Re: [PATCH 3/6] PCI: Introduce devm_of_pci_get_host_bridge_resources

From: Bjorn Helgaas
Date: Fri Apr 27 2018 - 18:24:36 EST

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On Tue, Apr 24, 2018 at 05:13:39PM +0200, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
>
> of_pci_get_host_bridge_resources allocates the resource structures it
> fills dynamically, but none of its callers care to release them so far.
> Rather than requiring everyone to do this explicitly, introduce a
> managed version of that service. This differs API-wise only in taking a
> reference to the associated device, rather than to the device tree node.
>
> As of_pci_get_host_bridge_resources is an exported interface, we cannot
> simply drop it at this point. After converting all in-tree users to the
> new API, we could phase out the unmanaged one over some grace period.

It looks like it might be possible to split this into three or four
patches:

1) Factor __of_pci_get_host_bridge_resources() out of
of_pci_get_host_bridge_resources()

2) Add struct device * argument

3) Convert pr_info() to dev_info()

4) Add devm_of_pci_get_host_bridge_resources()

> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> ---
> drivers/pci/of.c | 89 ++++++++++++++++++++++++++++++++------------------
> include/linux/of_pci.h | 14 ++++++--
> 2 files changed, 70 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index a28355c273ae..6eab0bde2ab3 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -243,26 +243,8 @@ void of_pci_check_probe_only(void)
> EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
>
> #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 buses 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 I/O ranges to be present in the device tree.
> - *
> - * It is the caller's 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,
> +static int __of_pci_get_host_bridge_resources(struct device *dev,
> + struct device_node *dev_node,
> unsigned char busno, unsigned char bus_max,
> struct list_head *resources, resource_size_t *io_base)
> {
> @@ -277,19 +259,22 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
> if (io_base)
> *io_base = (resource_size_t)OF_BAD_ADDR;
>
> - bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
> + if (dev)
> + bus_range = devm_kzalloc(dev,sizeof(*bus_range), GFP_KERNEL);
> + else
> + bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
> if (!bus_range)
> return -ENOMEM;
>
> - pr_info("host bridge %pOF ranges:\n", dev);
> + pr_info("host bridge %pOF ranges:\n", dev_node);

Since you now have a struct device *, maybe convert these to dev_info()?
It looks like __dev_printk() does something sensible if "dev" is NULL.

>
> - err = of_pci_parse_bus_range(dev, bus_range);
> + err = of_pci_parse_bus_range(dev_node, 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 %pOF, using %pR\n",
> - dev, bus_range);
> + dev_node, bus_range);
> } else {
> if (bus_range->end > bus_range->start + bus_max)
> bus_range->end = bus_range->start + bus_max;
> @@ -297,7 +282,7 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
> pci_add_resource(resources, bus_range);
>
> /* Check for ranges property */
> - err = of_pci_range_parser_init(&parser, dev);
> + err = of_pci_range_parser_init(&parser, dev_node);
> if (err)
> goto parse_failed;
>
> @@ -321,13 +306,17 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
> if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
> continue;
>
> - res = kzalloc(sizeof(struct resource), GFP_KERNEL);
> + if (dev)
> + res = devm_kzalloc(dev, sizeof(struct resource),
> + GFP_KERNEL);
> + else
> + res = kzalloc(sizeof(struct resource), GFP_KERNEL);
> if (!res) {
> err = -ENOMEM;
> goto parse_failed;
> }
>
> - err = of_pci_range_to_resource(&range, dev, res);
> + err = of_pci_range_to_resource(&range, dev_node, res);
> if (err) {
> kfree(res);
> continue;
> @@ -336,13 +325,13 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
> if (resource_type(res) == IORESOURCE_IO) {
> if (!io_base) {
> pr_err("I/O range found for %pOF. Please provide an io_base pointer to save CPU base address\n",
> - dev);
> + dev_node);
> err = -EINVAL;
> goto conversion_failed;
> }
> if (*io_base != (resource_size_t)OF_BAD_ADDR)
> pr_warn("More than one I/O resource converted for %pOF. CPU base address for old range lost!\n",
> - dev);
> + dev_node);
> *io_base = range.cpu_addr;
> }
>
> @@ -354,12 +343,50 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
> conversion_failed:
> kfree(res);
> parse_failed:
> - resource_list_for_each_entry(window, resources)
> - kfree(window->res);
> + if (!dev);
> + resource_list_for_each_entry(window, resources)
> + kfree(window->res);
> pci_free_resource_list(resources);
> return err;
> }
> +
> +/**
> + * 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 buses 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 I/O ranges to be present in the device tree.
> + *
> + * It is the caller's 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_node,
> + unsigned char busno, unsigned char bus_max,
> + struct list_head *resources, resource_size_t *io_base)
> +{
> + return __of_pci_get_host_bridge_resources(NULL, dev_node, busno,
> + bus_max, resources, io_base);
> +}
> EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
> +
> +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)
> +{
> + return __of_pci_get_host_bridge_resources(dev, dev->of_node, busno,
> + bus_max, resources, io_base);
> +}
> +EXPORT_SYMBOL_GPL(devm_of_pci_get_host_bridge_resources);
> +
> #endif /* CONFIG_OF_ADDRESS */
>
> /**
> diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
> index 091033a6b836..08b8f02426a5 100644
> --- a/include/linux/of_pci.h
> +++ b/include/linux/of_pci.h
> @@ -71,11 +71,21 @@ of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin)
> #endif
>
> #if defined(CONFIG_OF_ADDRESS)
> -int of_pci_get_host_bridge_resources(struct device_node *dev,
> +int of_pci_get_host_bridge_resources(struct device_node *dev_node,
> + unsigned char busno, unsigned char bus_max,
> + struct list_head *resources, resource_size_t *io_base);
> +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);
> #else
> -static inline int of_pci_get_host_bridge_resources(struct device_node *dev,
> +static inline int of_pci_get_host_bridge_resources(struct device_node *dev_node,
> + unsigned char busno, unsigned char bus_max,
> + struct list_head *resources, resource_size_t *io_base)
> +{
> + return -EINVAL;
> +}
> +
> +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)
> {
> --
> 2.13.6
>

Next message: Kyle Spiers: "[PATCH v2] rave-sp: Remove VLA"
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In reply to: Jan Kiszka: "Re: [PATCH 3/6] PCI: Introduce devm_of_pci_get_host_bridge_resources"
Next in thread: Jan Kiszka: "Re: [PATCH 3/6] PCI: Introduce devm_of_pci_get_host_bridge_resources"
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