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sparc64: Bind PCIe devices to use IOMMU v2 service 

In order to use Hypervisor (HV) IOMMU v2 API for map/demap, each PCIe
device has to be bound to IOTSB using HV API pci_iotsb_bind().

Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com>
Reviewed-by: chris hyser <chris.hyser@oracle.com>
Acked-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tushar Dave 2016-10-28 10:12:43 -07:00 committed by David S. Miller
parent 31f077dc7d
commit 5116ab4eab
3 changed files with 60 additions and 0 deletions
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43
arch/sparc/kernel/pci_sun4v.c
View File

@ -216,6 +216,43 @@ static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
return NULL;
}
unsigned long dma_4v_iotsb_bind(unsigned long devhandle,
unsigned long iotsb_num,
struct pci_bus *bus_dev)
{
struct pci_dev *pdev;
unsigned long err;
unsigned int bus;
unsigned int device;
unsigned int fun;
list_for_each_entry(pdev, &bus_dev->devices, bus_list) {
if (pdev->subordinate) {
/* No need to bind pci bridge */
dma_4v_iotsb_bind(devhandle, iotsb_num,
pdev->subordinate);
} else {
bus = bus_dev->number;
device = PCI_SLOT(pdev->devfn);
fun = PCI_FUNC(pdev->devfn);
err = pci_sun4v_iotsb_bind(devhandle, iotsb_num,
HV_PCI_DEVICE_BUILD(bus,
device,
fun));
/* If bind fails for one device it is going to fail
* for rest of the devices because we are sharing
* IOTSB. So in case of failure simply return with
* error.
*/
if (err)
return err;
}
}
return 0;
}
static void dma_4v_iommu_demap(void *demap_arg, unsigned long entry,
unsigned long npages)
{
@ -629,6 +666,12 @@ static int pci_sun4v_atu_alloc_iotsb(struct pci_pbm_info *pbm)
}
iotsb->iotsb_num = iotsb_num;
err = dma_4v_iotsb_bind(pbm->devhandle, iotsb_num, pbm->pci_bus);
if (err) {
pr_err(PFX "pci_iotsb_bind failed error: %ld\n", err);
goto iotsb_conf_failed;
}
return 0;
iotsb_conf_failed:

3
arch/sparc/kernel/pci_sun4v.h
View File

@ -96,4 +96,7 @@ unsigned long pci_sun4v_iotsb_conf(unsigned long devhandle,
unsigned long page_size,
unsigned long dvma_base,
u64 *iotsb_num);
unsigned long pci_sun4v_iotsb_bind(unsigned long devhandle,
unsigned long iotsb_num,
unsigned int pci_device);
#endif /* !(_PCI_SUN4V_H) */

14
arch/sparc/kernel/pci_sun4v_asm.S
View File

@ -378,3 +378,17 @@ ENTRY(pci_sun4v_iotsb_conf)
retl
stx %o1, [%g1]
ENDPROC(pci_sun4v_iotsb_conf)
/*
* %o0: devhandle
* %o1: iotsb_num/iotsb_handle
* %o2: pci_device
*
* returns %o0: status
*/
ENTRY(pci_sun4v_iotsb_bind)
mov HV_FAST_PCI_IOTSB_BIND, %o5
ta HV_FAST_TRAP
retl
nop
ENDPROC(pci_sun4v_iotsb_bind)