diff options
Diffstat (limited to 'hw/cxl/cxl-component-utils.c')
| -rw-r--r-- | hw/cxl/cxl-component-utils.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/hw/cxl/cxl-component-utils.c b/hw/cxl/cxl-component-utils.c new file mode 100644 index 0000000000..9457a1b029 --- /dev/null +++ b/hw/cxl/cxl-component-utils.c @@ -0,0 +1,313 @@ +/* + * 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; +} |