linux-kernel - Re: [RFC PATCH 08/33] irqchip/gic-v3-its: Implement irq_set_irqchip

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Date:   Fri, 17 Feb 2017 07:15:41 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <marc.zyngier@....com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [RFC PATCH 08/33] irqchip/gic-v3-its: Implement
 irq_set_irqchip_state for pending state



On 17/01/2017 11:20, Marc Zyngier wrote:
> Allow the pending state of an LPI to be set or cleared via
> irq_set_irqchip_state.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>


Eric

> ---
>  drivers/irqchip/irq-gic-v3-its.c | 78 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 78 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 520b764..b28fb19 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -163,6 +163,11 @@ struct its_cmd_desc {
>  		struct {
>  			struct its_device *dev;
>  			u32 event_id;
> +		} its_clear_cmd;
> +
> +		struct {
> +			struct its_device *dev;
> +			u32 event_id;
>  		} its_int_cmd;
>  
>  		struct {
> @@ -376,6 +381,40 @@ static struct its_collection *its_build_inv_cmd(struct its_cmd_block *cmd,
>  	return col;
>  }
>  
> +static struct its_collection *its_build_int_cmd(struct its_cmd_block *cmd,
> +						struct its_cmd_desc *desc)
> +{
> +	struct its_collection *col;
> +
> +	col = dev_event_to_col(desc->its_int_cmd.dev,
> +			       desc->its_int_cmd.event_id);
> +
> +	its_encode_cmd(cmd, GITS_CMD_INT);
> +	its_encode_devid(cmd, desc->its_int_cmd.dev->device_id);
> +	its_encode_event_id(cmd, desc->its_int_cmd.event_id);
> +
> +	its_fixup_cmd(cmd);
> +
> +	return col;
> +}
> +
> +static struct its_collection *its_build_clear_cmd(struct its_cmd_block *cmd,
> +						  struct its_cmd_desc *desc)
> +{
> +	struct its_collection *col;
> +
> +	col = dev_event_to_col(desc->its_clear_cmd.dev,
> +			       desc->its_clear_cmd.event_id);
> +
> +	its_encode_cmd(cmd, GITS_CMD_CLEAR);
> +	its_encode_devid(cmd, desc->its_clear_cmd.dev->device_id);
> +	its_encode_event_id(cmd, desc->its_clear_cmd.event_id);
> +
> +	its_fixup_cmd(cmd);
> +
> +	return col;
> +}
> +
>  static struct its_collection *its_build_invall_cmd(struct its_cmd_block *cmd,
>  						   struct its_cmd_desc *desc)
>  {
> @@ -530,6 +569,26 @@ static void its_build_sync_cmd(struct its_cmd_block *sync_cmd,
>  static __its_send_single_cmd(its_send_single_command, its_cmd_builder_t,
>  			     struct its_collection, its_build_sync_cmd)
>  
> +static void its_send_int(struct its_device *dev, u32 event_id)
> +{
> +	struct its_cmd_desc desc;
> +
> +	desc.its_int_cmd.dev = dev;
> +	desc.its_int_cmd.event_id = event_id;
> +
> +	its_send_single_command(dev->its, its_build_int_cmd, &desc);
> +}
> +
> +static void its_send_clear(struct its_device *dev, u32 event_id)
> +{
> +	struct its_cmd_desc desc;
> +
> +	desc.its_clear_cmd.dev = dev;
> +	desc.its_clear_cmd.event_id = event_id;
> +
> +	its_send_single_command(dev->its, its_build_clear_cmd, &desc);
> +}
> +
>  static void its_send_inv(struct its_device *dev, u32 event_id)
>  {
>  	struct its_cmd_desc desc;
> @@ -693,6 +752,24 @@ static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
>  	iommu_dma_map_msi_msg(d->irq, msg);
>  }
>  
> +static int its_irq_set_irqchip_state(struct irq_data *d,
> +				     enum irqchip_irq_state which,
> +				     bool state)
> +{
> +	struct its_device *its_dev = irq_data_get_irq_chip_data(d);
> +	u32 event = its_get_event_id(d);
> +
> +	if (which != IRQCHIP_STATE_PENDING)
> +		return -EINVAL;
> +
> +	if (state)
> +		its_send_int(its_dev, event);
> +	else
> +		its_send_clear(its_dev, event);
> +
> +	return 0;
> +}
> +
>  static struct irq_chip its_irq_chip = {
>  	.name			= "ITS",
>  	.irq_mask		= its_mask_irq,
> @@ -700,6 +777,7 @@ static struct irq_chip its_irq_chip = {
>  	.irq_eoi		= irq_chip_eoi_parent,
>  	.irq_set_affinity	= its_set_affinity,
>  	.irq_compose_msi_msg	= its_irq_compose_msi_msg,
> +	.irq_set_irqchip_state	= its_irq_set_irqchip_state,
>  };
>  
>  /*
>