From: Chris Metcalf <cmetcalf@tilera.com>
Date: Mon, 12 Aug 2013 19:25:22 +0000 (-0400)
Subject: tile PCI RC: add comment about "PCI hole" problem
X-Git-Tag: next-20130822~108^2~11
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=41891b2da647d59071821f17b9db7de0ded166ed;p=karo-tx-linux.git

tile PCI RC: add comment about "PCI hole" problem

Explain the rationale of not overlapping the 64-bit DMA window
with the PA range.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
---

diff --git a/arch/tile/include/asm/pci.h b/arch/tile/include/asm/pci.h
index c99ad44233f4..dfedd7ac7298 100644
--- a/arch/tile/include/asm/pci.h
+++ b/arch/tile/include/asm/pci.h
@@ -122,6 +122,11 @@ static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
  * the CPA plus TILE_PCI_MEM_MAP_BASE_OFFSET. To support 32-bit
  * devices, we create a separate map region that handles the low
  * 4GB.
+ *
+ * This design lets us avoid the "PCI hole" problem where the host bridge
+ * won't pass DMA traffic with target addresses that happen to fall within the
+ * BAR space. This enables us to use all the physical memory for DMA, instead
+ * of wasting the same amount of physical memory as the BAR window size.
  */
 #define	TILE_PCI_MEM_MAP_BASE_OFFSET	(1ULL << CHIP_PA_WIDTH())