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authorNiklas Schnelle <schnelle@linux.ibm.com>2022-10-25 14:56:53 +0300
committerJoerg Roedel <jroedel@suse.de>2022-11-03 17:40:53 +0300
commit1a3a7d64bbce3179401f4e691522ff992aa1b8a1 (patch)
tree7eb3984cd30197b5e8baf56e278b8d4f02b4dc60 /drivers/iommu/s390-iommu.c
parentbf8d2dd2ed0825a58f31cc510245a1eb46f8a87e (diff)
downloadlinux-1a3a7d64bbce3179401f4e691522ff992aa1b8a1.tar.xz
iommu/s390: Get rid of s390_domain_device
The struct s390_domain_device serves the sole purpose as list entry for the devices list of a struct s390_domain. As it contains no additional information besides a list_head and a pointer to the struct zpci_dev we can simplify things and just thread the device list through struct zpci_dev directly. This removes the need to allocate during domain attach and gets rid of one level of indirection during mapping operations. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Link: https://lore.kernel.org/r/20221025115657.1666860-3-schnelle@linux.ibm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/s390-iommu.c')
-rw-r--r--drivers/iommu/s390-iommu.c37
1 files changed, 7 insertions, 30 deletions
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index c2e5e81d609e..af83ccde16a4 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -29,11 +29,6 @@ struct s390_domain {
spinlock_t list_lock;
};
-struct s390_domain_device {
- struct list_head list;
- struct zpci_dev *zdev;
-};
-
static struct s390_domain *to_s390_domain(struct iommu_domain *dom)
{
return container_of(dom, struct s390_domain, domain);
@@ -87,21 +82,13 @@ static void s390_domain_free(struct iommu_domain *domain)
static void __s390_iommu_detach_device(struct zpci_dev *zdev)
{
struct s390_domain *s390_domain = zdev->s390_domain;
- struct s390_domain_device *domain_device, *tmp;
unsigned long flags;
if (!s390_domain)
return;
spin_lock_irqsave(&s390_domain->list_lock, flags);
- list_for_each_entry_safe(domain_device, tmp, &s390_domain->devices,
- list) {
- if (domain_device->zdev == zdev) {
- list_del(&domain_device->list);
- kfree(domain_device);
- break;
- }
- }
+ list_del_init(&zdev->iommu_list);
spin_unlock_irqrestore(&s390_domain->list_lock, flags);
zpci_unregister_ioat(zdev, 0);
@@ -114,17 +101,12 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
{
struct s390_domain *s390_domain = to_s390_domain(domain);
struct zpci_dev *zdev = to_zpci_dev(dev);
- struct s390_domain_device *domain_device;
unsigned long flags;
int cc, rc = 0;
if (!zdev)
return -ENODEV;
- domain_device = kzalloc(sizeof(*domain_device), GFP_KERNEL);
- if (!domain_device)
- return -ENOMEM;
-
if (zdev->s390_domain)
__s390_iommu_detach_device(zdev);
else if (zdev->dma_table)
@@ -132,10 +114,8 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(s390_domain->dma_table));
- if (cc) {
- rc = -EIO;
- goto out_free;
- }
+ if (cc)
+ return -EIO;
zdev->dma_table = s390_domain->dma_table;
spin_lock_irqsave(&s390_domain->list_lock, flags);
@@ -151,9 +131,8 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
rc = -EINVAL;
goto out_unregister;
}
- domain_device->zdev = zdev;
zdev->s390_domain = s390_domain;
- list_add(&domain_device->list, &s390_domain->devices);
+ list_add(&zdev->iommu_list, &s390_domain->devices);
spin_unlock_irqrestore(&s390_domain->list_lock, flags);
return 0;
@@ -161,8 +140,6 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
out_unregister:
zpci_unregister_ioat(zdev, 0);
zdev->dma_table = NULL;
-out_free:
- kfree(domain_device);
return rc;
}
@@ -206,10 +183,10 @@ static int s390_iommu_update_trans(struct s390_domain *s390_domain,
phys_addr_t pa, dma_addr_t dma_addr,
size_t size, int flags)
{
- struct s390_domain_device *domain_device;
phys_addr_t page_addr = pa & PAGE_MASK;
dma_addr_t start_dma_addr = dma_addr;
unsigned long irq_flags, nr_pages, i;
+ struct zpci_dev *zdev;
unsigned long *entry;
int rc = 0;
@@ -234,8 +211,8 @@ static int s390_iommu_update_trans(struct s390_domain *s390_domain,
}
spin_lock(&s390_domain->list_lock);
- list_for_each_entry(domain_device, &s390_domain->devices, list) {
- rc = zpci_refresh_trans((u64) domain_device->zdev->fh << 32,
+ list_for_each_entry(zdev, &s390_domain->devices, iommu_list) {
+ rc = zpci_refresh_trans((u64)zdev->fh << 32,
start_dma_addr, nr_pages * PAGE_SIZE);
if (rc)
break;