Merge tag 'driver-core-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the big driver core patchset for 5.1-rc1

  More patches than "normal" here this merge window, due to some work in
  the driver core by Alexander Duyck to rework the async probe
  functionality to work better for a number of devices, and independant
  work from Rafael for the device link functionality to make it work
  "correctly".

  Also in here is:

   - lots of BUS_ATTR() removals, the macro is about to go away

   - firmware test fixups

   - ihex fixups and simplification

   - component additions (also includes i915 patches)

   - lots of minor coding style fixups and cleanups.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (65 commits)
  driver core: platform: remove misleading err_alloc label
  platform: set of_node in platform_device_register_full()
  firmware: hardcode the debug message for -ENOENT
  driver core: Add missing description of new struct device_link field
  driver core: Fix PM-runtime for links added during consumer probe
  drivers/component: kerneldoc polish
  async: Add cmdline option to specify drivers to be async probed
  driver core: Fix possible supplier PM-usage counter imbalance
  PM-runtime: Fix __pm_runtime_set_status() race with runtime resume
  driver: platform: Support parsing GpioInt 0 in platform_get_irq()
  selftests: firmware: fix verify_reqs() return value
  Revert "selftests: firmware: remove use of non-standard diff -Z option"
  Revert "selftests: firmware: add CONFIG_FW_LOADER_USER_HELPER_FALLBACK to config"
  device: Fix comment for driver_data in struct device
  kernfs: Allocating memory for kernfs_iattrs with kmem_cache.
  sysfs: remove unused include of kernfs-internal.h
  driver core: Postpone DMA tear-down until after devres release
  driver core: Document limitation related to DL_FLAG_RPM_ACTIVE
  PM-runtime: Take suppliers into account in __pm_runtime_set_status()
  device.h: Add __cold to dev_<level> logging functions
  ...

1 files changed, 84 insertions, 0 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e163e7a7f5e5..56814902bc56 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1514,6 +1514,90 @@ bool queue_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL(queue_work_on);
 
+/**
+ * workqueue_select_cpu_near - Select a CPU based on NUMA node
+ * @node: NUMA node ID that we want to select a CPU from
+ *
+ * This function will attempt to find a "random" cpu available on a given
+ * node. If there are no CPUs available on the given node it will return
+ * WORK_CPU_UNBOUND indicating that we should just schedule to any
+ * available CPU if we need to schedule this work.
+ */
+static int workqueue_select_cpu_near(int node)
+{
+        int cpu;
+
+        /* No point in doing this if NUMA isn't enabled for workqueues */
+        if (!wq_numa_enabled)
+                return WORK_CPU_UNBOUND;
+
+        /* Delay binding to CPU if node is not valid or online */
+        if (node < 0 || node >= MAX_NUMNODES || !node_online(node))
+                return WORK_CPU_UNBOUND;
+
+        /* Use local node/cpu if we are already there */
+        cpu = raw_smp_processor_id();
+        if (node == cpu_to_node(cpu))
+                return cpu;
+
+        /* Use "random" otherwise know as "first" online CPU of node */
+        cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
+
+        /* If CPU is valid return that, otherwise just defer */
+        return cpu < nr_cpu_ids ? cpu : WORK_CPU_UNBOUND;
+}
+
+/**
+ * queue_work_node - queue work on a "random" cpu for a given NUMA node
+ * @node: NUMA node that we are targeting the work for
+ * @wq: workqueue to use
+ * @work: work to queue
+ *
+ * We queue the work to a "random" CPU within a given NUMA node. The basic
+ * idea here is to provide a way to somehow associate work with a given
+ * NUMA node.
+ *
+ * This function will only make a best effort attempt at getting this onto
+ * the right NUMA node. If no node is requested or the requested node is
+ * offline then we just fall back to standard queue_work behavior.
+ *
+ * Currently the "random" CPU ends up being the first available CPU in the
+ * intersection of cpu_online_mask and the cpumask of the node, unless we
+ * are running on the node. In that case we just use the current CPU.
+ *
+ * Return: %false if @work was already on a queue, %true otherwise.
+ */
+bool queue_work_node(int node, struct workqueue_struct *wq,
+                     struct work_struct *work)
+{
+        unsigned long flags;
+        bool ret = false;
+
+        /*
+         * This current implementation is specific to unbound workqueues.
+         * Specifically we only return the first available CPU for a given
+         * node instead of cycling through individual CPUs within the node.
+         *
+         * If this is used with a per-cpu workqueue then the logic in
+         * workqueue_select_cpu_near would need to be updated to allow for
+         * some round robin type logic.
+         */
+        WARN_ON_ONCE(!(wq->flags & WQ_UNBOUND));
+
+        local_irq_save(flags);
+
+        if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
+                int cpu = workqueue_select_cpu_near(node);
+
+                __queue_work(cpu, wq, work);
+                ret = true;
+        }
+
+        local_irq_restore(flags);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(queue_work_node);
+
 void delayed_work_timer_fn(struct timer_list *t)
 {
         struct delayed_work *dwork = from_timer(dwork, t, timer);