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Message-ID: <tip-fe0937b24ff5d7b343b9922201e469f9a6009d9d@git.kernel.org>
Date: Mon, 17 Dec 2018 10:24:48 -0800
From: tip-bot for Peter Zijlstra <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: peterz@...radead.org, dave.hansen@...ux.intel.com,
torvalds@...ux-foundation.org, mingo@...nel.org,
tglx@...utronix.de, luto@...nel.org, riel@...riel.com,
bp@...en8.de, linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:x86/mm] x86/mm/cpa: Fold cpa_flush_range() and
cpa_flush_array() into a single cpa_flush() function
Commit-ID: fe0937b24ff5d7b343b9922201e469f9a6009d9d
Gitweb: https://git.kernel.org/tip/fe0937b24ff5d7b343b9922201e469f9a6009d9d
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Mon, 3 Dec 2018 18:03:51 +0100
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 17 Dec 2018 18:54:28 +0100
x86/mm/cpa: Fold cpa_flush_range() and cpa_flush_array() into a single cpa_flush() function
Note that the cache flush loop in cpa_flush_*() is identical when we
use __cpa_addr(); further observe that flush_tlb_kernel_range() is a
special case of to the cpa_flush_array() TLB invalidation code.
This then means the two functions are virtually identical. Fold these
two functions into a single cpa_flush() call.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...riel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tom.StDenis@....com
Cc: dave.hansen@...el.com
Link: http://lkml.kernel.org/r/20181203171043.559855600@infradead.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
arch/x86/mm/pageattr.c | 92 ++++++++++----------------------------------------
1 file changed, 18 insertions(+), 74 deletions(-)
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 12b69263e501..85ef53b86fa0 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -304,51 +304,7 @@ static void cpa_flush_all(unsigned long cache)
on_each_cpu(__cpa_flush_all, (void *) cache, 1);
}
-static bool __inv_flush_all(int cache)
-{
- BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
-
- if (cache && !static_cpu_has(X86_FEATURE_CLFLUSH)) {
- cpa_flush_all(cache);
- return true;
- }
-
- return false;
-}
-
-static void cpa_flush_range(unsigned long start, int numpages, int cache)
-{
- unsigned int i, level;
- unsigned long addr;
-
- WARN_ON(PAGE_ALIGN(start) != start);
-
- if (__inv_flush_all(cache))
- return;
-
- flush_tlb_kernel_range(start, start + PAGE_SIZE * numpages);
-
- if (!cache)
- return;
-
- /*
- * We only need to flush on one CPU,
- * clflush is a MESI-coherent instruction that
- * will cause all other CPUs to flush the same
- * cachelines:
- */
- for (i = 0, addr = start; i < numpages; i++, addr += PAGE_SIZE) {
- pte_t *pte = lookup_address(addr, &level);
-
- /*
- * Only flush present addresses:
- */
- if (pte && (pte_val(*pte) & _PAGE_PRESENT))
- clflush_cache_range((void *) addr, PAGE_SIZE);
- }
-}
-
-void __cpa_flush_array(void *data)
+void __cpa_flush_tlb(void *data)
{
struct cpa_data *cpa = data;
unsigned int i;
@@ -357,33 +313,31 @@ void __cpa_flush_array(void *data)
__flush_tlb_one_kernel(__cpa_addr(cpa, i));
}
-static void cpa_flush_array(struct cpa_data *cpa, int cache)
+static void cpa_flush(struct cpa_data *data, int cache)
{
+ struct cpa_data *cpa = data;
unsigned int i;
- if (cpa_check_flush_all(cache))
+ BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
+
+ if (cache && !static_cpu_has(X86_FEATURE_CLFLUSH)) {
+ cpa_flush_all(cache);
return;
+ }
if (cpa->numpages <= tlb_single_page_flush_ceiling)
- on_each_cpu(__cpa_flush_array, cpa, 1);
+ on_each_cpu(__cpa_flush_tlb, cpa, 1);
else
flush_tlb_all();
if (!cache)
return;
- /*
- * We only need to flush on one CPU,
- * clflush is a MESI-coherent instruction that
- * will cause all other CPUs to flush the same
- * cachelines:
- */
for (i = 0; i < cpa->numpages; i++) {
unsigned long addr = __cpa_addr(cpa, i);
unsigned int level;
- pte_t *pte;
- pte = lookup_address(addr, &level);
+ pte_t *pte = lookup_address(addr, &level);
/*
* Only flush present addresses:
@@ -1698,7 +1652,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
{
struct cpa_data cpa;
int ret, cache, checkalias;
- unsigned long baddr = 0;
memset(&cpa, 0, sizeof(cpa));
@@ -1732,11 +1685,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
*/
WARN_ON_ONCE(1);
}
- /*
- * Save address for cache flush. *addr is modified in the call
- * to __change_page_attr_set_clr() below.
- */
- baddr = make_addr_canonical_again(*addr);
}
/* Must avoid aliasing mappings in the highmem code */
@@ -1784,11 +1732,7 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
goto out;
}
- if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY))
- cpa_flush_array(&cpa, cache);
- else
- cpa_flush_range(baddr, numpages, cache);
-
+ cpa_flush(&cpa, cache);
out:
return ret;
}
@@ -2097,18 +2041,18 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
/*
* Before changing the encryption attribute, we need to flush caches.
*/
- cpa_flush_range(addr, numpages, 1);
+ cpa_flush(&cpa, 1);
ret = __change_page_attr_set_clr(&cpa, 1);
/*
- * After changing the encryption attribute, we need to flush TLBs
- * again in case any speculative TLB caching occurred (but no need
- * to flush caches again). We could just use cpa_flush_all(), but
- * in case TLB flushing gets optimized in the cpa_flush_range()
- * path use the same logic as above.
+ * After changing the encryption attribute, we need to flush TLBs again
+ * in case any speculative TLB caching occurred (but no need to flush
+ * caches again). We could just use cpa_flush_all(), but in case TLB
+ * flushing gets optimized in the cpa_flush() path use the same logic
+ * as above.
*/
- cpa_flush_range(addr, numpages, 0);
+ cpa_flush(&cpa, 0);
return ret;
}
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