[Nouveau] [PATCH v3 1/3] device: rework mmio mapping code to get rid of second map

[Ben Skeggs]

Merged all 3 patches.  Thanks!

On Wed, 29 Apr 2020 at 02:55, Karol Herbst <kherbst at redhat.com> wrote:
>
> Fixes warnings on GPUs with smaller a smaller mmio region like vGPUs.
>
> Signed-off-by: Karol Herbst <kherbst at redhat.com>
> ---
>  drm/nouveau/nvkm/engine/device/base.c | 27 +++++++++++++++------------
>  1 file changed, 15 insertions(+), 12 deletions(-)
>
> diff --git a/drm/nouveau/nvkm/engine/device/base.c b/drm/nouveau/nvkm/engine/device/base.c
> index 8ebbe1656..37589f365 100644
> --- a/drm/nouveau/nvkm/engine/device/base.c
> +++ b/drm/nouveau/nvkm/engine/device/base.c
> @@ -2935,7 +2935,7 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
>         struct nvkm_subdev *subdev;
>         u64 mmio_base, mmio_size;
>         u32 boot0, strap;
> -       void __iomem *map;
> +       void __iomem *map = NULL;
>         int ret = -EEXIST, i;
>         unsigned chipset;
>
> @@ -2961,12 +2961,17 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
>         mmio_base = device->func->resource_addr(device, 0);
>         mmio_size = device->func->resource_size(device, 0);
>
> -       /* identify the chipset, and determine classes of subdev/engines */
> -       if (detect) {
> -               map = ioremap(mmio_base, 0x102000);
> -               if (ret = -ENOMEM, map == NULL)
> +       if (detect || mmio) {
> +               map = ioremap(mmio_base, mmio_size);
> +               if (map == NULL) {
> +                       nvdev_error(device, "unable to map PRI\n");
> +                       ret = -ENOMEM;
>                         goto done;
> +               }
> +       }
>
> +       /* identify the chipset, and determine classes of subdev/engines */
> +       if (detect) {
>                 /* switch mmio to cpu's native endianness */
>  #ifndef __BIG_ENDIAN
>                 if (ioread32_native(map + 0x000004) != 0x00000000) {
> @@ -2980,7 +2985,6 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
>                 /* read boot0 and strapping information */
>                 boot0 = ioread32_native(map + 0x000000);
>                 strap = ioread32_native(map + 0x101000);
> -               iounmap(map);
>
>                 /* chipset can be overridden for devel/testing purposes */
>                 chipset = nvkm_longopt(device->cfgopt, "NvChipset", 0);
> @@ -3159,12 +3163,7 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
>                 device->name = device->chip->name;
>
>         if (mmio) {
> -               device->pri = ioremap(mmio_base, mmio_size);
> -               if (!device->pri) {
> -                       nvdev_error(device, "unable to map PRI\n");
> -                       ret = -ENOMEM;
> -                       goto done;
> -               }
> +               device->pri = map;
>         }
>
>         mutex_init(&device->mutex);
> @@ -3254,6 +3253,10 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
>
>         ret = 0;
>  done:
> +       if (map && (!mmio || ret)) {
> +               device->pri = NULL;
> +               iounmap(map);
> +       }
>         mutex_unlock(&nv_devices_mutex);
>         return ret;
>  }
> --
> 2.25.3
>
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