linux-kernel - [PATCH] vme: lower alignment requirement in pci bridge drivers

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Message-Id: <1436366537-28094-1-git-send-email-dmitry.kalinkin@gmail.com>
Date:	Wed,  8 Jul 2015 17:42:17 +0300
From:	Dmitry Kalinkin <dmitry.kalinkin@...il.com>
To:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Cc:	Martyn Welch <martyn.welch@...com>,
	Manohar Vanga <manohar.vanga@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Kalinkin <dmitry.kalinkin@...il.com>
Subject: [PATCH] vme: lower alignment requirement in pci bridge drivers

Universe II allows PCI address grannularity of 4K or 64K depending on
the window id. tsi148 only supports 64K. Existing driver implementations
are validating window size against this grannularity and then use that
very size as alignment parameter to pci_bus_alloc_resource.  This
constraint is excessive, alignment by granularity should be enough.

This changes alignment constraint from size to a fixed constraint of
64K.

Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@...il.com>
---
 drivers/vme/bridges/vme_ca91cx42.c | 2 +-
 drivers/vme/bridges/vme_tsi148.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vme/bridges/vme_ca91cx42.c b/drivers/vme/bridges/vme_ca91cx42.c
index 834883d..b79a74a 100644
--- a/drivers/vme/bridges/vme_ca91cx42.c
+++ b/drivers/vme/bridges/vme_ca91cx42.c
@@ -553,7 +553,7 @@ static int ca91cx42_alloc_resource(struct vme_master_resource *image,
 	image->bus_resource.flags = IORESOURCE_MEM;
 
 	retval = pci_bus_alloc_resource(pdev->bus,
-		&image->bus_resource, size, size, PCIBIOS_MIN_MEM,
+		&image->bus_resource, size, 0x10000, PCIBIOS_MIN_MEM,
 		0, NULL, NULL);
 	if (retval) {
 		dev_err(ca91cx42_bridge->parent, "Failed to allocate mem "
diff --git a/drivers/vme/bridges/vme_tsi148.c b/drivers/vme/bridges/vme_tsi148.c
index b0132e0..d1e383b 100644
--- a/drivers/vme/bridges/vme_tsi148.c
+++ b/drivers/vme/bridges/vme_tsi148.c
@@ -768,7 +768,7 @@ static int tsi148_alloc_resource(struct vme_master_resource *image,
 	image->bus_resource.flags = IORESOURCE_MEM;
 
 	retval = pci_bus_alloc_resource(pdev->bus,
-		&image->bus_resource, size, size, PCIBIOS_MIN_MEM,
+		&image->bus_resource, size, 0x10000, PCIBIOS_MIN_MEM,
 		0, NULL, NULL);
 	if (retval) {
 		dev_err(tsi148_bridge->parent, "Failed to allocate mem "
-- 
1.8.3.1

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