On Wed, Mar 27, 2024 at 11:05 AM Corey Minyard <minyard@xxxxxxx> wrote: > > On Wed, Mar 27, 2024 at 04:03:11PM +0000, Allen Pais wrote: > > The only generic interface to execute asynchronously in the BH context is > > tasklet; however, it's marked deprecated and has some design flaws. To > > replace tasklets, BH workqueue support was recently added. A BH workqueue > > behaves similarly to regular workqueues except that the queued work items > > are executed in the BH context. > > > > This patch converts drivers/infiniband/* from tasklet to BH workqueue. > > I think you mean drivers/char/ipmi/* here. My apologies, my scripts messed up the commit messages for this series. Will have it fixed in v2. > > I believe that work queues items are execute single-threaded for a work > queue, so this should be good. I need to test this, though. It may be > that an IPMI device can have its own work queue; it may not be important > to run it in bh context. Fair point. Could you please let me know once you have had a chance to test these changes. Meanwhile, I will work on RFC wherein IPMI will have its own workqueue. Thanks for taking time out to review. - Allen > > -corey > > > > > Based on the work done by Tejun Heo <tj@xxxxxxxxxx> > > Branch: https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-6.10 > > > > Signed-off-by: Allen Pais <allen.lkml@xxxxxxxxx> > > --- > > drivers/char/ipmi/ipmi_msghandler.c | 30 ++++++++++++++--------------- > > 1 file changed, 15 insertions(+), 15 deletions(-) > > > > diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c > > index b0eedc4595b3..fce2a2dbdc82 100644 > > --- a/drivers/char/ipmi/ipmi_msghandler.c > > +++ b/drivers/char/ipmi/ipmi_msghandler.c > > @@ -36,12 +36,13 @@ > > #include <linux/nospec.h> > > #include <linux/vmalloc.h> > > #include <linux/delay.h> > > +#include <linux/workqueue.h> > > > > #define IPMI_DRIVER_VERSION "39.2" > > > > static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void); > > static int ipmi_init_msghandler(void); > > -static void smi_recv_tasklet(struct tasklet_struct *t); > > +static void smi_recv_work(struct work_struct *t); > > static void handle_new_recv_msgs(struct ipmi_smi *intf); > > static void need_waiter(struct ipmi_smi *intf); > > static int handle_one_recv_msg(struct ipmi_smi *intf, > > @@ -498,13 +499,13 @@ struct ipmi_smi { > > /* > > * Messages queued for delivery. If delivery fails (out of memory > > * for instance), They will stay in here to be processed later in a > > - * periodic timer interrupt. The tasklet is for handling received > > + * periodic timer interrupt. The work is for handling received > > * messages directly from the handler. > > */ > > spinlock_t waiting_rcv_msgs_lock; > > struct list_head waiting_rcv_msgs; > > atomic_t watchdog_pretimeouts_to_deliver; > > - struct tasklet_struct recv_tasklet; > > + struct work_struct recv_work; > > > > spinlock_t xmit_msgs_lock; > > struct list_head xmit_msgs; > > @@ -704,7 +705,7 @@ static void clean_up_interface_data(struct ipmi_smi *intf) > > struct cmd_rcvr *rcvr, *rcvr2; > > struct list_head list; > > > > - tasklet_kill(&intf->recv_tasklet); > > + cancel_work_sync(&intf->recv_work); > > > > free_smi_msg_list(&intf->waiting_rcv_msgs); > > free_recv_msg_list(&intf->waiting_events); > > @@ -1319,7 +1320,7 @@ static void free_user(struct kref *ref) > > { > > struct ipmi_user *user = container_of(ref, struct ipmi_user, refcount); > > > > - /* SRCU cleanup must happen in task context. */ > > + /* SRCU cleanup must happen in work context. */ > > queue_work(remove_work_wq, &user->remove_work); > > } > > > > @@ -3605,8 +3606,7 @@ int ipmi_add_smi(struct module *owner, > > intf->curr_seq = 0; > > spin_lock_init(&intf->waiting_rcv_msgs_lock); > > INIT_LIST_HEAD(&intf->waiting_rcv_msgs); > > - tasklet_setup(&intf->recv_tasklet, > > - smi_recv_tasklet); > > + INIT_WORK(&intf->recv_work, smi_recv_work); > > atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0); > > spin_lock_init(&intf->xmit_msgs_lock); > > INIT_LIST_HEAD(&intf->xmit_msgs); > > @@ -4779,7 +4779,7 @@ static void handle_new_recv_msgs(struct ipmi_smi *intf) > > * To preserve message order, quit if we > > * can't handle a message. Add the message > > * back at the head, this is safe because this > > - * tasklet is the only thing that pulls the > > + * work is the only thing that pulls the > > * messages. > > */ > > list_add(&smi_msg->link, &intf->waiting_rcv_msgs); > > @@ -4812,10 +4812,10 @@ static void handle_new_recv_msgs(struct ipmi_smi *intf) > > } > > } > > > > -static void smi_recv_tasklet(struct tasklet_struct *t) > > +static void smi_recv_work(struct work_struct *t) > > { > > unsigned long flags = 0; /* keep us warning-free. */ > > - struct ipmi_smi *intf = from_tasklet(intf, t, recv_tasklet); > > + struct ipmi_smi *intf = from_work(intf, t, recv_work); > > int run_to_completion = intf->run_to_completion; > > struct ipmi_smi_msg *newmsg = NULL; > > > > @@ -4866,7 +4866,7 @@ void ipmi_smi_msg_received(struct ipmi_smi *intf, > > > > /* > > * To preserve message order, we keep a queue and deliver from > > - * a tasklet. > > + * a work. > > */ > > if (!run_to_completion) > > spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags); > > @@ -4887,9 +4887,9 @@ void ipmi_smi_msg_received(struct ipmi_smi *intf, > > spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags); > > > > if (run_to_completion) > > - smi_recv_tasklet(&intf->recv_tasklet); > > + smi_recv_work(&intf->recv_work); > > else > > - tasklet_schedule(&intf->recv_tasklet); > > + queue_work(system_bh_wq, &intf->recv_work); > > } > > EXPORT_SYMBOL(ipmi_smi_msg_received); > > > > @@ -4899,7 +4899,7 @@ void ipmi_smi_watchdog_pretimeout(struct ipmi_smi *intf) > > return; > > > > atomic_set(&intf->watchdog_pretimeouts_to_deliver, 1); > > - tasklet_schedule(&intf->recv_tasklet); > > + queue_work(system_bh_wq, &intf->recv_work); > > } > > EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout); > > > > @@ -5068,7 +5068,7 @@ static bool ipmi_timeout_handler(struct ipmi_smi *intf, > > flags); > > } > > > > - tasklet_schedule(&intf->recv_tasklet); > > + queue_work(system_bh_wq, &intf->recv_work); > > > > return need_timer; > > } > > -- > > 2.17.1 > > > > > -- - Allen
