[SCSI] mvsas: add support for Task collector mode and fixed relative bugs

1. Add support for Task collector mode.
2. Fixed relative collector mode bug:
   - I/O failed when disks is on two ports
   - system hang when hotplug disk
   - system hang when unplug disk during run IO
3. Unlock ap->lock within .lldd_execute_task for direct mode to
   improve performance
Signed-off-by: Xiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/mvsas/Kconfig

@@ -3,6 +3,7 @@
 #
 # Copyright 2007 Red Hat, Inc.
 # Copyright 2008 Marvell. <kewei@marvell.com>
+# Copyright 2009-20011 Marvell. <yuxiangl@marvell.com>
 #
 # This file is licensed under GPLv2.
 #

drivers/scsi/mvsas/Makefile

@@ -3,6 +3,7 @@
 #
 # Copyright 2007 Red Hat, Inc.
 # Copyright 2008 Marvell. <kewei@marvell.com>
+# Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
 #
 # This file is licensed under GPLv2.
 #

drivers/scsi/mvsas/mv_64xx.c

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *

drivers/scsi/mvsas/mv_64xx.h

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *

drivers/scsi/mvsas/mv_94xx.c

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *

drivers/scsi/mvsas/mv_94xx.h

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *

drivers/scsi/mvsas/mv_chips.h

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *

drivers/scsi/mvsas/mv_defs.h

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *

drivers/scsi/mvsas/mv_init.c

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *
@@ -25,7 +26,16 @@
 
 #include "mv_sas.h"
 
+static int lldd_max_execute_num = 1;
+module_param_named(collector, lldd_max_execute_num, int, S_IRUGO);
+MODULE_PARM_DESC(collector, "\n"
+	"\tIf greater than one, tells the SAS Layer to run in Task Collector\n"
+	"\tMode.  If 1 or 0, tells the SAS Layer to run in Direct Mode.\n"
+	"\tThe mvsas SAS LLDD supports both modes.\n"
+	"\tDefault: 1 (Direct Mode).\n");
+
 static struct scsi_transport_template *mvs_stt;
+struct kmem_cache *mvs_task_list_cache;
 static const struct mvs_chip_info mvs_chips[] = {
 	[chip_6320] =	{ 1, 2, 0x400, 17, 16,  9, &mvs_64xx_dispatch, },
 	[chip_6440] =	{ 1, 4, 0x400, 17, 16,  9, &mvs_64xx_dispatch, },
@@ -109,7 +119,6 @@ static void __devinit mvs_phy_init(struct mvs_info *mvi, int phy_id)
 
 static void mvs_free(struct mvs_info *mvi)
 {
-	int i;
 	struct mvs_wq *mwq;
 	int slot_nr;
 
@@ -121,12 +130,8 @@ static void mvs_free(struct mvs_info *mvi)
 	else
 		slot_nr = MVS_SLOTS;
 
-	for (i = 0; i < mvi->tags_num; i++) {
-		struct mvs_slot_info *slot = &mvi->slot_info[i];
-		if (slot->buf)
-			dma_free_coherent(mvi->dev, MVS_SLOT_BUF_SZ,
-					  slot->buf, slot->buf_dma);
-	}
+	if (mvi->dma_pool)
+		pci_pool_destroy(mvi->dma_pool);
 
 	if (mvi->tx)
 		dma_free_coherent(mvi->dev,
@@ -215,6 +220,7 @@ static irqreturn_t mvs_interrupt(int irq, void *opaque)
 static int __devinit mvs_alloc(struct mvs_info *mvi, struct Scsi_Host *shost)
 {
 	int i = 0, slot_nr;
+	char pool_name[32];
 
 	if (mvi->flags & MVF_FLAG_SOC)
 		slot_nr = MVS_SOC_SLOTS;
@@ -274,18 +280,14 @@ static int __devinit mvs_alloc(struct mvs_info *mvi, struct Scsi_Host *shost)
 	if (!mvi->bulk_buffer)
 		goto err_out;
 #endif
-	for (i = 0; i < slot_nr; i++) {
-		struct mvs_slot_info *slot = &mvi->slot_info[i];
-
-		slot->buf = dma_alloc_coherent(mvi->dev, MVS_SLOT_BUF_SZ,
-					       &slot->buf_dma, GFP_KERNEL);
-		if (!slot->buf) {
-			printk(KERN_DEBUG"failed to allocate slot->buf.\n");
+	sprintf(pool_name, "%s%d", "mvs_dma_pool", mvi->id);
+	mvi->dma_pool = pci_pool_create(pool_name, mvi->pdev, MVS_SLOT_BUF_SZ, 16, 0);
+	if (!mvi->dma_pool) {
+			printk(KERN_DEBUG "failed to create dma pool %s.\n", pool_name);
 			goto err_out;
-		}
-		memset(slot->buf, 0, MVS_SLOT_BUF_SZ);
-		++mvi->tags_num;
 	}
+	mvi->tags_num = slot_nr;
+
 	/* Initialize tags */
 	mvs_tag_init(mvi);
 	return 0;
@@ -486,7 +488,7 @@ static void  __devinit mvs_post_sas_ha_init(struct Scsi_Host *shost,
 
 	sha->num_phys = nr_core * chip_info->n_phy;
 
-	sha->lldd_max_execute_num = 1;
+	sha->lldd_max_execute_num = lldd_max_execute_num;
 
 	if (mvi->flags & MVF_FLAG_SOC)
 		can_queue = MVS_SOC_CAN_QUEUE;
@@ -710,6 +712,14 @@ static int __init mvs_init(void)
 	if (!mvs_stt)
 		return -ENOMEM;
 
+	mvs_task_list_cache = kmem_cache_create("mvs_task_list", sizeof(struct mvs_task_list),
+							 0, SLAB_HWCACHE_ALIGN, NULL);
+	if (!mvs_task_list_cache) {
+		rc = -ENOMEM;
+		mv_printk("%s: mvs_task_list_cache alloc failed! \n", __func__);
+		goto err_out;
+	}
+
 	rc = pci_register_driver(&mvs_pci_driver);
 
 	if (rc)
@@ -726,6 +736,7 @@ static void __exit mvs_exit(void)
 {
 	pci_unregister_driver(&mvs_pci_driver);
 	sas_release_transport(mvs_stt);
+	kmem_cache_destroy(mvs_task_list_cache);
 }
 
 module_init(mvs_init);

drivers/scsi/mvsas/mv_sas.h

@@ -3,6 +3,7 @@
  *
  * Copyright 2007 Red Hat, Inc.
  * Copyright 2008 Marvell. <kewei@marvell.com>
+ * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
  *
  * This file is licensed under GPLv2.
  *
@@ -67,6 +68,7 @@ extern struct mvs_tgt_initiator mvs_tgt;
 extern struct mvs_info *tgt_mvi;
 extern const struct mvs_dispatch mvs_64xx_dispatch;
 extern const struct mvs_dispatch mvs_94xx_dispatch;
+extern struct kmem_cache *mvs_task_list_cache;
 
 #define DEV_IS_EXPANDER(type)	\
 	((type == EDGE_DEV) || (type == FANOUT_DEV))
@@ -341,6 +343,7 @@ struct mvs_info {
 	dma_addr_t bulk_buffer_dma;
 #define TRASH_BUCKET_SIZE    	0x20000
 #endif
+	void *dma_pool;
 	struct mvs_slot_info slot_info[0];
 };
 
@@ -367,6 +370,11 @@ struct mvs_task_exec_info {
 	int n_elem;
 };
 
+struct mvs_task_list {
+	struct sas_task *task;
+	struct list_head list;
+};
+
 
 /******************** function prototype *********************/
 void mvs_get_sas_addr(void *buf, u32 buflen);