048c8bc90e
Add CONFIG_DEBUG_PREEMPT support to ppc64: it was useful for testing get_paca() preemption. Cheat a little, just use debug_smp_processor_id() in the debug version of get_paca(): it contains all the right checks and reporting, though get_paca() doesn't really use smp_processor_id(). Use local_paca for what might have been called __raw_get_paca(). Silence harmless warnings from io.h and lparcfg.c with local_paca - it is okay for iseries_lparcfg_data to be referencing shared_proc with preemption enabled: all cpus should show the same value for shared_proc. Why do other architectures need TRACE_IRQFLAGS_SUPPORT for DEBUG_PREEMPT? I don't know, ppc64 appears to get along fine without it. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/*
|
|
* include/asm-powerpc/paca.h
|
|
*
|
|
* This control block defines the PACA which defines the processor
|
|
* specific data for each logical processor on the system.
|
|
* There are some pointers defined that are utilized by PLIC.
|
|
*
|
|
* C 2001 PPC 64 Team, IBM Corp
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_POWERPC_PACA_H
|
|
#define _ASM_POWERPC_PACA_H
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/types.h>
|
|
#include <asm/lppaca.h>
|
|
#include <asm/mmu.h>
|
|
|
|
register struct paca_struct *local_paca asm("r13");
|
|
|
|
#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
|
|
extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
|
|
/*
|
|
* Add standard checks that preemption cannot occur when using get_paca():
|
|
* otherwise the paca_struct it points to may be the wrong one just after.
|
|
*/
|
|
#define get_paca() ((void) debug_smp_processor_id(), local_paca)
|
|
#else
|
|
#define get_paca() local_paca
|
|
#endif
|
|
|
|
#define get_lppaca() (get_paca()->lppaca_ptr)
|
|
#define get_slb_shadow() (get_paca()->slb_shadow_ptr)
|
|
|
|
struct task_struct;
|
|
|
|
/*
|
|
* Defines the layout of the paca.
|
|
*
|
|
* This structure is not directly accessed by firmware or the service
|
|
* processor except for the first two pointers that point to the
|
|
* lppaca area and the ItLpRegSave area for this CPU. The lppaca
|
|
* object is currently contained within the PACA but it doesn't need
|
|
* to be.
|
|
*/
|
|
struct paca_struct {
|
|
/*
|
|
* Because hw_cpu_id, unlike other paca fields, is accessed
|
|
* routinely from other CPUs (from the IRQ code), we stick to
|
|
* read-only (after boot) fields in the first cacheline to
|
|
* avoid cacheline bouncing.
|
|
*/
|
|
|
|
/*
|
|
* MAGIC: These first two pointers can't be moved - they're
|
|
* accessed by the firmware
|
|
*/
|
|
struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
|
|
#ifdef CONFIG_PPC_ISERIES
|
|
void *reg_save_ptr; /* Pointer to LpRegSave for PLIC */
|
|
#endif /* CONFIG_PPC_ISERIES */
|
|
|
|
/*
|
|
* MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
|
|
* load lock_token and paca_index with a single lwz
|
|
* instruction. They must travel together and be properly
|
|
* aligned.
|
|
*/
|
|
u16 lock_token; /* Constant 0x8000, used in locks */
|
|
u16 paca_index; /* Logical processor number */
|
|
|
|
u64 kernel_toc; /* Kernel TOC address */
|
|
u64 stab_real; /* Absolute address of segment table */
|
|
u64 stab_addr; /* Virtual address of segment table */
|
|
void *emergency_sp; /* pointer to emergency stack */
|
|
u64 data_offset; /* per cpu data offset */
|
|
s16 hw_cpu_id; /* Physical processor number */
|
|
u8 cpu_start; /* At startup, processor spins until */
|
|
/* this becomes non-zero. */
|
|
struct slb_shadow *slb_shadow_ptr;
|
|
|
|
/*
|
|
* Now, starting in cacheline 2, the exception save areas
|
|
*/
|
|
/* used for most interrupts/exceptions */
|
|
u64 exgen[10] __attribute__((aligned(0x80)));
|
|
u64 exmc[10]; /* used for machine checks */
|
|
u64 exslb[10]; /* used for SLB/segment table misses
|
|
* on the linear mapping */
|
|
|
|
mm_context_t context;
|
|
u16 vmalloc_sllp;
|
|
u16 slb_cache_ptr;
|
|
u16 slb_cache[SLB_CACHE_ENTRIES];
|
|
|
|
/*
|
|
* then miscellaneous read-write fields
|
|
*/
|
|
struct task_struct *__current; /* Pointer to current */
|
|
u64 kstack; /* Saved Kernel stack addr */
|
|
u64 stab_rr; /* stab/slb round-robin counter */
|
|
u64 saved_r1; /* r1 save for RTAS calls */
|
|
u64 saved_msr; /* MSR saved here by enter_rtas */
|
|
u16 trap_save; /* Used when bad stack is encountered */
|
|
u8 soft_enabled; /* irq soft-enable flag */
|
|
u8 hard_enabled; /* set if irqs are enabled in MSR */
|
|
u8 io_sync; /* writel() needs spin_unlock sync */
|
|
|
|
/* Stuff for accurate time accounting */
|
|
u64 user_time; /* accumulated usermode TB ticks */
|
|
u64 system_time; /* accumulated system TB ticks */
|
|
u64 startpurr; /* PURR/TB value snapshot */
|
|
};
|
|
|
|
extern struct paca_struct paca[];
|
|
|
|
void setup_boot_paca(void);
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_POWERPC_PACA_H */
|