vgsp: per-mdev emulated VRAM size (1.0 multiple mediate sizes)

- nv_vgpu_type_info/ioctl gain vram_mb; nv_vgpu_device gains fb_emul_size
  bound from the mdev type at create (default 512 MiB).
- New nvidia-vgpu-turing-1g type (1024 MiB); turing max_instances 1 -> 2;
  show_description reports the per-type framebuffer and max_instance.
- Thread fb_emul_size through GSCI fb_length/region/frtsOffset, WPR2,
  NV_PFB_PRI_MMU_LOCAL_MEMORY_RANGE, the vidmem allocator bound and the BAR1
  shadow; bar_info callback uses the per-device size.
- UNTESTED at commit time: builds clean; validation blocked by the Xid 140
  incident (reboot pending). See Handoff-vGPU-IO.md ADDENDUM 48.

1 files changed, 11 insertions, 9 deletions

diff --git a/kernel/gsp_rm_emulation.c b/kernel/gsp_rm_emulation.c
index f123792..f2656bb 100644
--- a/kernel/gsp_rm_emulation.c
+++ b/kernel/gsp_rm_emulation.c
@@ -1025,7 +1025,7 @@ static void gsp_rm_handle_set_guest_system_info(struct gsp_emu_context *ctx,
  * Builds the 1656-byte GspStaticConfigInfo for TU104.
  * ============================================================ */
 
-static void gsp_rm_build_static_info(u8 *buf)
+static void gsp_rm_build_static_info(u8 *buf, u64 fb_size)
 {
 	u64 val64;
 	u32 val32;
@@ -1058,7 +1058,7 @@ static void gsp_rm_build_static_info(u8 *buf)
 	{
 		struct tu104_fb_region *region = (void *)(p + 8); /* 8-aligned */
 		val64 = 0;		memcpy(&region->base, &val64, 8);
-		val64 = (NV_VGPU_EMUL_FB_SIZE - 1);
+		val64 = (fb_size - 1);
 		memcpy(&region->limit, &val64, 8);
 		val64 = 0;		memcpy(&region->reserved, &val64, 8);
 		val32 = 0;		memcpy(&region->performance, &val32, 4);
@@ -1097,9 +1097,10 @@ static void gsp_rm_build_static_info(u8 *buf)
 	/* poisonFuseEnabled (offset 1216, 1 byte) */
 	buf[TU104_GSCI_OFF_poisonFuseEnabled] = 0;
 
-	/* fb_length (offset 1224, 8 bytes) - 512MB. Kept in lockstep with
-	 * NV_PFB_PRI_MMU_LOCAL_MEMORY_RANGE and wpr2_addr_lo. */
-	val64 = NV_VGPU_EMUL_FB_SIZE;
+	/* fb_length (offset 1224, 8 bytes) - this mdev's emulated FB size.
+	 * Kept in lockstep with NV_PFB_PRI_MMU_LOCAL_MEMORY_RANGE and
+	 * wpr2_addr_lo (all derive from nv_vgpu_fb_emul_size). */
+	val64 = fb_size;
 	memcpy(buf + TU104_GSCI_OFF_fb_length, &val64, 8);
 
 	/* fbio_mask (offset 1232, 8 bytes) - 8 FBIOs for 256-bit bus */
@@ -1167,7 +1168,7 @@ static void gsp_rm_build_static_info(u8 *buf)
 	/* fwWprLayoutOffset (offset 1640, 16 bytes): nonWprHeapOffset, frtsOffset */
 	val64 = 0;
 	memcpy(buf + TU104_GSCI_OFF_fwWprLayoutOffset, &val64, 8);
-	val64 = NV_VGPU_EMUL_FB_SIZE - 0x200000; /* frtsOffset = fbSize - 2MB */
+	val64 = fb_size - 0x200000; /* frtsOffset = fbSize - 2MB */
 	memcpy(buf + TU104_GSCI_OFF_fwWprLayoutOffset + 8, &val64, 8);
 }
 
@@ -1241,12 +1242,13 @@ static void gsp_rm_handle_get_static_info(struct gsp_emu_context *ctx,
 		return;
 	}
 
-	gsp_rm_build_static_info(reply);
+	gsp_rm_build_static_info(reply, nv_vgpu_fb_emul_size(ctx->vgpu));
 	gsp_rm_apply_static_overlay(ctx, reply);
 
 	nv_vgpu_info(ctx->vgpu, "vgsp-rm: GET_GSP_STATIC_INFO seq=%u -> %u bytes (fb=%lluMB, engines=0x%x/0x%x)",
 		     sequence, TU104_GSCI_SIZE,
-		     (unsigned long long)(NV_VGPU_EMUL_FB_SIZE >> 20), 0x60003E02, 0x362020);
+		     (unsigned long long)(nv_vgpu_fb_emul_size(ctx->vgpu) >> 20),
+		     0x60003E02, 0x362020);
 
 	if (gsp_rm_send(ctx, GSPRM_RPC_FUNC_GET_GSP_STATIC_INFO, sequence, 0,
 			reply, TU104_GSCI_SIZE))
@@ -1993,7 +1995,7 @@ static void gsp_rm_handle_kgr_get_context_buffers_info(
  */
 static u32 tu104_fb_info_data(struct gsp_emu_context *ctx, u32 index)
 {
-	u64 fb = NV_VGPU_EMUL_FB_SIZE;
+	u64 fb = nv_vgpu_fb_emul_size(ctx->vgpu);
 
 	switch (index) {
 	case TU104_FB_INFO_IDX_TILE_REGION_COUNT: