linux-kernel - Re: [PATCH v5 10/14] ACPI: ARM64: IORT: rework iort_node_get

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Date:   Fri, 30 Dec 2016 16:58:28 +0800
From:   Xinwei Kong <kong.kongxinwei@...ilicon.com>
To:     Hanjun Guo <guohanjun@...wei.com>,
        Marc Zyngier <marc.zyngier@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     Charles Garcia-Tobin <charles.garcia-tobin@....com>,
        <jcm@...hat.com>, <yimin@...wei.com>,
        Tomasz Nowicki <tn@...ihalf.com>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        <linux-acpi@...r.kernel.org>, Hanjun Guo <hanjun.guo@...aro.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Agustin Vega-Frias <agustinv@...eaurora.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 10/14] ACPI: ARM64: IORT: rework iort_node_get_id() for
 NC->SMMU->ITS case

On 2016/12/22 13:35, Hanjun Guo wrote:
> From: Hanjun Guo <hanjun.guo@...aro.org>
>
> iort_node_get_id() for now only support NC(named componant)->SMMU
> or NC->ITS cases, we also have other device topology such NC->
> SMMU->ITS, so rework iort_node_get_id() for those cases.
>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> ---
>   drivers/acpi/arm64/iort.c | 59 ++++++++++++++++++++++++++---------------------
>   1 file changed, 33 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 6b72fcb..9b3f268 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -292,22 +292,28 @@ static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
>   	return status;
>   }
>   
> -static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
> -		       u32 *rid_out)
> +static int iort_id_single_map(struct acpi_iort_id_mapping *map, u8 type,
> +			      u32 *rid_out)
>   {
>   	/* Single mapping does not care for input id */
>   	if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
>   		if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
>   		    type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
> -			*rid_out = map->output_base;
> +			if (rid_out)
> +				*rid_out = map->output_base;
>   			return 0;
>   		}
>   
>   		pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
>   			map, type);
> -		return -ENXIO;
>   	}
>   
> +	return -ENXIO;
> +}
> +
> +static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
> +		       u32 *rid_out)
> +{
>   	if (rid_in < map->input_base ||
>   	    (rid_in >= map->input_base + map->id_count))
>   		return -ENXIO;
> @@ -324,33 +330,34 @@ struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
>   	struct acpi_iort_node *parent;
>   	struct acpi_iort_id_mapping *map;
>   
> -	if (!node->mapping_offset || !node->mapping_count ||
> -				     index >= node->mapping_count)
> -		return NULL;
> -
> -	map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
> -			   node->mapping_offset);
> +	while (node) {
> +		if (!node->mapping_offset || !node->mapping_count ||
> +					     index >= node->mapping_count)
> +			return NULL;
>   
> -	/* Firmware bug! */
> -	if (!map->output_reference) {
> -		pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
> -		       node, node->type);
> -		return NULL;
> -	}
> +		map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
> +				   node->mapping_offset);
>   
> -	parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
> -			       map->output_reference);
> +		/* Firmware bug! */
> +		if (!map->output_reference) {
> +			pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
> +			       node, node->type);
> +			return NULL;
> +		}
>   
> -	if (!(IORT_TYPE_MASK(parent->type) & type_mask))
> -		return NULL;
> +		parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
> +				      map->output_reference);
>   
> -	if (map[index].flags & ACPI_IORT_ID_SINGLE_MAPPING) {
> -		if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
> -		    node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
> -			if (id_out)
> -				*id_out = map[index].output_base;
> -			return parent;
> +		/* go upstream to find its parent */
> +		if (!(IORT_TYPE_MASK(parent->type) & type_mask)) {
> +			node = parent;
> +			continue;
>   		}
> +
> +		if (iort_id_single_map(&map[index], node->type, id_out))
> +			break;
> +
> +		return parent;
>   	}
>   
>   	return NULL;
Tested-by:  Xinwei Kong <kong.kongxinwei@...ilicon.com>