X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Flmb.c;h=83287d3869a3d8e52129982f85af166c5b1246fc;hb=28a4acb48586dc21d2d14a75a7aab7be78b7c83b;hp=549fbb3d70cf523f404c9e1ee7fd78158684c77f;hpb=c50f68c8aea421267ba7995b1c485c281b28add6;p=linux-2.6

diff --git a/lib/lmb.c b/lib/lmb.c
index 549fbb3d70..83287d3869 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -15,14 +15,6 @@
 #include <linux/bitops.h>
 #include <linux/lmb.h>
 
-#undef DEBUG
-
-#ifdef DEBUG
-#define DBG(fmt...) LMB_DBG(fmt)
-#else
-#define DBG(fmt...)
-#endif
-
 #define LMB_ALLOC_ANYWHERE	0
 
 struct lmb lmb;
@@ -32,36 +24,35 @@ void lmb_dump_all(void)
 #ifdef DEBUG
 	unsigned long i;
 
-	DBG("lmb_dump_all:\n");
-	DBG("    memory.cnt		  = 0x%lx\n", lmb.memory.cnt);
-	DBG("    memory.size		  = 0x%llx\n",
+	pr_debug("lmb_dump_all:\n");
+	pr_debug("    memory.cnt		  = 0x%lx\n", lmb.memory.cnt);
+	pr_debug("    memory.size		  = 0x%llx\n",
 	    (unsigned long long)lmb.memory.size);
 	for (i=0; i < lmb.memory.cnt ;i++) {
-		DBG("    memory.region[0x%x].base       = 0x%llx\n",
+		pr_debug("    memory.region[0x%x].base       = 0x%llx\n",
 		    i, (unsigned long long)lmb.memory.region[i].base);
-		DBG("		      .size     = 0x%llx\n",
+		pr_debug("		      .size     = 0x%llx\n",
 		    (unsigned long long)lmb.memory.region[i].size);
 	}
 
-	DBG("\n    reserved.cnt	  = 0x%lx\n", lmb.reserved.cnt);
-	DBG("    reserved.size	  = 0x%lx\n", lmb.reserved.size);
+	pr_debug("    reserved.cnt	  = 0x%lx\n", lmb.reserved.cnt);
+	pr_debug("    reserved.size	  = 0x%lx\n", lmb.reserved.size);
 	for (i=0; i < lmb.reserved.cnt ;i++) {
-		DBG("    reserved.region[0x%x].base       = 0x%llx\n",
+		pr_debug("    reserved.region[0x%x].base       = 0x%llx\n",
 		    i, (unsigned long long)lmb.reserved.region[i].base);
-		DBG("		      .size     = 0x%llx\n",
+		pr_debug("		      .size     = 0x%llx\n",
 		    (unsigned long long)lmb.reserved.region[i].size);
 	}
 #endif /* DEBUG */
 }
 
-static unsigned long __init lmb_addrs_overlap(u64 base1,
-		u64 size1, u64 base2, u64 size2)
+static unsigned long lmb_addrs_overlap(u64 base1, u64 size1, u64 base2,
+					u64 size2)
 {
-	return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
+	return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
 }
 
-static long __init lmb_addrs_adjacent(u64 base1, u64 size1,
-		u64 base2, u64 size2)
+static long lmb_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2)
 {
 	if (base2 == base1 + size1)
 		return 1;
@@ -71,7 +62,7 @@ static long __init lmb_addrs_adjacent(u64 base1, u64 size1,
 	return 0;
 }
 
-static long __init lmb_regions_adjacent(struct lmb_region *rgn,
+static long lmb_regions_adjacent(struct lmb_region *rgn,
 		unsigned long r1, unsigned long r2)
 {
 	u64 base1 = rgn->region[r1].base;
@@ -82,7 +73,7 @@ static long __init lmb_regions_adjacent(struct lmb_region *rgn,
 	return lmb_addrs_adjacent(base1, size1, base2, size2);
 }
 
-static void __init lmb_remove_region(struct lmb_region *rgn, unsigned long r)
+static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
 {
 	unsigned long i;
 
@@ -94,14 +85,13 @@ static void __init lmb_remove_region(struct lmb_region *rgn, unsigned long r)
 }
 
 /* Assumption: base addr of region 1 < base addr of region 2 */
-static void __init lmb_coalesce_regions(struct lmb_region *rgn,
+static void lmb_coalesce_regions(struct lmb_region *rgn,
 		unsigned long r1, unsigned long r2)
 {
 	rgn->region[r1].size += rgn->region[r2].size;
 	lmb_remove_region(rgn, r2);
 }
 
-/* This routine called with relocation disabled. */
 void __init lmb_init(void)
 {
 	/* Create a dummy zero size LMB which will get coalesced away later.
@@ -117,7 +107,6 @@ void __init lmb_init(void)
 	lmb.reserved.cnt = 1;
 }
 
-/* This routine may be called with relocation disabled. */
 void __init lmb_analyze(void)
 {
 	int i;
@@ -128,8 +117,7 @@ void __init lmb_analyze(void)
 		lmb.memory.size += lmb.memory.region[i].size;
 }
 
-/* This routine called with relocation disabled. */
-static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
+static long lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
 {
 	unsigned long coalesced = 0;
 	long adjacent, i;
@@ -141,7 +129,7 @@ static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
 	}
 
 	/* First try and coalesce this LMB with another. */
-	for (i=0; i < rgn->cnt; i++) {
+	for (i = 0; i < rgn->cnt; i++) {
 		u64 rgnbase = rgn->region[i].base;
 		u64 rgnsize = rgn->region[i].size;
 
@@ -149,21 +137,20 @@ static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
 			/* Already have this region, so we're done */
 			return 0;
 
-		adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
-		if ( adjacent > 0 ) {
+		adjacent = lmb_addrs_adjacent(base, size, rgnbase, rgnsize);
+		if (adjacent > 0) {
 			rgn->region[i].base -= size;
 			rgn->region[i].size += size;
 			coalesced++;
 			break;
-		}
-		else if ( adjacent < 0 ) {
+		} else if (adjacent < 0) {
 			rgn->region[i].size += size;
 			coalesced++;
 			break;
 		}
 	}
 
-	if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
+	if ((i < rgn->cnt - 1) && lmb_regions_adjacent(rgn, i, i+1)) {
 		lmb_coalesce_regions(rgn, i, i+1);
 		coalesced++;
 	}
@@ -174,7 +161,7 @@ static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
 		return -1;
 
 	/* Couldn't coalesce the LMB, so add it to the sorted table. */
-	for (i = rgn->cnt-1; i >= 0; i--) {
+	for (i = rgn->cnt - 1; i >= 0; i--) {
 		if (base < rgn->region[i].base) {
 			rgn->region[i+1].base = rgn->region[i].base;
 			rgn->region[i+1].size = rgn->region[i].size;
@@ -194,10 +181,9 @@ static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
 	return 0;
 }
 
-/* This routine may be called with relocation disabled. */
-long __init lmb_add(u64 base, u64 size)
+long lmb_add(u64 base, u64 size)
 {
-	struct lmb_region *_rgn = &(lmb.memory);
+	struct lmb_region *_rgn = &lmb.memory;
 
 	/* On pSeries LPAR systems, the first LMB is our RMO region. */
 	if (base == 0)
@@ -207,26 +193,73 @@ long __init lmb_add(u64 base, u64 size)
 
 }
 
+long lmb_remove(u64 base, u64 size)
+{
+	struct lmb_region *rgn = &(lmb.memory);
+	u64 rgnbegin, rgnend;
+	u64 end = base + size;
+	int i;
+
+	rgnbegin = rgnend = 0; /* supress gcc warnings */
+
+	/* Find the region where (base, size) belongs to */
+	for (i=0; i < rgn->cnt; i++) {
+		rgnbegin = rgn->region[i].base;
+		rgnend = rgnbegin + rgn->region[i].size;
+
+		if ((rgnbegin <= base) && (end <= rgnend))
+			break;
+	}
+
+	/* Didn't find the region */
+	if (i == rgn->cnt)
+		return -1;
+
+	/* Check to see if we are removing entire region */
+	if ((rgnbegin == base) && (rgnend == end)) {
+		lmb_remove_region(rgn, i);
+		return 0;
+	}
+
+	/* Check to see if region is matching at the front */
+	if (rgnbegin == base) {
+		rgn->region[i].base = end;
+		rgn->region[i].size -= size;
+		return 0;
+	}
+
+	/* Check to see if the region is matching at the end */
+	if (rgnend == end) {
+		rgn->region[i].size -= size;
+		return 0;
+	}
+
+	/*
+	 * We need to split the entry -  adjust the current one to the
+	 * beginging of the hole and add the region after hole.
+	 */
+	rgn->region[i].size = base - rgn->region[i].base;
+	return lmb_add_region(rgn, end, rgnend - end);
+}
+
 long __init lmb_reserve(u64 base, u64 size)
 {
-	struct lmb_region *_rgn = &(lmb.reserved);
+	struct lmb_region *_rgn = &lmb.reserved;
 
 	BUG_ON(0 == size);
 
 	return lmb_add_region(_rgn, base, size);
 }
 
-long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base,
-				u64 size)
+long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
 {
 	unsigned long i;
 
-	for (i=0; i < rgn->cnt; i++) {
+	for (i = 0; i < rgn->cnt; i++) {
 		u64 rgnbase = rgn->region[i].base;
 		u64 rgnsize = rgn->region[i].size;
-		if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
+		if (lmb_addrs_overlap(base, size, rgnbase, rgnsize))
 			break;
-		}
 	}
 
 	return (i < rgn->cnt) ? i : -1;
@@ -245,20 +278,23 @@ static u64 lmb_align_up(u64 addr, u64 size)
 static u64 __init lmb_alloc_nid_unreserved(u64 start, u64 end,
 					   u64 size, u64 align)
 {
-	u64 base;
+	u64 base, res_base;
 	long j;
 
 	base = lmb_align_down((end - size), align);
-	while (start <= base &&
-	       ((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0))
-		base = lmb_align_down(lmb.reserved.region[j].base - size,
-				      align);
-
-	if (base != 0 && start <= base) {
-		if (lmb_add_region(&lmb.reserved, base,
-				   lmb_align_up(size, align)) < 0)
-			base = ~(u64)0;
-		return base;
+	while (start <= base) {
+		j = lmb_overlaps_region(&lmb.reserved, base, size);
+		if (j < 0) {
+			/* this area isn't reserved, take it */
+			if (lmb_add_region(&lmb.reserved, base,
+					   lmb_align_up(size, align)) < 0)
+				base = ~(u64)0;
+			return base;
+		}
+		res_base = lmb.reserved.region[j].base;
+		if (res_base < size)
+			break;
+		base = lmb_align_down(res_base - size, align);
 	}
 
 	return ~(u64)0;
@@ -330,17 +366,21 @@ u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr)
 {
 	long i, j;
 	u64 base = 0;
+	u64 res_base;
 
 	BUG_ON(0 == size);
 
 	/* On some platforms, make sure we allocate lowmem */
+	/* Note that LMB_REAL_LIMIT may be LMB_ALLOC_ANYWHERE */
 	if (max_addr == LMB_ALLOC_ANYWHERE)
 		max_addr = LMB_REAL_LIMIT;
 
-	for (i = lmb.memory.cnt-1; i >= 0; i--) {
+	for (i = lmb.memory.cnt - 1; i >= 0; i--) {
 		u64 lmbbase = lmb.memory.region[i].base;
 		u64 lmbsize = lmb.memory.region[i].size;
 
+		if (lmbsize < size)
+			continue;
 		if (max_addr == LMB_ALLOC_ANYWHERE)
 			base = lmb_align_down(lmbbase + lmbsize - size, align);
 		else if (lmbbase < max_addr) {
@@ -349,22 +389,22 @@ u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr)
 		} else
 			continue;
 
-		while ((lmbbase <= base) &&
-		       ((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0) )
-			base = lmb_align_down(lmb.reserved.region[j].base - size,
-					      align);
-
-		if ((base != 0) && (lmbbase <= base))
-			break;
+		while (base && lmbbase <= base) {
+			j = lmb_overlaps_region(&lmb.reserved, base, size);
+			if (j < 0) {
+				/* this area isn't reserved, take it */
+				if (lmb_add_region(&lmb.reserved, base,
+						   lmb_align_up(size, align)) < 0)
+					return 0;
+				return base;
+			}
+			res_base = lmb.reserved.region[j].base;
+			if (res_base < size)
+				break;
+			base = lmb_align_down(res_base - size, align);
+		}
 	}
-
-	if (i < 0)
-		return 0;
-
-	if (lmb_add_region(&lmb.reserved, base, lmb_align_up(size, align)) < 0)
-		return 0;
-
-	return base;
+	return 0;
 }
 
 /* You must call lmb_analyze() before this. */
@@ -387,7 +427,7 @@ void __init lmb_enforce_memory_limit(u64 memory_limit)
 	u64 limit;
 	struct lmb_property *p;
 
-	if (! memory_limit)
+	if (!memory_limit)
 		return;
 
 	/* Truncate the lmb regions to satisfy the memory limit. */
@@ -434,3 +474,36 @@ int __init lmb_is_reserved(u64 addr)
 	}
 	return 0;
 }
+
+/*
+ * Given a <base, len>, find which memory regions belong to this range.
+ * Adjust the request and return a contiguous chunk.
+ */
+int lmb_find(struct lmb_property *res)
+{
+	int i;
+	u64 rstart, rend;
+
+	rstart = res->base;
+	rend = rstart + res->size - 1;
+
+	for (i = 0; i < lmb.memory.cnt; i++) {
+		u64 start = lmb.memory.region[i].base;
+		u64 end = start + lmb.memory.region[i].size - 1;
+
+		if (start > rend)
+			return -1;
+
+		if ((end >= rstart) && (start < rend)) {
+			/* adjust the request */
+			if (rstart < start)
+				rstart = start;
+			if (rend > end)
+				rend = end;
+			res->base = rstart;
+			res->size = rend - rstart + 1;
+			return 0;
+		}
+	}
+	return -1;
+}