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xemu/hw/acpi/nvdimm.c
Haozhong Zhang cb836434cd nvdimm: add 'unarmed' option 
Currently the only vNVDIMM backend can guarantee the guest write
persistence is device DAX on Linux, because no host-side kernel cache
is involved in the guest access to it. The approach to detect whether
the backend is device DAX needs to access sysfs, which may not work
with SELinux.

Instead, we add the 'unarmed' option to device 'nvdimm', so that users
or management utils, which have enough knowledge about the backend,
can control the unarmed flag in guest ACPI NFIT via this option. The
guest Linux NVDIMM driver, for example, will mark the corresponding
vNVDIMM device read-only if the unarmed flag in guest NFIT is set.

The default value of 'unarmed' option is 'off' in order to keep the
backwards compatibility.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Message-Id: <20171211072806.2812-4-haozhong.zhang@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2018-01-19 11:18:51 -02:00

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/*
* NVDIMM ACPI Implementation
*
* Copyright(C) 2015 Intel Corporation.
*
* Author:
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
*
* 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 <http://www.gnu.org/licenses/>
*/
#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_device_list(Object *obj, void *opaque)
{
GSList **list = opaque;
if (object_dynamic_cast(obj, TYPE_NVDIMM)) {
*list = g_slist_append(*list, DEVICE(obj));
}
object_child_foreach(obj, nvdimm_device_list, opaque);
return 0;
}
/*
* inquire 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_device_list(void)
{
GSList *list = NULL;
object_child_foreach(qdev_get_machine(), nvdimm_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;
#define ACPI_NFIT_MEM_NOT_ARMED (1 << 3)
/*
* 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_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_uint(OBJECT(dev), PC_DIMM_ADDR_PROP,
NULL);
uint64_t size = object_property_get_uint(OBJECT(dev), PC_DIMM_SIZE_PROP,
NULL);
uint32_t node = object_property_get_uint(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;
NVDIMMDevice *nvdimm = NVDIMM(OBJECT(dev));
uint64_t size = object_property_get_uint(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);
if (nvdimm->unarmed) {
nfit_memdev->flags |= cpu_to_le16(ACPI_NFIT_MEM_NOT_ARMED);
}
}
/*
* 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(0x301 /* Format Interface Code:
Byte addressable, no energy backed.
See ACPI 6.2, sect 5.2.25.6 and
JEDEC Annex L Release 3. */);
}
static GArray *nvdimm_build_device_structure(void)
{
GSList *device_list = nvdimm_get_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);
}
g_slist_free(device_list);
return structures;
}
static void nvdimm_init_fit_buffer(NvdimmFitBuffer *fit_buf)
{
fit_buf->fit = g_array_new(false, true /* clear */, 1);
}
static void nvdimm_build_fit_buffer(NvdimmFitBuffer *fit_buf)
{
g_array_free(fit_buf->fit, true);
fit_buf->fit = nvdimm_build_device_structure();
fit_buf->dirty = true;
}
void nvdimm_plug(AcpiNVDIMMState *state)
{
nvdimm_build_fit_buffer(&state->fit_buf);
}
static void nvdimm_build_nfit(AcpiNVDIMMState *state, GArray *table_offsets,
GArray *table_data, BIOSLinker *linker)
{
NvdimmFitBuffer *fit_buf = &state->fit_buf;
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, fit_buf->fit->data, fit_buf->fit->len);
build_header(linker, table_data,
(void *)(table_data->data + header), "NFIT",
sizeof(NvdimmNfitHeader) + fit_buf->fit->len, 1, NULL, NULL);
}
#define NVDIMM_DSM_MEMORY_SIZE 4096
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) != NVDIMM_DSM_MEMORY_SIZE);
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) != NVDIMM_DSM_MEMORY_SIZE);
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) > NVDIMM_DSM_MEMORY_SIZE);
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) > NVDIMM_DSM_MEMORY_SIZE);
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) > NVDIMM_DSM_MEMORY_SIZE);
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) > NVDIMM_DSM_MEMORY_SIZE);
struct NvdimmFuncReadFITIn {
uint32_t offset; /* the offset into FIT buffer. */
} QEMU_PACKED;
typedef struct NvdimmFuncReadFITIn NvdimmFuncReadFITIn;
QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncReadFITIn) +
offsetof(NvdimmDsmIn, arg3) > NVDIMM_DSM_MEMORY_SIZE);
struct NvdimmFuncReadFITOut {
/* the size of buffer filled by QEMU. */
uint32_t len;
uint32_t func_ret_status; /* return status code. */
uint8_t fit[0]; /* the FIT data. */
} QEMU_PACKED;
typedef struct NvdimmFuncReadFITOut NvdimmFuncReadFITOut;
QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncReadFITOut) > NVDIMM_DSM_MEMORY_SIZE);
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));
}
#define NVDIMM_DSM_RET_STATUS_SUCCESS 0 /* Success */
#define NVDIMM_DSM_RET_STATUS_UNSUPPORT 1 /* Not Supported */
#define NVDIMM_DSM_RET_STATUS_NOMEMDEV 2 /* Non-Existing Memory Device */
#define NVDIMM_DSM_RET_STATUS_INVALID 3 /* Invalid Input Parameters */
#define NVDIMM_DSM_RET_STATUS_FIT_CHANGED 0x100 /* FIT Changed */
#define NVDIMM_QEMU_RSVD_HANDLE_ROOT 0x10000
/* Read FIT data, defined in docs/specs/acpi_nvdimm.txt. */
static void nvdimm_dsm_func_read_fit(AcpiNVDIMMState *state, NvdimmDsmIn *in,
hwaddr dsm_mem_addr)
{
NvdimmFitBuffer *fit_buf = &state->fit_buf;
NvdimmFuncReadFITIn *read_fit;
NvdimmFuncReadFITOut *read_fit_out;
GArray *fit;
uint32_t read_len = 0, func_ret_status;
int size;
read_fit = (NvdimmFuncReadFITIn *)in->arg3;
le32_to_cpus(&read_fit->offset);
fit = fit_buf->fit;
nvdimm_debug("Read FIT: offset %#x FIT size %#x Dirty %s.\n",
read_fit->offset, fit->len, fit_buf->dirty ? "Yes" : "No");
if (read_fit->offset > fit->len) {
func_ret_status = NVDIMM_DSM_RET_STATUS_INVALID;
goto exit;
}
/* It is the first time to read FIT. */
if (!read_fit->offset) {
fit_buf->dirty = false;
} else if (fit_buf->dirty) { /* FIT has been changed during RFIT. */
func_ret_status = NVDIMM_DSM_RET_STATUS_FIT_CHANGED;
goto exit;
}
func_ret_status = NVDIMM_DSM_RET_STATUS_SUCCESS;
read_len = MIN(fit->len - read_fit->offset,
NVDIMM_DSM_MEMORY_SIZE - sizeof(NvdimmFuncReadFITOut));
exit:
size = sizeof(NvdimmFuncReadFITOut) + read_len;
read_fit_out = g_malloc(size);
read_fit_out->len = cpu_to_le32(size);
read_fit_out->func_ret_status = cpu_to_le32(func_ret_status);
memcpy(read_fit_out->fit, fit->data + read_fit->offset, read_len);
cpu_physical_memory_write(dsm_mem_addr, read_fit_out, size);
g_free(read_fit_out);
}
static void
nvdimm_dsm_handle_reserved_root_method(AcpiNVDIMMState *state,
NvdimmDsmIn *in, hwaddr dsm_mem_addr)
{
switch (in->function) {
case 0x0:
nvdimm_dsm_function0(0x1 | 1 << 1 /* Read FIT */, dsm_mem_addr);
return;
case 0x1 /* Read FIT */:
nvdimm_dsm_func_read_fit(state, in, dsm_mem_addr);
return;
}
nvdimm_dsm_no_payload(NVDIMM_DSM_RET_STATUS_UNSUPPORT, dsm_mem_addr);
}
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(NVDIMM_DSM_RET_STATUS_UNSUPPORT, 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;
dsm_memory_size = NVDIMM_DSM_MEMORY_SIZE;
/*
* 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(NVDIMM_DSM_RET_STATUS_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 = NVDIMM_DSM_RET_STATUS_INVALID;
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 NVDIMM_DSM_RET_STATUS_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 != NVDIMM_DSM_RET_STATUS_SUCCESS) {
nvdimm_dsm_no_payload(status, dsm_mem_addr);
return;
}
size = sizeof(*get_label_data_out) + get_label_data->length;
assert(size <= NVDIMM_DSM_MEMORY_SIZE);
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(NVDIMM_DSM_RET_STATUS_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 != NVDIMM_DSM_RET_STATUS_SUCCESS) {
nvdimm_dsm_no_payload(status, dsm_mem_addr);
return;
}
assert(offsetof(NvdimmDsmIn, arg3) + sizeof(*set_label_data) +
set_label_data->length <= NVDIMM_DSM_MEMORY_SIZE);
nvc->write_label_data(nvdimm, set_label_data->in_buf,
set_label_data->length, set_label_data->offset);
nvdimm_dsm_no_payload(NVDIMM_DSM_RET_STATUS_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(NVDIMM_DSM_RET_STATUS_NOMEMDEV,
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(NVDIMM_DSM_RET_STATUS_UNSUPPORT, 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)
{
AcpiNVDIMMState *state = opaque;
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(NVDIMM_DSM_RET_STATUS_UNSUPPORT, dsm_mem_addr);
goto exit;
}
if (in->handle == NVDIMM_QEMU_RSVD_HANDLE_ROOT) {
nvdimm_dsm_handle_reserved_root_method(state, in, 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_acpi_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev)
{
if (dev->hotplugged) {
acpi_send_event(DEVICE(hotplug_dev), ACPI_NVDIMM_HOTPLUG_STATUS);
}
}
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);
nvdimm_init_fit_buffer(&state->fit_buf);
}
#define NVDIMM_COMMON_DSM "NCAL"
#define NVDIMM_ACPI_MEM_ADDR "MEMA"
#define NVDIMM_DSM_MEMORY "NRAM"
#define NVDIMM_DSM_IOPORT "NPIO"
#define NVDIMM_DSM_NOTIFY "NTFI"
#define NVDIMM_DSM_HANDLE "HDLE"
#define NVDIMM_DSM_REVISION "REVS"
#define NVDIMM_DSM_FUNCTION "FUNC"
#define NVDIMM_DSM_ARG3 "FARG"
#define NVDIMM_DSM_OUT_BUF_SIZE "RLEN"
#define NVDIMM_DSM_OUT_BUF "ODAT"
#define NVDIMM_DSM_RFIT_STATUS "RSTA"
#define NVDIMM_QEMU_RSVD_UUID "648B9CF2-CDA1-4312-8AD9-49C4AF32BD62"
static void nvdimm_build_common_dsm(Aml *dev)
{
Aml *method, *ifctx, *function, *handle, *uuid, *dsm_mem, *elsectx2;
Aml *elsectx, *unsupport, *unpatched, *expected_uuid, *uuid_invalid;
Aml *pckg, *pckg_index, *pckg_buf, *field, *dsm_out_buf, *dsm_out_buf_size;
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(NVDIMM_DSM_IOPORT, AML_SYSTEM_IO,
aml_int(NVDIMM_ACPI_IO_BASE), NVDIMM_ACPI_IO_LEN));
aml_append(method, aml_operation_region(NVDIMM_DSM_MEMORY,
AML_SYSTEM_MEMORY, dsm_mem, sizeof(NvdimmDsmIn)));
/*
* DSM notifier:
* NVDIMM_DSM_NOTIFY: 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(NVDIMM_DSM_IOPORT, AML_DWORD_ACC, AML_NOLOCK,
AML_PRESERVE);
aml_append(field, aml_named_field(NVDIMM_DSM_NOTIFY,
sizeof(uint32_t) * BITS_PER_BYTE));
aml_append(method, field);
/*
* DSM input:
* NVDIMM_DSM_HANDLE: store device's handle, it's zero if the _DSM call
* happens on NVDIMM Root Device.
* NVDIMM_DSM_REVISION: store the Arg1 of _DSM call.
* NVDIMM_DSM_FUNCTION: store the Arg2 of _DSM call.
* NVDIMM_DSM_ARG3: 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(NVDIMM_DSM_MEMORY, AML_DWORD_ACC, AML_NOLOCK,
AML_PRESERVE);
aml_append(field, aml_named_field(NVDIMM_DSM_HANDLE,
sizeof(typeof_field(NvdimmDsmIn, handle)) * BITS_PER_BYTE));
aml_append(field, aml_named_field(NVDIMM_DSM_REVISION,
sizeof(typeof_field(NvdimmDsmIn, revision)) * BITS_PER_BYTE));
aml_append(field, aml_named_field(NVDIMM_DSM_FUNCTION,
sizeof(typeof_field(NvdimmDsmIn, function)) * BITS_PER_BYTE));
aml_append(field, aml_named_field(NVDIMM_DSM_ARG3,
(sizeof(NvdimmDsmIn) - offsetof(NvdimmDsmIn, arg3)) * BITS_PER_BYTE));
aml_append(method, field);
/*
* DSM output:
* NVDIMM_DSM_OUT_BUF_SIZE: the size of the buffer filled by QEMU.
* NVDIMM_DSM_OUT_BUF: 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(NVDIMM_DSM_MEMORY, AML_DWORD_ACC, AML_NOLOCK,
AML_PRESERVE);
aml_append(field, aml_named_field(NVDIMM_DSM_OUT_BUF_SIZE,
sizeof(typeof_field(NvdimmDsmOut, len)) * BITS_PER_BYTE));
aml_append(field, aml_named_field(NVDIMM_DSM_OUT_BUF,
(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();
ifctx = aml_if(aml_equal(handle, aml_int(NVDIMM_QEMU_RSVD_HANDLE_ROOT)));
aml_append(ifctx, aml_store(aml_touuid(NVDIMM_QEMU_RSVD_UUID
/* UUID for QEMU internal use */), expected_uuid));
aml_append(elsectx, ifctx);
elsectx2 = aml_else();
aml_append(elsectx2, aml_store(
aml_touuid("4309AC30-0D11-11E4-9191-0800200C9A66")
/* UUID for NVDIMM Devices */, expected_uuid));
aml_append(elsectx, elsectx2);
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] = NVDIMM_DSM_RET_STATUS_UNSUPPORT;
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(NVDIMM_DSM_HANDLE)));
aml_append(method, aml_store(aml_arg(1), aml_name(NVDIMM_DSM_REVISION)));
aml_append(method, aml_store(aml_arg(2), aml_name(NVDIMM_DSM_FUNCTION)));
/*
* 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(NVDIMM_DSM_ARG3)));
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(NVDIMM_DSM_NOTIFY)));
dsm_out_buf_size = aml_local(1);
/* RLEN is not included in the payload returned to guest. */
aml_append(method, aml_subtract(aml_name(NVDIMM_DSM_OUT_BUF_SIZE),
aml_int(4), dsm_out_buf_size));
aml_append(method, aml_store(aml_shiftleft(dsm_out_buf_size, aml_int(3)),
dsm_out_buf_size));
aml_append(method, aml_create_field(aml_name(NVDIMM_DSM_OUT_BUF),
aml_int(0), dsm_out_buf_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_fit(Aml *dev)
{
Aml *method, *pkg, *buf, *buf_size, *offset, *call_result;
Aml *whilectx, *ifcond, *ifctx, *elsectx, *fit;
buf = aml_local(0);
buf_size = aml_local(1);
fit = aml_local(2);
aml_append(dev, aml_name_decl(NVDIMM_DSM_RFIT_STATUS, aml_int(0)));
/* build helper function, RFIT. */
method = aml_method("RFIT", 1, AML_SERIALIZED);
aml_append(method, aml_name_decl("OFST", aml_int(0)));
/* prepare input package. */
pkg = aml_package(1);
aml_append(method, aml_store(aml_arg(0), aml_name("OFST")));
aml_append(pkg, aml_name("OFST"));
/* call Read_FIT function. */
call_result = aml_call5(NVDIMM_COMMON_DSM,
aml_touuid(NVDIMM_QEMU_RSVD_UUID),
aml_int(1) /* Revision 1 */,
aml_int(0x1) /* Read FIT */,
pkg, aml_int(NVDIMM_QEMU_RSVD_HANDLE_ROOT));
aml_append(method, aml_store(call_result, buf));
/* handle _DSM result. */
aml_append(method, aml_create_dword_field(buf,
aml_int(0) /* offset at byte 0 */, "STAU"));
aml_append(method, aml_store(aml_name("STAU"),
aml_name(NVDIMM_DSM_RFIT_STATUS)));
/* if something is wrong during _DSM. */
ifcond = aml_equal(aml_int(NVDIMM_DSM_RET_STATUS_SUCCESS),
aml_name("STAU"));
ifctx = aml_if(aml_lnot(ifcond));
aml_append(ifctx, aml_return(aml_buffer(0, NULL)));
aml_append(method, ifctx);
aml_append(method, aml_store(aml_sizeof(buf), buf_size));
aml_append(method, aml_subtract(buf_size,
aml_int(4) /* the size of "STAU" */,
buf_size));
/* if we read the end of fit. */
ifctx = aml_if(aml_equal(buf_size, aml_int(0)));
aml_append(ifctx, aml_return(aml_buffer(0, NULL)));
aml_append(method, ifctx);
aml_append(method, aml_create_field(buf,
aml_int(4 * BITS_PER_BYTE), /* offset at byte 4.*/
aml_shiftleft(buf_size, aml_int(3)), "BUFF"));
aml_append(method, aml_return(aml_name("BUFF")));
aml_append(dev, method);
/* build _FIT. */
method = aml_method("_FIT", 0, AML_SERIALIZED);
offset = aml_local(3);
aml_append(method, aml_store(aml_buffer(0, NULL), fit));
aml_append(method, aml_store(aml_int(0), offset));
whilectx = aml_while(aml_int(1));
aml_append(whilectx, aml_store(aml_call1("RFIT", offset), buf));
aml_append(whilectx, aml_store(aml_sizeof(buf), buf_size));
/*
* if fit buffer was changed during RFIT, read from the beginning
* again.
*/
ifctx = aml_if(aml_equal(aml_name(NVDIMM_DSM_RFIT_STATUS),
aml_int(NVDIMM_DSM_RET_STATUS_FIT_CHANGED)));
aml_append(ifctx, aml_store(aml_buffer(0, NULL), fit));
aml_append(ifctx, aml_store(aml_int(0), offset));
aml_append(whilectx, ifctx);
elsectx = aml_else();
/* finish fit read if no data is read out. */
ifctx = aml_if(aml_equal(buf_size, aml_int(0)));
aml_append(ifctx, aml_return(fit));
aml_append(elsectx, ifctx);
/* update the offset. */
aml_append(elsectx, aml_add(offset, buf_size, offset));
/* append the data we read out to the fit buffer. */
aml_append(elsectx, aml_concatenate(fit, buf, fit));
aml_append(whilectx, elsectx);
aml_append(method, whilectx);
aml_append(dev, method);
}
static void nvdimm_build_nvdimm_devices(Aml *root_dev, uint32_t ram_slots)
{
uint32_t slot;
for (slot = 0; slot < ram_slots; slot++) {
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(GArray *table_offsets, GArray *table_data,
BIOSLinker *linker, GArray *dsm_dma_arrea,
uint32_t ram_slots)
{
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_fit(dev);
nvdimm_build_nvdimm_devices(dev, ram_slots);
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, AcpiNVDIMMState *state,
uint32_t ram_slots)
{
GSList *device_list;
/* no nvdimm device can be plugged. */
if (!ram_slots) {
return;
}
nvdimm_build_ssdt(table_offsets, table_data, linker, state->dsm_mem,
ram_slots);
device_list = nvdimm_get_device_list();
/* no NVDIMM device is plugged. */
if (!device_list) {
return;
}
nvdimm_build_nfit(state, table_offsets, table_data, linker);
g_slist_free(device_list);
}
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