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cxlflash: Base support for IBM CXL Flash Adapter
SCSI device driver to support filesystem access on the IBM CXL Flash adapter. Supported-by: Stephen Bates <stephen.bates@pmcs.com> Reviewed-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com> Reviewed-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
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Jul 31, 2015
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# | ||
# IBM CXL-attached Flash Accelerator SCSI Driver | ||
# | ||
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config CXLFLASH | ||
tristate "Support for IBM CAPI Flash" | ||
depends on PCI && SCSI && CXL | ||
default m | ||
help | ||
Allows CAPI Accelerated IO to Flash | ||
If unsure, say N. |
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obj-$(CONFIG_CXLFLASH) += cxlflash.o | ||
cxlflash-y += main.o |
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/* | ||
* CXL Flash Device Driver | ||
* | ||
* Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation | ||
* Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation | ||
* | ||
* Copyright (C) 2015 IBM Corporation | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public License | ||
* as published by the Free Software Foundation; either version | ||
* 2 of the License, or (at your option) any later version. | ||
*/ | ||
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#ifndef _CXLFLASH_COMMON_H | ||
#define _CXLFLASH_COMMON_H | ||
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#include <linux/list.h> | ||
#include <linux/types.h> | ||
#include <scsi/scsi.h> | ||
#include <scsi/scsi_device.h> | ||
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#define MAX_CONTEXT CXLFLASH_MAX_CONTEXT /* num contexts per afu */ | ||
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#define CXLFLASH_BLOCK_SIZE 4096 /* 4K blocks */ | ||
#define CXLFLASH_MAX_XFER_SIZE 16777216 /* 16MB transfer */ | ||
#define CXLFLASH_MAX_SECTORS (CXLFLASH_MAX_XFER_SIZE/512) /* SCSI wants | ||
max_sectors | ||
in units of | ||
512 byte | ||
sectors | ||
*/ | ||
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#define NUM_RRQ_ENTRY 16 /* for master issued cmds */ | ||
#define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry)) | ||
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/* AFU command retry limit */ | ||
#define MC_RETRY_CNT 5 /* sufficient for SCSI check and | ||
certain AFU errors */ | ||
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/* Command management definitions */ | ||
#define CXLFLASH_NUM_CMDS (2 * CXLFLASH_MAX_CMDS) /* Must be a pow2 for | ||
alignment and more | ||
efficient array | ||
index derivation | ||
*/ | ||
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#define CXLFLASH_MAX_CMDS 16 | ||
#define CXLFLASH_MAX_CMDS_PER_LUN CXLFLASH_MAX_CMDS | ||
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static inline void check_sizes(void) | ||
{ | ||
BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_NUM_CMDS); | ||
} | ||
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/* AFU defines a fixed size of 4K for command buffers (borrow 4K page define) */ | ||
#define CMD_BUFSIZE SIZE_4K | ||
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/* flags in IOA status area for host use */ | ||
#define B_DONE 0x01 | ||
#define B_ERROR 0x02 /* set with B_DONE */ | ||
#define B_TIMEOUT 0x04 /* set with B_DONE & B_ERROR */ | ||
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enum cxlflash_lr_state { | ||
LINK_RESET_INVALID, | ||
LINK_RESET_REQUIRED, | ||
LINK_RESET_COMPLETE | ||
}; | ||
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enum cxlflash_init_state { | ||
INIT_STATE_NONE, | ||
INIT_STATE_PCI, | ||
INIT_STATE_AFU, | ||
INIT_STATE_SCSI | ||
}; | ||
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/* | ||
* Each context has its own set of resource handles that is visible | ||
* only from that context. | ||
*/ | ||
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struct cxlflash_cfg { | ||
struct afu *afu; | ||
struct cxl_context *mcctx; | ||
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struct pci_dev *dev; | ||
struct pci_device_id *dev_id; | ||
struct Scsi_Host *host; | ||
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ulong cxlflash_regs_pci; | ||
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wait_queue_head_t eeh_waitq; | ||
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struct work_struct work_q; | ||
enum cxlflash_init_state init_state; | ||
enum cxlflash_lr_state lr_state; | ||
int lr_port; | ||
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struct cxl_afu *cxl_afu; | ||
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struct pci_pool *cxlflash_cmd_pool; | ||
struct pci_dev *parent_dev; | ||
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wait_queue_head_t tmf_waitq; | ||
bool tmf_active; | ||
u8 err_recovery_active:1; | ||
}; | ||
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struct afu_cmd { | ||
struct sisl_ioarcb rcb; /* IOARCB (cache line aligned) */ | ||
struct sisl_ioasa sa; /* IOASA must follow IOARCB */ | ||
spinlock_t slock; | ||
struct completion cevent; | ||
char *buf; /* per command buffer */ | ||
struct afu *parent; | ||
int slot; | ||
atomic_t free; | ||
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u8 cmd_tmf:1; | ||
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/* As per the SISLITE spec the IOARCB EA has to be 16-byte aligned. | ||
* However for performance reasons the IOARCB/IOASA should be | ||
* cache line aligned. | ||
*/ | ||
} __aligned(cache_line_size()); | ||
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struct afu { | ||
/* Stuff requiring alignment go first. */ | ||
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u64 rrq_entry[NUM_RRQ_ENTRY]; /* 128B RRQ */ | ||
/* | ||
* Command & data for AFU commands. | ||
*/ | ||
struct afu_cmd cmd[CXLFLASH_NUM_CMDS]; | ||
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/* Beware of alignment till here. Preferably introduce new | ||
* fields after this point | ||
*/ | ||
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/* AFU HW */ | ||
struct cxl_ioctl_start_work work; | ||
struct cxlflash_afu_map *afu_map; /* entire MMIO map */ | ||
struct sisl_host_map *host_map; /* MC host map */ | ||
struct sisl_ctrl_map *ctrl_map; /* MC control map */ | ||
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ctx_hndl_t ctx_hndl; /* master's context handle */ | ||
u64 *hrrq_start; | ||
u64 *hrrq_end; | ||
u64 *hrrq_curr; | ||
bool toggle; | ||
bool read_room; | ||
atomic64_t room; | ||
u64 hb; | ||
u32 cmd_couts; /* Number of command checkouts */ | ||
u32 internal_lun; /* User-desired LUN mode for this AFU */ | ||
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char version[8]; | ||
u64 interface_version; | ||
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struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */ | ||
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}; | ||
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static inline u64 lun_to_lunid(u64 lun) | ||
{ | ||
u64 lun_id; | ||
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int_to_scsilun(lun, (struct scsi_lun *)&lun_id); | ||
return swab64(lun_id); | ||
} | ||
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int cxlflash_send_cmd(struct afu *, struct afu_cmd *); | ||
void cxlflash_wait_resp(struct afu *, struct afu_cmd *); | ||
int cxlflash_afu_reset(struct cxlflash_cfg *); | ||
struct afu_cmd *cxlflash_cmd_checkout(struct afu *); | ||
void cxlflash_cmd_checkin(struct afu_cmd *); | ||
int cxlflash_afu_sync(struct afu *, ctx_hndl_t, res_hndl_t, u8); | ||
#endif /* ifndef _CXLFLASH_COMMON_H */ |
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