linux-kernel - [PATCH v10 18/59] PCI: Set resource to FIXED for LSI devices

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Date:	Wed, 24 Feb 2016 18:12:09 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>,
	Khalid Aziz <khalid.aziz@...cle.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>, stable@...r.kernel.org
Subject: [PATCH v10 18/59] PCI: Set resource to FIXED for LSI devices

LSI HBA firmware stop responding pci read from host if pci core ever change
pci device BAR values.

Set their resources to FIXED, so let realloc to skip them.

Reported-by: Paul Johnson <pjay@...rail.com>
Suggested-by: Bjorn Helgaas <bhelgaas@...gle.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=92351
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: stable@...r.kernel.org
---
 drivers/pci/pci.h       |  1 +
 drivers/pci/quirks.c    | 20 ++++++++++++++++++++
 drivers/pci/setup-bus.c |  4 ++++
 3 files changed, 25 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 220bd0e..60d1c87 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -170,6 +170,7 @@ static inline void pci_msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u
 }
 
 void pci_realloc_get_opt(char *);
+bool pci_realloc_user_enabled(void);
 
 static inline int pci_no_d1d2(struct pci_dev *dev)
 {
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 47921a1..8d1f75f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -335,6 +335,26 @@ static void quirk_s3_64M(struct pci_dev *dev)
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S3,	PCI_DEVICE_ID_S3_868,		quirk_s3_64M);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S3,	PCI_DEVICE_ID_S3_968,		quirk_s3_64M);
 
+/*
+ * LSI devices firmware does not like BAR get changed
+ */
+static void quirk_bar_fixed(struct pci_dev *dev)
+{
+	int i;
+
+	if (pci_realloc_user_enabled())
+		return;
+
+	for (i = 0; i < PCI_STD_RESOURCE_END; i++) {
+		struct resource *r = &dev->resource[i];
+
+		if (!r->start || !r->flags)
+			continue;
+		r->flags |= IORESOURCE_PCI_FIXED;
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC,	PCI_ANY_ID,	quirk_bar_fixed);
+
 /* for pci remove and rescan */
 static void quirk_allocate_fixed(struct pci_dev *dev)
 {
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 05769c4..f9cd04a 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1678,6 +1678,10 @@ void __init pci_realloc_get_opt(char *str)
 	else if (!strncmp(str, "on", 2))
 		pci_realloc_enable = user_enabled;
 }
+bool pci_realloc_user_enabled(void)
+{
+	return pci_realloc_enable == user_enabled;
+}
 static bool pci_realloc_enabled(enum enable_type enable)
 {
 	return enable >= user_enabled;
-- 
1.8.4.5