drm/amdgpu: Add vbios info ioctl interface

Add AMDGPU_INFO_VBIOS_INFO subquery id for detailed vbios info.

Provides a way for the user application to get the VBIOS
information without having to parse the binary.
It is useful for the user to be able to display in a simple way the VBIOS
version in their system if they happen to encounter an issue.

V2:
Use numeric serial.
Parse and expose vbios version string.

V3:
Remove redundant data in drm_amdgpu_info_vbios struct.

V4:
64 bit alignment in drm_amdgpu_info_vbios.

v5: squash together all the reverts, etc. (Alex)

Signed-off-by: Jiawei Gu <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

···
 					    min((size_t)size, (size_t)(bios_size - bios_offset)))
 					? -EFAULT : 0;
 		}
+		case AMDGPU_INFO_VBIOS_INFO: {
+			struct drm_amdgpu_info_vbios vbios_info = {};
+			struct atom_context *atom_context;
+
+			atom_context = adev->mode_info.atom_context;
+			memcpy(vbios_info.name, atom_context->name, sizeof(atom_context->name));
+			memcpy(vbios_info.vbios_pn, atom_context->vbios_pn, sizeof(atom_context->vbios_pn));
+			vbios_info.version = atom_context->version;
+			memcpy(vbios_info.vbios_ver_str, atom_context->vbios_ver_str,
+						sizeof(atom_context->vbios_ver_str));
+			memcpy(vbios_info.date, atom_context->date, sizeof(atom_context->date));
+
+			return copy_to_user(out, &vbios_info,
+						min((size_t)size, sizeof(vbios_info))) ? -EFAULT : 0;
+		}
 		default:
 			DRM_DEBUG_KMS("Invalid request %d\n",
 					info->vbios_info.type);

drivers/gpu/drm/amd/amdgpu/atom.c

···
 
 #define ATOM_DEBUG
 
+#include "atomfirmware.h"
 #include "atom.h"
 #include "atom-names.h"
 #include "atom-bits.h"
···
 	}
 }
 
+static void atom_get_vbios_name(struct atom_context *ctx)
+{
+	unsigned char *p_rom;
+	unsigned char str_num;
+	unsigned short off_to_vbios_str;
+	unsigned char *c_ptr;
+	int name_size;
+	int i;
+
+	const char *na = "--N/A--";
+	char *back;
+
+	p_rom = ctx->bios;
+
+	str_num = *(p_rom + OFFSET_TO_GET_ATOMBIOS_NUMBER_OF_STRINGS);
+	if (str_num != 0) {
+		off_to_vbios_str =
+			*(unsigned short *)(p_rom + OFFSET_TO_GET_ATOMBIOS_STRING_START);
+
+		c_ptr = (unsigned char *)(p_rom + off_to_vbios_str);
+	} else {
+		/* do not know where to find name */
+		memcpy(ctx->name, na, 7);
+		ctx->name[7] = 0;
+		return;
+	}
+
+	/*
+	 * skip the atombios strings, usually 4
+	 * 1st is P/N, 2nd is ASIC, 3rd is PCI type, 4th is Memory type
+	 */
+	for (i = 0; i < str_num; i++) {
+		while (*c_ptr != 0)
+			c_ptr++;
+		c_ptr++;
+	}
+
+	/* skip the following 2 chars: 0x0D 0x0A */
+	c_ptr += 2;
+
+	name_size = strnlen(c_ptr, STRLEN_LONG - 1);
+	memcpy(ctx->name, c_ptr, name_size);
+	back = ctx->name + name_size;
+	while ((*--back) == ' ')
+		;
+	*(back + 1) = '\0';
+}
+
+static void atom_get_vbios_date(struct atom_context *ctx)
+{
+	unsigned char *p_rom;
+	unsigned char *date_in_rom;
+
+	p_rom = ctx->bios;
+
+	date_in_rom = p_rom + OFFSET_TO_VBIOS_DATE;
+
+	ctx->date[0] = '2';
+	ctx->date[1] = '0';
+	ctx->date[2] = date_in_rom[6];
+	ctx->date[3] = date_in_rom[7];
+	ctx->date[4] = '/';
+	ctx->date[5] = date_in_rom[0];
+	ctx->date[6] = date_in_rom[1];
+	ctx->date[7] = '/';
+	ctx->date[8] = date_in_rom[3];
+	ctx->date[9] = date_in_rom[4];
+	ctx->date[10] = ' ';
+	ctx->date[11] = date_in_rom[9];
+	ctx->date[12] = date_in_rom[10];
+	ctx->date[13] = date_in_rom[11];
+	ctx->date[14] = date_in_rom[12];
+	ctx->date[15] = date_in_rom[13];
+	ctx->date[16] = '\0';
+}
+
+static unsigned char *atom_find_str_in_rom(struct atom_context *ctx, char *str, int start,
+					   int end, int maxlen)
+{
+	unsigned long str_off;
+	unsigned char *p_rom;
+	unsigned short str_len;
+
+	str_off = 0;
+	str_len = strnlen(str, maxlen);
+	p_rom = ctx->bios;
+
+	for (; start <= end; ++start) {
+		for (str_off = 0; str_off < str_len; ++str_off) {
+			if (str[str_off] != *(p_rom + start + str_off))
+				break;
+		}
+
+		if (str_off == str_len || str[str_off] == 0)
+			return p_rom + start;
+	}
+	return NULL;
+}
+
+static void atom_get_vbios_pn(struct atom_context *ctx)
+{
+	unsigned char *p_rom;
+	unsigned short off_to_vbios_str;
+	unsigned char *vbios_str;
+	int count;
+
+	off_to_vbios_str = 0;
+	p_rom = ctx->bios;
+
+	if (*(p_rom + OFFSET_TO_GET_ATOMBIOS_NUMBER_OF_STRINGS) != 0) {
+		off_to_vbios_str =
+			*(unsigned short *)(p_rom + OFFSET_TO_GET_ATOMBIOS_STRING_START);
+
+		vbios_str = (unsigned char *)(p_rom + off_to_vbios_str);
+	} else {
+		vbios_str = p_rom + OFFSET_TO_VBIOS_PART_NUMBER;
+	}
+
+	if (*vbios_str == 0) {
+		vbios_str = atom_find_str_in_rom(ctx, BIOS_ATOM_PREFIX, 3, 1024, 64);
+		if (vbios_str == NULL)
+			vbios_str += sizeof(BIOS_ATOM_PREFIX) - 1;
+	}
+	if (vbios_str != NULL && *vbios_str == 0)
+		vbios_str++;
+
+	if (vbios_str != NULL) {
+		count = 0;
+		while ((count < BIOS_STRING_LENGTH) && vbios_str[count] >= ' ' &&
+		       vbios_str[count] <= 'z') {
+			ctx->vbios_pn[count] = vbios_str[count];
+			count++;
+		}
+
+		ctx->vbios_pn[count] = 0;
+	}
+}
+
+static void atom_get_vbios_version(struct atom_context *ctx)
+{
+	unsigned char *vbios_ver;
+
+	/* find anchor ATOMBIOSBK-AMD */
+	vbios_ver = atom_find_str_in_rom(ctx, BIOS_VERSION_PREFIX, 3, 1024, 64);
+	if (vbios_ver != NULL) {
+		/* skip ATOMBIOSBK-AMD VER */
+		vbios_ver += 18;
+		memcpy(ctx->vbios_ver_str, vbios_ver, STRLEN_NORMAL);
+	} else {
+		ctx->vbios_ver_str[0] = '\0';
+	}
+}
+
 struct atom_context *amdgpu_atom_parse(struct card_info *card, void *bios)
 {
 	int base;
 	struct atom_context *ctx =
 	    kzalloc(sizeof(struct atom_context), GFP_KERNEL);
 	char *str;
+	struct _ATOM_ROM_HEADER *atom_rom_header;
+	struct _ATOM_MASTER_DATA_TABLE *master_table;
+	struct _ATOM_FIRMWARE_INFO *atom_fw_info;
 	u16 idx;
 
 	if (!ctx)
···
 		strlcpy(ctx->vbios_version, str, sizeof(ctx->vbios_version));
 	}
 
+	atom_rom_header = (struct _ATOM_ROM_HEADER *)CSTR(base);
+	if (atom_rom_header->usMasterDataTableOffset != 0) {
+		master_table = (struct _ATOM_MASTER_DATA_TABLE *)
+				CSTR(atom_rom_header->usMasterDataTableOffset);
+		if (master_table->ListOfDataTables.FirmwareInfo != 0) {
+			atom_fw_info = (struct _ATOM_FIRMWARE_INFO *)
+					CSTR(master_table->ListOfDataTables.FirmwareInfo);
+			ctx->version = atom_fw_info->ulFirmwareRevision;
+		}
+	}
+
+	atom_get_vbios_name(ctx);
+	atom_get_vbios_pn(ctx);
+	atom_get_vbios_date(ctx);
+	atom_get_vbios_version(ctx);
 
 	return ctx;
 }

drivers/gpu/drm/amd/amdgpu/atom.h

···
 #define ATOM_IO_SYSIO		2
 #define ATOM_IO_IIO		0x80
 
+#define STRLEN_NORMAL		32
+#define STRLEN_LONG		64
+#define STRLEN_VERYLONG		254
+
 struct card_info {
 	struct drm_device *dev;
 	void (* reg_write)(struct card_info *, uint32_t, uint32_t);   /*  filled by driver */
···
 	uint32_t *scratch;
 	int scratch_size_bytes;
 	char vbios_version[20];
+
+	uint8_t name[STRLEN_LONG];
+	uint8_t vbios_pn[STRLEN_LONG];
+	uint32_t version;
+	uint8_t vbios_ver_str[STRLEN_NORMAL];
+	uint8_t date[STRLEN_NORMAL];
 };
 
 extern int amdgpu_atom_debug;

drivers/gpu/drm/amd/include/atomfirmware.h

···
   DP_VS_LEVEL0_PREEMPH_LEVEL3 = 0x18,
 };
 
+#define BIOS_ATOM_PREFIX   "ATOMBIOS"
+#define BIOS_VERSION_PREFIX  "ATOMBIOSBK-AMD"
+#define BIOS_STRING_LENGTH 43
 
 /*
 enum atom_string_def{
···
 #pragma pack(1)                          /* BIOS data must use byte aligment*/
 
 enum atombios_image_offset{
-OFFSET_TO_ATOM_ROM_HEADER_POINTER          =0x00000048,
-OFFSET_TO_ATOM_ROM_IMAGE_SIZE              =0x00000002,
-OFFSET_TO_ATOMBIOS_ASIC_BUS_MEM_TYPE       =0x94,
-MAXSIZE_OF_ATOMBIOS_ASIC_BUS_MEM_TYPE      =20,  /*including the terminator 0x0!*/
-OFFSET_TO_GET_ATOMBIOS_NUMBER_OF_STRINGS   =0x2f,
-OFFSET_TO_GET_ATOMBIOS_STRING_START        =0x6e,
+  OFFSET_TO_ATOM_ROM_HEADER_POINTER          = 0x00000048,
+  OFFSET_TO_ATOM_ROM_IMAGE_SIZE              = 0x00000002,
+  OFFSET_TO_ATOMBIOS_ASIC_BUS_MEM_TYPE       = 0x94,
+  MAXSIZE_OF_ATOMBIOS_ASIC_BUS_MEM_TYPE      = 20,  /*including the terminator 0x0!*/
+  OFFSET_TO_GET_ATOMBIOS_NUMBER_OF_STRINGS   = 0x2f,
+  OFFSET_TO_GET_ATOMBIOS_STRING_START        = 0x6e,
+  OFFSET_TO_VBIOS_PART_NUMBER                = 0x80,
+  OFFSET_TO_VBIOS_DATE                       = 0x50,
 };
 
 /****************************************************************************   

include/uapi/drm/amdgpu_drm.h

···
 	#define AMDGPU_INFO_VBIOS_SIZE		0x1
 	/* Subquery id: Query vbios image */
 	#define AMDGPU_INFO_VBIOS_IMAGE		0x2
+	/* Subquery id: Query vbios info */
+	#define AMDGPU_INFO_VBIOS_INFO		0x3
 /* Query UVD handles */
 #define AMDGPU_INFO_NUM_HANDLES			0x1C
 /* Query sensor related information */
···
 struct drm_amdgpu_info_firmware {
 	__u32 ver;
 	__u32 feature;
+};
+
+struct drm_amdgpu_info_vbios {
+	__u8 name[64];
+	__u8 vbios_pn[64];
+	__u32 version;
+	__u32 pad;
+	__u8 vbios_ver_str[32];
+	__u8 date[32];
 };
 
 #define AMDGPU_VRAM_TYPE_UNKNOWN 0