mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

firmware: arm_scmi: Make use SCMI v2.0 fastchannel for performance protocol 

SCMI v2.0 adds support for "FastChannel" which do not use a message
header as they are specialized for a single message.

Only PERFORMANCE_LIMITS_{SET,GET} and PERFORMANCE_LEVEL_{SET,GET}
commands are supported over fastchannels. As they are optional, they
need to be discovered by PERFORMANCE_DESCRIBE_FASTCHANNEL command.
Further {LIMIT,LEVEL}_SET commands can have optional doorbell support.

Add support for making use of these fastchannels.

Cc: Ionela Voinescu <Ionela.Voinescu@arm.com>
Cc: Chris Redpath <Chris.Redpath@arm.com>
Cc: Quentin Perret <Quentin.Perret@arm.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2019-07-08 09:41:17 +01:00
parent ac8aaf348c
commit 823839571d
1 changed files with 99 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

103
drivers/firmware/arm_scmi/perf.c
View File

@ -8,6 +8,7 @@
#include <linux/bits.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/sort.h>
@ -293,7 +294,41 @@ scmi_perf_describe_levels_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
#define SCMI_PERF_FC_RING_DB(w) \
do { \
u##w val = 0; \
\
if (db->mask) \
val = ioread##w(db->addr) & db->mask; \
iowrite##w((u##w)db->set | val, db->addr); \
} while (0)
static void scmi_perf_fc_ring_db(struct scmi_fc_db_info *db)
{
if (!db || !db->addr)
return;
if (db->width == 1)
SCMI_PERF_FC_RING_DB(8);
else if (db->width == 2)
SCMI_PERF_FC_RING_DB(16);
else if (db->width == 4)
SCMI_PERF_FC_RING_DB(32);
else /* db->width == 8 */
#ifdef CONFIG_64BIT
SCMI_PERF_FC_RING_DB(64);
#else
{
u64 val = 0;
if (db->mask)
val = ioread64_hi_lo(db->addr) & db->mask;
iowrite64_hi_lo(db->set, db->addr);
}
#endif
}
static int scmi_perf_mb_limits_set(const struct scmi_handle *handle, u32 domain,
u32 max_perf, u32 min_perf)
{
int ret;
@ -316,7 +351,23 @@ static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
u32 max_perf, u32 min_perf)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->limit_set_addr) {
iowrite32(max_perf, dom->fc_info->limit_set_addr);
iowrite32(min_perf, dom->fc_info->limit_set_addr + 4);
scmi_perf_fc_ring_db(dom->fc_info->limit_set_db);
return 0;
}
return scmi_perf_mb_limits_set(handle, domain, max_perf, min_perf);
}
static int scmi_perf_mb_limits_get(const struct scmi_handle *handle, u32 domain,
u32 *max_perf, u32 *min_perf)
{
int ret;
@ -342,7 +393,22 @@ static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
u32 *max_perf, u32 *min_perf)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->limit_get_addr) {
*max_perf = ioread32(dom->fc_info->limit_get_addr);
*min_perf = ioread32(dom->fc_info->limit_get_addr + 4);
return 0;
}
return scmi_perf_mb_limits_get(handle, domain, max_perf, min_perf);
}
static int scmi_perf_mb_level_set(const struct scmi_handle *handle, u32 domain,
u32 level, bool poll)
{
int ret;
@ -365,7 +431,22 @@ static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
u32 level, bool poll)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->level_set_addr) {
iowrite32(level, dom->fc_info->level_set_addr);
scmi_perf_fc_ring_db(dom->fc_info->level_set_db);
return 0;
}
return scmi_perf_mb_level_set(handle, domain, level, poll);
}
static int scmi_perf_mb_level_get(const struct scmi_handle *handle, u32 domain,
u32 *level, bool poll)
{
int ret;
@ -387,6 +468,20 @@ static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
u32 *level, bool poll)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->level_get_addr) {
*level = ioread32(dom->fc_info->level_get_addr);
return 0;
}
return scmi_perf_mb_level_get(handle, domain, level, poll);
}
static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
{
if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)