| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Anup Patel | 8490 | 99.85% | 18 | 78.26% |
| Kees Cook | 4 | 0.05% | 1 | 4.35% |
| Vinod Koul | 3 | 0.04% | 1 | 4.35% |
| Kefeng Wang | 3 | 0.04% | 1 | 4.35% |
| Thomas Gleixner | 2 | 0.02% | 1 | 4.35% |
| Gustavo A. R. Silva | 1 | 0.01% | 1 | 4.35% |
| Total | 8503 | 23 |
// SPDX-License-Identifier: GPL-2.0-only // Copyright (C) 2017 Broadcom /* * Broadcom SBA RAID Driver * * The Broadcom stream buffer accelerator (SBA) provides offloading * capabilities for RAID operations. The SBA offload engine is accessible * via Broadcom SoC specific ring manager. Two or more offload engines * can share same Broadcom SoC specific ring manager due to this Broadcom * SoC specific ring manager driver is implemented as a mailbox controller * driver and offload engine drivers are implemented as mallbox clients. * * Typically, Broadcom SoC specific ring manager will implement larger * number of hardware rings over one or more SBA hardware devices. By * design, the internal buffer size of SBA hardware device is limited * but all offload operations supported by SBA can be broken down into * multiple small size requests and executed parallely on multiple SBA * hardware devices for achieving high through-put. * * The Broadcom SBA RAID driver does not require any register programming * except submitting request to SBA hardware device via mailbox channels. * This driver implements a DMA device with one DMA channel using a single * mailbox channel provided by Broadcom SoC specific ring manager driver. * For having more SBA DMA channels, we can create more SBA device nodes * in Broadcom SoC specific DTS based on number of hardware rings supported * by Broadcom SoC ring manager. */ #include <linux/bitops.h> #include <linux/debugfs.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/list.h> #include <linux/mailbox_client.h> #include <linux/mailbox/brcm-message.h> #include <linux/module.h> #include <linux/of_device.h> #include <linux/slab.h> #include <linux/raid/pq.h> #include "dmaengine.h" /* ====== Driver macros and defines ===== */ #define SBA_TYPE_SHIFT 48 #define SBA_TYPE_MASK GENMASK(1, 0) #define SBA_TYPE_A 0x0 #define SBA_TYPE_B 0x2 #define SBA_TYPE_C 0x3 #define SBA_USER_DEF_SHIFT 32 #define SBA_USER_DEF_MASK GENMASK(15, 0) #define SBA_R_MDATA_SHIFT 24 #define SBA_R_MDATA_MASK GENMASK(7, 0) #define SBA_C_MDATA_MS_SHIFT 18 #define SBA_C_MDATA_MS_MASK GENMASK(1, 0) #define SBA_INT_SHIFT 17 #define SBA_INT_MASK BIT(0) #define SBA_RESP_SHIFT 16 #define SBA_RESP_MASK BIT(0) #define SBA_C_MDATA_SHIFT 8 #define SBA_C_MDATA_MASK GENMASK(7, 0) #define SBA_C_MDATA_BNUMx_SHIFT(__bnum) (2 * (__bnum)) #define SBA_C_MDATA_BNUMx_MASK GENMASK(1, 0) #define SBA_C_MDATA_DNUM_SHIFT 5 #define SBA_C_MDATA_DNUM_MASK GENMASK(4, 0) #define SBA_C_MDATA_LS(__v) ((__v) & 0xff) #define SBA_C_MDATA_MS(__v) (((__v) >> 8) & 0x3) #define SBA_CMD_SHIFT 0 #define SBA_CMD_MASK GENMASK(3, 0) #define SBA_CMD_ZERO_BUFFER 0x4 #define SBA_CMD_ZERO_ALL_BUFFERS 0x8 #define SBA_CMD_LOAD_BUFFER 0x9 #define SBA_CMD_XOR 0xa #define SBA_CMD_GALOIS_XOR 0xb #define SBA_CMD_WRITE_BUFFER 0xc #define SBA_CMD_GALOIS 0xe #define SBA_MAX_REQ_PER_MBOX_CHANNEL 8192 #define SBA_MAX_MSG_SEND_PER_MBOX_CHANNEL 8 /* Driver helper macros */ #define to_sba_request(tx) \ container_of(tx, struct sba_request, tx) #define to_sba_device(dchan) \ container_of(dchan, struct sba_device, dma_chan) /* ===== Driver data structures ===== */ enum sba_request_flags { SBA_REQUEST_STATE_FREE = 0x001, SBA_REQUEST_STATE_ALLOCED = 0x002, SBA_REQUEST_STATE_PENDING = 0x004, SBA_REQUEST_STATE_ACTIVE = 0x008, SBA_REQUEST_STATE_ABORTED = 0x010, SBA_REQUEST_STATE_MASK = 0x0ff, SBA_REQUEST_FENCE = 0x100, }; struct sba_request { /* Global state */ struct list_head node; struct sba_device *sba; u32 flags; /* Chained requests management */ struct sba_request *first; struct list_head next; atomic_t next_pending_count; /* BRCM message data */ struct brcm_message msg; struct dma_async_tx_descriptor tx; /* SBA commands */ struct brcm_sba_command cmds[]; }; enum sba_version { SBA_VER_1 = 0, SBA_VER_2 }; struct sba_device { /* Underlying device */ struct device *dev; /* DT configuration parameters */ enum sba_version ver; /* Derived configuration parameters */ u32 max_req; u32 hw_buf_size; u32 hw_resp_size; u32 max_pq_coefs; u32 max_pq_srcs; u32 max_cmd_per_req; u32 max_xor_srcs; u32 max_resp_pool_size; u32 max_cmds_pool_size; /* Maibox client and Mailbox channels */ struct mbox_client client; struct mbox_chan *mchan; struct device *mbox_dev; /* DMA device and DMA channel */ struct dma_device dma_dev; struct dma_chan dma_chan; /* DMA channel resources */ void *resp_base; dma_addr_t resp_dma_base; void *cmds_base; dma_addr_t cmds_dma_base; spinlock_t reqs_lock; bool reqs_fence; struct list_head reqs_alloc_list; struct list_head reqs_pending_list; struct list_head reqs_active_list; struct list_head reqs_aborted_list; struct list_head reqs_free_list; /* DebugFS directory entries */ struct dentry *root; }; /* ====== Command helper routines ===== */ static inline u64 __pure sba_cmd_enc(u64 cmd, u32 val, u32 shift, u32 mask) { cmd &= ~((u64)mask << shift); cmd |= ((u64)(val & mask) << shift); return cmd; } static inline u32 __pure sba_cmd_load_c_mdata(u32 b0) { return b0 & SBA_C_MDATA_BNUMx_MASK; } static inline u32 __pure sba_cmd_write_c_mdata(u32 b0) { return b0 & SBA_C_MDATA_BNUMx_MASK; } static inline u32 __pure sba_cmd_xor_c_mdata(u32 b1, u32 b0) { return (b0 & SBA_C_MDATA_BNUMx_MASK) | ((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1)); } static inline u32 __pure sba_cmd_pq_c_mdata(u32 d, u32 b1, u32 b0) { return (b0 & SBA_C_MDATA_BNUMx_MASK) | ((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1)) | ((d & SBA_C_MDATA_DNUM_MASK) << SBA_C_MDATA_DNUM_SHIFT); } /* ====== General helper routines ===== */ static struct sba_request *sba_alloc_request(struct sba_device *sba) { bool found = false; unsigned long flags; struct sba_request *req = NULL; spin_lock_irqsave(&sba->reqs_lock, flags); list_for_each_entry(req, &sba->reqs_free_list, node) { if (async_tx_test_ack(&req->tx)) { list_move_tail(&req->node, &sba->reqs_alloc_list); found = true; break; } } spin_unlock_irqrestore(&sba->reqs_lock, flags); if (!found) { /* * We have no more free requests so, we peek * mailbox channels hoping few active requests * would have completed which will create more * room for new requests. */ mbox_client_peek_data(sba->mchan); return NULL; } req->flags = SBA_REQUEST_STATE_ALLOCED; req->first = req; INIT_LIST_HEAD(&req->next); atomic_set(&req->next_pending_count, 1); dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan); async_tx_ack(&req->tx); return req; } /* Note: Must be called with sba->reqs_lock held */ static void _sba_pending_request(struct sba_device *sba, struct sba_request *req) { lockdep_assert_held(&sba->reqs_lock); req->flags &= ~SBA_REQUEST_STATE_MASK; req->flags |= SBA_REQUEST_STATE_PENDING; list_move_tail(&req->node, &sba->reqs_pending_list); if (list_empty(&sba->reqs_active_list)) sba->reqs_fence = false; } /* Note: Must be called with sba->reqs_lock held */ static bool _sba_active_request(struct sba_device *sba, struct sba_request *req) { lockdep_assert_held(&sba->reqs_lock); if (list_empty(&sba->reqs_active_list)) sba->reqs_fence = false; if (sba->reqs_fence) return false; req->flags &= ~SBA_REQUEST_STATE_MASK; req->flags |= SBA_REQUEST_STATE_ACTIVE; list_move_tail(&req->node, &sba->reqs_active_list); if (req->flags & SBA_REQUEST_FENCE) sba->reqs_fence = true; return true; } /* Note: Must be called with sba->reqs_lock held */ static void _sba_abort_request(struct sba_device *sba, struct sba_request *req) { lockdep_assert_held(&sba->reqs_lock); req->flags &= ~SBA_REQUEST_STATE_MASK; req->flags |= SBA_REQUEST_STATE_ABORTED; list_move_tail(&req->node, &sba->reqs_aborted_list); if (list_empty(&sba->reqs_active_list)) sba->reqs_fence = false; } /* Note: Must be called with sba->reqs_lock held */ static void _sba_free_request(struct sba_device *sba, struct sba_request *req) { lockdep_assert_held(&sba->reqs_lock); req->flags &= ~SBA_REQUEST_STATE_MASK; req->flags |= SBA_REQUEST_STATE_FREE; list_move_tail(&req->node, &sba->reqs_free_list); if (list_empty(&sba->reqs_active_list)) sba->reqs_fence = false; } static void sba_free_chained_requests(struct sba_request *req) { unsigned long flags; struct sba_request *nreq; struct sba_device *sba = req->sba; spin_lock_irqsave(&sba->reqs_lock, flags); _sba_free_request(sba, req); list_for_each_entry(nreq, &req->next, next) _sba_free_request(sba, nreq); spin_unlock_irqrestore(&sba->reqs_lock, flags); } static void sba_chain_request(struct sba_request *first, struct sba_request *req) { unsigned long flags; struct sba_device *sba = req->sba; spin_lock_irqsave(&sba->reqs_lock, flags); list_add_tail(&req->next, &first->next); req->first = first; atomic_inc(&first->next_pending_count); spin_unlock_irqrestore(&sba->reqs_lock, flags); } static void sba_cleanup_nonpending_requests(struct sba_device *sba) { unsigned long flags; struct sba_request *req, *req1; spin_lock_irqsave(&sba->reqs_lock, flags); /* Freeup all alloced request */ list_for_each_entry_safe(req, req1, &sba->reqs_alloc_list, node) _sba_free_request(sba, req); /* Set all active requests as aborted */ list_for_each_entry_safe(req, req1, &sba->reqs_active_list, node) _sba_abort_request(sba, req); /* * Note: We expect that aborted request will be eventually * freed by sba_receive_message() */ spin_unlock_irqrestore(&sba->reqs_lock, flags); } static void sba_cleanup_pending_requests(struct sba_device *sba) { unsigned long flags; struct sba_request *req, *req1; spin_lock_irqsave(&sba->reqs_lock, flags); /* Freeup all pending request */ list_for_each_entry_safe(req, req1, &sba->reqs_pending_list, node) _sba_free_request(sba, req); spin_unlock_irqrestore(&sba->reqs_lock, flags); } static int sba_send_mbox_request(struct sba_device *sba, struct sba_request *req) { int ret = 0; /* Send message for the request */ req->msg.error = 0; ret = mbox_send_message(sba->mchan, &req->msg); if (ret < 0) { dev_err(sba->dev, "send message failed with error %d", ret); return ret; } /* Check error returned by mailbox controller */ ret = req->msg.error; if (ret < 0) { dev_err(sba->dev, "message error %d", ret); } /* Signal txdone for mailbox channel */ mbox_client_txdone(sba->mchan, ret); return ret; } /* Note: Must be called with sba->reqs_lock held */ static void _sba_process_pending_requests(struct sba_device *sba) { int ret; u32 count; struct sba_request *req; /* Process few pending requests */ count = SBA_MAX_MSG_SEND_PER_MBOX_CHANNEL; while (!list_empty(&sba->reqs_pending_list) && count) { /* Get the first pending request */ req = list_first_entry(&sba->reqs_pending_list, struct sba_request, node); /* Try to make request active */ if (!_sba_active_request(sba, req)) break; /* Send request to mailbox channel */ ret = sba_send_mbox_request(sba, req); if (ret < 0) { _sba_pending_request(sba, req); break; } count--; } } static void sba_process_received_request(struct sba_device *sba, struct sba_request *req) { unsigned long flags; struct dma_async_tx_descriptor *tx; struct sba_request *nreq, *first = req->first; /* Process only after all chained requests are received */ if (!atomic_dec_return(&first->next_pending_count)) { tx = &first->tx; WARN_ON(tx->cookie < 0); if (tx->cookie > 0) { spin_lock_irqsave(&sba->reqs_lock, flags); dma_cookie_complete(tx); spin_unlock_irqrestore(&sba->reqs_lock, flags); dmaengine_desc_get_callback_invoke(tx, NULL); dma_descriptor_unmap(tx); tx->callback = NULL; tx->callback_result = NULL; } dma_run_dependencies(tx); spin_lock_irqsave(&sba->reqs_lock, flags); /* Free all requests chained to first request */ list_for_each_entry(nreq, &first->next, next) _sba_free_request(sba, nreq); INIT_LIST_HEAD(&first->next); /* Free the first request */ _sba_free_request(sba, first); /* Process pending requests */ _sba_process_pending_requests(sba); spin_unlock_irqrestore(&sba->reqs_lock, flags); } } static void sba_write_stats_in_seqfile(struct sba_device *sba, struct seq_file *file) { unsigned long flags; struct sba_request *req; u32 free_count = 0, alloced_count = 0; u32 pending_count = 0, active_count = 0, aborted_count = 0; spin_lock_irqsave(&sba->reqs_lock, flags); list_for_each_entry(req, &sba->reqs_free_list, node) if (async_tx_test_ack(&req->tx)) free_count++; list_for_each_entry(req, &sba->reqs_alloc_list, node) alloced_count++; list_for_each_entry(req, &sba->reqs_pending_list, node) pending_count++; list_for_each_entry(req, &sba->reqs_active_list, node) active_count++; list_for_each_entry(req, &sba->reqs_aborted_list, node) aborted_count++; spin_unlock_irqrestore(&sba->reqs_lock, flags); seq_printf(file, "maximum requests = %d\n", sba->max_req); seq_printf(file, "free requests = %d\n", free_count); seq_printf(file, "alloced requests = %d\n", alloced_count); seq_printf(file, "pending requests = %d\n", pending_count); seq_printf(file, "active requests = %d\n", active_count); seq_printf(file, "aborted requests = %d\n", aborted_count); } /* ====== DMAENGINE callbacks ===== */ static void sba_free_chan_resources(struct dma_chan *dchan) { /* * Channel resources are pre-alloced so we just free-up * whatever we can so that we can re-use pre-alloced * channel resources next time. */ sba_cleanup_nonpending_requests(to_sba_device(dchan)); } static int sba_device_terminate_all(struct dma_chan *dchan) { /* Cleanup all pending requests */ sba_cleanup_pending_requests(to_sba_device(dchan)); return 0; } static void sba_issue_pending(struct dma_chan *dchan) { unsigned long flags; struct sba_device *sba = to_sba_device(dchan); /* Process pending requests */ spin_lock_irqsave(&sba->reqs_lock, flags); _sba_process_pending_requests(sba); spin_unlock_irqrestore(&sba->reqs_lock, flags); } static dma_cookie_t sba_tx_submit(struct dma_async_tx_descriptor *tx) { unsigned long flags; dma_cookie_t cookie; struct sba_device *sba; struct sba_request *req, *nreq; if (unlikely(!tx)) return -EINVAL; sba = to_sba_device(tx->chan); req = to_sba_request(tx); /* Assign cookie and mark all chained requests pending */ spin_lock_irqsave(&sba->reqs_lock, flags); cookie = dma_cookie_assign(tx); _sba_pending_request(sba, req); list_for_each_entry(nreq, &req->next, next) _sba_pending_request(sba, nreq); spin_unlock_irqrestore(&sba->reqs_lock, flags); return cookie; } static enum dma_status sba_tx_status(struct dma_chan *dchan, dma_cookie_t cookie, struct dma_tx_state *txstate) { enum dma_status ret; struct sba_device *sba = to_sba_device(dchan); ret = dma_cookie_status(dchan, cookie, txstate); if (ret == DMA_COMPLETE) return ret; mbox_client_peek_data(sba->mchan); return dma_cookie_status(dchan, cookie, txstate); } static void sba_fillup_interrupt_msg(struct sba_request *req, struct brcm_sba_command *cmds, struct brcm_message *msg) { u64 cmd; u32 c_mdata; dma_addr_t resp_dma = req->tx.phys; struct brcm_sba_command *cmdsp = cmds; /* Type-B command to load dummy data into buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_load_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = resp_dma; cmdsp->data_len = req->sba->hw_resp_size; cmdsp++; /* Type-A command to write buf0 to dummy location */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, 0x1, SBA_RESP_SHIFT, SBA_RESP_MASK); c_mdata = sba_cmd_write_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; if (req->sba->hw_resp_size) { cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; cmdsp->resp = resp_dma; cmdsp->resp_len = req->sba->hw_resp_size; } cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; cmdsp->data = resp_dma; cmdsp->data_len = req->sba->hw_resp_size; cmdsp++; /* Fillup brcm_message */ msg->type = BRCM_MESSAGE_SBA; msg->sba.cmds = cmds; msg->sba.cmds_count = cmdsp - cmds; msg->ctx = req; msg->error = 0; } static struct dma_async_tx_descriptor * sba_prep_dma_interrupt(struct dma_chan *dchan, unsigned long flags) { struct sba_request *req = NULL; struct sba_device *sba = to_sba_device(dchan); /* Alloc new request */ req = sba_alloc_request(sba); if (!req) return NULL; /* * Force fence so that no requests are submitted * until DMA callback for this request is invoked. */ req->flags |= SBA_REQUEST_FENCE; /* Fillup request message */ sba_fillup_interrupt_msg(req, req->cmds, &req->msg); /* Init async_tx descriptor */ req->tx.flags = flags; req->tx.cookie = -EBUSY; return &req->tx; } static void sba_fillup_memcpy_msg(struct sba_request *req, struct brcm_sba_command *cmds, struct brcm_message *msg, dma_addr_t msg_offset, size_t msg_len, dma_addr_t dst, dma_addr_t src) { u64 cmd; u32 c_mdata; dma_addr_t resp_dma = req->tx.phys; struct brcm_sba_command *cmdsp = cmds; /* Type-B command to load data into buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_load_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = src + msg_offset; cmdsp->data_len = msg_len; cmdsp++; /* Type-A command to write buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, 0x1, SBA_RESP_SHIFT, SBA_RESP_MASK); c_mdata = sba_cmd_write_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; if (req->sba->hw_resp_size) { cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; cmdsp->resp = resp_dma; cmdsp->resp_len = req->sba->hw_resp_size; } cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; cmdsp->data = dst + msg_offset; cmdsp->data_len = msg_len; cmdsp++; /* Fillup brcm_message */ msg->type = BRCM_MESSAGE_SBA; msg->sba.cmds = cmds; msg->sba.cmds_count = cmdsp - cmds; msg->ctx = req; msg->error = 0; } static struct sba_request * sba_prep_dma_memcpy_req(struct sba_device *sba, dma_addr_t off, dma_addr_t dst, dma_addr_t src, size_t len, unsigned long flags) { struct sba_request *req = NULL; /* Alloc new request */ req = sba_alloc_request(sba); if (!req) return NULL; if (flags & DMA_PREP_FENCE) req->flags |= SBA_REQUEST_FENCE; /* Fillup request message */ sba_fillup_memcpy_msg(req, req->cmds, &req->msg, off, len, dst, src); /* Init async_tx descriptor */ req->tx.flags = flags; req->tx.cookie = -EBUSY; return req; } static struct dma_async_tx_descriptor * sba_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src, size_t len, unsigned long flags) { size_t req_len; dma_addr_t off = 0; struct sba_device *sba = to_sba_device(dchan); struct sba_request *first = NULL, *req; /* Create chained requests where each request is upto hw_buf_size */ while (len) { req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size; req = sba_prep_dma_memcpy_req(sba, off, dst, src, req_len, flags); if (!req) { if (first) sba_free_chained_requests(first); return NULL; } if (first) sba_chain_request(first, req); else first = req; off += req_len; len -= req_len; } return (first) ? &first->tx : NULL; } static void sba_fillup_xor_msg(struct sba_request *req, struct brcm_sba_command *cmds, struct brcm_message *msg, dma_addr_t msg_offset, size_t msg_len, dma_addr_t dst, dma_addr_t *src, u32 src_cnt) { u64 cmd; u32 c_mdata; unsigned int i; dma_addr_t resp_dma = req->tx.phys; struct brcm_sba_command *cmdsp = cmds; /* Type-B command to load data into buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_load_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = src[0] + msg_offset; cmdsp->data_len = msg_len; cmdsp++; /* Type-B commands to xor data with buf0 and put it back in buf0 */ for (i = 1; i < src_cnt; i++) { cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_xor_c_mdata(0, 0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_XOR, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = src[i] + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } /* Type-A command to write buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, 0x1, SBA_RESP_SHIFT, SBA_RESP_MASK); c_mdata = sba_cmd_write_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; if (req->sba->hw_resp_size) { cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; cmdsp->resp = resp_dma; cmdsp->resp_len = req->sba->hw_resp_size; } cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; cmdsp->data = dst + msg_offset; cmdsp->data_len = msg_len; cmdsp++; /* Fillup brcm_message */ msg->type = BRCM_MESSAGE_SBA; msg->sba.cmds = cmds; msg->sba.cmds_count = cmdsp - cmds; msg->ctx = req; msg->error = 0; } static struct sba_request * sba_prep_dma_xor_req(struct sba_device *sba, dma_addr_t off, dma_addr_t dst, dma_addr_t *src, u32 src_cnt, size_t len, unsigned long flags) { struct sba_request *req = NULL; /* Alloc new request */ req = sba_alloc_request(sba); if (!req) return NULL; if (flags & DMA_PREP_FENCE) req->flags |= SBA_REQUEST_FENCE; /* Fillup request message */ sba_fillup_xor_msg(req, req->cmds, &req->msg, off, len, dst, src, src_cnt); /* Init async_tx descriptor */ req->tx.flags = flags; req->tx.cookie = -EBUSY; return req; } static struct dma_async_tx_descriptor * sba_prep_dma_xor(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src, u32 src_cnt, size_t len, unsigned long flags) { size_t req_len; dma_addr_t off = 0; struct sba_device *sba = to_sba_device(dchan); struct sba_request *first = NULL, *req; /* Sanity checks */ if (unlikely(src_cnt > sba->max_xor_srcs)) return NULL; /* Create chained requests where each request is upto hw_buf_size */ while (len) { req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size; req = sba_prep_dma_xor_req(sba, off, dst, src, src_cnt, req_len, flags); if (!req) { if (first) sba_free_chained_requests(first); return NULL; } if (first) sba_chain_request(first, req); else first = req; off += req_len; len -= req_len; } return (first) ? &first->tx : NULL; } static void sba_fillup_pq_msg(struct sba_request *req, bool pq_continue, struct brcm_sba_command *cmds, struct brcm_message *msg, dma_addr_t msg_offset, size_t msg_len, dma_addr_t *dst_p, dma_addr_t *dst_q, const u8 *scf, dma_addr_t *src, u32 src_cnt) { u64 cmd; u32 c_mdata; unsigned int i; dma_addr_t resp_dma = req->tx.phys; struct brcm_sba_command *cmdsp = cmds; if (pq_continue) { /* Type-B command to load old P into buf0 */ if (dst_p) { cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_load_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = *dst_p + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } /* Type-B command to load old Q into buf1 */ if (dst_q) { cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_load_c_mdata(1); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = *dst_q + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } } else { /* Type-A command to zero all buffers */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; cmdsp++; } /* Type-B commands for generate P onto buf0 and Q onto buf1 */ for (i = 0; i < src_cnt; i++) { cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_pq_c_mdata(raid6_gflog[scf[i]], 1, 0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata), SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS_XOR, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = src[i] + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } /* Type-A command to write buf0 */ if (dst_p) { cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, 0x1, SBA_RESP_SHIFT, SBA_RESP_MASK); c_mdata = sba_cmd_write_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; if (req->sba->hw_resp_size) { cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; cmdsp->resp = resp_dma; cmdsp->resp_len = req->sba->hw_resp_size; } cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; cmdsp->data = *dst_p + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } /* Type-A command to write buf1 */ if (dst_q) { cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, 0x1, SBA_RESP_SHIFT, SBA_RESP_MASK); c_mdata = sba_cmd_write_c_mdata(1); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; if (req->sba->hw_resp_size) { cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; cmdsp->resp = resp_dma; cmdsp->resp_len = req->sba->hw_resp_size; } cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; cmdsp->data = *dst_q + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } /* Fillup brcm_message */ msg->type = BRCM_MESSAGE_SBA; msg->sba.cmds = cmds; msg->sba.cmds_count = cmdsp - cmds; msg->ctx = req; msg->error = 0; } static struct sba_request * sba_prep_dma_pq_req(struct sba_device *sba, dma_addr_t off, dma_addr_t *dst_p, dma_addr_t *dst_q, dma_addr_t *src, u32 src_cnt, const u8 *scf, size_t len, unsigned long flags) { struct sba_request *req = NULL; /* Alloc new request */ req = sba_alloc_request(sba); if (!req) return NULL; if (flags & DMA_PREP_FENCE) req->flags |= SBA_REQUEST_FENCE; /* Fillup request messages */ sba_fillup_pq_msg(req, dmaf_continue(flags), req->cmds, &req->msg, off, len, dst_p, dst_q, scf, src, src_cnt); /* Init async_tx descriptor */ req->tx.flags = flags; req->tx.cookie = -EBUSY; return req; } static void sba_fillup_pq_single_msg(struct sba_request *req, bool pq_continue, struct brcm_sba_command *cmds, struct brcm_message *msg, dma_addr_t msg_offset, size_t msg_len, dma_addr_t *dst_p, dma_addr_t *dst_q, dma_addr_t src, u8 scf) { u64 cmd; u32 c_mdata; u8 pos, dpos = raid6_gflog[scf]; dma_addr_t resp_dma = req->tx.phys; struct brcm_sba_command *cmdsp = cmds; if (!dst_p) goto skip_p; if (pq_continue) { /* Type-B command to load old P into buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_load_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = *dst_p + msg_offset; cmdsp->data_len = msg_len; cmdsp++; /* * Type-B commands to xor data with buf0 and put it * back in buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_xor_c_mdata(0, 0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_XOR, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = src + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } else { /* Type-B command to load old P into buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_load_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = src + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } /* Type-A command to write buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, 0x1, SBA_RESP_SHIFT, SBA_RESP_MASK); c_mdata = sba_cmd_write_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; if (req->sba->hw_resp_size) { cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; cmdsp->resp = resp_dma; cmdsp->resp_len = req->sba->hw_resp_size; } cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; cmdsp->data = *dst_p + msg_offset; cmdsp->data_len = msg_len; cmdsp++; skip_p: if (!dst_q) goto skip_q; /* Type-A command to zero all buffers */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; cmdsp++; if (dpos == 255) goto skip_q_computation; pos = (dpos < req->sba->max_pq_coefs) ? dpos : (req->sba->max_pq_coefs - 1); /* * Type-B command to generate initial Q from data * and store output into buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_pq_c_mdata(pos, 0, 0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata), SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = src + msg_offset; cmdsp->data_len = msg_len; cmdsp++; dpos -= pos; /* Multiple Type-A command to generate final Q */ while (dpos) { pos = (dpos < req->sba->max_pq_coefs) ? dpos : (req->sba->max_pq_coefs - 1); /* * Type-A command to generate Q with buf0 and * buf1 store result in buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_pq_c_mdata(pos, 0, 1); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata), SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; cmdsp++; dpos -= pos; } skip_q_computation: if (pq_continue) { /* * Type-B command to XOR previous output with * buf0 and write it into buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_B, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); c_mdata = sba_cmd_xor_c_mdata(0, 0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_XOR, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_B; cmdsp->data = *dst_q + msg_offset; cmdsp->data_len = msg_len; cmdsp++; } /* Type-A command to write buf0 */ cmd = sba_cmd_enc(0x0, SBA_TYPE_A, SBA_TYPE_SHIFT, SBA_TYPE_MASK); cmd = sba_cmd_enc(cmd, msg_len, SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); cmd = sba_cmd_enc(cmd, 0x1, SBA_RESP_SHIFT, SBA_RESP_MASK); c_mdata = sba_cmd_write_c_mdata(0); cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, SBA_CMD_SHIFT, SBA_CMD_MASK); cmdsp->cmd = cmd; *cmdsp->cmd_dma = cpu_to_le64(cmd); cmdsp->flags = BRCM_SBA_CMD_TYPE_A; if (req->sba->hw_resp_size) { cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; cmdsp->resp = resp_dma; cmdsp->resp_len = req->sba->hw_resp_size; } cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; cmdsp->data = *dst_q + msg_offset; cmdsp->data_len = msg_len; cmdsp++; skip_q: /* Fillup brcm_message */ msg->type = BRCM_MESSAGE_SBA; msg->sba.cmds = cmds; msg->sba.cmds_count = cmdsp - cmds; msg->ctx = req; msg->error = 0; } static struct sba_request * sba_prep_dma_pq_single_req(struct sba_device *sba, dma_addr_t off, dma_addr_t *dst_p, dma_addr_t *dst_q, dma_addr_t src, u8 scf, size_t len, unsigned long flags) { struct sba_request *req = NULL; /* Alloc new request */ req = sba_alloc_request(sba); if (!req) return NULL; if (flags & DMA_PREP_FENCE) req->flags |= SBA_REQUEST_FENCE; /* Fillup request messages */ sba_fillup_pq_single_msg(req, dmaf_continue(flags), req->cmds, &req->msg, off, len, dst_p, dst_q, src, scf); /* Init async_tx descriptor */ req->tx.flags = flags; req->tx.cookie = -EBUSY; return req; } static struct dma_async_tx_descriptor * sba_prep_dma_pq(struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src, u32 src_cnt, const u8 *scf, size_t len, unsigned long flags) { u32 i, dst_q_index; size_t req_len; bool slow = false; dma_addr_t off = 0; dma_addr_t *dst_p = NULL, *dst_q = NULL; struct sba_device *sba = to_sba_device(dchan); struct sba_request *first = NULL, *req; /* Sanity checks */ if (unlikely(src_cnt > sba->max_pq_srcs)) return NULL; for (i = 0; i < src_cnt; i++) if (sba->max_pq_coefs <= raid6_gflog[scf[i]]) slow = true; /* Figure-out P and Q destination addresses */ if (!(flags & DMA_PREP_PQ_DISABLE_P)) dst_p = &dst[0]; if (!(flags & DMA_PREP_PQ_DISABLE_Q)) dst_q = &dst[1]; /* Create chained requests where each request is upto hw_buf_size */ while (len) { req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size; if (slow) { dst_q_index = src_cnt; if (dst_q) { for (i = 0; i < src_cnt; i++) { if (*dst_q == src[i]) { dst_q_index = i; break; } } } if (dst_q_index < src_cnt) { i = dst_q_index; req = sba_prep_dma_pq_single_req(sba, off, dst_p, dst_q, src[i], scf[i], req_len, flags | DMA_PREP_FENCE); if (!req) goto fail; if (first) sba_chain_request(first, req); else first = req; flags |= DMA_PREP_CONTINUE; } for (i = 0; i < src_cnt; i++) { if (dst_q_index == i) continue; req = sba_prep_dma_pq_single_req(sba, off, dst_p, dst_q, src[i], scf[i], req_len, flags | DMA_PREP_FENCE); if (!req) goto fail; if (first) sba_chain_request(first, req); else first = req; flags |= DMA_PREP_CONTINUE; } } else { req = sba_prep_dma_pq_req(sba, off, dst_p, dst_q, src, src_cnt, scf, req_len, flags); if (!req) goto fail; if (first) sba_chain_request(first, req); else first = req; } off += req_len; len -= req_len; } return (first) ? &first->tx : NULL; fail: if (first) sba_free_chained_requests(first); return NULL; } /* ====== Mailbox callbacks ===== */ static void sba_receive_message(struct mbox_client *cl, void *msg) { struct brcm_message *m = msg; struct sba_request *req = m->ctx; struct sba_device *sba = req->sba; /* Error count if message has error */ if (m->error < 0) dev_err(sba->dev, "%s got message with error %d", dma_chan_name(&sba->dma_chan), m->error); /* Process received request */ sba_process_received_request(sba, req); } /* ====== Debugfs callbacks ====== */ static int sba_debugfs_stats_show(struct seq_file *file, void *offset) { struct sba_device *sba = dev_get_drvdata(file->private); /* Write stats in file */ sba_write_stats_in_seqfile(sba, file); return 0; } /* ====== Platform driver routines ===== */ static int sba_prealloc_channel_resources(struct sba_device *sba) { int i, j, ret = 0; struct sba_request *req = NULL; sba->resp_base = dma_alloc_coherent(sba->mbox_dev, sba->max_resp_pool_size, &sba->resp_dma_base, GFP_KERNEL); if (!sba->resp_base) return -ENOMEM; sba->cmds_base = dma_alloc_coherent(sba->mbox_dev, sba->max_cmds_pool_size, &sba->cmds_dma_base, GFP_KERNEL); if (!sba->cmds_base) { ret = -ENOMEM; goto fail_free_resp_pool; } spin_lock_init(&sba->reqs_lock); sba->reqs_fence = false; INIT_LIST_HEAD(&sba->reqs_alloc_list); INIT_LIST_HEAD(&sba->reqs_pending_list); INIT_LIST_HEAD(&sba->reqs_active_list); INIT_LIST_HEAD(&sba->reqs_aborted_list); INIT_LIST_HEAD(&sba->reqs_free_list); for (i = 0; i < sba->max_req; i++) { req = devm_kzalloc(sba->dev, struct_size(req, cmds, sba->max_cmd_per_req), GFP_KERNEL); if (!req) { ret = -ENOMEM; goto fail_free_cmds_pool; } INIT_LIST_HEAD(&req->node); req->sba = sba; req->flags = SBA_REQUEST_STATE_FREE; INIT_LIST_HEAD(&req->next); atomic_set(&req->next_pending_count, 0); for (j = 0; j < sba->max_cmd_per_req; j++) { req->cmds[j].cmd = 0; req->cmds[j].cmd_dma = sba->cmds_base + (i * sba->max_cmd_per_req + j) * sizeof(u64); req->cmds[j].cmd_dma_addr = sba->cmds_dma_base + (i * sba->max_cmd_per_req + j) * sizeof(u64); req->cmds[j].flags = 0; } memset(&req->msg, 0, sizeof(req->msg)); dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan); async_tx_ack(&req->tx); req->tx.tx_submit = sba_tx_submit; req->tx.phys = sba->resp_dma_base + i * sba->hw_resp_size; list_add_tail(&req->node, &sba->reqs_free_list); } return 0; fail_free_cmds_pool: dma_free_coherent(sba->mbox_dev, sba->max_cmds_pool_size, sba->cmds_base, sba->cmds_dma_base); fail_free_resp_pool: dma_free_coherent(sba->mbox_dev, sba->max_resp_pool_size, sba->resp_base, sba->resp_dma_base); return ret; } static void sba_freeup_channel_resources(struct sba_device *sba) { dmaengine_terminate_all(&sba->dma_chan); dma_free_coherent(sba->mbox_dev, sba->max_cmds_pool_size, sba->cmds_base, sba->cmds_dma_base); dma_free_coherent(sba->mbox_dev, sba->max_resp_pool_size, sba->resp_base, sba->resp_dma_base); sba->resp_base = NULL; sba->resp_dma_base = 0; } static int sba_async_register(struct sba_device *sba) { int ret; struct dma_device *dma_dev = &sba->dma_dev; /* Initialize DMA channel cookie */ sba->dma_chan.device = dma_dev; dma_cookie_init(&sba->dma_chan); /* Initialize DMA device capability mask */ dma_cap_zero(dma_dev->cap_mask); dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask); dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); dma_cap_set(DMA_XOR, dma_dev->cap_mask); dma_cap_set(DMA_PQ, dma_dev->cap_mask); /* * Set mailbox channel device as the base device of * our dma_device because the actual memory accesses * will be done by mailbox controller */ dma_dev->dev = sba->mbox_dev; /* Set base prep routines */ dma_dev->device_free_chan_resources = sba_free_chan_resources; dma_dev->device_terminate_all = sba_device_terminate_all; dma_dev->device_issue_pending = sba_issue_pending; dma_dev->device_tx_status = sba_tx_status; /* Set interrupt routine */ if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) dma_dev->device_prep_dma_interrupt = sba_prep_dma_interrupt; /* Set memcpy routine */ if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) dma_dev->device_prep_dma_memcpy = sba_prep_dma_memcpy; /* Set xor routine and capability */ if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { dma_dev->device_prep_dma_xor = sba_prep_dma_xor; dma_dev->max_xor = sba->max_xor_srcs; } /* Set pq routine and capability */ if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { dma_dev->device_prep_dma_pq = sba_prep_dma_pq; dma_set_maxpq(dma_dev, sba->max_pq_srcs, 0); } /* Initialize DMA device channel list */ INIT_LIST_HEAD(&dma_dev->channels); list_add_tail(&sba->dma_chan.device_node, &dma_dev->channels); /* Register with Linux async DMA framework*/ ret = dma_async_device_register(dma_dev); if (ret) { dev_err(sba->dev, "async device register error %d", ret); return ret; } dev_info(sba->dev, "%s capabilities: %s%s%s%s\n", dma_chan_name(&sba->dma_chan), dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "interrupt " : "", dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "memcpy " : "", dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : ""); return 0; } static int sba_probe(struct platform_device *pdev) { int ret = 0; struct sba_device *sba; struct platform_device *mbox_pdev; struct of_phandle_args args; /* Allocate main SBA struct */ sba = devm_kzalloc(&pdev->dev, sizeof(*sba), GFP_KERNEL); if (!sba) return -ENOMEM; sba->dev = &pdev->dev; platform_set_drvdata(pdev, sba); /* Number of mailbox channels should be atleast 1 */ ret = of_count_phandle_with_args(pdev->dev.of_node, "mboxes", "#mbox-cells"); if (ret <= 0) return -ENODEV; /* Determine SBA version from DT compatible string */ if (of_device_is_compatible(sba->dev->of_node, "brcm,iproc-sba")) sba->ver = SBA_VER_1; else if (of_device_is_compatible(sba->dev->of_node, "brcm,iproc-sba-v2")) sba->ver = SBA_VER_2; else return -ENODEV; /* Derived Configuration parameters */ switch (sba->ver) { case SBA_VER_1: sba->hw_buf_size = 4096; sba->hw_resp_size = 8; sba->max_pq_coefs = 6; sba->max_pq_srcs = 6; break; case SBA_VER_2: sba->hw_buf_size = 4096; sba->hw_resp_size = 8; sba->max_pq_coefs = 30; /* * We can support max_pq_srcs == max_pq_coefs because * we are limited by number of SBA commands that we can * fit in one message for underlying ring manager HW. */ sba->max_pq_srcs = 12; break; default: return -EINVAL; } sba->max_req = SBA_MAX_REQ_PER_MBOX_CHANNEL; sba->max_cmd_per_req = sba->max_pq_srcs + 3; sba->max_xor_srcs = sba->max_cmd_per_req - 1; sba->max_resp_pool_size = sba->max_req * sba->hw_resp_size; sba->max_cmds_pool_size = sba->max_req * sba->max_cmd_per_req * sizeof(u64); /* Setup mailbox client */ sba->client.dev = &pdev->dev; sba->client.rx_callback = sba_receive_message; sba->client.tx_block = false; sba->client.knows_txdone = true; sba->client.tx_tout = 0; /* Request mailbox channel */ sba->mchan = mbox_request_channel(&sba->client, 0); if (IS_ERR(sba->mchan)) { ret = PTR_ERR(sba->mchan); goto fail_free_mchan; } /* Find-out underlying mailbox device */ ret = of_parse_phandle_with_args(pdev->dev.of_node, "mboxes", "#mbox-cells", 0, &args); if (ret) goto fail_free_mchan; mbox_pdev = of_find_device_by_node(args.np); of_node_put(args.np); if (!mbox_pdev) { ret = -ENODEV; goto fail_free_mchan; } sba->mbox_dev = &mbox_pdev->dev; /* Prealloc channel resource */ ret = sba_prealloc_channel_resources(sba); if (ret) goto fail_free_mchan; /* Check availability of debugfs */ if (!debugfs_initialized()) goto skip_debugfs; /* Create debugfs root entry */ sba->root = debugfs_create_dir(dev_name(sba->dev), NULL); /* Create debugfs stats entry */ debugfs_create_devm_seqfile(sba->dev, "stats", sba->root, sba_debugfs_stats_show); skip_debugfs: /* Register DMA device with Linux async framework */ ret = sba_async_register(sba); if (ret) goto fail_free_resources; /* Print device info */ dev_info(sba->dev, "%s using SBAv%d mailbox channel from %s", dma_chan_name(&sba->dma_chan), sba->ver+1, dev_name(sba->mbox_dev)); return 0; fail_free_resources: debugfs_remove_recursive(sba->root); sba_freeup_channel_resources(sba); fail_free_mchan: mbox_free_channel(sba->mchan); return ret; } static int sba_remove(struct platform_device *pdev) { struct sba_device *sba = platform_get_drvdata(pdev); dma_async_device_unregister(&sba->dma_dev); debugfs_remove_recursive(sba->root); sba_freeup_channel_resources(sba); mbox_free_channel(sba->mchan); return 0; } static const struct of_device_id sba_of_match[] = { { .compatible = "brcm,iproc-sba", }, { .compatible = "brcm,iproc-sba-v2", }, {}, }; MODULE_DEVICE_TABLE(of, sba_of_match); static struct platform_driver sba_driver = { .probe = sba_probe, .remove = sba_remove, .driver = { .name = "bcm-sba-raid", .of_match_table = sba_of_match, }, }; module_platform_driver(sba_driver); MODULE_DESCRIPTION("Broadcom SBA RAID driver"); MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>"); MODULE_LICENSE("GPL v2");
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