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