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.
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. However, we overcome that
blocker by passing down parent device via pci_create_root_bus parameter
(as the ACPI device type). 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@xxxxxxx>
Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Tested-by: Duc Dang <dhdang@xxxxxxx>
Tested-by: Dongdong Liu <liudongdong3@xxxxxxxxxx>
Tested-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Tested-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
Tested-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
---
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 | 8 +++++++-
drivers/pci/probe.c | 2 ++
8 files changed, 12 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 07039d1..5050748 100644
--- a/arch/ia64/include/asm/pci.h
+++ b/arch/ia64/include/asm/pci.h
@@ -65,7 +65,6 @@ 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 0640739..bcfddc2 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 4625943..a98c022 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 081dc70..c67932e 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -334,7 +334,6 @@ 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));
@@ -349,7 +348,6 @@ 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);
}
@@ -367,21 +365,6 @@ 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..c2bd6dd 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -846,7 +846,13 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
pci_acpi_root_add_resources(info);
pci_add_resource(&info->resources, &root->secondary);
- bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
+
+ /*
+ * pci_create_root_bus() needs to detect the parent device type,
+ * so initialize its companion data accordingly.
+ */
+ ACPI_COMPANION_SET(&device->dev, device);
+ bus = pci_create_root_bus(&device->dev, busnum, ops->pci_ops,
sysdata, &info->resources);
if (!bus)
goto out_release_info;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6d7ab9b..88a4734 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2100,6 +2100,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
bridge->dev.parent = parent;
bridge->dev.release = pci_release_host_bridge_dev;
dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
+ if (parent)
+ ACPI_COMPANION_SET(&bridge->dev, ACPI_COMPANION(parent));
error = pcibios_root_bridge_prepare(bridge);
if (error) {
kfree(bridge);
--
1.9.1
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