Re: [PATCH v8 09/45] powerpc/powernv: Simplify pnv_ioda_setup_pe_seg()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 02/17/2016 02:43 PM, Gavin Shan wrote:
The original implementation of pnv_ioda_setup_pe_seg() configures
IO and M32 segments by separate logics, which can be merged by
by caching @segmap, @seg_size, @win in advance. This shouldn't
cause any behavioural changes.
>
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
  arch/powerpc/platforms/powernv/pci-ioda.c | 62 ++++++++++++++-----------------
  1 file changed, 28 insertions(+), 34 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 44cc5f3..fd7d382 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -2940,8 +2940,10 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
  	struct pnv_phb *phb = hose->private_data;
  	struct pci_bus_region region;
  	struct resource *res;
-	int i, index;
-	int rc;
+	unsigned int segsize;
+	int *segmap, index, i;
+	uint16_t win;
+	int64_t rc;

  	/*
  	 * NOTE: We only care PCI bus based PE for now. For PCI
@@ -2958,23 +2960,9 @@ 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_num &&
-			       region.start <= region.end) {
-				phb->ioda.io_segmap[index] = pe->pe_number;
-				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;
+			win          = OPAL_IO_WINDOW_TYPE;
  		} else if ((res->flags & IORESOURCE_MEM) &&
  			   !pnv_pci_is_mem_pref_64(res->flags)) {
  			region.start = res->start -
@@ -2983,23 +2971,29 @@ 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_num &&
-			       region.start <= region.end) {
-				phb->ioda.m32_segmap[index] = pe->pe_number;
-				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;
+			win          = OPAL_M32_WINDOW_TYPE;
+		} else {
+			continue;
+		}

-				region.start += phb->ioda.m32_segsize;
-				index++;
+		index = region.start / segsize;
+		while (index < phb->ioda.total_pe_num &&
+		       region.start <= region.end) {
+			segmap[index] = pe->pe_number;
+			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;

Please move this loop to a helper and stop caching segsize/segmap/win; this will make the code easier to read and the next patch will look much cleaner as it will not have to move this exact loop.


  			}
+
+			region.start += segsize;
+			index++;
  		}
  	}
  }



--
Alexey
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux