| Message ID | 20220307224750.18055-5-Frank.Li@nxp.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v3,1/6] dmaengine: dw-edma: fix dw_edma_probe() can't be call globally | expand |
On Mon, Mar 07, 2022 at 04:47:49PM -0600, Frank Li wrote: > Allow PCI EP probe DMA locally and prevent use of remote MSI > to remote PCI host. > > Add option to force 32bit DBI register access even on > 64-bit systems. i.MX8 hardware only allowed 32bit register > access. > > Signed-off-by: Frank Li <Frank.Li@nxp.com> > --- > > Resend added dmaengine@vger.kernel.org > > Change from v2 to v3 > - rework commit message > - Change to DW_EDMA_CHIP_32BIT_DBI > - using DW_EDMA_CHIP_LOCAL control msi > - Apply Bjorn's comments, > if (!j) { > control |= DW_EDMA_V0_LIE; > if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > control |= DW_EDMA_V0_RIE; > } > > if ((chan->chip->flags & DW_EDMA_CHIP_REG32BIT) || > !IS_ENABLED(CONFIG_64BIT)) { > SET_CH_32(...); > SET_CH_32(...); > } else { > SET_CH_64(...); > } > > > Change from v1 to v2 > - none > > drivers/dma/dw-edma/dw-edma-v0-core.c | 20 ++++++++++++-------- > include/linux/dma/edma.h | 9 +++++++++ > 2 files changed, 21 insertions(+), 8 deletions(-) > > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c > index 6e2f83e31a03a..081cd7997348d 100644 > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c > @@ -307,6 +307,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma_chip *chip, enum dw_edma_dir > static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > { > struct dw_edma_burst *child; > + struct dw_edma_chan *chan = chunk->chan; > struct dw_edma_v0_lli __iomem *lli; > struct dw_edma_v0_llp __iomem *llp; > u32 control = 0, i = 0; > @@ -320,9 +321,11 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > j = chunk->bursts_alloc; > list_for_each_entry(child, &chunk->burst->list, list) { > j--; > - if (!j) > - control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE); > - > + if (!j) { > + control |= DW_EDMA_V0_LIE; > + if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > + control |= DW_EDMA_V0_RIE; > + } > /* Channel control */ > SET_LL_32(&lli[i].control, control); > /* Transfer size */ > @@ -420,15 +423,16 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) > SET_CH_32(chip, chan->dir, chan->id, ch_control1, > (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE)); > /* Linked list */ > - #ifdef CONFIG_64BIT > - SET_CH_64(chip, chan->dir, chan->id, llp.reg, > - chunk->ll_region.paddr); > - #else /* CONFIG_64BIT */ > + if ((chan->chip->flags & DW_EDMA_CHIP_32BIT_DBI) || > + !IS_ENABLED(CONFIG_64BIT)) { > SET_CH_32(chip, chan->dir, chan->id, llp.lsb, > lower_32_bits(chunk->ll_region.paddr)); > SET_CH_32(chip, chan->dir, chan->id, llp.msb, > upper_32_bits(chunk->ll_region.paddr)); > - #endif /* CONFIG_64BIT */ > + } else { > + SET_CH_64(chip, chan->dir, chan->id, llp.reg, > + chunk->ll_region.paddr); > + } > } > /* Doorbell */ > SET_RW_32(chip, chan->dir, doorbell, > diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h > index fcfbc0f47f83d..4321f6378ef66 100644 > --- a/include/linux/dma/edma.h > +++ b/include/linux/dma/edma.h > @@ -33,6 +33,12 @@ enum dw_edma_map_format { > EDMA_MF_HDMA_COMPAT = 0x5 > }; > > +/* Probe EDMA engine locally and prevent generate MSI to host side*/ > +#define DW_EDMA_CHIP_LOCAL BIT(0) > + > +/* Only support 32bit DBI register access */ > +#define DW_EDMA_CHIP_32BIT_DBI BIT(1) > + How about using an enum for defining the flags? This would help us organize the flags in a more coherent way and also will give the benefit of kdoc. /** * enum dw_edma_chip_flags - Flags specific to an eDMA chip * @DW_EDMA_CHIP_LOCAL: eDMA is used locally by an endpoint * @DW_EDMA_CHIP_32BIT_DBI: eDMA only supports 32bit DBI access */ enum dw_edma_chip_flags { DW_EDMA_CHIP_LOCAL = BIT(0), DW_EDMA_CHIP_32BIT_DBI = BIT(1), }; > /** > * struct dw_edma_chip - representation of DesignWare eDMA controller hardware > * @dev: struct device of the eDMA controller > @@ -40,6 +46,8 @@ enum dw_edma_map_format { > * @nr_irqs: total dma irq number > * reg64bit if support 64bit write to register > * @ops DMA channel to IRQ number mapping > + * @flags - DW_EDMA_CHIP_LOCAL > + * - DW_EDMA_CHIP_32BIT_DBI No need to mention the flags here if you use the enum I suggested above. > * @wr_ch_cnt DMA write channel number > * @rd_ch_cnt DMA read channel number > * @rg_region DMA register region > @@ -53,6 +61,7 @@ struct dw_edma_chip { > int id; > int nr_irqs; > const struct dw_edma_core_ops *ops; > + u32 flags; enum dw_edma_chip_flags flags; Thanks, Mani > > void __iomem *reg_base; > > -- > 2.24.0.rc1 >
Subject could be: dmaengine: dw-edma: Add support for chip specific flags On Mon, Mar 07, 2022 at 04:47:49PM -0600, Frank Li wrote: > Allow PCI EP probe DMA locally and prevent use of remote MSI > to remote PCI host. > > Add option to force 32bit DBI register access even on > 64-bit systems. i.MX8 hardware only allowed 32bit register > access. > Add a "flags" field to the "struct dw_edma_chip" so that the controller drivers can pass flags that are relevant to the platform. Currently 2 flags are defined: 1. DW_EDMA_CHIP_LOCAL - Used by the controller drivers accessing eDMA locally. Local eDMA access doesn't require generating MSIs to the remote. 2. DW_EDMA_CHIP_32BIT_DBI - Used by the controller drivers like i.MX8 that allows only 32bit access to the DBI region. Thanks, Mani > Signed-off-by: Frank Li <Frank.Li@nxp.com> > --- > > Resend added dmaengine@vger.kernel.org > > Change from v2 to v3 > - rework commit message > - Change to DW_EDMA_CHIP_32BIT_DBI > - using DW_EDMA_CHIP_LOCAL control msi > - Apply Bjorn's comments, > if (!j) { > control |= DW_EDMA_V0_LIE; > if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > control |= DW_EDMA_V0_RIE; > } > > if ((chan->chip->flags & DW_EDMA_CHIP_REG32BIT) || > !IS_ENABLED(CONFIG_64BIT)) { > SET_CH_32(...); > SET_CH_32(...); > } else { > SET_CH_64(...); > } > > > Change from v1 to v2 > - none > > drivers/dma/dw-edma/dw-edma-v0-core.c | 20 ++++++++++++-------- > include/linux/dma/edma.h | 9 +++++++++ > 2 files changed, 21 insertions(+), 8 deletions(-) > > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c > index 6e2f83e31a03a..081cd7997348d 100644 > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c > @@ -307,6 +307,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma_chip *chip, enum dw_edma_dir > static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > { > struct dw_edma_burst *child; > + struct dw_edma_chan *chan = chunk->chan; > struct dw_edma_v0_lli __iomem *lli; > struct dw_edma_v0_llp __iomem *llp; > u32 control = 0, i = 0; > @@ -320,9 +321,11 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > j = chunk->bursts_alloc; > list_for_each_entry(child, &chunk->burst->list, list) { > j--; > - if (!j) > - control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE); > - > + if (!j) { > + control |= DW_EDMA_V0_LIE; > + if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > + control |= DW_EDMA_V0_RIE; > + } > /* Channel control */ > SET_LL_32(&lli[i].control, control); > /* Transfer size */ > @@ -420,15 +423,16 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) > SET_CH_32(chip, chan->dir, chan->id, ch_control1, > (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE)); > /* Linked list */ > - #ifdef CONFIG_64BIT > - SET_CH_64(chip, chan->dir, chan->id, llp.reg, > - chunk->ll_region.paddr); > - #else /* CONFIG_64BIT */ > + if ((chan->chip->flags & DW_EDMA_CHIP_32BIT_DBI) || > + !IS_ENABLED(CONFIG_64BIT)) { > SET_CH_32(chip, chan->dir, chan->id, llp.lsb, > lower_32_bits(chunk->ll_region.paddr)); > SET_CH_32(chip, chan->dir, chan->id, llp.msb, > upper_32_bits(chunk->ll_region.paddr)); > - #endif /* CONFIG_64BIT */ > + } else { > + SET_CH_64(chip, chan->dir, chan->id, llp.reg, > + chunk->ll_region.paddr); > + } > } > /* Doorbell */ > SET_RW_32(chip, chan->dir, doorbell, > diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h > index fcfbc0f47f83d..4321f6378ef66 100644 > --- a/include/linux/dma/edma.h > +++ b/include/linux/dma/edma.h > @@ -33,6 +33,12 @@ enum dw_edma_map_format { > EDMA_MF_HDMA_COMPAT = 0x5 > }; > > +/* Probe EDMA engine locally and prevent generate MSI to host side*/ > +#define DW_EDMA_CHIP_LOCAL BIT(0) > + > +/* Only support 32bit DBI register access */ > +#define DW_EDMA_CHIP_32BIT_DBI BIT(1) > + > /** > * struct dw_edma_chip - representation of DesignWare eDMA controller hardware > * @dev: struct device of the eDMA controller > @@ -40,6 +46,8 @@ enum dw_edma_map_format { > * @nr_irqs: total dma irq number > * reg64bit if support 64bit write to register > * @ops DMA channel to IRQ number mapping > + * @flags - DW_EDMA_CHIP_LOCAL > + * - DW_EDMA_CHIP_32BIT_DBI > * @wr_ch_cnt DMA write channel number > * @rd_ch_cnt DMA read channel number > * @rg_region DMA register region > @@ -53,6 +61,7 @@ struct dw_edma_chip { > int id; > int nr_irqs; > const struct dw_edma_core_ops *ops; > + u32 flags; > > void __iomem *reg_base; > > -- > 2.24.0.rc1 >
On Thu, Mar 10, 2022 at 1:44 AM Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> wrote: > > On Mon, Mar 07, 2022 at 04:47:49PM -0600, Frank Li wrote: > > Allow PCI EP probe DMA locally and prevent use of remote MSI > > to remote PCI host. > > > > Add option to force 32bit DBI register access even on > > 64-bit systems. i.MX8 hardware only allowed 32bit register > > access. > > > > Signed-off-by: Frank Li <Frank.Li@nxp.com> > > --- > > > > Resend added dmaengine@vger.kernel.org > > > > Change from v2 to v3 > > - rework commit message > > - Change to DW_EDMA_CHIP_32BIT_DBI > > - using DW_EDMA_CHIP_LOCAL control msi > > - Apply Bjorn's comments, > > if (!j) { > > control |= DW_EDMA_V0_LIE; > > if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > > control |= DW_EDMA_V0_RIE; > > } > > > > if ((chan->chip->flags & DW_EDMA_CHIP_REG32BIT) || > > !IS_ENABLED(CONFIG_64BIT)) { > > SET_CH_32(...); > > SET_CH_32(...); > > } else { > > SET_CH_64(...); > > } > > > > > > Change from v1 to v2 > > - none > > > > drivers/dma/dw-edma/dw-edma-v0-core.c | 20 ++++++++++++-------- > > include/linux/dma/edma.h | 9 +++++++++ > > 2 files changed, 21 insertions(+), 8 deletions(-) > > > > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c > > index 6e2f83e31a03a..081cd7997348d 100644 > > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c > > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c > > @@ -307,6 +307,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma_chip *chip, enum dw_edma_dir > > static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > > { > > struct dw_edma_burst *child; > > + struct dw_edma_chan *chan = chunk->chan; > > struct dw_edma_v0_lli __iomem *lli; > > struct dw_edma_v0_llp __iomem *llp; > > u32 control = 0, i = 0; > > @@ -320,9 +321,11 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > > j = chunk->bursts_alloc; > > list_for_each_entry(child, &chunk->burst->list, list) { > > j--; > > - if (!j) > > - control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE); > > - > > + if (!j) { > > + control |= DW_EDMA_V0_LIE; > > + if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > > + control |= DW_EDMA_V0_RIE; > > + } > > /* Channel control */ > > SET_LL_32(&lli[i].control, control); > > /* Transfer size */ > > @@ -420,15 +423,16 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) > > SET_CH_32(chip, chan->dir, chan->id, ch_control1, > > (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE)); > > /* Linked list */ > > - #ifdef CONFIG_64BIT > > - SET_CH_64(chip, chan->dir, chan->id, llp.reg, > > - chunk->ll_region.paddr); > > - #else /* CONFIG_64BIT */ > > + if ((chan->chip->flags & DW_EDMA_CHIP_32BIT_DBI) || > > + !IS_ENABLED(CONFIG_64BIT)) { > > SET_CH_32(chip, chan->dir, chan->id, llp.lsb, > > lower_32_bits(chunk->ll_region.paddr)); > > SET_CH_32(chip, chan->dir, chan->id, llp.msb, > > upper_32_bits(chunk->ll_region.paddr)); > > - #endif /* CONFIG_64BIT */ > > + } else { > > + SET_CH_64(chip, chan->dir, chan->id, llp.reg, > > + chunk->ll_region.paddr); > > + } > > } > > /* Doorbell */ > > SET_RW_32(chip, chan->dir, doorbell, > > diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h > > index fcfbc0f47f83d..4321f6378ef66 100644 > > --- a/include/linux/dma/edma.h > > +++ b/include/linux/dma/edma.h > > @@ -33,6 +33,12 @@ enum dw_edma_map_format { > > EDMA_MF_HDMA_COMPAT = 0x5 > > }; > > > > +/* Probe EDMA engine locally and prevent generate MSI to host side*/ > > +#define DW_EDMA_CHIP_LOCAL BIT(0) > > + > > +/* Only support 32bit DBI register access */ > > +#define DW_EDMA_CHIP_32BIT_DBI BIT(1) > > + > > How about using an enum for defining the flags? This would help us organize the > flags in a more coherent way and also will give the benefit of kdoc. Did you see other linux code use enum as bitmask? According to my understanding, enum just chooses values in a list. > > /** > * enum dw_edma_chip_flags - Flags specific to an eDMA chip > * @DW_EDMA_CHIP_LOCAL: eDMA is used locally by an endpoint > * @DW_EDMA_CHIP_32BIT_DBI: eDMA only supports 32bit DBI access > */ > enum dw_edma_chip_flags { > DW_EDMA_CHIP_LOCAL = BIT(0), > DW_EDMA_CHIP_32BIT_DBI = BIT(1), > }; > > > /** > > * struct dw_edma_chip - representation of DesignWare eDMA controller hardware > > * @dev: struct device of the eDMA controller > > @@ -40,6 +46,8 @@ enum dw_edma_map_format { > > * @nr_irqs: total dma irq number > > * reg64bit if support 64bit write to register > > * @ops DMA channel to IRQ number mapping > > + * @flags - DW_EDMA_CHIP_LOCAL > > + * - DW_EDMA_CHIP_32BIT_DBI > > No need to mention the flags here if you use the enum I suggested above. > > > * @wr_ch_cnt DMA write channel number > > * @rd_ch_cnt DMA read channel number > > * @rg_region DMA register region > > @@ -53,6 +61,7 @@ struct dw_edma_chip { > > int id; > > int nr_irqs; > > const struct dw_edma_core_ops *ops; > > + u32 flags; > > enum dw_edma_chip_flags flags; > > Thanks, > Mani > > > > > void __iomem *reg_base; > > > > -- > > 2.24.0.rc1 > >
On Thu, Mar 10, 2022 at 11:00 AM Zhi Li <lznuaa@gmail.com> wrote: > > On Thu, Mar 10, 2022 at 1:44 AM Manivannan Sadhasivam > <manivannan.sadhasivam@linaro.org> wrote: > > > > On Mon, Mar 07, 2022 at 04:47:49PM -0600, Frank Li wrote: > > > Allow PCI EP probe DMA locally and prevent use of remote MSI > > > to remote PCI host. > > > > > > Add option to force 32bit DBI register access even on > > > 64-bit systems. i.MX8 hardware only allowed 32bit register > > > access. > > > > > > Signed-off-by: Frank Li <Frank.Li@nxp.com> > > > --- > > > > > > Resend added dmaengine@vger.kernel.org > > > > > > Change from v2 to v3 > > > - rework commit message > > > - Change to DW_EDMA_CHIP_32BIT_DBI > > > - using DW_EDMA_CHIP_LOCAL control msi > > > - Apply Bjorn's comments, > > > if (!j) { > > > control |= DW_EDMA_V0_LIE; > > > if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > > > control |= DW_EDMA_V0_RIE; > > > } > > > > > > if ((chan->chip->flags & DW_EDMA_CHIP_REG32BIT) || > > > !IS_ENABLED(CONFIG_64BIT)) { > > > SET_CH_32(...); > > > SET_CH_32(...); > > > } else { > > > SET_CH_64(...); > > > } > > > > > > > > > Change from v1 to v2 > > > - none > > > > > > drivers/dma/dw-edma/dw-edma-v0-core.c | 20 ++++++++++++-------- > > > include/linux/dma/edma.h | 9 +++++++++ > > > 2 files changed, 21 insertions(+), 8 deletions(-) > > > > > > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c > > > index 6e2f83e31a03a..081cd7997348d 100644 > > > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c > > > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c > > > @@ -307,6 +307,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma_chip *chip, enum dw_edma_dir > > > static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > > > { > > > struct dw_edma_burst *child; > > > + struct dw_edma_chan *chan = chunk->chan; > > > struct dw_edma_v0_lli __iomem *lli; > > > struct dw_edma_v0_llp __iomem *llp; > > > u32 control = 0, i = 0; > > > @@ -320,9 +321,11 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > > > j = chunk->bursts_alloc; > > > list_for_each_entry(child, &chunk->burst->list, list) { > > > j--; > > > - if (!j) > > > - control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE); > > > - > > > + if (!j) { > > > + control |= DW_EDMA_V0_LIE; > > > + if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > > > + control |= DW_EDMA_V0_RIE; > > > + } > > > /* Channel control */ > > > SET_LL_32(&lli[i].control, control); > > > /* Transfer size */ > > > @@ -420,15 +423,16 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) > > > SET_CH_32(chip, chan->dir, chan->id, ch_control1, > > > (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE)); > > > /* Linked list */ > > > - #ifdef CONFIG_64BIT > > > - SET_CH_64(chip, chan->dir, chan->id, llp.reg, > > > - chunk->ll_region.paddr); > > > - #else /* CONFIG_64BIT */ > > > + if ((chan->chip->flags & DW_EDMA_CHIP_32BIT_DBI) || > > > + !IS_ENABLED(CONFIG_64BIT)) { > > > SET_CH_32(chip, chan->dir, chan->id, llp.lsb, > > > lower_32_bits(chunk->ll_region.paddr)); > > > SET_CH_32(chip, chan->dir, chan->id, llp.msb, > > > upper_32_bits(chunk->ll_region.paddr)); > > > - #endif /* CONFIG_64BIT */ > > > + } else { > > > + SET_CH_64(chip, chan->dir, chan->id, llp.reg, > > > + chunk->ll_region.paddr); > > > + } > > > } > > > /* Doorbell */ > > > SET_RW_32(chip, chan->dir, doorbell, > > > diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h > > > index fcfbc0f47f83d..4321f6378ef66 100644 > > > --- a/include/linux/dma/edma.h > > > +++ b/include/linux/dma/edma.h > > > @@ -33,6 +33,12 @@ enum dw_edma_map_format { > > > EDMA_MF_HDMA_COMPAT = 0x5 > > > }; > > > > > > +/* Probe EDMA engine locally and prevent generate MSI to host side*/ > > > +#define DW_EDMA_CHIP_LOCAL BIT(0) > > > + > > > +/* Only support 32bit DBI register access */ > > > +#define DW_EDMA_CHIP_32BIT_DBI BIT(1) > > > + > > > > How about using an enum for defining the flags? This would help us organize the > > flags in a more coherent way and also will give the benefit of kdoc. > > Did you see other linux code use enum as bitmask? > According to my understanding, enum just chooses values in a list. Do you agree that using define because it will be used as bitmask? best regards Frank Li > > > > > /** > > * enum dw_edma_chip_flags - Flags specific to an eDMA chip > > * @DW_EDMA_CHIP_LOCAL: eDMA is used locally by an endpoint > > * @DW_EDMA_CHIP_32BIT_DBI: eDMA only supports 32bit DBI access > > */ > > enum dw_edma_chip_flags { > > DW_EDMA_CHIP_LOCAL = BIT(0), > > DW_EDMA_CHIP_32BIT_DBI = BIT(1), > > }; > > > > > /** > > > * struct dw_edma_chip - representation of DesignWare eDMA controller hardware > > > * @dev: struct device of the eDMA controller > > > @@ -40,6 +46,8 @@ enum dw_edma_map_format { > > > * @nr_irqs: total dma irq number > > > * reg64bit if support 64bit write to register > > > * @ops DMA channel to IRQ number mapping > > > + * @flags - DW_EDMA_CHIP_LOCAL > > > + * - DW_EDMA_CHIP_32BIT_DBI > > > > No need to mention the flags here if you use the enum I suggested above. > > > > > * @wr_ch_cnt DMA write channel number > > > * @rd_ch_cnt DMA read channel number > > > * @rg_region DMA register region > > > @@ -53,6 +61,7 @@ struct dw_edma_chip { > > > int id; > > > int nr_irqs; > > > const struct dw_edma_core_ops *ops; > > > + u32 flags; > > > > enum dw_edma_chip_flags flags; > > > > Thanks, > > Mani > > > > > > > > void __iomem *reg_base; > > > > > > -- > > > 2.24.0.rc1 > > >
On Fri, Mar 18, 2022 at 01:40:44PM -0500, Zhi Li wrote: > On Thu, Mar 10, 2022 at 11:00 AM Zhi Li <lznuaa@gmail.com> wrote: > > > > On Thu, Mar 10, 2022 at 1:44 AM Manivannan Sadhasivam > > <manivannan.sadhasivam@linaro.org> wrote: > > > > > > On Mon, Mar 07, 2022 at 04:47:49PM -0600, Frank Li wrote: > > > > Allow PCI EP probe DMA locally and prevent use of remote MSI > > > > to remote PCI host. > > > > > > > > Add option to force 32bit DBI register access even on > > > > 64-bit systems. i.MX8 hardware only allowed 32bit register > > > > access. > > > > > > > > Signed-off-by: Frank Li <Frank.Li@nxp.com> > > > > --- > > > > > > > > Resend added dmaengine@vger.kernel.org > > > > > > > > Change from v2 to v3 > > > > - rework commit message > > > > - Change to DW_EDMA_CHIP_32BIT_DBI > > > > - using DW_EDMA_CHIP_LOCAL control msi > > > > - Apply Bjorn's comments, > > > > if (!j) { > > > > control |= DW_EDMA_V0_LIE; > > > > if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > > > > control |= DW_EDMA_V0_RIE; > > > > } > > > > > > > > if ((chan->chip->flags & DW_EDMA_CHIP_REG32BIT) || > > > > !IS_ENABLED(CONFIG_64BIT)) { > > > > SET_CH_32(...); > > > > SET_CH_32(...); > > > > } else { > > > > SET_CH_64(...); > > > > } > > > > > > > > > > > > Change from v1 to v2 > > > > - none > > > > > > > > drivers/dma/dw-edma/dw-edma-v0-core.c | 20 ++++++++++++-------- > > > > include/linux/dma/edma.h | 9 +++++++++ > > > > 2 files changed, 21 insertions(+), 8 deletions(-) > > > > > > > > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c > > > > index 6e2f83e31a03a..081cd7997348d 100644 > > > > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c > > > > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c > > > > @@ -307,6 +307,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma_chip *chip, enum dw_edma_dir > > > > static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > > > > { > > > > struct dw_edma_burst *child; > > > > + struct dw_edma_chan *chan = chunk->chan; > > > > struct dw_edma_v0_lli __iomem *lli; > > > > struct dw_edma_v0_llp __iomem *llp; > > > > u32 control = 0, i = 0; > > > > @@ -320,9 +321,11 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) > > > > j = chunk->bursts_alloc; > > > > list_for_each_entry(child, &chunk->burst->list, list) { > > > > j--; > > > > - if (!j) > > > > - control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE); > > > > - > > > > + if (!j) { > > > > + control |= DW_EDMA_V0_LIE; > > > > + if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) > > > > + control |= DW_EDMA_V0_RIE; > > > > + } > > > > /* Channel control */ > > > > SET_LL_32(&lli[i].control, control); > > > > /* Transfer size */ > > > > @@ -420,15 +423,16 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) > > > > SET_CH_32(chip, chan->dir, chan->id, ch_control1, > > > > (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE)); > > > > /* Linked list */ > > > > - #ifdef CONFIG_64BIT > > > > - SET_CH_64(chip, chan->dir, chan->id, llp.reg, > > > > - chunk->ll_region.paddr); > > > > - #else /* CONFIG_64BIT */ > > > > + if ((chan->chip->flags & DW_EDMA_CHIP_32BIT_DBI) || > > > > + !IS_ENABLED(CONFIG_64BIT)) { > > > > SET_CH_32(chip, chan->dir, chan->id, llp.lsb, > > > > lower_32_bits(chunk->ll_region.paddr)); > > > > SET_CH_32(chip, chan->dir, chan->id, llp.msb, > > > > upper_32_bits(chunk->ll_region.paddr)); > > > > - #endif /* CONFIG_64BIT */ > > > > + } else { > > > > + SET_CH_64(chip, chan->dir, chan->id, llp.reg, > > > > + chunk->ll_region.paddr); > > > > + } > > > > } > > > > /* Doorbell */ > > > > SET_RW_32(chip, chan->dir, doorbell, > > > > diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h > > > > index fcfbc0f47f83d..4321f6378ef66 100644 > > > > --- a/include/linux/dma/edma.h > > > > +++ b/include/linux/dma/edma.h > > > > @@ -33,6 +33,12 @@ enum dw_edma_map_format { > > > > EDMA_MF_HDMA_COMPAT = 0x5 > > > > }; > > > > > > > > +/* Probe EDMA engine locally and prevent generate MSI to host side*/ > > > > +#define DW_EDMA_CHIP_LOCAL BIT(0) > > > > + > > > > +/* Only support 32bit DBI register access */ > > > > +#define DW_EDMA_CHIP_32BIT_DBI BIT(1) > > > > + > > > > > > How about using an enum for defining the flags? This would help us organize the > > > flags in a more coherent way and also will give the benefit of kdoc. > > > > Did you see other linux code use enum as bitmask? > > According to my understanding, enum just chooses values in a list. > There are lot of places it is used: $ grep -r "= BIT(.*)," include/ > Do you agree that using define because it will be used as bitmask? > As I said, using enum helps in organizing the flags and it also provides kdoc. I'd prefer to go with it. Thanks, Mani > best regards > Frank Li > > > > > > > > > /** > > > * enum dw_edma_chip_flags - Flags specific to an eDMA chip > > > * @DW_EDMA_CHIP_LOCAL: eDMA is used locally by an endpoint > > > * @DW_EDMA_CHIP_32BIT_DBI: eDMA only supports 32bit DBI access > > > */ > > > enum dw_edma_chip_flags { > > > DW_EDMA_CHIP_LOCAL = BIT(0), > > > DW_EDMA_CHIP_32BIT_DBI = BIT(1), > > > }; > > > > > > > /** > > > > * struct dw_edma_chip - representation of DesignWare eDMA controller hardware > > > > * @dev: struct device of the eDMA controller > > > > @@ -40,6 +46,8 @@ enum dw_edma_map_format { > > > > * @nr_irqs: total dma irq number > > > > * reg64bit if support 64bit write to register > > > > * @ops DMA channel to IRQ number mapping > > > > + * @flags - DW_EDMA_CHIP_LOCAL > > > > + * - DW_EDMA_CHIP_32BIT_DBI > > > > > > No need to mention the flags here if you use the enum I suggested above. > > > > > > > * @wr_ch_cnt DMA write channel number > > > > * @rd_ch_cnt DMA read channel number > > > > * @rg_region DMA register region > > > > @@ -53,6 +61,7 @@ struct dw_edma_chip { > > > > int id; > > > > int nr_irqs; > > > > const struct dw_edma_core_ops *ops; > > > > + u32 flags; > > > > > > enum dw_edma_chip_flags flags; > > > > > > Thanks, > > > Mani > > > > > > > > > > > void __iomem *reg_base; > > > > > > > > -- > > > > 2.24.0.rc1 > > > >
diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c index 6e2f83e31a03a..081cd7997348d 100644 --- a/drivers/dma/dw-edma/dw-edma-v0-core.c +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c @@ -307,6 +307,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma_chip *chip, enum dw_edma_dir static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) { struct dw_edma_burst *child; + struct dw_edma_chan *chan = chunk->chan; struct dw_edma_v0_lli __iomem *lli; struct dw_edma_v0_llp __iomem *llp; u32 control = 0, i = 0; @@ -320,9 +321,11 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) j = chunk->bursts_alloc; list_for_each_entry(child, &chunk->burst->list, list) { j--; - if (!j) - control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE); - + if (!j) { + control |= DW_EDMA_V0_LIE; + if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) + control |= DW_EDMA_V0_RIE; + } /* Channel control */ SET_LL_32(&lli[i].control, control); /* Transfer size */ @@ -420,15 +423,16 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) SET_CH_32(chip, chan->dir, chan->id, ch_control1, (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE)); /* Linked list */ - #ifdef CONFIG_64BIT - SET_CH_64(chip, chan->dir, chan->id, llp.reg, - chunk->ll_region.paddr); - #else /* CONFIG_64BIT */ + if ((chan->chip->flags & DW_EDMA_CHIP_32BIT_DBI) || + !IS_ENABLED(CONFIG_64BIT)) { SET_CH_32(chip, chan->dir, chan->id, llp.lsb, lower_32_bits(chunk->ll_region.paddr)); SET_CH_32(chip, chan->dir, chan->id, llp.msb, upper_32_bits(chunk->ll_region.paddr)); - #endif /* CONFIG_64BIT */ + } else { + SET_CH_64(chip, chan->dir, chan->id, llp.reg, + chunk->ll_region.paddr); + } } /* Doorbell */ SET_RW_32(chip, chan->dir, doorbell, diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h index fcfbc0f47f83d..4321f6378ef66 100644 --- a/include/linux/dma/edma.h +++ b/include/linux/dma/edma.h @@ -33,6 +33,12 @@ enum dw_edma_map_format { EDMA_MF_HDMA_COMPAT = 0x5 }; +/* Probe EDMA engine locally and prevent generate MSI to host side*/ +#define DW_EDMA_CHIP_LOCAL BIT(0) + +/* Only support 32bit DBI register access */ +#define DW_EDMA_CHIP_32BIT_DBI BIT(1) + /** * struct dw_edma_chip - representation of DesignWare eDMA controller hardware * @dev: struct device of the eDMA controller @@ -40,6 +46,8 @@ enum dw_edma_map_format { * @nr_irqs: total dma irq number * reg64bit if support 64bit write to register * @ops DMA channel to IRQ number mapping + * @flags - DW_EDMA_CHIP_LOCAL + * - DW_EDMA_CHIP_32BIT_DBI * @wr_ch_cnt DMA write channel number * @rd_ch_cnt DMA read channel number * @rg_region DMA register region @@ -53,6 +61,7 @@ struct dw_edma_chip { int id; int nr_irqs; const struct dw_edma_core_ops *ops; + u32 flags; void __iomem *reg_base;
Allow PCI EP probe DMA locally and prevent use of remote MSI to remote PCI host. Add option to force 32bit DBI register access even on 64-bit systems. i.MX8 hardware only allowed 32bit register access. Signed-off-by: Frank Li <Frank.Li@nxp.com> --- Resend added dmaengine@vger.kernel.org Change from v2 to v3 - rework commit message - Change to DW_EDMA_CHIP_32BIT_DBI - using DW_EDMA_CHIP_LOCAL control msi - Apply Bjorn's comments, if (!j) { control |= DW_EDMA_V0_LIE; if (!(chan->chip->flags & DW_EDMA_CHIP_LOCAL)) control |= DW_EDMA_V0_RIE; } if ((chan->chip->flags & DW_EDMA_CHIP_REG32BIT) || !IS_ENABLED(CONFIG_64BIT)) { SET_CH_32(...); SET_CH_32(...); } else { SET_CH_64(...); } Change from v1 to v2 - none drivers/dma/dw-edma/dw-edma-v0-core.c | 20 ++++++++++++-------- include/linux/dma/edma.h | 9 +++++++++ 2 files changed, 21 insertions(+), 8 deletions(-)