Re: [PATCH v6 1/9] dmaengine: dw-edma: Detach the private data and chip info structures

[Serge Semin <fancer.lancer@gmail.com>]

Hello Frank

On Wed, Apr 06, 2022 at 10:23:39AM -0500, Frank Li wrote:
> "struct dw_edma_chip" contains an internal structure "struct dw_edma" that
> is used by the eDMA core internally. This structure should not be touched
> by the eDMA controller drivers themselves. But currently, the eDMA
> controller drivers like "dw-edma-pci" allocates and populates this
> internal structure then passes it on to eDMA core. The eDMA core further
> populates the structure and uses it. This is wrong!
> 
> Hence, move all the "struct dw_edma" specifics from controller drivers
> to the eDMA core.
> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
> Change from v5 to v6
>  - Don't touch chip->nr_irqs
>  - Don't set chip->dw utill everything is okay
>  - dw_edma_channel_setup() and dw_edma_v0_core_debugfs_on/off() methods take
>    dw_edma structure pointer as a parameter

Thanks for the updates. Some more comments are below.

> 
> Change from v4 to v5
>  - Move chip->nr_irqs before allocate dw_edma
> Change from v3 to v4
>  - Accept most suggestions of Serge Semin
> Change from v2 to v3
>  - none
> Change from v1 to v2
>  - rework commit message
>  - remove duplicate field in struct dw_edma
> 
>  drivers/dma/dw-edma/dw-edma-core.c       | 86 +++++++++++++-----------
>  drivers/dma/dw-edma/dw-edma-core.h       | 31 +--------
>  drivers/dma/dw-edma/dw-edma-pcie.c       | 82 ++++++++++------------
>  drivers/dma/dw-edma/dw-edma-v0-core.c    | 32 ++++-----
>  drivers/dma/dw-edma/dw-edma-v0-core.h    |  4 +-
>  drivers/dma/dw-edma/dw-edma-v0-debugfs.c | 10 +--
>  include/linux/dma/edma.h                 | 44 ++++++++++++
>  7 files changed, 151 insertions(+), 138 deletions(-)
> 
> diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
> index 53289927dd0d6..9e88797916268 100644
> --- a/drivers/dma/dw-edma/dw-edma-core.c
> +++ b/drivers/dma/dw-edma/dw-edma-core.c
> @@ -65,7 +65,7 @@ static struct dw_edma_burst *dw_edma_alloc_burst(struct dw_edma_chunk *chunk)
>  static struct dw_edma_chunk *dw_edma_alloc_chunk(struct dw_edma_desc *desc)
>  {
+	struct dw_edma_chip *chip = desc->chan->dw->chip;<-+
>  	struct dw_edma_chan *chan = desc->chan;            |
> -	struct dw_edma *dw = chan->chip->dw;               |
> +	struct dw_edma_chip *chip = chan->dw->chip;--------+

Please move this line there in order to preserve the reverse xmas tree
convention followed in this driver.

>  	struct dw_edma_chunk *chunk;
>  
>  	chunk = kzalloc(sizeof(*chunk), GFP_NOWAIT);
> @@ -82,11 +82,11 @@ static struct dw_edma_chunk *dw_edma_alloc_chunk(struct dw_edma_desc *desc)
>  	 */
>  	chunk->cb = !(desc->chunks_alloc % 2);
>  	if (chan->dir == EDMA_DIR_WRITE) {
> -		chunk->ll_region.paddr = dw->ll_region_wr[chan->id].paddr;
> -		chunk->ll_region.vaddr = dw->ll_region_wr[chan->id].vaddr;
> +		chunk->ll_region.paddr = chip->ll_region_wr[chan->id].paddr;
> +		chunk->ll_region.vaddr = chip->ll_region_wr[chan->id].vaddr;
>  	} else {
> -		chunk->ll_region.paddr = dw->ll_region_rd[chan->id].paddr;
> -		chunk->ll_region.vaddr = dw->ll_region_rd[chan->id].vaddr;
> +		chunk->ll_region.paddr = chip->ll_region_rd[chan->id].paddr;
> +		chunk->ll_region.vaddr = chip->ll_region_rd[chan->id].vaddr;
>  	}
>  
>  	if (desc->chunk) {
> @@ -664,7 +664,7 @@ static int dw_edma_alloc_chan_resources(struct dma_chan *dchan)
>  	if (chan->status != EDMA_ST_IDLE)
>  		return -EBUSY;
>  
> -	pm_runtime_get(chan->chip->dev);
> +	pm_runtime_get(chan->dw->chip->dev);
>  
>  	return 0;
>  }
> @@ -686,15 +686,15 @@ static void dw_edma_free_chan_resources(struct dma_chan *dchan)
>  		cpu_relax();
>  	}
>  
> -	pm_runtime_put(chan->chip->dev);
> +	pm_runtime_put(chan->dw->chip->dev);
>  }
>  
> -static int dw_edma_channel_setup(struct dw_edma_chip *chip, bool write,
> +static int dw_edma_channel_setup(struct dw_edma *dw, bool write,
>  				 u32 wr_alloc, u32 rd_alloc)
>  {
> +	struct dw_edma_chip *chip = dw->chip;
>  	struct dw_edma_region *dt_region;
>  	struct device *dev = chip->dev;
> -	struct dw_edma *dw = chip->dw;
>  	struct dw_edma_chan *chan;
>  	struct dw_edma_irq *irq;
>  	struct dma_device *dma;
> @@ -727,7 +727,7 @@ static int dw_edma_channel_setup(struct dw_edma_chip *chip, bool write,
>  
>  		chan->vc.chan.private = dt_region;
>  
> -		chan->chip = chip;
> +		chan->dw = dw;
>  		chan->id = j;
>  		chan->dir = write ? EDMA_DIR_WRITE : EDMA_DIR_READ;
>  		chan->configured = false;
> @@ -735,9 +735,9 @@ static int dw_edma_channel_setup(struct dw_edma_chip *chip, bool write,
>  		chan->status = EDMA_ST_IDLE;
>  
>  		if (write)
> -			chan->ll_max = (dw->ll_region_wr[j].sz / EDMA_LL_SZ);
> +			chan->ll_max = (chip->ll_region_wr[j].sz / EDMA_LL_SZ);
>  		else
> -			chan->ll_max = (dw->ll_region_rd[j].sz / EDMA_LL_SZ);
> +			chan->ll_max = (chip->ll_region_rd[j].sz / EDMA_LL_SZ);
>  		chan->ll_max -= 1;
>  
>  		dev_vdbg(dev, "L. List:\tChannel %s[%u] max_cnt=%u\n",
> @@ -767,13 +767,13 @@ static int dw_edma_channel_setup(struct dw_edma_chip *chip, bool write,
>  		vchan_init(&chan->vc, dma);
>  
>  		if (write) {
> -			dt_region->paddr = dw->dt_region_wr[j].paddr;
> -			dt_region->vaddr = dw->dt_region_wr[j].vaddr;
> -			dt_region->sz = dw->dt_region_wr[j].sz;
> +			dt_region->paddr = chip->dt_region_wr[j].paddr;
> +			dt_region->vaddr = chip->dt_region_wr[j].vaddr;
> +			dt_region->sz = chip->dt_region_wr[j].sz;
>  		} else {
> -			dt_region->paddr = dw->dt_region_rd[j].paddr;
> -			dt_region->vaddr = dw->dt_region_rd[j].vaddr;
> -			dt_region->sz = dw->dt_region_rd[j].sz;
> +			dt_region->paddr = chip->dt_region_rd[j].paddr;
> +			dt_region->vaddr = chip->dt_region_rd[j].vaddr;
> +			dt_region->sz = chip->dt_region_rd[j].sz;
>  		}
>  
>  		dw_edma_v0_core_device_config(chan);
> @@ -827,11 +827,10 @@ static inline void dw_edma_add_irq_mask(u32 *mask, u32 alloc, u16 cnt)
>  		(*mask)++;
>  }
>  
> -static int dw_edma_irq_request(struct dw_edma_chip *chip,
> +static int dw_edma_irq_request(struct dw_edma *dw,
>  			       u32 *wr_alloc, u32 *rd_alloc)
>  {
> -	struct device *dev = chip->dev;
> -	struct dw_edma *dw = chip->dw;
> +	struct device *dev = dw->chip->dev;
>  	u32 wr_mask = 1;
>  	u32 rd_mask = 1;
>  	int i, err = 0;
> @@ -845,7 +844,7 @@ static int dw_edma_irq_request(struct dw_edma_chip *chip,
>  

>  	if (dw->nr_irqs == 1) {

See my next comments for the details regarding initializing
dw->nr_irqs only after all necessary IRQs are requested.

>  		/* Common IRQ shared among all channels */
> -		irq = dw->ops->irq_vector(dev, 0);
> +		irq = dw->chip->ops->irq_vector(dev, 0);
>  		err = request_irq(irq, dw_edma_interrupt_common,
>  				  IRQF_SHARED, dw->name, &dw->irq[0]);
>  		if (err) {
> @@ -868,7 +867,7 @@ static int dw_edma_irq_request(struct dw_edma_chip *chip,
>  		dw_edma_add_irq_mask(&rd_mask, *rd_alloc, dw->rd_ch_cnt);
>  
>  		for (i = 0; i < (*wr_alloc + *rd_alloc); i++) {
> -			irq = dw->ops->irq_vector(dev, i);
> +			irq = dw->chip->ops->irq_vector(dev, i);
>  			err = request_irq(irq,
>  					  i < *wr_alloc ?
>  						dw_edma_interrupt_write :
> @@ -902,20 +901,23 @@ int dw_edma_probe(struct dw_edma_chip *chip)
>  		return -EINVAL;
>  
>  	dev = chip->dev;
> -	if (!dev)

> +	if (!dev || !chip->nr_irqs || !chip->ops)
>  		return -EINVAL;
>  
> -	dw = chip->dw;
> -	if (!dw || !dw->irq || !dw->ops || !dw->ops->irq_vector)

Why have you dropped the dw->ops->irq_vector checking here? It doesn't
seem right. In addition you've introduced a new failure condition
here: chip->nr_irqs must be non zero. First of all since nr_irqs is of
the signed integer type, you imply that having a negative value is ok
(which we know is not). Secondly nr_irqs is checked by the
dw_edma_irq_request() method too. So you are doing a double work here.

What I would suggest is to move the chip->nr_irqs and ops->irq_vector
tests from here into the dw_edma_irq_request() method, thus having the
later one more coherent.

Regarding the dw->irq field. I know it's unused in the core driver so
we can freely drop it. But the removal is done in another patch thus
partly doing that here isn't right. What you need to do is just to
move the "dmaengine: dw-edma: Remove unused field irq in struct
dw_edma_chip" patch to being applied before this one and completely
get rid from that field in that patch.

> -		return -EINVAL;
> +	dw = devm_kzalloc(dev, sizeof(*dw), GFP_KERNEL);
> +	if (!dw)
> +		return -ENOMEM;
> +
> +	dw->chip = chip;

> +	dw->nr_irqs = nr_irqs;

Judging by the context, this modification must be causing the
"undefined reference" compilation error. The nr_irqs term seems
undefined. Have you even tried to build the kernel with this
patch/series applied?

Anyway let's move the dw->nr_irqs initialization from here into the
dw_edma_irq_request() method. Do that only after either all the IRQs
are requested (dw->nr_irqs = 1 or dw->nr_irqs = i) or if an error is
encountered meantime the IRQs request procedure (dw->nr_irqs = i).

>  
>  	raw_spin_lock_init(&dw->lock);
>  
> -	dw->wr_ch_cnt = min_t(u16, dw->wr_ch_cnt,
> +	dw->wr_ch_cnt = min_t(u16, chip->wr_ch_cnt,
>  			      dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE));
>  	dw->wr_ch_cnt = min_t(u16, dw->wr_ch_cnt, EDMA_MAX_WR_CH);
>  
> -	dw->rd_ch_cnt = min_t(u16, dw->rd_ch_cnt,
> +	dw->rd_ch_cnt = min_t(u16, chip->rd_ch_cnt,
>  			      dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ));
>  	dw->rd_ch_cnt = min_t(u16, dw->rd_ch_cnt, EDMA_MAX_RD_CH);
>  
> @@ -936,18 +938,22 @@ int dw_edma_probe(struct dw_edma_chip *chip)
>  	/* Disable eDMA, only to establish the ideal initial conditions */
>  	dw_edma_v0_core_off(dw);
>  

> +	dw->irq = devm_kcalloc(dev, chip->nr_irqs, sizeof(*dw->irq), GFP_KERNEL);
> +	if (!dw->irq)
> +		return -ENOMEM;
> +

The allocation can be also moved to the dw_edma_irq_request() method.
But perform the allocation only after making sure that chip->nr_irqs
and chip->ops->irq_vector are valid.

>  	/* Request IRQs */
> -	err = dw_edma_irq_request(chip, &wr_alloc, &rd_alloc);
> +	err = dw_edma_irq_request(dw, &wr_alloc, &rd_alloc);
>  	if (err)
>  		return err;
>  
>  	/* Setup write channels */
> -	err = dw_edma_channel_setup(chip, true, wr_alloc, rd_alloc);
> +	err = dw_edma_channel_setup(dw, true, wr_alloc, rd_alloc);
>  	if (err)
>  		goto err_irq_free;
>  
>  	/* Setup read channels */
> -	err = dw_edma_channel_setup(chip, false, wr_alloc, rd_alloc);
> +	err = dw_edma_channel_setup(dw, false, wr_alloc, rd_alloc);
>  	if (err)
>  		goto err_irq_free;
>  
> @@ -955,15 +961,17 @@ int dw_edma_probe(struct dw_edma_chip *chip)
>  	pm_runtime_enable(dev);
>  

>  	/* Turn debugfs on */
> -	dw_edma_v0_core_debugfs_on(chip);
> +	dw_edma_v0_core_debugfs_on(dw);
> +
> +	chip->dw = dw;

Thanks. This and the dw_edma_channel_setup() part are exactly what I
asked for in my series.

>  
>  	return 0;
>  
>  err_irq_free:

> -	for (i = (dw->nr_irqs - 1); i >= 0; i--)
> -		free_irq(dw->ops->irq_vector(dev, i), &dw->irq[i]);
> +	for (i = (chip->nr_irqs - 1); i >= 0; i--)
> +		free_irq(chip->ops->irq_vector(dev, i), &dw->irq[i]);
>  
> -	dw->nr_irqs = 0;
> +	chip->nr_irqs = 0;

No. Both changes don't seem right. First of all dw->nr_irqs is updated
in the dw_edma_irq_request() method and can differ from the value set in
chip->nr_irqs. So you need to use dw->nr_irqs in the loop here. Secondly
you either need to leave the dw->nr_irqs nullification here or
just drop it completely. chip->nr_irqs is initialized by the probe
method caller and shouldn't be changed in this context. Meanwhile the
dw->nr_irqs field can be updated in the dw_edma_irq_request() method
thus containing an actual number of the requested IRQs. Anyway seeing
the dw_edma storage won't be reused if the program counter gets to
this revert-on-error path, the nr_irqs nullification is redundant.

>  
>  	return err;
>  }
> @@ -980,8 +988,8 @@ int dw_edma_remove(struct dw_edma_chip *chip)
>  	dw_edma_v0_core_off(dw);
>  
>  	/* Free irqs */

> -	for (i = (dw->nr_irqs - 1); i >= 0; i--)
> -		free_irq(dw->ops->irq_vector(dev, i), &dw->irq[i]);
> +	for (i = (chip->nr_irqs - 1); i >= 0; i--)
> +		free_irq(chip->ops->irq_vector(dev, i), &dw->irq[i]);

Please use dw->nr_irqs here. Also see, you don't nullify
dw->nr_irqs/chip->nr_irqs here. So I don't see it's required to be
done in the probe method either.

-Sergey

>  
>  	/* Power management */
>  	pm_runtime_disable(dev);
> @@ -1002,7 +1010,7 @@ int dw_edma_remove(struct dw_edma_chip *chip)
>  	}
>  
>  	/* Turn debugfs off */
> -	dw_edma_v0_core_debugfs_off(chip);
> +	dw_edma_v0_core_debugfs_off(dw);
>  
>  	return 0;
>  }
> diff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-edma-core.h
> index 60316d408c3e0..85df2d511907b 100644
> --- a/drivers/dma/dw-edma/dw-edma-core.h
> +++ b/drivers/dma/dw-edma/dw-edma-core.h
> @@ -15,20 +15,12 @@
>  #include "../virt-dma.h"
>  
>  #define EDMA_LL_SZ					24
> -#define EDMA_MAX_WR_CH					8
> -#define EDMA_MAX_RD_CH					8
>  
>  enum dw_edma_dir {
>  	EDMA_DIR_WRITE = 0,
>  	EDMA_DIR_READ
>  };
>  
> -enum dw_edma_map_format {
> -	EDMA_MF_EDMA_LEGACY = 0x0,
> -	EDMA_MF_EDMA_UNROLL = 0x1,
> -	EDMA_MF_HDMA_COMPAT = 0x5
> -};
> -
>  enum dw_edma_request {
>  	EDMA_REQ_NONE = 0,
>  	EDMA_REQ_STOP,
> @@ -57,12 +49,6 @@ struct dw_edma_burst {
>  	u32				sz;
>  };
>  
> -struct dw_edma_region {
> -	phys_addr_t			paddr;
> -	void				__iomem *vaddr;
> -	size_t				sz;
> -};
> -
>  struct dw_edma_chunk {
>  	struct list_head		list;
>  	struct dw_edma_chan		*chan;
> @@ -87,7 +73,7 @@ struct dw_edma_desc {
>  
>  struct dw_edma_chan {
>  	struct virt_dma_chan		vc;
> -	struct dw_edma_chip		*chip;
> +	struct dw_edma			*dw;
>  	int				id;
>  	enum dw_edma_dir		dir;
>  
> @@ -109,10 +95,6 @@ struct dw_edma_irq {
>  	struct dw_edma			*dw;
>  };
>  
> -struct dw_edma_core_ops {
> -	int	(*irq_vector)(struct device *dev, unsigned int nr);
> -};
> -
>  struct dw_edma {
>  	char				name[20];
>  
> @@ -122,21 +104,14 @@ struct dw_edma {
>  	struct dma_device		rd_edma;
>  	u16				rd_ch_cnt;
>  
> -	struct dw_edma_region		rg_region;	/* Registers */
> -	struct dw_edma_region		ll_region_wr[EDMA_MAX_WR_CH];
> -	struct dw_edma_region		ll_region_rd[EDMA_MAX_RD_CH];
> -	struct dw_edma_region		dt_region_wr[EDMA_MAX_WR_CH];
> -	struct dw_edma_region		dt_region_rd[EDMA_MAX_RD_CH];
> -
>  	struct dw_edma_irq		*irq;
>  	int				nr_irqs;
>  
> -	enum dw_edma_map_format		mf;
> -
>  	struct dw_edma_chan		*chan;
> -	const struct dw_edma_core_ops	*ops;
>  
>  	raw_spinlock_t			lock;		/* Only for legacy */
> +
> +	struct dw_edma_chip             *chip;
>  #ifdef CONFIG_DEBUG_FS
>  	struct dentry			*debugfs;
>  #endif /* CONFIG_DEBUG_FS */
> diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
> index 44f6e09bdb531..21c8c59e09c23 100644
> --- a/drivers/dma/dw-edma/dw-edma-pcie.c
> +++ b/drivers/dma/dw-edma/dw-edma-pcie.c
> @@ -148,7 +148,6 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
>  	struct dw_edma_pcie_data vsec_data;
>  	struct device *dev = &pdev->dev;
>  	struct dw_edma_chip *chip;
> -	struct dw_edma *dw;
>  	int err, nr_irqs;
>  	int i, mask;
>  
> @@ -214,10 +213,6 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
>  	if (!chip)
>  		return -ENOMEM;
>  
> -	dw = devm_kzalloc(dev, sizeof(*dw), GFP_KERNEL);
> -	if (!dw)
> -		return -ENOMEM;
> -
>  	/* IRQs allocation */
>  	nr_irqs = pci_alloc_irq_vectors(pdev, 1, vsec_data.irqs,
>  					PCI_IRQ_MSI | PCI_IRQ_MSIX);
> @@ -228,29 +223,24 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
>  	}
>  
>  	/* Data structure initialization */
> -	chip->dw = dw;
>  	chip->dev = dev;
>  	chip->id = pdev->devfn;
>  	chip->irq = pdev->irq;
>  
> -	dw->mf = vsec_data.mf;
> -	dw->nr_irqs = nr_irqs;
> -	dw->ops = &dw_edma_pcie_core_ops;
> -	dw->wr_ch_cnt = vsec_data.wr_ch_cnt;
> -	dw->rd_ch_cnt = vsec_data.rd_ch_cnt;
> +	chip->mf = vsec_data.mf;
> +	chip->nr_irqs = nr_irqs;
> +	chip->ops = &dw_edma_pcie_core_ops;
>  
> -	dw->rg_region.vaddr = pcim_iomap_table(pdev)[vsec_data.rg.bar];
> -	if (!dw->rg_region.vaddr)
> -		return -ENOMEM;
> +	chip->wr_ch_cnt = vsec_data.wr_ch_cnt;
> +	chip->rd_ch_cnt = vsec_data.rd_ch_cnt;
>  
> -	dw->rg_region.vaddr += vsec_data.rg.off;
> -	dw->rg_region.paddr = pdev->resource[vsec_data.rg.bar].start;
> -	dw->rg_region.paddr += vsec_data.rg.off;
> -	dw->rg_region.sz = vsec_data.rg.sz;
> +	chip->rg_region.vaddr = pcim_iomap_table(pdev)[vsec_data.rg.bar];
> +	if (!chip->rg_region.vaddr)
> +		return -ENOMEM;
>  
> -	for (i = 0; i < dw->wr_ch_cnt; i++) {
> -		struct dw_edma_region *ll_region = &dw->ll_region_wr[i];
> -		struct dw_edma_region *dt_region = &dw->dt_region_wr[i];
> +	for (i = 0; i < chip->wr_ch_cnt; i++) {
> +		struct dw_edma_region *ll_region = &chip->ll_region_wr[i];
> +		struct dw_edma_region *dt_region = &chip->dt_region_wr[i];
>  		struct dw_edma_block *ll_block = &vsec_data.ll_wr[i];
>  		struct dw_edma_block *dt_block = &vsec_data.dt_wr[i];
>  
> @@ -273,9 +263,9 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
>  		dt_region->sz = dt_block->sz;
>  	}
>  
> -	for (i = 0; i < dw->rd_ch_cnt; i++) {
> -		struct dw_edma_region *ll_region = &dw->ll_region_rd[i];
> -		struct dw_edma_region *dt_region = &dw->dt_region_rd[i];
> +	for (i = 0; i < chip->rd_ch_cnt; i++) {
> +		struct dw_edma_region *ll_region = &chip->ll_region_rd[i];
> +		struct dw_edma_region *dt_region = &chip->dt_region_rd[i];
>  		struct dw_edma_block *ll_block = &vsec_data.ll_rd[i];
>  		struct dw_edma_block *dt_block = &vsec_data.dt_rd[i];
>  
> @@ -299,45 +289,45 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
>  	}
>  
>  	/* Debug info */
> -	if (dw->mf == EDMA_MF_EDMA_LEGACY)
> -		pci_dbg(pdev, "Version:\teDMA Port Logic (0x%x)\n", dw->mf);
> -	else if (dw->mf == EDMA_MF_EDMA_UNROLL)
> -		pci_dbg(pdev, "Version:\teDMA Unroll (0x%x)\n", dw->mf);
> -	else if (dw->mf == EDMA_MF_HDMA_COMPAT)
> -		pci_dbg(pdev, "Version:\tHDMA Compatible (0x%x)\n", dw->mf);
> +	if (chip->mf == EDMA_MF_EDMA_LEGACY)
> +		pci_dbg(pdev, "Version:\teDMA Port Logic (0x%x)\n", chip->mf);
> +	else if (chip->mf == EDMA_MF_EDMA_UNROLL)
> +		pci_dbg(pdev, "Version:\teDMA Unroll (0x%x)\n", chip->mf);
> +	else if (chip->mf == EDMA_MF_HDMA_COMPAT)
> +		pci_dbg(pdev, "Version:\tHDMA Compatible (0x%x)\n", chip->mf);
>  	else
> -		pci_dbg(pdev, "Version:\tUnknown (0x%x)\n", dw->mf);
> +		pci_dbg(pdev, "Version:\tUnknown (0x%x)\n", chip->mf);
>  
> -	pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
> +	pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p)\n",
>  		vsec_data.rg.bar, vsec_data.rg.off, vsec_data.rg.sz,
> -		dw->rg_region.vaddr, &dw->rg_region.paddr);
> +		chip->rg_region.vaddr);
>  
>  
> -	for (i = 0; i < dw->wr_ch_cnt; i++) {
> +	for (i = 0; i < chip->wr_ch_cnt; i++) {
>  		pci_dbg(pdev, "L. List:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
>  			i, vsec_data.ll_wr[i].bar,
> -			vsec_data.ll_wr[i].off, dw->ll_region_wr[i].sz,
> -			dw->ll_region_wr[i].vaddr, &dw->ll_region_wr[i].paddr);
> +			vsec_data.ll_wr[i].off, chip->ll_region_wr[i].sz,
> +			chip->ll_region_wr[i].vaddr, &chip->ll_region_wr[i].paddr);
>  
>  		pci_dbg(pdev, "Data:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
>  			i, vsec_data.dt_wr[i].bar,
> -			vsec_data.dt_wr[i].off, dw->dt_region_wr[i].sz,
> -			dw->dt_region_wr[i].vaddr, &dw->dt_region_wr[i].paddr);
> +			vsec_data.dt_wr[i].off, chip->dt_region_wr[i].sz,
> +			chip->dt_region_wr[i].vaddr, &chip->dt_region_wr[i].paddr);
>  	}
>  
> -	for (i = 0; i < dw->rd_ch_cnt; i++) {
> +	for (i = 0; i < chip->rd_ch_cnt; i++) {
>  		pci_dbg(pdev, "L. List:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
>  			i, vsec_data.ll_rd[i].bar,
> -			vsec_data.ll_rd[i].off, dw->ll_region_rd[i].sz,
> -			dw->ll_region_rd[i].vaddr, &dw->ll_region_rd[i].paddr);
> +			vsec_data.ll_rd[i].off, chip->ll_region_rd[i].sz,
> +			chip->ll_region_rd[i].vaddr, &chip->ll_region_rd[i].paddr);
>  
>  		pci_dbg(pdev, "Data:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
>  			i, vsec_data.dt_rd[i].bar,
> -			vsec_data.dt_rd[i].off, dw->dt_region_rd[i].sz,
> -			dw->dt_region_rd[i].vaddr, &dw->dt_region_rd[i].paddr);
> +			vsec_data.dt_rd[i].off, chip->dt_region_rd[i].sz,
> +			chip->dt_region_rd[i].vaddr, &chip->dt_region_rd[i].paddr);
>  	}
>  
> -	pci_dbg(pdev, "Nr. IRQs:\t%u\n", dw->nr_irqs);
> +	pci_dbg(pdev, "Nr. IRQs:\t%u\n", chip->nr_irqs);
>  
>  	/* Validating if PCI interrupts were enabled */
>  	if (!pci_dev_msi_enabled(pdev)) {
> @@ -345,10 +335,6 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
>  		return -EPERM;
>  	}
>  
> -	dw->irq = devm_kcalloc(dev, nr_irqs, sizeof(*dw->irq), GFP_KERNEL);
> -	if (!dw->irq)
> -		return -ENOMEM;
> -
>  	/* Starting eDMA driver */
>  	err = dw_edma_probe(chip);
>  	if (err) {
> diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c
> index 329fc2e57b703..082049d53ca73 100644
> --- a/drivers/dma/dw-edma/dw-edma-v0-core.c
> +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c
> @@ -25,7 +25,7 @@ enum dw_edma_control {
>  
>  static inline struct dw_edma_v0_regs __iomem *__dw_regs(struct dw_edma *dw)
>  {
> -	return dw->rg_region.vaddr;
> +	return dw->chip->rg_region.vaddr;
>  }
>  
>  #define SET_32(dw, name, value)				\
> @@ -96,7 +96,7 @@ static inline struct dw_edma_v0_regs __iomem *__dw_regs(struct dw_edma *dw)
>  static inline struct dw_edma_v0_ch_regs __iomem *
>  __dw_ch_regs(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch)
>  {
> -	if (dw->mf == EDMA_MF_EDMA_LEGACY)
> +	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY)
>  		return &(__dw_regs(dw)->type.legacy.ch);
>  
>  	if (dir == EDMA_DIR_WRITE)
> @@ -108,7 +108,7 @@ __dw_ch_regs(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch)
>  static inline void writel_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
>  			     u32 value, void __iomem *addr)
>  {
> -	if (dw->mf == EDMA_MF_EDMA_LEGACY) {
> +	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) {
>  		u32 viewport_sel;
>  		unsigned long flags;
>  
> @@ -133,7 +133,7 @@ static inline u32 readl_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
>  {
>  	u32 value;
>  
> -	if (dw->mf == EDMA_MF_EDMA_LEGACY) {
> +	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) {
>  		u32 viewport_sel;
>  		unsigned long flags;
>  
> @@ -169,7 +169,7 @@ static inline u32 readl_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
>  static inline void writeq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
>  			     u64 value, void __iomem *addr)
>  {
> -	if (dw->mf == EDMA_MF_EDMA_LEGACY) {
> +	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) {
>  		u32 viewport_sel;
>  		unsigned long flags;
>  
> @@ -194,7 +194,7 @@ static inline u64 readq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
>  {
>  	u32 value;
>  
> -	if (dw->mf == EDMA_MF_EDMA_LEGACY) {
> +	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) {
>  		u32 viewport_sel;
>  		unsigned long flags;
>  
> @@ -256,7 +256,7 @@ u16 dw_edma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
>  
>  enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
>  {
> -	struct dw_edma *dw = chan->chip->dw;
> +	struct dw_edma *dw = chan->dw;
>  	u32 tmp;
>  
>  	tmp = FIELD_GET(EDMA_V0_CH_STATUS_MASK,
> @@ -272,7 +272,7 @@ enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
>  
>  void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
>  {
> -	struct dw_edma *dw = chan->chip->dw;
> +	struct dw_edma *dw = chan->dw;
>  
>  	SET_RW_32(dw, chan->dir, int_clear,
>  		  FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id)));
> @@ -280,7 +280,7 @@ void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
>  
>  void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
>  {
> -	struct dw_edma *dw = chan->chip->dw;
> +	struct dw_edma *dw = chan->dw;
>  
>  	SET_RW_32(dw, chan->dir, int_clear,
>  		  FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id)));
> @@ -357,7 +357,7 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
>  void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
>  {
>  	struct dw_edma_chan *chan = chunk->chan;
> -	struct dw_edma *dw = chan->chip->dw;
> +	struct dw_edma *dw = chan->dw;
>  	u32 tmp;
>  
>  	dw_edma_v0_core_write_chunk(chunk);
> @@ -365,7 +365,7 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
>  	if (first) {
>  		/* Enable engine */
>  		SET_RW_32(dw, chan->dir, engine_en, BIT(0));
> -		if (dw->mf == EDMA_MF_HDMA_COMPAT) {
> +		if (dw->chip->mf == EDMA_MF_HDMA_COMPAT) {
>  			switch (chan->id) {
>  			case 0:
>  				SET_RW_COMPAT(dw, chan->dir, ch0_pwr_en,
> @@ -431,7 +431,7 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
>  
>  int dw_edma_v0_core_device_config(struct dw_edma_chan *chan)
>  {
> -	struct dw_edma *dw = chan->chip->dw;
> +	struct dw_edma *dw = chan->dw;
>  	u32 tmp = 0;
>  
>  	/* MSI done addr - low, high */
> @@ -501,12 +501,12 @@ int dw_edma_v0_core_device_config(struct dw_edma_chan *chan)
>  }
>  
>  /* eDMA debugfs callbacks */
> -void dw_edma_v0_core_debugfs_on(struct dw_edma_chip *chip)
> +void dw_edma_v0_core_debugfs_on(struct dw_edma *dw)
>  {
> -	dw_edma_v0_debugfs_on(chip);
> +	dw_edma_v0_debugfs_on(dw->chip);
>  }
>  
> -void dw_edma_v0_core_debugfs_off(struct dw_edma_chip *chip)
> +void dw_edma_v0_core_debugfs_off(struct dw_edma *dw)
>  {
> -	dw_edma_v0_debugfs_off(chip);
> +	dw_edma_v0_debugfs_off(dw->chip);
>  }
> diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.h b/drivers/dma/dw-edma/dw-edma-v0-core.h
> index 2afa626b8300c..75aec6d31b210 100644
> --- a/drivers/dma/dw-edma/dw-edma-v0-core.h
> +++ b/drivers/dma/dw-edma/dw-edma-v0-core.h
> @@ -22,7 +22,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma *chan, enum dw_edma_dir dir)
>  void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first);
>  int dw_edma_v0_core_device_config(struct dw_edma_chan *chan);
>  /* eDMA debug fs callbacks */
> -void dw_edma_v0_core_debugfs_on(struct dw_edma_chip *chip);
> -void dw_edma_v0_core_debugfs_off(struct dw_edma_chip *chip);
> +void dw_edma_v0_core_debugfs_on(struct dw_edma *dw);
> +void dw_edma_v0_core_debugfs_off(struct dw_edma *dw);
>  
>  #endif /* _DW_EDMA_V0_CORE_H */
> diff --git a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
> index 4b3bcffd15ef1..edb7e137cb35a 100644
> --- a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
> +++ b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
> @@ -54,7 +54,7 @@ struct debugfs_entries {
>  static int dw_edma_debugfs_u32_get(void *data, u64 *val)
>  {
>  	void __iomem *reg = (void __force __iomem *)data;
> -	if (dw->mf == EDMA_MF_EDMA_LEGACY &&
> +	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY &&
>  	    reg >= (void __iomem *)&regs->type.legacy.ch) {
>  		void __iomem *ptr = &regs->type.legacy.ch;
>  		u32 viewport_sel = 0;
> @@ -173,7 +173,7 @@ static void dw_edma_debugfs_regs_wr(struct dentry *dir)
>  	nr_entries = ARRAY_SIZE(debugfs_regs);
>  	dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
>  
> -	if (dw->mf == EDMA_MF_HDMA_COMPAT) {
> +	if (dw->chip->mf == EDMA_MF_HDMA_COMPAT) {
>  		nr_entries = ARRAY_SIZE(debugfs_unroll_regs);
>  		dw_edma_debugfs_create_x32(debugfs_unroll_regs, nr_entries,
>  					   regs_dir);
> @@ -242,7 +242,7 @@ static void dw_edma_debugfs_regs_rd(struct dentry *dir)
>  	nr_entries = ARRAY_SIZE(debugfs_regs);
>  	dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
>  
> -	if (dw->mf == EDMA_MF_HDMA_COMPAT) {
> +	if (dw->chip->mf == EDMA_MF_HDMA_COMPAT) {
>  		nr_entries = ARRAY_SIZE(debugfs_unroll_regs);
>  		dw_edma_debugfs_create_x32(debugfs_unroll_regs, nr_entries,
>  					   regs_dir);
> @@ -288,7 +288,7 @@ void dw_edma_v0_debugfs_on(struct dw_edma_chip *chip)
>  	if (!dw)
>  		return;
>  
> -	regs = dw->rg_region.vaddr;
> +	regs = dw->chip->rg_region.vaddr;
>  	if (!regs)
>  		return;
>  
> @@ -296,7 +296,7 @@ void dw_edma_v0_debugfs_on(struct dw_edma_chip *chip)
>  	if (!dw->debugfs)
>  		return;
>  
> -	debugfs_create_u32("mf", 0444, dw->debugfs, &dw->mf);
> +	debugfs_create_u32("mf", 0444, dw->debugfs, &dw->chip->mf);
>  	debugfs_create_u16("wr_ch_cnt", 0444, dw->debugfs, &dw->wr_ch_cnt);
>  	debugfs_create_u16("rd_ch_cnt", 0444, dw->debugfs, &dw->rd_ch_cnt);
>  
> diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
> index cab6e18773dad..a9bee4aeb2eee 100644
> --- a/include/linux/dma/edma.h
> +++ b/include/linux/dma/edma.h
> @@ -12,19 +12,63 @@
>  #include <linux/device.h>
>  #include <linux/dmaengine.h>
>  
> +#define EDMA_MAX_WR_CH                                  8
> +#define EDMA_MAX_RD_CH                                  8
> +
>  struct dw_edma;
>  
> +struct dw_edma_region {
> +	phys_addr_t	paddr;
> +	void __iomem	*vaddr;
> +	size_t		sz;
> +};
> +
> +struct dw_edma_core_ops {
> +	int (*irq_vector)(struct device *dev, unsigned int nr);
> +};
> +
> +enum dw_edma_map_format {
> +	EDMA_MF_EDMA_LEGACY = 0x0,
> +	EDMA_MF_EDMA_UNROLL = 0x1,
> +	EDMA_MF_HDMA_COMPAT = 0x5
> +};
> +
>  /**
>   * struct dw_edma_chip - representation of DesignWare eDMA controller hardware
>   * @dev:		 struct device of the eDMA controller
>   * @id:			 instance ID
>   * @irq:		 irq line
> + * @nr_irqs:		 total dma irq number
> + * @ops			 DMA channel to IRQ number mapping
> + * @wr_ch_cnt		 DMA write channel number
> + * @rd_ch_cnt		 DMA read channel number
> + * @rg_region		 DMA register region
> + * @ll_region_wr	 DMA descriptor link list memory for write channel
> + * @ll_region_rd	 DMA descriptor link list memory for read channel
> + * @mf			 DMA register map format
>   * @dw:			 struct dw_edma that is filed by dw_edma_probe()
>   */
>  struct dw_edma_chip {
>  	struct device		*dev;
>  	int			id;
>  	int			irq;
> +	int			nr_irqs;
> +	const struct dw_edma_core_ops   *ops;
> +
> +	struct dw_edma_region	rg_region;
> +
> +	u16			wr_ch_cnt;
> +	u16			rd_ch_cnt;
> +	/* link list address */
> +	struct dw_edma_region	ll_region_wr[EDMA_MAX_WR_CH];
> +	struct dw_edma_region	ll_region_rd[EDMA_MAX_RD_CH];
> +
> +	/* data region */
> +	struct dw_edma_region	dt_region_wr[EDMA_MAX_WR_CH];
> +	struct dw_edma_region	dt_region_rd[EDMA_MAX_RD_CH];
> +
> +	enum dw_edma_map_format	mf;
> +
>  	struct dw_edma		*dw;
>  };
>  
> -- 
> 2.35.1
>