sh: convert kexec crash kernel management to LMB.

This migrates the crash kernel handling off of bootmem and over to LMB.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 58 insertions, 44 deletions

diff --git a/arch/sh/include/asm/kexec.h b/arch/sh/include/asm/kexec.h
index 765a5e1660fc..ad6ef8a275ee 100644
--- a/arch/sh/include/asm/kexec.h
+++ b/arch/sh/include/asm/kexec.h
@@ -26,6 +26,10 @@
 /* The native architecture */
 #define KEXEC_ARCH KEXEC_ARCH_SH
 
+#ifdef CONFIG_KEXEC
+/* arch/sh/kernel/machine_kexec.c */
+void reserve_crashkernel(void);
+
 static inline void crash_setup_regs(struct pt_regs *newregs,
                                     struct pt_regs *oldregs)
 {
@@ -59,4 +63,8 @@ static inline void crash_setup_regs(struct pt_regs *newregs,
                 newregs->pc = (unsigned long)current_text_addr();
         }
 }
+#else
+static inline void reserve_crashkernel(void) { }
+#endif /* CONFIG_KEXEC */
+
 #endif /* __ASM_SH_KEXEC_H */
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
index 7672141c841b..f0f049caa6e2 100644
--- a/arch/sh/kernel/machine_kexec.c
+++ b/arch/sh/kernel/machine_kexec.c
@@ -8,7 +8,6 @@
  * This source code is licensed under the GNU General Public License,
  * Version 2.  See the file COPYING for more details.
  */
-
 #include <linux/mm.h>
 #include <linux/kexec.h>
 #include <linux/delay.h>
@@ -16,6 +15,7 @@
 #include <linux/numa.h>
 #include <linux/ftrace.h>
 #include <linux/suspend.h>
+#include <linux/lmb.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
 #include <asm/mmu_context.h>
@@ -148,3 +148,52 @@ void arch_crash_save_vmcoreinfo(void)
         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
 #endif
 }
+
+void __init reserve_crashkernel(void)
+{
+        unsigned long long crash_size, crash_base;
+        int ret;
+
+        /* this is necessary because of lmb_phys_mem_size() */
+        lmb_analyze();
+
+        ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
+                        &crash_size, &crash_base);
+        if (ret == 0 && crash_size > 0) {
+                crashk_res.start = crash_base;
+                crashk_res.end = crash_base + crash_size - 1;
+        }
+
+        if (crashk_res.end == crashk_res.start)
+                goto disable;
+
+        crash_size = PAGE_ALIGN(crashk_res.end - crashk_res.start + 1);
+        if (!crashk_res.start) {
+                crashk_res.start = lmb_alloc(crash_size, PAGE_SIZE);
+                if (!crashk_res.start) {
+                        pr_err("crashkernel allocation failed\n");
+                        goto disable;
+                }
+        } else {
+                ret = lmb_reserve(crashk_res.start, crash_size);
+                if (unlikely(ret < 0)) {
+                        pr_err("crashkernel reservation failed - "
+                               "memory is in use\n");
+                        goto disable;
+                }
+        }
+
+        pr_info("Reserving %ldMB of memory at %ldMB "
+                "for crashkernel (System RAM: %ldMB)\n",
+                (unsigned long)(crash_size >> 20),
+                (unsigned long)(crashk_res.start >> 20),
+                (unsigned long)(lmb_phys_mem_size() >> 20));
+
+        crashk_res.end = crashk_res.start + crash_size - 1;
+        insert_resource(&iomem_resource, &crashk_res);
+
+        return;
+
+disable:
+        crashk_res.start = crashk_res.end = 0;
+}
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 9c7f7811af70..d67a8a386907 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -145,49 +145,6 @@ static void __init register_bootmem_low_pages(void)
         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 }
 
-#ifdef CONFIG_KEXEC
-static void __init reserve_crashkernel(void)
-{
-        unsigned long long free_mem;
-        unsigned long long crash_size, crash_base;
-        void *vp;
-        int ret;
-
-        free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
-
-        ret = parse_crashkernel(boot_command_line, free_mem,
-                        &crash_size, &crash_base);
-        if (ret == 0 && crash_size) {
-                if (crash_base <= 0) {
-                        vp = alloc_bootmem_nopanic(crash_size);
-                        if (!vp) {
-                                printk(KERN_INFO "crashkernel allocation "
-                                       "failed\n");
-                                return;
-                        }
-                        crash_base = __pa(vp);
-                } else if (reserve_bootmem(crash_base, crash_size,
-                                        BOOTMEM_EXCLUSIVE) < 0) {
-                        printk(KERN_INFO "crashkernel reservation failed - "
-                                        "memory is in use\n");
-                        return;
-                }
-
-                printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
-                                "for crashkernel (System RAM: %ldMB)\n",
-                                (unsigned long)(crash_size >> 20),
-                                (unsigned long)(crash_base >> 20),
-                                (unsigned long)(free_mem >> 20));
-                crashk_res.start = crash_base;
-                crashk_res.end   = crash_base + crash_size - 1;
-                insert_resource(&iomem_resource, &crashk_res);
-        }
-}
-#else
-static inline void __init reserve_crashkernel(void)
-{}
-#endif
-
 static void __init check_for_initrd(void)
 {
 #ifdef CONFIG_BLK_DEV_INITRD