From: "lihuisong (C)" <lihuisong@huawei.com>
To: <linux-acpi@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <rafael@kernel.org>, <sudeep.holla@arm.com>,
<rafael.j.wysocki@intel.com>, <wanghuiqiang@huawei.com>,
<huangdaode@huawei.com>, <tanxiaofei@huawei.com>,
Loc Ho <lho@apm.com>, Hoan Tran <hotran@apm.com>
Subject: Re: [RFC] ACPI: PCC: Support shared interrupt for multiple subspaces
Date: Wed, 26 Oct 2022 14:10:13 +0800 [thread overview]
Message-ID: <6d00d240-0c86-d593-6efe-44fec21421a8@huawei.com> (raw)
In-Reply-To: <20221016034043.52227-1-lihuisong@huawei.com>
Kindly ping.
在 2022/10/16 11:40, Huisong Li 写道:
> As ACPI protocol descripted, if interrupts are level, a GSIV may
> be shared by multiple subspaces, but each one must have unique
> platform interrupt ack preserve and ack set masks. Therefore, need
> set to shared interrupt for types that can distinguish interrupt
> response channel if platform interrupt mode is level triggered.
>
> The distinguishing point isn't definitely command complete register.
> Because the two status values of command complete indicate that
> there is no interrupt in a subspace('1' means subspace is free for
> use, and '0' means platform is processing the command). On the whole,
> the platform interrupt ack register is more suitable for this role.
> As ACPI protocol said, If the subspace does support interrupts, and
> these are level, this register must be supplied. And is used to clear
> the interrupt by using a read, modify, write sequence. This register
> is a 'WR' register, the bit corresponding to the subspace is '1' when
> the command is completed, or is '0'.
>
> Therefore, register shared interrupt for multiple subspaces if support
> platform interrupt ack register and interrupts are level, and read the
> ack register to ensure the idle or unfinished command channels to
> quickly return IRQ_NONE.
>
> Signed-off-by: Huisong Li <lihuisong@huawei.com>
> ---
> drivers/mailbox/pcc.c | 27 +++++++++++++++++++++++++--
> 1 file changed, 25 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
> index 3c2bc0ca454c..86c6cc44c73d 100644
> --- a/drivers/mailbox/pcc.c
> +++ b/drivers/mailbox/pcc.c
> @@ -100,6 +100,7 @@ struct pcc_chan_info {
> struct pcc_chan_reg cmd_update;
> struct pcc_chan_reg error;
> int plat_irq;
> + u8 plat_irq_trigger;
> };
>
> #define to_pcc_chan_info(c) container_of(c, struct pcc_chan_info, chan)
> @@ -236,6 +237,15 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p)
> int ret;
>
> pchan = chan->con_priv;
> + ret = pcc_chan_reg_read(&pchan->plat_irq_ack, &val);
> + if (ret)
> + return IRQ_NONE;
> + /* Irq ack GAS exist and check if this interrupt has the channel. */
> + if (pchan->plat_irq_ack.gas) {
> + val &= pchan->plat_irq_ack.set_mask;
> + if (val == 0)
> + return IRQ_NONE;
> + }
>
> ret = pcc_chan_reg_read(&pchan->cmd_complete, &val);
> if (ret)
> @@ -309,10 +319,21 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
> spin_unlock_irqrestore(&chan->lock, flags);
>
> if (pchan->plat_irq > 0) {
> + unsigned long irqflags;
> int rc;
>
> - rc = devm_request_irq(dev, pchan->plat_irq, pcc_mbox_irq, 0,
> - MBOX_IRQ_NAME, chan);
> + /*
> + * As ACPI protocol descripted, if interrupts are level, a GSIV
> + * may be shared by multiple subspaces.
> + * Therefore, register shared interrupt for multiple subspaces
> + * if support platform interrupt ack register and interrupts
> + * are level.
> + */
> + irqflags = (pchan->plat_irq_ack.gas &&
> + pchan->plat_irq_trigger == ACPI_LEVEL_SENSITIVE) ?
> + IRQF_SHARED : 0;
> + rc = devm_request_irq(dev, pchan->plat_irq, pcc_mbox_irq,
> + irqflags, MBOX_IRQ_NAME, chan);
> if (unlikely(rc)) {
> dev_err(dev, "failed to register PCC interrupt %d\n",
> pchan->plat_irq);
> @@ -457,6 +478,8 @@ static int pcc_parse_subspace_irq(struct pcc_chan_info *pchan,
> pcct_ss->platform_interrupt);
> return -EINVAL;
> }
> + pchan->plat_irq_trigger = (pcct_ss->flags & ACPI_PCCT_INTERRUPT_MODE) ?
> + ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
>
> if (pcct_ss->header.type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {
> struct acpi_pcct_hw_reduced_type2 *pcct2_ss = (void *)pcct_ss;
next prev parent reply other threads:[~2022-10-26 6:10 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-16 3:40 [RFC] ACPI: PCC: Support shared interrupt for multiple subspaces Huisong Li
2022-10-26 6:10 ` lihuisong (C) [this message]
2022-10-27 11:10 ` Sudeep Holla
2022-10-27 12:48 ` lihuisong (C)
2022-10-27 15:53 ` Sudeep Holla
2022-10-28 7:55 ` lihuisong (C)
2022-10-31 10:40 ` Sudeep Holla
2022-11-01 2:49 ` lihuisong (C)
2022-11-04 15:04 ` Robbie King
2022-11-04 15:15 ` Sudeep Holla
2022-11-04 15:39 ` Robbie King
2022-11-07 6:24 ` lihuisong (C)
2022-11-17 18:09 ` Robbie King
2022-11-19 7:32 ` lihuisong (C)
2022-11-21 16:59 ` Robbie King
2022-11-22 3:42 ` lihuisong (C)
2022-11-22 3:30 ` [RFC V2] " Huisong Li
2022-11-22 13:46 ` Sudeep Holla
2022-11-23 3:36 ` lihuisong (C)
2022-12-03 9:51 ` [RFC-V3 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Huisong Li
2022-12-03 9:51 ` [RFC-V3 1/2] mailbox: pcc: Add processing platform notification for slave subspaces Huisong Li
2023-02-06 15:39 ` Sudeep Holla
2023-02-07 2:27 ` lihuisong (C)
2023-02-13 21:18 ` Robbie King
2023-02-14 1:24 ` lihuisong (C)
2022-12-03 9:51 ` [RFC-V3 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2022-12-14 2:57 ` [RFC-V3 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt lihuisong (C)
2022-12-30 1:07 ` lihuisong (C)
2023-01-04 11:06 ` Sudeep Holla
2023-01-05 1:14 ` lihuisong (C)
2023-01-28 1:49 ` lihuisong (C)
2023-02-16 6:36 ` [PATCH " Huisong Li
2023-02-16 6:36 ` [PATCH 1/2] mailbox: pcc: Add processing platform notification for slave subspaces Huisong Li
2023-03-01 13:24 ` Sudeep Holla
2023-03-02 1:57 ` lihuisong (C)
2023-03-02 13:52 ` Sudeep Holla
2023-03-03 1:50 ` lihuisong (C)
2023-03-03 11:07 ` Sudeep Holla
2023-03-04 9:49 ` lihuisong (C)
2023-02-16 6:36 ` [PATCH 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-03-01 13:36 ` Sudeep Holla
2023-03-02 2:17 ` lihuisong (C)
2023-03-02 14:02 ` Sudeep Holla
[not found] ` <020cc964-9938-7ebe-7514-125cd041bfcb@huawei.com>
2023-03-03 11:14 ` Sudeep Holla
2023-03-04 9:47 ` lihuisong (C)
2023-03-10 20:14 ` Sudeep Holla
2023-03-14 1:05 ` lihuisong (C)
2023-02-27 13:09 ` [PATCH 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt lihuisong (C)
2023-03-14 11:11 ` [PATCH v2 " Huisong Li
2023-03-14 11:11 ` [PATCH v2 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-03-27 11:30 ` Sudeep Holla
2023-03-27 12:25 ` lihuisong (C)
2023-03-27 13:27 ` Sudeep Holla
2023-03-14 11:11 ` [PATCH v2 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-03-24 2:30 ` [PATCH v2 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt lihuisong (C)
2023-03-27 11:33 ` Sudeep Holla
2023-03-27 12:31 ` lihuisong (C)
2023-04-10 1:26 ` lihuisong (C)
2023-04-11 14:47 ` Robbie King
2023-04-14 1:05 ` lihuisong (C)
2023-04-14 13:48 ` Robbie King
2023-04-18 2:21 ` lihuisong (C)
2023-04-21 10:55 ` Sudeep Holla
2023-04-23 3:58 ` lihuisong (C)
2023-04-25 13:22 ` lihuisong (C)
2023-04-23 11:03 ` [PATCH v3 " Huisong Li
2023-04-23 11:03 ` [PATCH v3 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-04-23 11:03 ` [PATCH v3 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-04-25 14:41 ` [PATCH v3 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Sudeep Holla
2023-05-25 12:25 ` lihuisong (C)
2023-05-04 1:30 ` lihuisong (C)
2023-05-09 9:06 ` Sudeep Holla
2023-06-13 12:57 ` [PATCH v4 " Huisong Li
2023-06-13 12:57 ` [PATCH v4 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-06-13 12:57 ` [PATCH v4 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-06-14 15:58 ` [PATCH v4 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Sudeep Holla
2023-07-14 6:39 ` lihuisong (C)
2023-07-21 12:31 ` lihuisong (C)
2023-06-15 1:58 ` Hanjun Guo
2023-08-01 6:38 ` [PATCH RESEND " Huisong Li
2023-08-01 6:38 ` [PATCH RESEND v4 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-08-01 6:38 ` [PATCH RESEND v4 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-08-01 9:38 ` [PATCH RESEND v4 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Sudeep Holla
2023-08-09 11:44 ` lihuisong (C)
2023-08-17 6:50 ` lihuisong (C)
2023-08-26 2:40 ` lihuisong (C)
[not found] ` <AS8P193MB233566815E722D9B3B13B5EECAE2A@AS8P193MB2335.EURP193.PROD.OUTLOOK.COM>
2023-08-28 1:03 ` lihuisong (C)
2023-08-29 9:55 ` Sudeep Holla
2023-09-21 13:52 ` Sudeep Holla
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