#include <asm/msr.h>
#include <asm/tlbflush.h>
#include <asm/processor.h>
+#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pat.h>
#include <asm/e820.h>
#include <asm/mtrr.h>
#include <asm/io.h>
-int pat_wc_enabled = 1;
+#ifdef CONFIG_X86_PAT
+int __read_mostly pat_wc_enabled = 1;
-static u64 __read_mostly boot_pat_state;
-
-static int nopat(char *str)
+void __cpuinit pat_disable(char *reason)
{
pat_wc_enabled = 0;
- printk(KERN_INFO "x86: PAT support disabled.\n");
+ printk(KERN_INFO "%s\n", reason);
+}
+static int nopat(char *str)
+{
+ pat_disable("PAT support disabled.");
return 0;
}
early_param("nopat", nopat);
+#endif
-static int pat_known_cpu(void)
-{
- if (!pat_wc_enabled)
- return 0;
-
- if (cpu_has_pat)
- return 1;
- pat_wc_enabled = 0;
- printk(KERN_INFO "CPU and/or kernel does not support PAT.\n");
+static int debug_enable;
+static int __init pat_debug_setup(char *str)
+{
+ debug_enable = 1;
return 0;
}
+__setup("debugpat", pat_debug_setup);
+
+#define dprintk(fmt, arg...) \
+ do { if (debug_enable) printk(KERN_INFO fmt, ##arg); } while (0)
+
+
+static u64 __read_mostly boot_pat_state;
enum {
PAT_UC = 0, /* uncached */
{
u64 pat;
-#ifndef CONFIG_X86_PAT
- nopat(NULL);
-#endif
-
- /* Boot CPU enables PAT based on CPU feature */
- if (!smp_processor_id() && !pat_known_cpu())
+ if (!pat_wc_enabled)
return;
- /* APs enable PAT iff boot CPU has enabled it before */
- if (smp_processor_id() && !pat_wc_enabled)
- return;
+ /* Paranoia check. */
+ if (!cpu_has_pat) {
+ printk(KERN_ERR "PAT enabled, but CPU feature cleared\n");
+ /*
+ * Panic if this happens on the secondary CPU, and we
+ * switched to PAT on the boot CPU. We have no way to
+ * undo PAT.
+ */
+ BUG_ON(boot_pat_state);
+ }
/* Set PWT to Write-Combining. All other bits stay the same */
/*
PAT(4,WB) | PAT(5,WC) | PAT(6,UC_MINUS) | PAT(7,UC);
/* Boot CPU check */
- if (!smp_processor_id()) {
+ if (!boot_pat_state)
rdmsrl(MSR_IA32_CR_PAT, boot_pat_state);
- }
wrmsrl(MSR_IA32_CR_PAT, pat);
printk(KERN_INFO "x86 PAT enabled: cpu %d, old 0x%Lx, new 0x%Lx\n",
struct memtype *saved_ptr;
if (parse->start >= end) {
- pr_debug("New Entry\n");
+ dprintk("New Entry\n");
list_add(&new_entry->nd, parse->nd.prev);
new_entry = NULL;
break;
break;
}
- printk("Overlap at 0x%Lx-0x%Lx\n",
+ dprintk("Overlap at 0x%Lx-0x%Lx\n",
saved_ptr->start, saved_ptr->end);
/* No conflict. Go ahead and add this new entry */
list_add(&new_entry->nd, saved_ptr->nd.prev);
break;
}
- printk(KERN_INFO "Overlap at 0x%Lx-0x%Lx\n",
- saved_ptr->start, saved_ptr->end);
+ dprintk("Overlap at 0x%Lx-0x%Lx\n",
+ saved_ptr->start, saved_ptr->end);
/* No conflict. Go ahead and add this new entry */
list_add(&new_entry->nd, &saved_ptr->nd);
new_entry = NULL;
if (new_entry) {
/* No conflict. Not yet added to the list. Add to the tail */
list_add_tail(&new_entry->nd, &memtype_list);
- pr_debug("New Entry\n");
+ dprintk("New Entry\n");
}
if (ret_type) {
- pr_debug(
+ dprintk(
"reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s, ret %s\n",
start, end, cattr_name(actual_type),
cattr_name(req_type), cattr_name(*ret_type));
} else {
- pr_debug(
+ dprintk(
"reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s\n",
start, end, cattr_name(actual_type),
cattr_name(req_type));
current->comm, current->pid, start, end);
}
- pr_debug("free_memtype request 0x%Lx-0x%Lx\n", start, end);
+ dprintk("free_memtype request 0x%Lx-0x%Lx\n", start, end);
return err;
}
return vma_prot;
}
+#ifdef CONFIG_NONPROMISC_DEVMEM
+/* This check is done in drivers/char/mem.c in case of NONPROMISC_DEVMEM*/
+static inline int range_is_allowed(unsigned long pfn, unsigned long size)
+{
+ return 1;
+}
+#else
+static inline int range_is_allowed(unsigned long pfn, unsigned long size)
+{
+ u64 from = ((u64)pfn) << PAGE_SHIFT;
+ u64 to = from + size;
+ u64 cursor = from;
+
+ while (cursor < to) {
+ if (!devmem_is_allowed(pfn)) {
+ printk(KERN_INFO
+ "Program %s tried to access /dev/mem between %Lx->%Lx.\n",
+ current->comm, from, to);
+ return 0;
+ }
+ cursor += PAGE_SIZE;
+ pfn++;
+ }
+ return 1;
+}
+#endif /* CONFIG_NONPROMISC_DEVMEM */
+
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t *vma_prot)
{
u64 offset = ((u64) pfn) << PAGE_SHIFT;
unsigned long flags = _PAGE_CACHE_UC_MINUS;
- unsigned long ret_flags;
int retval;
+ if (!range_is_allowed(pfn, size))
+ return 0;
+
if (file->f_flags & O_SYNC) {
flags = _PAGE_CACHE_UC;
}
* we maintain the tradition of paranoia in this code.
*/
if (!pat_wc_enabled &&
- ! ( test_bit(X86_FEATURE_MTRR, boot_cpu_data.x86_capability) ||
- test_bit(X86_FEATURE_K6_MTRR, boot_cpu_data.x86_capability) ||
- test_bit(X86_FEATURE_CYRIX_ARR, boot_cpu_data.x86_capability) ||
- test_bit(X86_FEATURE_CENTAUR_MCR, boot_cpu_data.x86_capability)) &&
+ ! ( boot_cpu_has(X86_FEATURE_MTRR) ||
+ boot_cpu_has(X86_FEATURE_K6_MTRR) ||
+ boot_cpu_has(X86_FEATURE_CYRIX_ARR) ||
+ boot_cpu_has(X86_FEATURE_CENTAUR_MCR)) &&
(pfn << PAGE_SHIFT) >= __pa(high_memory)) {
flags = _PAGE_CACHE_UC;
}
if (flags != _PAGE_CACHE_UC_MINUS) {
retval = reserve_memtype(offset, offset + size, flags, NULL);
} else {
- retval = reserve_memtype(offset, offset + size, -1, &ret_flags);
+ retval = reserve_memtype(offset, offset + size, -1, &flags);
}
if (retval < 0)
return 0;
- flags = ret_flags;
-
if (pfn <= max_pfn_mapped &&
ioremap_change_attr((unsigned long)__va(offset), size, flags) < 0) {
free_memtype(offset, offset + size);
"%s:%d /dev/mem ioremap_change_attr failed %s for %Lx-%Lx\n",
current->comm, current->pid,
cattr_name(flags),
- offset, offset + size);
+ offset, (unsigned long long)(offset + size));
return 0;
}
"%s:%d /dev/mem expected mapping type %s for %Lx-%Lx, got %s\n",
current->comm, current->pid,
cattr_name(want_flags),
- addr, addr + size,
+ addr, (unsigned long long)(addr + size),
cattr_name(flags));
}
}