^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * HMC Drive FTP Services
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2013
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Ralf Hoppe (rhoppe@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #define KMSG_COMPONENT "hmcdrv"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/crc16.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "hmcdrv_ftp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "hmcdrv_cache.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "sclp_ftp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "diag_ftp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * struct hmcdrv_ftp_ops - HMC drive FTP operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * @startup: startup function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * @shutdown: shutdown function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * @cmd: FTP transfer function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct hmcdrv_ftp_ops {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int (*startup)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) void (*shutdown)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ssize_t (*transfer)(const struct hmcdrv_ftp_cmdspec *ftp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) size_t *fsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static enum hmcdrv_ftp_cmdid hmcdrv_ftp_cmd_getid(const char *cmd, int len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int hmcdrv_ftp_parse(char *cmd, struct hmcdrv_ftp_cmdspec *ftp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static const struct hmcdrv_ftp_ops *hmcdrv_ftp_funcs; /* current operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static DEFINE_MUTEX(hmcdrv_ftp_mutex); /* mutex for hmcdrv_ftp_funcs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static unsigned hmcdrv_ftp_refcnt; /* start/shutdown reference counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * hmcdrv_ftp_cmd_getid() - determine FTP command ID from a command string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * @cmd: FTP command string (NOT zero-terminated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * @len: length of FTP command string in @cmd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static enum hmcdrv_ftp_cmdid hmcdrv_ftp_cmd_getid(const char *cmd, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* HMC FTP command descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct hmcdrv_ftp_cmd_desc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) const char *str; /* command string */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) enum hmcdrv_ftp_cmdid cmd; /* associated command as enum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* Description of all HMC drive FTP commands
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * Notes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * 1. Array size should be a prime number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * 2. Do not change the order of commands in table (because the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * index is determined by CRC % ARRAY_SIZE).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * 3. Original command 'nlist' was renamed, else the CRC would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * collide with 'append' (see point 2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static const struct hmcdrv_ftp_cmd_desc ftpcmds[7] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {.str = "get", /* [0] get (CRC = 0x68eb) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) .cmd = HMCDRV_FTP_GET},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {.str = "dir", /* [1] dir (CRC = 0x6a9e) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .cmd = HMCDRV_FTP_DIR},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {.str = "delete", /* [2] delete (CRC = 0x53ae) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .cmd = HMCDRV_FTP_DELETE},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {.str = "nls", /* [3] nls (CRC = 0xf87c) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .cmd = HMCDRV_FTP_NLIST},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {.str = "put", /* [4] put (CRC = 0xac56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .cmd = HMCDRV_FTP_PUT},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {.str = "append", /* [5] append (CRC = 0xf56e) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .cmd = HMCDRV_FTP_APPEND},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {.str = NULL} /* [6] unused */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) const struct hmcdrv_ftp_cmd_desc *pdesc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) u16 crc = 0xffffU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return HMCDRV_FTP_NOOP; /* error indiactor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) crc = crc16(crc, cmd, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) pdesc = ftpcmds + (crc % ARRAY_SIZE(ftpcmds));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) pr_debug("FTP command '%s' has CRC 0x%04x, at table pos. %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) cmd, crc, (crc % ARRAY_SIZE(ftpcmds)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!pdesc->str || strncmp(pdesc->str, cmd, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return HMCDRV_FTP_NOOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) pr_debug("FTP command '%s' found, with ID %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) pdesc->str, pdesc->cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return pdesc->cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * hmcdrv_ftp_parse() - HMC drive FTP command parser
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * @cmd: FTP command string "<cmd> <filename>"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * @ftp: Pointer to FTP command specification buffer (output)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * Return: 0 on success, else a (negative) error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int hmcdrv_ftp_parse(char *cmd, struct hmcdrv_ftp_cmdspec *ftp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) char *start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int argc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) ftp->id = HMCDRV_FTP_NOOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ftp->fname = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) while (*cmd != '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) while (isspace(*cmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ++cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (*cmd == '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) start = cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) switch (argc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) case 0: /* 1st argument (FTP command) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) while ((*cmd != '\0') && !isspace(*cmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) ++cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ftp->id = hmcdrv_ftp_cmd_getid(start, cmd - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) case 1: /* 2nd / last argument (rest of line) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) while ((*cmd != '\0') && !iscntrl(*cmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ++cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ftp->fname = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) *cmd = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) } /* switch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) ++argc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) } /* while */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!ftp->fname || (ftp->id == HMCDRV_FTP_NOOP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * hmcdrv_ftp_do() - perform a HMC drive FTP, with data from kernel-space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * @ftp: pointer to FTP command specification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * Return: number of bytes read/written or a negative error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ssize_t hmcdrv_ftp_do(const struct hmcdrv_ftp_cmdspec *ftp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) mutex_lock(&hmcdrv_ftp_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (hmcdrv_ftp_funcs && hmcdrv_ftp_refcnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) pr_debug("starting transfer, cmd %d for '%s' at %lld with %zd bytes\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ftp->id, ftp->fname, (long long) ftp->ofs, ftp->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) len = hmcdrv_cache_cmd(ftp, hmcdrv_ftp_funcs->transfer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) len = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) mutex_unlock(&hmcdrv_ftp_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) EXPORT_SYMBOL(hmcdrv_ftp_do);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * hmcdrv_ftp_probe() - probe for the HMC drive FTP service
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * Return: 0 if service is available, else an (negative) error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int hmcdrv_ftp_probe(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct hmcdrv_ftp_cmdspec ftp = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) .id = HMCDRV_FTP_NOOP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .ofs = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .fname = "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .len = PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) ftp.buf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (!ftp.buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) rc = hmcdrv_ftp_startup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) rc = hmcdrv_ftp_do(&ftp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) hmcdrv_ftp_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) switch (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) case -ENOENT: /* no such file/media or currently busy, */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) case -EBUSY: /* but service seems to be available */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) default: /* leave 'rc' as it is for [0, -EPERM, -E...] */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (rc > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) rc = 0; /* clear length (success) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) } /* switch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) free_page((unsigned long) ftp.buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) EXPORT_SYMBOL(hmcdrv_ftp_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * hmcdrv_ftp_cmd() - Perform a HMC drive FTP, with data from user-space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * @cmd: FTP command string "<cmd> <filename>"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * @offset: file position to read/write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * @buf: user-space buffer for read/written directory/file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * @len: size of @buf (read/dir) or number of bytes to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * This function must not be called before hmcdrv_ftp_startup() was called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * Return: number of bytes read/written or a negative error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) ssize_t hmcdrv_ftp_cmd(char __kernel *cmd, loff_t offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) char __user *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int order;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct hmcdrv_ftp_cmdspec ftp = {.len = len, .ofs = offset};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) ssize_t retlen = hmcdrv_ftp_parse(cmd, &ftp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (retlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return retlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) order = get_order(ftp.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) ftp.buf = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (!ftp.buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) switch (ftp.id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) case HMCDRV_FTP_DIR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) case HMCDRV_FTP_NLIST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) case HMCDRV_FTP_GET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) retlen = hmcdrv_ftp_do(&ftp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if ((retlen >= 0) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) copy_to_user(buf, ftp.buf, retlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) retlen = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) case HMCDRV_FTP_PUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) case HMCDRV_FTP_APPEND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (!copy_from_user(ftp.buf, buf, ftp.len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) retlen = hmcdrv_ftp_do(&ftp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) retlen = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) case HMCDRV_FTP_DELETE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) retlen = hmcdrv_ftp_do(&ftp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) retlen = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) free_pages((unsigned long) ftp.buf, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return retlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * hmcdrv_ftp_startup() - startup of HMC drive FTP functionality for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * dedicated (owner) instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * Return: 0 on success, else an (negative) error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) int hmcdrv_ftp_startup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static const struct hmcdrv_ftp_ops hmcdrv_ftp_zvm = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) .startup = diag_ftp_startup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) .shutdown = diag_ftp_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) .transfer = diag_ftp_cmd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static const struct hmcdrv_ftp_ops hmcdrv_ftp_lpar = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) .startup = sclp_ftp_startup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) .shutdown = sclp_ftp_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) .transfer = sclp_ftp_cmd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) mutex_lock(&hmcdrv_ftp_mutex); /* block transfers while start-up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (hmcdrv_ftp_refcnt == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) if (MACHINE_IS_VM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) hmcdrv_ftp_funcs = &hmcdrv_ftp_zvm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) else if (MACHINE_IS_LPAR || MACHINE_IS_KVM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) hmcdrv_ftp_funcs = &hmcdrv_ftp_lpar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) rc = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (hmcdrv_ftp_funcs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) rc = hmcdrv_ftp_funcs->startup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) ++hmcdrv_ftp_refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) mutex_unlock(&hmcdrv_ftp_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) EXPORT_SYMBOL(hmcdrv_ftp_startup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * hmcdrv_ftp_shutdown() - shutdown of HMC drive FTP functionality for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * dedicated (owner) instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) void hmcdrv_ftp_shutdown(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) mutex_lock(&hmcdrv_ftp_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) --hmcdrv_ftp_refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if ((hmcdrv_ftp_refcnt == 0) && hmcdrv_ftp_funcs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) hmcdrv_ftp_funcs->shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) mutex_unlock(&hmcdrv_ftp_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) EXPORT_SYMBOL(hmcdrv_ftp_shutdown);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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