Merge master.kernel.org:/home/rmk/linux-2.6-arm

* master.kernel.org:/home/rmk/linux-2.6-arm:
  ARM: 5974/1: arm/mach-at91 Makefile: remove two blanks.
  ARM: 6052/1: kdump: make kexec work in interrupt context
  ARM: 6051/1: VFP: preserve the HW context when calling signal handlers
  ARM: 6050/1: VFP: fix the SMP versions of vfp_{sync,flush}_hwstate
  ARM: 6007/1: fix highmem with VIPT cache and DMA
  ARM: 5975/1: AT91 slow-clock suspend: don't wait when turning PLLs off

13 files changed, 251 insertions, 68 deletions

diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h
index 7f36d00600b4..feb988a7ec37 100644
--- a/arch/arm/include/asm/highmem.h
+++ b/arch/arm/include/asm/highmem.h
@@ -11,7 +11,11 @@
 
 #define kmap_prot               PAGE_KERNEL
 
-#define flush_cache_kmaps()     flush_cache_all()
+#define flush_cache_kmaps() \
+        do { \
+                if (cache_is_vivt()) \
+                        flush_cache_all(); \
+        } while (0)
 
 extern pte_t *pkmap_page_table;
 
@@ -21,11 +25,20 @@ extern void *kmap_high(struct page *page);
 extern void *kmap_high_get(struct page *page);
 extern void kunmap_high(struct page *page);
 
+extern void *kmap_high_l1_vipt(struct page *page, pte_t *saved_pte);
+extern void kunmap_high_l1_vipt(struct page *page, pte_t saved_pte);
+
+/*
+ * The following functions are already defined by <linux/highmem.h>
+ * when CONFIG_HIGHMEM is not set.
+ */
+#ifdef CONFIG_HIGHMEM
 extern void *kmap(struct page *page);
 extern void kunmap(struct page *page);
 extern void *kmap_atomic(struct page *page, enum km_type type);
 extern void kunmap_atomic(void *kvaddr, enum km_type type);
 extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
 extern struct page *kmap_atomic_to_page(const void *ptr);
+#endif
 
 #endif
diff --git a/arch/arm/include/asm/kmap_types.h b/arch/arm/include/asm/kmap_types.h
index c019949a5189..c4b2ea3fbe42 100644
--- a/arch/arm/include/asm/kmap_types.h
+++ b/arch/arm/include/asm/kmap_types.h
@@ -18,6 +18,7 @@ enum km_type {
         KM_IRQ1,
         KM_SOFTIRQ0,
         KM_SOFTIRQ1,
+        KM_L1_CACHE,
         KM_L2_CACHE,
         KM_TYPE_NR
 };
diff --git a/arch/arm/include/asm/ucontext.h b/arch/arm/include/asm/ucontext.h
index bf65e9f4525d..47f023aa8495 100644
--- a/arch/arm/include/asm/ucontext.h
+++ b/arch/arm/include/asm/ucontext.h
@@ -59,23 +59,22 @@ struct iwmmxt_sigframe {
 #endif /* CONFIG_IWMMXT */
 
 #ifdef CONFIG_VFP
-#if __LINUX_ARM_ARCH__ < 6
-/* For ARM pre-v6, we use fstmiax and fldmiax.  This adds one extra
- * word after the registers, and a word of padding at the end for
- * alignment.  */
 #define VFP_MAGIC               0x56465001
-#define VFP_STORAGE_SIZE        152
-#else
-#define VFP_MAGIC               0x56465002
-#define VFP_STORAGE_SIZE        144
-#endif
 
 struct vfp_sigframe
 {
         unsigned long           magic;
         unsigned long           size;
-        union vfp_state         storage;
-};
+        struct user_vfp         ufp;
+        struct user_vfp_exc     ufp_exc;
+} __attribute__((__aligned__(8)));
+
+/*
+ *  8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
+ *  4 bytes padding.
+ */
+#define VFP_STORAGE_SIZE        sizeof(struct vfp_sigframe)
+
 #endif /* CONFIG_VFP */
 
 /*
@@ -91,7 +90,7 @@ struct aux_sigframe {
 #ifdef CONFIG_IWMMXT
         struct iwmmxt_sigframe  iwmmxt;
 #endif
-#if 0 && defined CONFIG_VFP /* Not yet saved.  */
+#ifdef CONFIG_VFP
         struct vfp_sigframe     vfp;
 #endif
         /* Something that isn't a valid magic number for any coprocessor.  */
diff --git a/arch/arm/include/asm/user.h b/arch/arm/include/asm/user.h
index df95e050f9dd..05ac4b06876a 100644
--- a/arch/arm/include/asm/user.h
+++ b/arch/arm/include/asm/user.h
@@ -83,11 +83,21 @@ struct user{
 
 /*
  * User specific VFP registers. If only VFPv2 is present, registers 16 to 31
- * are ignored by the ptrace system call.
+ * are ignored by the ptrace system call and the signal handler.
  */
 struct user_vfp {
         unsigned long long fpregs[32];
         unsigned long fpscr;
 };
 
+/*
+ * VFP exception registers exposed to user space during signal delivery.
+ * Fields not relavant to the current VFP architecture are ignored.
+ */
+struct user_vfp_exc {
+        unsigned long   fpexc;
+        unsigned long   fpinst;
+        unsigned long   fpinst2;
+};
+
 #endif /* _ARM_USER_H */
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index e7714f367eb8..907d5a620bca 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -18,6 +18,7 @@
 #include <asm/cacheflush.h>
 #include <asm/ucontext.h>
 #include <asm/unistd.h>
+#include <asm/vfp.h>
 
 #include "ptrace.h"
 #include "signal.h"
@@ -175,6 +176,90 @@ static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
 
 #endif
 
+#ifdef CONFIG_VFP
+
+static int preserve_vfp_context(struct vfp_sigframe __user *frame)
+{
+        struct thread_info *thread = current_thread_info();
+        struct vfp_hard_struct *h = &thread->vfpstate.hard;
+        const unsigned long magic = VFP_MAGIC;
+        const unsigned long size = VFP_STORAGE_SIZE;
+        int err = 0;
+
+        vfp_sync_hwstate(thread);
+        __put_user_error(magic, &frame->magic, err);
+        __put_user_error(size, &frame->size, err);
+
+        /*
+         * Copy the floating point registers. There can be unused
+         * registers see asm/hwcap.h for details.
+         */
+        err |= __copy_to_user(&frame->ufp.fpregs, &h->fpregs,
+                              sizeof(h->fpregs));
+        /*
+         * Copy the status and control register.
+         */
+        __put_user_error(h->fpscr, &frame->ufp.fpscr, err);
+
+        /*
+         * Copy the exception registers.
+         */
+        __put_user_error(h->fpexc, &frame->ufp_exc.fpexc, err);
+        __put_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
+        __put_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
+
+        return err ? -EFAULT : 0;
+}
+
+static int restore_vfp_context(struct vfp_sigframe __user *frame)
+{
+        struct thread_info *thread = current_thread_info();
+        struct vfp_hard_struct *h = &thread->vfpstate.hard;
+        unsigned long magic;
+        unsigned long size;
+        unsigned long fpexc;
+        int err = 0;
+
+        __get_user_error(magic, &frame->magic, err);
+        __get_user_error(size, &frame->size, err);
+
+        if (err)
+                return -EFAULT;
+        if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
+                return -EINVAL;
+
+        /*
+         * Copy the floating point registers. There can be unused
+         * registers see asm/hwcap.h for details.
+         */
+        err |= __copy_from_user(&h->fpregs, &frame->ufp.fpregs,
+                                sizeof(h->fpregs));
+        /*
+         * Copy the status and control register.
+         */
+        __get_user_error(h->fpscr, &frame->ufp.fpscr, err);
+
+        /*
+         * Sanitise and restore the exception registers.
+         */
+        __get_user_error(fpexc, &frame->ufp_exc.fpexc, err);
+        /* Ensure the VFP is enabled. */
+        fpexc |= FPEXC_EN;
+        /* Ensure FPINST2 is invalid and the exception flag is cleared. */
+        fpexc &= ~(FPEXC_EX | FPEXC_FP2V);
+        h->fpexc = fpexc;
+
+        __get_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
+        __get_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
+
+        if (!err)
+                vfp_flush_hwstate(thread);
+
+        return err ? -EFAULT : 0;
+}
+
+#endif
+
 /*
  * Do a signal return; undo the signal stack.  These are aligned to 64-bit.
  */
@@ -233,8 +318,8 @@ static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
                 err |= restore_iwmmxt_context(&aux->iwmmxt);
 #endif
 #ifdef CONFIG_VFP
-//      if (err == 0)
-//              err |= vfp_restore_state(&sf->aux.vfp);
+        if (err == 0)
+                err |= restore_vfp_context(&aux->vfp);
 #endif
 
         return err;
@@ -348,8 +433,8 @@ setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
                 err |= preserve_iwmmxt_context(&aux->iwmmxt);
 #endif
 #ifdef CONFIG_VFP
-//      if (err == 0)
-//              err |= vfp_save_state(&sf->aux.vfp);
+        if (err == 0)
+                err |= preserve_vfp_context(&aux->vfp);
 #endif
         __put_user_error(0, &aux->end_magic, err);
 
diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
index 027dd570dcc3..d4004557532a 100644
--- a/arch/arm/mach-at91/Makefile
+++ b/arch/arm/mach-at91/Makefile
@@ -16,8 +16,8 @@ obj-$(CONFIG_ARCH_AT91SAM9261)	+= at91sam9261.o at91sam926x_time.o at91sam9261_d
 obj-$(CONFIG_ARCH_AT91SAM9G10)  += at91sam9261.o at91sam926x_time.o at91sam9261_devices.o sam9_smc.o
 obj-$(CONFIG_ARCH_AT91SAM9263)  += at91sam9263.o at91sam926x_time.o at91sam9263_devices.o sam9_smc.o
 obj-$(CONFIG_ARCH_AT91SAM9RL)   += at91sam9rl.o at91sam926x_time.o at91sam9rl_devices.o sam9_smc.o
-obj-$(CONFIG_ARCH_AT91SAM9G20)  += at91sam9260.o at91sam926x_time.o at91sam9260_devices.o  sam9_smc.o
- obj-$(CONFIG_ARCH_AT91SAM9G45) += at91sam9g45.o at91sam926x_time.o at91sam9g45_devices.o sam9_smc.o
+obj-$(CONFIG_ARCH_AT91SAM9G20)  += at91sam9260.o at91sam926x_time.o at91sam9260_devices.o sam9_smc.o
+obj-$(CONFIG_ARCH_AT91SAM9G45)  += at91sam9g45.o at91sam926x_time.o at91sam9g45_devices.o sam9_smc.o
 obj-$(CONFIG_ARCH_AT91CAP9)     += at91cap9.o at91sam926x_time.o at91cap9_devices.o sam9_smc.o
 obj-$(CONFIG_ARCH_AT572D940HF)  += at572d940hf.o at91sam926x_time.o at572d940hf_devices.o sam9_smc.o
 obj-$(CONFIG_ARCH_AT91X40)      += at91x40.o at91x40_time.o
diff --git a/arch/arm/mach-at91/pm_slowclock.S b/arch/arm/mach-at91/pm_slowclock.S
index 9fcbd6ca0090..9c5b48e68a71 100644
--- a/arch/arm/mach-at91/pm_slowclock.S
+++ b/arch/arm/mach-at91/pm_slowclock.S
@@ -175,8 +175,6 @@ ENTRY(at91_slow_clock)
         orr     r3, r3, #(1 << 29)              /* bit 29 always set */
         str     r3, [r1, #(AT91_CKGR_PLLAR - AT91_PMC)]
 
-        wait_pllalock
-
         /* Save PLLB setting and disable it */
         ldr     r3, [r1, #(AT91_CKGR_PLLBR - AT91_PMC)]
         str     r3, .saved_pllbr
@@ -184,8 +182,6 @@ ENTRY(at91_slow_clock)
         mov     r3, #AT91_PMC_PLLCOUNT
         str     r3, [r1, #(AT91_CKGR_PLLBR - AT91_PMC)]
 
-        wait_pllblock
-
         /* Turn off the main oscillator */
         ldr     r3, [r1, #(AT91_CKGR_MOR - AT91_PMC)]
         bic     r3, r3, #AT91_PMC_MOSCEN
diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c
index 8bca4dea6dfa..f55fa1044f72 100644
--- a/arch/arm/mm/copypage-v6.c
+++ b/arch/arm/mm/copypage-v6.c
@@ -41,14 +41,7 @@ static void v6_copy_user_highpage_nonaliasing(struct page *to,
         kfrom = kmap_atomic(from, KM_USER0);
         kto = kmap_atomic(to, KM_USER1);
         copy_page(kto, kfrom);
-#ifdef CONFIG_HIGHMEM
-        /*
-         * kmap_atomic() doesn't set the page virtual address, and
-         * kunmap_atomic() takes care of cache flushing already.
-         */
-        if (page_address(to) != NULL)
-#endif
-                __cpuc_flush_dcache_area(kto, PAGE_SIZE);
+        __cpuc_flush_dcache_area(kto, PAGE_SIZE);
         kunmap_atomic(kto, KM_USER1);
         kunmap_atomic(kfrom, KM_USER0);
 }
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 1351edc0b26f..13fa536d82e6 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -464,6 +464,11 @@ static void dma_cache_maint_page(struct page *page, unsigned long offset,
                                 vaddr += offset;
                                 op(vaddr, len, dir);
                                 kunmap_high(page);
+                        } else if (cache_is_vipt()) {
+                                pte_t saved_pte;
+                                vaddr = kmap_high_l1_vipt(page, &saved_pte);
+                                op(vaddr + offset, len, dir);
+                                kunmap_high_l1_vipt(page, saved_pte);
                         }
                 } else {
                         vaddr = page_address(page) + offset;
diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c
index e34f095e2090..c6844cb9b508 100644
--- a/arch/arm/mm/flush.c
+++ b/arch/arm/mm/flush.c
@@ -13,6 +13,7 @@
 
 #include <asm/cacheflush.h>
 #include <asm/cachetype.h>
+#include <asm/highmem.h>
 #include <asm/smp_plat.h>
 #include <asm/system.h>
 #include <asm/tlbflush.h>
@@ -152,21 +153,25 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 
 void __flush_dcache_page(struct address_space *mapping, struct page *page)
 {
-        void *addr = page_address(page);
-
         /*
          * Writeback any data associated with the kernel mapping of this
          * page.  This ensures that data in the physical page is mutually
          * coherent with the kernels mapping.
          */
-#ifdef CONFIG_HIGHMEM
-        /*
-         * kmap_atomic() doesn't set the page virtual address, and
-         * kunmap_atomic() takes care of cache flushing already.
-         */
-        if (addr)
-#endif
-                __cpuc_flush_dcache_area(addr, PAGE_SIZE);
+        if (!PageHighMem(page)) {
+                __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
+        } else {
+                void *addr = kmap_high_get(page);
+                if (addr) {
+                        __cpuc_flush_dcache_area(addr, PAGE_SIZE);
+                        kunmap_high(page);
+                } else if (cache_is_vipt()) {
+                        pte_t saved_pte;
+                        addr = kmap_high_l1_vipt(page, &saved_pte);
+                        __cpuc_flush_dcache_area(addr, PAGE_SIZE);
+                        kunmap_high_l1_vipt(page, saved_pte);
+                }
+        }
 
         /*
          * If this is a page cache page, and we have an aliasing VIPT cache,
diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c
index 2be1ec7c1b41..77b030f5ec09 100644
--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -79,7 +79,8 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
         unsigned int idx = type + KM_TYPE_NR * smp_processor_id();
 
         if (kvaddr >= (void *)FIXADDR_START) {
-                __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
+                if (cache_is_vivt())
+                        __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
 #ifdef CONFIG_DEBUG_HIGHMEM
                 BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
                 set_pte_ext(TOP_PTE(vaddr), __pte(0), 0);
@@ -124,3 +125,87 @@ struct page *kmap_atomic_to_page(const void *ptr)
         pte = TOP_PTE(vaddr);
         return pte_page(*pte);
 }
+
+#ifdef CONFIG_CPU_CACHE_VIPT
+
+#include <linux/percpu.h>
+
+/*
+ * The VIVT cache of a highmem page is always flushed before the page
+ * is unmapped. Hence unmapped highmem pages need no cache maintenance
+ * in that case.
+ *
+ * However unmapped pages may still be cached with a VIPT cache, and
+ * it is not possible to perform cache maintenance on them using physical
+ * addresses unfortunately.  So we have no choice but to set up a temporary
+ * virtual mapping for that purpose.
+ *
+ * Yet this VIPT cache maintenance may be triggered from DMA support
+ * functions which are possibly called from interrupt context. As we don't
+ * want to keep interrupt disabled all the time when such maintenance is
+ * taking place, we therefore allow for some reentrancy by preserving and
+ * restoring the previous fixmap entry before the interrupted context is
+ * resumed.  If the reentrancy depth is 0 then there is no need to restore
+ * the previous fixmap, and leaving the current one in place allow it to
+ * be reused the next time without a TLB flush (common with DMA).
+ */
+
+static DEFINE_PER_CPU(int, kmap_high_l1_vipt_depth);
+
+void *kmap_high_l1_vipt(struct page *page, pte_t *saved_pte)
+{
+        unsigned int idx, cpu = smp_processor_id();
+        int *depth = &per_cpu(kmap_high_l1_vipt_depth, cpu);
+        unsigned long vaddr, flags;
+        pte_t pte, *ptep;
+
+        idx = KM_L1_CACHE + KM_TYPE_NR * cpu;
+        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+        ptep = TOP_PTE(vaddr);
+        pte = mk_pte(page, kmap_prot);
+
+        if (!in_interrupt())
+                preempt_disable();
+
+        raw_local_irq_save(flags);
+        (*depth)++;
+        if (pte_val(*ptep) == pte_val(pte)) {
+                *saved_pte = pte;
+        } else {
+                *saved_pte = *ptep;
+                set_pte_ext(ptep, pte, 0);
+                local_flush_tlb_kernel_page(vaddr);
+        }
+        raw_local_irq_restore(flags);
+
+        return (void *)vaddr;
+}
+
+void kunmap_high_l1_vipt(struct page *page, pte_t saved_pte)
+{
+        unsigned int idx, cpu = smp_processor_id();
+        int *depth = &per_cpu(kmap_high_l1_vipt_depth, cpu);
+        unsigned long vaddr, flags;
+        pte_t pte, *ptep;
+
+        idx = KM_L1_CACHE + KM_TYPE_NR * cpu;
+        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+        ptep = TOP_PTE(vaddr);
+        pte = mk_pte(page, kmap_prot);
+
+        BUG_ON(pte_val(*ptep) != pte_val(pte));
+        BUG_ON(*depth <= 0);
+
+        raw_local_irq_save(flags);
+        (*depth)--;
+        if (*depth != 0 && pte_val(pte) != pte_val(saved_pte)) {
+                set_pte_ext(ptep, saved_pte, 0);
+                local_flush_tlb_kernel_page(vaddr);
+        }
+        raw_local_irq_restore(flags);
+
+        if (!in_interrupt())
+                preempt_enable();
+}
+
+#endif  /* CONFIG_CPU_CACHE_VIPT */
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4223d086aa17..241c24a1c18f 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1054,10 +1054,12 @@ void setup_mm_for_reboot(char mode)
         pgd_t *pgd;
         int i;
 
-        if (current->mm && current->mm->pgd)
-                pgd = current->mm->pgd;
-        else
-                pgd = init_mm.pgd;
+        /*
+         * We need to access to user-mode page tables here. For kernel threads
+         * we don't have any user-mode mappings so we use the context that we
+         * "borrowed".
+         */
+        pgd = current->active_mm->pgd;
 
         base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT;
         if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index a420cb949328..315a540c7ce5 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -428,26 +428,6 @@ static void vfp_pm_init(void)
 static inline void vfp_pm_init(void) { }
 #endif /* CONFIG_PM */
 
-/*
- * Synchronise the hardware VFP state of a thread other than current with the
- * saved one. This function is used by the ptrace mechanism.
- */
-#ifdef CONFIG_SMP
-void vfp_sync_hwstate(struct thread_info *thread)
-{
-}
-
-void vfp_flush_hwstate(struct thread_info *thread)
-{
-        /*
-         * On SMP systems, the VFP state is automatically saved at every
-         * context switch. We mark the thread VFP state as belonging to a
-         * non-existent CPU so that the saved one will be reloaded when
-         * needed.
-         */
-        thread->vfpstate.hard.cpu = NR_CPUS;
-}
-#else
 void vfp_sync_hwstate(struct thread_info *thread)
 {
         unsigned int cpu = get_cpu();
@@ -490,9 +470,18 @@ void vfp_flush_hwstate(struct thread_info *thread)
                 last_VFP_context[cpu] = NULL;
         }
 
+#ifdef CONFIG_SMP
+        /*
+         * For SMP we still have to take care of the case where the thread
+         * migrates to another CPU and then back to the original CPU on which
+         * the last VFP user is still the same thread. Mark the thread VFP
+         * state as belonging to a non-existent CPU so that the saved one will
+         * be reloaded in the above case.
+         */
+        thread->vfpstate.hard.cpu = NR_CPUS;
+#endif
         put_cpu();
 }
-#endif
 
 #include <linux/smp.h>