linux-kernel - Re: [PATCH] soc: ti: k3-ringacc: Allow the driver to be built as module

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Date:   Tue, 25 Oct 2022 17:04:30 +0200
From:   Nicolas Frayer <nfrayer@...libre.com>
To:     Peter Ujfalusi <peter.ujfalusi@...il.com>
Cc:     nm@...com, ssantosh@...nel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, grygorii.strashko@...com,
        khilman@...libre.com
Subject: Re: [PATCH] soc: ti: k3-ringacc: Allow the driver to be built as module

Le ven. 21 oct. 2022 à 09:53, Peter Ujfalusi
<peter.ujfalusi@...il.com> a écrit :
>
> The ring accelerator driver can be built as module since all depending
> functions are exported.
>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...il.com>

Reviewed-by: Nicolas Frayer <nfrayer@...libre.com>
Tested-by: Nicolas Frayer <nfrayer@...libre.com>

> ---
>  drivers/soc/ti/Kconfig      |  2 +-
>  drivers/soc/ti/k3-ringacc.c | 29 ++++++++++++++++++++++++++---
>  2 files changed, 27 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig
> index 7e2fb1c16af1..e009d9589af4 100644
> --- a/drivers/soc/ti/Kconfig
> +++ b/drivers/soc/ti/Kconfig
> @@ -63,7 +63,7 @@ config TI_SCI_PM_DOMAINS
>           rootfs may be available.
>
>  config TI_K3_RINGACC
> -       bool "K3 Ring accelerator Sub System"
> +       tristate "K3 Ring accelerator Sub System"
>         depends on ARCH_K3 || COMPILE_TEST
>         depends on TI_SCI_INTA_IRQCHIP
>         help
> diff --git a/drivers/soc/ti/k3-ringacc.c b/drivers/soc/ti/k3-ringacc.c
> index f7bf18b8229a..e011412f2975 100644
> --- a/drivers/soc/ti/k3-ringacc.c
> +++ b/drivers/soc/ti/k3-ringacc.c
> @@ -7,7 +7,7 @@
>
>  #include <linux/dma-mapping.h>
>  #include <linux/io.h>
> -#include <linux/init.h>
> +#include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
>  #include <linux/platform_device.h>
> @@ -336,6 +336,11 @@ struct k3_ring *k3_ringacc_request_ring(struct k3_ringacc *ringacc,
>
>         mutex_lock(&ringacc->req_lock);
>
> +       if (!try_module_get(ringacc->dev->driver->owner)) {
> +               mutex_unlock(&ringacc->req_lock);
> +               return NULL;
> +       }
> +
>         if (id == K3_RINGACC_RING_ID_ANY) {
>                 /* Request for any general purpose ring */
>                 struct ti_sci_resource_desc *gp_rings =
> @@ -380,6 +385,7 @@ struct k3_ring *k3_ringacc_request_ring(struct k3_ringacc *ringacc,
>         return &ringacc->rings[id];
>
>  error:
> +       module_put(ringacc->dev->driver->owner);
>         mutex_unlock(&ringacc->req_lock);
>         return NULL;
>  }
> @@ -616,6 +622,8 @@ int k3_ringacc_ring_free(struct k3_ring *ring)
>  no_init:
>         clear_bit(ring->ring_id, ringacc->rings_inuse);
>
> +       module_put(ringacc->dev->driver->owner);
> +
>  out:
>         mutex_unlock(&ringacc->req_lock);
>         return 0;
> @@ -1450,6 +1458,7 @@ static const struct of_device_id k3_ringacc_of_match[] = {
>         { .compatible = "ti,am654-navss-ringacc", .data = &k3_ringacc_data, },
>         {},
>  };
> +MODULE_DEVICE_TABLE(of, k3_ringacc_of_match);
>
>  struct k3_ringacc *k3_ringacc_dmarings_init(struct platform_device *pdev,
>                                             struct k3_ringacc_init_data *data)
> @@ -1544,12 +1553,26 @@ static int k3_ringacc_probe(struct platform_device *pdev)
>         return 0;
>  }
>
> +static int k3_ringacc_remove(struct platform_device *pdev)
> +{
> +       struct k3_ringacc *ringacc = dev_get_drvdata(&pdev->dev);
> +
> +       mutex_lock(&k3_ringacc_list_lock);
> +       list_del(&ringacc->list);
> +       mutex_unlock(&k3_ringacc_list_lock);
> +       return 0;
> +}
> +
>  static struct platform_driver k3_ringacc_driver = {
>         .probe          = k3_ringacc_probe,
> +       .remove         = k3_ringacc_remove,
>         .driver         = {
>                 .name   = "k3-ringacc",
>                 .of_match_table = k3_ringacc_of_match,
> -               .suppress_bind_attrs = true,
>         },
>  };
> -builtin_platform_driver(k3_ringacc_driver);
> +module_platform_driver(k3_ringacc_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("TI Ringacc driver for K3 SOCs");
> +MODULE_AUTHOR("Grygorii Strashko <grygorii.strashko@...com>");
> --
> 2.38.1
>