thr3ads.net - Nouveau - [Nouveau] [PATCH v3 1/3] device: rework mmio mapping code to get rid of second map [Apr 2020]

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Karol Herbst

2020-Apr-28 16:54 UTC

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

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

Karol Herbst

2020-Apr-28 16:54 UTC

head link

[Nouveau] [PATCH v3 2/3] device: detect if changing endianness failed

v2: relax the checks a little

Signed-off-by: Karol Herbst <kherbst at redhat.com>
---
 drm/nouveau/nvkm/engine/device/base.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drm/nouveau/nvkm/engine/device/base.c
b/drm/nouveau/nvkm/engine/device/base.c
index 37589f365..c732074bf 100644
--- a/drm/nouveau/nvkm/engine/device/base.c
+++ b/drm/nouveau/nvkm/engine/device/base.c
@@ -2924,6 +2924,20 @@ nvkm_device_del(struct nvkm_device **pdevice)
 	}
 }
 
+static inline bool
+nvkm_device_endianness(void __iomem *pri)
+{
+	u32 boot1 = ioread32_native(pri + 0x000004) & 0x01000001;
+#ifdef __BIG_ENDIAN
+	if (!boot1)
+		return false;
+#else
+	if (boot1)
+		return false;
+#endif
+	return true;
+}
+
 int
 nvkm_device_ctor(const struct nvkm_device_func *func,
 		 const struct nvkm_device_quirk *quirk,
@@ -2973,13 +2987,15 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
 	/* 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) {
-#else
-		if (ioread32_native(map + 0x000004) == 0x00000000) {
-#endif
+		if (!nvkm_device_endianness(map)) {
 			iowrite32_native(0x01000001, map + 0x000004);
 			ioread32_native(map);
+			if (!nvkm_device_endianness(map)) {
+				nvdev_error(device,
+					    "GPU not supported on big-endian\n");
+				ret = -ENOSYS;
+				goto done;
+			}
 		}
 
 		/* read boot0 and strapping information */
-- 
2.25.3

Karol Herbst

2020-Apr-28 16:54 UTC

head link

[Nouveau] [PATCH v3 3/3] device: detect vGPUs

Using ENODEV as this prevents probe failed errors in dmesg.

v2: move check further down

Signed-off-by: Karol Herbst <kherbst at redhat.com>
---
 drm/nouveau/nvkm/engine/device/base.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drm/nouveau/nvkm/engine/device/base.c
b/drm/nouveau/nvkm/engine/device/base.c
index c732074bf..f977dddcd 100644
--- a/drm/nouveau/nvkm/engine/device/base.c
+++ b/drm/nouveau/nvkm/engine/device/base.c
@@ -2948,7 +2948,7 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
 {
 	struct nvkm_subdev *subdev;
 	u64 mmio_base, mmio_size;
-	u32 boot0, strap;
+	u32 boot0, boot1, strap;
 	void __iomem *map = NULL;
 	int ret = -EEXIST, i;
 	unsigned chipset;
@@ -2998,9 +2998,7 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
 			}
 		}
 
-		/* read boot0 and strapping information */
 		boot0 = ioread32_native(map + 0x000000);
-		strap = ioread32_native(map + 0x101000);
 
 		/* chipset can be overridden for devel/testing purposes */
 		chipset = nvkm_longopt(device->cfgopt, "NvChipset", 0);
@@ -3158,6 +3156,17 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
 		nvdev_info(device, "NVIDIA %s (%08x)\n",
 			   device->chip->name, boot0);
 
+		/* vGPU detection */
+		boot1 = ioread32_native(map + 0x000004);
+		if (device->card_type >= TU100 && (boot1 & 0x00030000)) {
+			nvdev_info(device, "vGPUs are not supported\n");
+			ret = -ENODEV;
+			goto done;
+		}
+
+		/* read strapping information */
+		strap = ioread32_native(map + 0x101000);
+
 		/* determine frequency of timing crystal */
 		if ( device->card_type <= NV_10 || device->chipset < 0x17 ||
 		    (device->chipset >= 0x20 && device->chipset < 0x25))
-- 
2.25.3

Ben Skeggs

2020-Apr-30 04:10 UTC

head link

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

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
>
> _______________________________________________
> Nouveau mailing list
> Nouveau at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau

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