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The Read While Write (RWW) feature allows to perform reads from the
flash array into cache while a program (from cache) or an erase
operation happens, provided that the two areas are located on different
banks.
The main benefit is the possible reduced latency when requesting to read
a page while a much longer operation is ongoing, like a write or an
erase.
We can try to compare the positive impact of such a feature by enhancing
the flash_speed test tool with the following test:
- Measure the time taken by an eraseblock write in parallel with an
eraseblock read.
- Measure when the read operation ends.
- Compare the two to get the latency saved with the RWW feature.
To be sure the mtd_write actually starts (and acquires the necessary
locks) before the mtd_read does, we use SCHED_FIFO at rather high
(arbitrary) priorities, respectively 42 and 41.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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In order to be able to have interleaved measures, let's not use the
start and finish global variables from the time helpers directly,
provide parameters for these variables so that we can provide either the
global entries, or more specific ones when relevant.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Same fix as a2c6bbc ("mtd-tests: Read and write pages during speed
tests") but applied to flash_readtest and flash_stress.
Resolves failure of flash_readtest when subpages are present. The test
reads a (sub)page followed by the entire OOB. Upon reaching the 2nd
subpage, the OOB read fails because it is beyond the end of OOB.
Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The speed test does reads and writes of different sizes:
- eraseblock
- page
- two pages
At least this is the theory because, as opposed to the legacy kernel
module doing the same measurement, the userspace tool uses the subpage
size (hence accessing the same page 4, 8 or 16 times depending on the
subpage setting). Of course if the controller does not support subpages,
this issue is not visible.
Use mtd.min_io_size instead for non-NOR devices in order to get the
right bandwidth (at least one that fits the logs).
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Remove "install tests" configure option, we already have an option
whether to build tests or not. Don't try to work around autotools
semantics that people building the package expect.
- Fix the installation path by propperly defining it and using the
correct name for the libexec path.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The function insert_biterror should be designed to insert error at
the first '1' bit starting at offset byte.
But now, only bit 7 of each byte is checked, because checking mask
is always 0x80.
So, do right shift for checking mask after each checking to check
the whole 8 bits of each bytes.
Signed-off-by: Xiaolei Li <xiaolei.li@mediatek.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Fix warnings abot PRIdoff_t in libmtd.c, in mtd_read (and mtd_write):
In file included from ../git/lib/libmtd.c:40:0:
../git/lib/libmtd.c: In function 'mtd_read':
../git/include/common.h:110:18: warning: format '%ld' expects argument of
type 'long int', but argument 5 has type 'off_t {aka long long int}'
[-Wformat=]
../git/include/common.h:120:2: note: in expansion of macro 'errmsg'
errmsg(fmt, ##__VA_ARGS__); \
^~~~~~
../git/lib/libmtd.c:1082:10: note: in expansion of macro 'sys_errmsg'
return sys_errmsg("cannot seek mtd%d to offset %"PRIdoff_t,
^~~~~~~~~~
/usr/lib/klibc/include/inttypes.h:28:17: note: format string is defined here
#define PRId32 "d"
Signed-off-by: Thorsten Glaser <tg@mirbsd.org>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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When there is only a single erase block, the cross erase test
does not report sensible errors. Warn in case there is only
a single erase block instead of executing the test.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If the number of erase blocks to use is not specified, ebcnt originally
set to -1 leads the program to exit with:
"Cannot run with less than two blocks."
If the number of erase blocks to use is not specified and thus ebcnt is
equal to -1, the expected behaviour is to perform the test on all the
erase blocks of the mtd partition.
This fixes the change introduced in
4458ad6481f60d9884925d5bc62a7954880d181b.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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When porting some of the mtd-tests to user space, some code was
simplified. Among others, a while loop that iterates of page contents
was replaced with a for loop, but the old increment was left in place,
so every second byte was skipped.
This patch removes the erroneous second increment.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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A common pattern in command line processing is having a usage()
function that prints out how to use the command line options and
then terminates.
The function is typically used inside a switch block for command
line options like `-h' or unknown options. In a lot of places, the
break keyword is omitted, because the function exits anyway. However,
this triggers gcc warnings about implicit fall-through.
Rather than adding a phony "/* fall-through */" this patch flags the
usage() style function with a gcc attribute, indicating that they do
not return and removes further superfluous break statements.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Forbid the use of less than 2 eraseblocks in nandpagetest. It is obvious
that the test cannot run on zero block, but it cannot run on only one
block neither. The reason is: get_first_and_last_block() will return the
same id for both the first and the last blocks. In erasecrosstest(),
the logic is:
- erase/write/read/verify first block
- erase/write again first block
- erase *last* block
- read/verify first block
When using only one block, 'first' refers to the same block as 'last',
leading to erasing the block before reading it. Hence, the test would
fail with no actual reason.
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Bit flip detection for written and erased pages tend to have different
implementations. Where written pages are detected and corrected using
ECC, erased pages are typically detected by ensuring that the number of
zeros is less than a specified threshold.
As such, it's necessary to have the 'nandbiterrs' test support the
testing of written and erased pages. Bit flips in erased pages are
emulated by rewriting the page in raw mode, to prevent the use of ECC.
Signed-off-by: Harpreet Eli Sangha <harpreet@nestlabs.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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After a page read, the old failure statistics are compared against the
new failure statistics before the new values are actually read.
Signed-off-by: Harpreet "Eli" Sangha <harpreet@nestlabs.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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On 32bit systems (e.g. ARM) the size of off_t can be 4 byte and the size of loff_t 8 byte.
This causes compiler warnings like the following:
flash_erase.c: In function 'show_progress':
flash_erase.c:56:22: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'off_t {aka long int}' [-Wformat=]
bareverbose(!quiet, "\rErasing %d Kibyte @ %"PRIxoff_t" -- %2i %% complete ",
and an output like this:
~# flash_erase /dev/mtd2 0 1
Erasing 64 Kibyte @ 6400000000 -- 0 % complete
~#
Since the size of off_t and loff_t can differ from each other, the
printf format specifier should be determined separately for both.
Further the format specifiers should be based directly on the size of the
particular data type.
Signed-off-by: Torsten Fleischer <torfl6749@gmail.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Basically a user space port of the mtd sub page test kernel module.
In addition to the module parameters, the utility supports using
only a sub-range of the flash erase blocks with a configurable
stride and can restore the block contents after the test.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Basically a user space port of the mtd page test kernel module.
In addition to the module parameters, the utility supports using
only a sub-range of the flash erase blocks with a configurable stride.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Basically a user space port of the mtd read test kernel module.
In addition to the module parameters, the utility can scan only
a sub-range of the flash erase block with a configurable stride.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Basically a user space port of the mtd speed test kernel module.
In addition to the module parameters, the utility can resture
the block contents after test and allows setting the maxium writes
for the test.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Basically a user space port of the mtd speed test kernel module.
In addition to the block offset and count module parameters, the
utility supports a block stride and can restore the block contents
after test. Furthermore, a flag can be used to disable destructive
tests (i.e. only perform read speed tests).
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Basically a user space port of the mtd stress test kernel module.
In addition to the block offset and count module parameters, the
utility supports a block stride and can restore the block contents
after test.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Basically a user space port of the mtd torture test kernel module. In
addition to the block offset and count module parameters, the utility
supports a block stride and can restore the block contents after test.
In contrast to the kernel module, the torture test is implemented by
the libmtd mtd_toruture function and thus doesn't allow for similarly
fine grained options on diagnostics.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
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