[SCSI] be2iscsi: Adding crashdump support

These changes allow the driver to support crashdump. We need to reset the
chip incase of a crashdump

Signed-off-by: Jayamohan Kallickal <jayamohank@serverengines.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

4 files changed, 141 insertions, 1 deletions

diff --git a/drivers/scsi/be2iscsi/be_cmds.c b/drivers/scsi/be2iscsi/be_cmds.c
index 9cc1f5573150..7c7537335c88 100644
--- a/drivers/scsi/be2iscsi/be_cmds.c
+++ b/drivers/scsi/be2iscsi/be_cmds.c
@@ -19,6 +19,86 @@
 #include "be_mgmt.h"
 #include "be_main.h"
 
+int beiscsi_pci_soft_reset(struct beiscsi_hba *phba)
+{
+        u32 sreset;
+        u8 *pci_reset_offset = 0;
+        u8 *pci_online0_offset = 0;
+        u8 *pci_online1_offset = 0;
+        u32 pconline0 = 0;
+        u32 pconline1 = 0;
+        u32 i;
+
+        pci_reset_offset = (u8 *)phba->pci_va + BE2_SOFT_RESET;
+        pci_online0_offset = (u8 *)phba->pci_va + BE2_PCI_ONLINE0;
+        pci_online1_offset = (u8 *)phba->pci_va + BE2_PCI_ONLINE1;
+        sreset = readl((void *)pci_reset_offset);
+        sreset |= BE2_SET_RESET;
+        writel(sreset, (void *)pci_reset_offset);
+
+        i = 0;
+        while (sreset & BE2_SET_RESET) {
+                if (i > 64)
+                        break;
+                msleep(100);
+                sreset = readl((void *)pci_reset_offset);
+                i++;
+        }
+
+        if (sreset & BE2_SET_RESET) {
+                printk(KERN_ERR "Soft Reset  did not deassert\n");
+                return -EIO;
+        }
+        pconline1 = BE2_MPU_IRAM_ONLINE;
+        writel(pconline0, (void *)pci_online0_offset);
+        writel(pconline1, (void *)pci_online1_offset);
+
+        sreset = BE2_SET_RESET;
+        writel(sreset, (void *)pci_reset_offset);
+
+        i = 0;
+        while (sreset & BE2_SET_RESET) {
+                if (i > 64)
+                        break;
+                msleep(1);
+                sreset = readl((void *)pci_reset_offset);
+                i++;
+        }
+        if (sreset & BE2_SET_RESET) {
+                printk(KERN_ERR "MPU Online Soft Reset did not deassert\n");
+                return -EIO;
+        }
+        return 0;
+}
+
+int be_chk_reset_complete(struct beiscsi_hba *phba)
+{
+        unsigned int num_loop;
+        u8 *mpu_sem = 0;
+        u32 status;
+
+        num_loop = 1000;
+        mpu_sem = (u8 *)phba->csr_va + MPU_EP_SEMAPHORE;
+        msleep(5000);
+
+        while (num_loop) {
+                status = readl((void *)mpu_sem);
+
+                if ((status & 0x80000000) || (status & 0x0000FFFF) == 0xC000)
+                        break;
+                msleep(60);
+                num_loop--;
+        }
+
+        if ((status & 0x80000000) || (!num_loop)) {
+                printk(KERN_ERR "Failed in be_chk_reset_complete"
+                "status = 0x%x\n", status);
+                return -EIO;
+        }
+
+        return 0;
+}
+
 void be_mcc_notify(struct beiscsi_hba *phba)
 {
         struct be_queue_info *mccq = &phba->ctrl.mcc_obj.q;
diff --git a/drivers/scsi/be2iscsi/be_cmds.h b/drivers/scsi/be2iscsi/be_cmds.h
index 30a293f52ef7..0df19cb58a39 100644
--- a/drivers/scsi/be2iscsi/be_cmds.h
+++ b/drivers/scsi/be2iscsi/be_cmds.h
@@ -901,6 +901,9 @@ struct be_fw_cfg {
                                                  * the cxn
                                                  */
 
+int beiscsi_pci_soft_reset(struct beiscsi_hba *phba);
+int be_chk_reset_complete(struct beiscsi_hba *phba);
+
 void be_wrb_hdr_prepare(struct be_mcc_wrb *wrb, int payload_len,
                         bool embedded, u8 sge_cnt);
 
diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 67a7e3f7bae6..1a22125f5202 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -41,6 +41,8 @@
 static unsigned int be_iopoll_budget = 10;
 static unsigned int be_max_phys_size = 64;
 static unsigned int enable_msix = 1;
+static unsigned int gcrashmode = 0;
+static unsigned int num_hba = 0;
 
 MODULE_DEVICE_TABLE(pci, beiscsi_pci_id_table);
 MODULE_DESCRIPTION(DRV_DESC " " BUILD_STR);
@@ -3731,6 +3733,8 @@ static void beiscsi_remove(struct pci_dev *pcidev)
         struct hwi_context_memory *phwi_context;
         struct be_eq_obj *pbe_eq;
         unsigned int i, msix_vec;
+        u8 *real_offset = 0;
+        u32 value = 0;
 
         phba = (struct beiscsi_hba *)pci_get_drvdata(pcidev);
         if (!phba) {
@@ -3759,6 +3763,14 @@ static void beiscsi_remove(struct pci_dev *pcidev)
 
         beiscsi_clean_port(phba);
         beiscsi_free_mem(phba);
+        real_offset = (u8 *)phba->csr_va + MPU_EP_SEMAPHORE;
+
+        value = readl((void *)real_offset);
+
+        if (value & 0x00010000) {
+                value &= 0xfffeffff;
+                writel(value, (void *)real_offset);
+        }
         beiscsi_unmap_pci_function(phba);
         pci_free_consistent(phba->pcidev,
                             phba->ctrl.mbox_mem_alloced.size,
@@ -3792,6 +3804,8 @@ static int __devinit beiscsi_dev_probe(struct pci_dev *pcidev,
         struct hwi_context_memory *phwi_context;
         struct be_eq_obj *pbe_eq;
         int ret, num_cpus, i;
+        u8 *real_offset = 0;
+        u32 value = 0;
 
         ret = beiscsi_enable_pci(pcidev);
         if (ret < 0) {
@@ -3837,6 +3851,33 @@ static int __devinit beiscsi_dev_probe(struct pci_dev *pcidev,
                 goto hba_free;
         }
 
+        if (!num_hba) {
+                real_offset = (u8 *)phba->csr_va + MPU_EP_SEMAPHORE;
+                value = readl((void *)real_offset);
+                if (value & 0x00010000) {
+                        gcrashmode++;
+                        shost_printk(KERN_ERR, phba->shost,
+                                "Loading Driver in crashdump mode\n");
+                        ret = beiscsi_pci_soft_reset(phba);
+                        if (ret) {
+                                shost_printk(KERN_ERR, phba->shost,
+                                        "Reset Failed. Aborting Crashdump\n");
+                                goto hba_free;
+                        }
+                        ret = be_chk_reset_complete(phba);
+                        if (ret) {
+                                shost_printk(KERN_ERR, phba->shost,
+                                        "Failed to get out of reset."
+                                        "Aborting Crashdump\n");
+                                goto hba_free;
+                        }
+                } else {
+                        value |= 0x00010000;
+                        writel(value, (void *)real_offset);
+                        num_hba++;
+                }
+        }
+
         spin_lock_init(&phba->io_sgl_lock);
         spin_lock_init(&phba->mgmt_sgl_lock);
         spin_lock_init(&phba->isr_lock);
@@ -3907,6 +3948,15 @@ free_twq:
         beiscsi_clean_port(phba);
         beiscsi_free_mem(phba);
 free_port:
+        real_offset = (u8 *)phba->csr_va + MPU_EP_SEMAPHORE;
+
+        value = readl((void *)real_offset);
+
+        if (value & 0x00010000) {
+                value &= 0xfffeffff;
+                writel(value, (void *)real_offset);
+        }
+
         pci_free_consistent(phba->pcidev,
                             phba->ctrl.mbox_mem_alloced.size,
                             phba->ctrl.mbox_mem_alloced.va,
diff --git a/drivers/scsi/be2iscsi/be_main.h b/drivers/scsi/be2iscsi/be_main.h
index e6ddddbbae7a..05ad76e48d80 100644
--- a/drivers/scsi/be2iscsi/be_main.h
+++ b/drivers/scsi/be2iscsi/be_main.h
@@ -69,7 +69,14 @@
 #define BEISCSI_NUM_DEVICES_SUPPORTED   0x01
 #define BEISCSI_MAX_FRAGS_INIT  192
 #define BE_NUM_MSIX_ENTRIES     1
-#define MPU_EP_SEMAPHORE        0xac
+
+#define MPU_EP_CONTROL          0
+#define MPU_EP_SEMAPHORE        0xac
+#define BE2_SOFT_RESET          0x5c
+#define BE2_PCI_ONLINE0         0xb0
+#define BE2_PCI_ONLINE1         0xb4
+#define BE2_SET_RESET           0x80
+#define BE2_MPU_IRAM_ONLINE     0x00000080
 
 #define BE_SENSE_INFO_SIZE              258
 #define BE_ISCSI_PDU_HEADER_SIZE        64