From b918c62e086b2130a7bae44110ca516ef10bfe5a Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Thu, 17 May 2012 18:51:11 -0700 Subject: PCI: replace struct pci_bus secondary/subordinate with busn_res Replace the struct pci_bus secondary/subordinate members with the struct resource busn_res. Later we'll build a resource tree of these bus numbers. [bhelgaas: changelog] Signed-off-by: Yinghai Lu Signed-off-by: Bjorn Helgaas --- drivers/pci/hotplug/acpiphp_glue.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/pci/hotplug/acpiphp_glue.c') diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 806c44fa645..62d0ae4dfca 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -100,11 +100,11 @@ static int post_dock_fixups(struct notifier_block *nb, unsigned long val, PCI_PRIMARY_BUS, &buses); - if (((buses >> 8) & 0xff) != bus->secondary) { + if (((buses >> 8) & 0xff) != bus->busn_res.start) { buses = (buses & 0xff000000) | ((unsigned int)(bus->primary) << 0) - | ((unsigned int)(bus->secondary) << 8) - | ((unsigned int)(bus->subordinate) << 16); + | ((unsigned int)(bus->busn_res.start) << 8) + | ((unsigned int)(bus->busn_res.end) << 16); pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); } return NOTIFY_OK; @@ -692,7 +692,7 @@ static unsigned char acpiphp_max_busnr(struct pci_bus *bus) * bus->subordinate value because it could have * padding in it. */ - max = bus->secondary; + max = bus->busn_res.start; list_for_each(tmp, &bus->children) { n = pci_bus_max_busnr(pci_bus_b(tmp)); -- cgit v1.2.3-70-g09d2 From 638f293307b5787b69bf0a0bc915aed491efbec9 Mon Sep 17 00:00:00 2001 From: Amos Kong Date: Tue, 22 May 2012 21:58:40 -0600 Subject: PCI: acpiphp: fix function 0 leak when disabling a slot Previously, we acquired two references to function 0, but only released one. [bhelgaas: split this out from "remove all functions" fix] Signed-off-by: Amos Kong Signed-off-by: Bjorn Helgaas --- drivers/pci/hotplug/acpiphp_glue.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/pci/hotplug/acpiphp_glue.c') diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 62d0ae4dfca..c8f99910276 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -893,6 +893,7 @@ static int disable_device(struct acpiphp_slot *slot) pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); if (!pdev) goto err_exit; + pci_dev_put(pdev); list_for_each_entry(func, &slot->funcs, sibling) { if (func->bridge) { -- cgit v1.2.3-70-g09d2 From ce29ca3ea40744f24c2b5d88431e8ac566d257cc Mon Sep 17 00:00:00 2001 From: Amos Kong Date: Wed, 23 May 2012 10:20:35 -0600 Subject: PCI: acpiphp: remove all functions in slot, even without ACPI _EJx When we add a device with acpiphp, we enumerate all functions in the slot with pci_scan_slot(), regardless of whether they have associated ACPI methods such as _EJ0. When removing the device, we previously removed only the functions with those ACPI methods. This patch makes the remove symmetric with the add: we remove all functions in the slot, whether they have associated ACPI methods or not. With qemu-kvm and SeaBIOS, we can build a multi-function device where only function 0 has _EJ0 and _ADR (see bugzilla below). Removing and re-adding that slot (including all functions of the device) works correctly with Windows guests. This patch makes it also work in Linux guests. [bhelgaas: restructure loop iteration, pull out of slot->funcs loop] Reference: https://bugzilla.kernel.org/show_bug.cgi?id=43219 Signed-off-by: Amos Kong Signed-off-by: Bjorn Helgaas --- drivers/pci/hotplug/acpiphp_glue.c | 42 +++++++++++++++++++++++++++++--------- drivers/pci/search.c | 2 ++ 2 files changed, 34 insertions(+), 10 deletions(-) (limited to 'drivers/pci/hotplug/acpiphp_glue.c') diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index c8f99910276..73af3374e91 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -878,6 +878,24 @@ static void disable_bridges(struct pci_bus *bus) } } +/* return first device in slot, acquiring a reference on it */ +static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) +{ + struct pci_bus *bus = slot->bridge->pci_bus; + struct pci_dev *dev; + struct pci_dev *ret = NULL; + + down_read(&pci_bus_sem); + list_for_each_entry(dev, &bus->devices, bus_list) + if (PCI_SLOT(dev->devfn) == slot->device) { + ret = pci_dev_get(dev); + break; + } + up_read(&pci_bus_sem); + + return ret; +} + /** * disable_device - disable a slot * @slot: ACPI PHP slot @@ -902,18 +920,22 @@ static int disable_device(struct acpiphp_slot *slot) (u32)1, NULL, NULL); func->bridge = NULL; } + } - pdev = pci_get_slot(slot->bridge->pci_bus, - PCI_DEVFN(slot->device, func->function)); - if (pdev) { - pci_stop_bus_device(pdev); - if (pdev->subordinate) { - disable_bridges(pdev->subordinate); - pci_disable_device(pdev); - } - __pci_remove_bus_device(pdev); - pci_dev_put(pdev); + /* + * enable_device() enumerates all functions in this device via + * pci_scan_slot(), whether they have associated ACPI hotplug + * methods (_EJ0, etc.) or not. Therefore, we remove all functions + * here. + */ + while ((pdev = dev_in_slot(slot))) { + pci_stop_bus_device(pdev); + if (pdev->subordinate) { + disable_bridges(pdev->subordinate); + pci_disable_device(pdev); } + __pci_remove_bus_device(pdev); + pci_dev_put(pdev); } list_for_each_entry(func, &slot->funcs, sibling) { diff --git a/drivers/pci/search.c b/drivers/pci/search.c index 9d75dc8ca60..993d4a0a246 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -15,6 +15,8 @@ #include "pci.h" DECLARE_RWSEM(pci_bus_sem); +EXPORT_SYMBOL_GPL(pci_bus_sem); + /* * find the upstream PCIe-to-PCI bridge of a PCI device * if the device is PCIE, return NULL -- cgit v1.2.3-70-g09d2 From dfb117b3e50c52c7b3416db4a4569224b8db80bb Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Wed, 20 Jun 2012 16:18:29 -0600 Subject: PCI: acpiphp: check whether _ADR evaluation succeeded Check whether we evaluated _ADR successfully. Previously we ignored failure, so we would have used garbage data from the stack as the device and function number. We return AE_OK so that we ignore only this slot and continue looking for other slots. Found by Coverity (CID 113981). Signed-off-by: Bjorn Helgaas --- drivers/pci/hotplug/acpiphp_glue.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'drivers/pci/hotplug/acpiphp_glue.c') diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 806c44fa645..09bf3772184 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -132,6 +132,15 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) return AE_OK; + status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); + if (ACPI_FAILURE(status)) { + warn("can't evaluate _ADR (%#x)\n", status); + return AE_OK; + } + + device = (adr >> 16) & 0xffff; + function = adr & 0xffff; + pdev = pbus->self; if (pdev && pci_is_pcie(pdev)) { tmp = acpi_find_root_bridge_handle(pdev); @@ -144,10 +153,6 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) } } - acpi_evaluate_integer(handle, "_ADR", NULL, &adr); - device = (adr >> 16) & 0xffff; - function = adr & 0xffff; - newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); if (!newfunc) return AE_NO_MEMORY; -- cgit v1.2.3-70-g09d2 From e735a80bd57d6b04e1c8f30da762ed0c6af5ee6a Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Sat, 23 Jun 2012 00:42:01 -0700 Subject: PCI: acpiphp: remove unused res_lock res_lock is never used, so remove it. Signed-off-by: Yinghai Lu Signed-off-by: Bjorn Helgaas --- drivers/pci/hotplug/acpiphp.h | 2 -- drivers/pci/hotplug/acpiphp_glue.c | 3 --- 2 files changed, 5 deletions(-) (limited to 'drivers/pci/hotplug/acpiphp_glue.c') diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h index 7722108e78d..6b58ed0432e 100644 --- a/drivers/pci/hotplug/acpiphp.h +++ b/drivers/pci/hotplug/acpiphp.h @@ -89,8 +89,6 @@ struct acpiphp_bridge { /* PCI-to-PCI bridge device */ struct pci_dev *pci_dev; - - spinlock_t res_lock; }; diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 806c44fa645..7dc8dd00135 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -391,8 +391,6 @@ static void add_host_bridge(acpi_handle *handle) bridge->pci_bus = root->bus; - spin_lock_init(&bridge->res_lock); - init_bridge_misc(bridge); } @@ -425,7 +423,6 @@ static void add_p2p_bridge(acpi_handle *handle) * (which we access during module unload). */ get_device(&bridge->pci_bus->dev); - spin_lock_init(&bridge->res_lock); init_bridge_misc(bridge); return; -- cgit v1.2.3-70-g09d2