Commit c21e0bbf authored by Matthew R. Ochs's avatar Matthew R. Ochs Committed by James Bottomley

cxlflash: Base support for IBM CXL Flash Adapter

SCSI device driver to support filesystem access on the IBM CXL Flash adapter.
Supported-by: default avatarStephen Bates <stephen.bates@pmcs.com>
Reviewed-by: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarMatthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: default avatarManoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Odin.com>
parent 2dc127bb
...@@ -345,6 +345,7 @@ source "drivers/scsi/cxgbi/Kconfig" ...@@ -345,6 +345,7 @@ source "drivers/scsi/cxgbi/Kconfig"
source "drivers/scsi/bnx2i/Kconfig" source "drivers/scsi/bnx2i/Kconfig"
source "drivers/scsi/bnx2fc/Kconfig" source "drivers/scsi/bnx2fc/Kconfig"
source "drivers/scsi/be2iscsi/Kconfig" source "drivers/scsi/be2iscsi/Kconfig"
source "drivers/scsi/cxlflash/Kconfig"
config SGIWD93_SCSI config SGIWD93_SCSI
tristate "SGI WD93C93 SCSI Driver" tristate "SGI WD93C93 SCSI Driver"
......
...@@ -102,6 +102,7 @@ obj-$(CONFIG_SCSI_7000FASST) += wd7000.o ...@@ -102,6 +102,7 @@ obj-$(CONFIG_SCSI_7000FASST) += wd7000.o
obj-$(CONFIG_SCSI_EATA) += eata.o obj-$(CONFIG_SCSI_EATA) += eata.o
obj-$(CONFIG_SCSI_DC395x) += dc395x.o obj-$(CONFIG_SCSI_DC395x) += dc395x.o
obj-$(CONFIG_SCSI_AM53C974) += esp_scsi.o am53c974.o obj-$(CONFIG_SCSI_AM53C974) += esp_scsi.o am53c974.o
obj-$(CONFIG_CXLFLASH) += cxlflash/
obj-$(CONFIG_MEGARAID_LEGACY) += megaraid.o obj-$(CONFIG_MEGARAID_LEGACY) += megaraid.o
obj-$(CONFIG_MEGARAID_NEWGEN) += megaraid/ obj-$(CONFIG_MEGARAID_NEWGEN) += megaraid/
obj-$(CONFIG_MEGARAID_SAS) += megaraid/ obj-$(CONFIG_MEGARAID_SAS) += megaraid/
......
#
# IBM CXL-attached Flash Accelerator SCSI Driver
#
config CXLFLASH
tristate "Support for IBM CAPI Flash"
depends on PCI && SCSI && CXL
default m
help
Allows CAPI Accelerated IO to Flash
If unsure, say N.
obj-$(CONFIG_CXLFLASH) += cxlflash.o
cxlflash-y += main.o
/*
* 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.
*/
#ifndef _CXLFLASH_COMMON_H
#define _CXLFLASH_COMMON_H
#include <linux/list.h>
#include <linux/types.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#define MAX_CONTEXT CXLFLASH_MAX_CONTEXT /* num contexts per afu */
#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
*/
#define NUM_RRQ_ENTRY 16 /* for master issued cmds */
#define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry))
/* AFU command retry limit */
#define MC_RETRY_CNT 5 /* sufficient for SCSI check and
certain AFU errors */
/* Command management definitions */
#define CXLFLASH_NUM_CMDS (2 * CXLFLASH_MAX_CMDS) /* Must be a pow2 for
alignment and more
efficient array
index derivation
*/
#define CXLFLASH_MAX_CMDS 16
#define CXLFLASH_MAX_CMDS_PER_LUN CXLFLASH_MAX_CMDS
static inline void check_sizes(void)
{
BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_NUM_CMDS);
}
/* AFU defines a fixed size of 4K for command buffers (borrow 4K page define) */
#define CMD_BUFSIZE SIZE_4K
/* 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 */
enum cxlflash_lr_state {
LINK_RESET_INVALID,
LINK_RESET_REQUIRED,
LINK_RESET_COMPLETE
};
enum cxlflash_init_state {
INIT_STATE_NONE,
INIT_STATE_PCI,
INIT_STATE_AFU,
INIT_STATE_SCSI
};
/*
* Each context has its own set of resource handles that is visible
* only from that context.
*/
struct cxlflash_cfg {
struct afu *afu;
struct cxl_context *mcctx;
struct pci_dev *dev;
struct pci_device_id *dev_id;
struct Scsi_Host *host;
ulong cxlflash_regs_pci;
wait_queue_head_t eeh_waitq;
struct work_struct work_q;
enum cxlflash_init_state init_state;
enum cxlflash_lr_state lr_state;
int lr_port;
struct cxl_afu *cxl_afu;
struct pci_pool *cxlflash_cmd_pool;
struct pci_dev *parent_dev;
wait_queue_head_t tmf_waitq;
bool tmf_active;
u8 err_recovery_active:1;
};
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;
u8 cmd_tmf:1;
/* 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());
struct afu {
/* Stuff requiring alignment go first. */
u64 rrq_entry[NUM_RRQ_ENTRY]; /* 128B RRQ */
/*
* Command & data for AFU commands.
*/
struct afu_cmd cmd[CXLFLASH_NUM_CMDS];
/* Beware of alignment till here. Preferably introduce new
* fields after this point
*/
/* 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 */
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 */
char version[8];
u64 interface_version;
struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */
};
static inline u64 lun_to_lunid(u64 lun)
{
u64 lun_id;
int_to_scsilun(lun, (struct scsi_lun *)&lun_id);
return swab64(lun_id);
}
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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/*
* 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.
*/
#ifndef _CXLFLASH_MAIN_H
#define _CXLFLASH_MAIN_H
#include <linux/list.h>
#include <linux/types.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#define CXLFLASH_NAME "cxlflash"
#define CXLFLASH_ADAPTER_NAME "IBM POWER CXL Flash Adapter"
#define CXLFLASH_DRIVER_DATE "(June 2, 2015)"
#define PCI_DEVICE_ID_IBM_CORSA 0x04F0
#define CXLFLASH_SUBS_DEV_ID 0x04F0
/* Since there is only one target, make it 0 */
#define CXLFLASH_TARGET 0
#define CXLFLASH_MAX_CDB_LEN 16
/* Really only one target per bus since the Texan is directly attached */
#define CXLFLASH_MAX_NUM_TARGETS_PER_BUS 1
#define CXLFLASH_MAX_NUM_LUNS_PER_TARGET 65536
#define CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT (120 * HZ)
#define NUM_FC_PORTS CXLFLASH_NUM_FC_PORTS /* ports per AFU */
/* FC defines */
#define FC_MTIP_CMDCONFIG 0x010
#define FC_MTIP_STATUS 0x018
#define FC_PNAME 0x300
#define FC_CONFIG 0x320
#define FC_CONFIG2 0x328
#define FC_STATUS 0x330
#define FC_ERROR 0x380
#define FC_ERRCAP 0x388
#define FC_ERRMSK 0x390
#define FC_CNT_CRCERR 0x538
#define FC_CRC_THRESH 0x580
#define FC_MTIP_CMDCONFIG_ONLINE 0x20ULL
#define FC_MTIP_CMDCONFIG_OFFLINE 0x40ULL
#define FC_MTIP_STATUS_MASK 0x30ULL
#define FC_MTIP_STATUS_ONLINE 0x20ULL
#define FC_MTIP_STATUS_OFFLINE 0x10ULL
/* TIMEOUT and RETRY definitions */
/* AFU command timeout values */
#define MC_AFU_SYNC_TIMEOUT 5 /* 5 secs */
/* AFU command room retry limit */
#define MC_ROOM_RETRY_CNT 10
/* FC CRC clear periodic timer */
#define MC_CRC_THRESH 100 /* threshold in 5 mins */
#define FC_PORT_STATUS_RETRY_CNT 100 /* 100 100ms retries = 10 seconds */
#define FC_PORT_STATUS_RETRY_INTERVAL_US 100000 /* microseconds */
/* VPD defines */
#define CXLFLASH_VPD_LEN 256
#define WWPN_LEN 16
#define WWPN_BUF_LEN (WWPN_LEN + 1)
enum undo_level {
RELEASE_CONTEXT = 0,
FREE_IRQ,
UNMAP_ONE,
UNMAP_TWO,
UNMAP_THREE,
UNDO_START
};
struct dev_dependent_vals {
u64 max_sectors;
};
struct asyc_intr_info {
u64 status;
char *desc;
u8 port;
u8 action;
#define CLR_FC_ERROR 0x01
#define LINK_RESET 0x02
};
#endif /* _CXLFLASH_MAIN_H */
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