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Commit ca87b7ad authored by Graf Yang's avatar Graf Yang Committed by Bryan Wu
Browse files

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: default avatarGraf Yang <graf.yang@analog.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent 7d98c881

arch/blackfin/Kconfig

+9 −0
Original line number Original line Diff line number Diff line
@@ -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"

arch/blackfin/include/asm/mmu_context.h

+42 −37
Original line number Original line Diff line number Diff line
@@ -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