Hi Edgar, I got your suggestion below. Will be sending a V2 asap.
Thanks, Sai Pavan > -----Original Message----- > From: Edgar E. Iglesias [mailto:[email protected]] > Sent: Thursday, June 14, 2018 4:55 PM > To: Sai Pavan Boddu <[email protected]> > Cc: [email protected]; Alistair Francis <[email protected]>; Peter > Crosthwaite <[email protected]>; Peter Maydell > <[email protected]>; Francisco Iglesias <[email protected]> > Subject: Re: [PATCH] xilinx_spips: Make dma transactions as per dma_burst_size > > On Thu, Jun 14, 2018 at 10:57:04AM +0530, Sai Pavan Boddu wrote: > > Qspi dma has a burst length of 64 bytes, So limit transaction length > > to > > 64 max. > > Hi Sai, > > Is this a v2 or a resend? > > > > > Signed-off-by: Sai Pavan Boddu <[email protected]> > > --- > > hw/ssi/xilinx_spips.c | 18 +++++++++++++++--- > > include/hw/ssi/xilinx_spips.h | 3 ++- > > 2 files changed, 17 insertions(+), 4 deletions(-) > > > > diff --git a/hw/ssi/xilinx_spips.c b/hw/ssi/xilinx_spips.c index > > 03f5fae..ea006c4 100644 > > --- a/hw/ssi/xilinx_spips.c > > +++ b/hw/ssi/xilinx_spips.c > > @@ -851,12 +851,17 @@ static void xlnx_zynqmp_qspips_notify(void > *opaque) > > { > > size_t ret; > > uint32_t num; > > - const void *rxd = pop_buf(recv_fifo, 4, &num); > > + const void *rxd; > > + int len; > > + > > + len = recv_fifo->num >= rq->dma_burst_size ? rq->dma_burst_size : > > + recv_fifo->num; > > + rxd = pop_buf(recv_fifo, len, &num); > > > > memcpy(rq->dma_buf, rxd, num); > > > > - ret = stream_push(rq->dma, rq->dma_buf, 4); > > - assert(ret == 4); > > + ret = stream_push(rq->dma, rq->dma_buf, num); > > + assert(ret == num); > > xlnx_zynqmp_qspips_check_flush(rq); > > } > > } > > @@ -1337,6 +1342,7 @@ static void xlnx_zynqmp_qspips_realize(DeviceState > *dev, Error **errp) > > fifo8_create(&s->rx_fifo_g, xsc->rx_fifo_size); > > fifo8_create(&s->tx_fifo_g, xsc->tx_fifo_size); > > fifo32_create(&s->fifo_g, 32); > > + s->dma_buf = g_new0(uint8_t, s->dma_burst_size); > > > This would need to be free'd somewhere. > But I think you should put a reasonably small limit on the burst size that > users > can configure and then you can allocate this as an array in XlnxZynqMPQSPIPS. > > > > > } > > > > static void xlnx_zynqmp_qspips_init(Object *obj) @@ -1411,6 +1417,11 > > @@ static const VMStateDescription vmstate_xlnx_zynqmp_qspips = { > > } > > }; > > > > +static Property xilinx_zynqmp_qspips_properties[] = { > > + DEFINE_PROP_UINT32("dma-burst-size", XlnxZynqMPQSPIPS, > > +dma_burst_size, 64), > > You need to limit this so users dont pick 4G. Perhaps 2 or 4K max. > > Cheers, > Edgar > > > > + DEFINE_PROP_END_OF_LIST(), > > +}; > > + > > static Property xilinx_qspips_properties[] = { > > /* We had to turn this off for 2.10 as it is not compatible with > > migration. > > * It can be enabled but will prevent the device to be migrated. > > @@ -1463,6 +1474,7 @@ static void > xlnx_zynqmp_qspips_class_init(ObjectClass *klass, void * data) > > dc->realize = xlnx_zynqmp_qspips_realize; > > dc->reset = xlnx_zynqmp_qspips_reset; > > dc->vmsd = &vmstate_xlnx_zynqmp_qspips; > > + dc->props = xilinx_zynqmp_qspips_properties; > > xsc->reg_ops = &xlnx_zynqmp_qspips_ops; > > xsc->rx_fifo_size = RXFF_A_Q; > > xsc->tx_fifo_size = TXFF_A_Q; > > diff --git a/include/hw/ssi/xilinx_spips.h > > b/include/hw/ssi/xilinx_spips.h index d398a4e..cca1813 100644 > > --- a/include/hw/ssi/xilinx_spips.h > > +++ b/include/hw/ssi/xilinx_spips.h > > @@ -95,7 +95,8 @@ typedef struct { > > XilinxQSPIPS parent_obj; > > > > StreamSlave *dma; > > - uint8_t dma_buf[4]; > > + uint8_t *dma_buf; > > + uint32_t dma_burst_size; > > int gqspi_irqline; > > > > uint32_t regs[XLNX_ZYNQMP_SPIPS_R_MAX]; > > -- > > 2.7.4 > >
