[SCSI] mvsas: Add driver version and interrupt coalescing to device attributes in sysfs

Signed-off-by: Xiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

4 files changed, 126 insertions, 2 deletions

diff --git a/drivers/scsi/mvsas/mv_64xx.c b/drivers/scsi/mvsas/mv_64xx.c
index 0e13e6441da7..c88b8a7ed398 100644
--- a/drivers/scsi/mvsas/mv_64xx.c
+++ b/drivers/scsi/mvsas/mv_64xx.c
@@ -402,7 +402,7 @@ static int __devinit mvs_64xx_init(struct mvs_info *mvi)
         tmp = 0;
         mw32(MVS_INT_COAL, tmp);
 
-        tmp = 0x100;
+        tmp = 0x10000 | interrupt_coalescing;
         mw32(MVS_INT_COAL_TMOUT, tmp);
 
         /* ladies and gentlemen, start your engines */
@@ -758,6 +758,28 @@ void mvs_64xx_fix_dma(dma_addr_t buf_dma, int buf_len, int from, void *prd)
 }
 #endif
 
+static void mvs_64xx_tune_interrupt(struct mvs_info *mvi, u32 time)
+{
+        void __iomem *regs = mvi->regs;
+        u32 tmp = 0;
+        /* interrupt coalescing may cause missing HW interrput in some case,
+         * and the max count is 0x1ff, while our max slot is 0x200,
+         * it will make count 0.
+         */
+        if (time == 0) {
+                mw32(MVS_INT_COAL, 0);
+                mw32(MVS_INT_COAL_TMOUT, 0x10000);
+        } else {
+                if (MVS_CHIP_SLOT_SZ > 0x1ff)
+                        mw32(MVS_INT_COAL, 0x1ff|COAL_EN);
+                else
+                        mw32(MVS_INT_COAL, MVS_CHIP_SLOT_SZ|COAL_EN);
+
+                tmp = 0x10000 | time;
+                mw32(MVS_INT_COAL_TMOUT, tmp);
+        }
+}
+
 const struct mvs_dispatch mvs_64xx_dispatch = {
         "mv64xx",
         mvs_64xx_init,
@@ -811,6 +833,7 @@ const struct mvs_dispatch mvs_64xx_dispatch = {
 #ifndef DISABLE_HOTPLUG_DMA_FIX
         mvs_64xx_fix_dma,
 #endif
+        mvs_64xx_tune_interrupt,
         NULL,
 };
 
diff --git a/drivers/scsi/mvsas/mv_94xx.c b/drivers/scsi/mvsas/mv_94xx.c
index 3f2ad934c917..e589f31cb2b4 100644
--- a/drivers/scsi/mvsas/mv_94xx.c
+++ b/drivers/scsi/mvsas/mv_94xx.c
@@ -475,7 +475,7 @@ static int __devinit mvs_94xx_init(struct mvs_info *mvi)
         tmp = 0;
         mw32(MVS_INT_COAL, tmp);
 
-        tmp = 0x100;
+        tmp = 0x10000 | interrupt_coalescing;
         mw32(MVS_INT_COAL_TMOUT, tmp);
 
         /* ladies and gentlemen, start your engines */
@@ -894,6 +894,29 @@ static void mvs_94xx_clear_srs_irq(struct mvs_info *mvi, u8 reg_set,
 {
 }
 
+static void mvs_94xx_tune_interrupt(struct mvs_info *mvi, u32 time)
+{
+        void __iomem *regs = mvi->regs;
+        u32 tmp = 0;
+        /* interrupt coalescing may cause missing HW interrput in some case,
+         * and the max count is 0x1ff, while our max slot is 0x200,
+         * it will make count 0.
+         */
+        if (time == 0) {
+                mw32(MVS_INT_COAL, 0);
+                mw32(MVS_INT_COAL_TMOUT, 0x10000);
+        } else {
+                if (MVS_CHIP_SLOT_SZ > 0x1ff)
+                        mw32(MVS_INT_COAL, 0x1ff|COAL_EN);
+                else
+                        mw32(MVS_INT_COAL, MVS_CHIP_SLOT_SZ|COAL_EN);
+
+                tmp = 0x10000 | time;
+                mw32(MVS_INT_COAL_TMOUT, tmp);
+        }
+
+}
+
 const struct mvs_dispatch mvs_94xx_dispatch = {
         "mv94xx",
         mvs_94xx_init,
@@ -947,6 +970,7 @@ const struct mvs_dispatch mvs_94xx_dispatch = {
 #ifndef DISABLE_HOTPLUG_DMA_FIX
         mvs_94xx_fix_dma,
 #endif
+        mvs_94xx_tune_interrupt,
         mvs_94xx_non_spec_ncq_error,
 };
 
diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
index 9f1cccc2a3ed..531093ddc418 100644
--- a/drivers/scsi/mvsas/mv_init.c
+++ b/drivers/scsi/mvsas/mv_init.c
@@ -34,6 +34,8 @@ MODULE_PARM_DESC(collector, "\n"
         "\tThe mvsas SAS LLDD supports both modes.\n"
         "\tDefault: 1 (Direct Mode).\n");
 
+int interrupt_coalescing = 0x80;
+
 static struct scsi_transport_template *mvs_stt;
 struct kmem_cache *mvs_task_list_cache;
 static const struct mvs_chip_info mvs_chips[] = {
@@ -48,6 +50,8 @@ static const struct mvs_chip_info mvs_chips[] = {
         [chip_1320] =   { 2, 4, 0x800, 17, 64,  9, &mvs_94xx_dispatch, },
 };
 
+struct device_attribute *mvst_host_attrs[];
+
 #define SOC_SAS_NUM 2
 #define SG_MX 64
 
@@ -74,6 +78,7 @@ static struct scsi_host_template mvs_sht = {
         .slave_alloc            = mvs_slave_alloc,
         .target_destroy         = sas_target_destroy,
         .ioctl                  = sas_ioctl,
+        .shost_attrs            = mvst_host_attrs,
 };
 
 static struct sas_domain_function_template mvs_transport_ops = {
@@ -706,6 +711,70 @@ static struct pci_driver mvs_pci_driver = {
         .remove         = __devexit_p(mvs_pci_remove),
 };
 
+static ssize_t
+mvs_show_driver_version(struct device *cdev,
+                struct device_attribute *attr,  char *buffer)
+{
+        return snprintf(buffer, PAGE_SIZE, "%s\n", DRV_VERSION);
+}
+
+static DEVICE_ATTR(driver_version,
+                         S_IRUGO,
+                         mvs_show_driver_version,
+                         NULL);
+
+static ssize_t
+mvs_store_interrupt_coalescing(struct device *cdev,
+                        struct device_attribute *attr,
+                        const char *buffer, size_t size)
+{
+        int val = 0;
+        struct mvs_info *mvi = NULL;
+        struct Scsi_Host *shost = class_to_shost(cdev);
+        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
+        u8 i, core_nr;
+        if (buffer == NULL)
+                return size;
+
+        if (sscanf(buffer, "%d", &val) != 1)
+                return -EINVAL;
+
+        if (val >= 0x10000) {
+                mv_dprintk("interrupt coalescing timer %d us is"
+                        "too long\n", val);
+                return strlen(buffer);
+        }
+
+        interrupt_coalescing = val;
+
+        core_nr = ((struct mvs_prv_info *)sha->lldd_ha)->n_host;
+        mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[0];
+
+        if (unlikely(!mvi))
+                return -EINVAL;
+
+        for (i = 0; i < core_nr; i++) {
+                mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[i];
+                if (MVS_CHIP_DISP->tune_interrupt)
+                        MVS_CHIP_DISP->tune_interrupt(mvi,
+                                interrupt_coalescing);
+        }
+        mv_dprintk("set interrupt coalescing time to %d us\n",
+                interrupt_coalescing);
+        return strlen(buffer);
+}
+
+static ssize_t mvs_show_interrupt_coalescing(struct device *cdev,
+                        struct device_attribute *attr, char *buffer)
+{
+        return snprintf(buffer, PAGE_SIZE, "%d\n", interrupt_coalescing);
+}
+
+static DEVICE_ATTR(interrupt_coalescing,
+                         S_IRUGO|S_IWUSR,
+                         mvs_show_interrupt_coalescing,
+                         mvs_store_interrupt_coalescing);
+
 /* task handler */
 struct task_struct *mvs_th;
 static int __init mvs_init(void)
@@ -742,6 +811,12 @@ static void __exit mvs_exit(void)
         kmem_cache_destroy(mvs_task_list_cache);
 }
 
+struct device_attribute *mvst_host_attrs[] = {
+        &dev_attr_driver_version,
+        &dev_attr_interrupt_coalescing,
+        NULL,
+};
+
 module_init(mvs_init);
 module_exit(mvs_exit);
 
diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h
index ccd622f7f841..089ef1ef3865 100644
--- a/drivers/scsi/mvsas/mv_sas.h
+++ b/drivers/scsi/mvsas/mv_sas.h
@@ -64,6 +64,7 @@
 #endif
 #define MV_MAX_U32                      0xffffffff
 
+extern int interrupt_coalescing;
 extern struct mvs_tgt_initiator mvs_tgt;
 extern struct mvs_info *tgt_mvi;
 extern const struct mvs_dispatch mvs_64xx_dispatch;
@@ -170,6 +171,7 @@ struct mvs_dispatch {
 #ifndef DISABLE_HOTPLUG_DMA_FIX
         void (*dma_fix)(dma_addr_t buf_dma, int buf_len, int from, void *prd);
 #endif
+        void (*tune_interrupt)(struct mvs_info *mvi, u32 time);
         void (*non_spec_ncq_error)(struct mvs_info *mvi);
 
 };