[U-Boot] [PATCH v4] armv8: caches: Added routine to set non cacheable region

[Albert ARIBAUD <albert.u.boot@aribaud.net>]

Hello Siva,

On Fri, 26 Jun 2015 18:05:07 +0530, Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com> wrote:
> Added routine mmu_set_region_dcache_behaviour() to set a
> particular region as non cacheable.
> 
> Define dummy routine for mmu_set_region_dcache_behaviour()
> to handle incase of dcache off.
> 
> Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
> Acked-by: Michal Simek <michal.simek@xilinx.com>
> ---
> Changes for v4:
> - Added DSB and ISB's as per review comment
> Changes in v3:
> - Removed board depenedency to calculate the page table
>   address to start with looking into the entry. Now, get
>   the page table address from the board specific code.
> - Updated flush dcache with actual Page address instead
>   of MMU entry.
> Changes in v2:
> - Fix patch subject (remove addional zzz from v1)
> - Remove armv8: caches: Disable dcache after flush patch from this
>   series based on the talk with Mark Rutland (patch is not needed
>   anymore)
> ---
>  arch/arm/cpu/armv8/cache_v8.c |   36 ++++++++++++++++++++++++++++++++++++
>  arch/arm/include/asm/system.h |   29 +++++++++++++++++++----------
>  2 files changed, 55 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
> index c5ec529..bddcdf7 100644
> --- a/arch/arm/cpu/armv8/cache_v8.c
> +++ b/arch/arm/cpu/armv8/cache_v8.c
> @@ -139,6 +139,37 @@ int dcache_status(void)
>  	return (get_sctlr() & CR_C) != 0;
>  }
>  
> +u64 *__weak arch_get_page_table(void) {
> +	puts("No page table offset defined\n");
> +
> +	return NULL;
> +}
> +
> +void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
> +				     enum dcache_option option)
> +{
> +	u64 *page_table = arch_get_page_table();
> +	u64 upto, end;
> +
> +	if (page_table == NULL)
> +		return;
> +
> +	end = ALIGN(start + size, (1 << MMU_SECTION_SHIFT)) >>
> +	      MMU_SECTION_SHIFT;
> +	start = start >> MMU_SECTION_SHIFT;
> +	for (upto = start; upto < end; upto++) {
> +		page_table[upto] &= ~PMD_ATTRINDX_MASK;
> +		page_table[upto] |= PMD_ATTRINDX(option);
> +	}
> +	asm volatile("dsb sy");
> +	__asm_invalidate_tlb_all();
> +	asm volatile("dsb sy");
> +	asm volatile("isb");
> +	start = start << MMU_SECTION_SHIFT;
> +	end = end << MMU_SECTION_SHIFT;
> +	flush_dcache_range(start, end);
> +	asm volatile("dsb sy");
> +}
>  #else	/* CONFIG_SYS_DCACHE_OFF */
>  
>  void invalidate_dcache_all(void)
> @@ -170,6 +201,11 @@ int dcache_status(void)
>  	return 0;
>  }
>  
> +void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
> +				     enum dcache_option option)
> +{
> +}
> +
>  #endif	/* CONFIG_SYS_DCACHE_OFF */
>  
>  #ifndef CONFIG_SYS_ICACHE_OFF
> diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
> index 760e8ab..868ea54 100644
> --- a/arch/arm/include/asm/system.h
> +++ b/arch/arm/include/asm/system.h
> @@ -15,9 +15,15 @@
>  #define CR_EE		(1 << 25)	/* Exception (Big) Endian	*/
>  
>  #define PGTABLE_SIZE	(0x10000)
> +/* 2MB granularity */
> +#define MMU_SECTION_SHIFT	21
>  
>  #ifndef __ASSEMBLY__
>  
> +enum dcache_option {
> +	DCACHE_OFF = 0x3,
> +};
> +
>  #define isb()				\
>  	({asm volatile(			\
>  	"isb" : : : "memory");		\
> @@ -265,16 +271,6 @@ enum {
>  #endif
>  
>  /**
> - * Change the cache settings for a region.
> - *
> - * \param start		start address of memory region to change
> - * \param size		size of memory region to change
> - * \param option	dcache option to select
> - */
> -void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
> -				     enum dcache_option option);
> -
> -/**
>   * Register an update to the page tables, and flush the TLB
>   *
>   * \param start		start address of update in page table
> @@ -295,4 +291,17 @@ phys_addr_t noncached_alloc(size_t size, size_t align);
>  
>  #endif /* CONFIG_ARM64 */
>  
> +#ifndef __ASSEMBLY__
> +/**
> + * Change the cache settings for a region.
> + *
> + * \param start		start address of memory region to change
> + * \param size		size of memory region to change
> + * \param option	dcache option to select
> + */
> +void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
> +				     enum dcache_option option);
> +
> +#endif /* __ASSEMBLY__ */
> +
>  #endif
> -- 
> 1.7.1
> 
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Applied to u-boot-arm/master, thanks!

Amicalement,
-- 
Albert.