From: Bjorn Helgaas <helgaas@kernel.org> To: Thomas Gleixner <tglx@linutronix.de> Cc: LKML <linux-kernel@vger.kernel.org>, Peter Zijlstra <peterz@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>, Will Deacon <will@kernel.org>, "Paul E . McKenney" <paulmck@kernel.org>, Joel Fernandes <joel@joelfernandes.org>, Steven Rostedt <rostedt@goodmis.org>, Randy Dunlap <rdunlap@infradead.org>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Kurt Schwemmer <kurt.schwemmer@microsemi.com>, Logan Gunthorpe <logang@deltatee.com>, linux-pci@vger.kernel.org, Felipe Balbi <balbi@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-usb@vger.kernel.org, Kalle Valo <kvalo@codeaurora.org>, "David S. Miller" <davem@davemloft.net>, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Oleg Nesterov <oleg@redhat.com>, Davidlohr Bueso <dave@stgolabs.net>, Michael Ellerman <mpe@ellerman.id.au>, Arnd Bergmann <arnd@arndb.de>, linuxppc-dev@lists.ozlabs.org Subject: Re: [patch V2 02/15] pci/switchtec: Replace completion wait queue usage for poll Date: Wed, 18 Mar 2020 16:26:39 -0500 [thread overview] Message-ID: <20200318212639.GA242647@google.com> (raw) In-Reply-To: <20200318204407.607241357@linutronix.de> On Wed, Mar 18, 2020 at 09:43:04PM +0100, Thomas Gleixner wrote: > From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> > > The poll callback is using the completion wait queue and sticks it into > poll_wait() to wake up pollers after a command has completed. > > This works to some extent, but cannot provide EPOLLEXCLUSIVE support > because the waker side uses complete_all() which unconditionally wakes up > all waiters. complete_all() is required because completions internally use > exclusive wait and complete() only wakes up one waiter by default. > > This mixes conceptually different mechanisms and relies on internal > implementation details of completions, which in turn puts contraints on > changing the internal implementation of completions. > > Replace it with a regular wait queue and store the state in struct > switchtec_user. > > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> > Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Cc: Kurt Schwemmer <kurt.schwemmer@microsemi.com> > Cc: Logan Gunthorpe <logang@deltatee.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-pci@vger.kernel.org Acked-by: Bjorn Helgaas <bhelgaas@google.com> But please tweak the subject so it matches the other: - pci/switchtec: Replace completion wait queue usage for poll + PCI/switchtec: Replace completion wait queue usage for poll > --- > V2: Reworded changelog. > --- > drivers/pci/switch/switchtec.c | 22 +++++++++++++--------- > 1 file changed, 13 insertions(+), 9 deletions(-) > > --- a/drivers/pci/switch/switchtec.c > +++ b/drivers/pci/switch/switchtec.c > @@ -52,10 +52,11 @@ struct switchtec_user { > > enum mrpc_state state; > > - struct completion comp; > + wait_queue_head_t cmd_comp; > struct kref kref; > struct list_head list; > > + bool cmd_done; > u32 cmd; > u32 status; > u32 return_code; > @@ -77,7 +78,7 @@ static struct switchtec_user *stuser_cre > stuser->stdev = stdev; > kref_init(&stuser->kref); > INIT_LIST_HEAD(&stuser->list); > - init_completion(&stuser->comp); > + init_waitqueue_head(&stuser->cmd_comp); > stuser->event_cnt = atomic_read(&stdev->event_cnt); > > dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser); > @@ -175,7 +176,7 @@ static int mrpc_queue_cmd(struct switcht > kref_get(&stuser->kref); > stuser->read_len = sizeof(stuser->data); > stuser_set_state(stuser, MRPC_QUEUED); > - reinit_completion(&stuser->comp); > + stuser->cmd_done = false; > list_add_tail(&stuser->list, &stdev->mrpc_queue); > > mrpc_cmd_submit(stdev); > @@ -222,7 +223,8 @@ static void mrpc_complete_cmd(struct swi > memcpy_fromio(stuser->data, &stdev->mmio_mrpc->output_data, > stuser->read_len); > out: > - complete_all(&stuser->comp); > + stuser->cmd_done = true; > + wake_up_interruptible(&stuser->cmd_comp); > list_del_init(&stuser->list); > stuser_put(stuser); > stdev->mrpc_busy = 0; > @@ -529,10 +531,11 @@ static ssize_t switchtec_dev_read(struct > mutex_unlock(&stdev->mrpc_mutex); > > if (filp->f_flags & O_NONBLOCK) { > - if (!try_wait_for_completion(&stuser->comp)) > + if (!stuser->cmd_done) > return -EAGAIN; > } else { > - rc = wait_for_completion_interruptible(&stuser->comp); > + rc = wait_event_interruptible(stuser->cmd_comp, > + stuser->cmd_done); > if (rc < 0) > return rc; > } > @@ -580,7 +583,7 @@ static __poll_t switchtec_dev_poll(struc > struct switchtec_dev *stdev = stuser->stdev; > __poll_t ret = 0; > > - poll_wait(filp, &stuser->comp.wait, wait); > + poll_wait(filp, &stuser->cmd_comp, wait); > poll_wait(filp, &stdev->event_wq, wait); > > if (lock_mutex_and_test_alive(stdev)) > @@ -588,7 +591,7 @@ static __poll_t switchtec_dev_poll(struc > > mutex_unlock(&stdev->mrpc_mutex); > > - if (try_wait_for_completion(&stuser->comp)) > + if (stuser->cmd_done) > ret |= EPOLLIN | EPOLLRDNORM; > > if (stuser->event_cnt != atomic_read(&stdev->event_cnt)) > @@ -1272,7 +1275,8 @@ static void stdev_kill(struct switchtec_ > > /* Wake up and kill any users waiting on an MRPC request */ > list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) { > - complete_all(&stuser->comp); > + stuser->cmd_done = true; > + wake_up_interruptible(&stuser->cmd_comp); > list_del_init(&stuser->list); > stuser_put(stuser); > } >
WARNING: multiple messages have this Message-ID (diff)
From: Bjorn Helgaas <helgaas@kernel.org> To: Thomas Gleixner <tglx@linutronix.de> Cc: Randy Dunlap <rdunlap@infradead.org>, Peter Zijlstra <peterz@infradead.org>, linux-pci@vger.kernel.org, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Oleg Nesterov <oleg@redhat.com>, Joel Fernandes <joel@joelfernandes.org>, Will Deacon <will@kernel.org>, Ingo Molnar <mingo@kernel.org>, Davidlohr Bueso <dave@stgolabs.net>, Arnd Bergmann <arnd@arndb.de>, Logan Gunthorpe <logang@deltatee.com>, "Paul E . McKenney" <paulmck@kernel.org>, linuxppc-dev@lists.ozlabs.org, Steven Rostedt <rostedt@goodmis.org>, Kurt Schwemmer <kurt.schwemmer@microsemi.com>, Kalle Valo <kvalo@codeaurora.org>, Felipe Balbi <balbi@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>, netdev@vger.kernel.org, Linus Torvalds <torvalds@linux-foundation.org>, "David S. Miller" <davem@davemloft.net> Subject: Re: [patch V2 02/15] pci/switchtec: Replace completion wait queue usage for poll Date: Wed, 18 Mar 2020 16:26:39 -0500 [thread overview] Message-ID: <20200318212639.GA242647@google.com> (raw) In-Reply-To: <20200318204407.607241357@linutronix.de> On Wed, Mar 18, 2020 at 09:43:04PM +0100, Thomas Gleixner wrote: > From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> > > The poll callback is using the completion wait queue and sticks it into > poll_wait() to wake up pollers after a command has completed. > > This works to some extent, but cannot provide EPOLLEXCLUSIVE support > because the waker side uses complete_all() which unconditionally wakes up > all waiters. complete_all() is required because completions internally use > exclusive wait and complete() only wakes up one waiter by default. > > This mixes conceptually different mechanisms and relies on internal > implementation details of completions, which in turn puts contraints on > changing the internal implementation of completions. > > Replace it with a regular wait queue and store the state in struct > switchtec_user. > > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> > Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Cc: Kurt Schwemmer <kurt.schwemmer@microsemi.com> > Cc: Logan Gunthorpe <logang@deltatee.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-pci@vger.kernel.org Acked-by: Bjorn Helgaas <bhelgaas@google.com> But please tweak the subject so it matches the other: - pci/switchtec: Replace completion wait queue usage for poll + PCI/switchtec: Replace completion wait queue usage for poll > --- > V2: Reworded changelog. > --- > drivers/pci/switch/switchtec.c | 22 +++++++++++++--------- > 1 file changed, 13 insertions(+), 9 deletions(-) > > --- a/drivers/pci/switch/switchtec.c > +++ b/drivers/pci/switch/switchtec.c > @@ -52,10 +52,11 @@ struct switchtec_user { > > enum mrpc_state state; > > - struct completion comp; > + wait_queue_head_t cmd_comp; > struct kref kref; > struct list_head list; > > + bool cmd_done; > u32 cmd; > u32 status; > u32 return_code; > @@ -77,7 +78,7 @@ static struct switchtec_user *stuser_cre > stuser->stdev = stdev; > kref_init(&stuser->kref); > INIT_LIST_HEAD(&stuser->list); > - init_completion(&stuser->comp); > + init_waitqueue_head(&stuser->cmd_comp); > stuser->event_cnt = atomic_read(&stdev->event_cnt); > > dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser); > @@ -175,7 +176,7 @@ static int mrpc_queue_cmd(struct switcht > kref_get(&stuser->kref); > stuser->read_len = sizeof(stuser->data); > stuser_set_state(stuser, MRPC_QUEUED); > - reinit_completion(&stuser->comp); > + stuser->cmd_done = false; > list_add_tail(&stuser->list, &stdev->mrpc_queue); > > mrpc_cmd_submit(stdev); > @@ -222,7 +223,8 @@ static void mrpc_complete_cmd(struct swi > memcpy_fromio(stuser->data, &stdev->mmio_mrpc->output_data, > stuser->read_len); > out: > - complete_all(&stuser->comp); > + stuser->cmd_done = true; > + wake_up_interruptible(&stuser->cmd_comp); > list_del_init(&stuser->list); > stuser_put(stuser); > stdev->mrpc_busy = 0; > @@ -529,10 +531,11 @@ static ssize_t switchtec_dev_read(struct > mutex_unlock(&stdev->mrpc_mutex); > > if (filp->f_flags & O_NONBLOCK) { > - if (!try_wait_for_completion(&stuser->comp)) > + if (!stuser->cmd_done) > return -EAGAIN; > } else { > - rc = wait_for_completion_interruptible(&stuser->comp); > + rc = wait_event_interruptible(stuser->cmd_comp, > + stuser->cmd_done); > if (rc < 0) > return rc; > } > @@ -580,7 +583,7 @@ static __poll_t switchtec_dev_poll(struc > struct switchtec_dev *stdev = stuser->stdev; > __poll_t ret = 0; > > - poll_wait(filp, &stuser->comp.wait, wait); > + poll_wait(filp, &stuser->cmd_comp, wait); > poll_wait(filp, &stdev->event_wq, wait); > > if (lock_mutex_and_test_alive(stdev)) > @@ -588,7 +591,7 @@ static __poll_t switchtec_dev_poll(struc > > mutex_unlock(&stdev->mrpc_mutex); > > - if (try_wait_for_completion(&stuser->comp)) > + if (stuser->cmd_done) > ret |= EPOLLIN | EPOLLRDNORM; > > if (stuser->event_cnt != atomic_read(&stdev->event_cnt)) > @@ -1272,7 +1275,8 @@ static void stdev_kill(struct switchtec_ > > /* Wake up and kill any users waiting on an MRPC request */ > list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) { > - complete_all(&stuser->comp); > + stuser->cmd_done = true; > + wake_up_interruptible(&stuser->cmd_comp); > list_del_init(&stuser->list); > stuser_put(stuser); > } >
next prev parent reply other threads:[~2020-03-18 21:26 UTC|newest] Thread overview: 148+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-18 20:43 [patch V2 00/15] Lock ordering documentation and annotation for lockdep Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 01/15] PCI/switchtec: Fix init_completion race condition with poll_wait() Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 21:25 ` Bjorn Helgaas 2020-03-18 21:25 ` Bjorn Helgaas 2020-03-18 20:43 ` [patch V2 02/15] pci/switchtec: Replace completion wait queue usage for poll Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 21:26 ` Bjorn Helgaas [this message] 2020-03-18 21:26 ` Bjorn Helgaas 2020-03-18 22:11 ` Logan Gunthorpe 2020-03-18 22:11 ` Logan Gunthorpe 2020-03-18 20:43 ` [patch V2 03/15] usb: gadget: Use completion interface instead of open coding it Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-19 8:41 ` Greg Kroah-Hartman 2020-03-19 8:41 ` Greg Kroah-Hartman 2020-03-18 20:43 ` [patch V2 04/15] orinoco_usb: Use the regular completion interfaces Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-19 8:40 ` Greg Kroah-Hartman 2020-03-19 8:40 ` Greg Kroah-Hartman 2020-03-18 20:43 ` [patch V2 05/15] acpi: Remove header dependency Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 06/15] rcuwait: Add @state argument to rcuwait_wait_event() Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-20 5:36 ` Davidlohr Bueso 2020-03-20 5:36 ` Davidlohr Bueso 2020-03-20 8:45 ` Sebastian Andrzej Siewior 2020-03-20 8:45 ` Sebastian Andrzej Siewior 2020-03-20 8:58 ` Davidlohr Bueso 2020-03-20 8:58 ` Davidlohr Bueso 2020-03-20 9:48 ` [PATCH 0/5] Remove mm.h from arch/*/include/asm/uaccess.h Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 1/5] nds32: Remove mm.h from asm/uaccess.h Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 2/5] csky: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-21 11:24 ` Guo Ren 2020-03-21 11:24 ` Guo Ren 2020-03-21 12:08 ` Thomas Gleixner 2020-03-21 12:08 ` Thomas Gleixner 2020-03-21 14:11 ` Guo Ren 2020-03-21 14:11 ` Guo Ren 2020-03-20 9:48 ` [PATCH 3/5] hexagon: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 4/5] ia64: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 5/5] microblaze: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-18 20:43 ` [patch V2 07/15] powerpc/ps3: Convert half completion to rcuwait Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-19 9:00 ` Sebastian Andrzej Siewior 2020-03-19 9:00 ` Sebastian Andrzej Siewior 2020-03-19 9:18 ` Peter Zijlstra 2020-03-19 9:18 ` Peter Zijlstra 2020-03-19 9:21 ` Davidlohr Bueso 2020-03-19 9:21 ` Davidlohr Bueso 2020-03-19 10:04 ` Christoph Hellwig 2020-03-19 10:04 ` Christoph Hellwig 2020-03-19 10:26 ` Sebastian Andrzej Siewior 2020-03-19 10:26 ` Sebastian Andrzej Siewior 2020-03-20 0:01 ` Geoff Levand 2020-03-20 0:01 ` Geoff Levand 2020-03-20 0:45 ` Michael Ellerman 2020-03-20 0:45 ` Michael Ellerman 2020-03-21 10:41 ` Thomas Gleixner 2020-03-21 10:41 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 08/15] Documentation: Add lock ordering and nesting documentation Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 22:31 ` Paul E. McKenney 2020-03-18 22:31 ` Paul E. McKenney 2020-03-19 18:02 ` Thomas Gleixner 2020-03-19 18:02 ` Thomas Gleixner 2020-03-20 16:01 ` Paul E. McKenney 2020-03-20 16:01 ` Paul E. McKenney 2020-03-20 19:51 ` Thomas Gleixner 2020-03-20 19:51 ` Thomas Gleixner 2020-03-20 21:02 ` Paul E. McKenney 2020-03-20 21:02 ` Paul E. McKenney 2020-03-20 22:36 ` Thomas Gleixner 2020-03-20 22:36 ` Thomas Gleixner 2020-03-21 2:29 ` Paul E. McKenney 2020-03-21 2:29 ` Paul E. McKenney 2020-03-21 10:26 ` Thomas Gleixner 2020-03-21 10:26 ` Thomas Gleixner 2020-03-21 17:23 ` Paul E. McKenney 2020-03-21 17:23 ` Paul E. McKenney 2020-03-19 8:51 ` Davidlohr Bueso 2020-03-19 8:51 ` Davidlohr Bueso 2020-03-19 15:04 ` Jonathan Corbet 2020-03-19 15:04 ` Jonathan Corbet 2020-03-19 18:04 ` Thomas Gleixner 2020-03-19 18:04 ` Thomas Gleixner 2020-03-21 21:21 ` Joel Fernandes 2020-03-21 21:21 ` Joel Fernandes 2020-03-21 21:49 ` Thomas Gleixner 2020-03-21 21:49 ` Thomas Gleixner 2020-03-22 1:36 ` Joel Fernandes 2020-03-22 1:36 ` Joel Fernandes 2020-03-18 20:43 ` [patch V2 09/15] timekeeping: Split jiffies seqlock Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 10/15] sched/swait: Prepare usage in completions Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 11/15] completion: Use simple wait queues Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 22:28 ` Logan Gunthorpe 2020-03-18 22:28 ` Logan Gunthorpe 2020-03-19 0:33 ` Joel Fernandes 2020-03-19 0:33 ` Joel Fernandes 2020-03-19 0:44 ` Thomas Gleixner 2020-03-19 0:44 ` Thomas Gleixner 2020-03-19 8:42 ` Greg Kroah-Hartman 2020-03-19 8:42 ` Greg Kroah-Hartman 2020-03-19 17:12 ` Linus Torvalds 2020-03-19 17:12 ` Linus Torvalds 2020-03-19 23:25 ` Julian Calaby 2020-03-19 23:25 ` Julian Calaby 2020-03-20 6:59 ` Christoph Hellwig 2020-03-20 6:59 ` Christoph Hellwig 2020-03-20 9:01 ` Davidlohr Bueso 2020-03-20 9:01 ` Davidlohr Bueso 2020-03-18 20:43 ` [patch V2 13/15] lockdep: Add hrtimer context tracing bits Thomas Gleixner 2020-03-18 20:43 ` [patch V2 14/15] lockdep: Annotate irq_work Thomas Gleixner 2020-03-18 20:43 ` [patch V2 15/15] lockdep: Add posixtimer context tracing bits Thomas Gleixner 2020-03-20 8:50 ` [patch V2 00/15] Lock ordering documentation and annotation for lockdep Davidlohr Bueso 2020-03-20 8:50 ` Davidlohr Bueso 2020-03-20 8:55 ` [PATCH 16/15] rcuwait: Get rid of stale name comment Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso 2020-03-20 8:55 ` [PATCH 17/15] rcuwait: Inform rcuwait_wake_up() users if a wakeup was attempted Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso 2020-03-20 9:13 ` Sebastian Andrzej Siewior 2020-03-20 9:13 ` Sebastian Andrzej Siewior 2020-03-20 10:44 ` Peter Zijlstra 2020-03-20 10:44 ` Peter Zijlstra 2020-03-20 8:55 ` [PATCH 18/15] kvm: Replace vcpu->swait with rcuwait Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso 2020-03-20 11:20 ` Paolo Bonzini 2020-03-20 11:20 ` Paolo Bonzini 2020-03-20 12:54 ` Peter Zijlstra 2020-03-20 12:54 ` Peter Zijlstra 2020-03-22 16:33 ` Davidlohr Bueso 2020-03-22 16:33 ` Davidlohr Bueso 2020-03-22 22:32 ` Peter Zijlstra 2020-03-22 22:32 ` Peter Zijlstra 2020-03-20 8:55 ` [PATCH 19/15] sched/swait: Reword some of the main description Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso 2020-03-20 9:19 ` Sebastian Andrzej Siewior 2020-03-20 9:19 ` Sebastian Andrzej Siewior
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