linux-kernel - Re: [PATCH] ARM: omapfb: Add early framebuffer memory allocator

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Date:	Fri, 1 Jan 2016 13:01:27 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	tomi.valkeinen@...com
Cc:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>, tony@...mide.com,
	linux@....linux.org.uk, pavel@....cz, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ivaylo Dimitrov <freemangordon@....bg>
Subject: Re: [PATCH] ARM: omapfb: Add early framebuffer memory allocator

Hi Tomi! Can you review this patch? It is waiting here for two years!

On Thursday 26 December 2013 00:12:39 Ivaylo Dimitrov wrote:
> From: Ivaylo Dimitrov <freemangordon@....bg>
> 
> On memory limited devices, CMA fails easily when asked to allocate
> big chunks of memory like framebuffer memory needed for video
> playback.
> 
> Add boot parameter "omapfb_memsize" which allocates memory to be used
> as dma coherent memory, so dma_alloc_attrs won't hit CMA allocator
> when trying to allocate memory for the framebuffers
> 
> Signed-off-by: Ivaylo Dimitrov <freemangordon@....bg>
> ---
>  arch/arm/mach-omap2/common.c |    1 +
>  arch/arm/mach-omap2/common.h |    2 +
>  arch/arm/mach-omap2/fb.c     |   46
> +++++++++++++++++++++++++++++++++++++++++- 3 files changed, 48
> insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/common.c
> b/arch/arm/mach-omap2/common.c index 2dabb9e..9beecde 100644
> --- a/arch/arm/mach-omap2/common.c
> +++ b/arch/arm/mach-omap2/common.c
> @@ -33,4 +33,5 @@ void __init omap_reserve(void)
>  	omap_dsp_reserve_sdram_memblock();
>  	omap_secure_ram_reserve_memblock();
>  	omap_barrier_reserve_memblock();
> +	omap_fb_reserve_memblock();
>  }
> diff --git a/arch/arm/mach-omap2/common.h
> b/arch/arm/mach-omap2/common.h index e30ef67..21afdc0 100644
> --- a/arch/arm/mach-omap2/common.h
> +++ b/arch/arm/mach-omap2/common.h
> @@ -304,6 +304,8 @@ extern void omap_reserve(void);
>  struct omap_hwmod;
>  extern int omap_dss_reset(struct omap_hwmod *);
> 
> +extern void omap_fb_reserve_memblock(void);
> +
>  /* SoC specific clock initializer */
>  extern int (*omap_clk_init)(void);
> 
> diff --git a/arch/arm/mach-omap2/fb.c b/arch/arm/mach-omap2/fb.c
> index 26e28e9..0eacbe9 100644
> --- a/arch/arm/mach-omap2/fb.c
> +++ b/arch/arm/mach-omap2/fb.c
> @@ -30,6 +30,7 @@
>  #include <linux/dma-mapping.h>
> 
>  #include <asm/mach/map.h>
> +#include <asm/memblock.h>
> 
>  #include "soc.h"
>  #include "display.h"
> @@ -106,10 +107,53 @@ static struct platform_device omap_fb_device =
> { .num_resources = 0,
>  };
> 
> +static phys_addr_t omapfb_mem_base __initdata;
> +static phys_addr_t omapfb_mem_size __initdata;
> +
> +void __init omap_fb_reserve_memblock(void)
> +{
> +	if (omapfb_mem_size) {
> +		omapfb_mem_base = arm_memblock_steal(omapfb_mem_size, SZ_1M);
> +		if (omapfb_mem_base)
> +			pr_info("omapfb: reserved %u bytes at %x\n",
> +				omapfb_mem_size, omapfb_mem_base);
> +		else
> +			pr_err("omapfb: arm_memblock_steal failed\n");
> +	}
> +}
> +
>  int __init omap_init_fb(void)
>  {
> -	return platform_device_register(&omap_fb_device);
> +	int ret;
> +
> +	ret = platform_device_register(&omap_fb_device);
> +
> +	if (ret)
> +		return ret;
> +
> +	if (!omapfb_mem_base)
> +		return 0;
> +
> +	ret = dma_declare_coherent_memory(&omap_fb_device.dev,
> +					  omapfb_mem_base, omapfb_mem_base,
> +					  omapfb_mem_size, DMA_MEMORY_MAP |
> +					  DMA_MEMORY_EXCLUSIVE);
> +	if (!(ret & DMA_MEMORY_MAP))
> +		pr_err("omapfb: dma_declare_coherent_memory failed\n");
> +
> +	return 0;
> +}
> +
> +static int __init early_omapfb_memsize(char *p)
> +{
> +	omapfb_mem_size = ALIGN(memparse(p, &p), SZ_1M);
> +
> +	if(!omapfb_mem_size)
> +		pr_err("omapfb: bad memsize parameter\n");
> +
> +	return 0;
>  }
> +early_param("omapfb_memsize", early_omapfb_memsize);
>  #else
>  int __init omap_init_fb(void) { return 0; }
>  #endif

-- 
Pali Rohár
pali.rohar@...il.com

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