linux-kernel - Re: [PATCH RESEND v3 03/11] staging: fsl-mc: Added generic MSI support for FSL-MC devices

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Message-ID: <56684EC6.9060101@arm.com>
Date:	Wed, 09 Dec 2015 15:54:46 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	"J. German Rivera" <German.Rivera@...escale.com>,
	gregkh@...uxfoundation.org, arnd@...db.de,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
CC:	stuart.yoder@...escale.com, itai.katz@...escale.com,
	lijun.pan@...escale.com, leoli@...escale.com,
	scottwood@...escale.com, agraf@...e.de, bhamciu1@...escale.com,
	R89243@...escale.com, bhupesh.sharma@...escale.com,
	nir.erez@...escale.com, richard.schmitt@...escale.com,
	dan.carpenter@...cle.com, jiang.liu@...ux.intel.com
Subject: Re: [PATCH RESEND v3 03/11] staging: fsl-mc: Added generic MSI support
 for FSL-MC devices

On 24/11/15 22:31, J. German Rivera wrote:
> Created an MSI domain for the fsl-mc bus-- including functions
> to create a domain, find a domain, alloc/free domain irqs, and
> bus specific overrides for domain and irq_chip ops.
> 
> Signed-off-by: J. German Rivera <German.Rivera@...escale.com>
> ---
> CHANGE HISTORY
> 
> Changes in v3:
> - Addressed comments from Marc Zyngier:
>   * Added WARN_ON in fsl_mc_msi_set_desc to check that caller does
>     not set set_desc
>   * Changed type of paddr in irq_cfg to be phys_addr_t
>   * Added WARN_ON in fsl_mc_msi_update_chip_op() to check that caller
>     does not set irq_write_msi_msg
> 
> Changes in v2: none
> 
>  drivers/staging/fsl-mc/bus/Kconfig          |   1 +
>  drivers/staging/fsl-mc/bus/Makefile         |   1 +
>  drivers/staging/fsl-mc/bus/mc-msi.c         | 285 ++++++++++++++++++++++++++++
>  drivers/staging/fsl-mc/include/dprc.h       |   2 +-
>  drivers/staging/fsl-mc/include/mc-private.h |  17 ++
>  drivers/staging/fsl-mc/include/mc.h         |  17 ++
>  6 files changed, 322 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/staging/fsl-mc/bus/mc-msi.c
> 

[...]

> diff --git a/drivers/staging/fsl-mc/bus/mc-msi.c b/drivers/staging/fsl-mc/bus/mc-msi.c
> new file mode 100644
> index 0000000..d6ac465
> --- /dev/null
> +++ b/drivers/staging/fsl-mc/bus/mc-msi.c

[...]

> +int fsl_mc_find_msi_domain(struct device_node *mc_of_node,
> +			   struct irq_domain **mc_msi_domain)
> +{
> +	struct device_node *msi_parent_node;
> +	struct irq_domain *msi_domain;
> +
> +	msi_parent_node = of_parse_phandle(mc_of_node, "msi-parent", 0);
> +	if (!msi_parent_node) {
> +		pr_err("msi-parent phandle missing for %s\n",
> +		       mc_of_node->full_name);
> +		return -ENOENT;
> +	}
> +
> +	/*
> +	 * Look up the fsl-mc MSI domain:
> +	 */
> +	msi_domain = irq_find_matching_host(msi_parent_node,
> +					    DOMAIN_BUS_FSL_MC_MSI);
> +	if (!msi_domain) {
> +		pr_err("Unable to find fsl-mc MSI domain for %s\n",
> +		       mc_of_node->full_name);
> +
> +		return -ENOENT;
> +	}
> +
> +	*mc_msi_domain = msi_domain;
> +	return 0;
> +}

We now have of_msi_get_domain() which does deal with this (and more). It
is probably worth investigating switching to it.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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