Re: [Qemu-devel] [PATCH target-arm v3 7/7] arm: xlnx-zynqmp: Add 2xCortexR5 CPUs

["Edgar E. Iglesias" <edgar.iglesias@xilinx.com>]

On Tue, Jun 16, 2015 at 06:21:56PM -0700, Peter Crosthwaite wrote:
> On Tue, Jun 16, 2015 at 6:12 PM, Edgar E. Iglesias
> <edgar.iglesias@xilinx.com> wrote:
> > On Tue, Jun 16, 2015 at 06:09:22PM -0700, Peter Crosthwaite wrote:
> >> On Tue, Jun 16, 2015 at 5:54 PM, Edgar E. Iglesias
> >> <edgar.iglesias@xilinx.com> wrote:
> >> > On Tue, Jun 16, 2015 at 05:36:19PM -0700, Peter Crosthwaite wrote:
> >> >> Add the 2xCortexR5 CPUs to zynqmp board. They are powered off on reset
> >> >> (this is true of real hardware) by default or selectable as the boot
> >> >> processor.
> >> >
> >> > Hi Peter,
> >> >
> >> > I think it would be good if you could model at least a minimal
> >> > way to release the R5s from reset the "real" way. The R5s are
> >> > not covered by PSCI in real code and not all code uses PSCI,
> >> > in particular not any R5 code.
> >> >
> >> > How would the R5s be useful with upstream with this version?
> >> > Maybe I'm missing something.
> >> >
> >>
> >> You can nominate an R5 instead of A53 as the one non-powered-off cpu
> >> by setting the zynqmp boot-cpu property with -global:
> >>
> >> $ qemu-system-aarch64 -M xlnx-ep108 -m 2048 -nographic -kernel
> >> ./r5_image.elf -global xlnx,zynqmp.boot-cpu="rpu-cpu[0]"
> >>
> >> This works with elf boots.
> >
> > In that mode, how do I release the A53s (or the other R5)?
> > Will it be either one R5 or the A53s?
> >
> 
> Just one or the other so far unless you do a backdoor PSCI release
> from SW. Loading multiple softwares needs either a more dynamic

Note that you can't do PSCI from the R5s. The A53s could wake the R5s
with PSCI in this QEMU but not on real SW stack which is a little confusing...

> bootloader process or the reset controller model, both of which I want
> to follow up later with.

OK, it's quite limited ATM but I guess it's a step forward...

Thanks,
Edgar




> 
> Regards,
> Peter
> 
> > Cheers,
> > Edgar
> >
> >
> >>
> >> Regards,
> >> Peter
> >>
> >> > Cheers,
> >> > Edgar
> >> >
> >> >
> >> >>
> >> >> Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
> >> >> ---
> >> >> changed since v2:
> >> >> Add boot-cpu start-powered-off conditional
> >> >> changed since v1:
> >> >> s/rcpu/rpu-cpu/
> >> >>
> >> >>  hw/arm/xlnx-zynqmp.c         | 34 ++++++++++++++++++++++++++++++++++
> >> >>  include/hw/arm/xlnx-zynqmp.h |  2 ++
> >> >>  2 files changed, 36 insertions(+)
> >> >>
> >> >> diff --git a/hw/arm/xlnx-zynqmp.c b/hw/arm/xlnx-zynqmp.c
> >> >> index 0c966da..5e72078 100644
> >> >> --- a/hw/arm/xlnx-zynqmp.c
> >> >> +++ b/hw/arm/xlnx-zynqmp.c
> >> >> @@ -71,6 +71,13 @@ static void xlnx_zynqmp_init(Object *obj)
> >> >>                                    &error_abort);
> >> >>      }
> >> >>
> >> >> +    for (i = 0; i < XLNX_ZYNQMP_NUM_RPU_CPUS; i++) {
> >> >> +        object_initialize(&s->rpu_cpu[i], sizeof(s->rpu_cpu[i]),
> >> >> +                          "cortex-r5-" TYPE_ARM_CPU);
> >> >> +        object_property_add_child(obj, "rpu-cpu[*]", OBJECT(&s->rpu_cpu[i]),
> >> >> +                                  &error_abort);
> >> >> +    }
> >> >> +
> >> >>      object_initialize(&s->gic, sizeof(s->gic), TYPE_ARM_GIC);
> >> >>      qdev_set_parent_bus(DEVICE(&s->gic), sysbus_get_default());
> >> >>
> >> >> @@ -163,6 +170,33 @@ static void xlnx_zynqmp_realize(DeviceState *dev, Error **errp)
> >> >>          qdev_connect_gpio_out(DEVICE(&s->apu_cpu[i]), 1, irq);
> >> >>      }
> >> >>
> >> >> +    for (i = 0; i < XLNX_ZYNQMP_NUM_RPU_CPUS; i++) {
> >> >> +        char *name;
> >> >> +
> >> >> +        name = object_get_canonical_path_component(OBJECT(&s->rpu_cpu[i]));
> >> >> +        if (strcmp(name, boot_cpu)) {
> >> >> +            /* Secondary CPUs start in PSCI powered-down state */
> >> >> +            object_property_set_bool(OBJECT(&s->rpu_cpu[i]), true,
> >> >> +                                     "start-powered-off", &error_abort);
> >> >> +        } else {
> >> >> +            s->boot_cpu_ptr = &s->rpu_cpu[i];
> >> >> +        }
> >> >> +
> >> >> +        object_property_set_bool(OBJECT(&s->rpu_cpu[i]), true, "reset-hivecs",
> >> >> +                                 &err);
> >> >> +        if (err != NULL) {
> >> >> +            error_propagate(errp, err);
> >> >> +            return;
> >> >> +        }
> >> >> +
> >> >> +        object_property_set_bool(OBJECT(&s->rpu_cpu[i]), true, "realized",
> >> >> +                                 &err);
> >> >> +        if (err) {
> >> >> +            error_propagate((errp), (err));
> >> >> +            return;
> >> >> +        }
> >> >> +    }
> >> >> +
> >> >>      if (!s->boot_cpu_ptr) {
> >> >>          error_setg(errp, "ZynqMP Boot cpu %s not found\n", boot_cpu);
> >> >>          return;
> >> >> diff --git a/include/hw/arm/xlnx-zynqmp.h b/include/hw/arm/xlnx-zynqmp.h
> >> >> index 4f14a22..c379632 100644
> >> >> --- a/include/hw/arm/xlnx-zynqmp.h
> >> >> +++ b/include/hw/arm/xlnx-zynqmp.h
> >> >> @@ -28,6 +28,7 @@
> >> >>                                         TYPE_XLNX_ZYNQMP)
> >> >>
> >> >>  #define XLNX_ZYNQMP_NUM_APU_CPUS 4
> >> >> +#define XLNX_ZYNQMP_NUM_RPU_CPUS 2
> >> >>  #define XLNX_ZYNQMP_NUM_GEMS 4
> >> >>  #define XLNX_ZYNQMP_NUM_UARTS 2
> >> >>
> >> >> @@ -48,6 +49,7 @@ typedef struct XlnxZynqMPState {
> >> >>
> >> >>      /*< public >*/
> >> >>      ARMCPU apu_cpu[XLNX_ZYNQMP_NUM_APU_CPUS];
> >> >> +    ARMCPU rpu_cpu[XLNX_ZYNQMP_NUM_RPU_CPUS];
> >> >>      GICState gic;
> >> >>      MemoryRegion gic_mr[XLNX_ZYNQMP_GIC_REGIONS][XLNX_ZYNQMP_GIC_ALIASES];
> >> >>      CadenceGEMState gem[XLNX_ZYNQMP_NUM_GEMS];
> >> >> --
> >> >> 2.4.3.3.g905f831
> >> >>
> >> >
> >