bloblist: refactor xferlist and bloblist

Refactor the xferlist to remove the relocating when bloblist passed
from the boot args.
Refactor bloblist init to use incoming standard passage by default
if a valid transfer list exists in the boot args.
For bloblist relocation, use the actual total size if it has a smaller
BLOBLIST_SIZE_RELOC.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Suggested-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

arch/arm/lib/xferlist.c

@@ -8,18 +8,16 @@
 #include <bloblist.h>
 #include "xferlist.h"
 
-int xferlist_from_boot_arg(ulong addr, ulong size)
+int xferlist_from_boot_arg(ulong *addr)
 {
 	int ret;
 
-	ret = bloblist_check(saved_args[3], size);
-	if (ret)
-		return ret;
-
 	ret = bloblist_check_reg_conv(saved_args[0], saved_args[2],
-				      saved_args[1]);
+				      saved_args[1], saved_args[3]);
 	if (ret)
 		return ret;
 
-	return bloblist_reloc((void *)addr, size);
+	*addr = bloblist_get_base();
+
+	return 0;
 }

common/bloblist.c

@@ -492,8 +492,7 @@ int bloblist_reloc(void *to, uint to_size)
 /*
  * Weak default function for getting bloblist from boot args.
  */
-int __weak xferlist_from_boot_arg(ulong __always_unused addr,
-				  ulong __always_unused size)
+int __weak xferlist_from_boot_arg(ulong __always_unused *addr)
 {
 	return -ENOENT;
 }
@@ -501,37 +500,39 @@ int __weak xferlist_from_boot_arg(ulong __always_unused addr,
 int bloblist_init(void)
 {
 	bool fixed = IS_ENABLED(CONFIG_BLOBLIST_FIXED);
-	int ret = -ENOENT;
+	int ret = 0;
 	ulong addr = 0, size;
-	/*
-	 * If U-Boot is not in the first phase, an existing bloblist must be
-	 * at a fixed address.
-	 */
-	bool from_addr = fixed && !xpl_is_first_phase();
-	if (xpl_prev_phase() == PHASE_TPL && !IS_ENABLED(CONFIG_TPL_BLOBLIST))
-		from_addr = false;
-	if (fixed)
-		addr = IF_ENABLED_INT(CONFIG_BLOBLIST_FIXED,
-				      CONFIG_BLOBLIST_ADDR);
-	size = CONFIG_BLOBLIST_SIZE;
 
+	/* Check if a valid transfer list passed in */
+	if (!xferlist_from_boot_arg(&addr)) {
+		size = bloblist_get_total_size();
+	} else {
+		/*
+		 * If U-Boot is not in the first phase, an existing bloblist must
+		 * be at a fixed address.
+		 */
+		bool from_addr = fixed && !xpl_is_first_phase();
 
-	/*
-	 * If the current boot stage is the first phase of U-Boot, then an
-	 * architecture-specific routine should be used to handle the bloblist
-	 * passed from the previous boot loader
-	 */
-	if (xpl_is_first_phase() && !IS_ENABLED(CONFIG_BLOBLIST_ALLOC))
-		ret = xferlist_from_boot_arg(addr, size);
-	else if (from_addr)
-		ret = bloblist_check(addr, size);
+		ret = -ENOENT;
 
-	if (ret)
-		log_warning("Bloblist at %lx not found (err=%d)\n",
-			    addr, ret);
-	else
-		/* Get the real size */
-		size = gd->bloblist->total_size;
+		if (xpl_prev_phase() == PHASE_TPL &&
+		    !IS_ENABLED(CONFIG_TPL_BLOBLIST))
+			from_addr = false;
+		if (fixed)
+			addr = IF_ENABLED_INT(CONFIG_BLOBLIST_FIXED,
+					      CONFIG_BLOBLIST_ADDR);
+		size = CONFIG_BLOBLIST_SIZE;
+
+		if (from_addr)
+			ret = bloblist_check(addr, size);
+
+		if (ret)
+			log_warning("Bloblist at %lx not found (err=%d)\n",
+				    addr, ret);
+		else
+			/* Get the real size */
+			size = gd->bloblist->total_size;
+	}
 
 	if (ret) {
 		/*
@@ -556,6 +557,7 @@ int bloblist_init(void)
 		log_debug("Found existing bloblist size %lx at %lx\n", size,
 			  addr);
 	}
+
 	if (ret)
 		return log_msg_ret("ini", ret);
 	gd->flags |= GD_FLG_BLOBLIST_READY;
@@ -576,10 +578,11 @@ int bloblist_maybe_init(void)
 	return 0;
 }
 
-int bloblist_check_reg_conv(ulong rfdt, ulong rzero, ulong rsig)
+int bloblist_check_reg_conv(ulong rfdt, ulong rzero, ulong rsig, ulong xlist)
 {
 	u64 version = BLOBLIST_REGCONV_VER;
 	ulong sigval;
+	int ret;
 
 	if ((IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_SPL_BUILD)) ||
 			(IS_ENABLED(CONFIG_SPL_64BIT) && IS_ENABLED(CONFIG_SPL_BUILD))) {
@@ -590,8 +593,14 @@ int bloblist_check_reg_conv(ulong rfdt, ulong rzero, ulong rsig)
 			 ((version  & BLOBLIST_REGCONV_MASK) << BLOBLIST_REGCONV_SHIFT_32));
 	}
 
-	if (rzero || rsig != sigval ||
-	    rfdt != (ulong)bloblist_find(BLOBLISTT_CONTROL_FDT, 0)) {
+	if (rzero || rsig != sigval)
+		return -EIO;
+
+	ret = bloblist_check(xlist, 0);
+	if (ret)
+		return ret;
+
+	if (rfdt != (ulong)bloblist_find(BLOBLISTT_CONTROL_FDT, 0)) {
 		gd->bloblist = NULL;  /* Reset the gd bloblist pointer */
 		return -EIO;
 	}

common/board_f.c

@@ -624,11 +624,14 @@ static int reserve_stacks(void)
 static int reserve_bloblist(void)
 {
 #ifdef CONFIG_BLOBLIST
+	ulong size = bloblist_get_total_size();
+
+	if (size < CONFIG_BLOBLIST_SIZE_RELOC)
+		size = CONFIG_BLOBLIST_SIZE_RELOC;
+
 	/* Align to a 4KB boundary for easier reading of addresses */
-	gd->start_addr_sp = ALIGN_DOWN(gd->start_addr_sp -
-				       CONFIG_BLOBLIST_SIZE_RELOC, 0x1000);
-	gd->boardf->new_bloblist = map_sysmem(gd->start_addr_sp,
-					      CONFIG_BLOBLIST_SIZE_RELOC);
+	gd->start_addr_sp = ALIGN_DOWN(gd->start_addr_sp - size, 0x1000);
+	gd->boardf->new_bloblist = map_sysmem(gd->start_addr_sp, size);
 #endif
 
 	return 0;
@@ -698,11 +701,14 @@ static int reloc_bloblist(void)
 		return 0;
 	}
 	if (gd->boardf->new_bloblist) {
-		debug("Copying bloblist from %p to %p, size %x\n",
-		      gd->bloblist, gd->boardf->new_bloblist,
-	gd->bloblist->total_size);
-		return bloblist_reloc(gd->boardf->new_bloblist,
-				      CONFIG_BLOBLIST_SIZE_RELOC);
+		ulong size = bloblist_get_total_size();
+
+		if (size < CONFIG_BLOBLIST_SIZE_RELOC)
+			size = CONFIG_BLOBLIST_SIZE_RELOC;
+
+		debug("Copying bloblist from %p to %p, size %lx\n",
+		      gd->bloblist, gd->boardf->new_bloblist, size);
+		return bloblist_reloc(gd->boardf->new_bloblist, size);
 	}
 #endif
 

include/bloblist.h

@@ -483,19 +483,18 @@ static inline int bloblist_maybe_init(void)
  * @rfdt:  Register that holds the FDT base address.
  * @rzero: Register that must be zero.
  * @rsig:  Register that holds signature and register conventions version.
+ * @xlist: Register that holds the transfer list.
  * Return: 0 if OK, -EIO if the bloblist is not compliant to the register
  *	   conventions.
  */
-int bloblist_check_reg_conv(ulong rfdt, ulong rzero, ulong rsig);
+int bloblist_check_reg_conv(ulong rfdt, ulong rzero, ulong rsig, ulong xlist);
 
 /**
- * xferlist_from_boot_arg() - Get bloblist from the boot args and relocate it
- *			      to the specified address.
+ * xferlist_from_boot_arg() - Get bloblist from the boot args.
  *
- * @addr: Address for the bloblist
- * @size: Size of space reserved for the bloblist
+ * @addr: Address of the bloblist
  * Return: 0 if OK, else on error
  */
-int xferlist_from_boot_arg(ulong addr, ulong size);
+int xferlist_from_boot_arg(ulong *addr);
 
 #endif /* __BLOBLIST_H */