linux-kernel - Re: [PATCH 27/27] agp/intel: use dma_alloc

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Date:	Mon, 30 Mar 2009 22:12:43 +0100 (IST)
From:	Dave Airlie <airlied@...ux.ie>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 27/27] agp/intel: use dma_alloc_coherent for special
 cursor memory



> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> Given that i810 wants special physically contiguous memory for its cursor,
> allocate it with dma_alloc_coherent, which will give us memory with the
> right properties.  This is particularly for Xen, which won't normally
> give us physically contiuous memory.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Cc: David Airlie <airlied@...ux.ie>

Acked-by: David Airlie <airlied@...ux.ie>

> ---
>  drivers/char/agp/intel-agp.c |   26 +++++++++++---------------
>  1 files changed, 11 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
> index 4373adb..8ba6808 100644
> --- a/drivers/char/agp/intel-agp.c
> +++ b/drivers/char/agp/intel-agp.c
> @@ -244,33 +244,29 @@ static void intel_i810_agp_enable(struct agp_bridge_data *bridge, u32 mode)
>  /* Exists to support ARGB cursors */
>  static void *i8xx_alloc_pages(void)
>  {
> -	struct page *page;
> -
> -	page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
> -	if (page == NULL)
> +	void *addr;
> +	dma_addr_t _d;
> +	
> +	addr = dma_alloc_coherent(NULL, 4 * PAGE_SIZE, &_d, GFP_KERNEL);
> +	if (addr == NULL)
>  		return NULL;
>  
> -	if (set_pages_uc(page, 4) < 0) {
> -		set_pages_wb(page, 4);
> -		__free_pages(page, 2);
> +	if (set_memory_uc((unsigned long)addr, 4) < 0) {
> +		set_memory_wb((unsigned long)addr, 4);
> +		dma_free_coherent(NULL, 4 * PAGE_SIZE, addr, _d);
>  		return NULL;
>  	}
> -	get_page(page);
>  	atomic_inc(&agp_bridge->current_memory_agp);
> -	return page_address(page);
> +	return addr;
>  }
>  
>  static void i8xx_destroy_pages(void *addr)
>  {
> -	struct page *page;
> -
>  	if (addr == NULL)
>  		return;
>  
> -	page = virt_to_page(addr);
> -	set_pages_wb(page, 4);
> -	put_page(page);
> -	__free_pages(page, 2);
> +	set_memory_wb((unsigned long)addr, 4);
> +	dma_free_coherent(NULL, 4 * PAGE_SIZE, addr, virt_to_bus(addr));
>  	atomic_dec(&agp_bridge->current_memory_agp);
>  }
>  
> 
--
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