Re: [PATCH v12 09/12] OF: PCI: Add support for parsing PCI host bridge resources from DT

[Liviu Dudau]

On Wed, Sep 24, 2014 at 06:31:09PM +0100, Bjorn Helgaas wrote:
> On Wed, Sep 24, 2014 at 05:43:04PM +0100, Liviu Dudau wrote:
> > Provide a function to parse the PCI DT ranges that can be used to
> > create a pci_host_bridge structure together with its associated
> > bus.
> > 
> > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> > Cc: Arnd Bergmann <arnd@xxxxxxxx>
> > Cc: Grant Likely <grant.likely@xxxxxxxxxx>
> > Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> > Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>
> > [make io_base parameter optional]
> > Signed-off-by: Robert Richter <rrichter@xxxxxxxxxx>
> > ---
> > Hi Bjorn,
> > 
> > I have fixed the compilation error that this patch was triggering. I
> > have validated that the patch applies to your pci/host-generic branch
> > as well as to my series.
> 
> I applied this to pci/host-generic along with the following patches and
> pushed the branch, thanks!

Thanks again and sorry for lack of thorough testing. I still haven't managed
to get a cross compiler for sparc and as I don't run Ubuntu or debian the
make.cross script doesn't work for me.

Best regards,
Liviu

> 
> Bjorn
> 
> >  drivers/of/of_pci.c    | 117 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/of_pci.h |   6 +++
> >  2 files changed, 123 insertions(+)
> > 
> > diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> > index 82d172f..3cad1af 100644
> > --- a/drivers/of/of_pci.c
> > +++ b/drivers/of/of_pci.c
> > @@ -1,7 +1,9 @@
> >  #include <linux/kernel.h>
> >  #include <linux/export.h>
> >  #include <linux/of.h>
> > +#include <linux/of_address.h>
> >  #include <linux/of_pci.h>
> > +#include <linux/slab.h>
> >  
> >  static inline int __of_pci_pci_compare(struct device_node *node,
> >  				       unsigned int data)
> > @@ -114,6 +116,121 @@ int of_get_pci_domain_nr(struct device_node *node)
> >  }
> >  EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
> >  
> > +#if defined(CONFIG_OF_ADDRESS)
> > +/**
> > + * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
> > + * @dev: device node of the host bridge having the range property
> > + * @busno: bus number associated with the bridge root bus
> > + * @bus_max: maximum number of busses for this bridge
> > + * @resources: list where the range of resources will be added after DT parsing
> > + * @io_base: pointer to a variable that will contain on return the physical
> > + * address for the start of the I/O range. Can be NULL if the caller doesn't
> > + * expect IO ranges to be present in the device tree.
> > + *
> > + * It is the callers job to free the @resources list.
> > + *
> > + * This function will parse the "ranges" property of a PCI host bridge device
> > + * node and setup the resource mapping based on its content. It is expected
> > + * that the property conforms with the Power ePAPR document.
> > + *
> > + * It returns zero if the range parsing has been successful or a standard error
> > + * value if it failed.
> > + */
> > +int of_pci_get_host_bridge_resources(struct device_node *dev,
> > +			unsigned char busno, unsigned char bus_max,
> > +			struct list_head *resources, resource_size_t *io_base)
> > +{
> > +	struct resource *res;
> > +	struct resource *bus_range;
> > +	struct of_pci_range range;
> > +	struct of_pci_range_parser parser;
> > +	char range_type[4];
> > +	int err;
> > +
> > +	if (io_base)
> > +		*io_base = (resource_size_t)OF_BAD_ADDR;
> > +
> > +	bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
> > +	if (!bus_range)
> > +		return -ENOMEM;
> > +
> > +	pr_info("PCI host bridge %s ranges:\n", dev->full_name);
> > +
> > +	err = of_pci_parse_bus_range(dev, bus_range);
> > +	if (err) {
> > +		bus_range->start = busno;
> > +		bus_range->end = bus_max;
> > +		bus_range->flags = IORESOURCE_BUS;
> > +		pr_info("  No bus range found for %s, using %pR\n",
> > +			dev->full_name, bus_range);
> > +	} else {
> > +		if (bus_range->end > bus_range->start + bus_max)
> > +			bus_range->end = bus_range->start + bus_max;
> > +	}
> > +	pci_add_resource(resources, bus_range);
> > +
> > +	/* Check for ranges property */
> > +	err = of_pci_range_parser_init(&parser, dev);
> > +	if (err)
> > +		goto parse_failed;
> > +
> > +	pr_debug("Parsing ranges property...\n");
> > +	for_each_of_pci_range(&parser, &range) {
> > +		/* Read next ranges element */
> > +		if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
> > +			snprintf(range_type, 4, " IO");
> > +		else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
> > +			snprintf(range_type, 4, "MEM");
> > +		else
> > +			snprintf(range_type, 4, "err");
> > +		pr_info("  %s %#010llx..%#010llx -> %#010llx\n", range_type,
> > +			range.cpu_addr, range.cpu_addr + range.size - 1,
> > +			range.pci_addr);
> > +
> > +		/*
> > +		 * If we failed translation or got a zero-sized region
> > +		 * then skip this range
> > +		 */
> > +		if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
> > +			continue;
> > +
> > +		res = kzalloc(sizeof(struct resource), GFP_KERNEL);
> > +		if (!res) {
> > +			err = -ENOMEM;
> > +			goto parse_failed;
> > +		}
> > +
> > +		err = of_pci_range_to_resource(&range, dev, res);
> > +		if (err)
> > +			goto conversion_failed;
> > +
> > +		if (resource_type(res) == IORESOURCE_IO) {
> > +			if (!io_base) {
> > +				pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
> > +					dev->full_name);
> > +				err = -EINVAL;
> > +				goto conversion_failed;
> > +			}
> > +			if (*io_base != (resource_size_t)OF_BAD_ADDR)
> > +				pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
> > +					dev->full_name);
> > +			*io_base = range.cpu_addr;
> > +		}
> > +
> > +		pci_add_resource_offset(resources, res,	res->start - range.pci_addr);
> > +	}
> > +
> > +	return 0;
> > +
> > +conversion_failed:
> > +	kfree(res);
> > +parse_failed:
> > +	pci_free_resource_list(resources);
> > +	return err;
> > +}
> > +EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
> > +#endif /* CONFIG_OF_ADDRESS */
> > +
> >  #ifdef CONFIG_PCI_MSI
> >  
> >  static LIST_HEAD(of_pci_msi_chip_list);
> > diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
> > index 71062e9..1fd207e 100644
> > --- a/include/linux/of_pci.h
> > +++ b/include/linux/of_pci.h
> > @@ -52,6 +52,12 @@ of_get_pci_domain_nr(struct device_node *node)
> >  }
> >  #endif
> >  
> > +#if defined(CONFIG_OF_ADDRESS)
> > +int of_pci_get_host_bridge_resources(struct device_node *dev,
> > +			unsigned char busno, unsigned char bus_max,
> > +			struct list_head *resources, resource_size_t *io_base);
> > +#endif
> > +
> >  #if defined(CONFIG_OF) && defined(CONFIG_PCI_MSI)
> >  int of_pci_msi_chip_add(struct msi_chip *chip);
> >  void of_pci_msi_chip_remove(struct msi_chip *chip);
> > -- 
> > 2.1.0
> > 
> > 
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    Â\_(ã)_/Â

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