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Message-ID: <292578579.uIxhMjkdfG@vostro.rjw.lan>
Date: Tue, 10 May 2016 00:56:37 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Tomasz Nowicki <tn@...ihalf.com>
Cc: helgaas@...nel.org, arnd@...db.de, will.deacon@....com,
catalin.marinas@....com, rafael@...nel.org, hanjun.guo@...aro.org,
Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
jiang.liu@...ux.intel.com, jchandra@...adcom.com,
robert.richter@...iumnetworks.com, mw@...ihalf.com,
Liviu.Dudau@....com, ddaney@...iumnetworks.com,
wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
msalter@...hat.com, linux-pci@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
jcm@...hat.com
Subject: Re: [PATCH V6 01/13] pci, acpi, x86, ia64: Move ACPI host bridge device companion assignment to core code.
On Friday, April 15, 2016 07:06:36 PM Tomasz Nowicki wrote:
> Currently we have two platforms (x86 & ia64) capable of PCI ACPI host
> bridge initialization. They both use arch-specific sysdata to pass down
> parent device reference and both rely on NULL parent in pci_create_root_bus()
> to validate sysdata content.
No, this is not relied on for that. It is just NULL, because we don't
have a physical parent device representation for the PCI host bridge.
> It looks hacky and prevents us from getting some firmware specific
> info for PCI host controller based on its acpi_device structure
> in generic pci_create_root_bus() function.
You can't get that info without adding ACPI-specific code to that function
anyway.
> However, we overcome that blocker by passing down parent device via
> pci_create_root_bus parameter (as the ACPI device type).
Which is completely wrong.
> Then we use ACPI_COMPANION_SET in core code
> for ACPI boot method only. ACPI_COMPANION_SET is safe to run for all
> cases DT, ACPI and DT&ACPI.
>
> Since now PCI core code is setting ACPI companion device for us,
> x86 & ia64 specific ACPI companion device setting turns out to be dead now.
> We can get rid of it, including related companion reference from
> PCI sysdata structure. Aslo, PCI_CONTROLLER macro cannot return valid
> companion device anymore. Therefore we need to convert its usage to
> ACPI_COMPANION.
>
> Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Tested-by: Duc Dang <dhdang@....com>
> Tested-by: Dongdong Liu <liudongdong3@...wei.com>
> Tested-by: Hanjun Guo <hanjun.guo@...aro.org>
> Tested-by: Graeme Gregory <graeme.gregory@...aro.org>
> Tested-by: Sinan Kaya <okaya@...eaurora.org>
> ---
> arch/ia64/hp/common/sba_iommu.c | 2 +-
> arch/ia64/include/asm/pci.h | 1 -
> arch/ia64/pci/pci.c | 16 ----------------
> arch/ia64/sn/kernel/io_acpi_init.c | 4 ++--
> arch/x86/include/asm/pci.h | 3 ---
> arch/x86/pci/acpi.c | 17 -----------------
> drivers/acpi/pci_root.c | 7 ++++++-
> drivers/pci/probe.c | 2 ++
> 8 files changed, 11 insertions(+), 41 deletions(-)
>
> diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
> index a6d6190..78e4444 100644
> --- a/arch/ia64/hp/common/sba_iommu.c
> +++ b/arch/ia64/hp/common/sba_iommu.c
> @@ -1981,7 +1981,7 @@ sba_connect_bus(struct pci_bus *bus)
> if (PCI_CONTROLLER(bus)->iommu)
> return;
>
> - handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion);
> + handle = acpi_device_handle(ACPI_COMPANION(bus->bridge));
> if (!handle)
> return;
>
> diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
> index c0835b0..12423f4 100644
> --- a/arch/ia64/include/asm/pci.h
> +++ b/arch/ia64/include/asm/pci.h
> @@ -63,7 +63,6 @@ extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
> #define pci_legacy_write platform_pci_legacy_write
>
> struct pci_controller {
> - struct acpi_device *companion;
> void *iommu;
> int segment;
> int node; /* nearest node with memory or NUMA_NO_NODE for global allocation */
> diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
> index 8f6ac2f..978d6af 100644
> --- a/arch/ia64/pci/pci.c
> +++ b/arch/ia64/pci/pci.c
> @@ -301,28 +301,12 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
> }
>
> info->controller.segment = root->segment;
> - info->controller.companion = device;
> info->controller.node = acpi_get_node(device->handle);
> INIT_LIST_HEAD(&info->io_resources);
> return acpi_pci_root_create(root, &pci_acpi_root_ops,
> &info->common, &info->controller);
> }
>
> -int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
> -{
> - /*
> - * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
> - * here, pci_create_root_bus() has been called by someone else and
> - * sysdata is likely to be different from what we expect. Let it go in
> - * that case.
> - */
> - if (!bridge->dev.parent) {
> - struct pci_controller *controller = bridge->bus->sysdata;
> - ACPI_COMPANION_SET(&bridge->dev, controller->companion);
> - }
> - return 0;
> -}
> -
> void pcibios_fixup_device_resources(struct pci_dev *dev)
> {
> int idx;
> diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
> index 231234c..e454492 100644
> --- a/arch/ia64/sn/kernel/io_acpi_init.c
> +++ b/arch/ia64/sn/kernel/io_acpi_init.c
> @@ -132,7 +132,7 @@ sn_get_bussoft_ptr(struct pci_bus *bus)
> struct acpi_resource_vendor_typed *vendor;
>
>
> - handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion);
> + handle = acpi_device_handle(ACPI_COMPANION(bus->bridge));
> status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
> &sn_uuid, &buffer);
> if (ACPI_FAILURE(status)) {
> @@ -360,7 +360,7 @@ sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
> acpi_status status;
> struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
>
> - rootbus_handle = acpi_device_handle(PCI_CONTROLLER(dev)->companion);
> + rootbus_handle = acpi_device_handle(ACPI_COMPANION(dev->bus->bridge));
> status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
> &segment);
> if (ACPI_SUCCESS(status)) {
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 9ab7507..24de07d 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -14,9 +14,6 @@
> struct pci_sysdata {
> int domain; /* PCI domain */
> int node; /* NUMA node */
> -#ifdef CONFIG_ACPI
> - struct acpi_device *companion; /* ACPI companion device */
> -#endif
> #ifdef CONFIG_X86_64
> void *iommu; /* IOMMU private data */
> #endif
> diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
> index 3cd6983..f4ca17a 100644
> --- a/arch/x86/pci/acpi.c
> +++ b/arch/x86/pci/acpi.c
> @@ -340,7 +340,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
> struct pci_sysdata sd = {
> .domain = domain,
> .node = node,
> - .companion = root->device
> };
>
> memcpy(bus->sysdata, &sd, sizeof(sd));
> @@ -355,7 +354,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
> else {
> info->sd.domain = domain;
> info->sd.node = node;
> - info->sd.companion = root->device;
> bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
> &info->common, &info->sd);
> }
> @@ -373,21 +371,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
> return bus;
> }
>
> -int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
> -{
> - /*
> - * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
> - * here, pci_create_root_bus() has been called by someone else and
> - * sysdata is likely to be different from what we expect. Let it go in
> - * that case.
> - */
> - if (!bridge->dev.parent) {
> - struct pci_sysdata *sd = bridge->bus->sysdata;
> - ACPI_COMPANION_SET(&bridge->dev, sd->companion);
> - }
> - return 0;
> -}
> -
> int __init pci_acpi_init(void)
> {
> struct pci_dev *dev = NULL;
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index ae3fe4e..4581e0e 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -564,6 +564,11 @@ static int acpi_pci_root_add(struct acpi_device *device,
> }
> }
>
> + /*
> + * pci_create_root_bus() needs to detect the parent device type,
> + * so initialize its companion data accordingly.
> + */
> + ACPI_COMPANION_SET(&device->dev, device);
This is a complete nonsense, sorry.
This just means that the ACPI firmware object will now be an ACPI companion of
itself.
Thanks,
Rafael
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