1 files changed, 351 insertions, 31 deletions

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 75f5079e5696..4e2b2afc13f2 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -55,6 +55,13 @@ enum {
         OIS     = 0x30, /* MU_OUTBOUND_INTERRUPT_STATUS */
         OIM     = 0x3c, /* MU_OUTBOUND_INTERRUPT_MASK */
 
+        YH2I_INT                                = 0x20,
+        YINT_EN                                 = 0x34,
+        YI2H_INT                                = 0x9c,
+        YI2H_INT_C                              = 0xa0,
+        YH2I_REQ                                = 0xc0,
+        YH2I_REQ_HI                             = 0xc4,
+
         /* MU register value */
         MU_INBOUND_DOORBELL_HANDSHAKE           = 1,
         MU_INBOUND_DOORBELL_REQHEADCHANGED      = 2,
@@ -95,9 +102,14 @@ enum {
         TASK_ATTRIBUTE_ORDERED                  = 0x2,
         TASK_ATTRIBUTE_ACA                      = 0x4,
 
+        SS_STS_NORMAL                           = 0x80000000,
+        SS_STS_DONE                             = 0x40000000,
+        SS_STS_HANDSHAKE                        = 0x20000000,
+
+        SS_HEAD_HANDSHAKE                       = 0x80,
+
         STEX_CDB_LENGTH                         = 16,
         STATUS_VAR_LEN                          = 128,
-        ST_MAX_SG                               = 32,
 
         /* sg flags */
         SG_CF_EOT                               = 0x80, /* end of table */
@@ -111,6 +123,7 @@ enum {
         st_vsc                                  = 1,
         st_yosemite                             = 2,
         st_seq                                  = 3,
+        st_yel                                  = 4,
 
         PASSTHRU_REQ_TYPE                       = 0x00000001,
         PASSTHRU_REQ_NO_WAKEUP                  = 0x00000100,
@@ -151,12 +164,26 @@ struct st_sgitem {
         __le64 addr;
 };
 
+struct st_ss_sgitem {
+        __le32 addr;
+        __le32 addr_hi;
+        __le32 count;
+};
+
 struct st_sgtable {
         __le16 sg_count;
         __le16 max_sg_count;
         __le32 sz_in_byte;
 };
 
+struct st_msg_header {
+        __le64 handle;
+        u8 flag;
+        u8 channel;
+        __le16 timeout;
+        u32 reserved;
+};
+
 struct handshake_frame {
         __le64 rb_phy;          /* request payload queue physical address */
         __le16 req_sz;          /* size of each request payload */
@@ -172,7 +199,8 @@ struct handshake_frame {
         __le32 partner_ver_build;
         __le32 extra_offset;    /* NEW */
         __le32 extra_size;      /* NEW */
-        u32 reserved1[2];
+        __le32 scratch_size;
+        u32 reserved1;
 };
 
 struct req_msg {
@@ -263,6 +291,10 @@ struct st_hba {
         struct Scsi_Host *host;
         struct pci_dev *pdev;
 
+        struct req_msg * (*alloc_rq) (struct st_hba *);
+        int (*map_sg)(struct st_hba *, struct req_msg *, struct st_ccb *);
+        void (*send) (struct st_hba *, struct req_msg *, u16);
+
         u32 req_head;
         u32 req_tail;
         u32 status_head;
@@ -272,6 +304,7 @@ struct st_hba {
         void *copy_buffer; /* temp buffer for driver-handled commands */
         struct st_ccb *ccb;
         struct st_ccb *wait_ccb;
+        __le32 *scratch;
 
         unsigned int mu_status;
         unsigned int cardtype;
@@ -284,6 +317,9 @@ struct st_hba {
 };
 
 struct st_card_info {
+        struct req_msg * (*alloc_rq) (struct st_hba *);
+        int (*map_sg)(struct st_hba *, struct req_msg *, struct st_ccb *);
+        void (*send) (struct st_hba *, struct req_msg *, u16);
         unsigned int max_id;
         unsigned int max_lun;
         unsigned int max_channel;
@@ -352,6 +388,12 @@ static struct req_msg *stex_alloc_req(struct st_hba *hba)
         return req;
 }
 
+static struct req_msg *stex_ss_alloc_req(struct st_hba *hba)
+{
+        return (struct req_msg *)(hba->dma_mem +
+                hba->req_head * hba->rq_size + sizeof(struct st_msg_header));
+}
+
 static int stex_map_sg(struct st_hba *hba,
         struct req_msg *req, struct st_ccb *ccb)
 {
@@ -384,6 +426,39 @@ static int stex_map_sg(struct st_hba *hba,
         return nseg;
 }
 
+static int stex_ss_map_sg(struct st_hba *hba,
+        struct req_msg *req, struct st_ccb *ccb)
+{
+        struct scsi_cmnd *cmd;
+        struct scatterlist *sg;
+        struct st_sgtable *dst;
+        struct st_ss_sgitem *table;
+        int i, nseg;
+
+        cmd = ccb->cmd;
+        nseg = scsi_dma_map(cmd);
+        BUG_ON(nseg < 0);
+        if (nseg) {
+                dst = (struct st_sgtable *)req->variable;
+
+                ccb->sg_count = nseg;
+                dst->sg_count = cpu_to_le16((u16)nseg);
+                dst->max_sg_count = cpu_to_le16(hba->host->sg_tablesize);
+                dst->sz_in_byte = cpu_to_le32(scsi_bufflen(cmd));
+
+                table = (struct st_ss_sgitem *)(dst + 1);
+                scsi_for_each_sg(cmd, sg, nseg, i) {
+                        table[i].count = cpu_to_le32((u32)sg_dma_len(sg));
+                        table[i].addr =
+                                cpu_to_le32(sg_dma_address(sg) & 0xffffffff);
+                        table[i].addr_hi =
+                                cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
+                }
+        }
+
+        return nseg;
+}
+
 static void stex_controller_info(struct st_hba *hba, struct st_ccb *ccb)
 {
         struct st_frame *p;
@@ -424,6 +499,37 @@ stex_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
         readl(hba->mmio_base + IDBL); /* flush */
 }
 
+static void
+stex_ss_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
+{
+        struct scsi_cmnd *cmd;
+        struct st_msg_header *msg_h;
+        dma_addr_t addr;
+
+        req->tag = cpu_to_le16(tag);
+
+        hba->ccb[tag].req = req;
+        hba->out_req_cnt++;
+
+        cmd = hba->ccb[tag].cmd;
+        msg_h = (struct st_msg_header *)req - 1;
+        if (likely(cmd)) {
+                msg_h->channel = (u8)cmd->device->channel;
+                msg_h->timeout = cpu_to_le16(cmd->request->timeout/HZ);
+        }
+        addr = hba->dma_handle + hba->req_head * hba->rq_size;
+        addr += (hba->ccb[tag].sg_count+4)/11;
+        msg_h->handle = cpu_to_le64(addr);
+
+        ++hba->req_head;
+        hba->req_head %= hba->rq_count+1;
+
+        writel((addr >> 16) >> 16, hba->mmio_base + YH2I_REQ_HI);
+        readl(hba->mmio_base + YH2I_REQ_HI); /* flush */
+        writel(addr, hba->mmio_base + YH2I_REQ);
+        readl(hba->mmio_base + YH2I_REQ); /* flush */
+}
+
 static int
 stex_slave_alloc(struct scsi_device *sdev)
 {
@@ -504,7 +610,8 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
         case INQUIRY:
                 if (id != host->max_id - 1)
                         break;
-                if (lun == 0 && (cmd->cmnd[1] & INQUIRY_EVPD) == 0) {
+                if (!lun && !cmd->device->channel &&
+                        (cmd->cmnd[1] & INQUIRY_EVPD) == 0) {
                         scsi_sg_copy_from_buffer(cmd, (void *)console_inq_page,
                                                  sizeof(console_inq_page));
                         cmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8;
@@ -542,7 +649,7 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
         if (unlikely(tag >= host->can_queue))
                 return SCSI_MLQUEUE_HOST_BUSY;
 
-        req = stex_alloc_req(hba);
+        req = hba->alloc_rq(hba);
 
         req->lun = lun;
         req->target = id;
@@ -561,10 +668,12 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
         hba->ccb[tag].sense_bufflen = SCSI_SENSE_BUFFERSIZE;
         hba->ccb[tag].sense_buffer = cmd->sense_buffer;
 
-        if (cmd->sc_data_direction != DMA_NONE)
-                stex_map_sg(hba, req, &hba->ccb[tag]);
+        if (!hba->map_sg(hba, req, &hba->ccb[tag])) {
+                hba->ccb[tag].sg_count = 0;
+                memset(&req->variable[0], 0, 8);
+        }
 
-        stex_send_cmd(hba, req, tag);
+        hba->send(hba, req, tag);
         return 0;
 }
 
@@ -746,7 +855,103 @@ static irqreturn_t stex_intr(int irq, void *__hba)
         return IRQ_RETVAL(handled);
 }
 
-static int stex_handshake(struct st_hba *hba)
+static void stex_ss_mu_intr(struct st_hba *hba)
+{
+        struct status_msg *resp;
+        struct st_ccb *ccb;
+        __le32 *scratch;
+        unsigned int size;
+        int count = 0;
+        u32 value;
+        u16 tag;
+
+        if (unlikely(hba->out_req_cnt <= 0 ||
+                        hba->mu_status == MU_STATE_RESETTING))
+                return;
+
+        while (count < hba->sts_count) {
+                scratch = hba->scratch + hba->status_tail;
+                value = le32_to_cpu(*scratch);
+                if (unlikely(!(value & SS_STS_NORMAL)))
+                        return;
+
+                resp = hba->status_buffer + hba->status_tail;
+                *scratch = 0;
+                ++count;
+                ++hba->status_tail;
+                hba->status_tail %= hba->sts_count+1;
+
+                tag = (u16)value;
+                if (unlikely(tag >= hba->host->can_queue)) {
+                        printk(KERN_WARNING DRV_NAME
+                                        "(%s): invalid tag\n", pci_name(hba->pdev));
+                        continue;
+                }
+
+                hba->out_req_cnt--;
+                ccb = &hba->ccb[tag];
+                if (unlikely(hba->wait_ccb == ccb))
+                        hba->wait_ccb = NULL;
+                if (unlikely(ccb->req == NULL)) {
+                        printk(KERN_WARNING DRV_NAME
+                                "(%s): lagging req\n", pci_name(hba->pdev));
+                        continue;
+                }
+
+                ccb->req = NULL;
+                if (likely(value & SS_STS_DONE)) { /* normal case */
+                        ccb->srb_status = SRB_STATUS_SUCCESS;
+                        ccb->scsi_status = SAM_STAT_GOOD;
+                } else {
+                        ccb->srb_status = resp->srb_status;
+                        ccb->scsi_status = resp->scsi_status;
+                        size = resp->payload_sz * sizeof(u32);
+                        if (unlikely(size < sizeof(*resp) - STATUS_VAR_LEN ||
+                                size > sizeof(*resp))) {
+                                printk(KERN_WARNING DRV_NAME
+                                        "(%s): bad status size\n",
+                                        pci_name(hba->pdev));
+                        } else {
+                                size -= sizeof(*resp) - STATUS_VAR_LEN;
+                                if (size)
+                                        stex_copy_data(ccb, resp, size);
+                        }
+                        if (likely(ccb->cmd != NULL))
+                                stex_check_cmd(hba, ccb, resp);
+                }
+
+                if (likely(ccb->cmd != NULL)) {
+                        scsi_dma_unmap(ccb->cmd);
+                        stex_scsi_done(ccb);
+                } else
+                        ccb->req_type = 0;
+        }
+}
+
+static irqreturn_t stex_ss_intr(int irq, void *__hba)
+{
+        struct st_hba *hba = __hba;
+        void __iomem *base = hba->mmio_base;
+        u32 data;
+        unsigned long flags;
+        int handled = 0;
+
+        spin_lock_irqsave(hba->host->host_lock, flags);
+
+        data = readl(base + YI2H_INT);
+        if (data && data != 0xffffffff) {
+                /* clear the interrupt */
+                writel(data, base + YI2H_INT_C);
+                stex_ss_mu_intr(hba);
+                handled = 1;
+        }
+
+        spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+        return IRQ_RETVAL(handled);
+}
+
+static int stex_common_handshake(struct st_hba *hba)
 {
         void __iomem *base = hba->mmio_base;
         struct handshake_frame *h;
@@ -827,10 +1032,79 @@ static int stex_handshake(struct st_hba *hba)
         readl(base + IMR1);
         writel(0, base + OMR1);
         readl(base + OMR1); /* flush */
-        hba->mu_status = MU_STATE_STARTED;
         return 0;
 }
 
+static int stex_ss_handshake(struct st_hba *hba)
+{
+        void __iomem *base = hba->mmio_base;
+        struct st_msg_header *msg_h;
+        struct handshake_frame *h;
+        __le32 *scratch = hba->scratch;
+        u32 data;
+        unsigned long before;
+        int ret = 0;
+
+        h = (struct handshake_frame *)(hba->alloc_rq(hba));
+        msg_h = (struct st_msg_header *)h - 1;
+        msg_h->handle = cpu_to_le64(hba->dma_handle);
+        msg_h->flag = SS_HEAD_HANDSHAKE;
+
+        h->rb_phy = cpu_to_le64(hba->dma_handle);
+        h->req_sz = cpu_to_le16(hba->rq_size);
+        h->req_cnt = cpu_to_le16(hba->rq_count+1);
+        h->status_sz = cpu_to_le16(sizeof(struct status_msg));
+        h->status_cnt = cpu_to_le16(hba->sts_count+1);
+        stex_gettime(&h->hosttime);
+        h->partner_type = HMU_PARTNER_TYPE;
+        h->extra_offset = h->extra_size = 0;
+        h->scratch_size = cpu_to_le32((hba->sts_count+1)*sizeof(u32));
+
+        data = readl(base + YINT_EN);
+        data &= ~4;
+        writel(data, base + YINT_EN);
+        writel((hba->dma_handle >> 16) >> 16, base + YH2I_REQ_HI);
+        writel(hba->dma_handle, base + YH2I_REQ);
+
+        scratch = hba->scratch;
+        before = jiffies;
+        while (!(le32_to_cpu(*scratch) & SS_STS_HANDSHAKE)) {
+                if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+                        printk(KERN_ERR DRV_NAME
+                                "(%s): no signature after handshake frame\n",
+                                pci_name(hba->pdev));
+                        ret = -1;
+                        break;
+                }
+                rmb();
+                msleep(1);
+        }
+
+        *scratch = 0;
+        msg_h->flag = 0;
+        return ret;
+}
+
+static int stex_handshake(struct st_hba *hba)
+{
+        int err;
+        unsigned long flags;
+
+        err = (hba->cardtype == st_yel) ?
+                stex_ss_handshake(hba) : stex_common_handshake(hba);
+        if (err == 0) {
+                spin_lock_irqsave(hba->host->host_lock, flags);
+                hba->req_head = 0;
+                hba->req_tail = 0;
+                hba->status_head = 0;
+                hba->status_tail = 0;
+                hba->out_req_cnt = 0;
+                hba->mu_status = MU_STATE_STARTED;
+                spin_unlock_irqrestore(hba->host->host_lock, flags);
+        }
+        return err;
+}
+
 static int stex_abort(struct scsi_cmnd *cmd)
 {
         struct Scsi_Host *host = cmd->device->host;
@@ -859,15 +1133,23 @@ static int stex_abort(struct scsi_cmnd *cmd)
                         goto out;
         }
 
-        data = readl(base + ODBL);
-        if (data == 0 || data == 0xffffffff)
-                goto fail_out;
+        if (hba->cardtype == st_yel) {
+                data = readl(base + YI2H_INT);
+                if (data == 0 || data == 0xffffffff)
+                        goto fail_out;
 
-        writel(data, base + ODBL);
-        readl(base + ODBL); /* flush */
+                writel(data, base + YI2H_INT_C);
+                stex_ss_mu_intr(hba);
+        } else {
+                data = readl(base + ODBL);
+                if (data == 0 || data == 0xffffffff)
+                        goto fail_out;
 
-        stex_mu_intr(hba, data);
+                writel(data, base + ODBL);
+                readl(base + ODBL); /* flush */
 
+                stex_mu_intr(hba, data);
+        }
         if (hba->wait_ccb == NULL) {
                 printk(KERN_WARNING DRV_NAME
                         "(%s): lost interrupt\n", pci_name(hba->pdev));
@@ -947,13 +1229,6 @@ static int stex_reset(struct scsi_cmnd *cmd)
                                 pci_name(hba->pdev));
                         return FAILED;
                 }
-                spin_lock_irqsave(hba->host->host_lock, flags);
-                hba->req_head = 0;
-                hba->req_tail = 0;
-                hba->status_head = 0;
-                hba->status_tail = 0;
-                hba->out_req_cnt = 0;
-                spin_unlock_irqrestore(hba->host->host_lock, flags);
                 return SUCCESS;
         }
 
@@ -1021,7 +1296,6 @@ static struct scsi_host_template driver_template = {
         .eh_abort_handler               = stex_abort,
         .eh_host_reset_handler          = stex_reset,
         .this_id                        = -1,
-        .sg_tablesize                   = ST_MAX_SG,
 };
 
 static struct pci_device_id stex_pci_tbl[] = {
@@ -1039,10 +1313,14 @@ static struct pci_device_id stex_pci_tbl[] = {
         { 0x105a, 0x7250, PCI_ANY_ID, PCI_ANY_ID, 0, 0, st_vsc },
 
         /* st_yosemite */
-        { 0x105a, 0x8650, PCI_ANY_ID, PCI_ANY_ID, 0, 0, st_yosemite },
+        { 0x105a, 0x8650, 0x105a, PCI_ANY_ID, 0, 0, st_yosemite },
 
         /* st_seq */
         { 0x105a, 0x3360, PCI_ANY_ID, PCI_ANY_ID, 0, 0, st_seq },
+
+        /* st_yel */
+        { 0x105a, 0x8650, 0x1033, PCI_ANY_ID, 0, 0, st_yel },
+        { 0x105a, 0x8760, PCI_ANY_ID, PCI_ANY_ID, 0, 0, st_yel },
         { }     /* terminate list */
 };
 
@@ -1055,6 +1333,9 @@ static struct st_card_info stex_card_info[] = {
                 .rq_count       = 32,
                 .rq_size        = 1048,
                 .sts_count      = 32,
+                .alloc_rq       = stex_alloc_req,
+                .map_sg         = stex_map_sg,
+                .send           = stex_send_cmd,
         },
 
         /* st_vsc */
@@ -1065,6 +1346,9 @@ static struct st_card_info stex_card_info[] = {
                 .rq_count       = 32,
                 .rq_size        = 1048,
                 .sts_count      = 32,
+                .alloc_rq       = stex_alloc_req,
+                .map_sg         = stex_map_sg,
+                .send           = stex_send_cmd,
         },
 
         /* st_yosemite */
@@ -1075,6 +1359,9 @@ static struct st_card_info stex_card_info[] = {
                 .rq_count       = 256,
                 .rq_size        = 1048,
                 .sts_count      = 256,
+                .alloc_rq       = stex_alloc_req,
+                .map_sg         = stex_map_sg,
+                .send           = stex_send_cmd,
         },
 
         /* st_seq */
@@ -1085,6 +1372,22 @@ static struct st_card_info stex_card_info[] = {
                 .rq_count       = 32,
                 .rq_size        = 1048,
                 .sts_count      = 32,
+                .alloc_rq       = stex_alloc_req,
+                .map_sg         = stex_map_sg,
+                .send           = stex_send_cmd,
+        },
+
+        /* st_yel */
+        {
+                .max_id         = 129,
+                .max_lun        = 256,
+                .max_channel    = 3,
+                .rq_count       = 801,
+                .rq_size        = 512,
+                .sts_count      = 801,
+                .alloc_rq       = stex_ss_alloc_req,
+                .map_sg         = stex_ss_map_sg,
+                .send           = stex_ss_send_cmd,
         },
 };
 
@@ -1117,7 +1420,8 @@ static int stex_request_irq(struct st_hba *hba)
         } else
                 hba->msi_enabled = 0;
 
-        status = request_irq(pdev->irq, stex_intr, IRQF_SHARED, DRV_NAME, hba);
+        status = request_irq(pdev->irq, hba->cardtype == st_yel ?
+                stex_ss_intr : stex_intr, IRQF_SHARED, DRV_NAME, hba);
 
         if (status != 0) {
                 if (hba->msi_enabled)
@@ -1141,7 +1445,7 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         struct st_hba *hba;
         struct Scsi_Host *host;
         const struct st_card_info *ci = NULL;
-        u32 sts_offset, cp_offset;
+        u32 sts_offset, cp_offset, scratch_offset;
         int err;
 
         err = pci_enable_device(pdev);
@@ -1186,7 +1490,9 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
         hba->cardtype = (unsigned int) id->driver_data;
         ci = &stex_card_info[hba->cardtype];
-        sts_offset = (ci->rq_count+1) * ci->rq_size;
+        sts_offset = scratch_offset = (ci->rq_count+1) * ci->rq_size;
+        if (hba->cardtype == st_yel)
+                sts_offset += (ci->sts_count+1) * sizeof(u32);
         cp_offset = sts_offset + (ci->sts_count+1) * sizeof(struct status_msg);
         hba->dma_size = cp_offset + sizeof(struct st_frame);
         if (hba->cardtype == st_seq ||
@@ -1211,13 +1517,22 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
                 goto out_pci_free;
         }
 
+        if (hba->cardtype == st_yel)
+                hba->scratch = (__le32 *)(hba->dma_mem + scratch_offset);
         hba->status_buffer = (struct status_msg *)(hba->dma_mem + sts_offset);
         hba->copy_buffer = hba->dma_mem + cp_offset;
         hba->rq_count = ci->rq_count;
         hba->rq_size = ci->rq_size;
         hba->sts_count = ci->sts_count;
+        hba->alloc_rq = ci->alloc_rq;
+        hba->map_sg = ci->map_sg;
+        hba->send = ci->send;
         hba->mu_status = MU_STATE_STARTING;
 
+        if (hba->cardtype == st_yel)
+                host->sg_tablesize = 38;
+        else
+                host->sg_tablesize = 32;
         host->can_queue = ci->rq_count;
         host->cmd_per_lun = ci->rq_count;
         host->max_id = ci->max_id;
@@ -1282,15 +1597,20 @@ out_disable:
 static void stex_hba_stop(struct st_hba *hba)
 {
         struct req_msg *req;
+        struct st_msg_header *msg_h;
         unsigned long flags;
         unsigned long before;
         u16 tag = 0;
 
         spin_lock_irqsave(hba->host->host_lock, flags);
-        req = stex_alloc_req(hba);
-        memset(req->cdb, 0, STEX_CDB_LENGTH);
+        req = hba->alloc_rq(hba);
+        if (hba->cardtype == st_yel) {
+                msg_h = (struct st_msg_header *)req - 1;
+                memset(msg_h, 0, hba->rq_size);
+        } else
+                memset(req, 0, hba->rq_size);
 
-        if (hba->cardtype == st_yosemite) {
+        if (hba->cardtype == st_yosemite || hba->cardtype == st_yel) {
                 req->cdb[0] = MGT_CMD;
                 req->cdb[1] = MGT_CMD_SIGNATURE;
                 req->cdb[2] = CTLR_CONFIG_CMD;
@@ -1307,7 +1627,7 @@ static void stex_hba_stop(struct st_hba *hba)
         hba->ccb[tag].sense_buffer = NULL;
         hba->ccb[tag].req_type = PASSTHRU_REQ_TYPE;
 
-        stex_send_cmd(hba, req, tag);
+        hba->send(hba, req, tag);
         spin_unlock_irqrestore(hba->host->host_lock, flags);
 
         before = jiffies;