[PATCH] Calgary: check BBAR ioremap success when ioremapping

This patch cleans up the previous "Use BIOS supplied BBAR information"
patch. Mostly stylistic clenaups, but also check for ioremap failure
when we ioremap the BBAR rather than when trying to use it.

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Laurent Vivier <Laurent.Vivier@bull.net>

1 files changed, 49 insertions, 36 deletions

diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index afc0a53505f1..8a1e4f35bc3c 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -138,7 +138,7 @@ static int calgary_detected __read_mostly = 0;
 
 static struct rio_table_hdr     *rio_table_hdr __initdata;
 static struct scal_detail       *scal_devs[MAX_NUMNODES] __initdata;
-static struct rio_detail        *rio_devs[MAX_NUMNODES*4] __initdata;
+static struct rio_detail        *rio_devs[MAX_NUMNODES * 4] __initdata;
 
 struct calgary_bus_info {
         void *tce_space;
@@ -855,11 +855,6 @@ static void __init calgary_disable_translation(struct pci_dev *dev)
         del_timer_sync(&tbl->watchdog_timer);
 }
 
-static inline void __iomem * __init locate_register_space(struct pci_dev *dev)
-{
-        return busno_to_bbar(dev->bus->number);
-}
-
 static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
 {
         pci_dev_get(dev);
@@ -874,15 +869,10 @@ static int __init calgary_init_one(struct pci_dev *dev)
 
         BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM);
 
-        bbar = locate_register_space(dev);
-        if (!bbar) {
-                ret = -ENODATA;
-                goto done;
-        }
-
+        bbar = busno_to_bbar(dev->bus->number);
         ret = calgary_setup_tar(dev, bbar);
         if (ret)
-                goto iounmap;
+                goto done;
 
         pci_dev_get(dev);
         dev->bus->self = dev;
@@ -890,38 +880,39 @@ static int __init calgary_init_one(struct pci_dev *dev)
 
         return 0;
 
-iounmap:
-        iounmap(bbar);
 done:
         return ret;
 }
 
-static int __init calgary_init(void)
+static int __init calgary_locate_bbars(void)
 {
-        int ret = -ENODEV;
-        struct pci_dev *dev = NULL;
-        int rio, phb, bus;
+        int ret;
+        int rioidx, phb, bus;
         void __iomem *bbar;
         void __iomem *target;
+        unsigned long offset;
         u8 start_bus, end_bus;
         u32 val;
 
-        for (rio = 0; rio < rio_table_hdr->num_rio_dev; rio++) {
+        ret = -ENODATA;
+        for (rioidx = 0; rioidx < rio_table_hdr->num_rio_dev; rioidx++) {
+                struct rio_detail *rio = rio_devs[rioidx];
 
-                if ( (rio_devs[rio]->type != COMPAT_CALGARY) &&
-                     (rio_devs[rio]->type != ALT_CALGARY) )
+                if ((rio->type != COMPAT_CALGARY) && (rio->type != ALT_CALGARY))
                         continue;
 
                 /* map entire 1MB of Calgary config space */
-                bbar = ioremap_nocache(rio_devs[rio]->BBAR, 1024 * 1024);
+                bbar = ioremap_nocache(rio->BBAR, 1024 * 1024);
+                if (!bbar)
+                        goto error;
 
                 for (phb = 0; phb < PHBS_PER_CALGARY; phb++) {
+                        offset = phb_debug_offsets[phb] | PHB_DEBUG_STUFF_OFFSET;
+                        target = calgary_reg(bbar, offset);
 
-                        target = calgary_reg(bbar, phb_debug_offsets[phb] |
-                                                   PHB_DEBUG_STUFF_OFFSET);
                         val = be32_to_cpu(readl(target));
                         start_bus = (u8)((val & 0x00FF0000) >> 16);
-                        end_bus =   (u8)((val & 0x0000FF00) >> 8);
+                        end_bus = (u8)((val & 0x0000FF00) >> 8);
                         for (bus = start_bus; bus <= end_bus; bus++) {
                                 bus_info[bus].bbar = bbar;
                                 bus_info[bus].phbid = phb;
@@ -929,6 +920,25 @@ static int __init calgary_init(void)
                 }
         }
 
+        return 0;
+
+error:
+        /* scan bus_info and iounmap any bbars we previously ioremap'd */
+        for (bus = 0; bus < ARRAY_SIZE(bus_info); bus++)
+                if (bus_info[bus].bbar)
+                        iounmap(bus_info[bus].bbar);
+
+        return ret;
+}
+
+static int __init calgary_init(void)
+{
+        int ret;
+        struct pci_dev *dev = NULL;
+
+        ret = calgary_locate_bbars();
+        if (ret)
+                return ret;
 
         do {
                 dev = pci_get_device(PCI_VENDOR_ID_IBM,
@@ -1000,18 +1010,13 @@ static int __init build_detail_arrays(void)
 
         if (rio_table_hdr->num_scal_dev > MAX_NUMNODES){
                 printk(KERN_WARNING
-                        "Calgary: MAX_NUMNODES too low!  Defined as %d, "
+                        "Calgary: MAX_NUMNODES too low! Defined as %d, "
                         "but system has %d nodes.\n",
                         MAX_NUMNODES, rio_table_hdr->num_scal_dev);
                 return -ENODEV;
         }
 
         switch (rio_table_hdr->version){
-        default:
-                printk(KERN_WARNING
-                       "Calgary: Invalid Rio Grande Table Version: %d\n",
-                       rio_table_hdr->version);
-                return -ENODEV;
         case 2:
                 scal_detail_size = 11;
                 rio_detail_size = 13;
@@ -1020,6 +1025,11 @@ static int __init build_detail_arrays(void)
                 scal_detail_size = 12;
                 rio_detail_size = 15;
                 break;
+        default:
+                printk(KERN_WARNING
+                       "Calgary: Invalid Rio Grande Table Version: %d\n",
+                       rio_table_hdr->version);
+                return -EPROTO;
         }
 
         ptr = ((unsigned long)rio_table_hdr) + 3;
@@ -1042,6 +1052,7 @@ void __init detect_calgary(void)
         int calgary_found = 0;
         unsigned long ptr;
         int offset;
+        int ret;
 
         /*
          * if the user specified iommu=off or iommu=soft or we found
@@ -1061,27 +1072,29 @@ void __init detect_calgary(void)
                 /* The block id is stored in the 2nd word */
                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
                         /* set the pointer past the offset & block id */
-                        rio_table_hdr = (struct rio_table_hdr *)(ptr+offset+4);
+                        rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
                         break;
                 }
                 /* The next offset is stored in the 1st word. 0 means no more */
                 offset = *((unsigned short *)(ptr + offset));
         }
-        if (!rio_table_hdr){
+        if (!rio_table_hdr) {
                 printk(KERN_ERR "Calgary: Unable to locate "
                                 "Rio Grande Table in EBDA - bailing!\n");
                 return;
         }
 
-        if (build_detail_arrays())
+        ret = build_detail_arrays();
+        if (ret) {
+                printk(KERN_ERR "Calgary: build_detail_arrays ret %d\n", ret);
                 return;
+        }
 
         specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
 
         for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
                 int dev;
                 struct calgary_bus_info *info = &bus_info[bus];
-                info->phbid = -1;
 
                 if (read_pci_config(bus, 0, 0, 0) != PCI_VENDOR_DEVICE_ID_CALGARY)
                         continue;