Nouveau - Aug 2025 - [PATCH 0/3] Various minor fixes to Nouveau

Three minor fixes to Nouveau, discovered while working on Nova.

Timur Tabi (3):
  drm/nouveau: fix error path in nvkm_gsp_fwsec_v2
  drm/nouveau: remove unused increment in gm200_flcn_pio_imem_wr
  drm/nouveau: remove unused memory target test

 drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c     | 15 ++++-----------
 drivers/gpu/drm/nouveau/nvkm/subdev/gsp/fwsec.c |  5 +++--
 2 files changed, 7 insertions(+), 13 deletions(-)


base-commit: 6531a2cf07ef156956840853692755cc7e1621b7
-- 
2.43.0

Function nvkm_gsp_fwsec_v2() sets 'ret' if the kmemdup() call fails, but
it never uses or returns 'ret' after that point.  We always need to
release
the firmware regardless, so do that and then check for error.

Fixes: 176fdcbddfd2 ("drm/nouveau/gsp/r535: add support for booting
GSP-RM")
Signed-off-by: Timur Tabi <ttabi at nvidia.com>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/gsp/fwsec.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/fwsec.c
b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/fwsec.c
index 52412965fac1..5b721bd9d799 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/fwsec.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/fwsec.c
@@ -209,11 +209,12 @@ nvkm_gsp_fwsec_v2(struct nvkm_gsp *gsp, const char *name,
 	fw->boot_addr = bld->start_tag << 8;
 	fw->boot_size = bld->code_size;
 	fw->boot = kmemdup(bl->data + hdr->data_offset + bld->code_off,
fw->boot_size, GFP_KERNEL);
-	if (!fw->boot)
-		ret = -ENOMEM;
 
 	nvkm_firmware_put(bl);
 
+	if (!fw->boot)
+		return -ENOMEM;
+
 	/* Patch in interface data. */
 	return nvkm_gsp_fwsec_patch(gsp, fw, desc->InterfaceOffset, init_cmd);
 }
-- 
2.43.0

The 'tag' parameter is passed by value and is not actually used after
being incremented, so remove the increment.  It's the function that calls
gm200_flcn_pio_imem_wr that is supposed to (and does) increment 'tag'.

Signed-off-by: Timur Tabi <ttabi at nvidia.com>
---
 drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
b/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
index b7da3ab44c27..6a004c6e6742 100644
--- a/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
@@ -103,7 +103,7 @@ gm200_flcn_pio_imem_wr_init(struct nvkm_falcon *falcon, u8
port, bool sec, u32 i
 static void
 gm200_flcn_pio_imem_wr(struct nvkm_falcon *falcon, u8 port, const u8 *img, int
len, u16 tag)
 {
-	nvkm_falcon_wr32(falcon, 0x188 + (port * 0x10), tag++);
+	nvkm_falcon_wr32(falcon, 0x188 + (port * 0x10), tag);
 	while (len >= 4) {
 		nvkm_falcon_wr32(falcon, 0x184 + (port * 0x10), *(u32 *)img);
 		img += 4;
-- 
2.43.0

The memory target check is a hold-over from a refactor.  It's harmless
but distracting, so just remove it.

Signed-off-by: Timur Tabi <ttabi at nvidia.com>
---
 drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
b/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
index 6a004c6e6742..7c43397c19e6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c
@@ -249,9 +249,11 @@ int
 gm200_flcn_fw_load(struct nvkm_falcon_fw *fw)
 {
 	struct nvkm_falcon *falcon = fw->falcon;
-	int target, ret;
+	int ret;
 
 	if (fw->inst) {
+		int target;
+
 		nvkm_falcon_mask(falcon, 0x048, 0x00000001, 0x00000001);
 
 		switch (nvkm_memory_target(fw->inst)) {
@@ -285,15 +287,6 @@ gm200_flcn_fw_load(struct nvkm_falcon_fw *fw)
 	}
 
 	if (fw->boot) {
-		switch (nvkm_memory_target(&fw->fw.mem.memory)) {
-		case NVKM_MEM_TARGET_VRAM: target = 4; break;
-		case NVKM_MEM_TARGET_HOST: target = 5; break;
-		case NVKM_MEM_TARGET_NCOH: target = 6; break;
-		default:
-			WARN_ON(1);
-			return -EINVAL;
-		}
-
 		ret = nvkm_falcon_pio_wr(falcon, fw->boot, 0, 0,
 					 IMEM, falcon->code.limit - fw->boot_size, fw->boot_size,
 					 fw->boot_addr >> 8, false);
-- 
2.43.0

On 8/4/25 9:25 PM, Timur Tabi wrote:
> Three minor fixes to Nouveau, discovered while working on Nova.
Thanks for this series!
> Timur Tabi (3):
>    drm/nouveau: fix error path in nvkm_gsp_fwsec_v2
>    drm/nouveau: remove unused increment in gm200_flcn_pio_imem_wr
>    drm/nouveau: remove unused memory target test
Please also add a Fixes tag for the last two patches.