[Skiboot] [PATCH 7/7] Add CONFIG_NPU to optionally skip NPU code

[Vasant Hegde]

On 1/25/21 6:28 AM, Stewart Smith wrote:
> Can save a whopping 39kb of skiboot.lid.xz
> 

This patch breaks if we make CONFIG_NPU=0

	[AR]  skiboot.tmp.a
	[LD]  skiboot.tmp.elf
powerpc64-linux-gnu-ld: platforms/ibm-fsp/zz.o:(.platforms+0x28): undefined 
reference to `npu2_i2c_presence_detect'
make: *** [/data/code/opal/skiboot/Makefile.main:342: skiboot.tmp.elf] Error 1




> Signed-off-by: Stewart Smith <stewart at flamingspork.com>
> ---
>   Makefile                      |  2 ++
>   core/hmi.c                    |  2 +-
>   core/platform.c               |  1 -
>   hw/Makefile.inc               | 12 +++++++++---
>   hw/npu2.c                     |  1 +
>   include/pci.h                 |  3 +++
>   platforms/astbmc/Makefile.inc | 16 +++++++++++-----
>   7 files changed, 27 insertions(+), 10 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 625f212e..ce61e3af 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -61,6 +61,8 @@ DEAD_CODE_ELIMINATION ?= 0
>   CONFIG_FSP?=1
>   # Try to build without POWER8 support
>   CONFIG_P8?=1
> +# Try and build without any NPU support
> +CONFIG_NPU?=1
> 
>   #
>   # Where is the source directory, must be a full path (no ~)
> diff --git a/core/hmi.c b/core/hmi.c
> index ee4c168e..6d83e060 100644
> --- a/core/hmi.c
> +++ b/core/hmi.c
> @@ -691,7 +691,7 @@ static void find_npu2_checkstop_reason(int flat_chip_id,
>   	npu2_hmi_verbose = true;
> 
>   	if (npu2_hmi_verbose) {
> -		npu2_dump_scoms(flat_chip_id);
> +		phb->ops->dump_debug_data(flat_chip_id);
>   		prlog(PR_ERR, " _________________________ \n");
>   		prlog(PR_ERR, "<    It's Debug time!     >\n");
>   		prlog(PR_ERR, " ------------------------- \n");
> diff --git a/core/platform.c b/core/platform.c
> index 320fdea0..3f4c8bdd 100644
> --- a/core/platform.c
> +++ b/core/platform.c
> @@ -226,7 +226,6 @@ static struct platform generic_platform = {
>   	.start_preload_resource	= generic_start_preload_resource,
>   	.resource_loaded	= generic_resource_loaded,
>   	.ocapi		= &generic_ocapi,
> -	.npu2_device_detect = npu2_i2c_presence_detect, /* Assumes ZZ */
>   };
> 
>   const struct bmc_platform *bmc_platform = &generic_bmc;
> diff --git a/hw/Makefile.inc b/hw/Makefile.inc
> index ebb9ca86..8815f436 100644
> --- a/hw/Makefile.inc
> +++ b/hw/Makefile.inc
> @@ -5,15 +5,21 @@ HW_OBJS += homer.o slw.o occ.o fsi-master.o centaur.o imc.o
>   HW_OBJS += nx.o nx-rng.o nx-crypto.o nx-compress.o nx-842.o nx-gzip.o
>   HW_OBJS += sfc-ctrl.o fake-rtc.o bt.o p8-i2c.o prd.o
>   HW_OBJS += dts.o lpc-rtc.o xive.o phb4.o
> -HW_OBJS += fake-nvram.o lpc-mbox.o npu2.o npu2-hw-procedures.o
> -HW_OBJS += npu2-common.o npu2-opencapi.o phys-map.o sbe-p9.o capp.o
> -HW_OBJS += occ-sensor.o vas.o sbe-p8.o dio-p9.o lpc-port80h.o cache-p9.o
> +HW_OBJS += fake-nvram.o lpc-mbox.o
> +ifeq ($(CONFIG_NPU),1)
> +HW_OBJS += npu2.o npu2-hw-procedures.o
> +HW_OBJS += npu2-common.o npu2-opencapi.o
>   HW_OBJS += npu-opal.o npu3.o npu3-nvlink.o npu3-hw-procedures.o
> +endif
> +HW_OBJS += phys-map.o sbe-p9.o capp.o
> +HW_OBJS += occ-sensor.o vas.o sbe-p8.o dio-p9.o lpc-port80h.o cache-p9.o
>   HW_OBJS += ocmb.o
>   ifeq ($(CONFIG_P8),1)
>   HW_OBJS += phb3.o
> +ifeq ($(CONFIG_NPU),1)
>   HW_OBJS += npu.o npu-hw-procedures.o
>   endif
> +endif
>   HW=hw/built-in.a
> 
>   include $(SRC)/hw/fsp/Makefile.inc
> diff --git a/hw/npu2.c b/hw/npu2.c
> index cf57eeb0..e18a1b7b 100644
> --- a/hw/npu2.c
> +++ b/hw/npu2.c
> @@ -1316,6 +1316,7 @@ static const struct phb_ops npu_ops = {
>   	.set_capi_mode		= NULL,
>   	.set_capp_recovery	= NULL,
>   	.tce_kill		= npu2_tce_kill,
> +	.dump_debug_data	= npu2_dump_scoms,
>   };
> 
>   static void assign_mmio_bars(uint64_t gcid, uint32_t scom, uint64_t reg[2], uint64_t mm_win[2])
> diff --git a/include/pci.h b/include/pci.h
> index 05d02171..c70a507d 100644
> --- a/include/pci.h
> +++ b/include/pci.h
> @@ -343,6 +343,9 @@ struct phb_ops {
> 
>   	/* Currently only used by NPU HMI code */
>   	void (*set_fence_state)(struct phb *phb, bool fence);
> +
> +	/* The most terrible of situtions, dump debug data to console. */
> +	void (*dump_debug_data)(int flat_chip_id);
>   };
> 
>   enum phb_type {
> diff --git a/platforms/astbmc/Makefile.inc b/platforms/astbmc/Makefile.inc
> index bd0e578f..4d24db57 100644
> --- a/platforms/astbmc/Makefile.inc
> +++ b/platforms/astbmc/Makefile.inc
> @@ -1,16 +1,22 @@
>   SUBDIRS += $(PLATDIR)/astbmc
> 
>   ASTBMC_OBJS = pnor.o common.o slots.o \
> -	      witherspoon.o zaius.o romulus.o p9dsu.o \
> -	      nicole.o mihawk.o mowgli.o \
> -	      talos.o blackbird.o \
> -	      swift.o
> +	      witherspoon.o romulus.o p9dsu.o \
> +	      nicole.o mowgli.o \
> +	      talos.o blackbird.o
> +
> +ifeq ($(CONFIG_NPU),1)
> +ASTBMC_OBJS += zaius.o mihawk.o swift.o
> +endif

I thought we can boot mihawk or garrision without NPU driver.


-Vasant

> 
>   ifeq ($(CONFIG_P8),1)
>   ASTBMC_OBJS += palmetto.o habanero.o firestone.o \
>   	      p8dtu.o p8dnu.o \
> -	      garrison.o barreleye.o \
> +	      barreleye.o \
>   	      vesnin.o
> +ifeq ($(CONFIG_NPU),1)
> +ASTBMC_OBJS += garrison.o
> +endif
>   endif
> 
>   ASTBMC = $(PLATDIR)/astbmc/built-in.a
>