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arch/tile: Save and restore extra user state for tilegx 

During context switch, save and restore a couple of additional bits of
tilegx user state that can be persistently modified by userspace.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2010-09-15 11:16:10 -04:00
parent 74fca9da09
commit a802fc6854
4 changed files with 34 additions and 7 deletions
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3
arch/tile/include/arch/chip_tile64.h
View File

@ -150,6 +150,9 @@
/** Is the PROC_STATUS SPR supported? */
#define CHIP_HAS_PROC_STATUS_SPR() 0
/** Is the DSTREAM_PF SPR supported? */
#define CHIP_HAS_DSTREAM_PF() 0
/** Log of the number of mshims we have. */
#define CHIP_LOG_NUM_MSHIMS() 2

3
arch/tile/include/arch/chip_tilepro.h
View File

@ -150,6 +150,9 @@
/** Is the PROC_STATUS SPR supported? */
#define CHIP_HAS_PROC_STATUS_SPR() 1
/** Is the DSTREAM_PF SPR supported? */
#define CHIP_HAS_DSTREAM_PF() 0
/** Log of the number of mshims we have. */
#define CHIP_LOG_NUM_MSHIMS() 2

12
arch/tile/include/asm/processor.h
View File

@ -103,6 +103,18 @@ struct thread_struct {
/* Any other miscellaneous processor state bits */
unsigned long proc_status;
#endif
#if !CHIP_HAS_FIXED_INTVEC_BASE()
/* Interrupt base for PL0 interrupts */
unsigned long interrupt_vector_base;
#endif
#if CHIP_HAS_TILE_RTF_HWM()
/* Tile cache retry fifo high-water mark */
unsigned long tile_rtf_hwm;
#endif
#if CHIP_HAS_DSTREAM_PF()
/* Data stream prefetch control */
unsigned long dstream_pf;
#endif
#ifdef CONFIG_HARDWALL
/* Is this task tied to an activated hardwall? */
struct hardwall_info *hardwall;

23
arch/tile/kernel/process.c
View File

@ -408,6 +408,15 @@ static void save_arch_state(struct thread_struct *t)
#if CHIP_HAS_PROC_STATUS_SPR()
t->proc_status = __insn_mfspr(SPR_PROC_STATUS);
#endif
#if !CHIP_HAS_FIXED_INTVEC_BASE()
t->interrupt_vector_base = __insn_mfspr(SPR_INTERRUPT_VECTOR_BASE_0);
#endif
#if CHIP_HAS_TILE_RTF_HWM()
t->tile_rtf_hwm = __insn_mfspr(SPR_TILE_RTF_HWM);
#endif
#if CHIP_HAS_DSTREAM_PF()
t->dstream_pf = __insn_mfspr(SPR_DSTREAM_PF);
#endif
}
static void restore_arch_state(const struct thread_struct *t)
@ -428,14 +437,14 @@ static void restore_arch_state(const struct thread_struct *t)
#if CHIP_HAS_PROC_STATUS_SPR()
__insn_mtspr(SPR_PROC_STATUS, t->proc_status);
#endif
#if !CHIP_HAS_FIXED_INTVEC_BASE()
__insn_mtspr(SPR_INTERRUPT_VECTOR_BASE_0, t->interrupt_vector_base);
#endif
#if CHIP_HAS_TILE_RTF_HWM()
/*
* Clear this whenever we switch back to a process in case
* the previous process was monkeying with it. Even if enabled
* in CBOX_MSR1 via TILE_RTF_HWM_MIN, it's still just a
* performance hint, so isn't worth a full save/restore.
*/
__insn_mtspr(SPR_TILE_RTF_HWM, 0);
__insn_mtspr(SPR_TILE_RTF_HWM, t->tile_rtf_hwm);
#endif
#if CHIP_HAS_DSTREAM_PF()
__insn_mtspr(SPR_DSTREAM_PF, t->dstream_pf);
#endif
}