x86, pageattr: introduce APIs to change pageattr of a page array
Add array interface APIs of pageattr. page based cache flush is quite slow for a lot of pages. If pages are more than 1024 (4M), the patch will use a wbinvd(). We have a simple test here (run a 3d game - open arena), nearly all agp memory allocation are small (< 1M), so suppose this will not impact runtime performance. Signed-off-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Shaohua Li
Ingo Molnar
Родитель
cacf890694
Коммит
d75586ad01
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@ -25,15 +25,19 @@
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* The current flushing context - we pass it instead of 5 arguments:
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*/
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struct cpa_data {
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unsigned long vaddr;
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unsigned long *vaddr;
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pgprot_t mask_set;
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pgprot_t mask_clr;
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int numpages;
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int flushtlb;
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int flags;
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unsigned long pfn;
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unsigned force_split : 1;
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int curpage;
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};
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#define CPA_FLUSHTLB 1
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#define CPA_ARRAY 2
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#ifdef CONFIG_PROC_FS
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static unsigned long direct_pages_count[PG_LEVEL_NUM];
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@ -184,6 +188,41 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache)
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}
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}
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static void cpa_flush_array(unsigned long *start, int numpages, int cache)
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{
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unsigned int i, level;
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unsigned long *addr;
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BUG_ON(irqs_disabled());
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on_each_cpu(__cpa_flush_range, NULL, 1);
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if (!cache)
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return;
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/* 4M threshold */
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if (numpages >= 1024) {
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if (boot_cpu_data.x86_model >= 4)
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wbinvd();
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return;
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}
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/*
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* We only need to flush on one CPU,
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* clflush is a MESI-coherent instruction that
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* will cause all other CPUs to flush the same
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* cachelines:
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*/
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for (i = 0, addr = start; i < numpages; i++, addr++) {
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pte_t *pte = lookup_address(*addr, &level);
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/*
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* Only flush present addresses:
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*/
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if (pte && (pte_val(*pte) & _PAGE_PRESENT))
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clflush_cache_range((void *) *addr, PAGE_SIZE);
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}
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}
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/*
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* Certain areas of memory on x86 require very specific protection flags,
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* for example the BIOS area or kernel text. Callers don't always get this
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@ -392,7 +431,7 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
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*/
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new_pte = pfn_pte(pte_pfn(old_pte), canon_pgprot(new_prot));
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__set_pmd_pte(kpte, address, new_pte);
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cpa->flushtlb = 1;
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cpa->flags |= CPA_FLUSHTLB;
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do_split = 0;
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}
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@ -578,11 +617,16 @@ out_unlock:
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static int __change_page_attr(struct cpa_data *cpa, int primary)
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{
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unsigned long address = cpa->vaddr;
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unsigned long address;
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int do_split, err;
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unsigned int level;
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pte_t *kpte, old_pte;
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if (cpa->flags & CPA_ARRAY)
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address = cpa->vaddr[cpa->curpage];
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else
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address = *cpa->vaddr;
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repeat:
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kpte = lookup_address(address, &level);
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if (!kpte)
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@ -594,8 +638,8 @@ repeat:
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return 0;
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printk(KERN_WARNING "CPA: called for zero pte. "
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"vaddr = %lx cpa->vaddr = %lx\n", address,
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cpa->vaddr);
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WARN_ON(1);
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*cpa->vaddr);
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return -EINVAL;
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}
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@ -621,7 +665,7 @@ repeat:
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*/
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if (pte_val(old_pte) != pte_val(new_pte)) {
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set_pte_atomic(kpte, new_pte);
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cpa->flushtlb = 1;
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cpa->flags |= CPA_FLUSHTLB;
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}
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cpa->numpages = 1;
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return 0;
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@ -645,7 +689,7 @@ repeat:
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*/
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err = split_large_page(kpte, address);
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if (!err) {
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cpa->flushtlb = 1;
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cpa->flags |= CPA_FLUSHTLB;
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goto repeat;
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}
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@ -658,6 +702,7 @@ static int cpa_process_alias(struct cpa_data *cpa)
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{
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struct cpa_data alias_cpa;
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int ret = 0;
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unsigned long temp_cpa_vaddr, vaddr;
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if (cpa->pfn >= max_pfn_mapped)
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return 0;
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@ -670,16 +715,24 @@ static int cpa_process_alias(struct cpa_data *cpa)
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* No need to redo, when the primary call touched the direct
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* mapping already:
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*/
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if (!(within(cpa->vaddr, PAGE_OFFSET,
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if (cpa->flags & CPA_ARRAY)
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vaddr = cpa->vaddr[cpa->curpage];
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else
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vaddr = *cpa->vaddr;
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if (!(within(vaddr, PAGE_OFFSET,
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PAGE_OFFSET + (max_low_pfn_mapped << PAGE_SHIFT))
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#ifdef CONFIG_X86_64
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|| within(cpa->vaddr, PAGE_OFFSET + (1UL<<32),
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|| within(vaddr, PAGE_OFFSET + (1UL<<32),
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PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT))
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#endif
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)) {
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alias_cpa = *cpa;
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alias_cpa.vaddr = (unsigned long) __va(cpa->pfn << PAGE_SHIFT);
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temp_cpa_vaddr = (unsigned long) __va(cpa->pfn << PAGE_SHIFT);
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alias_cpa.vaddr = &temp_cpa_vaddr;
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alias_cpa.flags &= ~CPA_ARRAY;
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ret = __change_page_attr_set_clr(&alias_cpa, 0);
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}
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@ -691,7 +744,7 @@ static int cpa_process_alias(struct cpa_data *cpa)
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* No need to redo, when the primary call touched the high
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* mapping already:
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*/
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if (within(cpa->vaddr, (unsigned long) _text, (unsigned long) _end))
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if (within(vaddr, (unsigned long) _text, (unsigned long) _end))
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return 0;
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/*
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@ -702,8 +755,9 @@ static int cpa_process_alias(struct cpa_data *cpa)
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return 0;
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alias_cpa = *cpa;
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alias_cpa.vaddr =
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(cpa->pfn << PAGE_SHIFT) + __START_KERNEL_map - phys_base;
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temp_cpa_vaddr = (cpa->pfn << PAGE_SHIFT) + __START_KERNEL_map - phys_base;
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alias_cpa.vaddr = &temp_cpa_vaddr;
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alias_cpa.flags &= ~CPA_ARRAY;
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/*
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* The high mapping range is imprecise, so ignore the return value.
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@ -723,6 +777,9 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias)
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* preservation check.
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*/
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cpa->numpages = numpages;
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/* for array changes, we can't use large page */
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if (cpa->flags & CPA_ARRAY)
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cpa->numpages = 1;
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ret = __change_page_attr(cpa, checkalias);
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if (ret)
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@ -741,7 +798,11 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias)
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*/
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BUG_ON(cpa->numpages > numpages);
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numpages -= cpa->numpages;
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cpa->vaddr += cpa->numpages * PAGE_SIZE;
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if (cpa->flags & CPA_ARRAY)
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cpa->curpage++;
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else
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*cpa->vaddr += cpa->numpages * PAGE_SIZE;
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}
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return 0;
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}
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@ -752,9 +813,9 @@ static inline int cache_attr(pgprot_t attr)
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(_PAGE_PAT | _PAGE_PAT_LARGE | _PAGE_PWT | _PAGE_PCD);
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}
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static int change_page_attr_set_clr(unsigned long addr, int numpages,
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static int change_page_attr_set_clr(unsigned long *addr, int numpages,
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pgprot_t mask_set, pgprot_t mask_clr,
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int force_split)
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int force_split, int array)
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{
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struct cpa_data cpa;
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int ret, cache, checkalias;
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@ -769,12 +830,22 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
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return 0;
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/* Ensure we are PAGE_SIZE aligned */
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if (addr & ~PAGE_MASK) {
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addr &= PAGE_MASK;
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/*
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* People should not be passing in unaligned addresses:
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*/
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WARN_ON_ONCE(1);
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if (!array) {
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if (*addr & ~PAGE_MASK) {
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*addr &= PAGE_MASK;
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/*
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* People should not be passing in unaligned addresses:
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*/
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WARN_ON_ONCE(1);
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}
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} else {
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int i;
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for (i = 0; i < numpages; i++) {
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if (addr[i] & ~PAGE_MASK) {
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addr[i] &= PAGE_MASK;
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WARN_ON_ONCE(1);
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}
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}
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}
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/* Must avoid aliasing mappings in the highmem code */
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@ -784,9 +855,13 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
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cpa.numpages = numpages;
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cpa.mask_set = mask_set;
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cpa.mask_clr = mask_clr;
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cpa.flushtlb = 0;
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cpa.flags = 0;
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cpa.curpage = 0;
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cpa.force_split = force_split;
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if (array)
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cpa.flags |= CPA_ARRAY;
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/* No alias checking for _NX bit modifications */
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checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX;
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@ -795,7 +870,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
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/*
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* Check whether we really changed something:
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*/
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if (!cpa.flushtlb)
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if (!(cpa.flags & CPA_FLUSHTLB))
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goto out;
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/*
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@ -810,9 +885,12 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
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* error case we fall back to cpa_flush_all (which uses
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* wbindv):
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*/
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if (!ret && cpu_has_clflush)
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cpa_flush_range(addr, numpages, cache);
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else
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if (!ret && cpu_has_clflush) {
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if (cpa.flags & CPA_ARRAY)
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cpa_flush_array(addr, numpages, cache);
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else
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cpa_flush_range(*addr, numpages, cache);
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} else
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cpa_flush_all(cache);
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out:
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@ -821,16 +899,18 @@ out:
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return ret;
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}
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static inline int change_page_attr_set(unsigned long addr, int numpages,
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pgprot_t mask)
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static inline int change_page_attr_set(unsigned long *addr, int numpages,
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pgprot_t mask, int array)
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{
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return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0), 0);
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return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0), 0,
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array);
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}
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static inline int change_page_attr_clear(unsigned long addr, int numpages,
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pgprot_t mask)
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static inline int change_page_attr_clear(unsigned long *addr, int numpages,
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pgprot_t mask, int array)
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{
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return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask, 0);
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return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask, 0,
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array);
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}
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int _set_memory_uc(unsigned long addr, int numpages)
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@ -838,8 +918,8 @@ int _set_memory_uc(unsigned long addr, int numpages)
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/*
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* for now UC MINUS. see comments in ioremap_nocache()
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*/
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return change_page_attr_set(addr, numpages,
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__pgprot(_PAGE_CACHE_UC_MINUS));
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return change_page_attr_set(&addr, numpages,
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__pgprot(_PAGE_CACHE_UC_MINUS), 0);
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}
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int set_memory_uc(unsigned long addr, int numpages)
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@ -855,10 +935,31 @@ int set_memory_uc(unsigned long addr, int numpages)
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}
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EXPORT_SYMBOL(set_memory_uc);
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int set_memory_array_uc(unsigned long *addr, int addrinarray)
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{
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int i;
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/*
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* for now UC MINUS. see comments in ioremap_nocache()
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*/
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for (i = 0; i < addrinarray; i++) {
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if (reserve_memtype(addr[i], addr[i] + PAGE_SIZE,
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_PAGE_CACHE_UC_MINUS, NULL))
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goto out;
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}
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return change_page_attr_set(addr, addrinarray,
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__pgprot(_PAGE_CACHE_UC_MINUS), 1);
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out:
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while (--i >= 0)
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free_memtype(addr[i], addr[i] + PAGE_SIZE);
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return -EINVAL;
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}
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EXPORT_SYMBOL(set_memory_array_uc);
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int _set_memory_wc(unsigned long addr, int numpages)
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{
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return change_page_attr_set(addr, numpages,
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__pgprot(_PAGE_CACHE_WC));
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return change_page_attr_set(&addr, numpages,
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__pgprot(_PAGE_CACHE_WC), 0);
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}
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int set_memory_wc(unsigned long addr, int numpages)
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@ -876,8 +977,8 @@ EXPORT_SYMBOL(set_memory_wc);
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int _set_memory_wb(unsigned long addr, int numpages)
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{
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return change_page_attr_clear(addr, numpages,
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__pgprot(_PAGE_CACHE_MASK));
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return change_page_attr_clear(&addr, numpages,
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__pgprot(_PAGE_CACHE_MASK), 0);
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}
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int set_memory_wb(unsigned long addr, int numpages)
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|
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@ -888,37 +989,48 @@ int set_memory_wb(unsigned long addr, int numpages)
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}
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EXPORT_SYMBOL(set_memory_wb);
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|
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int set_memory_array_wb(unsigned long *addr, int addrinarray)
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{
|
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int i;
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for (i = 0; i < addrinarray; i++)
|
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free_memtype(addr[i], addr[i] + PAGE_SIZE);
|
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|
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return change_page_attr_clear(addr, addrinarray,
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__pgprot(_PAGE_CACHE_MASK), 1);
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}
|
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EXPORT_SYMBOL(set_memory_array_wb);
|
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|
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int set_memory_x(unsigned long addr, int numpages)
|
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{
|
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return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_NX));
|
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return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_NX), 0);
|
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}
|
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EXPORT_SYMBOL(set_memory_x);
|
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|
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int set_memory_nx(unsigned long addr, int numpages)
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{
|
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return change_page_attr_set(addr, numpages, __pgprot(_PAGE_NX));
|
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return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_NX), 0);
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}
|
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EXPORT_SYMBOL(set_memory_nx);
|
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|
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int set_memory_ro(unsigned long addr, int numpages)
|
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{
|
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return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_RW));
|
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return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_RW), 0);
|
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}
|
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|
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int set_memory_rw(unsigned long addr, int numpages)
|
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{
|
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return change_page_attr_set(addr, numpages, __pgprot(_PAGE_RW));
|
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return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_RW), 0);
|
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}
|
||||
|
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int set_memory_np(unsigned long addr, int numpages)
|
||||
{
|
||||
return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_PRESENT));
|
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return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_PRESENT), 0);
|
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}
|
||||
|
||||
int set_memory_4k(unsigned long addr, int numpages)
|
||||
{
|
||||
return change_page_attr_set_clr(addr, numpages, __pgprot(0),
|
||||
__pgprot(0), 1);
|
||||
return change_page_attr_set_clr(&addr, numpages, __pgprot(0),
|
||||
__pgprot(0), 1, 0);
|
||||
}
|
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|
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int set_pages_uc(struct page *page, int numpages)
|
||||
|
|
@ -971,20 +1083,24 @@ int set_pages_rw(struct page *page, int numpages)
|
|||
|
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static int __set_pages_p(struct page *page, int numpages)
|
||||
{
|
||||
struct cpa_data cpa = { .vaddr = (unsigned long) page_address(page),
|
||||
unsigned long tempaddr = (unsigned long) page_address(page);
|
||||
struct cpa_data cpa = { .vaddr = &tempaddr,
|
||||
.numpages = numpages,
|
||||
.mask_set = __pgprot(_PAGE_PRESENT | _PAGE_RW),
|
||||
.mask_clr = __pgprot(0)};
|
||||
.mask_clr = __pgprot(0),
|
||||
.flags = 0};
|
||||
|
||||
return __change_page_attr_set_clr(&cpa, 1);
|
||||
}
|
||||
|
||||
static int __set_pages_np(struct page *page, int numpages)
|
||||
{
|
||||
struct cpa_data cpa = { .vaddr = (unsigned long) page_address(page),
|
||||
unsigned long tempaddr = (unsigned long) page_address(page);
|
||||
struct cpa_data cpa = { .vaddr = &tempaddr,
|
||||
.numpages = numpages,
|
||||
.mask_set = __pgprot(0),
|
||||
.mask_clr = __pgprot(_PAGE_PRESENT | _PAGE_RW)};
|
||||
.mask_clr = __pgprot(_PAGE_PRESENT | _PAGE_RW),
|
||||
.flags = 0};
|
||||
|
||||
return __change_page_attr_set_clr(&cpa, 1);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -66,6 +66,9 @@ int set_memory_rw(unsigned long addr, int numpages);
|
|||
int set_memory_np(unsigned long addr, int numpages);
|
||||
int set_memory_4k(unsigned long addr, int numpages);
|
||||
|
||||
int set_memory_array_uc(unsigned long *addr, int addrinarray);
|
||||
int set_memory_array_wb(unsigned long *addr, int addrinarray);
|
||||
|
||||
/*
|
||||
* For legacy compatibility with the old APIs, a few functions
|
||||
* are provided that work on a "struct page".
|
||||
|
|
|
|||
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Ссылка в новой задаче