d6fb213a62
Introduce a parameter, 'label-size', which is the size of nvdimm label data area which is reserved at the end of backend memory. It is required at least 128k Two callbacks, read_label_data() and write_label_data(), are used to operate the label area Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/*
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* Non-Volatile Dual In-line Memory Module Virtualization Implementation
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*
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* Copyright(C) 2015 Intel Corporation.
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*
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* Author:
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* Xiao Guangrong <guangrong.xiao@linux.intel.com>
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*
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* NVDIMM specifications and some documents can be found at:
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* NVDIMM ACPI device and NFIT are introduced in ACPI 6:
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* http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
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* NVDIMM Namespace specification:
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* http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
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* DSM Interface Example:
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* http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
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* Driver Writer's Guide:
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* http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_NVDIMM_H
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#define QEMU_NVDIMM_H
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#include "hw/mem/pc-dimm.h"
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#include "hw/acpi/bios-linker-loader.h"
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#define NVDIMM_DEBUG 0
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#define nvdimm_debug(fmt, ...) \
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do { \
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if (NVDIMM_DEBUG) { \
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fprintf(stderr, "nvdimm: " fmt, ## __VA_ARGS__); \
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} \
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} while (0)
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/*
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* The minimum label data size is required by NVDIMM Namespace
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* specification, see the chapter 2 Namespaces:
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* "NVDIMMs following the NVDIMM Block Mode Specification use an area
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* at least 128KB in size, which holds around 1000 labels."
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*/
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#define MIN_NAMESPACE_LABEL_SIZE (128UL << 10)
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#define TYPE_NVDIMM "nvdimm"
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#define NVDIMM(obj) OBJECT_CHECK(NVDIMMDevice, (obj), TYPE_NVDIMM)
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#define NVDIMM_CLASS(oc) OBJECT_CLASS_CHECK(NVDIMMClass, (oc), TYPE_NVDIMM)
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#define NVDIMM_GET_CLASS(obj) OBJECT_GET_CLASS(NVDIMMClass, (obj), \
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TYPE_NVDIMM)
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struct NVDIMMDevice {
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/* private */
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PCDIMMDevice parent_obj;
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/* public */
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/*
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* the size of label data in NVDIMM device which is presented to
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* guest via __DSM "Get Namespace Label Size" function.
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*/
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uint64_t label_size;
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/*
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* the address of label data which is read by __DSM "Get Namespace
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* Label Data" function and written by __DSM "Set Namespace Label
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* Data" function.
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*/
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void *label_data;
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/*
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* it's the PMEM region in NVDIMM device, which is presented to
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* guest via ACPI NFIT and _FIT method if NVDIMM hotplug is supported.
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*/
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MemoryRegion nvdimm_mr;
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};
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typedef struct NVDIMMDevice NVDIMMDevice;
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struct NVDIMMClass {
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/* private */
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PCDIMMDeviceClass parent_class;
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/* public */
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/* read @size bytes from NVDIMM label data at @offset into @buf. */
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void (*read_label_data)(NVDIMMDevice *nvdimm, void *buf,
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uint64_t size, uint64_t offset);
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/* write @size bytes from @buf to NVDIMM label data at @offset. */
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void (*write_label_data)(NVDIMMDevice *nvdimm, const void *buf,
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uint64_t size, uint64_t offset);
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};
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typedef struct NVDIMMClass NVDIMMClass;
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#define NVDIMM_DSM_MEM_FILE "etc/acpi/nvdimm-mem"
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/*
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* 32 bits IO port starting from 0x0a18 in guest is reserved for
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* NVDIMM ACPI emulation.
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*/
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#define NVDIMM_ACPI_IO_BASE 0x0a18
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#define NVDIMM_ACPI_IO_LEN 4
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struct AcpiNVDIMMState {
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/* detect if NVDIMM support is enabled. */
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bool is_enabled;
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/* the data of the fw_cfg file NVDIMM_DSM_MEM_FILE. */
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GArray *dsm_mem;
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/* the IO region used by OSPM to transfer control to QEMU. */
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MemoryRegion io_mr;
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};
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typedef struct AcpiNVDIMMState AcpiNVDIMMState;
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void nvdimm_init_acpi_state(AcpiNVDIMMState *state, MemoryRegion *io,
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FWCfgState *fw_cfg, Object *owner);
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void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data,
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BIOSLinker *linker, GArray *dsm_dma_arrea);
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#endif
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