X86 late bug fixes for 2.6.22

Index: linux/arch/i386/kernel/cpu/mtrr/generic.c
===================================================================
@@ -84,6 +84,9 @@ void get_mtrr_state(void)
 	struct mtrr_var_range *vrs;
 	unsigned lo, dummy;
 
+	if (!num_var_ranges)
+		return;
+
 	if (!mtrr_state.var_ranges) {
 		mtrr_state.var_ranges = kmalloc(num_var_ranges * sizeof (struct mtrr_var_range), 
 						GFP_KERNEL);

Index: linux/arch/i386/kernel/cpu/mtrr/main.c
===================================================================
@@ -120,6 +120,11 @@ static void __init init_table(void)
 {
 	int i, max;
 
+	if (!num_var_ranges) {
+		printk(KERN_ERR "mtrr: no MTRR range found.\n");
+		return;
+	}
+
 	max = num_var_ranges;
 	if ((usage_table = kmalloc(max * sizeof *usage_table, GFP_KERNEL))
 	    == NULL) {

Index: linux/arch/x86_64/ia32/sys_ia32.c
===================================================================
@@ -860,3 +860,22 @@ long sys32_lookup_dcookie(u32 addr_low, 
 	return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
 }
 
+asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, size_t count)
+{
+	return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
+}
+
+asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
+			   unsigned n_low, unsigned n_hi,  int flags)
+{
+	return sys_sync_file_range(fd,
+				   ((u64)off_hi << 32) | off_low,
+				   ((u64)n_hi << 32) | n_low, flags);
+}
+
+asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, size_t len,
+		     int advice)
+{
+	return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
+				len, advice);
+}

Index: linux/include/asm-x86_64/unistd.h
===================================================================
@@ -626,9 +626,9 @@ __SYSCALL(__NR_utimensat, sys_utimensat)
 __SYSCALL(__NR_epoll_pwait, sys_epoll_pwait)
 #define __NR_signalfd		282
 __SYSCALL(__NR_signalfd, sys_signalfd)
-#define __NR_timerfd		282
+#define __NR_timerfd		283
 __SYSCALL(__NR_timerfd, sys_timerfd)
-#define __NR_eventfd		283
+#define __NR_eventfd		284
 __SYSCALL(__NR_eventfd, sys_eventfd)
 
 #ifndef __NO_STUBS

Index: linux/arch/x86_64/kernel/pci-dma.c
===================================================================
@@ -322,5 +322,17 @@ static int __init pci_iommu_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_PCI
+/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
+
+static __devinit void via_no_dac(struct pci_dev *dev)
+{
+	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
+		printk(KERN_INFO "PCI: VIA PCI bridge detected. Disabling DAC.\n");
+		forbid_dac = 1;
+	}
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
+#endif
 /* Must execute after PCI subsystem */
 fs_initcall(pci_iommu_init);

Index: linux/arch/i386/kernel/pci-dma.c
===================================================================
@@ -12,6 +12,7 @@
 #include <linux/string.h>
 #include <linux/pci.h>
 #include <linux/module.h>
+#include <linux/pci.h>
 #include <asm/io.h>
 
 struct dma_coherent_mem {

@@ -148,3 +149,29 @@ void *dma_mark_declared_memory_occupied(
 	return mem->virt_base + (pos << PAGE_SHIFT);
 }
 EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
+
+#ifdef CONFIG_PCI
+/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
+
+int forbid_dac;
+EXPORT_SYMBOL(forbid_dac);
+
+static __devinit void via_no_dac(struct pci_dev *dev)
+{
+	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
+		printk(KERN_INFO "PCI: VIA PCI bridge detected. Disabling DAC.\n");
+		forbid_dac = 1;
+	}
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
+
+static int check_iommu(char *s)
+{
+	if (!strcmp(s, "usedac")) {
+		forbid_dac = -1;
+		return 1;
+	}
+	return 0;
+}
+__setup("iommu=", check_iommu);
+#endif

Index: linux/include/asm-i386/dma-mapping.h
===================================================================
@@ -123,6 +123,8 @@ dma_mapping_error(dma_addr_t dma_addr)
 	return 0;
 }
 
+extern int forbid_dac;
+
 static inline int
 dma_supported(struct device *dev, u64 mask)
 {

@@ -134,6 +136,10 @@ dma_supported(struct device *dev, u64 ma
         if(mask < 0x00ffffff)
                 return 0;
 
+	/* Work around chipset bugs */
+	if (forbid_dac > 0 && mask > 0xffffffffULL)
+		return 0;
+
 	return 1;
 }
 

Index: linux/arch/i386/mm/pageattr.c
===================================================================
@@ -68,14 +68,23 @@ static struct page *split_large_page(uns
 	return base;
 } 
 
-static void flush_kernel_map(void *arg)
+static void cache_flush_page(struct page *p)
 { 
-	unsigned long adr = (unsigned long)arg;
+	unsigned long adr = (unsigned long)page_address(p);
+	int i;
+	for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
+		asm volatile("clflush (%0)" :: "r" (adr + i));
+}
+
+static void flush_kernel_map(void *arg)
+{
+	struct list_head *lh = (struct list_head *)arg;
+	struct page *p;
 
-	if (adr && cpu_has_clflush) {
-		int i;
-		for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
-			asm volatile("clflush (%0)" :: "r" (adr + i));
+	/* High level code is not ready for clflush yet */
+	if (0 && cpu_has_clflush) {
+		list_for_each_entry (p, lh, lru)
+			cache_flush_page(p);
 	} else if (boot_cpu_data.x86_model >= 4)
 		wbinvd();
 

@@ -181,9 +190,9 @@ __change_page_attr(struct page *page, pg
 	return 0;
 } 
 
-static inline void flush_map(void *adr)
+static inline void flush_map(struct list_head *l)
 {
-	on_each_cpu(flush_kernel_map, adr, 1, 1);
+	on_each_cpu(flush_kernel_map, l, 1, 1);
 }
 
 /*

@@ -225,11 +234,8 @@ void global_flush_tlb(void)
 	spin_lock_irq(&cpa_lock);
 	list_replace_init(&df_list, &l);
 	spin_unlock_irq(&cpa_lock);
-	if (!cpu_has_clflush)
-		flush_map(NULL);
+	flush_map(&l);
 	list_for_each_entry_safe(pg, next, &l, lru) {
-		if (cpu_has_clflush)
-			flush_map(page_address(pg));
 		__free_page(pg);
 	}
 }

Index: linux/arch/x86_64/mm/pageattr.c
===================================================================
@@ -74,10 +74,11 @@ static void flush_kernel_map(void *arg)
 	struct page *pg;
 
 	/* When clflush is available always use it because it is
-	   much cheaper than WBINVD */
-	if (!cpu_has_clflush)
+	   much cheaper than WBINVD. Disable clflush for now because
+	   the high level code is not ready yet */
+	if (1 || !cpu_has_clflush)
 		asm volatile("wbinvd" ::: "memory");
-	list_for_each_entry(pg, l, lru) {
+	else list_for_each_entry(pg, l, lru) {
 		void *adr = page_address(pg);
 		if (cpu_has_clflush)
 			cache_flush_page(adr);

Index: linux/arch/i386/kernel/alternative.c
===================================================================
@@ -308,6 +308,11 @@ void alternatives_smp_switch(int smp)
 	printk("lockdep: not fixing up alternatives.\n");
 	return;
 #endif
+#ifdef CONFIG_DEBUG_RODATA
+	/* To be fixed properly post 2.6.22 -- need to get writable
+ 	   mappings of the kernel text */
+	return;
+#endif
 
 	if (noreplace_smp || smp_alt_once)
 		return;

Index: linux/arch/i386/kernel/cpu/mtrr/generic.c
===================================================================
@@ -42,7 +42,7 @@ static int mtrr_show;
 module_param_named(show, mtrr_show, bool, 0);
 
 /*  Get the MSR pair relating to a var range  */
-static void __init
+static void
 get_mtrr_var_range(unsigned int index, struct mtrr_var_range *vr)
 {
 	rdmsr(MTRRphysBase_MSR(index), vr->base_lo, vr->base_hi);

@@ -68,7 +68,7 @@ void mtrr_save_fixed_ranges(void *info)
 	get_fixed_ranges(mtrr_state.fixed_ranges);
 }
 
-static void __cpuinit print_fixed(unsigned base, unsigned step, const mtrr_type*types)
+static void print_fixed(unsigned base, unsigned step, const mtrr_type*types)
 {
 	unsigned i;
 

Index: linux/arch/i386/kernel/cpu/mtrr/main.c
===================================================================
@@ -644,7 +644,7 @@ static struct sysdev_driver mtrr_sysdev_
  * initialized (i.e. before smp_init()).
  * 
  */
-void mtrr_bp_init(void)
+__init void mtrr_bp_init(void)
 {
 	init_ifs();
 

Index: linux/arch/i386/kernel/cpu/mtrr/generic.c
===================================================================
@@ -42,7 +42,7 @@ static int mtrr_show;
 module_param_named(show, mtrr_show, bool, 0);
 
 /*  Get the MSR pair relating to a var range  */
-static void __init
+static void
 get_mtrr_var_range(unsigned int index, struct mtrr_var_range *vr)
 {
 	rdmsr(MTRRphysBase_MSR(index), vr->base_lo, vr->base_hi);

@@ -68,7 +68,7 @@ void mtrr_save_fixed_ranges(void *info)
 	get_fixed_ranges(mtrr_state.fixed_ranges);
 }
 
-static void __cpuinit print_fixed(unsigned base, unsigned step, const mtrr_type*types)
+static void print_fixed(unsigned base, unsigned step, const mtrr_type*types)
 {
 	unsigned i;
 

Index: linux/arch/i386/kernel/cpu/mtrr/main.c
===================================================================
@@ -644,7 +644,7 @@ static struct sysdev_driver mtrr_sysdev_
  * initialized (i.e. before smp_init()).
  * 
  */
-void mtrr_bp_init(void)
+__init void mtrr_bp_init(void)
 {
 	init_ifs();