/* * Thunderbolt Cactus Ridge driver - control channel and configuration commands * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> */ #include <linux/crc32.h>#include <linux/delay.h>#include <linux/slab.h>#include <linux/pci.h>#include <linux/dmapool.h>#include <linux/workqueue.h> #include "ctl.h" #define TB_CTL_RX_PKG_COUNT 10#define TB_CTL_RETRIES 4 /** * struct tb_cfg - thunderbolt control channel */struct tb_ctl { struct tb_nhi *nhi; struct tb_ring *tx; struct tb_ring *rx; struct dma_pool *frame_pool; struct ctl_pkg *rx_packets[TB_CTL_RX_PKG_COUNT]; struct mutex request_queue_lock; struct list_head request_queue; bool running; event_cb callback; void *callback_data;}; #define tb_ctl_WARN(ctl, format, arg...) \ dev_WARN(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_err(ctl, format, arg...) \ dev_err(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_warn(ctl, format, arg...) \ dev_warn(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_info(ctl, format, arg...) \ dev_info(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_dbg(ctl, format, arg...) \ dev_dbg(&(ctl)->nhi->pdev->dev, format, ## arg) static DECLARE_WAIT_QUEUE_HEAD(tb_cfg_request_cancel_queue);/* Serializes access to request kref_get/put */static DEFINE_MUTEX(tb_cfg_request_lock); /** * tb_cfg_request_alloc() - Allocates a new config request * * This is refcounted object so when you are done with this, call * tb_cfg_request_put() to it. */struct tb_cfg_request *tb_cfg_request_alloc(void){ struct tb_cfg_request *req; req = kzalloc(sizeof(*req), GFP_KERNEL); if (!req) return NULL; kref_init(&req->kref); return req;} /** * tb_cfg_request_get() - Increase refcount of a request * @req: Request whose refcount is increased */void tb_cfg_request_get(struct tb_cfg_request *req){ mutex_lock(&tb_cfg_request_lock); kref_get(&req->kref); mutex_unlock(&tb_cfg_request_lock);} static void tb_cfg_request_destroy(struct kref *kref){ struct tb_cfg_request *req = container_of(kref, typeof(*req), kref); kfree(req);} /** * tb_cfg_request_put() - Decrease refcount and possibly release the request * @req: Request whose refcount is decreased * * Call this function when you are done with the request. When refcount * goes to %0 the object is released. */void tb_cfg_request_put(struct tb_cfg_request *req){ mutex_lock(&tb_cfg_request_lock); kref_put(&req->kref, tb_cfg_request_destroy); mutex_unlock(&tb_cfg_request_lock);} static int tb_cfg_request_enqueue(struct tb_ctl *ctl, struct tb_cfg_request *req){ WARN_ON(test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags)); WARN_ON(req->ctl); mutex_lock(&ctl->request_queue_lock); if (!ctl->running) { mutex_unlock(&ctl->request_queue_lock); return -ENOTCONN; } req->ctl = ctl; list_add_tail(&req->list, &ctl->request_queue); set_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); mutex_unlock(&ctl->request_queue_lock); return 0;} static void tb_cfg_request_dequeue(struct tb_cfg_request *req){ struct tb_ctl *ctl = req->ctl; mutex_lock(&ctl->request_queue_lock); list_del(&req->list); clear_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); if (test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) wake_up(&tb_cfg_request_cancel_queue); mutex_unlock(&ctl->request_queue_lock);} static bool tb_cfg_request_is_active(struct tb_cfg_request *req){ return test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags);} static struct tb_cfg_request *tb_cfg_request_find(struct tb_ctl *ctl, struct ctl_pkg *pkg){ struct tb_cfg_request *req; bool found = false; mutex_lock(&pkg->ctl->request_queue_lock); list_for_each_entry(req, &pkg->ctl->request_queue, list) { tb_cfg_request_get(req); if (req->match(req, pkg)) { found = true; break; } tb_cfg_request_put(req); } mutex_unlock(&pkg->ctl->request_queue_lock); return found ? req : NULL;} /* utility functions */ static int check_header(const struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, u64 route){ struct tb_cfg_header *header = pkg->buffer; /* check frame, TODO: frame flags */ if (WARN(len != pkg->frame.size, "wrong framesize (expected %#x, got %#x)\n", len, pkg->frame.size)) return -EIO; if (WARN(type != pkg->frame.eof, "wrong eof (expected %#x, got %#x)\n", type, pkg->frame.eof)) return -EIO; if (WARN(pkg->frame.sof, "wrong sof (expected 0x0, got %#x)\n", pkg->frame.sof)) return -EIO; /* check header */ if (WARN(header->unknown != 1 << 9, "header->unknown is %#x\n", header->unknown)) return -EIO; if (WARN(route != tb_cfg_get_route(header), "wrong route (expected %llx, got %llx)", route, tb_cfg_get_route(header))) return -EIO; return 0;} static int check_config_address(struct tb_cfg_address addr, enum tb_cfg_space space, u32 offset, u32 length){ if (WARN(addr.zero, "addr.zero is %#x\n", addr.zero)) return -EIO; if (WARN(space != addr.space, "wrong space (expected %x, got %x\n)", space, addr.space)) return -EIO; if (WARN(offset != addr.offset, "wrong offset (expected %x, got %x\n)", offset, addr.offset)) return -EIO; if (WARN(length != addr.length, "wrong space (expected %x, got %x\n)", length, addr.length)) return -EIO; /* * We cannot check addr->port as it is set to the upstream port of the * sender. */ return 0;} static struct tb_cfg_result decode_error(const struct ctl_pkg *response){ struct cfg_error_pkg *pkg = response->buffer; struct tb_cfg_result res = { 0 }; res.response_route = tb_cfg_get_route(&pkg->header); res.response_port = 0; res.err = check_header(response, sizeof(*pkg), TB_CFG_PKG_ERROR, tb_cfg_get_route(&pkg->header)); if (res.err) return res; WARN(pkg->zero1, "pkg->zero1 is %#x\n", pkg->zero1); WARN(pkg->zero2, "pkg->zero1 is %#x\n", pkg->zero1); WARN(pkg->zero3, "pkg->zero1 is %#x\n", pkg->zero1); res.err = 1; res.tb_error = pkg->error; res.response_port = pkg->port; return res; } static struct tb_cfg_result parse_header(const struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, u64 route){ struct tb_cfg_header *header = pkg->buffer; struct tb_cfg_result res = { 0 }; if (pkg->frame.eof == TB_CFG_PKG_ERROR) return decode_error(pkg); res.response_port = 0; /* will be updated later for cfg_read/write */ res.response_route = tb_cfg_get_route(header); res.err = check_header(pkg, len, type, route); return res;} static void tb_cfg_print_error(struct tb_ctl *ctl, const struct tb_cfg_result *res){ WARN_ON(res->err != 1); switch (res->tb_error) { case TB_CFG_ERROR_PORT_NOT_CONNECTED: /* Port is not connected. This can happen during surprise * removal. Do not warn. */ return; case TB_CFG_ERROR_INVALID_CONFIG_SPACE: /* * Invalid cfg_space/offset/length combination in * cfg_read/cfg_write. */ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid config space or offset\n", res->response_route, res->response_port); return; case TB_CFG_ERROR_NO_SUCH_PORT: /* * - The route contains a non-existent port. * - The route contains a non-PHY port (e.g. PCIe). * - The port in cfg_read/cfg_write does not exist. */ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid port\n", res->response_route, res->response_port); return; case TB_CFG_ERROR_LOOP: tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Route contains a loop\n", res->response_route, res->response_port); return; default: /* 5,6,7,9 and 11 are also valid error codes */ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Unknown error\n", res->response_route, res->response_port); return; }} static void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len){ int i; for (i = 0; i < len; i++) dst[i] = cpu_to_be32(src[i]);} static void be32_to_cpu_array(u32 *dst, __be32 *src, size_t len){ int i; for (i = 0; i < len; i++) dst[i] = be32_to_cpu(src[i]);} static __be32 tb_crc(const void *data, size_t len){ return cpu_to_be32(~__crc32c_le(~0, data, len));} static void tb_ctl_pkg_free(struct ctl_pkg *pkg){ if (pkg) { dma_pool_free(pkg->ctl->frame_pool, pkg->buffer, pkg->frame.buffer_phy); kfree(pkg); }} static struct ctl_pkg *tb_ctl_pkg_alloc(struct tb_ctl *ctl){ struct ctl_pkg *pkg = kzalloc(sizeof(*pkg), GFP_KERNEL); if (!pkg) return NULL; pkg->ctl = ctl; pkg->buffer = dma_pool_alloc(ctl->frame_pool, GFP_KERNEL, &pkg->frame.buffer_phy); if (!pkg->buffer) { kfree(pkg); return NULL; } return pkg;} /* RX/TX handling */ static void tb_ctl_tx_callback(struct tb_ring *ring, struct ring_frame *frame, bool canceled){ struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); tb_ctl_pkg_free(pkg);} /** * tb_cfg_tx() - transmit a packet on the control channel * * len must be a multiple of four. * * Return: Returns 0 on success or an error code on failure. */static int tb_ctl_tx(struct tb_ctl *ctl, const void *data, size_t len, enum tb_cfg_pkg_type type){ int res; struct ctl_pkg *pkg; if (len % 4 != 0) { /* required for le->be conversion */ tb_ctl_WARN(ctl, "TX: invalid size: %zu\n", len); return -EINVAL; } if (len > TB_FRAME_SIZE - 4) { /* checksum is 4 bytes */ tb_ctl_WARN(ctl, "TX: packet too large: %zu/%d\n", len, TB_FRAME_SIZE - 4); return -EINVAL; } pkg = tb_ctl_pkg_alloc(ctl); if (!pkg) return -ENOMEM; pkg->frame.callback = tb_ctl_tx_callback; pkg->frame.size = len + 4; pkg->frame.sof = type; pkg->frame.eof = type; cpu_to_be32_array(pkg->buffer, data, len / 4); *(__be32 *) (pkg->buffer + len) = tb_crc(pkg->buffer, len); res = ring_tx(ctl->tx, &pkg->frame); if (res) /* ring is stopped */ tb_ctl_pkg_free(pkg); return res;} /** * tb_ctl_handle_event() - acknowledge a plug event, invoke ctl->callback */static void tb_ctl_handle_event(struct tb_ctl *ctl, enum tb_cfg_pkg_type type, struct ctl_pkg *pkg, size_t size){ ctl->callback(ctl->callback_data, type, pkg->buffer, size);} static void tb_ctl_rx_submit(struct ctl_pkg *pkg){ ring_rx(pkg->ctl->rx, &pkg->frame); /* * We ignore failures during stop. * All rx packets are referenced * from ctl->rx_packets, so we do * not loose them. */} static int tb_async_error(const struct ctl_pkg *pkg){ const struct cfg_error_pkg *error = (const struct cfg_error_pkg *)pkg; if (pkg->frame.eof != TB_CFG_PKG_ERROR) return false; switch (error->error) { case TB_CFG_ERROR_LINK_ERROR: case TB_CFG_ERROR_HEC_ERROR_DETECTED: case TB_CFG_ERROR_FLOW_CONTROL_ERROR: return true; default: return false; }} static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, bool canceled){ struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); struct tb_cfg_request *req; __be32 crc32; if (canceled) return; /* * ring is stopped, packet is referenced from * ctl->rx_packets. */ if (frame->size < 4 || frame->size % 4 != 0) { tb_ctl_err(pkg->ctl, "RX: invalid size %#x, dropping packet\n", frame->size); goto rx; } frame->size -= 4; /* remove checksum */ crc32 = tb_crc(pkg->buffer, frame->size); be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4); switch (frame->eof) { case TB_CFG_PKG_READ: case TB_CFG_PKG_WRITE: case TB_CFG_PKG_ERROR: case TB_CFG_PKG_OVERRIDE: case TB_CFG_PKG_RESET: if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { tb_ctl_err(pkg->ctl, "RX: checksum mismatch, dropping packet\n"); goto rx; } if (tb_async_error(pkg)) { tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size); goto rx; } break; case TB_CFG_PKG_EVENT: if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { tb_ctl_err(pkg->ctl, "RX: checksum mismatch, dropping packet\n"); goto rx; } /* Fall through */ case TB_CFG_PKG_ICM_EVENT: tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size); goto rx; default: break; } /* * The received packet will be processed only if there is an * active request and that the packet is what is expected. This * prevents packets such as replies coming after timeout has * triggered from messing with the active requests. */ req = tb_cfg_request_find(pkg->ctl, pkg); if (req) { if (req->copy(req, pkg)) schedule_work(&req->work); tb_cfg_request_put(req); } rx: tb_ctl_rx_submit(pkg);} static void tb_cfg_request_work(struct work_struct *work){ struct tb_cfg_request *req = container_of(work, typeof(*req), work); if (!test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) req->callback(req->callback_data); tb_cfg_request_dequeue(req); tb_cfg_request_put(req);Lines 1–500 of 1016. Load more
/* * Thunderbolt Cactus Ridge driver - control channel and configuration commands * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> */ #include <linux/crc32.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/pci.h> #include <linux/dmapool.h> #include <linux/workqueue.h> #include "ctl.h" #define TB_CTL_RX_PKG_COUNT 10 #define TB_CTL_RETRIES 4 /** * struct tb_cfg - thunderbolt control channel */ struct tb_ctl { struct tb_nhi *nhi; struct tb_ring *tx; struct tb_ring *rx; struct dma_pool *frame_pool; struct ctl_pkg *rx_packets[TB_CTL_RX_PKG_COUNT]; struct mutex request_queue_lock; struct list_head request_queue; bool running; event_cb callback; void *callback_data; }; #define tb_ctl_WARN(ctl, format, arg...) \ dev_WARN(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_err(ctl, format, arg...) \ dev_err(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_warn(ctl, format, arg...) \ dev_warn(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_info(ctl, format, arg...) \ dev_info(&(ctl)->nhi->pdev->dev, format, ## arg) #define tb_ctl_dbg(ctl, format, arg...) \ dev_dbg(&(ctl)->nhi->pdev->dev, format, ## arg) static DECLARE_WAIT_QUEUE_HEAD(tb_cfg_request_cancel_queue); /* Serializes access to request kref_get/put */ static DEFINE_MUTEX(tb_cfg_request_lock); /** * tb_cfg_request_alloc() - Allocates a new config request * * This is refcounted object so when you are done with this, call * tb_cfg_request_put() to it. */ struct tb_cfg_request *tb_cfg_request_alloc(void) { struct tb_cfg_request *req; req = kzalloc(sizeof(*req), GFP_KERNEL); if (!req) return NULL; kref_init(&req->kref); return req; } /** * tb_cfg_request_get() - Increase refcount of a request * @req: Request whose refcount is increased */ void tb_cfg_request_get(struct tb_cfg_request *req) { mutex_lock(&tb_cfg_request_lock); kref_get(&req->kref); mutex_unlock(&tb_cfg_request_lock); } static void tb_cfg_request_destroy(struct kref *kref) { struct tb_cfg_request *req = container_of(kref, typeof(*req), kref); kfree(req); } /** * tb_cfg_request_put() - Decrease refcount and possibly release the request * @req: Request whose refcount is decreased * * Call this function when you are done with the request. When refcount * goes to %0 the object is released. */ void tb_cfg_request_put(struct tb_cfg_request *req) { mutex_lock(&tb_cfg_request_lock); kref_put(&req->kref, tb_cfg_request_destroy); mutex_unlock(&tb_cfg_request_lock); } static int tb_cfg_request_enqueue(struct tb_ctl *ctl, struct tb_cfg_request *req) { WARN_ON(test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags)); WARN_ON(req->ctl); mutex_lock(&ctl->request_queue_lock); if (!ctl->running) { mutex_unlock(&ctl->request_queue_lock); return -ENOTCONN; } req->ctl = ctl; list_add_tail(&req->list, &ctl->request_queue); set_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); mutex_unlock(&ctl->request_queue_lock); return 0; } static void tb_cfg_request_dequeue(struct tb_cfg_request *req) { struct tb_ctl *ctl = req->ctl; mutex_lock(&ctl->request_queue_lock); list_del(&req->list); clear_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); if (test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) wake_up(&tb_cfg_request_cancel_queue); mutex_unlock(&ctl->request_queue_lock); } static bool tb_cfg_request_is_active(struct tb_cfg_request *req) { return test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); } static struct tb_cfg_request * tb_cfg_request_find(struct tb_ctl *ctl, struct ctl_pkg *pkg) { struct tb_cfg_request *req; bool found = false; mutex_lock(&pkg->ctl->request_queue_lock); list_for_each_entry(req, &pkg->ctl->request_queue, list) { tb_cfg_request_get(req); if (req->match(req, pkg)) { found = true; break; } tb_cfg_request_put(req); } mutex_unlock(&pkg->ctl->request_queue_lock); return found ? req : NULL; } /* utility functions */ static int check_header(const struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, u64 route) { struct tb_cfg_header *header = pkg->buffer; /* check frame, TODO: frame flags */ if (WARN(len != pkg->frame.size, "wrong framesize (expected %#x, got %#x)\n", len, pkg->frame.size)) return -EIO; if (WARN(type != pkg->frame.eof, "wrong eof (expected %#x, got %#x)\n", type, pkg->frame.eof)) return -EIO; if (WARN(pkg->frame.sof, "wrong sof (expected 0x0, got %#x)\n", pkg->frame.sof)) return -EIO; /* check header */ if (WARN(header->unknown != 1 << 9, "header->unknown is %#x\n", header->unknown)) return -EIO; if (WARN(route != tb_cfg_get_route(header), "wrong route (expected %llx, got %llx)", route, tb_cfg_get_route(header))) return -EIO; return 0; } static int check_config_address(struct tb_cfg_address addr, enum tb_cfg_space space, u32 offset, u32 length) { if (WARN(addr.zero, "addr.zero is %#x\n", addr.zero)) return -EIO; if (WARN(space != addr.space, "wrong space (expected %x, got %x\n)", space, addr.space)) return -EIO; if (WARN(offset != addr.offset, "wrong offset (expected %x, got %x\n)", offset, addr.offset)) return -EIO; if (WARN(length != addr.length, "wrong space (expected %x, got %x\n)", length, addr.length)) return -EIO; /* * We cannot check addr->port as it is set to the upstream port of the * sender. */ return 0; } static struct tb_cfg_result decode_error(const struct ctl_pkg *response) { struct cfg_error_pkg *pkg = response->buffer; struct tb_cfg_result res = { 0 }; res.response_route = tb_cfg_get_route(&pkg->header); res.response_port = 0; res.err = check_header(response, sizeof(*pkg), TB_CFG_PKG_ERROR, tb_cfg_get_route(&pkg->header)); if (res.err) return res; WARN(pkg->zero1, "pkg->zero1 is %#x\n", pkg->zero1); WARN(pkg->zero2, "pkg->zero1 is %#x\n", pkg->zero1); WARN(pkg->zero3, "pkg->zero1 is %#x\n", pkg->zero1); res.err = 1; res.tb_error = pkg->error; res.response_port = pkg->port; return res; } static struct tb_cfg_result parse_header(const struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, u64 route) { struct tb_cfg_header *header = pkg->buffer; struct tb_cfg_result res = { 0 }; if (pkg->frame.eof == TB_CFG_PKG_ERROR) return decode_error(pkg); res.response_port = 0; /* will be updated later for cfg_read/write */ res.response_route = tb_cfg_get_route(header); res.err = check_header(pkg, len, type, route); return res; } static void tb_cfg_print_error(struct tb_ctl *ctl, const struct tb_cfg_result *res) { WARN_ON(res->err != 1); switch (res->tb_error) { case TB_CFG_ERROR_PORT_NOT_CONNECTED: /* Port is not connected. This can happen during surprise * removal. Do not warn. */ return; case TB_CFG_ERROR_INVALID_CONFIG_SPACE: /* * Invalid cfg_space/offset/length combination in * cfg_read/cfg_write. */ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid config space or offset\n", res->response_route, res->response_port); return; case TB_CFG_ERROR_NO_SUCH_PORT: /* * - The route contains a non-existent port. * - The route contains a non-PHY port (e.g. PCIe). * - The port in cfg_read/cfg_write does not exist. */ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid port\n", res->response_route, res->response_port); return; case TB_CFG_ERROR_LOOP: tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Route contains a loop\n", res->response_route, res->response_port); return; default: /* 5,6,7,9 and 11 are also valid error codes */ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Unknown error\n", res->response_route, res->response_port); return; } } static void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len) { int i; for (i = 0; i < len; i++) dst[i] = cpu_to_be32(src[i]); } static void be32_to_cpu_array(u32 *dst, __be32 *src, size_t len) { int i; for (i = 0; i < len; i++) dst[i] = be32_to_cpu(src[i]); } static __be32 tb_crc(const void *data, size_t len) { return cpu_to_be32(~__crc32c_le(~0, data, len)); } static void tb_ctl_pkg_free(struct ctl_pkg *pkg) { if (pkg) { dma_pool_free(pkg->ctl->frame_pool, pkg->buffer, pkg->frame.buffer_phy); kfree(pkg); } } static struct ctl_pkg *tb_ctl_pkg_alloc(struct tb_ctl *ctl) { struct ctl_pkg *pkg = kzalloc(sizeof(*pkg), GFP_KERNEL); if (!pkg) return NULL; pkg->ctl = ctl; pkg->buffer = dma_pool_alloc(ctl->frame_pool, GFP_KERNEL, &pkg->frame.buffer_phy); if (!pkg->buffer) { kfree(pkg); return NULL; } return pkg; } /* RX/TX handling */ static void tb_ctl_tx_callback(struct tb_ring *ring, struct ring_frame *frame, bool canceled) { struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); tb_ctl_pkg_free(pkg); } /** * tb_cfg_tx() - transmit a packet on the control channel * * len must be a multiple of four. * * Return: Returns 0 on success or an error code on failure. */ static int tb_ctl_tx(struct tb_ctl *ctl, const void *data, size_t len, enum tb_cfg_pkg_type type) { int res; struct ctl_pkg *pkg; if (len % 4 != 0) { /* required for le->be conversion */ tb_ctl_WARN(ctl, "TX: invalid size: %zu\n", len); return -EINVAL; } if (len > TB_FRAME_SIZE - 4) { /* checksum is 4 bytes */ tb_ctl_WARN(ctl, "TX: packet too large: %zu/%d\n", len, TB_FRAME_SIZE - 4); return -EINVAL; } pkg = tb_ctl_pkg_alloc(ctl); if (!pkg) return -ENOMEM; pkg->frame.callback = tb_ctl_tx_callback; pkg->frame.size = len + 4; pkg->frame.sof = type; pkg->frame.eof = type; cpu_to_be32_array(pkg->buffer, data, len / 4); *(__be32 *) (pkg->buffer + len) = tb_crc(pkg->buffer, len); res = ring_tx(ctl->tx, &pkg->frame); if (res) /* ring is stopped */ tb_ctl_pkg_free(pkg); return res; } /** * tb_ctl_handle_event() - acknowledge a plug event, invoke ctl->callback */ static void tb_ctl_handle_event(struct tb_ctl *ctl, enum tb_cfg_pkg_type type, struct ctl_pkg *pkg, size_t size) { ctl->callback(ctl->callback_data, type, pkg->buffer, size); } static void tb_ctl_rx_submit(struct ctl_pkg *pkg) { ring_rx(pkg->ctl->rx, &pkg->frame); /* * We ignore failures during stop. * All rx packets are referenced * from ctl->rx_packets, so we do * not loose them. */ } static int tb_async_error(const struct ctl_pkg *pkg) { const struct cfg_error_pkg *error = (const struct cfg_error_pkg *)pkg; if (pkg->frame.eof != TB_CFG_PKG_ERROR) return false; switch (error->error) { case TB_CFG_ERROR_LINK_ERROR: case TB_CFG_ERROR_HEC_ERROR_DETECTED: case TB_CFG_ERROR_FLOW_CONTROL_ERROR: return true; default: return false; } } static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, bool canceled) { struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); struct tb_cfg_request *req; __be32 crc32; if (canceled) return; /* * ring is stopped, packet is referenced from * ctl->rx_packets. */ if (frame->size < 4 || frame->size % 4 != 0) { tb_ctl_err(pkg->ctl, "RX: invalid size %#x, dropping packet\n", frame->size); goto rx; } frame->size -= 4; /* remove checksum */ crc32 = tb_crc(pkg->buffer, frame->size); be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4); switch (frame->eof) { case TB_CFG_PKG_READ: case TB_CFG_PKG_WRITE: case TB_CFG_PKG_ERROR: case TB_CFG_PKG_OVERRIDE: case TB_CFG_PKG_RESET: if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { tb_ctl_err(pkg->ctl, "RX: checksum mismatch, dropping packet\n"); goto rx; } if (tb_async_error(pkg)) { tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size); goto rx; } break; case TB_CFG_PKG_EVENT: if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { tb_ctl_err(pkg->ctl, "RX: checksum mismatch, dropping packet\n"); goto rx; } /* Fall through */ case TB_CFG_PKG_ICM_EVENT: tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size); goto rx; default: break; } /* * The received packet will be processed only if there is an * active request and that the packet is what is expected. This * prevents packets such as replies coming after timeout has * triggered from messing with the active requests. */ req = tb_cfg_request_find(pkg->ctl, pkg); if (req) { if (req->copy(req, pkg)) schedule_work(&req->work); tb_cfg_request_put(req); } rx: tb_ctl_rx_submit(pkg); } static void tb_cfg_request_work(struct work_struct *work) { struct tb_cfg_request *req = container_of(work, typeof(*req), work); if (!test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) req->callback(req->callback_data); tb_cfg_request_dequeue(req); tb_cfg_request_put(req);