bloblist: Refactor Kconfig to support alloc or fixed

At present we do support allocating the bloblist but the Kconfig is a bit
strange, since we still have to specify an address in that case. Partly
this is because it is a pain to have CONFIG options that disappears when
its dependency is enabled. It means that we must have #ifdefs in the code,
either in the C code or header file.

Make use of IF_ENABLED_INT() and its friend to solve that problem, so we
can separate out the location of bloblist into a choice. Put the address
and size into variables so we can log the result.

Add the options for SPL as well, so we can use CONFIG_IS_ENABLED().

Signed-off-by: Simon Glass <sjg@chromium.org>

common/Kconfig

@@ -738,15 +738,17 @@ config TPL_BLOBLIST
 
 if BLOBLIST
 
-config BLOBLIST_SIZE
-	hex "Size of bloblist"
-	depends on BLOBLIST
-	default 0x400
+choice
+	prompt "Bloblist location"
 	help
-	  Sets the size of the bloblist in bytes. This must include all
-	  overhead (alignment, bloblist header, record header). The bloblist
-	  is set up in the first part of U-Boot to run (TPL, SPL or U-Boot
-	  proper), and this sane bloblist is used for subsequent phases.
+	  Select the location of the bloblist, via various means.
+
+config BLOBLIST_FIXED
+	bool "Place bloblist at a fixed address in memory"
+	help
+	  Select this to used a fixed memory address for the bloblist. If the
+	  bloblist exists at this address from a previous phase, it used as is.
+	  If not it is created at this address in U-Boot.
 
 config BLOBLIST_ALLOC
 	bool "Allocate bloblist"
@@ -755,18 +757,31 @@ config BLOBLIST_ALLOC
 	  specify a fixed address on systems where this is unknown or can
 	  change at runtime.
 
+endchoice
+
 config BLOBLIST_ADDR
 	hex "Address of bloblist"
 	default 0xc000 if SANDBOX
+	depends on BLOBLIST_FIXED
 	help
 	  Sets the address of the bloblist, set up by the first part of U-Boot
 	  which runs. Subsequent U-Boot phases typically use the same address.
 
 	  This is not used if BLOBLIST_ALLOC is selected.
 
+config BLOBLIST_SIZE
+	hex "Size of bloblist"
+	default 0x400
+	help
+	  Sets the size of the bloblist in bytes. This must include all
+	  overhead (alignment, bloblist header, record header). The bloblist
+	  is set up in the first part of U-Boot to run (TPL, SPL or U-Boot
+	  proper), and this sane bloblist is used for subsequent phases.
+
 config BLOBLIST_SIZE_RELOC
 	hex "Size of bloblist after relocation"
-	default BLOBLIST_SIZE
+	default BLOBLIST_SIZE if BLOBLIST_FIXED || BLOBLIST_ALLOC
+	default 0 if BLOBLIST_PASSAGE
 	help
 	  Sets the size of the bloblist in bytes after relocation. Since U-Boot
 	  has a lot more memory available then, it is possible to use a larger
@@ -775,6 +790,64 @@ config BLOBLIST_SIZE_RELOC
 
 endif # BLOBLIST
 
+if SPL_BLOBLIST
+
+choice
+	prompt "Bloblist location in SPL"
+	help
+	  Select the location of the bloblist, via various means. Typically
+	  you should use the same value for SPL as for U-Boot, since they need
+	  to look in the same place. But if BLOBLIST_ALLOC is used, then a
+	  fresh bloblist will be created each time, since there is no shared
+	  address (between phases) for the bloblist.
+
+config SPL_BLOBLIST_FIXED
+	bool "Place bloblist at a fixed address in memory"
+	help
+	  Select this to used a fixed memory address for the bloblist. If the
+	  bloblist exists at this address from a previous phase, it used as is.
+	  If not it is created at this address in SPL.
+
+config SPL_BLOBLIST_ALLOC
+	bool "Allocate bloblist"
+	help
+	  Allocate the bloblist using malloc(). This avoids the need to
+	  specify a fixed address on systems where this is unknown or can
+	  change at runtime.
+
+endchoice
+
+endif # SPL_BLOBLIST
+
+if TPL_BLOBLIST
+
+choice
+	prompt "Bloblist location in TPL"
+	help
+	  Select the location of the bloblist, via various means. Typically
+	  you should use the same value for SPL as for U-Boot, since they need
+	  to look in the same place. But if BLOBLIST_ALLOC is used, then a
+	  fresh bloblist will be created each time, since there is no shared
+	  address (between phases) for the bloblist.
+
+config TPL_BLOBLIST_FIXED
+	bool "Place bloblist at a fixed address in memory"
+	help
+	  Select this to used a fixed memory address for the bloblist. If the
+	  bloblist exists at this address from a previous phase, it used as is.
+	  If not it is created at this address in TPL.
+
+config TPL_BLOBLIST_ALLOC
+	bool "Allocate bloblist"
+	help
+	  Allocate the bloblist using malloc(). This avoids the need to
+	  specify a fixed address on systems where this is unknown or can
+	  change at runtime.
+
+endchoice
+
+endif # TPL_BLOBLIST
+
 endmenu
 
 source "common/spl/Kconfig"

common/bloblist.c

@@ -4,6 +4,7 @@
  * Written by Simon Glass <sjg@chromium.org>
  */
 
+#define LOG_DEBUG
 #define LOG_CATEGORY	LOGC_BLOBLIST
 
 #include <common.h>
@@ -360,6 +361,8 @@ int bloblist_finish(void)
 	struct bloblist_hdr *hdr = gd->bloblist;
 
 	hdr->chksum = bloblist_calc_chksum(hdr);
+	log_debug("Finished bloblist size %lx at %lx\n", (ulong)hdr->size,
+		  (ulong)map_to_sysmem(hdr));
 
 	return 0;
 }
@@ -415,8 +418,9 @@ void bloblist_reloc(void *to, uint to_size, void *from, uint from_size)
 
 int bloblist_init(void)
 {
-	bool expected;
 	int ret = -ENOENT;
+	ulong addr, size;
+	bool expected;
 
 	/**
 	 * Wed expect to find an existing bloblist in the first phase of U-Boot
@@ -425,27 +429,32 @@ int bloblist_init(void)
 	expected = !u_boot_first_phase();
 	if (spl_prev_phase() == PHASE_TPL && !IS_ENABLED(CONFIG_TPL_BLOBLIST))
 		expected = false;
-	if (expected)
-		ret = bloblist_check(CONFIG_BLOBLIST_ADDR,
-				     CONFIG_BLOBLIST_SIZE);
+	addr = bloblist_addr();
+	size = CONFIG_BLOBLIST_SIZE;
+	if (expected) {
+		ret = bloblist_check(addr, size);
+		if (ret) {
+			log_warning("Expected bloblist at %lx not found (err=%d)\n",
+				    addr, ret);
+		} else {
+			/* Get the real size, if it is not what we expected */
+			size = gd->bloblist->size;
+		}
+	}
 	if (ret) {
-		ulong addr;
-
-		log(LOGC_BLOBLIST, expected ? LOGL_WARNING : LOGL_DEBUG,
-		    "Existing bloblist not found: creating new bloblist\n");
-		if (IS_ENABLED(CONFIG_BLOBLIST_ALLOC)) {
-			void *ptr = memalign(BLOBLIST_ALIGN,
-					     CONFIG_BLOBLIST_SIZE);
+		if (CONFIG_IS_ENABLED(BLOBLIST_ALLOC)) {
+			void *ptr = memalign(BLOBLIST_ALIGN, size);
 
 			if (!ptr)
 				return log_msg_ret("alloc", -ENOMEM);
 			addr = map_to_sysmem(ptr);
-		} else {
-			addr = CONFIG_BLOBLIST_ADDR;
 		}
-		ret = bloblist_new(addr, CONFIG_BLOBLIST_SIZE, 0);
+		log_debug("Creating new bloblist size %lx at %lx\n", size,
+			  addr);
+		ret = bloblist_new(addr, size, 0);
 	} else {
-		log_debug("Found existing bloblist\n");
+		log_debug("Found existing bloblist size %lx at %lx\n", size,
+			  addr);
 	}
 
 	return ret;

include/bloblist.h

@@ -147,6 +147,16 @@ struct bloblist_rec {
 	u32 spare;
 };
 
+/* access CONFIG_BLOBLIST_ADDR, dealing with it possibly not being defined */
+static inline ulong bloblist_addr(void)
+{
+#ifdef CONFIG_BLOBLIST_FIXED
+	return CONFIG_BLOBLIST_ADDR;
+#else
+	return 0;
+#endif
+}
+
 /**
  * bloblist_check_magic() - return a bloblist if the magic matches
  *