linux-kernel - [PATCH 1/3] PCI: Introduce pcibios_ignore_alignment

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Message-Id: <20190508024151.5690-2-shawn@anastas.io>
Date:   Tue,  7 May 2019 21:41:49 -0500
From:   Shawn Anastasio <shawn@...stas.io>
To:     bhelgaas@...gle.com
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        sbobroff@...ux.ibm.com, xyjxie@...ux.vnet.ibm.com,
        rppt@...ux.ibm.com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 1/3] PCI: Introduce pcibios_ignore_alignment_request

Introduce a new pcibios function pcibios_ignore_alignment_request
which allows the PCI core to defer to platform-specific code to
determine whether or not to ignore alignment requests for PCI resources.

The existing behavior is to simply ignore alignment requests when
PCI_PROBE_ONLY is set. This is behavior is maintained by the
default implementation of pcibios_ignore_alignment_request.

Signed-off-by: Shawn Anastasio <shawn@...stas.io>
---
 drivers/pci/pci.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 766f5779db92..e7a925f2188e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5896,6 +5896,11 @@ resource_size_t __weak pcibios_default_alignment(void)
 	return 0;
 }
 
+int __weak pcibios_ignore_alignment_request(void)
+{
+	return pci_has_flag(PCI_PROBE_ONLY);
+}
+
 #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
 static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
 static DEFINE_SPINLOCK(resource_alignment_lock);
@@ -5920,9 +5925,9 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev,
 	p = resource_alignment_param;
 	if (!*p && !align)
 		goto out;
-	if (pci_has_flag(PCI_PROBE_ONLY)) {
+	if (pcibios_ignore_alignment_request()) {
 		align = 0;
-		pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n");
+		pr_info_once("PCI: Ignoring requested alignments\n");
 		goto out;
 	}
 
-- 
2.20.1