From: Anchal Agarwal <anchalag@amazon.com> To: <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>, <hpa@zytor.com>, <x86@kernel.org>, <boris.ostrovsky@oracle.com>, <jgross@suse.com>, <linux-pm@vger.kernel.org>, <linux-mm@kvack.org>, <kamatam@amazon.com>, <sstabellini@kernel.org>, <konrad.wilk@oracle.co>, <roger.pau@citrix.com>, <axboe@kernel.dk>, <davem@davemloft.net>, <rjw@rjwysocki.net>, <len.brown@intel.com>, <pavel@ucw.cz>, <peterz@infradead.org>, <eduval@amazon.com>, <sblbir@amazon.com>, <anchalag@amazon.com>, <xen-devel@lists.xenproject.org>, <vkuznets@redhat.com>, <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <Woodhouse@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com>, <dwmw@amazon.co.uk>, <fllinden@amaozn.com> Cc: <anchalag@amazon.com> Subject: [RFC PATCH V2 09/11] xen: Clear IRQD_IRQ_STARTED flag during shutdown PIRQs Date: Tue, 7 Jan 2020 23:44:20 +0000 [thread overview] Message-ID: <20200107234420.GA18738@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> (raw) shutdown_pirq is invoked during hibernation path and hence PIRQs should be restarted during resume. Before this commit'020db9d3c1dc0a' xen/events: Fix interrupt lost during irq_disable and irq_enable startup_pirq was automatically called during irq_enable however, after this commit pirq's did not get explicitly started once resumed from hibernation. chip->irq_startup is called only if IRQD_IRQ_STARTED is unset during irq_startup on resume. This flag gets cleared by free_irq->irq_shutdown during suspend. free_irq() never gets explicitly called for ioapic-edge and ioapic-level interrupts as respective drivers do nothing during suspend/resume. So we shut them down explicitly in the first place in syscore_suspend path to clear IRQ<>event channel mapping. shutdown_pirq being called explicitly during suspend does not clear this flags, hence .irq_enable is called in irq_startup during resume instead and pirq's never start up. Signed-off-by: Anchal Agarwal <anchalag@amazon.com> --- drivers/xen/events/events_base.c | 1 + include/linux/irq.h | 1 + kernel/irq/chip.c | 3 ++- 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index b893536d8af4..aae7c4997b51 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1606,6 +1606,7 @@ void xen_shutdown_pirqs(void) continue; shutdown_pirq(irq_get_irq_data(info->irq)); + irq_state_clr_started(irq_to_desc(info->irq)); } } diff --git a/include/linux/irq.h b/include/linux/irq.h index fb301cf29148..1e125cd22cf0 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -745,6 +745,7 @@ extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry); extern int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset, struct msi_desc *entry); extern struct irq_data *irq_get_irq_data(unsigned int irq); +extern void irq_state_clr_started(struct irq_desc *desc); static inline struct irq_chip *irq_get_chip(unsigned int irq) { diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index b76703b2c0af..3e8a36c673d6 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -173,10 +173,11 @@ static void irq_state_clr_masked(struct irq_desc *desc) irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED); } -static void irq_state_clr_started(struct irq_desc *desc) +void irq_state_clr_started(struct irq_desc *desc) { irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED); } +EXPORT_SYMBOL_GPL(irq_state_clr_started); static void irq_state_set_started(struct irq_desc *desc) { -- 2.15.3.AMZN
WARNING: multiple messages have this Message-ID (diff)
From: Anchal Agarwal <anchalag@amazon.com> To: <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>, <hpa@zytor.com>, <x86@kernel.org>, <boris.ostrovsky@oracle.com>, <jgross@suse.com>, <linux-pm@vger.kernel.org>, <linux-mm@kvack.org>, <kamatam@amazon.com>, <sstabellini@kernel.org>, <konrad.wilk@oracle.co>, <roger.pau@citrix.com>, <axboe@kernel.dk>, <davem@davemloft.net>, <rjw@rjwysocki.net>, <len.brown@intel.com>, <pavel@ucw.cz>, <peterz@infradead.org>, <eduval@amazon.com>, <sblbir@amazon.com>, <anchalag@amazon.com>, <xen-devel@lists.xenproject.org>, <vkuznets@redhat.com>, <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <Woodhouse@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com>, <dwmw@amazon.co.uk>, <fllinden@amaozn.com> Cc: anchalag@amazon.com Subject: [Xen-devel] [RFC PATCH V2 09/11] xen: Clear IRQD_IRQ_STARTED flag during shutdown PIRQs Date: Tue, 7 Jan 2020 23:44:20 +0000 [thread overview] Message-ID: <20200107234420.GA18738@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> (raw) shutdown_pirq is invoked during hibernation path and hence PIRQs should be restarted during resume. Before this commit'020db9d3c1dc0a' xen/events: Fix interrupt lost during irq_disable and irq_enable startup_pirq was automatically called during irq_enable however, after this commit pirq's did not get explicitly started once resumed from hibernation. chip->irq_startup is called only if IRQD_IRQ_STARTED is unset during irq_startup on resume. This flag gets cleared by free_irq->irq_shutdown during suspend. free_irq() never gets explicitly called for ioapic-edge and ioapic-level interrupts as respective drivers do nothing during suspend/resume. So we shut them down explicitly in the first place in syscore_suspend path to clear IRQ<>event channel mapping. shutdown_pirq being called explicitly during suspend does not clear this flags, hence .irq_enable is called in irq_startup during resume instead and pirq's never start up. Signed-off-by: Anchal Agarwal <anchalag@amazon.com> --- drivers/xen/events/events_base.c | 1 + include/linux/irq.h | 1 + kernel/irq/chip.c | 3 ++- 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index b893536d8af4..aae7c4997b51 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1606,6 +1606,7 @@ void xen_shutdown_pirqs(void) continue; shutdown_pirq(irq_get_irq_data(info->irq)); + irq_state_clr_started(irq_to_desc(info->irq)); } } diff --git a/include/linux/irq.h b/include/linux/irq.h index fb301cf29148..1e125cd22cf0 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -745,6 +745,7 @@ extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry); extern int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset, struct msi_desc *entry); extern struct irq_data *irq_get_irq_data(unsigned int irq); +extern void irq_state_clr_started(struct irq_desc *desc); static inline struct irq_chip *irq_get_chip(unsigned int irq) { diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index b76703b2c0af..3e8a36c673d6 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -173,10 +173,11 @@ static void irq_state_clr_masked(struct irq_desc *desc) irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED); } -static void irq_state_clr_started(struct irq_desc *desc) +void irq_state_clr_started(struct irq_desc *desc) { irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED); } +EXPORT_SYMBOL_GPL(irq_state_clr_started); static void irq_state_set_started(struct irq_desc *desc) { -- 2.15.3.AMZN _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
next reply other threads:[~2020-01-07 23:44 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-01-07 23:44 Anchal Agarwal [this message] 2020-01-07 23:44 ` [Xen-devel] [RFC PATCH V2 09/11] xen: Clear IRQD_IRQ_STARTED flag during shutdown PIRQs Anchal Agarwal 2020-01-08 15:23 ` Thomas Gleixner 2020-01-08 15:23 ` [Xen-devel] " Thomas Gleixner 2020-01-08 21:24 ` Anchal Agarwal 2020-01-08 21:24 ` [Xen-devel] " Anchal Agarwal 2020-01-09 12:07 ` Thomas Gleixner 2020-01-09 12:07 ` [Xen-devel] " Thomas Gleixner 2020-01-09 23:40 ` Anchal Agarwal 2020-01-09 23:40 ` [Xen-devel] " Anchal Agarwal 2020-01-10 19:13 ` Thomas Gleixner 2020-01-10 19:13 ` [Xen-devel] " Thomas Gleixner 2020-01-10 22:57 ` Anchal Agarwal 2020-01-10 22:57 ` [Xen-devel] " Anchal Agarwal
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