[S390] Convert to SPARSEMEM & SPARSEMEM_VMEMMAP

Convert s390 to SPARSEMEM and SPARSEMEM_VMEMMAP. We do a select
of SPARSEMEM_VMEMMAP since it is configurable. This is because
SPARSEMEM without SPARSEMEM_VMEMMAP gives us a hell of broken
include dependencies that I don't want to fix.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

8 files changed, 53 insertions, 116 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 8f5f02160ffc..29a7940f284f 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -300,6 +300,14 @@ comment "Kernel preemption"
 
 source "kernel/Kconfig.preempt"
 
+config ARCH_SPARSEMEM_ENABLE
+        def_bool y
+        select SPARSEMEM_VMEMMAP_ENABLE
+        select SPARSEMEM_VMEMMAP
+
+config ARCH_SPARSEMEM_DEFAULT
+        def_bool y
+
 source "mm/Kconfig"
 
 comment "I/O subsystem configuration"
diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c
index ed2af0a3303b..f231f5ec74b6 100644
--- a/arch/s390/mm/extmem.c
+++ b/arch/s390/mm/extmem.c
@@ -287,7 +287,7 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
         if (rc < 0)
                 goto out_free;
 
-        rc = add_shared_memory(seg->start_addr, seg->end - seg->start_addr + 1);
+        rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
 
         if (rc)
                 goto out_free;
@@ -351,7 +351,7 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
         release_resource(seg->res);
         kfree(seg->res);
  out_shared:
-        remove_shared_memory(seg->start_addr, seg->end - seg->start_addr + 1);
+        vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
  out_free:
         kfree(seg);
  out:
@@ -474,7 +474,7 @@ segment_modify_shared (char *name, int do_nonshared)
         rc = 0;
         goto out_unlock;
  out_del:
-        remove_shared_memory(seg->start_addr, seg->end - seg->start_addr + 1);
+        vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
         list_del(&seg->list);
         dcss_diag(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy);
         kfree(seg);
@@ -508,7 +508,7 @@ segment_unload(char *name)
                 goto out_unlock;
         release_resource(seg->res);
         kfree(seg->res);
-        remove_shared_memory(seg->start_addr, seg->end - seg->start_addr + 1);
+        vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
         list_del(&seg->list);
         dcss_diag(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy);
         kfree(seg);
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index acc92f46a096..fa31de6ae97a 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -106,6 +106,8 @@ void __init paging_init(void)
         __ctl_load(S390_lowcore.kernel_asce, 13, 13);
         __raw_local_irq_ssm(ssm_mask);
 
+        sparse_memory_present_with_active_regions(MAX_NUMNODES);
+        sparse_init();
         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 #ifdef CONFIG_ZONE_DMA
         max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 97bce6c97574..beccacf907f3 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -27,43 +27,6 @@ struct memory_segment {
 
 static LIST_HEAD(mem_segs);
 
-void __meminit memmap_init(unsigned long size, int nid, unsigned long zone,
-                           unsigned long start_pfn)
-{
-        struct page *start, *end;
-        struct page *map_start, *map_end;
-        int i;
-
-        start = pfn_to_page(start_pfn);
-        end = start + size;
-
-        for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
-                unsigned long cstart, cend;
-
-                cstart = PFN_DOWN(memory_chunk[i].addr);
-                cend = cstart + PFN_DOWN(memory_chunk[i].size);
-
-                map_start = mem_map + cstart;
-                map_end = mem_map + cend;
-
-                if (map_start < start)
-                        map_start = start;
-                if (map_end > end)
-                        map_end = end;
-
-                map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1))
-                        / sizeof(struct page);
-                map_end += ((PFN_ALIGN((unsigned long) map_end)
-                             - (unsigned long) map_end)
-                            / sizeof(struct page));
-
-                if (map_start < map_end)
-                        memmap_init_zone((unsigned long)(map_end - map_start),
-                                         nid, zone, page_to_pfn(map_start),
-                                         MEMMAP_EARLY);
-        }
-}
-
 static void __ref *vmem_alloc_pages(unsigned int order)
 {
         if (slab_is_available())
@@ -115,7 +78,7 @@ static pte_t __init_refok *vmem_pte_alloc(void)
 /*
  * Add a physical memory range to the 1:1 mapping.
  */
-static int vmem_add_range(unsigned long start, unsigned long size, int ro)
+static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
 {
         unsigned long address;
         pgd_t *pg_dir;
@@ -209,10 +172,9 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
 /*
  * Add a backed mem_map array to the virtual mem_map array.
  */
-static int vmem_add_mem_map(unsigned long start, unsigned long size)
+int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node)
 {
         unsigned long address, start_addr, end_addr;
-        struct page *map_start, *map_end;
         pgd_t *pg_dir;
         pud_t *pu_dir;
         pmd_t *pm_dir;
@@ -220,11 +182,8 @@ static int vmem_add_mem_map(unsigned long start, unsigned long size)
         pte_t  pte;
         int ret = -ENOMEM;
 
-        map_start = VMEM_MAP + PFN_DOWN(start);
-        map_end = VMEM_MAP + PFN_DOWN(start + size);
-
-        start_addr = (unsigned long) map_start & PAGE_MASK;
-        end_addr = PFN_ALIGN((unsigned long) map_end);
+        start_addr = (unsigned long) start;
+        end_addr = (unsigned long) (start + nr);
 
         for (address = start_addr; address < end_addr; address += PAGE_SIZE) {
                 pg_dir = pgd_offset_k(address);
@@ -268,16 +227,6 @@ out:
         return ret;
 }
 
-static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
-{
-        int ret;
-
-        ret = vmem_add_mem_map(start, size);
-        if (ret)
-                return ret;
-        return vmem_add_range(start, size, ro);
-}
-
 /*
  * Add memory segment to the segment list if it doesn't overlap with
  * an already present segment.
@@ -315,7 +264,7 @@ static void __remove_shared_memory(struct memory_segment *seg)
         vmem_remove_range(seg->start, seg->size);
 }
 
-int remove_shared_memory(unsigned long start, unsigned long size)
+int vmem_remove_mapping(unsigned long start, unsigned long size)
 {
         struct memory_segment *seg;
         int ret;
@@ -339,11 +288,9 @@ out:
         return ret;
 }
 
-int add_shared_memory(unsigned long start, unsigned long size)
+int vmem_add_mapping(unsigned long start, unsigned long size)
 {
         struct memory_segment *seg;
-        struct page *page;
-        unsigned long pfn, num_pfn, end_pfn;
         int ret;
 
         mutex_lock(&vmem_mutex);
@@ -361,21 +308,6 @@ int add_shared_memory(unsigned long start, unsigned long size)
         ret = vmem_add_mem(start, size, 0);
         if (ret)
                 goto out_remove;
-
-        pfn = PFN_DOWN(start);
-        num_pfn = PFN_DOWN(size);
-        end_pfn = pfn + num_pfn;
-
-        page = pfn_to_page(pfn);
-        memset(page, 0, num_pfn * sizeof(struct page));
-
-        for (; pfn < end_pfn; pfn++) {
-                page = pfn_to_page(pfn);
-                init_page_count(page);
-                reset_page_mapcount(page);
-                SetPageReserved(page);
-                INIT_LIST_HEAD(&page->lru);
-        }
         goto out;
 
 out_remove:
@@ -401,7 +333,6 @@ void __init vmem_map_init(void)
         INIT_LIST_HEAD(&init_mm.context.crst_list);
         INIT_LIST_HEAD(&init_mm.context.pgtable_list);
         init_mm.context.noexec = 0;
-        NODE_DATA(0)->node_mem_map = VMEM_MAP;
         ro_start = ((unsigned long)&_stext) & PAGE_MASK;
         ro_end = PFN_ALIGN((unsigned long)&_eshared);
         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index bbef3764fbf8..47a7e6200b26 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -17,6 +17,7 @@
 #include <linux/virtio_config.h>
 #include <linux/interrupt.h>
 #include <linux/virtio_ring.h>
+#include <linux/pfn.h>
 #include <asm/io.h>
 #include <asm/kvm_para.h>
 #include <asm/kvm_virtio.h>
@@ -180,11 +181,10 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
 
         config = kvm_vq_config(kdev->desc)+index;
 
-        if (add_shared_memory(config->address,
-                                vring_size(config->num, PAGE_SIZE))) {
-                err = -ENOMEM;
+        err = vmem_add_mapping(config->address,
+                               vring_size(config->num, PAGE_SIZE));
+        if (err)
                 goto out;
-        }
 
         vq = vring_new_virtqueue(config->num, vdev, (void *) config->address,
                                  kvm_notify, callback);
@@ -202,8 +202,8 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
         vq->priv = config;
         return vq;
 unmap:
-        remove_shared_memory(config->address, vring_size(config->num,
-                             PAGE_SIZE));
+        vmem_remove_mapping(config->address,
+                            vring_size(config->num, PAGE_SIZE));
 out:
         return ERR_PTR(err);
 }
@@ -213,8 +213,8 @@ static void kvm_del_vq(struct virtqueue *vq)
         struct kvm_vqconfig *config = vq->priv;
 
         vring_del_virtqueue(vq);
-        remove_shared_memory(config->address,
-                             vring_size(config->num, PAGE_SIZE));
+        vmem_remove_mapping(config->address,
+                            vring_size(config->num, PAGE_SIZE));
 }
 
 /*
@@ -318,12 +318,13 @@ static int __init kvm_devices_init(void)
                 return rc;
         }
 
-        if (add_shared_memory((max_pfn) << PAGE_SHIFT, PAGE_SIZE)) {
+        rc = vmem_add_mapping(PFN_PHYS(max_pfn), PAGE_SIZE);
+        if (rc) {
                 device_unregister(&kvm_root);
-                return -ENOMEM;
+                return rc;
         }
 
-        kvm_devices  = (void *) (max_pfn << PAGE_SHIFT);
+        kvm_devices = (void *) PFN_PHYS(max_pfn);
 
         ctl_set_bit(0, 9);
         register_external_interrupt(0x2603, kvm_extint_handler);
diff --git a/include/asm-s390/page.h b/include/asm-s390/page.h
index b01e6fc9a295..f0f4579eac13 100644
--- a/include/asm-s390/page.h
+++ b/include/asm-s390/page.h
@@ -125,26 +125,6 @@ page_get_storage_key(unsigned long addr)
         return skey;
 }
 
-extern unsigned long max_pfn;
-
-static inline int pfn_valid(unsigned long pfn)
-{
-        unsigned long dummy;
-        int ccode;
-
-        if (pfn >= max_pfn)
-                return 0;
-
-        asm volatile(
-                "       lra     %0,0(%2)\n"
-                "       ipm     %1\n"
-                "       srl     %1,28\n"
-                : "=d" (dummy), "=d" (ccode)
-                : "a" (pfn << PAGE_SHIFT)
-                : "cc");
-        return !ccode;
-}
-
 #endif /* !__ASSEMBLY__ */
 
 /* to align the pointer to the (next) page boundary */
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index fd336f2e2a7a..c7f4f8e3e297 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -129,7 +129,7 @@ extern char empty_zero_page[PAGE_SIZE];
 #define VMEM_MAX_PAGES  ((VMEM_MAP_END - VMALLOC_END) / sizeof(struct page))
 #define VMEM_MAX_PFN    min(VMALLOC_START >> PAGE_SHIFT, VMEM_MAX_PAGES)
 #define VMEM_MAX_PHYS   ((VMEM_MAX_PFN << PAGE_SHIFT) & ~((16 << 20) - 1))
-#define VMEM_MAP        ((struct page *) VMALLOC_END)
+#define vmemmap         ((struct page *) VMALLOC_END)
 
 /*
  * A 31 bit pagetable entry of S390 has following format:
@@ -1075,8 +1075,8 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
 
 #define kern_addr_valid(addr)   (1)
 
-extern int add_shared_memory(unsigned long start, unsigned long size);
-extern int remove_shared_memory(unsigned long start, unsigned long size);
+extern int vmem_add_mapping(unsigned long start, unsigned long size);
+extern int vmem_remove_mapping(unsigned long start, unsigned long size);
 extern int s390_enable_sie(void);
 
 /*
@@ -1084,9 +1084,6 @@ extern int s390_enable_sie(void);
  */
 #define pgtable_cache_init()    do { } while (0)
 
-#define __HAVE_ARCH_MEMMAP_INIT
-extern void memmap_init(unsigned long, int, unsigned long, unsigned long);
-
 #include <asm-generic/pgtable.h>
 
 #endif /* _S390_PAGE_H */
diff --git a/include/asm-s390/sparsemem.h b/include/asm-s390/sparsemem.h
new file mode 100644
index 000000000000..06dfdab6c0e8
--- /dev/null
+++ b/include/asm-s390/sparsemem.h
@@ -0,0 +1,18 @@
+#ifndef _ASM_S390_SPARSEMEM_H
+#define _ASM_S390_SPARSEMEM_H
+
+#define SECTION_SIZE_BITS       25
+
+#ifdef CONFIG_64BIT
+
+#define MAX_PHYSADDR_BITS       42
+#define MAX_PHYSMEM_BITS        42
+
+#else
+
+#define MAX_PHYSADDR_BITS       31
+#define MAX_PHYSMEM_BITS        31
+
+#endif /* CONFIG_64BIT */
+
+#endif /* _ASM_S390_SPARSEMEM_H */