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Commit f42c2235 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/s390: Add support for iommu_device handling 



Add support for the iommu_device_register interface to make
the s390 hardware iommus visible to the iommu core and in
sysfs.

Acked-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent ef954844

arch/s390/include/asm/pci.h

+7 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 


#include <linux/pci.h>

#include <linux/mutex.h>

#include <linux/iommu.h>

#include <asm-generic/pci.h>

#include <asm/pci_clp.h>

#include <asm/pci_debug.h>
@@ -122,6 +123,8 @@ struct zpci_dev { 
	unsigned long	iommu_pages;

	unsigned int	next_bit;



	struct iommu_device iommu_dev;  /* IOMMU core handle */



	char res_name[16];

	struct zpci_bar_struct bars[PCI_BAR_COUNT];
@@ -174,6 +177,10 @@ int clp_enable_fh(struct zpci_dev *, u8); 
int clp_disable_fh(struct zpci_dev *);

int clp_get_state(u32 fid, enum zpci_state *state);



/* IOMMU Interface */

int zpci_init_iommu(struct zpci_dev *zdev);

void zpci_destroy_iommu(struct zpci_dev *zdev);



#ifdef CONFIG_PCI

/* Error handling and recovery */

void zpci_event_error(void *);

arch/s390/pci/pci.c

+8 −1
Original line number Diff line number Diff line
@@ -776,6 +776,7 @@ void pcibios_remove_bus(struct pci_bus *bus) 


	zpci_exit_slot(zdev);

	zpci_cleanup_bus_resources(zdev);

	zpci_destroy_iommu(zdev);

	zpci_free_domain(zdev);



	spin_lock(&zpci_list_lock);
@@ -848,11 +849,15 @@ int zpci_create_device(struct zpci_dev *zdev) 
	if (rc)

		goto out;



	rc = zpci_init_iommu(zdev);

	if (rc)

		goto out_free;



	mutex_init(&zdev->lock);

	if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {

		rc = zpci_enable_device(zdev);

		if (rc)

			goto out_free;

			goto out_destroy_iommu;

	}

	rc = zpci_scan_bus(zdev);

	if (rc)
@@ -869,6 +874,8 @@ int zpci_create_device(struct zpci_dev *zdev) 
out_disable:

	if (zdev->state == ZPCI_FN_STATE_ONLINE)

		zpci_disable_device(zdev);

out_destroy_iommu:

	zpci_destroy_iommu(zdev);

out_free:

	zpci_free_domain(zdev);

out:

drivers/iommu/s390-iommu.c

+35 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ 
 */

#define S390_IOMMU_PGSIZES	(~0xFFFUL)



static struct iommu_ops s390_iommu_ops;



struct s390_domain {

	struct iommu_domain	domain;

	struct list_head	devices;
@@ -166,11 +168,13 @@ static void s390_iommu_detach_device(struct iommu_domain *domain, 
static int s390_iommu_add_device(struct device *dev)

{

	struct iommu_group *group = iommu_group_get_for_dev(dev);

	struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;



	if (IS_ERR(group))

		return PTR_ERR(group);



	iommu_group_put(group);

	iommu_device_link(&zdev->iommu_dev, dev);



	return 0;

}
@@ -197,6 +201,7 @@ static void s390_iommu_remove_device(struct device *dev) 
			s390_iommu_detach_device(domain, dev);

	}



	iommu_device_unlink(&zdev->iommu_dev, dev);

	iommu_group_remove_device(dev);

}
@@ -327,6 +332,36 @@ static size_t s390_iommu_unmap(struct iommu_domain *domain, 
	return size;

}



int zpci_init_iommu(struct zpci_dev *zdev)

{

	int rc = 0;



	rc = iommu_device_sysfs_add(&zdev->iommu_dev, NULL, NULL,

				    "s390-iommu.%08x", zdev->fid);

	if (rc)

		goto out_err;



	iommu_device_set_ops(&zdev->iommu_dev, &s390_iommu_ops);



	rc = iommu_device_register(&zdev->iommu_dev);

	if (rc)

		goto out_sysfs;



	return 0;



out_sysfs:

	iommu_device_sysfs_remove(&zdev->iommu_dev);



out_err:

	return rc;

}



void zpci_destroy_iommu(struct zpci_dev *zdev)

{

	iommu_device_unregister(&zdev->iommu_dev);

	iommu_device_sysfs_remove(&zdev->iommu_dev);

}



static struct iommu_ops s390_iommu_ops = {

	.capable = s390_iommu_capable,

	.domain_alloc = s390_domain_alloc,