config", hart_config); |
| qdev_prop_set_uint32(dev, "hartid-base", hartid_base); |
| qdev_prop_set_uint32(dev, "num-sources", num_sources); |
| qdev_prop_set_uint32(dev, "num-priorities", num_priorities); |
| qdev_prop_set_uint32(dev, "priority-base", priority_base); |
| qdev_prop_set_uint32(dev, "pending-base", pending_base); |
| qdev_prop_set_uint32(dev, "enable-base", enable_base); |
| qdev_prop_set_uint32(dev, "enable-stride", enable_stride); |
| qdev_prop_set_uint32(dev, "context-base", context_base); |
| qdev_prop_set_uint32(dev, "context-stride", context_stride); |
| qdev_prop_set_uint32(dev, "aperture-size", aperture_size); |
| sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); |
| sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, addr); |
| return dev; |
| } |
