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/*
* Copyright (C) 2016 Cavium, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*/
#include <linux/module.h>
#include "cptpf.h"
static void cpt_send_msg_to_vf(struct cpt_device *cpt, int vf,
struct cpt_mbox *mbx)
{
/* Writing mbox(0) causes interrupt */
cpt_write_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 1),
mbx->data);
cpt_write_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 0), mbx->msg);
}
/* ACKs VF's mailbox message
* @vf: VF to which ACK to be sent
*/
static void cpt_mbox_send_ack(struct cpt_device *cpt, int vf,
struct cpt_mbox *mbx)
{
mbx->data = 0ull;
mbx->msg = CPT_MBOX_MSG_TYPE_ACK;
cpt_send_msg_to_vf(cpt, vf, mbx);
}
static void cpt_clear_mbox_intr(struct cpt_device *cpt, u32 vf)
{
/* W1C for the VF */
cpt_write_csr64(cpt->reg_base, CPTX_PF_MBOX_INTX(0, 0), (1 << vf));
}
/*
* Configure QLEN/Chunk sizes for VF
*/
static void cpt_cfg_qlen_for_vf(struct cpt_device *cpt, int vf, u32 size)
{
union cptx_pf_qx_ctl pf_qx_ctl;
pf_qx_ctl.u = cpt_read_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf));
pf_qx_ctl.s.size = size;
pf_qx_ctl.s.cont_err = true;
cpt_write_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf), pf_qx_ctl.u);
}
/*
* Configure VQ priority
*/
static void cpt_cfg_vq_priority(struct cpt_device *cpt, int vf, u32 pri)
{
union cptx_pf_qx_ctl pf_qx_ctl;
pf_qx_ctl.u = cpt_read_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf));
pf_qx_ctl.s.pri = pri;
cpt_write_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, vf), pf_qx_ctl.u);
}
static u8 cpt_bind_vq_to_grp(struct cpt_device *cpt, u8 q, u8 grp)
{
struct microcode *mcode = cpt->mcode;
union cptx_pf_qx_ctl pf_qx_ctl;
struct device *dev = &cpt->pdev->dev;
if (q >= CPT_MAX_VF_NUM) {
dev_err(dev, "Queues are more than cores in the group");
return -EINVAL;
}
if (grp >= CPT_MAX_CORE_GROUPS) {
dev_err(dev, "Request group is more than possible groups");
return -EINVAL;
}
if (grp >= cpt->next_mc_idx) {
dev_err(dev, "Request group is higher than available functional groups");
return -EINVAL;
}
pf_qx_ctl.u = cpt_read_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, q));
pf_qx_ctl.s.grp = mcode[grp].group;
cpt_write_csr64(cpt->reg_base, CPTX_PF_QX_CTL(0, q), pf_qx_ctl.u);
dev_dbg(dev, "VF %d TYPE %s", q, (mcode[grp].is_ae ? "AE" : "SE"));
return mcode[grp].is_ae ? AE_TYPES : SE_TYPES;
}
/* Interrupt handler to handle mailbox messages from VFs */
static void cpt_handle_mbox_intr(struct cpt_device *cpt, int vf)
{
struct cpt_vf_info *vfx = &cpt->vfinfo[vf];
struct cpt_mbox mbx = {};
u8 vftype;
struct device *dev = &cpt->pdev->dev;
/*
* MBOX[0] contains msg
* MBOX[1] contains data
*/
mbx.msg = cpt_read_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 0));
mbx.data = cpt_read_csr64(cpt->reg_base, CPTX_PF_VFX_MBOXX(0, vf, 1));
dev_dbg(dev, "%s: Mailbox msg 0x%llx from VF%d", __func__, mbx.msg, vf);
switch (mbx.msg) {
case CPT_MSG_VF_UP:
vfx->state = VF_STATE_UP;
try_module_get(THIS_MODULE);
cpt_mbox_send_ack(cpt, vf, &mbx);
break;
case CPT_MSG_READY:
mbx.msg = CPT_MSG_READY;
mbx.data = vf;
cpt_send_msg_to_vf(cpt, vf, &mbx);
break;
case CPT_MSG_VF_DOWN:
/* First msg in VF teardown sequence */
vfx->state = VF_STATE_DOWN;
module_put(THIS_MODULE);
cpt_mbox_send_ack(cpt, vf, &mbx);
break;
case CPT_MSG_QLEN:
vfx->qlen = mbx.data;
cpt_cfg_qlen_for_vf(cpt, vf, vfx->qlen);
cpt_mbox_send_ack(cpt, vf, &mbx);
break;
case CPT_MSG_QBIND_GRP:
vftype = cpt_bind_vq_to_grp(cpt, vf, (u8)mbx.data);
if ((vftype != AE_TYPES) && (vftype != SE_TYPES))
dev_err(dev, "Queue %d binding to group %llu failed",
vf, mbx.data);
else {
dev_dbg(dev, "Queue %d binding to group %llu successful",
vf, mbx.data);
mbx.msg = CPT_MSG_QBIND_GRP;
mbx.data = vftype;
cpt_send_msg_to_vf(cpt, vf, &mbx);
}
break;
case CPT_MSG_VQ_PRIORITY:
vfx->priority = mbx.data;
cpt_cfg_vq_priority(cpt, vf, vfx->priority);
cpt_mbox_send_ack(cpt, vf, &mbx);
break;
default:
dev_err(&cpt->pdev->dev, "Invalid msg from VF%d, msg 0x%llx\n",
vf, mbx.msg);
break;
}
}
void cpt_mbox_intr_handler (struct cpt_device *cpt, int mbx)
{
u64 intr;
u8 vf;
intr = cpt_read_csr64(cpt->reg_base, CPTX_PF_MBOX_INTX(0, 0));
dev_dbg(&cpt->pdev->dev, "PF interrupt Mbox%d 0x%llx\n", mbx, intr);
for (vf = 0; vf < CPT_MAX_VF_NUM; vf++) {
if (intr & (1ULL << vf)) {
dev_dbg(&cpt->pdev->dev, "Intr from VF %d\n", vf);
cpt_handle_mbox_intr(cpt, vf);
cpt_clear_mbox_intr(cpt, vf);
}
}
}
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