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Date:   Thu, 24 Mar 2022 12:13:37 -0500
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Pali =?iso-8859-1?Q?Roh=E1r?= <pali@kernel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Rob Herring <robh+dt@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
        Marek =?iso-8859-1?Q?Beh=FAn?= <kabel@kernel.org>,
        Russell King <rmk+kernel@armlinux.org.uk>,
        linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/4] PCI: Add function for parsing
 'slot-power-limit-milliwatt' DT property
Message-ID: <20220324171337.GA1458545@bhelgaas>
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On Wed, Mar 02, 2022 at 03:57:32PM +0100, Pali Roh?r wrote:
> Add function of_pci_get_slot_power_limit(), which parses the
> 'slot-power-limit-milliwatt' DT property, returning the value in
> milliwatts and in format ready for the PCIe Slot Capabilities Register.
> 
> Signed-off-by: Pali Roh?r <pali@kernel.org>
> Signed-off-by: Marek Beh?n <kabel@kernel.org>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
> Changes in v2:
> * Added support for PCIe 6.0 slot power limit encodings
> * Round down slot power limit value
> ---
>  drivers/pci/of.c  | 64 +++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/pci.h | 15 +++++++++++
>  2 files changed, 79 insertions(+)
> 
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index cb2e8351c2cc..549a404bd536 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -633,3 +633,67 @@ int of_pci_get_max_link_speed(struct device_node *node)
>  	return max_link_speed;
>  }
>  EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
> +
> +/**
> + * of_pci_get_slot_power_limit - Parses the "slot-power-limit-milliwatt"
> + *				 property.
> + *
> + * @node: device tree node with the slot power limit information
> + * @slot_power_limit_value: pointer where the value should be stored in PCIe
> + *			    Slot Capabilities Register format
> + * @slot_power_limit_scale: pointer where the scale should be stored in PCIe
> + *			    Slot Capabilities Register format
> + *
> + * Returns the slot power limit in milliwatts and if @slot_power_limit_value
> + * and @slot_power_limit_scale pointers are non-NULL, fills in the value and
> + * scale in format used by PCIe Slot Capabilities Register.
> + *
> + * If the property is not found or is invalid, returns 0.
> + */
> +u32 of_pci_get_slot_power_limit(struct device_node *node,
> +				u8 *slot_power_limit_value,
> +				u8 *slot_power_limit_scale)
> +{
> +	u32 slot_power_limit_mw;
> +	u8 value, scale;
> +
> +	if (of_property_read_u32(node, "slot-power-limit-milliwatt",
> +				 &slot_power_limit_mw))
> +		slot_power_limit_mw = 0;
> +
> +	/* Calculate Slot Power Limit Value and Slot Power Limit Scale */
> +	if (slot_power_limit_mw == 0) {
> +		value = 0x00;
> +		scale = 0;
> +	} else if (slot_power_limit_mw <= 255) {
> +		value = slot_power_limit_mw;
> +		scale = 3;
> +	} else if (slot_power_limit_mw <= 255*10) {
> +		value = slot_power_limit_mw / 10;
> +		scale = 2;
> +	} else if (slot_power_limit_mw <= 255*100) {
> +		value = slot_power_limit_mw / 100;
> +		scale = 1;
> +	} else if (slot_power_limit_mw <= 239*1000) {
> +		value = slot_power_limit_mw / 1000;
> +		scale = 0;
> +	} else if (slot_power_limit_mw <= 250*1000) {
> +		value = 0xF0;
> +		scale = 0;
> +	} else if (slot_power_limit_mw <= 600*1000) {
> +		value = 0xF0 + (slot_power_limit_mw / 1000 - 250) / 25;
> +		scale = 0;
> +	} else {
> +		value = 0xFF;
> +		scale = 0;

The purpose of this function is to return values that can be
programmed into the Slot Capabilities register.  The 0xFF Slot Power
Limit Value is reserved, and I don't think we should use it until the
spec defines a meaning for it.

If the DT tells us 800W is available, we'll put 0xFF in Slot Power
Limit Value.  If the spec eventually defines (0xFF, 0) to mean "1000W
available", a device may try to consume all 1000W, which will not
work.

If slot_power_limit_mw > 600*1000, I think we should advertise 600W
available (value 0xFE, scale 0) and return 600W (600*1000).

Bjorn