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coresight: add dsb sy barrier to stm data writes 

Add dsb sy barrier to stm data writes to avoid getting into a
situation where many writes are outstanding due to stm logging.
This helps avoid a cpu errata condition that gets triggerred with
heavy stm logging.

Change-Id: I7664fa3ccfcd8ac05514eb5e4db9441db9d809a2
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
This commit is contained in:
Pratik Patel 2014-11-04 16:36:36 -08:00
parent f1a9f6d4cc
commit 52c3a5df57
2 changed files with 30 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/devicetree/bindings/coresight/coresight.txt
View File

@ -143,6 +143,7 @@ Optional properties:
- qcom,round-robin : indicates if per core etms are allowed round-robin access
by the funnel
- qcom,write-64bit : only 64bit data writes supported by stm
- qcom,data-barrier : barrier required for every stm data write to channel space
- <supply-name>-supply: phandle to the regulator device tree node. The required
<supply-name> is "vdd" for SD card and "vdd-io" for SD
I/O supply. Used for tpiu component

34
drivers/coresight/coresight-stm.c
View File

@ -36,10 +36,6 @@
#define stm_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
#define stm_readl(drvdata, off) __raw_readl(drvdata->base + off)
#define stm_data_writeb(val, addr) __raw_writeb_no_log(val, addr)
#define stm_data_writew(val, addr) __raw_writew_no_log(val, addr)
#define stm_data_writel(val, addr) __raw_writel_no_log(val, addr)
#define STM_LOCK(drvdata) \
do { \
mb(); \
@ -141,10 +137,35 @@ struct stm_drvdata {
bool enable;
DECLARE_BITMAP(entities, OST_ENTITY_MAX);
bool write_64bit;
bool data_barrier;
};
static struct stm_drvdata *stmdrvdata;
static inline void stm_data_writeb(uint8_t val, void *addr)
{
__raw_writeb_no_log(val, addr);
if (stmdrvdata->data_barrier)
/* Helps avoid large number of outstanding writes */
mb();
}
static inline void stm_data_writew(uint16_t val, void *addr)
{
__raw_writew_no_log(val, addr);
if (stmdrvdata->data_barrier)
/* Helps avoid large number of outstanding writes */
mb();
}
static inline void stm_data_writel(uint32_t val, void *addr)
{
__raw_writel_no_log(val, addr);
if (stmdrvdata->data_barrier)
/* Helps avoid large number of outstanding writes */
mb();
}
static int stm_hwevent_isenable(struct stm_drvdata *drvdata)
{
int ret = 0;
@ -868,9 +889,12 @@ static int stm_probe(struct platform_device *pdev)
bitmap_fill(drvdata->entities, OST_ENTITY_MAX);
if (pdev->dev.of_node)
if (pdev->dev.of_node) {
drvdata->write_64bit = of_property_read_bool(pdev->dev.of_node,
"qcom,write-64bit");
drvdata->data_barrier = of_property_read_bool(pdev->dev.of_node,
"qcom,data-barrier");
}
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)