[PATCH v6 06/42] powerpc/powernv: Simplify pnv_ioda_setup_pe_seg()

[Gavin Shan]

The original implementation of pnv_ioda_setup_pe_seg() configures
IO and M32 segments by separate logics, which can be merged by
by caching @seg_bitmap, @seg_size, @win in advance. The patch
shouldn't cause any behavioural changes.

Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 68 ++++++++++++++-----------------
 1 file changed, 31 insertions(+), 37 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 78b49a1..488a53e 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -2856,7 +2856,10 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
 	struct pci_bus_region region;
 	struct resource *res;
 	int i, index;
-	int rc;
+	unsigned int segsize;
+	unsigned long *segmap, *pe_segmap;
+	uint16_t win;
+	int64_t rc;
 
 	/*
 	 * NOTE: We only care PCI bus based PE for now. For PCI
@@ -2873,25 +2876,10 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
 		if (res->flags & IORESOURCE_IO) {
 			region.start = res->start - phb->ioda.io_pci_base;
 			region.end   = res->end - phb->ioda.io_pci_base;
-			index = region.start / phb->ioda.io_segsize;
-
-			while (index < phb->ioda.total_pe &&
-			       region.start <= region.end) {
-				set_bit(index, pe->io_segmap);
-				set_bit(index, phb->ioda.io_segmap);
-				rc = opal_pci_map_pe_mmio_window(phb->opal_id,
-					pe->pe_number, OPAL_IO_WINDOW_TYPE,
-					0, index);
-				if (rc != OPAL_SUCCESS) {
-					pr_err("%s: OPAL error %d when mapping IO "
-					       "segment #%d to PE#%d\n",
-					       __func__, rc, index, pe->pe_number);
-					break;
-				}
-
-				region.start += phb->ioda.io_segsize;
-				index++;
-			}
+			segsize      = phb->ioda.io_segsize;
+			segmap       = phb->ioda.io_segmap;
+			pe_segmap    = pe->io_segmap;
+			win          = OPAL_IO_WINDOW_TYPE;
 		} else if ((res->flags & IORESOURCE_MEM) &&
 			   !pnv_pci_is_mem_pref_64(res->flags)) {
 			region.start = res->start -
@@ -2900,25 +2888,31 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
 			region.end   = res->end -
 				       hose->mem_offset[0] -
 				       phb->ioda.m32_pci_base;
-			index = region.start / phb->ioda.m32_segsize;
-
-			while (index < phb->ioda.total_pe &&
-			       region.start <= region.end) {
-				set_bit(index, pe->m32_segmap);
-				set_bit(index, phb->ioda.m32_segmap);
-				rc = opal_pci_map_pe_mmio_window(phb->opal_id,
-					pe->pe_number, OPAL_M32_WINDOW_TYPE,
-					0, index);
-				if (rc != OPAL_SUCCESS) {
-					pr_err("%s: OPAL error %d when mapping M32 "
-					       "segment#%d to PE#%d",
-					       __func__, rc, index, pe->pe_number);
-					break;
-				}
+			segsize      = phb->ioda.m32_segsize;
+			segmap       = phb->ioda.m32_segmap;
+			pe_segmap    = pe->m32_segmap;
+			win          = OPAL_M32_WINDOW_TYPE;
+		} else {
+			continue;
+		}
 
-				region.start += phb->ioda.m32_segsize;
-				index++;
+		index = region.start / phb->ioda.io_segsize;
+		while (index < phb->ioda.total_pe &&
+		       region.start <= region.end) {
+			set_bit(index, segmap);
+			set_bit(index, pe_segmap);
+			rc = opal_pci_map_pe_mmio_window(phb->opal_id,
+					pe->pe_number, win, 0, index);
+			if (rc != OPAL_SUCCESS) {
+				pr_warn("%s: Error %lld mapping (%d) seg#%d to PHB#%d-PE#%d\n",
+					__func__, rc, win, index,
+					pe->phb->hose->global_number,
+					pe->pe_number);
+				break;
 			}
+
+			region.start += segsize;
+			index++;
 		}
 	}
 }
-- 
2.1.0