diff options
author | M Chetan Kumar <m.chetan.kumar@intel.com> | 2021-06-13 18:20:19 +0530 |
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committer | David S. Miller <davem@davemloft.net> | 2021-06-13 13:49:38 -0700 |
commit | faed4c6f6f486fbd0bde233dd46beb26ebdb1ab2 (patch) | |
tree | 487edd3b0e230ea58160633143b6cd2efe6b5dac /drivers/net/wwan | |
parent | be8c936e540fe6e60d03fa1578205c936e71335b (diff) | |
download | linux-faed4c6f6f486fbd0bde233dd46beb26ebdb1ab2.tar.bz2 |
net: iosm: shared memory protocol
1) Defines messaging protocol for handling Transfer Descriptor
in both UL/DL direction.
2) Ring buffer management.
Signed-off-by: M Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/wwan')
-rw-r--r-- | drivers/net/wwan/iosm/iosm_ipc_protocol.c | 283 | ||||
-rw-r--r-- | drivers/net/wwan/iosm/iosm_ipc_protocol.h | 237 |
2 files changed, 520 insertions, 0 deletions
diff --git a/drivers/net/wwan/iosm/iosm_ipc_protocol.c b/drivers/net/wwan/iosm/iosm_ipc_protocol.c new file mode 100644 index 000000000000..834d8b146a94 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_protocol.c @@ -0,0 +1,283 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020-21 Intel Corporation. + */ + +#include "iosm_ipc_imem.h" +#include "iosm_ipc_protocol.h" +#include "iosm_ipc_protocol_ops.h" +#include "iosm_ipc_pm.h" +#include "iosm_ipc_task_queue.h" + +int ipc_protocol_tq_msg_send(struct iosm_protocol *ipc_protocol, + enum ipc_msg_prep_type msg_type, + union ipc_msg_prep_args *prep_args, + struct ipc_rsp *response) +{ + int index = ipc_protocol_msg_prep(ipc_protocol->imem, msg_type, + prep_args); + + /* Store reference towards caller specified response in response ring + * and signal CP + */ + if (index >= 0 && index < IPC_MEM_MSG_ENTRIES) { + ipc_protocol->rsp_ring[index] = response; + ipc_protocol_msg_hp_update(ipc_protocol->imem); + } + + return index; +} + +/* Callback for message send */ +static int ipc_protocol_tq_msg_send_cb(struct iosm_imem *ipc_imem, int arg, + void *msg, size_t size) +{ + struct ipc_call_msg_send_args *send_args = msg; + struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol; + + return ipc_protocol_tq_msg_send(ipc_protocol, send_args->msg_type, + send_args->prep_args, + send_args->response); +} + +/* Remove reference to a response. This is typically used when a requestor timed + * out and is no longer interested in the response. + */ +static int ipc_protocol_tq_msg_remove(struct iosm_imem *ipc_imem, int arg, + void *msg, size_t size) +{ + struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol; + + ipc_protocol->rsp_ring[arg] = NULL; + return 0; +} + +int ipc_protocol_msg_send(struct iosm_protocol *ipc_protocol, + enum ipc_msg_prep_type prep, + union ipc_msg_prep_args *prep_args) +{ + struct ipc_call_msg_send_args send_args; + unsigned int exec_timeout; + struct ipc_rsp response; + int index; + + exec_timeout = (ipc_protocol_get_ap_exec_stage(ipc_protocol) == + IPC_MEM_EXEC_STAGE_RUN ? + IPC_MSG_COMPLETE_RUN_DEFAULT_TIMEOUT : + IPC_MSG_COMPLETE_BOOT_DEFAULT_TIMEOUT); + + /* Trap if called from non-preemptible context */ + might_sleep(); + + response.status = IPC_MEM_MSG_CS_INVALID; + init_completion(&response.completion); + + send_args.msg_type = prep; + send_args.prep_args = prep_args; + send_args.response = &response; + + /* Allocate and prepare message to be sent in tasklet context. + * A positive index returned form tasklet_call references the message + * in case it needs to be cancelled when there is a timeout. + */ + index = ipc_task_queue_send_task(ipc_protocol->imem, + ipc_protocol_tq_msg_send_cb, 0, + &send_args, 0, true); + + if (index < 0) { + dev_err(ipc_protocol->dev, "msg %d failed", prep); + return index; + } + + /* Wait for the device to respond to the message */ + switch (wait_for_completion_timeout(&response.completion, + msecs_to_jiffies(exec_timeout))) { + case 0: + /* Timeout, there was no response from the device. + * Remove the reference to the local response completion + * object as we are no longer interested in the response. + */ + ipc_task_queue_send_task(ipc_protocol->imem, + ipc_protocol_tq_msg_remove, index, + NULL, 0, true); + dev_err(ipc_protocol->dev, "msg timeout"); + ipc_uevent_send(ipc_protocol->pcie->dev, UEVENT_MDM_TIMEOUT); + break; + default: + /* We got a response in time; check completion status: */ + if (response.status != IPC_MEM_MSG_CS_SUCCESS) { + dev_err(ipc_protocol->dev, + "msg completion status error %d", + response.status); + return -EIO; + } + } + + return 0; +} + +static int ipc_protocol_msg_send_host_sleep(struct iosm_protocol *ipc_protocol, + u32 state) +{ + union ipc_msg_prep_args prep_args = { + .sleep.target = 0, + .sleep.state = state, + }; + + return ipc_protocol_msg_send(ipc_protocol, IPC_MSG_PREP_SLEEP, + &prep_args); +} + +void ipc_protocol_doorbell_trigger(struct iosm_protocol *ipc_protocol, + u32 identifier) +{ + ipc_pm_signal_hpda_doorbell(&ipc_protocol->pm, identifier, true); +} + +bool ipc_protocol_pm_dev_sleep_handle(struct iosm_protocol *ipc_protocol) +{ + u32 ipc_status = ipc_protocol_get_ipc_status(ipc_protocol); + u32 requested; + + if (ipc_status != IPC_MEM_DEVICE_IPC_RUNNING) { + dev_err(ipc_protocol->dev, + "irq ignored, CP IPC state is %d, should be RUNNING", + ipc_status); + + /* Stop further processing. */ + return false; + } + + /* Get a copy of the requested PM state by the device and the local + * device PM state. + */ + requested = ipc_protocol_pm_dev_get_sleep_notification(ipc_protocol); + + return ipc_pm_dev_slp_notification(&ipc_protocol->pm, requested); +} + +static int ipc_protocol_tq_wakeup_dev_slp(struct iosm_imem *ipc_imem, int arg, + void *msg, size_t size) +{ + struct iosm_pm *ipc_pm = &ipc_imem->ipc_protocol->pm; + + /* Wakeup from device sleep if it is not ACTIVE */ + ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_HS, true); + + ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_HS, false); + + return 0; +} + +void ipc_protocol_s2idle_sleep(struct iosm_protocol *ipc_protocol, bool sleep) +{ + ipc_pm_set_s2idle_sleep(&ipc_protocol->pm, sleep); +} + +bool ipc_protocol_suspend(struct iosm_protocol *ipc_protocol) +{ + if (!ipc_pm_prepare_host_sleep(&ipc_protocol->pm)) + goto err; + + ipc_task_queue_send_task(ipc_protocol->imem, + ipc_protocol_tq_wakeup_dev_slp, 0, NULL, 0, + true); + + if (!ipc_pm_wait_for_device_active(&ipc_protocol->pm)) { + ipc_uevent_send(ipc_protocol->pcie->dev, UEVENT_MDM_TIMEOUT); + goto err; + } + + /* Send the sleep message for sync sys calls. */ + dev_dbg(ipc_protocol->dev, "send TARGET_HOST, ENTER_SLEEP"); + if (ipc_protocol_msg_send_host_sleep(ipc_protocol, + IPC_HOST_SLEEP_ENTER_SLEEP)) { + /* Sending ENTER_SLEEP message failed, we are still active */ + ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_ACTIVE; + goto err; + } + + ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_SLEEP; + return true; +err: + return false; +} + +bool ipc_protocol_resume(struct iosm_protocol *ipc_protocol) +{ + if (!ipc_pm_prepare_host_active(&ipc_protocol->pm)) + return false; + + dev_dbg(ipc_protocol->dev, "send TARGET_HOST, EXIT_SLEEP"); + if (ipc_protocol_msg_send_host_sleep(ipc_protocol, + IPC_HOST_SLEEP_EXIT_SLEEP)) { + ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_SLEEP; + return false; + } + + ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_ACTIVE; + + return true; +} + +struct iosm_protocol *ipc_protocol_init(struct iosm_imem *ipc_imem) +{ + struct iosm_protocol *ipc_protocol = + kzalloc(sizeof(*ipc_protocol), GFP_KERNEL); + struct ipc_protocol_context_info *p_ci; + u64 addr; + + if (!ipc_protocol) + return NULL; + + ipc_protocol->dev = ipc_imem->dev; + ipc_protocol->pcie = ipc_imem->pcie; + ipc_protocol->imem = ipc_imem; + ipc_protocol->p_ap_shm = NULL; + ipc_protocol->phy_ap_shm = 0; + + ipc_protocol->old_msg_tail = 0; + + ipc_protocol->p_ap_shm = + pci_alloc_consistent(ipc_protocol->pcie->pci, + sizeof(*ipc_protocol->p_ap_shm), + &ipc_protocol->phy_ap_shm); + + if (!ipc_protocol->p_ap_shm) { + dev_err(ipc_protocol->dev, "pci shm alloc error"); + kfree(ipc_protocol); + return NULL; + } + + /* Prepare the context info for CP. */ + addr = ipc_protocol->phy_ap_shm; + p_ci = &ipc_protocol->p_ap_shm->ci; + p_ci->device_info_addr = + addr + offsetof(struct ipc_protocol_ap_shm, device_info); + p_ci->head_array = + addr + offsetof(struct ipc_protocol_ap_shm, head_array); + p_ci->tail_array = + addr + offsetof(struct ipc_protocol_ap_shm, tail_array); + p_ci->msg_head = addr + offsetof(struct ipc_protocol_ap_shm, msg_head); + p_ci->msg_tail = addr + offsetof(struct ipc_protocol_ap_shm, msg_tail); + p_ci->msg_ring_addr = + addr + offsetof(struct ipc_protocol_ap_shm, msg_ring); + p_ci->msg_ring_entries = cpu_to_le16(IPC_MEM_MSG_ENTRIES); + p_ci->msg_irq_vector = IPC_MSG_IRQ_VECTOR; + p_ci->device_info_irq_vector = IPC_DEVICE_IRQ_VECTOR; + + ipc_mmio_set_contex_info_addr(ipc_imem->mmio, addr); + + ipc_pm_init(ipc_protocol); + + return ipc_protocol; +} + +void ipc_protocol_deinit(struct iosm_protocol *proto) +{ + pci_free_consistent(proto->pcie->pci, sizeof(*proto->p_ap_shm), + proto->p_ap_shm, proto->phy_ap_shm); + + ipc_pm_deinit(proto); + kfree(proto); +} diff --git a/drivers/net/wwan/iosm/iosm_ipc_protocol.h b/drivers/net/wwan/iosm/iosm_ipc_protocol.h new file mode 100644 index 000000000000..9b3a6d86ece7 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_protocol.h @@ -0,0 +1,237 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Copyright (C) 2020-21 Intel Corporation. + */ + +#ifndef IOSM_IPC_PROTOCOL_H +#define IOSM_IPC_PROTOCOL_H + +#include "iosm_ipc_imem.h" +#include "iosm_ipc_pm.h" +#include "iosm_ipc_protocol_ops.h" + +/* Trigger the doorbell interrupt on CP. */ +#define IPC_DOORBELL_IRQ_HPDA 0 +#define IPC_DOORBELL_IRQ_IPC 1 +#define IPC_DOORBELL_IRQ_SLEEP 2 + +/* IRQ vector number. */ +#define IPC_DEVICE_IRQ_VECTOR 0 +#define IPC_MSG_IRQ_VECTOR 0 +#define IPC_UL_PIPE_IRQ_VECTOR 0 +#define IPC_DL_PIPE_IRQ_VECTOR 0 + +#define IPC_MEM_MSG_ENTRIES 128 + +/* Default time out for sending IPC messages like open pipe, close pipe etc. + * during run mode. + * + * If the message interface lock to CP times out, the link to CP is broken. + * mode : run mode (IPC_MEM_EXEC_STAGE_RUN) + * unit : milliseconds + */ +#define IPC_MSG_COMPLETE_RUN_DEFAULT_TIMEOUT 500 /* 0.5 seconds */ + +/* Default time out for sending IPC messages like open pipe, close pipe etc. + * during boot mode. + * + * If the message interface lock to CP times out, the link to CP is broken. + * mode : boot mode + * (IPC_MEM_EXEC_STAGE_BOOT | IPC_MEM_EXEC_STAGE_PSI | IPC_MEM_EXEC_STAGE_EBL) + * unit : milliseconds + */ +#define IPC_MSG_COMPLETE_BOOT_DEFAULT_TIMEOUT 500 /* 0.5 seconds */ + +/** + * struct ipc_protocol_context_info - Structure of the context info + * @device_info_addr: 64 bit address to device info + * @head_array: 64 bit address to head pointer arr for the pipes + * @tail_array: 64 bit address to tail pointer arr for the pipes + * @msg_head: 64 bit address to message head pointer + * @msg_tail: 64 bit address to message tail pointer + * @msg_ring_addr: 64 bit pointer to the message ring buffer + * @msg_ring_entries: This field provides the number of entries which + * the MR can hold + * @msg_irq_vector: This field provides the IRQ which shall be + * generated by the EP device when generating + * completion for Messages. + * @device_info_irq_vector: This field provides the IRQ which shall be + * generated by the EP dev after updating Dev. Info + */ +struct ipc_protocol_context_info { + phys_addr_t device_info_addr; + phys_addr_t head_array; + phys_addr_t tail_array; + phys_addr_t msg_head; + phys_addr_t msg_tail; + phys_addr_t msg_ring_addr; + __le16 msg_ring_entries; + u8 msg_irq_vector; + u8 device_info_irq_vector; +}; + +/** + * struct ipc_protocol_device_info - Structure for the device information + * @execution_stage: CP execution stage + * @ipc_status: IPC states + * @device_sleep_notification: Requested device pm states + */ +struct ipc_protocol_device_info { + __le32 execution_stage; + __le32 ipc_status; + __le32 device_sleep_notification; +}; + +/** + * struct ipc_protocol_ap_shm - Protocol Shared Memory Structure + * @ci: Context information struct + * @device_info: Device information struct + * @msg_head: Point to msg head + * @head_array: Array of head pointer + * @msg_tail: Point to msg tail + * @tail_array: Array of tail pointer + * @msg_ring: Circular buffers for the read/tail and write/head + * indeces. + */ +struct ipc_protocol_ap_shm { + struct ipc_protocol_context_info ci; + struct ipc_protocol_device_info device_info; + __le32 msg_head; + __le32 head_array[IPC_MEM_MAX_PIPES]; + __le32 msg_tail; + __le32 tail_array[IPC_MEM_MAX_PIPES]; + union ipc_mem_msg_entry msg_ring[IPC_MEM_MSG_ENTRIES]; +}; + +/** + * struct iosm_protocol - Structure for IPC protocol. + * @p_ap_shm: Pointer to Protocol Shared Memory Structure + * @pm: Instance to struct iosm_pm + * @pcie: Pointer to struct iosm_pcie + * @imem: Pointer to struct iosm_imem + * @rsp_ring: Array of OS completion objects to be triggered once CP + * acknowledges a request in the message ring + * @dev: Pointer to device structure + * @phy_ap_shm: Physical/Mapped representation of the shared memory info + * @old_msg_tail: Old msg tail ptr, until AP has handled ACK's from CP + */ +struct iosm_protocol { + struct ipc_protocol_ap_shm *p_ap_shm; + struct iosm_pm pm; + struct iosm_pcie *pcie; + struct iosm_imem *imem; + struct ipc_rsp *rsp_ring[IPC_MEM_MSG_ENTRIES]; + struct device *dev; + phys_addr_t phy_ap_shm; + u32 old_msg_tail; +}; + +/** + * struct ipc_call_msg_send_args - Structure for message argument for + * tasklet function. + * @prep_args: Arguments for message preparation function + * @response: Can be NULL if result can be ignored + * @msg_type: Message Type + */ +struct ipc_call_msg_send_args { + union ipc_msg_prep_args *prep_args; + struct ipc_rsp *response; + enum ipc_msg_prep_type msg_type; +}; + +/** + * ipc_protocol_tq_msg_send - prepare the msg and send to CP + * @ipc_protocol: Pointer to ipc_protocol instance + * @msg_type: Message type + * @prep_args: Message arguments + * @response: Pointer to a response object which has a + * completion object and return code. + * + * Returns: 0 on success and failure value on error + */ +int ipc_protocol_tq_msg_send(struct iosm_protocol *ipc_protocol, + enum ipc_msg_prep_type msg_type, + union ipc_msg_prep_args *prep_args, + struct ipc_rsp *response); + +/** + * ipc_protocol_msg_send - Send ipc control message to CP and wait for response + * @ipc_protocol: Pointer to ipc_protocol instance + * @prep: Message type + * @prep_args: Message arguments + * + * Returns: 0 on success and failure value on error + */ +int ipc_protocol_msg_send(struct iosm_protocol *ipc_protocol, + enum ipc_msg_prep_type prep, + union ipc_msg_prep_args *prep_args); + +/** + * ipc_protocol_suspend - Signal to CP that host wants to go to sleep (suspend). + * @ipc_protocol: Pointer to ipc_protocol instance + * + * Returns: true if host can suspend, false if suspend must be aborted. + */ +bool ipc_protocol_suspend(struct iosm_protocol *ipc_protocol); + +/** + * ipc_protocol_s2idle_sleep - Call PM function to set PM variables in s2idle + * sleep/active case + * @ipc_protocol: Pointer to ipc_protocol instance + * @sleep: True for sleep/False for active + */ +void ipc_protocol_s2idle_sleep(struct iosm_protocol *ipc_protocol, bool sleep); + +/** + * ipc_protocol_resume - Signal to CP that host wants to resume operation. + * @ipc_protocol: Pointer to ipc_protocol instance + * + * Returns: true if host can resume, false if there is a problem. + */ +bool ipc_protocol_resume(struct iosm_protocol *ipc_protocol); + +/** + * ipc_protocol_pm_dev_sleep_handle - Handles the Device Sleep state change + * notification. + * @ipc_protocol: Pointer to ipc_protocol instance. + * + * Returns: true if sleep notification handled, false otherwise. + */ +bool ipc_protocol_pm_dev_sleep_handle(struct iosm_protocol *ipc_protocol); + +/** + * ipc_protocol_doorbell_trigger - Wrapper for PM function which wake up the + * device if it is in low power mode + * and trigger a head pointer update interrupt. + * @ipc_protocol: Pointer to ipc_protocol instance. + * @identifier: Specifies what component triggered hpda + * update irq + */ +void ipc_protocol_doorbell_trigger(struct iosm_protocol *ipc_protocol, + u32 identifier); + +/** + * ipc_protocol_sleep_notification_string - Returns last Sleep Notification as + * string. + * @ipc_protocol: Instance pointer of Protocol module. + * + * Returns: Pointer to string. + */ +const char * +ipc_protocol_sleep_notification_string(struct iosm_protocol *ipc_protocol); + +/** + * ipc_protocol_init - Allocates IPC protocol instance + * @ipc_imem: Pointer to iosm_imem structure + * + * Returns: Address of IPC protocol instance on success & NULL on failure. + */ +struct iosm_protocol *ipc_protocol_init(struct iosm_imem *ipc_imem); + +/** + * ipc_protocol_deinit - Deallocates IPC protocol instance + * @ipc_protocol: pointer to the IPC protocol instance + */ +void ipc_protocol_deinit(struct iosm_protocol *ipc_protocol); + +#endif |