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From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-arch@vger.kernel.org, Michal Simek <monstr@monstr.eu>,
	Greentime Hu <green.hu@gmail.com>,
	Vincent Chen <deanbo422@gmail.com>,
	linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-c6x-dev@linux-c6x.org, linux-hexagon@vger.kernel.org,
	linux-m68k@vger.kernel.org, nios2-dev@lists.rocketboards.org,
	openrisc@lists.librecores.org, linux-parisc@vger.kernel.org,
	linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
	linux-xtensa@linux-xtensa.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 22/22] parisc: use generic dma_noncoherent_ops
Date: Sat, 21 Apr 2018 22:42:47 +0100	[thread overview]
Message-ID: <1524346967.3335.9.camel@HansenPartnership.com> (raw)
In-Reply-To: <20180420080313.18796-23-hch@lst.de>

On Fri, 2018-04-20 at 10:03 +0200, Christoph Hellwig wrote:
> diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c
> index 8d3a7b80ac42..4e87c35c22b7 100644
> --- a/arch/parisc/kernel/setup.c
> +++ b/arch/parisc/kernel/setup.c
> @@ -97,14 +97,12 @@ void __init dma_ops_init(void)
>  		panic(	"PA-RISC Linux currently only supports
> machines that conform to\n"
>  			"the PA-RISC 1.1 or 2.0 architecture
> specification.\n");
>  
> -	case pcxs:
> -	case pcxt:
> -		hppa_dma_ops = &pcx_dma_ops;
> -		break;
>  	case pcxl2:
>  		pa7300lc_init();
>  	case pcxl: /* falls through */
> -		hppa_dma_ops = &pcxl_dma_ops;
> +	case pcxs:
> +	case pcxt:
> +		hppa_dma_ops = &dma_noncoherent_ops;
>  		break;
>  	default:
>  		break;

Well, this is wrong: you just made every 32 bit parisc system
unnecessarily use non-coherent.  We actually only have a small small
set of non-coherent systems.  The pxcs and pcxt systems (which are
about 99% of the user base) can use coherent dma ops.  The problem
seems to be in your new world you only have one dma_noncoherent_ops
pointer ... we definitely need two on parisc, so whether
arch_dma_cache_sync is present or not needs to be dynamic not config
defined.

James

  parent reply	other threads:[~2018-04-21 21:43 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-20  8:02 Christoph Hellwig
2018-04-20  8:02 ` [PATCH 01/22] dma-debug: move initialization to common code Christoph Hellwig
2018-04-20 10:23   ` Robin Murphy
2018-04-24  7:35     ` Christoph Hellwig
2018-04-20  8:02 ` [PATCH 02/22] dma-mapping: simplify Kconfig dependencies Christoph Hellwig
2018-04-20  8:02 ` [PATCH 03/22] dma-mapping: provide a generic dma-noncoherent implementation Christoph Hellwig
2018-04-20  8:02 ` [PATCH 04/22] alpha: use dma_direct_ops for jensen Christoph Hellwig
2018-04-20  8:02 ` [PATCH 05/22] alpha: simplify get_arch_dma_ops Christoph Hellwig
2018-04-20  8:02 ` [PATCH 06/22] arc: use generic dma_noncoherent_ops Christoph Hellwig
2018-04-25 11:17   ` Alexey Brodkin
2018-04-26  6:45     ` hch
2018-04-26  8:25       ` hch
2018-04-20  8:02 ` [PATCH 07/22] arm-nommu: " Christoph Hellwig
2018-04-20  8:02 ` [PATCH 08/22] c6x: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 09/22] hexagon: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 10/22] m68k: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 11/22] microblaze: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 12/22] microblaze: remove the consistent_sync and consistent_sync_page Christoph Hellwig
2018-04-20  8:03 ` [PATCH 13/22] nds32: use generic dma_noncoherent_ops Christoph Hellwig
2018-04-23  6:49   ` Greentime Hu
2018-04-24 19:16     ` Christoph Hellwig
2018-04-25  1:43       ` Greentime Hu
2018-04-25  6:40         ` Christoph Hellwig
2018-04-25 12:25           ` Greentime Hu
2018-04-26  6:42             ` Christoph Hellwig
2018-04-26  8:06               ` Greentime Hu
2018-04-26  8:24                 ` Christoph Hellwig
2018-04-26  9:39                   ` Greentime Hu
2018-04-20  8:03 ` [PATCH 14/22] nios2: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 15/22] openrisc: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 16/22] sh: simplify get_arch_dma_ops Christoph Hellwig
2018-04-20  8:03 ` [PATCH 17/22] sh: introduce a sh_cacheop_vaddr helper Christoph Hellwig
2018-04-20  8:03 ` [PATCH 18/22] sh: use dma_direct_ops for the CONFIG_DMA_COHERENT case Christoph Hellwig
2018-04-20  8:03 ` [PATCH 19/22] sh: use generic dma_noncoherent_ops Christoph Hellwig
2018-04-20  8:03 ` [PATCH 20/22] xtensa: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 21/22] sparc: " Christoph Hellwig
2018-04-20  8:03 ` [PATCH 22/22] parisc: " Christoph Hellwig
2018-04-21 17:43   ` Helge Deller
2018-04-21 21:52     ` James Bottomley
2018-04-25  7:21     ` Christoph Hellwig
2018-04-25 21:07       ` Helge Deller
2018-04-21 21:42   ` James Bottomley [this message]
2018-04-24  8:20     ` Christoph Hellwig

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