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/*
* Copyright (c) 2020 The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define LOG_TAG "recovery_ufs"
#include "recovery-ufs-bsg.h"
#ifndef _BSG_FRAMEWORK_KERNEL_HEADERS
#ifndef _GENERIC_KERNEL_HEADERS
#include <scsi/ufs/ioctl.h>
#include <scsi/ufs/ufs.h>
#endif
#endif
//Size of the buffer that needs to be passed to the UFS ioctl
#define UFS_ATTR_DATA_SIZE 32
#ifdef _BSG_FRAMEWORK_KERNEL_HEADERS
static int get_ufs_bsg_dev(void)
{
DIR *dir;
struct dirent *ent;
int ret = -ENODEV;
if ((dir = opendir ("/dev")) != NULL) {
/* read all the files and directories within directory */
while ((ent = readdir(dir)) != NULL) {
if (!strcmp(ent->d_name, "ufs-bsg") ||
!strcmp(ent->d_name, "ufs-bsg0")) {
snprintf(ufs_bsg_dev, FNAME_SZ, "/dev/%s", ent->d_name);
ret = 0;
break;
}
}
if (ret)
ALOGE("could not find the ufs-bsg dev\n");
closedir (dir);
} else {
/* could not open directory */
ALOGE("could not open /dev (error no: %d)\n", errno);
ret = -EINVAL;
}
return ret;
}
int ufs_bsg_dev_open(void)
{
int ret;
if (!fd_ufs_bsg) {
fd_ufs_bsg = open(ufs_bsg_dev, O_RDWR);
ret = errno;
if (fd_ufs_bsg < 0) {
ALOGE("Unable to open %s (error no: %d)",
ufs_bsg_dev, errno);
fd_ufs_bsg = 0;
return ret;
}
}
return 0;
}
void ufs_bsg_dev_close(void)
{
if (fd_ufs_bsg) {
close(fd_ufs_bsg);
fd_ufs_bsg = 0;
}
}
static int ufs_bsg_ioctl(int fd, struct ufs_bsg_request *req,
struct ufs_bsg_reply *rsp, __u8 *buf, __u32 buf_len,
enum bsg_ioctl_dir dir)
{
int ret;
struct sg_io_v4 sg_io{};
sg_io.guard = 'Q';
sg_io.protocol = BSG_PROTOCOL_SCSI;
sg_io.subprotocol = BSG_SUB_PROTOCOL_SCSI_TRANSPORT;
sg_io.request_len = sizeof(*req);
sg_io.request = (__u64)req;
sg_io.response = (__u64)rsp;
sg_io.max_response_len = sizeof(*rsp);
if (dir == BSG_IOCTL_DIR_FROM_DEV) {
sg_io.din_xfer_len = buf_len;
sg_io.din_xferp = (__u64)(buf);
} else {
sg_io.dout_xfer_len = buf_len;
sg_io.dout_xferp = (__u64)(buf);
}
ret = ioctl(fd, SG_IO, &sg_io);
if (ret)
ALOGE("%s: Error from sg_io ioctl (return value: %d, error no: %d, reply result from LLD: %d\n)",
__func__, ret, errno, rsp->result);
if (sg_io.info || rsp->result) {
ALOGE("%s: Error from sg_io info (check sg info: device_status: 0x%x, transport_status: 0x%x, driver_status: 0x%x, reply result from LLD: %d\n)",
__func__, sg_io.device_status, sg_io.transport_status,
sg_io.driver_status, rsp->result);
ret = -EAGAIN;
}
return ret;
}
static void compose_ufs_bsg_query_req(struct ufs_bsg_request *req, __u8 func,
__u8 opcode, __u8 idn, __u8 index, __u8 sel,
__u16 length)
{
struct utp_upiu_header *hdr = &req->upiu_req.header;
struct utp_upiu_query *qr = &req->upiu_req.qr;
req->msgcode = UTP_UPIU_QUERY_REQ;
hdr->dword_0 = DWORD(UTP_UPIU_QUERY_REQ, 0, 0, 0);
hdr->dword_1 = DWORD(0, func, 0, 0);
hdr->dword_2 = DWORD(0, 0, length >> 8, (__u8)length);
qr->opcode = opcode;
qr->idn = idn;
qr->index = index;
qr->selector = sel;
qr->length = htobe16(length);
}
static int ufs_query_attr(int fd, __u32 value,
__u8 func, __u8 opcode, __u8 idn,
__u8 index, __u8 sel)
{
struct ufs_bsg_request req{};
struct ufs_bsg_reply rsp{};
enum bsg_ioctl_dir dir = BSG_IOCTL_DIR_FROM_DEV;
int ret = 0;
if (opcode == QUERY_REQ_OP_WRITE_DESC || opcode == QUERY_REQ_OP_WRITE_ATTR)
dir = BSG_IOCTL_DIR_TO_DEV;
req.upiu_req.qr.value = htobe32(value);
compose_ufs_bsg_query_req(&req, func, opcode, idn, index, sel, 0);
ret = ufs_bsg_ioctl(fd, &req, &rsp, 0, 0, dir);
if (ret)
ALOGE("%s: Error from ufs_bsg_ioctl (return value: %d, error no: %d\n)",
__func__, ret, errno);
return ret;
}
int32_t set_boot_lun(char *sg_dev __unused,uint8_t lun_id)
{
int32_t ret;
__u32 boot_lun_id = lun_id;
ret = get_ufs_bsg_dev();
if (ret)
return ret;
ALOGV("Found the ufs bsg dev: %s\n", ufs_bsg_dev);
ret = ufs_bsg_dev_open();
if (ret)
return ret;
ALOGV("Opened ufs bsg dev: %s\n", ufs_bsg_dev);
ret = ufs_query_attr(fd_ufs_bsg, boot_lun_id, QUERY_REQ_FUNC_STD_WRITE,
QUERY_REQ_OP_WRITE_ATTR, QUERY_ATTR_IDN_BOOT_LU_EN, 0, 0);
if (ret) {
ALOGE("Error requesting ufs attr idn %d via query ioctl (return value: %d, error no: %d)",
QUERY_ATTR_IDN_BOOT_LU_EN, ret, errno);
goto out;
}
out:
ufs_bsg_dev_close();
return ret;
}
#endif
#ifndef _BSG_FRAMEWORK_KERNEL_HEADERS
int32_t set_boot_lun(char *sg_dev, uint8_t boot_lun_id)
{
#ifndef _GENERIC_KERNEL_HEADERS
int fd = -1;
int rc;
struct ufs_ioctl_query_data *data = NULL;
size_t ioctl_data_size = sizeof(struct ufs_ioctl_query_data) + UFS_ATTR_DATA_SIZE;
data = (struct ufs_ioctl_query_data*)malloc(ioctl_data_size);
if (!data) {
fprintf(stderr, "%s: Failed to alloc query data struct\n",
__func__);
goto error;
}
memset(data, 0, ioctl_data_size);
data->opcode = UPIU_QUERY_OPCODE_WRITE_ATTR;
data->idn = QUERY_ATTR_IDN_BOOT_LU_EN;
data->buf_size = UFS_ATTR_DATA_SIZE;
data->buffer[0] = boot_lun_id;
fd = open(sg_dev, O_RDWR);
if (fd < 0) {
fprintf(stderr, "%s: Failed to open %s(%s)\n",
__func__,
sg_dev,
strerror(errno));
goto error;
}
rc = ioctl(fd, UFS_IOCTL_QUERY, data);
if (rc) {
fprintf(stderr, "%s: UFS query ioctl failed(%s)\n",
__func__,
strerror(errno));
goto error;
}
close(fd);
free(data);
return 0;
error:
if (fd >= 0)
close(fd);
if (data)
free(data);
return -1;
#else
return 0;
#endif
}
#endif
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