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author | Jason Gunthorpe <jgg@mellanox.com> | 2019-01-29 13:49:31 -0700 |
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committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-01-29 13:49:31 -0700 |
commit | 55c293c38efa4408920e3ff8135a85a0dc2e3f56 (patch) | |
tree | 7933e8bd5f163545eaa497c5b659052a6edf30e1 /drivers/reset/core.c | |
parent | infiniband: prefix header search paths with $(srctree)/ (diff) | |
parent | IB/mlx5: Implement DEVX hot unplug for async command FD (diff) | |
download | linux-dev-55c293c38efa4408920e3ff8135a85a0dc2e3f56.tar.xz linux-dev-55c293c38efa4408920e3ff8135a85a0dc2e3f56.zip |
Merge branch 'devx-async' into k.o/for-next
Yishai Hadas says:
Enable DEVX asynchronous query commands
This series enables querying a DEVX object in an asynchronous mode.
The userspace application won't block when calling the firmware and it will be
able to get the response back once that it will be ready.
To enable the above functionality:
- DEVX asynchronous command completion FD object was introduced.
- The applicable file operations were implemented to enable using it by
the user application.
- Query asynchronous method was added to the DEVX object, it will call the
firmware asynchronously and manages the response on the given input FD.
- Hot unplug support was added for the FD to work properly upon
unbind/disassociate.
- mlx5 core fence for asynchronous commands was implemented and used to
prevent racing upon unbind/disassociate.
This branch is based on mlx5-next & v5.0-rc2 due to dependencies, from
git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux
* branch 'devx-async':
IB/mlx5: Implement DEVX hot unplug for async command FD
IB/mlx5: Implement the file ops of DEVX async command FD
IB/mlx5: Introduce async DEVX obj query API
IB/mlx5: Introduce MLX5_IB_OBJECT_DEVX_ASYNC_CMD_FD
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/reset/core.c')
-rw-r--r-- | drivers/reset/core.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/reset/core.c b/drivers/reset/core.c index d1887c0ed5d3..9582efb70025 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -795,3 +795,45 @@ devm_reset_control_array_get(struct device *dev, bool shared, bool optional) return rstc; } EXPORT_SYMBOL_GPL(devm_reset_control_array_get); + +static int reset_control_get_count_from_lookup(struct device *dev) +{ + const struct reset_control_lookup *lookup; + const char *dev_id; + int count = 0; + + if (!dev) + return -EINVAL; + + dev_id = dev_name(dev); + mutex_lock(&reset_lookup_mutex); + + list_for_each_entry(lookup, &reset_lookup_list, list) { + if (!strcmp(lookup->dev_id, dev_id)) + count++; + } + + mutex_unlock(&reset_lookup_mutex); + + if (count == 0) + count = -ENOENT; + + return count; +} + +/** + * reset_control_get_count - Count number of resets available with a device + * + * @dev: device for which to return the number of resets + * + * Returns positive reset count on success, or error number on failure and + * on count being zero. + */ +int reset_control_get_count(struct device *dev) +{ + if (dev->of_node) + return of_reset_control_get_count(dev->of_node); + + return reset_control_get_count_from_lookup(dev); +} +EXPORT_SYMBOL_GPL(reset_control_get_count); |