1 files changed, 85 insertions, 0 deletions
diff --git a/include/linux/t10-pi.h b/include/linux/t10-pi.h
new file mode 100644
index 000000000..248f4ac95
--- /dev/null
+++ b/include/linux/t10-pi.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_T10_PI_H
+#define _LINUX_T10_PI_H
+
+#include <linux/types.h>
+#include <linux/blk-mq.h>
+
+/*
+ * A T10 PI-capable target device can be formatted with different
+ * protection schemes.	Currently 0 through 3 are defined:
+ *
+ * Type 0 is regular (unprotected) I/O
+ *
+ * Type 1 defines the contents of the guard and reference tags
+ *
+ * Type 2 defines the contents of the guard and reference tags and
+ * uses 32-byte commands to seed the latter
+ *
+ * Type 3 defines the contents of the guard tag only
+ */
+enum t10_dif_type {
+	T10_PI_TYPE0_PROTECTION = 0x0,
+	T10_PI_TYPE1_PROTECTION = 0x1,
+	T10_PI_TYPE2_PROTECTION = 0x2,
+	T10_PI_TYPE3_PROTECTION = 0x3,
+};
+
+/*
+ * T10 Protection Information tuple.
+ */
+struct t10_pi_tuple {
+	__be16 guard_tag;	/* Checksum */
+	__be16 app_tag;		/* Opaque storage */
+	__be32 ref_tag;		/* Target LBA or indirect LBA */
+};
+
+#define T10_PI_APP_ESCAPE cpu_to_be16(0xffff)
+#define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff)
+
+static inline u32 t10_pi_ref_tag(struct request *rq)
+{
+	unsigned int shift = ilog2(queue_logical_block_size(rq->q));
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+	if (rq->q->integrity.interval_exp)
+		shift = rq->q->integrity.interval_exp;
+#endif
+	return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff;
+}
+
+extern const struct blk_integrity_profile t10_pi_type1_crc;
+extern const struct blk_integrity_profile t10_pi_type1_ip;
+extern const struct blk_integrity_profile t10_pi_type3_crc;
+extern const struct blk_integrity_profile t10_pi_type3_ip;
+
+struct crc64_pi_tuple {
+	__be64 guard_tag;
+	__be16 app_tag;
+	__u8   ref_tag[6];
+};
+
+/**
+ * lower_48_bits() - return bits 0-47 of a number
+ * @n: the number we're accessing
+ */
+static inline u64 lower_48_bits(u64 n)
+{
+	return n & ((1ull << 48) - 1);
+}
+
+static inline u64 ext_pi_ref_tag(struct request *rq)
+{
+	unsigned int shift = ilog2(queue_logical_block_size(rq->q));
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+	if (rq->q->integrity.interval_exp)
+		shift = rq->q->integrity.interval_exp;
+#endif
+	return lower_48_bits(blk_rq_pos(rq) >> (shift - SECTOR_SHIFT));
+}
+
+extern const struct blk_integrity_profile ext_pi_type1_crc64;
+extern const struct blk_integrity_profile ext_pi_type3_crc64;
+
+#endif