linux-kernel - Re: [PATCH v4 15/23] ata: ahci: Convert __ahci_port

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Date:   Tue, 14 Jun 2022 17:38:14 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.de>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Rob Herring <robh+dt@...nel.org>, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 15/23] ata: ahci: Convert __ahci_port_base to accepting
 hpriv as arguments

On 6/10/22 17:17, Serge Semin wrote:
> It may get required to retrieve the port-base address even before the

The port base address may be required even before the...

> ata_host instance is initialized and activated, for instance in the
> ahci_save_initial_config() method which we about to update (consider this

s/we/we are

> modification as a preparation for that one). Seeing the __ahci_port_base()
> function isn't used much it's the best candidate to provide the required
> functionality. So let's convert it to accepting the ahci_host_priv
> structure pointer.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Reviewed-by: Hannes Reinecke <hare@...e.de>
> ---
>  drivers/ata/ahci.c | 2 +-
>  drivers/ata/ahci.h | 7 ++++---
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> index 9bc8fa77e92f..d14d74649e0e 100644
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -689,7 +689,7 @@ static void ahci_pci_init_controller(struct ata_host *host)
>  			mv = 2;
>  		else
>  			mv = 4;
> -		port_mmio = __ahci_port_base(host, mv);
> +		port_mmio = __ahci_port_base(hpriv, mv);
>  
>  		writel(0, port_mmio + PORT_IRQ_MASK);
>  
> diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
> index 0e66446a5883..8b9826533ae5 100644
> --- a/drivers/ata/ahci.h
> +++ b/drivers/ata/ahci.h
> @@ -431,10 +431,9 @@ int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht);
>  void ahci_error_handler(struct ata_port *ap);
>  u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked);
>  
> -static inline void __iomem *__ahci_port_base(struct ata_host *host,
> +static inline void __iomem *__ahci_port_base(struct ahci_host_priv *hpriv,
>  					     unsigned int port_no)
>  {
> -	struct ahci_host_priv *hpriv = host->private_data;
>  	void __iomem *mmio = hpriv->mmio;
>  
>  	return mmio + 0x100 + (port_no * 0x80);
> @@ -442,7 +441,9 @@ static inline void __iomem *__ahci_port_base(struct ata_host *host,
>  
>  static inline void __iomem *ahci_port_base(struct ata_port *ap)
>  {
> -	return __ahci_port_base(ap->host, ap->port_no);
> +	struct ahci_host_priv *hpriv = ap->host->private_data;
> +
> +	return __ahci_port_base(hpriv, ap->port_no);
>  }
>  
>  static inline int ahci_nr_ports(u32 cap)


-- 
Damien Le Moal
Western Digital Research