arch/mips/mm/c-octeon.c - kernel/quantenna - Git at Google

 /*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * Copyright (C) 2005-2007 Cavium Networks
  */
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/smp.h>
 #include <linux/mm.h>
 #include <linux/bitops.h>
 #include <linux/cpu.h>
 #include <linux/io.h>

 #include <asm/bcache.h>
 #include <asm/bootinfo.h>
 #include <asm/cacheops.h>
 #include <asm/cpu-features.h>
 #include <asm/cpu-type.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/r4kcache.h>
 #include <asm/traps.h>
 #include <asm/mmu_context.h>
 #include <asm/war.h>

 #include <asm/octeon/octeon.h>

 unsigned long long cache_err_dcache[NR_CPUS];
 EXPORT_SYMBOL_GPL(cache_err_dcache);

 /**
  * Octeon automatically flushes the dcache on tlb changes, so
  * from Linux's viewpoint it acts much like a physically
  * tagged cache. No flushing is needed
  *
  */
 static void octeon_flush_data_cache_page(unsigned long addr)
 {
     /* Nothing to do */
 }

 static inline void octeon_local_flush_icache(void)
 {
 	asm volatile ("synci 0($0)");
 }

 /*
  * Flush local I-cache for the specified range.
  */
 static void local_octeon_flush_icache_range(unsigned long start,
 					    unsigned long end)
 {
 	octeon_local_flush_icache();
 }

 /**
  * Flush caches as necessary for all cores affected by a
  * vma. If no vma is supplied, all cores are flushed.
  *
  * @vma:    VMA to flush or NULL to flush all icaches.
  */
 static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
 {
 	extern void octeon_send_ipi_single(int cpu, unsigned int action);
 #ifdef CONFIG_SMP
 	int cpu;
 	cpumask_t mask;
 #endif

 	mb();
 	octeon_local_flush_icache();
 #ifdef CONFIG_SMP
 	preempt_disable();
 	cpu = smp_processor_id();

 	/*
 	 * If we have a vma structure, we only need to worry about
 	 * cores it has been used on
 	 */
 	if (vma)
 		mask = *mm_cpumask(vma->vm_mm);
 	else
 		mask = *cpu_online_mask;
 	cpumask_clear_cpu(cpu, &mask);
 	for_each_cpu(cpu, &mask)
 		octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);

 	preempt_enable();
 #endif
 }


 /**
  * Called to flush the icache on all cores
  */
 static void octeon_flush_icache_all(void)
 {
 	octeon_flush_icache_all_cores(NULL);
 }


 /**
  * Called to flush all memory associated with a memory
  * context.
  *
  * @mm:	    Memory context to flush
  */
 static void octeon_flush_cache_mm(struct mm_struct *mm)
 {
 	/*
 	 * According to the R4K version of this file, CPUs without
 	 * dcache aliases don't need to do anything here
 	 */
 }


 /**
  * Flush a range of kernel addresses out of the icache
  *
  */
 static void octeon_flush_icache_range(unsigned long start, unsigned long end)
 {
 	octeon_flush_icache_all_cores(NULL);
 }


 /**
  * Flush the icache for a trampoline. These are used for interrupt
  * and exception hooking.
  *
  * @addr:   Address to flush
  */
 static void octeon_flush_cache_sigtramp(unsigned long addr)
 {
 	struct vm_area_struct *vma;

 	down_read(&current->mm->mmap_sem);
 	vma = find_vma(current->mm, addr);
 	octeon_flush_icache_all_cores(vma);
 	up_read(&current->mm->mmap_sem);
 }


 /**
  * Flush a range out of a vma
  *
  * @vma:    VMA to flush
  * @start:
  * @end:
  */
 static void octeon_flush_cache_range(struct vm_area_struct *vma,
 				     unsigned long start, unsigned long end)
 {
 	if (vma->vm_flags & VM_EXEC)
 		octeon_flush_icache_all_cores(vma);
 }


 /**
  * Flush a specific page of a vma
  *
  * @vma:    VMA to flush page for
  * @page:   Page to flush
  * @pfn:
  */
 static void octeon_flush_cache_page(struct vm_area_struct *vma,
 				    unsigned long page, unsigned long pfn)
 {
 	if (vma->vm_flags & VM_EXEC)
 		octeon_flush_icache_all_cores(vma);
 }

 static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
 {
 	BUG();
 }

 /**
  * Probe Octeon's caches
  *
  */
 static void probe_octeon(void)
 {
 	unsigned long icache_size;
 	unsigned long dcache_size;
 	unsigned int config1;
 	struct cpuinfo_mips *c = &current_cpu_data;
 	int cputype = current_cpu_type();

 	config1 = read_c0_config1();
 	switch (cputype) {
 	case CPU_CAVIUM_OCTEON:
 	case CPU_CAVIUM_OCTEON_PLUS:
 		c->icache.linesz = 2 << ((config1 >> 19) & 7);
 		c->icache.sets = 64 << ((config1 >> 22) & 7);
 		c->icache.ways = 1 + ((config1 >> 16) & 7);
 		c->icache.flags |= MIPS_CACHE_VTAG;
 		icache_size =
 			c->icache.sets * c->icache.ways * c->icache.linesz;
 		c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
 		c->dcache.linesz = 128;
 		if (cputype == CPU_CAVIUM_OCTEON_PLUS)
 			c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
 		else
 			c->dcache.sets = 1; /* CN3XXX has one Dcache set */
 		c->dcache.ways = 64;
 		dcache_size =
 			c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 		c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
 		c->options |= MIPS_CPU_PREFETCH;
 		break;

 	case CPU_CAVIUM_OCTEON2:
 		c->icache.linesz = 2 << ((config1 >> 19) & 7);
 		c->icache.sets = 8;
 		c->icache.ways = 37;
 		c->icache.flags |= MIPS_CACHE_VTAG;
 		icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;

 		c->dcache.linesz = 128;
 		c->dcache.ways = 32;
 		c->dcache.sets = 8;
 		dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 		c->options |= MIPS_CPU_PREFETCH;
 		break;

 	case CPU_CAVIUM_OCTEON3:
 		c->icache.linesz = 128;
 		c->icache.sets = 16;
 		c->icache.ways = 39;
 		c->icache.flags |= MIPS_CACHE_VTAG;
 		icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;

 		c->dcache.linesz = 128;
 		c->dcache.ways = 32;
 		c->dcache.sets = 8;
 		dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 		c->options |= MIPS_CPU_PREFETCH;
 		break;

 	default:
 		panic("Unsupported Cavium Networks CPU type");
 		break;
 	}

 	/* compute a couple of other cache variables */
 	c->icache.waysize = icache_size / c->icache.ways;
 	c->dcache.waysize = dcache_size / c->dcache.ways;

 	c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
 	c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);

 	if (smp_processor_id() == 0) {
 		pr_notice("Primary instruction cache %ldkB, %s, %d way, "
 			  "%d sets, linesize %d bytes.\n",
 			  icache_size >> 10,
 			  cpu_has_vtag_icache ?
 				"virtually tagged" : "physically tagged",
 			  c->icache.ways, c->icache.sets, c->icache.linesz);

 		pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
 			  "linesize %d bytes.\n",
 			  dcache_size >> 10, c->dcache.ways,
 			  c->dcache.sets, c->dcache.linesz);
 	}
 }

 static void  octeon_cache_error_setup(void)
 {
 	extern char except_vec2_octeon;
 	set_handler(0x100, &except_vec2_octeon, 0x80);
 }

 /**
  * Setup the Octeon cache flush routines
  *
  */
 void octeon_cache_init(void)
 {
 	probe_octeon();

 	shm_align_mask = PAGE_SIZE - 1;

 	flush_cache_all			= octeon_flush_icache_all;
 	__flush_cache_all		= octeon_flush_icache_all;
 	flush_cache_mm			= octeon_flush_cache_mm;
 	flush_cache_page		= octeon_flush_cache_page;
 	flush_cache_range		= octeon_flush_cache_range;
 	flush_cache_sigtramp		= octeon_flush_cache_sigtramp;
 	flush_icache_all		= octeon_flush_icache_all;
 	flush_data_cache_page		= octeon_flush_data_cache_page;
 	flush_icache_range		= octeon_flush_icache_range;
 	local_flush_icache_range	= local_octeon_flush_icache_range;

 	__flush_kernel_vmap_range	= octeon_flush_kernel_vmap_range;

 	build_clear_page();
 	build_copy_page();

 	board_cache_error_setup = octeon_cache_error_setup;
 }

 /*
  * Handle a cache error exception
  */
 static RAW_NOTIFIER_HEAD(co_cache_error_chain);

 int register_co_cache_error_notifier(struct notifier_block *nb)
 {
 	return raw_notifier_chain_register(&co_cache_error_chain, nb);
 }
 EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);

 int unregister_co_cache_error_notifier(struct notifier_block *nb)
 {
 	return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
 }
 EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);

 static void co_cache_error_call_notifiers(unsigned long val)
 {
 	int rv = raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
 	if ((rv & ~NOTIFY_STOP_MASK) != NOTIFY_OK) {
 		u64 dcache_err;
 		unsigned long coreid = cvmx_get_core_num();
 		u64 icache_err = read_octeon_c0_icacheerr();

 		if (val) {
 			dcache_err = cache_err_dcache[coreid];
 			cache_err_dcache[coreid] = 0;
 		} else {
 			dcache_err = read_octeon_c0_dcacheerr();
 		}

 		pr_err("Core%lu: Cache error exception:\n", coreid);
 		pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
 		if (icache_err & 1) {
 			pr_err("CacheErr (Icache) == %llx\n",
 			       (unsigned long long)icache_err);
 			write_octeon_c0_icacheerr(0);
 		}
 		if (dcache_err & 1) {
 			pr_err("CacheErr (Dcache) == %llx\n",
 			       (unsigned long long)dcache_err);
 		}
 	}
 }

 /*
  * Called when the the exception is recoverable
  */

 asmlinkage void cache_parity_error_octeon_recoverable(void)
 {
 	co_cache_error_call_notifiers(0);
 }

 /**
  * Called when the the exception is not recoverable
  */

 asmlinkage void cache_parity_error_octeon_non_recoverable(void)
 {
 	co_cache_error_call_notifiers(1);
 	panic("Can't handle cache error: nested exception");
 }
	/*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* Copyright (C) 2005-2007 Cavium Networks
	*/
	#include <linux/export.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/smp.h>
	#include <linux/mm.h>
	#include <linux/bitops.h>
	#include <linux/cpu.h>
	#include <linux/io.h>

	#include <asm/bcache.h>
	#include <asm/bootinfo.h>
	#include <asm/cacheops.h>
	#include <asm/cpu-features.h>
	#include <asm/cpu-type.h>
	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/r4kcache.h>
	#include <asm/traps.h>
	#include <asm/mmu_context.h>
	#include <asm/war.h>

	#include <asm/octeon/octeon.h>

	unsigned long long cache_err_dcache[NR_CPUS];
	EXPORT_SYMBOL_GPL(cache_err_dcache);

	/**
	* Octeon automatically flushes the dcache on tlb changes, so
	* from Linux's viewpoint it acts much like a physically
	* tagged cache. No flushing is needed
	*
	*/
	static void octeon_flush_data_cache_page(unsigned long addr)
	{
	/* Nothing to do */
	}

	static inline void octeon_local_flush_icache(void)
	{
	asm volatile ("synci 0($0)");
	}

	/*
	* Flush local I-cache for the specified range.
	*/
	static void local_octeon_flush_icache_range(unsigned long start,
	unsigned long end)
	{
	octeon_local_flush_icache();
	}

	/**
	* Flush caches as necessary for all cores affected by a
	* vma. If no vma is supplied, all cores are flushed.
	*
	* @vma: VMA to flush or NULL to flush all icaches.
	*/
	static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
	{
	extern void octeon_send_ipi_single(int cpu, unsigned int action);
	#ifdef CONFIG_SMP
	int cpu;
	cpumask_t mask;
	#endif

	mb();
	octeon_local_flush_icache();
	#ifdef CONFIG_SMP
	preempt_disable();
	cpu = smp_processor_id();

	/*
	* If we have a vma structure, we only need to worry about
	* cores it has been used on
	*/
	if (vma)
	mask = *mm_cpumask(vma->vm_mm);
	else
	mask = *cpu_online_mask;
	cpumask_clear_cpu(cpu, &mask);
	for_each_cpu(cpu, &mask)
	octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);

	preempt_enable();
	#endif
	}


	/**
	* Called to flush the icache on all cores
	*/
	static void octeon_flush_icache_all(void)
	{
	octeon_flush_icache_all_cores(NULL);
	}


	/**
	* Called to flush all memory associated with a memory
	* context.
	*
	* @mm: Memory context to flush
	*/
	static void octeon_flush_cache_mm(struct mm_struct *mm)
	{
	/*
	* According to the R4K version of this file, CPUs without
	* dcache aliases don't need to do anything here
	*/
	}


	/**
	* Flush a range of kernel addresses out of the icache
	*
	*/
	static void octeon_flush_icache_range(unsigned long start, unsigned long end)
	{
	octeon_flush_icache_all_cores(NULL);
	}


	/**
	* Flush the icache for a trampoline. These are used for interrupt
	* and exception hooking.
	*
	* @addr: Address to flush
	*/
	static void octeon_flush_cache_sigtramp(unsigned long addr)
	{
	struct vm_area_struct *vma;

	down_read(&current->mm->mmap_sem);
	vma = find_vma(current->mm, addr);
	octeon_flush_icache_all_cores(vma);
	up_read(&current->mm->mmap_sem);
	}


	/**
	* Flush a range out of a vma
	*
	* @vma: VMA to flush
	* @start:
	* @end:
	*/
	static void octeon_flush_cache_range(struct vm_area_struct *vma,
	unsigned long start, unsigned long end)
	{
	if (vma->vm_flags & VM_EXEC)
	octeon_flush_icache_all_cores(vma);
	}


	/**
	* Flush a specific page of a vma
	*
	* @vma: VMA to flush page for
	* @page: Page to flush
	* @pfn:
	*/
	static void octeon_flush_cache_page(struct vm_area_struct *vma,
	unsigned long page, unsigned long pfn)
	{
	if (vma->vm_flags & VM_EXEC)
	octeon_flush_icache_all_cores(vma);
	}

	static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
	{
	BUG();
	}

	/**
	* Probe Octeon's caches
	*
	*/
	static void probe_octeon(void)
	{
	unsigned long icache_size;
	unsigned long dcache_size;
	unsigned int config1;
	struct cpuinfo_mips *c = &current_cpu_data;
	int cputype = current_cpu_type();

	config1 = read_c0_config1();
	switch (cputype) {
	case CPU_CAVIUM_OCTEON:
	case CPU_CAVIUM_OCTEON_PLUS:
	c->icache.linesz = 2 << ((config1 >> 19) & 7);
	c->icache.sets = 64 << ((config1 >> 22) & 7);
	c->icache.ways = 1 + ((config1 >> 16) & 7);
	c->icache.flags \|= MIPS_CACHE_VTAG;
	icache_size =
	c->icache.sets * c->icache.ways * c->icache.linesz;
	c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
	c->dcache.linesz = 128;
	if (cputype == CPU_CAVIUM_OCTEON_PLUS)
	c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
	else
	c->dcache.sets = 1; /* CN3XXX has one Dcache set */
	c->dcache.ways = 64;
	dcache_size =
	c->dcache.sets * c->dcache.ways * c->dcache.linesz;
	c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
	c->options \|= MIPS_CPU_PREFETCH;
	break;

	case CPU_CAVIUM_OCTEON2:
	c->icache.linesz = 2 << ((config1 >> 19) & 7);
	c->icache.sets = 8;
	c->icache.ways = 37;
	c->icache.flags \|= MIPS_CACHE_VTAG;
	icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;

	c->dcache.linesz = 128;
	c->dcache.ways = 32;
	c->dcache.sets = 8;
	dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
	c->options \|= MIPS_CPU_PREFETCH;
	break;

	case CPU_CAVIUM_OCTEON3:
	c->icache.linesz = 128;
	c->icache.sets = 16;
	c->icache.ways = 39;
	c->icache.flags \|= MIPS_CACHE_VTAG;
	icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;

	c->dcache.linesz = 128;
	c->dcache.ways = 32;
	c->dcache.sets = 8;
	dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
	c->options \|= MIPS_CPU_PREFETCH;
	break;

	default:
	panic("Unsupported Cavium Networks CPU type");
	break;
	}

	/* compute a couple of other cache variables */
	c->icache.waysize = icache_size / c->icache.ways;
	c->dcache.waysize = dcache_size / c->dcache.ways;

	c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
	c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);

	if (smp_processor_id() == 0) {
	pr_notice("Primary instruction cache %ldkB, %s, %d way, "
	"%d sets, linesize %d bytes.\n",
	icache_size >> 10,
	cpu_has_vtag_icache ?
	"virtually tagged" : "physically tagged",
	c->icache.ways, c->icache.sets, c->icache.linesz);

	pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
	"linesize %d bytes.\n",
	dcache_size >> 10, c->dcache.ways,
	c->dcache.sets, c->dcache.linesz);
	}
	}

	static void octeon_cache_error_setup(void)
	{
	extern char except_vec2_octeon;
	set_handler(0x100, &except_vec2_octeon, 0x80);
	}

	/**
	* Setup the Octeon cache flush routines
	*
	*/
	void octeon_cache_init(void)
	{
	probe_octeon();

	shm_align_mask = PAGE_SIZE - 1;

	flush_cache_all = octeon_flush_icache_all;
	__flush_cache_all = octeon_flush_icache_all;
	flush_cache_mm = octeon_flush_cache_mm;
	flush_cache_page = octeon_flush_cache_page;
	flush_cache_range = octeon_flush_cache_range;
	flush_cache_sigtramp = octeon_flush_cache_sigtramp;
	flush_icache_all = octeon_flush_icache_all;
	flush_data_cache_page = octeon_flush_data_cache_page;
	flush_icache_range = octeon_flush_icache_range;
	local_flush_icache_range = local_octeon_flush_icache_range;

	__flush_kernel_vmap_range = octeon_flush_kernel_vmap_range;

	build_clear_page();
	build_copy_page();

	board_cache_error_setup = octeon_cache_error_setup;
	}

	/*
	* Handle a cache error exception
	*/
	static RAW_NOTIFIER_HEAD(co_cache_error_chain);

	int register_co_cache_error_notifier(struct notifier_block *nb)
	{
	return raw_notifier_chain_register(&co_cache_error_chain, nb);
	}
	EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);

	int unregister_co_cache_error_notifier(struct notifier_block *nb)
	{
	return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
	}
	EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);

	static void co_cache_error_call_notifiers(unsigned long val)
	{
	int rv = raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
	if ((rv & ~NOTIFY_STOP_MASK) != NOTIFY_OK) {
	u64 dcache_err;
	unsigned long coreid = cvmx_get_core_num();
	u64 icache_err = read_octeon_c0_icacheerr();

	if (val) {
	dcache_err = cache_err_dcache[coreid];
	cache_err_dcache[coreid] = 0;
	} else {
	dcache_err = read_octeon_c0_dcacheerr();
	}

	pr_err("Core%lu: Cache error exception:\n", coreid);
	pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
	if (icache_err & 1) {
	pr_err("CacheErr (Icache) == %llx\n",
	(unsigned long long)icache_err);
	write_octeon_c0_icacheerr(0);
	}
	if (dcache_err & 1) {
	pr_err("CacheErr (Dcache) == %llx\n",
	(unsigned long long)dcache_err);
	}
	}
	}

	/*
	* Called when the the exception is recoverable
	*/

	asmlinkage void cache_parity_error_octeon_recoverable(void)
	{
	co_cache_error_call_notifiers(0);
	}

	/**
	* Called when the the exception is not recoverable
	*/

	asmlinkage void cache_parity_error_octeon_non_recoverable(void)
	{
	co_cache_error_call_notifiers(1);
	panic("Can't handle cache error: nested exception");
	}