[Nouveau] [PATCH 1/6] gr: support for NVIDIA-provided firmwares

[Alexandre Courbot]

NVIDIA will officially start providing signed firmwares through
linux-firmware. Change the GR firmware lookup function to look them up
in addition to the extracted firmwares.

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
---
 drm/nouveau/nvkm/engine/gr/gf100.c | 66 +++++++++++++++++++++++++++++---------
 1 file changed, 51 insertions(+), 15 deletions(-)

diff --git a/drm/nouveau/nvkm/engine/gr/gf100.c b/drm/nouveau/nvkm/engine/gr/gf100.c
index ca11ddb..39d482f 100644
--- a/drm/nouveau/nvkm/engine/gr/gf100.c
+++ b/drm/nouveau/nvkm/engine/gr/gf100.c
@@ -1544,26 +1544,62 @@ gf100_gr_dtor_fw(struct gf100_gr_fuc *fuc)
 	fuc->data = NULL;
 }
 
+/**
+ * gf100_gr_ctor_fw - helper for loading external GR firmwares
+ *
+ * A firmware can either be officially provided by NVIDIA (in which case it will
+ * use a "NVIDIA name", or be extracted from the binary blob (and use a
+ * "Nouveau name". The fwname and nvfwname are to be given the Nouveau and
+ * NVIDIA names of a given firmware, respectively. This function will then
+ * try to load the NVIDIA firmware, then the extracted one, in that order.
+ *
+ */
 int
 gf100_gr_ctor_fw(struct gf100_gr_priv *priv, const char *fwname,
-		 struct gf100_gr_fuc *fuc)
+		 const char *nvfwname, struct gf100_gr_fuc *fuc)
 {
 	struct nvkm_device *device = nv_device(priv);
 	const struct firmware *fw;
-	char f[32];
-	int ret;
+	char f[64];
+	int ret = -EINVAL;
+	int i;
 
-	snprintf(f, sizeof(f), "nouveau/nv%02x_%s", device->chipset, fwname);
-	ret = request_firmware(&fw, f, nv_device_base(device));
-	if (ret) {
-		snprintf(f, sizeof(f), "nouveau/%s", fwname);
-		ret = request_firmware(&fw, f, nv_device_base(device));
-		if (ret) {
-			nv_error(priv, "failed to load %s\n", fwname);
-			return ret;
+	/*
+	 * NVIDIA firmware name provided - try to load it
+	 * We try this first since most chips that require external firmware
+	 * are supported by NVIDIA
+	 */
+	if (nvfwname) {
+		snprintf(f, sizeof(f), "nvidia/%s/%s.bin", device->cname,
+			 nvfwname);
+		i = strlen(f);
+		while (i) {
+			--i;
+			f[i] = tolower(f[i]);
 		}
+		ret = request_firmware_direct(&fw, f, nv_device_base(device));
+		if (!ret)
+			goto found;
+	}
+
+	/* Nouveau firmware name provided - try to load it */
+	if (fwname) {
+		snprintf(f, sizeof(f), "nouveau/nv%02x_%s", device->chipset,
+			 fwname);
+		ret = request_firmware_direct(&fw, f, nv_device_base(device));
+		if (!ret)
+			goto found;
+
+		snprintf(f, sizeof(f), "nouveau/%s", fwname);
+		ret = request_firmware_direct(&fw, f, nv_device_base(device));
+		if (!ret)
+			goto found;
 	}
 
+	nv_error(priv, "failed to load %s / %s\n", fwname, nvfwname);
+	return ret;
+
+found:
 	fuc->size = fw->size;
 	fuc->data = kmemdup(fw->data, fuc->size, GFP_KERNEL);
 	release_firmware(fw);
@@ -1615,10 +1651,10 @@ gf100_gr_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 
 	if (use_ext_fw) {
 		nv_info(priv, "using external firmware\n");
-		if (gf100_gr_ctor_fw(priv, "fuc409c", &priv->fuc409c) ||
-		    gf100_gr_ctor_fw(priv, "fuc409d", &priv->fuc409d) ||
-		    gf100_gr_ctor_fw(priv, "fuc41ac", &priv->fuc41ac) ||
-		    gf100_gr_ctor_fw(priv, "fuc41ad", &priv->fuc41ad))
+		if (gf100_gr_ctor_fw(priv, "fuc409c", "fecs_inst", &priv->fuc409c) ||
+		    gf100_gr_ctor_fw(priv, "fuc409d", "fecs_data", &priv->fuc409d) ||
+		    gf100_gr_ctor_fw(priv, "fuc41ac", "gpccs_inst", &priv->fuc41ac) ||
+		    gf100_gr_ctor_fw(priv, "fuc41ad", "gpccs_data", &priv->fuc41ad))
 			return -ENODEV;
 		priv->firmware = true;
 	}
-- 
2.4.3