linux-kernel - [PATCH 3/5 v2] PCI: make SRIOV resources optional

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Message-Id: <1309477662-18680-4-git-send-email-linuxram@us.ibm.com>
Date:	Thu, 30 Jun 2011 16:47:40 -0700
From:	Ram Pai <linuxram@...ibm.com>
To:	jbarnes@...tuousgeek.org, torvalds@...ux-foundation.org
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	yinghai@...nel.org, bhutchings@...arflare.com,
	socketcan@...tkopp.net, bhelgaas@...gle.com,
	linux@...inikbrodowski.net, Ram Pai <linuxram@...ibm.com>
Subject: [PATCH 3/5 v2] PCI: make SRIOV resources optional

From: Yinghai Lu <yinghai@...nel.org>

From: Yinghai Lu <yinghai@...nel.org>

Allocate resources to SRIOV BARs only after all other required
resource-requests are satisfied. Dont retry if resource allocation for SRIOV
BARs fail.

Signed-off-by: Ram Pai <linuxram@...ibm.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/setup-bus.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 9f2f15f..a0555cb 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -669,6 +669,16 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			if (r->parent || (r->flags & mask) != type)
 				continue;
 			r_size = resource_size(r);
+#ifdef CONFIG_PCI_IOV
+			/* put SRIOV requested res to the optional list */
+			if (add_head && i >= PCI_IOV_RESOURCES &&
+					i <= PCI_IOV_RESOURCE_END) {
+				r->end = r->start - 1;
+				add_to_list(add_head, dev, r, r_size, 1);
+				children_add_size += r_size;
+				continue;
+			}
+#endif
 			/* For bridges size != alignment */
 			align = pci_resource_alignment(dev, r);
 			order = __ffs(align) - 20;
-- 
1.7.0.4

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