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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2015-08-27 15:33:03 +0200
committerJoerg Roedel <jroedel@suse.de>2015-10-06 12:20:24 +0200
commit8128f23c436d0dd4f72412e1bf9256e424479dc3 (patch)
treefa98a41a6b55c0108fa8f5724a8edc4d124a56ff /arch/s390/pci/pci_dma.c
parentLinux 4.3-rc4 (diff)
downloadlinux-8128f23c436d0dd4f72412e1bf9256e424479dc3.tar.xz
linux-8128f23c436d0dd4f72412e1bf9256e424479dc3.zip
iommu/s390: Add iommu api for s390 pci devices
This adds an IOMMU API implementation for s390 PCI devices. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'arch/s390/pci/pci_dma.c')
-rw-r--r--arch/s390/pci/pci_dma.c37
1 files changed, 25 insertions, 12 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 37505b8b4093..37d10f74425a 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -24,7 +24,7 @@ static int zpci_refresh_global(struct zpci_dev *zdev)
zdev->iommu_pages * PAGE_SIZE);
}
-static unsigned long *dma_alloc_cpu_table(void)
+unsigned long *dma_alloc_cpu_table(void)
{
unsigned long *table, *entry;
@@ -114,12 +114,12 @@ static unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr
return &pto[px];
}
-static void dma_update_cpu_trans(struct zpci_dev *zdev, void *page_addr,
- dma_addr_t dma_addr, int flags)
+void dma_update_cpu_trans(unsigned long *dma_table, void *page_addr,
+ dma_addr_t dma_addr, int flags)
{
unsigned long *entry;
- entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
+ entry = dma_walk_cpu_trans(dma_table, dma_addr);
if (!entry) {
WARN_ON_ONCE(1);
return;
@@ -156,7 +156,8 @@ static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa,
goto no_refresh;
for (i = 0; i < nr_pages; i++) {
- dma_update_cpu_trans(zdev, page_addr, dma_addr, flags);
+ dma_update_cpu_trans(zdev->dma_table, page_addr, dma_addr,
+ flags);
page_addr += PAGE_SIZE;
dma_addr += PAGE_SIZE;
}
@@ -181,7 +182,7 @@ no_refresh:
return rc;
}
-static void dma_free_seg_table(unsigned long entry)
+void dma_free_seg_table(unsigned long entry)
{
unsigned long *sto = get_rt_sto(entry);
int sx;
@@ -193,21 +194,18 @@ static void dma_free_seg_table(unsigned long entry)
dma_free_cpu_table(sto);
}
-static void dma_cleanup_tables(struct zpci_dev *zdev)
+void dma_cleanup_tables(unsigned long *table)
{
- unsigned long *table;
int rtx;
- if (!zdev || !zdev->dma_table)
+ if (!table)
return;
- table = zdev->dma_table;
for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
if (reg_entry_isvalid(table[rtx]))
dma_free_seg_table(table[rtx]);
dma_free_cpu_table(table);
- zdev->dma_table = NULL;
}
static unsigned long __dma_alloc_iommu(struct zpci_dev *zdev,
@@ -416,6 +414,13 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
{
int rc;
+ /*
+ * At this point, if the device is part of an IOMMU domain, this would
+ * be a strong hint towards a bug in the IOMMU API (common) code and/or
+ * simultaneous access via IOMMU and DMA API. So let's issue a warning.
+ */
+ WARN_ON(zdev->s390_domain);
+
spin_lock_init(&zdev->iommu_bitmap_lock);
spin_lock_init(&zdev->dma_table_lock);
@@ -450,8 +455,16 @@ out_clean:
void zpci_dma_exit_device(struct zpci_dev *zdev)
{
+ /*
+ * At this point, if the device is part of an IOMMU domain, this would
+ * be a strong hint towards a bug in the IOMMU API (common) code and/or
+ * simultaneous access via IOMMU and DMA API. So let's issue a warning.
+ */
+ WARN_ON(zdev->s390_domain);
+
zpci_unregister_ioat(zdev, 0);
- dma_cleanup_tables(zdev);
+ dma_cleanup_tables(zdev->dma_table);
+ zdev->dma_table = NULL;
vfree(zdev->iommu_bitmap);
zdev->iommu_bitmap = NULL;
zdev->next_bit = 0;