Kernel/linux-next
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git synced 2025-01-17 05:45:20 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

coresight: etm4x: Detect access early on the target CPU

Browse Source 
In preparation to detect the support for system instruction
support, move the detection of the device access to the target
CPU.

Link: https://lore.kernel.org/r/20210110224850.1880240-19-suzuki.poulose@arm.com
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210201181351.1475223-21-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2021-02-01 11:13:40 -07:00 committed by Greg Kroah-Hartman
parent e49516e2df
commit fd6e790500
1 changed files with 40 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/hwtracing/coresight/coresight-etm4x-core.c
View File

@ -59,6 +59,11 @@ static u64 etm4_get_access_type(struct etmv4_config *config);
static enum cpuhp_state hp_online;
struct etm4_init_arg {
struct etmv4_drvdata *drvdata;
struct csdev_access *csa;
};
/*
* Check if TRCSSPCICRn(i) is implemented for a given instance.
*
@ -776,6 +781,22 @@ static const struct coresight_ops etm4_cs_ops = {
.source_ops = &etm4_source_ops,
};
static bool etm4_init_iomem_access(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
*csa = CSDEV_ACCESS_IOMEM(drvdata->base);
return true;
}
static bool etm4_init_csdev_access(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
if (drvdata->base)
return etm4_init_iomem_access(drvdata, csa);
return false;
}
static void etm4_init_arch_data(void *info)
{
u32 etmidr0;
@ -784,11 +805,22 @@ static void etm4_init_arch_data(void *info)
u32 etmidr3;
u32 etmidr4;
u32 etmidr5;
struct etmv4_drvdata *drvdata = info;
struct csdev_access tmp_csa = CSDEV_ACCESS_IOMEM(drvdata->base);
struct csdev_access *csa = &tmp_csa;
struct etm4_init_arg *init_arg = info;
struct etmv4_drvdata *drvdata;
struct csdev_access *csa;
int i;
drvdata = init_arg->drvdata;
csa = init_arg->csa;
/*
* If we are unable to detect the access mechanism,
* or unable to detect the trace unit type, fail
* early.
*/
if (!etm4_init_csdev_access(drvdata, csa))
return;
/* Make sure all registers are accessible */
etm4_os_unlock_csa(drvdata, csa);
etm4_cs_unlock(drvdata, csa);
@ -1634,6 +1666,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
struct etmv4_drvdata *drvdata;
struct resource *res = &adev->res;
struct coresight_desc desc = { 0 };
struct etm4_init_arg init_arg = { 0 };
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
@ -1661,7 +1694,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
return PTR_ERR(base);
drvdata->base = base;
desc.access = CSDEV_ACCESS_IOMEM(base);
spin_lock_init(&drvdata->spinlock);
@ -1673,8 +1705,11 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
if (!desc.name)
return -ENOMEM;
init_arg.drvdata = drvdata;
init_arg.csa = &desc.access;
if (smp_call_function_single(drvdata->cpu,
etm4_init_arch_data, drvdata, 1))
etm4_init_arch_data, &init_arg, 1))
dev_err(dev, "ETM arch init failed\n");
if (etm4_arch_supported(drvdata->arch) == false)