gsp-phys: correct the FWSEC interface-patch size and staging logging

1 files changed, 36 insertions, 16 deletions

diff --git a/kernel/gsp_phys_fwsec.c b/kernel/gsp_phys_fwsec.c
index bf422df..c4b0424 100644
--- a/kernel/gsp_phys_fwsec.c
+++ b/kernel/gsp_phys_fwsec.c
@@ -162,7 +162,14 @@ bool gsp_phys_fwsec_dryrun_enabled(void)
 #define GSP_PHYS_BOOTER_UNLOAD_MBOX		0xff
 #define GSP_PHYS_BOOTER_UNLOAD_IMAGE_SIZE	0x9900
 
-/* Packed command structures consumed by the FWSEC ucode (little endian). */
+/*
+ * Command structures consumed by the FWSEC ucode (little endian, natural
+ * alignment). The reference's sizeof(FWSECLIC_READ_VBIOS_DESC) is 24 and
+ * sizeof(FWSECLIC_FRTS_REGION_DESC) is 20; the combined FRTS command is
+ * 24 + 20 = 44 bytes of payload rounded up to 48 by the 8-byte alignment
+ * of its u64 field, and the reference copies all 48 bytes (the last four
+ * are padding the ucode does not read).
+ */
 struct gsp_phys_fwsec_read_vbios_desc {
 	u32 version;
 	u32 size;
@@ -1259,8 +1266,9 @@ int gsp_phys_fwsec_dryrun_run(struct gsp_phys_boot *boot, struct pci_dev *pdev,
 		frts.frts_region_desc.frts_region_media_type,
 		frts.read_vbios_desc.version, frts.read_vbios_desc.size,
 		frts.read_vbios_desc.flags);
-	pr_info("gsp-phys-fwsec-dryrun: 44-byte interface-patch block at DMEM 0x%x: %*ph\n",
-		cmd_off, (int)sizeof(frts), (const u8 *)u.data_va + cmd_off);
+	pr_info("gsp-phys-fwsec-dryrun: interface-patch block at DMEM 0x%x (0x%zx bytes): %*ph\n",
+		cmd_off, sizeof(frts), (int)sizeof(frts),
+		(const u8 *)u.data_va + cmd_off);
 	pr_info("gsp-phys-fwsec-dryrun: expected WPR2 after a real run: HI VAL nonzero; LO VAL=0x%x raw encoding=0x%08x\n",
 		(u32)(boot->frts_offset >> 12),
 		(u32)((boot->frts_offset >> 12) << 4));
@@ -1346,17 +1354,29 @@ int gsp_phys_fwsec_release(struct gsp_phys_boot *boot, struct pci_dev *pdev,
  * ABI shape checks for the FWSEC structures and the embedded bindata. These
  * must match the generations the boot path was derived for; a mismatch means
  * the structures or the extracted images changed, which must not be ignored.
+ *
+ * File-scope static_assert()s on purpose: BUILD_BUG_ON() inside an unused
+ * static function is discarded before the compiler checks it, so it would
+ * silently pass no matter what the sizes are. The FRTS command is the
+ * reference's 44-byte payload plus its 4-byte tail padding = 48, which is
+ * exactly what s_vbiosPatchInterfaceData copies.
  */
-static void __maybe_unused gsp_phys_fwsec_abi_check(void)
-{
-	BUILD_BUG_ON(sizeof(struct gsp_phys_fwsec_read_vbios_desc) != 24);
-	BUILD_BUG_ON(sizeof(struct gsp_phys_fwsec_frts_region_desc) != 20);
-	BUILD_BUG_ON(sizeof(struct gsp_phys_fwsec_frts_cmd) != 44);
-	BUILD_BUG_ON(sizeof(struct gsp_phys_fwsec_bl_dmem_desc) != 84);
-	BUILD_BUG_ON(sizeof(struct gsp_phys_fwsec_intf_header) != 4);
-	BUILD_BUG_ON(sizeof(struct gsp_phys_fwsec_intf_entry) != 8);
-	BUILD_BUG_ON(sizeof(gsp_phys_sec2_bl_image) != 0x300);
-	BUILD_BUG_ON(GSP_PHYS_SEC2_BL_CODE_SIZE != 0x200);
-	BUILD_BUG_ON(sizeof(gsp_phys_booter_unload_image) !=
-		     GSP_PHYS_BOOTER_UNLOAD_IMAGE_SIZE);
-}
+static_assert(sizeof(struct gsp_phys_fwsec_read_vbios_desc) == 24,
+	      "FWSEC readVbiosDesc must be 24 bytes (reference ABI)");
+static_assert(sizeof(struct gsp_phys_fwsec_frts_region_desc) == 20,
+	      "FWSEC frtsRegionDesc must be 20 bytes (reference ABI)");
+static_assert(sizeof(struct gsp_phys_fwsec_frts_cmd) == 48,
+	      "FWSEC frtsCmd must be 48 bytes: 44 payload + 4 tail padding (reference ABI)");
+static_assert(sizeof(struct gsp_phys_fwsec_bl_dmem_desc) == 84,
+	      "FWSEC BL DMEM descriptor must be 84 bytes (reference ABI)");
+static_assert(sizeof(struct gsp_phys_fwsec_intf_header) == 4,
+	      "FWSEC interface header must be 4 bytes (reference ABI)");
+static_assert(sizeof(struct gsp_phys_fwsec_intf_entry) == 8,
+	      "FWSEC interface entry must be 8 bytes (reference ABI)");
+static_assert(sizeof(gsp_phys_sec2_bl_image) == 0x300,
+	      "generic SEC2 BL bindata image must be 0x300 bytes");
+static_assert(GSP_PHYS_SEC2_BL_CODE_SIZE == 0x200,
+	      "generic SEC2 BL code section must be 0x200 bytes");
+static_assert(sizeof(gsp_phys_booter_unload_image) ==
+	      GSP_PHYS_BOOTER_UNLOAD_IMAGE_SIZE,
+	      "Booter-Unload bindata image must match its header size");