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From: Andrew Murray <andrew.murray@arm.com>
To: Marek Vasut <marek.vasut@gmail.com>
Cc: Simon Horman <horms@verge.net.au>,
	linux-pci@vger.kernel.org,
	Marek Vasut <marek.vasut+renesas@gmail.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Wolfram Sang <wsa@the-dreams.de>,
	linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH V3 2/3] PCI: rcar: Do not abort on too many inbound dma-ranges
Date: Mon, 21 Oct 2019 11:18:06 +0100
Message-ID: <20191021101805.GM47056@e119886-lin.cambridge.arm.com> (raw)
In-Reply-To: <8f1871ed-4820-1985-0090-bb9e2d8803d8@gmail.com>

On Fri, Aug 16, 2019 at 03:28:04PM +0200, Marek Vasut wrote:
> On 8/16/19 3:23 PM, Simon Horman wrote:
> > On Fri, Aug 09, 2019 at 07:57:40PM +0200, marek.vasut@gmail.com wrote:
> >> From: Marek Vasut <marek.vasut+renesas@gmail.com>
> >>
> >> In case the "dma-ranges" DT property contains either too many ranges
> >> or the range start address is unaligned in such a way that populating
> >> the range into the controller requires multiple entries, a situation
> >> may occur where all ranges cannot be loaded into the controller.
> >>
> >> Currently, the driver refuses to probe in such a situation. Relax this
> >> behavior, load as many ranges as possible and warn if some ranges do
> >> not fit anymore.
> > 
> > What is the motivation for relaxing this?
> 
> U-Boot can fill the ranges in properly now, the list would be longer in
> such a case and the driver would fail to probe (because the list is
> longer than what the hardware can support).

Is this the U-Boot patch you refer to:

https://patchwork.ozlabs.org/patch/1129436/

As pci_set_region is called with the same address for PCI and CPU memory
this implies there is a 1:1 mapping - therefore I don't see a need for
multiple mappings for each DRAM bank. (Also if this controller has a
32 bit limitation, shouldn't this code limit the addresses before calling
pci_set_region?).

Thanks,

Andrew Murray

> 
> -- 
> Best regards,
> Marek Vasut

  parent reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-09 17:57 [PATCH V3 1/3] PCI: rcar: Move the inbound index check marek.vasut
2019-08-09 17:57 ` [PATCH V3 2/3] PCI: rcar: Do not abort on too many inbound dma-ranges marek.vasut
2019-08-16 13:23   ` Simon Horman
2019-08-16 13:28     ` Marek Vasut
2019-08-16 13:38       ` Simon Horman
2019-08-16 17:41         ` Marek Vasut
2019-10-21 10:18       ` Andrew Murray [this message]
2019-10-26 18:03         ` Marek Vasut
2019-10-26 20:36           ` Andrew Murray
2019-10-26 21:06             ` Andrew Murray
2019-11-06 23:37             ` Marek Vasut
2019-11-07 14:19               ` Andrew Murray
2019-10-16 15:00   ` Lorenzo Pieralisi
2019-10-16 15:10     ` Marek Vasut
2019-10-16 15:26       ` Lorenzo Pieralisi
2019-10-16 15:29         ` Marek Vasut
2019-10-16 16:18           ` Lorenzo Pieralisi
2019-10-16 18:12             ` Rob Herring
2019-10-16 18:17               ` Marek Vasut
2019-10-16 20:25                 ` Rob Herring
2019-10-16 21:15                   ` Marek Vasut
2019-10-16 22:26                     ` Rob Herring
2019-10-16 22:33                       ` Marek Vasut
2019-10-17  7:06                         ` Geert Uytterhoeven
2019-10-17 10:55                           ` Marek Vasut
2019-10-17 13:06                             ` Robin Murphy
2019-10-17 14:00                               ` Marek Vasut
2019-10-17 14:36                                 ` Rob Herring
2019-10-17 15:01                                   ` Marek Vasut
2019-10-18  9:53                                     ` Lorenzo Pieralisi
2019-10-18 12:22                                       ` Marek Vasut
2019-10-18 12:53                                         ` Robin Murphy
2019-10-18 14:26                                           ` Marek Vasut
2019-10-18 15:44                                             ` Robin Murphy
2019-10-18 16:44                                               ` Marek Vasut
2019-10-18 17:35                                                 ` Robin Murphy
2019-10-18 18:44                                                   ` Marek Vasut
2019-10-21  8:32                                                     ` Geert Uytterhoeven
2019-10-18 10:06                         ` Andrew Murray
2019-10-18 10:17                           ` Geert Uytterhoeven
2019-10-18 11:40                             ` Andrew Murray
2019-08-09 17:57 ` [PATCH V3 3/3] PCI: rcar: Recalculate inbound range alignment for each controller entry marek.vasut
2019-10-21 10:39   ` Andrew Murray
2019-08-16 10:52 ` [PATCH V3 1/3] PCI: rcar: Move the inbound index check Lorenzo Pieralisi
2019-08-16 10:59   ` Marek Vasut
2019-08-16 11:10     ` Lorenzo Pieralisi
2019-10-15 20:14 ` Marek Vasut
2019-10-21 10:11 ` Andrew Murray

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