s390/dump: introduce boot data 'oldmem_data'

The new boot data struct shall replace global variables OLDMEM_BASE and
OLDMEM_SIZE. It is initialized in the decompressor and passed
to the decompressed kernel. In comparison to the old solution, this one
doesn't access data at fixed physical addresses which will become important
when the decompressor becomes relocatable.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

1 files changed, 23 insertions, 23 deletions

diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index 0e36dfc9ccd6..d72a6df058d7 100644
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -140,7 +140,7 @@ int copy_oldmem_kernel(void *dst, void *src, size_t count)
 
 	while (count) {
 		from = __pa(src);
-		if (!OLDMEM_BASE && from < sclp.hsa_size) {
+		if (!oldmem_data.start && from < sclp.hsa_size) {
 			/* Copy from zfcp/nvme dump HSA area */
 			len = min(count, sclp.hsa_size - from);
 			rc = memcpy_hsa_kernel(dst, from, len);
@@ -148,12 +148,12 @@ int copy_oldmem_kernel(void *dst, void *src, size_t count)
 				return rc;
 		} else {
 			/* Check for swapped kdump oldmem areas */
-			if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
-				from -= OLDMEM_BASE;
-				len = min(count, OLDMEM_SIZE - from);
-			} else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
-				len = min(count, OLDMEM_SIZE - from);
-				from += OLDMEM_BASE;
+			if (oldmem_data.start && from - oldmem_data.start < oldmem_data.size) {
+				from -= oldmem_data.start;
+				len = min(count, oldmem_data.size - from);
+			} else if (oldmem_data.start && from < oldmem_data.size) {
+				len = min(count, oldmem_data.size - from);
+				from += oldmem_data.start;
 			} else {
 				len = count;
 			}
@@ -183,7 +183,7 @@ static int copy_oldmem_user(void __user *dst, void *src, size_t count)
 
 	while (count) {
 		from = __pa(src);
-		if (!OLDMEM_BASE && from < sclp.hsa_size) {
+		if (!oldmem_data.start && from < sclp.hsa_size) {
 			/* Copy from zfcp/nvme dump HSA area */
 			len = min(count, sclp.hsa_size - from);
 			rc = memcpy_hsa_user(dst, from, len);
@@ -191,12 +191,12 @@ static int copy_oldmem_user(void __user *dst, void *src, size_t count)
 				return rc;
 		} else {
 			/* Check for swapped kdump oldmem areas */
-			if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
-				from -= OLDMEM_BASE;
-				len = min(count, OLDMEM_SIZE - from);
-			} else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
-				len = min(count, OLDMEM_SIZE - from);
-				from += OLDMEM_BASE;
+			if (oldmem_data.start && from - oldmem_data.size < oldmem_data.size) {
+				from -= oldmem_data.size;
+				len = min(count, oldmem_data.size - from);
+			} else if (oldmem_data.start && from < oldmem_data.size) {
+				len = min(count, oldmem_data.size - from);
+				from += oldmem_data.start;
 			} else {
 				len = count;
 			}
@@ -243,10 +243,10 @@ static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma,
 	unsigned long size_old;
 	int rc;
 
-	if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) {
-		size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT));
+	if (pfn < oldmem_data.size >> PAGE_SHIFT) {
+		size_old = min(size, oldmem_data.size - (pfn << PAGE_SHIFT));
 		rc = remap_pfn_range(vma, from,
-				     pfn + (OLDMEM_BASE >> PAGE_SHIFT),
+				     pfn + (oldmem_data.start >> PAGE_SHIFT),
 				     size_old, prot);
 		if (rc || size == size_old)
 			return rc;
@@ -288,7 +288,7 @@ static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma,
 int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,
 			   unsigned long pfn, unsigned long size, pgprot_t prot)
 {
-	if (OLDMEM_BASE)
+	if (oldmem_data.start)
 		return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot);
 	else
 		return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size,
@@ -633,17 +633,17 @@ int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
 	u64 hdr_off;
 
 	/* If we are not in kdump or zfcp/nvme dump mode return */
-	if (!OLDMEM_BASE && !is_ipl_type_dump())
+	if (!oldmem_data.start && !is_ipl_type_dump())
 		return 0;
 	/* If we cannot get HSA size for zfcp/nvme dump return error */
 	if (is_ipl_type_dump() && !sclp.hsa_size)
 		return -ENODEV;
 
 	/* For kdump, exclude previous crashkernel memory */
-	if (OLDMEM_BASE) {
-		oldmem_region.base = OLDMEM_BASE;
-		oldmem_region.size = OLDMEM_SIZE;
-		oldmem_type.total_size = OLDMEM_SIZE;
+	if (oldmem_data.start) {
+		oldmem_region.base = oldmem_data.start;
+		oldmem_region.size = oldmem_data.size;
+		oldmem_type.total_size = oldmem_data.size;
 	}
 
 	mem_chunk_cnt = get_mem_chunk_cnt();