Merge tag 'pci-v4.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:
 "PCI changes:

   - add support for PCI on ARM64 boxes with ACPI. We already had this
     for theoretical spec-compliant hardware; now we're adding quirks
     for the actual hardware (Cavium, HiSilicon, Qualcomm, X-Gene)

   - add runtime PM support for hotplug ports

   - enable runtime suspend for Intel UHCI that uses platform-specific
     wakeup signaling

   - add yet another host bridge registration interface. We hope this is
     extensible enough to subsume the others

   - expose device revision in sysfs for DRM

   - to avoid device conflicts, make sure any VF BAR updates are done
     before enabling the VF

   - avoid unnecessary link retrains for ASPM

   - allow INTx masking on Mellanox devices that support it

   - allow access to non-standard VPD for Chelsio devices

   - update Broadcom iProc support for PAXB v2, PAXC v2, inbound DMA,
     etc

   - update Rockchip support for max-link-speed

   - add NVIDIA Tegra210 support

   - add Layerscape LS1046a support

   - update R-Car compatibility strings

   - add Qualcomm MSM8996 support

   - remove some uninformative bootup messages"

* tag 'pci-v4.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (115 commits)
  PCI: Enable access to non-standard VPD for Chelsio devices (cxgb3)
  PCI: Expand "VPD access disabled" quirk message
  PCI: pciehp: Remove loading message
  PCI: hotplug: Remove hotplug core message
  PCI: Remove service driver load/unload messages
  PCI/AER: Log AER IRQ when claiming Root Port
  PCI/AER: Log errors with PCI device, not PCIe service device
  PCI/AER: Remove unused version macros
  PCI/PME: Log PME IRQ when claiming Root Port
  PCI/PME: Drop unused support for PMEs from Root Complex Event Collectors
  PCI: Move config space size macros to pci_regs.h
  x86/platform/intel-mid: Constify mid_pci_platform_pm
  PCI/ASPM: Don't retrain link if ASPM not possible
  PCI: iproc: Skip check for legacy IRQ on PAXC buses
  PCI: pciehp: Leave power indicator on when enabling already-enabled slot
  PCI: pciehp: Prioritize data-link event over presence detect
  PCI: rcar: Add gen3 fallback compatibility string for pcie-rcar
  PCI: rcar: Use gen2 fallback compatibility last
  PCI: rcar-gen2: Use gen2 fallback compatibility last
  PCI: rockchip: Move the deassert of pm/aclk/pclk after phy_init()
  ..

1 files changed, 22 insertions, 8 deletions

diff --git a/drivers/pci/host/vmd.c b/drivers/pci/host/vmd.c
index 37e29b580be3..18ef1a93c10a 100644
--- a/drivers/pci/host/vmd.c
+++ b/drivers/pci/host/vmd.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/msi.h>
 #include <linux/pci.h>
+#include <linux/srcu.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 
@@ -39,7 +40,6 @@ static DEFINE_RAW_SPINLOCK(list_lock);
 /**
  * struct vmd_irq - private data to map driver IRQ to the VMD shared vector
  * @node:       list item for parent traversal.
- * @rcu:        RCU callback item for freeing.
  * @irq:        back pointer to parent.
  * @enabled:    true if driver enabled IRQ
  * @virq:       the virtual IRQ value provided to the requesting driver.
@@ -49,7 +49,6 @@ static DEFINE_RAW_SPINLOCK(list_lock);
  */
 struct vmd_irq {
         struct list_head        node;
-        struct rcu_head         rcu;
         struct vmd_irq_list     *irq;
         bool                    enabled;
         unsigned int            virq;
@@ -58,11 +57,13 @@ struct vmd_irq {
 /**
  * struct vmd_irq_list - list of driver requested IRQs mapping to a VMD vector
  * @irq_list:   the list of irq's the VMD one demuxes to.
+ * @srcu:       SRCU struct for local synchronization.
  * @count:      number of child IRQs assigned to this vector; used to track
  *              sharing.
  */
 struct vmd_irq_list {
         struct list_head        irq_list;
+        struct srcu_struct      srcu;
         unsigned int            count;
 };
 
@@ -224,14 +225,14 @@ static void vmd_msi_free(struct irq_domain *domain,
         struct vmd_irq *vmdirq = irq_get_chip_data(virq);
         unsigned long flags;
 
-        synchronize_rcu();
+        synchronize_srcu(&vmdirq->irq->srcu);
 
         /* XXX: Potential optimization to rebalance */
         raw_spin_lock_irqsave(&list_lock, flags);
         vmdirq->irq->count--;
         raw_spin_unlock_irqrestore(&list_lock, flags);
 
-        kfree_rcu(vmdirq, rcu);
+        kfree(vmdirq);
 }
 
 static int vmd_msi_prepare(struct irq_domain *domain, struct device *dev,
@@ -646,11 +647,12 @@ static irqreturn_t vmd_irq(int irq, void *data)
 {
         struct vmd_irq_list *irqs = data;
         struct vmd_irq *vmdirq;
+        int idx;
 
-        rcu_read_lock();
+        idx = srcu_read_lock(&irqs->srcu);
         list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
                 generic_handle_irq(vmdirq->virq);
-        rcu_read_unlock();
+        srcu_read_unlock(&irqs->srcu, idx);
 
         return IRQ_HANDLED;
 }
@@ -696,6 +698,10 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
                 return -ENOMEM;
 
         for (i = 0; i < vmd->msix_count; i++) {
+                err = init_srcu_struct(&vmd->irqs[i].srcu);
+                if (err)
+                        return err;
+
                 INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
                 err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
                                        vmd_irq, 0, "vmd", &vmd->irqs[i]);
@@ -714,12 +720,20 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
         return 0;
 }
 
+static void vmd_cleanup_srcu(struct vmd_dev *vmd)
+{
+        int i;
+
+        for (i = 0; i < vmd->msix_count; i++)
+                cleanup_srcu_struct(&vmd->irqs[i].srcu);
+}
+
 static void vmd_remove(struct pci_dev *dev)
 {
         struct vmd_dev *vmd = pci_get_drvdata(dev);
 
         vmd_detach_resources(vmd);
-        pci_set_drvdata(dev, NULL);
+        vmd_cleanup_srcu(vmd);
         sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
         pci_stop_root_bus(vmd->bus);
         pci_remove_root_bus(vmd->bus);
@@ -727,7 +741,7 @@ static void vmd_remove(struct pci_dev *dev)
         irq_domain_remove(vmd->irq_domain);
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int vmd_suspend(struct device *dev)
 {
         struct pci_dev *pdev = to_pci_dev(dev);