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authorAshok Raj <ashok.raj@intel.com>2005-09-06 18:16:15 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 19:57:15 -0400
commit54d5d42404e7705cf3804593189e963350d470e5 (patch)
tree7cf8a7fce163b19672193d8cf4ef6a7f6c131d9e /include/asm-ia64
parentf63ed39c578a2a2d067356a85ce7c28a7c795d8a (diff)
[PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinity
When handling writes to /proc/irq, current code is re-programming rte entries directly. This is not recommended and could potentially cause chipset's to lockup, or cause missing interrupts. CONFIG_IRQ_BALANCE does this correctly, where it re-programs only when the interrupt is pending. The same needs to be done for /proc/irq handling as well. Otherwise user space irq balancers are really not doing the right thing. - Changed pending_irq_balance_cpumask to pending_irq_migrate_cpumask for lack of a generic name. - added move_irq out of IRQ_BALANCE, and added this same to X86_64 - Added new proc handler for write, so we can do deferred write at irq handling time. - Display of /proc/irq/XX/smp_affinity used to display CPU_MASKALL, instead it now shows only active cpu masks, or exactly what was set. - Provided a common move_irq implementation, instead of duplicating when using generic irq framework. Tested on i386/x86_64 and ia64 with CONFIG_PCI_MSI turned on and off. Tested UP builds as well. MSI testing: tbd: I have cards, need to look for a x-over cable, although I did test an earlier version of this patch. Will test in a couple days. Signed-off-by: Ashok Raj <ashok.raj@intel.com> Acked-by: Zwane Mwaikambo <zwane@holomorphy.com> Grudgingly-acked-by: Andi Kleen <ak@muc.de> Signed-off-by: Coywolf Qi Hunt <coywolf@lovecn.org> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-ia64')
-rw-r--r--include/asm-ia64/hw_irq.h7
-rw-r--r--include/asm-ia64/irq.h6
2 files changed, 0 insertions, 13 deletions
diff --git a/include/asm-ia64/hw_irq.h b/include/asm-ia64/hw_irq.h
index 041ab8c51a64..0cf119b42f7d 100644
--- a/include/asm-ia64/hw_irq.h
+++ b/include/asm-ia64/hw_irq.h
@@ -116,13 +116,6 @@ __ia64_local_vector_to_irq (ia64_vector vec)
116 * and to obtain the irq descriptor for a given irq number. 116 * and to obtain the irq descriptor for a given irq number.
117 */ 117 */
118 118
119/* Return a pointer to the irq descriptor for IRQ. */
120static inline irq_desc_t *
121irq_descp (int irq)
122{
123 return irq_desc + irq;
124}
125
126/* Extract the IA-64 vector that corresponds to IRQ. */ 119/* Extract the IA-64 vector that corresponds to IRQ. */
127static inline ia64_vector 120static inline ia64_vector
128irq_to_vector (int irq) 121irq_to_vector (int irq)
diff --git a/include/asm-ia64/irq.h b/include/asm-ia64/irq.h
index bd07d11d9f37..5d930fdc0bea 100644
--- a/include/asm-ia64/irq.h
+++ b/include/asm-ia64/irq.h
@@ -30,12 +30,6 @@ extern void disable_irq_nosync (unsigned int);
30extern void enable_irq (unsigned int); 30extern void enable_irq (unsigned int);
31extern void set_irq_affinity_info (unsigned int irq, int dest, int redir); 31extern void set_irq_affinity_info (unsigned int irq, int dest, int redir);
32 32
33#ifdef CONFIG_SMP
34extern void move_irq(int irq);
35#else
36#define move_irq(irq)
37#endif
38
39struct irqaction; 33struct irqaction;
40struct pt_regs; 34struct pt_regs;
41int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *); 35int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);