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Date: Thu, 8 Jul 2021 23:21:15 +0000
From: Stephen Boyd <swboyd@...omium.org>
To: Andy Gross <agross@...nel.org>, Georgi Djakov <djakov@...nel.org>,
Odelu Kukatla <okukatla@...eaurora.org>,
bjorn.andersson@...aro.org, evgreen@...gle.com,
georgi.djakov@...aro.org, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc: seansw@....qualcomm.com, elder@...aro.org,
linux-arm-msm-owner@...r.kernel.org
Subject: Re: [V4 2/3] interconnect: qcom: Add EPSS L3 support on SC7280
Quoting Odelu Kukatla (2021-06-18 04:28:53)
> diff --git a/drivers/interconnect/qcom/osm-l3.c b/drivers/interconnect/qcom/osm-l3.c
> index 695f287..a8c0ee8 100644
> --- a/drivers/interconnect/qcom/osm-l3.c
> +++ b/drivers/interconnect/qcom/osm-l3.c
> @@ -15,6 +15,7 @@
> #include <dt-bindings/interconnect/qcom,osm-l3.h>
>
> #include "sc7180.h"
> +#include "sc7280.h"
> #include "sdm845.h"
> #include "sm8150.h"
> #include "sm8250.h"
> @@ -32,17 +33,33 @@
>
> /* EPSS Register offsets */
> #define EPSS_LUT_ROW_SIZE 4
> +#define EPSS_REG_L3_VOTE 0x90
> #define EPSS_REG_FREQ_LUT 0x100
> #define EPSS_REG_PERF_STATE 0x320
> +#define EPSS_CORE_OFFSET 0x4
> +#define EPSS_L3_VOTE_REG(base, cpu)\
> + (((base) + EPSS_REG_L3_VOTE) +\
> + ((cpu) * EPSS_CORE_OFFSET))
>
> -#define OSM_L3_MAX_LINKS 1
> +#define L3_DOMAIN_CNT 4
> +#define L3_MAX_LINKS 9
>
> #define to_qcom_provider(_provider) \
> container_of(_provider, struct qcom_osm_l3_icc_provider, provider)
>
> +/**
> + * @domain_base: an array of base address for each clock domain
> + * @max_state: max supported frequency level
> + * @per_core_dcvs: flag used to indicate whether the frequency scaling
> + * for each core is enabled
> + * @reg_perf_state: requested frequency level
> + * @lut_tables: an array of supported frequency levels
> + * @provider: interconnect provider of this node
> + */
> struct qcom_osm_l3_icc_provider {
> - void __iomem *base;
> + void __iomem *domain_base[L3_DOMAIN_CNT];
> unsigned int max_state;
> + bool per_core_dcvs;
> unsigned int reg_perf_state;
> unsigned long lut_tables[LUT_MAX_ENTRIES];
> struct icc_provider provider;
> @@ -55,34 +72,41 @@ struct qcom_osm_l3_icc_provider {
> * @id: a unique node identifier
> * @num_links: the total number of @links
> * @buswidth: width of the interconnect between a node and the bus
> + * @domain: clock domain of the cpu node
> + * @cpu: cpu instance within its clock domain
> */
> struct qcom_icc_node {
> const char *name;
> - u16 links[OSM_L3_MAX_LINKS];
> + u16 links[L3_MAX_LINKS];
> u16 id;
> u16 num_links;
> u16 buswidth;
> + u16 domain;
> + int cpu;
unsigned int? Or is -1 intended for no cpu? If we keep int, please
document -1 as special.
> };
>
> struct qcom_icc_desc {
> const struct qcom_icc_node **nodes;
> size_t num_nodes;
> + bool per_core_dcvs;
> unsigned int lut_row_size;
> unsigned int reg_freq_lut;
> unsigned int reg_perf_state;
> };
>
> -#define DEFINE_QNODE(_name, _id, _buswidth, ...) \
> - static const struct qcom_icc_node _name = { \
> - .name = #_name, \
> - .id = _id, \
> - .buswidth = _buswidth, \
> - .num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })), \
> - .links = { __VA_ARGS__ }, \
> +#define DEFINE_QNODE(_name, _id, _buswidth, _domain, _cpu, ...) \
> + static const struct qcom_icc_node _name = { \
> + .name = #_name, \
> + .id = _id, \
> + .buswidth = _buswidth, \
> + .domain = _domain, \
> + .cpu = _cpu, \
> + .num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })), \
> + .links = { __VA_ARGS__ }, \
> }
>
> -DEFINE_QNODE(sdm845_osm_apps_l3, SDM845_MASTER_OSM_L3_APPS, 16, SDM845_SLAVE_OSM_L3);
> -DEFINE_QNODE(sdm845_osm_l3, SDM845_SLAVE_OSM_L3, 16);
> +DEFINE_QNODE(sdm845_osm_apps_l3, SDM845_MASTER_OSM_L3_APPS, 16, 0, 0, SDM845_SLAVE_OSM_L3);
> +DEFINE_QNODE(sdm845_osm_l3, SDM845_SLAVE_OSM_L3, 16, 0, 0);
Please avoid making these changes. Instead, have a common macro
__DEFINE_QNODE() that takes all the arguments and then leave
DEFINE_QNODE alone and have it pass 0 by default for the ones that are
new and make a new define for newer SoCs like DEFINE_DOMAIN_QNODE (or a
better name) that takes the new arguments. Then we don't have to review
the older SoCs and figure out what changed.
>
> static const struct qcom_icc_node *sdm845_osm_l3_nodes[] = {
> [MASTER_OSM_L3_APPS] = &sdm845_osm_apps_l3,
> @@ -97,8 +121,8 @@ static const struct qcom_icc_desc sdm845_icc_osm_l3 = {
> .reg_perf_state = OSM_REG_PERF_STATE,
> };
>
> -DEFINE_QNODE(sc7180_osm_apps_l3, SC7180_MASTER_OSM_L3_APPS, 16, SC7180_SLAVE_OSM_L3);
> -DEFINE_QNODE(sc7180_osm_l3, SC7180_SLAVE_OSM_L3, 16);
> +DEFINE_QNODE(sc7180_osm_apps_l3, SC7180_MASTER_OSM_L3_APPS, 16, 0, 0, SC7180_SLAVE_OSM_L3);
> +DEFINE_QNODE(sc7180_osm_l3, SC7180_SLAVE_OSM_L3, 16, 0, 0);
>
> static const struct qcom_icc_node *sc7180_osm_l3_nodes[] = {
> [MASTER_OSM_L3_APPS] = &sc7180_osm_apps_l3,
> @@ -113,8 +137,8 @@ static const struct qcom_icc_desc sc7180_icc_osm_l3 = {
> .reg_perf_state = OSM_REG_PERF_STATE,
> };
>
> -DEFINE_QNODE(sm8150_osm_apps_l3, SM8150_MASTER_OSM_L3_APPS, 32, SM8150_SLAVE_OSM_L3);
> -DEFINE_QNODE(sm8150_osm_l3, SM8150_SLAVE_OSM_L3, 32);
> +DEFINE_QNODE(sm8150_osm_apps_l3, SM8150_MASTER_OSM_L3_APPS, 32, 0, 0, SM8150_SLAVE_OSM_L3);
> +DEFINE_QNODE(sm8150_osm_l3, SM8150_SLAVE_OSM_L3, 32, 0, 0);
>
> static const struct qcom_icc_node *sm8150_osm_l3_nodes[] = {
> [MASTER_OSM_L3_APPS] = &sm8150_osm_apps_l3,
> @@ -129,8 +153,8 @@ static const struct qcom_icc_desc sm8150_icc_osm_l3 = {
> .reg_perf_state = OSM_REG_PERF_STATE,
> };
>
> -DEFINE_QNODE(sm8250_epss_apps_l3, SM8250_MASTER_EPSS_L3_APPS, 32, SM8250_SLAVE_EPSS_L3);
> -DEFINE_QNODE(sm8250_epss_l3, SM8250_SLAVE_EPSS_L3, 32);
> +DEFINE_QNODE(sm8250_epss_apps_l3, SM8250_MASTER_EPSS_L3_APPS, 32, 0, 0, SM8250_SLAVE_EPSS_L3);
> +DEFINE_QNODE(sm8250_epss_l3, SM8250_SLAVE_EPSS_L3, 32, 0, 0);
>
> static const struct qcom_icc_node *sm8250_epss_l3_nodes[] = {
> [MASTER_EPSS_L3_APPS] = &sm8250_epss_apps_l3,
Because it is quite a few!
> @@ -145,6 +169,39 @@ static const struct qcom_icc_desc sm8250_icc_epss_l3 = {
> .reg_perf_state = EPSS_REG_PERF_STATE,
> };
>
> +DEFINE_QNODE(sc7280_epss_apps_l3, SC7280_MASTER_EPSS_L3_APPS, 32, 0, 0, SC7280_SLAVE_EPSS_L3_SHARED, SC7280_SLAVE_EPSS_L3_CPU0, SC7280_SLAVE_EPSS_L3_CPU1, SC7280_SLAVE_EPSS_L3_CPU2, SC7280_SLAVE_EPSS_L3_CPU3, SC7280_SLAVE_EPSS_L3_CPU4, SC7280_SLAVE_EPSS_L3_CPU5, SC7280_SLAVE_EPSS_L3_CPU6, SC7280_SLAVE_EPSS_L3_CPU7);
Surely this line can be split up?
> +DEFINE_QNODE(sc7280_epss_l3_shared, SC7280_SLAVE_EPSS_L3_SHARED, 32, 0, 0);
> +DEFINE_QNODE(sc7280_epss_l3_cpu0, SC7280_SLAVE_EPSS_L3_CPU0, 32, 1, 0);
> +DEFINE_QNODE(sc7280_epss_l3_cpu1, SC7280_SLAVE_EPSS_L3_CPU1, 32, 1, 1);
> +DEFINE_QNODE(sc7280_epss_l3_cpu2, SC7280_SLAVE_EPSS_L3_CPU2, 32, 1, 2);
> +DEFINE_QNODE(sc7280_epss_l3_cpu3, SC7280_SLAVE_EPSS_L3_CPU3, 32, 1, 3);
> +DEFINE_QNODE(sc7280_epss_l3_cpu4, SC7280_SLAVE_EPSS_L3_CPU4, 32, 2, 0);
> +DEFINE_QNODE(sc7280_epss_l3_cpu5, SC7280_SLAVE_EPSS_L3_CPU5, 32, 2, 1);
> +DEFINE_QNODE(sc7280_epss_l3_cpu6, SC7280_SLAVE_EPSS_L3_CPU6, 32, 2, 2);
> +DEFINE_QNODE(sc7280_epss_l3_cpu7, SC7280_SLAVE_EPSS_L3_CPU7, 32, 3, 0);
> +
> +static const struct qcom_icc_node *sc7280_epss_l3_nodes[] = {
> + [MASTER_EPSS_L3_APPS] = &sc7280_epss_apps_l3,
> + [SLAVE_EPSS_L3_SHARED] = &sc7280_epss_l3_shared,
> + [SLAVE_EPSS_L3_CPU0] = &sc7280_epss_l3_cpu0,
> + [SLAVE_EPSS_L3_CPU1] = &sc7280_epss_l3_cpu1,
> + [SLAVE_EPSS_L3_CPU2] = &sc7280_epss_l3_cpu2,
> + [SLAVE_EPSS_L3_CPU3] = &sc7280_epss_l3_cpu3,
> + [SLAVE_EPSS_L3_CPU4] = &sc7280_epss_l3_cpu4,
> + [SLAVE_EPSS_L3_CPU5] = &sc7280_epss_l3_cpu5,
> + [SLAVE_EPSS_L3_CPU6] = &sc7280_epss_l3_cpu6,
> + [SLAVE_EPSS_L3_CPU7] = &sc7280_epss_l3_cpu7,
> +};
> +
> +static const struct qcom_icc_desc sc7280_icc_epss_l3 = {
> + .nodes = sc7280_epss_l3_nodes,
> + .num_nodes = ARRAY_SIZE(sc7280_epss_l3_nodes),
> + .per_core_dcvs = true,
> + .lut_row_size = EPSS_LUT_ROW_SIZE,
> + .reg_freq_lut = EPSS_REG_FREQ_LUT,
> + .reg_perf_state = EPSS_REG_PERF_STATE,
> +};
> +
> static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
> {
> struct qcom_osm_l3_icc_provider *qp;
> @@ -156,13 +213,18 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
> u32 agg_avg = 0;
> u64 rate;
>
> - qn = src->data;
> + qn = dst->data;
> provider = src->provider;
> qp = to_qcom_provider(provider);
>
> - list_for_each_entry(n, &provider->nodes, node_list)
> - provider->aggregate(n, 0, n->avg_bw, n->peak_bw,
> - &agg_avg, &agg_peak);
> + /* Skip aggregation when per core l3 scaling is enabled */
> + if (qp->per_core_dcvs) {
> + agg_peak = dst->peak_bw;
> + } else {
> + list_for_each_entry(n, &provider->nodes, node_list)
> + provider->aggregate(n, 0, n->avg_bw, n->peak_bw,
> + &agg_avg, &agg_peak);
> + }
Maybe make this a function like
agg_peak = qcom_icc_calc_aggregate_peak();
so the indenting of the list_for_each_entry can be avoided
if (qp->per_core_dcvs)
return dst->peak_bw;
list_for_each_entry(n, &provider->nodes, node_list)
provider->aggregate(n, 0, n->avg_bw, n->peak_bw, &agg_avg,
&agg_peak);
return agg_peak;
you get the idea.
> @@ -173,7 +235,10 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
This function name really should be different. There are other
qcom_icc_set()s already so the tag space is cluttered.
> break;
> }
>
> - writel_relaxed(index, qp->base + qp->reg_perf_state);
> + if (qp->per_core_dcvs)
> + writel_relaxed(index, EPSS_L3_VOTE_REG(qp->domain_base[qn->domain], qn->cpu));
> + else
> + writel_relaxed(index, qp->domain_base[qn->domain] + qp->reg_perf_state);
>
> return 0;
> }
> @@ -194,11 +259,12 @@ static int qcom_osm_l3_probe(struct platform_device *pdev)
> const struct qcom_icc_desc *desc;
> struct icc_onecell_data *data;
> struct icc_provider *provider;
> + struct property *prop;
> const struct qcom_icc_node **qnodes;
> struct icc_node *node;
> size_t num_nodes;
> struct clk *clk;
> - int ret;
> + int ret, index, domain_count;
>
> clk = clk_get(&pdev->dev, "xo");
> if (IS_ERR(clk))
> @@ -218,12 +284,21 @@ static int qcom_osm_l3_probe(struct platform_device *pdev)
> if (!qp)
> return -ENOMEM;
>
> - qp->base = devm_platform_ioremap_resource(pdev, 0);
> - if (IS_ERR(qp->base))
> - return PTR_ERR(qp->base);
> + prop = of_find_property(pdev->dev.of_node, "reg", NULL);
> + if (!prop)
> + return -EINVAL;
> + domain_count = prop->length / (4 * sizeof(prop->length));
> + if (!domain_count)
> + return -EINVAL;
This is counting reg properties? Most definitely this is wrong as
#address-cells or #size-cells could be different than what this code is
expecting. Maybe roll a loop over of_get_address() and then consider
using that? Or just hardcode the expected number of reg properties based
on the compatible string.
> +
> + for (index = 0; index < domain_count ; index++) {
> + qp->domain_base[index] = devm_platform_ioremap_resource(pdev, index);
> + if (IS_ERR(qp->domain_base[index]))
> + return PTR_ERR(qp->domain_base[index]);
> + }
>
> /* HW should be in enabled state to proceed */
> - if (!(readl_relaxed(qp->base + REG_ENABLE) & 0x1)) {
> + if (!(readl_relaxed(qp->domain_base[0] + REG_ENABLE) & 0x1)) {
> dev_err(&pdev->dev, "error hardware not enabled\n");
> return -ENODEV;
> }
> @@ -235,7 +310,7 @@ static int qcom_osm_l3_probe(struct platform_device *pdev)
> qp->reg_perf_state = desc->reg_perf_state;
>
> for (i = 0; i < LUT_MAX_ENTRIES; i++) {
> - info = readl_relaxed(qp->base + desc->reg_freq_lut +
> + info = readl_relaxed(qp->domain_base[0] + desc->reg_freq_lut +
So is the first address a special "global" IO region that hols the LUT
for everyone?
> i * desc->lut_row_size);
> src = FIELD_GET(LUT_SRC, info);
> lval = FIELD_GET(LUT_L_VAL, info);
> @@ -254,6 +329,7 @@ static int qcom_osm_l3_probe(struct platform_device *pdev)
> prev_freq = freq;
> }
> qp->max_state = i;
> + qp->per_core_dcvs = desc->per_core_dcvs;
>
> qnodes = desc->nodes;
> num_nodes = desc->num_nodes;
> diff --git a/drivers/interconnect/qcom/sc7280.h b/drivers/interconnect/qcom/sc7280.h
> index 175e400..5df7600 100644
> --- a/drivers/interconnect/qcom/sc7280.h
> +++ b/drivers/interconnect/qcom/sc7280.h
> @@ -150,5 +150,15 @@
> #define SC7280_SLAVE_PCIE_1 139
> #define SC7280_SLAVE_QDSS_STM 140
> #define SC7280_SLAVE_TCU 141
> +#define SC7280_MASTER_EPSS_L3_APPS 142
> +#define SC7280_SLAVE_EPSS_L3_SHARED 143
> +#define SC7280_SLAVE_EPSS_L3_CPU0 144
> +#define SC7280_SLAVE_EPSS_L3_CPU1 145
> +#define SC7280_SLAVE_EPSS_L3_CPU2 146
> +#define SC7280_SLAVE_EPSS_L3_CPU3 147
> +#define SC7280_SLAVE_EPSS_L3_CPU4 148
> +#define SC7280_SLAVE_EPSS_L3_CPU5 149
> +#define SC7280_SLAVE_EPSS_L3_CPU6 150
> +#define SC7280_SLAVE_EPSS_L3_CPU7 151
Can we stop using master and slave here? I know it's part of AXI
terminology but I'm hoping they've come up with some better terms to use
now.
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