linux-kernel - RE: [PATCH v10 12/15] cxl/pci: Disable root port interrupts in RCH mode

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Date:   Fri, 15 Sep 2023 11:43:46 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Terry Bowman <terry.bowman@....com>, <alison.schofield@...el.com>,
        <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <dave.jiang@...el.com>, <Jonathan.Cameron@...wei.com>,
        <linux-cxl@...r.kernel.org>
CC:     <terry.bowman@....com>, <rrichter@....com>,
        <linux-kernel@...r.kernel.org>, <bhelgaas@...gle.com>
Subject: RE: [PATCH v10 12/15] cxl/pci: Disable root port interrupts in RCH
 mode

Terry Bowman wrote:
> The RCH root port contains root command AER registers that should not be
> enabled.[1] Disable these to prevent root port interrupts.
> 
> [1] CXL 3.0 - 12.2.1.1 RCH Downstream Port-detected Errors
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Signed-off-by: Robert Richter <rrichter@....com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
[..]
> diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
> index 2a22a7ed4704..d195af72ed65 100644
> --- a/drivers/cxl/core/port.c
> +++ b/drivers/cxl/core/port.c
> @@ -1042,6 +1042,9 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev,
>  
>  	cxl_dport_map_regs(dport);
>  
> +	if (dport->rch)
> +		cxl_disable_rch_root_ints(dport);
> +

Similar to the comment about cxl_dport_map_regs() not being appropriate
in an enumeration routine, this also needs to move out of _add_dport. It
occurs to me that it should also be undone on driver detach just like
other device "enables".