scsi: megaraid_sas: reduce size of fusion_context and use vmalloc if kmalloc fails

Currently fusion context has fixed array load_balance_info. Use dynamic
allocation.  In few places, driver do not want physically contigious
memory.  Attempt to use vmalloc if physical contiguous memory is not
available.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 93da6dc..0a20fff 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -2488,4 +2488,6 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int reason);
 int megasas_task_abort_fusion(struct scsi_cmnd *scmd);
 int megasas_reset_target_fusion(struct scsi_cmnd *scmd);
 u32 mega_mod64(u64 dividend, u32 divisor);
+int megasas_alloc_fusion_context(struct megasas_instance *instance);
+void megasas_free_fusion_context(struct megasas_instance *instance);
 #endif                         /*LSI_MEGARAID_SAS_H */

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index c8fa480..b2da257 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -6029,18 +6029,12 @@ static int megasas_probe_one(struct pci_dev *pdev,
        case PCI_DEVICE_ID_LSI_CUTLASS_52:
        case PCI_DEVICE_ID_LSI_CUTLASS_53:
        {
-               instance->ctrl_context_pages =
-                       get_order(sizeof(struct fusion_context));
-               instance->ctrl_context = (void *)__get_free_pages(GFP_KERNEL,
-                               instance->ctrl_context_pages);
-               if (!instance->ctrl_context) {
-                       dev_printk(KERN_DEBUG, &pdev->dev, "Failed to allocate "
-                              "memory for Fusion context info\n");
+               if (megasas_alloc_fusion_context(instance)) {
+                       megasas_free_fusion_context(instance);
                        goto fail_alloc_dma_buf;
                }
                fusion = instance->ctrl_context;
-               memset(fusion, 0,
-                       ((1 << PAGE_SHIFT) << instance->ctrl_context_pages));
+
                if ((instance->pdev->device == PCI_DEVICE_ID_LSI_FUSION) ||
                        (instance->pdev->device == PCI_DEVICE_ID_LSI_PLASMA))
                        fusion->adapter_type = THUNDERBOLT_SERIES;
@@ -6683,8 +6677,7 @@ skip_firing_dcmds:
                                        fusion->pd_seq_sync[i],
                                        fusion->pd_seq_phys[i]);
                }
-               free_pages((ulong)instance->ctrl_context,
-                       instance->ctrl_context_pages);
+               megasas_free_fusion_context(instance);
        } else {
                megasas_release_mfi(instance);
                pci_free_consistent(pdev, sizeof(u32),

diff --git a/drivers/scsi/megaraid/megaraid_sas_fp.c b/drivers/scsi/megaraid/megaraid_sas_fp.c
index c3ef82d..d9b0f28 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_fp.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fp.c
@@ -489,7 +489,8 @@ u8 MR_ValidateMapInfo(struct megasas_instance *instance)
        if (instance->UnevenSpanSupport)
                mr_update_span_set(drv_map, ldSpanInfo);
 
-       mr_update_load_balance_params(drv_map, lbInfo);
+       if (lbInfo)
+               mr_update_load_balance_params(drv_map, lbInfo);
 
        num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 1252a3c..9019b82 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -47,6 +47,7 @@
 #include <linux/blkdev.h>
 #include <linux/mutex.h>
 #include <linux/poll.h>
+#include <linux/vmalloc.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -2397,8 +2398,9 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
                        io_request->IoFlags |=
                        cpu_to_le16(MPI25_SAS_DEVICE0_FLAGS_ENABLED_FAST_PATH);
                }
-               if ((fusion->load_balance_info[device_id].loadBalanceFlag) &&
-                   (io_info.isRead)) {
+               if (fusion->load_balance_info &&
+                       (fusion->load_balance_info[device_id].loadBalanceFlag) &&
+                       (io_info.isRead)) {
                        io_info.devHandle =
                                get_updated_dev_handle(instance,
                                        &fusion->load_balance_info[device_id],
@@ -4270,9 +4272,10 @@ transition_to_ready:
                                retval = FAILED;
                        }
                        /* Reset load balance info */
-                       memset(fusion->load_balance_info, 0,
-                              sizeof(struct LD_LOAD_BALANCE_INFO)
-                              *MAX_LOGICAL_DRIVES_EXT);
+                       if (fusion->load_balance_info)
+                               memset(fusion->load_balance_info, 0,
+                                      (sizeof(struct LD_LOAD_BALANCE_INFO) *
+                                      MAX_LOGICAL_DRIVES_EXT));
 
                        if (!megasas_get_map_info(instance))
                                megasas_sync_map_info(instance);
@@ -4426,6 +4429,64 @@ void megasas_fusion_ocr_wq(struct work_struct *work)
        megasas_reset_fusion(instance->host, 0);
 }
 
+/* Allocate fusion context */
+int
+megasas_alloc_fusion_context(struct megasas_instance *instance)
+{
+       struct fusion_context *fusion;
+
+       instance->ctrl_context_pages = get_order(sizeof(struct fusion_context));
+       instance->ctrl_context = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+               instance->ctrl_context_pages);
+       if (!instance->ctrl_context) {
+               /* fall back to using vmalloc for fusion_context */
+               instance->ctrl_context = vzalloc(sizeof(struct fusion_context));
+               if (!instance->ctrl_context) {
+                       dev_err(&instance->pdev->dev, "Failed from %s %d\n", __func__, __LINE__);
+                       return -ENOMEM;
+               }
+       }
+
+       fusion = instance->ctrl_context;
+
+       fusion->load_balance_info_pages = get_order(MAX_LOGICAL_DRIVES_EXT *
+               sizeof(struct LD_LOAD_BALANCE_INFO));
+       fusion->load_balance_info =
+               (struct LD_LOAD_BALANCE_INFO *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+               fusion->load_balance_info_pages);
+       if (!fusion->load_balance_info) {
+               fusion->load_balance_info = vzalloc(MAX_LOGICAL_DRIVES_EXT *
+                       sizeof(struct LD_LOAD_BALANCE_INFO));
+               if (!fusion->load_balance_info)
+                       dev_err(&instance->pdev->dev, "Failed to allocate load_balance_info, "
+                               "continuing without Load Balance support\n");
+       }
+
+       return 0;
+}
+
+void
+megasas_free_fusion_context(struct megasas_instance *instance)
+{
+       struct fusion_context *fusion = instance->ctrl_context;
+
+       if (fusion) {
+               if (fusion->load_balance_info) {
+                       if (is_vmalloc_addr(fusion->load_balance_info))
+                               vfree(fusion->load_balance_info);
+                       else
+                               free_pages((ulong)fusion->load_balance_info,
+                                       fusion->load_balance_info_pages);
+               }
+
+               if (is_vmalloc_addr(fusion))
+                       vfree(fusion);
+               else
+                       free_pages((ulong)fusion,
+                               instance->ctrl_context_pages);
+       }
+}
+
 struct megasas_instance_template megasas_instance_template_fusion = {
        .enable_intr = megasas_enable_intr_fusion,
        .disable_intr = megasas_disable_intr_fusion,

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index c606ca0..f25a262 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
@@ -1287,7 +1287,8 @@ struct fusion_context {
        struct MR_PD_CFG_SEQ_NUM_SYNC   *pd_seq_sync[JBOD_MAPS_COUNT];
        dma_addr_t pd_seq_phys[JBOD_MAPS_COUNT];
        u8 fast_path_io;
-       struct LD_LOAD_BALANCE_INFO load_balance_info[MAX_LOGICAL_DRIVES_EXT];
+       struct LD_LOAD_BALANCE_INFO *load_balance_info;
+       u32 load_balance_info_pages;
        LD_SPAN_INFO log_to_span[MAX_LOGICAL_DRIVES_EXT];
        u8 adapter_type;
        struct LD_STREAM_DETECT **stream_detect_by_ld;