powerpc/powernv: Add support for Nvlink NPUs

NVLink is a high speed interconnect that is used in conjunction with a
PCI-E connection to create an interface between CPU and GPU that
provides very high data bandwidth. A PCI-E connection to a GPU is used
as the control path to initiate and report status of large data
transfers sent via the NVLink.

On IBM Power systems the NVLink processing unit (NPU) is similar to
the existing PHB3. This patch adds support for a new NPU PHB type. DMA
operations on the NPU are not supported as this patch sets the TCE
translation tables to be the same as the related GPU PCIe device for
each NVLink. Therefore all DMA operations are setup and controlled via
the PCIe device.

EEH is not presently supported for the NPU devices, although it may be
added in future.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index c8ff50e90766..7f56313e8d72 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -7,6 +7,7 @@ enum pnv_phb_type {
 	PNV_PHB_P5IOC2	= 0,
 	PNV_PHB_IODA1	= 1,
 	PNV_PHB_IODA2	= 2,
+	PNV_PHB_NPU	= 3,
 };
 
 /* Precise PHB model for error management */
@@ -15,6 +16,7 @@ enum pnv_phb_model {
 	PNV_PHB_MODEL_P5IOC2,
 	PNV_PHB_MODEL_P7IOC,
 	PNV_PHB_MODEL_PHB3,
+	PNV_PHB_MODEL_NPU,
 };
 
 #define PNV_PCI_DIAG_BUF_SIZE	8192
@@ -24,6 +26,7 @@ enum pnv_phb_model {
 #define PNV_IODA_PE_MASTER	(1 << 3)	/* Master PE in compound case	*/
 #define PNV_IODA_PE_SLAVE	(1 << 4)	/* Slave PE in compound case	*/
 #define PNV_IODA_PE_VF		(1 << 5)	/* PE for one VF 		*/
+#define PNV_IODA_PE_PEER	(1 << 6)	/* PE has peers			*/
 
 /* Data associated with a PE, including IOMMU tracking etc.. */
 struct pnv_phb;
@@ -31,6 +34,9 @@ struct pnv_ioda_pe {
 	unsigned long		flags;
 	struct pnv_phb		*phb;
 
+#define PNV_IODA_MAX_PEER_PES	8
+	struct pnv_ioda_pe	*peers[PNV_IODA_MAX_PEER_PES];
+
 	/* A PE can be associated with a single device or an
 	 * entire bus (& children). In the former case, pdev
 	 * is populated, in the later case, pbus is.
@@ -229,6 +235,7 @@ extern void pnv_pci_setup_iommu_table(struct iommu_table *tbl,
 extern void pnv_pci_init_p5ioc2_hub(struct device_node *np);
 extern void pnv_pci_init_ioda_hub(struct device_node *np);
 extern void pnv_pci_init_ioda2_phb(struct device_node *np);
+extern void pnv_pci_init_npu_phb(struct device_node *np);
 extern void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
 					__be64 *startp, __be64 *endp, bool rm);
 extern void pnv_pci_reset_secondary_bus(struct pci_dev *dev);
@@ -238,4 +245,16 @@ extern void pnv_pci_dma_dev_setup(struct pci_dev *pdev);
 extern int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type);
 extern void pnv_teardown_msi_irqs(struct pci_dev *pdev);
 
+/* Nvlink functions */
+extern void pnv_npu_tce_invalidate_entire(struct pnv_ioda_pe *npe);
+extern void pnv_npu_tce_invalidate(struct pnv_ioda_pe *npe,
+				       struct iommu_table *tbl,
+				       unsigned long index,
+				       unsigned long npages,
+				       bool rm);
+extern void pnv_npu_init_dma_pe(struct pnv_ioda_pe *npe);
+extern void pnv_npu_setup_dma_pe(struct pnv_ioda_pe *npe);
+extern int pnv_npu_dma_set_bypass(struct pnv_ioda_pe *npe, bool enabled);
+extern int pnv_npu_dma_set_mask(struct pci_dev *npdev, u64 dma_mask);
+
 #endif /* __POWERNV_PCI_H */