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linux-next/drivers/dma/bcm-sba-raid.c
Gustavo A. R. Silva 57a8cc7256 dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member 
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Link: https://lore.kernel.org/r/20200213003703.GA4177@embeddedor.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-13 20:15:35 +05:30

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/*
* Copyright (C) 2017 Broadcom
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* 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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