forked from Minki/linux
4e77ae3e10
The clock events merge introduced a change to the nmi watchdog code to handle the not longer increasing local apic timer count in the broadcast mode. This is fine for UP, but on SMP it pampers over a stuck CPU which is not handling the broadcast interrupt due to the unconditional sum up of local apic timer count and irq0 count. To cover all cases we need to keep track on which CPU irq0 is handled. In theory this is CPU#0 due to the explicit disabling of irq balancing for irq0, but there are systems which ignore this on the hardware level. The per cpu irq0 accounting allows us to remove the irq0 to CPU0 binding as well. Add a per cpu counter for irq0 and evaluate this instead of the global irq0 count in the nmi watchdog code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
#ifndef X86_64_PDA_H
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#define X86_64_PDA_H
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#ifndef __ASSEMBLY__
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <asm/page.h>
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/* Per processor datastructure. %gs points to it while the kernel runs */
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struct x8664_pda {
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struct task_struct *pcurrent; /* 0 Current process */
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unsigned long data_offset; /* 8 Per cpu data offset from linker
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address */
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unsigned long kernelstack; /* 16 top of kernel stack for current */
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unsigned long oldrsp; /* 24 user rsp for system call */
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int irqcount; /* 32 Irq nesting counter. Starts with -1 */
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int cpunumber; /* 36 Logical CPU number */
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#ifdef CONFIG_CC_STACKPROTECTOR
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unsigned long stack_canary; /* 40 stack canary value */
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/* gcc-ABI: this canary MUST be at
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offset 40!!! */
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#endif
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char *irqstackptr;
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int nodenumber; /* number of current node */
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unsigned int __softirq_pending;
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unsigned int __nmi_count; /* number of NMI on this CPUs */
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short mmu_state;
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short isidle;
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struct mm_struct *active_mm;
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unsigned apic_timer_irqs;
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unsigned irq0_irqs;
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} ____cacheline_aligned_in_smp;
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extern struct x8664_pda *_cpu_pda[];
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extern struct x8664_pda boot_cpu_pda[];
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#define cpu_pda(i) (_cpu_pda[i])
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/*
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* There is no fast way to get the base address of the PDA, all the accesses
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* have to mention %fs/%gs. So it needs to be done this Torvaldian way.
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*/
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extern void __bad_pda_field(void) __attribute__((noreturn));
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/*
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* proxy_pda doesn't actually exist, but tell gcc it is accessed for
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* all PDA accesses so it gets read/write dependencies right.
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*/
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extern struct x8664_pda _proxy_pda;
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#define pda_offset(field) offsetof(struct x8664_pda, field)
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#define pda_to_op(op,field,val) do { \
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typedef typeof(_proxy_pda.field) T__; \
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if (0) { T__ tmp__; tmp__ = (val); } /* type checking */ \
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switch (sizeof(_proxy_pda.field)) { \
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case 2: \
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asm(op "w %1,%%gs:%c2" : \
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"+m" (_proxy_pda.field) : \
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"ri" ((T__)val), \
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"i"(pda_offset(field))); \
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break; \
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case 4: \
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asm(op "l %1,%%gs:%c2" : \
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"+m" (_proxy_pda.field) : \
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"ri" ((T__)val), \
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"i" (pda_offset(field))); \
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break; \
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case 8: \
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asm(op "q %1,%%gs:%c2": \
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"+m" (_proxy_pda.field) : \
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"ri" ((T__)val), \
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"i"(pda_offset(field))); \
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break; \
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default: \
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__bad_pda_field(); \
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} \
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} while (0)
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#define pda_from_op(op,field) ({ \
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typeof(_proxy_pda.field) ret__; \
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switch (sizeof(_proxy_pda.field)) { \
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case 2: \
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asm(op "w %%gs:%c1,%0" : \
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"=r" (ret__) : \
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"i" (pda_offset(field)), \
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"m" (_proxy_pda.field)); \
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break; \
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case 4: \
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asm(op "l %%gs:%c1,%0": \
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"=r" (ret__): \
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"i" (pda_offset(field)), \
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"m" (_proxy_pda.field)); \
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break; \
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case 8: \
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asm(op "q %%gs:%c1,%0": \
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"=r" (ret__) : \
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"i" (pda_offset(field)), \
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"m" (_proxy_pda.field)); \
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break; \
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default: \
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__bad_pda_field(); \
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} \
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ret__; })
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#define read_pda(field) pda_from_op("mov",field)
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#define write_pda(field,val) pda_to_op("mov",field,val)
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#define add_pda(field,val) pda_to_op("add",field,val)
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#define sub_pda(field,val) pda_to_op("sub",field,val)
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#define or_pda(field,val) pda_to_op("or",field,val)
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/* This is not atomic against other CPUs -- CPU preemption needs to be off */
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#define test_and_clear_bit_pda(bit,field) ({ \
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int old__; \
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asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \
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: "=r" (old__), "+m" (_proxy_pda.field) \
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: "dIr" (bit), "i" (pda_offset(field)) : "memory"); \
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old__; \
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})
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#endif
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#define PDA_STACKOFFSET (5*8)
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#endif
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