#include <asm/io.h>
#include "pat_internal.h"
+#include "mm_internal.h"
#ifdef CONFIG_X86_PAT
int __read_mostly pat_enabled = 1;
PAT_UC_MINUS = 7, /* UC, but can be overriden by MTRR */
};
+#define CM(c) (_PAGE_CACHE_MODE_ ## c)
+
+static enum page_cache_mode pat_get_cache_mode(unsigned pat_val, char *msg)
+{
+ enum page_cache_mode cache;
+ char *cache_mode;
+
+ switch (pat_val) {
+ case PAT_UC: cache = CM(UC); cache_mode = "UC "; break;
+ case PAT_WC: cache = CM(WC); cache_mode = "WC "; break;
+ case PAT_WT: cache = CM(WT); cache_mode = "WT "; break;
+ case PAT_WP: cache = CM(WP); cache_mode = "WP "; break;
+ case PAT_WB: cache = CM(WB); cache_mode = "WB "; break;
+ case PAT_UC_MINUS: cache = CM(UC_MINUS); cache_mode = "UC- "; break;
+ default: cache = CM(WB); cache_mode = "WB "; break;
+ }
+
+ memcpy(msg, cache_mode, 4);
+
+ return cache;
+}
+
+#undef CM
+
+/*
+ * Update the cache mode to pgprot translation tables according to PAT
+ * configuration.
+ * Using lower indices is preferred, so we start with highest index.
+ */
+void pat_init_cache_modes(void)
+{
+ int i;
+ enum page_cache_mode cache;
+ char pat_msg[33];
+ u64 pat;
+
+ rdmsrl(MSR_IA32_CR_PAT, pat);
+ pat_msg[32] = 0;
+ for (i = 7; i >= 0; i--) {
+ cache = pat_get_cache_mode((pat >> (i * 8)) & 7,
+ pat_msg + 4 * i);
+ update_cache_mode_entry(i, cache);
+ }
+ pr_info("PAT configuration [0-7]: %s\n", pat_msg);
+}
+
#define PAT(x, y) ((u64)PAT_ ## y << ((x)*8))
void pat_init(void)
wrmsrl(MSR_IA32_CR_PAT, 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);
+ pat_init_cache_modes();
}
#undef PAT
* The intersection is based on "Effective Memory Type" tables in IA-32
* SDM vol 3a
*/
-static unsigned long pat_x_mtrr_type(u64 start, u64 end, unsigned long req_type)
+static unsigned long pat_x_mtrr_type(u64 start, u64 end,
+ enum page_cache_mode req_type)
{
/*
* Look for MTRR hint to get the effective type in case where PAT
* request is for WB.
*/
- if (req_type == _PAGE_CACHE_WB) {
+ if (req_type == _PAGE_CACHE_MODE_WB) {
u8 mtrr_type;
mtrr_type = mtrr_type_lookup(start, end);
if (mtrr_type != MTRR_TYPE_WRBACK)
- return _PAGE_CACHE_UC_MINUS;
+ return _PAGE_CACHE_MODE_UC_MINUS;
- return _PAGE_CACHE_WB;
+ return _PAGE_CACHE_MODE_WB;
}
return req_type;
* - 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
*/
-static int reserve_ram_pages_type(u64 start, u64 end, unsigned long req_type,
- unsigned long *new_type)
+static int reserve_ram_pages_type(u64 start, u64 end,
+ enum page_cache_mode req_type,
+ enum page_cache_mode *new_type)
{
struct page *page;
u64 pfn;
- if (req_type == _PAGE_CACHE_UC) {
+ if (req_type == _PAGE_CACHE_MODE_UC) {
/* We do not support strong UC */
WARN_ON_ONCE(1);
- req_type = _PAGE_CACHE_UC_MINUS;
+ req_type = _PAGE_CACHE_MODE_UC_MINUS;
}
for (pfn = (start >> PAGE_SHIFT); pfn < (end >> PAGE_SHIFT); ++pfn) {
- unsigned long type;
+ enum page_cache_mode type;
page = pfn_to_page(pfn);
type = get_page_memtype(page);
if (type != -1) {
- printk(KERN_INFO "reserve_ram_pages_type failed [mem %#010Lx-%#010Lx], track 0x%lx, req 0x%lx\n",
+ pr_info("reserve_ram_pages_type failed [mem %#010Lx-%#010Lx], track 0x%x, req 0x%x\n",
start, end - 1, type, req_type);
if (new_type)
*new_type = type;
/*
* req_type typically has one of the:
- * - _PAGE_CACHE_WB
- * - _PAGE_CACHE_WC
- * - _PAGE_CACHE_UC_MINUS
- * - _PAGE_CACHE_UC
+ * - _PAGE_CACHE_MODE_WB
+ * - _PAGE_CACHE_MODE_WC
+ * - _PAGE_CACHE_MODE_UC_MINUS
+ * - _PAGE_CACHE_MODE_UC
*
* 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
* it will return a negative return value.
*/
-int reserve_memtype(u64 start, u64 end, unsigned long req_type,
- unsigned long *new_type)
+int reserve_memtype(u64 start, u64 end, enum page_cache_mode req_type,
+ enum page_cache_mode *new_type)
{
struct memtype *new;
- unsigned long actual_type;
+ enum page_cache_mode actual_type;
int is_range_ram;
int err = 0;
if (!pat_enabled) {
/* This is identical to page table setting without PAT */
if (new_type) {
- if (req_type == _PAGE_CACHE_WC)
- *new_type = _PAGE_CACHE_UC_MINUS;
+ if (req_type == _PAGE_CACHE_MODE_WC)
+ *new_type = _PAGE_CACHE_MODE_UC_MINUS;
else
- *new_type = req_type & _PAGE_CACHE_MASK;
+ *new_type = req_type;
}
return 0;
}
/* Low ISA region is always mapped WB in page table. No need to track */
if (x86_platform.is_untracked_pat_range(start, end)) {
if (new_type)
- *new_type = _PAGE_CACHE_WB;
+ *new_type = _PAGE_CACHE_MODE_WB;
return 0;
}
* 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);
+ actual_type = pat_x_mtrr_type(start, end, req_type);
if (new_type)
*new_type = actual_type;
*
* Only to be called when PAT is enabled
*
- * Returns _PAGE_CACHE_WB, _PAGE_CACHE_WC, _PAGE_CACHE_UC_MINUS or
- * _PAGE_CACHE_UC
+ * Returns _PAGE_CACHE_MODE_WB, _PAGE_CACHE_MODE_WC, _PAGE_CACHE_MODE_UC_MINUS
+ * or _PAGE_CACHE_MODE_UC
*/
-static unsigned long lookup_memtype(u64 paddr)
+static enum page_cache_mode lookup_memtype(u64 paddr)
{
- int rettype = _PAGE_CACHE_WB;
+ enum page_cache_mode rettype = _PAGE_CACHE_MODE_WB;
struct memtype *entry;
if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE))
* default state and not reserved, and hence of type WB
*/
if (rettype == -1)
- rettype = _PAGE_CACHE_WB;
+ rettype = _PAGE_CACHE_MODE_WB;
return rettype;
}
if (entry != NULL)
rettype = entry->type;
else
- rettype = _PAGE_CACHE_UC_MINUS;
+ rettype = _PAGE_CACHE_MODE_UC_MINUS;
spin_unlock(&memtype_lock);
return rettype;
* On failure, returns non-zero
*/
int io_reserve_memtype(resource_size_t start, resource_size_t end,
- unsigned long *type)
+ enum page_cache_mode *type)
{
resource_size_t size = end - start;
- unsigned long req_type = *type;
- unsigned long new_type;
+ enum page_cache_mode req_type = *type;
+ enum page_cache_mode new_type;
int ret;
WARN_ON_ONCE(iomem_map_sanity_check(start, size));
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t *vma_prot)
{
- unsigned long flags = _PAGE_CACHE_WB;
+ enum page_cache_mode pcm = _PAGE_CACHE_MODE_WB;
if (!range_is_allowed(pfn, size))
return 0;
if (file->f_flags & O_DSYNC)
- flags = _PAGE_CACHE_UC_MINUS;
+ pcm = _PAGE_CACHE_MODE_UC_MINUS;
#ifdef CONFIG_X86_32
/*
boot_cpu_has(X86_FEATURE_CYRIX_ARR) ||
boot_cpu_has(X86_FEATURE_CENTAUR_MCR)) &&
(pfn << PAGE_SHIFT) >= __pa(high_memory)) {
- flags = _PAGE_CACHE_UC;
+ pcm = _PAGE_CACHE_MODE_UC;
}
#endif
*vma_prot = __pgprot((pgprot_val(*vma_prot) & ~_PAGE_CACHE_MASK) |
- flags);
+ cachemode2protval(pcm));
return 1;
}
* Change the memory type for the physial address range in kernel identity
* mapping space if that range is a part of identity map.
*/
-int kernel_map_sync_memtype(u64 base, unsigned long size, unsigned long flags)
+int kernel_map_sync_memtype(u64 base, unsigned long size,
+ enum page_cache_mode pcm)
{
unsigned long id_sz;
__pa(high_memory) - base :
size;
- if (ioremap_change_attr((unsigned long)__va(base), id_sz, flags) < 0) {
+ if (ioremap_change_attr((unsigned long)__va(base), id_sz, pcm) < 0) {
printk(KERN_INFO "%s:%d ioremap_change_attr failed %s "
"for [mem %#010Lx-%#010Lx]\n",
current->comm, current->pid,
- cattr_name(flags),
+ cattr_name(pcm),
base, (unsigned long long)(base + size-1));
return -EINVAL;
}
{
int is_ram = 0;
int ret;
- unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
- unsigned long flags = want_flags;
+ enum page_cache_mode want_pcm = pgprot2cachemode(*vma_prot);
+ enum page_cache_mode pcm = want_pcm;
is_ram = pat_pagerange_is_ram(paddr, paddr + size);
if (!pat_enabled)
return 0;
- flags = lookup_memtype(paddr);
- if (want_flags != flags) {
+ pcm = lookup_memtype(paddr);
+ if (want_pcm != pcm) {
printk(KERN_WARNING "%s:%d map pfn RAM range req %s for [mem %#010Lx-%#010Lx], got %s\n",
current->comm, current->pid,
- cattr_name(want_flags),
+ cattr_name(want_pcm),
(unsigned long long)paddr,
(unsigned long long)(paddr + size - 1),
- cattr_name(flags));
+ cattr_name(pcm));
*vma_prot = __pgprot((pgprot_val(*vma_prot) &
- (~_PAGE_CACHE_MASK)) |
- flags);
+ (~_PAGE_CACHE_MASK)) |
+ cachemode2protval(pcm));
}
return 0;
}
- ret = reserve_memtype(paddr, paddr + size, want_flags, &flags);
+ ret = reserve_memtype(paddr, paddr + size, want_pcm, &pcm);
if (ret)
return ret;
- if (flags != want_flags) {
+ if (pcm != want_pcm) {
if (strict_prot ||
- !is_new_memtype_allowed(paddr, size, want_flags, flags)) {
+ !is_new_memtype_allowed(paddr, size, want_pcm, pcm)) {
free_memtype(paddr, paddr + size);
printk(KERN_ERR "%s:%d map pfn expected mapping type %s"
" for [mem %#010Lx-%#010Lx], got %s\n",
current->comm, current->pid,
- cattr_name(want_flags),
+ cattr_name(want_pcm),
(unsigned long long)paddr,
(unsigned long long)(paddr + size - 1),
- cattr_name(flags));
+ cattr_name(pcm));
return -EINVAL;
}
/*
*/
*vma_prot = __pgprot((pgprot_val(*vma_prot) &
(~_PAGE_CACHE_MASK)) |
- flags);
+ cachemode2protval(pcm));
}
- if (kernel_map_sync_memtype(paddr, size, flags) < 0) {
+ if (kernel_map_sync_memtype(paddr, size, pcm) < 0) {
free_memtype(paddr, paddr + size);
return -EINVAL;
}
unsigned long pfn, unsigned long addr, unsigned long size)
{
resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT;
- unsigned long flags;
+ enum page_cache_mode pcm;
/* reserve the whole chunk starting from paddr */
if (addr == vma->vm_start && size == (vma->vm_end - vma->vm_start)) {
* For anything smaller than the vma size we set prot based on the
* lookup.
*/
- flags = lookup_memtype(paddr);
+ pcm = lookup_memtype(paddr);
/* Check memtype for the remaining pages */
while (size > PAGE_SIZE) {
size -= PAGE_SIZE;
paddr += PAGE_SIZE;
- if (flags != lookup_memtype(paddr))
+ if (pcm != lookup_memtype(paddr))
return -EINVAL;
}
*prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) |
- flags);
+ cachemode2protval(pcm));
return 0;
}
int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
unsigned long pfn)
{
- unsigned long flags;
+ enum page_cache_mode pcm;
if (!pat_enabled)
return 0;
/* Set prot based on lookup */
- flags = lookup_memtype((resource_size_t)pfn << PAGE_SHIFT);
+ pcm = lookup_memtype((resource_size_t)pfn << PAGE_SHIFT);
*prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) |
- flags);
+ cachemode2protval(pcm));
return 0;
}
pgprot_t pgprot_writecombine(pgprot_t prot)
{
if (pat_enabled)
- return __pgprot(pgprot_val(prot) | _PAGE_CACHE_WC);
+ return __pgprot(pgprot_val(prot) |
+ cachemode2protval(_PAGE_CACHE_MODE_WC));
else
return pgprot_noncached(prot);
}
projects / mirror_ubuntu-bionic-kernel.git / blobdiff