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| author | Tushar Dave <tushar.n.dave@oracle.com> | 2016-10-28 10:12:43 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-18 11:16:59 -0800 |
| commit | 5116ab4eabed575b7cca61a6e89b7d6fb7440970 (patch) | |
| tree | caa1c853c629845f71228a52899013b7c474497f | |
| parent | 31f077dc7dffd4a444932a9fe7fe84d9c7b90b73 (diff) | |
| download | linux-kexec-5116ab4eabed575b7cca61a6e89b7d6fb7440970.tar.gz | |
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>
| -rw-r--r-- | arch/sparc/kernel/pci_sun4v.c | 43 | ||||
| -rw-r--r-- | arch/sparc/kernel/pci_sun4v.h | 3 | ||||
| -rw-r--r-- | arch/sparc/kernel/pci_sun4v_asm.S | 14 |
3 files changed, 60 insertions, 0 deletions
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c index 242477cbfdf209..d4208aa933830c 100644 --- a/arch/sparc/kernel/pci_sun4v.c +++ b/arch/sparc/kernel/pci_sun4v.c @@ -216,6 +216,43 @@ range_alloc_fail: 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: diff --git a/arch/sparc/kernel/pci_sun4v.h b/arch/sparc/kernel/pci_sun4v.h index 0ef6d1c456e7e9..1019e0fe6e9dd0 100644 --- a/arch/sparc/kernel/pci_sun4v.h +++ b/arch/sparc/kernel/pci_sun4v.h @@ -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) */ diff --git a/arch/sparc/kernel/pci_sun4v_asm.S b/arch/sparc/kernel/pci_sun4v_asm.S index fd94d0e4a41d97..22024a96c31755 100644 --- a/arch/sparc/kernel/pci_sun4v_asm.S +++ b/arch/sparc/kernel/pci_sun4v_asm.S @@ -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) |