| Message ID | 1376907568-18689-1-git-send-email-andre.przywara@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 08/19/2013 05:19 AM, Andre Przywara wrote: > When dma_addr_t is 64 bits long, compilation of the AMBA PL08x DMA > driver breaks due to a missing 64bit%8bit modulo operation. > Looking more closely the divisor in these operations can only be > 1, 2 or 4, so the full featured '%' modulo operation is overkill and > can be replaced with simple bit masking. > > Change from v1: > Replace open-coded function with existing IS_ALIGNED macro and use a > macro around that to avoid a line becoming too long. > > Signed-off-by: Andre Przywara <andre.przywara@linaro.org> Vinod, Can I have your ack and take this thru arm-soc tree. I'm dependent on this to select 64-bit dma_addr_t for highbank. Rob > --- > drivers/dma/amba-pl08x.c | 14 ++++++++------ > 1 file changed, 8 insertions(+), 6 deletions(-) > > diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c > index bce5fbf..bff41d4 100644 > --- a/drivers/dma/amba-pl08x.c > +++ b/drivers/dma/amba-pl08x.c > @@ -133,6 +133,8 @@ struct pl08x_bus_data { > u8 buswidth; > }; > > +#define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth) > + > /** > * struct pl08x_phy_chan - holder for the physical channels > * @id: physical index to this channel > @@ -889,8 +891,8 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, > return 0; > } > > - if ((bd.srcbus.addr % bd.srcbus.buswidth) || > - (bd.dstbus.addr % bd.dstbus.buswidth)) { > + if (!IS_BUS_ALIGNED(&bd.srcbus) || > + !IS_BUS_ALIGNED(&bd.dstbus)) { > dev_err(&pl08x->adev->dev, > "%s src & dst address must be aligned to src" > " & dst width if peripheral is flow controller", > @@ -911,9 +913,9 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, > */ > if (bd.remainder < mbus->buswidth) > early_bytes = bd.remainder; > - else if ((mbus->addr) % (mbus->buswidth)) { > - early_bytes = mbus->buswidth - (mbus->addr) % > - (mbus->buswidth); > + else if (!IS_BUS_ALIGNED(mbus)) { > + early_bytes = mbus->buswidth - > + (mbus->addr & (mbus->buswidth - 1)); > if ((bd.remainder - early_bytes) < mbus->buswidth) > early_bytes = bd.remainder; > } > @@ -931,7 +933,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, > * Master now aligned > * - if slave is not then we must set its width down > */ > - if (sbus->addr % sbus->buswidth) { > + if (!IS_BUS_ALIGNED(sbus)) { > dev_dbg(&pl08x->adev->dev, > "%s set down bus width to one byte\n", > __func__); >
On Mon, Aug 19, 2013 at 12:19:28PM +0200, Andre Przywara wrote: > When dma_addr_t is 64 bits long, compilation of the AMBA PL08x DMA > driver breaks due to a missing 64bit%8bit modulo operation. > Looking more closely the divisor in these operations can only be > 1, 2 or 4, so the full featured '%' modulo operation is overkill and > can be replaced with simple bit masking. > > Change from v1: > Replace open-coded function with existing IS_ALIGNED macro and use a > macro around that to avoid a line becoming too long. > > Signed-off-by: Andre Przywara <andre.przywara@linaro.org> Acked-by: Vinod Koul <vinod.koul@intel.com> ~Vinod > --- > drivers/dma/amba-pl08x.c | 14 ++++++++------ > 1 file changed, 8 insertions(+), 6 deletions(-) > > diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c > index bce5fbf..bff41d4 100644 > --- a/drivers/dma/amba-pl08x.c > +++ b/drivers/dma/amba-pl08x.c > @@ -133,6 +133,8 @@ struct pl08x_bus_data { > u8 buswidth; > }; > > +#define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth) > + > /** > * struct pl08x_phy_chan - holder for the physical channels > * @id: physical index to this channel > @@ -889,8 +891,8 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, > return 0; > } > > - if ((bd.srcbus.addr % bd.srcbus.buswidth) || > - (bd.dstbus.addr % bd.dstbus.buswidth)) { > + if (!IS_BUS_ALIGNED(&bd.srcbus) || > + !IS_BUS_ALIGNED(&bd.dstbus)) { > dev_err(&pl08x->adev->dev, > "%s src & dst address must be aligned to src" > " & dst width if peripheral is flow controller", > @@ -911,9 +913,9 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, > */ > if (bd.remainder < mbus->buswidth) > early_bytes = bd.remainder; > - else if ((mbus->addr) % (mbus->buswidth)) { > - early_bytes = mbus->buswidth - (mbus->addr) % > - (mbus->buswidth); > + else if (!IS_BUS_ALIGNED(mbus)) { > + early_bytes = mbus->buswidth - > + (mbus->addr & (mbus->buswidth - 1)); > if ((bd.remainder - early_bytes) < mbus->buswidth) > early_bytes = bd.remainder; > } > @@ -931,7 +933,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, > * Master now aligned > * - if slave is not then we must set its width down > */ > - if (sbus->addr % sbus->buswidth) { > + if (!IS_BUS_ALIGNED(sbus)) { > dev_dbg(&pl08x->adev->dev, > "%s set down bus width to one byte\n", > __func__); > -- > 1.7.12.1 >
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index bce5fbf..bff41d4 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -133,6 +133,8 @@ struct pl08x_bus_data { u8 buswidth; }; +#define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth) + /** * struct pl08x_phy_chan - holder for the physical channels * @id: physical index to this channel @@ -889,8 +891,8 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, return 0; } - if ((bd.srcbus.addr % bd.srcbus.buswidth) || - (bd.dstbus.addr % bd.dstbus.buswidth)) { + if (!IS_BUS_ALIGNED(&bd.srcbus) || + !IS_BUS_ALIGNED(&bd.dstbus)) { dev_err(&pl08x->adev->dev, "%s src & dst address must be aligned to src" " & dst width if peripheral is flow controller", @@ -911,9 +913,9 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, */ if (bd.remainder < mbus->buswidth) early_bytes = bd.remainder; - else if ((mbus->addr) % (mbus->buswidth)) { - early_bytes = mbus->buswidth - (mbus->addr) % - (mbus->buswidth); + else if (!IS_BUS_ALIGNED(mbus)) { + early_bytes = mbus->buswidth - + (mbus->addr & (mbus->buswidth - 1)); if ((bd.remainder - early_bytes) < mbus->buswidth) early_bytes = bd.remainder; } @@ -931,7 +933,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, * Master now aligned * - if slave is not then we must set its width down */ - if (sbus->addr % sbus->buswidth) { + if (!IS_BUS_ALIGNED(sbus)) { dev_dbg(&pl08x->adev->dev, "%s set down bus width to one byte\n", __func__);
When dma_addr_t is 64 bits long, compilation of the AMBA PL08x DMA driver breaks due to a missing 64bit%8bit modulo operation. Looking more closely the divisor in these operations can only be 1, 2 or 4, so the full featured '%' modulo operation is overkill and can be replaced with simple bit masking. Change from v1: Replace open-coded function with existing IS_ALIGNED macro and use a macro around that to avoid a line becoming too long. Signed-off-by: Andre Przywara <andre.przywara@linaro.org> --- drivers/dma/amba-pl08x.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)