Re: [PATCH v3 10/25] PCI: rockchip: Use pci_parse_request_of_pci_ranges()

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Hi Rob,

Missatge de Rob Herring <robh@xxxxxxxxxx> del dia dl., 28 d’oct. 2019
a les 17:38:
>
> Convert the Rockchip host bridge to use the common
> pci_parse_request_of_pci_ranges().
>
> There's no need to assign the resources to a temporary list first. Just
> use bridge->windows directly and remove all the temporary list handling.
>
> Cc: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Cc: Andrew Murray <andrew.murray@xxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Heiko Stuebner <heiko@xxxxxxxxx>
> Cc: linux-rockchip@xxxxxxxxxxxxxxxxxxx
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
> ---

I just tested mainline on my Samsung Chromebook Plus, and since
yesterday I'm getting a "synchronous external abort" [1]. After a
bisection, I found that this patch triggers the issue (this patch was
merged yesterday)

I didn't look in detail yet, but if you have any idea of what could be
the problem, that would be great.

Thanks,
 Enric

[1] https://hastebin.com/adasegihiw.rb

>  drivers/pci/controller/pcie-rockchip-host.c | 36 ++++-----------------
>  1 file changed, 7 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-rockchip-host.c b/drivers/pci/controller/pcie-rockchip-host.c
> index ef8e677ce9d1..8d2e6f2e141e 100644
> --- a/drivers/pci/controller/pcie-rockchip-host.c
> +++ b/drivers/pci/controller/pcie-rockchip-host.c
> @@ -950,14 +950,10 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>         struct device *dev = &pdev->dev;
>         struct pci_bus *bus, *child;
>         struct pci_host_bridge *bridge;
> +       struct resource *bus_res;
>         struct resource_entry *win;
> -       resource_size_t io_base;
> -       struct resource *mem;
> -       struct resource *io;
>         int err;
>
> -       LIST_HEAD(res);
> -
>         if (!dev->of_node)
>                 return -ENODEV;
>
> @@ -995,29 +991,20 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>         if (err < 0)
>                 goto err_deinit_port;
>
> -       err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
> -                                                   &res, &io_base);
> +       err = pci_parse_request_of_pci_ranges(dev, &bridge->windows, &bus_res);
>         if (err)
>                 goto err_remove_irq_domain;
>
> -       err = devm_request_pci_bus_resources(dev, &res);
> -       if (err)
> -               goto err_free_res;
> +       rockchip->root_bus_nr = bus_res->start;
>
>         /* Get the I/O and memory ranges from DT */
> -       resource_list_for_each_entry(win, &res) {
> +       resource_list_for_each_entry(win, &bridge->windows) {
>                 switch (resource_type(win->res)) {
>                 case IORESOURCE_IO:
>                         io = win->res;
>                         io->name = "I/O";
>                         rockchip->io_size = resource_size(io);
>                         rockchip->io_bus_addr = io->start - win->offset;
> -                       err = pci_remap_iospace(io, io_base);
> -                       if (err) {
> -                               dev_warn(dev, "error %d: failed to map resource %pR\n",
> -                                        err, io);
> -                               continue;
> -                       }
>                         rockchip->io = io;
>                         break;
>                 case IORESOURCE_MEM:
> @@ -1026,9 +1013,6 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>                         rockchip->mem_size = resource_size(mem);
>                         rockchip->mem_bus_addr = mem->start - win->offset;
>                         break;
> -               case IORESOURCE_BUS:
> -                       rockchip->root_bus_nr = win->res->start;
> -                       break;
>                 default:
>                         continue;
>                 }
> @@ -1036,15 +1020,14 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>
>         err = rockchip_pcie_cfg_atu(rockchip);
>         if (err)
> -               goto err_unmap_iospace;
> +               goto err_remove_irq_domain;
>
>         rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
>         if (!rockchip->msg_region) {
>                 err = -ENOMEM;
> -               goto err_unmap_iospace;
> +               goto err_remove_irq_domain;
>         }
>
> -       list_splice_init(&res, &bridge->windows);
>         bridge->dev.parent = dev;
>         bridge->sysdata = rockchip;
>         bridge->busnr = 0;
> @@ -1054,7 +1037,7 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>
>         err = pci_scan_root_bus_bridge(bridge);
>         if (err < 0)
> -               goto err_unmap_iospace;
> +               goto err_remove_irq_domain;
>
>         bus = bridge->bus;
>
> @@ -1068,10 +1051,6 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>         pci_bus_add_devices(bus);
>         return 0;
>
> -err_unmap_iospace:
> -       pci_unmap_iospace(rockchip->io);
> -err_free_res:
> -       pci_free_resource_list(&res);
>  err_remove_irq_domain:
>         irq_domain_remove(rockchip->irq_domain);
>  err_deinit_port:
> @@ -1097,7 +1076,6 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
>
>         pci_stop_root_bus(rockchip->root_bus);
>         pci_remove_root_bus(rockchip->root_bus);
> -       pci_unmap_iospace(rockchip->io);
>         irq_domain_remove(rockchip->irq_domain);
>
>         rockchip_pcie_deinit_phys(rockchip);
> --
> 2.20.1
>
>
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> Linux-mediatek@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-mediatek




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