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SubjectRe: [PATCH v9 08/21] ARM64 / ACPI: Introduce PCI stub functions for ACPI
On Wed, Feb 25, 2015 at 08:39:48AM +0000, Hanjun Guo wrote:
> CONFIG_ACPI depends CONFIG_PCI on x86 and ia64, in ARM64 server
> world we will have PCIe in most cases, but some of them may not,
> make CONFIG_ACPI depend CONFIG_PCI on ARM64 will satisfy both.
>
> With that case, we need some arch dependent PCI functions to
> access the config space before the PCI root bridge is created, and
> pci_acpi_scan_root() to create the PCI root bus. So introduce
> some stub function here to make ACPI core compile and revisit
> them later when implemented on ARM64.
>
> CC: Liviu Dudau <Liviu.Dudau@arm.com>
> CC: Catalin Marinas <catalin.marinas@arm.com>
> CC: Will Deacon <will.deacon@arm.com>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
> Tested-by: Yijing Wang <wangyijing@huawei.com>
> Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
> Tested-by: Jon Masters <jcm@redhat.com>
> Tested-by: Timur Tabi <timur@codeaurora.org>
> Tested-by: Robert Richter <rrichter@cavium.com>
> Acked-by: Robert Richter <rrichter@cavium.com>
> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
> ---
> arch/arm64/include/asm/pci.h | 6 ++++++
> arch/arm64/kernel/pci.c | 25 +++++++++++++++++++++++++
> 2 files changed, 31 insertions(+)
>
> diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
> index 872ba93..fded096 100644
> --- a/arch/arm64/include/asm/pci.h
> +++ b/arch/arm64/include/asm/pci.h
> @@ -24,6 +24,12 @@
> */
> #define PCI_DMA_BUS_IS_PHYS (0)

Hanjun,

>
> +static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
> +{
> + /* no legacy IRQ on arm64 */
> + return -ENODEV;
> +}
> +

Could you explain to me what situation you encountered where you needed
to define this? I'm trying to figure out when this would be needed and the
only thing I can come up with would be for drivers/pnp/resource.c, but that
is guarded by #ifdef CONFIG_PCI, which would mean that you should move this
a bit further down in the file, but also contradicts the last comment on
this patch (i.e. PCI on ACPI is not really implemented, so presumably
CONFIG_PCI is not enabled?)

Best regards,
Liviu


> extern int isa_dma_bridge_buggy;
> #ifdef CONFIG_PCI
> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> index 6f93c24..4095379 100644
> --- a/arch/arm64/kernel/pci.c
> +++ b/arch/arm64/kernel/pci.c
> @@ -10,6 +10,7 @@
> *
> */
>
> +#include <linux/acpi.h>
> #include <linux/init.h>
> #include <linux/io.h>
> #include <linux/kernel.h>
> @@ -46,3 +47,27 @@ int pcibios_add_device(struct pci_dev *dev)
>
> return 0;
> }
> +
> +/*
> + * raw_pci_read/write - Platform-specific PCI config space access.
> + */
> +int raw_pci_read(unsigned int domain, unsigned int bus,
> + unsigned int devfn, int reg, int len, u32 *val)
> +{
> + return -ENXIO;
> +}
> +
> +int raw_pci_write(unsigned int domain, unsigned int bus,
> + unsigned int devfn, int reg, int len, u32 val)
> +{
> + return -ENXIO;
> +}
> +
> +#ifdef CONFIG_ACPI
> +/* Root bridge scanning */
> +struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
> +{
> + /* TODO: Should be revisited when implementing PCI on ACPI */
> + return NULL;
> +}
> +#endif
> --
> 1.9.1
>
>

--
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| but they're not |
| giving me the |
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