[SCSI] megaraid_sas: add the IEEE SGE support to SAS2 controller

To increase the performance, megaraid sas driver added the IEEE SGE
support to support SAS2 controller.

Signed-off-by Bo Yang<bo.yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 5afd651217258afb48c3287a4d3475606ba0fa86..4c04a68bad6c3fb2486ef4476dd349f06680d7df 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -696,6 +696,35 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
        return sge_count;
 }
 
+/**
+ * megasas_make_sgl_skinny - Prepares IEEE SGL
+ * @instance:           Adapter soft state
+ * @scp:                SCSI command from the mid-layer
+ * @mfi_sgl:            SGL to be filled in
+ *
+ * If successful, this function returns the number of SG elements. Otherwise,
+ * it returnes -1.
+ */
+static int
+megasas_make_sgl_skinny(struct megasas_instance *instance,
+               struct scsi_cmnd *scp, union megasas_sgl *mfi_sgl)
+{
+       int i;
+       int sge_count;
+       struct scatterlist *os_sgl;
+
+       sge_count = scsi_dma_map(scp);
+
+       if (sge_count) {
+               scsi_for_each_sg(scp, os_sgl, sge_count, i) {
+                       mfi_sgl->sge_skinny[i].length = sg_dma_len(os_sgl);
+                       mfi_sgl->sge_skinny[i].phys_addr =
+                                               sg_dma_address(os_sgl);
+               }
+       }
+       return sge_count;
+}
+
  /**
  * megasas_get_frame_count - Computes the number of frames
  * @frame_type         : type of frame- io or pthru frame
@@ -704,7 +733,8 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
  * Returns the number of frames required for numnber of sge's (sge_count)
  */
 
-static u32 megasas_get_frame_count(u8 sge_count, u8 frame_type)
+static u32 megasas_get_frame_count(struct megasas_instance *instance,
+                       u8 sge_count, u8 frame_type)
 {
        int num_cnt;
        int sge_bytes;
@@ -714,6 +744,10 @@ static u32 megasas_get_frame_count(u8 sge_count, u8 frame_type)
        sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
            sizeof(struct megasas_sge32);
 
+       if (instance->flag_ieee) {
+               sge_sz = sizeof(struct megasas_sge_skinny);
+       }
+
        /*
         * Main frame can contain 2 SGEs for 64-bit SGLs and
         * 3 SGEs for 32-bit SGLs for ldio &
@@ -721,12 +755,16 @@ static u32 megasas_get_frame_count(u8 sge_count, u8 frame_type)
         * 2 SGEs for 32-bit SGLs for pthru frame
         */
        if (unlikely(frame_type == PTHRU_FRAME)) {
-               if (IS_DMA64)
+               if (instance->flag_ieee == 1) {
+                       num_cnt = sge_count - 1;
+               } else if (IS_DMA64)
                        num_cnt = sge_count - 1;
                else
                        num_cnt = sge_count - 2;
        } else {
-               if (IS_DMA64)
+               if (instance->flag_ieee == 1) {
+                       num_cnt = sge_count - 1;
+               } else if (IS_DMA64)
                        num_cnt = sge_count - 2;
                else
                        num_cnt = sge_count - 3;
@@ -775,6 +813,10 @@ megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
        else if (scp->sc_data_direction == PCI_DMA_NONE)
                flags = MFI_FRAME_DIR_NONE;
 
+       if (instance->flag_ieee == 1) {
+               flags |= MFI_FRAME_IEEE;
+       }
+
        /*
         * Prepare the DCDB frame
         */
@@ -804,7 +846,11 @@ megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
        /*
         * Construct SGL
         */
-       if (IS_DMA64) {
+       if (instance->flag_ieee == 1) {
+               pthru->flags |= MFI_FRAME_SGL64;
+               pthru->sge_count = megasas_make_sgl_skinny(instance, scp,
+                                                     &pthru->sgl);
+       } else if (IS_DMA64) {
                pthru->flags |= MFI_FRAME_SGL64;
                pthru->sge_count = megasas_make_sgl64(instance, scp,
                                                      &pthru->sgl);
@@ -823,7 +869,7 @@ megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
         * Compute the total number of frames this command consumes. FW uses
         * this number to pull sufficient number of frames from host memory.
         */
-       cmd->frame_count = megasas_get_frame_count(pthru->sge_count,
+       cmd->frame_count = megasas_get_frame_count(instance, pthru->sge_count,
                                                        PTHRU_FRAME);
 
        return cmd->frame_count;
@@ -854,6 +900,10 @@ megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
        else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                flags = MFI_FRAME_DIR_READ;
 
+       if (instance->flag_ieee == 1) {
+               flags |= MFI_FRAME_IEEE;
+       }
+
        /*
         * Prepare the Logical IO frame: 2nd bit is zero for all read cmds
         */
@@ -924,7 +974,11 @@ megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
        /*
         * Construct SGL
         */
-       if (IS_DMA64) {
+       if (instance->flag_ieee) {
+               ldio->flags |= MFI_FRAME_SGL64;
+               ldio->sge_count = megasas_make_sgl_skinny(instance, scp,
+                                             &ldio->sgl);
+       } else if (IS_DMA64) {
                ldio->flags |= MFI_FRAME_SGL64;
                ldio->sge_count = megasas_make_sgl64(instance, scp, &ldio->sgl);
        } else
@@ -941,7 +995,8 @@ megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
         * Compute the total number of frames this command consumes. FW uses
         * this number to pull sufficient number of frames from host memory.
         */
-       cmd->frame_count = megasas_get_frame_count(ldio->sge_count, IO_FRAME);
+       cmd->frame_count = megasas_get_frame_count(instance,
+                       ldio->sge_count, IO_FRAME);
 
        return cmd->frame_count;
 }
@@ -1929,6 +1984,10 @@ static int megasas_create_frame_pool(struct megasas_instance *instance)
        sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
            sizeof(struct megasas_sge32);
 
+       if (instance->flag_ieee) {
+               sge_sz = sizeof(struct megasas_sge_skinny);
+       }
+
        /*
         * Calculated the number of 64byte frames required for SGL
         */
@@ -2725,6 +2784,11 @@ megasas_register_aen(struct megasas_instance *instance, u32 seq_num,
        dcmd->sgl.sge32[0].phys_addr = (u32) instance->evt_detail_h;
        dcmd->sgl.sge32[0].length = sizeof(struct megasas_evt_detail);
 
+       if (instance->aen_cmd != NULL) {
+               megasas_return_cmd(instance, cmd);
+               return 0;
+       }
+
        /*
         * Store reference to the cmd used to register for AEN. When an
         * application wants us to register for AEN, we have to abort this
@@ -2895,6 +2959,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
        *instance->producer = 0;
        *instance->consumer = 0;
        megasas_poll_wait_aen = 0;
+       instance->flag_ieee = 0;
 
        instance->evt_detail = pci_alloc_consistent(pdev,
                                                    sizeof(struct
@@ -2933,6 +2998,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 
        if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
+               instance->flag_ieee = 1;
                sema_init(&instance->ioctl_sem, MEGASAS_SKINNY_INT_CMDS);
        } else
                sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 4c78cd32e75784f069e639ea70f28f3750ca5bfe..a1fd44bc1817520f27ceb3bc33c823cde3a0e4b5 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -96,6 +96,7 @@
 #define MFI_FRAME_DIR_WRITE                    0x0008
 #define MFI_FRAME_DIR_READ                     0x0010
 #define MFI_FRAME_DIR_BOTH                     0x0018
+#define MFI_FRAME_IEEE                          0x0020
 
 /*
  * Definition for cmd_status
@@ -732,10 +733,17 @@ struct megasas_sge64 {
 
 } __attribute__ ((packed));
 
+struct megasas_sge_skinny {
+       u64 phys_addr;
+       u32 length;
+       u32 flag;
+} __packed;
+
 union megasas_sgl {
 
        struct megasas_sge32 sge32[1];
        struct megasas_sge64 sge64[1];
+       struct megasas_sge_skinny sge_skinny[1];
 
 } __attribute__ ((packed));
 
@@ -1210,6 +1218,7 @@ struct megasas_instance {
 
        u8 flag;
        u8 unload;
+       u8 flag_ieee;
        unsigned long last_time;
 
        struct timer_list io_completion_timer;