/* * NVDIMM ACPI Implementation * * Copyright(C) 2015 Intel Corporation. * * Author: * Xiao Guangrong * * NFIT is defined in ACPI 6.0: 5.2.25 NVDIMM Firmware Interface Table (NFIT) * and the DSM specification can be found at: * http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf * * Currently, it only supports PMEM Virtualization. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see */ #include "qemu/osdep.h" #include "hw/acpi/acpi.h" #include "hw/acpi/aml-build.h" #include "hw/acpi/bios-linker-loader.h" #include "hw/nvram/fw_cfg.h" #include "hw/mem/nvdimm.h" static int nvdimm_plugged_device_list(Object *obj, void *opaque) { GSList **list = opaque; if (object_dynamic_cast(obj, TYPE_NVDIMM)) { DeviceState *dev = DEVICE(obj); if (dev->realized) { /* only realized NVDIMMs matter */ *list = g_slist_append(*list, DEVICE(obj)); } } object_child_foreach(obj, nvdimm_plugged_device_list, opaque); return 0; } /* * inquire plugged NVDIMM devices and link them into the list which is * returned to the caller. * * Note: it is the caller's responsibility to free the list to avoid * memory leak. */ static GSList *nvdimm_get_plugged_device_list(void) { GSList *list = NULL; object_child_foreach(qdev_get_machine(), nvdimm_plugged_device_list, &list); return list; } #define NVDIMM_UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ { (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \ (b) & 0xff, ((b) >> 8) & 0xff, (c) & 0xff, ((c) >> 8) & 0xff, \ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } /* * define Byte Addressable Persistent Memory (PM) Region according to * ACPI 6.0: 5.2.25.1 System Physical Address Range Structure. */ static const uint8_t nvdimm_nfit_spa_uuid[] = NVDIMM_UUID_LE(0x66f0d379, 0xb4f3, 0x4074, 0xac, 0x43, 0x0d, 0x33, 0x18, 0xb7, 0x8c, 0xdb); /* * NVDIMM Firmware Interface Table * @signature: "NFIT" * * It provides information that allows OSPM to enumerate NVDIMM present in * the platform and associate system physical address ranges created by the * NVDIMMs. * * It is defined in ACPI 6.0: 5.2.25 NVDIMM Firmware Interface Table (NFIT) */ struct NvdimmNfitHeader { ACPI_TABLE_HEADER_DEF uint32_t reserved; } QEMU_PACKED; typedef struct NvdimmNfitHeader NvdimmNfitHeader; /* * define NFIT structures according to ACPI 6.0: 5.2.25 NVDIMM Firmware * Interface Table (NFIT). */ /* * System Physical Address Range Structure * * It describes the system physical address ranges occupied by NVDIMMs and * the types of the regions. */ struct NvdimmNfitSpa { uint16_t type; uint16_t length; uint16_t spa_index; uint16_t flags; uint32_t reserved; uint32_t proximity_domain; uint8_t type_guid[16]; uint64_t spa_base; uint64_t spa_length; uint64_t mem_attr; } QEMU_PACKED; typedef struct NvdimmNfitSpa NvdimmNfitSpa; /* * Memory Device to System Physical Address Range Mapping Structure * * It enables identifying each NVDIMM region and the corresponding SPA * describing the memory interleave */ struct NvdimmNfitMemDev { uint16_t type; uint16_t length; uint32_t nfit_handle; uint16_t phys_id; uint16_t region_id; uint16_t spa_index; uint16_t dcr_index; uint64_t region_len; uint64_t region_offset; uint64_t region_dpa; uint16_t interleave_index; uint16_t interleave_ways; uint16_t flags; uint16_t reserved; } QEMU_PACKED; typedef struct NvdimmNfitMemDev NvdimmNfitMemDev; /* * NVDIMM Control Region Structure * * It describes the NVDIMM and if applicable, Block Control Window. */ struct NvdimmNfitControlRegion { uint16_t type; uint16_t length; uint16_t dcr_index; uint16_t vendor_id; uint16_t device_id; uint16_t revision_id; uint16_t sub_vendor_id; uint16_t sub_device_id; uint16_t sub_revision_id; uint8_t reserved[6]; uint32_t serial_number; uint16_t fic; uint16_t num_bcw; uint64_t bcw_size; uint64_t cmd_offset; uint64_t cmd_size; uint64_t status_offset; uint64_t status_size; uint16_t flags; uint8_t reserved2[6]; } QEMU_PACKED; typedef struct NvdimmNfitControlRegion NvdimmNfitControlRegion; /* * Module serial number is a unique number for each device. We use the * slot id of NVDIMM device to generate this number so that each device * associates with a different number. * * 0x123456 is a magic number we arbitrarily chose. */ static uint32_t nvdimm_slot_to_sn(int slot) { return 0x123456 + slot; } /* * handle is used to uniquely associate nfit_memdev structure with NVDIMM * ACPI device - nfit_memdev.nfit_handle matches with the value returned * by ACPI device _ADR method. * * We generate the handle with the slot id of NVDIMM device and reserve * 0 for NVDIMM root device. */ static uint32_t nvdimm_slot_to_handle(int slot) { return slot + 1; } /* * index uniquely identifies the structure, 0 is reserved which indicates * that the structure is not valid or the associated structure is not * present. * * Each NVDIMM device needs two indexes, one for nfit_spa and another for * nfit_dc which are generated by the slot id of NVDIMM device. */ static uint16_t nvdimm_slot_to_spa_index(int slot) { return (slot + 1) << 1; } /* See the comments of nvdimm_slot_to_spa_index(). */ static uint32_t nvdimm_slot_to_dcr_index(int slot) { return nvdimm_slot_to_spa_index(slot) + 1; } static NVDIMMDevice *nvdimm_get_device_by_handle(uint32_t handle) { NVDIMMDevice *nvdimm = NULL; GSList *list, *device_list = nvdimm_get_plugged_device_list(); for (list = device_list; list; list = list->next) { NVDIMMDevice *nvd = list->data; int slot = object_property_get_int(OBJECT(nvd), PC_DIMM_SLOT_PROP, NULL); if (nvdimm_slot_to_handle(slot) == handle) { nvdimm = nvd; break; } } g_slist_free(device_list); return nvdimm; } /* ACPI 6.0: 5.2.25.1 System Physical Address Range Structure */ static void nvdimm_build_structure_spa(GArray *structures, DeviceState *dev) { NvdimmNfitSpa *nfit_spa; uint64_t addr = object_property_get_int(OBJECT(dev), PC_DIMM_ADDR_PROP, NULL); uint64_t size = object_property_get_int(OBJECT(dev), PC_DIMM_SIZE_PROP, NULL); uint32_t node = object_property_get_int(OBJECT(dev), PC_DIMM_NODE_PROP, NULL); int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, NULL); nfit_spa = acpi_data_push(structures, sizeof(*nfit_spa)); nfit_spa->type = cpu_to_le16(0 /* System Physical Address Range Structure */); nfit_spa->length = cpu_to_le16(sizeof(*nfit_spa)); nfit_spa->spa_index = cpu_to_le16(nvdimm_slot_to_spa_index(slot)); /* * Control region is strict as all the device info, such as SN, index, * is associated with slot id. */ nfit_spa->flags = cpu_to_le16(1 /* Control region is strictly for management during hot add/online operation */ | 2 /* Data in Proximity Domain field is valid*/); /* NUMA node. */ nfit_spa->proximity_domain = cpu_to_le32(node); /* the region reported as PMEM. */ memcpy(nfit_spa->type_guid, nvdimm_nfit_spa_uuid, sizeof(nvdimm_nfit_spa_uuid)); nfit_spa->spa_base = cpu_to_le64(addr); nfit_spa->spa_length = cpu_to_le64(size); /* It is the PMEM and can be cached as writeback. */ nfit_spa->mem_attr = cpu_to_le64(0x8ULL /* EFI_MEMORY_WB */ | 0x8000ULL /* EFI_MEMORY_NV */); } /* * ACPI 6.0: 5.2.25.2 Memory Device to System Physical Address Range Mapping * Structure */ static void nvdimm_build_structure_memdev(GArray *structures, DeviceState *dev) { NvdimmNfitMemDev *nfit_memdev; uint64_t size = object_property_get_int(OBJECT(dev), PC_DIMM_SIZE_PROP, NULL); int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, NULL); uint32_t handle = nvdimm_slot_to_handle(slot); nfit_memdev = acpi_data_push(structures, sizeof(*nfit_memdev)); nfit_memdev->type = cpu_to_le16(1 /* Memory Device to System Address Range Map Structure*/); nfit_memdev->length = cpu_to_le16(sizeof(*nfit_memdev)); nfit_memdev->nfit_handle = cpu_to_le32(handle); /* * associate memory device with System Physical Address Range * Structure. */ nfit_memdev->spa_index = cpu_to_le16(nvdimm_slot_to_spa_index(slot)); /* associate memory device with Control Region Structure. */ nfit_memdev->dcr_index = cpu_to_le16(nvdimm_slot_to_dcr_index(slot)); /* The memory region on the device. */ nfit_memdev->region_len = cpu_to_le64(size); /* The device address starts from 0. */ nfit_memdev->region_dpa = cpu_to_le64(0); /* Only one interleave for PMEM. */ nfit_memdev->interleave_ways = cpu_to_le16(1); } /* * ACPI 6.0: 5.2.25.5 NVDIMM Control Region Structure. */ static void nvdimm_build_structure_dcr(GArray *structures, DeviceState *dev) { NvdimmNfitControlRegion *nfit_dcr; int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, NULL); uint32_t sn = nvdimm_slot_to_sn(slot); nfit_dcr = acpi_data_push(structures, sizeof(*nfit_dcr)); nfit_dcr->type = cpu_to_le16(4 /* NVDIMM Control Region Structure */); nfit_dcr->length = cpu_to_le16(sizeof(*nfit_dcr)); nfit_dcr->dcr_index = cpu_to_le16(nvdimm_slot_to_dcr_index(slot)); /* vendor: Intel. */ nfit_dcr->vendor_id = cpu_to_le16(0x8086); nfit_dcr->device_id = cpu_to_le16(1); /* The _DSM method is following Intel's DSM specification. */ nfit_dcr->revision_id = cpu_to_le16(1 /* Current Revision supported in ACPI 6.0 is 1. */); nfit_dcr->serial_number = cpu_to_le32(sn); nfit_dcr->fic = cpu_to_le16(0x201 /* Format Interface Code. See Chapter 2: NVDIMM Device Specific Method (DSM) in DSM Spec Rev1.*/); } static GArray *nvdimm_build_device_structure(GSList *device_list) { GArray *structures = g_array_new(false, true /* clear */, 1); for (; device_list; device_list = device_list->next) { DeviceState *dev = device_list->data; /* build System Physical Address Range Structure. */ nvdimm_build_structure_spa(structures, dev); /* * build Memory Device to System Physical Address Range Mapping * Structure. */ nvdimm_build_structure_memdev(structures, dev); /* build NVDIMM Control Region Structure. */ nvdimm_build_structure_dcr(structures, dev); } return structures; } static void nvdimm_build_nfit(GSList *device_list, GArray *table_offsets, GArray *table_data, BIOSLinker *linker) { GArray *structures = nvdimm_build_device_structure(device_list); unsigned int header; acpi_add_table(table_offsets, table_data); /* NFIT header. */ header = table_data->len; acpi_data_push(table_data, sizeof(NvdimmNfitHeader)); /* NVDIMM device structures. */ g_array_append_vals(table_data, structures->data, structures->len); build_header(linker, table_data, (void *)(table_data->data + header), "NFIT", sizeof(NvdimmNfitHeader) + structures->len, 1, NULL, NULL); g_array_free(structures, true); } struct NvdimmDsmIn { uint32_t handle; uint32_t revision; uint32_t function; /* the remaining size in the page is used by arg3. */ union { uint8_t arg3[4084]; }; } QEMU_PACKED; typedef struct NvdimmDsmIn NvdimmDsmIn; QEMU_BUILD_BUG_ON(sizeof(NvdimmDsmIn) != 4096); struct NvdimmDsmOut { /* the size of buffer filled by QEMU. */ uint32_t len; uint8_t data[4092]; } QEMU_PACKED; typedef struct NvdimmDsmOut NvdimmDsmOut; QEMU_BUILD_BUG_ON(sizeof(NvdimmDsmOut) != 4096); struct NvdimmDsmFunc0Out { /* the size of buffer filled by QEMU. */ uint32_t len; uint32_t supported_func; } QEMU_PACKED; typedef struct NvdimmDsmFunc0Out NvdimmDsmFunc0Out; struct NvdimmDsmFuncNoPayloadOut { /* the size of buffer filled by QEMU. */ uint32_t len; uint32_t func_ret_status; } QEMU_PACKED; typedef struct NvdimmDsmFuncNoPayloadOut NvdimmDsmFuncNoPayloadOut; struct NvdimmFuncGetLabelSizeOut { /* the size of buffer filled by QEMU. */ uint32_t len; uint32_t func_ret_status; /* return status code. */ uint32_t label_size; /* the size of label data area. */ /* * Maximum size of the namespace label data length supported by * the platform in Get/Set Namespace Label Data functions. */ uint32_t max_xfer; } QEMU_PACKED; typedef struct NvdimmFuncGetLabelSizeOut NvdimmFuncGetLabelSizeOut; QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncGetLabelSizeOut) > 4096); struct NvdimmFuncGetLabelDataIn { uint32_t offset; /* the offset in the namespace label data area. */ uint32_t length; /* the size of data is to be read via the function. */ } QEMU_PACKED; typedef struct NvdimmFuncGetLabelDataIn NvdimmFuncGetLabelDataIn; QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncGetLabelDataIn) + offsetof(NvdimmDsmIn, arg3) > 4096); struct NvdimmFuncGetLabelDataOut { /* the size of buffer filled by QEMU. */ uint32_t len; uint32_t func_ret_status; /* return status code. */ uint8_t out_buf[0]; /* the data got via Get Namesapce Label function. */ } QEMU_PACKED; typedef struct NvdimmFuncGetLabelDataOut NvdimmFuncGetLabelDataOut; QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncGetLabelDataOut) > 4096); struct NvdimmFuncSetLabelDataIn { uint32_t offset; /* the offset in the namespace label data area. */ uint32_t length; /* the size of data is to be written via the function. */ uint8_t in_buf[0]; /* the data written to label data area. */ } QEMU_PACKED; typedef struct NvdimmFuncSetLabelDataIn NvdimmFuncSetLabelDataIn; QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncSetLabelDataIn) + offsetof(NvdimmDsmIn, arg3) > 4096); static void nvdimm_dsm_function0(uint32_t supported_func, hwaddr dsm_mem_addr) { NvdimmDsmFunc0Out func0 = { .len = cpu_to_le32(sizeof(func0)), .supported_func = cpu_to_le32(supported_func), }; cpu_physical_memory_write(dsm_mem_addr, &func0, sizeof(func0)); } static void nvdimm_dsm_no_payload(uint32_t func_ret_status, hwaddr dsm_mem_addr) { NvdimmDsmFuncNoPayloadOut out = { .len = cpu_to_le32(sizeof(out)), .func_ret_status = cpu_to_le32(func_ret_status), }; cpu_physical_memory_write(dsm_mem_addr, &out, sizeof(out)); } static void nvdimm_dsm_root(NvdimmDsmIn *in, hwaddr dsm_mem_addr) { /* * function 0 is called to inquire which functions are supported by * OSPM */ if (!in->function) { nvdimm_dsm_function0(0 /* No function supported other than function 0 */, dsm_mem_addr); return; } /* No function except function 0 is supported yet. */ nvdimm_dsm_no_payload(1 /* Not Supported */, dsm_mem_addr); } /* * the max transfer size is the max size transferred by both a * 'Get Namespace Label Data' function and a 'Set Namespace Label Data' * function. */ static uint32_t nvdimm_get_max_xfer_label_size(void) { uint32_t max_get_size, max_set_size, dsm_memory_size = 4096; /* * the max data ACPI can read one time which is transferred by * the response of 'Get Namespace Label Data' function. */ max_get_size = dsm_memory_size - sizeof(NvdimmFuncGetLabelDataOut); /* * the max data ACPI can write one time which is transferred by * 'Set Namespace Label Data' function. */ max_set_size = dsm_memory_size - offsetof(NvdimmDsmIn, arg3) - sizeof(NvdimmFuncSetLabelDataIn); return MIN(max_get_size, max_set_size); } /* * DSM Spec Rev1 4.4 Get Namespace Label Size (Function Index 4). * * It gets the size of Namespace Label data area and the max data size * that Get/Set Namespace Label Data functions can transfer. */ static void nvdimm_dsm_label_size(NVDIMMDevice *nvdimm, hwaddr dsm_mem_addr) { NvdimmFuncGetLabelSizeOut label_size_out = { .len = cpu_to_le32(sizeof(label_size_out)), }; uint32_t label_size, mxfer; label_size = nvdimm->label_size; mxfer = nvdimm_get_max_xfer_label_size(); nvdimm_debug("label_size %#x, max_xfer %#x.\n", label_size, mxfer); label_size_out.func_ret_status = cpu_to_le32(0 /* Success */); label_size_out.label_size = cpu_to_le32(label_size); label_size_out.max_xfer = cpu_to_le32(mxfer); cpu_physical_memory_write(dsm_mem_addr, &label_size_out, sizeof(label_size_out)); } static uint32_t nvdimm_rw_label_data_check(NVDIMMDevice *nvdimm, uint32_t offset, uint32_t length) { uint32_t ret = 3 /* Invalid Input Parameters */; if (offset + length < offset) { nvdimm_debug("offset %#x + length %#x is overflow.\n", offset, length); return ret; } if (nvdimm->label_size < offset + length) { nvdimm_debug("position %#x is beyond label data (len = %" PRIx64 ").\n", offset + length, nvdimm->label_size); return ret; } if (length > nvdimm_get_max_xfer_label_size()) { nvdimm_debug("length (%#x) is larger than max_xfer (%#x).\n", length, nvdimm_get_max_xfer_label_size()); return ret; } return 0 /* Success */; } /* * DSM Spec Rev1 4.5 Get Namespace Label Data (Function Index 5). */ static void nvdimm_dsm_get_label_data(NVDIMMDevice *nvdimm, NvdimmDsmIn *in, hwaddr dsm_mem_addr) { NVDIMMClass *nvc = NVDIMM_GET_CLASS(nvdimm); NvdimmFuncGetLabelDataIn *get_label_data; NvdimmFuncGetLabelDataOut *get_label_data_out; uint32_t status; int size; get_label_data = (NvdimmFuncGetLabelDataIn *)in->arg3; le32_to_cpus(&get_label_data->offset); le32_to_cpus(&get_label_data->length); nvdimm_debug("Read Label Data: offset %#x length %#x.\n", get_label_data->offset, get_label_data->length); status = nvdimm_rw_label_data_check(nvdimm, get_label_data->offset, get_label_data->length); if (status != 0 /* Success */) { nvdimm_dsm_no_payload(status, dsm_mem_addr); return; } size = sizeof(*get_label_data_out) + get_label_data->length; assert(size <= 4096); get_label_data_out = g_malloc(size); get_label_data_out->len = cpu_to_le32(size); get_label_data_out->func_ret_status = cpu_to_le32(0 /* Success */); nvc->read_label_data(nvdimm, get_label_data_out->out_buf, get_label_data->length, get_label_data->offset); cpu_physical_memory_write(dsm_mem_addr, get_label_data_out, size); g_free(get_label_data_out); } /* * DSM Spec Rev1 4.6 Set Namespace Label Data (Function Index 6). */ static void nvdimm_dsm_set_label_data(NVDIMMDevice *nvdimm, NvdimmDsmIn *in, hwaddr dsm_mem_addr) { NVDIMMClass *nvc = NVDIMM_GET_CLASS(nvdimm); NvdimmFuncSetLabelDataIn *set_label_data; uint32_t status; set_label_data = (NvdimmFuncSetLabelDataIn *)in->arg3; le32_to_cpus(&set_label_data->offset); le32_to_cpus(&set_label_data->length); nvdimm_debug("Write Label Data: offset %#x length %#x.\n", set_label_data->offset, set_label_data->length); status = nvdimm_rw_label_data_check(nvdimm, set_label_data->offset, set_label_data->length); if (status != 0 /* Success */) { nvdimm_dsm_no_payload(status, dsm_mem_addr); return; } assert(sizeof(*in) + sizeof(*set_label_data) + set_label_data->length <= 4096); nvc->write_label_data(nvdimm, set_label_data->in_buf, set_label_data->length, set_label_data->offset); nvdimm_dsm_no_payload(0 /* Success */, dsm_mem_addr); } static void nvdimm_dsm_device(NvdimmDsmIn *in, hwaddr dsm_mem_addr) { NVDIMMDevice *nvdimm = nvdimm_get_device_by_handle(in->handle); /* See the comments in nvdimm_dsm_root(). */ if (!in->function) { uint32_t supported_func = 0; if (nvdimm && nvdimm->label_size) { supported_func |= 0x1 /* Bit 0 indicates whether there is support for any functions other than function 0. */ | 1 << 4 /* Get Namespace Label Size */ | 1 << 5 /* Get Namespace Label Data */ | 1 << 6 /* Set Namespace Label Data */; } nvdimm_dsm_function0(supported_func, dsm_mem_addr); return; } if (!nvdimm) { nvdimm_dsm_no_payload(2 /* Non-Existing Memory Device */, dsm_mem_addr); return; } /* Encode DSM function according to DSM Spec Rev1. */ switch (in->function) { case 4 /* Get Namespace Label Size */: if (nvdimm->label_size) { nvdimm_dsm_label_size(nvdimm, dsm_mem_addr); return; } break; case 5 /* Get Namespace Label Data */: if (nvdimm->label_size) { nvdimm_dsm_get_label_data(nvdimm, in, dsm_mem_addr); return; } break; case 0x6 /* Set Namespace Label Data */: if (nvdimm->label_size) { nvdimm_dsm_set_label_data(nvdimm, in, dsm_mem_addr); return; } break; } nvdimm_dsm_no_payload(1 /* Not Supported */, dsm_mem_addr); } static uint64_t nvdimm_dsm_read(void *opaque, hwaddr addr, unsigned size) { nvdimm_debug("BUG: we never read _DSM IO Port.\n"); return 0; } static void nvdimm_dsm_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) { NvdimmDsmIn *in; hwaddr dsm_mem_addr = val; nvdimm_debug("dsm memory address %#" HWADDR_PRIx ".\n", dsm_mem_addr); /* * The DSM memory is mapped to guest address space so an evil guest * can change its content while we are doing DSM emulation. Avoid * this by copying DSM memory to QEMU local memory. */ in = g_new(NvdimmDsmIn, 1); cpu_physical_memory_read(dsm_mem_addr, in, sizeof(*in)); le32_to_cpus(&in->revision); le32_to_cpus(&in->function); le32_to_cpus(&in->handle); nvdimm_debug("Revision %#x Handler %#x Function %#x.\n", in->revision, in->handle, in->function); if (in->revision != 0x1 /* Currently we only support DSM Spec Rev1. */) { nvdimm_debug("Revision %#x is not supported, expect %#x.\n", in->revision, 0x1); nvdimm_dsm_no_payload(1 /* Not Supported */, dsm_mem_addr); goto exit; } /* Handle 0 is reserved for NVDIMM Root Device. */ if (!in->handle) { nvdimm_dsm_root(in, dsm_mem_addr); goto exit; } nvdimm_dsm_device(in, dsm_mem_addr); exit: g_free(in); } static const MemoryRegionOps nvdimm_dsm_ops = { .read = nvdimm_dsm_read, .write = nvdimm_dsm_write, .endianness = DEVICE_LITTLE_ENDIAN, .valid = { .min_access_size = 4, .max_access_size = 4, }, }; void nvdimm_init_acpi_state(AcpiNVDIMMState *state, MemoryRegion *io, FWCfgState *fw_cfg, Object *owner) { memory_region_init_io(&state->io_mr, owner, &nvdimm_dsm_ops, state, "nvdimm-acpi-io", NVDIMM_ACPI_IO_LEN); memory_region_add_subregion(io, NVDIMM_ACPI_IO_BASE, &state->io_mr); state->dsm_mem = g_array_new(false, true /* clear */, 1); acpi_data_push(state->dsm_mem, sizeof(NvdimmDsmIn)); fw_cfg_add_file(fw_cfg, NVDIMM_DSM_MEM_FILE, state->dsm_mem->data, state->dsm_mem->len); } #define NVDIMM_COMMON_DSM "NCAL" #define NVDIMM_ACPI_MEM_ADDR "MEMA" static void nvdimm_build_common_dsm(Aml *dev) { Aml *method, *ifctx, *function, *handle, *uuid, *dsm_mem, *result_size; Aml *elsectx, *unsupport, *unpatched, *expected_uuid, *uuid_invalid; Aml *pckg, *pckg_index, *pckg_buf, *field, *dsm_out_buf; uint8_t byte_list[1]; method = aml_method(NVDIMM_COMMON_DSM, 5, AML_SERIALIZED); uuid = aml_arg(0); function = aml_arg(2); handle = aml_arg(4); dsm_mem = aml_local(6); dsm_out_buf = aml_local(7); aml_append(method, aml_store(aml_name(NVDIMM_ACPI_MEM_ADDR), dsm_mem)); /* map DSM memory and IO into ACPI namespace. */ aml_append(method, aml_operation_region("NPIO", AML_SYSTEM_IO, aml_int(NVDIMM_ACPI_IO_BASE), NVDIMM_ACPI_IO_LEN)); aml_append(method, aml_operation_region("NRAM", AML_SYSTEM_MEMORY, dsm_mem, sizeof(NvdimmDsmIn))); /* * DSM notifier: * NTFI: write the address of DSM memory and notify QEMU to emulate * the access. * * It is the IO port so that accessing them will cause VM-exit, the * control will be transferred to QEMU. */ field = aml_field("NPIO", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE); aml_append(field, aml_named_field("NTFI", sizeof(uint32_t) * BITS_PER_BYTE)); aml_append(method, field); /* * DSM input: * HDLE: store device's handle, it's zero if the _DSM call happens * on NVDIMM Root Device. * REVS: store the Arg1 of _DSM call. * FUNC: store the Arg2 of _DSM call. * FARG: store the Arg3 of _DSM call which is a Package containing * function-specific arguments. * * They are RAM mapping on host so that these accesses never cause * VM-EXIT. */ field = aml_field("NRAM", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE); aml_append(field, aml_named_field("HDLE", sizeof(typeof_field(NvdimmDsmIn, handle)) * BITS_PER_BYTE)); aml_append(field, aml_named_field("REVS", sizeof(typeof_field(NvdimmDsmIn, revision)) * BITS_PER_BYTE)); aml_append(field, aml_named_field("FUNC", sizeof(typeof_field(NvdimmDsmIn, function)) * BITS_PER_BYTE)); aml_append(field, aml_named_field("FARG", (sizeof(NvdimmDsmIn) - offsetof(NvdimmDsmIn, arg3)) * BITS_PER_BYTE)); aml_append(method, field); /* * DSM output: * RLEN: the size of the buffer filled by QEMU. * ODAT: the buffer QEMU uses to store the result. * * Since the page is reused by both input and out, the input data * will be lost after storing new result into ODAT so we should fetch * all the input data before writing the result. */ field = aml_field("NRAM", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE); aml_append(field, aml_named_field("RLEN", sizeof(typeof_field(NvdimmDsmOut, len)) * BITS_PER_BYTE)); aml_append(field, aml_named_field("ODAT", (sizeof(NvdimmDsmOut) - offsetof(NvdimmDsmOut, data)) * BITS_PER_BYTE)); aml_append(method, field); /* * do not support any method if DSM memory address has not been * patched. */ unpatched = aml_equal(dsm_mem, aml_int(0x0)); expected_uuid = aml_local(0); ifctx = aml_if(aml_equal(handle, aml_int(0x0))); aml_append(ifctx, aml_store( aml_touuid("2F10E7A4-9E91-11E4-89D3-123B93F75CBA") /* UUID for NVDIMM Root Device */, expected_uuid)); aml_append(method, ifctx); elsectx = aml_else(); aml_append(elsectx, aml_store( aml_touuid("4309AC30-0D11-11E4-9191-0800200C9A66") /* UUID for NVDIMM Devices */, expected_uuid)); aml_append(method, elsectx); uuid_invalid = aml_lnot(aml_equal(uuid, expected_uuid)); unsupport = aml_if(aml_or(unpatched, uuid_invalid, NULL)); /* * function 0 is called to inquire what functions are supported by * OSPM */ ifctx = aml_if(aml_equal(function, aml_int(0))); byte_list[0] = 0 /* No function Supported */; aml_append(ifctx, aml_return(aml_buffer(1, byte_list))); aml_append(unsupport, ifctx); /* No function is supported yet. */ byte_list[0] = 1 /* Not Supported */; aml_append(unsupport, aml_return(aml_buffer(1, byte_list))); aml_append(method, unsupport); /* * The HDLE indicates the DSM function is issued from which device, * it reserves 0 for root device and is the handle for NVDIMM devices. * See the comments in nvdimm_slot_to_handle(). */ aml_append(method, aml_store(handle, aml_name("HDLE"))); aml_append(method, aml_store(aml_arg(1), aml_name("REVS"))); aml_append(method, aml_store(aml_arg(2), aml_name("FUNC"))); /* * The fourth parameter (Arg3) of _DSM is a package which contains * a buffer, the layout of the buffer is specified by UUID (Arg0), * Revision ID (Arg1) and Function Index (Arg2) which are documented * in the DSM Spec. */ pckg = aml_arg(3); ifctx = aml_if(aml_and(aml_equal(aml_object_type(pckg), aml_int(4 /* Package */)) /* It is a Package? */, aml_equal(aml_sizeof(pckg), aml_int(1)) /* 1 element? */, NULL)); pckg_index = aml_local(2); pckg_buf = aml_local(3); aml_append(ifctx, aml_store(aml_index(pckg, aml_int(0)), pckg_index)); aml_append(ifctx, aml_store(aml_derefof(pckg_index), pckg_buf)); aml_append(ifctx, aml_store(pckg_buf, aml_name("FARG"))); aml_append(method, ifctx); /* * tell QEMU about the real address of DSM memory, then QEMU * gets the control and fills the result in DSM memory. */ aml_append(method, aml_store(dsm_mem, aml_name("NTFI"))); result_size = aml_local(1); /* RLEN is not included in the payload returned to guest. */ aml_append(method, aml_subtract(aml_name("RLEN"), aml_int(4), result_size)); aml_append(method, aml_store(aml_shiftleft(result_size, aml_int(3)), result_size)); aml_append(method, aml_create_field(aml_name("ODAT"), aml_int(0), result_size, "OBUF")); aml_append(method, aml_concatenate(aml_buffer(0, NULL), aml_name("OBUF"), dsm_out_buf)); aml_append(method, aml_return(dsm_out_buf)); aml_append(dev, method); } static void nvdimm_build_device_dsm(Aml *dev, uint32_t handle) { Aml *method; method = aml_method("_DSM", 4, AML_NOTSERIALIZED); aml_append(method, aml_return(aml_call5(NVDIMM_COMMON_DSM, aml_arg(0), aml_arg(1), aml_arg(2), aml_arg(3), aml_int(handle)))); aml_append(dev, method); } static void nvdimm_build_nvdimm_devices(GSList *device_list, Aml *root_dev) { for (; device_list; device_list = device_list->next) { DeviceState *dev = device_list->data; int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, NULL); uint32_t handle = nvdimm_slot_to_handle(slot); Aml *nvdimm_dev; nvdimm_dev = aml_device("NV%02X", slot); /* * ACPI 6.0: 9.20 NVDIMM Devices: * * _ADR object that is used to supply OSPM with unique address * of the NVDIMM device. This is done by returning the NFIT Device * handle that is used to identify the associated entries in ACPI * table NFIT or _FIT. */ aml_append(nvdimm_dev, aml_name_decl("_ADR", aml_int(handle))); nvdimm_build_device_dsm(nvdimm_dev, handle); aml_append(root_dev, nvdimm_dev); } } static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets, GArray *table_data, BIOSLinker *linker, GArray *dsm_dma_arrea) { Aml *ssdt, *sb_scope, *dev; int mem_addr_offset, nvdimm_ssdt; acpi_add_table(table_offsets, table_data); ssdt = init_aml_allocator(); acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader)); sb_scope = aml_scope("\\_SB"); dev = aml_device("NVDR"); /* * ACPI 6.0: 9.20 NVDIMM Devices: * * The ACPI Name Space device uses _HID of ACPI0012 to identify the root * NVDIMM interface device. Platform firmware is required to contain one * such device in _SB scope if NVDIMMs support is exposed by platform to * OSPM. * For each NVDIMM present or intended to be supported by platform, * platform firmware also exposes an ACPI Namespace Device under the * root device. */ aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0012"))); nvdimm_build_common_dsm(dev); /* 0 is reserved for root device. */ nvdimm_build_device_dsm(dev, 0); nvdimm_build_nvdimm_devices(device_list, dev); aml_append(sb_scope, dev); aml_append(ssdt, sb_scope); nvdimm_ssdt = table_data->len; /* copy AML table into ACPI tables blob and patch header there */ g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len); mem_addr_offset = build_append_named_dword(table_data, NVDIMM_ACPI_MEM_ADDR); bios_linker_loader_alloc(linker, NVDIMM_DSM_MEM_FILE, dsm_dma_arrea, sizeof(NvdimmDsmIn), false /* high memory */); bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE, mem_addr_offset, sizeof(uint32_t), NVDIMM_DSM_MEM_FILE, 0); build_header(linker, table_data, (void *)(table_data->data + nvdimm_ssdt), "SSDT", table_data->len - nvdimm_ssdt, 1, NULL, "NVDIMM"); free_aml_allocator(); } void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data, BIOSLinker *linker, GArray *dsm_dma_arrea) { GSList *device_list; /* no NVDIMM device is plugged. */ device_list = nvdimm_get_plugged_device_list(); if (!device_list) { return; } nvdimm_build_nfit(device_list, table_offsets, table_data, linker); nvdimm_build_ssdt(device_list, table_offsets, table_data, linker, dsm_dma_arrea); g_slist_free(device_list); }