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bcm-sba-raid.c
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// 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);