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linux/drivers/dma/hisi_dma.c
Kees Cook 7d4b821855 dmaengine: hisilicon: Annotate struct hisi_dma_dev with __counted_by 
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct hisi_dma_dev.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Vinod Koul <vkoul@kernel.org>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
Cc: Jie Hai <haijie1@huawei.com>
Cc: dmaengine@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817235859.49846-5-keescook@chromium.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2023-09-28 16:42:14 +05:30

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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2019-2022 HiSilicon Limited. */
#include <linux/bitfield.h>
#include <linux/dmaengine.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include "virt-dma.h"
/* HiSilicon DMA register common field define */
#define HISI_DMA_Q_SQ_BASE_L 0x0
#define HISI_DMA_Q_SQ_BASE_H 0x4
#define HISI_DMA_Q_SQ_DEPTH 0x8
#define HISI_DMA_Q_SQ_TAIL_PTR 0xc
#define HISI_DMA_Q_CQ_BASE_L 0x10
#define HISI_DMA_Q_CQ_BASE_H 0x14
#define HISI_DMA_Q_CQ_DEPTH 0x18
#define HISI_DMA_Q_CQ_HEAD_PTR 0x1c
#define HISI_DMA_Q_CTRL0 0x20
#define HISI_DMA_Q_CTRL0_QUEUE_EN BIT(0)
#define HISI_DMA_Q_CTRL0_QUEUE_PAUSE BIT(4)
#define HISI_DMA_Q_CTRL1 0x24
#define HISI_DMA_Q_CTRL1_QUEUE_RESET BIT(0)
#define HISI_DMA_Q_FSM_STS 0x30
#define HISI_DMA_Q_FSM_STS_MASK GENMASK(3, 0)
#define HISI_DMA_Q_ERR_INT_NUM0 0x84
#define HISI_DMA_Q_ERR_INT_NUM1 0x88
#define HISI_DMA_Q_ERR_INT_NUM2 0x8c
/* HiSilicon IP08 DMA register and field define */
#define HISI_DMA_HIP08_MODE 0x217C
#define HISI_DMA_HIP08_Q_BASE 0x0
#define HISI_DMA_HIP08_Q_CTRL0_ERR_ABORT_EN BIT(2)
#define HISI_DMA_HIP08_Q_INT_STS 0x40
#define HISI_DMA_HIP08_Q_INT_MSK 0x44
#define HISI_DMA_HIP08_Q_INT_STS_MASK GENMASK(14, 0)
#define HISI_DMA_HIP08_Q_ERR_INT_NUM3 0x90
#define HISI_DMA_HIP08_Q_ERR_INT_NUM4 0x94
#define HISI_DMA_HIP08_Q_ERR_INT_NUM5 0x98
#define HISI_DMA_HIP08_Q_ERR_INT_NUM6 0x48
#define HISI_DMA_HIP08_Q_CTRL0_SQCQ_DRCT BIT(24)
/* HiSilicon IP09 DMA register and field define */
#define HISI_DMA_HIP09_DMA_FLR_DISABLE 0xA00
#define HISI_DMA_HIP09_DMA_FLR_DISABLE_B BIT(0)
#define HISI_DMA_HIP09_Q_BASE 0x2000
#define HISI_DMA_HIP09_Q_CTRL0_ERR_ABORT_EN GENMASK(31, 28)
#define HISI_DMA_HIP09_Q_CTRL0_SQ_DRCT BIT(26)
#define HISI_DMA_HIP09_Q_CTRL0_CQ_DRCT BIT(27)
#define HISI_DMA_HIP09_Q_CTRL1_VA_ENABLE BIT(2)
#define HISI_DMA_HIP09_Q_INT_STS 0x40
#define HISI_DMA_HIP09_Q_INT_MSK 0x44
#define HISI_DMA_HIP09_Q_INT_STS_MASK 0x1
#define HISI_DMA_HIP09_Q_ERR_INT_STS 0x48
#define HISI_DMA_HIP09_Q_ERR_INT_MSK 0x4C
#define HISI_DMA_HIP09_Q_ERR_INT_STS_MASK GENMASK(18, 1)
#define HISI_DMA_HIP09_PORT_CFG_REG(port_id) (0x800 + \
(port_id) * 0x20)
#define HISI_DMA_HIP09_PORT_CFG_LINK_DOWN_MASK_B BIT(16)
#define HISI_DMA_HIP09_MAX_PORT_NUM 16
#define HISI_DMA_HIP08_MSI_NUM 32
#define HISI_DMA_HIP08_CHAN_NUM 30
#define HISI_DMA_HIP09_MSI_NUM 4
#define HISI_DMA_HIP09_CHAN_NUM 4
#define HISI_DMA_REVISION_HIP08B 0x21
#define HISI_DMA_REVISION_HIP09A 0x30
#define HISI_DMA_Q_OFFSET 0x100
#define HISI_DMA_Q_DEPTH_VAL 1024
#define PCI_BAR_2 2
#define HISI_DMA_POLL_Q_STS_DELAY_US 10
#define HISI_DMA_POLL_Q_STS_TIME_OUT_US 1000
#define HISI_DMA_MAX_DIR_NAME_LEN 128
/*
* The HIP08B(HiSilicon IP08) and HIP09A(HiSilicon IP09) are DMA iEPs, they
* have the same pci device id but different pci revision.
* Unfortunately, they have different register layouts, so two layout
* enumerations are defined.
*/
enum hisi_dma_reg_layout {
HISI_DMA_REG_LAYOUT_INVALID = 0,
HISI_DMA_REG_LAYOUT_HIP08,
HISI_DMA_REG_LAYOUT_HIP09
};
enum hisi_dma_mode {
EP = 0,
RC,
};
enum hisi_dma_chan_status {
DISABLE = -1,
IDLE = 0,
RUN,
CPL,
PAUSE,
HALT,
ABORT,
WAIT,
BUFFCLR,
};
struct hisi_dma_sqe {
__le32 dw0;
#define OPCODE_MASK GENMASK(3, 0)
#define OPCODE_SMALL_PACKAGE 0x1
#define OPCODE_M2M 0x4
#define LOCAL_IRQ_EN BIT(8)
#define ATTR_SRC_MASK GENMASK(14, 12)
__le32 dw1;
__le32 dw2;
#define ATTR_DST_MASK GENMASK(26, 24)
__le32 length;
__le64 src_addr;
__le64 dst_addr;
};
struct hisi_dma_cqe {
__le32 rsv0;
__le32 rsv1;
__le16 sq_head;
__le16 rsv2;
__le16 rsv3;
__le16 w0;
#define STATUS_MASK GENMASK(15, 1)
#define STATUS_SUCC 0x0
#define VALID_BIT BIT(0)
};
struct hisi_dma_desc {
struct virt_dma_desc vd;
struct hisi_dma_sqe sqe;
};
struct hisi_dma_chan {
struct virt_dma_chan vc;
struct hisi_dma_dev *hdma_dev;
struct hisi_dma_sqe *sq;
struct hisi_dma_cqe *cq;
dma_addr_t sq_dma;
dma_addr_t cq_dma;
u32 sq_tail;
u32 cq_head;
u32 qp_num;
enum hisi_dma_chan_status status;
struct hisi_dma_desc *desc;
};
struct hisi_dma_dev {
struct pci_dev *pdev;
void __iomem *base;
struct dma_device dma_dev;
u32 chan_num;
u32 chan_depth;
enum hisi_dma_reg_layout reg_layout;
void __iomem *queue_base; /* queue region start of register */
struct hisi_dma_chan chan[] __counted_by(chan_num);
};
#ifdef CONFIG_DEBUG_FS
static const struct debugfs_reg32 hisi_dma_comm_chan_regs[] = {
{"DMA_QUEUE_SQ_DEPTH ", 0x0008ull},
{"DMA_QUEUE_SQ_TAIL_PTR ", 0x000Cull},
{"DMA_QUEUE_CQ_DEPTH ", 0x0018ull},
{"DMA_QUEUE_CQ_HEAD_PTR ", 0x001Cull},
{"DMA_QUEUE_CTRL0 ", 0x0020ull},
{"DMA_QUEUE_CTRL1 ", 0x0024ull},
{"DMA_QUEUE_FSM_STS ", 0x0030ull},
{"DMA_QUEUE_SQ_STS ", 0x0034ull},
{"DMA_QUEUE_CQ_TAIL_PTR ", 0x003Cull},
{"DMA_QUEUE_INT_STS ", 0x0040ull},
{"DMA_QUEUE_INT_MSK ", 0x0044ull},
{"DMA_QUEUE_INT_RO ", 0x006Cull},
};
static const struct debugfs_reg32 hisi_dma_hip08_chan_regs[] = {
{"DMA_QUEUE_BYTE_CNT ", 0x0038ull},
{"DMA_ERR_INT_NUM6 ", 0x0048ull},
{"DMA_QUEUE_DESP0 ", 0x0050ull},
{"DMA_QUEUE_DESP1 ", 0x0054ull},
{"DMA_QUEUE_DESP2 ", 0x0058ull},
{"DMA_QUEUE_DESP3 ", 0x005Cull},
{"DMA_QUEUE_DESP4 ", 0x0074ull},
{"DMA_QUEUE_DESP5 ", 0x0078ull},
{"DMA_QUEUE_DESP6 ", 0x007Cull},
{"DMA_QUEUE_DESP7 ", 0x0080ull},
{"DMA_ERR_INT_NUM0 ", 0x0084ull},
{"DMA_ERR_INT_NUM1 ", 0x0088ull},
{"DMA_ERR_INT_NUM2 ", 0x008Cull},
{"DMA_ERR_INT_NUM3 ", 0x0090ull},
{"DMA_ERR_INT_NUM4 ", 0x0094ull},
{"DMA_ERR_INT_NUM5 ", 0x0098ull},
{"DMA_QUEUE_SQ_STS2 ", 0x00A4ull},
};
static const struct debugfs_reg32 hisi_dma_hip09_chan_regs[] = {
{"DMA_QUEUE_ERR_INT_STS ", 0x0048ull},
{"DMA_QUEUE_ERR_INT_MSK ", 0x004Cull},
{"DFX_SQ_READ_ERR_PTR ", 0x0068ull},
{"DFX_DMA_ERR_INT_NUM0 ", 0x0084ull},
{"DFX_DMA_ERR_INT_NUM1 ", 0x0088ull},
{"DFX_DMA_ERR_INT_NUM2 ", 0x008Cull},
{"DFX_DMA_QUEUE_SQ_STS2 ", 0x00A4ull},
};
static const struct debugfs_reg32 hisi_dma_hip08_comm_regs[] = {
{"DMA_ECC_ERR_ADDR ", 0x2004ull},
{"DMA_ECC_ECC_CNT ", 0x2014ull},
{"COMMON_AND_CH_ERR_STS ", 0x2030ull},
{"LOCAL_CPL_ID_STS_0 ", 0x20E0ull},
{"LOCAL_CPL_ID_STS_1 ", 0x20E4ull},
{"LOCAL_CPL_ID_STS_2 ", 0x20E8ull},
{"LOCAL_CPL_ID_STS_3 ", 0x20ECull},
{"LOCAL_TLP_NUM ", 0x2158ull},
{"SQCQ_TLP_NUM ", 0x2164ull},
{"CPL_NUM ", 0x2168ull},
{"INF_BACK_PRESS_STS ", 0x2170ull},
{"DMA_CH_RAS_LEVEL ", 0x2184ull},
{"DMA_CM_RAS_LEVEL ", 0x2188ull},
{"DMA_CH_ERR_STS ", 0x2190ull},
{"DMA_CH_DONE_STS ", 0x2194ull},
{"DMA_SQ_TAG_STS_0 ", 0x21A0ull},
{"DMA_SQ_TAG_STS_1 ", 0x21A4ull},
{"DMA_SQ_TAG_STS_2 ", 0x21A8ull},
{"DMA_SQ_TAG_STS_3 ", 0x21ACull},
{"LOCAL_P_ID_STS_0 ", 0x21B0ull},
{"LOCAL_P_ID_STS_1 ", 0x21B4ull},
{"LOCAL_P_ID_STS_2 ", 0x21B8ull},
{"LOCAL_P_ID_STS_3 ", 0x21BCull},
{"DMA_PREBUFF_INFO_0 ", 0x2200ull},
{"DMA_CM_TABLE_INFO_0 ", 0x2220ull},
{"DMA_CM_CE_RO ", 0x2244ull},
{"DMA_CM_NFE_RO ", 0x2248ull},
{"DMA_CM_FE_RO ", 0x224Cull},
};
static const struct debugfs_reg32 hisi_dma_hip09_comm_regs[] = {
{"COMMON_AND_CH_ERR_STS ", 0x0030ull},
{"DMA_PORT_IDLE_STS ", 0x0150ull},
{"DMA_CH_RAS_LEVEL ", 0x0184ull},
{"DMA_CM_RAS_LEVEL ", 0x0188ull},
{"DMA_CM_CE_RO ", 0x0244ull},
{"DMA_CM_NFE_RO ", 0x0248ull},
{"DMA_CM_FE_RO ", 0x024Cull},
{"DFX_INF_BACK_PRESS_STS0 ", 0x1A40ull},
{"DFX_INF_BACK_PRESS_STS1 ", 0x1A44ull},
{"DFX_INF_BACK_PRESS_STS2 ", 0x1A48ull},
{"DFX_DMA_WRR_DISABLE ", 0x1A4Cull},
{"DFX_PA_REQ_TLP_NUM ", 0x1C00ull},
{"DFX_PA_BACK_TLP_NUM ", 0x1C04ull},
{"DFX_PA_RETRY_TLP_NUM ", 0x1C08ull},
{"DFX_LOCAL_NP_TLP_NUM ", 0x1C0Cull},
{"DFX_LOCAL_CPL_HEAD_TLP_NUM ", 0x1C10ull},
{"DFX_LOCAL_CPL_DATA_TLP_NUM ", 0x1C14ull},
{"DFX_LOCAL_CPL_EXT_DATA_TLP_NUM ", 0x1C18ull},
{"DFX_LOCAL_P_HEAD_TLP_NUM ", 0x1C1Cull},
{"DFX_LOCAL_P_ACK_TLP_NUM ", 0x1C20ull},
{"DFX_BUF_ALOC_PORT_REQ_NUM ", 0x1C24ull},
{"DFX_BUF_ALOC_PORT_RESULT_NUM ", 0x1C28ull},
{"DFX_BUF_FAIL_SIZE_NUM ", 0x1C2Cull},
{"DFX_BUF_ALOC_SIZE_NUM ", 0x1C30ull},
{"DFX_BUF_NP_RELEASE_SIZE_NUM ", 0x1C34ull},
{"DFX_BUF_P_RELEASE_SIZE_NUM ", 0x1C38ull},
{"DFX_BUF_PORT_RELEASE_SIZE_NUM ", 0x1C3Cull},
{"DFX_DMA_PREBUF_MEM0_ECC_ERR_ADDR ", 0x1CA8ull},
{"DFX_DMA_PREBUF_MEM0_ECC_CNT ", 0x1CACull},
{"DFX_DMA_LOC_NP_OSTB_ECC_ERR_ADDR ", 0x1CB0ull},
{"DFX_DMA_LOC_NP_OSTB_ECC_CNT ", 0x1CB4ull},
{"DFX_DMA_PREBUF_MEM1_ECC_ERR_ADDR ", 0x1CC0ull},
{"DFX_DMA_PREBUF_MEM1_ECC_CNT ", 0x1CC4ull},
{"DMA_CH_DONE_STS ", 0x02E0ull},
{"DMA_CH_ERR_STS ", 0x0320ull},
};
#endif /* CONFIG_DEBUG_FS*/
static enum hisi_dma_reg_layout hisi_dma_get_reg_layout(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_REG_LAYOUT_HIP08;
else if (pdev->revision >= HISI_DMA_REVISION_HIP09A)
return HISI_DMA_REG_LAYOUT_HIP09;
return HISI_DMA_REG_LAYOUT_INVALID;
}
static u32 hisi_dma_get_chan_num(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_HIP08_CHAN_NUM;
return HISI_DMA_HIP09_CHAN_NUM;
}
static u32 hisi_dma_get_msi_num(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_HIP08_MSI_NUM;
return HISI_DMA_HIP09_MSI_NUM;
}
static u32 hisi_dma_get_queue_base(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_HIP08_Q_BASE;
return HISI_DMA_HIP09_Q_BASE;
}
static inline struct hisi_dma_chan *to_hisi_dma_chan(struct dma_chan *c)
{
return container_of(c, struct hisi_dma_chan, vc.chan);
}
static inline struct hisi_dma_desc *to_hisi_dma_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct hisi_dma_desc, vd);
}
static inline void hisi_dma_chan_write(void __iomem *base, u32 reg, u32 index,
u32 val)
{
writel_relaxed(val, base + reg + index * HISI_DMA_Q_OFFSET);
}
static inline void hisi_dma_update_bit(void __iomem *addr, u32 pos, bool val)
{
u32 tmp;
tmp = readl_relaxed(addr);
tmp = val ? tmp | pos : tmp & ~pos;
writel_relaxed(tmp, addr);
}
static void hisi_dma_pause_dma(struct hisi_dma_dev *hdma_dev, u32 index,
bool pause)
{
void __iomem *addr;
addr = hdma_dev->queue_base + HISI_DMA_Q_CTRL0 +
index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_Q_CTRL0_QUEUE_PAUSE, pause);
}
static void hisi_dma_enable_dma(struct hisi_dma_dev *hdma_dev, u32 index,
bool enable)
{
void __iomem *addr;
addr = hdma_dev->queue_base + HISI_DMA_Q_CTRL0 +
index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_Q_CTRL0_QUEUE_EN, enable);
}
static void hisi_dma_mask_irq(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
void __iomem *q_base = hdma_dev->queue_base;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_INT_MSK,
qp_index, HISI_DMA_HIP08_Q_INT_STS_MASK);
else {
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_INT_MSK,
qp_index, HISI_DMA_HIP09_Q_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_ERR_INT_MSK,
qp_index,
HISI_DMA_HIP09_Q_ERR_INT_STS_MASK);
}
}
static void hisi_dma_unmask_irq(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
void __iomem *q_base = hdma_dev->queue_base;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08) {
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_INT_STS,
qp_index, HISI_DMA_HIP08_Q_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_INT_MSK,
qp_index, 0);
} else {
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_INT_STS,
qp_index, HISI_DMA_HIP09_Q_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_ERR_INT_STS,
qp_index,
HISI_DMA_HIP09_Q_ERR_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_INT_MSK,
qp_index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_ERR_INT_MSK,
qp_index, 0);
}
}
static void hisi_dma_do_reset(struct hisi_dma_dev *hdma_dev, u32 index)
{
void __iomem *addr;
addr = hdma_dev->queue_base +
HISI_DMA_Q_CTRL1 + index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_Q_CTRL1_QUEUE_RESET, 1);
}
static void hisi_dma_reset_qp_point(struct hisi_dma_dev *hdma_dev, u32 index)
{
void __iomem *q_base = hdma_dev->queue_base;
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_TAIL_PTR, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_HEAD_PTR, index, 0);
}
static void hisi_dma_reset_or_disable_hw_chan(struct hisi_dma_chan *chan,
bool disable)
{
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
u32 index = chan->qp_num, tmp;
void __iomem *addr;
int ret;
hisi_dma_pause_dma(hdma_dev, index, true);
hisi_dma_enable_dma(hdma_dev, index, false);
hisi_dma_mask_irq(hdma_dev, index);
addr = hdma_dev->queue_base +
HISI_DMA_Q_FSM_STS + index * HISI_DMA_Q_OFFSET;
ret = readl_relaxed_poll_timeout(addr, tmp,
FIELD_GET(HISI_DMA_Q_FSM_STS_MASK, tmp) != RUN,
HISI_DMA_POLL_Q_STS_DELAY_US, HISI_DMA_POLL_Q_STS_TIME_OUT_US);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "disable channel timeout!\n");
WARN_ON(1);
}
hisi_dma_do_reset(hdma_dev, index);
hisi_dma_reset_qp_point(hdma_dev, index);
hisi_dma_pause_dma(hdma_dev, index, false);
if (!disable) {
hisi_dma_enable_dma(hdma_dev, index, true);
hisi_dma_unmask_irq(hdma_dev, index);
}
ret = readl_relaxed_poll_timeout(addr, tmp,
FIELD_GET(HISI_DMA_Q_FSM_STS_MASK, tmp) == IDLE,
HISI_DMA_POLL_Q_STS_DELAY_US, HISI_DMA_POLL_Q_STS_TIME_OUT_US);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "reset channel timeout!\n");
WARN_ON(1);
}
}
static void hisi_dma_free_chan_resources(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
hisi_dma_reset_or_disable_hw_chan(chan, false);
vchan_free_chan_resources(&chan->vc);
memset(chan->sq, 0, sizeof(struct hisi_dma_sqe) * hdma_dev->chan_depth);
memset(chan->cq, 0, sizeof(struct hisi_dma_cqe) * hdma_dev->chan_depth);
chan->sq_tail = 0;
chan->cq_head = 0;
chan->status = DISABLE;
}
static void hisi_dma_desc_free(struct virt_dma_desc *vd)
{
kfree(to_hisi_dma_desc(vd));
}
static struct dma_async_tx_descriptor *
hisi_dma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
struct hisi_dma_desc *desc;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->sqe.length = cpu_to_le32(len);
desc->sqe.src_addr = cpu_to_le64(src);
desc->sqe.dst_addr = cpu_to_le64(dst);
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
}
static enum dma_status
hisi_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(c, cookie, txstate);
}
static void hisi_dma_start_transfer(struct hisi_dma_chan *chan)
{
struct hisi_dma_sqe *sqe = chan->sq + chan->sq_tail;
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
struct hisi_dma_desc *desc;
struct virt_dma_desc *vd;
vd = vchan_next_desc(&chan->vc);
if (!vd) {
chan->desc = NULL;
return;
}
list_del(&vd->node);
desc = to_hisi_dma_desc(vd);
chan->desc = desc;
memcpy(sqe, &desc->sqe, sizeof(struct hisi_dma_sqe));
/* update other field in sqe */
sqe->dw0 = cpu_to_le32(FIELD_PREP(OPCODE_MASK, OPCODE_M2M));
sqe->dw0 |= cpu_to_le32(LOCAL_IRQ_EN);
/* make sure data has been updated in sqe */
wmb();
/* update sq tail, point to new sqe position */
chan->sq_tail = (chan->sq_tail + 1) % hdma_dev->chan_depth;
/* update sq_tail to trigger a new task */
hisi_dma_chan_write(hdma_dev->queue_base, HISI_DMA_Q_SQ_TAIL_PTR,
chan->qp_num, chan->sq_tail);
}
static void hisi_dma_issue_pending(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
unsigned long flags;
spin_lock_irqsave(&chan->vc.lock, flags);
if (vchan_issue_pending(&chan->vc) && !chan->desc)
hisi_dma_start_transfer(chan);
spin_unlock_irqrestore(&chan->vc.lock, flags);
}
static int hisi_dma_terminate_all(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&chan->vc.lock, flags);
hisi_dma_pause_dma(chan->hdma_dev, chan->qp_num, true);
if (chan->desc) {
vchan_terminate_vdesc(&chan->desc->vd);
chan->desc = NULL;
}
vchan_get_all_descriptors(&chan->vc, &head);
spin_unlock_irqrestore(&chan->vc.lock, flags);
vchan_dma_desc_free_list(&chan->vc, &head);
hisi_dma_pause_dma(chan->hdma_dev, chan->qp_num, false);
return 0;
}
static void hisi_dma_synchronize(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
vchan_synchronize(&chan->vc);
}
static int hisi_dma_alloc_qps_mem(struct hisi_dma_dev *hdma_dev)
{
size_t sq_size = sizeof(struct hisi_dma_sqe) * hdma_dev->chan_depth;
size_t cq_size = sizeof(struct hisi_dma_cqe) * hdma_dev->chan_depth;
struct device *dev = &hdma_dev->pdev->dev;
struct hisi_dma_chan *chan;
int i;
for (i = 0; i < hdma_dev->chan_num; i++) {
chan = &hdma_dev->chan[i];
chan->sq = dmam_alloc_coherent(dev, sq_size, &chan->sq_dma,
GFP_KERNEL);
if (!chan->sq)
return -ENOMEM;
chan->cq = dmam_alloc_coherent(dev, cq_size, &chan->cq_dma,
GFP_KERNEL);
if (!chan->cq)
return -ENOMEM;
}
return 0;
}
static void hisi_dma_init_hw_qp(struct hisi_dma_dev *hdma_dev, u32 index)
{
struct hisi_dma_chan *chan = &hdma_dev->chan[index];
void __iomem *q_base = hdma_dev->queue_base;
u32 hw_depth = hdma_dev->chan_depth - 1;
void __iomem *addr;
u32 tmp;
/* set sq, cq base */
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_BASE_L, index,
lower_32_bits(chan->sq_dma));
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_BASE_H, index,
upper_32_bits(chan->sq_dma));
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_BASE_L, index,
lower_32_bits(chan->cq_dma));
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_BASE_H, index,
upper_32_bits(chan->cq_dma));
/* set sq, cq depth */
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_DEPTH, index, hw_depth);
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_DEPTH, index, hw_depth);
/* init sq tail and cq head */
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_TAIL_PTR, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_HEAD_PTR, index, 0);
/* init error interrupt stats */
hisi_dma_chan_write(q_base, HISI_DMA_Q_ERR_INT_NUM0, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_ERR_INT_NUM1, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_ERR_INT_NUM2, index, 0);
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08) {
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM3,
index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM4,
index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM5,
index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM6,
index, 0);
/*
* init SQ/CQ direction selecting register.
* "0" is to local side and "1" is to remote side.
*/
addr = q_base + HISI_DMA_Q_CTRL0 + index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_HIP08_Q_CTRL0_SQCQ_DRCT, 0);
/*
* 0 - Continue to next descriptor if error occurs.
* 1 - Abort the DMA queue if error occurs.
*/
hisi_dma_update_bit(addr,
HISI_DMA_HIP08_Q_CTRL0_ERR_ABORT_EN, 0);
} else {
addr = q_base + HISI_DMA_Q_CTRL0 + index * HISI_DMA_Q_OFFSET;
/*
* init SQ/CQ direction selecting register.
* "0" is to local side and "1" is to remote side.
*/
hisi_dma_update_bit(addr, HISI_DMA_HIP09_Q_CTRL0_SQ_DRCT, 0);
hisi_dma_update_bit(addr, HISI_DMA_HIP09_Q_CTRL0_CQ_DRCT, 0);
/*
* 0 - Continue to next descriptor if error occurs.
* 1 - Abort the DMA queue if error occurs.
*/
tmp = readl_relaxed(addr);
tmp &= ~HISI_DMA_HIP09_Q_CTRL0_ERR_ABORT_EN;
writel_relaxed(tmp, addr);
/*
* 0 - dma should process FLR whith CPU.
* 1 - dma not process FLR, only cpu process FLR.
*/
addr = q_base + HISI_DMA_HIP09_DMA_FLR_DISABLE +
index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_HIP09_DMA_FLR_DISABLE_B, 0);
addr = q_base + HISI_DMA_Q_CTRL1 + index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_HIP09_Q_CTRL1_VA_ENABLE, 1);
}
}
static void hisi_dma_enable_qp(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
hisi_dma_init_hw_qp(hdma_dev, qp_index);
hisi_dma_unmask_irq(hdma_dev, qp_index);
hisi_dma_enable_dma(hdma_dev, qp_index, true);
}
static void hisi_dma_disable_qp(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
hisi_dma_reset_or_disable_hw_chan(&hdma_dev->chan[qp_index], true);
}
static void hisi_dma_enable_qps(struct hisi_dma_dev *hdma_dev)
{
int i;
for (i = 0; i < hdma_dev->chan_num; i++) {
hdma_dev->chan[i].qp_num = i;
hdma_dev->chan[i].hdma_dev = hdma_dev;
hdma_dev->chan[i].vc.desc_free = hisi_dma_desc_free;
vchan_init(&hdma_dev->chan[i].vc, &hdma_dev->dma_dev);
hisi_dma_enable_qp(hdma_dev, i);
}
}
static void hisi_dma_disable_qps(struct hisi_dma_dev *hdma_dev)
{
int i;
for (i = 0; i < hdma_dev->chan_num; i++) {
hisi_dma_disable_qp(hdma_dev, i);
tasklet_kill(&hdma_dev->chan[i].vc.task);
}
}
static irqreturn_t hisi_dma_irq(int irq, void *data)
{
struct hisi_dma_chan *chan = data;
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
struct hisi_dma_desc *desc;
struct hisi_dma_cqe *cqe;
void __iomem *q_base;
spin_lock(&chan->vc.lock);
desc = chan->desc;
cqe = chan->cq + chan->cq_head;
q_base = hdma_dev->queue_base;
if (desc) {
chan->cq_head = (chan->cq_head + 1) % hdma_dev->chan_depth;
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_HEAD_PTR,
chan->qp_num, chan->cq_head);
if (FIELD_GET(STATUS_MASK, cqe->w0) == STATUS_SUCC) {
vchan_cookie_complete(&desc->vd);
hisi_dma_start_transfer(chan);
} else {
dev_err(&hdma_dev->pdev->dev, "task error!\n");
}
}
spin_unlock(&chan->vc.lock);
return IRQ_HANDLED;
}
static int hisi_dma_request_qps_irq(struct hisi_dma_dev *hdma_dev)
{
struct pci_dev *pdev = hdma_dev->pdev;
int i, ret;
for (i = 0; i < hdma_dev->chan_num; i++) {
ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
hisi_dma_irq, IRQF_SHARED, "hisi_dma",
&hdma_dev->chan[i]);
if (ret)
return ret;
}
return 0;
}
/* This function enables all hw channels in a device */
static int hisi_dma_enable_hw_channels(struct hisi_dma_dev *hdma_dev)
{
int ret;
ret = hisi_dma_alloc_qps_mem(hdma_dev);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "fail to allocate qp memory!\n");
return ret;
}
ret = hisi_dma_request_qps_irq(hdma_dev);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "fail to request qp irq!\n");
return ret;
}
hisi_dma_enable_qps(hdma_dev);
return 0;
}
static void hisi_dma_disable_hw_channels(void *data)
{
hisi_dma_disable_qps(data);
}
static void hisi_dma_set_mode(struct hisi_dma_dev *hdma_dev,
enum hisi_dma_mode mode)
{
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
writel_relaxed(mode == RC ? 1 : 0,
hdma_dev->base + HISI_DMA_HIP08_MODE);
}
static void hisi_dma_init_hw(struct hisi_dma_dev *hdma_dev)
{
void __iomem *addr;
int i;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP09) {
for (i = 0; i < HISI_DMA_HIP09_MAX_PORT_NUM; i++) {
addr = hdma_dev->base + HISI_DMA_HIP09_PORT_CFG_REG(i);
hisi_dma_update_bit(addr,
HISI_DMA_HIP09_PORT_CFG_LINK_DOWN_MASK_B, 1);
}
}
}
static void hisi_dma_init_dma_dev(struct hisi_dma_dev *hdma_dev)
{
struct dma_device *dma_dev;
dma_dev = &hdma_dev->dma_dev;
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_dev->device_free_chan_resources = hisi_dma_free_chan_resources;
dma_dev->device_prep_dma_memcpy = hisi_dma_prep_dma_memcpy;
dma_dev->device_tx_status = hisi_dma_tx_status;
dma_dev->device_issue_pending = hisi_dma_issue_pending;
dma_dev->device_terminate_all = hisi_dma_terminate_all;
dma_dev->device_synchronize = hisi_dma_synchronize;
dma_dev->directions = BIT(DMA_MEM_TO_MEM);
dma_dev->dev = &hdma_dev->pdev->dev;
INIT_LIST_HEAD(&dma_dev->channels);
}
/* --- debugfs implementation --- */
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
static struct debugfs_reg32 *hisi_dma_get_ch_regs(struct hisi_dma_dev *hdma_dev,
u32 *regs_sz)
{
struct device *dev = &hdma_dev->pdev->dev;
struct debugfs_reg32 *regs;
u32 regs_sz_comm;
regs_sz_comm = ARRAY_SIZE(hisi_dma_comm_chan_regs);
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
*regs_sz = regs_sz_comm + ARRAY_SIZE(hisi_dma_hip08_chan_regs);
else
*regs_sz = regs_sz_comm + ARRAY_SIZE(hisi_dma_hip09_chan_regs);
regs = devm_kcalloc(dev, *regs_sz, sizeof(struct debugfs_reg32),
GFP_KERNEL);
if (!regs)
return NULL;
memcpy(regs, hisi_dma_comm_chan_regs, sizeof(hisi_dma_comm_chan_regs));
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
memcpy(regs + regs_sz_comm, hisi_dma_hip08_chan_regs,
sizeof(hisi_dma_hip08_chan_regs));
else
memcpy(regs + regs_sz_comm, hisi_dma_hip09_chan_regs,
sizeof(hisi_dma_hip09_chan_regs));
return regs;
}
static int hisi_dma_create_chan_dir(struct hisi_dma_dev *hdma_dev)
{
char dir_name[HISI_DMA_MAX_DIR_NAME_LEN];
struct debugfs_regset32 *regsets;
struct debugfs_reg32 *regs;
struct dentry *chan_dir;
struct device *dev;
u32 regs_sz;
int ret;
int i;
dev = &hdma_dev->pdev->dev;
regsets = devm_kcalloc(dev, hdma_dev->chan_num,
sizeof(*regsets), GFP_KERNEL);
if (!regsets)
return -ENOMEM;
regs = hisi_dma_get_ch_regs(hdma_dev, &regs_sz);
if (!regs)
return -ENOMEM;
for (i = 0; i < hdma_dev->chan_num; i++) {
regsets[i].regs = regs;
regsets[i].nregs = regs_sz;
regsets[i].base = hdma_dev->queue_base + i * HISI_DMA_Q_OFFSET;
regsets[i].dev = dev;
memset(dir_name, 0, HISI_DMA_MAX_DIR_NAME_LEN);
ret = sprintf(dir_name, "channel%d", i);
if (ret < 0)
return ret;
chan_dir = debugfs_create_dir(dir_name,
hdma_dev->dma_dev.dbg_dev_root);
debugfs_create_regset32("regs", 0444, chan_dir, &regsets[i]);
}
return 0;
}
static void hisi_dma_create_debugfs(struct hisi_dma_dev *hdma_dev)
{
struct debugfs_regset32 *regset;
struct device *dev;
int ret;
dev = &hdma_dev->pdev->dev;
if (hdma_dev->dma_dev.dbg_dev_root == NULL)
return;
regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
if (!regset)
return;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08) {
regset->regs = hisi_dma_hip08_comm_regs;
regset->nregs = ARRAY_SIZE(hisi_dma_hip08_comm_regs);
} else {
regset->regs = hisi_dma_hip09_comm_regs;
regset->nregs = ARRAY_SIZE(hisi_dma_hip09_comm_regs);
}
regset->base = hdma_dev->base;
regset->dev = dev;
debugfs_create_regset32("regs", 0444,
hdma_dev->dma_dev.dbg_dev_root, regset);
ret = hisi_dma_create_chan_dir(hdma_dev);
if (ret < 0)
dev_info(&hdma_dev->pdev->dev, "fail to create debugfs for channels!\n");
}
#else
static void hisi_dma_create_debugfs(struct hisi_dma_dev *hdma_dev) { }
#endif /* CONFIG_DEBUG_FS*/
/* --- debugfs implementation --- */
static int hisi_dma_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
enum hisi_dma_reg_layout reg_layout;
struct device *dev = &pdev->dev;
struct hisi_dma_dev *hdma_dev;
struct dma_device *dma_dev;
u32 chan_num;
u32 msi_num;
int ret;
reg_layout = hisi_dma_get_reg_layout(pdev);
if (reg_layout == HISI_DMA_REG_LAYOUT_INVALID) {
dev_err(dev, "unsupported device!\n");
return -EINVAL;
}
ret = pcim_enable_device(pdev);
if (ret) {
dev_err(dev, "failed to enable device mem!\n");
return ret;
}
ret = pcim_iomap_regions(pdev, 1 << PCI_BAR_2, pci_name(pdev));
if (ret) {
dev_err(dev, "failed to remap I/O region!\n");
return ret;
}
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (ret)
return ret;
chan_num = hisi_dma_get_chan_num(pdev);
hdma_dev = devm_kzalloc(dev, struct_size(hdma_dev, chan, chan_num),
GFP_KERNEL);
if (!hdma_dev)
return -EINVAL;
hdma_dev->base = pcim_iomap_table(pdev)[PCI_BAR_2];
hdma_dev->pdev = pdev;
hdma_dev->chan_depth = HISI_DMA_Q_DEPTH_VAL;
hdma_dev->chan_num = chan_num;
hdma_dev->reg_layout = reg_layout;
hdma_dev->queue_base = hdma_dev->base + hisi_dma_get_queue_base(pdev);
pci_set_drvdata(pdev, hdma_dev);
pci_set_master(pdev);
msi_num = hisi_dma_get_msi_num(pdev);
/* This will be freed by 'pcim_release()'. See 'pcim_enable_device()' */
ret = pci_alloc_irq_vectors(pdev, msi_num, msi_num, PCI_IRQ_MSI);
if (ret < 0) {
dev_err(dev, "Failed to allocate MSI vectors!\n");
return ret;
}
hisi_dma_init_dma_dev(hdma_dev);
hisi_dma_set_mode(hdma_dev, RC);
hisi_dma_init_hw(hdma_dev);
ret = hisi_dma_enable_hw_channels(hdma_dev);
if (ret < 0) {
dev_err(dev, "failed to enable hw channel!\n");
return ret;
}
ret = devm_add_action_or_reset(dev, hisi_dma_disable_hw_channels,
hdma_dev);
if (ret)
return ret;
dma_dev = &hdma_dev->dma_dev;
ret = dmaenginem_async_device_register(dma_dev);
if (ret < 0) {
dev_err(dev, "failed to register device!\n");
return ret;
}
hisi_dma_create_debugfs(hdma_dev);
return 0;
}
static const struct pci_device_id hisi_dma_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_HUAWEI, 0xa122) },
{ 0, }
};
static struct pci_driver hisi_dma_pci_driver = {
.name = "hisi_dma",
.id_table = hisi_dma_pci_tbl,
.probe = hisi_dma_probe,
};
module_pci_driver(hisi_dma_pci_driver);
MODULE_AUTHOR("Zhou Wang <wangzhou1@hisilicon.com>");
MODULE_AUTHOR("Zhenfa Qiu <qiuzhenfa@hisilicon.com>");
MODULE_DESCRIPTION("HiSilicon Kunpeng DMA controller driver");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(pci, hisi_dma_pci_tbl);
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