Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (34 commits)
  powerpc: Wireup new syscalls
  Move update_mmu_cache() declaration from tlbflush.h to pgtable.h
  powerpc/pseries: Remove kmalloc call in handling writes to lparcfg
  powerpc/pseries: Update arch vector to indicate support for CMO
  ibmvfc: Add support for collaborative memory overcommit
  ibmvscsi: driver enablement for CMO
  ibmveth: enable driver for CMO
  ibmveth: Automatically enable larger rx buffer pools for larger mtu
  powerpc/pseries: Verify CMO memory entitlement updates with virtual I/O
  powerpc/pseries: vio bus support for CMO
  powerpc/pseries: iommu enablement for CMO
  powerpc/pseries: Add CMO paging statistics
  powerpc/pseries: Add collaborative memory manager
  powerpc/pseries: Utilities to set firmware page state
  powerpc/pseries: Enable CMO feature during platform setup
  powerpc/pseries: Split retrieval of processor entitlement data into a helper routine
  powerpc/pseries: Add memory entitlement capabilities to /proc/ppc64/lparcfg
  powerpc/pseries: Split processor entitlement retrieval and gathering to helper routines
  powerpc/pseries: Remove extraneous error reporting for hcall failures in lparcfg
  powerpc: Fix compile error with binutils 2.15
  ...

Fixed up conflict in arch/powerpc/platforms/52xx/Kconfig manually.

6 files changed, 208 insertions, 50 deletions

diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index 00527805e4f1..e5a6e2e84540 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -33,6 +33,7 @@
 */
 
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/ioport.h>
@@ -52,7 +53,9 @@
 #include <asm/hvcall.h>
 #include <asm/atomic.h>
 #include <asm/vio.h>
+#include <asm/iommu.h>
 #include <asm/uaccess.h>
+#include <asm/firmware.h>
 #include <linux/seq_file.h>
 
 #include "ibmveth.h"
@@ -94,8 +97,10 @@ static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
+static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
 static struct kobj_type ktype_veth_pool;
 
+
 #ifdef CONFIG_PROC_FS
 #define IBMVETH_PROC_DIR "ibmveth"
 static struct proc_dir_entry *ibmveth_proc_dir;
@@ -226,16 +231,16 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
         u32 i;
         u32 count = pool->size - atomic_read(&pool->available);
         u32 buffers_added = 0;
+        struct sk_buff *skb;
+        unsigned int free_index, index;
+        u64 correlator;
+        unsigned long lpar_rc;
+        dma_addr_t dma_addr;
 
         mb();
 
         for(i = 0; i < count; ++i) {
-                struct sk_buff *skb;
-                unsigned int free_index, index;
-                u64 correlator;
                 union ibmveth_buf_desc desc;
-                unsigned long lpar_rc;
-                dma_addr_t dma_addr;
 
                 skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
 
@@ -255,6 +260,9 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
                                 pool->buff_size, DMA_FROM_DEVICE);
 
+                if (dma_mapping_error(dma_addr))
+                        goto failure;
+
                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
                 pool->dma_addr[index] = dma_addr;
                 pool->skbuff[index] = skb;
@@ -267,20 +275,9 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
 
                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 
-                if(lpar_rc != H_SUCCESS) {
-                        pool->free_map[free_index] = index;
-                        pool->skbuff[index] = NULL;
-                        if (pool->consumer_index == 0)
-                                pool->consumer_index = pool->size - 1;
-                        else
-                                pool->consumer_index--;
-                        dma_unmap_single(&adapter->vdev->dev,
-                                        pool->dma_addr[index], pool->buff_size,
-                                        DMA_FROM_DEVICE);
-                        dev_kfree_skb_any(skb);
-                        adapter->replenish_add_buff_failure++;
-                        break;
-                } else {
+                if (lpar_rc != H_SUCCESS)
+                        goto failure;
+                else {
                         buffers_added++;
                         adapter->replenish_add_buff_success++;
                 }
@@ -288,6 +285,24 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
 
         mb();
         atomic_add(buffers_added, &(pool->available));
+        return;
+
+failure:
+        pool->free_map[free_index] = index;
+        pool->skbuff[index] = NULL;
+        if (pool->consumer_index == 0)
+                pool->consumer_index = pool->size - 1;
+        else
+                pool->consumer_index--;
+        if (!dma_mapping_error(dma_addr))
+                dma_unmap_single(&adapter->vdev->dev,
+                                 pool->dma_addr[index], pool->buff_size,
+                                 DMA_FROM_DEVICE);
+        dev_kfree_skb_any(skb);
+        adapter->replenish_add_buff_failure++;
+
+        mb();
+        atomic_add(buffers_added, &(pool->available));
 }
 
 /* replenish routine */
@@ -297,7 +312,7 @@ static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 
         adapter->replenish_task_cycles++;
 
-        for(i = 0; i < IbmVethNumBufferPools; i++)
+        for (i = (IbmVethNumBufferPools - 1); i >= 0; i--)
                 if(adapter->rx_buff_pool[i].active)
                         ibmveth_replenish_buffer_pool(adapter,
                                                      &adapter->rx_buff_pool[i]);
@@ -472,6 +487,18 @@ static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
                 if (adapter->rx_buff_pool[i].active)
                         ibmveth_free_buffer_pool(adapter,
                                                  &adapter->rx_buff_pool[i]);
+
+        if (adapter->bounce_buffer != NULL) {
+                if (!dma_mapping_error(adapter->bounce_buffer_dma)) {
+                        dma_unmap_single(&adapter->vdev->dev,
+                                        adapter->bounce_buffer_dma,
+                                        adapter->netdev->mtu + IBMVETH_BUFF_OH,
+                                        DMA_BIDIRECTIONAL);
+                        adapter->bounce_buffer_dma = DMA_ERROR_CODE;
+                }
+                kfree(adapter->bounce_buffer);
+                adapter->bounce_buffer = NULL;
+        }
 }
 
 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
@@ -607,6 +634,24 @@ static int ibmveth_open(struct net_device *netdev)
                 return rc;
         }
 
+        adapter->bounce_buffer =
+            kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
+        if (!adapter->bounce_buffer) {
+                ibmveth_error_printk("unable to allocate bounce buffer\n");
+                ibmveth_cleanup(adapter);
+                napi_disable(&adapter->napi);
+                return -ENOMEM;
+        }
+        adapter->bounce_buffer_dma =
+            dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
+                           netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
+        if (dma_mapping_error(adapter->bounce_buffer_dma)) {
+                ibmveth_error_printk("unable to map bounce buffer\n");
+                ibmveth_cleanup(adapter);
+                napi_disable(&adapter->napi);
+                return -ENOMEM;
+        }
+
         ibmveth_debug_printk("initial replenish cycle\n");
         ibmveth_interrupt(netdev->irq, netdev);
 
@@ -853,10 +898,12 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
         unsigned int tx_packets = 0;
         unsigned int tx_send_failed = 0;
         unsigned int tx_map_failed = 0;
+        int used_bounce = 0;
+        unsigned long data_dma_addr;
 
         desc.fields.flags_len = IBMVETH_BUF_VALID | skb->len;
-        desc.fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
-                                             skb->len, DMA_TO_DEVICE);
+        data_dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
+                                       skb->len, DMA_TO_DEVICE);
 
         if (skb->ip_summed == CHECKSUM_PARTIAL &&
             ip_hdr(skb)->protocol != IPPROTO_TCP && skb_checksum_help(skb)) {
@@ -875,12 +922,16 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
                 buf[1] = 0;
         }
 
-        if (dma_mapping_error(desc.fields.address)) {
-                ibmveth_error_printk("tx: unable to map xmit buffer\n");
+        if (dma_mapping_error(data_dma_addr)) {
+                if (!firmware_has_feature(FW_FEATURE_CMO))
+                        ibmveth_error_printk("tx: unable to map xmit buffer\n");
+                skb_copy_from_linear_data(skb, adapter->bounce_buffer,
+                                          skb->len);
+                desc.fields.address = adapter->bounce_buffer_dma;
                 tx_map_failed++;
-                tx_dropped++;
-                goto out;
-        }
+                used_bounce = 1;
+        } else
+                desc.fields.address = data_dma_addr;
 
         /* send the frame. Arbitrarily set retrycount to 1024 */
         correlator = 0;
@@ -904,8 +955,9 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
                 netdev->trans_start = jiffies;
         }
 
-        dma_unmap_single(&adapter->vdev->dev, desc.fields.address,
-                         skb->len, DMA_TO_DEVICE);
+        if (!used_bounce)
+                dma_unmap_single(&adapter->vdev->dev, data_dma_addr,
+                                 skb->len, DMA_TO_DEVICE);
 
 out:    spin_lock_irqsave(&adapter->stats_lock, flags);
         netdev->stats.tx_dropped += tx_dropped;
@@ -1053,9 +1105,9 @@ static void ibmveth_set_multicast_list(struct net_device *netdev)
 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
 {
         struct ibmveth_adapter *adapter = dev->priv;
+        struct vio_dev *viodev = adapter->vdev;
         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
-        int reinit = 0;
-        int i, rc;
+        int i;
 
         if (new_mtu < IBMVETH_MAX_MTU)
                 return -EINVAL;
@@ -1067,23 +1119,34 @@ static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
         if (i == IbmVethNumBufferPools)
                 return -EINVAL;
 
+        /* Deactivate all the buffer pools so that the next loop can activate
+           only the buffer pools necessary to hold the new MTU */
+        for (i = 0; i < IbmVethNumBufferPools; i++)
+                if (adapter->rx_buff_pool[i].active) {
+                        ibmveth_free_buffer_pool(adapter,
+                                                 &adapter->rx_buff_pool[i]);
+                        adapter->rx_buff_pool[i].active = 0;
+                }
+
         /* Look for an active buffer pool that can hold the new MTU */
         for(i = 0; i<IbmVethNumBufferPools; i++) {
-                if (!adapter->rx_buff_pool[i].active) {
-                        adapter->rx_buff_pool[i].active = 1;
-                        reinit = 1;
-                }
+                adapter->rx_buff_pool[i].active = 1;
 
                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
-                        if (reinit && netif_running(adapter->netdev)) {
+                        if (netif_running(adapter->netdev)) {
                                 adapter->pool_config = 1;
                                 ibmveth_close(adapter->netdev);
                                 adapter->pool_config = 0;
                                 dev->mtu = new_mtu;
-                                if ((rc = ibmveth_open(adapter->netdev)))
-                                        return rc;
-                        } else
-                                dev->mtu = new_mtu;
+                                vio_cmo_set_dev_desired(viodev,
+                                                ibmveth_get_desired_dma
+                                                (viodev));
+                                return ibmveth_open(adapter->netdev);
+                        }
+                        dev->mtu = new_mtu;
+                        vio_cmo_set_dev_desired(viodev,
+                                                ibmveth_get_desired_dma
+                                                (viodev));
                         return 0;
                 }
         }
@@ -1098,6 +1161,46 @@ static void ibmveth_poll_controller(struct net_device *dev)
 }
 #endif
 
+/**
+ * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
+ *
+ * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
+ *
+ * Return value:
+ *      Number of bytes of IO data the driver will need to perform well.
+ */
+static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
+{
+        struct net_device *netdev = dev_get_drvdata(&vdev->dev);
+        struct ibmveth_adapter *adapter;
+        unsigned long ret;
+        int i;
+        int rxqentries = 1;
+
+        /* netdev inits at probe time along with the structures we need below*/
+        if (netdev == NULL)
+                return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
+
+        adapter = netdev_priv(netdev);
+
+        ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
+        ret += IOMMU_PAGE_ALIGN(netdev->mtu);
+
+        for (i = 0; i < IbmVethNumBufferPools; i++) {
+                /* add the size of the active receive buffers */
+                if (adapter->rx_buff_pool[i].active)
+                        ret +=
+                            adapter->rx_buff_pool[i].size *
+                            IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
+                                    buff_size);
+                rxqentries += adapter->rx_buff_pool[i].size;
+        }
+        /* add the size of the receive queue entries */
+        ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
+
+        return ret;
+}
+
 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
 {
         int rc, i;
@@ -1242,6 +1345,8 @@ static int __devexit ibmveth_remove(struct vio_dev *dev)
         ibmveth_proc_unregister_adapter(adapter);
 
         free_netdev(netdev);
+        dev_set_drvdata(&dev->dev, NULL);
+
         return 0;
 }
 
@@ -1402,14 +1507,15 @@ const char * buf, size_t count)
                                 return -EPERM;
                         }
 
-                        pool->active = 0;
                         if (netif_running(netdev)) {
                                 adapter->pool_config = 1;
                                 ibmveth_close(netdev);
+                                pool->active = 0;
                                 adapter->pool_config = 0;
                                 if ((rc = ibmveth_open(netdev)))
                                         return rc;
                         }
+                        pool->active = 0;
                 }
         } else if (attr == &veth_num_attr) {
                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)
@@ -1485,6 +1591,7 @@ static struct vio_driver ibmveth_driver = {
         .id_table       = ibmveth_device_table,
         .probe          = ibmveth_probe,
         .remove         = ibmveth_remove,
+        .get_desired_dma = ibmveth_get_desired_dma,
         .driver         = {
                 .name   = ibmveth_driver_name,
                 .owner  = THIS_MODULE,
diff --git a/drivers/net/ibmveth.h b/drivers/net/ibmveth.h
index 41f61cd18852..d28186948752 100644
--- a/drivers/net/ibmveth.h
+++ b/drivers/net/ibmveth.h
@@ -93,9 +93,12 @@ static inline long h_illan_attributes(unsigned long unit_address,
   plpar_hcall_norets(H_CHANGE_LOGICAL_LAN_MAC, ua, mac)
 
 #define IbmVethNumBufferPools 5
+#define IBMVETH_IO_ENTITLEMENT_DEFAULT 4243456 /* MTU of 1500 needs 4.2Mb */
 #define IBMVETH_BUFF_OH 22 /* Overhead: 14 ethernet header + 8 opaque handle */
 #define IBMVETH_MAX_MTU 68
 #define IBMVETH_MAX_POOL_COUNT 4096
+#define IBMVETH_BUFF_LIST_SIZE 4096
+#define IBMVETH_FILT_LIST_SIZE 4096
 #define IBMVETH_MAX_BUF_SIZE (1024 * 128)
 
 static int pool_size[] = { 512, 1024 * 2, 1024 * 16, 1024 * 32, 1024 * 64 };
@@ -143,6 +146,8 @@ struct ibmveth_adapter {
     struct ibmveth_rx_q rx_queue;
     int pool_config;
     int rx_csum;
+    void *bounce_buffer;
+    dma_addr_t bounce_buffer_dma;
 
     /* adapter specific stats */
     u64 replenish_task_cycles;
diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c
index 5c015d310d4a..344e1b03dd8b 100644
--- a/drivers/of/of_i2c.c
+++ b/drivers/of/of_i2c.c
@@ -91,8 +91,6 @@ void of_register_i2c_devices(struct i2c_adapter *adap,
                 }
 
                 info.irq = irq_of_parse_and_map(node, 0);
-                if (info.irq == NO_IRQ)
-                        info.irq = -1;
 
                 if (of_find_i2c_driver(node, &info) < 0) {
                         irq_dispose_mapping(info.irq);
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index eb702b96d57c..c4a7c06793c5 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -3819,6 +3819,20 @@ static int ibmvfc_remove(struct vio_dev *vdev)
         return 0;
 }
 
+/**
+ * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
+ * @vdev:       vio device struct
+ *
+ * Return value:
+ *      Number of bytes the driver will need to DMA map at the same time in
+ *      order to perform well.
+ */
+static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
+{
+        unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
+        return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
+}
+
 static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
         {"fcp", "IBM,vfc-client"},
         { "", "" }
@@ -3829,6 +3843,7 @@ static struct vio_driver ibmvfc_driver = {
         .id_table = ibmvfc_device_table,
         .probe = ibmvfc_probe,
         .remove = ibmvfc_remove,
+        .get_desired_dma = ibmvfc_get_desired_dma,
         .driver = {
                 .name = IBMVFC_NAME,
                 .owner = THIS_MODULE,
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 5d23368a1bce..20000ec79b04 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -72,6 +72,7 @@
 #include <linux/delay.h>
 #include <asm/firmware.h>
 #include <asm/vio.h>
+#include <asm/firmware.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_host.h>
@@ -426,8 +427,10 @@ static int map_sg_data(struct scsi_cmnd *cmd,
                                            SG_ALL * sizeof(struct srp_direct_buf),
                                            &evt_struct->ext_list_token, 0);
                 if (!evt_struct->ext_list) {
-                        sdev_printk(KERN_ERR, cmd->device,
-                                    "Can't allocate memory for indirect table\n");
+                        if (!firmware_has_feature(FW_FEATURE_CMO))
+                                sdev_printk(KERN_ERR, cmd->device,
+                                            "Can't allocate memory "
+                                            "for indirect table\n");
                         return 0;
                 }
         }
@@ -743,7 +746,9 @@ static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
         srp_cmd->lun = ((u64) lun) << 48;
 
         if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
-                sdev_printk(KERN_ERR, cmnd->device, "couldn't convert cmd to srp_cmd\n");
+                if (!firmware_has_feature(FW_FEATURE_CMO))
+                        sdev_printk(KERN_ERR, cmnd->device,
+                                    "couldn't convert cmd to srp_cmd\n");
                 free_event_struct(&hostdata->pool, evt_struct);
                 return SCSI_MLQUEUE_HOST_BUSY;
         }
@@ -855,7 +860,10 @@ static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
                                             DMA_BIDIRECTIONAL);
 
         if (dma_mapping_error(req->buffer)) {
-                dev_err(hostdata->dev, "Unable to map request_buffer for adapter_info!\n");
+                if (!firmware_has_feature(FW_FEATURE_CMO))
+                        dev_err(hostdata->dev,
+                                "Unable to map request_buffer for "
+                                "adapter_info!\n");
                 free_event_struct(&hostdata->pool, evt_struct);
                 return;
         }
@@ -1400,7 +1408,9 @@ static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
                                                     DMA_BIDIRECTIONAL);
 
         if (dma_mapping_error(host_config->buffer)) {
-                dev_err(hostdata->dev, "dma_mapping error getting host config\n");
+                if (!firmware_has_feature(FW_FEATURE_CMO))
+                        dev_err(hostdata->dev,
+                                "dma_mapping error getting host config\n");
                 free_event_struct(&hostdata->pool, evt_struct);
                 return -1;
         }
@@ -1604,7 +1614,7 @@ static struct scsi_host_template driver_template = {
         .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
         .slave_configure = ibmvscsi_slave_configure,
         .change_queue_depth = ibmvscsi_change_queue_depth,
-        .cmd_per_lun = 16,
+        .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
         .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
         .this_id = -1,
         .sg_tablesize = SG_ALL,
@@ -1613,6 +1623,26 @@ static struct scsi_host_template driver_template = {
 };
 
 /**
+ * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
+ *
+ * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
+ *
+ * Return value:
+ *      Number of bytes of IO data the driver will need to perform well.
+ */
+static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
+{
+        /* iu_storage data allocated in initialize_event_pool */
+        unsigned long desired_io = max_requests * sizeof(union viosrp_iu);
+
+        /* add io space for sg data */
+        desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT *
+                             IBMVSCSI_CMDS_PER_LUN_DEFAULT);
+
+        return desired_io;
+}
+
+/**
  * Called by bus code for each adapter
  */
 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
@@ -1641,7 +1671,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
         hostdata->host = host;
         hostdata->dev = dev;
         atomic_set(&hostdata->request_limit, -1);
-        hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
+        hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
 
         rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_requests);
         if (rc != 0 && rc != H_RESOURCE) {
@@ -1735,6 +1765,7 @@ static struct vio_driver ibmvscsi_driver = {
         .id_table = ibmvscsi_device_table,
         .probe = ibmvscsi_probe,
         .remove = ibmvscsi_remove,
+        .get_desired_dma = ibmvscsi_get_desired_dma,
         .driver = {
                 .name = "ibmvscsi",
                 .owner = THIS_MODULE,
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h
index 46e850e302c7..2d4339d5e16e 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.h
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.h
@@ -45,6 +45,8 @@ struct Scsi_Host;
 #define MAX_INDIRECT_BUFS 10
 
 #define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
+#define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16
+#define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */
 #define IBMVSCSI_MAX_CMDS_PER_LUN 64
 
 /* ------------------------------------------------------------