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SubjectRe: [PATCH v2 05/11] pstore/blk: blkoops: support ftrace recorder
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hi Kees Cook,

On 2020/3/19 AM 2:19, Kees Cook wrote:
> On Fri, Feb 07, 2020 at 08:25:49PM +0800, WeiXiong Liao wrote:
>> Support recorder for ftrace. To enable ftrace recorder, just make
>> ftrace_size be greater than 0 and a multiple of 4096.
>>
>> Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com>
>> ---
>> fs/pstore/Kconfig | 12 ++++++++
>> fs/pstore/blkoops.c | 11 +++++++
>> fs/pstore/blkzone.c | 75 ++++++++++++++++++++++++++++++++++++++++++++--
>> include/linux/pstore_blk.h | 4 +++
>> 4 files changed, 99 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
>> index 5f0a42823028..308a0a4c5ee5 100644
>> --- a/fs/pstore/Kconfig
>> +++ b/fs/pstore/Kconfig
>> @@ -210,6 +210,18 @@ config PSTORE_BLKOOPS_CONSOLE_SIZE
>> NOTE that, both kconfig and module parameters can configure blkoops,
>> but module parameters have priority over kconfig.
>>
>> +config PSTORE_BLKOOPS_FTRACE_SIZE
>> + int "ftrace size in kbytes for blkoops"
>> + depends on PSTORE_BLKOOPS
>> + depends on PSTORE_FTRACE
>> + default 64
>
> Same tricks. :)
>

Sure. We can discuss on patch 2 and I will fix it to all over the series
patches.

>> + help
>> + This just sets size of ftrace (ftrace_size) for pstore/blk. The
>> + size is in KB and must be a multiple of 4.
>> +
>> + NOTE that, both kconfig and module parameters can configure blkoops,
>> + but module parameters have priority over kconfig.
>> +
>> config PSTORE_BLKOOPS_BLKDEV
>> string "block device for blkoops"
>> depends on PSTORE_BLKOOPS
>> diff --git a/fs/pstore/blkoops.c b/fs/pstore/blkoops.c
>> index 05990bc3b168..c76bab671b0b 100644
>> --- a/fs/pstore/blkoops.c
>> +++ b/fs/pstore/blkoops.c
>> @@ -24,6 +24,10 @@
>> module_param(console_size, long, 0400);
>> MODULE_PARM_DESC(console_size, "console size in kbytes");
>>
>> +static long ftrace_size = -1;
>> +module_param(ftrace_size, long, 0400);
>> +MODULE_PARM_DESC(ftrace_size, "ftrace size in kbytes");
>> +
>> static int dump_oops = -1;
>> module_param(dump_oops, int, 0400);
>> MODULE_PARM_DESC(total_size, "whether dump oops");
>> @@ -80,6 +84,12 @@
>> #define DEFAULT_CONSOLE_SIZE 0
>> #endif
>>
>> +#ifdef CONFIG_PSTORE_BLKOOPS_FTRACE_SIZE
>> +#define DEFAULT_FTRACE_SIZE CONFIG_PSTORE_BLKOOPS_FTRACE_SIZE
>> +#else
>> +#define DEFAULT_FTRACE_SIZE 0
>> +#endif
>> +
>> #ifdef CONFIG_PSTORE_BLKOOPS_DUMP_OOPS
>> #define DEFAULT_DUMP_OOPS CONFIG_PSTORE_BLKOOPS_DUMP_OOPS
>> #else
>> @@ -135,6 +145,7 @@ int blkoops_register_device(struct blkoops_device *bo_dev)
>> verify_size(dmesg_size, DEFAULT_DMESG_SIZE, 4096);
>> verify_size(pmsg_size, DEFAULT_PMSG_SIZE, 4096);
>> verify_size(console_size, DEFAULT_CONSOLE_SIZE, 4096);
>> + verify_size(ftrace_size, DEFAULT_FTRACE_SIZE, 4096);
>> #undef verify_size
>> dump_oops = !!(dump_oops < 0 ? DEFAULT_DUMP_OOPS : dump_oops);
>>
>> diff --git a/fs/pstore/blkzone.c b/fs/pstore/blkzone.c
>> index 9a7e9b06ccf7..442e5a5bbfda 100644
>> --- a/fs/pstore/blkzone.c
>> +++ b/fs/pstore/blkzone.c
>> @@ -89,10 +89,13 @@ struct blkz_context {
>> struct blkz_zone **dbzs; /* dmesg block zones */
>> struct blkz_zone *pbz; /* Pmsg block zone */
>> struct blkz_zone *cbz; /* console block zone */
>> + struct blkz_zone **fbzs; /* Ftrace zones */
>> unsigned int dmesg_max_cnt;
>> unsigned int dmesg_read_cnt;
>> unsigned int pmsg_read_cnt;
>> unsigned int console_read_cnt;
>> + unsigned int ftrace_max_cnt;
>> + unsigned int ftrace_read_cnt;
>> unsigned int dmesg_write_cnt;
>> /*
>> * the counter should be recovered when recover.
>> @@ -281,6 +284,7 @@ static void blkz_flush_all_dirty_zones(struct work_struct *work)
>> blkz_flush_dirty_zone(cxt->pbz);
>> blkz_flush_dirty_zone(cxt->cbz);
>> blkz_flush_dirty_zones(cxt->dbzs, cxt->dmesg_max_cnt);
>> + blkz_flush_dirty_zones(cxt->fbzs, cxt->ftrace_max_cnt);
>> }
>>
>> static int blkz_recover_dmesg_data(struct blkz_context *cxt)
>> @@ -497,6 +501,31 @@ static int blkz_recover_zone(struct blkz_context *cxt, struct blkz_zone *zone)
>> return ret;
>> }
>>
>> +static int blkz_recover_zones(struct blkz_context *cxt,
>> + struct blkz_zone **zones, unsigned int cnt)
>> +{
>> + int ret;
>> + unsigned int i;
>> + struct blkz_zone *zone;
>> +
>> + if (!zones)
>> + return 0;
>> +
>> + for (i = 0; i < cnt; i++) {
>> + zone = zones[i];
>> + if (unlikely(!zone))
>> + continue;
>> + ret = blkz_recover_zone(cxt, zone);
>> + if (ret)
>> + goto recover_fail;
>> + }
>> +
>> + return 0;
>> +recover_fail:
>> + pr_debug("recover %s[%u] failed\n", zone->name, i);
>> + return ret;
>> +}
>
> Why is this introduced here? Shouldn't this be earlier in the series?
>

blkz_recover_zones() is used to recover a array of zones. Only ftrace
recorder
need it, so it's introduced here.

>> +
>> static inline int blkz_recovery(struct blkz_context *cxt)
>> {
>> int ret = -EBUSY;
>> @@ -516,6 +545,10 @@ static inline int blkz_recovery(struct blkz_context *cxt)
>> if (ret)
>> goto recover_fail;
>>
>> + ret = blkz_recover_zones(cxt, cxt->fbzs, cxt->ftrace_max_cnt);
>> + if (ret)
>> + goto recover_fail;
>> +
>> pr_debug("recover end!\n");
>> atomic_set(&cxt->recovered, 1);
>> return 0;
>> @@ -532,6 +565,7 @@ static int blkz_pstore_open(struct pstore_info *psi)
>> cxt->dmesg_read_cnt = 0;
>> cxt->pmsg_read_cnt = 0;
>> cxt->console_read_cnt = 0;
>> + cxt->ftrace_read_cnt = 0;
>> return 0;
>> }
>>
>> @@ -589,6 +623,8 @@ static int blkz_pstore_erase(struct pstore_record *record)
>> return blkz_record_erase(cxt, cxt->pbz);
>> case PSTORE_TYPE_CONSOLE:
>> return blkz_record_erase(cxt, cxt->cbz);
>> + case PSTORE_TYPE_FTRACE:
>> + return blkz_record_erase(cxt, cxt->fbzs[record->id]);
>> default: return -EINVAL;
>> }
>> }
>> @@ -743,6 +779,13 @@ static int notrace blkz_pstore_write(struct pstore_record *record)
>> return blkz_record_write(cxt, cxt->cbz, record);
>> case PSTORE_TYPE_PMSG:
>> return blkz_record_write(cxt, cxt->pbz, record);
>> + case PSTORE_TYPE_FTRACE: {
>> + int zonenum = smp_processor_id();
>> +
>> + if (!cxt->fbzs)
>> + return -ENOSPC;
>> + return blkz_record_write(cxt, cxt->fbzs[zonenum], record);
>> + }
>> default:
>> return -EINVAL;
>> }
>> @@ -759,6 +802,12 @@ static struct blkz_zone *blkz_read_next_zone(struct blkz_context *cxt)
>> return zone;
>> }
>>
>> + while (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt) {
>> + zone = cxt->fbzs[cxt->ftrace_read_cnt++];
>> + if (blkz_old_ok(zone))
>> + return zone;
>> + }
>> +
>> if (cxt->pmsg_read_cnt == 0) {
>> cxt->pmsg_read_cnt++;
>> zone = cxt->pbz;
>> @@ -881,6 +930,9 @@ static ssize_t blkz_pstore_read(struct pstore_record *record)
>> readop = blkz_dmesg_read;
>> record->id = cxt->dmesg_read_cnt - 1;
>> break;
>> + case PSTORE_TYPE_FTRACE:
>> + record->id = cxt->ftrace_read_cnt - 1;
>> + /* fallthrough */
>
> Please mark with "fallthrough;".
> https://www.kernel.org/doc/html/latest/process/deprecated.html#implicit-switch-case-fall-through
>

Fixed.

>> case PSTORE_TYPE_CONSOLE:
>> /* fallthrough */
>> case PSTORE_TYPE_PMSG:
>> @@ -1046,15 +1098,27 @@ static int blkz_cut_zones(struct blkz_context *cxt)
>> goto free_pmsg;
>> }
>>
>> + off_size += info->ftrace_size;
>> + cxt->fbzs = blkz_init_zones(PSTORE_TYPE_FTRACE, &off,
>> + info->ftrace_size,
>> + info->ftrace_size / nr_cpu_ids,
>> + &cxt->ftrace_max_cnt);
>> + if (IS_ERR(cxt->fbzs)) {
>> + err = PTR_ERR(cxt->fbzs);
>> + goto free_console;
>> + }
>> +
>> cxt->dbzs = blkz_init_zones(PSTORE_TYPE_DMESG, &off,
>> info->total_size - off_size,
>> info->dmesg_size, &cxt->dmesg_max_cnt);
>> if (IS_ERR(cxt->dbzs)) {
>> err = PTR_ERR(cxt->dbzs);
>> - goto free_console;
>> + goto free_ftrace;
>> }
>>
>> return 0;
>> +free_ftrace:
>> + blkz_free_zones(&cxt->fbzs, &cxt->ftrace_max_cnt);
>> free_console:
>> blkz_free_zone(&cxt->cbz);
>> free_pmsg:
>> @@ -1103,6 +1167,7 @@ int blkz_register(struct blkz_info *info)
>> check_size(dmesg_size, SECTOR_SIZE);
>> check_size(pmsg_size, SECTOR_SIZE);
>> check_size(console_size, SECTOR_SIZE);
>> + check_size(ftrace_size, SECTOR_SIZE);
>>
>> #undef check_size
>>
>> @@ -1136,6 +1201,7 @@ int blkz_register(struct blkz_info *info)
>> pr_debug("\tdmesg size : %ld Bytes\n", info->dmesg_size);
>> pr_debug("\tpmsg size : %ld Bytes\n", info->pmsg_size);
>> pr_debug("\tconsole size : %ld Bytes\n", info->console_size);
>> + pr_debug("\tftrace size : %ld Bytes\n", info->ftrace_size);
>>
>> err = blkz_cut_zones(cxt);
>> if (err) {
>> @@ -1159,13 +1225,16 @@ int blkz_register(struct blkz_info *info)
>> cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
>> if (info->console_size)
>> cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
>> + if (info->ftrace_size)
>> + cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
>>
>> - pr_info("Registered %s as blkzone backend for %s%s%s%s\n",
>> + pr_info("Registered %s as blkzone backend for %s%s%s%s%s\n",
>> info->name,
>> cxt->dbzs && cxt->bzinfo->dump_oops ? "Oops " : "",
>> cxt->dbzs && cxt->bzinfo->panic_write ? "Panic " : "",
>> cxt->pbz ? "Pmsg " : "",
>> - cxt->cbz ? "Console" : "");
>> + cxt->cbz ? "Console " : "",
>> + cxt->fbzs ? "Ftrace" : "");
>>
>> err = pstore_register(&cxt->pstore);
>> if (err) {
>> diff --git a/include/linux/pstore_blk.h b/include/linux/pstore_blk.h
>> index 546375e04419..77704c1b404a 100644
>> --- a/include/linux/pstore_blk.h
>> +++ b/include/linux/pstore_blk.h
>> @@ -25,6 +25,9 @@
>> * @console_size:
>> * The size of zone for console. Zero means disabled, othewise, it must
>> * be multiple of SECTOR_SIZE(512).
>> + * @ftrace_size:
>> + * The size of zone for ftrace. Zero means disabled, othewise, it must
>> + * be multiple of SECTOR_SIZE(512).
>> * @dump_oops:
>> * Dump oops and panic log or only panic.
>> * @read, @write:
>> @@ -60,6 +63,7 @@ struct blkz_info {
>> unsigned long dmesg_size;
>> unsigned long pmsg_size;
>> unsigned long console_size;
>> + unsigned long ftrace_size;
>> int dump_oops;
>> blkz_read_op read;
>> blkz_write_op write;
>> --
>> 1.9.1
>>
>

--
WeiXiong Liao

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