7 files changed, 83 insertions, 165 deletions

diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index 8c21d378f5d2..778f22fd85d2 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -134,8 +134,10 @@ static void crash_kexec_prepare_cpus(void)
          * the crash CPU will send an IPI and wait for other CPUs to
          * respond. If not, proceed the kexec boot even though we failed to
          * capture other CPU states.
+         * Delay of at least 10 seconds.
          */
-        msecs = 1000000;
+        printk(KERN_ALERT "Sending IPI to other cpus...\n");
+        msecs = 10000;
         while ((atomic_read(&waiting_for_crash_ipi) > 0) && (--msecs > 0)) {
                 barrier();
                 mdelay(1);
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 03b25f9359f8..a0579e859b21 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -714,6 +714,7 @@ AltiVecUnavailable:
 #ifdef CONFIG_ALTIVEC
         bne     load_up_altivec         /* if from user, just load it up */
 #endif /* CONFIG_ALTIVEC */
+        addi    r3,r1,STACK_FRAME_OVERHEAD
         EXC_XFER_EE_LITE(0xf20, altivec_unavailable_exception)
 
 PerformanceMonitor:
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 2b03a09fe5e9..11f2cd5af7dc 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -139,7 +139,7 @@ _GLOBAL(__secondary_hold)
         ori     r24,r24,MSR_RI
         mtmsrd  r24                     /* RI on */
 
-        /* Grab our linux cpu number */
+        /* Grab our physical cpu number */
         mr      r24,r3
 
         /* Tell the master cpu we're here */
@@ -153,11 +153,7 @@ _GLOBAL(__secondary_hold)
         cmpdi   0,r4,1
         bne     100b
 
-#ifdef CONFIG_HMT
-        SET_REG_IMMEDIATE(r4, .hmt_init)
-        mtctr   r4
-        bctr
-#elif defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
+#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
         LOAD_REG_IMMEDIATE(r4, .pSeries_secondary_smp_init)
         mtctr   r4
         mr      r3,r24
@@ -319,7 +315,6 @@ exception_marker:
 label##_pSeries:                                        \
         HMT_MEDIUM;                                     \
         mtspr   SPRN_SPRG1,r13;         /* save r13 */  \
-        RUNLATCH_ON(r13);                               \
         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
 
 #define STD_EXCEPTION_ISERIES(n, label, area)           \
@@ -327,7 +322,6 @@ label##_pSeries:					\
 label##_iSeries:                                        \
         HMT_MEDIUM;                                     \
         mtspr   SPRN_SPRG1,r13;         /* save r13 */  \
-        RUNLATCH_ON(r13);                               \
         EXCEPTION_PROLOG_ISERIES_1(area);               \
         EXCEPTION_PROLOG_ISERIES_2;                     \
         b       label##_common
@@ -337,7 +331,6 @@ label##_iSeries:					\
 label##_iSeries:                                                        \
         HMT_MEDIUM;                                                     \
         mtspr   SPRN_SPRG1,r13;         /* save r13 */                  \
-        RUNLATCH_ON(r13);                                               \
         EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN);                         \
         lbz     r10,PACAPROCENABLED(r13);                               \
         cmpwi   0,r10,0;                                                \
@@ -390,6 +383,7 @@ label##_common:						\
 label##_common:                                         \
         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);      \
         DISABLE_INTS;                                   \
+        bl      .ppc64_runlatch_on;                     \
         addi    r3,r1,STACK_FRAME_OVERHEAD;             \
         bl      hdlr;                                   \
         b       .ret_from_except_lite
@@ -407,7 +401,6 @@ __start_interrupts:
 _machine_check_pSeries:
         HMT_MEDIUM
         mtspr   SPRN_SPRG1,r13          /* save r13 */
-        RUNLATCH_ON(r13)
         EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
 
         . = 0x300
@@ -434,7 +427,6 @@ END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
 data_access_slb_pSeries:
         HMT_MEDIUM
         mtspr   SPRN_SPRG1,r13
-        RUNLATCH_ON(r13)
         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
         std     r3,PACA_EXSLB+EX_R3(r13)
         mfspr   r3,SPRN_DAR
@@ -460,7 +452,6 @@ data_access_slb_pSeries:
 instruction_access_slb_pSeries:
         HMT_MEDIUM
         mtspr   SPRN_SPRG1,r13
-        RUNLATCH_ON(r13)
         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
         std     r3,PACA_EXSLB+EX_R3(r13)
         mfspr   r3,SPRN_SRR0            /* SRR0 is faulting address */
@@ -491,7 +482,6 @@ instruction_access_slb_pSeries:
         .globl  system_call_pSeries
 system_call_pSeries:
         HMT_MEDIUM
-        RUNLATCH_ON(r9)
         mr      r9,r13
         mfmsr   r10
         mfspr   r13,SPRN_SPRG3
@@ -575,7 +565,6 @@ slb_miss_user_pseries:
 system_reset_fwnmi:
         HMT_MEDIUM
         mtspr   SPRN_SPRG1,r13          /* save r13 */
-        RUNLATCH_ON(r13)
         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
 
         .globl machine_check_fwnmi
@@ -583,7 +572,6 @@ system_reset_fwnmi:
 machine_check_fwnmi:
         HMT_MEDIUM
         mtspr   SPRN_SPRG1,r13          /* save r13 */
-        RUNLATCH_ON(r13)
         EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
 
 #ifdef CONFIG_PPC_ISERIES
@@ -894,7 +882,6 @@ unrecov_fer:
         .align  7
         .globl data_access_common
 data_access_common:
-        RUNLATCH_ON(r10)                /* It wont fit in the 0x300 handler */
         mfspr   r10,SPRN_DAR
         std     r10,PACA_EXGEN+EX_DAR(r13)
         mfspr   r10,SPRN_DSISR
@@ -1042,6 +1029,7 @@ hardware_interrupt_common:
         EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN)
 hardware_interrupt_entry:
         DISABLE_INTS
+        bl      .ppc64_runlatch_on
         addi    r3,r1,STACK_FRAME_OVERHEAD
         bl      .do_IRQ
         b       .ret_from_except_lite
@@ -1816,22 +1804,6 @@ _STATIC(start_here_multiplatform)
         ori     r6,r6,MSR_RI
         mtmsrd  r6                      /* RI on */
 
-#ifdef CONFIG_HMT
-        /* Start up the second thread on cpu 0 */
-        mfspr   r3,SPRN_PVR
-        srwi    r3,r3,16
-        cmpwi   r3,0x34                 /* Pulsar  */
-        beq     90f
-        cmpwi   r3,0x36                 /* Icestar */
-        beq     90f
-        cmpwi   r3,0x37                 /* SStar   */
-        beq     90f
-        b       91f                     /* HMT not supported */
-90:     li      r3,0
-        bl      .hmt_start_secondary
-91:
-#endif
-
         /* The following gets the stack and TOC set up with the regs */
         /* pointing to the real addr of the kernel stack.  This is   */
         /* all done to support the C function call below which sets  */
@@ -1945,77 +1917,8 @@ _STATIC(start_here_common)
 
         bl .start_kernel
 
-_GLOBAL(hmt_init)
-#ifdef CONFIG_HMT
-        LOAD_REG_IMMEDIATE(r5, hmt_thread_data)
-        mfspr   r7,SPRN_PVR
-        srwi    r7,r7,16
-        cmpwi   r7,0x34                 /* Pulsar  */
-        beq     90f
-        cmpwi   r7,0x36                 /* Icestar */
-        beq     91f
-        cmpwi   r7,0x37                 /* SStar   */
-        beq     91f
-        b       101f
-90:     mfspr   r6,SPRN_PIR
-        andi.   r6,r6,0x1f
-        b       92f
-91:     mfspr   r6,SPRN_PIR
-        andi.   r6,r6,0x3ff
-92:     sldi    r4,r24,3
-        stwx    r6,r5,r4
-        bl      .hmt_start_secondary
-        b       101f
-
-__hmt_secondary_hold:
-        LOAD_REG_IMMEDIATE(r5, hmt_thread_data)
-        clrldi  r5,r5,4
-        li      r7,0
-        mfspr   r6,SPRN_PIR
-        mfspr   r8,SPRN_PVR
-        srwi    r8,r8,16
-        cmpwi   r8,0x34
-        bne     93f
-        andi.   r6,r6,0x1f
-        b       103f
-93:     andi.   r6,r6,0x3f
-
-103:    lwzx    r8,r5,r7
-        cmpw    r8,r6
-        beq     104f
-        addi    r7,r7,8
-        b       103b
-
-104:    addi    r7,r7,4
-        lwzx    r9,r5,r7
-        mr      r24,r9
-101:
-#endif
-        mr      r3,r24
-        b       .pSeries_secondary_smp_init
-
-#ifdef CONFIG_HMT
-_GLOBAL(hmt_start_secondary)
-        LOAD_REG_IMMEDIATE(r4,__hmt_secondary_hold)
-        clrldi  r4,r4,4
-        mtspr   SPRN_NIADORM, r4
-        mfspr   r4, SPRN_MSRDORM
-        li      r5, -65
-        and     r4, r4, r5
-        mtspr   SPRN_MSRDORM, r4
-        lis     r4,0xffef
-        ori     r4,r4,0x7403
-        mtspr   SPRN_TSC, r4
-        li      r4,0x1f4
-        mtspr   SPRN_TST, r4
-        mfspr   r4, SPRN_HID0
-        ori     r4, r4, 0x1
-        mtspr   SPRN_HID0, r4
-        mfspr   r4, SPRN_CTRLF
-        oris    r4, r4, 0x40
-        mtspr   SPRN_CTRLT, r4
-        blr
-#endif
+        /* Not reached */
+        BUG_OPCODE
 
 /*
  * We put a few things here that have to be page-aligned.
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index d6431440c54f..ee166c586642 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -26,8 +26,6 @@
 #include <asm/prom.h>
 #include <asm/smp.h>
 
-#define HASH_GROUP_SIZE 0x80    /* size of each hash group, asm/mmu.h */
-
 int default_machine_kexec_prepare(struct kimage *image)
 {
         int i;
@@ -61,7 +59,7 @@ int default_machine_kexec_prepare(struct kimage *image)
          */
         if (htab_address) {
                 low = __pa(htab_address);
-                high = low + (htab_hash_mask + 1) * HASH_GROUP_SIZE;
+                high = low + htab_size_bytes;
 
                 for (i = 0; i < image->nr_segments; i++) {
                         begin = image->segment[i].mem;
@@ -294,7 +292,7 @@ void default_machine_kexec(struct kimage *image)
 }
 
 /* Values we need to export to the second kernel via the device tree. */
-static unsigned long htab_base, htab_size, kernel_end;
+static unsigned long htab_base, kernel_end;
 
 static struct property htab_base_prop = {
         .name = "linux,htab-base",
@@ -305,7 +303,7 @@ static struct property htab_base_prop = {
 static struct property htab_size_prop = {
         .name = "linux,htab-size",
         .length = sizeof(unsigned long),
-        .value = (unsigned char *)&htab_size,
+        .value = (unsigned char *)&htab_size_bytes,
 };
 
 static struct property kernel_end_prop = {
@@ -331,8 +329,6 @@ static void __init export_htab_values(void)
 
         htab_base = __pa(htab_address);
         prom_add_property(node, &htab_base_prop);
-
-        htab_size = 1UL << ppc64_pft_size;
         prom_add_property(node, &htab_size_prop);
 
  out:
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 57703994a063..c225cf154bfe 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -888,3 +888,35 @@ void dump_stack(void)
         show_stack(current, NULL);
 }
 EXPORT_SYMBOL(dump_stack);
+
+#ifdef CONFIG_PPC64
+void ppc64_runlatch_on(void)
+{
+        unsigned long ctrl;
+
+        if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) {
+                HMT_medium();
+
+                ctrl = mfspr(SPRN_CTRLF);
+                ctrl |= CTRL_RUNLATCH;
+                mtspr(SPRN_CTRLT, ctrl);
+
+                set_thread_flag(TIF_RUNLATCH);
+        }
+}
+
+void ppc64_runlatch_off(void)
+{
+        unsigned long ctrl;
+
+        if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) {
+                HMT_medium();
+
+                clear_thread_flag(TIF_RUNLATCH);
+
+                ctrl = mfspr(SPRN_CTRLF);
+                ctrl &= ~CTRL_RUNLATCH;
+                mtspr(SPRN_CTRLT, ctrl);
+        }
+}
+#endif
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 294832a7e0a6..6dbd21726770 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -816,8 +816,6 @@ void __init unflatten_device_tree(void)
 {
         unsigned long start, mem, size;
         struct device_node **allnextp = &allnodes;
-        char *p = NULL;
-        int l = 0;
 
         DBG(" -> unflatten_device_tree()\n");
 
@@ -857,19 +855,6 @@ void __init unflatten_device_tree(void)
         if (of_chosen == NULL)
                 of_chosen = of_find_node_by_path("/chosen@0");
 
-        /* Retreive command line */
-        if (of_chosen != NULL) {
-                p = (char *)get_property(of_chosen, "bootargs", &l);
-                if (p != NULL && l > 0)
-                        strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE));
-        }
-#ifdef CONFIG_CMDLINE
-        if (l == 0 || (l == 1 && (*p) == 0))
-                strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
-#endif /* CONFIG_CMDLINE */
-
-        DBG("Command line is: %s\n", cmd_line);
-
         DBG(" <- unflatten_device_tree()\n");
 }
 
@@ -940,6 +925,8 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
 {
         u32 *prop;
         unsigned long *lprop;
+        unsigned long l;
+        char *p;
 
         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 
@@ -1004,6 +991,41 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
                crashk_res.end = crashk_res.start + *lprop - 1;
 #endif
 
+        /* Retreive command line */
+        p = of_get_flat_dt_prop(node, "bootargs", &l);
+        if (p != NULL && l > 0)
+                strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
+
+#ifdef CONFIG_CMDLINE
+        if (l == 0 || (l == 1 && (*p) == 0))
+                strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#endif /* CONFIG_CMDLINE */
+
+        DBG("Command line is: %s\n", cmd_line);
+
+        if (strstr(cmd_line, "mem=")) {
+                char *p, *q;
+                unsigned long maxmem = 0;
+
+                for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) {
+                        q = p + 4;
+                        if (p > cmd_line && p[-1] != ' ')
+                                continue;
+                        maxmem = simple_strtoul(q, &q, 0);
+                        if (*q == 'k' || *q == 'K') {
+                                maxmem <<= 10;
+                                ++q;
+                        } else if (*q == 'm' || *q == 'M') {
+                                maxmem <<= 20;
+                                ++q;
+                        } else if (*q == 'g' || *q == 'G') {
+                                maxmem <<= 30;
+                                ++q;
+                        }
+                }
+                memory_limit = maxmem;
+        }
+
         /* break now */
         return 1;
 }
@@ -1124,7 +1146,7 @@ static void __init early_reserve_mem(void)
                         size_32 = *(reserve_map_32++);
                         if (size_32 == 0)
                                 break;
-                        DBG("reserving: %lx -> %lx\n", base_32, size_32);
+                        DBG("reserving: %x -> %x\n", base_32, size_32);
                         lmb_reserve(base_32, size_32);
                 }
                 return;
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index ec7153f4d47c..d34fe537400e 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -205,14 +205,6 @@ static cell_t __initdata regbuf[1024];
 
 #define MAX_CPU_THREADS 2
 
-/* TO GO */
-#ifdef CONFIG_HMT
-struct {
-        unsigned int pir;
-        unsigned int threadid;
-} hmt_thread_data[NR_CPUS];
-#endif /* CONFIG_HMT */
-
 /*
  * Error results ... some OF calls will return "-1" on error, some
  * will return 0, some will return either. To simplify, here are
@@ -1319,10 +1311,6 @@ static void __init prom_hold_cpus(void)
          */
         *spinloop = 0;
 
-#ifdef CONFIG_HMT
-        for (i = 0; i < NR_CPUS; i++)
-                RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
-#endif
         /* look for cpus */
         for (node = 0; prom_next_node(&node); ) {
                 type[0] = 0;
@@ -1389,32 +1377,6 @@ static void __init prom_hold_cpus(void)
                 /* Reserve cpu #s for secondary threads.   They start later. */
                 cpuid += cpu_threads;
         }
-#ifdef CONFIG_HMT
-        /* Only enable HMT on processors that provide support. */
-        if (__is_processor(PV_PULSAR) || 
-            __is_processor(PV_ICESTAR) ||
-            __is_processor(PV_SSTAR)) {
-                prom_printf("    starting secondary threads\n");
-
-                for (i = 0; i < NR_CPUS; i += 2) {
-                        if (!cpu_online(i))
-                                continue;
-
-                        if (i == 0) {
-                                unsigned long pir = mfspr(SPRN_PIR);
-                                if (__is_processor(PV_PULSAR)) {
-                                        RELOC(hmt_thread_data)[i].pir = 
-                                                pir & 0x1f;
-                                } else {
-                                        RELOC(hmt_thread_data)[i].pir = 
-                                                pir & 0x3ff;
-                                }
-                        }
-                }
-        } else {
-                prom_printf("Processor is not HMT capable\n");
-        }
-#endif
 
         if (cpuid > NR_CPUS)
                 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)