linux-kernel - [PATCH v2 03/49] PCI: Use correct align for optional only resources during sorting

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Message-Id: <1436914040-13206-4-git-send-email-yinghai@kernel.org>
Date:	Tue, 14 Jul 2015 15:46:34 -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>
Subject: [PATCH v2 03/49] PCI: Use correct align for optional only resources during sorting

During sorting before assign, we only put resource with non-zero align
in the sorted list, so for optional resources that must size is 0 and only
have addon parts, we need to have correct align.

While treating SRIOV as optional resources, we always read alignment for
SRIOV bars, so they are ok.
Hotplug bridge resources are using STARTALIGN so it is ok when size is 0
if we have correct start for them.

Later we want to treat the ROM BAR as optional resource, and it has
have SIZEALIGN, we need to find a way to get align for them.

We can use addon resource align instead in that case, and it will
be ok for SRIOV path and hotplug bridge resource path.

Sorted list will contain must resource align/size to 0/0 to hold spot for
optional resources.

We need to pass realloc_head from sizing stage to sorting stage, and
get entry from realloc list and calculate align from the entry.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=81431
Reported-by: TJ <linux@....tj>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/setup-bus.c | 50 ++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 43 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 247d8fe..27cb0f0 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -145,9 +145,43 @@ static resource_size_t get_res_add_align(struct list_head *head,
 	return dev_res->min_align;
 }
 
+static resource_size_t __pci_resource_alignment(
+				struct pci_dev *dev,
+				struct resource *r,
+				struct list_head *realloc_head)
+{
+	resource_size_t r_align = pci_resource_alignment(dev, r);
+	resource_size_t orig_start, orig_end;
+	struct pci_dev_resource *dev_res;
+
+	if (r_align || !realloc_head)
+		return r_align;
+
+	dev_res = res_to_dev_res(realloc_head, r);
+	if (!dev_res || !dev_res->add_size)
+		return r_align;
+
+	orig_start = r->start;
+	orig_end = r->end;
+	r->end += dev_res->add_size;
+	if ((r->flags & IORESOURCE_STARTALIGN)) {
+		resource_size_t r_size = resource_size(r);
+		resource_size_t add_align = dev_res->min_align;
+
+		r->start = add_align;
+		r->end = add_align + r_size - 1;
+	}
+	r_align = pci_resource_alignment(dev, r);
+	r->start = orig_start;
+	r->end = orig_end;
+
+	return r_align;
+}
 
 /* Sort resources by alignment */
-static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
+static void pdev_sort_resources(struct pci_dev *dev,
+				 struct list_head *realloc_head,
+				 struct list_head *head)
 {
 	int i;
 
@@ -165,7 +199,7 @@ static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 		if (!(r->flags) || r->parent)
 			continue;
 
-		r_align = pci_resource_alignment(dev, r);
+		r_align = __pci_resource_alignment(dev, r, realloc_head);
 		if (!r_align) {
 			dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
 				 i, r);
@@ -183,8 +217,9 @@ static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 		list_for_each_entry(dev_res, head, list) {
 			resource_size_t align;
 
-			align = pci_resource_alignment(dev_res->dev,
-							 dev_res->res);
+			align = __pci_resource_alignment(dev_res->dev,
+							 dev_res->res,
+							 realloc_head);
 
 			if (r_align > align) {
 				n = &dev_res->list;
@@ -197,6 +232,7 @@ static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 }
 
 static void __dev_sort_resources(struct pci_dev *dev,
+				 struct list_head *realloc_head,
 				 struct list_head *head)
 {
 	u16 class = dev->class >> 8;
@@ -213,7 +249,7 @@ static void __dev_sort_resources(struct pci_dev *dev,
 			return;
 	}
 
-	pdev_sort_resources(dev, head);
+	pdev_sort_resources(dev, realloc_head, head);
 }
 
 static inline void reset_resource(struct resource *res)
@@ -501,7 +537,7 @@ static void pdev_assign_resources_sorted(struct pci_dev *dev,
 {
 	LIST_HEAD(head);
 
-	__dev_sort_resources(dev, &head);
+	__dev_sort_resources(dev, add_head, &head);
 	__assign_resources_sorted(&head, add_head, fail_head);
 
 }
@@ -514,7 +550,7 @@ static void pbus_assign_resources_sorted(const struct pci_bus *bus,
 	LIST_HEAD(head);
 
 	list_for_each_entry(dev, &bus->devices, bus_list)
-		__dev_sort_resources(dev, &head);
+		__dev_sort_resources(dev, realloc_head, &head);
 
 	__assign_resources_sorted(&head, realloc_head, fail_head);
 }
-- 
1.8.4.5

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