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Multiple tasks could be trying to modify NVMEM concurrently. To avoid
data corruption add a mutex which guarantees that only one thread of
execution has access to the flash storing NVMEM objects.
Various paths accessing flash contents are now protected by the same
mutex. Mutex control functions are put in wrappers, which makes it
easier to add debugging code when needed.
BRANCH=cr50, cr50-mp
BUG=b:69907320, b:130828517
TEST=attempts to take a device through RMA open do not fail any more.
Change-Id: I6424477dced20d00f6165006cd3b3968433be6d0
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1584586
Reviewed-by: Andrey Pronin <apronin@chromium.org>
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This patch eliminates unnecessary legacy nvmem.c and nvmem_vars.c code
and brings the code base to the state where the new NVMEM layout is
fully functional.
BRANCH=cr50, cr50-mp
BUG=b:69907320, b:129710256
CQ-DEPEND=CL:1450278
TEST=the following tests pass:
- test cases in ./test/nvmem.c
- TCG suite (passes on par with the existing Cr50 code with the
reduced code footprint TPM2 library)
- Chrome OS device migrates from legacy to new implementation with
user account maintained.
- Chrome OS user account is maintained over AP and H1 reboots and
deep sleep cycles.
Change-Id: If4bc2dd125873a79dbe0e268eb32100a8b8b352d
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1496607
Reviewed-by: Andrey Pronin <apronin@chromium.org>
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BRANCH=None
BUG=None
TEST=make -j buildall
Change-Id: Icf2cfb6a2657064c10721c0e527d24fbb3be6ab3
Signed-off-by: Allen Webb <allenwebb@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1330102
Reviewed-by: Mike Frysinger <vapier@chromium.org>
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The CONFIG_FLASH_NVMEM option implements persistent, reliable storage
regions in flash. This adds CONFIG_FLASH_NVMEM_VARS, which uses one of
those storage regions for free-form variables.
Refer to the comments in include/nvmem_vars.h and common/nvmem_vars.c
for usage and implementation details.
BUG=chrome-os-partner:61107
BRANCH=none
TEST=make runtests
This CL includes a number of new tests, specifically for this feature.
No target boards use this feature yet so there's nothing to test on
actual hardware, but the test/nvmem_vars executable includes console
commands ("get", "set", "print") to try it out.
Change-Id: I8597415dc3b00a1462f5b164eeb5073129030525
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/414194
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
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