linux-kernel - Re: [PATCH v2 16/36] irqchip/gic-v4.1: Add mask/unmask doorbell callbacks

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Date:   Fri, 1 Nov 2019 19:23:37 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>, <kvmarm@...ts.cs.columbia.edu>,
        <linux-kernel@...r.kernel.org>
CC:     Eric Auger <eric.auger@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Andrew Murray" <Andrew.Murray@....com>,
        Jayachandran C <jnair@...vell.com>,
        "Robert Richter" <rrichter@...vell.com>
Subject: Re: [PATCH v2 16/36] irqchip/gic-v4.1: Add mask/unmask doorbell
 callbacks

Hi Marc,

On 2019/10/27 22:42, Marc Zyngier wrote:
> masking/unmasking doorbells on GICv4.1 relies on a new INVDB command,
> which broadcasts the invalidation to all RDs.
> 
> Implement the new command as well as the masking callbacks, and plug
> the whole thing into the v4.1 VPE irqchip.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>

Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>

> ---
>   drivers/irqchip/irq-gic-v3-its.c   | 60 ++++++++++++++++++++++++++++++
>   include/linux/irqchip/arm-gic-v3.h |  3 +-
>   2 files changed, 62 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index dcc7227af5f1..3c34bef70bdd 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -309,6 +309,10 @@ struct its_cmd_desc {
>   			u16 seq_num;
>   			u16 its_list;
>   		} its_vmovp_cmd;
> +
> +		struct {
> +			struct its_vpe *vpe;
> +		} its_invdb_cmd;
>   	};
>   };
>   
> @@ -750,6 +754,21 @@ static struct its_vpe *its_build_vmovp_cmd(struct its_node *its,
>   	return valid_vpe(its, desc->its_vmovp_cmd.vpe);
>   }
>   
> +static struct its_vpe *its_build_invdb_cmd(struct its_node *its,
> +					   struct its_cmd_block *cmd,
> +					   struct its_cmd_desc *desc)
> +{
> +	if (WARN_ON(!is_v4_1(its)))
> +		return NULL;
> +
> +	its_encode_cmd(cmd, GITS_CMD_INVDB);
> +	its_encode_vpeid(cmd, desc->its_invdb_cmd.vpe->vpe_id);
> +
> +	its_fixup_cmd(cmd);
> +
> +	return valid_vpe(its, desc->its_invdb_cmd.vpe);
> +}
> +
>   static u64 its_cmd_ptr_to_offset(struct its_node *its,
>   				 struct its_cmd_block *ptr)
>   {
> @@ -1117,6 +1136,14 @@ static void its_send_vinvall(struct its_node *its, struct its_vpe *vpe)
>   	its_send_single_vcommand(its, its_build_vinvall_cmd, &desc);
>   }
>   
> +static void its_send_invdb(struct its_node *its, struct its_vpe *vpe)
> +{
> +	struct its_cmd_desc desc;
> +
> +	desc.its_invdb_cmd.vpe = vpe;
> +	its_send_single_vcommand(its, its_build_invdb_cmd, &desc);
> +}
> +
>   /*
>    * irqchip functions - assumes MSI, mostly.
>    */
> @@ -3408,6 +3435,37 @@ static struct irq_chip its_vpe_irq_chip = {
>   	.irq_set_vcpu_affinity	= its_vpe_set_vcpu_affinity,
>   };
>   
> +static void its_vpe_4_1_send_inv(struct irq_data *d)
> +{
> +	struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
> +	struct its_node *its;
> +
> +	/*
> +	 * GICv4.1 wants doorbells to be invalidated using the
> +	 * INVDB command in order to be broadcast to all RDs. Send
> +	 * it to the first valid ITS, and let the HW do its magic.
> +	 */
> +	list_for_each_entry(its, &its_nodes, entry) {
> +		if (!is_v4_1(its))
> +			continue;
> +
> +		its_send_invdb(its, vpe);
> +		break;
> +	}

Maybe use find_4_1_its() helper instead?


Thanks,
Zenghui

> +}
> +
> +static void its_vpe_4_1_mask_irq(struct irq_data *d)
> +{
> +	lpi_write_config(d->parent_data, LPI_PROP_ENABLED, 0);
> +	its_vpe_4_1_send_inv(d);
> +}
> +
> +static void its_vpe_4_1_unmask_irq(struct irq_data *d)
> +{
> +	lpi_write_config(d->parent_data, 0, LPI_PROP_ENABLED);
> +	its_vpe_4_1_send_inv(d);
> +}
> +
>   static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
>   {
>   	struct its_cmd_info *info = vcpu_info;
> @@ -3429,6 +3487,8 @@ static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
>   
>   static struct irq_chip its_vpe_4_1_irq_chip = {
>   	.name			= "GICv4.1-vpe",
> +	.irq_mask		= its_vpe_4_1_mask_irq,
> +	.irq_unmask		= its_vpe_4_1_unmask_irq,
>   	.irq_eoi		= irq_chip_eoi_parent,
>   	.irq_set_affinity	= its_vpe_set_affinity,
>   	.irq_set_vcpu_affinity	= its_vpe_4_1_set_vcpu_affinity,
> diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
> index f1d6de53e09b..8157737053e4 100644
> --- a/include/linux/irqchip/arm-gic-v3.h
> +++ b/include/linux/irqchip/arm-gic-v3.h
> @@ -484,8 +484,9 @@
>   #define GITS_CMD_VMAPTI			GITS_CMD_GICv4(GITS_CMD_MAPTI)
>   #define GITS_CMD_VMOVI			GITS_CMD_GICv4(GITS_CMD_MOVI)
>   #define GITS_CMD_VSYNC			GITS_CMD_GICv4(GITS_CMD_SYNC)
> -/* VMOVP is the odd one, as it doesn't have a physical counterpart */
> +/* VMOVP and INVDB are the odd ones, as they dont have a physical counterpart */
>   #define GITS_CMD_VMOVP			GITS_CMD_GICv4(2)
> +#define GITS_CMD_INVDB			GITS_CMD_GICv4(0xe)
>   
>   /*
>    * ITS error numbers
>