[PATCH kernel 1/5] powerpc/powernv/npu: Add helper to access struct npu for NPU device

[Alexey Kardashevskiy]

This step is to help removing the npu struct from pnv_phb so it
can be used by pseries as well.

Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
---
 arch/powerpc/platforms/powernv/npu-dma.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index 3a5c4ed..13e5153 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -389,6 +389,18 @@ struct pnv_ioda_pe *pnv_pci_npu_setup_iommu(struct pnv_ioda_pe *npe)
 	return gpe;
 }
 
+/*
+ * NPU2 ATS
+ */
+static struct npu *npdev_to_npu(struct pci_dev *npdev)
+{
+	struct pnv_phb *nphb;
+
+	nphb = pci_bus_to_host(npdev->bus)->private_data;
+
+	return &nphb->npu;
+}
+
 /* Maximum number of nvlinks per npu */
 #define NV_MAX_LINKS 6
 
@@ -546,7 +558,6 @@ static void acquire_atsd_reg(struct npu_context *npu_context,
 	int i, j;
 	struct npu *npu;
 	struct pci_dev *npdev;
-	struct pnv_phb *nphb;
 
 	for (i = 0; i <= max_npu2_index; i++) {
 		mmio_atsd_reg[i].reg = -1;
@@ -561,8 +572,7 @@ static void acquire_atsd_reg(struct npu_context *npu_context,
 			if (!npdev)
 				continue;
 
-			nphb = pci_bus_to_host(npdev->bus)->private_data;
-			npu = &nphb->npu;
+			npu = npdev_to_npu(npdev);
 			mmio_atsd_reg[i].npu = npu;
 			mmio_atsd_reg[i].reg = get_mmio_atsd_reg(npu);
 			while (mmio_atsd_reg[i].reg < 0) {
@@ -749,7 +759,7 @@ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev,
 	}
 
 	nphb = pci_bus_to_host(npdev->bus)->private_data;
-	npu = &nphb->npu;
+	npu = npdev_to_npu(npdev);
 
 	/*
 	 * Setup the NPU context table for a particular GPU. These need to be
@@ -869,7 +879,7 @@ void pnv_npu2_destroy_context(struct npu_context *npu_context,
 		return;
 
 	nphb = pci_bus_to_host(npdev->bus)->private_data;
-	npu = &nphb->npu;
+	npu = npdev_to_npu(npdev);
 	nvlink_dn = of_parse_phandle(npdev->dev.of_node, "ibm,nvlink", 0);
 	if (WARN_ON(of_property_read_u32(nvlink_dn, "ibm,npu-link-index",
 							&nvlink_index)))
-- 
2.11.0