/* * CXL Utility library for components * * Copyright(C) 2020 Intel Corporation. * * This work is licensed under the terms of the GNU GPL, version 2. See the * COPYING file in the top-level directory. */ #include "qemu/osdep.h" #include "qemu/log.h" #include "hw/pci/pci.h" #include "hw/cxl/cxl.h" static uint64_t cxl_cache_mem_read_reg(void *opaque, hwaddr offset, unsigned size) { CXLComponentState *cxl_cstate = opaque; ComponentRegisters *cregs = &cxl_cstate->crb; if (size == 8) { qemu_log_mask(LOG_UNIMP, "CXL 8 byte cache mem registers not implemented\n"); return 0; } if (cregs->special_ops && cregs->special_ops->read) { return cregs->special_ops->read(cxl_cstate, offset, size); } else { return cregs->cache_mem_registers[offset / sizeof(*cregs->cache_mem_registers)]; } } static void cxl_cache_mem_write_reg(void *opaque, hwaddr offset, uint64_t value, unsigned size) { CXLComponentState *cxl_cstate = opaque; ComponentRegisters *cregs = &cxl_cstate->crb; uint32_t mask; if (size == 8) { qemu_log_mask(LOG_UNIMP, "CXL 8 byte cache mem registers not implemented\n"); return; } mask = cregs->cache_mem_regs_write_mask[offset / sizeof(*cregs->cache_mem_regs_write_mask)]; value &= mask; /* RO bits should remain constant. Done by reading existing value */ value |= ~mask & cregs->cache_mem_registers[offset / sizeof(*cregs->cache_mem_registers)]; if (cregs->special_ops && cregs->special_ops->write) { cregs->special_ops->write(cxl_cstate, offset, value, size); } else { cregs->cache_mem_registers[offset / sizeof(*cregs->cache_mem_registers)] = value; } } /* * 8.2.3 * The access restrictions specified in Section 8.2.2 also apply to CXL 2.0 * Component Registers. * * 8.2.2 * • A 32 bit register shall be accessed as a 4 Bytes quantity. Partial * reads are not permitted. * • A 64 bit register shall be accessed as a 8 Bytes quantity. Partial * reads are not permitted. * * As of the spec defined today, only 4 byte registers exist. */ static const MemoryRegionOps cache_mem_ops = { .read = cxl_cache_mem_read_reg, .write = cxl_cache_mem_write_reg, .endianness = DEVICE_LITTLE_ENDIAN, .valid = { .min_access_size = 4, .max_access_size = 8, .unaligned = false, }, .impl = { .min_access_size = 4, .max_access_size = 8, }, }; void cxl_component_register_block_init(Object *obj, CXLComponentState *cxl_cstate, const char *type) { ComponentRegisters *cregs = &cxl_cstate->crb; memory_region_init(&cregs->component_registers, obj, type, CXL2_COMPONENT_BLOCK_SIZE); /* io registers controls link which we don't care about in QEMU */ memory_region_init_io(&cregs->io, obj, NULL, cregs, ".io", CXL2_COMPONENT_IO_REGION_SIZE); memory_region_init_io(&cregs->cache_mem, obj, &cache_mem_ops, cregs, ".cache_mem", CXL2_COMPONENT_CM_REGION_SIZE); memory_region_add_subregion(&cregs->component_registers, 0, &cregs->io); memory_region_add_subregion(&cregs->component_registers, CXL2_COMPONENT_IO_REGION_SIZE, &cregs->cache_mem); } static void ras_init_common(uint32_t *reg_state, uint32_t *write_msk) { /* * Error status is RW1C but given bits are not yet set, it can * be handled as RO. */ reg_state[R_CXL_RAS_UNC_ERR_STATUS] = 0; /* Bits 12-13 and 17-31 reserved in CXL 2.0 */ reg_state[R_CXL_RAS_UNC_ERR_MASK] = 0x1cfff; write_msk[R_CXL_RAS_UNC_ERR_MASK] = 0x1cfff; reg_state[R_CXL_RAS_UNC_ERR_SEVERITY] = 0x1cfff; write_msk[R_CXL_RAS_UNC_ERR_SEVERITY] = 0x1cfff; reg_state[R_CXL_RAS_COR_ERR_STATUS] = 0; reg_state[R_CXL_RAS_COR_ERR_MASK] = 0x7f; write_msk[R_CXL_RAS_COR_ERR_MASK] = 0x7f; /* CXL switches and devices must set */ reg_state[R_CXL_RAS_ERR_CAP_CTRL] = 0x00; } static void hdm_init_common(uint32_t *reg_state, uint32_t *write_msk) { int decoder_count = 1; int i; ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, DECODER_COUNT, cxl_decoder_count_enc(decoder_count)); ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, TARGET_COUNT, 1); ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, INTERLEAVE_256B, 1); ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, INTERLEAVE_4K, 1); ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, POISON_ON_ERR_CAP, 0); ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_GLOBAL_CONTROL, HDM_DECODER_ENABLE, 0); write_msk[R_CXL_HDM_DECODER_GLOBAL_CONTROL] = 0x3; for (i = 0; i < decoder_count; i++) { write_msk[R_CXL_HDM_DECODER0_BASE_LO + i * 0x20] = 0xf0000000; write_msk[R_CXL_HDM_DECODER0_BASE_HI + i * 0x20] = 0xffffffff; write_msk[R_CXL_HDM_DECODER0_SIZE_LO + i * 0x20] = 0xf0000000; write_msk[R_CXL_HDM_DECODER0_SIZE_HI + i * 0x20] = 0xffffffff; write_msk[R_CXL_HDM_DECODER0_CTRL + i * 0x20] = 0x13ff; } } void cxl_component_register_init_common(uint32_t *reg_state, uint32_t *write_msk, enum reg_type type) { int caps = 0; /* * In CXL 2.0 the capabilities required for each CXL component are such that, * with the ordering chosen here, a single number can be used to define * which capabilities should be provided. */ switch (type) { case CXL2_DOWNSTREAM_PORT: case CXL2_DEVICE: /* RAS, Link */ caps = 2; break; case CXL2_UPSTREAM_PORT: case CXL2_TYPE3_DEVICE: case CXL2_LOGICAL_DEVICE: /* + HDM */ caps = 3; break; case CXL2_ROOT_PORT: /* + Extended Security, + Snoop */ caps = 5; break; default: abort(); } memset(reg_state, 0, CXL2_COMPONENT_CM_REGION_SIZE); /* CXL Capability Header Register */ ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, ID, 1); ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, VERSION, 1); ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, CACHE_MEM_VERSION, 1); ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, ARRAY_SIZE, caps); #define init_cap_reg(reg, id, version) \ QEMU_BUILD_BUG_ON(CXL_##reg##_REGISTERS_OFFSET == 0); \ do { \ int which = R_CXL_##reg##_CAPABILITY_HEADER; \ reg_state[which] = FIELD_DP32(reg_state[which], \ CXL_##reg##_CAPABILITY_HEADER, ID, id); \ reg_state[which] = \ FIELD_DP32(reg_state[which], CXL_##reg##_CAPABILITY_HEADER, \ VERSION, version); \ reg_state[which] = \ FIELD_DP32(reg_state[which], CXL_##reg##_CAPABILITY_HEADER, PTR, \ CXL_##reg##_REGISTERS_OFFSET); \ } while (0) init_cap_reg(RAS, 2, 2); ras_init_common(reg_state, write_msk); init_cap_reg(LINK, 4, 2); if (caps < 3) { return; } init_cap_reg(HDM, 5, 1); hdm_init_common(reg_state, write_msk); if (caps < 5) { return; } init_cap_reg(EXTSEC, 6, 1); init_cap_reg(SNOOP, 8, 1); #undef init_cap_reg } /* * Helper to creates a DVSEC header for a CXL entity. The caller is responsible * for tracking the valid offset. * * This function will build the DVSEC header on behalf of the caller and then * copy in the remaining data for the vendor specific bits. * It will also set up appropriate write masks. */ void cxl_component_create_dvsec(CXLComponentState *cxl, enum reg_type cxl_dev_type, uint16_t length, uint16_t type, uint8_t rev, uint8_t *body) { PCIDevice *pdev = cxl->pdev; uint16_t offset = cxl->dvsec_offset; uint8_t *wmask = pdev->wmask; assert(offset >= PCI_CFG_SPACE_SIZE && ((offset + length) < PCI_CFG_SPACE_EXP_SIZE)); assert((length & 0xf000) == 0); assert((rev & ~0xf) == 0); /* Create the DVSEC in the MCFG space */ pcie_add_capability(pdev, PCI_EXT_CAP_ID_DVSEC, 1, offset, length); pci_set_long(pdev->config + offset + PCIE_DVSEC_HEADER1_OFFSET, (length << 20) | (rev << 16) | CXL_VENDOR_ID); pci_set_word(pdev->config + offset + PCIE_DVSEC_ID_OFFSET, type); memcpy(pdev->config + offset + sizeof(DVSECHeader), body + sizeof(DVSECHeader), length - sizeof(DVSECHeader)); /* Configure write masks */ switch (type) { case PCIE_CXL_DEVICE_DVSEC: break; case NON_CXL_FUNCTION_MAP_DVSEC: break; /* Not yet implemented */ case EXTENSIONS_PORT_DVSEC: wmask[offset + offsetof(CXLDVSECPortExtensions, control)] = 0x0F; wmask[offset + offsetof(CXLDVSECPortExtensions, control) + 1] = 0x40; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_bus_base)] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_bus_limit)] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_base)] = 0xF0; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_base) + 1] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_limit)] = 0xF0; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_limit) + 1] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base)] = 0xF0; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base) + 1] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit)] = 0xF0; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit) + 1] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high)] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high) + 1] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high) + 2] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high) + 3] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high)] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high) + 1] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high) + 2] = 0xFF; wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high) + 3] = 0xFF; break; case GPF_PORT_DVSEC: wmask[offset + offsetof(CXLDVSECPortGPF, phase1_ctrl)] = 0x0F; wmask[offset + offsetof(CXLDVSECPortGPF, phase1_ctrl) + 1] = 0x0F; wmask[offset + offsetof(CXLDVSECPortGPF, phase2_ctrl)] = 0x0F; wmask[offset + offsetof(CXLDVSECPortGPF, phase2_ctrl) + 1] = 0x0F; break; case GPF_DEVICE_DVSEC: wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_duration)] = 0x0F; wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_duration) + 1] = 0x0F; wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power)] = 0xFF; wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power) + 1] = 0xFF; wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power) + 2] = 0xFF; wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power) + 3] = 0xFF; break; case PCIE_FLEXBUS_PORT_DVSEC: switch (cxl_dev_type) { case CXL2_ROOT_PORT: /* No MLD */ wmask[offset + offsetof(CXLDVSECPortFlexBus, ctrl)] = 0xbd; break; case CXL2_DOWNSTREAM_PORT: wmask[offset + offsetof(CXLDVSECPortFlexBus, ctrl)] = 0xfd; break; default: /* Registers are RO for other component types */ break; } /* There are rw1cs bits in the status register but never set currently */ break; } /* Update state for future DVSEC additions */ range_init_nofail(&cxl->dvsecs[type], cxl->dvsec_offset, length); cxl->dvsec_offset += length; }