1 files changed, 184 insertions, 47 deletions

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index a94ecc161208..89d0a6a88df7 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -33,6 +33,7 @@ struct resource_list_x {
         struct pci_dev *dev;
         resource_size_t start;
         resource_size_t end;
+        resource_size_t add_size;
         unsigned long flags;
 };
 
@@ -46,8 +47,18 @@ struct resource_list_x {
         (head)->next = NULL;                            \
 } while (0)
 
-static void add_to_failed_list(struct resource_list_x *head,
-                                 struct pci_dev *dev, struct resource *res)
+/**
+ * add_to_list() - add a new resource tracker to the list
+ * @head:       Head of the list
+ * @dev:        device corresponding to which the resource
+ *              belongs
+ * @res:        The resource to be tracked
+ * @add_size:   additional size to be optionally added
+ *              to the resource
+ */
+static void add_to_list(struct resource_list_x *head,
+                 struct pci_dev *dev, struct resource *res,
+                 resource_size_t add_size)
 {
         struct resource_list_x *list = head;
         struct resource_list_x *ln = list->next;
@@ -55,7 +66,7 @@ static void add_to_failed_list(struct resource_list_x *head,
 
         tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
         if (!tmp) {
-                pr_warning("add_to_failed_list: kmalloc() failed!\n");
+                pr_warning("add_to_list: kmalloc() failed!\n");
                 return;
         }
 
@@ -65,9 +76,16 @@ static void add_to_failed_list(struct resource_list_x *head,
         tmp->start = res->start;
         tmp->end = res->end;
         tmp->flags = res->flags;
+        tmp->add_size = add_size;
         list->next = tmp;
 }
 
+static void add_to_failed_list(struct resource_list_x *head,
+                                struct pci_dev *dev, struct resource *res)
+{
+        add_to_list(head, dev, res, 0);
+}
+
 static void __dev_sort_resources(struct pci_dev *dev,
                                  struct resource_list *head)
 {
@@ -95,18 +113,81 @@ static inline void reset_resource(struct resource *res)
         res->flags = 0;
 }
 
-static void __assign_resources_sorted(struct resource_list *head,
-                                 struct resource_list_x *fail_head)
+/**
+ * adjust_resources_sorted() - satisfy any additional resource requests
+ *
+ * @add_head : head of the list tracking requests requiring additional
+ *             resources
+ * @head     : head of the list tracking requests with allocated
+ *             resources
+ *
+ * Walk through each element of the add_head and try to procure
+ * additional resources for the element, provided the element
+ * is in the head list.
+ */
+static void adjust_resources_sorted(struct resource_list_x *add_head,
+                struct resource_list *head)
 {
         struct resource *res;
-        struct resource_list *list, *tmp;
+        struct resource_list_x *list, *tmp, *prev;
+        struct resource_list *hlist;
+        resource_size_t add_size;
         int idx;
 
-        for (list = head->next; list;) {
+        prev = add_head;
+        for (list = add_head->next; list;) {
                 res = list->res;
+                /* skip resource that has been reset */
+                if (!res->flags)
+                        goto out;
+
+                /* skip this resource if not found in head list */
+                for (hlist = head->next; hlist && hlist->res != res;
+                                hlist = hlist->next);
+                if (!hlist) { /* just skip */
+                        prev = list;
+                        list = list->next;
+                        continue;
+                }
+
                 idx = res - &list->dev->resource[0];
+                add_size=list->add_size;
+                if (!resource_size(res) && add_size) {
+                         res->end = res->start + add_size - 1;
+                         if(pci_assign_resource(list->dev, idx))
+                                reset_resource(res);
+                } else if (add_size) {
+                        adjust_resource(res, res->start,
+                                resource_size(res) + add_size);
+                }
+out:
+                tmp = list;
+                prev->next = list = list->next;
+                kfree(tmp);
+        }
+}
+
+/**
+ * assign_requested_resources_sorted() - satisfy resource requests
+ *
+ * @head : head of the list tracking requests for resources
+ * @failed_list : head of the list tracking requests that could
+ *              not be allocated
+ *
+ * Satisfy resource requests of each element in the list. Add
+ * requests that could not satisfied to the failed_list.
+ */
+static void assign_requested_resources_sorted(struct resource_list *head,
+                                 struct resource_list_x *fail_head)
+{
+        struct resource *res;
+        struct resource_list *list;
+        int idx;
 
-                if (pci_assign_resource(list->dev, idx)) {
+        for (list = head->next; list; list = list->next) {
+                res = list->res;
+                idx = res - &list->dev->resource[0];
+                if (resource_size(res) && pci_assign_resource(list->dev, idx)) {
                         if (fail_head && !pci_is_root_bus(list->dev->bus)) {
                                 /*
                                  * if the failed res is for ROM BAR, and it will
@@ -118,12 +199,23 @@ static void __assign_resources_sorted(struct resource_list *head,
                         }
                         reset_resource(res);
                 }
-                tmp = list;
-                list = list->next;
-                kfree(tmp);
         }
 }
 
+static void __assign_resources_sorted(struct resource_list *head,
+                                 struct resource_list_x *add_head,
+                                 struct resource_list_x *fail_head)
+{
+        /* Satisfy the must-have resource requests */
+        assign_requested_resources_sorted(head, fail_head);
+
+        /* Try to satisfy any additional nice-to-have resource
+                requests */
+        if (add_head)
+                adjust_resources_sorted(add_head, head);
+        free_list(resource_list, head);
+}
+
 static void pdev_assign_resources_sorted(struct pci_dev *dev,
                                  struct resource_list_x *fail_head)
 {
@@ -131,11 +223,12 @@ static void pdev_assign_resources_sorted(struct pci_dev *dev,
 
         head.next = NULL;
         __dev_sort_resources(dev, &head);
-        __assign_resources_sorted(&head, fail_head);
+        __assign_resources_sorted(&head, NULL, fail_head);
 
 }
 
 static void pbus_assign_resources_sorted(const struct pci_bus *bus,
+                                         struct resource_list_x *add_head,
                                          struct resource_list_x *fail_head)
 {
         struct pci_dev *dev;
@@ -145,7 +238,7 @@ static void pbus_assign_resources_sorted(const struct pci_bus *bus,
         list_for_each_entry(dev, &bus->devices, bus_list)
                 __dev_sort_resources(dev, &head);
 
-        __assign_resources_sorted(&head, fail_head);
+        __assign_resources_sorted(&head, add_head, fail_head);
 }
 
 void pci_setup_cardbus(struct pci_bus *bus)
@@ -443,15 +536,25 @@ static resource_size_t calculate_memsize(resource_size_t size,
         return size;
 }
 
-/* Sizing the IO windows of the PCI-PCI bridge is trivial,
-   since these windows have 4K granularity and the IO ranges
-   of non-bridge PCI devices are limited to 256 bytes.
-   We must be careful with the ISA aliasing though. */
-static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
+/**
+ * pbus_size_io() - size the io window of a given bus
+ *
+ * @bus : the bus
+ * @min_size : the minimum io window that must to be allocated
+ * @add_size : additional optional io window
+ * @add_head : track the additional io window on this list
+ *
+ * Sizing the IO windows of the PCI-PCI bridge is trivial,
+ * since these windows have 4K granularity and the IO ranges
+ * of non-bridge PCI devices are limited to 256 bytes.
+ * We must be careful with the ISA aliasing though.
+ */
+static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
+                resource_size_t add_size, struct resource_list_x *add_head)
 {
         struct pci_dev *dev;
         struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
-        unsigned long size = 0, size1 = 0;
+        unsigned long size = 0, size0 = 0, size1 = 0;
 
         if (!b_res)
                 return;
@@ -474,9 +577,12 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
                                 size1 += r_size;
                 }
         }
-        size = calculate_iosize(size, min_size, size1,
+        size0 = calculate_iosize(size, min_size, size1,
+                        resource_size(b_res), 4096);
+        size1 = !add_size? size0:
+                calculate_iosize(size, min_size+add_size, size1,
                         resource_size(b_res), 4096);
-        if (!size) {
+        if (!size0 && !size1) {
                 if (b_res->start || b_res->end)
                         dev_info(&bus->self->dev, "disabling bridge window "
                                  "%pR to [bus %02x-%02x] (unused)\n", b_res,
@@ -486,17 +592,30 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
         }
         /* Alignment of the IO window is always 4K */
         b_res->start = 4096;
-        b_res->end = b_res->start + size - 1;
+        b_res->end = b_res->start + size0 - 1;
         b_res->flags |= IORESOURCE_STARTALIGN;
+        if (size1 > size0 && add_head)
+                add_to_list(add_head, bus->self, b_res, size1-size0);
 }
 
-/* Calculate the size of the bus and minimal alignment which
-   guarantees that all child resources fit in this size. */
+/**
+ * pbus_size_mem() - size the memory window of a given bus
+ *
+ * @bus : the bus
+ * @min_size : the minimum memory window that must to be allocated
+ * @add_size : additional optional memory window
+ * @add_head : track the additional memory window on this list
+ *
+ * Calculate the size of the bus and minimal alignment which
+ * guarantees that all child resources fit in this size.
+ */
 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
-                         unsigned long type, resource_size_t min_size)
+                         unsigned long type, resource_size_t min_size,
+                        resource_size_t add_size,
+                        struct resource_list_x *add_head)
 {
         struct pci_dev *dev;
-        resource_size_t min_align, align, size;
+        resource_size_t min_align, align, size, size0, size1;
         resource_size_t aligns[12];     /* Alignments from 1Mb to 2Gb */
         int order, max_order;
         struct resource *b_res = find_free_bus_resource(bus, type);
@@ -557,8 +676,11 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
                         min_align = align1 >> 1;
                 align += aligns[order];
         }
-        size = calculate_memsize(size, min_size, 0, resource_size(b_res), align);
-        if (!size) {
+        size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), align);
+        size1 = !add_size ? size :
+                calculate_memsize(size, min_size+add_size, 0,
+                                resource_size(b_res), align);
+        if (!size0 && !size1) {
                 if (b_res->start || b_res->end)
                         dev_info(&bus->self->dev, "disabling bridge window "
                                  "%pR to [bus %02x-%02x] (unused)\n", b_res,
@@ -567,9 +689,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
                 return 1;
         }
         b_res->start = min_align;
-        b_res->end = size + min_align - 1;
-        b_res->flags |= IORESOURCE_STARTALIGN;
-        b_res->flags |= mem64_mask;
+        b_res->end = size0 + min_align - 1;
+        b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask;
+        if (size1 > size0 && add_head)
+                add_to_list(add_head, bus->self, b_res, size1-size0);
         return 1;
 }
 
@@ -622,11 +745,12 @@ static void pci_bus_size_cardbus(struct pci_bus *bus)
         }
 }
 
-void __ref pci_bus_size_bridges(struct pci_bus *bus)
+void __ref __pci_bus_size_bridges(struct pci_bus *bus,
+                        struct resource_list_x *add_head)
 {
         struct pci_dev *dev;
         unsigned long mask, prefmask;
-        resource_size_t min_mem_size = 0, min_io_size = 0;
+        resource_size_t additional_mem_size = 0, additional_io_size = 0;
 
         list_for_each_entry(dev, &bus->devices, bus_list) {
                 struct pci_bus *b = dev->subordinate;
@@ -640,7 +764,7 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
 
                 case PCI_CLASS_BRIDGE_PCI:
                 default:
-                        pci_bus_size_bridges(b);
+                        __pci_bus_size_bridges(b, add_head);
                         break;
                 }
         }
@@ -657,11 +781,14 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
         case PCI_CLASS_BRIDGE_PCI:
                 pci_bridge_check_ranges(bus);
                 if (bus->self->is_hotplug_bridge) {
-                        min_io_size  = pci_hotplug_io_size;
-                        min_mem_size = pci_hotplug_mem_size;
+                        additional_io_size  = pci_hotplug_io_size;
+                        additional_mem_size = pci_hotplug_mem_size;
                 }
+                /*
+                 * Follow thru
+                 */
         default:
-                pbus_size_io(bus, min_io_size);
+                pbus_size_io(bus, 0, additional_io_size, add_head);
                 /* If the bridge supports prefetchable range, size it
                    separately. If it doesn't, or its prefetchable window
                    has already been allocated by arch code, try
@@ -669,30 +796,36 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
                    resources. */
                 mask = IORESOURCE_MEM;
                 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
-                if (pbus_size_mem(bus, prefmask, prefmask, min_mem_size))
+                if (pbus_size_mem(bus, prefmask, prefmask, 0, additional_mem_size, add_head))
                         mask = prefmask; /* Success, size non-prefetch only. */
                 else
-                        min_mem_size += min_mem_size;
-                pbus_size_mem(bus, mask, IORESOURCE_MEM, min_mem_size);
+                        additional_mem_size += additional_mem_size;
+                pbus_size_mem(bus, mask, IORESOURCE_MEM, 0, additional_mem_size, add_head);
                 break;
         }
 }
+
+void __ref pci_bus_size_bridges(struct pci_bus *bus)
+{
+        __pci_bus_size_bridges(bus, NULL);
+}
 EXPORT_SYMBOL(pci_bus_size_bridges);
 
 static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
+                                         struct resource_list_x *add_head,
                                          struct resource_list_x *fail_head)
 {
         struct pci_bus *b;
         struct pci_dev *dev;
 
-        pbus_assign_resources_sorted(bus, fail_head);
+        pbus_assign_resources_sorted(bus, add_head, fail_head);
 
         list_for_each_entry(dev, &bus->devices, bus_list) {
                 b = dev->subordinate;
                 if (!b)
                         continue;
 
-                __pci_bus_assign_resources(b, fail_head);
+                __pci_bus_assign_resources(b, add_head, fail_head);
 
                 switch (dev->class >> 8) {
                 case PCI_CLASS_BRIDGE_PCI:
@@ -714,7 +847,7 @@ static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
 
 void __ref pci_bus_assign_resources(const struct pci_bus *bus)
 {
-        __pci_bus_assign_resources(bus, NULL);
+        __pci_bus_assign_resources(bus, NULL, NULL);
 }
 EXPORT_SYMBOL(pci_bus_assign_resources);
 
@@ -729,7 +862,7 @@ static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
         if (!b)
                 return;
 
-        __pci_bus_assign_resources(b, fail_head);
+        __pci_bus_assign_resources(b, NULL, fail_head);
 
         switch (bridge->class >> 8) {
         case PCI_CLASS_BRIDGE_PCI:
@@ -862,17 +995,21 @@ void __init
 pci_assign_unassigned_resources(void)
 {
         struct pci_bus *bus;
-
+        struct resource_list_x add_list; /* list of resources that
+                                        want additional resources */
+        add_list.next = NULL;
         /* Depth first, calculate sizes and alignments of all
            subordinate buses. */
         list_for_each_entry(bus, &pci_root_buses, node) {
-                pci_bus_size_bridges(bus);
+                __pci_bus_size_bridges(bus, &add_list);
         }
+
         /* Depth last, allocate resources and update the hardware. */
         list_for_each_entry(bus, &pci_root_buses, node) {
-                pci_bus_assign_resources(bus);
+                __pci_bus_assign_resources(bus, &add_list, NULL);
                 pci_enable_bridges(bus);
         }
+        BUG_ON(add_list.next);
 
         /* dump the resource on buses */
         list_for_each_entry(bus, &pci_root_buses, node) {