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Memory devices may specify volatile only, persistent only, and partitionable space which when added together result in a total capacity. If Identify Memory Device.Partition Alignment != 0 the device supports partitionable space. This partitionable space can be split between volatile and persistent space. The total volatile and persistent sizes are reported in Get Partition Info. ie active volatile memory = volatile only + partitionable volatile active persistent memory = persistent only + partitionable persistent Define cxl_mem_get_partition(), check for partitionable support, and use cxl_mem_get_partition() if applicable. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright(c) 2020-2021 Intel Corporation. */
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#ifndef __CXL_MEM_H__
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#define __CXL_MEM_H__
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#include <linux/cdev.h>
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#include "cxl.h"
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/* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */
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#define CXLMDEV_STATUS_OFFSET 0x0
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#define CXLMDEV_DEV_FATAL BIT(0)
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#define CXLMDEV_FW_HALT BIT(1)
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#define CXLMDEV_STATUS_MEDIA_STATUS_MASK GENMASK(3, 2)
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#define CXLMDEV_MS_NOT_READY 0
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#define CXLMDEV_MS_READY 1
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#define CXLMDEV_MS_ERROR 2
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#define CXLMDEV_MS_DISABLED 3
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#define CXLMDEV_READY(status) \
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(FIELD_GET(CXLMDEV_STATUS_MEDIA_STATUS_MASK, status) == \
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CXLMDEV_MS_READY)
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#define CXLMDEV_MBOX_IF_READY BIT(4)
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#define CXLMDEV_RESET_NEEDED_MASK GENMASK(7, 5)
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#define CXLMDEV_RESET_NEEDED_NOT 0
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#define CXLMDEV_RESET_NEEDED_COLD 1
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#define CXLMDEV_RESET_NEEDED_WARM 2
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#define CXLMDEV_RESET_NEEDED_HOT 3
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#define CXLMDEV_RESET_NEEDED_CXL 4
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#define CXLMDEV_RESET_NEEDED(status) \
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(FIELD_GET(CXLMDEV_RESET_NEEDED_MASK, status) != \
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CXLMDEV_RESET_NEEDED_NOT)
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/**
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* struct cdevm_file_operations - devm coordinated cdev file operations
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* @fops: file operations that are synchronized against @shutdown
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* @shutdown: disconnect driver data
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*
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* @shutdown is invoked in the devres release path to disconnect any
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* driver instance data from @dev. It assumes synchronization with any
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* fops operation that requires driver data. After @shutdown an
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* operation may only reference @device data.
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*/
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struct cdevm_file_operations {
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struct file_operations fops;
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void (*shutdown)(struct device *dev);
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};
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/**
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* struct cxl_memdev - CXL bus object representing a Type-3 Memory Device
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* @dev: driver core device object
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* @cdev: char dev core object for ioctl operations
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* @cxlm: pointer to the parent device driver data
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* @id: id number of this memdev instance.
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*/
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struct cxl_memdev {
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struct device dev;
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struct cdev cdev;
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struct cxl_mem *cxlm;
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int id;
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};
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static inline struct cxl_memdev *to_cxl_memdev(struct device *dev)
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{
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return container_of(dev, struct cxl_memdev, dev);
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}
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struct cxl_memdev *
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devm_cxl_add_memdev(struct device *host, struct cxl_mem *cxlm,
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const struct cdevm_file_operations *cdevm_fops);
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/**
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* struct cxl_mem - A CXL memory device
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* @pdev: The PCI device associated with this CXL device.
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* @cxlmd: Logical memory device chardev / interface
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* @regs: Parsed register blocks
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* @payload_size: Size of space for payload
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* (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register)
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* @lsa_size: Size of Label Storage Area
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* (CXL 2.0 8.2.9.5.1.1 Identify Memory Device)
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* @mbox_mutex: Mutex to synchronize mailbox access.
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* @firmware_version: Firmware version for the memory device.
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* @enabled_cmds: Hardware commands found enabled in CEL.
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* @pmem_range: Persistent memory capacity information.
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* @ram_range: Volatile memory capacity information.
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*/
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struct cxl_mem {
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struct pci_dev *pdev;
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struct cxl_memdev *cxlmd;
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struct cxl_regs regs;
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size_t payload_size;
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size_t lsa_size;
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struct mutex mbox_mutex; /* Protects device mailbox and firmware */
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char firmware_version[0x10];
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unsigned long *enabled_cmds;
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struct range pmem_range;
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struct range ram_range;
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u64 total_bytes;
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u64 volatile_only_bytes;
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u64 persistent_only_bytes;
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u64 partition_align_bytes;
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u64 active_volatile_bytes;
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u64 active_persistent_bytes;
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u64 next_volatile_bytes;
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u64 next_persistent_bytes;
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};
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#endif /* __CXL_MEM_H__ */
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