The following commit has been merged into the sched/core branch of tip:
Commit-ID: 9d42ea0d6984044a82258f41d8407ee442687f30
Gitweb: https://git.kernel.org/tip/9d42ea0d6984044a82258f41d8407ee442687f30
Author: Frederic Weisbecker <frederic@xxxxxxxxxx>
AuthorDate: Mon, 07 Feb 2022 16:59:03 +01:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 16 Feb 2022 15:57:54 +01:00
pci: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch
To prepare for supporting each feature of the housekeeping cpumask
toward cpuset, prepare each of the HK_FLAG_* entries to move to their
own cpumask with enforcing to fetch them individually. The new
constraint is that multiple HK_FLAG_* entries can't be mixed together
anymore in a single call to housekeeping cpumask().
This will later allow, for example, to runtime modify the cpulist passed
through "isolcpus=", "nohz_full=" and "rcu_nocbs=" kernel boot
parameters.
Signed-off-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Reviewed-by: Phil Auld <pauld@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220207155910.527133-2-frederic@xxxxxxxxxx
---
drivers/pci/pci-driver.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 588588c..4a5792c 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -350,7 +350,6 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
const struct pci_device_id *id)
{
int error, node, cpu;
- int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
struct drv_dev_and_id ddi = { drv, dev, id };
/*
@@ -368,17 +367,29 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
* device is probed from work_on_cpu() of the Physical device.
*/
if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
- pci_physfn_is_probed(dev))
+ pci_physfn_is_probed(dev)) {
cpu = nr_cpu_ids;
- else
+ } else {
+ cpumask_var_t wq_domain_mask;
+
+ if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) {
+ error = -ENOMEM;
+ goto out;
+ }
+ cpumask_and(wq_domain_mask,
+ housekeeping_cpumask(HK_FLAG_WQ),
+ housekeeping_cpumask(HK_FLAG_DOMAIN));
+
cpu = cpumask_any_and(cpumask_of_node(node),
- housekeeping_cpumask(hk_flags));
+ wq_domain_mask);
+ free_cpumask_var(wq_domain_mask);
+ }
if (cpu < nr_cpu_ids)
error = work_on_cpu(cpu, local_pci_probe, &ddi);
else
error = local_pci_probe(&ddi);
-
+out:
dev->is_probed = 0;
cpu_hotplug_enable();
return error;
|