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Date:	Sun, 01 Jul 2007 12:31:23 -0400
From:	bo yang <bo.yang@....com>
To:	James.Bottomley@...elEye.com, akpm@...l.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	neela.kolli@....com, bo.yang@....com, sumant.patro@....com
Subject: [PATCH 1/4] scsi: megaraid_sas -- add hibernation support

The megaraid_sas driver doesn't support the hibernation, the
suspend/resume routine implemented to support the hibernation.

Signed-off-by: Bo Yang <bo.yang@....com>

---

drivers/scsi/megaraid/megaraid_sas.c |  308 +++++++++++++++++++------
drivers/scsi/megaraid/megaraid_sas.h |    1
2 files changed, 239 insertions(+), 70 deletions(-)

diff -rupN linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c
linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c
--- linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c 2007-06-20
02:18:24.000000000 -0400
+++ linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c 2007-06-30
03:21:27.000000000 -0400
@@ -1804,6 +1804,81 @@ static void megasas_complete_cmd_dpc(uns
 }
 
 /**
+ * megasas_issue_init_mfi - Initializes the FW
+ * @instance:  Adapter soft state
+ *
+ * Issues the INIT MFI cmd
+ */
+static int
+megasas_issue_init_mfi(struct megasas_instance *instance)
+{
+ u32 context;
+
+ struct megasas_cmd *cmd;
+
+ struct megasas_init_frame *init_frame;
+ struct megasas_init_queue_info *initq_info;
+ dma_addr_t init_frame_h;
+ dma_addr_t initq_info_h;
+
+	/*
+	 * Prepare a init frame. Note the init frame points to queue info
+	 * structure. Each frame has SGL allocated after first 64 bytes. For
+	 * this frame - since we don't need any SGL - we use SGL's space as
+	 * queue info structure
+	 *
+	 * We will not get a NULL command below. We just created the pool.
+	 */
+	cmd = megasas_get_cmd(instance);
+
+	init_frame = (struct megasas_init_frame *)cmd->frame;
+	initq_info = (struct megasas_init_queue_info *)
+	    ((unsigned long)init_frame + 64);
+
+	init_frame_h = cmd->frame_phys_addr;
+	initq_info_h = init_frame_h + 64;
+
+	context = init_frame->context;
+	memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
+	memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
+	init_frame->context = context;
+
+	initq_info->reply_queue_entries = instance->max_fw_cmds + 1;
+	initq_info->reply_queue_start_phys_addr_lo = instance->reply_queue_h;
+
+	initq_info->producer_index_phys_addr_lo = instance->producer_h;
+	initq_info->consumer_index_phys_addr_lo = instance->consumer_h;
+
+	init_frame->cmd = MFI_CMD_INIT;
+	init_frame->cmd_status = 0xFF;
+	init_frame->queue_info_new_phys_addr_lo = initq_info_h;
+
+	init_frame->data_xfer_len = sizeof(struct megasas_init_queue_info);
+
+	/*
+	 * disable the intr before firing the init frame to FW
+	 */
+	instance->instancet->disable_intr(instance->reg_set);
+
+	/*
+	 * Issue the init frame in polled mode
+	 */
+
+	if (megasas_issue_polled(instance, cmd)) {
+		printk(KERN_DEBUG "megasas: Failed to init firmware\n");
+		megasas_return_cmd(instance, cmd);
+		goto fail_fw_init;
+	}
+
+	megasas_return_cmd(instance, cmd);
+
+	return 0;
+
+	fail_fw_init:
+		return -EINVAL;
+}
+
+/**
  * megasas_init_mfi -	Initializes the FW
  * @instance:		Adapter soft state
  *
@@ -1816,15 +1891,7 @@ static int megasas_init_mfi(struct megas
 	u32 max_sectors_1;
 	u32 max_sectors_2;
 	struct megasas_register_set __iomem *reg_set;
-
-	struct megasas_cmd *cmd;
 	struct megasas_ctrl_info *ctrl_info;
-
-	struct megasas_init_frame *init_frame;
-	struct megasas_init_queue_info *initq_info;
-	dma_addr_t init_frame_h;
-	dma_addr_t initq_info_h;
-
 	/*
 	 * Map the message registers
 	 */
@@ -1901,52 +1968,8 @@ static int megasas_init_mfi(struct megas
 		goto fail_reply_queue;
 	}
 
-	/*
-	 * Prepare a init frame. Note the init frame points to queue info
-	 * structure. Each frame has SGL allocated after first 64 bytes. For
-	 * this frame - since we don't need any SGL - we use SGL's space as
-	 * queue info structure
-	 *
-	 * We will not get a NULL command below. We just created the pool.
-	 */
-	cmd = megasas_get_cmd(instance);
-
-	init_frame = (struct megasas_init_frame *)cmd->frame;
-	initq_info = (struct megasas_init_queue_info *)
-	    ((unsigned long)init_frame + 64);
-
-	init_frame_h = cmd->frame_phys_addr;
-	initq_info_h = init_frame_h + 64;
-
-	memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
-	memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
-
-	initq_info->reply_queue_entries = instance->max_fw_cmds + 1;
-	initq_info->reply_queue_start_phys_addr_lo = instance->reply_queue_h;
-
-	initq_info->producer_index_phys_addr_lo = instance->producer_h;
-	initq_info->consumer_index_phys_addr_lo = instance->consumer_h;
-
-	init_frame->cmd = MFI_CMD_INIT;
-	init_frame->cmd_status = 0xFF;
-	init_frame->queue_info_new_phys_addr_lo = initq_info_h;
-
-	init_frame->data_xfer_len = sizeof(struct megasas_init_queue_info);
-
-	/*
-	 * disable the intr before firing the init frame to FW
-	 */
-	instance->instancet->disable_intr(instance->reg_set);
-
-	/*
-	 * Issue the init frame in polled mode
-	 */
-	if (megasas_issue_polled(instance, cmd)) {
-		printk(KERN_DEBUG "megasas: Failed to init firmware\n");
+	if (megasas_issue_init_mfi(instance))
 		goto fail_fw_init;
-	}
-
-	megasas_return_cmd(instance, cmd);
 
 	ctrl_info = kmalloc(sizeof(struct megasas_ctrl_info), GFP_KERNEL);
 
@@ -1982,7 +2005,6 @@ static int megasas_init_mfi(struct megas
 	return 0;
 
       fail_fw_init:
-	megasas_return_cmd(instance, cmd);
 
 	pci_free_consistent(instance->pdev, reply_q_sz,
 			    instance->reply_queue, instance->reply_queue_h);
@@ -2264,6 +2286,28 @@ static int megasas_io_attach(struct mega
 	return 0;
 }
 
+static int
+megasas_set_dma_mask(struct pci_dev *pdev)
+{
+	/*
+	 * All our contollers are capable of performing 64-bit DMA
+	 */
+	if (IS_DMA64) {
+		if (pci_set_dma_mask(pdev, DMA_64BIT_MASK) != 0) {
+
+			if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
+				goto fail_set_dma_mask;
+		}
+	} else {
+		if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
+			goto fail_set_dma_mask;
+	}
+	return 0;
+
+fail_set_dma_mask:
+	return 1;
+}
+
 /**
  * megasas_probe_one -	PCI hotplug entry point
  * @pdev:		PCI device structure
@@ -2297,19 +2341,8 @@ megasas_probe_one(struct pci_dev *pdev, 
 
 	pci_set_master(pdev);
 
-	/*
-	 * All our contollers are capable of performing 64-bit DMA
-	 */
-	if (IS_DMA64) {
-		if (pci_set_dma_mask(pdev, DMA_64BIT_MASK) != 0) {
-
-			if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
-				goto fail_set_dma_mask;
-		}
-	} else {
-		if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
-			goto fail_set_dma_mask;
-	}
+	if (megasas_set_dma_mask(pdev))
+		goto fail_set_dma_mask;
 
 	host = scsi_host_alloc(&megasas_template,
 			       sizeof(struct megasas_instance));
@@ -2491,8 +2524,10 @@ static void megasas_flush_cache(struct m
 /**
  * megasas_shutdown_controller -	Instructs FW to shutdown the
controller
  * @instance:				Adapter soft state
+ * @opcode:				Shutdown/Hibernate
  */
-static void megasas_shutdown_controller(struct megasas_instance
*instance)
+static void megasas_shutdown_controller(struct megasas_instance
*instance,
+					u32 opcode)
 {
 	struct megasas_cmd *cmd;
 	struct megasas_dcmd_frame *dcmd;
@@ -2515,7 +2550,7 @@ static void megasas_shutdown_controller(
 	dcmd->flags = MFI_FRAME_DIR_NONE;
 	dcmd->timeout = 0;
 	dcmd->data_xfer_len = 0;
-	dcmd->opcode = MR_DCMD_CTRL_SHUTDOWN;
+	dcmd->opcode = opcode;
 
 	megasas_issue_blocked_cmd(instance, cmd);
 
@@ -2525,6 +2560,137 @@ static void megasas_shutdown_controller(
 }
 
 /**
+ * megasas_suspend -    driver suspend entry point
+ * @pdev:               PCI device structure
+ * @state:
+ */
+static int __devinit
+megasas_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        struct Scsi_Host *host;
+        struct megasas_instance *instance;
+
+        instance = pci_get_drvdata(pdev);
+        host = instance->host;
+
+        megasas_flush_cache(instance);
+        megasas_shutdown_controller(instance,
MR_DCMD_HIBERNATE_SHUTDOWN);
+        tasklet_kill(&instance->isr_tasklet);
+
+        pci_set_drvdata(instance->pdev, instance);
+        instance->instancet->disable_intr(instance->reg_set);
+        free_irq(instance->pdev->irq, instance);
+
+        scsi_host_put(host);
+
+        pci_save_state(pdev);
+        pci_disable_device(pdev);
+
+        pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+        return 0;
+}
+
+/**
+ * megasas_resume-      driver resume entry point
+ * @pdev:               PCI device structure
+ */
+static int __devinit
+megasas_resume(struct pci_dev *pdev)
+{
+        int rval;
+        struct Scsi_Host *host;
+        struct megasas_instance *instance;
+
+        instance = pci_get_drvdata(pdev);
+        host = instance->host;
+        pci_set_power_state(pdev, PCI_D0);
+        pci_enable_wake(pdev, PCI_D0, 0);
+        pci_restore_state(pdev);
+
+        /*
+         * PCI prepping: enable device set bus mastering and dma mask
+         */
+        rval = pci_enable_device(pdev);
+
+        if (rval) {
+                printk(KERN_INFO "megasas: Enable device failed\n");
+                return rval;
+        }
+
+        pci_set_master(pdev);
+
+        if (megasas_set_dma_mask(pdev))
+                goto fail_set_dma_mask;
+
+        /*
+         * Initialize MFI Firmware
+         */
+
+        *instance->producer = 0;
+        *instance->consumer = 0;
+
+        atomic_set(&instance->fw_outstanding,0);
+
+        /*
+         * We expect the FW state to be READY
+         */
+        if (megasas_transition_to_ready(instance))
+                goto fail_ready_state;
+
+        if (megasas_issue_init_mfi(instance))
+                goto fail_init_mfi;
+
+        tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
+                        (unsigned long)instance);
+
+        /*
+         * Register IRQ
+         */
+        if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED,
+                "megasas",instance)) {
+                printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
+                goto fail_irq;
+        }
+
+        instance->instancet->enable_intr(instance->reg_set);
+ 
+        /*
+         * Store instance in PCI softstate
+         */
+        pci_set_drvdata(pdev, instance);
+
+        /*
+         * Initiate AEN (Asynchronous Event Notification)
+         */
+        if (megasas_start_aen(instance))
+                printk(KERN_ERR "megasas: Start AEN failed\n");
+
+        return 0;
+
+      fail_irq:
+      fail_init_mfi:
+ 
+        if (instance->evt_detail)
+                pci_free_consistent(pdev, sizeof(struct
megasas_evt_detail),
+                                    instance->evt_detail,
+                                    instance->evt_detail_h);
+
+        if (instance->producer)
+                pci_free_consistent(pdev, sizeof(u32), instance-
>producer,
+                                    instance->producer_h);
+        if (instance->consumer)
+                pci_free_consistent(pdev, sizeof(u32), instance-
>consumer,
+                                    instance->consumer_h);
+        scsi_host_put(host);
+      fail_set_dma_mask:
+      fail_ready_state:
+        pci_disable_device(pdev);
+
+        return -ENODEV;
+}
+
+/**
  * megasas_detach_one -	PCI hot"un"plug entry point
  * @pdev:		PCI device structure
  */
@@ -2539,7 +2705,7 @@ static void megasas_detach_one(struct pc
 
 	scsi_remove_host(instance->host);
 	megasas_flush_cache(instance);
-	megasas_shutdown_controller(instance);
+	megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
 	tasklet_kill(&instance->isr_tasklet);
 
 	/*
@@ -2978,6 +3144,8 @@ static struct pci_driver megasas_pci_dri
 	.id_table = megasas_pci_table,
 	.probe = megasas_probe_one,
  .remove = __devexit_p(megasas_detach_one),
+ .suspend = megasas_suspend,
+ .resume = megasas_resume,
  .shutdown = megasas_shutdown,
 };
 
diff -rupN linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.h
linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.h
--- linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.h	2007-06-20
02:18:24.000000000 -0400
+++ linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.h	2007-06-18
01:50:49.000000000 -0400
@@ -117,6 +117,7 @@
 #define MR_FLUSH_DISK_CACHE			0x02
 
 #define MR_DCMD_CTRL_SHUTDOWN			0x01050000
+#define MR_DCMD_HIBERNATE_SHUTDOWN		0x01060000
 #define MR_ENABLE_DRIVE_SPINDOWN		0x01
 
 #define MR_DCMD_CTRL_EVENT_GET_INFO		0x01040100




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