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raid-unlock-tool
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The tool is incomplete as of now, and does not compile yet.
We need the right scsi command contents. A lot of the code was copied
from smartmontools. Only megaraid support is currently present.
master
itycodes 4 months ago
commit c3cea8f4a9
1 changed files with 207 additions and 0 deletions
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main.c
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#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <bits/types/struct_iovec.h>
#define MAX_IOCTL_SGE 16
#define MEGASAS_MAGIC 'M'
#define MEGASAS_IOC_FIRMWARE _IOWR(MEGASAS_MAGIC, 1, struct megasas_iocpacket)
#define MFI_FRAME_DIR_NONE 0x0000
#define MFI_FRAME_DIR_WRITE 0x0008
#define MFI_FRAME_DIR_READ 0x0010
#define MFI_FRAME_DIR_BOTH 0x0018
#define MFI_CMD_PD_SCSI_IO 0x04
#define SAT_ATA_PASSTHROUGH_12 0xa1
#define SAT_ATA_PASSTHROUGH_16 0x85
#define ATA_SMART_CMD 0xb0
#define ATA_SMART_WRITE_LOG_SECTOR 0xd6
struct megasas_sge32 {
uint32_t phys_addr;
uint32_t length;
} __attribute__ ((packed));
union megasas_sgl {
struct megasas_sge32 sge32[1];
} __attribute__ ((packed));
struct megasas_pthru_frame {
uint8_t cmd; /*00h */
uint8_t sense_len; /*01h */
uint8_t cmd_status; /*02h */
uint8_t scsi_status; /*03h */
uint8_t target_id; /*04h */
uint8_t lun; /*05h */
uint8_t cdb_len; /*06h */
uint8_t sge_count; /*07h */
uint32_t context; /*08h */
uint32_t pad_0; /*0Ch */
uint16_t flags; /*10h */
uint16_t timeout; /*12h */
uint32_t data_xfer_len; /*14h */
uint32_t sense_buf_phys_addr_lo; /*18h */
uint32_t sense_buf_phys_addr_hi; /*1Ch */
uint8_t cdb[16]; /*20h */
union megasas_sgl sgl; /*30h */
} __attribute__ ((packed));
struct megasas_iocpacket {
uint16_t host_no;
uint16_t __pad1;
uint32_t sgl_off;
uint32_t sge_count;
uint32_t sense_off;
uint32_t sense_len;
union {
uint8_t raw[128];
struct megasas_pthru_frame pthru;
} frame;
struct iovec sgl[MAX_IOCTL_SGE];
} __attribute__ ((packed));
#define DXFER_NONE 0
#define DXFER_FROM_DEVICE 1
#define DXFER_TO_DEVICE 2
/* scsi_rsoc_elem and scsi_device is defined in dev_interface.h */
struct scsi_cmnd_io
{
uint8_t * cmnd; /* [in]: ptr to SCSI command block (cdb) */
size_t cmnd_len; /* [in]: number of bytes in SCSI command */
int dxfer_dir; /* [in]: DXFER_NONE, DXFER_FROM_DEVICE, or
DXFER_TO_DEVICE */
uint8_t * dxferp; /* [in]: ptr to outgoing or incoming data buffer */
size_t dxfer_len; /* [in]: bytes to be transferred to/from dxferp */
uint8_t * sensep; /* [in]: ptr to sense buffer, filled when
CHECK CONDITION status occurs */
size_t max_sense_len; /* [in]: max number of bytes to write to sensep */
unsigned timeout; /* [in]: seconds, 0-> default timeout (60 seconds?) */
size_t resp_sense_len; /* [out]: sense buffer length written */
uint8_t scsi_status; /* [out]: 0->ok, 2->CHECK CONDITION, etc ... */
int resid; /* [out]: Number of bytes requested to be transferred
less actual number transferred (0 if not
supported) */
};
bool prepare_dev(char* dev_name, uint32_t* out_m_hba) {
// dev_name should be in /dev/bus/%u
if (sscanf(dev_name, "/dev/bus/%u", out_m_hba) == 0) {
fprintf(stderr, "prepare_dev: bad dev_name\n");
return false;
}
return true;
}
bool megasas_cmd(unsigned int m_hba, int m_fd, unsigned int m_disknum,
int cdbLen, void* cdb, int dataLen, void* data,
int /*senseLen*/, void * /*sense*/, int /*report*/,
int dxfer_dir) {
struct megasas_pthru_frame *pthru;
struct megasas_iocpacket uio;
memset(&uio, 0, sizeof(uio));
pthru = &uio.frame.pthru;
pthru->cmd = MFI_CMD_PD_SCSI_IO;
pthru->cmd_status = 0xFF;
pthru->scsi_status = 0x0;
pthru->target_id = m_disknum;
pthru->lun = 0;
pthru->cdb_len = cdbLen;
pthru->timeout = 0;
switch (dxfer_dir) {
case DXFER_NONE:
pthru->flags = MFI_FRAME_DIR_NONE;
break;
case DXFER_FROM_DEVICE:
pthru->flags = MFI_FRAME_DIR_READ;
break;
case DXFER_TO_DEVICE:
pthru->flags = MFI_FRAME_DIR_WRITE;
break;
default:
fprintf(stderr, "megasas_cmd: bad dxfer_dir\n");
return false;
}
if (dataLen > 0) {
pthru->sge_count = 1;
pthru->data_xfer_len = dataLen;
pthru->sgl.sge32[0].phys_addr = (intptr_t)data;
pthru->sgl.sge32[0].length = (uint32_t)dataLen;
}
memcpy(pthru->cdb, cdb, cdbLen);
uio.host_no = m_hba;
if (dataLen > 0) {
printf("1322 branch taken\n");
uio.sge_count = 1;
uio.sgl_off = offsetof(struct megasas_pthru_frame, sgl);
uio.sgl[0].iov_base = data;
uio.sgl[0].iov_len = dataLen;
}
errno = 0;
int rc = ioctl(m_fd, MEGASAS_IOC_FIRMWARE, &uio);
}
bool scsi_pass_through(unsigned int m_hba, int m_fd, unsigned int m_disknum, struct scsi_cmnd_io *iop)
{
// Controller rejects Test Unit Ready
if (iop->cmnd[0] == 0x00)
return true;
if (iop->cmnd[0] == SAT_ATA_PASSTHROUGH_12 || iop->cmnd[0] == SAT_ATA_PASSTHROUGH_16) {
// Controller does not return ATA output registers in SAT sense data
if (iop->cmnd[2] & (1 << 5)) { // chk_cond
fprintf(stderr, "scsi_pass_through: ATA return descriptor not supported by controller firmware\n");
return false;
}
}
// SMART WRITE LOG SECTOR causing media errors
if ((iop->cmnd[0] == SAT_ATA_PASSTHROUGH_16 // SAT16 WRITE LOG
&& iop->cmnd[14] == ATA_SMART_CMD && iop->cmnd[3]==0 && iop->cmnd[4] == ATA_SMART_WRITE_LOG_SECTOR) ||
(iop->cmnd[0] == SAT_ATA_PASSTHROUGH_12 // SAT12 WRITE LOG
&& iop->cmnd[9] == ATA_SMART_CMD && iop->cmnd[3] == ATA_SMART_WRITE_LOG_SECTOR))
{
fprintf(stderr, "<UNIMPLEMENTED>: SMART WRITE LOG SECTOR may cause problems\n");
return false;
}
return megasas_cmd(m_hba, m_fd, m_disknum, iop->cmnd_len, iop->cmnd,
iop->dxfer_len, iop->dxferp,
iop->max_sense_len, iop->sensep, 0, iop->dxfer_dir);
}
int main(int argc, char* argv[]) {
int m_fd = open("/dev/megaraid_sas_ioctl_node", O_RDWR);
char* dev_name = "/dev/bus/0";
uint32_t m_hba = 0;
prepare_dev(dev_name, &m_hba);
uint32_t m_disknum = 0; // megaraid,0
struct scsi_cmnd_io iop = {
// TODO fill this up
};
scsi_pass_through(m_hba, m_fd, m_disknum, &iop);
}
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