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Date: Wed, 5 Aug 2015 16:49:20 -0700
From: Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To: <daniel.sanders@...tec.com>, <linux-mips@...ux-mips.org>,
<cernekee@...il.com>, <Zubair.Kakakhel@...tec.com>,
<geert+renesas@...der.be>, <david.daney@...ium.com>,
<peterz@...radead.org>, <heiko.carstens@...ibm.com>,
<paul.gortmaker@...driver.com>, <behanw@...verseincode.com>,
<macro@...ux-mips.org>, <cl@...ux.com>, <pkarat@...sta.com>,
<linux@...ck-us.net>, <tkhai@...dex.ru>, <james.hogan@...tec.com>,
<alexinbeijing@...il.com>, <rusty@...tcorp.com.au>,
<Steven.Hill@...tec.com>, <lars.persson@...s.com>,
<aleksey.makarov@...iga.com>, <paul.burton@...tec.com>,
<linux-kernel@...r.kernel.org>, <ralf@...ux-mips.org>,
<luto@...capital.net>, <dahi@...ux.vnet.ibm.com>,
<markos.chandras@...tec.com>, <eunb.song@...sung.com>,
<kumba@...too.org>
Subject: [PATCH v4 1/3] MIPS: mips_flush_cache_range is added
New function mips_flush_cache_range() is added.
It flushes D-cache on kernel VA and I-cache on user VA.
It is significant in case of cache aliasing systems.
It can be used to flush a short sequence of newly written code
to user space and especially usefull in ptrace() and dsemul().
Today a full page is flushed by flush_cache_page in ptrace().
Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
---
arch/mips/include/asm/cacheflush.h | 3 +++
arch/mips/mm/c-octeon.c | 8 +++++++
arch/mips/mm/c-r3k.c | 8 +++++++
arch/mips/mm/c-r4k.c | 43 ++++++++++++++++++++++++++++++++++++
arch/mips/mm/c-tx39.c | 9 ++++++++
arch/mips/mm/cache.c | 4 +++
6 files changed, 75 insertions(+)
diff --git a/arch/mips/include/asm/cacheflush.h b/arch/mips/include/asm/cacheflush.h
index 723229f4cf27..d47bbf129a45 100644
--- a/arch/mips/include/asm/cacheflush.h
+++ b/arch/mips/include/asm/cacheflush.h
@@ -115,6 +115,9 @@ extern void (*flush_cache_sigtramp)(unsigned long addr);
extern void (*flush_icache_all)(void);
extern void (*local_flush_data_cache_page)(void * addr);
extern void (*flush_data_cache_page)(unsigned long addr);
+extern void (*mips_flush_data_cache_range)(struct vm_area_struct *vma,
+ unsigned long vaddr, struct page *page, unsigned long addr,
+ unsigned long size);
/* Run kernel code uncached, useful for cache probing functions. */
unsigned long run_uncached(void *func);
diff --git a/arch/mips/mm/c-octeon.c b/arch/mips/mm/c-octeon.c
index 05b1d7cf9514..38349d177570 100644
--- a/arch/mips/mm/c-octeon.c
+++ b/arch/mips/mm/c-octeon.c
@@ -178,6 +178,13 @@ static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
BUG();
}
+static void octeon_flush_data_cache_range(struct vm_area_struct *vma,
+ unsigned long vaddr, struct page *page, unsigned long addr,
+ unsigned long size)
+{
+ octeon_flush_cache_page(vma, addr, page_to_pfn(page));
+}
+
/**
* Probe Octeon's caches
*
@@ -292,6 +299,7 @@ void octeon_cache_init(void)
flush_cache_sigtramp = octeon_flush_cache_sigtramp;
flush_icache_all = octeon_flush_icache_all;
flush_data_cache_page = octeon_flush_data_cache_page;
+ mips_flush_data_cache_range = octeon_flush_data_cache_range;
flush_icache_range = octeon_flush_icache_range;
local_flush_icache_range = local_octeon_flush_icache_range;
diff --git a/arch/mips/mm/c-r3k.c b/arch/mips/mm/c-r3k.c
index 135ec313c1f6..93b481046619 100644
--- a/arch/mips/mm/c-r3k.c
+++ b/arch/mips/mm/c-r3k.c
@@ -273,6 +273,13 @@ static void r3k_flush_data_cache_page(unsigned long addr)
{
}
+static void r3k_mips_flush_data_cache_range(struct vm_area_struct *vma,
+ unsigned long vaddr, struct page *page, unsigned long addr,
+ unsigned long size)
+{
+ r3k_flush_cache_page(vma, addr, page_to_pfn(page));
+}
+
static void r3k_flush_cache_sigtramp(unsigned long addr)
{
unsigned long flags;
@@ -322,6 +329,7 @@ void r3k_cache_init(void)
__flush_cache_all = r3k___flush_cache_all;
flush_cache_mm = r3k_flush_cache_mm;
flush_cache_range = r3k_flush_cache_range;
+ mips_flush_data_cache_range = r3k_mips_flush_data_cache_range;
flush_cache_page = r3k_flush_cache_page;
flush_icache_range = r3k_flush_icache_range;
local_flush_icache_range = r3k_flush_icache_range;
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 5d3a25e1cfae..164770a5c84c 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -645,6 +645,48 @@ static void r4k_flush_data_cache_page(unsigned long addr)
r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr);
}
+struct mips_flush_data_cache_range_args {
+ struct vm_area_struct *vma;
+ unsigned long vaddr;
+ unsigned long start;
+ unsigned long len;
+};
+
+static inline void local_r4k_mips_flush_data_cache_range(void *args)
+{
+ struct mips_flush_data_cache_range_args *f_args = args;
+ unsigned long vaddr = f_args->vaddr;
+ unsigned long start = f_args->start;
+ unsigned long len = f_args->len;
+ struct vm_area_struct * vma = f_args->vma;
+
+ blast_dcache_range(start, start + len);
+
+ if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) {
+ wmb();
+
+ /* vma is given for exec check only, mmap is current,
+ so - no non-current vma page flush, just user or kernel */
+ protected_blast_icache_range(vaddr, vaddr + len);
+ }
+}
+
+/* flush dirty kernel data and a corresponding user instructions (if needed).
+ used in copy_to_user_page() */
+static void r4k_mips_flush_data_cache_range(struct vm_area_struct *vma,
+ unsigned long vaddr, struct page *page, unsigned long start,
+ unsigned long len)
+{
+ struct mips_flush_data_cache_range_args args;
+
+ args.vma = vma;
+ args.vaddr = vaddr;
+ args.start = start;
+ args.len = len;
+
+ r4k_on_each_cpu(local_r4k_mips_flush_data_cache_range, (void *)&args);
+}
+
struct flush_icache_range_args {
unsigned long start;
unsigned long end;
@@ -1692,6 +1734,7 @@ void r4k_cache_init(void)
flush_icache_all = r4k_flush_icache_all;
local_flush_data_cache_page = local_r4k_flush_data_cache_page;
flush_data_cache_page = r4k_flush_data_cache_page;
+ mips_flush_data_cache_range = r4k_mips_flush_data_cache_range;
flush_icache_range = r4k_flush_icache_range;
local_flush_icache_range = local_r4k_flush_icache_range;
diff --git a/arch/mips/mm/c-tx39.c b/arch/mips/mm/c-tx39.c
index 596e18458e04..3b9369eb01de 100644
--- a/arch/mips/mm/c-tx39.c
+++ b/arch/mips/mm/c-tx39.c
@@ -228,6 +228,13 @@ static void tx39_flush_data_cache_page(unsigned long addr)
tx39_blast_dcache_page(addr);
}
+static void local_flush_data_cache_range(struct vm_area_struct *vma,
+ unsigned long vaddr, struct page *page, unsigned long addr,
+ unsigned long size)
+{
+ flush_cache_page(vma, addr, page_to_pfn(page));
+}
+
static void tx39_flush_icache_range(unsigned long start, unsigned long end)
{
if (end - start > dcache_size)
@@ -369,6 +376,7 @@ void tx39_cache_init(void)
flush_cache_sigtramp = (void *) tx39h_flush_icache_all;
local_flush_data_cache_page = (void *) tx39h_flush_icache_all;
+ mips_flush_data_cache_range = (void *) local_flush_data_cache_range;
flush_data_cache_page = (void *) tx39h_flush_icache_all;
_dma_cache_wback_inv = tx39h_dma_cache_wback_inv;
@@ -398,6 +406,7 @@ void tx39_cache_init(void)
flush_cache_sigtramp = tx39_flush_cache_sigtramp;
local_flush_data_cache_page = local_tx39_flush_data_cache_page;
+ mips_flush_data_cache_range = (void *) local_flush_data_cache_range;
flush_data_cache_page = tx39_flush_data_cache_page;
_dma_cache_wback_inv = tx39_dma_cache_wback_inv;
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index aab218c36e0d..e25500e62e0e 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -44,10 +44,14 @@ void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
void (*flush_cache_sigtramp)(unsigned long addr);
void (*local_flush_data_cache_page)(void * addr);
void (*flush_data_cache_page)(unsigned long addr);
+void (*mips_flush_data_cache_range)(struct vm_area_struct *vma,
+ unsigned long vaddr, struct page *page, unsigned long addr,
+ unsigned long size);
void (*flush_icache_all)(void);
EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
EXPORT_SYMBOL(flush_data_cache_page);
+EXPORT_SYMBOL(mips_flush_data_cache_range);
EXPORT_SYMBOL(flush_icache_all);
#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
--
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