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Blackfin arch: add CONFIG_APP_STACKS_L1 to enable or disable putting kernel stacks in L1 

use CONFIG_APP_STACKS_L1 to enable or disable putting kernel stacks in L1,
default is enabled, SMP kernel need turn it off

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Graf Yang 2008-10-08 17:30:01 +08:00 committed by Bryan Wu
parent 7d98c881ee
commit ca87b7ad00
2 changed files with 51 additions and 37 deletions
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9
arch/blackfin/Kconfig
View File

@ -629,6 +629,15 @@ config CPLB_SWITCH_TAB_L1
If enabled, the CPLB Switch Tables are linked If enabled, the CPLB Switch Tables are linked
into L1 data memory. (less latency) into L1 data memory. (less latency)
config APP_STACK_L1
bool "Support locating application stack in L1 Scratch Memory"
default y
help
If enabled the application stack can be located in L1
scratch memory (less latency).
Currently only works with FLAT binaries.
comment "Speed Optimizations" comment "Speed Optimizations"
config BFIN_INS_LOWOVERHEAD config BFIN_INS_LOWOVERHEAD
bool "ins[bwl] low overhead, higher interrupt latency" bool "ins[bwl] low overhead, higher interrupt latency"

79
arch/blackfin/include/asm/mmu_context.h
View File

@ -45,49 +45,12 @@ extern unsigned long l1_stack_len;
extern int l1sram_free(const void*); extern int l1sram_free(const void*);
extern void *l1sram_alloc_max(void*); extern void *l1sram_alloc_max(void*);
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
/* Called when creating a new context during fork() or execve(). */
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
#ifdef CONFIG_MPU
unsigned long p = __get_free_pages(GFP_KERNEL, page_mask_order);
mm->context.page_rwx_mask = (unsigned long *)p;
memset(mm->context.page_rwx_mask, 0,
page_mask_nelts * 3 * sizeof(long));
#endif
return 0;
}
static inline void free_l1stack(void) static inline void free_l1stack(void)
{ {
nr_l1stack_tasks--; nr_l1stack_tasks--;
if (nr_l1stack_tasks == 0) if (nr_l1stack_tasks == 0)
l1sram_free(l1_stack_base); l1sram_free(l1_stack_base);
} }
static inline void destroy_context(struct mm_struct *mm)
{
struct sram_list_struct *tmp;
if (current_l1_stack_save == mm->context.l1_stack_save)
current_l1_stack_save = NULL;
if (mm->context.l1_stack_save)
free_l1stack();
while ((tmp = mm->context.sram_list)) {
mm->context.sram_list = tmp->next;
sram_free(tmp->addr);
kfree(tmp);
}
#ifdef CONFIG_MPU
if (current_rwx_mask == mm->context.page_rwx_mask)
current_rwx_mask = NULL;
free_pages((unsigned long)mm->context.page_rwx_mask, page_mask_order);
#endif
}
static inline unsigned long static inline unsigned long
alloc_l1stack(unsigned long length, unsigned long *stack_base) alloc_l1stack(unsigned long length, unsigned long *stack_base)
@ -134,6 +97,7 @@ static inline void switch_mm(struct mm_struct *prev_mm, struct mm_struct *next_m
} }
#endif #endif
#ifdef CONFIG_APP_STACK_L1
/* L1 stack switching. */ /* L1 stack switching. */
if (!next_mm->context.l1_stack_save) if (!next_mm->context.l1_stack_save)
return; return;
@ -144,6 +108,7 @@ static inline void switch_mm(struct mm_struct *prev_mm, struct mm_struct *next_m
} }
current_l1_stack_save = next_mm->context.l1_stack_save; current_l1_stack_save = next_mm->context.l1_stack_save;
memcpy(l1_stack_base, current_l1_stack_save, l1_stack_len); memcpy(l1_stack_base, current_l1_stack_save, l1_stack_len);
#endif
} }
#ifdef CONFIG_MPU #ifdef CONFIG_MPU
@ -180,4 +145,44 @@ static inline void update_protections(struct mm_struct *mm)
} }
#endif #endif
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
/* Called when creating a new context during fork() or execve(). */
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
#ifdef CONFIG_MPU
unsigned long p = __get_free_pages(GFP_KERNEL, page_mask_order);
mm->context.page_rwx_mask = (unsigned long *)p;
memset(mm->context.page_rwx_mask, 0,
page_mask_nelts * 3 * sizeof(long));
#endif
return 0;
}
static inline void destroy_context(struct mm_struct *mm)
{
struct sram_list_struct *tmp;
#ifdef CONFIG_APP_STACK_L1
if (current_l1_stack_save == mm->context.l1_stack_save)
current_l1_stack_save = 0;
if (mm->context.l1_stack_save)
free_l1stack();
#endif
while ((tmp = mm->context.sram_list)) {
mm->context.sram_list = tmp->next;
sram_free(tmp->addr);
kfree(tmp);
}
#ifdef CONFIG_MPU
if (current_rwx_mask == mm->context.page_rwx_mask)
current_rwx_mask = NULL;
free_pages((unsigned long)mm->context.page_rwx_mask, page_mask_order);
#endif
}
#endif #endif