linux-kernel - [PATCH v2 46/49] PCI: Set resource to FIXED for lsi devices

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Date:	Tue, 14 Jul 2015 15:47:17 -0700
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>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>, stable@...r.kernel.org
Subject: [PATCH v2 46/49] 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 will allow 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 1804d44..dec1c18 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -168,6 +168,7 @@ 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 e9fd0e9..184a09e 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -324,6 +324,26 @@ 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->flags || r->flags & IORESOURCE_UNSET)
+			continue;
+		r->flags |= IORESOURCE_PCI_FIXED;
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC,	PCI_ANY_ID,	quirk_bar_fixed);
+
 static void quirk_io(struct pci_dev *dev, int pos, unsigned size,
 		     const char *name)
 {
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 9d5423c..d9cfb55 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -2196,6 +2196,10 @@ 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

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