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// SPDX-License-Identifier: GPL-2.0
//
// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
//
// Copyright (c) 2020, 2021 Pengutronix,
// Marc Kleine-Budde <kernel@pengutronix.de>
// Copyright (C) 2015-2018 Etnaviv Project
//
#include <linux/devcoredump.h>
#include "mcp251xfd.h"
#include "mcp251xfd-dump.h"
struct mcp251xfd_dump_iter {
void *start;
struct mcp251xfd_dump_object_header *hdr;
void *data;
};
struct mcp251xfd_dump_reg_space {
u16 base;
u16 size;
};
struct mcp251xfd_dump_ring {
enum mcp251xfd_dump_object_ring_key key;
u32 val;
};
static const struct mcp251xfd_dump_reg_space mcp251xfd_dump_reg_space[] = {
{
.base = MCP251XFD_REG_CON,
.size = MCP251XFD_REG_FLTOBJ(32) - MCP251XFD_REG_CON,
}, {
.base = MCP251XFD_RAM_START,
.size = MCP251XFD_RAM_SIZE,
}, {
.base = MCP251XFD_REG_OSC,
.size = MCP251XFD_REG_DEVID - MCP251XFD_REG_OSC,
},
};
static void mcp251xfd_dump_header(struct mcp251xfd_dump_iter *iter,
enum mcp251xfd_dump_object_type object_type,
const void *data_end)
{
struct mcp251xfd_dump_object_header *hdr = iter->hdr;
unsigned int len;
len = data_end - iter->data;
if (!len)
return;
hdr->magic = cpu_to_le32(MCP251XFD_DUMP_MAGIC);
hdr->type = cpu_to_le32(object_type);
hdr->offset = cpu_to_le32(iter->data - iter->start);
hdr->len = cpu_to_le32(len);
iter->hdr++;
iter->data += len;
}
static void mcp251xfd_dump_registers(const struct mcp251xfd_priv *priv,
struct mcp251xfd_dump_iter *iter)
{
const int val_bytes = regmap_get_val_bytes(priv->map_rx);
struct mcp251xfd_dump_object_reg *reg = iter->data;
unsigned int i, j;
int err;
for (i = 0; i < ARRAY_SIZE(mcp251xfd_dump_reg_space); i++) {
const struct mcp251xfd_dump_reg_space *reg_space;
void *buf;
reg_space = &mcp251xfd_dump_reg_space[i];
buf = kmalloc(reg_space->size, GFP_KERNEL);
if (!buf)
goto out;
err = regmap_bulk_read(priv->map_reg, reg_space->base,
buf, reg_space->size / val_bytes);
if (err) {
kfree(buf);
continue;
}
for (j = 0; j < reg_space->size; j += sizeof(u32), reg++) {
reg->reg = cpu_to_le32(reg_space->base + j);
reg->val = cpu_to_le32p(buf + j);
}
kfree(buf);
}
out:
mcp251xfd_dump_header(iter, MCP251XFD_DUMP_OBJECT_TYPE_REG, reg);
}
static void mcp251xfd_dump_ring(struct mcp251xfd_dump_iter *iter,
enum mcp251xfd_dump_object_type object_type,
const struct mcp251xfd_dump_ring *dump_ring,
unsigned int len)
{
struct mcp251xfd_dump_object_reg *reg = iter->data;
unsigned int i;
for (i = 0; i < len; i++, reg++) {
reg->reg = cpu_to_le32(dump_ring[i].key);
reg->val = cpu_to_le32(dump_ring[i].val);
}
mcp251xfd_dump_header(iter, object_type, reg);
}
static void mcp251xfd_dump_tef_ring(const struct mcp251xfd_priv *priv,
struct mcp251xfd_dump_iter *iter)
{
const struct mcp251xfd_tef_ring *tef = priv->tef;
const struct mcp251xfd_tx_ring *tx = priv->tx;
const struct mcp251xfd_dump_ring dump_ring[] = {
{
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_HEAD,
.val = tef->head,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_TAIL,
.val = tef->tail,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_BASE,
.val = 0,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_NR,
.val = 0,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_FIFO_NR,
.val = 0,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_OBJ_NUM,
.val = tx->obj_num,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_OBJ_SIZE,
.val = sizeof(struct mcp251xfd_hw_tef_obj),
},
};
mcp251xfd_dump_ring(iter, MCP251XFD_DUMP_OBJECT_TYPE_TEF,
dump_ring, ARRAY_SIZE(dump_ring));
}
static void mcp251xfd_dump_rx_ring_one(const struct mcp251xfd_priv *priv,
struct mcp251xfd_dump_iter *iter,
const struct mcp251xfd_rx_ring *rx)
{
const struct mcp251xfd_dump_ring dump_ring[] = {
{
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_HEAD,
.val = rx->head,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_TAIL,
.val = rx->tail,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_BASE,
.val = rx->base,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_NR,
.val = rx->nr,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_FIFO_NR,
.val = rx->fifo_nr,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_OBJ_NUM,
.val = rx->obj_num,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_OBJ_SIZE,
.val = rx->obj_size,
},
};
mcp251xfd_dump_ring(iter, MCP251XFD_DUMP_OBJECT_TYPE_RX,
dump_ring, ARRAY_SIZE(dump_ring));
}
static void mcp251xfd_dump_rx_ring(const struct mcp251xfd_priv *priv,
struct mcp251xfd_dump_iter *iter)
{
struct mcp251xfd_rx_ring *rx_ring;
unsigned int i;
mcp251xfd_for_each_rx_ring(priv, rx_ring, i)
mcp251xfd_dump_rx_ring_one(priv, iter, rx_ring);
}
static void mcp251xfd_dump_tx_ring(const struct mcp251xfd_priv *priv,
struct mcp251xfd_dump_iter *iter)
{
const struct mcp251xfd_tx_ring *tx = priv->tx;
const struct mcp251xfd_dump_ring dump_ring[] = {
{
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_HEAD,
.val = tx->head,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_TAIL,
.val = tx->tail,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_BASE,
.val = tx->base,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_NR,
.val = 0,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_FIFO_NR,
.val = MCP251XFD_TX_FIFO,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_OBJ_NUM,
.val = tx->obj_num,
}, {
.key = MCP251XFD_DUMP_OBJECT_RING_KEY_OBJ_SIZE,
.val = tx->obj_size,
},
};
mcp251xfd_dump_ring(iter, MCP251XFD_DUMP_OBJECT_TYPE_TX,
dump_ring, ARRAY_SIZE(dump_ring));
}
static void mcp251xfd_dump_end(const struct mcp251xfd_priv *priv,
struct mcp251xfd_dump_iter *iter)
{
struct mcp251xfd_dump_object_header *hdr = iter->hdr;
hdr->magic = cpu_to_le32(MCP251XFD_DUMP_MAGIC);
hdr->type = cpu_to_le32(MCP251XFD_DUMP_OBJECT_TYPE_END);
hdr->offset = cpu_to_le32(0);
hdr->len = cpu_to_le32(0);
/* provoke NULL pointer access, if used after END object */
iter->hdr = NULL;
}
void mcp251xfd_dump(const struct mcp251xfd_priv *priv)
{
struct mcp251xfd_dump_iter iter;
unsigned int rings_num, obj_num;
unsigned int file_size = 0;
unsigned int i;
/* register space + end marker */
obj_num = 2;
/* register space */
for (i = 0; i < ARRAY_SIZE(mcp251xfd_dump_reg_space); i++)
file_size += mcp251xfd_dump_reg_space[i].size / sizeof(u32) *
sizeof(struct mcp251xfd_dump_object_reg);
/* TEF ring, RX ring, TX rings */
rings_num = 1 + priv->rx_ring_num + 1;
obj_num += rings_num;
file_size += rings_num * __MCP251XFD_DUMP_OBJECT_RING_KEY_MAX *
sizeof(struct mcp251xfd_dump_object_reg);
/* size of the headers */
file_size += sizeof(*iter.hdr) * obj_num;
/* allocate the file in vmalloc memory, it's likely to be big */
iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_NOWARN |
__GFP_ZERO | __GFP_NORETRY);
if (!iter.start) {
netdev_warn(priv->ndev, "Failed to allocate devcoredump file.\n");
return;
}
/* point the data member after the headers */
iter.hdr = iter.start;
iter.data = &iter.hdr[obj_num];
mcp251xfd_dump_registers(priv, &iter);
mcp251xfd_dump_tef_ring(priv, &iter);
mcp251xfd_dump_rx_ring(priv, &iter);
mcp251xfd_dump_tx_ring(priv, &iter);
mcp251xfd_dump_end(priv, &iter);
dev_coredumpv(&priv->spi->dev, iter.start,
iter.data - iter.start, GFP_KERNEL);
}
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