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ipmi: add a KCS IPMI BMC driver
Provides a device driver for the KCS (Keyboard Controller Style) IPMI interface which meets the requirement of the BMC (Baseboard Management Controllers) side for handling the IPMI request from host system software. Signed-off-by: Haiyue Wang <haiyue.wang@linux.intel.com> [Removed the selectability of IPMI_KCS_BMC, as it doesn't do much good to have it by itself.] Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Haiyue Wang
Corey Minyard
parent
e1171aca7d
commit
20d60f61c5
@ -96,6 +96,9 @@ config IPMI_POWEROFF
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endif # IPMI_HANDLER
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config IPMI_KCS_BMC
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tristate
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config ASPEED_BT_IPMI_BMC
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depends on ARCH_ASPEED || COMPILE_TEST
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depends on REGMAP && REGMAP_MMIO && MFD_SYSCON
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@ -21,4 +21,5 @@ obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o
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obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
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obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o
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obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o
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obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o
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obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
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464
drivers/char/ipmi/kcs_bmc.c
Normal file
464
drivers/char/ipmi/kcs_bmc.c
Normal file
@ -0,0 +1,464 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2015-2018, Intel Corporation.
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#define pr_fmt(fmt) "kcs-bmc: " fmt
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/ipmi_bmc.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "kcs_bmc.h"
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#define KCS_MSG_BUFSIZ 1000
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#define KCS_ZERO_DATA 0
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/* IPMI 2.0 - Table 9-1, KCS Interface Status Register Bits */
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#define KCS_STATUS_STATE(state) (state << 6)
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#define KCS_STATUS_STATE_MASK GENMASK(7, 6)
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#define KCS_STATUS_CMD_DAT BIT(3)
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#define KCS_STATUS_SMS_ATN BIT(2)
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#define KCS_STATUS_IBF BIT(1)
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#define KCS_STATUS_OBF BIT(0)
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/* IPMI 2.0 - Table 9-2, KCS Interface State Bits */
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enum kcs_states {
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IDLE_STATE = 0,
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READ_STATE = 1,
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WRITE_STATE = 2,
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ERROR_STATE = 3,
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};
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/* IPMI 2.0 - Table 9-3, KCS Interface Control Codes */
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#define KCS_CMD_GET_STATUS_ABORT 0x60
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#define KCS_CMD_WRITE_START 0x61
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#define KCS_CMD_WRITE_END 0x62
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#define KCS_CMD_READ_BYTE 0x68
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static inline u8 read_data(struct kcs_bmc *kcs_bmc)
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{
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return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.idr);
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}
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static inline void write_data(struct kcs_bmc *kcs_bmc, u8 data)
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{
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kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.odr, data);
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}
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static inline u8 read_status(struct kcs_bmc *kcs_bmc)
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{
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return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.str);
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}
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static inline void write_status(struct kcs_bmc *kcs_bmc, u8 data)
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{
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kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.str, data);
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}
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static void update_status_bits(struct kcs_bmc *kcs_bmc, u8 mask, u8 val)
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{
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u8 tmp = read_status(kcs_bmc);
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tmp &= ~mask;
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tmp |= val & mask;
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write_status(kcs_bmc, tmp);
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}
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static inline void set_state(struct kcs_bmc *kcs_bmc, u8 state)
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{
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update_status_bits(kcs_bmc, KCS_STATUS_STATE_MASK,
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KCS_STATUS_STATE(state));
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}
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static void kcs_force_abort(struct kcs_bmc *kcs_bmc)
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{
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set_state(kcs_bmc, ERROR_STATE);
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read_data(kcs_bmc);
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write_data(kcs_bmc, KCS_ZERO_DATA);
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kcs_bmc->phase = KCS_PHASE_ERROR;
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kcs_bmc->data_in_avail = false;
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kcs_bmc->data_in_idx = 0;
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}
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static void kcs_bmc_handle_data(struct kcs_bmc *kcs_bmc)
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{
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u8 data;
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switch (kcs_bmc->phase) {
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case KCS_PHASE_WRITE_START:
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kcs_bmc->phase = KCS_PHASE_WRITE_DATA;
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case KCS_PHASE_WRITE_DATA:
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if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) {
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set_state(kcs_bmc, WRITE_STATE);
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write_data(kcs_bmc, KCS_ZERO_DATA);
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kcs_bmc->data_in[kcs_bmc->data_in_idx++] =
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read_data(kcs_bmc);
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} else {
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kcs_force_abort(kcs_bmc);
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kcs_bmc->error = KCS_LENGTH_ERROR;
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}
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break;
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case KCS_PHASE_WRITE_END_CMD:
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if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) {
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set_state(kcs_bmc, READ_STATE);
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kcs_bmc->data_in[kcs_bmc->data_in_idx++] =
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read_data(kcs_bmc);
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kcs_bmc->phase = KCS_PHASE_WRITE_DONE;
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kcs_bmc->data_in_avail = true;
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wake_up_interruptible(&kcs_bmc->queue);
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} else {
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kcs_force_abort(kcs_bmc);
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kcs_bmc->error = KCS_LENGTH_ERROR;
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}
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break;
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case KCS_PHASE_READ:
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if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len)
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set_state(kcs_bmc, IDLE_STATE);
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data = read_data(kcs_bmc);
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if (data != KCS_CMD_READ_BYTE) {
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set_state(kcs_bmc, ERROR_STATE);
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write_data(kcs_bmc, KCS_ZERO_DATA);
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break;
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}
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if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len) {
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write_data(kcs_bmc, KCS_ZERO_DATA);
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kcs_bmc->phase = KCS_PHASE_IDLE;
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break;
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}
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write_data(kcs_bmc,
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kcs_bmc->data_out[kcs_bmc->data_out_idx++]);
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break;
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case KCS_PHASE_ABORT_ERROR1:
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set_state(kcs_bmc, READ_STATE);
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read_data(kcs_bmc);
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write_data(kcs_bmc, kcs_bmc->error);
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kcs_bmc->phase = KCS_PHASE_ABORT_ERROR2;
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break;
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case KCS_PHASE_ABORT_ERROR2:
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set_state(kcs_bmc, IDLE_STATE);
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read_data(kcs_bmc);
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write_data(kcs_bmc, KCS_ZERO_DATA);
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kcs_bmc->phase = KCS_PHASE_IDLE;
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break;
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default:
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kcs_force_abort(kcs_bmc);
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break;
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}
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}
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static void kcs_bmc_handle_cmd(struct kcs_bmc *kcs_bmc)
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{
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u8 cmd;
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set_state(kcs_bmc, WRITE_STATE);
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write_data(kcs_bmc, KCS_ZERO_DATA);
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cmd = read_data(kcs_bmc);
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switch (cmd) {
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case KCS_CMD_WRITE_START:
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kcs_bmc->phase = KCS_PHASE_WRITE_START;
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kcs_bmc->error = KCS_NO_ERROR;
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kcs_bmc->data_in_avail = false;
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kcs_bmc->data_in_idx = 0;
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break;
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case KCS_CMD_WRITE_END:
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if (kcs_bmc->phase != KCS_PHASE_WRITE_DATA) {
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kcs_force_abort(kcs_bmc);
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break;
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}
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kcs_bmc->phase = KCS_PHASE_WRITE_END_CMD;
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break;
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case KCS_CMD_GET_STATUS_ABORT:
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if (kcs_bmc->error == KCS_NO_ERROR)
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kcs_bmc->error = KCS_ABORTED_BY_COMMAND;
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kcs_bmc->phase = KCS_PHASE_ABORT_ERROR1;
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kcs_bmc->data_in_avail = false;
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kcs_bmc->data_in_idx = 0;
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break;
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default:
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kcs_force_abort(kcs_bmc);
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kcs_bmc->error = KCS_ILLEGAL_CONTROL_CODE;
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break;
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}
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}
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int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc)
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{
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unsigned long flags;
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int ret = 0;
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u8 status;
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spin_lock_irqsave(&kcs_bmc->lock, flags);
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if (!kcs_bmc->running) {
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kcs_force_abort(kcs_bmc);
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ret = -ENODEV;
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goto out_unlock;
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}
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status = read_status(kcs_bmc) & (KCS_STATUS_IBF | KCS_STATUS_CMD_DAT);
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switch (status) {
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case KCS_STATUS_IBF | KCS_STATUS_CMD_DAT:
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kcs_bmc_handle_cmd(kcs_bmc);
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break;
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case KCS_STATUS_IBF:
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kcs_bmc_handle_data(kcs_bmc);
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break;
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default:
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ret = -ENODATA;
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break;
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}
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out_unlock:
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spin_unlock_irqrestore(&kcs_bmc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(kcs_bmc_handle_event);
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static inline struct kcs_bmc *file_to_kcs_bmc(struct file *filp)
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{
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return container_of(filp->private_data, struct kcs_bmc, miscdev);
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}
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static int kcs_bmc_open(struct inode *inode, struct file *filp)
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{
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struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);
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int ret = 0;
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spin_lock_irq(&kcs_bmc->lock);
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if (!kcs_bmc->running)
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kcs_bmc->running = 1;
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else
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ret = -EBUSY;
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spin_unlock_irq(&kcs_bmc->lock);
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return ret;
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}
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static unsigned int kcs_bmc_poll(struct file *filp, poll_table *wait)
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{
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struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);
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unsigned int mask = 0;
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poll_wait(filp, &kcs_bmc->queue, wait);
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spin_lock_irq(&kcs_bmc->lock);
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if (kcs_bmc->data_in_avail)
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mask |= POLLIN;
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spin_unlock_irq(&kcs_bmc->lock);
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return mask;
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}
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static ssize_t kcs_bmc_read(struct file *filp, char *buf,
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size_t count, loff_t *offset)
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{
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struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);
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bool data_avail;
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size_t data_len;
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ssize_t ret;
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if (!(filp->f_flags & O_NONBLOCK))
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wait_event_interruptible(kcs_bmc->queue,
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kcs_bmc->data_in_avail);
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mutex_lock(&kcs_bmc->mutex);
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spin_lock_irq(&kcs_bmc->lock);
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data_avail = kcs_bmc->data_in_avail;
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if (data_avail) {
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data_len = kcs_bmc->data_in_idx;
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memcpy(kcs_bmc->kbuffer, kcs_bmc->data_in, data_len);
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}
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spin_unlock_irq(&kcs_bmc->lock);
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if (!data_avail) {
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ret = -EAGAIN;
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goto out_unlock;
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}
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if (count < data_len) {
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pr_err("channel=%u with too large data : %zu\n",
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kcs_bmc->channel, data_len);
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spin_lock_irq(&kcs_bmc->lock);
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kcs_force_abort(kcs_bmc);
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spin_unlock_irq(&kcs_bmc->lock);
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ret = -EOVERFLOW;
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goto out_unlock;
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}
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if (copy_to_user(buf, kcs_bmc->kbuffer, data_len)) {
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ret = -EFAULT;
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goto out_unlock;
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}
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ret = data_len;
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spin_lock_irq(&kcs_bmc->lock);
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if (kcs_bmc->phase == KCS_PHASE_WRITE_DONE) {
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kcs_bmc->phase = KCS_PHASE_WAIT_READ;
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kcs_bmc->data_in_avail = false;
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kcs_bmc->data_in_idx = 0;
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} else {
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ret = -EAGAIN;
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}
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spin_unlock_irq(&kcs_bmc->lock);
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out_unlock:
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mutex_unlock(&kcs_bmc->mutex);
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return ret;
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}
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static ssize_t kcs_bmc_write(struct file *filp, const char *buf,
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size_t count, loff_t *offset)
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{
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struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);
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ssize_t ret;
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/* a minimum response size '3' : netfn + cmd + ccode */
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if (count < 3 || count > KCS_MSG_BUFSIZ)
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return -EINVAL;
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mutex_lock(&kcs_bmc->mutex);
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if (copy_from_user(kcs_bmc->kbuffer, buf, count)) {
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ret = -EFAULT;
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goto out_unlock;
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}
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spin_lock_irq(&kcs_bmc->lock);
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if (kcs_bmc->phase == KCS_PHASE_WAIT_READ) {
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kcs_bmc->phase = KCS_PHASE_READ;
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kcs_bmc->data_out_idx = 1;
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kcs_bmc->data_out_len = count;
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memcpy(kcs_bmc->data_out, kcs_bmc->kbuffer, count);
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write_data(kcs_bmc, kcs_bmc->data_out[0]);
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ret = count;
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} else {
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ret = -EINVAL;
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}
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spin_unlock_irq(&kcs_bmc->lock);
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out_unlock:
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mutex_unlock(&kcs_bmc->mutex);
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return ret;
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}
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static long kcs_bmc_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);
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long ret = 0;
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spin_lock_irq(&kcs_bmc->lock);
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switch (cmd) {
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case IPMI_BMC_IOCTL_SET_SMS_ATN:
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update_status_bits(kcs_bmc, KCS_STATUS_SMS_ATN,
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KCS_STATUS_SMS_ATN);
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break;
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case IPMI_BMC_IOCTL_CLEAR_SMS_ATN:
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update_status_bits(kcs_bmc, KCS_STATUS_SMS_ATN,
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0);
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break;
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case IPMI_BMC_IOCTL_FORCE_ABORT:
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kcs_force_abort(kcs_bmc);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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spin_unlock_irq(&kcs_bmc->lock);
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return ret;
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}
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static int kcs_bmc_release(struct inode *inode, struct file *filp)
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{
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struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);
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spin_lock_irq(&kcs_bmc->lock);
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kcs_bmc->running = 0;
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kcs_force_abort(kcs_bmc);
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spin_unlock_irq(&kcs_bmc->lock);
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return 0;
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}
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static const struct file_operations kcs_bmc_fops = {
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.owner = THIS_MODULE,
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.open = kcs_bmc_open,
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.read = kcs_bmc_read,
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.write = kcs_bmc_write,
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.release = kcs_bmc_release,
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.poll = kcs_bmc_poll,
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.unlocked_ioctl = kcs_bmc_ioctl,
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};
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struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel)
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{
|
||||
struct kcs_bmc *kcs_bmc;
|
||||
|
||||
kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc) + sizeof_priv, GFP_KERNEL);
|
||||
if (!kcs_bmc)
|
||||
return NULL;
|
||||
|
||||
dev_set_name(dev, "ipmi-kcs%u", channel);
|
||||
|
||||
spin_lock_init(&kcs_bmc->lock);
|
||||
kcs_bmc->channel = channel;
|
||||
|
||||
mutex_init(&kcs_bmc->mutex);
|
||||
init_waitqueue_head(&kcs_bmc->queue);
|
||||
|
||||
kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
|
||||
kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
|
||||
kcs_bmc->kbuffer = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
|
||||
if (!kcs_bmc->data_in || !kcs_bmc->data_out || !kcs_bmc->kbuffer)
|
||||
return NULL;
|
||||
|
||||
kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR;
|
||||
kcs_bmc->miscdev.name = dev_name(dev);
|
||||
kcs_bmc->miscdev.fops = &kcs_bmc_fops;
|
||||
|
||||
return kcs_bmc;
|
||||
}
|
||||
EXPORT_SYMBOL(kcs_bmc_alloc);
|
||||
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>");
|
||||
MODULE_DESCRIPTION("KCS BMC to handle the IPMI request from system software");
|
||||
106
drivers/char/ipmi/kcs_bmc.h
Normal file
106
drivers/char/ipmi/kcs_bmc.h
Normal file
@ -0,0 +1,106 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (c) 2015-2018, Intel Corporation.
|
||||
|
||||
#ifndef __KCS_BMC_H__
|
||||
#define __KCS_BMC_H__
|
||||
|
||||
#include <linux/miscdevice.h>
|
||||
|
||||
/* Different phases of the KCS BMC module :
|
||||
* KCS_PHASE_IDLE :
|
||||
* BMC should not be expecting nor sending any data.
|
||||
* KCS_PHASE_WRITE_START :
|
||||
* BMC is receiving a WRITE_START command from system software.
|
||||
* KCS_PHASE_WRITE_DATA :
|
||||
* BMC is receiving a data byte from system software.
|
||||
* KCS_PHASE_WRITE_END_CMD :
|
||||
* BMC is waiting a last data byte from system software.
|
||||
* KCS_PHASE_WRITE_DONE :
|
||||
* BMC has received the whole request from system software.
|
||||
* KCS_PHASE_WAIT_READ :
|
||||
* BMC is waiting the response from the upper IPMI service.
|
||||
* KCS_PHASE_READ :
|
||||
* BMC is transferring the response to system software.
|
||||
* KCS_PHASE_ABORT_ERROR1 :
|
||||
* BMC is waiting error status request from system software.
|
||||
* KCS_PHASE_ABORT_ERROR2 :
|
||||
* BMC is waiting for idle status afer error from system software.
|
||||
* KCS_PHASE_ERROR :
|
||||
* BMC has detected a protocol violation at the interface level.
|
||||
*/
|
||||
enum kcs_phases {
|
||||
KCS_PHASE_IDLE,
|
||||
|
||||
KCS_PHASE_WRITE_START,
|
||||
KCS_PHASE_WRITE_DATA,
|
||||
KCS_PHASE_WRITE_END_CMD,
|
||||
KCS_PHASE_WRITE_DONE,
|
||||
|
||||
KCS_PHASE_WAIT_READ,
|
||||
KCS_PHASE_READ,
|
||||
|
||||
KCS_PHASE_ABORT_ERROR1,
|
||||
KCS_PHASE_ABORT_ERROR2,
|
||||
KCS_PHASE_ERROR
|
||||
};
|
||||
|
||||
/* IPMI 2.0 - Table 9-4, KCS Interface Status Codes */
|
||||
enum kcs_errors {
|
||||
KCS_NO_ERROR = 0x00,
|
||||
KCS_ABORTED_BY_COMMAND = 0x01,
|
||||
KCS_ILLEGAL_CONTROL_CODE = 0x02,
|
||||
KCS_LENGTH_ERROR = 0x06,
|
||||
KCS_UNSPECIFIED_ERROR = 0xFF
|
||||
};
|
||||
|
||||
/* IPMI 2.0 - 9.5, KCS Interface Registers
|
||||
* @idr : Input Data Register
|
||||
* @odr : Output Data Register
|
||||
* @str : Status Register
|
||||
*/
|
||||
struct kcs_ioreg {
|
||||
u32 idr;
|
||||
u32 odr;
|
||||
u32 str;
|
||||
};
|
||||
|
||||
struct kcs_bmc {
|
||||
spinlock_t lock;
|
||||
|
||||
u32 channel;
|
||||
int running;
|
||||
|
||||
/* Setup by BMC KCS controller driver */
|
||||
struct kcs_ioreg ioreg;
|
||||
u8 (*io_inputb)(struct kcs_bmc *kcs_bmc, u32 reg);
|
||||
void (*io_outputb)(struct kcs_bmc *kcs_bmc, u32 reg, u8 b);
|
||||
|
||||
enum kcs_phases phase;
|
||||
enum kcs_errors error;
|
||||
|
||||
wait_queue_head_t queue;
|
||||
bool data_in_avail;
|
||||
int data_in_idx;
|
||||
u8 *data_in;
|
||||
|
||||
int data_out_idx;
|
||||
int data_out_len;
|
||||
u8 *data_out;
|
||||
|
||||
struct mutex mutex;
|
||||
u8 *kbuffer;
|
||||
|
||||
struct miscdevice miscdev;
|
||||
|
||||
unsigned long priv[];
|
||||
};
|
||||
|
||||
static inline void *kcs_bmc_priv(struct kcs_bmc *kcs_bmc)
|
||||
{
|
||||
return kcs_bmc->priv;
|
||||
}
|
||||
|
||||
int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc);
|
||||
struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv,
|
||||
u32 channel);
|
||||
#endif
|
||||
14
include/uapi/linux/ipmi_bmc.h
Normal file
14
include/uapi/linux/ipmi_bmc.h
Normal file
@ -0,0 +1,14 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (c) 2015-2018, Intel Corporation.
|
||||
|
||||
#ifndef _UAPI_LINUX_IPMI_BMC_H
|
||||
#define _UAPI_LINUX_IPMI_BMC_H
|
||||
|
||||
#include <linux/ioctl.h>
|
||||
|
||||
#define __IPMI_BMC_IOCTL_MAGIC 0xB1
|
||||
#define IPMI_BMC_IOCTL_SET_SMS_ATN _IO(__IPMI_BMC_IOCTL_MAGIC, 0x00)
|
||||
#define IPMI_BMC_IOCTL_CLEAR_SMS_ATN _IO(__IPMI_BMC_IOCTL_MAGIC, 0x01)
|
||||
#define IPMI_BMC_IOCTL_FORCE_ABORT _IO(__IPMI_BMC_IOCTL_MAGIC, 0x02)
|
||||
|
||||
#endif /* _UAPI_LINUX_KCS_BMC_H */
|
||||
Loading…
Reference in New Issue
Block a user