linux-kernel - Re: [PATCH v3 08/32] cris: include default ioremap

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Date:   Tue, 11 Apr 2017 15:15:59 +0200
From:   Jesper Nilsson <jesper.nilsson@...s.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Niklas Cassel <nks@...wful.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jesper Nilsson <jespern@...s.com>,
        Mikael Starvik <starvik@...s.com>
Subject: Re: [PATCH v3 08/32] cris: include default ioremap_nopost()
 implementation

On Tue, Apr 11, 2017 at 01:28:48PM +0100, Lorenzo Pieralisi wrote:
> The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and Posting")
> mandate non-posted configuration transactions. As further highlighted in
> the PCIe specifications (4.0 - Rev0.3, "Ordering Considerations for the
> Enhanced Configuration Access Mechanism"), through ECAM and
> ECAM-derivative configuration mechanism, the memory mapped transactions
> from the host CPU into Configuration Requests on the PCI express fabric
> may create ordering problems for software because writes to memory
> address are typically posted transactions (unless the architecture can
> enforce through virtual address mapping non-posted write transactions
> behaviour) but writes to Configuration Space are not posted on the PCI
> express fabric.
> 
> Include the asm-generic ioremap_nopost() implementation (currently
> falling back to ioremap_nocache()) to provide a non-posted writes
> ioremap interface to kernel subsystems.
> 
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Niklas Cassel <nks@...wful.org>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>

For the CRIS-part:

Acked-by: Jesper Nilsson <jesper.nilsson@...s.com>

/^JN - Jesper Nilsson
-- 
               Jesper Nilsson -- jesper.nilsson@...s.com