Re: [PATCH v3 19/25] PCI: of: Add inbound resource parsing to helpers

[Robin Murphy <robin.murphy@arm.com>]

On 30/10/2019 11:48, Lorenzo Pieralisi wrote:
> [+Cc Robin]
> 
> On Wed, Oct 30, 2019 at 12:14:54PM +0530, Srinath Mannam wrote:
>> Hi Lorenzo,
>>
>> Thanks for the details.
>> Based on Robin's comment in the old patch, I thought dma_ranges list
>> will be in sorted order.
>> https://lore.kernel.org/lkml/741a4210-251c-9c00-d4a7-bc7ebf8cd57b@arm.com/
>>
>> Now, another patch is required to sort the list before reserving in
>> iova_reserve_pci_windows() function.
>>
>> Regards,
>> Srinath.
> 
> Don't top-post please.
> 
> https://en.wikipedia.org/wiki/Posting_style#Top-posting
> 
> Yes, the dma_ranges list must be sorted somehow I reckon
> iova_reserve_pci_windows() is where it should be done (since that's
> where the requirement is) or it can be done in
> devm_of_pci_get_host_bridge_resources().
> 
> Thoughts ?

Right, strictly it's only iova_reserve_pci_windows() that needs the list 
sorted, it just worked out that maintaining the list in sorted order by 
construction took a fair bit less code than explicitly sorting it. In 
terms of preserving that behaviour in a slightly more generalised 
fashion I suppose we could add something like:

void pci_add_resource_offset_sorted(struct list_head *resources,
				struct resource *res,
				resource_size_t offset)
{
	struct resource_entry *entry;

	resource_list_for_each_entry(entry, resources)
		if (entry->res.start > res.start)
			break;
	
	pci_add_resource_offset(&entry->node, res, offset);
}

but if you'd rather add a specific resource_list_sort() or even just 
open-code it in iommu-dma, I don't have any real preference. The "least 
code necessary" approach definitely made sense when individual drivers 
were expected to build their own lists, but once it gets generalised 
then having a sensible and robust API becomes a more important 
consideration.

Robin.

> 
> Lorenzo
> 
>> On Tue, Oct 29, 2019 at 11:04 PM Lorenzo Pieralisi
>> <lorenzo.pieralisi@arm.com> wrote:
>>>
>>> On Tue, Oct 29, 2019 at 09:26:51PM +0530, Srinath Mannam wrote:
>>>> Hi Lorenzo,
>>>>
>>>> All changes are looks good to me.
>>>> I have one doubt regarding, resources added in the
>>>> "bridge->dma_ranges" list are expected to be in sorted order which are
>>>> used in "iova_reserve_pci_windows". Please correct me if I missed any
>>>> patch specific to this.
>>>
>>> No I don't think so, it is just that we need to decide which piece of
>>> code should sort that list, whether in this patchset or by patching the
>>> kernel in iova_reserve_pci_windows().
>>>
>>> I tend to think the sorting should be done in iova_reserve_pci_windows()
>>> because that's where the requirement is.
>>>
>>> Lorenzo
>>>
>>>> Regards,
>>>> Srinath.
>>>>
>>>> On Tue, Oct 29, 2019 at 4:37 PM Lorenzo Pieralisi
>>>> <lorenzo.pieralisi@arm.com> wrote:
>>>>>
>>>>> On Mon, Oct 28, 2019 at 11:32:50AM -0500, Rob Herring wrote:
>>>>>> Extend devm_of_pci_get_host_bridge_resources() and
>>>>>> pci_parse_request_of_pci_ranges() helpers to also parse the inbound
>>>>>> addresses from DT 'dma-ranges' and populate a resource list with the
>>>>>> translated addresses. This will help ensure 'dma-ranges' is always
>>>>>> parsed in a consistent way.
>>>>>>
>>>>>> Cc: Jingoo Han <jingoohan1@gmail.com>
>>>>>> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
>>>>>> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
>>>>>> Cc: Bjorn Helgaas <bhelgaas@google.com>
>>>>>> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
>>>>>> Cc: Will Deacon <will@kernel.org>
>>>>>> Cc: Linus Walleij <linus.walleij@linaro.org>
>>>>>> Cc: Toan Le <toan@os.amperecomputing.com>
>>>>>> Cc: Ley Foon Tan <lftan@altera.com>
>>>>>> Cc: Tom Joseph <tjoseph@cadence.com>
>>>>>> Cc: Ray Jui <rjui@broadcom.com>
>>>>>> Cc: Scott Branden <sbranden@broadcom.com>
>>>>>> Cc: bcm-kernel-feedback-list@broadcom.com
>>>>>> Cc: Ryder Lee <ryder.lee@mediatek.com>
>>>>>> Cc: Karthikeyan Mitran <m.karthikeyan@mobiveil.co.in>
>>>>>> Cc: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>>>>>> Cc: Simon Horman <horms@verge.net.au>
>>>>>> Cc: Shawn Lin <shawn.lin@rock-chips.com>
>>>>>> Cc: Heiko Stuebner <heiko@sntech.de>
>>>>>> Cc: Michal Simek <michal.simek@xilinx.com>
>>>>>> Cc: rfi@lists.rocketboards.org
>>>>>> Cc: linux-mediatek@lists.infradead.org
>>>>>> Cc: linux-renesas-soc@vger.kernel.org
>>>>>> Cc: linux-rockchip@lists.infradead.org
>>>>>> Tested-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> # for AArdvark
>>>>>> Reviewed-by: Andrew Murray <andrew.murray@arm.com>
>>>>>> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
>>>>>> Signed-off-by: Rob Herring <robh@kernel.org>
>>>>>> ---
>>>>>> v2:
>>>>>>   - Fix crash in INIT_LIST_HEAD when ib_resources is NULL
>>>>>> ---
>>>>>>   .../pci/controller/dwc/pcie-designware-host.c |  3 +-
>>>>>>   drivers/pci/controller/pci-aardvark.c         |  2 +-
>>>>>>   drivers/pci/controller/pci-ftpci100.c         |  3 +-
>>>>>>   drivers/pci/controller/pci-host-common.c      |  2 +-
>>>>>>   drivers/pci/controller/pci-v3-semi.c          |  3 +-
>>>>>>   drivers/pci/controller/pci-versatile.c        |  3 +-
>>>>>>   drivers/pci/controller/pci-xgene.c            |  3 +-
>>>>>>   drivers/pci/controller/pcie-altera.c          |  2 +-
>>>>>>   drivers/pci/controller/pcie-cadence-host.c    |  2 +-
>>>>>>   drivers/pci/controller/pcie-iproc-platform.c  |  3 +-
>>>>>>   drivers/pci/controller/pcie-mediatek.c        |  2 +-
>>>>>>   drivers/pci/controller/pcie-mobiveil.c        |  3 +-
>>>>>>   drivers/pci/controller/pcie-rcar.c            |  3 +-
>>>>>>   drivers/pci/controller/pcie-rockchip-host.c   |  3 +-
>>>>>>   drivers/pci/controller/pcie-xilinx-nwl.c      |  3 +-
>>>>>>   drivers/pci/controller/pcie-xilinx.c          |  3 +-
>>>>>>   drivers/pci/of.c                              | 45 ++++++++++++++++++-
>>>>>>   drivers/pci/pci.h                             |  8 +++-
>>>>>>   include/linux/pci.h                           |  9 ++--
>>>>>>   19 files changed, 82 insertions(+), 23 deletions(-)
>>>>>
>>>>> Hi Bjorn,
>>>>>
>>>>> please let me know if you are OK with this patch, the series is
>>>>> ready to go upstream IMO.
>>>>>
>>>>> Thanks,
>>>>> Lorenzo
>>>>>
>>>>>> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
>>>>>> index aeec8b65eb97..f7b1d80c4a0a 100644
>>>>>> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>>>>>> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>>>>>> @@ -342,7 +342,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
>>>>>>        if (!bridge)
>>>>>>                return -ENOMEM;
>>>>>>
>>>>>> -     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
>>>>>> +     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (ret)
>>>>>>                return ret;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
>>>>>> index 9cbeba507f0c..b34eaa2cd762 100644
>>>>>> --- a/drivers/pci/controller/pci-aardvark.c
>>>>>> +++ b/drivers/pci/controller/pci-aardvark.c
>>>>>> @@ -939,7 +939,7 @@ static int advk_pcie_probe(struct platform_device *pdev)
>>>>>>        }
>>>>>>
>>>>>>        ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> -                                           &bus);
>>>>>> +                                           &bridge->dma_ranges, &bus);
>>>>>>        if (ret) {
>>>>>>                dev_err(dev, "Failed to parse resources\n");
>>>>>>                return ret;
>>>>>> diff --git a/drivers/pci/controller/pci-ftpci100.c b/drivers/pci/controller/pci-ftpci100.c
>>>>>> index 75603348b88a..66288b94e92d 100644
>>>>>> --- a/drivers/pci/controller/pci-ftpci100.c
>>>>>> +++ b/drivers/pci/controller/pci-ftpci100.c
>>>>>> @@ -477,7 +477,8 @@ static int faraday_pci_probe(struct platform_device *pdev)
>>>>>>        if (IS_ERR(p->base))
>>>>>>                return PTR_ERR(p->base);
>>>>>>
>>>>>> -     ret = pci_parse_request_of_pci_ranges(dev, &host->windows, NULL);
>>>>>> +     ret = pci_parse_request_of_pci_ranges(dev, &host->windows,
>>>>>> +                                           &host->dma_ranges, NULL);
>>>>>>        if (ret)
>>>>>>                return ret;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
>>>>>> index c8cb9c5188a4..250a3fc80ec6 100644
>>>>>> --- a/drivers/pci/controller/pci-host-common.c
>>>>>> +++ b/drivers/pci/controller/pci-host-common.c
>>>>>> @@ -27,7 +27,7 @@ static struct pci_config_window *gen_pci_init(struct device *dev,
>>>>>>        struct pci_config_window *cfg;
>>>>>>
>>>>>>        /* Parse our PCI ranges and request their resources */
>>>>>> -     err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
>>>>>> +     err = pci_parse_request_of_pci_ranges(dev, resources, NULL, &bus_range);
>>>>>>        if (err)
>>>>>>                return ERR_PTR(err);
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pci-v3-semi.c b/drivers/pci/controller/pci-v3-semi.c
>>>>>> index 96677520f6c1..2209c7671115 100644
>>>>>> --- a/drivers/pci/controller/pci-v3-semi.c
>>>>>> +++ b/drivers/pci/controller/pci-v3-semi.c
>>>>>> @@ -776,7 +776,8 @@ static int v3_pci_probe(struct platform_device *pdev)
>>>>>>        if (IS_ERR(v3->config_base))
>>>>>>                return PTR_ERR(v3->config_base);
>>>>>>
>>>>>> -     ret = pci_parse_request_of_pci_ranges(dev, &host->windows, NULL);
>>>>>> +     ret = pci_parse_request_of_pci_ranges(dev, &host->windows,
>>>>>> +                                           &host->dma_ranges, NULL);
>>>>>>        if (ret)
>>>>>>                return ret;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pci-versatile.c b/drivers/pci/controller/pci-versatile.c
>>>>>> index eae1b859990b..b911359b6d81 100644
>>>>>> --- a/drivers/pci/controller/pci-versatile.c
>>>>>> +++ b/drivers/pci/controller/pci-versatile.c
>>>>>> @@ -92,7 +92,8 @@ static int versatile_pci_probe(struct platform_device *pdev)
>>>>>>        if (IS_ERR(versatile_cfg_base[1]))
>>>>>>                return PTR_ERR(versatile_cfg_base[1]);
>>>>>>
>>>>>> -     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
>>>>>> +     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           NULL, NULL);
>>>>>>        if (ret)
>>>>>>                return ret;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
>>>>>> index 7d0f0395a479..9408269d943d 100644
>>>>>> --- a/drivers/pci/controller/pci-xgene.c
>>>>>> +++ b/drivers/pci/controller/pci-xgene.c
>>>>>> @@ -627,7 +627,8 @@ static int xgene_pcie_probe(struct platform_device *pdev)
>>>>>>        if (ret)
>>>>>>                return ret;
>>>>>>
>>>>>> -     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
>>>>>> +     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (ret)
>>>>>>                return ret;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
>>>>>> index ba025efeae28..b447c3e4abad 100644
>>>>>> --- a/drivers/pci/controller/pcie-altera.c
>>>>>> +++ b/drivers/pci/controller/pcie-altera.c
>>>>>> @@ -800,7 +800,7 @@ static int altera_pcie_probe(struct platform_device *pdev)
>>>>>>        }
>>>>>>
>>>>>>        ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> -                                           NULL);
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (ret) {
>>>>>>                dev_err(dev, "Failed add resources\n");
>>>>>>                return ret;
>>>>>> diff --git a/drivers/pci/controller/pcie-cadence-host.c b/drivers/pci/controller/pcie-cadence-host.c
>>>>>> index 97e251090b4f..a8f7a6284c3e 100644
>>>>>> --- a/drivers/pci/controller/pcie-cadence-host.c
>>>>>> +++ b/drivers/pci/controller/pcie-cadence-host.c
>>>>>> @@ -211,7 +211,7 @@ static int cdns_pcie_host_init(struct device *dev,
>>>>>>        int err;
>>>>>>
>>>>>>        /* Parse our PCI ranges and request their resources */
>>>>>> -     err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
>>>>>> +     err = pci_parse_request_of_pci_ranges(dev, resources, NULL, &bus_range);
>>>>>>        if (err)
>>>>>>                return err;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pcie-iproc-platform.c b/drivers/pci/controller/pcie-iproc-platform.c
>>>>>> index 375d815f7301..ff0a81a632a1 100644
>>>>>> --- a/drivers/pci/controller/pcie-iproc-platform.c
>>>>>> +++ b/drivers/pci/controller/pcie-iproc-platform.c
>>>>>> @@ -95,7 +95,8 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
>>>>>>        if (IS_ERR(pcie->phy))
>>>>>>                return PTR_ERR(pcie->phy);
>>>>>>
>>>>>> -     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
>>>>>> +     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (ret) {
>>>>>>                dev_err(dev, "unable to get PCI host bridge resources\n");
>>>>>>                return ret;
>>>>>> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
>>>>>> index d9206a3cd56b..cb982891b22b 100644
>>>>>> --- a/drivers/pci/controller/pcie-mediatek.c
>>>>>> +++ b/drivers/pci/controller/pcie-mediatek.c
>>>>>> @@ -1034,7 +1034,7 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
>>>>>>        int err;
>>>>>>
>>>>>>        err = pci_parse_request_of_pci_ranges(dev, windows,
>>>>>> -                                           &bus);
>>>>>> +                                           &host->dma_ranges, &bus);
>>>>>>        if (err)
>>>>>>                return err;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c
>>>>>> index 4eab8624ce4d..257ba49c177c 100644
>>>>>> --- a/drivers/pci/controller/pcie-mobiveil.c
>>>>>> +++ b/drivers/pci/controller/pcie-mobiveil.c
>>>>>> @@ -875,7 +875,8 @@ static int mobiveil_pcie_probe(struct platform_device *pdev)
>>>>>>        }
>>>>>>
>>>>>>        /* parse the host bridge base addresses from the device tree file */
>>>>>> -     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
>>>>>> +     ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (ret) {
>>>>>>                dev_err(dev, "Getting bridge resources failed\n");
>>>>>>                return ret;
>>>>>> diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c
>>>>>> index f6a669a9af41..b8d6e86a5539 100644
>>>>>> --- a/drivers/pci/controller/pcie-rcar.c
>>>>>> +++ b/drivers/pci/controller/pcie-rcar.c
>>>>>> @@ -1138,7 +1138,8 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>>>>>>        pcie->dev = dev;
>>>>>>        platform_set_drvdata(pdev, pcie);
>>>>>>
>>>>>> -     err = pci_parse_request_of_pci_ranges(dev, &pcie->resources, NULL);
>>>>>> +     err = pci_parse_request_of_pci_ranges(dev, &pcie->resources,
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (err)
>>>>>>                goto err_free_bridge;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pcie-rockchip-host.c b/drivers/pci/controller/pcie-rockchip-host.c
>>>>>> index f375e55ea02e..ee83f8494ee9 100644
>>>>>> --- a/drivers/pci/controller/pcie-rockchip-host.c
>>>>>> +++ b/drivers/pci/controller/pcie-rockchip-host.c
>>>>>> @@ -1004,7 +1004,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>>>>>>        if (err < 0)
>>>>>>                goto err_deinit_port;
>>>>>>
>>>>>> -     err = pci_parse_request_of_pci_ranges(dev, &bridge->windows, &bus_res);
>>>>>> +     err = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           &bridge->dma_ranges, &bus_res);
>>>>>>        if (err)
>>>>>>                goto err_remove_irq_domain;
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
>>>>>> index e135a4b60489..9bd1427f2fd6 100644
>>>>>> --- a/drivers/pci/controller/pcie-xilinx-nwl.c
>>>>>> +++ b/drivers/pci/controller/pcie-xilinx-nwl.c
>>>>>> @@ -843,7 +843,8 @@ static int nwl_pcie_probe(struct platform_device *pdev)
>>>>>>                return err;
>>>>>>        }
>>>>>>
>>>>>> -     err = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
>>>>>> +     err = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (err) {
>>>>>>                dev_err(dev, "Getting bridge resources failed\n");
>>>>>>                return err;
>>>>>> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
>>>>>> index 257702288787..98e55297815b 100644
>>>>>> --- a/drivers/pci/controller/pcie-xilinx.c
>>>>>> +++ b/drivers/pci/controller/pcie-xilinx.c
>>>>>> @@ -645,7 +645,8 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
>>>>>>                return err;
>>>>>>        }
>>>>>>
>>>>>> -     err = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
>>>>>> +     err = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>>>>>> +                                           &bridge->dma_ranges, NULL);
>>>>>>        if (err) {
>>>>>>                dev_err(dev, "Getting bridge resources failed\n");
>>>>>>                return err;
>>>>>> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
>>>>>> index f3da49a31db4..0b1e4623dfcf 100644
>>>>>> --- a/drivers/pci/of.c
>>>>>> +++ b/drivers/pci/of.c
>>>>>> @@ -257,7 +257,9 @@ EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
>>>>>>    */
>>>>>>   int devm_of_pci_get_host_bridge_resources(struct device *dev,
>>>>>>                        unsigned char busno, unsigned char bus_max,
>>>>>> -                     struct list_head *resources, resource_size_t *io_base)
>>>>>> +                     struct list_head *resources,
>>>>>> +                     struct list_head *ib_resources,
>>>>>> +                     resource_size_t *io_base)
>>>>>>   {
>>>>>>        struct device_node *dev_node = dev->of_node;
>>>>>>        struct resource *res, tmp_res;
>>>>>> @@ -340,6 +342,42 @@ int devm_of_pci_get_host_bridge_resources(struct device *dev,
>>>>>>                pci_add_resource_offset(resources, res, res->start - range.pci_addr);
>>>>>>        }
>>>>>>
>>>>>> +     /* Check for dma-ranges property */
>>>>>> +     if (!ib_resources)
>>>>>> +             return 0;
>>>>>> +     err = of_pci_dma_range_parser_init(&parser, dev_node);
>>>>>> +     if (err)
>>>>>> +             return 0;
>>>>>> +
>>>>>> +     dev_dbg(dev, "Parsing dma-ranges property...\n");
>>>>>> +     for_each_of_pci_range(&parser, &range) {
>>>>>> +             /*
>>>>>> +              * If we failed translation or got a zero-sized region
>>>>>> +              * then skip this range
>>>>>> +              */
>>>>>> +             if (((range.flags & IORESOURCE_TYPE_BITS) != IORESOURCE_MEM) ||
>>>>>> +                 range.cpu_addr == OF_BAD_ADDR || range.size == 0)
>>>>>> +                     continue;
>>>>>> +
>>>>>> +             dev_info(dev, "IB MEM %#010llx..%#010llx -> %#010llx\n",
>>>>>> +                      range.cpu_addr,
>>>>>> +                      range.cpu_addr + range.size - 1, range.pci_addr);
>>>>>> +
>>>>>> +
>>>>>> +             err = of_pci_range_to_resource(&range, dev_node, &tmp_res);
>>>>>> +             if (err)
>>>>>> +                     continue;
>>>>>> +
>>>>>> +             res = devm_kmemdup(dev, &tmp_res, sizeof(tmp_res), GFP_KERNEL);
>>>>>> +             if (!res) {
>>>>>> +                     err = -ENOMEM;
>>>>>> +                     goto failed;
>>>>>> +             }
>>>>>> +
>>>>>> +             pci_add_resource_offset(ib_resources, res,
>>>>>> +                                     res->start - range.pci_addr);
>>>>>> +     }
>>>>>> +
>>>>>>        return 0;
>>>>>>
>>>>>>   failed:
>>>>>> @@ -482,6 +520,7 @@ EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci);
>>>>>>
>>>>>>   int pci_parse_request_of_pci_ranges(struct device *dev,
>>>>>>                                    struct list_head *resources,
>>>>>> +                                 struct list_head *ib_resources,
>>>>>>                                    struct resource **bus_range)
>>>>>>   {
>>>>>>        int err, res_valid = 0;
>>>>>> @@ -489,8 +528,10 @@ int pci_parse_request_of_pci_ranges(struct device *dev,
>>>>>>        struct resource_entry *win, *tmp;
>>>>>>
>>>>>>        INIT_LIST_HEAD(resources);
>>>>>> +     if (ib_resources)
>>>>>> +             INIT_LIST_HEAD(ib_resources);
>>>>>>        err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, resources,
>>>>>> -                                                 &iobase);
>>>>>> +                                                 ib_resources, &iobase);
>>>>>>        if (err)
>>>>>>                return err;
>>>>>>
>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
>>>>>> index 3f6947ee3324..6692c4fe4290 100644
>>>>>> --- a/drivers/pci/pci.h
>>>>>> +++ b/drivers/pci/pci.h
>>>>>> @@ -633,11 +633,15 @@ static inline void pci_release_bus_of_node(struct pci_bus *bus) { }
>>>>>>   #if defined(CONFIG_OF_ADDRESS)
>>>>>>   int devm_of_pci_get_host_bridge_resources(struct device *dev,
>>>>>>                        unsigned char busno, unsigned char bus_max,
>>>>>> -                     struct list_head *resources, resource_size_t *io_base);
>>>>>> +                     struct list_head *resources,
>>>>>> +                     struct list_head *ib_resources,
>>>>>> +                     resource_size_t *io_base);
>>>>>>   #else
>>>>>>   static inline int devm_of_pci_get_host_bridge_resources(struct device *dev,
>>>>>>                        unsigned char busno, unsigned char bus_max,
>>>>>> -                     struct list_head *resources, resource_size_t *io_base)
>>>>>> +                     struct list_head *resources,
>>>>>> +                     struct list_head *ib_resources,
>>>>>> +                     resource_size_t *io_base)
>>>>>>   {
>>>>>>        return -EINVAL;
>>>>>>   }
>>>>>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>>>>>> index f9088c89a534..5cb94916eaa1 100644
>>>>>> --- a/include/linux/pci.h
>>>>>> +++ b/include/linux/pci.h
>>>>>> @@ -2278,6 +2278,7 @@ struct irq_domain;
>>>>>>   struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus);
>>>>>>   int pci_parse_request_of_pci_ranges(struct device *dev,
>>>>>>                                    struct list_head *resources,
>>>>>> +                                 struct list_head *ib_resources,
>>>>>>                                    struct resource **bus_range);
>>>>>>
>>>>>>   /* Arch may override this (weak) */
>>>>>> @@ -2286,9 +2287,11 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);
>>>>>>   #else        /* CONFIG_OF */
>>>>>>   static inline struct irq_domain *
>>>>>>   pci_host_bridge_of_msi_domain(struct pci_bus *bus) { return NULL; }
>>>>>> -static inline int pci_parse_request_of_pci_ranges(struct device *dev,
>>>>>> -                                               struct list_head *resources,
>>>>>> -                                               struct resource **bus_range)
>>>>>> +static inline int
>>>>>> +pci_parse_request_of_pci_ranges(struct device *dev,
>>>>>> +                             struct list_head *resources,
>>>>>> +                             struct list_head *ib_resources,
>>>>>> +                             struct resource **bus_range)
>>>>>>   {
>>>>>>        return -EINVAL;
>>>>>>   }
>>>>>> --
>>>>>> 2.20.1
>>>>>>

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