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linux/drivers/scsi/mvsas/mv_sas.h
Gustavo A. R. Silva 5febf6d6ae scsi: Replace zero-length array with flexible-array member 
The current codebase makes use of the zero-length array language extension
to the C90 standard, but the preferred mechanism to declare variable-length
types such as these ones is a flexible array member[1][2], introduced in
C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning in
case the flexible array does not occur last in the structure, which will
help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by this
change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Link: https://lore.kernel.org/r/20200224161406.GA21454@embeddedor
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-03-11 23:07:56 -04:00

466 lines
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Marvell 88SE64xx/88SE94xx main function head file
*
* Copyright 2007 Red Hat, Inc.
* Copyright 2008 Marvell. <kewei@marvell.com>
* Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
*/
#ifndef _MV_SAS_H_
#define _MV_SAS_H_
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <asm/unaligned.h>
#include <scsi/libsas.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.h>
#include <scsi/sas_ata.h>
#include "mv_defs.h"
#define DRV_NAME "mvsas"
#define DRV_VERSION "0.8.16"
#define MVS_ID_NOT_MAPPED 0x7f
#define WIDE_PORT_MAX_PHY 4
#define mv_printk(fmt, arg ...) \
printk(KERN_DEBUG"%s %d:" fmt, __FILE__, __LINE__, ## arg)
#ifdef MV_DEBUG
#define mv_dprintk(format, arg...) \
printk(KERN_DEBUG"%s %d:" format, __FILE__, __LINE__, ## arg)
#else
#define mv_dprintk(format, arg...)
#endif
#define MV_MAX_U32 0xffffffff
extern int interrupt_coalescing;
extern struct mvs_tgt_initiator mvs_tgt;
extern struct mvs_info *tgt_mvi;
extern const struct mvs_dispatch mvs_64xx_dispatch;
extern const struct mvs_dispatch mvs_94xx_dispatch;
#define bit(n) ((u64)1 << n)
#define for_each_phy(__lseq_mask, __mc, __lseq) \
for ((__mc) = (__lseq_mask), (__lseq) = 0; \
(__mc) != 0 ; \
(++__lseq), (__mc) >>= 1)
#define MVS_PHY_ID (1U << sas_phy->id)
#define MV_INIT_DELAYED_WORK(w, f, d) INIT_DELAYED_WORK(w, f)
#define UNASSOC_D2H_FIS(id) \
((void *) mvi->rx_fis + 0x100 * id)
#define SATA_RECEIVED_FIS_LIST(reg_set) \
((void *) mvi->rx_fis + mvi->chip->fis_offs + 0x100 * reg_set)
#define SATA_RECEIVED_SDB_FIS(reg_set) \
(SATA_RECEIVED_FIS_LIST(reg_set) + 0x58)
#define SATA_RECEIVED_D2H_FIS(reg_set) \
(SATA_RECEIVED_FIS_LIST(reg_set) + 0x40)
#define SATA_RECEIVED_PIO_FIS(reg_set) \
(SATA_RECEIVED_FIS_LIST(reg_set) + 0x20)
#define SATA_RECEIVED_DMA_FIS(reg_set) \
(SATA_RECEIVED_FIS_LIST(reg_set) + 0x00)
enum dev_status {
MVS_DEV_NORMAL = 0x0,
MVS_DEV_EH = 0x1,
};
enum dev_reset {
MVS_SOFT_RESET = 0,
MVS_HARD_RESET = 1,
MVS_PHY_TUNE = 2,
};
struct mvs_info;
struct mvs_prv_info;
struct mvs_dispatch {
char *name;
int (*chip_init)(struct mvs_info *mvi);
int (*spi_init)(struct mvs_info *mvi);
int (*chip_ioremap)(struct mvs_info *mvi);
void (*chip_iounmap)(struct mvs_info *mvi);
irqreturn_t (*isr)(struct mvs_info *mvi, int irq, u32 stat);
u32 (*isr_status)(struct mvs_info *mvi, int irq);
void (*interrupt_enable)(struct mvs_info *mvi);
void (*interrupt_disable)(struct mvs_info *mvi);
u32 (*read_phy_ctl)(struct mvs_info *mvi, u32 port);
void (*write_phy_ctl)(struct mvs_info *mvi, u32 port, u32 val);
u32 (*read_port_cfg_data)(struct mvs_info *mvi, u32 port);
void (*write_port_cfg_data)(struct mvs_info *mvi, u32 port, u32 val);
void (*write_port_cfg_addr)(struct mvs_info *mvi, u32 port, u32 addr);
u32 (*read_port_vsr_data)(struct mvs_info *mvi, u32 port);
void (*write_port_vsr_data)(struct mvs_info *mvi, u32 port, u32 val);
void (*write_port_vsr_addr)(struct mvs_info *mvi, u32 port, u32 addr);
u32 (*read_port_irq_stat)(struct mvs_info *mvi, u32 port);
void (*write_port_irq_stat)(struct mvs_info *mvi, u32 port, u32 val);
u32 (*read_port_irq_mask)(struct mvs_info *mvi, u32 port);
void (*write_port_irq_mask)(struct mvs_info *mvi, u32 port, u32 val);
void (*command_active)(struct mvs_info *mvi, u32 slot_idx);
void (*clear_srs_irq)(struct mvs_info *mvi, u8 reg_set, u8 clear_all);
void (*issue_stop)(struct mvs_info *mvi, enum mvs_port_type type,
u32 tfs);
void (*start_delivery)(struct mvs_info *mvi, u32 tx);
u32 (*rx_update)(struct mvs_info *mvi);
void (*int_full)(struct mvs_info *mvi);
u8 (*assign_reg_set)(struct mvs_info *mvi, u8 *tfs);
void (*free_reg_set)(struct mvs_info *mvi, u8 *tfs);
u32 (*prd_size)(void);
u32 (*prd_count)(void);
void (*make_prd)(struct scatterlist *scatter, int nr, void *prd);
void (*detect_porttype)(struct mvs_info *mvi, int i);
int (*oob_done)(struct mvs_info *mvi, int i);
void (*fix_phy_info)(struct mvs_info *mvi, int i,
struct sas_identify_frame *id);
void (*phy_work_around)(struct mvs_info *mvi, int i);
void (*phy_set_link_rate)(struct mvs_info *mvi, u32 phy_id,
struct sas_phy_linkrates *rates);
u32 (*phy_max_link_rate)(void);
void (*phy_disable)(struct mvs_info *mvi, u32 phy_id);
void (*phy_enable)(struct mvs_info *mvi, u32 phy_id);
void (*phy_reset)(struct mvs_info *mvi, u32 phy_id, int hard);
void (*stp_reset)(struct mvs_info *mvi, u32 phy_id);
void (*clear_active_cmds)(struct mvs_info *mvi);
u32 (*spi_read_data)(struct mvs_info *mvi);
void (*spi_write_data)(struct mvs_info *mvi, u32 data);
int (*spi_buildcmd)(struct mvs_info *mvi,
u32 *dwCmd,
u8 cmd,
u8 read,
u8 length,
u32 addr
);
int (*spi_issuecmd)(struct mvs_info *mvi, u32 cmd);
int (*spi_waitdataready)(struct mvs_info *mvi, u32 timeout);
void (*dma_fix)(struct mvs_info *mvi, u32 phy_mask,
int buf_len, int from, void *prd);
void (*tune_interrupt)(struct mvs_info *mvi, u32 time);
void (*non_spec_ncq_error)(struct mvs_info *mvi);
int (*gpio_write)(struct mvs_prv_info *mvs_prv, u8 reg_type,
u8 reg_index, u8 reg_count, u8 *write_data);
};
struct mvs_chip_info {
u32 n_host;
u32 n_phy;
u32 fis_offs;
u32 fis_count;
u32 srs_sz;
u32 sg_width;
u32 slot_width;
const struct mvs_dispatch *dispatch;
};
#define MVS_MAX_SG (1U << mvi->chip->sg_width)
#define MVS_CHIP_SLOT_SZ (1U << mvi->chip->slot_width)
#define MVS_RX_FISL_SZ \
(mvi->chip->fis_offs + (mvi->chip->fis_count * 0x100))
#define MVS_CHIP_DISP (mvi->chip->dispatch)
struct mvs_err_info {
__le32 flags;
__le32 flags2;
};
struct mvs_cmd_hdr {
__le32 flags; /* PRD tbl len; SAS, SATA ctl */
__le32 lens; /* cmd, max resp frame len */
__le32 tags; /* targ port xfer tag; tag */
__le32 data_len; /* data xfer len */
__le64 cmd_tbl; /* command table address */
__le64 open_frame; /* open addr frame address */
__le64 status_buf; /* status buffer address */
__le64 prd_tbl; /* PRD tbl address */
__le32 reserved[4];
};
struct mvs_port {
struct asd_sas_port sas_port;
u8 port_attached;
u8 wide_port_phymap;
struct list_head list;
};
struct mvs_phy {
struct mvs_info *mvi;
struct mvs_port *port;
struct asd_sas_phy sas_phy;
struct sas_identify identify;
struct scsi_device *sdev;
struct timer_list timer;
u64 dev_sas_addr;
u64 att_dev_sas_addr;
u32 att_dev_info;
u32 dev_info;
u32 phy_type;
u32 phy_status;
u32 irq_status;
u32 frame_rcvd_size;
u8 frame_rcvd[32];
u8 phy_attached;
u8 phy_mode;
u8 reserved[2];
u32 phy_event;
enum sas_linkrate minimum_linkrate;
enum sas_linkrate maximum_linkrate;
};
struct mvs_device {
struct list_head dev_entry;
enum sas_device_type dev_type;
struct mvs_info *mvi_info;
struct domain_device *sas_device;
u32 attached_phy;
u32 device_id;
u32 running_req;
u8 taskfileset;
u8 dev_status;
u16 reserved;
};
/* Generate PHY tunning parameters */
struct phy_tuning {
/* 1 bit, transmitter emphasis enable */
u8 trans_emp_en:1;
/* 4 bits, transmitter emphasis amplitude */
u8 trans_emp_amp:4;
/* 3 bits, reserved space */
u8 Reserved_2bit_1:3;
/* 5 bits, transmitter amplitude */
u8 trans_amp:5;
/* 2 bits, transmitter amplitude adjust */
u8 trans_amp_adj:2;
/* 1 bit, reserved space */
u8 resv_2bit_2:1;
/* 2 bytes, reserved space */
u8 reserved[2];
};
struct ffe_control {
/* 4 bits, FFE Capacitor Select (value range 0~F) */
u8 ffe_cap_sel:4;
/* 3 bits, FFE Resistor Select (value range 0~7) */
u8 ffe_rss_sel:3;
/* 1 bit reserve*/
u8 reserved:1;
};
/*
* HBA_Info_Page is saved in Flash/NVRAM, total 256 bytes.
* The data area is valid only Signature="MRVL".
* If any member fills with 0xFF, the member is invalid.
*/
struct hba_info_page {
/* Dword 0 */
/* 4 bytes, structure signature,should be "MRVL" at first initial */
u8 signature[4];
/* Dword 1-13 */
u32 reserved1[13];
/* Dword 14-29 */
/* 64 bytes, SAS address for each port */
u64 sas_addr[8];
/* Dword 30-31 */
/* 8 bytes for vanir 8 port PHY FFE seeting
* BIT 0~3 : FFE Capacitor select(value range 0~F)
* BIT 4~6 : FFE Resistor select(value range 0~7)
* BIT 7: reserve.
*/
struct ffe_control ffe_ctl[8];
/* Dword 32 -43 */
u32 reserved2[12];
/* Dword 44-45 */
/* 8 bytes, 0: 1.5G, 1: 3.0G, should be 0x01 at first initial */
u8 phy_rate[8];
/* Dword 46-53 */
/* 32 bytes, PHY tuning parameters for each PHY*/
struct phy_tuning phy_tuning[8];
/* Dword 54-63 */
u32 reserved3[10];
}; /* total 256 bytes */
struct mvs_slot_info {
struct list_head entry;
union {
struct sas_task *task;
void *tdata;
};
u32 n_elem;
u32 tx;
u32 slot_tag;
/* DMA buffer for storing cmd tbl, open addr frame, status buffer,
* and PRD table
*/
void *buf;
dma_addr_t buf_dma;
void *response;
struct mvs_port *port;
struct mvs_device *device;
void *open_frame;
};
struct mvs_info {
unsigned long flags;
/* host-wide lock */
spinlock_t lock;
/* our device */
struct pci_dev *pdev;
struct device *dev;
/* enhanced mode registers */
void __iomem *regs;
/* peripheral or soc registers */
void __iomem *regs_ex;
u8 sas_addr[SAS_ADDR_SIZE];
/* SCSI/SAS glue */
struct sas_ha_struct *sas;
struct Scsi_Host *shost;
/* TX (delivery) DMA ring */
__le32 *tx;
dma_addr_t tx_dma;
/* cached next-producer idx */
u32 tx_prod;
/* RX (completion) DMA ring */
__le32 *rx;
dma_addr_t rx_dma;
/* RX consumer idx */
u32 rx_cons;
/* RX'd FIS area */
__le32 *rx_fis;
dma_addr_t rx_fis_dma;
/* DMA command header slots */
struct mvs_cmd_hdr *slot;
dma_addr_t slot_dma;
u32 chip_id;
const struct mvs_chip_info *chip;
int tags_num;
unsigned long *tags;
/* further per-slot information */
struct mvs_phy phy[MVS_MAX_PHYS];
struct mvs_port port[MVS_MAX_PHYS];
u32 id;
u64 sata_reg_set;
struct list_head *hba_list;
struct list_head soc_entry;
struct list_head wq_list;
unsigned long instance;
u16 flashid;
u32 flashsize;
u32 flashsectSize;
void *addon;
struct hba_info_page hba_info_param;
struct mvs_device devices[MVS_MAX_DEVICES];
void *bulk_buffer;
dma_addr_t bulk_buffer_dma;
void *bulk_buffer1;
dma_addr_t bulk_buffer_dma1;
#define TRASH_BUCKET_SIZE 0x20000
void *dma_pool;
struct mvs_slot_info slot_info[];
};
struct mvs_prv_info{
u8 n_host;
u8 n_phy;
u8 scan_finished;
u8 reserve;
struct mvs_info *mvi[2];
struct tasklet_struct mv_tasklet;
};
struct mvs_wq {
struct delayed_work work_q;
struct mvs_info *mvi;
void *data;
int handler;
struct list_head entry;
};
struct mvs_task_exec_info {
struct sas_task *task;
struct mvs_cmd_hdr *hdr;
struct mvs_port *port;
u32 tag;
int n_elem;
};
/******************** function prototype *********************/
void mvs_get_sas_addr(void *buf, u32 buflen);
void mvs_tag_clear(struct mvs_info *mvi, u32 tag);
void mvs_tag_free(struct mvs_info *mvi, u32 tag);
void mvs_tag_set(struct mvs_info *mvi, unsigned int tag);
int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out);
void mvs_tag_init(struct mvs_info *mvi);
void mvs_iounmap(void __iomem *regs);
int mvs_ioremap(struct mvs_info *mvi, int bar, int bar_ex);
void mvs_phys_reset(struct mvs_info *mvi, u32 phy_mask, int hard);
int mvs_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
void *funcdata);
void mvs_set_sas_addr(struct mvs_info *mvi, int port_id, u32 off_lo,
u32 off_hi, u64 sas_addr);
void mvs_scan_start(struct Scsi_Host *shost);
int mvs_scan_finished(struct Scsi_Host *shost, unsigned long time);
int mvs_queue_command(struct sas_task *task, gfp_t gfp_flags);
int mvs_abort_task(struct sas_task *task);
int mvs_abort_task_set(struct domain_device *dev, u8 *lun);
int mvs_clear_aca(struct domain_device *dev, u8 *lun);
int mvs_clear_task_set(struct domain_device *dev, u8 * lun);
void mvs_port_formed(struct asd_sas_phy *sas_phy);
void mvs_port_deformed(struct asd_sas_phy *sas_phy);
int mvs_dev_found(struct domain_device *dev);
void mvs_dev_gone(struct domain_device *dev);
int mvs_lu_reset(struct domain_device *dev, u8 *lun);
int mvs_slot_complete(struct mvs_info *mvi, u32 rx_desc, u32 flags);
int mvs_I_T_nexus_reset(struct domain_device *dev);
int mvs_query_task(struct sas_task *task);
void mvs_release_task(struct mvs_info *mvi,
struct domain_device *dev);
void mvs_do_release_task(struct mvs_info *mvi, int phy_no,
struct domain_device *dev);
void mvs_int_port(struct mvs_info *mvi, int phy_no, u32 events);
void mvs_update_phyinfo(struct mvs_info *mvi, int i, int get_st);
int mvs_int_rx(struct mvs_info *mvi, bool self_clear);
struct mvs_device *mvs_find_dev_by_reg_set(struct mvs_info *mvi, u8 reg_set);
int mvs_gpio_write(struct sas_ha_struct *, u8 reg_type, u8 reg_index,
u8 reg_count, u8 *write_data);
#endif
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