nouveau: add an ioctl to return vram bar size.

This returns the BAR resources size so userspace can make
decisions based on rebar support.

userspace using this has been proposed for nvk, but
it's a rather trivial uapi addition.

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouveau/nouveau_abi16.c
index d1bb8151a1df565c44db55432222f09641d7b109..4cb323bc32330651ba5d703a5e346332da7fd9d9 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_abi16.c
+++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c
@@ -199,6 +199,7 @@ nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
        struct nouveau_cli *cli = nouveau_cli(file_priv);
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nvif_device *device = &drm->client.device;
+       struct nvkm_device *nvkm_device = nvxx_device(&drm->client.device);
        struct nvkm_gr *gr = nvxx_gr(device);
        struct drm_nouveau_getparam *getparam = data;
        struct pci_dev *pdev = to_pci_dev(dev->dev);
@@ -263,6 +264,9 @@ nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
                getparam->value = nouveau_exec_push_max_from_ib_max(ib_max);
                break;
        }
+       case NOUVEAU_GETPARAM_VRAM_BAR_SIZE:
+               getparam->value = nvkm_device->func->resource_size(nvkm_device, 1);
+               break;
        default:
                NV_PRINTK(dbg, cli, "unknown parameter %lld\n", getparam->param);
                return -EINVAL;

diff --git a/include/uapi/drm/nouveau_drm.h b/include/uapi/drm/nouveau_drm.h
index 0bade1592f34f21690eab41de48595d7aaa24fe4..10a917639d8d3fd54c48de109106f06172d35375 100644 (file)
--- a/include/uapi/drm/nouveau_drm.h
+++ b/include/uapi/drm/nouveau_drm.h
@@ -54,6 +54,13 @@ extern "C" {
  */
 #define NOUVEAU_GETPARAM_EXEC_PUSH_MAX   17
 
+/*
+ * NOUVEAU_GETPARAM_VRAM_BAR_SIZE - query bar size
+ *
+ * Query the VRAM BAR size.
+ */
+#define NOUVEAU_GETPARAM_VRAM_BAR_SIZE 18
+
 struct drm_nouveau_getparam {
        __u64 param;
        __u64 value;