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Two fixes for omap variants for v4.16-rc cycle

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Fix insecure W+X mapping warning for SRAM for omaps that
 don't yet use drivers/misc/*sram*.c code. An earlier attempt
 at fixing this turned out to cause problems with PM on omap3,
 this version works with PM on omap3.
 
 Also fix dmtimer probe for omap16xx devices that was noticed
 with the pending dmtimer move to drivers. It seems this has
 been broken for a while and is a non-critical for booting.
 It is needed for PM on omap16xx though.
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Merge tag 'omap-for-v4.16/sram-fix-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes

Pull "Two fixes for omap variants for v4.16-rc cycle" from Tony Lindgren:

Fix insecure W+X mapping warning for SRAM for omaps that
don't yet use drivers/misc/*sram*.c code. An earlier attempt
at fixing this turned out to cause problems with PM on omap3,
this version works with PM on omap3.

Also fix dmtimer probe for omap16xx devices that was noticed
with the pending dmtimer move to drivers. It seems this has
been broken for a while and is a non-critical for booting.
It is needed for PM on omap16xx though.

* tag 'omap-for-v4.16/sram-fix-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: OMAP: Fix SRAM W+X mapping
  ARM: OMAP: Fix dmtimer init for omap1
This commit is contained in:
Arnd Bergmann 2018-03-27 13:11:21 +02:00
commit 66f3731f39
3 changed files with 38 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm/plat-omap/dmtimer.c
View File

@ -888,11 +888,8 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
timer->irq = irq->start;
timer->pdev = pdev;
/* Skip pm_runtime_enable for OMAP1 */
if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
pm_runtime_enable(dev);
pm_runtime_irq_safe(dev);
}
pm_runtime_enable(dev);
pm_runtime_irq_safe(dev);
if (!timer->reserved) {
ret = pm_runtime_get_sync(dev);

11
arch/arm/plat-omap/include/plat/sram.h
View File

@ -5,13 +5,4 @@ void omap_map_sram(unsigned long start, unsigned long size,
unsigned long skip, int cached);
void omap_sram_reset(void);
extern void *omap_sram_push_address(unsigned long size);
/* Macro to push a function to the internal SRAM, using the fncpy API */
#define omap_sram_push(funcp, size) ({ \
typeof(&(funcp)) _res = NULL; \
void *_sram_address = omap_sram_push_address(size); \
if (_sram_address) \
_res = fncpy(_sram_address, &(funcp), size); \
_res; \
})
extern void *omap_sram_push(void *funcp, unsigned long size);

36
arch/arm/plat-omap/sram.c
View File

@ -23,6 +23,7 @@
#include <asm/fncpy.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/set_memory.h>
#include <asm/mach/map.h>
@ -42,7 +43,7 @@ static void __iomem *omap_sram_ceil;
* Note that fncpy requires the returned address to be aligned
* to an 8-byte boundary.
*/
void *omap_sram_push_address(unsigned long size)
static void *omap_sram_push_address(unsigned long size)
{
unsigned long available, new_ceil = (unsigned long)omap_sram_ceil;
@ -60,6 +61,30 @@ void *omap_sram_push_address(unsigned long size)
return (void *)omap_sram_ceil;
}
void *omap_sram_push(void *funcp, unsigned long size)
{
void *sram;
unsigned long base;
int pages;
void *dst = NULL;
sram = omap_sram_push_address(size);
if (!sram)
return NULL;
base = (unsigned long)sram & PAGE_MASK;
pages = PAGE_ALIGN(size) / PAGE_SIZE;
set_memory_rw(base, pages);
dst = fncpy(sram, funcp, size);
set_memory_ro(base, pages);
set_memory_x(base, pages);
return dst;
}
/*
* The SRAM context is lost during off-idle and stack
* needs to be reset.
@ -75,6 +100,9 @@ void omap_sram_reset(void)
void __init omap_map_sram(unsigned long start, unsigned long size,
unsigned long skip, int cached)
{
unsigned long base;
int pages;
if (size == 0)
return;
@ -95,4 +123,10 @@ void __init omap_map_sram(unsigned long start, unsigned long size,
*/
memset_io(omap_sram_base + omap_sram_skip, 0,
omap_sram_size - omap_sram_skip);
base = (unsigned long)omap_sram_base;
pages = PAGE_ALIGN(omap_sram_size) / PAGE_SIZE;
set_memory_ro(base, pages);
set_memory_x(base, pages);
}