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Commit b08d2e61 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/host-vmd' into next 

* pci/host-vmd:
  PCI: vmd: Fix suspend handlers defined-but-not-used warning
  PCI: vmd: Use SRCU as a local RCU to prevent delaying global RCU
  PCI: vmd: Remove unnecessary pci_set_drvdata()
parents d34efd22 42db500a

drivers/pci/host/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -288,7 +288,7 @@ config PCIE_ROCKCHIP 
	  4 slots.



config VMD

	depends on PCI_MSI && X86_64

	depends on PCI_MSI && X86_64 && SRCU

	tristate "Intel Volume Management Device Driver"

	default N

	---help---

drivers/pci/host/vmd.c

+22 −8
Original line number Diff line number Diff line
@@ -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);