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Re: [PATCH v4 02/20] nubus-device: expose separate super slot memory reg
From: |
Laurent Vivier |
Subject: |
Re: [PATCH v4 02/20] nubus-device: expose separate super slot memory region |
Date: |
Mon, 20 Sep 2021 21:54:25 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 |
Le 17/09/2021 à 09:50, Mark Cave-Ayland a écrit :
> According to "Designing Cards and Drivers for the Macintosh Family" each
> physical
> nubus slot can access 2 separate address ranges: a super slot memory region
> which
> is 256MB and a standard slot memory region which is 16MB.
>
> Currently a Nubus device uses the physical slot number to determine whether
> it is
> using a standard slot memory region or a super slot memory region rather than
> exposing both memory regions for use as required.
>
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
> hw/nubus/nubus-device.c | 36 ++++++++++++++++++------------------
> include/hw/nubus/nubus.h | 1 +
> 2 files changed, 19 insertions(+), 18 deletions(-)
>
> diff --git a/hw/nubus/nubus-device.c b/hw/nubus/nubus-device.c
> index be01269563..36203848e5 100644
> --- a/hw/nubus/nubus-device.c
> +++ b/hw/nubus/nubus-device.c
> @@ -168,26 +168,26 @@ static void nubus_device_realize(DeviceState *dev,
> Error **errp)
> }
>
> nd->slot = nubus->current_slot++;
> - name = g_strdup_printf("nubus-slot-%d", nd->slot);
> -
> - if (nd->slot < NUBUS_FIRST_SLOT) {
> - /* Super */
> - slot_offset = (nd->slot - 6) * NUBUS_SUPER_SLOT_SIZE;
> -
> - memory_region_init(&nd->slot_mem, OBJECT(dev), name,
> - NUBUS_SUPER_SLOT_SIZE);
> - memory_region_add_subregion(&nubus->super_slot_io, slot_offset,
> - &nd->slot_mem);
> - } else {
> - /* Normal */
> - slot_offset = nd->slot * NUBUS_SLOT_SIZE;
> -
> - memory_region_init(&nd->slot_mem, OBJECT(dev), name,
> NUBUS_SLOT_SIZE);
> - memory_region_add_subregion(&nubus->slot_io, slot_offset,
> - &nd->slot_mem);
> - }
>
> + /* Super */
> + slot_offset = (nd->slot - 6) * NUBUS_SUPER_SLOT_SIZE;
> +
Is it possible to remove this patch?
The "(nd->slot - 6)" looks weird and it is removed in patch 20.
If not:
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Thanks,
Laurent
- [PATCH v4 00/20] nubus: bus, device, bridge, IRQ and address space improvements, Mark Cave-Ayland, 2021/09/17
- [PATCH v4 01/20] nubus-device: rename slot_nb variable to slot, Mark Cave-Ayland, 2021/09/17
- [PATCH v4 02/20] nubus-device: expose separate super slot memory region, Mark Cave-Ayland, 2021/09/17
- Re: [PATCH v4 02/20] nubus-device: expose separate super slot memory region,
Laurent Vivier <=
- [PATCH v4 03/20] nubus-device: add device slot parameter, Mark Cave-Ayland, 2021/09/17
- [PATCH v4 04/20] nubus: use bitmap to manage available slots, Mark Cave-Ayland, 2021/09/17
- [PATCH v4 05/20] nubus: move slot bitmap checks from NubusDevice realize() to BusClass check_address(), Mark Cave-Ayland, 2021/09/17