From: Tomasz Nowicki <tn@semihalf.com>
To: Hanjun Guo <hanjun.guo@linaro.org>,
Marc Zyngier <marc.zyngier@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linuxarm@huawei.com,
Thomas Gleixner <tglx@linutronix.de>,
Greg KH <gregkh@linuxfoundation.org>,
Ma Jun <majun258@huawei.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Agustin Vega-Frias <agustinv@codeaurora.org>,
Sinan Kaya <okaya@codeaurora.org>,
charles.garcia-tobin@arm.com, huxinwei@huawei.com,
yimin@huawei.com, Jon Masters <jcm@redhat.com>
Subject: Re: [PATCH v6 05/14] ACPI: platform-msi: retrieve dev id from IORT
Date: Tue, 3 Jan 2017 09:43:21 +0100 [thread overview]
Message-ID: <13cb0c87-e1c0-c4d6-4793-a3edd20944dc@semihalf.com> (raw)
In-Reply-To: <1483363905-2806-6-git-send-email-hanjun.guo@linaro.org>
On 02.01.2017 14:31, Hanjun Guo wrote:
> For devices connecting to ITS, it needs dev id to identify
> itself, and this dev id is represented in the IORT table in
> named componant node [1] for platform devices, so in this
> patch we will scan the IORT to retrieve device's dev id.
>
> Introduce iort_pmsi_get_dev_id() with pointer dev passed
> in for that purpose.
>
> [1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf
>
> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
> Tested-by: Sinan Kaya <okaya@codeaurora.org>
> Tested-by: Majun <majun258@huawei.com>
> Tested-by: Xinwei Kong <kong.kongxinwei@hisilicon.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Tomasz Nowicki <tn@semihalf.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> ---
> drivers/acpi/arm64/iort.c | 26 ++++++++++++++++++++++++++
> drivers/irqchip/irq-gic-v3-its-platform-msi.c | 4 +++-
> include/linux/acpi_iort.h | 8 ++++++++
> 3 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 174e983..ab7bae7 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -444,6 +444,32 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id)
> }
>
> /**
> + * iort_pmsi_get_dev_id() - Get the device id for a device
> + * @dev: The device for which the mapping is to be done.
> + * @dev_id: The device ID found.
> + *
> + * Returns: 0 for successful find a dev id, errors otherwise
> + */
> +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
> +{
> + struct acpi_iort_node *node;
> +
> + if (!iort_table)
> + return -ENODEV;
> +
> + node = iort_find_dev_node(dev);
> + if (!node) {
> + dev_err(dev, "can't find related IORT node\n");
> + return -ENODEV;
> + }
> +
> + if(!iort_node_get_id(node, dev_id, IORT_MSI_TYPE, 0))
> + return -ENODEV;
> +
> + return 0;
> +}
> +
> +/**
Giving that you are extending this to NC->
SMMU->ITS case in later patch, we can use existing helpers from iort.c,
like that:
+/**
+ * iort_pmsi_get_dev_id() - Get the device id for a device
+ * @dev: The device for which the mapping is to be done.
+ * @dev_id: The device ID found.
+ *
+ * Returns: 0 for successful find a dev id, errors otherwise
+ */
+int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
+{
+ struct acpi_iort_node *node;
+
+ node = iort_find_dev_node(dev);
+ if (!node)
+ return -ENODEV;
+
+ if (!iort_node_map_rid(node, 0, dev_id, IORT_MSI_TYPE))
+ return -ENODEV;
+
+ return 0;
+}
Correct me if I am wrong.
Tomasz
next prev parent reply other threads:[~2017-01-03 8:43 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-02 13:31 [PATCH v6 00/14] ACPI platform MSI support and its example mbigen Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 01/14] ACPI: ARM64: IORT: minor cleanup for iort_match_node_callback() Hanjun Guo
2017-01-03 14:08 ` Lorenzo Pieralisi
2017-01-04 7:56 ` Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 02/14] irqchip: gic-v3-its: keep the head file include in alphabetic order Hanjun Guo
2017-01-11 10:20 ` Matthias Brugger
2017-01-11 10:20 ` Matthias Brugger
2017-01-11 14:16 ` Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 03/14] ACPI: ARM64: IORT: add missing comment for iort_dev_find_its_id() Hanjun Guo
2017-01-04 14:34 ` Lorenzo Pieralisi
2017-01-05 6:05 ` Hanjun Guo
2017-01-05 9:53 ` Lorenzo Pieralisi
2017-01-02 13:31 ` [PATCH v6 04/14] irqchip: gicv3-its: platform-msi: refactor its_pmsi_prepare() Hanjun Guo
2017-01-11 10:31 ` Matthias Brugger
2017-01-02 13:31 ` [PATCH v6 05/14] ACPI: platform-msi: retrieve dev id from IORT Hanjun Guo
2017-01-03 8:43 ` Tomasz Nowicki [this message]
2017-01-03 9:37 ` Tomasz Nowicki
2017-01-03 11:24 ` Tomasz Nowicki
2017-01-04 19:18 ` Lorenzo Pieralisi
2017-01-05 12:45 ` Hanjun Guo
2017-01-05 15:15 ` Lorenzo Pieralisi
2017-01-10 13:39 ` Hanjun Guo
2017-01-10 14:57 ` Lorenzo Pieralisi
2017-01-11 14:15 ` Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 06/14] irqchip: gicv3-its: platform-msi: refactor its_pmsi_init() to prepare for ACPI Hanjun Guo
2017-01-03 7:41 ` Tomasz Nowicki
2017-01-04 7:02 ` Hanjun Guo
2017-01-04 7:29 ` Tomasz Nowicki
2017-01-04 8:25 ` Hanjun Guo
2017-01-04 9:02 ` Marc Zyngier
2017-01-04 10:19 ` Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 07/14] irqchip: gicv3-its: platform-msi: scan MADT to create platform msi domain Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 08/14] ACPI: ARM64: IORT: rework iort_node_get_id() Hanjun Guo
2017-01-04 17:58 ` Lorenzo Pieralisi
2017-01-05 8:19 ` Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 09/14] ACPI: platform: setup MSI domain for ACPI based platform device Hanjun Guo
2017-01-02 21:17 ` Rafael J. Wysocki
2017-01-02 13:31 ` [PATCH v6 10/14] ACPI: ARM64: IORT: rework iort_node_get_id() for NC->SMMU->ITS case Hanjun Guo
2017-01-02 22:30 ` Sinan Kaya
2017-01-03 0:08 ` Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 11/14] msi: platform: make platform_msi_create_device_domain() ACPI aware Hanjun Guo
2017-01-04 16:49 ` Lorenzo Pieralisi
2017-01-02 13:31 ` [PATCH v6 12/14] irqchip: mbigen: drop module owner Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 13/14] irqchip: mbigen: introduce mbigen_of_create_domain() Hanjun Guo
2017-01-02 13:31 ` [PATCH v6 14/14] irqchip: mbigen: Add ACPI support Hanjun Guo
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