cciss: Add cciss_allow_hpsa module parameter

Add cciss_allow_hpsa module parameter.  This parameter causes
the cciss driver to ignore any Smart Array devices known to be
supported by the hpsa driver.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 34 insertions, 40 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 52f53c134c5b..6399e5090df4 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -68,6 +68,12 @@ MODULE_SUPPORTED_DEVICE("HP SA5i SA5i+ SA532 SA5300 SA5312 SA641 SA642 SA6400"
 MODULE_VERSION("3.6.20");
 MODULE_LICENSE("GPL");
 
+static int cciss_allow_hpsa;
+module_param(cciss_allow_hpsa, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(cciss_allow_hpsa,
+        "Prevent cciss driver from accessing hardware known to be "
+        " supported by the hpsa driver");
+
 #include "cciss_cmd.h"
 #include "cciss.h"
 #include <linux/cciss_ioctl.h>
@@ -101,8 +107,6 @@ static const struct pci_device_id cciss_pci_device_id[] = {
         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3249},
         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324A},
         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324B},
-        {PCI_VENDOR_ID_HP,     PCI_ANY_ID,      PCI_ANY_ID, PCI_ANY_ID,
-                PCI_CLASS_STORAGE_RAID << 8, 0xffff << 8, 0},
         {0,}
 };
 
@@ -123,8 +127,6 @@ static struct board_type products[] = {
         {0x409D0E11, "Smart Array 6400 EM", &SA5_access},
         {0x40910E11, "Smart Array 6i", &SA5_access},
         {0x3225103C, "Smart Array P600", &SA5_access},
-        {0x3223103C, "Smart Array P800", &SA5_access},
-        {0x3234103C, "Smart Array P400", &SA5_access},
         {0x3235103C, "Smart Array P400i", &SA5_access},
         {0x3211103C, "Smart Array E200i", &SA5_access},
         {0x3212103C, "Smart Array E200", &SA5_access},
@@ -132,6 +134,10 @@ static struct board_type products[] = {
         {0x3214103C, "Smart Array E200i", &SA5_access},
         {0x3215103C, "Smart Array E200i", &SA5_access},
         {0x3237103C, "Smart Array E500", &SA5_access},
+/* controllers below this line are also supported by the hpsa driver. */
+#define HPSA_BOUNDARY 0x3223103C
+        {0x3223103C, "Smart Array P800", &SA5_access},
+        {0x3234103C, "Smart Array P400", &SA5_access},
         {0x323D103C, "Smart Array P700m", &SA5_access},
         {0x3241103C, "Smart Array P212", &SA5_access},
         {0x3243103C, "Smart Array P410", &SA5_access},
@@ -140,7 +146,6 @@ static struct board_type products[] = {
         {0x3249103C, "Smart Array P812", &SA5_access},
         {0x324A103C, "Smart Array P712m", &SA5_access},
         {0x324B103C, "Smart Array P711m", &SA5_access},
-        {0xFFFF103C, "Unknown Smart Array", &SA5_access},
 };
 
 /* How long to wait (in milliseconds) for board to go into simple mode */
@@ -3754,7 +3759,27 @@ static int __devinit cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
         __u64 cfg_offset;
         __u32 cfg_base_addr;
         __u64 cfg_base_addr_index;
-        int i, err;
+        int i, prod_index, err;
+
+        subsystem_vendor_id = pdev->subsystem_vendor;
+        subsystem_device_id = pdev->subsystem_device;
+        board_id = (((__u32) (subsystem_device_id << 16) & 0xffff0000) |
+                    subsystem_vendor_id);
+
+        for (i = 0; i < ARRAY_SIZE(products); i++) {
+                /* Stand aside for hpsa driver on request */
+                if (cciss_allow_hpsa && products[i].board_id == HPSA_BOUNDARY)
+                        return -ENODEV;
+                if (board_id == products[i].board_id)
+                        break;
+        }
+        prod_index = i;
+        if (prod_index == ARRAY_SIZE(products)) {
+                dev_warn(&pdev->dev,
+                        "unrecognized board ID: 0x%08lx, ignoring.\n",
+                        (unsigned long) board_id);
+                return -ENODEV;
+        }
 
         /* check to see if controller has been disabled */
         /* BEFORE trying to enable it */
@@ -3778,11 +3803,6 @@ static int __devinit cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
                 return err;
         }
 
-        subsystem_vendor_id = pdev->subsystem_vendor;
-        subsystem_device_id = pdev->subsystem_device;
-        board_id = (((__u32) (subsystem_device_id << 16) & 0xffff0000) |
-                    subsystem_vendor_id);
-
 #ifdef CCISS_DEBUG
         printk("command = %x\n", command);
         printk("irq = %x\n", pdev->irq);
@@ -3868,14 +3888,9 @@ static int __devinit cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
          * leave a little room for ioctl calls.
          */
         c->max_commands = readl(&(c->cfgtable->CmdsOutMax));
-        for (i = 0; i < ARRAY_SIZE(products); i++) {
-                if (board_id == products[i].board_id) {
-                        c->product_name = products[i].product_name;
-                        c->access = *(products[i].access);
-                        c->nr_cmds = c->max_commands - 4;
-                        break;
-                }
-        }
+        c->product_name = products[prod_index].product_name;
+        c->access = *(products[prod_index].access);
+        c->nr_cmds = c->max_commands - 4;
         if ((readb(&c->cfgtable->Signature[0]) != 'C') ||
             (readb(&c->cfgtable->Signature[1]) != 'I') ||
             (readb(&c->cfgtable->Signature[2]) != 'S') ||
@@ -3884,27 +3899,6 @@ static int __devinit cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
                 err = -ENODEV;
                 goto err_out_free_res;
         }
-        /* We didn't find the controller in our list. We know the
-         * signature is valid. If it's an HP device let's try to
-         * bind to the device and fire it up. Otherwise we bail.
-         */
-        if (i == ARRAY_SIZE(products)) {
-                if (subsystem_vendor_id == PCI_VENDOR_ID_HP) {
-                        c->product_name = products[i-1].product_name;
-                        c->access = *(products[i-1].access);
-                        c->nr_cmds = c->max_commands - 4;
-                        printk(KERN_WARNING "cciss: This is an unknown "
-                                "Smart Array controller.\n"
-                                "cciss: Please update to the latest driver "
-                                "available from www.hp.com.\n");
-                } else {
-                        printk(KERN_WARNING "cciss: Sorry, I don't know how"
-                                " to access the Smart Array controller %08lx\n"
-                                        , (unsigned long)board_id);
-                        err = -ENODEV;
-                        goto err_out_free_res;
-                }
-        }
 #ifdef CONFIG_X86
         {
                 /* Need to enable prefetch in the SCSI core for 6400 in x86 */