linux-kernel - [RFC v5 1/7] PCI: Ignore resource_alignment if PCI_PROBE

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Message-Id: <1459863813-2830-2-git-send-email-xyjxie@linux.vnet.ibm.com>
Date:	Tue,  5 Apr 2016 21:43:29 +0800
From:	Yongji Xie <xyjxie@...ux.vnet.ibm.com>
To:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-doc@...r.kernel.org
Cc:	bhelgaas@...gle.com, corbet@....net, aik@...abs.ru,
	alex.williamson@...hat.com, benh@...nel.crashing.org,
	paulus@...ba.org, mpe@...erman.id.au, warrier@...ux.vnet.ibm.com,
	zhong@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
	gwshan@...ux.vnet.ibm.com, Yongji Xie <xyjxie@...ux.vnet.ibm.com>
Subject: [RFC v5 1/7] PCI: Ignore resource_alignment if PCI_PROBE_ONLY was set

The resource_alignment will releases memory
resources allocated by firmware so that kernel
can reassign new resources later on. But this
will cause the problem that no resources can be
allocated by kernel if PCI_PROBE_ONLY was set,
e.g. on pSeries platform because PCI_PROBE_ONLY
force kernel to use firmware setup and not to
reassign any resources.

To solve this problem, this patch ignores
resource_alignment if PCI_PROBE_ONLY was set.

Signed-off-by: Yongji Xie <xyjxie@...ux.vnet.ibm.com>
---
 drivers/pci/pci.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 602eb42..1db9267 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4607,6 +4607,12 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
 	spin_lock(&resource_alignment_lock);
 	p = resource_alignment_param;
 	while (*p) {
+		if (pci_has_flag(PCI_PROBE_ONLY)) {
+			printk(KERN_ERR "PCI: Ignore resource_alignment parameter: %s with"
+					" PCI_PROBE_ONLY set\n", p);
+			*p = 0;
+			break;
+		}
 		count = 0;
 		if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
 							p[count] == '@') {
-- 
1.7.9.5