From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/mtd/ubi/debug.c | 605 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 605 insertions(+) create mode 100644 drivers/mtd/ubi/debug.c (limited to 'drivers/mtd/ubi/debug.c') diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c new file mode 100644 index 000000000..fcca6942d --- /dev/null +++ b/drivers/mtd/ubi/debug.c @@ -0,0 +1,605 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) International Business Machines Corp., 2006 + * + * Author: Artem Bityutskiy (Битюцкий Артём) + */ + +#include "ubi.h" +#include +#include +#include +#include + + +/** + * ubi_dump_flash - dump a region of flash. + * @ubi: UBI device description object + * @pnum: the physical eraseblock number to dump + * @offset: the starting offset within the physical eraseblock to dump + * @len: the length of the region to dump + */ +void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len) +{ + int err; + size_t read; + void *buf; + loff_t addr = (loff_t)pnum * ubi->peb_size + offset; + + buf = vmalloc(len); + if (!buf) + return; + err = mtd_read(ubi->mtd, addr, len, &read, buf); + if (err && err != -EUCLEAN) { + ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes", + err, len, pnum, offset, read); + goto out; + } + + ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d", + len, pnum, offset); + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); +out: + vfree(buf); + return; +} + +/** + * ubi_dump_ec_hdr - dump an erase counter header. + * @ec_hdr: the erase counter header to dump + */ +void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr) +{ + pr_err("Erase counter header dump:\n"); + pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic)); + pr_err("\tversion %d\n", (int)ec_hdr->version); + pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec)); + pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset)); + pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset)); + pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq)); + pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc)); + pr_err("erase counter header hexdump:\n"); + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, + ec_hdr, UBI_EC_HDR_SIZE, 1); +} + +/** + * ubi_dump_vid_hdr - dump a volume identifier header. + * @vid_hdr: the volume identifier header to dump + */ +void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr) +{ + pr_err("Volume identifier header dump:\n"); + pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic)); + pr_err("\tversion %d\n", (int)vid_hdr->version); + pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type); + pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag); + pr_err("\tcompat %d\n", (int)vid_hdr->compat); + pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id)); + pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum)); + pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size)); + pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs)); + pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad)); + pr_err("\tsqnum %llu\n", + (unsigned long long)be64_to_cpu(vid_hdr->sqnum)); + pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc)); + pr_err("Volume identifier header hexdump:\n"); + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, + vid_hdr, UBI_VID_HDR_SIZE, 1); +} + +/** + * ubi_dump_vol_info - dump volume information. + * @vol: UBI volume description object + */ +void ubi_dump_vol_info(const struct ubi_volume *vol) +{ + pr_err("Volume information dump:\n"); + pr_err("\tvol_id %d\n", vol->vol_id); + pr_err("\treserved_pebs %d\n", vol->reserved_pebs); + pr_err("\talignment %d\n", vol->alignment); + pr_err("\tdata_pad %d\n", vol->data_pad); + pr_err("\tvol_type %d\n", vol->vol_type); + pr_err("\tname_len %d\n", vol->name_len); + pr_err("\tusable_leb_size %d\n", vol->usable_leb_size); + pr_err("\tused_ebs %d\n", vol->used_ebs); + pr_err("\tused_bytes %lld\n", vol->used_bytes); + pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes); + pr_err("\tcorrupted %d\n", vol->corrupted); + pr_err("\tupd_marker %d\n", vol->upd_marker); + pr_err("\tskip_check %d\n", vol->skip_check); + + if (vol->name_len <= UBI_VOL_NAME_MAX && + strnlen(vol->name, vol->name_len + 1) == vol->name_len) { + pr_err("\tname %s\n", vol->name); + } else { + pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", + vol->name[0], vol->name[1], vol->name[2], + vol->name[3], vol->name[4]); + } +} + +/** + * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object. + * @r: the object to dump + * @idx: volume table index + */ +void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx) +{ + int name_len = be16_to_cpu(r->name_len); + + pr_err("Volume table record %d dump:\n", idx); + pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs)); + pr_err("\talignment %d\n", be32_to_cpu(r->alignment)); + pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad)); + pr_err("\tvol_type %d\n", (int)r->vol_type); + pr_err("\tupd_marker %d\n", (int)r->upd_marker); + pr_err("\tname_len %d\n", name_len); + + if (r->name[0] == '\0') { + pr_err("\tname NULL\n"); + return; + } + + if (name_len <= UBI_VOL_NAME_MAX && + strnlen(&r->name[0], name_len + 1) == name_len) { + pr_err("\tname %s\n", &r->name[0]); + } else { + pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", + r->name[0], r->name[1], r->name[2], r->name[3], + r->name[4]); + } + pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc)); +} + +/** + * ubi_dump_av - dump a &struct ubi_ainf_volume object. + * @av: the object to dump + */ +void ubi_dump_av(const struct ubi_ainf_volume *av) +{ + pr_err("Volume attaching information dump:\n"); + pr_err("\tvol_id %d\n", av->vol_id); + pr_err("\thighest_lnum %d\n", av->highest_lnum); + pr_err("\tleb_count %d\n", av->leb_count); + pr_err("\tcompat %d\n", av->compat); + pr_err("\tvol_type %d\n", av->vol_type); + pr_err("\tused_ebs %d\n", av->used_ebs); + pr_err("\tlast_data_size %d\n", av->last_data_size); + pr_err("\tdata_pad %d\n", av->data_pad); +} + +/** + * ubi_dump_aeb - dump a &struct ubi_ainf_peb object. + * @aeb: the object to dump + * @type: object type: 0 - not corrupted, 1 - corrupted + */ +void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type) +{ + pr_err("eraseblock attaching information dump:\n"); + pr_err("\tec %d\n", aeb->ec); + pr_err("\tpnum %d\n", aeb->pnum); + if (type == 0) { + pr_err("\tlnum %d\n", aeb->lnum); + pr_err("\tscrub %d\n", aeb->scrub); + pr_err("\tsqnum %llu\n", aeb->sqnum); + } +} + +/** + * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object. + * @req: the object to dump + */ +void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req) +{ + char nm[17]; + + pr_err("Volume creation request dump:\n"); + pr_err("\tvol_id %d\n", req->vol_id); + pr_err("\talignment %d\n", req->alignment); + pr_err("\tbytes %lld\n", (long long)req->bytes); + pr_err("\tvol_type %d\n", req->vol_type); + pr_err("\tname_len %d\n", req->name_len); + + memcpy(nm, req->name, 16); + nm[16] = 0; + pr_err("\t1st 16 characters of name: %s\n", nm); +} + +/* + * Root directory for UBI stuff in debugfs. Contains sub-directories which + * contain the stuff specific to particular UBI devices. + */ +static struct dentry *dfs_rootdir; + +/** + * ubi_debugfs_init - create UBI debugfs directory. + * + * Create UBI debugfs directory. Returns zero in case of success and a negative + * error code in case of failure. + */ +int ubi_debugfs_init(void) +{ + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + + dfs_rootdir = debugfs_create_dir("ubi", NULL); + if (IS_ERR_OR_NULL(dfs_rootdir)) { + int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV; + + pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n", + err); + return err; + } + + return 0; +} + +/** + * ubi_debugfs_exit - remove UBI debugfs directory. + */ +void ubi_debugfs_exit(void) +{ + if (IS_ENABLED(CONFIG_DEBUG_FS)) + debugfs_remove(dfs_rootdir); +} + +/* Read an UBI debugfs file */ +static ssize_t dfs_file_read(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + unsigned long ubi_num = (unsigned long)file->private_data; + struct dentry *dent = file->f_path.dentry; + struct ubi_device *ubi; + struct ubi_debug_info *d; + char buf[8]; + int val; + + ubi = ubi_get_device(ubi_num); + if (!ubi) + return -ENODEV; + d = &ubi->dbg; + + if (dent == d->dfs_chk_gen) + val = d->chk_gen; + else if (dent == d->dfs_chk_io) + val = d->chk_io; + else if (dent == d->dfs_chk_fastmap) + val = d->chk_fastmap; + else if (dent == d->dfs_disable_bgt) + val = d->disable_bgt; + else if (dent == d->dfs_emulate_bitflips) + val = d->emulate_bitflips; + else if (dent == d->dfs_emulate_io_failures) + val = d->emulate_io_failures; + else if (dent == d->dfs_emulate_power_cut) { + snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut); + count = simple_read_from_buffer(user_buf, count, ppos, + buf, strlen(buf)); + goto out; + } else if (dent == d->dfs_power_cut_min) { + snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min); + count = simple_read_from_buffer(user_buf, count, ppos, + buf, strlen(buf)); + goto out; + } else if (dent == d->dfs_power_cut_max) { + snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max); + count = simple_read_from_buffer(user_buf, count, ppos, + buf, strlen(buf)); + goto out; + } + else { + count = -EINVAL; + goto out; + } + + if (val) + buf[0] = '1'; + else + buf[0] = '0'; + buf[1] = '\n'; + buf[2] = 0x00; + + count = simple_read_from_buffer(user_buf, count, ppos, buf, 2); + +out: + ubi_put_device(ubi); + return count; +} + +/* Write an UBI debugfs file */ +static ssize_t dfs_file_write(struct file *file, const char __user *user_buf, + size_t count, loff_t *ppos) +{ + unsigned long ubi_num = (unsigned long)file->private_data; + struct dentry *dent = file->f_path.dentry; + struct ubi_device *ubi; + struct ubi_debug_info *d; + size_t buf_size; + char buf[8] = {0}; + int val; + + ubi = ubi_get_device(ubi_num); + if (!ubi) + return -ENODEV; + d = &ubi->dbg; + + buf_size = min_t(size_t, count, (sizeof(buf) - 1)); + if (copy_from_user(buf, user_buf, buf_size)) { + count = -EFAULT; + goto out; + } + + if (dent == d->dfs_power_cut_min) { + if (kstrtouint(buf, 0, &d->power_cut_min) != 0) + count = -EINVAL; + goto out; + } else if (dent == d->dfs_power_cut_max) { + if (kstrtouint(buf, 0, &d->power_cut_max) != 0) + count = -EINVAL; + goto out; + } else if (dent == d->dfs_emulate_power_cut) { + if (kstrtoint(buf, 0, &val) != 0) + count = -EINVAL; + else + d->emulate_power_cut = val; + goto out; + } + + if (buf[0] == '1') + val = 1; + else if (buf[0] == '0') + val = 0; + else { + count = -EINVAL; + goto out; + } + + if (dent == d->dfs_chk_gen) + d->chk_gen = val; + else if (dent == d->dfs_chk_io) + d->chk_io = val; + else if (dent == d->dfs_chk_fastmap) + d->chk_fastmap = val; + else if (dent == d->dfs_disable_bgt) + d->disable_bgt = val; + else if (dent == d->dfs_emulate_bitflips) + d->emulate_bitflips = val; + else if (dent == d->dfs_emulate_io_failures) + d->emulate_io_failures = val; + else + count = -EINVAL; + +out: + ubi_put_device(ubi); + return count; +} + +/* File operations for all UBI debugfs files except + * detailed_erase_block_info + */ +static const struct file_operations dfs_fops = { + .read = dfs_file_read, + .write = dfs_file_write, + .open = simple_open, + .llseek = no_llseek, + .owner = THIS_MODULE, +}; + +/* As long as the position is less then that total number of erase blocks, + * we still have more to print. + */ +static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos) +{ + struct ubi_device *ubi = s->private; + + if (*pos < ubi->peb_count) + return pos; + + return NULL; +} + +/* Since we are using the position as the iterator, we just need to check if we + * are done and increment the position. + */ +static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos) +{ + struct ubi_device *ubi = s->private; + + (*pos)++; + + if (*pos < ubi->peb_count) + return pos; + + return NULL; +} + +static void eraseblk_count_seq_stop(struct seq_file *s, void *v) +{ +} + +static int eraseblk_count_seq_show(struct seq_file *s, void *iter) +{ + struct ubi_device *ubi = s->private; + struct ubi_wl_entry *wl; + int *block_number = iter; + int erase_count = -1; + int err; + + /* If this is the start, print a header */ + if (*block_number == 0) + seq_puts(s, "physical_block_number\terase_count\n"); + + err = ubi_io_is_bad(ubi, *block_number); + if (err) + return err; + + spin_lock(&ubi->wl_lock); + + wl = ubi->lookuptbl[*block_number]; + if (wl) + erase_count = wl->ec; + + spin_unlock(&ubi->wl_lock); + + if (erase_count < 0) + return 0; + + seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count); + + return 0; +} + +static const struct seq_operations eraseblk_count_seq_ops = { + .start = eraseblk_count_seq_start, + .next = eraseblk_count_seq_next, + .stop = eraseblk_count_seq_stop, + .show = eraseblk_count_seq_show +}; + +static int eraseblk_count_open(struct inode *inode, struct file *f) +{ + struct seq_file *s; + int err; + + err = seq_open(f, &eraseblk_count_seq_ops); + if (err) + return err; + + s = f->private_data; + s->private = ubi_get_device((unsigned long)inode->i_private); + + if (!s->private) + return -ENODEV; + else + return 0; +} + +static int eraseblk_count_release(struct inode *inode, struct file *f) +{ + struct seq_file *s = f->private_data; + struct ubi_device *ubi = s->private; + + ubi_put_device(ubi); + + return seq_release(inode, f); +} + +static const struct file_operations eraseblk_count_fops = { + .owner = THIS_MODULE, + .open = eraseblk_count_open, + .read = seq_read, + .llseek = seq_lseek, + .release = eraseblk_count_release, +}; + +/** + * ubi_debugfs_init_dev - initialize debugfs for an UBI device. + * @ubi: UBI device description object + * + * This function creates all debugfs files for UBI device @ubi. Returns zero in + * case of success and a negative error code in case of failure. + */ +int ubi_debugfs_init_dev(struct ubi_device *ubi) +{ + unsigned long ubi_num = ubi->ubi_num; + struct ubi_debug_info *d = &ubi->dbg; + int n; + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + + n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, + ubi->ubi_num); + if (n > UBI_DFS_DIR_LEN) { + /* The array size is too small */ + return -EINVAL; + } + + d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir); + + d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir, + (void *)ubi_num, &dfs_fops); + + d->dfs_chk_io = debugfs_create_file("chk_io", S_IWUSR, d->dfs_dir, + (void *)ubi_num, &dfs_fops); + + d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", S_IWUSR, + d->dfs_dir, (void *)ubi_num, + &dfs_fops); + + d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", S_IWUSR, + d->dfs_dir, (void *)ubi_num, + &dfs_fops); + + d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips", + S_IWUSR, d->dfs_dir, + (void *)ubi_num, + &dfs_fops); + + d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures", + S_IWUSR, d->dfs_dir, + (void *)ubi_num, + &dfs_fops); + + d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut", + S_IWUSR, d->dfs_dir, + (void *)ubi_num, + &dfs_fops); + + d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min", + S_IWUSR, d->dfs_dir, + (void *)ubi_num, &dfs_fops); + + d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max", + S_IWUSR, d->dfs_dir, + (void *)ubi_num, &dfs_fops); + + debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir, + (void *)ubi_num, &eraseblk_count_fops); + + return 0; +} + +/** + * ubi_debugfs_exit_dev - free all debugfs files corresponding to device @ubi + * @ubi: UBI device description object + */ +void ubi_debugfs_exit_dev(struct ubi_device *ubi) +{ + if (IS_ENABLED(CONFIG_DEBUG_FS)) + debugfs_remove_recursive(ubi->dbg.dfs_dir); +} + +/** + * ubi_dbg_power_cut - emulate a power cut if it is time to do so + * @ubi: UBI device description object + * @caller: Flags set to indicate from where the function is being called + * + * Returns non-zero if a power cut was emulated, zero if not. + */ +int ubi_dbg_power_cut(struct ubi_device *ubi, int caller) +{ + unsigned int range; + + if ((ubi->dbg.emulate_power_cut & caller) == 0) + return 0; + + if (ubi->dbg.power_cut_counter == 0) { + ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min; + + if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) { + range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min; + ubi->dbg.power_cut_counter += get_random_u32_below(range); + } + return 0; + } + + ubi->dbg.power_cut_counter--; + if (ubi->dbg.power_cut_counter) + return 0; + + ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX"); + ubi_ro_mode(ubi); + return 1; +} -- cgit v1.2.3