linux-kernel - Re: [PATCH v3 4/6] cxl/pci: Add RCH downstream port error logging

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Date:   Mon, 17 Apr 2023 17:56:55 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Terry Bowman <Terry.Bowman@....com>
CC:     <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>,
        <linux-cxl@...r.kernel.org>, <rrichter@....com>,
        <linux-kernel@...r.kernel.org>, <bhelgaas@...gle.com>
Subject: Re: [PATCH v3 4/6] cxl/pci: Add RCH downstream port error logging


> 
> >> +
> >> +	writel(aer_regs->uncor_status, aer_base + PCI_ERR_UNCOR_STATUS);
> >> +	writel(aer_regs->cor_status, aer_base + PCI_ERR_COR_STATUS);
> >> +
> >> +	return true;
> >> +}  
> > =  
> >> diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
> >> index bde1fffab09e..dfa6fcfc428a 100644
> >> --- a/drivers/cxl/core/regs.c
> >> +++ b/drivers/cxl/core/regs.c
> >> @@ -198,6 +198,7 @@ void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr,
> >>  
> >>  	return ret_val;
> >>  }
> >> +EXPORT_SYMBOL_NS_GPL(devm_cxl_iomap_block, CXL);
> >>  
> >>  int cxl_map_component_regs(struct device *dev, struct cxl_component_regs *regs,
> >>  			   struct cxl_register_map *map, unsigned long map_mask)
> >> diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
> >> index df64c402e6e6..dae3f141ffcb 100644
> >> --- a/drivers/cxl/cxl.h
> >> +++ b/drivers/cxl/cxl.h
> >> @@ -66,6 +66,8 @@
> >>  #define CXL_DECODER_MIN_GRANULARITY 256
> >>  #define CXL_DECODER_MAX_ENCODED_IG 6
> >>  
> >> +#define PCI_AER_CAPABILITY_LENGTH 56  
> > 
> > Odd place to find a PCI specific define. Also a spec reference is
> > always good for these.  What's the the length of? PCI r6.0 has
> > cap going up to address 0x5c  so length 0x60.  This seems to be igoring
> > the header log register.
> >  
> 
> This was to avoid including the TLP log at 0x38+.
> 
> I can use sizeof(struct aer_capability_regs) or sizeof(*aer_regs) instead. 
> It's the same 38h(56) and will allow me to remove this #define in the 
> patchset revision.

That works better than a define that people might think is more generic.
Otherwise you get PCI_AER_CAP_WITHOUT_TLP_LOG_LENGTH or
something equally horrible. (or define the TLP_LOG length as another
define and subtract that?)

>