Re: [Patch v2 18/22] PCI: Use common resource list management code instead of private implementation

Bjorn Helgaas
2015-01-29T01:32:40Z

On Wed, Jan 28, 2015 at 06:57:36PM +0800, Jiang Liu wrote:
> Use common resource list management data structure and interfaces
> instead of private implementation.
>
> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
> arch/arm/kernel/bios32.c | 5 ++---
> arch/x86/pci/bus_numa.c | 4 ++--
> drivers/pci/bus.c | 18 ++++++------------
> drivers/pci/host-bridge.c | 8 ++++----
> drivers/pci/host/pci-host-generic.c | 4 ++--
> drivers/pci/host/pci-xgene.c | 4 ++--
> drivers/pci/host/pcie-xilinx.c | 4 ++--
> drivers/pci/probe.c | 10 +++++-----
> include/linux/pci.h | 9 ++-------
> 9 files changed, 27 insertions(+), 39 deletions(-)
>
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index a4effd6d8f2f..968b03cb6376 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -422,17 +422,16 @@ static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
> static int pcibios_init_resources(int busnr, struct pci_sys_data *sys)
> {
> int ret;
> - struct pci_host_bridge_window *window;
> + struct resource_list_entry *window;
>
> if (list_empty(&sys->resources)) {
> pci_add_resource_offset(&sys->resources,
> &iomem_resource, sys->mem_offset);
> }
>
> - list_for_each_entry(window, &sys->resources, list) {
> + resource_list_for_each_entry(window, &sys->resources)
> if (resource_type(window->res) == IORESOURCE_IO)
> return 0;
> - }
>
> sys->io_res.start = (busnr * SZ_64K) ? : pcibios_min_io;
> sys->io_res.end = (busnr + 1) * SZ_64K - 1;
> diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c
> index f3a2cfc14125..6785af30ed39 100644
> --- a/arch/x86/pci/bus_numa.c
> +++ b/arch/x86/pci/bus_numa.c
> @@ -31,7 +31,7 @@ void x86_pci_root_bus_resources(int bus, struct list_head *resources)
> {
> struct pci_root_info *info = x86_find_pci_root_info(bus);
> struct pci_root_res *root_res;
> - struct pci_host_bridge_window *window;
> + struct resource_list_entry *window;
> bool found = false;
>
> if (!info)
> @@ -41,7 +41,7 @@ void x86_pci_root_bus_resources(int bus, struct list_head *resources)
> bus);
>
> /* already added by acpi ? */
> - list_for_each_entry(window, resources, list)
> + resource_list_for_each_entry(window, resources)
> if (window->res->flags & IORESOURCE_BUS) {
> found = true;
> break;
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index 8fb16188cd82..c850c48d81d2 100644
> --- a/drivers/pci/bus.c
> +++ b/drivers/pci/bus.c
> @@ -20,17 +20,16 @@
> void pci_add_resource_offset(struct list_head *resources, struct resource *res,
> resource_size_t offset)
> {
> - struct pci_host_bridge_window *window;
> + struct resource_list_entry *entry;
>
> - window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
> - if (!window) {
> + entry = resource_list_create_entry(res, 0);
> + if (!entry) {
> printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
> return;
> }
>
> - window->res = res;
> - window->offset = offset;
> - list_add_tail(&window->list, resources);
> + entry->offset = offset;
> + resource_list_add_tail(entry, resources);
> }
> EXPORT_SYMBOL(pci_add_resource_offset);
>
> @@ -42,12 +41,7 @@ EXPORT_SYMBOL(pci_add_resource);
>
> void pci_free_resource_list(struct list_head *resources)
> {
> - struct pci_host_bridge_window *window, *tmp;
> -
> - list_for_each_entry_safe(window, tmp, resources, list) {
> - list_del(&window->list);
> - kfree(window);
> - }
> + resource_list_free(resources);
> }
> EXPORT_SYMBOL(pci_free_resource_list);
>
> diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> index 0e5f3c95af5b..3ea13883e6a5 100644
> --- a/drivers/pci/host-bridge.c
> +++ b/drivers/pci/host-bridge.c
> @@ -35,10 +35,10 @@ void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
> struct resource *res)
> {
> struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
> - struct pci_host_bridge_window *window;
> + struct resource_list_entry *window;
> resource_size_t offset = 0;
>
> - list_for_each_entry(window, &bridge->windows, list) {
> + resource_list_for_each_entry(window, &bridge->windows) {
> if (resource_contains(window->res, res)) {
> offset = window->offset;
> break;
> @@ -60,10 +60,10 @@ void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
> struct pci_bus_region *region)
> {
> struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
> - struct pci_host_bridge_window *window;
> + struct resource_list_entry *window;
> resource_size_t offset = 0;
>
> - list_for_each_entry(window, &bridge->windows, list) {
> + resource_list_for_each_entry(window, &bridge->windows) {
> struct pci_bus_region bus_region;
>
> if (resource_type(res) != resource_type(window->res))
> diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
> index 6eb1aa75bd37..16d5d6eeb35a 100644
> --- a/drivers/pci/host/pci-host-generic.c
> +++ b/drivers/pci/host/pci-host-generic.c
> @@ -149,14 +149,14 @@ static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci)
> struct device *dev = pci->host.dev.parent;
> struct device_node *np = dev->of_node;
> resource_size_t iobase;
> - struct pci_host_bridge_window *win;
> + struct resource_list_entry *win;
>
> err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources,
> &iobase);
> if (err)
> return err;
>
> - list_for_each_entry(win, &pci->resources, list) {
> + resource_list_for_each_entry(win, &pci->resources) {
> struct resource *parent, *res = win->res;
>
> switch (resource_type(res)) {
> diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c
> index b1d0596457c5..e335b834f950 100644
> --- a/drivers/pci/host/pci-xgene.c
> +++ b/drivers/pci/host/pci-xgene.c
> @@ -401,11 +401,11 @@ static int xgene_pcie_map_ranges(struct xgene_pcie_port *port,
> struct list_head *res,
> resource_size_t io_base)
> {
> - struct pci_host_bridge_window *window;
> + struct resource_list_entry *window;
> struct device *dev = port->dev;
> int ret;
>
> - list_for_each_entry(window, res, list) {
> + resource_list_for_each_entry(window, res) {
> struct resource *res = window->res;
> u64 restype = resource_type(res);
>
> diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c
> index ef3ebaf9a738..253e993a111f 100644
> --- a/drivers/pci/host/pcie-xilinx.c
> +++ b/drivers/pci/host/pcie-xilinx.c
> @@ -737,7 +737,7 @@ static int xilinx_pcie_parse_and_add_res(struct xilinx_pcie_port *port)
> resource_size_t offset;
> struct of_pci_range_parser parser;
> struct of_pci_range range;
> - struct pci_host_bridge_window *win;
> + struct resource_list_entry *win;
> int err = 0, mem_resno = 0;
>
> /* Get the ranges */
> @@ -807,7 +807,7 @@ static int xilinx_pcie_parse_and_add_res(struct xilinx_pcie_port *port)
>
> free_resources:
> release_child_resources(&iomem_resource);
> - list_for_each_entry(win, &port->resources, list)
> + resource_list_for_each_entry(win, &port->resources)
> devm_kfree(dev, win->res);
> pci_free_resource_list(&port->resources);
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 23212f8ae09b..df6a40932aa0 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1895,7 +1895,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> int error;
> struct pci_host_bridge *bridge;
> struct pci_bus *b, *b2;
> - struct pci_host_bridge_window *window, *n;
> + struct resource_list_entry *window, *n;
> struct resource *res;
> resource_size_t offset;
> char bus_addr[64];
> @@ -1959,8 +1959,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
>
> /* Add initial resources to the bus */
> - list_for_each_entry_safe(window, n, resources, list) {
> - list_move_tail(&window->list, &bridge->windows);
> + resource_list_for_each_entry_safe(window, n, resources) {
> + list_move_tail(&window->node, &bridge->windows);
> res = window->res;
> offset = window->offset;
> if (res->flags & IORESOURCE_BUS)
> @@ -2060,12 +2060,12 @@ void pci_bus_release_busn_res(struct pci_bus *b)
> struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
> struct pci_ops *ops, void *sysdata, struct list_head *resources)
> {
> - struct pci_host_bridge_window *window;
> + struct resource_list_entry *window;
> bool found = false;
> struct pci_bus *b;
> int max;
>
> - list_for_each_entry(window, resources, list)
> + resource_list_for_each_entry(window, resources)
> if (window->res->flags & IORESOURCE_BUS) {
> found = true;
> break;
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 9603094ed59b..6aa40d62cdab 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -29,6 +29,7 @@
> #include <linux/atomic.h>
> #include <linux/device.h>
> #include <linux/io.h>
> +#include <linux/resource_ext.h>
> #include <uapi/linux/pci.h>
>
> #include <linux/pci_ids.h>
> @@ -397,16 +398,10 @@ static inline int pci_channel_offline(struct pci_dev *pdev)
> return (pdev->error_state != pci_channel_io_normal);
> }
>
> -struct pci_host_bridge_window {
> - struct list_head list;
> - struct resource *res; /* host bridge aperture (CPU address) */
> - resource_size_t offset; /* bus address + offset = CPU address */
> -};
> -
> struct pci_host_bridge {
> struct device dev;
> struct pci_bus *bus; /* root bus */
> - struct list_head windows; /* pci_host_bridge_windows */
> + struct list_head windows; /* resource_list_entry */
> void (*release_fn)(struct pci_host_bridge *);
> void *release_data;
> };
> --
> 1.7.10.4
>