RPMh LPM stats are quite extensive, but we can extract even more data by
poking the AOSS QMP. This series adds DDR stats using this approach,
setting it up on 8280 as an example.
Signed-off-by: Konrad Dybcio <[email protected]>
---
Konrad Dybcio (3):
dt-bindings: soc: qcom: stats: Add QMP handle
soc: qcom: stats: Add DDR sleep stats
arm64: dts: qcom: sc8280xp: Add QMP handle to RPMh stats
.../devicetree/bindings/soc/qcom/qcom-stats.yaml | 14 ++
arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 1 +
drivers/soc/qcom/qcom_stats.c | 186 ++++++++++++++++++++-
3 files changed, 200 insertions(+), 1 deletion(-)
---
base-commit: 1f5c003694fab4b1ba6cbdcc417488b975c088d0
change-id: 20231130-topic-ddr_sleep_stats-d968e2e28083
Best regards,
--
Konrad Dybcio <[email protected]>
Add DDR sleep stats that include:
- the available RAM low power states
- per-state residency information
- per-frequency residency information (for some freqs only, it seems)
- DDR vote information (AB/IB)
and some magic thing that we're yet to decode.
Based on the msm-5.4 downstream implementation, debugged with some help
from Qualcomm's Maulik Shah.
Signed-off-by: Konrad Dybcio <[email protected]>
---
drivers/soc/qcom/qcom_stats.c | 186 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 185 insertions(+), 1 deletion(-)
diff --git a/drivers/soc/qcom/qcom_stats.c b/drivers/soc/qcom/qcom_stats.c
index 0216fc24f2ca..94ee543d2e8e 100644
--- a/drivers/soc/qcom/qcom_stats.c
+++ b/drivers/soc/qcom/qcom_stats.c
@@ -11,6 +11,7 @@
#include <linux/platform_device.h>
#include <linux/seq_file.h>
+#include <linux/soc/qcom/qcom_aoss.h>
#include <linux/soc/qcom/smem.h>
#include <clocksource/arm_arch_timer.h>
@@ -22,8 +23,20 @@
#define LAST_ENTERED_AT_OFFSET 0x8
#define LAST_EXITED_AT_OFFSET 0x10
#define ACCUMULATED_OFFSET 0x18
+#define DDR_DYNAMIC_OFFSET 0x1c
+ #define DDR_OFFSET_MASK GENMASK(9, 0)
#define CLIENT_VOTES_OFFSET 0x20
+#define ARCH_TIMER_FREQ 19200000
+#define DDR_MAGIC_KEY1 0xA1157A75 /* leetspeak "ALLSTATS" */
+#define DDR_MAX_NUM_ENTRIES 20
+
+#define DDR_VOTE_DRV_MAX 18
+#define DDR_VOTE_DRV_ABSENT 0xdeaddead
+#define DDR_VOTE_DRV_INVALID 0xffffdead
+#define DDR_VOTE_X GENMASK(27, 14)
+#define DDR_VOTE_Y GENMASK(13, 0)
+
struct subsystem_data {
const char *name;
u32 smem_item;
@@ -48,6 +61,7 @@ struct stats_config {
bool appended_stats_avail;
bool dynamic_offset;
bool subsystem_stats_in_smem;
+ bool ddr_stats;
};
struct stats_data {
@@ -68,6 +82,25 @@ struct appended_stats {
u32 reserved[3];
};
+struct ddr_stats_entry {
+ u32 name;
+ u32 count;
+ u64 dur;
+} __packed;
+
+struct ddr_stats {
+ u32 key;
+ u32 entry_count;
+#define MAX_DDR_STAT_ENTRIES 20
+ struct ddr_stats_entry entry[MAX_DDR_STAT_ENTRIES];
+} __packed;
+
+struct ddr_stats_data {
+ struct device *dev;
+ void __iomem *base;
+ struct qmp *qmp;
+};
+
static void qcom_print_stats(struct seq_file *s, const struct sleep_stats *stat)
{
u64 accumulated = stat->accumulated;
@@ -118,6 +151,108 @@ static int qcom_soc_sleep_stats_show(struct seq_file *s, void *unused)
return 0;
}
+#define DDR_NAME_TYPE GENMASK(15, 8)
+ #define DDR_NAME_TYPE_LPM 0
+ #define DDR_NAME_TYPE_FREQ 1
+
+#define DDR_NAME_LPM_NAME GENMASK(7, 0)
+
+#define DDR_NAME_FREQ_MHZ GENMASK(31, 16)
+#define DDR_NAME_FREQ_CP_IDX GENMASK(4, 0)
+static void qcom_ddr_stats_print(struct seq_file *s, struct ddr_stats_entry *entry)
+{
+ u32 cp_idx, name;
+ u8 type;
+
+ type = FIELD_GET(DDR_NAME_TYPE, entry->name);
+
+ switch (type) {
+ case DDR_NAME_TYPE_LPM:
+ name = FIELD_GET(DDR_NAME_LPM_NAME, entry->name);
+
+ seq_printf(s, "LPM | Type 0x%2x\tcount: %u\ttime: %llums\n",
+ name, entry->count, entry->dur);
+ break;
+ case DDR_NAME_TYPE_FREQ:
+ cp_idx = FIELD_GET(DDR_NAME_FREQ_CP_IDX, entry->name);
+ name = FIELD_GET(DDR_NAME_FREQ_MHZ, entry->name);
+
+ /* Neither 0Mhz nor 0 votes is very interesting */
+ if (!name || !entry->count)
+ return;
+
+ seq_printf(s, "Freq | %dMHz (idx %u)\tcount: %u\ttime: %llums\n",
+ name, cp_idx, entry->count, entry->dur);
+ break;
+ default:
+ seq_printf(s, "Unknown data chunk (type = 0x%x count = 0x%x dur = 0x%llx)\n",
+ type, entry->count, entry->dur);
+ }
+}
+
+static int qcom_ddr_stats_show(struct seq_file *s, void *unused)
+{
+ struct ddr_stats_data *ddrd = s->private;
+ struct ddr_stats ddr;
+ struct ddr_stats_entry *entry = ddr.entry;
+ u32 entry_count, stats_size;
+ u32 votes[DDR_VOTE_DRV_MAX];
+ int i, ret;
+
+ /* Request a stats sync, it may take some time to update though.. */
+ ret = qmp_send(ddrd->qmp, "{class: ddr, action: freqsync}");
+ if (ret) {
+ dev_err(ddrd->dev, "failed to send QMP message\n");
+ return ret;
+ }
+
+ entry_count = readl(ddrd->base + offsetof(struct ddr_stats, entry_count));
+ if (entry_count > DDR_MAX_NUM_ENTRIES)
+ return -EINVAL;
+
+ /* We're not guaranteed to have DDR_MAX_NUM_ENTRIES */
+ stats_size = sizeof(ddr);
+ stats_size -= DDR_MAX_NUM_ENTRIES * sizeof(*entry);
+ stats_size += entry_count * sizeof(*entry);
+
+ /* Copy and process the stats */
+ memcpy_fromio(&ddr, ddrd->base, stats_size);
+
+ for (i = 0; i < ddr.entry_count; i++) {
+ /* Convert the period to ms */
+ entry[i].dur = mult_frac(MSEC_PER_SEC, entry[i].dur, ARCH_TIMER_FREQ);
+ }
+
+ for (i = 0; i < ddr.entry_count; i++)
+ qcom_ddr_stats_print(s, &entry[i]);
+
+ /* Ask AOSS to dump DDR votes */
+ ret = qmp_send(ddrd->qmp, "{class: ddr, res: drvs_ddr_votes}");
+ if (ret) {
+ dev_err(ddrd->dev, "failed to send QMP message\n");
+ return ret;
+ }
+
+ /* Subsystem votes */
+ memcpy_fromio(votes, ddrd->base + stats_size, sizeof(u32) * DDR_VOTE_DRV_MAX);
+
+ for (i = 0; i < DDR_VOTE_DRV_MAX; i++) {
+ u32 ab, ib;
+
+ if (votes[i] == DDR_VOTE_DRV_ABSENT || votes[i] == DDR_VOTE_DRV_INVALID)
+ ab = ib = votes[i];
+ else {
+ ab = FIELD_GET(DDR_VOTE_X, votes[i]);
+ ib = FIELD_GET(DDR_VOTE_Y, votes[i]);
+ }
+
+ seq_printf(s, "Vote | AB = %5u\tIB = %5u\n", ab, ib);
+ }
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(qcom_ddr_stats);
DEFINE_SHOW_ATTRIBUTE(qcom_soc_sleep_stats);
DEFINE_SHOW_ATTRIBUTE(qcom_subsystem_sleep_stats);
@@ -180,13 +315,56 @@ static void qcom_create_subsystem_stat_files(struct dentry *root,
&qcom_subsystem_sleep_stats_fops);
}
+static int qcom_create_ddr_stats_files(struct device *dev,
+ struct dentry *root,
+ void __iomem *reg,
+ const struct stats_config *config)
+{
+ struct ddr_stats_data *ddrd;
+ u32 key, stats_offset;
+ struct dentry *dent;
+
+ /* Nothing to do */
+ if (!config->ddr_stats)
+ return 0;
+
+ ddrd = devm_kzalloc(dev, sizeof(*ddrd), GFP_KERNEL);
+ if (!ddrd)
+ return dev_err_probe(dev, -ENOMEM, "Couldn't allocate DDR stats data\n");
+
+ ddrd->dev = dev;
+
+ /* Get the offset of DDR stats */
+ stats_offset = readl(reg + DDR_DYNAMIC_OFFSET) & DDR_OFFSET_MASK;
+ ddrd->base = reg + stats_offset;
+
+ /* Check if DDR stats are present */
+ key = readl(ddrd->base);
+ if (key != DDR_MAGIC_KEY1)
+ return 0;
+
+ dent = debugfs_create_file("ddr_sleep_stats", 0400, root, ddrd, &qcom_ddr_stats_fops);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+
+ /* QMP is only necessary for DDR votes */
+ ddrd->qmp = qmp_get(dev);
+ if (IS_ERR(ddrd->qmp)) {
+ dev_err(dev, "Couldn't get QMP mailbox: %ld. DDR votes won't be available.\n",
+ PTR_ERR(ddrd->qmp));
+ debugfs_remove(dent);
+ }
+
+ return 0;
+}
+
static int qcom_stats_probe(struct platform_device *pdev)
{
void __iomem *reg;
struct dentry *root;
const struct stats_config *config;
struct stats_data *d;
- int i;
+ int i, ret;
config = device_get_match_data(&pdev->dev);
if (!config)
@@ -208,6 +386,11 @@ static int qcom_stats_probe(struct platform_device *pdev)
qcom_create_subsystem_stat_files(root, config);
qcom_create_soc_sleep_stat_files(root, reg, d, config);
+ ret = qcom_create_ddr_stats_files(&pdev->dev, root, reg, config);
+ if (ret) {
+ debugfs_remove_recursive(root);
+ return ret;
+ };
platform_set_drvdata(pdev, root);
@@ -254,6 +437,7 @@ static const struct stats_config rpmh_data = {
.appended_stats_avail = false,
.dynamic_offset = false,
.subsystem_stats_in_smem = true,
+ .ddr_stats = true,
};
static const struct of_device_id qcom_stats_table[] = {
--
2.43.0
On Thu, 30 Nov 2023 15:58:20 +0100, Konrad Dybcio wrote:
> RPMh LPM stats are quite extensive, but we can extract even more data by
> poking the AOSS QMP. This series adds DDR stats using this approach,
> setting it up on 8280 as an example.
>
>
Applied, thanks!
[3/3] arm64: dts: qcom: sc8280xp: Add QMP handle to RPMh stats
commit: bcaa71f13cc7160f2d5f9a401e9c58215612f79e
Best regards,
--
Bjorn Andersson <[email protected]>