On 20 3月 23 14:53:23, Serge Semin wrote: > On Wed, Mar 15, 2023 at 09:28:35AM +0800, Cai Huoqing wrote: > > From: Cai huoqing <cai.huoqing@xxxxxxxxx> > > > > Add HDMA DebugFS support to show register information > > > > Signed-off-by: Cai huoqing <cai.huoqing@xxxxxxxxx> > > --- > > v6->v7: > > 1.Move the change of register file from patch[4/5] to patch[3/5]. > > v6 link: > > https://lore.kernel.org/lkml/20230310032342.17395-5-cai.huoqing@xxxxxxxxx/ > > > > drivers/dma/dw-edma/Makefile | 3 +- > > drivers/dma/dw-edma/dw-hdma-v0-core.c | 2 + > > drivers/dma/dw-edma/dw-hdma-v0-debugfs.c | 176 +++++++++++++++++++++++ > > drivers/dma/dw-edma/dw-hdma-v0-debugfs.h | 22 +++ > > 4 files changed, 202 insertions(+), 1 deletion(-) > > create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-debugfs.c > > create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-debugfs.h > > > > diff --git a/drivers/dma/dw-edma/Makefile b/drivers/dma/dw-edma/Makefile > > index b1c91ef2c63d..83ab58f87760 100644 > > --- a/drivers/dma/dw-edma/Makefile > > +++ b/drivers/dma/dw-edma/Makefile > > @@ -1,7 +1,8 @@ > > # SPDX-License-Identifier: GPL-2.0 > > > > obj-$(CONFIG_DW_EDMA) += dw-edma.o > > -dw-edma-$(CONFIG_DEBUG_FS) := dw-edma-v0-debugfs.o > > +dw-edma-$(CONFIG_DEBUG_FS) := dw-edma-v0-debugfs.o \ > > + dw-hdma-v0-debugfs.o > > dw-edma-objs := dw-edma-core.o \ > > dw-edma-v0-core.o \ > > dw-hdma-v0-core.o $(dw-edma-y) > > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c > > index cf274231cda9..b540c9ad7dfb 100644 > > --- a/drivers/dma/dw-edma/dw-hdma-v0-core.c > > +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c > > @@ -11,6 +11,7 @@ > > #include "dw-edma-core.h" > > #include "dw-hdma-v0-core.h" > > #include "dw-hdma-v0-regs.h" > > +#include "dw-hdma-v0-debugfs.h" > > > > enum dw_hdma_control { > > DW_HDMA_V0_CB = BIT(0), > > @@ -257,6 +258,7 @@ static void dw_hdma_v0_core_ch_config(struct dw_edma_chan *chan) > > /* HDMA debugfs callbacks */ > > static void dw_hdma_v0_core_debugfs_on(struct dw_edma *dw) > > { > > + dw_hdma_v0_debugfs_on(dw); > > } > > > > static const struct dw_edma_core_ops dw_hdma_v0_core = { > > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-debugfs.c b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.c > > new file mode 100644 > > index 000000000000..f2082b1bf72a > > --- /dev/null > > +++ b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.c > > @@ -0,0 +1,176 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Copyright (c) 2023 Cai Huoqing > > + * Synopsys DesignWare HDMA v0 debugfs > > + * > > + * Author: Cai Huoqing <cai.huoqing@xxxxxxxxx> > > + */ > > + > > +#include <linux/debugfs.h> > > +#include <linux/bitfield.h> > > + > > +#include "dw-hdma-v0-debugfs.h" > > +#include "dw-hdma-v0-regs.h" > > +#include "dw-edma-core.h" > > + > > +#define REGS_ADDR(dw, name) \ > > + ({ \ > > + struct dw_hdma_v0_regs __iomem *__regs = (dw)->chip->reg_base; \ > > + \ > > + (void __iomem *)&__regs->name; \ > > + }) > > + > > +#define REGS_CH_ADDR(dw, name, _dir, _ch) \ > > + ({ \ > > + struct dw_hdma_v0_ch_regs __iomem *__ch_regs; \ > > + \ > > + if (_dir == EDMA_DIR_READ) \ > > + __ch_regs = REGS_ADDR(dw, ch[_ch].rd); \ > > + else \ > > + __ch_regs = REGS_ADDR(dw, ch[_ch].wr); \ > > + \ > > + (void __iomem *)&__ch_regs->name; \ > > + }) > > + > > +#define CTX_REGISTER(dw, name, dir, ch) \ > > + { dw, #name, REGS_CH_ADDR(dw, name, dir, ch), dir, ch } > > + > > +#define REGISTER(dw, name) \ > > + { dw, #name, REGS_ADDR(dw, name) } > > + > > +#define WRITE_STR "write" > > +#define READ_STR "read" > > +#define CHANNEL_STR "channel" > > +#define REGISTERS_STR "registers" > > + > > +struct dw_hdma_debugfs_entry { > > + struct dw_edma *dw; > > + const char *name; > > + void __iomem *reg; > > > + enum dw_edma_dir dir; > > + u16 ch; > > Fields above seems like unused. What about dropping them? > * Note the CTX_REGISTER() initializer will need to be fixed too. Do you mean that, CTX_REGISTER() like this +#define CTX_REGISTER(dw, name, dir, ch) \ + {#name, REGS_CH_ADDR(dw, name, dir, ch)} dw_hdma_debug_debugfs_entry will be changed to +struct dw_hdma_debugfs_entry { + const char *name; + void __iomem *reg; +}; right? Thanks, -Cai > > BTW it doesn't seem like HDMA will ever need the fields above, does it? > In case of DW eDMA they were necessary to perform the viewport-based > access of the CSR. AFAICS HDMA has always unrolled CSRs mapping. > Am I right? > > Other than that looks good. > > -Serge(y) > > > +}; > > + > > +static int dw_hdma_debugfs_u32_get(void *data, u64 *val) > > +{ > > + struct dw_hdma_debugfs_entry *entry = data; > > + void __iomem *reg = entry->reg; > > + > > + *val = readl(reg); > > + > > + return 0; > > +} > > +DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, dw_hdma_debugfs_u32_get, NULL, "0x%08llx\n"); > > + > > +static void dw_hdma_debugfs_create_x32(struct dw_edma *dw, > > + const struct dw_hdma_debugfs_entry ini[], > > + int nr_entries, struct dentry *dent) > > +{ > > + struct dw_hdma_debugfs_entry *entries; > > + int i; > > + > > + entries = devm_kcalloc(dw->chip->dev, nr_entries, sizeof(*entries), > > + GFP_KERNEL); > > + if (!entries) > > + return; > > + > > + for (i = 0; i < nr_entries; i++) { > > + entries[i] = ini[i]; > > + > > + debugfs_create_file_unsafe(entries[i].name, 0444, dent, > > + &entries[i], &fops_x32); > > + } > > +} > > + > > +static void dw_hdma_debugfs_regs_ch(struct dw_edma *dw, enum dw_edma_dir dir, > > + u16 ch, struct dentry *dent) > > +{ > > + const struct dw_hdma_debugfs_entry debugfs_regs[] = { > > + CTX_REGISTER(dw, ch_en, dir, ch), > > + CTX_REGISTER(dw, doorbell, dir, ch), > > + CTX_REGISTER(dw, prefetch, dir, ch), > > + CTX_REGISTER(dw, handshake, dir, ch), > > + CTX_REGISTER(dw, llp.lsb, dir, ch), > > + CTX_REGISTER(dw, llp.msb, dir, ch), > > + CTX_REGISTER(dw, cycle_sync, dir, ch), > > + CTX_REGISTER(dw, transfer_size, dir, ch), > > + CTX_REGISTER(dw, sar.lsb, dir, ch), > > + CTX_REGISTER(dw, sar.msb, dir, ch), > > + CTX_REGISTER(dw, dar.lsb, dir, ch), > > + CTX_REGISTER(dw, dar.msb, dir, ch), > > + CTX_REGISTER(dw, watermark_en, dir, ch), > > + CTX_REGISTER(dw, control1, dir, ch), > > + CTX_REGISTER(dw, func_num, dir, ch), > > + CTX_REGISTER(dw, qos, dir, ch), > > + CTX_REGISTER(dw, ch_stat, dir, ch), > > + CTX_REGISTER(dw, int_stat, dir, ch), > > + CTX_REGISTER(dw, int_setup, dir, ch), > > + CTX_REGISTER(dw, int_clear, dir, ch), > > + CTX_REGISTER(dw, msi_stop.lsb, dir, ch), > > + CTX_REGISTER(dw, msi_stop.msb, dir, ch), > > + CTX_REGISTER(dw, msi_watermark.lsb, dir, ch), > > + CTX_REGISTER(dw, msi_watermark.msb, dir, ch), > > + CTX_REGISTER(dw, msi_abort.lsb, dir, ch), > > + CTX_REGISTER(dw, msi_abort.msb, dir, ch), > > + CTX_REGISTER(dw, msi_msgdata, dir, ch), > > + }; > > + int nr_entries = ARRAY_SIZE(debugfs_regs); > > + > > + dw_hdma_debugfs_create_x32(dw, debugfs_regs, nr_entries, dent); > > +} > > + > > +static void dw_hdma_debugfs_regs_wr(struct dw_edma *dw, struct dentry *dent) > > +{ > > + struct dentry *regs_dent, *ch_dent; > > + char name[16]; > > + int i; > > + > > + regs_dent = debugfs_create_dir(WRITE_STR, dent); > > + > > + for (i = 0; i < dw->wr_ch_cnt; i++) { > > + snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i); > > + > > + ch_dent = debugfs_create_dir(name, regs_dent); > > + > > + dw_hdma_debugfs_regs_ch(dw, EDMA_DIR_WRITE, i, ch_dent); > > + } > > +} > > + > > +static void dw_hdma_debugfs_regs_rd(struct dw_edma *dw, struct dentry *dent) > > +{ > > + struct dentry *regs_dent, *ch_dent; > > + char name[16]; > > + int i; > > + > > + regs_dent = debugfs_create_dir(READ_STR, dent); > > + > > + for (i = 0; i < dw->rd_ch_cnt; i++) { > > + snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i); > > + > > + ch_dent = debugfs_create_dir(name, regs_dent); > > + > > + dw_hdma_debugfs_regs_ch(dw, EDMA_DIR_READ, i, ch_dent); > > + } > > +} > > + > > +static void dw_hdma_debugfs_regs(struct dw_edma *dw) > > +{ > > + struct dentry *regs_dent; > > + > > + regs_dent = debugfs_create_dir(REGISTERS_STR, dw->dma.dbg_dev_root); > > + > > + dw_hdma_debugfs_regs_wr(dw, regs_dent); > > + dw_hdma_debugfs_regs_rd(dw, regs_dent); > > +} > > + > > +void dw_hdma_v0_debugfs_on(struct dw_edma *dw) > > +{ > > + if (!debugfs_initialized()) > > + return; > > + > > + debugfs_create_u32("mf", 0444, dw->dma.dbg_dev_root, &dw->chip->mf); > > + debugfs_create_u16("wr_ch_cnt", 0444, dw->dma.dbg_dev_root, &dw->wr_ch_cnt); > > + debugfs_create_u16("rd_ch_cnt", 0444, dw->dma.dbg_dev_root, &dw->rd_ch_cnt); > > + > > + dw_hdma_debugfs_regs(dw); > > +} > > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-debugfs.h b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.h > > new file mode 100644 > > index 000000000000..e6842c83777d > > --- /dev/null > > +++ b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.h > > @@ -0,0 +1,22 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (c) 2023 Cai Huoqing > > + * Synopsys DesignWare HDMA v0 debugfs > > + * > > + * Author: Cai Huoqing <cai.huoqing@xxxxxxxxx> > > + */ > > + > > +#ifndef _DW_HDMA_V0_DEBUG_FS_H > > +#define _DW_HDMA_V0_DEBUG_FS_H > > + > > +#include <linux/dma/edma.h> > > + > > +#ifdef CONFIG_DEBUG_FS > > +void dw_hdma_v0_debugfs_on(struct dw_edma *dw); > > +#else > > +static inline void dw_hdma_v0_debugfs_on(struct dw_edma *dw) > > +{ > > +} > > +#endif /* CONFIG_DEBUG_FS */ > > + > > +#endif /* _DW_HDMA_V0_DEBUG_FS_H */ > > -- > > 2.34.1 > >
