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/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright(c) 2020-2021 Intel Corporation. */
#ifndef __CXL_MEM_H__
#define __CXL_MEM_H__
#include <linux/cdev.h>
#include "cxl.h"
/* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */
#define CXLMDEV_STATUS_OFFSET 0x0
#define CXLMDEV_DEV_FATAL BIT(0)
#define CXLMDEV_FW_HALT BIT(1)
#define CXLMDEV_STATUS_MEDIA_STATUS_MASK GENMASK(3, 2)
#define CXLMDEV_MS_NOT_READY 0
#define CXLMDEV_MS_READY 1
#define CXLMDEV_MS_ERROR 2
#define CXLMDEV_MS_DISABLED 3
#define CXLMDEV_READY(status) \
(FIELD_GET(CXLMDEV_STATUS_MEDIA_STATUS_MASK, status) == \
CXLMDEV_MS_READY)
#define CXLMDEV_MBOX_IF_READY BIT(4)
#define CXLMDEV_RESET_NEEDED_MASK GENMASK(7, 5)
#define CXLMDEV_RESET_NEEDED_NOT 0
#define CXLMDEV_RESET_NEEDED_COLD 1
#define CXLMDEV_RESET_NEEDED_WARM 2
#define CXLMDEV_RESET_NEEDED_HOT 3
#define CXLMDEV_RESET_NEEDED_CXL 4
#define CXLMDEV_RESET_NEEDED(status) \
(FIELD_GET(CXLMDEV_RESET_NEEDED_MASK, status) != \
CXLMDEV_RESET_NEEDED_NOT)
/*
* An entire PCI topology full of devices should be enough for any
* config
*/
#define CXL_MEM_MAX_DEVS 65536
/**
* struct cxl_memdev - CXL bus object representing a Type-3 Memory Device
* @dev: driver core device object
* @cdev: char dev core object for ioctl operations
* @cxlm: pointer to the parent device driver data
* @id: id number of this memdev instance.
*/
struct cxl_memdev {
struct device dev;
struct cdev cdev;
struct cxl_mem *cxlm;
int id;
};
/**
* struct cxl_mem - A CXL memory device
* @pdev: The PCI device associated with this CXL device.
* @cxlmd: Logical memory device chardev / interface
* @regs: Parsed register blocks
* @payload_size: Size of space for payload
* (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register)
* @lsa_size: Size of Label Storage Area
* (CXL 2.0 8.2.9.5.1.1 Identify Memory Device)
* @mbox_mutex: Mutex to synchronize mailbox access.
* @firmware_version: Firmware version for the memory device.
* @enabled_cmds: Hardware commands found enabled in CEL.
* @pmem_range: Persistent memory capacity information.
* @ram_range: Volatile memory capacity information.
*/
struct cxl_mem {
struct pci_dev *pdev;
struct cxl_memdev *cxlmd;
struct cxl_regs regs;
size_t payload_size;
size_t lsa_size;
struct mutex mbox_mutex; /* Protects device mailbox and firmware */
char firmware_version[0x10];
unsigned long *enabled_cmds;
struct range pmem_range;
struct range ram_range;
};
#endif /* __CXL_MEM_H__ */
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