PCI: acpiphp: Do not use ACPI PCI subdriver mechanism
Previously the acpiphp driver registered itself as an ACPI PCI subdriver,
so its callbacks were invoked when creating/destroying PCI root
buses to manage ACPI-based PCI hotplug slots. But it doesn't handle
P2P bridge hotplug events, so it will cause strange behaviour if there
are hotplug slots associated with a hot-removed P2P bridge.
This patch fixes this issue by:
1) Directly hooking into PCI core to update hotplug slot devices when
creating/destroying PCI buses through:
pci_{add|remove}_bus() -> acpi_pci_{add|remove}_bus()
2) Getting rid of unused ACPI PCI subdriver-related code
It also cleans up unused code in the acpiphp driver.
[bhelgaas: keep acpi_pci_add_bus() stub for CONFIG_ACPI=n]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Jiang Liu
Bjorn Helgaas
Родитель
6037a803b0
Коммит
3b63aaa70e
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@ -119,7 +119,6 @@ struct acpiphp_slot {
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*/
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struct acpiphp_func {
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struct acpiphp_slot *slot; /* parent */
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struct acpiphp_bridge *bridge; /* Ejectable PCI-to-PCI bridge */
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struct list_head sibling;
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struct notifier_block nb;
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@ -176,8 +175,6 @@ extern int acpiphp_register_hotplug_slot(struct acpiphp_slot *slot);
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extern void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *slot);
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/* acpiphp_glue.c */
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extern int acpiphp_glue_init (void);
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extern void acpiphp_glue_exit (void);
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typedef int (*acpiphp_callback)(struct acpiphp_slot *slot, void *data);
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extern int acpiphp_enable_slot (struct acpiphp_slot *slot);
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@ -37,6 +37,7 @@
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci-acpi.h>
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#include <linux/pci_hotplug.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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@ -354,19 +355,9 @@ void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
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}
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static int __init acpiphp_init(void)
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void __init acpiphp_init(void)
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{
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info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n",
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acpiphp_disabled ? ", disabled by user; please report a bug"
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: "");
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if (acpi_pci_disabled || acpiphp_disabled)
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return 0;
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/* read all the ACPI info from the system */
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/* initialize internal data structure etc. */
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return acpiphp_glue_init();
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}
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module_init(acpiphp_init);
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@ -157,6 +157,7 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
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int device, function, retval;
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struct pci_bus *pbus = bridge->pci_bus;
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struct pci_dev *pdev;
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u32 val;
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if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
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return AE_OK;
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@ -249,11 +250,9 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
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newfunc->slot = slot;
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list_add_tail(&newfunc->sibling, &slot->funcs);
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pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
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if (pdev) {
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if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
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&val, 60*1000))
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slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
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pci_dev_put(pdev);
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}
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if (is_dock_device(handle)) {
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/* we don't want to call this device's _EJ0
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@ -366,148 +365,6 @@ static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle
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}
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static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
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{
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acpi_handle dummy_handle;
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struct acpiphp_func *func;
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if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
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"_EJ0", &dummy_handle))) {
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bridge->flags |= BRIDGE_HAS_EJ0;
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dbg("found ejectable p2p bridge\n");
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/* make link between PCI bridge and PCI function */
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func = acpiphp_bridge_handle_to_function(bridge->handle);
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if (!func)
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return;
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bridge->func = func;
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func->bridge = bridge;
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}
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}
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/* allocate and initialize host bridge data structure */
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static void add_host_bridge(struct acpi_pci_root *root)
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{
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struct acpiphp_bridge *bridge;
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acpi_handle handle = root->device->handle;
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bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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if (bridge == NULL)
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return;
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bridge->handle = handle;
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bridge->pci_bus = root->bus;
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init_bridge_misc(bridge);
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}
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/* allocate and initialize PCI-to-PCI bridge data structure */
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static void add_p2p_bridge(acpi_handle *handle)
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{
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struct acpiphp_bridge *bridge;
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bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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if (bridge == NULL) {
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err("out of memory\n");
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return;
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}
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bridge->handle = handle;
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config_p2p_bridge_flags(bridge);
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bridge->pci_dev = acpi_get_pci_dev(handle);
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bridge->pci_bus = bridge->pci_dev->subordinate;
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if (!bridge->pci_bus) {
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err("This is not a PCI-to-PCI bridge!\n");
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goto err;
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}
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/*
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* Grab a ref to the subordinate PCI bus in case the bus is
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* removed via PCI core logical hotplug. The ref pins the bus
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* (which we access during module unload).
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*/
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get_device(&bridge->pci_bus->dev);
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init_bridge_misc(bridge);
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return;
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err:
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pci_dev_put(bridge->pci_dev);
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kfree(bridge);
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return;
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}
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/* callback routine to find P2P bridges */
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static acpi_status
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find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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acpi_status status;
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struct pci_dev *dev;
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dev = acpi_get_pci_dev(handle);
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if (!dev || !dev->subordinate)
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goto out;
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/* check if this bridge has ejectable slots */
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if ((detect_ejectable_slots(handle) > 0)) {
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dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
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add_p2p_bridge(handle);
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}
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/* search P2P bridges under this p2p bridge */
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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find_p2p_bridge, NULL, NULL, NULL);
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if (ACPI_FAILURE(status))
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warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
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out:
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pci_dev_put(dev);
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return AE_OK;
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}
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/* find hot-pluggable slots, and then find P2P bridge */
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static int add_bridge(struct acpi_pci_root *root)
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{
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acpi_status status;
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unsigned long long tmp;
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acpi_handle dummy_handle;
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acpi_handle handle = root->device->handle;
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/* if the bridge doesn't have _STA, we assume it is always there */
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status = acpi_get_handle(handle, "_STA", &dummy_handle);
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if (ACPI_SUCCESS(status)) {
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status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
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if (ACPI_FAILURE(status)) {
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dbg("%s: _STA evaluation failure\n", __func__);
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return 0;
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}
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if ((tmp & ACPI_STA_DEVICE_FUNCTIONING) == 0)
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/* don't register this object */
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return 0;
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}
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/* check if this bridge has ejectable slots */
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if (detect_ejectable_slots(handle) > 0) {
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dbg("found PCI host-bus bridge with hot-pluggable slots\n");
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add_host_bridge(root);
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}
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/* search P2P bridges under this host bridge */
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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find_p2p_bridge, NULL, NULL, NULL);
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if (ACPI_FAILURE(status))
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warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
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return 0;
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}
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static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
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{
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struct acpiphp_bridge *bridge;
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@ -567,56 +424,12 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
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slot = next;
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}
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/*
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* Only P2P bridges have a pci_dev
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*/
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if (bridge->pci_dev)
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put_device(&bridge->pci_bus->dev);
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put_device(&bridge->pci_bus->dev);
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pci_dev_put(bridge->pci_dev);
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list_del(&bridge->list);
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kfree(bridge);
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}
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static acpi_status
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cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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struct acpiphp_bridge *bridge;
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/* cleanup p2p bridges under this P2P bridge
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in a depth-first manner */
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acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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cleanup_p2p_bridge, NULL, NULL, NULL);
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bridge = acpiphp_handle_to_bridge(handle);
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if (bridge)
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cleanup_bridge(bridge);
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return AE_OK;
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}
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static void remove_bridge(struct acpi_pci_root *root)
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{
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struct acpiphp_bridge *bridge;
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acpi_handle handle = root->device->handle;
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/* cleanup p2p bridges under this host bridge
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in a depth-first manner */
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acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
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(u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
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/*
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* On root bridges with hotplug slots directly underneath (ie,
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* no p2p bridge between), we call cleanup_bridge().
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*
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* The else clause cleans up root bridges that either had no
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* hotplug slots at all, or had a p2p bridge underneath.
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*/
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bridge = acpiphp_handle_to_bridge(handle);
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if (bridge)
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cleanup_bridge(bridge);
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}
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static int power_on_slot(struct acpiphp_slot *slot)
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{
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acpi_status status;
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@ -798,6 +611,7 @@ static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
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}
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}
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}
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/**
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* enable_device - enable, configure a slot
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* @slot: slot to be enabled
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@ -812,7 +626,6 @@ static int __ref enable_device(struct acpiphp_slot *slot)
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struct acpiphp_func *func;
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int retval = 0;
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int num, max, pass;
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acpi_status status;
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if (slot->flags & SLOT_ENABLED)
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goto err_exit;
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@ -867,18 +680,6 @@ static int __ref enable_device(struct acpiphp_slot *slot)
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slot->flags &= (~SLOT_ENABLED);
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continue;
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}
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if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
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dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
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pci_dev_put(dev);
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continue;
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}
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status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
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if (ACPI_FAILURE(status))
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warn("find_p2p_bridge failed (error code = 0x%x)\n",
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status);
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pci_dev_put(dev);
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}
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@ -912,16 +713,6 @@ static int disable_device(struct acpiphp_slot *slot)
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{
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struct acpiphp_func *func;
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struct pci_dev *pdev;
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struct pci_bus *bus = slot->bridge->pci_bus;
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list_for_each_entry(func, &slot->funcs, sibling) {
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if (func->bridge) {
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/* cleanup p2p bridges under this P2P bridge */
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cleanup_p2p_bridge(func->bridge->handle,
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(u32)1, NULL, NULL);
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func->bridge = NULL;
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}
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}
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/*
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* enable_device() enumerates all functions in this device via
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@ -940,7 +731,6 @@ static int disable_device(struct acpiphp_slot *slot)
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slot->flags &= (~SLOT_ENABLED);
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err_exit:
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return 0;
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}
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@ -1287,30 +1077,62 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type,
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alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func);
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}
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static struct acpi_pci_driver acpi_pci_hp_driver = {
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.add = add_bridge,
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.remove = remove_bridge,
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};
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/**
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* acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
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/*
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* Create hotplug slots for the PCI bus.
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* It should always return 0 to avoid skipping following notifiers.
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*/
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int __init acpiphp_glue_init(void)
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void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle)
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{
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acpi_pci_register_driver(&acpi_pci_hp_driver);
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acpi_handle dummy_handle;
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struct acpiphp_bridge *bridge;
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return 0;
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if (acpiphp_disabled)
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return;
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if (detect_ejectable_slots(handle) <= 0)
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return;
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bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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if (bridge == NULL) {
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err("out of memory\n");
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return;
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}
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bridge->handle = handle;
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bridge->pci_dev = pci_dev_get(bus->self);
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bridge->pci_bus = bus;
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/*
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* Grab a ref to the subordinate PCI bus in case the bus is
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* removed via PCI core logical hotplug. The ref pins the bus
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* (which we access during module unload).
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*/
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get_device(&bus->dev);
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if (!pci_is_root_bus(bridge->pci_bus) &&
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ACPI_SUCCESS(acpi_get_handle(bridge->handle,
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"_EJ0", &dummy_handle))) {
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dbg("found ejectable p2p bridge\n");
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bridge->flags |= BRIDGE_HAS_EJ0;
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bridge->func = acpiphp_bridge_handle_to_function(handle);
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}
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init_bridge_misc(bridge);
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}
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/**
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* acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
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*
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* This function frees all data allocated in acpiphp_glue_init().
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*/
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void acpiphp_glue_exit(void)
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/* Destroy hotplug slots associated with the PCI bus */
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void acpiphp_remove_slots(struct pci_bus *bus)
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{
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acpi_pci_unregister_driver(&acpi_pci_hp_driver);
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struct acpiphp_bridge *bridge, *tmp;
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if (acpiphp_disabled)
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return;
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list_for_each_entry_safe(bridge, tmp, &bridge_list, list)
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if (bridge->pci_bus == bus) {
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cleanup_bridge(bridge);
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break;
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}
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}
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/**
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|
|
|
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|
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@ -297,6 +297,7 @@ void acpi_pci_add_bus(struct pci_bus *bus)
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return;
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acpi_pci_slot_enumerate(bus, handle);
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acpiphp_enumerate_slots(bus, handle);
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}
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void acpi_pci_remove_bus(struct pci_bus *bus)
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@ -308,6 +309,7 @@ void acpi_pci_remove_bus(struct pci_bus *bus)
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if (acpi_pci_disabled)
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return;
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acpiphp_remove_slots(bus);
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acpi_pci_slot_remove(bus);
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}
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|
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|
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@ -388,6 +390,7 @@ static int __init acpi_pci_init(void)
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pci_set_platform_pm(&acpi_pci_platform_pm);
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acpi_pci_slot_init();
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acpiphp_init();
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return 0;
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}
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|
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|
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|
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@ -56,6 +56,17 @@ static inline void acpi_pci_slot_enumerate(struct pci_bus *bus,
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static inline void acpi_pci_slot_remove(struct pci_bus *bus) { }
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#endif
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|
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#ifdef CONFIG_HOTPLUG_PCI_ACPI
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void acpiphp_init(void);
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void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle);
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void acpiphp_remove_slots(struct pci_bus *bus);
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#else
|
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static inline void acpiphp_init(void) { }
|
||||
static inline void acpiphp_enumerate_slots(struct pci_bus *bus,
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acpi_handle handle) { }
|
||||
static inline void acpiphp_remove_slots(struct pci_bus *bus) { }
|
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#endif
|
||||
|
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#else /* CONFIG_ACPI */
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static inline void acpi_pci_add_bus(struct pci_bus *bus) { }
|
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static inline void acpi_pci_remove_bus(struct pci_bus *bus) { }
|
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|
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