[PATCH 3/7] firmware: arm_scmi: Generalize FastChannel support
Cristian Marussi
cristian.marussi at arm.com
Wed May 4 02:36:05 PDT 2022
Generalize existing FastChannel support used in Perf protocol and make it
available to possibly any protocol refactoring the common code into a
couple of new scmi_proto_helpers_ops routines.
Make Perf protocol FC use this new infrastructure.
No functional change.
Signed-off-by: Cristian Marussi <cristian.marussi at arm.com>
---
drivers/firmware/arm_scmi/driver.c | 165 ++++++++++++++++++++
drivers/firmware/arm_scmi/perf.c | 215 ++++++--------------------
drivers/firmware/arm_scmi/protocols.h | 22 +++
3 files changed, 231 insertions(+), 171 deletions(-)
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 9e07f2ddc721..37f8b87f150a 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -19,6 +19,7 @@
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/io.h>
+#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/hashtable.h>
@@ -1258,10 +1259,174 @@ static int scmi_iterator_run(void *iter)
return ret;
}
+struct scmi_msg_get_fc_info {
+ __le32 domain;
+ __le32 message_id;
+};
+
+struct scmi_msg_resp_desc_fc {
+ __le32 attr;
+#define SUPPORTS_DOORBELL(x) ((x) & BIT(0))
+#define DOORBELL_REG_WIDTH(x) FIELD_GET(GENMASK(2, 1), (x))
+ __le32 rate_limit;
+ __le32 chan_addr_low;
+ __le32 chan_addr_high;
+ __le32 chan_size;
+ __le32 db_addr_low;
+ __le32 db_addr_high;
+ __le32 db_set_lmask;
+ __le32 db_set_hmask;
+ __le32 db_preserve_lmask;
+ __le32 db_preserve_hmask;
+};
+
+static void
+scmi_common_fastchannel_init(const struct scmi_protocol_handle *ph,
+ u8 describe_id, u32 message_id, u32 valid_size,
+ u32 domain, void __iomem **p_addr,
+ struct scmi_fc_db_info **p_db)
+{
+ int ret;
+ u32 flags;
+ u64 phys_addr;
+ u8 size;
+ void __iomem *addr;
+ struct scmi_xfer *t;
+ struct scmi_fc_db_info *db = NULL;
+ struct scmi_msg_get_fc_info *info;
+ struct scmi_msg_resp_desc_fc *resp;
+ const struct scmi_protocol_instance *pi = ph_to_pi(ph);
+
+ if (!p_addr) {
+ ret = -EINVAL;
+ goto err_out;
+ }
+
+ ret = ph->xops->xfer_get_init(ph, describe_id,
+ sizeof(*info), sizeof(*resp), &t);
+ if (ret)
+ goto err_out;
+
+ info = t->tx.buf;
+ info->domain = cpu_to_le32(domain);
+ info->message_id = cpu_to_le32(message_id);
+
+ /*
+ * Bail out on error leaving fc_info addresses zeroed; this includes
+ * the case in which the requested domain/message_id does NOT support
+ * fastchannels at all.
+ */
+ ret = ph->xops->do_xfer(ph, t);
+ if (ret)
+ goto err_xfer;
+
+ resp = t->rx.buf;
+ flags = le32_to_cpu(resp->attr);
+ size = le32_to_cpu(resp->chan_size);
+ if (size != valid_size) {
+ ret = -EINVAL;
+ goto err_xfer;
+ }
+
+ phys_addr = le32_to_cpu(resp->chan_addr_low);
+ phys_addr |= (u64)le32_to_cpu(resp->chan_addr_high) << 32;
+ addr = devm_ioremap(ph->dev, phys_addr, size);
+ if (!addr) {
+ ret = -EADDRNOTAVAIL;
+ goto err_xfer;
+ }
+
+ *p_addr = addr;
+
+ if (p_db && SUPPORTS_DOORBELL(flags)) {
+ db = devm_kzalloc(ph->dev, sizeof(*db), GFP_KERNEL);
+ if (!db) {
+ ret = -ENOMEM;
+ goto err_db;
+ }
+
+ size = 1 << DOORBELL_REG_WIDTH(flags);
+ phys_addr = le32_to_cpu(resp->db_addr_low);
+ phys_addr |= (u64)le32_to_cpu(resp->db_addr_high) << 32;
+ addr = devm_ioremap(ph->dev, phys_addr, size);
+ if (!addr) {
+ ret = -EADDRNOTAVAIL;
+ goto err_db_mem;
+ }
+
+ db->addr = addr;
+ db->width = size;
+ db->set = le32_to_cpu(resp->db_set_lmask);
+ db->set |= (u64)le32_to_cpu(resp->db_set_hmask) << 32;
+ db->mask = le32_to_cpu(resp->db_preserve_lmask);
+ db->mask |= (u64)le32_to_cpu(resp->db_preserve_hmask) << 32;
+
+ *p_db = db;
+ }
+
+ ph->xops->xfer_put(ph, t);
+
+ dev_dbg(ph->dev,
+ "Using valid FC for protocol %X [MSG_ID:%u / RES_ID:%u]\n",
+ pi->proto->id, message_id, domain);
+
+ return;
+
+err_db_mem:
+ devm_kfree(ph->dev, db);
+
+err_db:
+ *p_addr = NULL;
+
+err_xfer:
+ ph->xops->xfer_put(ph, t);
+
+err_out:
+ dev_warn(ph->dev,
+ "Failed to get FC for protocol %X [MSG_ID:%u / RES_ID:%u] - ret:%d. Using regular messaging.\n",
+ pi->proto->id, message_id, domain, ret);
+}
+
+#define SCMI_PROTO_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_common_fastchannel_db_ring(struct scmi_fc_db_info *db)
+{
+ if (!db || !db->addr)
+ return;
+
+ if (db->width == 1)
+ SCMI_PROTO_FC_RING_DB(8);
+ else if (db->width == 2)
+ SCMI_PROTO_FC_RING_DB(16);
+ else if (db->width == 4)
+ SCMI_PROTO_FC_RING_DB(32);
+ else /* db->width == 8 */
+#ifdef CONFIG_64BIT
+ SCMI_PROTO_FC_RING_DB(64);
+#else
+ {
+ u64 val = 0;
+
+ if (db->mask)
+ val = ioread64_hi_lo(db->addr) & db->mask;
+ iowrite64_hi_lo(db->set | val, db->addr);
+ }
+#endif
+}
+
static const struct scmi_proto_helpers_ops helpers_ops = {
.extended_name_get = scmi_common_extended_name_get,
.iter_response_init = scmi_iterator_init,
.iter_response_run = scmi_iterator_run,
+ .fastchannel_init = scmi_common_fastchannel_init,
+ .fastchannel_db_ring = scmi_common_fastchannel_db_ring,
};
/**
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 8f4051aca220..da7fe3561217 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -10,7 +10,6 @@
#include <linux/bits.h>
#include <linux/of.h>
#include <linux/io.h>
-#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
@@ -35,6 +34,12 @@ enum scmi_performance_protocol_cmd {
PERF_DOMAIN_NAME_GET = 0xc,
};
+enum {
+ PERF_FC_LEVEL,
+ PERF_FC_LIMIT,
+ PERF_FC_MAX,
+};
+
struct scmi_opp {
u32 perf;
u32 power;
@@ -115,43 +120,6 @@ struct scmi_msg_resp_perf_describe_levels {
} opp[];
};
-struct scmi_perf_get_fc_info {
- __le32 domain;
- __le32 message_id;
-};
-
-struct scmi_msg_resp_perf_desc_fc {
- __le32 attr;
-#define SUPPORTS_DOORBELL(x) ((x) & BIT(0))
-#define DOORBELL_REG_WIDTH(x) FIELD_GET(GENMASK(2, 1), (x))
- __le32 rate_limit;
- __le32 chan_addr_low;
- __le32 chan_addr_high;
- __le32 chan_size;
- __le32 db_addr_low;
- __le32 db_addr_high;
- __le32 db_set_lmask;
- __le32 db_set_hmask;
- __le32 db_preserve_lmask;
- __le32 db_preserve_hmask;
-};
-
-struct scmi_fc_db_info {
- int width;
- u64 set;
- u64 mask;
- void __iomem *addr;
-};
-
-struct scmi_fc_info {
- void __iomem *level_set_addr;
- void __iomem *limit_set_addr;
- void __iomem *level_get_addr;
- void __iomem *limit_get_addr;
- struct scmi_fc_db_info *level_set_db;
- struct scmi_fc_db_info *limit_set_db;
-};
-
struct perf_dom_info {
bool set_limits;
bool set_perf;
@@ -360,40 +328,6 @@ scmi_perf_describe_levels_get(const struct scmi_protocol_handle *ph, u32 domain,
return ret;
}
-#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 | val, db->addr);
- }
-#endif
-}
-
static int scmi_perf_mb_limits_set(const struct scmi_protocol_handle *ph,
u32 domain, u32 max_perf, u32 min_perf)
{
@@ -426,10 +360,12 @@ static int scmi_perf_limits_set(const struct scmi_protocol_handle *ph,
if (PROTOCOL_REV_MAJOR(pi->version) >= 0x3 && !max_perf && !min_perf)
return -EINVAL;
- 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);
+ if (dom->fc_info && dom->fc_info[PERF_FC_LIMIT].set_addr) {
+ struct scmi_fc_info *fci = &dom->fc_info[PERF_FC_LIMIT];
+
+ iowrite32(max_perf, fci->set_addr);
+ iowrite32(min_perf, fci->set_addr + 4);
+ ph->hops->fastchannel_db_ring(fci->set_db);
return 0;
}
@@ -468,9 +404,11 @@ static int scmi_perf_limits_get(const struct scmi_protocol_handle *ph,
struct scmi_perf_info *pi = ph->get_priv(ph);
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);
+ if (dom->fc_info && dom->fc_info[PERF_FC_LIMIT].get_addr) {
+ struct scmi_fc_info *fci = &dom->fc_info[PERF_FC_LIMIT];
+
+ *max_perf = ioread32(fci->get_addr);
+ *min_perf = ioread32(fci->get_addr + 4);
return 0;
}
@@ -505,9 +443,11 @@ static int scmi_perf_level_set(const struct scmi_protocol_handle *ph,
struct scmi_perf_info *pi = ph->get_priv(ph);
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);
+ if (dom->fc_info && dom->fc_info[PERF_FC_LEVEL].set_addr) {
+ struct scmi_fc_info *fci = &dom->fc_info[PERF_FC_LEVEL];
+
+ iowrite32(level, fci->set_addr);
+ ph->hops->fastchannel_db_ring(fci->set_db);
return 0;
}
@@ -542,8 +482,8 @@ static int scmi_perf_level_get(const struct scmi_protocol_handle *ph,
struct scmi_perf_info *pi = ph->get_priv(ph);
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);
+ if (dom->fc_info && dom->fc_info[PERF_FC_LEVEL].get_addr) {
+ *level = ioread32(dom->fc_info[PERF_FC_LEVEL].get_addr);
return 0;
}
@@ -572,100 +512,33 @@ static int scmi_perf_level_limits_notify(const struct scmi_protocol_handle *ph,
return ret;
}
-static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
-{
- if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)
- return true;
- if ((msg == PERF_LIMITS_GET || msg == PERF_LIMITS_SET) && size == 8)
- return true;
- return false;
-}
-
-static void
-scmi_perf_domain_desc_fc(const struct scmi_protocol_handle *ph, u32 domain,
- u32 message_id, void __iomem **p_addr,
- struct scmi_fc_db_info **p_db)
-{
- int ret;
- u32 flags;
- u64 phys_addr;
- u8 size;
- void __iomem *addr;
- struct scmi_xfer *t;
- struct scmi_fc_db_info *db;
- struct scmi_perf_get_fc_info *info;
- struct scmi_msg_resp_perf_desc_fc *resp;
-
- if (!p_addr)
- return;
-
- ret = ph->xops->xfer_get_init(ph, PERF_DESCRIBE_FASTCHANNEL,
- sizeof(*info), sizeof(*resp), &t);
- if (ret)
- return;
-
- info = t->tx.buf;
- info->domain = cpu_to_le32(domain);
- info->message_id = cpu_to_le32(message_id);
-
- ret = ph->xops->do_xfer(ph, t);
- if (ret)
- goto err_xfer;
-
- resp = t->rx.buf;
- flags = le32_to_cpu(resp->attr);
- size = le32_to_cpu(resp->chan_size);
- if (!scmi_perf_fc_size_is_valid(message_id, size))
- goto err_xfer;
-
- phys_addr = le32_to_cpu(resp->chan_addr_low);
- phys_addr |= (u64)le32_to_cpu(resp->chan_addr_high) << 32;
- addr = devm_ioremap(ph->dev, phys_addr, size);
- if (!addr)
- goto err_xfer;
- *p_addr = addr;
-
- if (p_db && SUPPORTS_DOORBELL(flags)) {
- db = devm_kzalloc(ph->dev, sizeof(*db), GFP_KERNEL);
- if (!db)
- goto err_xfer;
-
- size = 1 << DOORBELL_REG_WIDTH(flags);
- phys_addr = le32_to_cpu(resp->db_addr_low);
- phys_addr |= (u64)le32_to_cpu(resp->db_addr_high) << 32;
- addr = devm_ioremap(ph->dev, phys_addr, size);
- if (!addr)
- goto err_xfer;
-
- db->addr = addr;
- db->width = size;
- db->set = le32_to_cpu(resp->db_set_lmask);
- db->set |= (u64)le32_to_cpu(resp->db_set_hmask) << 32;
- db->mask = le32_to_cpu(resp->db_preserve_lmask);
- db->mask |= (u64)le32_to_cpu(resp->db_preserve_hmask) << 32;
- *p_db = db;
- }
-err_xfer:
- ph->xops->xfer_put(ph, t);
-}
-
static void scmi_perf_domain_init_fc(const struct scmi_protocol_handle *ph,
u32 domain, struct scmi_fc_info **p_fc)
{
struct scmi_fc_info *fc;
- fc = devm_kzalloc(ph->dev, sizeof(*fc), GFP_KERNEL);
+ fc = devm_kcalloc(ph->dev, PERF_FC_MAX, sizeof(*fc), GFP_KERNEL);
if (!fc)
return;
- scmi_perf_domain_desc_fc(ph, domain, PERF_LEVEL_SET,
- &fc->level_set_addr, &fc->level_set_db);
- scmi_perf_domain_desc_fc(ph, domain, PERF_LEVEL_GET,
- &fc->level_get_addr, NULL);
- scmi_perf_domain_desc_fc(ph, domain, PERF_LIMITS_SET,
- &fc->limit_set_addr, &fc->limit_set_db);
- scmi_perf_domain_desc_fc(ph, domain, PERF_LIMITS_GET,
- &fc->limit_get_addr, NULL);
+ ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
+ PERF_LEVEL_SET, 4, domain,
+ &fc[PERF_FC_LEVEL].set_addr,
+ &fc[PERF_FC_LEVEL].set_db);
+
+ ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
+ PERF_LEVEL_GET, 4, domain,
+ &fc[PERF_FC_LEVEL].get_addr, NULL);
+
+ ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
+ PERF_LIMITS_SET, 8, domain,
+ &fc[PERF_FC_LIMIT].set_addr,
+ &fc[PERF_FC_LIMIT].set_db);
+
+ ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
+ PERF_LIMITS_GET, 8, domain,
+ &fc[PERF_FC_LIMIT].get_addr, NULL);
+
*p_fc = fc;
}
@@ -789,7 +662,7 @@ static bool scmi_fast_switch_possible(const struct scmi_protocol_handle *ph,
dom = pi->dom_info + scmi_dev_domain_id(dev);
- return dom->fc_info && dom->fc_info->level_set_addr;
+ return dom->fc_info && dom->fc_info[PERF_FC_LEVEL].set_addr;
}
static bool scmi_power_scale_mw_get(const struct scmi_protocol_handle *ph)
diff --git a/drivers/firmware/arm_scmi/protocols.h b/drivers/firmware/arm_scmi/protocols.h
index c774e37062e9..13dbecbc032b 100644
--- a/drivers/firmware/arm_scmi/protocols.h
+++ b/drivers/firmware/arm_scmi/protocols.h
@@ -214,6 +214,19 @@ struct scmi_iterator_ops {
struct scmi_iterator_state *st, void *priv);
};
+struct scmi_fc_db_info {
+ int width;
+ u64 set;
+ u64 mask;
+ void __iomem *addr;
+};
+
+struct scmi_fc_info {
+ void __iomem *set_addr;
+ void __iomem *get_addr;
+ struct scmi_fc_db_info *set_db;
+};
+
/**
* struct scmi_proto_helpers_ops - References to common protocol helpers
* @extended_name_get: A common helper function to retrieve extended naming
@@ -229,6 +242,9 @@ struct scmi_iterator_ops {
* provided in @ops.
* @iter_response_run: A common helper to trigger the run of a previously
* initialized iterator.
+ * @fastchannel_init: A common helper used to initialize FC descriptors by
+ * gathering FC descriptions from the SCMI platform server.
+ * @fastchannel_db_ring: A common helper to ring a FC doorbell.
*/
struct scmi_proto_helpers_ops {
int (*extended_name_get)(const struct scmi_protocol_handle *ph,
@@ -238,6 +254,12 @@ struct scmi_proto_helpers_ops {
unsigned int max_resources, u8 msg_id,
size_t tx_size, void *priv);
int (*iter_response_run)(void *iter);
+ void (*fastchannel_init)(const struct scmi_protocol_handle *ph,
+ u8 describe_id, u32 message_id,
+ u32 valid_size, u32 domain,
+ void __iomem **p_addr,
+ struct scmi_fc_db_info **p_db);
+ void (*fastchannel_db_ring)(struct scmi_fc_db_info *db);
};
/**
--
2.32.0
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