Originally cros_async was not permitted to depend on base, and as such
was precluded from using RawDescriptor/AsRawDescriptor. Now that we can
use base, we are switching over to those types/traits as they allow for
much cleaner cross platform code.
BUG=b:228904576
TEST=builds (also tested applying downstream).
Change-Id: Id5da60b127656568069795707a48beca1a015151
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3584139
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
Major changes:
* Adds Windows implementations
* Refactors cros_async to use the styleguide for cross platform code.
* Adds platform specific Descriptor impls to Timer & Event (short term;
this will go away in the next CL in the series).
Minor adjustments:
* The doctests for the Executor were passing the wrong type of seek
parameter to write_from_vec. It was disabling seeking (None) when it
should have been seeking to zero (Some(0)).
BUG=b:213147081
TEST=tested by Windows & Linux bots.
Change-Id: Id7e025ceb9f1be4a165de1e9ba824cf60dd076ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3579735
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
fallocate modes were previously unix specific constants, which won't work after
we add support for Winodws. Here, we've put a generic abstraction in place so
that each platform can implement the details as appropriate.
Thanks to acourbot@ for suggesting the splits in this series.
BUG=b:213147081
TEST=see final CL in series.
Change-Id: I822ad6c4a26eea716482029e8a6c0489aa72c595
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3583613
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
EventFd is the original sys_util era Unix-specific Event. We need to use
base::Event, which is the cross platform event that works on Windows.
Thanks to acourbot@ for suggesting the splits in this series.
BUG=b:213147081
TEST=see final CL in series.
Change-Id: I174313cb544c5fc3768810365a42e6eaac1ca91a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3583611
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
base was previously providing some async types which now would
cause a circular dependency. Those have been moved into cros_async.
BUG=b:22320646
TEST=presubmit
Change-Id: I1f526ccfc5882f3a64404f714b13ac92ebfddcd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3533614
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
This change contains the results of running
./tools/contib/cargo_refactor.py
This will break the next uprev, and needs to be synchronizized
with the corresponding ebuild changes in https://crrev.com/c/3248925
BUG=b:195126527
TEST=./tools/run_tests
Change-Id: Ied15a1841887bb8f59fba65b912b81acf69beb73
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3248129
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Dennis Kempin <denniskempin@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
p{read,write} cannot be used on sockets even if the file offset is 0.
Make the file offset optional and fall back to regular read/write when
it is not set.
BUG=none
TEST=cargo test
Change-Id: Iff938aabe613b6164782714cfac94743d64f551a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3033233
Auto-Submit: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Reviewed-by: Noah Gold <nkgold@google.com>
Reviewed-by: Woody Chow <woodychow@google.com>
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
Sometimes users of cros_async need to return an io::Error. Provide a
conversion function to convert the various async errors into an
io::Error. This allows callers to access the underlying error without
forcing us to expose these internal implementation details.
BUG=none
TEST=unit tests
Change-Id: Ie0ab00cb80ea58f628a38c173e28babf30b8d5b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3006308
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
This makes it easier to implement IntoAsync for foreign types.
BUG=none
TEST=Use it in a later change
Change-Id: I070fe3b63ac7458e21fa38b3a1b1bdb318c44d5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2891120
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Noah Gold <nkgold@google.com>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
This CL replaces BorrowedIoVec with VolatileSlice, since VolatileSlice
is a superset of the BorrowedIoVec interface. Also uring_mem -> mem
since that interface will not be exclusively used by uring.
BUG=none
TEST=builds
Change-Id: I33e23483e7afc263c76d71f88736cf38fd5e520e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2724863
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
Rather than requiring callers to wrap the entire UringContext in a big
lock, make UringContext Sync by internally using fine-grained locks:
* The submit queue is wrapped with a Mutex so that threads may still add
operations to the submit queue even when a thread is blocked
inside an io_uring_enter call.
* The completion queue internally uses a Mutex around the pending op
data and completed count so that two threads don't end up trying to
remove the same operation from the completed queue.
With this we can enable the await_uring_from_poll test. This test
uncovered missing wakeups in the case where a uring operation is added
from one thread while the main uring thread is blocked inside an
io_uring_enter syscall. To deal with this, we call submit() whenever the
pending operation is polled and not yet submitted.
BUG=none
TEST=unit tests
Change-Id: I4c7dec65c03b7b10014f4a84d2cd16fe8758ea72
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2643842
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
There are a lot of changes in this one but these are the high-level
points:
* Both executors now support non-fd futures and it's now possible to
start a poll operation on one thread and then await the result inside
a UringExecutor on another thread. The reverse doesn't work yet but
will once we make UringContext sync.
* A few layers of indirection have been removed so hopefully both the
implementation and the interface are simpler.
* The thread local magic is gone in favor of directly calling methods on
an executor. Executor handles can be cheaply cloned to make this
easier.
* Heap allocations are limited to the spawn and spawn_local methods so
it's possible to completely avoid heap allocations if callers only use
the run_until method.
* The IoSource, Executor, FutureList traits are gone.
BUG=none
TEST=unit tests
Cq-Depend: chromium:2629068
Change-Id: I86053007929c36da66f3b2499cdefce0b5e9a180
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2571401
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Noah Gold <nkgold@google.com>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Instead of creating IoSourceExt from AsRawFd implementers, we've
switched to creating from a marker trait `IntoAsync`. This lets us use
other types like RawDescriptor easily with this crate. By using the
marker, we also provide some type safety by requiring consumers of
IoSourceExt to declare that their type is expected to work with async
operations. This way we can provide stronger guarantees that an async
IO trait object will behave in a reasonable way.
This CL also purges the cros_async -> base and io_uring -> base
references, and provides the base types needed to add new async
primitives to base.
BUG=none
TEST=builds
Change-Id: I0b0ce6ca7938b22ae8e8fb4e604439f0292678f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2504481
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
When using uring, we can just call `read_to_vec` rather than having to
call `libc::read`. Unfortunately, PollSource cannot do the same without
hitting an illegal seek (e.g. with eventfds), so we still have to keep
the read_u64 method around.
BUG=None
TEST=`cargo test` in `cros_async`.
Change-Id: I2c61468bec4a3f130c153eccf2875c047c61a2a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2482430
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
This CL makes the following fundamental changes to cros_async:
1. Removes PollOrRing and replaces it with IoSourceExt, and the
subtraits ReadAsync & WriteAsync. The blanket implementation of
IoSourceExt has been dropped, and replaced with source specific
implementations of the trait. Those implementations are where
the code from PollOrRing has been moved.
2. Pinning for IoSource has been dropped from UringSource & the uring
futures. This appears to be safe because the IoSource doesn't contain
any self refs, or perform any operations beyond forwarding to the
RegisteredSource. (The FD is duped before being passed to
RingWakerState by RegisteredSource, so there doesn't seem to be any
data which would require pinning.)
3. U64Source was replaced by EventAsync.
It also switches all Error enums to use thiserror, which reduces
boilerplate.
BUG=None
TEST=cargo test -p cros_async
Cq-Depend: chromium:2421742
Change-Id: Ie1dd958da2e1f8dec1ae1fd8c0b4e754223d330d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2416996
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
The futures don't require the IoSource to be Unpin if they take a
Pin<&I> where I: IoSource.
BUG=none
TEST=unit tests
Change-Id: I6d8e73d54ac612da58004b5bd732640524aac3b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2387822
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
These will be needed by by block.
Note that support for uring fallocate was added in 5.6. The users will
have to handle falling back to synchronous calls if fallocate returns
EINVAL.
BUG=901139
TEST=added fallocate unit tests
Change-Id: I51d635adcf0bb4dd55c5bfe50719f2fde2b88e49
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2274996
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>
Commit-Queue: Dylan Reid <dgreid@chromium.org>
