drivers/crypto/cavium/cpt/cptpf_mbox.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2016 Cavium, Inc.
   4  */
   5 #include <linux/module.h>
   6 #include "cptpf.h"
   7
   8 static void cpt_send_msg_to_vf(struct cpt_device *cpt, int vf,
   9                                struct cpt_mbox *mbx)
  10 {
  11         /* Writing mbox(0) causes interrupt */
  12         cpt_write_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 1),
  13                         mbx->data);
  14         cpt_write_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 0), mbx->msg);
  15 }
  16
  17 /* ACKs VF's mailbox message
  18  * @vf: VF to which ACK to be sent
  19  */
  20 static void cpt_mbox_send_ack(struct cpt_device *cpt, int vf,
  21                               struct cpt_mbox *mbx)
  22 {
  23         mbx->data = 0ull;
  24         mbx->msg = CPT_MBOX_MSG_TYPE_ACK;
  25         cpt_send_msg_to_vf(cpt, vf, mbx);
  26 }
  27
  28 static void cpt_clear_mbox_intr(struct cpt_device *cpt, u32 vf)
  29 {
  30         /* W1C for the VF */
  31         cpt_write_csr64(cpt->reg_base, CPTX_PF_MBOX_INTX(0, 0), (1 << vf));
  32 }
  33
  34 /*
  35  *  Configure QLEN/Chunk sizes for VF
  36  */
  37 static void cpt_cfg_qlen_for_vf(struct cpt_device *cpt, int vf, u32 size)
  38 {
  39         union cptx_pf_qx_ctl pf_qx_ctl;
  40
  41         pf_qx_ctl.u = cpt_read_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf));
  42         pf_qx_ctl.s.size = size;
  43         pf_qx_ctl.s.cont_err = true;
  44         cpt_write_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf), pf_qx_ctl.u);
  45 }
  46
  47 /*
  48  * Configure VQ priority
  49  */
  50 static void cpt_cfg_vq_priority(struct cpt_device *cpt, int vf, u32 pri)
  51 {
  52         union cptx_pf_qx_ctl pf_qx_ctl;
  53
  54         pf_qx_ctl.u = cpt_read_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf));
  55         pf_qx_ctl.s.pri = pri;
  56         cpt_write_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf), pf_qx_ctl.u);
  57 }
  58
  59 static int cpt_bind_vq_to_grp(struct cpt_device *cpt, u8 q, u8 grp)
  60 {
  61         struct microcode *mcode = cpt->mcode;
  62         union cptx_pf_qx_ctl pf_qx_ctl;
  63         struct device *dev = &cpt->pdev->dev;
  64
  65         if (q >= CPT_MAX_VF_NUM) {
  66                 dev_err(dev, "Queues are more than cores in the group");
  67                 return -EINVAL;
  68         }
  69         if (grp >= CPT_MAX_CORE_GROUPS) {
  70                 dev_err(dev, "Request group is more than possible groups");
  71                 return -EINVAL;
  72         }
  73         if (grp >= cpt->next_mc_idx) {
  74                 dev_err(dev, "Request group is higher than available functional groups");
  75                 return -EINVAL;
  76         }
  77         pf_qx_ctl.u = cpt_read_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, q));
  78         pf_qx_ctl.s.grp = mcode[grp].group;
  79         cpt_write_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, q), pf_qx_ctl.u);
  80         dev_dbg(dev, "VF %d TYPE %s", q, (mcode[grp].is_ae ? "AE" : "SE"));
  81
  82         return mcode[grp].is_ae ? AE_TYPES : SE_TYPES;
  83 }
  84
  85 /* Interrupt handler to handle mailbox messages from VFs */
  86 static void cpt_handle_mbox_intr(struct cpt_device *cpt, int vf)
  87 {
  88         struct cpt_vf_info *vfx = &cpt->vfinfo[vf];
  89         struct cpt_mbox mbx = {};
  90         int vftype;
  91         struct device *dev = &cpt->pdev->dev;
  92         /*
  93          * MBOX[0] contains msg
  94          * MBOX[1] contains data
  95          */
  96         mbx.msg  = cpt_read_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 0));
  97         mbx.data = cpt_read_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 1));
  98         dev_dbg(dev, "%s: Mailbox msg 0x%llx from VF%d", __func__, mbx.msg, vf);
  99         switch (mbx.msg) {
 100         case CPT_MSG_VF_UP:
 101                 vfx->state = VF_STATE_UP;
 102                 try_module_get(THIS_MODULE);
 103                 cpt_mbox_send_ack(cpt, vf, &mbx);
 104                 break;
 105         case CPT_MSG_READY:
 106                 mbx.msg  = CPT_MSG_READY;
 107                 mbx.data = vf;
 108                 cpt_send_msg_to_vf(cpt, vf, &mbx);
 109                 break;
 110         case CPT_MSG_VF_DOWN:
 111                 /* First msg in VF teardown sequence */
 112                 vfx->state = VF_STATE_DOWN;
 113                 module_put(THIS_MODULE);
 114                 cpt_mbox_send_ack(cpt, vf, &mbx);
 115                 break;
 116         case CPT_MSG_QLEN:
 117                 vfx->qlen = mbx.data;
 118                 cpt_cfg_qlen_for_vf(cpt, vf, vfx->qlen);
 119                 cpt_mbox_send_ack(cpt, vf, &mbx);
 120                 break;
 121         case CPT_MSG_QBIND_GRP:
 122                 vftype = cpt_bind_vq_to_grp(cpt, vf, (u8)mbx.data);
 123                 if ((vftype != AE_TYPES) && (vftype != SE_TYPES))
 124                         dev_err(dev, "Queue %d binding to group %llu failed",
 125                                 vf, mbx.data);
 126                 else {
 127                         dev_dbg(dev, "Queue %d binding to group %llu successful",
 128                                 vf, mbx.data);
 129                         mbx.msg = CPT_MSG_QBIND_GRP;
 130                         mbx.data = vftype;
 131                         cpt_send_msg_to_vf(cpt, vf, &mbx);
 132                 }
 133                 break;
 134         case CPT_MSG_VQ_PRIORITY:
 135                 vfx->priority = mbx.data;
 136                 cpt_cfg_vq_priority(cpt, vf, vfx->priority);
 137                 cpt_mbox_send_ack(cpt, vf, &mbx);
 138                 break;
 139         default:
 140                 dev_err(&cpt->pdev->dev, "Invalid msg from VF%d, msg 0x%llx\n",
 141                         vf, mbx.msg);
 142                 break;
 143         }
 144 }
 145
 146 void cpt_mbox_intr_handler (struct cpt_device *cpt, int mbx)
 147 {
 148         u64 intr;
 149         u8  vf;
 150
 151         intr = cpt_read_csr64(cpt->reg_base, CPTX_PF_MBOX_INTX(0, 0));
 152         dev_dbg(&cpt->pdev->dev, "PF interrupt Mbox%d 0x%llx\n", mbx, intr);
 153         for (vf = 0; vf < CPT_MAX_VF_NUM; vf++) {
 154                 if (intr & (1ULL << vf)) {
 155                         dev_dbg(&cpt->pdev->dev, "Intr from VF %d\n", vf);
 156                         cpt_handle_mbox_intr(cpt, vf);
 157                         cpt_clear_mbox_intr(cpt, vf);
 158                 }
 159         }
 160 }