drm/nouveau/fb/gp102-ga100: switch to simpler vram size detection method

Also exposes this for use by upcoming GSP-RM initialisation code.

v2: add SPDX header

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230525003106.3853741-3-skeggsb@gmail.com

drivers/gpu/drm/nouveau/include/nvkm/subdev/fb.h

@@ -59,6 +59,7 @@ struct nvkm_fb {
 	struct nvkm_memory *mmu_wr;
 };
 
+u64 nvkm_fb_vidmem_size(struct nvkm_device *);
 int nvkm_fb_mem_unlock(struct nvkm_fb *);
 
 void nvkm_fb_tile_init(struct nvkm_fb *, int region, u32 addr, u32 size,

drivers/gpu/drm/nouveau/nvkm/subdev/fb/Kbuild

@@ -55,6 +55,7 @@ nvkm-y += nvkm/subdev/fb/ramgk104.o
 nvkm-y += nvkm/subdev/fb/ramgm107.o
 nvkm-y += nvkm/subdev/fb/ramgm200.o
 nvkm-y += nvkm/subdev/fb/ramgp100.o
+nvkm-y += nvkm/subdev/fb/ramgp102.o
 nvkm-y += nvkm/subdev/fb/ramga102.o
 nvkm-y += nvkm/subdev/fb/sddr2.o
 nvkm-y += nvkm/subdev/fb/sddr3.o

drivers/gpu/drm/nouveau/nvkm/subdev/fb/base.c

@@ -174,6 +174,18 @@ nvkm_fb_mem_unlock(struct nvkm_fb *fb)
 	return 0;
 }
 
+u64
+nvkm_fb_vidmem_size(struct nvkm_device *device)
+{
+	struct nvkm_fb *fb = device->fb;
+
+	if (fb && fb->func->vidmem.size)
+		return fb->func->vidmem.size(fb);
+
+	WARN_ON(1);
+	return 0;
+}
+
 static int
 nvkm_fb_init(struct nvkm_subdev *subdev)
 {

drivers/gpu/drm/nouveau/nvkm/subdev/fb/ga100.c

@@ -30,7 +30,8 @@ ga100_fb = {
 	.init_page = gv100_fb_init_page,
 	.init_unkn = gp100_fb_init_unkn,
 	.sysmem.flush_page_init = gf100_fb_sysmem_flush_page_init,
-	.ram_new = gp100_ram_new,
+	.vidmem.size = gp102_fb_vidmem_size,
+	.ram_new = gp102_ram_new,
 	.default_bigpage = 16,
 };
 

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp102.c

@@ -40,6 +40,20 @@ gp102_fb_vpr_scrub_required(struct nvkm_fb *fb)
 	return (nvkm_rd32(device, 0x100cd0) & 0x00000010) != 0;
 }
 
+u64
+gp102_fb_vidmem_size(struct nvkm_fb *fb)
+{
+	const u32 data = nvkm_rd32(fb->subdev.device, 0x100ce0);
+	const u32 lmag = (data & 0x000003f0) >> 4;
+	const u32 lsca = (data & 0x0000000f);
+	const u64 size = (u64)lmag << (lsca + 20);
+
+	if (data & 0x40000000)
+		return size / 16 * 15;
+
+	return size;
+}
+
 int
 gp102_fb_oneinit(struct nvkm_fb *fb)
 {
@@ -59,9 +73,10 @@ gp102_fb = {
 	.init_remapper = gp100_fb_init_remapper,
 	.init_page = gm200_fb_init_page,
 	.sysmem.flush_page_init = gf100_fb_sysmem_flush_page_init,
+	.vidmem.size = gp102_fb_vidmem_size,
 	.vpr.scrub_required = gp102_fb_vpr_scrub_required,
 	.vpr.scrub = gp102_fb_vpr_scrub,
-	.ram_new = gp100_ram_new,
+	.ram_new = gp102_ram_new,
 };
 
 int

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gv100.c

@@ -36,9 +36,10 @@ gv100_fb = {
 	.init_page = gv100_fb_init_page,
 	.init_unkn = gp100_fb_init_unkn,
 	.sysmem.flush_page_init = gf100_fb_sysmem_flush_page_init,
+	.vidmem.size = gp102_fb_vidmem_size,
 	.vpr.scrub_required = gp102_fb_vpr_scrub_required,
 	.vpr.scrub = gp102_fb_vpr_scrub,
-	.ram_new = gp100_ram_new,
+	.ram_new = gp102_ram_new,
 	.default_bigpage = 16,
 };
 

drivers/gpu/drm/nouveau/nvkm/subdev/fb/priv.h

@@ -20,6 +20,10 @@ struct nvkm_fb_func {
 		void (*flush_page_init)(struct nvkm_fb *);
 	} sysmem;
 
+	struct nvkm_fb_func_vidmem {
+		u64 (*size)(struct nvkm_fb *);
+	} vidmem;
+
 	struct {
 		bool (*scrub_required)(struct nvkm_fb *);
 		int (*scrub)(struct nvkm_fb *);
@@ -84,6 +88,7 @@ void gp100_fb_init_remapper(struct nvkm_fb *);
 void gp100_fb_init_unkn(struct nvkm_fb *);
 
 int gp102_fb_oneinit(struct nvkm_fb *);
+u64 gp102_fb_vidmem_size(struct nvkm_fb *);
 bool gp102_fb_vpr_scrub_required(struct nvkm_fb *);
 int gp102_fb_vpr_scrub(struct nvkm_fb *);
 

drivers/gpu/drm/nouveau/nvkm/subdev/fb/ram.h

@@ -70,5 +70,6 @@ int gk104_ram_new(struct nvkm_fb *, struct nvkm_ram **);
 int gm107_ram_new(struct nvkm_fb *, struct nvkm_ram **);
 int gm200_ram_new(struct nvkm_fb *, struct nvkm_ram **);
 int gp100_ram_new(struct nvkm_fb *, struct nvkm_ram **);
+int gp102_ram_new(struct nvkm_fb *, struct nvkm_ram **);
 int ga102_ram_new(struct nvkm_fb *, struct nvkm_ram **);
 #endif

drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramgp102.c

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: MIT
+#include "ram.h"
+
+#include <subdev/bios.h>
+
+static const struct nvkm_ram_func
+gp102_ram = {
+};
+
+int
+gp102_ram_new(struct nvkm_fb *fb, struct nvkm_ram **pram)
+{
+	enum nvkm_ram_type type = nvkm_fb_bios_memtype(fb->subdev.device->bios);
+	const u32 rsvd_head = ( 256 * 1024); /* vga memory */
+	const u32 rsvd_tail = (1024 * 1024); /* vbios etc */
+	u64 size = fb->func->vidmem.size(fb);
+	int ret;
+
+	ret = nvkm_ram_new_(&gp102_ram, fb, type, size, pram);
+	if (ret)
+		return ret;
+
+	nvkm_mm_fini(&(*pram)->vram);
+
+	return nvkm_mm_init(&(*pram)->vram, NVKM_RAM_MM_NORMAL,
+			    rsvd_head >> NVKM_RAM_MM_SHIFT,
+			    (size - rsvd_head - rsvd_tail) >> NVKM_RAM_MM_SHIFT,
+			    1);
+
+}

drivers/gpu/drm/nouveau/nvkm/subdev/fb/tu102.c

@@ -36,9 +36,10 @@ tu102_fb = {
 	.init_page = gv100_fb_init_page,
 	.init_unkn = gp100_fb_init_unkn,
 	.sysmem.flush_page_init = gf100_fb_sysmem_flush_page_init,
+	.vidmem.size = gp102_fb_vidmem_size,
 	.vpr.scrub_required = tu102_fb_vpr_scrub_required,
 	.vpr.scrub = gp102_fb_vpr_scrub,
-	.ram_new = gp100_ram_new,
+	.ram_new = gp102_ram_new,
 	.default_bigpage = 16,
 };