diff mbox

[RFC] drm/nouveau: split off nvc0 compilation

Message ID 1392424686-9828-1-git-send-email-imirkin@alum.mit.edu (mailing list archive)
State New, archived
Headers show

Commit Message

Ilia Mirkin Feb. 15, 2014, 12:38 a.m. UTC 
So... I was wondering what the impact of splitting up the card compilation by
e.g. generation would be. Depending on the split things would get fairly
intertwined, so I thought I'd start small. This just splits NVC0 from
everything else. I figure that for the people this matters the most to, NVC0
is the least relevant card -- people with sub-1GB of RAM, older hardware.

With my config options and everything compiled, the total size of nouveau.ko
is 1343324 bytes (incl symbols), which is split up

   text    data     bss     dec     hex filename
 579171  184264     480  763915   ba80b ./drivers/gpu/drm/nouveau/nouveau.ko

Turning off nvc0+ gives us 995667 bytes, split up

   text    data     bss     dec     hex filename
 472244   59528     480  532252   81f1c ./drivers/gpu/drm/nouveau/nouveau.ko

So we lost 100K of text and 130K of data (probably all that pgraph fw), and
the remaining 100K must be symbols. (I'm not stripping because nobody in their
right mind strips these kernel modules.)

The impact to the code is pretty minor. Depending on the situation it's easier
to either ifdef out code or to provide stubs for functions.

What do people think about this? It shouldn't be too difficult for me to
extend this to categories like <pre-nv50> <nv50-nvc0> <nvc0-nve0> <nve0+>, or
maybe even more fine-grained, esp since nvd0 is when a lot of changes
happened. Or maybe less-fine-grained and keep the nvc0/nve0 cards under one
option.

Feedback appreciated.

Not-Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>

---

 drivers/gpu/drm/nouveau/Kconfig                   |  11 +-
 drivers/gpu/drm/nouveau/Makefile                  | 136 +++++++++++-----------
 drivers/gpu/drm/nouveau/core/engine/device/base.c |   2 +
 drivers/gpu/drm/nouveau/nouveau_drm.c             |   4 +-
 drivers/gpu/drm/nouveau/nouveau_fbcon.h           |  16 +++
 5 files changed, 98 insertions(+), 71 deletions(-)

Comments

Ilia Mirkin Feb. 15, 2014, 2:32 a.m. UTC | #1 
On Fri, Feb 14, 2014 at 7:38 PM, Ilia Mirkin <imirkin@alum.mit.edu> wrote:
> So... I was wondering what the impact of splitting up the card compilation by
> e.g. generation would be. Depending on the split things would get fairly
> intertwined, so I thought I'd start small. This just splits NVC0 from
> everything else. I figure that for the people this matters the most to, NVC0
> is the least relevant card -- people with sub-1GB of RAM, older hardware.
>
> With my config options and everything compiled, the total size of nouveau.ko
> is 1343324 bytes (incl symbols), which is split up
>
>    text    data     bss     dec     hex filename
>  579171  184264     480  763915   ba80b ./drivers/gpu/drm/nouveau/nouveau.ko
>
> Turning off nvc0+ gives us 995667 bytes, split up
>
>    text    data     bss     dec     hex filename
>  472244   59528     480  532252   81f1c ./drivers/gpu/drm/nouveau/nouveau.ko
>
> So we lost 100K of text and 130K of data (probably all that pgraph fw), and
> the remaining 100K must be symbols. (I'm not stripping because nobody in their
> right mind strips these kernel modules.)

In a local patch that also lops off pre-nv50 cards (with one small
problem that involves moving a function somewhere -- seems like
nouveau_crtc_set_config is defined in dispnv04 but used outside of it
-- which I haven't done yet) the module size goes down to 721366,
split up as:

   text    data     bss     dec     hex filename
 346212   34727     480  381419   5d1eb ./drivers/gpu/drm/nouveau/nouveau.ko

So another 130K of text, 26K of data, and 130K in symbols (?). I
didn't have to do anything too dirty, with the mild exception of the
device/base.c file which had that giant if statement, which will have
to be done a bit more cleverly now to not end up as a maze. My final
exercise will be to try to lop off nv50 as well, making the driver
~useless, but still interesting as it would allow one to only compile
one of the 3 categories (or any combo).

>
> The impact to the code is pretty minor. Depending on the situation it's easier
> to either ifdef out code or to provide stubs for functions.
>
> What do people think about this? It shouldn't be too difficult for me to
> extend this to categories like <pre-nv50> <nv50-nvc0> <nvc0-nve0> <nve0+>, or
> maybe even more fine-grained, esp since nvd0 is when a lot of changes
> happened. Or maybe less-fine-grained and keep the nvc0/nve0 cards under one
> option.
>
> Feedback appreciated.
>
> Not-Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
>
> ---
>
>  drivers/gpu/drm/nouveau/Kconfig                   |  11 +-
>  drivers/gpu/drm/nouveau/Makefile                  | 136 +++++++++++-----------
>  drivers/gpu/drm/nouveau/core/engine/device/base.c |   2 +
>  drivers/gpu/drm/nouveau/nouveau_drm.c             |   4 +-
>  drivers/gpu/drm/nouveau/nouveau_fbcon.h           |  16 +++
>  5 files changed, 98 insertions(+), 71 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
> index 7cf787d..927fc38 100644
> --- a/drivers/gpu/drm/nouveau/Kconfig
> +++ b/drivers/gpu/drm/nouveau/Kconfig
> @@ -26,9 +26,14 @@ config DRM_NOUVEAU
>         help
>           Choose this option for open-source nVidia support.
>
> +if DRM_NOUVEAU
> +
> +config DRM_NOUVEAU_NVC0
> +       bool "NVC0+ (Fermi / Kepler)"
> +       default y
> +
>  config NOUVEAU_DEBUG
>         int "Maximum debug level"
> -       depends on DRM_NOUVEAU
>         range 0 7
>         default 5
>         help
> @@ -48,7 +53,6 @@ config NOUVEAU_DEBUG
>
>  config NOUVEAU_DEBUG_DEFAULT
>         int "Default debug level"
> -       depends on DRM_NOUVEAU
>         range 0 7
>         default 3
>         help
> @@ -56,8 +60,9 @@ config NOUVEAU_DEBUG_DEFAULT
>
>  config DRM_NOUVEAU_BACKLIGHT
>         bool "Support for backlight control"
> -       depends on DRM_NOUVEAU
>         default y
>         help
>           Say Y here if you want to control the backlight of your display
>           (e.g. a laptop panel).
> +
> +endif
> diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
> index d310c19..a1e8513 100644
> --- a/drivers/gpu/drm/nouveau/Makefile
> +++ b/drivers/gpu/drm/nouveau/Makefile
> @@ -25,7 +25,7 @@ nouveau-y += core/core/subdev.o
>
>  nouveau-y += core/subdev/bar/base.o
>  nouveau-y += core/subdev/bar/nv50.o
> -nouveau-y += core/subdev/bar/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bar/nvc0.o
>  nouveau-y += core/subdev/bios/base.o
>  nouveau-y += core/subdev/bios/bit.o
>  nouveau-y += core/subdev/bios/boost.o
> @@ -53,7 +53,7 @@ nouveau-y += core/subdev/bus/nv04.o
>  nouveau-y += core/subdev/bus/nv31.o
>  nouveau-y += core/subdev/bus/nv50.o
>  nouveau-y += core/subdev/bus/nv94.o
> -nouveau-y += core/subdev/bus/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bus/nvc0.o
>  nouveau-y += core/subdev/clock/base.o
>  nouveau-y += core/subdev/clock/nv04.o
>  nouveau-y += core/subdev/clock/nv40.o
> @@ -61,8 +61,8 @@ nouveau-y += core/subdev/clock/nv50.o
>  nouveau-y += core/subdev/clock/nv84.o
>  nouveau-y += core/subdev/clock/nva3.o
>  nouveau-y += core/subdev/clock/nvaa.o
> -nouveau-y += core/subdev/clock/nvc0.o
> -nouveau-y += core/subdev/clock/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nve0.o
>  nouveau-y += core/subdev/clock/pllnv04.o
>  nouveau-y += core/subdev/clock/pllnva3.o
>  nouveau-y += core/subdev/devinit/base.o
> @@ -76,7 +76,7 @@ nouveau-y += core/subdev/devinit/nv84.o
>  nouveau-y += core/subdev/devinit/nv98.o
>  nouveau-y += core/subdev/devinit/nva3.o
>  nouveau-y += core/subdev/devinit/nvaf.o
> -nouveau-y += core/subdev/devinit/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/devinit/nvc0.o
>  nouveau-y += core/subdev/fb/base.o
>  nouveau-y += core/subdev/fb/nv04.o
>  nouveau-y += core/subdev/fb/nv10.o
> @@ -98,8 +98,8 @@ nouveau-y += core/subdev/fb/nv84.o
>  nouveau-y += core/subdev/fb/nva3.o
>  nouveau-y += core/subdev/fb/nvaa.o
>  nouveau-y += core/subdev/fb/nvaf.o
> -nouveau-y += core/subdev/fb/nvc0.o
> -nouveau-y += core/subdev/fb/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nve0.o
>  nouveau-y += core/subdev/fb/ramnv04.o
>  nouveau-y += core/subdev/fb/ramnv10.o
>  nouveau-y += core/subdev/fb/ramnv1a.o
> @@ -112,15 +112,15 @@ nouveau-y += core/subdev/fb/ramnv4e.o
>  nouveau-y += core/subdev/fb/ramnv50.o
>  nouveau-y += core/subdev/fb/ramnva3.o
>  nouveau-y += core/subdev/fb/ramnvaa.o
> -nouveau-y += core/subdev/fb/ramnvc0.o
> -nouveau-y += core/subdev/fb/ramnve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnve0.o
>  nouveau-y += core/subdev/fb/sddr3.o
>  nouveau-y += core/subdev/fb/gddr5.o
>  nouveau-y += core/subdev/gpio/base.o
>  nouveau-y += core/subdev/gpio/nv10.o
>  nouveau-y += core/subdev/gpio/nv50.o
> -nouveau-y += core/subdev/gpio/nvd0.o
> -nouveau-y += core/subdev/gpio/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nve0.o
>  nouveau-y += core/subdev/i2c/base.o
>  nouveau-y += core/subdev/i2c/anx9805.o
>  nouveau-y += core/subdev/i2c/aux.o
> @@ -129,14 +129,14 @@ nouveau-y += core/subdev/i2c/nv04.o
>  nouveau-y += core/subdev/i2c/nv4e.o
>  nouveau-y += core/subdev/i2c/nv50.o
>  nouveau-y += core/subdev/i2c/nv94.o
> -nouveau-y += core/subdev/i2c/nvd0.o
> -nouveau-y += core/subdev/ibus/nvc0.o
> -nouveau-y += core/subdev/ibus/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/i2c/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nve0.o
>  nouveau-y += core/subdev/instmem/base.o
>  nouveau-y += core/subdev/instmem/nv04.o
>  nouveau-y += core/subdev/instmem/nv40.o
>  nouveau-y += core/subdev/instmem/nv50.o
> -nouveau-y += core/subdev/ltcg/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ltcg/nvc0.o
>  nouveau-y += core/subdev/mc/base.o
>  nouveau-y += core/subdev/mc/nv04.o
>  nouveau-y += core/subdev/mc/nv40.o
> @@ -145,17 +145,17 @@ nouveau-y += core/subdev/mc/nv4c.o
>  nouveau-y += core/subdev/mc/nv50.o
>  nouveau-y += core/subdev/mc/nv94.o
>  nouveau-y += core/subdev/mc/nv98.o
> -nouveau-y += core/subdev/mc/nvc0.o
> -nouveau-y += core/subdev/mc/nvc3.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc3.o
>  nouveau-y += core/subdev/mxm/base.o
>  nouveau-y += core/subdev/mxm/mxms.o
>  nouveau-y += core/subdev/mxm/nv50.o
>  nouveau-y += core/subdev/pwr/base.o
>  nouveau-y += core/subdev/pwr/memx.o
>  nouveau-y += core/subdev/pwr/nva3.o
> -nouveau-y += core/subdev/pwr/nvc0.o
> -nouveau-y += core/subdev/pwr/nvd0.o
> -nouveau-y += core/subdev/pwr/nv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nv108.o
>  nouveau-y += core/subdev/therm/base.o
>  nouveau-y += core/subdev/therm/fan.o
>  nouveau-y += core/subdev/therm/fannil.o
> @@ -167,7 +167,7 @@ nouveau-y += core/subdev/therm/nv40.o
>  nouveau-y += core/subdev/therm/nv50.o
>  nouveau-y += core/subdev/therm/nv84.o
>  nouveau-y += core/subdev/therm/nva3.o
> -nouveau-y += core/subdev/therm/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/therm/nvd0.o
>  nouveau-y += core/subdev/timer/base.o
>  nouveau-y += core/subdev/timer/nv04.o
>  nouveau-y += core/subdev/vm/base.o
> @@ -175,7 +175,7 @@ nouveau-y += core/subdev/vm/nv04.o
>  nouveau-y += core/subdev/vm/nv41.o
>  nouveau-y += core/subdev/vm/nv44.o
>  nouveau-y += core/subdev/vm/nv50.o
> -nouveau-y += core/subdev/vm/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/vm/nvc0.o
>  nouveau-y += core/subdev/volt/base.o
>  nouveau-y += core/subdev/volt/gpio.o
>  nouveau-y += core/subdev/volt/nv40.o
> @@ -185,15 +185,15 @@ nouveau-y += core/engine/xtensa.o
>  nouveau-y += core/engine/dmaobj/base.o
>  nouveau-y += core/engine/dmaobj/nv04.o
>  nouveau-y += core/engine/dmaobj/nv50.o
> -nouveau-y += core/engine/dmaobj/nvc0.o
> -nouveau-y += core/engine/dmaobj/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvd0.o
>  nouveau-y += core/engine/bsp/nv84.o
>  nouveau-y += core/engine/bsp/nv98.o
> -nouveau-y += core/engine/bsp/nvc0.o
> -nouveau-y += core/engine/bsp/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nve0.o
>  nouveau-y += core/engine/copy/nva3.o
> -nouveau-y += core/engine/copy/nvc0.o
> -nouveau-y += core/engine/copy/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nve0.o
>  nouveau-y += core/engine/crypt/nv84.o
>  nouveau-y += core/engine/crypt/nv98.o
>  nouveau-y += core/engine/device/base.o
> @@ -204,8 +204,8 @@ nouveau-y += core/engine/device/nv20.o
>  nouveau-y += core/engine/device/nv30.o
>  nouveau-y += core/engine/device/nv40.o
>  nouveau-y += core/engine/device/nv50.o
> -nouveau-y += core/engine/device/nvc0.o
> -nouveau-y += core/engine/device/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nve0.o
>  nouveau-y += core/engine/disp/base.o
>  nouveau-y += core/engine/disp/nv04.o
>  nouveau-y += core/engine/disp/nv50.o
> @@ -213,20 +213,20 @@ nouveau-y += core/engine/disp/nv84.o
>  nouveau-y += core/engine/disp/nv94.o
>  nouveau-y += core/engine/disp/nva0.o
>  nouveau-y += core/engine/disp/nva3.o
> -nouveau-y += core/engine/disp/nvd0.o
> -nouveau-y += core/engine/disp/nve0.o
> -nouveau-y += core/engine/disp/nvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvf0.o
>  nouveau-y += core/engine/disp/dacnv50.o
>  nouveau-y += core/engine/disp/dport.o
>  nouveau-y += core/engine/disp/hdanva3.o
> -nouveau-y += core/engine/disp/hdanvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdanvd0.o
>  nouveau-y += core/engine/disp/hdminv84.o
>  nouveau-y += core/engine/disp/hdminva3.o
> -nouveau-y += core/engine/disp/hdminvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdminvd0.o
>  nouveau-y += core/engine/disp/piornv50.o
>  nouveau-y += core/engine/disp/sornv50.o
>  nouveau-y += core/engine/disp/sornv94.o
> -nouveau-y += core/engine/disp/sornvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/sornvd0.o
>  nouveau-y += core/engine/disp/vga.o
>  nouveau-y += core/engine/fifo/base.o
>  nouveau-y += core/engine/fifo/nv04.o
> @@ -235,20 +235,20 @@ nouveau-y += core/engine/fifo/nv17.o
>  nouveau-y += core/engine/fifo/nv40.o
>  nouveau-y += core/engine/fifo/nv50.o
>  nouveau-y += core/engine/fifo/nv84.o
> -nouveau-y += core/engine/fifo/nvc0.o
> -nouveau-y += core/engine/fifo/nve0.o
> -nouveau-y += core/engine/fifo/nv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nv108.o
>  nouveau-y += core/engine/graph/ctxnv40.o
>  nouveau-y += core/engine/graph/ctxnv50.o
> -nouveau-y += core/engine/graph/ctxnvc0.o
> -nouveau-y += core/engine/graph/ctxnvc1.o
> -nouveau-y += core/engine/graph/ctxnvc3.o
> -nouveau-y += core/engine/graph/ctxnvc8.o
> -nouveau-y += core/engine/graph/ctxnvd7.o
> -nouveau-y += core/engine/graph/ctxnvd9.o
> -nouveau-y += core/engine/graph/ctxnve4.o
> -nouveau-y += core/engine/graph/ctxnvf0.o
> -nouveau-y += core/engine/graph/ctxnv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc1.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc3.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc8.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd7.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd9.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnve4.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnv108.o
>  nouveau-y += core/engine/graph/nv04.o
>  nouveau-y += core/engine/graph/nv10.o
>  nouveau-y += core/engine/graph/nv20.o
> @@ -259,15 +259,15 @@ nouveau-y += core/engine/graph/nv34.o
>  nouveau-y += core/engine/graph/nv35.o
>  nouveau-y += core/engine/graph/nv40.o
>  nouveau-y += core/engine/graph/nv50.o
> -nouveau-y += core/engine/graph/nvc0.o
> -nouveau-y += core/engine/graph/nvc1.o
> -nouveau-y += core/engine/graph/nvc3.o
> -nouveau-y += core/engine/graph/nvc8.o
> -nouveau-y += core/engine/graph/nvd7.o
> -nouveau-y += core/engine/graph/nvd9.o
> -nouveau-y += core/engine/graph/nve4.o
> -nouveau-y += core/engine/graph/nvf0.o
> -nouveau-y += core/engine/graph/nv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc1.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc3.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc8.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd7.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd9.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nve4.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nv108.o
>  nouveau-y += core/engine/mpeg/nv31.o
>  nouveau-y += core/engine/mpeg/nv40.o
>  nouveau-y += core/engine/mpeg/nv44.o
> @@ -279,19 +279,19 @@ nouveau-y += core/engine/perfmon/nv40.o
>  nouveau-y += core/engine/perfmon/nv50.o
>  nouveau-y += core/engine/perfmon/nv84.o
>  nouveau-y += core/engine/perfmon/nva3.o
> -nouveau-y += core/engine/perfmon/nvc0.o
> -nouveau-y += core/engine/perfmon/nve0.o
> -nouveau-y += core/engine/perfmon/nvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvf0.o
>  nouveau-y += core/engine/ppp/nv98.o
> -nouveau-y += core/engine/ppp/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/ppp/nvc0.o
>  nouveau-y += core/engine/software/nv04.o
>  nouveau-y += core/engine/software/nv10.o
>  nouveau-y += core/engine/software/nv50.o
> -nouveau-y += core/engine/software/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/software/nvc0.o
>  nouveau-y += core/engine/vp/nv84.o
>  nouveau-y += core/engine/vp/nv98.o
> -nouveau-y += core/engine/vp/nvc0.o
> -nouveau-y += core/engine/vp/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nve0.o
>
>  # drm/core
>  nouveau-y += nouveau_drm.o nouveau_chan.o nouveau_dma.o nouveau_fence.o
> @@ -299,12 +299,14 @@ nouveau-y += nouveau_vga.o nouveau_agp.o
>  nouveau-y += nouveau_ttm.o nouveau_sgdma.o nouveau_bo.o nouveau_gem.o
>  nouveau-y += nouveau_prime.o nouveau_abi16.o
>  nouveau-y += nv04_fence.o nv10_fence.o nv17_fence.o
> -nouveau-y += nv50_fence.o nv84_fence.o nvc0_fence.o
> +nouveau-y += nv50_fence.o nv84_fence.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fence.o
>
>  # drm/kms
>  nouveau-y += nouveau_bios.o nouveau_fbcon.o nouveau_display.o
>  nouveau-y += nouveau_connector.o nouveau_dp.o
> -nouveau-y += nv04_fbcon.o nv50_fbcon.o nvc0_fbcon.o
> +nouveau-y += nv04_fbcon.o nv50_fbcon.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fbcon.o
>
>  # drm/kms/nv04:nv50
>  include $(src)/dispnv04/Makefile
> @@ -323,4 +325,4 @@ endif
>  nouveau-$(CONFIG_DRM_NOUVEAU_BACKLIGHT) += nouveau_backlight.o
>  nouveau-$(CONFIG_DEBUG_FS) += nouveau_debugfs.o
>
> -obj-$(CONFIG_DRM_NOUVEAU)+= nouveau.o
> +obj-$(CONFIG_DRM_NOUVEAU) += nouveau.o
> diff --git a/drivers/gpu/drm/nouveau/core/engine/device/base.c b/drivers/gpu/drm/nouveau/core/engine/device/base.c
> index dd01c6c..c66953b 100644
> --- a/drivers/gpu/drm/nouveau/core/engine/device/base.c
> +++ b/drivers/gpu/drm/nouveau/core/engine/device/base.c
> @@ -205,9 +205,11 @@ nouveau_devobj_ctor(struct nouveau_object *parent,
>                 case NV_30: ret = nv30_identify(device); break;
>                 case NV_40: ret = nv40_identify(device); break;
>                 case NV_50: ret = nv50_identify(device); break;
> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>                 case NV_C0:
>                 case NV_D0: ret = nvc0_identify(device); break;
>                 case NV_E0: ret = nve0_identify(device); break;
> +#endif
>                 default:
>                         ret = -EINVAL;
>                         break;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index 9c9ce4d..875c6a0 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -138,7 +138,7 @@ nouveau_accel_init(struct nouveau_drm *drm)
>         struct nouveau_device *device = nv_device(drm->device);
>         struct nouveau_object *object;
>         u32 arg0, arg1;
> -       int ret;
> +       int ret = -ENODEV;
>
>         if (nouveau_noaccel || !nouveau_fifo(device) /*XXX*/)
>                 return;
> @@ -150,7 +150,9 @@ nouveau_accel_init(struct nouveau_drm *drm)
>         else if (device->card_type < NV_50) ret = nv17_fence_create(drm);
>         else if (device->chipset   <  0x84) ret = nv50_fence_create(drm);
>         else if (device->card_type < NV_C0) ret = nv84_fence_create(drm);
> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>         else                                ret = nvc0_fence_create(drm);
> +#endif
>         if (ret) {
>                 NV_ERROR(drm, "failed to initialise sync subsystem, %d\n", ret);
>                 nouveau_accel_fini(drm);
> diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.h b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
> index fdfc0c9..b4ff8d5 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_fbcon.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
> @@ -51,10 +51,26 @@ int nv50_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
>  int nv50_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
>  int nv50_fbcon_accel_init(struct fb_info *info);
>
> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>  int nvc0_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
>  int nvc0_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
>  int nvc0_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
>  int nvc0_fbcon_accel_init(struct fb_info *info);
> +#else
> +#define _STUB(name, type) \
> +static inline int name(struct fb_info *info, const struct type *t) \
> +{ \
> +       return -ENODEV; \
> +}
> +_STUB(nvc0_fbcon_fillrect, fb_fillrect)
> +_STUB(nvc0_fbcon_copyarea, fb_copyarea)
> +_STUB(nvc0_fbcon_imageblit, fb_image)
> +#undef _STUB
> +static inline int nvc0_fbcon_accel_init(struct fb_info *info)
> +{
> +       return -ENODEV;
> +}
> +#endif
>
>  void nouveau_fbcon_gpu_lockup(struct fb_info *info);
>
> --
> 1.8.3.2
>
Ilia Mirkin Feb. 15, 2014, 4:14 a.m. UTC | #2 
On Fri, Feb 14, 2014 at 9:32 PM, Ilia Mirkin <imirkin@alum.mit.edu> wrote:
> On Fri, Feb 14, 2014 at 7:38 PM, Ilia Mirkin <imirkin@alum.mit.edu> wrote:
>> So... I was wondering what the impact of splitting up the card compilation by
>> e.g. generation would be. Depending on the split things would get fairly
>> intertwined, so I thought I'd start small. This just splits NVC0 from
>> everything else. I figure that for the people this matters the most to, NVC0
>> is the least relevant card -- people with sub-1GB of RAM, older hardware.
>>
>> With my config options and everything compiled, the total size of nouveau.ko
>> is 1343324 bytes (incl symbols), which is split up
>>
>>    text    data     bss     dec     hex filename
>>  579171  184264     480  763915   ba80b ./drivers/gpu/drm/nouveau/nouveau.ko
>>
>> Turning off nvc0+ gives us 995667 bytes, split up
>>
>>    text    data     bss     dec     hex filename
>>  472244   59528     480  532252   81f1c ./drivers/gpu/drm/nouveau/nouveau.ko
>>
>> So we lost 100K of text and 130K of data (probably all that pgraph fw), and
>> the remaining 100K must be symbols. (I'm not stripping because nobody in their
>> right mind strips these kernel modules.)
>
> In a local patch that also lops off pre-nv50 cards (with one small
> problem that involves moving a function somewhere -- seems like
> nouveau_crtc_set_config is defined in dispnv04 but used outside of it
> -- which I haven't done yet) the module size goes down to 721366,
> split up as:
>
>    text    data     bss     dec     hex filename
>  346212   34727     480  381419   5d1eb ./drivers/gpu/drm/nouveau/nouveau.ko
>
> So another 130K of text, 26K of data, and 130K in symbols (?). I
> didn't have to do anything too dirty, with the mild exception of the
> device/base.c file which had that giant if statement, which will have
> to be done a bit more cleverly now to not end up as a maze. My final
> exercise will be to try to lop off nv50 as well, making the driver
> ~useless, but still interesting as it would allow one to only compile
> one of the 3 categories (or any combo).

Here's some further size info:

Nothing: 416118 bytes
   text    data     bss     dec     hex filename
 198669    9525      80  208274   32d92 drivers/gpu/drm/nouveau/nouveau.ko

NV04: 710270 bytes
   text    data     bss     dec     hex filename
 333755   35094     160  369009   5a171 drivers/gpu/drm/nouveau/nouveau.ko

NV50: 722079 bytes
   text    data     bss     dec     hex filename
 346476   34727     480  381683   5d2f3 drivers/gpu/drm/nouveau/nouveau.ko

NVC0: 878726 bytes
   text    data     bss     dec     hex filename
 360593  140327      80  501000   7a508 drivers/gpu/drm/nouveau/nouveau.ko

NV04 + NV50: 995817 bytes
   text    data     bss     dec     hex filename
 472244   59528     480  532252   81f1c drivers/gpu/drm/nouveau/nouveau.ko

NV04 + NVC0: 1167727 bytes
   text    data     bss     dec     hex filename
 493567  165704     160  659431   a0fe7 drivers/gpu/drm/nouveau/nouveau.ko

NV50 + NVC0: 1070110 bytes
   text    data     bss     dec     hex filename
 453459  159463     480  613402   95c1a drivers/gpu/drm/nouveau/nouveau.ko

NV04 + NV50 + NVC0: 1343482 bytes
   text    data     bss     dec     hex filename
 579171  184264     480  763915   ba80b drivers/gpu/drm/nouveau/nouveau.ko

The final patch that does all this is not much dirtier than this
patch, just more changes to the Makefile. I'll hold off on sending it
out though, awaiting some feedback on whether people think this is
useful and/or should be done differently.

>
>>
>> The impact to the code is pretty minor. Depending on the situation it's easier
>> to either ifdef out code or to provide stubs for functions.
>>
>> What do people think about this? It shouldn't be too difficult for me to
>> extend this to categories like <pre-nv50> <nv50-nvc0> <nvc0-nve0> <nve0+>, or
>> maybe even more fine-grained, esp since nvd0 is when a lot of changes
>> happened. Or maybe less-fine-grained and keep the nvc0/nve0 cards under one
>> option.
>>
>> Feedback appreciated.
>>
>> Not-Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
>>
>> ---
>>
>>  drivers/gpu/drm/nouveau/Kconfig                   |  11 +-
>>  drivers/gpu/drm/nouveau/Makefile                  | 136 +++++++++++-----------
>>  drivers/gpu/drm/nouveau/core/engine/device/base.c |   2 +
>>  drivers/gpu/drm/nouveau/nouveau_drm.c             |   4 +-
>>  drivers/gpu/drm/nouveau/nouveau_fbcon.h           |  16 +++
>>  5 files changed, 98 insertions(+), 71 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
>> index 7cf787d..927fc38 100644
>> --- a/drivers/gpu/drm/nouveau/Kconfig
>> +++ b/drivers/gpu/drm/nouveau/Kconfig
>> @@ -26,9 +26,14 @@ config DRM_NOUVEAU
>>         help
>>           Choose this option for open-source nVidia support.
>>
>> +if DRM_NOUVEAU
>> +
>> +config DRM_NOUVEAU_NVC0
>> +       bool "NVC0+ (Fermi / Kepler)"
>> +       default y
>> +
>>  config NOUVEAU_DEBUG
>>         int "Maximum debug level"
>> -       depends on DRM_NOUVEAU
>>         range 0 7
>>         default 5
>>         help
>> @@ -48,7 +53,6 @@ config NOUVEAU_DEBUG
>>
>>  config NOUVEAU_DEBUG_DEFAULT
>>         int "Default debug level"
>> -       depends on DRM_NOUVEAU
>>         range 0 7
>>         default 3
>>         help
>> @@ -56,8 +60,9 @@ config NOUVEAU_DEBUG_DEFAULT
>>
>>  config DRM_NOUVEAU_BACKLIGHT
>>         bool "Support for backlight control"
>> -       depends on DRM_NOUVEAU
>>         default y
>>         help
>>           Say Y here if you want to control the backlight of your display
>>           (e.g. a laptop panel).
>> +
>> +endif
>> diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
>> index d310c19..a1e8513 100644
>> --- a/drivers/gpu/drm/nouveau/Makefile
>> +++ b/drivers/gpu/drm/nouveau/Makefile
>> @@ -25,7 +25,7 @@ nouveau-y += core/core/subdev.o
>>
>>  nouveau-y += core/subdev/bar/base.o
>>  nouveau-y += core/subdev/bar/nv50.o
>> -nouveau-y += core/subdev/bar/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bar/nvc0.o
>>  nouveau-y += core/subdev/bios/base.o
>>  nouveau-y += core/subdev/bios/bit.o
>>  nouveau-y += core/subdev/bios/boost.o
>> @@ -53,7 +53,7 @@ nouveau-y += core/subdev/bus/nv04.o
>>  nouveau-y += core/subdev/bus/nv31.o
>>  nouveau-y += core/subdev/bus/nv50.o
>>  nouveau-y += core/subdev/bus/nv94.o
>> -nouveau-y += core/subdev/bus/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bus/nvc0.o
>>  nouveau-y += core/subdev/clock/base.o
>>  nouveau-y += core/subdev/clock/nv04.o
>>  nouveau-y += core/subdev/clock/nv40.o
>> @@ -61,8 +61,8 @@ nouveau-y += core/subdev/clock/nv50.o
>>  nouveau-y += core/subdev/clock/nv84.o
>>  nouveau-y += core/subdev/clock/nva3.o
>>  nouveau-y += core/subdev/clock/nvaa.o
>> -nouveau-y += core/subdev/clock/nvc0.o
>> -nouveau-y += core/subdev/clock/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nve0.o
>>  nouveau-y += core/subdev/clock/pllnv04.o
>>  nouveau-y += core/subdev/clock/pllnva3.o
>>  nouveau-y += core/subdev/devinit/base.o
>> @@ -76,7 +76,7 @@ nouveau-y += core/subdev/devinit/nv84.o
>>  nouveau-y += core/subdev/devinit/nv98.o
>>  nouveau-y += core/subdev/devinit/nva3.o
>>  nouveau-y += core/subdev/devinit/nvaf.o
>> -nouveau-y += core/subdev/devinit/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/devinit/nvc0.o
>>  nouveau-y += core/subdev/fb/base.o
>>  nouveau-y += core/subdev/fb/nv04.o
>>  nouveau-y += core/subdev/fb/nv10.o
>> @@ -98,8 +98,8 @@ nouveau-y += core/subdev/fb/nv84.o
>>  nouveau-y += core/subdev/fb/nva3.o
>>  nouveau-y += core/subdev/fb/nvaa.o
>>  nouveau-y += core/subdev/fb/nvaf.o
>> -nouveau-y += core/subdev/fb/nvc0.o
>> -nouveau-y += core/subdev/fb/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nve0.o
>>  nouveau-y += core/subdev/fb/ramnv04.o
>>  nouveau-y += core/subdev/fb/ramnv10.o
>>  nouveau-y += core/subdev/fb/ramnv1a.o
>> @@ -112,15 +112,15 @@ nouveau-y += core/subdev/fb/ramnv4e.o
>>  nouveau-y += core/subdev/fb/ramnv50.o
>>  nouveau-y += core/subdev/fb/ramnva3.o
>>  nouveau-y += core/subdev/fb/ramnvaa.o
>> -nouveau-y += core/subdev/fb/ramnvc0.o
>> -nouveau-y += core/subdev/fb/ramnve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnve0.o
>>  nouveau-y += core/subdev/fb/sddr3.o
>>  nouveau-y += core/subdev/fb/gddr5.o
>>  nouveau-y += core/subdev/gpio/base.o
>>  nouveau-y += core/subdev/gpio/nv10.o
>>  nouveau-y += core/subdev/gpio/nv50.o
>> -nouveau-y += core/subdev/gpio/nvd0.o
>> -nouveau-y += core/subdev/gpio/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nve0.o
>>  nouveau-y += core/subdev/i2c/base.o
>>  nouveau-y += core/subdev/i2c/anx9805.o
>>  nouveau-y += core/subdev/i2c/aux.o
>> @@ -129,14 +129,14 @@ nouveau-y += core/subdev/i2c/nv04.o
>>  nouveau-y += core/subdev/i2c/nv4e.o
>>  nouveau-y += core/subdev/i2c/nv50.o
>>  nouveau-y += core/subdev/i2c/nv94.o
>> -nouveau-y += core/subdev/i2c/nvd0.o
>> -nouveau-y += core/subdev/ibus/nvc0.o
>> -nouveau-y += core/subdev/ibus/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/i2c/nvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nve0.o
>>  nouveau-y += core/subdev/instmem/base.o
>>  nouveau-y += core/subdev/instmem/nv04.o
>>  nouveau-y += core/subdev/instmem/nv40.o
>>  nouveau-y += core/subdev/instmem/nv50.o
>> -nouveau-y += core/subdev/ltcg/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ltcg/nvc0.o
>>  nouveau-y += core/subdev/mc/base.o
>>  nouveau-y += core/subdev/mc/nv04.o
>>  nouveau-y += core/subdev/mc/nv40.o
>> @@ -145,17 +145,17 @@ nouveau-y += core/subdev/mc/nv4c.o
>>  nouveau-y += core/subdev/mc/nv50.o
>>  nouveau-y += core/subdev/mc/nv94.o
>>  nouveau-y += core/subdev/mc/nv98.o
>> -nouveau-y += core/subdev/mc/nvc0.o
>> -nouveau-y += core/subdev/mc/nvc3.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc3.o
>>  nouveau-y += core/subdev/mxm/base.o
>>  nouveau-y += core/subdev/mxm/mxms.o
>>  nouveau-y += core/subdev/mxm/nv50.o
>>  nouveau-y += core/subdev/pwr/base.o
>>  nouveau-y += core/subdev/pwr/memx.o
>>  nouveau-y += core/subdev/pwr/nva3.o
>> -nouveau-y += core/subdev/pwr/nvc0.o
>> -nouveau-y += core/subdev/pwr/nvd0.o
>> -nouveau-y += core/subdev/pwr/nv108.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nv108.o
>>  nouveau-y += core/subdev/therm/base.o
>>  nouveau-y += core/subdev/therm/fan.o
>>  nouveau-y += core/subdev/therm/fannil.o
>> @@ -167,7 +167,7 @@ nouveau-y += core/subdev/therm/nv40.o
>>  nouveau-y += core/subdev/therm/nv50.o
>>  nouveau-y += core/subdev/therm/nv84.o
>>  nouveau-y += core/subdev/therm/nva3.o
>> -nouveau-y += core/subdev/therm/nvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/therm/nvd0.o
>>  nouveau-y += core/subdev/timer/base.o
>>  nouveau-y += core/subdev/timer/nv04.o
>>  nouveau-y += core/subdev/vm/base.o
>> @@ -175,7 +175,7 @@ nouveau-y += core/subdev/vm/nv04.o
>>  nouveau-y += core/subdev/vm/nv41.o
>>  nouveau-y += core/subdev/vm/nv44.o
>>  nouveau-y += core/subdev/vm/nv50.o
>> -nouveau-y += core/subdev/vm/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/vm/nvc0.o
>>  nouveau-y += core/subdev/volt/base.o
>>  nouveau-y += core/subdev/volt/gpio.o
>>  nouveau-y += core/subdev/volt/nv40.o
>> @@ -185,15 +185,15 @@ nouveau-y += core/engine/xtensa.o
>>  nouveau-y += core/engine/dmaobj/base.o
>>  nouveau-y += core/engine/dmaobj/nv04.o
>>  nouveau-y += core/engine/dmaobj/nv50.o
>> -nouveau-y += core/engine/dmaobj/nvc0.o
>> -nouveau-y += core/engine/dmaobj/nvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvd0.o
>>  nouveau-y += core/engine/bsp/nv84.o
>>  nouveau-y += core/engine/bsp/nv98.o
>> -nouveau-y += core/engine/bsp/nvc0.o
>> -nouveau-y += core/engine/bsp/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nve0.o
>>  nouveau-y += core/engine/copy/nva3.o
>> -nouveau-y += core/engine/copy/nvc0.o
>> -nouveau-y += core/engine/copy/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nve0.o
>>  nouveau-y += core/engine/crypt/nv84.o
>>  nouveau-y += core/engine/crypt/nv98.o
>>  nouveau-y += core/engine/device/base.o
>> @@ -204,8 +204,8 @@ nouveau-y += core/engine/device/nv20.o
>>  nouveau-y += core/engine/device/nv30.o
>>  nouveau-y += core/engine/device/nv40.o
>>  nouveau-y += core/engine/device/nv50.o
>> -nouveau-y += core/engine/device/nvc0.o
>> -nouveau-y += core/engine/device/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nve0.o
>>  nouveau-y += core/engine/disp/base.o
>>  nouveau-y += core/engine/disp/nv04.o
>>  nouveau-y += core/engine/disp/nv50.o
>> @@ -213,20 +213,20 @@ nouveau-y += core/engine/disp/nv84.o
>>  nouveau-y += core/engine/disp/nv94.o
>>  nouveau-y += core/engine/disp/nva0.o
>>  nouveau-y += core/engine/disp/nva3.o
>> -nouveau-y += core/engine/disp/nvd0.o
>> -nouveau-y += core/engine/disp/nve0.o
>> -nouveau-y += core/engine/disp/nvf0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvf0.o
>>  nouveau-y += core/engine/disp/dacnv50.o
>>  nouveau-y += core/engine/disp/dport.o
>>  nouveau-y += core/engine/disp/hdanva3.o
>> -nouveau-y += core/engine/disp/hdanvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdanvd0.o
>>  nouveau-y += core/engine/disp/hdminv84.o
>>  nouveau-y += core/engine/disp/hdminva3.o
>> -nouveau-y += core/engine/disp/hdminvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdminvd0.o
>>  nouveau-y += core/engine/disp/piornv50.o
>>  nouveau-y += core/engine/disp/sornv50.o
>>  nouveau-y += core/engine/disp/sornv94.o
>> -nouveau-y += core/engine/disp/sornvd0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/sornvd0.o
>>  nouveau-y += core/engine/disp/vga.o
>>  nouveau-y += core/engine/fifo/base.o
>>  nouveau-y += core/engine/fifo/nv04.o
>> @@ -235,20 +235,20 @@ nouveau-y += core/engine/fifo/nv17.o
>>  nouveau-y += core/engine/fifo/nv40.o
>>  nouveau-y += core/engine/fifo/nv50.o
>>  nouveau-y += core/engine/fifo/nv84.o
>> -nouveau-y += core/engine/fifo/nvc0.o
>> -nouveau-y += core/engine/fifo/nve0.o
>> -nouveau-y += core/engine/fifo/nv108.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nv108.o
>>  nouveau-y += core/engine/graph/ctxnv40.o
>>  nouveau-y += core/engine/graph/ctxnv50.o
>> -nouveau-y += core/engine/graph/ctxnvc0.o
>> -nouveau-y += core/engine/graph/ctxnvc1.o
>> -nouveau-y += core/engine/graph/ctxnvc3.o
>> -nouveau-y += core/engine/graph/ctxnvc8.o
>> -nouveau-y += core/engine/graph/ctxnvd7.o
>> -nouveau-y += core/engine/graph/ctxnvd9.o
>> -nouveau-y += core/engine/graph/ctxnve4.o
>> -nouveau-y += core/engine/graph/ctxnvf0.o
>> -nouveau-y += core/engine/graph/ctxnv108.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc1.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc3.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc8.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd7.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd9.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnve4.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvf0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnv108.o
>>  nouveau-y += core/engine/graph/nv04.o
>>  nouveau-y += core/engine/graph/nv10.o
>>  nouveau-y += core/engine/graph/nv20.o
>> @@ -259,15 +259,15 @@ nouveau-y += core/engine/graph/nv34.o
>>  nouveau-y += core/engine/graph/nv35.o
>>  nouveau-y += core/engine/graph/nv40.o
>>  nouveau-y += core/engine/graph/nv50.o
>> -nouveau-y += core/engine/graph/nvc0.o
>> -nouveau-y += core/engine/graph/nvc1.o
>> -nouveau-y += core/engine/graph/nvc3.o
>> -nouveau-y += core/engine/graph/nvc8.o
>> -nouveau-y += core/engine/graph/nvd7.o
>> -nouveau-y += core/engine/graph/nvd9.o
>> -nouveau-y += core/engine/graph/nve4.o
>> -nouveau-y += core/engine/graph/nvf0.o
>> -nouveau-y += core/engine/graph/nv108.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc1.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc3.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc8.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd7.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd9.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nve4.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvf0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nv108.o
>>  nouveau-y += core/engine/mpeg/nv31.o
>>  nouveau-y += core/engine/mpeg/nv40.o
>>  nouveau-y += core/engine/mpeg/nv44.o
>> @@ -279,19 +279,19 @@ nouveau-y += core/engine/perfmon/nv40.o
>>  nouveau-y += core/engine/perfmon/nv50.o
>>  nouveau-y += core/engine/perfmon/nv84.o
>>  nouveau-y += core/engine/perfmon/nva3.o
>> -nouveau-y += core/engine/perfmon/nvc0.o
>> -nouveau-y += core/engine/perfmon/nve0.o
>> -nouveau-y += core/engine/perfmon/nvf0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvf0.o
>>  nouveau-y += core/engine/ppp/nv98.o
>> -nouveau-y += core/engine/ppp/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/ppp/nvc0.o
>>  nouveau-y += core/engine/software/nv04.o
>>  nouveau-y += core/engine/software/nv10.o
>>  nouveau-y += core/engine/software/nv50.o
>> -nouveau-y += core/engine/software/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/software/nvc0.o
>>  nouveau-y += core/engine/vp/nv84.o
>>  nouveau-y += core/engine/vp/nv98.o
>> -nouveau-y += core/engine/vp/nvc0.o
>> -nouveau-y += core/engine/vp/nve0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nvc0.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nve0.o
>>
>>  # drm/core
>>  nouveau-y += nouveau_drm.o nouveau_chan.o nouveau_dma.o nouveau_fence.o
>> @@ -299,12 +299,14 @@ nouveau-y += nouveau_vga.o nouveau_agp.o
>>  nouveau-y += nouveau_ttm.o nouveau_sgdma.o nouveau_bo.o nouveau_gem.o
>>  nouveau-y += nouveau_prime.o nouveau_abi16.o
>>  nouveau-y += nv04_fence.o nv10_fence.o nv17_fence.o
>> -nouveau-y += nv50_fence.o nv84_fence.o nvc0_fence.o
>> +nouveau-y += nv50_fence.o nv84_fence.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fence.o
>>
>>  # drm/kms
>>  nouveau-y += nouveau_bios.o nouveau_fbcon.o nouveau_display.o
>>  nouveau-y += nouveau_connector.o nouveau_dp.o
>> -nouveau-y += nv04_fbcon.o nv50_fbcon.o nvc0_fbcon.o
>> +nouveau-y += nv04_fbcon.o nv50_fbcon.o
>> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fbcon.o
>>
>>  # drm/kms/nv04:nv50
>>  include $(src)/dispnv04/Makefile
>> @@ -323,4 +325,4 @@ endif
>>  nouveau-$(CONFIG_DRM_NOUVEAU_BACKLIGHT) += nouveau_backlight.o
>>  nouveau-$(CONFIG_DEBUG_FS) += nouveau_debugfs.o
>>
>> -obj-$(CONFIG_DRM_NOUVEAU)+= nouveau.o
>> +obj-$(CONFIG_DRM_NOUVEAU) += nouveau.o
>> diff --git a/drivers/gpu/drm/nouveau/core/engine/device/base.c b/drivers/gpu/drm/nouveau/core/engine/device/base.c
>> index dd01c6c..c66953b 100644
>> --- a/drivers/gpu/drm/nouveau/core/engine/device/base.c
>> +++ b/drivers/gpu/drm/nouveau/core/engine/device/base.c
>> @@ -205,9 +205,11 @@ nouveau_devobj_ctor(struct nouveau_object *parent,
>>                 case NV_30: ret = nv30_identify(device); break;
>>                 case NV_40: ret = nv40_identify(device); break;
>>                 case NV_50: ret = nv50_identify(device); break;
>> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>>                 case NV_C0:
>>                 case NV_D0: ret = nvc0_identify(device); break;
>>                 case NV_E0: ret = nve0_identify(device); break;
>> +#endif
>>                 default:
>>                         ret = -EINVAL;
>>                         break;
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
>> index 9c9ce4d..875c6a0 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
>> @@ -138,7 +138,7 @@ nouveau_accel_init(struct nouveau_drm *drm)
>>         struct nouveau_device *device = nv_device(drm->device);
>>         struct nouveau_object *object;
>>         u32 arg0, arg1;
>> -       int ret;
>> +       int ret = -ENODEV;
>>
>>         if (nouveau_noaccel || !nouveau_fifo(device) /*XXX*/)
>>                 return;
>> @@ -150,7 +150,9 @@ nouveau_accel_init(struct nouveau_drm *drm)
>>         else if (device->card_type < NV_50) ret = nv17_fence_create(drm);
>>         else if (device->chipset   <  0x84) ret = nv50_fence_create(drm);
>>         else if (device->card_type < NV_C0) ret = nv84_fence_create(drm);
>> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>>         else                                ret = nvc0_fence_create(drm);
>> +#endif
>>         if (ret) {
>>                 NV_ERROR(drm, "failed to initialise sync subsystem, %d\n", ret);
>>                 nouveau_accel_fini(drm);
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.h b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
>> index fdfc0c9..b4ff8d5 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_fbcon.h
>> +++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
>> @@ -51,10 +51,26 @@ int nv50_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
>>  int nv50_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
>>  int nv50_fbcon_accel_init(struct fb_info *info);
>>
>> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>>  int nvc0_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
>>  int nvc0_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
>>  int nvc0_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
>>  int nvc0_fbcon_accel_init(struct fb_info *info);
>> +#else
>> +#define _STUB(name, type) \
>> +static inline int name(struct fb_info *info, const struct type *t) \
>> +{ \
>> +       return -ENODEV; \
>> +}
>> +_STUB(nvc0_fbcon_fillrect, fb_fillrect)
>> +_STUB(nvc0_fbcon_copyarea, fb_copyarea)
>> +_STUB(nvc0_fbcon_imageblit, fb_image)
>> +#undef _STUB
>> +static inline int nvc0_fbcon_accel_init(struct fb_info *info)
>> +{
>> +       return -ENODEV;
>> +}
>> +#endif
>>
>>  void nouveau_fbcon_gpu_lockup(struct fb_info *info);
>>
>> --
>> 1.8.3.2
>>
Emil Velikov Feb. 15, 2014, 12:57 p.m. UTC | #3 
On 15/02/14 00:38, Ilia Mirkin wrote:
> So... I was wondering what the impact of splitting up the card compilation by
> e.g. generation would be. Depending on the split things would get fairly
> intertwined, so I thought I'd start small. This just splits NVC0 from
> everything else. I figure that for the people this matters the most to, NVC0
> is the least relevant card -- people with sub-1GB of RAM, older hardware.
> 
> With my config options and everything compiled, the total size of nouveau.ko
> is 1343324 bytes (incl symbols), which is split up
> 
>    text    data     bss     dec     hex filename
>  579171  184264     480  763915   ba80b ./drivers/gpu/drm/nouveau/nouveau.ko
> 
> Turning off nvc0+ gives us 995667 bytes, split up
> 
>    text    data     bss     dec     hex filename
>  472244   59528     480  532252   81f1c ./drivers/gpu/drm/nouveau/nouveau.ko
> 
> So we lost 100K of text and 130K of data (probably all that pgraph fw), and
> the remaining 100K must be symbols. (I'm not stripping because nobody in their
> right mind strips these kernel modules.)
> 
> The impact to the code is pretty minor. Depending on the situation it's easier
> to either ifdef out code or to provide stubs for functions.
> 
> What do people think about this? It shouldn't be too difficult for me to
> extend this to categories like <pre-nv50> <nv50-nvc0> <nvc0-nve0> <nve0+>, or
> maybe even more fine-grained, esp since nvd0 is when a lot of changes
> happened. Or maybe less-fine-grained and keep the nvc0/nve0 cards under one
> option.
> 
> Feedback appreciated.
> 
Hmmm there was a user a while back that was requesting this. I wonder if
he is still around :-)

In my POV size is not such a compelling argument, while compilation time
on the other hand is.

Don't get me wrong I like your approach and I'm happy with the idea,
especially how cleanly it integrates with current code.

Just one small note: can you hide the options (perhaps behind
CONFIG_EXPERT) with defaults to "build all". Main idea is to minimise
unaware users tempering and having problems as a result.

Thanks
-Emil

> Not-Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
> 
> ---
> 
>  drivers/gpu/drm/nouveau/Kconfig                   |  11 +-
>  drivers/gpu/drm/nouveau/Makefile                  | 136 +++++++++++-----------
>  drivers/gpu/drm/nouveau/core/engine/device/base.c |   2 +
>  drivers/gpu/drm/nouveau/nouveau_drm.c             |   4 +-
>  drivers/gpu/drm/nouveau/nouveau_fbcon.h           |  16 +++
>  5 files changed, 98 insertions(+), 71 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
> index 7cf787d..927fc38 100644
> --- a/drivers/gpu/drm/nouveau/Kconfig
> +++ b/drivers/gpu/drm/nouveau/Kconfig
> @@ -26,9 +26,14 @@ config DRM_NOUVEAU
>  	help
>  	  Choose this option for open-source nVidia support.
>  
> +if DRM_NOUVEAU
> +
> +config DRM_NOUVEAU_NVC0
> +	bool "NVC0+ (Fermi / Kepler)"
> +	default y
> +
>  config NOUVEAU_DEBUG
>  	int "Maximum debug level"
> -	depends on DRM_NOUVEAU
>  	range 0 7
>  	default 5
>  	help
> @@ -48,7 +53,6 @@ config NOUVEAU_DEBUG
>  
>  config NOUVEAU_DEBUG_DEFAULT
>  	int "Default debug level"
> -	depends on DRM_NOUVEAU
>  	range 0 7
>  	default 3
>  	help
> @@ -56,8 +60,9 @@ config NOUVEAU_DEBUG_DEFAULT
>  
>  config DRM_NOUVEAU_BACKLIGHT
>  	bool "Support for backlight control"
> -	depends on DRM_NOUVEAU
>  	default y
>  	help
>  	  Say Y here if you want to control the backlight of your display
>  	  (e.g. a laptop panel).
> +
> +endif
> diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
> index d310c19..a1e8513 100644
> --- a/drivers/gpu/drm/nouveau/Makefile
> +++ b/drivers/gpu/drm/nouveau/Makefile
> @@ -25,7 +25,7 @@ nouveau-y += core/core/subdev.o
>  
>  nouveau-y += core/subdev/bar/base.o
>  nouveau-y += core/subdev/bar/nv50.o
> -nouveau-y += core/subdev/bar/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bar/nvc0.o
>  nouveau-y += core/subdev/bios/base.o
>  nouveau-y += core/subdev/bios/bit.o
>  nouveau-y += core/subdev/bios/boost.o
> @@ -53,7 +53,7 @@ nouveau-y += core/subdev/bus/nv04.o
>  nouveau-y += core/subdev/bus/nv31.o
>  nouveau-y += core/subdev/bus/nv50.o
>  nouveau-y += core/subdev/bus/nv94.o
> -nouveau-y += core/subdev/bus/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bus/nvc0.o
>  nouveau-y += core/subdev/clock/base.o
>  nouveau-y += core/subdev/clock/nv04.o
>  nouveau-y += core/subdev/clock/nv40.o
> @@ -61,8 +61,8 @@ nouveau-y += core/subdev/clock/nv50.o
>  nouveau-y += core/subdev/clock/nv84.o
>  nouveau-y += core/subdev/clock/nva3.o
>  nouveau-y += core/subdev/clock/nvaa.o
> -nouveau-y += core/subdev/clock/nvc0.o
> -nouveau-y += core/subdev/clock/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nve0.o
>  nouveau-y += core/subdev/clock/pllnv04.o
>  nouveau-y += core/subdev/clock/pllnva3.o
>  nouveau-y += core/subdev/devinit/base.o
> @@ -76,7 +76,7 @@ nouveau-y += core/subdev/devinit/nv84.o
>  nouveau-y += core/subdev/devinit/nv98.o
>  nouveau-y += core/subdev/devinit/nva3.o
>  nouveau-y += core/subdev/devinit/nvaf.o
> -nouveau-y += core/subdev/devinit/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/devinit/nvc0.o
>  nouveau-y += core/subdev/fb/base.o
>  nouveau-y += core/subdev/fb/nv04.o
>  nouveau-y += core/subdev/fb/nv10.o
> @@ -98,8 +98,8 @@ nouveau-y += core/subdev/fb/nv84.o
>  nouveau-y += core/subdev/fb/nva3.o
>  nouveau-y += core/subdev/fb/nvaa.o
>  nouveau-y += core/subdev/fb/nvaf.o
> -nouveau-y += core/subdev/fb/nvc0.o
> -nouveau-y += core/subdev/fb/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nve0.o
>  nouveau-y += core/subdev/fb/ramnv04.o
>  nouveau-y += core/subdev/fb/ramnv10.o
>  nouveau-y += core/subdev/fb/ramnv1a.o
> @@ -112,15 +112,15 @@ nouveau-y += core/subdev/fb/ramnv4e.o
>  nouveau-y += core/subdev/fb/ramnv50.o
>  nouveau-y += core/subdev/fb/ramnva3.o
>  nouveau-y += core/subdev/fb/ramnvaa.o
> -nouveau-y += core/subdev/fb/ramnvc0.o
> -nouveau-y += core/subdev/fb/ramnve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnve0.o
>  nouveau-y += core/subdev/fb/sddr3.o
>  nouveau-y += core/subdev/fb/gddr5.o
>  nouveau-y += core/subdev/gpio/base.o
>  nouveau-y += core/subdev/gpio/nv10.o
>  nouveau-y += core/subdev/gpio/nv50.o
> -nouveau-y += core/subdev/gpio/nvd0.o
> -nouveau-y += core/subdev/gpio/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nve0.o
>  nouveau-y += core/subdev/i2c/base.o
>  nouveau-y += core/subdev/i2c/anx9805.o
>  nouveau-y += core/subdev/i2c/aux.o
> @@ -129,14 +129,14 @@ nouveau-y += core/subdev/i2c/nv04.o
>  nouveau-y += core/subdev/i2c/nv4e.o
>  nouveau-y += core/subdev/i2c/nv50.o
>  nouveau-y += core/subdev/i2c/nv94.o
> -nouveau-y += core/subdev/i2c/nvd0.o
> -nouveau-y += core/subdev/ibus/nvc0.o
> -nouveau-y += core/subdev/ibus/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/i2c/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nve0.o
>  nouveau-y += core/subdev/instmem/base.o
>  nouveau-y += core/subdev/instmem/nv04.o
>  nouveau-y += core/subdev/instmem/nv40.o
>  nouveau-y += core/subdev/instmem/nv50.o
> -nouveau-y += core/subdev/ltcg/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ltcg/nvc0.o
>  nouveau-y += core/subdev/mc/base.o
>  nouveau-y += core/subdev/mc/nv04.o
>  nouveau-y += core/subdev/mc/nv40.o
> @@ -145,17 +145,17 @@ nouveau-y += core/subdev/mc/nv4c.o
>  nouveau-y += core/subdev/mc/nv50.o
>  nouveau-y += core/subdev/mc/nv94.o
>  nouveau-y += core/subdev/mc/nv98.o
> -nouveau-y += core/subdev/mc/nvc0.o
> -nouveau-y += core/subdev/mc/nvc3.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc3.o
>  nouveau-y += core/subdev/mxm/base.o
>  nouveau-y += core/subdev/mxm/mxms.o
>  nouveau-y += core/subdev/mxm/nv50.o
>  nouveau-y += core/subdev/pwr/base.o
>  nouveau-y += core/subdev/pwr/memx.o
>  nouveau-y += core/subdev/pwr/nva3.o
> -nouveau-y += core/subdev/pwr/nvc0.o
> -nouveau-y += core/subdev/pwr/nvd0.o
> -nouveau-y += core/subdev/pwr/nv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nv108.o
>  nouveau-y += core/subdev/therm/base.o
>  nouveau-y += core/subdev/therm/fan.o
>  nouveau-y += core/subdev/therm/fannil.o
> @@ -167,7 +167,7 @@ nouveau-y += core/subdev/therm/nv40.o
>  nouveau-y += core/subdev/therm/nv50.o
>  nouveau-y += core/subdev/therm/nv84.o
>  nouveau-y += core/subdev/therm/nva3.o
> -nouveau-y += core/subdev/therm/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/therm/nvd0.o
>  nouveau-y += core/subdev/timer/base.o
>  nouveau-y += core/subdev/timer/nv04.o
>  nouveau-y += core/subdev/vm/base.o
> @@ -175,7 +175,7 @@ nouveau-y += core/subdev/vm/nv04.o
>  nouveau-y += core/subdev/vm/nv41.o
>  nouveau-y += core/subdev/vm/nv44.o
>  nouveau-y += core/subdev/vm/nv50.o
> -nouveau-y += core/subdev/vm/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/vm/nvc0.o
>  nouveau-y += core/subdev/volt/base.o
>  nouveau-y += core/subdev/volt/gpio.o
>  nouveau-y += core/subdev/volt/nv40.o
> @@ -185,15 +185,15 @@ nouveau-y += core/engine/xtensa.o
>  nouveau-y += core/engine/dmaobj/base.o
>  nouveau-y += core/engine/dmaobj/nv04.o
>  nouveau-y += core/engine/dmaobj/nv50.o
> -nouveau-y += core/engine/dmaobj/nvc0.o
> -nouveau-y += core/engine/dmaobj/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvd0.o
>  nouveau-y += core/engine/bsp/nv84.o
>  nouveau-y += core/engine/bsp/nv98.o
> -nouveau-y += core/engine/bsp/nvc0.o
> -nouveau-y += core/engine/bsp/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nve0.o
>  nouveau-y += core/engine/copy/nva3.o
> -nouveau-y += core/engine/copy/nvc0.o
> -nouveau-y += core/engine/copy/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nve0.o
>  nouveau-y += core/engine/crypt/nv84.o
>  nouveau-y += core/engine/crypt/nv98.o
>  nouveau-y += core/engine/device/base.o
> @@ -204,8 +204,8 @@ nouveau-y += core/engine/device/nv20.o
>  nouveau-y += core/engine/device/nv30.o
>  nouveau-y += core/engine/device/nv40.o
>  nouveau-y += core/engine/device/nv50.o
> -nouveau-y += core/engine/device/nvc0.o
> -nouveau-y += core/engine/device/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nve0.o
>  nouveau-y += core/engine/disp/base.o
>  nouveau-y += core/engine/disp/nv04.o
>  nouveau-y += core/engine/disp/nv50.o
> @@ -213,20 +213,20 @@ nouveau-y += core/engine/disp/nv84.o
>  nouveau-y += core/engine/disp/nv94.o
>  nouveau-y += core/engine/disp/nva0.o
>  nouveau-y += core/engine/disp/nva3.o
> -nouveau-y += core/engine/disp/nvd0.o
> -nouveau-y += core/engine/disp/nve0.o
> -nouveau-y += core/engine/disp/nvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvf0.o
>  nouveau-y += core/engine/disp/dacnv50.o
>  nouveau-y += core/engine/disp/dport.o
>  nouveau-y += core/engine/disp/hdanva3.o
> -nouveau-y += core/engine/disp/hdanvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdanvd0.o
>  nouveau-y += core/engine/disp/hdminv84.o
>  nouveau-y += core/engine/disp/hdminva3.o
> -nouveau-y += core/engine/disp/hdminvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdminvd0.o
>  nouveau-y += core/engine/disp/piornv50.o
>  nouveau-y += core/engine/disp/sornv50.o
>  nouveau-y += core/engine/disp/sornv94.o
> -nouveau-y += core/engine/disp/sornvd0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/sornvd0.o
>  nouveau-y += core/engine/disp/vga.o
>  nouveau-y += core/engine/fifo/base.o
>  nouveau-y += core/engine/fifo/nv04.o
> @@ -235,20 +235,20 @@ nouveau-y += core/engine/fifo/nv17.o
>  nouveau-y += core/engine/fifo/nv40.o
>  nouveau-y += core/engine/fifo/nv50.o
>  nouveau-y += core/engine/fifo/nv84.o
> -nouveau-y += core/engine/fifo/nvc0.o
> -nouveau-y += core/engine/fifo/nve0.o
> -nouveau-y += core/engine/fifo/nv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nv108.o
>  nouveau-y += core/engine/graph/ctxnv40.o
>  nouveau-y += core/engine/graph/ctxnv50.o
> -nouveau-y += core/engine/graph/ctxnvc0.o
> -nouveau-y += core/engine/graph/ctxnvc1.o
> -nouveau-y += core/engine/graph/ctxnvc3.o
> -nouveau-y += core/engine/graph/ctxnvc8.o
> -nouveau-y += core/engine/graph/ctxnvd7.o
> -nouveau-y += core/engine/graph/ctxnvd9.o
> -nouveau-y += core/engine/graph/ctxnve4.o
> -nouveau-y += core/engine/graph/ctxnvf0.o
> -nouveau-y += core/engine/graph/ctxnv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc1.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc3.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc8.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd7.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd9.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnve4.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnv108.o
>  nouveau-y += core/engine/graph/nv04.o
>  nouveau-y += core/engine/graph/nv10.o
>  nouveau-y += core/engine/graph/nv20.o
> @@ -259,15 +259,15 @@ nouveau-y += core/engine/graph/nv34.o
>  nouveau-y += core/engine/graph/nv35.o
>  nouveau-y += core/engine/graph/nv40.o
>  nouveau-y += core/engine/graph/nv50.o
> -nouveau-y += core/engine/graph/nvc0.o
> -nouveau-y += core/engine/graph/nvc1.o
> -nouveau-y += core/engine/graph/nvc3.o
> -nouveau-y += core/engine/graph/nvc8.o
> -nouveau-y += core/engine/graph/nvd7.o
> -nouveau-y += core/engine/graph/nvd9.o
> -nouveau-y += core/engine/graph/nve4.o
> -nouveau-y += core/engine/graph/nvf0.o
> -nouveau-y += core/engine/graph/nv108.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc1.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc3.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc8.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd7.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd9.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nve4.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nv108.o
>  nouveau-y += core/engine/mpeg/nv31.o
>  nouveau-y += core/engine/mpeg/nv40.o
>  nouveau-y += core/engine/mpeg/nv44.o
> @@ -279,19 +279,19 @@ nouveau-y += core/engine/perfmon/nv40.o
>  nouveau-y += core/engine/perfmon/nv50.o
>  nouveau-y += core/engine/perfmon/nv84.o
>  nouveau-y += core/engine/perfmon/nva3.o
> -nouveau-y += core/engine/perfmon/nvc0.o
> -nouveau-y += core/engine/perfmon/nve0.o
> -nouveau-y += core/engine/perfmon/nvf0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvf0.o
>  nouveau-y += core/engine/ppp/nv98.o
> -nouveau-y += core/engine/ppp/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/ppp/nvc0.o
>  nouveau-y += core/engine/software/nv04.o
>  nouveau-y += core/engine/software/nv10.o
>  nouveau-y += core/engine/software/nv50.o
> -nouveau-y += core/engine/software/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/software/nvc0.o
>  nouveau-y += core/engine/vp/nv84.o
>  nouveau-y += core/engine/vp/nv98.o
> -nouveau-y += core/engine/vp/nvc0.o
> -nouveau-y += core/engine/vp/nve0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nvc0.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nve0.o
>  
>  # drm/core
>  nouveau-y += nouveau_drm.o nouveau_chan.o nouveau_dma.o nouveau_fence.o
> @@ -299,12 +299,14 @@ nouveau-y += nouveau_vga.o nouveau_agp.o
>  nouveau-y += nouveau_ttm.o nouveau_sgdma.o nouveau_bo.o nouveau_gem.o
>  nouveau-y += nouveau_prime.o nouveau_abi16.o
>  nouveau-y += nv04_fence.o nv10_fence.o nv17_fence.o
> -nouveau-y += nv50_fence.o nv84_fence.o nvc0_fence.o
> +nouveau-y += nv50_fence.o nv84_fence.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fence.o
>  
>  # drm/kms
>  nouveau-y += nouveau_bios.o nouveau_fbcon.o nouveau_display.o
>  nouveau-y += nouveau_connector.o nouveau_dp.o
> -nouveau-y += nv04_fbcon.o nv50_fbcon.o nvc0_fbcon.o
> +nouveau-y += nv04_fbcon.o nv50_fbcon.o
> +nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fbcon.o
>  
>  # drm/kms/nv04:nv50
>  include $(src)/dispnv04/Makefile
> @@ -323,4 +325,4 @@ endif
>  nouveau-$(CONFIG_DRM_NOUVEAU_BACKLIGHT) += nouveau_backlight.o
>  nouveau-$(CONFIG_DEBUG_FS) += nouveau_debugfs.o
>  
> -obj-$(CONFIG_DRM_NOUVEAU)+= nouveau.o
> +obj-$(CONFIG_DRM_NOUVEAU) += nouveau.o
> diff --git a/drivers/gpu/drm/nouveau/core/engine/device/base.c b/drivers/gpu/drm/nouveau/core/engine/device/base.c
> index dd01c6c..c66953b 100644
> --- a/drivers/gpu/drm/nouveau/core/engine/device/base.c
> +++ b/drivers/gpu/drm/nouveau/core/engine/device/base.c
> @@ -205,9 +205,11 @@ nouveau_devobj_ctor(struct nouveau_object *parent,
>  		case NV_30: ret = nv30_identify(device); break;
>  		case NV_40: ret = nv40_identify(device); break;
>  		case NV_50: ret = nv50_identify(device); break;
> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>  		case NV_C0:
>  		case NV_D0: ret = nvc0_identify(device); break;
>  		case NV_E0: ret = nve0_identify(device); break;
> +#endif
>  		default:
>  			ret = -EINVAL;
>  			break;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index 9c9ce4d..875c6a0 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -138,7 +138,7 @@ nouveau_accel_init(struct nouveau_drm *drm)
>  	struct nouveau_device *device = nv_device(drm->device);
>  	struct nouveau_object *object;
>  	u32 arg0, arg1;
> -	int ret;
> +	int ret = -ENODEV;
>  
>  	if (nouveau_noaccel || !nouveau_fifo(device) /*XXX*/)
>  		return;
> @@ -150,7 +150,9 @@ nouveau_accel_init(struct nouveau_drm *drm)
>  	else if (device->card_type < NV_50) ret = nv17_fence_create(drm);
>  	else if (device->chipset   <  0x84) ret = nv50_fence_create(drm);
>  	else if (device->card_type < NV_C0) ret = nv84_fence_create(drm);
> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>  	else                                ret = nvc0_fence_create(drm);
> +#endif
>  	if (ret) {
>  		NV_ERROR(drm, "failed to initialise sync subsystem, %d\n", ret);
>  		nouveau_accel_fini(drm);
> diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.h b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
> index fdfc0c9..b4ff8d5 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_fbcon.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
> @@ -51,10 +51,26 @@ int nv50_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
>  int nv50_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
>  int nv50_fbcon_accel_init(struct fb_info *info);
>  
> +#ifdef CONFIG_DRM_NOUVEAU_NVC0
>  int nvc0_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
>  int nvc0_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
>  int nvc0_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
>  int nvc0_fbcon_accel_init(struct fb_info *info);
> +#else
> +#define _STUB(name, type) \
> +static inline int name(struct fb_info *info, const struct type *t) \
> +{ \
> +	return -ENODEV; \
> +}
> +_STUB(nvc0_fbcon_fillrect, fb_fillrect)
> +_STUB(nvc0_fbcon_copyarea, fb_copyarea)
> +_STUB(nvc0_fbcon_imageblit, fb_image)
> +#undef _STUB
> +static inline int nvc0_fbcon_accel_init(struct fb_info *info)
> +{
> +	return -ENODEV;
> +}
> +#endif
>  
>  void nouveau_fbcon_gpu_lockup(struct fb_info *info);
>  
>
diff mbox

Patch

diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
index 7cf787d..927fc38 100644
--- a/drivers/gpu/drm/nouveau/Kconfig
+++ b/drivers/gpu/drm/nouveau/Kconfig
@@ -26,9 +26,14 @@  config DRM_NOUVEAU
 	help
 	  Choose this option for open-source nVidia support.
 
+if DRM_NOUVEAU
+
+config DRM_NOUVEAU_NVC0
+	bool "NVC0+ (Fermi / Kepler)"
+	default y
+
 config NOUVEAU_DEBUG
 	int "Maximum debug level"
-	depends on DRM_NOUVEAU
 	range 0 7
 	default 5
 	help
@@ -48,7 +53,6 @@  config NOUVEAU_DEBUG
 
 config NOUVEAU_DEBUG_DEFAULT
 	int "Default debug level"
-	depends on DRM_NOUVEAU
 	range 0 7
 	default 3
 	help
@@ -56,8 +60,9 @@  config NOUVEAU_DEBUG_DEFAULT
 
 config DRM_NOUVEAU_BACKLIGHT
 	bool "Support for backlight control"
-	depends on DRM_NOUVEAU
 	default y
 	help
 	  Say Y here if you want to control the backlight of your display
 	  (e.g. a laptop panel).
+
+endif
diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index d310c19..a1e8513 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -25,7 +25,7 @@  nouveau-y += core/core/subdev.o
 
 nouveau-y += core/subdev/bar/base.o
 nouveau-y += core/subdev/bar/nv50.o
-nouveau-y += core/subdev/bar/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bar/nvc0.o
 nouveau-y += core/subdev/bios/base.o
 nouveau-y += core/subdev/bios/bit.o
 nouveau-y += core/subdev/bios/boost.o
@@ -53,7 +53,7 @@  nouveau-y += core/subdev/bus/nv04.o
 nouveau-y += core/subdev/bus/nv31.o
 nouveau-y += core/subdev/bus/nv50.o
 nouveau-y += core/subdev/bus/nv94.o
-nouveau-y += core/subdev/bus/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/bus/nvc0.o
 nouveau-y += core/subdev/clock/base.o
 nouveau-y += core/subdev/clock/nv04.o
 nouveau-y += core/subdev/clock/nv40.o
@@ -61,8 +61,8 @@  nouveau-y += core/subdev/clock/nv50.o
 nouveau-y += core/subdev/clock/nv84.o
 nouveau-y += core/subdev/clock/nva3.o
 nouveau-y += core/subdev/clock/nvaa.o
-nouveau-y += core/subdev/clock/nvc0.o
-nouveau-y += core/subdev/clock/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/clock/nve0.o
 nouveau-y += core/subdev/clock/pllnv04.o
 nouveau-y += core/subdev/clock/pllnva3.o
 nouveau-y += core/subdev/devinit/base.o
@@ -76,7 +76,7 @@  nouveau-y += core/subdev/devinit/nv84.o
 nouveau-y += core/subdev/devinit/nv98.o
 nouveau-y += core/subdev/devinit/nva3.o
 nouveau-y += core/subdev/devinit/nvaf.o
-nouveau-y += core/subdev/devinit/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/devinit/nvc0.o
 nouveau-y += core/subdev/fb/base.o
 nouveau-y += core/subdev/fb/nv04.o
 nouveau-y += core/subdev/fb/nv10.o
@@ -98,8 +98,8 @@  nouveau-y += core/subdev/fb/nv84.o
 nouveau-y += core/subdev/fb/nva3.o
 nouveau-y += core/subdev/fb/nvaa.o
 nouveau-y += core/subdev/fb/nvaf.o
-nouveau-y += core/subdev/fb/nvc0.o
-nouveau-y += core/subdev/fb/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/nve0.o
 nouveau-y += core/subdev/fb/ramnv04.o
 nouveau-y += core/subdev/fb/ramnv10.o
 nouveau-y += core/subdev/fb/ramnv1a.o
@@ -112,15 +112,15 @@  nouveau-y += core/subdev/fb/ramnv4e.o
 nouveau-y += core/subdev/fb/ramnv50.o
 nouveau-y += core/subdev/fb/ramnva3.o
 nouveau-y += core/subdev/fb/ramnvaa.o
-nouveau-y += core/subdev/fb/ramnvc0.o
-nouveau-y += core/subdev/fb/ramnve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/fb/ramnve0.o
 nouveau-y += core/subdev/fb/sddr3.o
 nouveau-y += core/subdev/fb/gddr5.o
 nouveau-y += core/subdev/gpio/base.o
 nouveau-y += core/subdev/gpio/nv10.o
 nouveau-y += core/subdev/gpio/nv50.o
-nouveau-y += core/subdev/gpio/nvd0.o
-nouveau-y += core/subdev/gpio/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/gpio/nve0.o
 nouveau-y += core/subdev/i2c/base.o
 nouveau-y += core/subdev/i2c/anx9805.o
 nouveau-y += core/subdev/i2c/aux.o
@@ -129,14 +129,14 @@  nouveau-y += core/subdev/i2c/nv04.o
 nouveau-y += core/subdev/i2c/nv4e.o
 nouveau-y += core/subdev/i2c/nv50.o
 nouveau-y += core/subdev/i2c/nv94.o
-nouveau-y += core/subdev/i2c/nvd0.o
-nouveau-y += core/subdev/ibus/nvc0.o
-nouveau-y += core/subdev/ibus/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/i2c/nvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ibus/nve0.o
 nouveau-y += core/subdev/instmem/base.o
 nouveau-y += core/subdev/instmem/nv04.o
 nouveau-y += core/subdev/instmem/nv40.o
 nouveau-y += core/subdev/instmem/nv50.o
-nouveau-y += core/subdev/ltcg/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/ltcg/nvc0.o
 nouveau-y += core/subdev/mc/base.o
 nouveau-y += core/subdev/mc/nv04.o
 nouveau-y += core/subdev/mc/nv40.o
@@ -145,17 +145,17 @@  nouveau-y += core/subdev/mc/nv4c.o
 nouveau-y += core/subdev/mc/nv50.o
 nouveau-y += core/subdev/mc/nv94.o
 nouveau-y += core/subdev/mc/nv98.o
-nouveau-y += core/subdev/mc/nvc0.o
-nouveau-y += core/subdev/mc/nvc3.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/mc/nvc3.o
 nouveau-y += core/subdev/mxm/base.o
 nouveau-y += core/subdev/mxm/mxms.o
 nouveau-y += core/subdev/mxm/nv50.o
 nouveau-y += core/subdev/pwr/base.o
 nouveau-y += core/subdev/pwr/memx.o
 nouveau-y += core/subdev/pwr/nva3.o
-nouveau-y += core/subdev/pwr/nvc0.o
-nouveau-y += core/subdev/pwr/nvd0.o
-nouveau-y += core/subdev/pwr/nv108.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/pwr/nv108.o
 nouveau-y += core/subdev/therm/base.o
 nouveau-y += core/subdev/therm/fan.o
 nouveau-y += core/subdev/therm/fannil.o
@@ -167,7 +167,7 @@  nouveau-y += core/subdev/therm/nv40.o
 nouveau-y += core/subdev/therm/nv50.o
 nouveau-y += core/subdev/therm/nv84.o
 nouveau-y += core/subdev/therm/nva3.o
-nouveau-y += core/subdev/therm/nvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/therm/nvd0.o
 nouveau-y += core/subdev/timer/base.o
 nouveau-y += core/subdev/timer/nv04.o
 nouveau-y += core/subdev/vm/base.o
@@ -175,7 +175,7 @@  nouveau-y += core/subdev/vm/nv04.o
 nouveau-y += core/subdev/vm/nv41.o
 nouveau-y += core/subdev/vm/nv44.o
 nouveau-y += core/subdev/vm/nv50.o
-nouveau-y += core/subdev/vm/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/subdev/vm/nvc0.o
 nouveau-y += core/subdev/volt/base.o
 nouveau-y += core/subdev/volt/gpio.o
 nouveau-y += core/subdev/volt/nv40.o
@@ -185,15 +185,15 @@  nouveau-y += core/engine/xtensa.o
 nouveau-y += core/engine/dmaobj/base.o
 nouveau-y += core/engine/dmaobj/nv04.o
 nouveau-y += core/engine/dmaobj/nv50.o
-nouveau-y += core/engine/dmaobj/nvc0.o
-nouveau-y += core/engine/dmaobj/nvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/dmaobj/nvd0.o
 nouveau-y += core/engine/bsp/nv84.o
 nouveau-y += core/engine/bsp/nv98.o
-nouveau-y += core/engine/bsp/nvc0.o
-nouveau-y += core/engine/bsp/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/bsp/nve0.o
 nouveau-y += core/engine/copy/nva3.o
-nouveau-y += core/engine/copy/nvc0.o
-nouveau-y += core/engine/copy/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/copy/nve0.o
 nouveau-y += core/engine/crypt/nv84.o
 nouveau-y += core/engine/crypt/nv98.o
 nouveau-y += core/engine/device/base.o
@@ -204,8 +204,8 @@  nouveau-y += core/engine/device/nv20.o
 nouveau-y += core/engine/device/nv30.o
 nouveau-y += core/engine/device/nv40.o
 nouveau-y += core/engine/device/nv50.o
-nouveau-y += core/engine/device/nvc0.o
-nouveau-y += core/engine/device/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/device/nve0.o
 nouveau-y += core/engine/disp/base.o
 nouveau-y += core/engine/disp/nv04.o
 nouveau-y += core/engine/disp/nv50.o
@@ -213,20 +213,20 @@  nouveau-y += core/engine/disp/nv84.o
 nouveau-y += core/engine/disp/nv94.o
 nouveau-y += core/engine/disp/nva0.o
 nouveau-y += core/engine/disp/nva3.o
-nouveau-y += core/engine/disp/nvd0.o
-nouveau-y += core/engine/disp/nve0.o
-nouveau-y += core/engine/disp/nvf0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/nvf0.o
 nouveau-y += core/engine/disp/dacnv50.o
 nouveau-y += core/engine/disp/dport.o
 nouveau-y += core/engine/disp/hdanva3.o
-nouveau-y += core/engine/disp/hdanvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdanvd0.o
 nouveau-y += core/engine/disp/hdminv84.o
 nouveau-y += core/engine/disp/hdminva3.o
-nouveau-y += core/engine/disp/hdminvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/hdminvd0.o
 nouveau-y += core/engine/disp/piornv50.o
 nouveau-y += core/engine/disp/sornv50.o
 nouveau-y += core/engine/disp/sornv94.o
-nouveau-y += core/engine/disp/sornvd0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/disp/sornvd0.o
 nouveau-y += core/engine/disp/vga.o
 nouveau-y += core/engine/fifo/base.o
 nouveau-y += core/engine/fifo/nv04.o
@@ -235,20 +235,20 @@  nouveau-y += core/engine/fifo/nv17.o
 nouveau-y += core/engine/fifo/nv40.o
 nouveau-y += core/engine/fifo/nv50.o
 nouveau-y += core/engine/fifo/nv84.o
-nouveau-y += core/engine/fifo/nvc0.o
-nouveau-y += core/engine/fifo/nve0.o
-nouveau-y += core/engine/fifo/nv108.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/fifo/nv108.o
 nouveau-y += core/engine/graph/ctxnv40.o
 nouveau-y += core/engine/graph/ctxnv50.o
-nouveau-y += core/engine/graph/ctxnvc0.o
-nouveau-y += core/engine/graph/ctxnvc1.o
-nouveau-y += core/engine/graph/ctxnvc3.o
-nouveau-y += core/engine/graph/ctxnvc8.o
-nouveau-y += core/engine/graph/ctxnvd7.o
-nouveau-y += core/engine/graph/ctxnvd9.o
-nouveau-y += core/engine/graph/ctxnve4.o
-nouveau-y += core/engine/graph/ctxnvf0.o
-nouveau-y += core/engine/graph/ctxnv108.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc1.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc3.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvc8.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd7.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvd9.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnve4.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnvf0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/ctxnv108.o
 nouveau-y += core/engine/graph/nv04.o
 nouveau-y += core/engine/graph/nv10.o
 nouveau-y += core/engine/graph/nv20.o
@@ -259,15 +259,15 @@  nouveau-y += core/engine/graph/nv34.o
 nouveau-y += core/engine/graph/nv35.o
 nouveau-y += core/engine/graph/nv40.o
 nouveau-y += core/engine/graph/nv50.o
-nouveau-y += core/engine/graph/nvc0.o
-nouveau-y += core/engine/graph/nvc1.o
-nouveau-y += core/engine/graph/nvc3.o
-nouveau-y += core/engine/graph/nvc8.o
-nouveau-y += core/engine/graph/nvd7.o
-nouveau-y += core/engine/graph/nvd9.o
-nouveau-y += core/engine/graph/nve4.o
-nouveau-y += core/engine/graph/nvf0.o
-nouveau-y += core/engine/graph/nv108.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc1.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc3.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvc8.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd7.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvd9.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nve4.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nvf0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/graph/nv108.o
 nouveau-y += core/engine/mpeg/nv31.o
 nouveau-y += core/engine/mpeg/nv40.o
 nouveau-y += core/engine/mpeg/nv44.o
@@ -279,19 +279,19 @@  nouveau-y += core/engine/perfmon/nv40.o
 nouveau-y += core/engine/perfmon/nv50.o
 nouveau-y += core/engine/perfmon/nv84.o
 nouveau-y += core/engine/perfmon/nva3.o
-nouveau-y += core/engine/perfmon/nvc0.o
-nouveau-y += core/engine/perfmon/nve0.o
-nouveau-y += core/engine/perfmon/nvf0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/perfmon/nvf0.o
 nouveau-y += core/engine/ppp/nv98.o
-nouveau-y += core/engine/ppp/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/ppp/nvc0.o
 nouveau-y += core/engine/software/nv04.o
 nouveau-y += core/engine/software/nv10.o
 nouveau-y += core/engine/software/nv50.o
-nouveau-y += core/engine/software/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/software/nvc0.o
 nouveau-y += core/engine/vp/nv84.o
 nouveau-y += core/engine/vp/nv98.o
-nouveau-y += core/engine/vp/nvc0.o
-nouveau-y += core/engine/vp/nve0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nvc0.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += core/engine/vp/nve0.o
 
 # drm/core
 nouveau-y += nouveau_drm.o nouveau_chan.o nouveau_dma.o nouveau_fence.o
@@ -299,12 +299,14 @@  nouveau-y += nouveau_vga.o nouveau_agp.o
 nouveau-y += nouveau_ttm.o nouveau_sgdma.o nouveau_bo.o nouveau_gem.o
 nouveau-y += nouveau_prime.o nouveau_abi16.o
 nouveau-y += nv04_fence.o nv10_fence.o nv17_fence.o
-nouveau-y += nv50_fence.o nv84_fence.o nvc0_fence.o
+nouveau-y += nv50_fence.o nv84_fence.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fence.o
 
 # drm/kms
 nouveau-y += nouveau_bios.o nouveau_fbcon.o nouveau_display.o
 nouveau-y += nouveau_connector.o nouveau_dp.o
-nouveau-y += nv04_fbcon.o nv50_fbcon.o nvc0_fbcon.o
+nouveau-y += nv04_fbcon.o nv50_fbcon.o
+nouveau-$(CONFIG_DRM_NOUVEAU_NVC0) += nvc0_fbcon.o
 
 # drm/kms/nv04:nv50
 include $(src)/dispnv04/Makefile
@@ -323,4 +325,4 @@  endif
 nouveau-$(CONFIG_DRM_NOUVEAU_BACKLIGHT) += nouveau_backlight.o
 nouveau-$(CONFIG_DEBUG_FS) += nouveau_debugfs.o
 
-obj-$(CONFIG_DRM_NOUVEAU)+= nouveau.o
+obj-$(CONFIG_DRM_NOUVEAU) += nouveau.o
diff --git a/drivers/gpu/drm/nouveau/core/engine/device/base.c b/drivers/gpu/drm/nouveau/core/engine/device/base.c
index dd01c6c..c66953b 100644
--- a/drivers/gpu/drm/nouveau/core/engine/device/base.c
+++ b/drivers/gpu/drm/nouveau/core/engine/device/base.c
@@ -205,9 +205,11 @@  nouveau_devobj_ctor(struct nouveau_object *parent,
 		case NV_30: ret = nv30_identify(device); break;
 		case NV_40: ret = nv40_identify(device); break;
 		case NV_50: ret = nv50_identify(device); break;
+#ifdef CONFIG_DRM_NOUVEAU_NVC0
 		case NV_C0:
 		case NV_D0: ret = nvc0_identify(device); break;
 		case NV_E0: ret = nve0_identify(device); break;
+#endif
 		default:
 			ret = -EINVAL;
 			break;
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 9c9ce4d..875c6a0 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -138,7 +138,7 @@  nouveau_accel_init(struct nouveau_drm *drm)
 	struct nouveau_device *device = nv_device(drm->device);
 	struct nouveau_object *object;
 	u32 arg0, arg1;
-	int ret;
+	int ret = -ENODEV;
 
 	if (nouveau_noaccel || !nouveau_fifo(device) /*XXX*/)
 		return;
@@ -150,7 +150,9 @@  nouveau_accel_init(struct nouveau_drm *drm)
 	else if (device->card_type < NV_50) ret = nv17_fence_create(drm);
 	else if (device->chipset   <  0x84) ret = nv50_fence_create(drm);
 	else if (device->card_type < NV_C0) ret = nv84_fence_create(drm);
+#ifdef CONFIG_DRM_NOUVEAU_NVC0
 	else                                ret = nvc0_fence_create(drm);
+#endif
 	if (ret) {
 		NV_ERROR(drm, "failed to initialise sync subsystem, %d\n", ret);
 		nouveau_accel_fini(drm);
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.h b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
index fdfc0c9..b4ff8d5 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.h
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.h
@@ -51,10 +51,26 @@  int nv50_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
 int nv50_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
 int nv50_fbcon_accel_init(struct fb_info *info);
 
+#ifdef CONFIG_DRM_NOUVEAU_NVC0
 int nvc0_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
 int nvc0_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region);
 int nvc0_fbcon_imageblit(struct fb_info *info, const struct fb_image *image);
 int nvc0_fbcon_accel_init(struct fb_info *info);
+#else
+#define _STUB(name, type) \
+static inline int name(struct fb_info *info, const struct type *t) \
+{ \
+	return -ENODEV; \
+}
+_STUB(nvc0_fbcon_fillrect, fb_fillrect)
+_STUB(nvc0_fbcon_copyarea, fb_copyarea)
+_STUB(nvc0_fbcon_imageblit, fb_image)
+#undef _STUB
+static inline int nvc0_fbcon_accel_init(struct fb_info *info)
+{
+	return -ENODEV;
+}
+#endif
 
 void nouveau_fbcon_gpu_lockup(struct fb_info *info);