| /* |
| * QEMU IPMI KCS emulation |
| * |
| * Copyright (c) 2015,2017 Corey Minyard, MontaVista Software, LLC |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| #include "qemu/osdep.h" |
| #include "migration/vmstate.h" |
| #include "qemu/log.h" |
| #include "qapi/error.h" |
| #include "hw/ipmi/ipmi_kcs.h" |
| |
| #define IPMI_KCS_OBF_BIT 0 |
| #define IPMI_KCS_IBF_BIT 1 |
| #define IPMI_KCS_SMS_ATN_BIT 2 |
| #define IPMI_KCS_CD_BIT 3 |
| |
| #define IPMI_KCS_OBF_MASK (1 << IPMI_KCS_OBF_BIT) |
| #define IPMI_KCS_GET_OBF(d) (((d) >> IPMI_KCS_OBF_BIT) & 0x1) |
| #define IPMI_KCS_SET_OBF(d, v) (d) = (((d) & ~IPMI_KCS_OBF_MASK) | \ |
| (((v) & 1) << IPMI_KCS_OBF_BIT)) |
| #define IPMI_KCS_IBF_MASK (1 << IPMI_KCS_IBF_BIT) |
| #define IPMI_KCS_GET_IBF(d) (((d) >> IPMI_KCS_IBF_BIT) & 0x1) |
| #define IPMI_KCS_SET_IBF(d, v) (d) = (((d) & ~IPMI_KCS_IBF_MASK) | \ |
| (((v) & 1) << IPMI_KCS_IBF_BIT)) |
| #define IPMI_KCS_SMS_ATN_MASK (1 << IPMI_KCS_SMS_ATN_BIT) |
| #define IPMI_KCS_GET_SMS_ATN(d) (((d) >> IPMI_KCS_SMS_ATN_BIT) & 0x1) |
| #define IPMI_KCS_SET_SMS_ATN(d, v) (d) = (((d) & ~IPMI_KCS_SMS_ATN_MASK) | \ |
| (((v) & 1) << IPMI_KCS_SMS_ATN_BIT)) |
| #define IPMI_KCS_CD_MASK (1 << IPMI_KCS_CD_BIT) |
| #define IPMI_KCS_GET_CD(d) (((d) >> IPMI_KCS_CD_BIT) & 0x1) |
| #define IPMI_KCS_SET_CD(d, v) (d) = (((d) & ~IPMI_KCS_CD_MASK) | \ |
| (((v) & 1) << IPMI_KCS_CD_BIT)) |
| |
| #define IPMI_KCS_IDLE_STATE 0 |
| #define IPMI_KCS_READ_STATE 1 |
| #define IPMI_KCS_WRITE_STATE 2 |
| #define IPMI_KCS_ERROR_STATE 3 |
| |
| #define IPMI_KCS_GET_STATE(d) (((d) >> 6) & 0x3) |
| #define IPMI_KCS_SET_STATE(d, v) ((d) = ((d) & ~0xc0) | (((v) & 0x3) << 6)) |
| |
| #define IPMI_KCS_ABORT_STATUS_CMD 0x60 |
| #define IPMI_KCS_WRITE_START_CMD 0x61 |
| #define IPMI_KCS_WRITE_END_CMD 0x62 |
| #define IPMI_KCS_READ_CMD 0x68 |
| |
| #define IPMI_KCS_STATUS_NO_ERR 0x00 |
| #define IPMI_KCS_STATUS_ABORTED_ERR 0x01 |
| #define IPMI_KCS_STATUS_BAD_CC_ERR 0x02 |
| #define IPMI_KCS_STATUS_LENGTH_ERR 0x06 |
| |
| static void ipmi_kcs_raise_irq(IPMIKCS *ik) |
| { |
| if (ik->use_irq && ik->irqs_enabled && ik->raise_irq) { |
| ik->raise_irq(ik); |
| } |
| } |
| |
| static void ipmi_kcs_lower_irq(IPMIKCS *ik) |
| { |
| if (ik->lower_irq) { |
| ik->lower_irq(ik); |
| } |
| } |
| |
| #define SET_OBF() \ |
| do { \ |
| IPMI_KCS_SET_OBF(ik->status_reg, 1); \ |
| if (!ik->obf_irq_set) { \ |
| ik->obf_irq_set = 1; \ |
| if (!ik->atn_irq_set) { \ |
| ipmi_kcs_raise_irq(ik); \ |
| } \ |
| } \ |
| } while (0) |
| |
| static void ipmi_kcs_signal(IPMIKCS *ik, IPMIInterface *ii) |
| { |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| |
| ik->do_wake = 1; |
| while (ik->do_wake) { |
| ik->do_wake = 0; |
| iic->handle_if_event(ii); |
| } |
| } |
| |
| static void ipmi_kcs_handle_event(IPMIInterface *ii) |
| { |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| IPMIKCS *ik = iic->get_backend_data(ii); |
| |
| if (ik->cmd_reg == IPMI_KCS_ABORT_STATUS_CMD) { |
| if (IPMI_KCS_GET_STATE(ik->status_reg) != IPMI_KCS_ERROR_STATE) { |
| ik->waiting_rsp++; /* Invalidate the message */ |
| ik->outmsg[0] = IPMI_KCS_STATUS_ABORTED_ERR; |
| ik->outlen = 1; |
| ik->outpos = 0; |
| IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_ERROR_STATE); |
| SET_OBF(); |
| } |
| goto out; |
| } |
| |
| switch (IPMI_KCS_GET_STATE(ik->status_reg)) { |
| case IPMI_KCS_IDLE_STATE: |
| if (ik->cmd_reg == IPMI_KCS_WRITE_START_CMD) { |
| IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_WRITE_STATE); |
| ik->cmd_reg = -1; |
| ik->write_end = 0; |
| ik->inlen = 0; |
| SET_OBF(); |
| } |
| break; |
| |
| case IPMI_KCS_READ_STATE: |
| handle_read: |
| if (ik->outpos >= ik->outlen) { |
| IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_IDLE_STATE); |
| SET_OBF(); |
| } else if (ik->data_in_reg == IPMI_KCS_READ_CMD) { |
| ik->data_out_reg = ik->outmsg[ik->outpos]; |
| ik->outpos++; |
| SET_OBF(); |
| } else { |
| ik->outmsg[0] = IPMI_KCS_STATUS_BAD_CC_ERR; |
| ik->outlen = 1; |
| ik->outpos = 0; |
| IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_ERROR_STATE); |
| SET_OBF(); |
| goto out; |
| } |
| break; |
| |
| case IPMI_KCS_WRITE_STATE: |
| if (ik->data_in_reg != -1) { |
| /* |
| * Don't worry about input overrun here, that will be |
| * handled in the BMC. |
| */ |
| if (ik->inlen < sizeof(ik->inmsg)) { |
| ik->inmsg[ik->inlen] = ik->data_in_reg; |
| } |
| ik->inlen++; |
| } |
| if (ik->write_end) { |
| IPMIBmcClass *bk = IPMI_BMC_GET_CLASS(ik->bmc); |
| ik->outlen = 0; |
| ik->write_end = 0; |
| ik->outpos = 0; |
| bk->handle_command(ik->bmc, ik->inmsg, ik->inlen, sizeof(ik->inmsg), |
| ik->waiting_rsp); |
| goto out_noibf; |
| } else if (ik->cmd_reg == IPMI_KCS_WRITE_END_CMD) { |
| ik->cmd_reg = -1; |
| ik->write_end = 1; |
| } |
| SET_OBF(); |
| break; |
| |
| case IPMI_KCS_ERROR_STATE: |
| if (ik->data_in_reg != -1) { |
| IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_READ_STATE); |
| ik->data_in_reg = IPMI_KCS_READ_CMD; |
| goto handle_read; |
| } |
| break; |
| } |
| |
| if (ik->cmd_reg != -1) { |
| /* Got an invalid command */ |
| ik->outmsg[0] = IPMI_KCS_STATUS_BAD_CC_ERR; |
| ik->outlen = 1; |
| ik->outpos = 0; |
| IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_ERROR_STATE); |
| } |
| |
| out: |
| ik->cmd_reg = -1; |
| ik->data_in_reg = -1; |
| IPMI_KCS_SET_IBF(ik->status_reg, 0); |
| out_noibf: |
| return; |
| } |
| |
| static void ipmi_kcs_handle_rsp(IPMIInterface *ii, uint8_t msg_id, |
| unsigned char *rsp, unsigned int rsp_len) |
| { |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| IPMIKCS *ik = iic->get_backend_data(ii); |
| |
| if (ik->waiting_rsp == msg_id) { |
| ik->waiting_rsp++; |
| if (rsp_len > sizeof(ik->outmsg)) { |
| ik->outmsg[0] = rsp[0]; |
| ik->outmsg[1] = rsp[1]; |
| ik->outmsg[2] = IPMI_CC_CANNOT_RETURN_REQ_NUM_BYTES; |
| ik->outlen = 3; |
| } else { |
| memcpy(ik->outmsg, rsp, rsp_len); |
| ik->outlen = rsp_len; |
| } |
| IPMI_KCS_SET_STATE(ik->status_reg, IPMI_KCS_READ_STATE); |
| ik->data_in_reg = IPMI_KCS_READ_CMD; |
| ipmi_kcs_signal(ik, ii); |
| } |
| } |
| |
| |
| static uint64_t ipmi_kcs_ioport_read(void *opaque, hwaddr addr, unsigned size) |
| { |
| IPMIInterface *ii = opaque; |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| IPMIKCS *ik = iic->get_backend_data(ii); |
| uint32_t ret; |
| |
| switch (addr & ik->size_mask) { |
| case 0: |
| ret = ik->data_out_reg; |
| IPMI_KCS_SET_OBF(ik->status_reg, 0); |
| if (ik->obf_irq_set) { |
| ik->obf_irq_set = 0; |
| if (!ik->atn_irq_set) { |
| ipmi_kcs_lower_irq(ik); |
| } |
| } |
| break; |
| |
| case 1: |
| ret = ik->status_reg; |
| if (ik->atn_irq_set) { |
| ik->atn_irq_set = 0; |
| if (!ik->obf_irq_set) { |
| ipmi_kcs_lower_irq(ik); |
| } |
| } |
| break; |
| |
| default: |
| ret = 0xff; |
| } |
| return ret; |
| } |
| |
| static void ipmi_kcs_ioport_write(void *opaque, hwaddr addr, uint64_t val, |
| unsigned size) |
| { |
| IPMIInterface *ii = opaque; |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| IPMIKCS *ik = iic->get_backend_data(ii); |
| |
| if (IPMI_KCS_GET_IBF(ik->status_reg)) { |
| return; |
| } |
| |
| switch (addr & ik->size_mask) { |
| case 0: |
| ik->data_in_reg = val; |
| break; |
| |
| case 1: |
| ik->cmd_reg = val; |
| break; |
| |
| default: |
| /* Ignore. */ |
| break; |
| } |
| IPMI_KCS_SET_IBF(ik->status_reg, 1); |
| ipmi_kcs_signal(ik, ii); |
| } |
| |
| const MemoryRegionOps ipmi_kcs_io_ops = { |
| .read = ipmi_kcs_ioport_read, |
| .write = ipmi_kcs_ioport_write, |
| .impl = { |
| .min_access_size = 1, |
| .max_access_size = 1, |
| }, |
| .endianness = DEVICE_LITTLE_ENDIAN, |
| }; |
| |
| static void ipmi_kcs_set_atn(IPMIInterface *ii, int val, int irq) |
| { |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| IPMIKCS *ik = iic->get_backend_data(ii); |
| |
| IPMI_KCS_SET_SMS_ATN(ik->status_reg, val); |
| if (val) { |
| if (irq && !ik->atn_irq_set) { |
| ik->atn_irq_set = 1; |
| if (!ik->obf_irq_set) { |
| ipmi_kcs_raise_irq(ik); |
| } |
| } |
| } else { |
| if (ik->atn_irq_set) { |
| ik->atn_irq_set = 0; |
| if (!ik->obf_irq_set) { |
| ipmi_kcs_lower_irq(ik); |
| } |
| } |
| } |
| } |
| |
| static void ipmi_kcs_set_irq_enable(IPMIInterface *ii, int val) |
| { |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| IPMIKCS *ik = iic->get_backend_data(ii); |
| |
| ik->irqs_enabled = val; |
| } |
| |
| /* min_size must be a power of 2. */ |
| static void ipmi_kcs_init(IPMIInterface *ii, unsigned int min_size, |
| Error **errp) |
| { |
| IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii); |
| IPMIKCS *ik = iic->get_backend_data(ii); |
| |
| if (min_size == 0) { |
| min_size = 2; |
| } |
| ik->size_mask = min_size - 1; |
| ik->io_length = 2; |
| memory_region_init_io(&ik->io, NULL, &ipmi_kcs_io_ops, ii, "ipmi-kcs", |
| min_size); |
| } |
| |
| int ipmi_kcs_vmstate_post_load(void *opaque, int version) |
| { |
| IPMIKCS *ik = opaque; |
| |
| /* Make sure all the values are sane. */ |
| if (ik->outpos >= MAX_IPMI_MSG_SIZE || ik->outlen >= MAX_IPMI_MSG_SIZE || |
| ik->outpos >= ik->outlen) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "ipmi:kcs: vmstate transfer received bad out values: %d %d\n", |
| ik->outpos, ik->outlen); |
| ik->outpos = 0; |
| ik->outlen = 0; |
| } |
| |
| if (ik->inlen >= MAX_IPMI_MSG_SIZE) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "ipmi:kcs: vmstate transfer received bad in value: %d\n", |
| ik->inlen); |
| ik->inlen = 0; |
| } |
| |
| return 0; |
| } |
| |
| static bool vmstate_kcs_before_version2(void *opaque, int version) |
| { |
| return version <= 1; |
| } |
| |
| const VMStateDescription vmstate_IPMIKCS = { |
| .name = TYPE_IPMI_INTERFACE_PREFIX "kcs", |
| .version_id = 2, |
| .minimum_version_id = 1, |
| .post_load = ipmi_kcs_vmstate_post_load, |
| .fields = (const VMStateField[]) { |
| VMSTATE_BOOL(obf_irq_set, IPMIKCS), |
| VMSTATE_BOOL(atn_irq_set, IPMIKCS), |
| VMSTATE_UNUSED_TEST(vmstate_kcs_before_version2, 1), /* Was use_irq */ |
| VMSTATE_BOOL(irqs_enabled, IPMIKCS), |
| VMSTATE_UINT32(outpos, IPMIKCS), |
| VMSTATE_UINT32_V(outlen, IPMIKCS, 2), |
| VMSTATE_UINT8_ARRAY(outmsg, IPMIKCS, MAX_IPMI_MSG_SIZE), |
| VMSTATE_UINT32_V(inlen, IPMIKCS, 2), |
| VMSTATE_UINT8_ARRAY(inmsg, IPMIKCS, MAX_IPMI_MSG_SIZE), |
| VMSTATE_BOOL(write_end, IPMIKCS), |
| VMSTATE_UINT8(status_reg, IPMIKCS), |
| VMSTATE_UINT8(data_out_reg, IPMIKCS), |
| VMSTATE_INT16(data_in_reg, IPMIKCS), |
| VMSTATE_INT16(cmd_reg, IPMIKCS), |
| VMSTATE_UINT8(waiting_rsp, IPMIKCS), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| void ipmi_kcs_get_fwinfo(IPMIKCS *ik, IPMIFwInfo *info) |
| { |
| info->interface_name = "kcs"; |
| info->interface_type = IPMI_SMBIOS_KCS; |
| info->ipmi_spec_major_revision = 2; |
| info->ipmi_spec_minor_revision = 0; |
| info->base_address = ik->io_base; |
| info->i2c_slave_address = ik->bmc->slave_addr; |
| info->register_length = ik->io_length; |
| info->register_spacing = 1; |
| info->memspace = IPMI_MEMSPACE_IO; |
| info->irq_type = IPMI_LEVEL_IRQ; |
| } |
| |
| void ipmi_kcs_class_init(IPMIInterfaceClass *iic) |
| { |
| iic->init = ipmi_kcs_init; |
| iic->set_atn = ipmi_kcs_set_atn; |
| iic->handle_rsp = ipmi_kcs_handle_rsp; |
| iic->handle_if_event = ipmi_kcs_handle_event; |
| iic->set_irq_enable = ipmi_kcs_set_irq_enable; |
| } |
