[PATCH] yenta: allocate resource fixes

The current CardBus window allocation code in yenta_socket is unable to handle
the transparent PCI-bridge handling update in 2.6.13.  We need to check _all_
resources of a given type to find the best one suitable for CardBus windows,
not just the first one.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 88 insertions, 38 deletions

diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index d3807e22fe0..f9d2367b6bd 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -527,24 +527,87 @@ static int yenta_sock_suspend(struct pcmcia_socket *sock)
  * Use an adaptive allocation for the memory resource,
  * sometimes the memory behind pci bridges is limited:
  * 1/8 of the size of the io window of the parent.
- * max 4 MB, min 16 kB.
+ * max 4 MB, min 16 kB. We try very hard to not get below
+ * the "ACC" values, though.
  */
 #define BRIDGE_MEM_MAX 4*1024*1024
+#define BRIDGE_MEM_ACC 128*1024
 #define BRIDGE_MEM_MIN 16*1024
 
-#define BRIDGE_IO_MAX 256
+#define BRIDGE_IO_MAX 512
+#define BRIDGE_IO_ACC 256
 #define BRIDGE_IO_MIN 32
 
 #ifndef PCIBIOS_MIN_CARDBUS_IO
 #define PCIBIOS_MIN_CARDBUS_IO PCIBIOS_MIN_IO
 #endif
 
+static int yenta_search_one_res(struct resource *root, struct resource *res,
+                                u32 min)
+{
+        u32 align, size, start, end;
+
+        if (res->flags & IORESOURCE_IO) {
+                align = 1024;
+                size = BRIDGE_IO_MAX;
+                start = PCIBIOS_MIN_CARDBUS_IO;
+                end = ~0U;
+        } else {
+                unsigned long avail = root->end - root->start;
+                int i;
+                size = BRIDGE_MEM_MAX;
+                if (size > avail/8) {
+                        size=(avail+1)/8;
+                        /* round size down to next power of 2 */
+                        i = 0;
+                        while ((size /= 2) != 0)
+                                i++;
+                        size = 1 << i;
+                }
+                if (size < min)
+                        size = min;
+                align = size;
+                start = PCIBIOS_MIN_MEM;
+                end = ~0U;
+        }
+
+        do {
+                if (allocate_resource(root, res, size, start, end, align,
+                                      NULL, NULL)==0) {
+                        return 1;
+                }
+                size = size/2;
+                align = size;
+        } while (size >= min);
+
+        return 0;
+}
+
+
+static int yenta_search_res(struct yenta_socket *socket, struct resource *res,
+                            u32 min)
+{
+        int i;
+        for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
+                struct resource * root = socket->dev->bus->resource[i];
+                if (!root)
+                        continue;
+
+                if ((res->flags ^ root->flags) &
+                    (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH))
+                        continue; /* Wrong type */
+
+                if (yenta_search_one_res(root, res, min))
+                        return 1;
+        }
+        return 0;
+}
+
 static void yenta_allocate_res(struct yenta_socket *socket, int nr, unsigned type, int addr_start, int addr_end)
 {
         struct pci_bus *bus;
         struct resource *root, *res;
         u32 start, end;
-        u32 align, size, min;
         unsigned mask;
 
         res = socket->dev->resource + PCI_BRIDGE_RESOURCES + nr;
@@ -573,48 +636,35 @@ static void yenta_allocate_res(struct yenta_socket *socket, int nr, unsigned typ
                                 pci_name(socket->dev), nr);
         }
 
-        res->start = 0;
-        res->end = 0;
-        root = pci_find_parent_resource(socket->dev, res);
-
         if (type & IORESOURCE_IO) {
-                align = 1024;
-                size = BRIDGE_IO_MAX;
-                min = BRIDGE_IO_MIN;
-                start = PCIBIOS_MIN_CARDBUS_IO;
-                end = ~0U;
+                if ((yenta_search_res(socket, res, BRIDGE_IO_MAX)) ||
+                    (yenta_search_res(socket, res, BRIDGE_IO_ACC)) ||
+                    (yenta_search_res(socket, res, BRIDGE_IO_MIN))) {
+                        config_writel(socket, addr_start, res->start);
+                        config_writel(socket, addr_end, res->end);
+                }
         } else {
-                unsigned long avail = root->end - root->start;
-                int i;
-                size = BRIDGE_MEM_MAX;
-                if (size > avail/8) {
-                        size=(avail+1)/8;
-                        /* round size down to next power of 2 */
-                        i = 0;
-                        while ((size /= 2) != 0)
-                                i++;
-                        size = 1 << i;
+                if (type & IORESOURCE_PREFETCH) {
+                        if ((yenta_search_res(socket, res, BRIDGE_MEM_MAX)) ||
+                            (yenta_search_res(socket, res, BRIDGE_MEM_ACC)) ||
+                            (yenta_search_res(socket, res, BRIDGE_MEM_MIN))) {
+                                config_writel(socket, addr_start, res->start);
+                                config_writel(socket, addr_end, res->end);
+                        }
+                        /* Approximating prefetchable by non-prefetchable */
+                        res->flags = IORESOURCE_MEM;
                 }
-                if (size < BRIDGE_MEM_MIN)
-                        size = BRIDGE_MEM_MIN;
-                min = BRIDGE_MEM_MIN;
-                align = size;
-                start = PCIBIOS_MIN_MEM;
-                end = ~0U;
-        }
-        
-        do {
-                if (allocate_resource(root, res, size, start, end, align, NULL, NULL)==0) {
+                if ((yenta_search_res(socket, res, BRIDGE_MEM_MAX)) ||
+                    (yenta_search_res(socket, res, BRIDGE_MEM_ACC)) ||
+                    (yenta_search_res(socket, res, BRIDGE_MEM_MIN))) {
                         config_writel(socket, addr_start, res->start);
                         config_writel(socket, addr_end, res->end);
-                        return;
                 }
-                size = size/2;
-                align = size;
-        } while (size >= min);
+        }
+
         printk(KERN_INFO "yenta %s: no resource of type %x available, trying to continue...\n",
-                        pci_name(socket->dev), type);
-        res->start = res->end = 0;
+               pci_name(socket->dev), type);
+        res->start = res->end = res->flags = 0;
 }
 
 /*