Scsi lib

Documentation/target/tcmu-design.txt

@@ -117,7 +117,9 @@ userspace (respectively) to put commands on the ring, and indicate
 when the commands are completed.
 
 version - 1 (userspace should abort if otherwise)
-flags - none yet defined.
+flags:
+- TCMU_MAILBOX_FLAG_CAP_OOOC: indicates out-of-order completion is
+  supported.  See "The Command Ring" for details.
 cmdr_off - The offset of the start of the command ring from the start
 of the memory region, to account for the mailbox size.
 cmdr_size - The size of the command ring. This does *not* need to be a
@@ -162,6 +164,13 @@ rsp.sense_buffer if necessary. Userspace then increments
 mailbox.cmd_tail by entry.hdr.length (mod cmdr_size) and signals the
 kernel via the UIO method, a 4-byte write to the file descriptor.
 
+If TCMU_MAILBOX_FLAG_CAP_OOOC is set for mailbox->flags, kernel is
+capable of handling out-of-order completions. In this case, userspace can
+handle command in different order other than original. Since kernel would
+still process the commands in the same order it appeared in the command
+ring, userspace need to update the cmd->id when completing the
+command(a.k.a steal the original command's entry).
+
 When the opcode is PAD, userspace only updates cmd_tail as above --
 it's a no-op. (The kernel inserts PAD entries to ensure each CMD entry
 is contiguous within the command ring.)

MAINTAINERS

@@ -5360,6 +5360,14 @@ S:	Supported
 F:	drivers/scsi/ibmvscsi/ibmvscsi*
 F:	drivers/scsi/ibmvscsi/viosrp.h
 
+IBM Power Virtual SCSI Device Target Driver
+M:	Bryant G. Ly <bryantly@linux.vnet.ibm.com>
+L:	linux-scsi@vger.kernel.org
+L:	target-devel@vger.kernel.org
+S:	Supported
+F:	drivers/scsi/ibmvscsi/ibmvscsis.*
+F:	drivers/scsi/libsrp.*
+
 IBM Power Virtual FC Device Drivers
 M:	Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
 L:	linux-scsi@vger.kernel.org

arch/powerpc/kernel/misc_64.S

@@ -701,3 +701,31 @@ _GLOBAL(kexec_sequence)
 	li	r5,0
 	blr	/* image->start(physid, image->start, 0); */
 #endif /* CONFIG_KEXEC */
+
+#ifdef CONFIG_MODULES
+#if defined(_CALL_ELF) && _CALL_ELF == 2
+
+#ifdef CONFIG_MODVERSIONS
+.weak __crc_TOC.
+.section "___kcrctab+TOC.","a"
+.globl __kcrctab_TOC.
+__kcrctab_TOC.:
+	.llong	__crc_TOC.
+#endif
+
+/*
+ * Export a fake .TOC. since both modpost and depmod will complain otherwise.
+ * Both modpost and depmod strip the leading . so we do the same here.
+ */
+.section "__ksymtab_strings","a"
+__kstrtab_TOC.:
+	.asciz "TOC."
+
+.section "___ksymtab+TOC.","a"
+/* This symbol name is important: it's used by modpost to find exported syms */
+.globl __ksymtab_TOC.
+__ksymtab_TOC.:
+	.llong 0 /* .value */
+	.llong __kstrtab_TOC.
+#endif /* ELFv2 */
+#endif /* MODULES */

arch/powerpc/kernel/module_64.c

@@ -326,22 +326,16 @@ static void dedotify_versions(struct modversion_info *vers,
 		}
 }
 
-/*
- * Undefined symbols which refer to .funcname, hack to funcname. Make .TOC.
- * seem to be defined (value set later).
- */
+/* Undefined symbols which refer to .funcname, hack to funcname (or .TOC.) */
 static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
 {
 	unsigned int i;
 
 	for (i = 1; i < numsyms; i++) {
 		if (syms[i].st_shndx == SHN_UNDEF) {
 			char *name = strtab + syms[i].st_name;
-			if (name[0] == '.') {
-				if (strcmp(name+1, "TOC.") == 0)
-					syms[i].st_shndx = SHN_ABS;
-				syms[i].st_name++;
-			}
+			if (name[0] == '.')
+				memmove(name, name+1, strlen(name));
 		}
 	}
 }
@@ -357,7 +351,7 @@ static Elf64_Sym *find_dot_toc(Elf64_Shdr *sechdrs,
 	numsyms = sechdrs[symindex].sh_size / sizeof(Elf64_Sym);
 
 	for (i = 1; i < numsyms; i++) {
-		if (syms[i].st_shndx == SHN_ABS
+		if (syms[i].st_shndx == SHN_UNDEF
 		    && strcmp(strtab + syms[i].st_name, "TOC.") == 0)
 			return &syms[i];
 	}