On Thursday, October 30, 2014 8:45 PM, Lorenzo Pieralisi wrote:
>
> Most if not all ARM PCI host controller device drivers either ignore the
> domain field in the pci_sys_data structure or just increment it every
> time a host controller is probed, using it as a domain counter.
>
> Therefore, instead of relying on pci_sys_data to stash the domain number
> in a standard location, ARM pcibios code can be moved to the newly
> introduced generic PCI domains code, implemented in commits:
>
> commit 41e5c0f81d3e676d671d96a0a1fafb27abfbd9
> ("of/pci: Add pci_get_new_domain_nr() and of_get_pci_domain_nr()")
>
> commit 670ba0c8883b576d0aec28bd7a838358a4be1
> ("PCI: Add generic domain handling")
>
> In order to assign a domain number dynamically, the ARM pcibios defines
> the function, called by core PCI code:
>
> void pci_bus_assign_domain_nr(...)
>
> that relies on a DT property to define the domain number or falls back to
> a counter; its usage replaces the current domain assignment code in PCI
> host controllers present in the kernel.
>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> Cc: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
> Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
> Cc: Mohit Kumar <mohit.kumar@xxxxxx>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
(+CC Richard Zhu, Lucas Stach, Kishon Vijay Abraham I, Murali Karicheri)
Acked-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
For a long time, I have wanted the patch like this. Personally,
I want to increase the build coverage and keep the same binary
regardless of config options as possible; thus, I don't like
#ifdef guards such as '#ifdef CONFIG_PCI_DOMAINS'. When I submitted
the first patch for 'pcie-designware.c', I was not able to find
a way to remove '#ifdef CONFIG_PCI_DOMAINS' from 'pcie-designware.c'.
This patch looks good and I think that this patch will not make
the problem. However, I didn't test this patch with Exynos platform,
due to some reasons. So, I hope that other engineers test this patch
on other SoC platforms related to designware PCIe.
To Mohit Kumar (ST SPEAR13XX), Richard Zhu/Lucas Stach (IMX6)
Kishon Vijay Abraham I (TI DRA7XX), Murali Karicheri (TI KEYSTONE)
Would you test this patch and share the result?
It would be very helpful. Thank you.
Best regards,
Jingoo Han
> ---
> arch/arm/Kconfig | 3 +++
> arch/arm/include/asm/mach/pci.h | 3 ---
> arch/arm/include/asm/pci.h | 7 -------
> arch/arm/kernel/bios32.c | 26 +++++++++++++++++++++++---
> drivers/pci/host/pci-mvebu.c | 10 ++--------
> drivers/pci/host/pcie-designware.c | 3 ---
> drivers/pci/host/pcie-rcar.c | 3 ---
> 7 files changed, 28 insertions(+), 27 deletions(-)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 89c4b5c..29544f0 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1292,6 +1292,9 @@ config PCI_DOMAINS
> bool
> depends on PCI
>
> +config PCI_DOMAINS_GENERIC
> + def_bool PCI_DOMAINS
> +
> config PCI_NANOENGINE
> bool "BSE nanoEngine PCI support"
> depends on SA1100_NANOENGINE
> diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h
> index 7fc4278..f19f627 100644
> --- a/arch/arm/include/asm/mach/pci.h
> +++ b/arch/arm/include/asm/mach/pci.h
> @@ -44,9 +44,6 @@ struct hw_pci {
> * Per-controller structure
> */
> struct pci_sys_data {
> -#ifdef CONFIG_PCI_DOMAINS
> - int domain;
> -#endif
> struct list_head node;
> int busnr; /* primary bus number */
> u64 mem_offset; /* bus->cpu memory mapping offset */
> diff --git a/arch/arm/include/asm/pci.h b/arch/arm/include/asm/pci.h
> index 7e95d85..585dc33 100644
> --- a/arch/arm/include/asm/pci.h
> +++ b/arch/arm/include/asm/pci.h
> @@ -18,13 +18,6 @@ static inline int pcibios_assign_all_busses(void)
> }
>
> #ifdef CONFIG_PCI_DOMAINS
> -static inline int pci_domain_nr(struct pci_bus *bus)
> -{
> - struct pci_sys_data *root = bus->sysdata;
> -
> - return root->domain;
> -}
> -
> static inline int pci_proc_domain(struct pci_bus *bus)
> {
> return pci_domain_nr(bus);
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index 17a26c1..d8c2b4e 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -11,6 +11,8 @@
> #include <linux/slab.h>
> #include <linux/init.h>
> #include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_pci.h>
>
> #include <asm/mach-types.h>
> #include <asm/mach/map.h>
> @@ -468,9 +470,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
> if (!sys)
> panic("PCI: unable to allocate sys data!");
>
> -#ifdef CONFIG_PCI_DOMAINS
> - sys->domain = hw->domain;
> -#endif
> sys->busnr = busnr;
> sys->swizzle = hw->swizzle;
> sys->map_irq = hw->map_irq;
> @@ -511,6 +510,27 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
> }
> }
>
> +#ifdef CONFIG_PCI_DOMAINS_GENERIC
> +static bool dt_domain_found;
> +
> +void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
> +{
> + int domain = of_get_pci_domain_nr(parent->of_node);
> +
> + if (domain >= 0) {
> + dt_domain_found = true;
> + } else if (dt_domain_found == true) {
> + dev_err(parent, "Node %s is missing \"linux,pci-domain\" property in DT\n",
> + parent->of_node->full_name);
> + return;
> + } else {
> + domain = pci_get_new_domain_nr();
> + }
> +
> + bus->domain_nr = domain;
> +}
> +#endif
> +
> void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
> {
> struct pci_sys_data *sys;
> diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
> index b1315e1..2b4c1f2 100644
> --- a/drivers/pci/host/pci-mvebu.c
> +++ b/drivers/pci/host/pci-mvebu.c
> @@ -722,17 +722,11 @@ static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
> {
> struct mvebu_pcie *pcie = sys_to_pcie(sys);
> int i;
> - int domain = 0;
>
> -#ifdef CONFIG_PCI_DOMAINS
> - domain = sys->domain;
> -#endif
> -
> - snprintf(pcie->mem_name, sizeof(pcie->mem_name), "PCI MEM %04x",
> - domain);
> + snprintf(pcie->mem_name, sizeof(pcie->mem_name), "PCI MEM %04x", nr);
> pcie->mem.name = pcie->mem_name;
>
> - snprintf(pcie->io_name, sizeof(pcie->io_name), "PCI I/O %04x", domain);
> + snprintf(pcie->io_name, sizeof(pcie->io_name), "PCI I/O %04x", nr);
> pcie->realio.name = pcie->io_name;
>
> if (request_resource(&iomem_resource, &pcie->mem))
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index dfed00a..6790b87 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -502,9 +502,6 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> dw_pci.private_data = (void **)&pp;
>
> pci_common_init_dev(pp->dev, &dw_pci);
> -#ifdef CONFIG_PCI_DOMAINS
> - dw_pci.domain++;
> -#endif
>
> return 0;
> }
> diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
> index 61158e0..b6b859e 100644
> --- a/drivers/pci/host/pcie-rcar.c
> +++ b/drivers/pci/host/pcie-rcar.c
> @@ -404,9 +404,6 @@ static void rcar_pcie_enable(struct rcar_pcie *pcie)
> rcar_pci.private_data = (void **)&pcie;
>
> pci_common_init_dev(&pdev->dev, &rcar_pci);
> -#ifdef CONFIG_PCI_DOMAINS
> - rcar_pci.domain++;
> -#endif
> }
>
> static int phy_wait_for_ack(struct rcar_pcie *pcie)
> --
> 2.1.2
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