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[Qemu-devel] [PATCH 4/4] uninorth: remove token register from uninorth device

Mark Cave-Ayland posted 4 patches 7 years, 9 months ago
[Qemu-devel] [PATCH 4/4] uninorth: remove token register from uninorth device
Posted by Mark Cave-Ayland 7 years, 9 months ago 
From observation of various OS sources it can be seen that the token register
introduced in 4e46dcdbd3 "PPC: Newworld: Add uninorth token register" is not
required, since the only register currently implemented is the uninorth hardware
version which is read-only.

Remove the token register implementation and instead return the uninorth
version corresponding to the hardware.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/pci-host/uninorth.c         | 11 +++++------
 include/hw/pci-host/uninorth.h |  4 +++-
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/hw/pci-host/uninorth.c b/hw/pci-host/uninorth.c
index a658f9230a..abebfaf755 100644
--- a/hw/pci-host/uninorth.c
+++ b/hw/pci-host/uninorth.c
@@ -524,19 +524,18 @@ static void unin_write(void *opaque, hwaddr addr, uint64_t value,
                        unsigned size)
 {
     trace_unin_write(addr, value);
-    if (addr == 0x0) {
-        *(int *)opaque = value;
-    }
 }
 
 static uint64_t unin_read(void *opaque, hwaddr addr, unsigned size)
 {
     uint32_t value;
 
-    value = 0;
     switch (addr) {
     case 0:
-        value = *(int *)opaque;
+        value = UNINORTH_VERSION_10A;
+        break;
+    default:
+        value = 0;
     }
 
     trace_unin_read(addr, value);
@@ -559,7 +558,7 @@ static void unin_init(Object *obj)
     UNINState *s = UNI_NORTH(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 
-    memory_region_init_io(&s->mem, obj, &unin_ops, &s->token, "unin", 0x1000);
+    memory_region_init_io(&s->mem, obj, &unin_ops, s, "unin", 0x1000);
 
     sysbus_init_mmio(sbd, &s->mem);
 }
diff --git a/include/hw/pci-host/uninorth.h b/include/hw/pci-host/uninorth.h
index f6654bad9b..2a1cf9f284 100644
--- a/include/hw/pci-host/uninorth.h
+++ b/include/hw/pci-host/uninorth.h
@@ -29,6 +29,9 @@
 
 #include "hw/ppc/openpic.h"
 
+/* UniNorth version */
+#define UNINORTH_VERSION_10A    0x7
+
 #define TYPE_UNI_NORTH_PCI_HOST_BRIDGE "uni-north-pci-pcihost"
 #define TYPE_UNI_NORTH_AGP_HOST_BRIDGE "uni-north-agp-pcihost"
 #define TYPE_UNI_NORTH_INTERNAL_PCI_HOST_BRIDGE "uni-north-internal-pci-pcihost"
@@ -57,7 +60,6 @@ typedef struct UNINState {
     SysBusDevice parent_obj;
 
     MemoryRegion mem;
-    int token[1];
 } UNINState;
 
 #define TYPE_UNI_NORTH "uni-north"
-- 
2.11.0
Re: [Qemu-devel] [PATCH 4/4] uninorth: remove token register from uninorth device
Posted by Philippe Mathieu-Daudé 7 years, 9 months ago 
On 05/06/2018 11:20 AM, Mark Cave-Ayland wrote:
> From observation of various OS sources it can be seen that the token register
> introduced in 4e46dcdbd3 "PPC: Newworld: Add uninorth token register" is not
> required, since the only register currently implemented is the uninorth hardware
> version which is read-only.
> 
> Remove the token register implementation and instead return the uninorth
> version corresponding to the hardware.

Thanks for this cleanup :)

> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

> ---
>  hw/pci-host/uninorth.c         | 11 +++++------
>  include/hw/pci-host/uninorth.h |  4 +++-
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/pci-host/uninorth.c b/hw/pci-host/uninorth.c
> index a658f9230a..abebfaf755 100644
> --- a/hw/pci-host/uninorth.c
> +++ b/hw/pci-host/uninorth.c
> @@ -524,19 +524,18 @@ static void unin_write(void *opaque, hwaddr addr, uint64_t value,
>                         unsigned size)
>  {
>      trace_unin_write(addr, value);
> -    if (addr == 0x0) {
> -        *(int *)opaque = value;
> -    }
>  }
>  
>  static uint64_t unin_read(void *opaque, hwaddr addr, unsigned size)
>  {
>      uint32_t value;
>  
> -    value = 0;
>      switch (addr) {
>      case 0:
> -        value = *(int *)opaque;
> +        value = UNINORTH_VERSION_10A;
> +        break;
> +    default:
> +        value = 0;
>      }
>  
>      trace_unin_read(addr, value);
> @@ -559,7 +558,7 @@ static void unin_init(Object *obj)
>      UNINState *s = UNI_NORTH(obj);
>      SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
>  
> -    memory_region_init_io(&s->mem, obj, &unin_ops, &s->token, "unin", 0x1000);
> +    memory_region_init_io(&s->mem, obj, &unin_ops, s, "unin", 0x1000);
>  
>      sysbus_init_mmio(sbd, &s->mem);
>  }
> diff --git a/include/hw/pci-host/uninorth.h b/include/hw/pci-host/uninorth.h
> index f6654bad9b..2a1cf9f284 100644
> --- a/include/hw/pci-host/uninorth.h
> +++ b/include/hw/pci-host/uninorth.h
> @@ -29,6 +29,9 @@
>  
>  #include "hw/ppc/openpic.h"
>  
> +/* UniNorth version */
> +#define UNINORTH_VERSION_10A    0x7
> +
>  #define TYPE_UNI_NORTH_PCI_HOST_BRIDGE "uni-north-pci-pcihost"
>  #define TYPE_UNI_NORTH_AGP_HOST_BRIDGE "uni-north-agp-pcihost"
>  #define TYPE_UNI_NORTH_INTERNAL_PCI_HOST_BRIDGE "uni-north-internal-pci-pcihost"
> @@ -57,7 +60,6 @@ typedef struct UNINState {
>      SysBusDevice parent_obj;
>  
>      MemoryRegion mem;
> -    int token[1];
>  } UNINState;
>  
>  #define TYPE_UNI_NORTH "uni-north"
>
Re: [Qemu-devel] [PATCH 4/4] uninorth: remove token register from uninorth device
Posted by David Gibson 7 years, 8 months ago 
On Sun, May 06, 2018 at 03:20:05PM +0100, Mark Cave-Ayland wrote:
> >From observation of various OS sources it can be seen that the token register
> introduced in 4e46dcdbd3 "PPC: Newworld: Add uninorth token register" is not
> required, since the only register currently implemented is the uninorth hardware
> version which is read-only.
> 
> Remove the token register implementation and instead return the uninorth
> version corresponding to the hardware.
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

Applied, thanks.

> ---
>  hw/pci-host/uninorth.c         | 11 +++++------
>  include/hw/pci-host/uninorth.h |  4 +++-
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/pci-host/uninorth.c b/hw/pci-host/uninorth.c
> index a658f9230a..abebfaf755 100644
> --- a/hw/pci-host/uninorth.c
> +++ b/hw/pci-host/uninorth.c
> @@ -524,19 +524,18 @@ static void unin_write(void *opaque, hwaddr addr, uint64_t value,
>                         unsigned size)
>  {
>      trace_unin_write(addr, value);
> -    if (addr == 0x0) {
> -        *(int *)opaque = value;
> -    }
>  }
>  
>  static uint64_t unin_read(void *opaque, hwaddr addr, unsigned size)
>  {
>      uint32_t value;
>  
> -    value = 0;
>      switch (addr) {
>      case 0:
> -        value = *(int *)opaque;
> +        value = UNINORTH_VERSION_10A;
> +        break;
> +    default:
> +        value = 0;
>      }
>  
>      trace_unin_read(addr, value);
> @@ -559,7 +558,7 @@ static void unin_init(Object *obj)
>      UNINState *s = UNI_NORTH(obj);
>      SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
>  
> -    memory_region_init_io(&s->mem, obj, &unin_ops, &s->token, "unin", 0x1000);
> +    memory_region_init_io(&s->mem, obj, &unin_ops, s, "unin", 0x1000);
>  
>      sysbus_init_mmio(sbd, &s->mem);
>  }
> diff --git a/include/hw/pci-host/uninorth.h b/include/hw/pci-host/uninorth.h
> index f6654bad9b..2a1cf9f284 100644
> --- a/include/hw/pci-host/uninorth.h
> +++ b/include/hw/pci-host/uninorth.h
> @@ -29,6 +29,9 @@
>  
>  #include "hw/ppc/openpic.h"
>  
> +/* UniNorth version */
> +#define UNINORTH_VERSION_10A    0x7
> +
>  #define TYPE_UNI_NORTH_PCI_HOST_BRIDGE "uni-north-pci-pcihost"
>  #define TYPE_UNI_NORTH_AGP_HOST_BRIDGE "uni-north-agp-pcihost"
>  #define TYPE_UNI_NORTH_INTERNAL_PCI_HOST_BRIDGE "uni-north-internal-pci-pcihost"
> @@ -57,7 +60,6 @@ typedef struct UNINState {
>      SysBusDevice parent_obj;
>  
>      MemoryRegion mem;
> -    int token[1];
>  } UNINState;
>  
>  #define TYPE_UNI_NORTH "uni-north"

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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