From 7bbf1dd24b17b9ec4f47c43ce4e05bf190745553 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 1 Jun 2015 16:05:10 +0800 Subject: genirq: Enhance irq_data_to_desc() to support hierarchy irqdomain For irq associated with hierarchy irqdomains, there will be multiple irq_datas for one irq_desc. So enhance irq_data_to_desc() to support hierarchy irqdomain. Also export irq_data_to_desc() as an inline function for later reuse. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Bjorn Helgaas Cc: Benjamin Herrenschmidt Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Cc: Marc Zyngier Link: http://lkml.kernel.org/r/1433145945-789-2-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- kernel/irq/internals.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'kernel') diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index df553b0af936..b93d434e70bd 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -59,8 +59,6 @@ enum { #include "debug.h" #include "settings.h" -#define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data) - extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, unsigned long flags); extern void __disable_irq(struct irq_desc *desc, unsigned int irq); -- cgit v1.2.3-58-ga151 From 77ed42f18edd486e9994ccd1f174076309a6343f Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 1 Jun 2015 16:05:11 +0800 Subject: genirq: Prevent crash in irq_move_irq() The functions irq_move_irq() and irq_move_masked_irq() expect that the caller passes the top-level irq_data to them when hierarchical irqdomains are enabled. But that's not true when called from apic_ack_edge(), which results in a null pointer dereference by idata->chip->irq_mask(idata). Instead of fixing callers to passing top-level irq_data, we rather change irq_move_irq()/irq_move_masked_irq() to accept any irq_data. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Bjorn Helgaas Cc: Benjamin Herrenschmidt Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Link: http://lkml.kernel.org/r/1433145945-789-3-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- kernel/irq/migration.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c index ca3f4aaff707..dd203e276b07 100644 --- a/kernel/irq/migration.c +++ b/kernel/irq/migration.c @@ -7,7 +7,7 @@ void irq_move_masked_irq(struct irq_data *idata) { struct irq_desc *desc = irq_data_to_desc(idata); - struct irq_chip *chip = idata->chip; + struct irq_chip *chip = desc->irq_data.chip; if (likely(!irqd_is_setaffinity_pending(&desc->irq_data))) return; @@ -52,6 +52,13 @@ void irq_move_irq(struct irq_data *idata) { bool masked; + /* + * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled, + * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is + * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here. + */ + idata = irq_desc_get_irq_data(irq_data_to_desc(idata)); + if (likely(!irqd_is_setaffinity_pending(idata))) return; -- cgit v1.2.3-58-ga151 From 0d0b4c866bcce647f40d73efe5e90aeeb079050a Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 1 Jun 2015 16:05:12 +0800 Subject: genirq: Introduce struct irq_common_data to host shared irq data With the introduction of hierarchy irqdomain, struct irq_data becomes per-chip instead of per-irq and there may be multiple irq_datas associated with the same irq. Some per-irq data stored in struct irq_data now may get duplicated into multiple irq_datas, and causes inconsistent view. So introduce struct irq_common_data to host per-irq common data and to achieve consistent view among irq_chips. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Bjorn Helgaas Cc: Benjamin Herrenschmidt Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Cc: Jason Cooper Cc: Kevin Cernekee Cc: Arnd Bergmann Cc: Marc Zyngier Link: http://lkml.kernel.org/r/1433145945-789-4-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- include/linux/irq.h | 54 +++++++++++++++++++++++++++++-------------------- include/linux/irqdesc.h | 3 ++- kernel/irq/internals.h | 10 ++++----- kernel/irq/irqdesc.c | 1 + kernel/irq/irqdomain.c | 1 + 5 files changed, 41 insertions(+), 28 deletions(-) (limited to 'kernel') diff --git a/include/linux/irq.h b/include/linux/irq.h index 48cb7d1aa58f..3c7fbe44edae 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -126,13 +126,21 @@ struct msi_desc; struct irq_domain; /** - * struct irq_data - per irq and irq chip data passed down to chip functions + * struct irq_common_data - per irq data shared by all irqchips + * @state_use_accessors: status information for irq chip functions. + * Use accessor functions to deal with it + */ +struct irq_common_data { + unsigned int state_use_accessors; +}; + +/** + * struct irq_data - per irq chip data passed down to chip functions * @mask: precomputed bitmask for accessing the chip registers * @irq: interrupt number * @hwirq: hardware interrupt number, local to the interrupt domain * @node: node index useful for balancing - * @state_use_accessors: status information for irq chip functions. - * Use accessor functions to deal with it + * @common: point to data shared by all irqchips * @chip: low level interrupt hardware access * @domain: Interrupt translation domain; responsible for mapping * between hwirq number and linux irq number. @@ -153,7 +161,7 @@ struct irq_data { unsigned int irq; unsigned long hwirq; unsigned int node; - unsigned int state_use_accessors; + struct irq_common_data *common; struct irq_chip *chip; struct irq_domain *domain; #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY @@ -166,7 +174,7 @@ struct irq_data { }; /* - * Bit masks for irq_data.state + * Bit masks for irq_common_data.state_use_accessors * * IRQD_TRIGGER_MASK - Mask for the trigger type bits * IRQD_SETAFFINITY_PENDING - Affinity setting is pending @@ -198,34 +206,36 @@ enum { IRQD_WAKEUP_ARMED = (1 << 19), }; +#define __irqd_to_state(d) ((d)->common->state_use_accessors) + static inline bool irqd_is_setaffinity_pending(struct irq_data *d) { - return d->state_use_accessors & IRQD_SETAFFINITY_PENDING; + return __irqd_to_state(d) & IRQD_SETAFFINITY_PENDING; } static inline bool irqd_is_per_cpu(struct irq_data *d) { - return d->state_use_accessors & IRQD_PER_CPU; + return __irqd_to_state(d) & IRQD_PER_CPU; } static inline bool irqd_can_balance(struct irq_data *d) { - return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING)); + return !(__irqd_to_state(d) & (IRQD_PER_CPU | IRQD_NO_BALANCING)); } static inline bool irqd_affinity_was_set(struct irq_data *d) { - return d->state_use_accessors & IRQD_AFFINITY_SET; + return __irqd_to_state(d) & IRQD_AFFINITY_SET; } static inline void irqd_mark_affinity_was_set(struct irq_data *d) { - d->state_use_accessors |= IRQD_AFFINITY_SET; + __irqd_to_state(d) |= IRQD_AFFINITY_SET; } static inline u32 irqd_get_trigger_type(struct irq_data *d) { - return d->state_use_accessors & IRQD_TRIGGER_MASK; + return __irqd_to_state(d) & IRQD_TRIGGER_MASK; } /* @@ -233,43 +243,43 @@ static inline u32 irqd_get_trigger_type(struct irq_data *d) */ static inline void irqd_set_trigger_type(struct irq_data *d, u32 type) { - d->state_use_accessors &= ~IRQD_TRIGGER_MASK; - d->state_use_accessors |= type & IRQD_TRIGGER_MASK; + __irqd_to_state(d) &= ~IRQD_TRIGGER_MASK; + __irqd_to_state(d) |= type & IRQD_TRIGGER_MASK; } static inline bool irqd_is_level_type(struct irq_data *d) { - return d->state_use_accessors & IRQD_LEVEL; + return __irqd_to_state(d) & IRQD_LEVEL; } static inline bool irqd_is_wakeup_set(struct irq_data *d) { - return d->state_use_accessors & IRQD_WAKEUP_STATE; + return __irqd_to_state(d) & IRQD_WAKEUP_STATE; } static inline bool irqd_can_move_in_process_context(struct irq_data *d) { - return d->state_use_accessors & IRQD_MOVE_PCNTXT; + return __irqd_to_state(d) & IRQD_MOVE_PCNTXT; } static inline bool irqd_irq_disabled(struct irq_data *d) { - return d->state_use_accessors & IRQD_IRQ_DISABLED; + return __irqd_to_state(d) & IRQD_IRQ_DISABLED; } static inline bool irqd_irq_masked(struct irq_data *d) { - return d->state_use_accessors & IRQD_IRQ_MASKED; + return __irqd_to_state(d) & IRQD_IRQ_MASKED; } static inline bool irqd_irq_inprogress(struct irq_data *d) { - return d->state_use_accessors & IRQD_IRQ_INPROGRESS; + return __irqd_to_state(d) & IRQD_IRQ_INPROGRESS; } static inline bool irqd_is_wakeup_armed(struct irq_data *d) { - return d->state_use_accessors & IRQD_WAKEUP_ARMED; + return __irqd_to_state(d) & IRQD_WAKEUP_ARMED; } @@ -280,12 +290,12 @@ static inline bool irqd_is_wakeup_armed(struct irq_data *d) */ static inline void irqd_set_chained_irq_inprogress(struct irq_data *d) { - d->state_use_accessors |= IRQD_IRQ_INPROGRESS; + __irqd_to_state(d) |= IRQD_IRQ_INPROGRESS; } static inline void irqd_clr_chained_irq_inprogress(struct irq_data *d) { - d->state_use_accessors &= ~IRQD_IRQ_INPROGRESS; + __irqd_to_state(d) &= ~IRQD_IRQ_INPROGRESS; } static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d) diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h index a113a8dc7438..c52d1480f272 100644 --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -17,7 +17,7 @@ struct pt_regs; /** * struct irq_desc - interrupt descriptor - * @irq_data: per irq and chip data passed down to chip functions + * @irq_common_data: per irq and chip data passed down to chip functions * @kstat_irqs: irq stats per cpu * @handle_irq: highlevel irq-events handler * @preflow_handler: handler called before the flow handler (currently used by sparc) @@ -47,6 +47,7 @@ struct pt_regs; * @name: flow handler name for /proc/interrupts output */ struct irq_desc { + struct irq_common_data irq_common_data; struct irq_data irq_data; unsigned int __percpu *kstat_irqs; irq_flow_handler_t handle_irq; diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index b93d434e70bd..a1ed80d11800 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -168,27 +168,27 @@ irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) */ static inline void irqd_set_move_pending(struct irq_data *d) { - d->state_use_accessors |= IRQD_SETAFFINITY_PENDING; + __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; } static inline void irqd_clr_move_pending(struct irq_data *d) { - d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING; + __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; } static inline void irqd_clear(struct irq_data *d, unsigned int mask) { - d->state_use_accessors &= ~mask; + __irqd_to_state(d) &= ~mask; } static inline void irqd_set(struct irq_data *d, unsigned int mask) { - d->state_use_accessors |= mask; + __irqd_to_state(d) |= mask; } static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) { - return d->state_use_accessors & mask; + return __irqd_to_state(d) & mask; } static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc) diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 99793b9b6d23..eac1aac906ea 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -76,6 +76,7 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node, { int cpu; + desc->irq_data.common = &desc->irq_common_data; desc->irq_data.irq = irq; desc->irq_data.chip = &no_irq_chip; desc->irq_data.chip_data = NULL; diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 7fac311057b8..3552b8750efd 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -834,6 +834,7 @@ static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain, if (irq_data) { child->parent_data = irq_data; irq_data->irq = child->irq; + irq_data->common = child->common; irq_data->node = child->node; irq_data->domain = domain; } -- cgit v1.2.3-58-ga151 From 6783011b48096b9a0c239d0f7645f93070b6eefd Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 1 Jun 2015 16:05:13 +0800 Subject: genirq: Introduce helper function irq_data_get_node() Introduce helper function irq_data_get_node() and variants thereof to hide struct irq_data implementation details. Convert the core code to use them. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Bjorn Helgaas Cc: Benjamin Herrenschmidt Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Cc: Jason Cooper Cc: Kevin Cernekee Cc: Arnd Bergmann Link: http://lkml.kernel.org/r/1433145945-789-5-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- include/linux/irq.h | 5 +++++ kernel/irq/internals.h | 5 +++++ kernel/irq/irqdesc.c | 8 +------- kernel/irq/irqdomain.c | 3 ++- kernel/irq/manage.c | 2 +- kernel/irq/proc.c | 2 +- 6 files changed, 15 insertions(+), 10 deletions(-) (limited to 'kernel') diff --git a/include/linux/irq.h b/include/linux/irq.h index 3c7fbe44edae..b3b82a5344c8 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -640,6 +640,11 @@ static inline u32 irq_get_trigger_type(unsigned int irq) return d ? irqd_get_trigger_type(d) : 0; } +static inline int irq_data_get_node(struct irq_data *d) +{ + return d->node; +} + unsigned int arch_dynirq_lower_bound(unsigned int from); int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node, diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index a1ed80d11800..4834ee828c41 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -197,6 +197,11 @@ static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *d __this_cpu_inc(kstat.irqs_sum); } +static inline int irq_desc_get_node(struct irq_desc *desc) +{ + return irq_data_get_node(&desc->irq_data); +} + #ifdef CONFIG_PM_SLEEP bool irq_pm_check_wakeup(struct irq_desc *desc); void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index eac1aac906ea..b18d3f1d73d9 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -59,16 +59,10 @@ static void desc_smp_init(struct irq_desc *desc, int node) #endif } -static inline int desc_node(struct irq_desc *desc) -{ - return desc->irq_data.node; -} - #else static inline int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; } static inline void desc_smp_init(struct irq_desc *desc, int node) { } -static inline int desc_node(struct irq_desc *desc) { return 0; } #endif static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node, @@ -300,7 +294,7 @@ static void free_desc(unsigned int irq) unsigned long flags; raw_spin_lock_irqsave(&desc->lock, flags); - desc_set_defaults(irq, desc, desc_node(desc), NULL); + desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL); raw_spin_unlock_irqrestore(&desc->lock, flags); } diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 3552b8750efd..1b06dfed4574 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -830,7 +830,8 @@ static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain, { struct irq_data *irq_data; - irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL, child->node); + irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL, + irq_data_get_node(child)); if (irq_data) { child->parent_data = irq_data; irq_data->irq = child->irq; diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index b1c7e8f46bfb..f9744853b656 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -363,7 +363,7 @@ static int setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) { struct cpumask *set = irq_default_affinity; - int node = desc->irq_data.node; + int node = irq_desc_get_node(desc); /* Excludes PER_CPU and NO_BALANCE interrupts */ if (!irq_can_set_affinity(irq)) diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index df2f4642d1e7..0e97c142ce40 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -241,7 +241,7 @@ static int irq_node_proc_show(struct seq_file *m, void *v) { struct irq_desc *desc = irq_to_desc((long) m->private); - seq_printf(m, "%d\n", desc->irq_data.node); + seq_printf(m, "%d\n", irq_desc_get_node(desc)); return 0; } -- cgit v1.2.3-58-ga151 From a614a610ac9b28f195d790d25be72d26f345c53a Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sat, 20 Jun 2015 12:05:40 +0200 Subject: genirq: Remove bogus restriction in irq_move_mask_irq() If an interrupt is marked with the no balancing flag, we still allow setting the affinity for such an interrupt from the kernel itself, but for interrupts which move the affinity from interrupt context via irq_move_mask_irq() this runs into a check for the no balancing flag, which in turn ends up with an endless storm of stack dumps because the move pending flag is not reset. Allow the move for interrupts which have the no balancing flag set and clear the move pending bit before checking for interrupts with the per cpu flag set. Reported-by: Sergey Senozhatsky Cc: Borislav Petkov Cc: Jiang Liu Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1506201002570.4107@nanos Signed-off-by: Thomas Gleixner --- kernel/irq/migration.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'kernel') diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c index dd203e276b07..37ddb7bda651 100644 --- a/kernel/irq/migration.c +++ b/kernel/irq/migration.c @@ -12,16 +12,16 @@ void irq_move_masked_irq(struct irq_data *idata) if (likely(!irqd_is_setaffinity_pending(&desc->irq_data))) return; + irqd_clr_move_pending(&desc->irq_data); + /* * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. */ - if (!irqd_can_balance(&desc->irq_data)) { + if (irqd_is_per_cpu(&desc->irq_data)) { WARN_ON(1); return; } - irqd_clr_move_pending(&desc->irq_data); - if (unlikely(cpumask_empty(desc->pending_mask))) return; -- cgit v1.2.3-58-ga151