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coresight: catu: Plug in CATU as a backend for ETR buffer

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Now that we can use a CATU with a scatter gather table, add support
for the TMC ETR to make use of the connected CATU in translate mode.
This is done by adding CATU as new buffer mode.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose
2018-07-11 13:40:34 -06:00
committed by Greg Kroah-Hartman
parent 8ed536b1e2
commit 434d611cdd
4 changed files with 174 additions and 11 deletions
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25
drivers/hwtracing/coresight/coresight-tmc-etr.c
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@@ -710,7 +710,7 @@ static const struct etr_buf_operations etr_sg_buf_ops = {
* Returns : coresight_device ptr for the CATU device if a CATU is found.
* : NULL otherwise.
*/
static inline struct coresight_device *
struct coresight_device *
tmc_etr_get_catu_device(struct tmc_drvdata *drvdata)
{
int i;
@@ -733,7 +733,7 @@ static inline void tmc_etr_enable_catu(struct tmc_drvdata *drvdata)
struct coresight_device *catu = tmc_etr_get_catu_device(drvdata);
if (catu && helper_ops(catu)->enable)
helper_ops(catu)->enable(catu, NULL);
helper_ops(catu)->enable(catu, drvdata->etr_buf);
}
static inline void tmc_etr_disable_catu(struct tmc_drvdata *drvdata)
@@ -741,12 +741,13 @@ static inline void tmc_etr_disable_catu(struct tmc_drvdata *drvdata)
struct coresight_device *catu = tmc_etr_get_catu_device(drvdata);
if (catu && helper_ops(catu)->disable)
helper_ops(catu)->disable(catu, NULL);
helper_ops(catu)->disable(catu, drvdata->etr_buf);
}
static const struct etr_buf_operations *etr_buf_ops[] = {
[ETR_MODE_FLAT] = &etr_flat_buf_ops,
[ETR_MODE_ETR_SG] = &etr_sg_buf_ops,
[ETR_MODE_CATU] = &etr_catu_buf_ops,
};
static inline int tmc_etr_mode_alloc_buf(int mode,
@@ -754,12 +755,15 @@ static inline int tmc_etr_mode_alloc_buf(int mode,
struct etr_buf *etr_buf, int node,
void **pages)
{
int rc;
int rc = -EINVAL;
switch (mode) {
case ETR_MODE_FLAT:
case ETR_MODE_ETR_SG:
rc = etr_buf_ops[mode]->alloc(drvdata, etr_buf, node, pages);
case ETR_MODE_CATU:
if (etr_buf_ops[mode]->alloc)
rc = etr_buf_ops[mode]->alloc(drvdata, etr_buf,
node, pages);
if (!rc)
etr_buf->ops = etr_buf_ops[mode];
return rc;
@@ -782,10 +786,14 @@ static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata,
{
int rc = -ENOMEM;
bool has_etr_sg, has_iommu;
bool has_sg, has_catu;
struct etr_buf *etr_buf;
has_etr_sg = tmc_etr_has_cap(drvdata, TMC_ETR_SG);
has_iommu = iommu_get_domain_for_dev(drvdata->dev);
has_catu = !!tmc_etr_get_catu_device(drvdata);
has_sg = has_catu || has_etr_sg;
etr_buf = kzalloc(sizeof(*etr_buf), GFP_KERNEL);
if (!etr_buf)
@@ -806,17 +814,22 @@ static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata,
*
*/
if (!pages &&
(!has_etr_sg || has_iommu || size < SZ_1M))
(!has_sg || has_iommu || size < SZ_1M))
rc = tmc_etr_mode_alloc_buf(ETR_MODE_FLAT, drvdata,
etr_buf, node, pages);
if (rc && has_etr_sg)
rc = tmc_etr_mode_alloc_buf(ETR_MODE_ETR_SG, drvdata,
etr_buf, node, pages);
if (rc && has_catu)
rc = tmc_etr_mode_alloc_buf(ETR_MODE_CATU, drvdata,
etr_buf, node, pages);
if (rc) {
kfree(etr_buf);
return ERR_PTR(rc);
}
dev_dbg(drvdata->dev, "allocated buffer of size %ldKB in mode %d\n",
(unsigned long)size >> 10, etr_buf->mode);
return etr_buf;
}