| /* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| #include <linux/debugfs.h> |
| #include <linux/err.h> |
| #include <linux/fs.h> |
| #include <linux/gfp.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/ipc_logging.h> |
| #include <linux/irq.h> |
| #include <linux/kernel.h> |
| #include <linux/kthread.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/of.h> |
| #include <linux/of_irq.h> |
| #include <linux/platform_device.h> |
| #include <linux/printk.h> |
| #include <linux/sched.h> |
| #include <linux/seq_file.h> |
| #include <linux/sizes.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/srcu.h> |
| #include <linux/wait.h> |
| #include <linux/cpumask.h> |
| #include <soc/qcom/smem.h> |
| #include <soc/qcom/tracer_pkt.h> |
| #include "glink_core_if.h" |
| #include "glink_private.h" |
| #include "glink_xprt_if.h" |
| |
| #define XPRT_NAME "smem" |
| #define FIFO_FULL_RESERVE 8 |
| #define FIFO_ALIGNMENT 8 |
| #define TX_BLOCKED_CMD_RESERVE 8 /* size of struct read_notif_request */ |
| #define SMEM_CH_DESC_SIZE 32 |
| #define RPM_TOC_ID 0x67727430 |
| #define RPM_TX_FIFO_ID 0x61703272 |
| #define RPM_RX_FIFO_ID 0x72326170 |
| #define RPM_TOC_SIZE 256 |
| #define RPM_MAX_TOC_ENTRIES 20 |
| #define RPM_FIFO_ADDR_ALIGN_BYTES 3 |
| #define TRACER_PKT_FEATURE BIT(2) |
| #define DEFERRED_CMDS_THRESHOLD 25 |
| /** |
| * enum command_types - definition of the types of commands sent/received |
| * @VERSION_CMD: Version and feature set supported |
| * @VERSION_ACK_CMD: Response for @VERSION_CMD |
| * @OPEN_CMD: Open a channel |
| * @CLOSE_CMD: Close a channel |
| * @OPEN_ACK_CMD: Response to @OPEN_CMD |
| * @RX_INTENT_CMD: RX intent for a channel was queued |
| * @RX_DONE_CMD: Use of RX intent for a channel is complete |
| * @RX_INTENT_REQ_CMD: Request to have RX intent queued |
| * @RX_INTENT_REQ_ACK_CMD: Response for @RX_INTENT_REQ_CMD |
| * @TX_DATA_CMD: Start of a data transfer |
| * @ZERO_COPY_TX_DATA_CMD: Start of a data transfer with zero copy |
| * @CLOSE_ACK_CMD: Response for @CLOSE_CMD |
| * @TX_DATA_CONT_CMD: Continuation or end of a data transfer |
| * @READ_NOTIF_CMD: Request for a notification when this cmd is read |
| * @RX_DONE_W_REUSE_CMD: Same as @RX_DONE but also reuse the used intent |
| * @SIGNALS_CMD: Sideband signals |
| * @TRACER_PKT_CMD: Start of a Tracer Packet Command |
| * @TRACER_PKT_CONT_CMD: Continuation or end of a Tracer Packet Command |
| */ |
| enum command_types { |
| VERSION_CMD, |
| VERSION_ACK_CMD, |
| OPEN_CMD, |
| CLOSE_CMD, |
| OPEN_ACK_CMD, |
| RX_INTENT_CMD, |
| RX_DONE_CMD, |
| RX_INTENT_REQ_CMD, |
| RX_INTENT_REQ_ACK_CMD, |
| TX_DATA_CMD, |
| ZERO_COPY_TX_DATA_CMD, |
| CLOSE_ACK_CMD, |
| TX_DATA_CONT_CMD, |
| READ_NOTIF_CMD, |
| RX_DONE_W_REUSE_CMD, |
| SIGNALS_CMD, |
| TRACER_PKT_CMD, |
| TRACER_PKT_CONT_CMD, |
| }; |
| |
| /** |
| * struct channel_desc - description of a channel fifo with a remote entity |
| * @read_index: The read index for the fifo where data should be |
| * consumed from. |
| * @write_index: The write index for the fifo where data should produced |
| * to. |
| * |
| * This structure resides in SMEM and contains the control information for the |
| * fifo data pipes of the channel. There is one physical channel between us |
| * and a remote entity. |
| */ |
| struct channel_desc { |
| uint32_t read_index; |
| uint32_t write_index; |
| }; |
| |
| /** |
| * struct mailbox_config_info - description of a mailbox tranposrt channel |
| * @tx_read_index: Offset into the tx fifo where data should be read from. |
| * @tx_write_index: Offset into the tx fifo where new data will be placed. |
| * @tx_size: Size of the transmit fifo in bytes. |
| * @rx_read_index: Offset into the rx fifo where data should be read from. |
| * @rx_write_index: Offset into the rx fifo where new data will be placed. |
| * @rx_size: Size of the receive fifo in bytes. |
| * @fifo: The fifos for the channel. |
| */ |
| struct mailbox_config_info { |
| uint32_t tx_read_index; |
| uint32_t tx_write_index; |
| uint32_t tx_size; |
| uint32_t rx_read_index; |
| uint32_t rx_write_index; |
| uint32_t rx_size; |
| char fifo[]; /* tx fifo, then rx fifo */ |
| }; |
| |
| /** |
| * struct edge_info - local information for managing a single complete edge |
| * @xprt_if: The transport interface registered with the |
| * glink core associated with this edge. |
| * @xprt_cfg: The transport configuration for the glink core |
| * assocaited with this edge. |
| * @intentless: True if this edge runs in intentless mode. |
| * @irq_disabled: Flag indicating the whether interrupt is enabled |
| * or disabled. |
| * @remote_proc_id: The SMEM processor id for the remote side. |
| * @rx_reset_reg: Reference to the register to reset the rx irq |
| * line, if applicable. |
| * @out_irq_reg: Reference to the register to send an irq to the |
| * remote side. |
| * @out_irq_mask: Mask written to @out_irq_reg to trigger the |
| * correct irq. |
| * @irq_line: The incoming interrupt line. |
| * @tx_irq_count: Number of interrupts triggered. |
| * @rx_irq_count: Number of interrupts received. |
| * @tx_ch_desc: Reference to the channel description structure |
| * for tx in SMEM for this edge. |
| * @rx_ch_desc: Reference to the channel description structure |
| * for rx in SMEM for this edge. |
| * @tx_fifo: Reference to the transmit fifo in SMEM. |
| * @rx_fifo: Reference to the receive fifo in SMEM. |
| * @tx_fifo_size: Total size of @tx_fifo. |
| * @rx_fifo_size: Total size of @rx_fifo. |
| * @read_from_fifo: Memcpy for this edge. |
| * @write_to_fifo: Memcpy for this edge. |
| * @write_lock: Lock to serialize access to @tx_fifo. |
| * @tx_blocked_queue: Queue of entities waiting for the remote side to |
| * signal @tx_fifo has flushed and is now empty. |
| * @tx_resume_needed: A tx resume signal needs to be sent to the glink |
| * core once the remote side indicates @tx_fifo has |
| * flushed. |
| * @tx_blocked_signal_sent: Flag to indicate the flush signal has already |
| * been sent, and a response is pending from the |
| * remote side. Protected by @write_lock. |
| * @kwork: Work to be executed when an irq is received. |
| * @kworker: Handle to the entity processing of |
| deferred commands. |
| * @tasklet Handle to tasklet to process incoming data |
| packets in atomic manner. |
| * @task: Handle to the task context used to run @kworker. |
| * @use_ref: Active uses of this transport use this to grab |
| * a reference. Used for ssr synchronization. |
| * @in_ssr: Signals if this transport is in ssr. |
| * @rx_lock: Used to serialize concurrent instances of rx |
| * processing. |
| * @deferred_cmds: List of deferred commands that need to be |
| * processed in process context. |
| * @deferred_cmds_cnt: Number of deferred commands in queue. |
| * @rt_vote_lock: Serialize access to RT rx votes |
| * @rt_votes: Vote count for RT rx thread priority |
| * @num_pw_states: Size of @ramp_time_us. |
| * @ramp_time_us: Array of ramp times in microseconds where array |
| * index position represents a power state. |
| * @mailbox: Mailbox transport channel description reference. |
| */ |
| struct edge_info { |
| struct glink_transport_if xprt_if; |
| struct glink_core_transport_cfg xprt_cfg; |
| bool intentless; |
| bool irq_disabled; |
| uint32_t remote_proc_id; |
| void __iomem *rx_reset_reg; |
| void __iomem *out_irq_reg; |
| uint32_t out_irq_mask; |
| uint32_t irq_line; |
| uint32_t tx_irq_count; |
| uint32_t rx_irq_count; |
| struct channel_desc *tx_ch_desc; |
| struct channel_desc *rx_ch_desc; |
| void __iomem *tx_fifo; |
| void __iomem *rx_fifo; |
| uint32_t tx_fifo_size; |
| uint32_t rx_fifo_size; |
| void * (*read_from_fifo)(void *dest, const void *src, size_t num_bytes); |
| void * (*write_to_fifo)(void *dest, const void *src, size_t num_bytes); |
| spinlock_t write_lock; |
| wait_queue_head_t tx_blocked_queue; |
| bool tx_resume_needed; |
| bool tx_blocked_signal_sent; |
| struct kthread_work kwork; |
| struct kthread_worker kworker; |
| struct task_struct *task; |
| struct tasklet_struct tasklet; |
| struct srcu_struct use_ref; |
| bool in_ssr; |
| spinlock_t rx_lock; |
| struct list_head deferred_cmds; |
| uint32_t deferred_cmds_cnt; |
| spinlock_t rt_vote_lock; |
| uint32_t rt_votes; |
| uint32_t num_pw_states; |
| uint32_t readback; |
| unsigned long *ramp_time_us; |
| struct mailbox_config_info *mailbox; |
| }; |
| |
| /** |
| * struct deferred_cmd - description of a command to be processed later |
| * @list_node: Used to put this command on a list in the edge. |
| * @id: ID of the command. |
| * @param1: Parameter one of the command. |
| * @param2: Parameter two of the command. |
| * @data: Extra data associated with the command, if applicable. |
| * |
| * This structure stores the relevant information of a command that was removed |
| * from the fifo but needs to be processed at a later time. |
| */ |
| struct deferred_cmd { |
| struct list_head list_node; |
| uint16_t id; |
| uint16_t param1; |
| uint32_t param2; |
| void *data; |
| }; |
| |
| static uint32_t negotiate_features_v1(struct glink_transport_if *if_ptr, |
| const struct glink_core_version *version, |
| uint32_t features); |
| static void register_debugfs_info(struct edge_info *einfo); |
| |
| static struct edge_info *edge_infos[NUM_SMEM_SUBSYSTEMS]; |
| static DEFINE_MUTEX(probe_lock); |
| static struct glink_core_version versions[] = { |
| {1, TRACER_PKT_FEATURE, negotiate_features_v1}, |
| }; |
| |
| /** |
| * send_irq() - send an irq to a remote entity as an event signal |
| * @einfo: Which remote entity that should receive the irq. |
| */ |
| static void send_irq(struct edge_info *einfo) |
| { |
| /* |
| * Any data associated with this event must be visable to the remote |
| * before the interrupt is triggered |
| */ |
| einfo->readback = einfo->tx_ch_desc->write_index; |
| wmb(); |
| writel_relaxed(einfo->out_irq_mask, einfo->out_irq_reg); |
| if (einfo->remote_proc_id != SMEM_SPSS) |
| writel_relaxed(0, einfo->out_irq_reg); |
| einfo->tx_irq_count++; |
| } |
| |
| /** |
| * read_from_fifo() - memcpy from fifo memory |
| * @dest: Destination address. |
| * @src: Source address. |
| * @num_bytes: Number of bytes to copy. |
| * |
| * Return: Destination address. |
| */ |
| static void *read_from_fifo(void *dest, const void *src, size_t num_bytes) |
| { |
| memcpy_fromio(dest, src, num_bytes); |
| return dest; |
| } |
| |
| /** |
| * write_to_fifo() - memcpy to fifo memory |
| * @dest: Destination address. |
| * @src: Source address. |
| * @num_bytes: Number of bytes to copy. |
| * |
| * Return: Destination address. |
| */ |
| static void *write_to_fifo(void *dest, const void *src, size_t num_bytes) |
| { |
| memcpy_toio(dest, src, num_bytes); |
| return dest; |
| } |
| |
| /** |
| * memcpy32_toio() - memcpy to word access only memory |
| * @dest: Destination address. |
| * @src: Source address. |
| * @num_bytes: Number of bytes to copy. |
| * |
| * Return: Destination address. |
| */ |
| static void *memcpy32_toio(void *dest, const void *src, size_t num_bytes) |
| { |
| uint32_t *dest_local = (uint32_t *)dest; |
| uint32_t *src_local = (uint32_t *)src; |
| |
| if (WARN_ON(num_bytes & RPM_FIFO_ADDR_ALIGN_BYTES)) |
| return ERR_PTR(-EINVAL); |
| if (WARN_ON(!dest_local || |
| ((uintptr_t)dest_local & RPM_FIFO_ADDR_ALIGN_BYTES))) |
| return ERR_PTR(-EINVAL); |
| if (WARN_ON(!src_local || |
| ((uintptr_t)src_local & RPM_FIFO_ADDR_ALIGN_BYTES))) |
| return ERR_PTR(-EINVAL); |
| num_bytes /= sizeof(uint32_t); |
| |
| while (num_bytes--) |
| __raw_writel_no_log(*src_local++, dest_local++); |
| |
| return dest; |
| } |
| |
| /** |
| * memcpy32_fromio() - memcpy from word access only memory |
| * @dest: Destination address. |
| * @src: Source address. |
| * @num_bytes: Number of bytes to copy. |
| * |
| * Return: Destination address. |
| */ |
| static void *memcpy32_fromio(void *dest, const void *src, size_t num_bytes) |
| { |
| uint32_t *dest_local = (uint32_t *)dest; |
| uint32_t *src_local = (uint32_t *)src; |
| |
| if (WARN_ON(num_bytes & RPM_FIFO_ADDR_ALIGN_BYTES)) |
| return ERR_PTR(-EINVAL); |
| if (WARN_ON(!dest_local || |
| ((uintptr_t)dest_local & RPM_FIFO_ADDR_ALIGN_BYTES))) |
| return ERR_PTR(-EINVAL); |
| if (WARN_ON(!src_local || |
| ((uintptr_t)src_local & RPM_FIFO_ADDR_ALIGN_BYTES))) |
| return ERR_PTR(-EINVAL); |
| num_bytes /= sizeof(uint32_t); |
| |
| while (num_bytes--) |
| *dest_local++ = __raw_readl_no_log(src_local++); |
| |
| return dest; |
| } |
| |
| /** |
| * fifo_read_avail() - how many bytes are available to be read from an edge |
| * @einfo: The concerned edge to query. |
| * |
| * Return: The number of bytes available to be read from edge. |
| */ |
| static uint32_t fifo_read_avail(struct edge_info *einfo) |
| { |
| uint32_t read_index = einfo->rx_ch_desc->read_index; |
| uint32_t write_index = einfo->rx_ch_desc->write_index; |
| uint32_t fifo_size = einfo->rx_fifo_size; |
| uint32_t bytes_avail; |
| |
| bytes_avail = write_index - read_index; |
| if (write_index < read_index) |
| /* |
| * Case: W < R - Write has wrapped |
| * -------------------------------- |
| * In this case, the write operation has wrapped past the end |
| * of the FIFO which means that now calculating the amount of |
| * data in the FIFO results in a negative number. This can be |
| * easily fixed by adding the fifo_size to the value. Even |
| * though the values are unsigned, subtraction is always done |
| * using 2's complement which means that the result will still |
| * be correct once the FIFO size has been added to the negative |
| * result. |
| * |
| * Example: |
| * '-' = data in fifo |
| * '.' = empty |
| * |
| * 0 1 |
| * 0123456789012345 |
| * |-----w.....r----| |
| * 0 N |
| * |
| * write = 5 = 101b |
| * read = 11 = 1011b |
| * Data in FIFO |
| * (write - read) + fifo_size = (101b - 1011b) + 10000b |
| * = 11111010b + 10000b = 1010b = 10 |
| */ |
| bytes_avail += fifo_size; |
| |
| return bytes_avail; |
| } |
| |
| /** |
| * fifo_write_avail() - how many bytes can be written to the edge |
| * @einfo: The concerned edge to query. |
| * |
| * Calculates the number of bytes that can be transmitted at this time. |
| * Automatically reserves some space to maintain alignment when the fifo is |
| * completely full, and reserves space so that the flush command can always be |
| * transmitted when needed. |
| * |
| * Return: The number of bytes available to be read from edge. |
| */ |
| static uint32_t fifo_write_avail(struct edge_info *einfo) |
| { |
| uint32_t read_index = einfo->tx_ch_desc->read_index; |
| uint32_t write_index = einfo->tx_ch_desc->write_index; |
| uint32_t fifo_size = einfo->tx_fifo_size; |
| uint32_t bytes_avail = read_index - write_index; |
| |
| if (read_index <= write_index) |
| bytes_avail += fifo_size; |
| if (bytes_avail < FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE) |
| bytes_avail = 0; |
| else |
| bytes_avail -= FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE; |
| |
| return bytes_avail; |
| } |
| |
| /** |
| * fifo_read() - read data from an edge |
| * @einfo: The concerned edge to read from. |
| * @_data: Buffer to copy the read data into. |
| * @len: The ammount of data to read in bytes. |
| * |
| * Return: The number of bytes read. |
| */ |
| static int fifo_read(struct edge_info *einfo, void *_data, int len) |
| { |
| void *ptr; |
| void *ret; |
| void *data = _data; |
| int orig_len = len; |
| uint32_t read_index = einfo->rx_ch_desc->read_index; |
| uint32_t write_index = einfo->rx_ch_desc->write_index; |
| uint32_t fifo_size = einfo->rx_fifo_size; |
| uint32_t n; |
| |
| while (len) { |
| ptr = einfo->rx_fifo + read_index; |
| if (read_index <= write_index) |
| n = write_index - read_index; |
| else |
| n = fifo_size - read_index; |
| |
| if (n == 0) |
| break; |
| if (n > len) |
| n = len; |
| |
| ret = einfo->read_from_fifo(data, ptr, n); |
| if (IS_ERR(ret)) |
| return PTR_ERR(ret); |
| |
| data += n; |
| len -= n; |
| read_index += n; |
| if (read_index >= fifo_size) |
| read_index -= fifo_size; |
| } |
| einfo->rx_ch_desc->read_index = read_index; |
| |
| return orig_len - len; |
| } |
| |
| /** |
| * fifo_write_body() - Copy transmit data into an edge |
| * @einfo: The concerned edge to copy into. |
| * @_data: Buffer of data to copy from. |
| * @len: Size of data to copy in bytes. |
| * @write_index: Index into the channel where the data should be copied. |
| * |
| * Return: Number of bytes remaining to be copied into the edge. |
| */ |
| static int fifo_write_body(struct edge_info *einfo, const void *_data, |
| int len, uint32_t *write_index) |
| { |
| void *ptr; |
| void *ret; |
| const void *data = _data; |
| uint32_t read_index = einfo->tx_ch_desc->read_index; |
| uint32_t fifo_size = einfo->tx_fifo_size; |
| uint32_t n; |
| |
| while (len) { |
| ptr = einfo->tx_fifo + *write_index; |
| if (*write_index < read_index) { |
| n = read_index - *write_index - FIFO_FULL_RESERVE; |
| } else { |
| if (read_index < FIFO_FULL_RESERVE) |
| n = fifo_size + read_index - *write_index - |
| FIFO_FULL_RESERVE; |
| else |
| n = fifo_size - *write_index; |
| } |
| |
| if (n == 0) |
| break; |
| if (n > len) |
| n = len; |
| |
| ret = einfo->write_to_fifo(ptr, data, n); |
| if (IS_ERR(ret)) |
| return PTR_ERR(ret); |
| |
| data += n; |
| len -= n; |
| *write_index += n; |
| if (*write_index >= fifo_size) |
| *write_index -= fifo_size; |
| } |
| return len; |
| } |
| |
| /** |
| * fifo_write() - Write data into an edge |
| * @einfo: The concerned edge to write to. |
| * @data: Buffer of data to write. |
| * @len: Length of data to write, in bytes. |
| * |
| * Wrapper around fifo_write_body() to manage additional details that are |
| * necessary for a complete write event. Does not manage concurrency. Clients |
| * should use fifo_write_avail() to check if there is sufficent space before |
| * calling fifo_write(). |
| * |
| * Return: Number of bytes written to the edge. |
| */ |
| static int fifo_write(struct edge_info *einfo, const void *data, int len) |
| { |
| int orig_len = len; |
| uint32_t write_index = einfo->tx_ch_desc->write_index; |
| |
| len = fifo_write_body(einfo, data, len, &write_index); |
| if (unlikely(len < 0)) |
| return len; |
| |
| /* All data writes need to be flushed to memory before the write index |
| * is updated. This protects against a race condition where the remote |
| * reads stale data because the write index was written before the data. |
| */ |
| wmb(); |
| einfo->tx_ch_desc->write_index = write_index; |
| send_irq(einfo); |
| |
| return orig_len - len; |
| } |
| |
| /** |
| * fifo_write_complex() - writes a transaction of multiple buffers to an edge |
| * @einfo: The concerned edge to write to. |
| * @data1: The first buffer of data to write. |
| * @len1: The length of the first buffer in bytes. |
| * @data2: The second buffer of data to write. |
| * @len2: The length of the second buffer in bytes. |
| * @data3: The thirs buffer of data to write. |
| * @len3: The length of the third buffer in bytes. |
| * |
| * A variant of fifo_write() which optimizes the usecase found in tx(). The |
| * remote side expects all or none of the transmitted data to be available. |
| * This prevents the tx() usecase from calling fifo_write() multiple times. The |
| * alternative would be an allocation and additional memcpy to create a buffer |
| * to copy all the data segments into one location before calling fifo_write(). |
| * |
| * Return: Number of bytes written to the edge. |
| */ |
| static int fifo_write_complex(struct edge_info *einfo, |
| const void *data1, int len1, |
| const void *data2, int len2, |
| const void *data3, int len3) |
| { |
| int orig_len = len1 + len2 + len3; |
| uint32_t write_index = einfo->tx_ch_desc->write_index; |
| |
| len1 = fifo_write_body(einfo, data1, len1, &write_index); |
| if (unlikely(len1 < 0)) |
| return len1; |
| len2 = fifo_write_body(einfo, data2, len2, &write_index); |
| if (unlikely(len2 < 0)) |
| return len2; |
| len3 = fifo_write_body(einfo, data3, len3, &write_index); |
| if (unlikely(len3 < 0)) |
| return len3; |
| |
| /* All data writes need to be flushed to memory before the write index |
| * is updated. This protects against a race condition where the remote |
| * reads stale data because the write index was written before the data. |
| */ |
| wmb(); |
| einfo->tx_ch_desc->write_index = write_index; |
| send_irq(einfo); |
| |
| return orig_len - len1 - len2 - len3; |
| } |
| |
| /** |
| * send_tx_blocked_signal() - send the flush command as we are blocked from tx |
| * @einfo: The concerned edge which is blocked. |
| * |
| * Used to send a signal to the remote side that we have no more space to |
| * transmit data and therefore need the remote side to signal us when they have |
| * cleared some space by reading some data. This function relies upon the |
| * assumption that fifo_write_avail() will reserve some space so that the flush |
| * signal command can always be put into the transmit fifo, even when "everyone" |
| * else thinks that the transmit fifo is truely full. This function assumes |
| * that it is called with the write_lock already locked. |
| */ |
| static void send_tx_blocked_signal(struct edge_info *einfo) |
| { |
| struct read_notif_request { |
| uint16_t cmd; |
| uint16_t reserved; |
| uint32_t reserved2; |
| }; |
| struct read_notif_request read_notif_req; |
| |
| read_notif_req.cmd = READ_NOTIF_CMD; |
| read_notif_req.reserved = 0; |
| read_notif_req.reserved2 = 0; |
| |
| if (!einfo->tx_blocked_signal_sent) { |
| einfo->tx_blocked_signal_sent = true; |
| fifo_write(einfo, &read_notif_req, sizeof(read_notif_req)); |
| } |
| } |
| |
| /** |
| * fifo_tx() - transmit data on an edge |
| * @einfo: The concerned edge to transmit on. |
| * @data: Buffer of data to transmit. |
| * @len: Length of data to transmit in bytes. |
| * |
| * This helper function is the preferred interface to fifo_write() and should |
| * be used in the normal case for transmitting entities. fifo_tx() will block |
| * until there is sufficent room to transmit the requested ammount of data. |
| * fifo_tx() will manage any concurrency between multiple transmitters on a |
| * channel. |
| * |
| * Return: Number of bytes transmitted. |
| */ |
| static int fifo_tx(struct edge_info *einfo, const void *data, int len) |
| { |
| unsigned long flags; |
| int ret; |
| |
| DEFINE_WAIT(wait); |
| |
| spin_lock_irqsave(&einfo->write_lock, flags); |
| while (fifo_write_avail(einfo) < len) { |
| send_tx_blocked_signal(einfo); |
| prepare_to_wait(&einfo->tx_blocked_queue, &wait, |
| TASK_UNINTERRUPTIBLE); |
| if (fifo_write_avail(einfo) < len && !einfo->in_ssr) { |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| schedule(); |
| spin_lock_irqsave(&einfo->write_lock, flags); |
| } |
| finish_wait(&einfo->tx_blocked_queue, &wait); |
| if (einfo->in_ssr) { |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| return -EFAULT; |
| } |
| } |
| ret = fifo_write(einfo, data, len); |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| |
| return ret; |
| } |
| |
| /** |
| * process_rx_data() - process received data from an edge |
| * @einfo: The edge the data was received on. |
| * @cmd_id: ID to specify the type of data. |
| * @rcid: The remote channel id associated with the data. |
| * @intend_id: The intent the data should be put in. |
| */ |
| static void process_rx_data(struct edge_info *einfo, uint16_t cmd_id, |
| uint32_t rcid, uint32_t intent_id) |
| { |
| struct command { |
| uint32_t frag_size; |
| uint32_t size_remaining; |
| }; |
| struct command cmd; |
| struct glink_core_rx_intent *intent; |
| char trash[FIFO_ALIGNMENT]; |
| int alignment; |
| bool err = false; |
| |
| fifo_read(einfo, &cmd, sizeof(cmd)); |
| |
| intent = einfo->xprt_if.glink_core_if_ptr->rx_get_pkt_ctx( |
| &einfo->xprt_if, rcid, intent_id); |
| if (intent == NULL) { |
| GLINK_ERR("%s: no intent for ch %d liid %d\n", __func__, rcid, |
| intent_id); |
| err = true; |
| } else if (intent->data == NULL) { |
| if (einfo->intentless) { |
| intent->data = kmalloc(cmd.frag_size, |
| __GFP_ATOMIC | __GFP_HIGH); |
| if (!intent->data) { |
| err = true; |
| GLINK_ERR( |
| "%s: atomic alloc fail ch %d liid %d size %d\n", |
| __func__, rcid, intent_id, |
| cmd.frag_size); |
| } else { |
| intent->intent_size = cmd.frag_size; |
| } |
| } else { |
| GLINK_ERR( |
| "%s: intent for ch %d liid %d has no data buff\n", |
| __func__, rcid, intent_id); |
| err = true; |
| } |
| } |
| |
| if (!err && |
| (intent->intent_size - intent->write_offset < cmd.frag_size || |
| intent->write_offset + cmd.size_remaining > intent->intent_size)) { |
| GLINK_ERR("%s: rx data size:%d and remaining:%d %s %d %s:%d\n", |
| __func__, |
| cmd.frag_size, |
| cmd.size_remaining, |
| "will overflow ch", |
| rcid, |
| "intent", |
| intent_id); |
| err = true; |
| } |
| |
| if (err) { |
| alignment = ALIGN(cmd.frag_size, FIFO_ALIGNMENT); |
| alignment -= cmd.frag_size; |
| while (cmd.frag_size) { |
| if (cmd.frag_size > FIFO_ALIGNMENT) { |
| fifo_read(einfo, trash, FIFO_ALIGNMENT); |
| cmd.frag_size -= FIFO_ALIGNMENT; |
| } else { |
| fifo_read(einfo, trash, cmd.frag_size); |
| cmd.frag_size = 0; |
| } |
| } |
| if (alignment) |
| fifo_read(einfo, trash, alignment); |
| return; |
| } |
| fifo_read(einfo, intent->data + intent->write_offset, cmd.frag_size); |
| intent->write_offset += cmd.frag_size; |
| intent->pkt_size += cmd.frag_size; |
| |
| alignment = ALIGN(cmd.frag_size, FIFO_ALIGNMENT); |
| alignment -= cmd.frag_size; |
| if (alignment) |
| fifo_read(einfo, trash, alignment); |
| |
| if (unlikely((cmd_id == TRACER_PKT_CMD || |
| cmd_id == TRACER_PKT_CONT_CMD) && !cmd.size_remaining)) { |
| tracer_pkt_log_event(intent->data, GLINK_XPRT_RX); |
| intent->tracer_pkt = true; |
| } |
| |
| einfo->xprt_if.glink_core_if_ptr->rx_put_pkt_ctx(&einfo->xprt_if, |
| rcid, |
| intent, |
| cmd.size_remaining ? |
| false : true); |
| } |
| |
| /** |
| * queue_cmd() - queue a deferred command for later processing |
| * @einfo: Edge to queue commands on. |
| * @cmd: Command to queue. |
| * @data: Command specific data to queue with the command. |
| * |
| * Return: True if queuing was successful, false otherwise. |
| */ |
| static bool queue_cmd(struct edge_info *einfo, void *cmd, void *data) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t param1; |
| uint32_t param2; |
| }; |
| struct command *_cmd = cmd; |
| struct deferred_cmd *d_cmd; |
| |
| d_cmd = kmalloc(sizeof(*d_cmd), GFP_ATOMIC); |
| if (!d_cmd) { |
| GLINK_ERR("%s: Discarding cmd %d\n", __func__, _cmd->id); |
| return false; |
| } |
| d_cmd->id = _cmd->id; |
| d_cmd->param1 = _cmd->param1; |
| d_cmd->param2 = _cmd->param2; |
| d_cmd->data = data; |
| list_add_tail(&d_cmd->list_node, &einfo->deferred_cmds); |
| einfo->deferred_cmds_cnt++; |
| kthread_queue_work(&einfo->kworker, &einfo->kwork); |
| return true; |
| } |
| |
| /** |
| * get_rx_fifo() - Find the rx fifo for an edge |
| * @einfo: Edge to find the fifo for. |
| * |
| * Return: True if fifo was found, false otherwise. |
| */ |
| static bool get_rx_fifo(struct edge_info *einfo) |
| { |
| if (einfo->mailbox) { |
| einfo->rx_fifo = &einfo->mailbox->fifo[einfo->mailbox->tx_size]; |
| einfo->rx_fifo_size = einfo->mailbox->rx_size; |
| } else { |
| einfo->rx_fifo = smem_get_entry(SMEM_GLINK_NATIVE_XPRT_FIFO_1, |
| &einfo->rx_fifo_size, |
| einfo->remote_proc_id, |
| SMEM_ITEM_CACHED_FLAG); |
| if (!einfo->rx_fifo) |
| einfo->rx_fifo = smem_get_entry( |
| SMEM_GLINK_NATIVE_XPRT_FIFO_1, |
| &einfo->rx_fifo_size, |
| einfo->remote_proc_id, |
| 0); |
| if (!einfo->rx_fifo) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * tx_wakeup_worker() - worker function to wakeup tx blocked thread |
| * @work: kwork associated with the edge to process commands on. |
| */ |
| static void tx_wakeup_worker(struct edge_info *einfo) |
| { |
| struct glink_transport_if xprt_if = einfo->xprt_if; |
| bool trigger_wakeup = false; |
| bool trigger_resume = false; |
| unsigned long flags; |
| |
| if (einfo->in_ssr) |
| return; |
| |
| spin_lock_irqsave(&einfo->write_lock, flags); |
| if (fifo_write_avail(einfo)) { |
| if (einfo->tx_blocked_signal_sent) |
| einfo->tx_blocked_signal_sent = false; |
| if (einfo->tx_resume_needed) { |
| einfo->tx_resume_needed = false; |
| trigger_resume = true; |
| } |
| } |
| if (waitqueue_active(&einfo->tx_blocked_queue)) { /* tx waiting ?*/ |
| trigger_wakeup = true; |
| } |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| if (trigger_wakeup) |
| wake_up_all(&einfo->tx_blocked_queue); |
| if (trigger_resume) |
| xprt_if.glink_core_if_ptr->tx_resume(&xprt_if); |
| } |
| |
| /** |
| * __rx_worker() - process received commands on a specific edge |
| * @einfo: Edge to process commands on. |
| * @atomic_ctx: Indicates if the caller is in atomic context and requires any |
| * non-atomic operations to be deferred. |
| */ |
| static void __rx_worker(struct edge_info *einfo, bool atomic_ctx) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t param1; |
| uint32_t param2; |
| }; |
| struct intent_desc { |
| uint32_t size; |
| uint32_t id; |
| }; |
| struct command cmd; |
| struct intent_desc intent; |
| struct intent_desc *intents; |
| int i; |
| bool granted; |
| unsigned long flags; |
| int rcu_id; |
| uint16_t rcid; |
| uint32_t name_len; |
| uint32_t len; |
| char *name; |
| char trash[FIFO_ALIGNMENT]; |
| struct deferred_cmd *d_cmd; |
| void *cmd_data; |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| |
| if (unlikely(!einfo->rx_fifo) && atomic_ctx) { |
| if (!get_rx_fifo(einfo)) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return; |
| } |
| einfo->in_ssr = false; |
| einfo->xprt_if.glink_core_if_ptr->link_up(&einfo->xprt_if); |
| } |
| |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return; |
| } |
| |
| if ((atomic_ctx) && ((einfo->tx_resume_needed) || |
| (waitqueue_active(&einfo->tx_blocked_queue)))) /* tx waiting ?*/ |
| tx_wakeup_worker(einfo); |
| |
| /* |
| * Access to the fifo needs to be synchronized, however only the calls |
| * into the core from process_rx_data() are compatible with an atomic |
| * processing context. For everything else, we need to do all the fifo |
| * processing, then unlock the lock for the call into the core. Data |
| * in the fifo is allowed to be processed immediately instead of being |
| * ordered with the commands because the channel open process prevents |
| * intents from being queued (which prevents data from being sent) until |
| * all the channel open commands are processed by the core, thus |
| * eliminating a race. |
| */ |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| while (fifo_read_avail(einfo) || |
| (!atomic_ctx && !list_empty(&einfo->deferred_cmds))) { |
| if (einfo->in_ssr) |
| break; |
| |
| if (atomic_ctx && !einfo->intentless && |
| einfo->deferred_cmds_cnt >= DEFERRED_CMDS_THRESHOLD) |
| break; |
| |
| if (!atomic_ctx && !list_empty(&einfo->deferred_cmds)) { |
| d_cmd = list_first_entry(&einfo->deferred_cmds, |
| struct deferred_cmd, list_node); |
| list_del(&d_cmd->list_node); |
| einfo->deferred_cmds_cnt--; |
| cmd.id = d_cmd->id; |
| cmd.param1 = d_cmd->param1; |
| cmd.param2 = d_cmd->param2; |
| cmd_data = d_cmd->data; |
| kfree(d_cmd); |
| } else { |
| fifo_read(einfo, &cmd, sizeof(cmd)); |
| cmd_data = NULL; |
| } |
| |
| switch (cmd.id) { |
| case VERSION_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_version( |
| &einfo->xprt_if, |
| cmd.param1, |
| cmd.param2); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case VERSION_ACK_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_version_ack( |
| &einfo->xprt_if, |
| cmd.param1, |
| cmd.param2); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case OPEN_CMD: |
| rcid = cmd.param1; |
| name_len = cmd.param2; |
| |
| if (cmd_data) { |
| name = cmd_data; |
| } else { |
| len = ALIGN(name_len, FIFO_ALIGNMENT); |
| name = kmalloc(len, GFP_ATOMIC); |
| if (!name) { |
| pr_err("No memory available to rx ch open cmd name. Discarding cmd.\n"); |
| while (len) { |
| fifo_read(einfo, trash, |
| FIFO_ALIGNMENT); |
| len -= FIFO_ALIGNMENT; |
| } |
| break; |
| } |
| fifo_read(einfo, name, len); |
| } |
| if (atomic_ctx) { |
| if (!queue_cmd(einfo, &cmd, name)) |
| kfree(name); |
| break; |
| } |
| |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_remote_open( |
| &einfo->xprt_if, |
| rcid, |
| name, |
| SMEM_XPRT_ID); |
| kfree(name); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case CLOSE_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr-> |
| rx_cmd_ch_remote_close( |
| &einfo->xprt_if, |
| cmd.param1); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case OPEN_ACK_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_open_ack( |
| &einfo->xprt_if, |
| cmd.param1, |
| SMEM_XPRT_ID); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case RX_INTENT_CMD: |
| /* |
| * One intent listed with this command. This is the |
| * expected case and can be optimized over the general |
| * case of an array of intents. |
| */ |
| if (cmd.param2 == 1) { |
| if (cmd_data) { |
| intent.id = ((struct intent_desc *) |
| cmd_data)->id; |
| intent.size = ((struct intent_desc *) |
| cmd_data)->size; |
| kfree(cmd_data); |
| } else { |
| fifo_read(einfo, &intent, |
| sizeof(intent)); |
| } |
| if (atomic_ctx) { |
| cmd_data = kmalloc(sizeof(intent), |
| GFP_ATOMIC); |
| if (!cmd_data) { |
| GLINK_ERR( |
| "%s: dropping cmd %d\n", |
| __func__, cmd.id); |
| break; |
| } |
| ((struct intent_desc *)cmd_data)->id = |
| intent.id; |
| ((struct intent_desc *)cmd_data)->size = |
| intent.size; |
| if (!queue_cmd(einfo, &cmd, cmd_data)) |
| kfree(cmd_data); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr-> |
| rx_cmd_remote_rx_intent_put( |
| &einfo->xprt_if, |
| cmd.param1, |
| intent.id, |
| intent.size); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| } |
| |
| /* Array of intents to process */ |
| if (cmd_data) { |
| intents = cmd_data; |
| } else { |
| intents = kmalloc_array(cmd.param2, |
| sizeof(*intents), GFP_ATOMIC); |
| if (!intents) { |
| for (i = 0; i < cmd.param2; ++i) |
| fifo_read(einfo, &intent, |
| sizeof(intent)); |
| break; |
| } |
| fifo_read(einfo, intents, |
| sizeof(*intents) * cmd.param2); |
| } |
| if (atomic_ctx) { |
| if (!queue_cmd(einfo, &cmd, intents)) |
| kfree(intents); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| for (i = 0; i < cmd.param2; ++i) { |
| einfo->xprt_if.glink_core_if_ptr-> |
| rx_cmd_remote_rx_intent_put( |
| &einfo->xprt_if, |
| cmd.param1, |
| intents[i].id, |
| intents[i].size); |
| } |
| kfree(intents); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case RX_DONE_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_tx_done( |
| &einfo->xprt_if, |
| cmd.param1, |
| cmd.param2, |
| false); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case RX_INTENT_REQ_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr-> |
| rx_cmd_remote_rx_intent_req( |
| &einfo->xprt_if, |
| cmd.param1, |
| cmd.param2); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case RX_INTENT_REQ_ACK_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| granted = false; |
| if (cmd.param2 == 1) |
| granted = true; |
| einfo->xprt_if.glink_core_if_ptr-> |
| rx_cmd_rx_intent_req_ack( |
| &einfo->xprt_if, |
| cmd.param1, |
| granted); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case TX_DATA_CMD: |
| case TX_DATA_CONT_CMD: |
| case TRACER_PKT_CMD: |
| case TRACER_PKT_CONT_CMD: |
| process_rx_data(einfo, cmd.id, cmd.param1, cmd.param2); |
| break; |
| case CLOSE_ACK_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_close_ack( |
| &einfo->xprt_if, |
| cmd.param1); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case READ_NOTIF_CMD: |
| send_irq(einfo); |
| break; |
| case SIGNALS_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_remote_sigs( |
| &einfo->xprt_if, |
| cmd.param1, |
| cmd.param2); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| case RX_DONE_W_REUSE_CMD: |
| if (atomic_ctx) { |
| queue_cmd(einfo, &cmd, NULL); |
| break; |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| einfo->xprt_if.glink_core_if_ptr->rx_cmd_tx_done( |
| &einfo->xprt_if, |
| cmd.param1, |
| cmd.param2, |
| true); |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| break; |
| default: |
| pr_err("Unrecognized command: %d\n", cmd.id); |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| } |
| |
| /** |
| * rx_worker_atomic() - worker function to process received command in atomic |
| * context. |
| * @param: The param parameter passed during initialization of the tasklet. |
| */ |
| static void rx_worker_atomic(unsigned long param) |
| { |
| struct edge_info *einfo = (struct edge_info *)param; |
| |
| __rx_worker(einfo, true); |
| } |
| |
| /** |
| * rx_worker() - worker function to process received commands |
| * @work: kwork associated with the edge to process commands on. |
| */ |
| static void rx_worker(struct kthread_work *work) |
| { |
| struct edge_info *einfo; |
| |
| einfo = container_of(work, struct edge_info, kwork); |
| __rx_worker(einfo, false); |
| } |
| |
| irqreturn_t irq_handler(int irq, void *priv) |
| { |
| struct edge_info *einfo = (struct edge_info *)priv; |
| |
| if (einfo->rx_reset_reg) |
| writel_relaxed(einfo->out_irq_mask, einfo->rx_reset_reg); |
| |
| tasklet_hi_schedule(&einfo->tasklet); |
| einfo->rx_irq_count++; |
| |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * tx_cmd_version() - convert a version cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @version: The version number to encode. |
| * @features: The features information to encode. |
| */ |
| static void tx_cmd_version(struct glink_transport_if *if_ptr, uint32_t version, |
| uint32_t features) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t version; |
| uint32_t features; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return; |
| } |
| |
| cmd.id = VERSION_CMD; |
| cmd.version = version; |
| cmd.features = features; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| } |
| |
| /** |
| * tx_cmd_version_ack() - convert a version ack cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @version: The version number to encode. |
| * @features: The features information to encode. |
| */ |
| static void tx_cmd_version_ack(struct glink_transport_if *if_ptr, |
| uint32_t version, |
| uint32_t features) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t version; |
| uint32_t features; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return; |
| } |
| |
| cmd.id = VERSION_ACK_CMD; |
| cmd.version = version; |
| cmd.features = features; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| } |
| |
| /** |
| * set_version() - activate a negotiated version and feature set |
| * @if_ptr: The transport to configure. |
| * @version: The version to use. |
| * @features: The features to use. |
| * |
| * Return: The supported capabilities of the transport. |
| */ |
| static uint32_t set_version(struct glink_transport_if *if_ptr, uint32_t version, |
| uint32_t features) |
| { |
| struct edge_info *einfo; |
| uint32_t ret; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| ret = einfo->intentless ? |
| GCAP_INTENTLESS | GCAP_SIGNALS : GCAP_SIGNALS; |
| |
| if (features & TRACER_PKT_FEATURE) |
| ret |= GCAP_TRACER_PKT; |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return ret; |
| } |
| |
| /** |
| * tx_cmd_ch_open() - convert a channel open cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @name: The channel name to encode. |
| * @req_xprt: The transport the core would like to migrate this channel to. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int tx_cmd_ch_open(struct glink_transport_if *if_ptr, uint32_t lcid, |
| const char *name, uint16_t req_xprt) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t length; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| uint32_t buf_size; |
| void *buf; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| cmd.id = OPEN_CMD; |
| cmd.lcid = lcid; |
| cmd.length = strlen(name) + 1; |
| |
| buf_size = ALIGN(sizeof(cmd) + cmd.length, FIFO_ALIGNMENT); |
| |
| buf = kzalloc(buf_size, GFP_KERNEL); |
| if (!buf) { |
| GLINK_ERR("%s: malloc fail for %d size buf\n", |
| __func__, buf_size); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -ENOMEM; |
| } |
| |
| memcpy(buf, &cmd, sizeof(cmd)); |
| memcpy(buf + sizeof(cmd), name, cmd.length); |
| |
| fifo_tx(einfo, buf, buf_size); |
| |
| kfree(buf); |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * tx_cmd_ch_close() - convert a channel close cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int tx_cmd_ch_close(struct glink_transport_if *if_ptr, uint32_t lcid) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t reserved; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| cmd.id = CLOSE_CMD; |
| cmd.lcid = lcid; |
| cmd.reserved = 0; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * tx_cmd_ch_remote_open_ack() - convert a channel open ack cmd to wire format |
| * and transmit |
| * @if_ptr: The transport to transmit on. |
| * @rcid: The remote channel id to encode. |
| * @xprt_resp: The response to a transport migration request. |
| */ |
| static void tx_cmd_ch_remote_open_ack(struct glink_transport_if *if_ptr, |
| uint32_t rcid, uint16_t xprt_resp) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t rcid; |
| uint32_t reserved; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return; |
| } |
| |
| cmd.id = OPEN_ACK_CMD; |
| cmd.rcid = rcid; |
| cmd.reserved = 0; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| } |
| |
| /** |
| * tx_cmd_ch_remote_close_ack() - convert a channel close ack cmd to wire format |
| * and transmit |
| * @if_ptr: The transport to transmit on. |
| * @rcid: The remote channel id to encode. |
| */ |
| static void tx_cmd_ch_remote_close_ack(struct glink_transport_if *if_ptr, |
| uint32_t rcid) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t rcid; |
| uint32_t reserved; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return; |
| } |
| |
| cmd.id = CLOSE_ACK_CMD; |
| cmd.rcid = rcid; |
| cmd.reserved = 0; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| } |
| |
| /** |
| * ssr() - process a subsystem restart notification of a transport |
| * @if_ptr: The transport to restart |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int ssr(struct glink_transport_if *if_ptr) |
| { |
| struct edge_info *einfo; |
| struct deferred_cmd *cmd; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| BUG_ON(einfo->remote_proc_id == SMEM_RPM); |
| |
| einfo->in_ssr = true; |
| wake_up_all(&einfo->tx_blocked_queue); |
| |
| synchronize_srcu(&einfo->use_ref); |
| |
| while (!list_empty(&einfo->deferred_cmds)) { |
| cmd = list_first_entry(&einfo->deferred_cmds, |
| struct deferred_cmd, list_node); |
| list_del(&cmd->list_node); |
| kfree(cmd->data); |
| kfree(cmd); |
| } |
| |
| einfo->tx_resume_needed = false; |
| einfo->tx_blocked_signal_sent = false; |
| einfo->rx_fifo = NULL; |
| einfo->rx_fifo_size = 0; |
| einfo->tx_ch_desc->write_index = 0; |
| einfo->rx_ch_desc->read_index = 0; |
| einfo->xprt_if.glink_core_if_ptr->link_down(&einfo->xprt_if); |
| |
| return 0; |
| } |
| |
| /** |
| * int wait_link_down() - Check status of read/write indices |
| * @if_ptr: The transport to check |
| * |
| * Return: 1 if indices are all zero, 0 otherwise |
| */ |
| int wait_link_down(struct glink_transport_if *if_ptr) |
| { |
| struct edge_info *einfo; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| if (einfo->tx_ch_desc->write_index == 0 && |
| einfo->tx_ch_desc->read_index == 0 && |
| einfo->rx_ch_desc->write_index == 0 && |
| einfo->rx_ch_desc->read_index == 0) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /** |
| * allocate_rx_intent() - allocate/reserve space for RX Intent |
| * @if_ptr: The transport the intent is associated with. |
| * @size: size of intent. |
| * @intent: Pointer to the intent structure. |
| * |
| * Assign "data" with the buffer created, since the transport creates |
| * a linear buffer and "iovec" with the "intent" itself, so that |
| * the data can be passed to a client that receives only vector buffer. |
| * Note that returning NULL for the pointer is valid (it means that space has |
| * been reserved, but the actual pointer will be provided later). |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int allocate_rx_intent(struct glink_transport_if *if_ptr, size_t size, |
| struct glink_core_rx_intent *intent) |
| { |
| void *t; |
| |
| t = kmalloc(size, GFP_KERNEL); |
| if (!t) |
| return -ENOMEM; |
| |
| intent->data = t; |
| intent->iovec = (void *)intent; |
| intent->vprovider = rx_linear_vbuf_provider; |
| intent->pprovider = NULL; |
| return 0; |
| } |
| |
| /** |
| * deallocate_rx_intent() - Deallocate space created for RX Intent |
| * @if_ptr: The transport the intent is associated with. |
| * @intent: Pointer to the intent structure. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int deallocate_rx_intent(struct glink_transport_if *if_ptr, |
| struct glink_core_rx_intent *intent) |
| { |
| if (!intent || !intent->data) |
| return -EINVAL; |
| |
| kfree(intent->data); |
| intent->data = NULL; |
| intent->iovec = NULL; |
| intent->vprovider = NULL; |
| return 0; |
| } |
| |
| /** |
| * tx_cmd_local_rx_intent() - convert an rx intent cmd to wire format and |
| * transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @size: The intent size to encode. |
| * @liid: The local intent id to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int tx_cmd_local_rx_intent(struct glink_transport_if *if_ptr, |
| uint32_t lcid, size_t size, uint32_t liid) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t count; |
| uint32_t size; |
| uint32_t liid; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| if (size > UINT_MAX) { |
| pr_err("%s: size %zu is too large to encode\n", __func__, size); |
| return -EMSGSIZE; |
| } |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| if (einfo->intentless) |
| return -EOPNOTSUPP; |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| cmd.id = RX_INTENT_CMD; |
| cmd.lcid = lcid; |
| cmd.count = 1; |
| cmd.size = size; |
| cmd.liid = liid; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * tx_cmd_local_rx_done() - convert an rx done cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @liid: The local intent id to encode. |
| * @reuse: Reuse the consumed intent. |
| */ |
| static void tx_cmd_local_rx_done(struct glink_transport_if *if_ptr, |
| uint32_t lcid, uint32_t liid, bool reuse) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t liid; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| if (einfo->intentless) |
| return; |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return; |
| } |
| |
| cmd.id = reuse ? RX_DONE_W_REUSE_CMD : RX_DONE_CMD; |
| cmd.lcid = lcid; |
| cmd.liid = liid; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| } |
| |
| /** |
| * tx_cmd_rx_intent_req() - convert an rx intent request cmd to wire format and |
| * transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @size: The requested intent size to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int tx_cmd_rx_intent_req(struct glink_transport_if *if_ptr, |
| uint32_t lcid, size_t size) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t size; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| if (size > UINT_MAX) { |
| pr_err("%s: size %zu is too large to encode\n", __func__, size); |
| return -EMSGSIZE; |
| } |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| if (einfo->intentless) |
| return -EOPNOTSUPP; |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| cmd.id = RX_INTENT_REQ_CMD, |
| cmd.lcid = lcid; |
| cmd.size = size; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * tx_cmd_rx_intent_req_ack() - convert an rx intent request ack cmd to wire |
| * format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @granted: The request response to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int tx_cmd_remote_rx_intent_req_ack(struct glink_transport_if *if_ptr, |
| uint32_t lcid, bool granted) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t response; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| if (einfo->intentless) |
| return -EOPNOTSUPP; |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| cmd.id = RX_INTENT_REQ_ACK_CMD, |
| cmd.lcid = lcid; |
| if (granted) |
| cmd.response = 1; |
| else |
| cmd.response = 0; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * tx_cmd_set_sigs() - convert a signals ack cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @sigs: The signals to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int tx_cmd_set_sigs(struct glink_transport_if *if_ptr, uint32_t lcid, |
| uint32_t sigs) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t sigs; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| cmd.id = SIGNALS_CMD, |
| cmd.lcid = lcid; |
| cmd.sigs = sigs; |
| |
| fifo_tx(einfo, &cmd, sizeof(cmd)); |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * poll() - poll for data on a channel |
| * @if_ptr: The transport the channel exists on. |
| * @lcid: The local channel id. |
| * |
| * Return: 0 if no data available, 1 if data available. |
| */ |
| static int poll(struct glink_transport_if *if_ptr, uint32_t lcid) |
| { |
| struct edge_info *einfo; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| if (fifo_read_avail(einfo)) { |
| __rx_worker(einfo, true); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 1; |
| } |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * mask_rx_irq() - mask the receive irq for a channel |
| * @if_ptr: The transport the channel exists on. |
| * @lcid: The local channel id for the channel. |
| * @mask: True to mask the irq, false to unmask. |
| * @pstruct: Platform defined structure for handling the masking. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int mask_rx_irq(struct glink_transport_if *if_ptr, uint32_t lcid, |
| bool mask, void *pstruct) |
| { |
| struct edge_info *einfo; |
| struct irq_chip *irq_chip; |
| struct irq_data *irq_data; |
| int rcu_id; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| irq_chip = irq_get_chip(einfo->irq_line); |
| if (!irq_chip) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -ENODEV; |
| } |
| |
| irq_data = irq_get_irq_data(einfo->irq_line); |
| if (!irq_data) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -ENODEV; |
| } |
| |
| if (mask) { |
| irq_chip->irq_mask(irq_data); |
| einfo->irq_disabled = true; |
| if (pstruct) |
| irq_set_affinity(einfo->irq_line, pstruct); |
| } else { |
| irq_chip->irq_unmask(irq_data); |
| einfo->irq_disabled = false; |
| } |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return 0; |
| } |
| |
| /** |
| * tx_data() - convert a data/tracer_pkt to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @cmd_id: The command ID to transmit. |
| * @lcid: The local channel id to encode. |
| * @pctx: The data to encode. |
| * |
| * Return: Number of bytes written or standard Linux error code. |
| */ |
| static int tx_data(struct glink_transport_if *if_ptr, uint16_t cmd_id, |
| uint32_t lcid, struct glink_core_tx_pkt *pctx) |
| { |
| struct command { |
| uint16_t id; |
| uint16_t lcid; |
| uint32_t riid; |
| uint32_t size; |
| uint32_t size_left; |
| }; |
| struct command cmd; |
| struct edge_info *einfo; |
| uint32_t size; |
| uint32_t zeros_size; |
| const void *data_start; |
| char zeros[FIFO_ALIGNMENT] = { 0 }; |
| unsigned long flags; |
| size_t tx_size = 0; |
| int rcu_id; |
| int ret; |
| |
| if (pctx->size < pctx->size_remaining) { |
| GLINK_ERR("%s: size remaining exceeds size. Resetting.\n", |
| __func__); |
| pctx->size_remaining = pctx->size; |
| } |
| if (!pctx->size_remaining) |
| return 0; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| rcu_id = srcu_read_lock(&einfo->use_ref); |
| if (einfo->in_ssr) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EFAULT; |
| } |
| |
| if (einfo->intentless && |
| (pctx->size_remaining != pctx->size || cmd_id == TRACER_PKT_CMD)) { |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EINVAL; |
| } |
| |
| if (cmd_id == TX_DATA_CMD) { |
| if (pctx->size_remaining == pctx->size) |
| cmd.id = TX_DATA_CMD; |
| else |
| cmd.id = TX_DATA_CONT_CMD; |
| } else { |
| if (pctx->size_remaining == pctx->size) |
| cmd.id = TRACER_PKT_CMD; |
| else |
| cmd.id = TRACER_PKT_CONT_CMD; |
| } |
| cmd.lcid = lcid; |
| cmd.riid = pctx->riid; |
| data_start = get_tx_vaddr(pctx, pctx->size - pctx->size_remaining, |
| &tx_size); |
| if (!data_start) { |
| GLINK_ERR("%s: invalid data_start\n", __func__); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EINVAL; |
| } |
| |
| spin_lock_irqsave(&einfo->write_lock, flags); |
| size = fifo_write_avail(einfo); |
| |
| /* Intentless clients expect a complete commit or instant failure */ |
| if (einfo->intentless && size < sizeof(cmd) + pctx->size) { |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -ENOSPC; |
| } |
| |
| /* Need enough space to write the command and some data */ |
| if (size <= sizeof(cmd)) { |
| einfo->tx_resume_needed = true; |
| send_tx_blocked_signal(einfo); |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return -EAGAIN; |
| } |
| size -= sizeof(cmd); |
| if (size > tx_size) |
| size = tx_size; |
| |
| cmd.size = size; |
| pctx->size_remaining -= size; |
| cmd.size_left = pctx->size_remaining; |
| zeros_size = ALIGN(size, FIFO_ALIGNMENT) - cmd.size; |
| if (cmd.id == TRACER_PKT_CMD) |
| tracer_pkt_log_event((void *)(pctx->data), GLINK_XPRT_TX); |
| |
| ret = fifo_write_complex(einfo, &cmd, sizeof(cmd), data_start, size, |
| zeros, zeros_size); |
| if (ret < 0) { |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return ret; |
| } |
| |
| GLINK_DBG("%s %s: lcid[%u] riid[%u] cmd[%d], size[%d], size_left[%d]\n", |
| "<SMEM>", __func__, cmd.lcid, cmd.riid, cmd.id, cmd.size, |
| cmd.size_left); |
| spin_unlock_irqrestore(&einfo->write_lock, flags); |
| |
| /* Fake tx_done for intentless since its not supported over the wire */ |
| if (einfo->intentless) { |
| spin_lock_irqsave(&einfo->rx_lock, flags); |
| cmd.id = RX_DONE_CMD; |
| cmd.lcid = pctx->rcid; |
| queue_cmd(einfo, &cmd, NULL); |
| spin_unlock_irqrestore(&einfo->rx_lock, flags); |
| } |
| |
| srcu_read_unlock(&einfo->use_ref, rcu_id); |
| return cmd.size; |
| } |
| |
| /** |
| * tx() - convert a data transmit cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @pctx: The data to encode. |
| * |
| * Return: Number of bytes written or standard Linux error code. |
| */ |
| static int tx(struct glink_transport_if *if_ptr, uint32_t lcid, |
| struct glink_core_tx_pkt *pctx) |
| { |
| return tx_data(if_ptr, TX_DATA_CMD, lcid, pctx); |
| } |
| |
| /** |
| * tx_cmd_tracer_pkt() - convert a tracer packet cmd to wire format and transmit |
| * @if_ptr: The transport to transmit on. |
| * @lcid: The local channel id to encode. |
| * @pctx: The data to encode. |
| * |
| * Return: Number of bytes written or standard Linux error code. |
| */ |
| static int tx_cmd_tracer_pkt(struct glink_transport_if *if_ptr, uint32_t lcid, |
| struct glink_core_tx_pkt *pctx) |
| { |
| return tx_data(if_ptr, TRACER_PKT_CMD, lcid, pctx); |
| } |
| |
| /** |
| * get_power_vote_ramp_time() - Get the ramp time required for the power |
| * votes to be applied |
| * @if_ptr: The transport interface on which power voting is requested. |
| * @state: The power state for which ramp time is required. |
| * |
| * Return: The ramp time specific to the power state, standard error otherwise. |
| */ |
| static unsigned long get_power_vote_ramp_time( |
| struct glink_transport_if *if_ptr, |
| uint32_t state) |
| { |
| struct edge_info *einfo; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| |
| if (state >= einfo->num_pw_states || !(einfo->ramp_time_us)) |
| return (unsigned long)ERR_PTR(-EINVAL); |
| |
| return einfo->ramp_time_us[state]; |
| } |
| |
| /** |
| * power_vote() - Update the power votes to meet qos requirement |
| * @if_ptr: The transport interface on which power voting is requested. |
| * @state: The power state for which the voting should be done. |
| * |
| * Return: 0 on Success, standard error otherwise. |
| */ |
| static int power_vote(struct glink_transport_if *if_ptr, uint32_t state) |
| { |
| return 0; |
| } |
| |
| /** |
| * power_unvote() - Remove the all the power votes |
| * @if_ptr: The transport interface on which power voting is requested. |
| * |
| * Return: 0 on Success, standard error otherwise. |
| */ |
| static int power_unvote(struct glink_transport_if *if_ptr) |
| { |
| return 0; |
| } |
| |
| /** |
| * rx_rt_vote() - Increment and RX thread RT vote |
| * @if_ptr: The transport interface on which power voting is requested. |
| * |
| * Return: 0 on Success, standard error otherwise. |
| */ |
| static int rx_rt_vote(struct glink_transport_if *if_ptr) |
| { |
| struct edge_info *einfo; |
| struct sched_param param = { .sched_priority = 1 }; |
| int ret = 0; |
| unsigned long flags; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| spin_lock_irqsave(&einfo->rt_vote_lock, flags); |
| if (!einfo->rt_votes) |
| ret = sched_setscheduler_nocheck(einfo->task, SCHED_FIFO, |
| ¶m); |
| einfo->rt_votes++; |
| spin_unlock_irqrestore(&einfo->rt_vote_lock, flags); |
| return ret; |
| } |
| |
| /** |
| * rx_rt_unvote() - Remove a RX thread RT vote |
| * @if_ptr: The transport interface on which power voting is requested. |
| * |
| * Return: 0 on Success, standard error otherwise. |
| */ |
| static int rx_rt_unvote(struct glink_transport_if *if_ptr) |
| { |
| struct edge_info *einfo; |
| struct sched_param param = { .sched_priority = 0 }; |
| int ret = 0; |
| unsigned long flags; |
| |
| einfo = container_of(if_ptr, struct edge_info, xprt_if); |
| spin_lock_irqsave(&einfo->rt_vote_lock, flags); |
| einfo->rt_votes--; |
| if (!einfo->rt_votes) |
| ret = sched_setscheduler_nocheck(einfo->task, SCHED_NORMAL, |
| ¶m); |
| spin_unlock_irqrestore(&einfo->rt_vote_lock, flags); |
| return ret; |
| } |
| |
| /** |
| * negotiate_features_v1() - determine what features of a version can be used |
| * @if_ptr: The transport for which features are negotiated for. |
| * @version: The version negotiated. |
| * @features: The set of requested features. |
| * |
| * Return: What set of the requested features can be supported. |
| */ |
| static uint32_t negotiate_features_v1(struct glink_transport_if *if_ptr, |
| const struct glink_core_version *version, |
| uint32_t features) |
| { |
| return features & version->features; |
| } |
| |
| /** |
| * init_xprt_if() - initialize the xprt_if for an edge |
| * @einfo: The edge to initialize. |
| */ |
| static void init_xprt_if(struct edge_info *einfo) |
| { |
| einfo->xprt_if.tx_cmd_version = tx_cmd_version; |
| einfo->xprt_if.tx_cmd_version_ack = tx_cmd_version_ack; |
| einfo->xprt_if.set_version = set_version; |
| einfo->xprt_if.tx_cmd_ch_open = tx_cmd_ch_open; |
| einfo->xprt_if.tx_cmd_ch_close = tx_cmd_ch_close; |
| einfo->xprt_if.tx_cmd_ch_remote_open_ack = tx_cmd_ch_remote_open_ack; |
| einfo->xprt_if.tx_cmd_ch_remote_close_ack = tx_cmd_ch_remote_close_ack; |
| einfo->xprt_if.ssr = ssr; |
| einfo->xprt_if.allocate_rx_intent = allocate_rx_intent; |
| einfo->xprt_if.deallocate_rx_intent = deallocate_rx_intent; |
| einfo->xprt_if.tx_cmd_local_rx_intent = tx_cmd_local_rx_intent; |
| einfo->xprt_if.tx_cmd_local_rx_done = tx_cmd_local_rx_done; |
| einfo->xprt_if.tx = tx; |
| einfo->xprt_if.tx_cmd_rx_intent_req = tx_cmd_rx_intent_req; |
| einfo->xprt_if.tx_cmd_remote_rx_intent_req_ack = |
| tx_cmd_remote_rx_intent_req_ack; |
| einfo->xprt_if.tx_cmd_set_sigs = tx_cmd_set_sigs; |
| einfo->xprt_if.poll = poll; |
| einfo->xprt_if.mask_rx_irq = mask_rx_irq; |
| einfo->xprt_if.wait_link_down = wait_link_down; |
| einfo->xprt_if.tx_cmd_tracer_pkt = tx_cmd_tracer_pkt; |
| einfo->xprt_if.get_power_vote_ramp_time = get_power_vote_ramp_time; |
| einfo->xprt_if.power_vote = power_vote; |
| einfo->xprt_if.power_unvote = power_unvote; |
| einfo->xprt_if.rx_rt_vote = rx_rt_vote; |
| einfo->xprt_if.rx_rt_unvote = rx_rt_unvote; |
| } |
| |
| /** |
| * init_xprt_cfg() - initialize the xprt_cfg for an edge |
| * @einfo: The edge to initialize. |
| * @name: The name of the remote side this edge communicates to. |
| */ |
| static void init_xprt_cfg(struct edge_info *einfo, const char *name) |
| { |
| einfo->xprt_cfg.name = XPRT_NAME; |
| einfo->xprt_cfg.edge = name; |
| einfo->xprt_cfg.versions = versions; |
| einfo->xprt_cfg.versions_entries = ARRAY_SIZE(versions); |
| einfo->xprt_cfg.max_cid = SZ_64K; |
| einfo->xprt_cfg.max_iid = SZ_2G; |
| } |
| |
| /** |
| * parse_qos_dt_params() - Parse the power states from DT |
| * @dev: Reference to the platform device for a specific edge. |
| * @einfo: Edge information for the edge probe function is called. |
| * |
| * Return: 0 on success, standard error code otherwise. |
| */ |
| static int parse_qos_dt_params(struct device_node *node, |
| struct edge_info *einfo) |
| { |
| int rc; |
| int i; |
| char *key; |
| uint32_t *arr32; |
| uint32_t num_states; |
| |
| key = "qcom,ramp-time"; |
| if (!of_find_property(node, key, &num_states)) |
| return -ENODEV; |
| |
| num_states /= sizeof(uint32_t); |
| |
| einfo->num_pw_states = num_states; |
| |
| arr32 = kmalloc_array(num_states, sizeof(uint32_t), GFP_KERNEL); |
| if (!arr32) |
| return -ENOMEM; |
| |
| einfo->ramp_time_us = kmalloc_array(num_states, sizeof(unsigned long), |
| GFP_KERNEL); |
| if (!einfo->ramp_time_us) { |
| rc = -ENOMEM; |
| goto mem_alloc_fail; |
| } |
| |
| rc = of_property_read_u32_array(node, key, arr32, num_states); |
| if (rc) { |
| rc = -ENODEV; |
| goto invalid_key; |
| } |
| for (i = 0; i < num_states; i++) |
| einfo->ramp_time_us[i] = arr32[i]; |
| |
| rc = 0; |
| kfree(arr32); |
| return rc; |
| |
| invalid_key: |
| kfree(einfo->ramp_time_us); |
| mem_alloc_fail: |
| kfree(arr32); |
| return rc; |
| } |
| |
| /** |
| * subsys_name_to_id() - translate a subsystem name to a processor id |
| * @name: The subsystem name to look up. |
| * |
| * Return: The processor id corresponding to @name or standard Linux error code. |
| */ |
| static int subsys_name_to_id(const char *name) |
| { |
| if (!name) |
| return -ENODEV; |
| |
| if (!strcmp(name, "apss")) |
| return SMEM_APPS; |
| if (!strcmp(name, "dsps")) |
| return SMEM_DSPS; |
| if (!strcmp(name, "lpass")) |
| return SMEM_Q6; |
| if (!strcmp(name, "mpss")) |
| return SMEM_MODEM; |
| if (!strcmp(name, "rpm")) |
| return SMEM_RPM; |
| if (!strcmp(name, "wcnss")) |
| return SMEM_WCNSS; |
| if (!strcmp(name, "spss")) |
| return SMEM_SPSS; |
| if (!strcmp(name, "cdsp")) |
| return SMEM_CDSP; |
| return -ENODEV; |
| } |
| |
| static void glink_set_affinity(struct edge_info *einfo, u32 *arr, size_t size) |
| { |
| struct cpumask cpumask; |
| pid_t pid; |
| int i; |
| |
| cpumask_clear(&cpumask); |
| for (i = 0; i < size; i++) { |
| if (arr[i] < num_possible_cpus()) |
| cpumask_set_cpu(arr[i], &cpumask); |
| } |
| if (irq_set_affinity(einfo->irq_line, &cpumask)) |
| pr_err("%s: Failed to set irq affinity\n", __func__); |
| |
| if (sched_setaffinity(einfo->task->pid, &cpumask)) |
| pr_err("%s: Failed to set rx cpu affinity\n", __func__); |
| |
| pid = einfo->xprt_cfg.tx_task->pid; |
| if (sched_setaffinity(pid, &cpumask)) |
| pr_err("%s: Failed to set tx cpu affinity\n", __func__); |
| } |
| |
| static int glink_smem_native_probe(struct platform_device *pdev) |
| { |
| struct device_node *node; |
| struct device_node *phandle_node; |
| struct edge_info *einfo; |
| int rc, cpu_size; |
| char *key; |
| const char *subsys_name; |
| uint32_t irq_line; |
| uint32_t irq_mask; |
| struct resource *r; |
| u32 *cpu_array; |
| |
| node = pdev->dev.of_node; |
| |
| einfo = kzalloc(sizeof(*einfo), GFP_KERNEL); |
| if (!einfo) { |
| rc = -ENOMEM; |
| goto edge_info_alloc_fail; |
| } |
| |
| key = "label"; |
| subsys_name = of_get_property(node, key, NULL); |
| if (!subsys_name) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "interrupts"; |
| irq_line = irq_of_parse_and_map(node, 0); |
| if (!irq_line) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "qcom,irq-mask"; |
| rc = of_property_read_u32(node, key, &irq_mask); |
| if (rc) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "irq-reg-base"; |
| r = platform_get_resource_byname(pdev, IORESOURCE_MEM, key); |
| if (!r) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| if (subsys_name_to_id(subsys_name) == -ENODEV) { |
| pr_err("%s: unknown subsystem: %s\n", __func__, subsys_name); |
| rc = -ENODEV; |
| goto invalid_key; |
| } |
| einfo->remote_proc_id = subsys_name_to_id(subsys_name); |
| |
| init_xprt_cfg(einfo, subsys_name); |
| init_xprt_if(einfo); |
| spin_lock_init(&einfo->write_lock); |
| init_waitqueue_head(&einfo->tx_blocked_queue); |
| kthread_init_work(&einfo->kwork, rx_worker); |
| kthread_init_worker(&einfo->kworker); |
| tasklet_init(&einfo->tasklet, rx_worker_atomic, (unsigned long)einfo); |
| einfo->read_from_fifo = read_from_fifo; |
| einfo->write_to_fifo = write_to_fifo; |
| init_srcu_struct(&einfo->use_ref); |
| spin_lock_init(&einfo->rx_lock); |
| INIT_LIST_HEAD(&einfo->deferred_cmds); |
| spin_lock_init(&einfo->rt_vote_lock); |
| einfo->rt_votes = 0; |
| |
| mutex_lock(&probe_lock); |
| if (edge_infos[einfo->remote_proc_id]) { |
| pr_err("%s: duplicate subsys %s is not valid\n", __func__, |
| subsys_name); |
| rc = -ENODEV; |
| mutex_unlock(&probe_lock); |
| goto invalid_key; |
| } |
| edge_infos[einfo->remote_proc_id] = einfo; |
| mutex_unlock(&probe_lock); |
| |
| einfo->out_irq_mask = irq_mask; |
| einfo->out_irq_reg = ioremap_nocache(r->start, resource_size(r)); |
| if (!einfo->out_irq_reg) { |
| pr_err("%s: unable to map irq reg\n", __func__); |
| rc = -ENOMEM; |
| goto ioremap_fail; |
| } |
| |
| einfo->task = kthread_run(kthread_worker_fn, &einfo->kworker, |
| "smem_native_%s", subsys_name); |
| if (IS_ERR(einfo->task)) { |
| rc = PTR_ERR(einfo->task); |
| pr_err("%s: kthread_run failed %d\n", __func__, rc); |
| goto kthread_fail; |
| } |
| |
| einfo->tx_ch_desc = smem_alloc(SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, |
| SMEM_CH_DESC_SIZE, |
| einfo->remote_proc_id, |
| 0); |
| if (PTR_ERR(einfo->tx_ch_desc) == -EPROBE_DEFER) { |
| rc = -EPROBE_DEFER; |
| goto smem_alloc_fail; |
| } |
| if (!einfo->tx_ch_desc) { |
| pr_err("%s: smem alloc of ch descriptor failed\n", __func__); |
| rc = -ENOMEM; |
| goto smem_alloc_fail; |
| } |
| einfo->rx_ch_desc = einfo->tx_ch_desc + 1; |
| |
| einfo->tx_fifo_size = SZ_16K; |
| einfo->tx_fifo = smem_alloc(SMEM_GLINK_NATIVE_XPRT_FIFO_0, |
| einfo->tx_fifo_size, |
| einfo->remote_proc_id, |
| 0); |
| if (!einfo->tx_fifo) { |
| pr_err("%s: smem alloc of tx fifo failed\n", __func__); |
| rc = -ENOMEM; |
| goto smem_alloc_fail; |
| } |
| |
| key = "qcom,qos-config"; |
| phandle_node = of_parse_phandle(node, key, 0); |
| if (phandle_node && !(of_get_glink_core_qos_cfg(phandle_node, |
| &einfo->xprt_cfg))) |
| parse_qos_dt_params(node, einfo); |
| |
| rc = glink_core_register_transport(&einfo->xprt_if, &einfo->xprt_cfg); |
| if (rc == -EPROBE_DEFER) |
| goto reg_xprt_fail; |
| if (rc) { |
| pr_err("%s: glink core register transport failed: %d\n", |
| __func__, rc); |
| goto reg_xprt_fail; |
| } |
| |
| einfo->irq_line = irq_line; |
| rc = request_irq(irq_line, irq_handler, |
| IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND | IRQF_SHARED, |
| node->name, einfo); |
| if (rc < 0) { |
| pr_err("%s: request_irq on %d failed: %d\n", __func__, irq_line, |
| rc); |
| goto request_irq_fail; |
| } |
| rc = enable_irq_wake(irq_line); |
| if (rc < 0) |
| pr_err("%s: enable_irq_wake() failed on %d\n", __func__, |
| irq_line); |
| |
| key = "cpu-affinity"; |
| cpu_size = of_property_count_u32_elems(node, key); |
| if (cpu_size > 0) { |
| cpu_array = kmalloc_array(cpu_size, sizeof(u32), GFP_KERNEL); |
| if (!cpu_array) { |
| rc = -ENOMEM; |
| goto request_irq_fail; |
| } |
| rc = of_property_read_u32_array(node, key, cpu_array, cpu_size); |
| if (!rc) |
| glink_set_affinity(einfo, cpu_array, cpu_size); |
| kfree(cpu_array); |
| } |
| |
| register_debugfs_info(einfo); |
| /* fake an interrupt on this edge to see if the remote side is up */ |
| irq_handler(0, einfo); |
| return 0; |
| |
| request_irq_fail: |
| glink_core_unregister_transport(&einfo->xprt_if); |
| reg_xprt_fail: |
| smem_alloc_fail: |
| kthread_flush_worker(&einfo->kworker); |
| kthread_stop(einfo->task); |
| einfo->task = NULL; |
| tasklet_kill(&einfo->tasklet); |
| kthread_fail: |
| iounmap(einfo->out_irq_reg); |
| ioremap_fail: |
| mutex_lock(&probe_lock); |
| edge_infos[einfo->remote_proc_id] = NULL; |
| mutex_unlock(&probe_lock); |
| invalid_key: |
| missing_key: |
| kfree(einfo); |
| edge_info_alloc_fail: |
| return rc; |
| } |
| |
| static int glink_rpm_native_probe(struct platform_device *pdev) |
| { |
| struct device_node *node; |
| struct edge_info *einfo; |
| int rc; |
| char *key; |
| const char *subsys_name; |
| uint32_t irq_line; |
| uint32_t irq_mask; |
| struct resource *irq_r; |
| struct resource *msgram_r; |
| void __iomem *msgram; |
| char toc[RPM_TOC_SIZE]; |
| uint32_t *tocp; |
| uint32_t num_toc_entries; |
| |
| node = pdev->dev.of_node; |
| |
| einfo = kzalloc(sizeof(*einfo), GFP_KERNEL); |
| if (!einfo) { |
| rc = -ENOMEM; |
| goto edge_info_alloc_fail; |
| } |
| |
| subsys_name = "rpm"; |
| |
| key = "interrupts"; |
| irq_line = irq_of_parse_and_map(node, 0); |
| if (!irq_line) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "qcom,irq-mask"; |
| rc = of_property_read_u32(node, key, &irq_mask); |
| if (rc) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "irq-reg-base"; |
| irq_r = platform_get_resource_byname(pdev, IORESOURCE_MEM, key); |
| if (!irq_r) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "msgram"; |
| msgram_r = platform_get_resource_byname(pdev, IORESOURCE_MEM, key); |
| if (!msgram_r) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| if (subsys_name_to_id(subsys_name) == -ENODEV) { |
| pr_err("%s: unknown subsystem: %s\n", __func__, subsys_name); |
| rc = -ENODEV; |
| goto invalid_key; |
| } |
| einfo->remote_proc_id = subsys_name_to_id(subsys_name); |
| |
| init_xprt_cfg(einfo, subsys_name); |
| init_xprt_if(einfo); |
| spin_lock_init(&einfo->write_lock); |
| init_waitqueue_head(&einfo->tx_blocked_queue); |
| kthread_init_work(&einfo->kwork, rx_worker); |
| kthread_init_worker(&einfo->kworker); |
| tasklet_init(&einfo->tasklet, rx_worker_atomic, (unsigned long)einfo); |
| einfo->intentless = true; |
| einfo->read_from_fifo = memcpy32_fromio; |
| einfo->write_to_fifo = memcpy32_toio; |
| init_srcu_struct(&einfo->use_ref); |
| spin_lock_init(&einfo->rx_lock); |
| INIT_LIST_HEAD(&einfo->deferred_cmds); |
| |
| mutex_lock(&probe_lock); |
| if (edge_infos[einfo->remote_proc_id]) { |
| pr_err("%s: duplicate subsys %s is not valid\n", __func__, |
| subsys_name); |
| rc = -ENODEV; |
| mutex_unlock(&probe_lock); |
| goto invalid_key; |
| } |
| edge_infos[einfo->remote_proc_id] = einfo; |
| mutex_unlock(&probe_lock); |
| |
| einfo->out_irq_mask = irq_mask; |
| einfo->out_irq_reg = ioremap_nocache(irq_r->start, |
| resource_size(irq_r)); |
| if (!einfo->out_irq_reg) { |
| pr_err("%s: unable to map irq reg\n", __func__); |
| rc = -ENOMEM; |
| goto irq_ioremap_fail; |
| } |
| |
| msgram = ioremap_nocache(msgram_r->start, resource_size(msgram_r)); |
| if (!msgram) { |
| pr_err("%s: unable to map msgram\n", __func__); |
| rc = -ENOMEM; |
| goto msgram_ioremap_fail; |
| } |
| |
| einfo->task = kthread_run(kthread_worker_fn, &einfo->kworker, |
| "smem_native_%s", subsys_name); |
| if (IS_ERR(einfo->task)) { |
| rc = PTR_ERR(einfo->task); |
| pr_err("%s: kthread_run failed %d\n", __func__, rc); |
| goto kthread_fail; |
| } |
| |
| memcpy32_fromio(toc, msgram + resource_size(msgram_r) - RPM_TOC_SIZE, |
| RPM_TOC_SIZE); |
| tocp = (uint32_t *)toc; |
| if (*tocp != RPM_TOC_ID) { |
| rc = -ENODEV; |
| pr_err("%s: TOC id %d is not valid\n", __func__, *tocp); |
| goto toc_init_fail; |
| } |
| ++tocp; |
| num_toc_entries = *tocp; |
| if (num_toc_entries > RPM_MAX_TOC_ENTRIES) { |
| rc = -ENODEV; |
| pr_err("%s: %d is too many toc entries\n", __func__, |
| num_toc_entries); |
| goto toc_init_fail; |
| } |
| ++tocp; |
| |
| for (rc = 0; rc < num_toc_entries; ++rc) { |
| if (*tocp != RPM_TX_FIFO_ID) { |
| tocp += 3; |
| continue; |
| } |
| ++tocp; |
| einfo->tx_ch_desc = msgram + *tocp; |
| einfo->tx_fifo = einfo->tx_ch_desc + 1; |
| if ((uintptr_t)einfo->tx_fifo > |
| (uintptr_t)(msgram + resource_size(msgram_r))) { |
| pr_err("%s: invalid tx fifo address\n", __func__); |
| einfo->tx_fifo = NULL; |
| break; |
| } |
| ++tocp; |
| einfo->tx_fifo_size = *tocp; |
| if (einfo->tx_fifo_size > resource_size(msgram_r) || |
| (uintptr_t)(einfo->tx_fifo + einfo->tx_fifo_size) > |
| (uintptr_t)(msgram + resource_size(msgram_r))) { |
| pr_err("%s: invalid tx fifo size\n", __func__); |
| einfo->tx_fifo = NULL; |
| break; |
| } |
| break; |
| } |
| if (!einfo->tx_fifo) { |
| rc = -ENODEV; |
| pr_err("%s: tx fifo not found\n", __func__); |
| goto toc_init_fail; |
| } |
| |
| tocp = (uint32_t *)toc; |
| tocp += 2; |
| for (rc = 0; rc < num_toc_entries; ++rc) { |
| if (*tocp != RPM_RX_FIFO_ID) { |
| tocp += 3; |
| continue; |
| } |
| ++tocp; |
| einfo->rx_ch_desc = msgram + *tocp; |
| einfo->rx_fifo = einfo->rx_ch_desc + 1; |
| if ((uintptr_t)einfo->rx_fifo > |
| (uintptr_t)(msgram + resource_size(msgram_r))) { |
| pr_err("%s: invalid rx fifo address\n", __func__); |
| einfo->rx_fifo = NULL; |
| break; |
| } |
| ++tocp; |
| einfo->rx_fifo_size = *tocp; |
| if (einfo->rx_fifo_size > resource_size(msgram_r) || |
| (uintptr_t)(einfo->rx_fifo + einfo->rx_fifo_size) > |
| (uintptr_t)(msgram + resource_size(msgram_r))) { |
| pr_err("%s: invalid rx fifo size\n", __func__); |
| einfo->rx_fifo = NULL; |
| break; |
| } |
| break; |
| } |
| if (!einfo->rx_fifo) { |
| rc = -ENODEV; |
| pr_err("%s: rx fifo not found\n", __func__); |
| goto toc_init_fail; |
| } |
| |
| einfo->tx_ch_desc->write_index = 0; |
| einfo->rx_ch_desc->read_index = 0; |
| |
| rc = glink_core_register_transport(&einfo->xprt_if, &einfo->xprt_cfg); |
| if (rc == -EPROBE_DEFER) |
| goto reg_xprt_fail; |
| if (rc) { |
| pr_err("%s: glink core register transport failed: %d\n", |
| __func__, rc); |
| goto reg_xprt_fail; |
| } |
| |
| einfo->irq_line = irq_line; |
| rc = request_irq(irq_line, irq_handler, |
| IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND | IRQF_SHARED, |
| node->name, einfo); |
| if (rc < 0) { |
| pr_err("%s: request_irq on %d failed: %d\n", __func__, irq_line, |
| rc); |
| goto request_irq_fail; |
| } |
| rc = enable_irq_wake(irq_line); |
| if (rc < 0) |
| pr_err("%s: enable_irq_wake() failed on %d\n", __func__, |
| irq_line); |
| |
| register_debugfs_info(einfo); |
| einfo->xprt_if.glink_core_if_ptr->link_up(&einfo->xprt_if); |
| return 0; |
| |
| request_irq_fail: |
| glink_core_unregister_transport(&einfo->xprt_if); |
| reg_xprt_fail: |
| toc_init_fail: |
| kthread_flush_worker(&einfo->kworker); |
| kthread_stop(einfo->task); |
| einfo->task = NULL; |
| tasklet_kill(&einfo->tasklet); |
| kthread_fail: |
| iounmap(msgram); |
| msgram_ioremap_fail: |
| iounmap(einfo->out_irq_reg); |
| irq_ioremap_fail: |
| mutex_lock(&probe_lock); |
| edge_infos[einfo->remote_proc_id] = NULL; |
| mutex_unlock(&probe_lock); |
| invalid_key: |
| missing_key: |
| kfree(einfo); |
| edge_info_alloc_fail: |
| return rc; |
| } |
| |
| static int glink_mailbox_probe(struct platform_device *pdev) |
| { |
| struct device_node *node; |
| struct edge_info *einfo; |
| int rc; |
| char *key; |
| const char *subsys_name; |
| uint32_t irq_line; |
| uint32_t irq_mask; |
| struct resource *irq_r; |
| struct resource *mbox_loc_r; |
| struct resource *mbox_size_r; |
| struct resource *rx_reset_r; |
| void *mbox_loc; |
| void *mbox_size; |
| struct mailbox_config_info *mbox_cfg; |
| uint32_t mbox_cfg_size; |
| phys_addr_t cfg_p_addr; |
| |
| node = pdev->dev.of_node; |
| |
| einfo = kzalloc(sizeof(*einfo), GFP_KERNEL); |
| if (!einfo) { |
| rc = -ENOMEM; |
| goto edge_info_alloc_fail; |
| } |
| |
| key = "label"; |
| subsys_name = of_get_property(node, key, NULL); |
| if (!subsys_name) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "interrupts"; |
| irq_line = irq_of_parse_and_map(node, 0); |
| if (!irq_line) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "qcom,irq-mask"; |
| rc = of_property_read_u32(node, key, &irq_mask); |
| if (rc) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "irq-reg-base"; |
| irq_r = platform_get_resource_byname(pdev, IORESOURCE_MEM, key); |
| if (!irq_r) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "mbox-loc-addr"; |
| mbox_loc_r = platform_get_resource_byname(pdev, IORESOURCE_MEM, key); |
| if (!mbox_loc_r) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "mbox-loc-size"; |
| mbox_size_r = platform_get_resource_byname(pdev, IORESOURCE_MEM, key); |
| if (!mbox_size_r) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "irq-rx-reset"; |
| rx_reset_r = platform_get_resource_byname(pdev, IORESOURCE_MEM, key); |
| if (!rx_reset_r) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "qcom,tx-ring-size"; |
| rc = of_property_read_u32(node, key, &einfo->tx_fifo_size); |
| if (rc) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| key = "qcom,rx-ring-size"; |
| rc = of_property_read_u32(node, key, &einfo->rx_fifo_size); |
| if (rc) { |
| pr_err("%s: missing key %s\n", __func__, key); |
| rc = -ENODEV; |
| goto missing_key; |
| } |
| |
| if (subsys_name_to_id(subsys_name) == -ENODEV) { |
| pr_err("%s: unknown subsystem: %s\n", __func__, subsys_name); |
| rc = -ENODEV; |
| goto invalid_key; |
| } |
| einfo->remote_proc_id = subsys_name_to_id(subsys_name); |
| |
| init_xprt_cfg(einfo, subsys_name); |
| einfo->xprt_cfg.name = "mailbox"; |
| init_xprt_if(einfo); |
| spin_lock_init(&einfo->write_lock); |
| init_waitqueue_head(&einfo->tx_blocked_queue); |
| kthread_init_work(&einfo->kwork, rx_worker); |
| kthread_init_worker(&einfo->kworker); |
| tasklet_init(&einfo->tasklet, rx_worker_atomic, (unsigned long)einfo); |
| einfo->read_from_fifo = read_from_fifo; |
| einfo->write_to_fifo = write_to_fifo; |
| init_srcu_struct(&einfo->use_ref); |
| spin_lock_init(&einfo->rx_lock); |
| INIT_LIST_HEAD(&einfo->deferred_cmds); |
| |
| mutex_lock(&probe_lock); |
| if (edge_infos[einfo->remote_proc_id]) { |
| pr_err("%s: duplicate subsys %s is not valid\n", __func__, |
| subsys_name); |
| rc = -ENODEV; |
| mutex_unlock(&probe_lock); |
| goto invalid_key; |
| } |
| edge_infos[einfo->remote_proc_id] = einfo; |
| mutex_unlock(&probe_lock); |
| |
| einfo->out_irq_mask = irq_mask; |
| einfo->out_irq_reg = ioremap_nocache(irq_r->start, |
| resource_size(irq_r)); |
| if (!einfo->out_irq_reg) { |
| pr_err("%s: unable to map irq reg\n", __func__); |
| rc = -ENOMEM; |
| goto irq_ioremap_fail; |
| } |
| |
| mbox_loc = ioremap_nocache(mbox_loc_r->start, |
| resource_size(mbox_loc_r)); |
| if (!mbox_loc) { |
| pr_err("%s: unable to map mailbox location reg\n", __func__); |
| rc = -ENOMEM; |
| goto mbox_loc_ioremap_fail; |
| } |
| |
| mbox_size = ioremap_nocache(mbox_size_r->start, |
| resource_size(mbox_size_r)); |
| if (!mbox_size) { |
| pr_err("%s: unable to map mailbox size reg\n", __func__); |
| rc = -ENOMEM; |
| goto mbox_size_ioremap_fail; |
| } |
| |
| einfo->rx_reset_reg = ioremap_nocache(rx_reset_r->start, |
| resource_size(rx_reset_r)); |
| if (!einfo->rx_reset_reg) { |
| pr_err("%s: unable to map rx reset reg\n", __func__); |
| rc = -ENOMEM; |
| goto rx_reset_ioremap_fail; |
| } |
| |
| einfo->task = kthread_run(kthread_worker_fn, &einfo->kworker, |
| "smem_native_%s", subsys_name); |
| if (IS_ERR(einfo->task)) { |
| rc = PTR_ERR(einfo->task); |
| pr_err("%s: kthread_run failed %d\n", __func__, rc); |
| goto kthread_fail; |
| } |
| |
| mbox_cfg_size = sizeof(*mbox_cfg) + einfo->tx_fifo_size + |
| einfo->rx_fifo_size; |
| mbox_cfg = smem_alloc(SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, |
| mbox_cfg_size, |
| einfo->remote_proc_id, |
| 0); |
| if (PTR_ERR(mbox_cfg) == -EPROBE_DEFER) { |
| rc = -EPROBE_DEFER; |
| goto smem_alloc_fail; |
| } |
| if (!mbox_cfg) { |
| pr_err("%s: smem alloc of mailbox struct failed\n", __func__); |
| rc = -ENOMEM; |
| goto smem_alloc_fail; |
| } |
| einfo->mailbox = mbox_cfg; |
| einfo->tx_ch_desc = (struct channel_desc *)(&mbox_cfg->tx_read_index); |
| einfo->rx_ch_desc = (struct channel_desc *)(&mbox_cfg->rx_read_index); |
| mbox_cfg->tx_size = einfo->tx_fifo_size; |
| mbox_cfg->rx_size = einfo->rx_fifo_size; |
| einfo->tx_fifo = &mbox_cfg->fifo[0]; |
| |
| rc = glink_core_register_transport(&einfo->xprt_if, &einfo->xprt_cfg); |
| if (rc == -EPROBE_DEFER) |
| goto reg_xprt_fail; |
| if (rc) { |
| pr_err("%s: glink core register transport failed: %d\n", |
| __func__, rc); |
| goto reg_xprt_fail; |
| } |
| |
| einfo->irq_line = irq_line; |
| rc = request_irq(irq_line, irq_handler, |
| IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND | IRQF_SHARED, |
| node->name, einfo); |
| if (rc < 0) { |
| pr_err("%s: request_irq on %d failed: %d\n", __func__, irq_line, |
| rc); |
| goto request_irq_fail; |
| } |
| rc = enable_irq_wake(irq_line); |
| if (rc < 0) |
| pr_err("%s: enable_irq_wake() failed on %d\n", __func__, |
| irq_line); |
| |
| register_debugfs_info(einfo); |
| |
| writel_relaxed(mbox_cfg_size, mbox_size); |
| cfg_p_addr = smem_virt_to_phys(mbox_cfg); |
| writel_relaxed(lower_32_bits(cfg_p_addr), mbox_loc); |
| writel_relaxed(upper_32_bits(cfg_p_addr), mbox_loc + 4); |
| send_irq(einfo); |
| iounmap(mbox_size); |
| iounmap(mbox_loc); |
| return 0; |
| |
| request_irq_fail: |
| glink_core_unregister_transport(&einfo->xprt_if); |
| reg_xprt_fail: |
| smem_alloc_fail: |
| kthread_flush_worker(&einfo->kworker); |
| kthread_stop(einfo->task); |
| einfo->task = NULL; |
| tasklet_kill(&einfo->tasklet); |
| kthread_fail: |
| iounmap(einfo->rx_reset_reg); |
| rx_reset_ioremap_fail: |
| iounmap(mbox_size); |
| mbox_size_ioremap_fail: |
| iounmap(mbox_loc); |
| mbox_loc_ioremap_fail: |
| iounmap(einfo->out_irq_reg); |
| irq_ioremap_fail: |
| mutex_lock(&probe_lock); |
| edge_infos[einfo->remote_proc_id] = NULL; |
| mutex_unlock(&probe_lock); |
| invalid_key: |
| missing_key: |
| kfree(einfo); |
| edge_info_alloc_fail: |
| return rc; |
| } |
| |
| #if defined(CONFIG_DEBUG_FS) |
| /** |
| * debug_edge() - generates formatted text output displaying current edge state |
| * @s: File to send the output to. |
| */ |
| static void debug_edge(struct seq_file *s) |
| { |
| struct edge_info *einfo; |
| struct glink_dbgfs_data *dfs_d; |
| |
| dfs_d = s->private; |
| einfo = dfs_d->priv_data; |
| |
| /* |
| * formatted, human readable edge state output, ie: |
| * TX/RX fifo information: |
| ID|EDGE |TX READ |TX WRITE |TX SIZE |RX READ |RX WRITE |RX SIZE |
| ------------------------------------------------------------------------------- |
| 01|mpss |0x00000128|0x00000128|0x00000800|0x00000256|0x00000256|0x00001000 |
| * |
| * Interrupt information: |
| * EDGE |TX INT |RX INT |
| * -------------------------------- |
| * mpss |0x00000006|0x00000008 |
| */ |
| seq_puts(s, "TX/RX fifo information:\n"); |
| seq_printf(s, "%2s|%-10s|%-10s|%-10s|%-10s|%-10s|%-10s|%-10s\n", |
| "ID", |
| "EDGE", |
| "TX READ", |
| "TX WRITE", |
| "TX SIZE", |
| "RX READ", |
| "RX WRITE", |
| "RX SIZE"); |
| seq_puts(s, |
| "-------------------------------------------------------------------------------\n"); |
| if (!einfo) |
| return; |
| |
| seq_printf(s, "%02i|%-10s|", einfo->remote_proc_id, |
| einfo->xprt_cfg.edge); |
| if (!einfo->rx_fifo) |
| seq_puts(s, "Link Not Up\n"); |
| else |
| seq_printf(s, "0x%08X|0x%08X|0x%08X|0x%08X|0x%08X|0x%08X\n", |
| einfo->tx_ch_desc->read_index, |
| einfo->tx_ch_desc->write_index, |
| einfo->tx_fifo_size, |
| einfo->rx_ch_desc->read_index, |
| einfo->rx_ch_desc->write_index, |
| einfo->rx_fifo_size); |
| |
| seq_puts(s, "\nInterrupt information:\n"); |
| seq_printf(s, "%-10s|%-10s|%-10s\n", "EDGE", "TX INT", "RX INT"); |
| seq_puts(s, "--------------------------------\n"); |
| seq_printf(s, "%-10s|0x%08X|0x%08X\n", einfo->xprt_cfg.edge, |
| einfo->tx_irq_count, |
| einfo->rx_irq_count); |
| } |
| |
| /** |
| * register_debugfs_info() - initialize debugfs device entries |
| * @einfo: Pointer to specific edge_info for which register is called. |
| */ |
| static void register_debugfs_info(struct edge_info *einfo) |
| { |
| struct glink_dbgfs dfs; |
| char *curr_dir_name; |
| int dir_name_len; |
| |
| dir_name_len = strlen(einfo->xprt_cfg.edge) + |
| strlen(einfo->xprt_cfg.name) + 2; |
| curr_dir_name = kmalloc(dir_name_len, GFP_KERNEL); |
| if (!curr_dir_name) { |
| GLINK_ERR("%s: Memory allocation failed\n", __func__); |
| return; |
| } |
| |
| snprintf(curr_dir_name, dir_name_len, "%s_%s", |
| einfo->xprt_cfg.edge, einfo->xprt_cfg.name); |
| dfs.curr_name = curr_dir_name; |
| dfs.par_name = "xprt"; |
| dfs.b_dir_create = false; |
| glink_debugfs_create("XPRT_INFO", debug_edge, |
| &dfs, einfo, false); |
| kfree(curr_dir_name); |
| } |
| |
| #else |
| static void register_debugfs_info(struct edge_info *einfo) |
| { |
| } |
| #endif /* CONFIG_DEBUG_FS */ |
| |
| static const struct of_device_id smem_match_table[] = { |
| { .compatible = "qcom,glink-smem-native-xprt" }, |
| {}, |
| }; |
| |
| static struct platform_driver glink_smem_native_driver = { |
| .probe = glink_smem_native_probe, |
| .driver = { |
| .name = "msm_glink_smem_native_xprt", |
| .owner = THIS_MODULE, |
| .of_match_table = smem_match_table, |
| }, |
| }; |
| |
| static const struct of_device_id rpm_match_table[] = { |
| { .compatible = "qcom,glink-rpm-native-xprt" }, |
| {}, |
| }; |
| |
| static struct platform_driver glink_rpm_native_driver = { |
| .probe = glink_rpm_native_probe, |
| .driver = { |
| .name = "msm_glink_rpm_native_xprt", |
| .owner = THIS_MODULE, |
| .of_match_table = rpm_match_table, |
| }, |
| }; |
| |
| static const struct of_device_id mailbox_match_table[] = { |
| { .compatible = "qcom,glink-mailbox-xprt" }, |
| {}, |
| }; |
| |
| static struct platform_driver glink_mailbox_driver = { |
| .probe = glink_mailbox_probe, |
| .driver = { |
| .name = "msm_glink_mailbox_xprt", |
| .owner = THIS_MODULE, |
| .of_match_table = mailbox_match_table, |
| }, |
| }; |
| |
| static int __init glink_smem_native_xprt_init(void) |
| { |
| int rc; |
| |
| rc = platform_driver_register(&glink_smem_native_driver); |
| if (rc) { |
| pr_err("%s: glink_smem_native_driver register failed %d\n", |
| __func__, rc); |
| return rc; |
| } |
| |
| rc = platform_driver_register(&glink_rpm_native_driver); |
| if (rc) { |
| pr_err("%s: glink_rpm_native_driver register failed %d\n", |
| __func__, rc); |
| return rc; |
| } |
| |
| rc = platform_driver_register(&glink_mailbox_driver); |
| if (rc) { |
| pr_err("%s: glink_mailbox_driver register failed %d\n", |
| __func__, rc); |
| return rc; |
| } |
| |
| return 0; |
| } |
| arch_initcall(glink_smem_native_xprt_init); |
| |
| MODULE_DESCRIPTION("MSM G-Link SMEM Native Transport"); |
| MODULE_LICENSE("GPL v2"); |