#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/fs.h>
+#include <linux/rbtree.h>
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/tlbflush.h>
+#include <asm/x86_init.h>
#include <asm/pgtable.h>
#include <asm/fcntl.h>
#include <asm/e820.h>
#ifdef CONFIG_X86_PAT
int __read_mostly pat_enabled = 1;
-void __cpuinit pat_disable(const char *reason)
+static inline void pat_disable(const char *reason)
{
pat_enabled = 0;
printk(KERN_INFO "%s\n", reason);
void pat_init(void)
{
u64 pat;
+ bool boot_cpu = !boot_pat_state;
if (!pat_enabled)
return;
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",
- smp_processor_id(), boot_pat_state, pat);
+
+ if (boot_cpu)
+ printk(KERN_INFO "x86 PAT enabled: cpu %d, old 0x%Lx, new 0x%Lx\n",
+ smp_processor_id(), boot_pat_state, pat);
}
#undef PAT
* areas). All the aliases have the same cache attributes of course.
* Zero attributes are represented as holes.
*
- * Currently the data structure is a list because the number of mappings
- * are expected to be relatively small. If this should be a problem
- * it could be changed to a rbtree or similar.
+ * The data structure is a list that is also organized as an rbtree
+ * sorted on the start address of memtype range.
*
- * memtype_lock protects the whole list.
+ * memtype_lock protects both the linear list and rbtree.
*/
struct memtype {
u64 end;
unsigned long type;
struct list_head nd;
+ struct rb_node rb;
};
+static struct rb_root memtype_rbroot = RB_ROOT;
static LIST_HEAD(memtype_list);
static DEFINE_SPINLOCK(memtype_lock); /* protects memtype list */
+static struct memtype *memtype_rb_search(struct rb_root *root, u64 start)
+{
+ struct rb_node *node = root->rb_node;
+ struct memtype *last_lower = NULL;
+
+ while (node) {
+ struct memtype *data = container_of(node, struct memtype, rb);
+
+ if (data->start < start) {
+ last_lower = data;
+ node = node->rb_right;
+ } else if (data->start > start) {
+ node = node->rb_left;
+ } else
+ return data;
+ }
+
+ /* Will return NULL if there is no entry with its start <= start */
+ return last_lower;
+}
+
+static void memtype_rb_insert(struct rb_root *root, struct memtype *data)
+{
+ struct rb_node **new = &(root->rb_node);
+ struct rb_node *parent = NULL;
+
+ while (*new) {
+ struct memtype *this = container_of(*new, struct memtype, rb);
+
+ parent = *new;
+ if (data->start <= this->start)
+ new = &((*new)->rb_left);
+ else if (data->start > this->start)
+ new = &((*new)->rb_right);
+ }
+
+ rb_link_node(&data->rb, parent, new);
+ rb_insert_color(&data->rb, root);
+}
+
/*
* Does intersection of PAT memory type and MTRR memory type and returns
* the resulting memory type as PAT understands it.
u8 mtrr_type;
mtrr_type = mtrr_type_lookup(start, end);
- if (mtrr_type == MTRR_TYPE_UNCACHABLE)
- return _PAGE_CACHE_UC;
- if (mtrr_type == MTRR_TYPE_WRCOMB)
- return _PAGE_CACHE_WC;
+ if (mtrr_type != MTRR_TYPE_WRBACK)
+ return _PAGE_CACHE_UC_MINUS;
+
+ return _PAGE_CACHE_WB;
}
return req_type;
return -EBUSY;
}
-static struct memtype *cached_entry;
-static u64 cached_start;
-
static int pat_pagerange_is_ram(unsigned long start, unsigned long end)
{
int ram_page = 0, not_rampage = 0;
}
/*
- * For RAM pages, mark the pages as non WB memory type using
- * PageNonWB (PG_arch_1). We allow only one set_memory_uc() or
- * set_memory_wc() on a RAM page at a time before marking it as WB again.
- * This is ok, because only one driver will be owning the page and
- * doing set_memory_*() calls.
+ * For RAM pages, we use page flags to mark the pages with appropriate type.
+ * Here we do two pass:
+ * - Find the memtype of all the pages in the range, look for any conflicts
+ * - In case of no conflicts, set the new memtype for pages in the range
*
- * For now, we use PageNonWB to track that the RAM page is being mapped
- * as non WB. In future, we will have to use one more flag
- * (or some other mechanism in page_struct) to distinguish between
- * UC and WC mapping.
+ * Caller must hold memtype_lock for atomicity.
*/
static int reserve_ram_pages_type(u64 start, u64 end, unsigned long req_type,
unsigned long *new_type)
{
struct page *page;
- u64 pfn, end_pfn;
+ u64 pfn;
+
+ if (req_type == _PAGE_CACHE_UC) {
+ /* We do not support strong UC */
+ WARN_ON_ONCE(1);
+ req_type = _PAGE_CACHE_UC_MINUS;
+ }
for (pfn = (start >> PAGE_SHIFT); pfn < (end >> PAGE_SHIFT); ++pfn) {
- page = pfn_to_page(pfn);
- if (page_mapped(page) || PageNonWB(page))
- goto out;
+ unsigned long type;
- SetPageNonWB(page);
+ page = pfn_to_page(pfn);
+ type = get_page_memtype(page);
+ if (type != -1) {
+ printk(KERN_INFO "reserve_ram_pages_type failed "
+ "0x%Lx-0x%Lx, track 0x%lx, req 0x%lx\n",
+ start, end, type, req_type);
+ if (new_type)
+ *new_type = type;
+
+ return -EBUSY;
+ }
}
- return 0;
-out:
- end_pfn = pfn;
- for (pfn = (start >> PAGE_SHIFT); pfn < end_pfn; ++pfn) {
+ if (new_type)
+ *new_type = req_type;
+
+ for (pfn = (start >> PAGE_SHIFT); pfn < (end >> PAGE_SHIFT); ++pfn) {
page = pfn_to_page(pfn);
- ClearPageNonWB(page);
+ set_page_memtype(page, req_type);
}
-
- return -EINVAL;
+ return 0;
}
static int free_ram_pages_type(u64 start, u64 end)
{
struct page *page;
- u64 pfn, end_pfn;
+ u64 pfn;
for (pfn = (start >> PAGE_SHIFT); pfn < (end >> PAGE_SHIFT); ++pfn) {
page = pfn_to_page(pfn);
- if (page_mapped(page) || !PageNonWB(page))
- goto out;
-
- ClearPageNonWB(page);
+ set_page_memtype(page, -1);
}
return 0;
-
-out:
- end_pfn = pfn;
- for (pfn = (start >> PAGE_SHIFT); pfn < end_pfn; ++pfn) {
- page = pfn_to_page(pfn);
- SetPageNonWB(page);
- }
- return -EINVAL;
}
/*
* - _PAGE_CACHE_UC_MINUS
* - _PAGE_CACHE_UC
*
- * req_type will have a special case value '-1', when requester want to inherit
- * the memory type from mtrr (if WB), existing PAT, defaulting to UC_MINUS.
- *
* If new_type is NULL, function will return an error if it cannot reserve the
* region with req_type. If new_type is non-NULL, function will return
* available type in new_type in case of no error. In case of any error
if (!pat_enabled) {
/* This is identical to page table setting without PAT */
if (new_type) {
- if (req_type == -1)
- *new_type = _PAGE_CACHE_WB;
+ if (req_type == _PAGE_CACHE_WC)
+ *new_type = _PAGE_CACHE_UC_MINUS;
else
*new_type = req_type & _PAGE_CACHE_MASK;
}
}
/* Low ISA region is always mapped WB in page table. No need to track */
- if (is_ISA_range(start, end - 1)) {
+ if (x86_platform.is_untracked_pat_range(start, end)) {
if (new_type)
*new_type = _PAGE_CACHE_WB;
return 0;
}
- if (req_type == -1) {
- /*
- * Call mtrr_lookup to get the type hint. This is an
- * optimization for /dev/mem mmap'ers into WB memory (BIOS
- * tools and ACPI tools). Use WB request for WB memory and use
- * UC_MINUS otherwise.
- */
- u8 mtrr_type = mtrr_type_lookup(start, end);
-
- if (mtrr_type == MTRR_TYPE_WRBACK)
- actual_type = _PAGE_CACHE_WB;
- else
- actual_type = _PAGE_CACHE_UC_MINUS;
- } else {
- actual_type = pat_x_mtrr_type(start, end,
- req_type & _PAGE_CACHE_MASK);
- }
+ /*
+ * Call mtrr_lookup to get the type hint. This is an
+ * optimization for /dev/mem mmap'ers into WB memory (BIOS
+ * tools and ACPI tools). Use WB request for WB memory and use
+ * UC_MINUS otherwise.
+ */
+ actual_type = pat_x_mtrr_type(start, end, req_type & _PAGE_CACHE_MASK);
if (new_type)
*new_type = actual_type;
is_range_ram = pat_pagerange_is_ram(start, end);
- if (is_range_ram == 1)
- return reserve_ram_pages_type(start, end, req_type,
- new_type);
- else if (is_range_ram < 0)
+ if (is_range_ram == 1) {
+
+ spin_lock(&memtype_lock);
+ err = reserve_ram_pages_type(start, end, req_type, new_type);
+ spin_unlock(&memtype_lock);
+
+ return err;
+ } else if (is_range_ram < 0) {
return -EINVAL;
+ }
new = kmalloc(sizeof(struct memtype), GFP_KERNEL);
if (!new)
spin_lock(&memtype_lock);
- if (cached_entry && start >= cached_start)
- entry = cached_entry;
- else
- entry = list_entry(&memtype_list, struct memtype, nd);
-
/* Search for existing mapping that overlaps the current range */
where = NULL;
- list_for_each_entry_continue(entry, &memtype_list, nd) {
+ list_for_each_entry(entry, &memtype_list, nd) {
if (end <= entry->start) {
where = entry->nd.prev;
- cached_entry = list_entry(where, struct memtype, nd);
break;
} else if (start <= entry->start) { /* end > entry->start */
err = chk_conflict(new, entry, new_type);
dprintk("Overlap at 0x%Lx-0x%Lx\n",
entry->start, entry->end);
where = entry->nd.prev;
- cached_entry = list_entry(where,
- struct memtype, nd);
}
break;
} else if (start < entry->end) { /* start > entry->start */
if (!err) {
dprintk("Overlap at 0x%Lx-0x%Lx\n",
entry->start, entry->end);
- cached_entry = list_entry(entry->nd.prev,
- struct memtype, nd);
/*
* Move to right position in the linked
return err;
}
- cached_start = start;
-
if (where)
list_add(&new->nd, where);
else
list_add_tail(&new->nd, &memtype_list);
+ memtype_rb_insert(&memtype_rbroot, new);
+
spin_unlock(&memtype_lock);
dprintk("reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s, ret %s\n",
int free_memtype(u64 start, u64 end)
{
- struct memtype *entry;
+ struct memtype *entry, *saved_entry;
int err = -EINVAL;
int is_range_ram;
return 0;
/* Low ISA region is always mapped WB. No need to track */
- if (is_ISA_range(start, end - 1))
+ if (x86_platform.is_untracked_pat_range(start, end))
return 0;
is_range_ram = pat_pagerange_is_ram(start, end);
- if (is_range_ram == 1)
- return free_ram_pages_type(start, end);
- else if (is_range_ram < 0)
+ if (is_range_ram == 1) {
+
+ spin_lock(&memtype_lock);
+ err = free_ram_pages_type(start, end);
+ spin_unlock(&memtype_lock);
+
+ return err;
+ } else if (is_range_ram < 0) {
return -EINVAL;
+ }
spin_lock(&memtype_lock);
- list_for_each_entry(entry, &memtype_list, nd) {
+
+ entry = memtype_rb_search(&memtype_rbroot, start);
+ if (unlikely(entry == NULL))
+ goto unlock_ret;
+
+ /*
+ * Saved entry points to an entry with start same or less than what
+ * we searched for. Now go through the list in both directions to look
+ * for the entry that matches with both start and end, with list stored
+ * in sorted start address
+ */
+ saved_entry = entry;
+ list_for_each_entry_from(entry, &memtype_list, nd) {
if (entry->start == start && entry->end == end) {
- if (cached_entry == entry || cached_start == start)
- cached_entry = NULL;
+ rb_erase(&entry->rb, &memtype_rbroot);
+ list_del(&entry->nd);
+ kfree(entry);
+ err = 0;
+ break;
+ } else if (entry->start > start) {
+ break;
+ }
+ }
+
+ if (!err)
+ goto unlock_ret;
+ entry = saved_entry;
+ list_for_each_entry_reverse(entry, &memtype_list, nd) {
+ if (entry->start == start && entry->end == end) {
+ rb_erase(&entry->rb, &memtype_rbroot);
list_del(&entry->nd);
kfree(entry);
err = 0;
break;
+ } else if (entry->start < start) {
+ break;
}
}
+unlock_ret:
spin_unlock(&memtype_lock);
if (err) {
}
+/**
+ * lookup_memtype - Looksup the memory type for a physical address
+ * @paddr: physical address of which memory type needs to be looked up
+ *
+ * Only to be called when PAT is enabled
+ *
+ * Returns _PAGE_CACHE_WB, _PAGE_CACHE_WC, _PAGE_CACHE_UC_MINUS or
+ * _PAGE_CACHE_UC
+ */
+static unsigned long lookup_memtype(u64 paddr)
+{
+ int rettype = _PAGE_CACHE_WB;
+ struct memtype *entry;
+
+ if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE))
+ return rettype;
+
+ if (pat_pagerange_is_ram(paddr, paddr + PAGE_SIZE)) {
+ struct page *page;
+ spin_lock(&memtype_lock);
+ page = pfn_to_page(paddr >> PAGE_SHIFT);
+ rettype = get_page_memtype(page);
+ spin_unlock(&memtype_lock);
+ /*
+ * -1 from get_page_memtype() implies RAM page is in its
+ * default state and not reserved, and hence of type WB
+ */
+ if (rettype == -1)
+ rettype = _PAGE_CACHE_WB;
+
+ return rettype;
+ }
+
+ spin_lock(&memtype_lock);
+
+ entry = memtype_rb_search(&memtype_rbroot, paddr);
+ if (entry != NULL)
+ rettype = entry->type;
+ else
+ rettype = _PAGE_CACHE_UC_MINUS;
+
+ spin_unlock(&memtype_lock);
+ return rettype;
+}
+
+/**
+ * io_reserve_memtype - Request a memory type mapping for a region of memory
+ * @start: start (physical address) of the region
+ * @end: end (physical address) of the region
+ * @type: A pointer to memtype, with requested type. On success, requested
+ * or any other compatible type that was available for the region is returned
+ *
+ * On success, returns 0
+ * On failure, returns non-zero
+ */
+int io_reserve_memtype(resource_size_t start, resource_size_t end,
+ unsigned long *type)
+{
+ resource_size_t size = end - start;
+ unsigned long req_type = *type;
+ unsigned long new_type;
+ int ret;
+
+ WARN_ON_ONCE(iomem_map_sanity_check(start, size));
+
+ ret = reserve_memtype(start, end, req_type, &new_type);
+ if (ret)
+ goto out_err;
+
+ if (!is_new_memtype_allowed(start, size, req_type, new_type))
+ goto out_free;
+
+ if (kernel_map_sync_memtype(start, size, new_type) < 0)
+ goto out_free;
+
+ *type = new_type;
+ return 0;
+
+out_free:
+ free_memtype(start, end);
+ ret = -EBUSY;
+out_err:
+ return ret;
+}
+
+/**
+ * io_free_memtype - Release a memory type mapping for a region of memory
+ * @start: start (physical address) of the region
+ * @end: end (physical address) of the region
+ */
+void io_free_memtype(resource_size_t start, resource_size_t end)
+{
+ free_memtype(start, end);
+}
+
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot)
{
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 = -1;
- int retval;
+ unsigned long flags = _PAGE_CACHE_WB;
if (!range_is_allowed(pfn, size))
return 0;
- if (file->f_flags & O_SYNC) {
+ if (file->f_flags & O_DSYNC)
flags = _PAGE_CACHE_UC_MINUS;
- }
#ifdef CONFIG_X86_32
/*
}
#endif
- /*
- * With O_SYNC, we can only take UC_MINUS mapping. Fail if we cannot.
- *
- * Without O_SYNC, we want to get
- * - WB for WB-able memory and no other conflicting mappings
- * - UC_MINUS for non-WB-able memory with no other conflicting mappings
- * - Inherit from confliting mappings otherwise
- */
- if (flags != -1) {
- retval = reserve_memtype(offset, offset + size, flags, NULL);
- } else {
- retval = reserve_memtype(offset, offset + size, -1, &flags);
- }
-
- if (retval < 0)
- return 0;
-
- if (((pfn < max_low_pfn_mapped) ||
- (pfn >= (1UL<<(32 - PAGE_SHIFT)) && pfn < max_pfn_mapped)) &&
- ioremap_change_attr((unsigned long)__va(offset), size, flags) < 0) {
- free_memtype(offset, offset + size);
- printk(KERN_INFO
- "%s:%d /dev/mem ioremap_change_attr failed %s for %Lx-%Lx\n",
- current->comm, current->pid,
- cattr_name(flags),
- offset, (unsigned long long)(offset + size));
- return 0;
- }
-
*vma_prot = __pgprot((pgprot_val(*vma_prot) & ~_PAGE_CACHE_MASK) |
flags);
return 1;
}
-void map_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
-{
- unsigned long want_flags = (pgprot_val(vma_prot) & _PAGE_CACHE_MASK);
- u64 addr = (u64)pfn << PAGE_SHIFT;
- unsigned long flags;
-
- reserve_memtype(addr, addr + size, want_flags, &flags);
- if (flags != want_flags) {
- printk(KERN_INFO
- "%s:%d /dev/mem expected mapping type %s for %Lx-%Lx, got %s\n",
- current->comm, current->pid,
- cattr_name(want_flags),
- addr, (unsigned long long)(addr + size),
- cattr_name(flags));
- }
-}
-
-void unmap_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
-{
- u64 addr = (u64)pfn << PAGE_SHIFT;
-
- free_memtype(addr, addr + size);
-}
-
/*
* Change the memory type for the physial address range in kernel identity
* mapping space if that range is a part of identity map.
{
unsigned long id_sz;
- if (!pat_enabled || base >= __pa(high_memory))
+ if (base >= __pa(high_memory))
return 0;
id_sz = (__pa(high_memory) < base + size) ?
{
int is_ram = 0;
int ret;
- unsigned long flags;
unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
+ unsigned long flags = want_flags;
is_ram = pat_pagerange_is_ram(paddr, paddr + size);
/*
- * reserve_pfn_range() doesn't support RAM pages.
+ * reserve_pfn_range() for RAM pages. We do not refcount to keep
+ * track of number of mappings of RAM pages. We can assert that
+ * the type requested matches the type of first page in the range.
*/
- if (is_ram != 0)
- return -EINVAL;
+ if (is_ram) {
+ if (!pat_enabled)
+ return 0;
+
+ flags = lookup_memtype(paddr);
+ if (want_flags != flags) {
+ printk(KERN_WARNING
+ "%s:%d map pfn RAM range req %s for %Lx-%Lx, got %s\n",
+ current->comm, current->pid,
+ cattr_name(want_flags),
+ (unsigned long long)paddr,
+ (unsigned long long)(paddr + size),
+ cattr_name(flags));
+ *vma_prot = __pgprot((pgprot_val(*vma_prot) &
+ (~_PAGE_CACHE_MASK)) |
+ flags);
+ }
+ return 0;
+ }
ret = reserve_memtype(paddr, paddr + size, want_flags, &flags);
if (ret)
return ret;
if (flags != want_flags) {
- if (strict_prot || !is_new_memtype_allowed(want_flags, flags)) {
+ if (strict_prot ||
+ !is_new_memtype_allowed(paddr, size, want_flags, flags)) {
free_memtype(paddr, paddr + size);
printk(KERN_ERR "%s:%d map pfn expected mapping type %s"
" for %Lx-%Lx, got %s\n",
*
* If the vma has a linear pfn mapping for the entire range, we get the prot
* from pte and reserve the entire vma range with single reserve_pfn_range call.
- * Otherwise, we reserve the entire vma range, my ging through the PTEs page
- * by page to get physical address and protection.
*/
int track_pfn_vma_copy(struct vm_area_struct *vma)
{
- int retval = 0;
- unsigned long i, j;
resource_size_t paddr;
unsigned long prot;
- unsigned long vma_start = vma->vm_start;
- unsigned long vma_end = vma->vm_end;
- unsigned long vma_size = vma_end - vma_start;
+ unsigned long vma_size = vma->vm_end - vma->vm_start;
pgprot_t pgprot;
- if (!pat_enabled)
- return 0;
-
if (is_linear_pfn_mapping(vma)) {
/*
* reserve the whole chunk covered by vma. We need the
* starting address and protection from pte.
*/
- if (follow_phys(vma, vma_start, 0, &prot, &paddr)) {
+ if (follow_phys(vma, vma->vm_start, 0, &prot, &paddr)) {
WARN_ON_ONCE(1);
return -EINVAL;
}
return reserve_pfn_range(paddr, vma_size, &pgprot, 1);
}
- /* reserve entire vma page by page, using pfn and prot from pte */
- for (i = 0; i < vma_size; i += PAGE_SIZE) {
- if (follow_phys(vma, vma_start + i, 0, &prot, &paddr))
- continue;
-
- pgprot = __pgprot(prot);
- retval = reserve_pfn_range(paddr, PAGE_SIZE, &pgprot, 1);
- if (retval)
- goto cleanup_ret;
- }
return 0;
-
-cleanup_ret:
- /* Reserve error: Cleanup partial reservation and return error */
- for (j = 0; j < i; j += PAGE_SIZE) {
- if (follow_phys(vma, vma_start + j, 0, &prot, &paddr))
- continue;
-
- free_pfn_range(paddr, PAGE_SIZE);
- }
-
- return retval;
}
/*
* prot is passed in as a parameter for the new mapping. If the vma has a
* linear pfn mapping for the entire range reserve the entire vma range with
* single reserve_pfn_range call.
- * Otherwise, we look t the pfn and size and reserve only the specified range
- * page by page.
- *
- * Note that this function can be called with caller trying to map only a
- * subrange/page inside the vma.
*/
int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
unsigned long pfn, unsigned long size)
{
- int retval = 0;
- unsigned long i, j;
- resource_size_t base_paddr;
+ unsigned long flags;
resource_size_t paddr;
- unsigned long vma_start = vma->vm_start;
- unsigned long vma_end = vma->vm_end;
- unsigned long vma_size = vma_end - vma_start;
-
- if (!pat_enabled)
- return 0;
+ unsigned long vma_size = vma->vm_end - vma->vm_start;
if (is_linear_pfn_mapping(vma)) {
/* reserve the whole chunk starting from vm_pgoff */
return reserve_pfn_range(paddr, vma_size, prot, 0);
}
- /* reserve page by page using pfn and size */
- base_paddr = (resource_size_t)pfn << PAGE_SHIFT;
- for (i = 0; i < size; i += PAGE_SIZE) {
- paddr = base_paddr + i;
- retval = reserve_pfn_range(paddr, PAGE_SIZE, prot, 0);
- if (retval)
- goto cleanup_ret;
- }
- return 0;
+ if (!pat_enabled)
+ return 0;
-cleanup_ret:
- /* Reserve error: Cleanup partial reservation and return error */
- for (j = 0; j < i; j += PAGE_SIZE) {
- paddr = base_paddr + j;
- free_pfn_range(paddr, PAGE_SIZE);
- }
+ /* for vm_insert_pfn and friends, we set prot based on lookup */
+ flags = lookup_memtype(pfn << PAGE_SHIFT);
+ *prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) |
+ flags);
- return retval;
+ return 0;
}
/*
void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
unsigned long size)
{
- unsigned long i;
resource_size_t paddr;
- unsigned long prot;
- unsigned long vma_start = vma->vm_start;
- unsigned long vma_end = vma->vm_end;
- unsigned long vma_size = vma_end - vma_start;
-
- if (!pat_enabled)
- return;
+ unsigned long vma_size = vma->vm_end - vma->vm_start;
if (is_linear_pfn_mapping(vma)) {
/* free the whole chunk starting from vm_pgoff */
free_pfn_range(paddr, vma_size);
return;
}
-
- if (size != 0 && size != vma_size) {
- /* free page by page, using pfn and size */
- paddr = (resource_size_t)pfn << PAGE_SHIFT;
- for (i = 0; i < size; i += PAGE_SIZE) {
- paddr = paddr + i;
- free_pfn_range(paddr, PAGE_SIZE);
- }
- } else {
- /* free entire vma, page by page, using the pfn from pte */
- for (i = 0; i < vma_size; i += PAGE_SIZE) {
- if (follow_phys(vma, vma_start + i, 0, &prot, &paddr))
- continue;
-
- free_pfn_range(paddr, PAGE_SIZE);
- }
- }
}
pgprot_t pgprot_writecombine(pgprot_t prot)
return 0;
}
-static struct seq_operations memtype_seq_ops = {
+static const struct seq_operations memtype_seq_ops = {
.start = memtype_seq_start,
.next = memtype_seq_next,
.stop = memtype_seq_stop,
static int __init pat_memtype_list_init(void)
{
- debugfs_create_file("pat_memtype_list", S_IRUSR, arch_debugfs_dir,
- NULL, &memtype_fops);
+ if (pat_enabled) {
+ debugfs_create_file("pat_memtype_list", S_IRUSR,
+ arch_debugfs_dir, NULL, &memtype_fops);
+ }
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff