linux-kernel - Re: [PATCH V4 5/7] irqchip, gicv3, its: Probe ITS in the ACPI way.

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Message-ID: <570F5C4F.30004@arm.com>
Date:	Thu, 14 Apr 2016 10:01:03 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Tomasz Nowicki <tn@...ihalf.com>, tglx@...utronix.de,
	jason@...edaemon.net, rjw@...ysocki.net, lorenzo.pieralisi@....com,
	robert.richter@...iumnetworks.com, shijie.huang@....com,
	Suravee.Suthikulpanit@....com, hanjun.guo@...aro.org
Cc:	al.stone@...aro.org, mw@...ihalf.com, graeme.gregory@...aro.org,
	Catalin.Marinas@....com, will.deacon@....com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, ddaney.cavm@...il.com,
	okaya@...eaurora.org
Subject: Re: [PATCH V4 5/7] irqchip, gicv3, its: Probe ITS in the ACPI way.

On 04/04/16 09:52, Tomasz Nowicki wrote:
> ITS is prepared for being initialized different than DT,
> therefore we can initialize it in ACPI way. We collect register base
> address from MADT table and pass mandatory info to firmware-agnostic
> ITS init call.
> 
> Note that we are using here IORT lib to register ITS domain which
> then can be found and used to build another PCI MSI domain
> in hierarchical stack domain.
> 
> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
> ---
>  drivers/irqchip/irq-gic-v3-its.c | 61 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 61 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 2dcc7b4..a277c9b 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -15,10 +15,13 @@
>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include <linux/acpi.h>
>  #include <linux/bitmap.h>
>  #include <linux/cpu.h>
>  #include <linux/delay.h>
>  #include <linux/interrupt.h>
> +#include <linux/irqdomain.h>
> +#include <linux/iort.h>
>  #include <linux/log2.h>
>  #include <linux/mm.h>
>  #include <linux/msi.h>
> @@ -1277,6 +1280,11 @@ static int its_irq_gic_domain_alloc(struct irq_domain *domain,
>  		fwspec.param[0] = GIC_IRQ_TYPE_LPI;
>  		fwspec.param[1] = hwirq;
>  		fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
> +	} else if (is_fwnode_irqchip(domain->parent->fwnode)) {
> +		fwspec.fwnode = domain->parent->fwnode;
> +		fwspec.param_count = 2;
> +		fwspec.param[0] = hwirq;
> +		fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
>  	} else {
>  		return -EINVAL;
>  	}
> @@ -1617,6 +1625,57 @@ its_of_probe(struct device_node *node, struct irq_domain *parent)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_ACPI
> +
> +#define ACPI_GICV3_ITS_MEM_SIZE (2 * SZ_64K)
> +
> +static struct irq_domain *its_parent __initdata;

Given that there is only one of those, maybe it is worth making it
common to DT and ACPI, and drop the parameter from its_probe_one.

> +
> +static int __init
> +gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
> +			const unsigned long end)
> +{
> +	struct acpi_madt_generic_translator *its_entry;
> +	struct fwnode_handle *domain_handle;
> +	int err;
> +
> +	its_entry = (struct acpi_madt_generic_translator *)header;
> +	domain_handle = irq_domain_alloc_fwnode((void *)its_entry->base_address);
> +	if (!domain_handle) {
> +		pr_err("Unable to allocate GICv3 ITS domain token\n");
> +		return -ENOMEM;
> +	}
> +
> +	err = iort_register_domain_token(its_entry->translation_id, domain_handle);
> +	if (err) {
> +		irq_domain_free_fwnode(domain_handle);
> +		goto out;
> +	}
> +
> +	err = its_probe_one(its_entry->base_address, ACPI_GICV3_ITS_MEM_SIZE,
> +			    its_parent, domain_handle);

struct resource.

> +	if (err) {
> +		iort_deregister_domain_token(its_entry->translation_id);
> +		irq_domain_free_fwnode(domain_handle);
> +	}
> +out:
> +	return err;
> +}
> +
> +void __init its_acpi_probe(struct irq_domain *parent_domain)
> +{
> +	int count;
> +
> +	its_parent = parent_domain;
> +	count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
> +				      gic_acpi_parse_madt_its, 0);
> +	if (count <= 0)
> +		pr_info("No valid GIC ITS entries exist\n");
> +}
> +#else
> +static inline void __init its_acpi_probe(struct irq_domain *parent_domain) { }
> +#endif
> +
>  int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
>  		    struct irq_domain *parent_domain)
>  {
> @@ -1625,6 +1684,8 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
>  	of_node = to_of_node(handle);
>  	if (of_node)
>  		its_of_probe(of_node, parent_domain);
> +	else
> +		its_acpi_probe(parent_domain);
>  
>  	if (list_empty(&its_nodes)) {
>  		pr_warn("ITS: No ITS available, not enabling LPIs\n");
> 

Thanks,

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