Merge tag 'pci-v3.13-fixes-2' of git://git.kernel.org/pub/scm/linux/k…

…ernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:
 "PCI device hotplug
    - Move device_del() from pci_stop_dev() to pci_destroy_dev() (Rafael
      Wysocki)

  Host bridge drivers
    - Update maintainers for DesignWare, i.MX6, Armada, R-Car (Bjorn
      Helgaas)
    - mvebu: Return 'unsupported' for Interrupt Line and Interrupt Pin
      (Jason Gunthorpe)

  Miscellaneous
    - Avoid unnecessary CPU switch when calling .probe() (Alexander
      Duyck)
    - Revert "workqueue: allow work_on_cpu() to be called recursively"
      (Bjorn Helgaas)
    - Disable Bus Master only on kexec reboot (Khalid Aziz)
    - Omit PCI ID macro strings to shorten quirk names for LTO (Michal
      Marek)"

* tag 'pci-v3.13-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  MAINTAINERS: Add DesignWare, i.MX6, Armada, R-Car PCI host maintainers
  PCI: Disable Bus Master only on kexec reboot
  PCI: mvebu: Return 'unsupported' for Interrupt Line and Interrupt Pin
  PCI: Omit PCI ID macro strings to shorten quirk names
  PCI: Move device_del() from pci_stop_dev() to pci_destroy_dev()
  Revert "workqueue: allow work_on_cpu() to be called recursively"
  PCI: Avoid unnecessary CPU switch when calling driver .probe() method

MAINTAINERS

@@ -6465,19 +6465,52 @@ F:	drivers/pci/
 F:	include/linux/pci*
 F:	arch/x86/pci/
 
+PCI DRIVER FOR IMX6
+M:	Richard Zhu <r65037@freescale.com>
+M:	Shawn Guo <shawn.guo@linaro.org>
+L:	linux-pci@vger.kernel.org
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:	Maintained
+F:	drivers/pci/host/*imx6*
+
+PCI DRIVER FOR MVEBU (Marvell Armada 370 and Armada XP SOC support)
+M:	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+M:	Jason Cooper <jason@lakedaemon.net>
+L:	linux-pci@vger.kernel.org
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:	Maintained
+F:	drivers/pci/host/*mvebu*
+
 PCI DRIVER FOR NVIDIA TEGRA
 M:	Thierry Reding <thierry.reding@gmail.com>
 L:	linux-tegra@vger.kernel.org
+L:	linux-pci@vger.kernel.org
 S:	Supported
 F:	Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
 F:	drivers/pci/host/pci-tegra.c
 
+PCI DRIVER FOR RENESAS R-CAR
+M:	Simon Horman <horms@verge.net.au>
+L:	linux-pci@vger.kernel.org
+L:	linux-sh@vger.kernel.org
+S:	Maintained
+F:	drivers/pci/host/*rcar*
+
 PCI DRIVER FOR SAMSUNG EXYNOS
 M:	Jingoo Han <jg1.han@samsung.com>
 L:	linux-pci@vger.kernel.org
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+L:	linux-samsung-soc@vger.kernel.org (moderated for non-subscribers)
 S:	Maintained
 F:	drivers/pci/host/pci-exynos.c
 
+PCI DRIVER FOR SYNOPSIS DESIGNWARE
+M:	Mohit Kumar <mohit.kumar@st.com>
+M:	Jingoo Han <jg1.han@samsung.com>
+L:	linux-pci@vger.kernel.org
+S:	Maintained
+F:	drivers/pci/host/*designware*
+
 PCMCIA SUBSYSTEM
 P:	Linux PCMCIA Team
 L:	linux-pcmcia@lists.infradead.org

drivers/pci/host/pci-mvebu.c

@@ -447,6 +447,11 @@ static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
 		*value = 0;
 		break;
 
+	case PCI_INTERRUPT_LINE:
+		/* LINE PIN MIN_GNT MAX_LAT */
+		*value = 0;
+		break;
+
 	default:
 		*value = 0xffffffff;
 		return PCIBIOS_BAD_REGISTER_NUMBER;

drivers/pci/pci-driver.c

@@ -19,6 +19,7 @@
 #include <linux/cpu.h>
 #include <linux/pm_runtime.h>
 #include <linux/suspend.h>
+#include <linux/kexec.h>
 #include "pci.h"
 
 struct pci_dynid {
@@ -288,12 +289,27 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 	int error, node;
 	struct drv_dev_and_id ddi = { drv, dev, id };
 
-	/* Execute driver initialization on node where the device's
-	   bus is attached to.  This way the driver likely allocates
-	   its local memory on the right node without any need to
-	   change it. */
+	/*
+	 * Execute driver initialization on node where the device is
+	 * attached.  This way the driver likely allocates its local memory
+	 * on the right node.
+	 */
 	node = dev_to_node(&dev->dev);
-	if (node >= 0) {
+
+	/*
+	 * On NUMA systems, we are likely to call a PF probe function using
+	 * work_on_cpu().  If that probe calls pci_enable_sriov() (which
+	 * adds the VF devices via pci_bus_add_device()), we may re-enter
+	 * this function to call the VF probe function.  Calling
+	 * work_on_cpu() again will cause a lockdep warning.  Since VFs are
+	 * always on the same node as the PF, we can work around this by
+	 * avoiding work_on_cpu() when we're already on the correct node.
+	 *
+	 * Preemption is enabled, so it's theoretically unsafe to use
+	 * numa_node_id(), but even if we run the probe function on the
+	 * wrong node, it should be functionally correct.
+	 */
+	if (node >= 0 && node != numa_node_id()) {
 		int cpu;
 
 		get_online_cpus();
@@ -305,6 +321,7 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 		put_online_cpus();
 	} else
 		error = local_pci_probe(&ddi);
+
 	return error;
 }
 
@@ -399,12 +416,17 @@ static void pci_device_shutdown(struct device *dev)
 	pci_msi_shutdown(pci_dev);
 	pci_msix_shutdown(pci_dev);
 
+#ifdef CONFIG_KEXEC
 	/*
-	 * Turn off Bus Master bit on the device to tell it to not
-	 * continue to do DMA. Don't touch devices in D3cold or unknown states.
+	 * If this is a kexec reboot, turn off Bus Master bit on the
+	 * device to tell it to not continue to do DMA. Don't touch
+	 * devices in D3cold or unknown states.
+	 * If it is not a kexec reboot, firmware will hit the PCI
+	 * devices with big hammer and stop their DMA any way.
 	 */
-	if (pci_dev->current_state <= PCI_D3hot)
+	if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
 		pci_clear_master(pci_dev);
+#endif
 }
 
 #ifdef CONFIG_PM

drivers/pci/remove.c

@@ -24,7 +24,7 @@ static void pci_stop_dev(struct pci_dev *dev)
 	if (dev->is_added) {
 		pci_proc_detach_device(dev);
 		pci_remove_sysfs_dev_files(dev);
-		device_del(&dev->dev);
+		device_release_driver(&dev->dev);
 		dev->is_added = 0;
 	}
 
@@ -34,6 +34,8 @@ static void pci_stop_dev(struct pci_dev *dev)
 
 static void pci_destroy_dev(struct pci_dev *dev)
 {
+	device_del(&dev->dev);
+
 	down_write(&pci_bus_sem);
 	list_del(&dev->bus_list);
 	up_write(&pci_bus_sem);

include/linux/kexec.h

@@ -198,6 +198,9 @@ extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 extern size_t vmcoreinfo_size;
 extern size_t vmcoreinfo_max_size;
 
+/* flag to track if kexec reboot is in progress */
+extern bool kexec_in_progress;
+
 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
 		unsigned long long *crash_size, unsigned long long *crash_base);
 int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,

include/linux/pci.h

@@ -1567,65 +1567,65 @@ enum pci_fixup_pass {
 /* Anonymous variables would be nice... */
 #define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, class,	\
 				  class_shift, hook)			\
-	static const struct pci_fixup __pci_fixup_##name __used		\
+	static const struct pci_fixup __PASTE(__pci_fixup_##name,__LINE__) __used	\
 	__attribute__((__section__(#section), aligned((sizeof(void *)))))    \
 		= { vendor, device, class, class_shift, hook };
 
 #define DECLARE_PCI_FIXUP_CLASS_EARLY(vendor, device, class,		\
 					 class_shift, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,			\
-		vendor##device##hook, vendor, device, class, class_shift, hook)
+		hook, vendor, device, class, class_shift, hook)
 #define DECLARE_PCI_FIXUP_CLASS_HEADER(vendor, device, class,		\
 					 class_shift, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,			\
-		vendor##device##hook, vendor, device, class, class_shift, hook)
+		hook, vendor, device, class, class_shift, hook)
 #define DECLARE_PCI_FIXUP_CLASS_FINAL(vendor, device, class,		\
 					 class_shift, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final,			\
-		vendor##device##hook, vendor, device, class, class_shift, hook)
+		hook, vendor, device, class, class_shift, hook)
 #define DECLARE_PCI_FIXUP_CLASS_ENABLE(vendor, device, class,		\
 					 class_shift, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable,			\
-		vendor##device##hook, vendor, device, class, class_shift, hook)
+		hook, vendor, device, class, class_shift, hook)
 #define DECLARE_PCI_FIXUP_CLASS_RESUME(vendor, device, class,		\
 					 class_shift, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume,			\
-		resume##vendor##device##hook, vendor, device, class,	\
+		resume##hook, vendor, device, class,	\
 		class_shift, hook)
 #define DECLARE_PCI_FIXUP_CLASS_RESUME_EARLY(vendor, device, class,	\
 					 class_shift, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume_early,		\
-		resume_early##vendor##device##hook, vendor, device,	\
+		resume_early##hook, vendor, device,	\
 		class, class_shift, hook)
 #define DECLARE_PCI_FIXUP_CLASS_SUSPEND(vendor, device, class,		\
 					 class_shift, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend,			\
-		suspend##vendor##device##hook, vendor, device, class,	\
+		suspend##hook, vendor, device, class,	\
 		class_shift, hook)
 
 #define DECLARE_PCI_FIXUP_EARLY(vendor, device, hook)			\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,			\
-		vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
+		hook, vendor, device, PCI_ANY_ID, 0, hook)
 #define DECLARE_PCI_FIXUP_HEADER(vendor, device, hook)			\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,			\
-		vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
+		hook, vendor, device, PCI_ANY_ID, 0, hook)
 #define DECLARE_PCI_FIXUP_FINAL(vendor, device, hook)			\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final,			\
-		vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
+		hook, vendor, device, PCI_ANY_ID, 0, hook)
 #define DECLARE_PCI_FIXUP_ENABLE(vendor, device, hook)			\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable,			\
-		vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
+		hook, vendor, device, PCI_ANY_ID, 0, hook)
 #define DECLARE_PCI_FIXUP_RESUME(vendor, device, hook)			\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume,			\
-		resume##vendor##device##hook, vendor, device,		\
+		resume##hook, vendor, device,		\
 		PCI_ANY_ID, 0, hook)
 #define DECLARE_PCI_FIXUP_RESUME_EARLY(vendor, device, hook)		\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume_early,		\
-		resume_early##vendor##device##hook, vendor, device,	\
+		resume_early##hook, vendor, device,	\
 		PCI_ANY_ID, 0, hook)
 #define DECLARE_PCI_FIXUP_SUSPEND(vendor, device, hook)			\
 	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend,			\
-		suspend##vendor##device##hook, vendor, device,		\
+		suspend##hook, vendor, device,		\
 		PCI_ANY_ID, 0, hook)
 
 #ifdef CONFIG_PCI_QUIRKS

kernel/kexec.c

@@ -47,6 +47,9 @@ u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 size_t vmcoreinfo_size;
 size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
 
+/* Flag to indicate we are going to kexec a new kernel */
+bool kexec_in_progress = false;
+
 /* Location of the reserved area for the crash kernel */
 struct resource crashk_res = {
 	.name  = "Crash kernel",
@@ -1675,6 +1678,7 @@ int kernel_kexec(void)
 	} else
 #endif
 	{
+		kexec_in_progress = true;
 		kernel_restart_prepare(NULL);
 		printk(KERN_EMERG "Starting new kernel\n");
 		machine_shutdown();

kernel/workqueue.c

@@ -2851,19 +2851,6 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr)
 	return false;
 }
 
-static bool __flush_work(struct work_struct *work)
-{
-	struct wq_barrier barr;
-
-	if (start_flush_work(work, &barr)) {
-		wait_for_completion(&barr.done);
-		destroy_work_on_stack(&barr.work);
-		return true;
-	} else {
-		return false;
-	}
-}
-
 /**
  * flush_work - wait for a work to finish executing the last queueing instance
  * @work: the work to flush
@@ -2877,10 +2864,18 @@ static bool __flush_work(struct work_struct *work)
  */
 bool flush_work(struct work_struct *work)
 {
+	struct wq_barrier barr;
+
 	lock_map_acquire(&work->lockdep_map);
 	lock_map_release(&work->lockdep_map);
 
-	return __flush_work(work);
+	if (start_flush_work(work, &barr)) {
+		wait_for_completion(&barr.done);
+		destroy_work_on_stack(&barr.work);
+		return true;
+	} else {
+		return false;
+	}
 }
 EXPORT_SYMBOL_GPL(flush_work);
 
@@ -4832,14 +4827,7 @@ long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
 
 	INIT_WORK_ONSTACK(&wfc.work, work_for_cpu_fn);
 	schedule_work_on(cpu, &wfc.work);
-
-	/*
-	 * The work item is on-stack and can't lead to deadlock through
-	 * flushing.  Use __flush_work() to avoid spurious lockdep warnings
-	 * when work_on_cpu()s are nested.
-	 */
-	__flush_work(&wfc.work);
-
+	flush_work(&wfc.work);
 	return wfc.ret;
 }
 EXPORT_SYMBOL_GPL(work_on_cpu);