/* SPDX-License-Identifier: GPL-2.0
*
* Copyright 2008 - 2013 Solarflare Communications Inc .
* Copyright ( C ) 2022 - 2023 , Advanced Micro Devices , Inc .
*/
#ifndef CDX_MCDI_H
#define CDX_MCDI_H
#include <linux/mutex.h>
#include <linux/kref.h>
#include <linux/rpmsg.h>
#include "bitfield.h"
#include "mc_cdx_pcol.h"
#ifdef DEBUG
#define CDX_WARN_ON_ONCE_PARANOID(x) WARN_ON_ONCE(x)
#define CDX_WARN_ON_PARANOID(x) WARN_ON(x)
#else
#define CDX_WARN_ON_ONCE_PARANOID(x) do {} while (0 )
#define CDX_WARN_ON_PARANOID(x) do {} while (0 )
#endif
/**
* enum cdx_mcdi_mode - MCDI transaction mode
* @ MCDI_MODE_EVENTS : wait for an mcdi response callback .
* @ MCDI_MODE_FAIL : we think MCDI is dead , so fail - fast all calls
*/
enum cdx_mcdi_mode {
MCDI_MODE_EVENTS,
MCDI_MODE_FAIL,
};
#define MCDI_RPC_TIMEOUT (10 * HZ)
#define MCDI_RPC_LONG_TIMEOU (60 * HZ)
#define MCDI_RPC_POST_RST_TIME (10 * HZ)
#define MCDI_BUF_LEN (8 + MCDI_CTL_SDU_LEN_MAX)
/**
* enum cdx_mcdi_cmd_state - State for an individual MCDI command
* @ MCDI_STATE_QUEUED : Command not started and is waiting to run .
* @ MCDI_STATE_RETRY : Command was submitted and MC rejected with no resources ,
* as MC have too many outstanding commands . Command will be retried once
* another command returns .
* @ MCDI_STATE_RUNNING : Command was accepted and is running .
* @ MCDI_STATE_RUNNING_CANCELLED : Command is running but the issuer cancelled
* the command .
* @ MCDI_STATE_FINISHED : Processing of this command has completed .
*/
enum cdx_mcdi_cmd_state {
MCDI_STATE_QUEUED,
MCDI_STATE_RETRY,
MCDI_STATE_RUNNING,
MCDI_STATE_RUNNING_CANCELLED,
MCDI_STATE_FINISHED,
};
/**
* struct cdx_mcdi - CDX MCDI Firmware interface , to interact
* with CDX controller .
* @ mcdi : MCDI interface
* @ mcdi_ops : MCDI operations
* @ r5_rproc : R5 Remoteproc device handle
* @ rpdev : RPMsg device
* @ ept : RPMsg endpoint
* @ work : Post probe work
*/
struct cdx_mcdi {
/* MCDI interface */
struct cdx_mcdi_data *mcdi;
const struct cdx_mcdi_ops *mcdi_ops;
struct rproc *r5_rproc;
struct rpmsg_device *rpdev;
struct rpmsg_endpoint *ept;
struct work_struct work;
};
struct cdx_mcdi_ops {
void (*mcdi_request)(struct cdx_mcdi *cdx,
const struct cdx_dword *hdr, size_t hdr_len,
const struct cdx_dword *sdu, size_t sdu_len);
unsigned int (*mcdi_rpc_timeout)(struct cdx_mcdi *cdx, unsigned int cmd);
};
typedef void cdx_mcdi_async_completer(struct cdx_mcdi *cdx,
unsigned long cookie, int rc,
struct cdx_dword *outbuf,
size_t outlen_actual);
/**
* struct cdx_mcdi_cmd - An outstanding MCDI command
* @ ref : Reference count . There will be one reference if the command is
* in the mcdi_iface cmd_list , another if it ' s on a cleanup list ,
* and a third if it ' s queued in the work queue .
* @ list : The data for this entry in mcdi - > cmd_list
* @ cleanup_list : The data for this entry in a cleanup list
* @ work : The work item for this command , queued in mcdi - > workqueue
* @ mcdi : The mcdi_iface for this command
* @ state : The state of this command
* @ inlen : inbuf length
* @ inbuf : Input buffer
* @ quiet : Whether to silence errors
* @ reboot_seen : Whether a reboot has been seen during this command ,
* to prevent duplicates
* @ seq : Sequence number
* @ started : Jiffies this command was started at
* @ cookie : Context for completion function
* @ completer : Completion function
* @ handle : Command handle
* @ cmd : Command number
* @ rc : Return code
* @ outlen : Length of output buffer
* @ outbuf : Output buffer
*/
struct cdx_mcdi_cmd {
struct kref ref;
struct list_head list;
struct list_head cleanup_list;
struct work_struct work;
struct cdx_mcdi_iface *mcdi;
enum cdx_mcdi_cmd_state state;
size_t inlen;
const struct cdx_dword *inbuf;
bool quiet;
bool reboot_seen;
u8 seq;
unsigned long started;
unsigned long cookie;
cdx_mcdi_async_completer *completer;
unsigned int handle;
unsigned int cmd;
int rc;
size_t outlen;
struct cdx_dword *outbuf;
/* followed by inbuf data if necessary */
};
/**
* struct cdx_mcdi_iface - MCDI protocol context
* @ cdx : The associated NIC
* @ iface_lock : Serialise access to this structure
* @ outstanding_cleanups : Count of cleanups
* @ cmd_list : List of outstanding and running commands
* @ workqueue : Workqueue used for delayed processing
* @ cmd_complete_wq : Waitqueue for command completion
* @ db_held_by : Command the MC doorbell is in use by
* @ seq_held_by : Command each sequence number is in use by
* @ prev_handle : The last used command handle
* @ mode : Poll for mcdi completion , or wait for an mcdi_event
* @ prev_seq : The last used sequence number
* @ new_epoch : Indicates start of day or start of MC reboot recovery
*/
struct cdx_mcdi_iface {
struct cdx_mcdi *cdx;
/* Serialise access */
struct mutex iface_lock;
unsigned int outstanding_cleanups;
struct list_head cmd_list;
struct workqueue_struct *workqueue;
wait_queue_head_t cmd_complete_wq;
struct cdx_mcdi_cmd *db_held_by;
struct cdx_mcdi_cmd *seq_held_by[16 ];
unsigned int prev_handle;
enum cdx_mcdi_mode mode;
u8 prev_seq;
bool new_epoch;
};
/**
* struct cdx_mcdi_data - extra state for NICs that implement MCDI
* @ iface : Interface / protocol state
* @ fn_flags : Flags for this function , as returned by % MC_CMD_DRV_ATTACH .
*/
struct cdx_mcdi_data {
struct cdx_mcdi_iface iface;
u32 fn_flags;
};
static inline struct cdx_mcdi_iface *cdx_mcdi_if(struct cdx_mcdi *cdx)
{
return cdx->mcdi ? &cdx->mcdi->iface : NULL;
}
int cdx_mcdi_init(struct cdx_mcdi *cdx);
void cdx_mcdi_finish(struct cdx_mcdi *cdx);
void cdx_mcdi_process_cmd(struct cdx_mcdi *cdx, struct cdx_dword *outbuf, int len);
int cdx_mcdi_rpc(struct cdx_mcdi *cdx, unsigned int cmd,
const struct cdx_dword *inbuf, size_t inlen,
struct cdx_dword *outbuf, size_t outlen, size_t *outlen_actual);
int cdx_mcdi_rpc_async(struct cdx_mcdi *cdx, unsigned int cmd,
const struct cdx_dword *inbuf, size_t inlen,
cdx_mcdi_async_completer *complete,
unsigned long cookie);
int cdx_mcdi_wait_for_quiescence(struct cdx_mcdi *cdx,
unsigned int timeout_jiffies);
/*
* We expect that 16 - and 32 - bit fields in MCDI requests and responses
* are appropriately aligned , but 64 - bit fields are only
* 32 - bit - aligned .
*/
#define MCDI_DECLARE_BUF(_name, _len) struct cdx_dword _name[DIV_ROUND_UP(_len, 4 )] = {{0 }}
#define _MCDI_PTR(_buf, _offset) \
((u8 *)(_buf) + (_offset))
#define MCDI_PTR(_buf, _field) \
_MCDI_PTR(_buf, MC_CMD_ ## _field ## _OFST)
#define _MCDI_CHECK_ALIGN(_ofst, _align) \
((void )BUILD_BUG_ON_ZERO((_ofst) & ((_align) - 1 )), \
(_ofst))
#define _MCDI_DWORD(_buf, _field) \
((_buf) + (_MCDI_CHECK_ALIGN(MC_CMD_ ## _field ## _OFST, 4 ) >> 2 ))
#define MCDI_BYTE(_buf, _field) \
((void )BUILD_BUG_ON_ZERO(MC_CMD_ ## _field ## _LEN != 1 ), \
*MCDI_PTR(_buf, _field))
#define MCDI_WORD(_buf, _field) \
((void )BUILD_BUG_ON_ZERO(MC_CMD_ ## _field ## _LEN != 2 ), \
le16_to_cpu(*(__force const __le16 *)MCDI_PTR(_buf, _field)))
#define MCDI_SET_DWORD(_buf, _field, _value) \
CDX_POPULATE_DWORD_1(*_MCDI_DWORD(_buf, _field), CDX_DWORD, _value)
#define MCDI_DWORD(_buf, _field) \
CDX_DWORD_FIELD(*_MCDI_DWORD(_buf, _field), CDX_DWORD)
#define MCDI_POPULATE_DWORD_1(_buf, _field, _name1, _value1) \
CDX_POPULATE_DWORD_1(*_MCDI_DWORD(_buf, _field), \
MC_CMD_ ## _name1, _value1)
#define MCDI_SET_QWORD(_buf, _field, _value) \
do { \
CDX_POPULATE_DWORD_1(_MCDI_DWORD(_buf, _field)[0 ], \
CDX_DWORD, (u32)(_value)); \
CDX_POPULATE_DWORD_1(_MCDI_DWORD(_buf, _field)[1 ], \
CDX_DWORD, (u64)(_value) >> 32 ); \
} while (0 )
#define MCDI_QWORD(_buf, _field) \
(CDX_DWORD_FIELD(_MCDI_DWORD(_buf, _field)[0 ], CDX_DWORD) | \
(u64)CDX_DWORD_FIELD(_MCDI_DWORD(_buf, _field)[1 ], CDX_DWORD) << 32 )
#endif /* CDX_MCDI_H */
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