On Tue, Apr 10, 2018 at 01:08:13PM -0700, Rishabh Bhatnagar wrote:
> LLCC (Last Level Cache Controller) provides additional cache memory
> in the system. LLCC is partitioned into multiple slices and each
> slice gets its own priority, size, ID and other config parameters.
> LLCC driver programs these parameters for each slice. Clients that
> are assigned to use LLCC need to get information such size & ID of the
> slice they get and activate or deactivate the slice as needed. LLCC driver
> provides API for the clients to perform these operations.
>
> Signed-off-by: Channagoud Kadabi <ckadabi@xxxxxxxxxxxxxx>
> Signed-off-by: Rishabh Bhatnagar <rishabhb@xxxxxxxxxxxxxx>
> ---
> drivers/soc/qcom/Kconfig | 17 ++
> drivers/soc/qcom/Makefile | 2 +
> drivers/soc/qcom/llcc-sdm845.c | 110 ++++++++++
> drivers/soc/qcom/llcc-slice.c | 404 +++++++++++++++++++++++++++++++++++++
> include/linux/soc/qcom/llcc-qcom.h | 168 +++++++++++++++
> 5 files changed, 701 insertions(+)
> create mode 100644 drivers/soc/qcom/llcc-sdm845.c
> create mode 100644 drivers/soc/qcom/llcc-slice.c
> create mode 100644 include/linux/soc/qcom/llcc-qcom.h
<snip>
> diff --git a/drivers/soc/qcom/llcc-sdm845.c b/drivers/soc/qcom/llcc-sdm845.c
> new file mode 100644
> index 0000000..619b226
> --- /dev/null
> +++ b/drivers/soc/qcom/llcc-sdm845.c
> @@ -0,0 +1,110 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/soc/qcom/llcc-qcom.h>
> +
> +/*
> + * SCT(System Cache Table) entry contains of the following parameters
> + * name: Name of the client's use case for which the llcc slice is used
> + * uid: Unique id for the client's use case
> + * slice_id: llcc slice id for each client
> + * max_cap: The maximum capacity of the cache slice provided in KB
> + * priority: Priority of the client used to select victim line for replacement
> + * fixed_size: Determine if the slice has a fixed capacity
> + * bonus_ways: Bonus ways are additional ways to be used for any slice,
> + * if client ends up using more than reserved cache ways. Bonus
> + * ways are allocated only if they are not reserved for some
> + * other client.
> + * res_ways: Reserved ways for the cache slice, the reserved ways cannot
> + * be used by any other client than the one its assigned to.
> + * cache_mode: Each slice operates as a cache, this controls the mode of the
> + * slice: normal or TCM(Tightly Coupled Memory)
> + * probe_target_ways: Determines what ways to probe for access hit. When
> + * configured to 1 only bonus and reserved ways are probed.
> + * When configured to 0 all ways in llcc are probed.
> + * dis_cap_alloc: Disable capacity based allocation for a client
> + * retain_on_pc: If this bit is set and client has maintained active vote
> + * then the ways assigned to this client are not flushed on power
> + * collapse.
> + * activate_on_init: Activate the slice immediately after the SCT is programmed
> + */
> +#define SCT_ENTRY(n, uid, sid, mc, p, fs, bway, rway, cmod, ptw, dca, rp, a) \
> + { \
> + .name = n, \
> + .usecase_id = uid, \
> + .slice_id = sid, \
> + .max_cap = mc, \
> + .priority = p, \
> + .fixed_size = fs, \
> + .bonus_ways = bway, \
> + .res_ways = rway, \
> + .cache_mode = cmod, \
> + .probe_target_ways = ptw, \
> + .dis_cap_alloc = dca, \
> + .retain_on_pc = rp, \
> + .activate_on_init = a, \
> + }
> +
> +
Extra blank line.
> +static struct llcc_slice_config sdm845_data[] = {
> + SCT_ENTRY("cpuss", 1, 1, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 1),
> + SCT_ENTRY("vidsc0", 2, 2, 512, 2, 1, 0x0, 0x0f0, 0, 0, 1, 1, 0),
> + SCT_ENTRY("vidsc1", 3, 3, 512, 2, 1, 0x0, 0x0f0, 0, 0, 1, 1, 0),
> + SCT_ENTRY("rotator", 4, 4, 563, 2, 1, 0x0, 0x00e, 2, 0, 1, 1, 0),
> + SCT_ENTRY("voice", 5, 5, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("audio", 6, 6, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("mdmhpgr", 7, 7, 1024, 2, 0, 0xfc, 0xf00, 0, 0, 1, 1, 0),
> + SCT_ENTRY("modem", 8, 8, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("compute", 10, 10, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("gpuhtw", 11, 11, 512, 1, 1, 0xc, 0x0, 0, 0, 1, 1, 0),
> + SCT_ENTRY("gpu", 12, 12, 2304, 1, 0, 0xff0, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("mmuhwt", 13, 13, 256, 2, 0, 0x0, 0x1, 0, 0, 1, 0, 1),
> + SCT_ENTRY("cmptdma", 15, 15, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("display", 16, 16, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("videofw", 17, 17, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0),
> + SCT_ENTRY("mdmhpfx", 20, 20, 1024, 2, 1, 0x0, 0xf00, 0, 0, 1, 1, 0),
> + SCT_ENTRY("mdmpgng", 21, 21, 1024, 0, 1, 0x1e, 0x0, 0, 0, 1, 1, 0),
> + SCT_ENTRY("audiohw", 22, 22, 1024, 1, 1, 0xffc, 0x2, 0, 0, 1, 1, 0),
> +};
> +
> +
> +static int sdm845_qcom_llcc_probe(struct platform_device *pdev)
> +{
> + return qcom_llcc_probe(pdev, sdm845_data, ARRAY_SIZE(sdm845_data));
> +}
> +
> +static const struct of_device_id sdm845_qcom_llcc_of_match[] = {
> + { .compatible = "qcom,sdm845-llcc", },
> + { },
> +};
> +
> +static struct platform_driver sdm845_qcom_llcc_driver = {
> + .driver = {
> + .name = "sdm845-llcc",
> + .owner = THIS_MODULE,
> + .of_match_table = sdm845_qcom_llcc_of_match,
> + },
> + .probe = sdm845_qcom_llcc_probe,
> +};
> +
> +static int __init sdm845_init_qcom_llcc_init(void)
> +{
> + return platform_driver_register(&sdm845_qcom_llcc_driver);
> +}
> +module_init(sdm845_init_qcom_llcc_init);
> +
> +static void __exit sdm845_exit_qcom_llcc_exit(void)
> +{
> + platform_driver_unregister(&sdm845_qcom_llcc_driver);
> +}
> +module_exit(sdm845_exit_qcom_llcc_exit);
> +
> +MODULE_DESCRIPTION("QTI sdm845 LLCC driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
> new file mode 100644
> index 0000000..67a81b0
> --- /dev/null
> +++ b/drivers/soc/qcom/llcc-slice.c
> @@ -0,0 +1,404 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#include <linux/bitmap.h>
> +#include <linux/bitops.h>
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/mutex.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/soc/qcom/llcc-qcom.h>
> +
> +#define ACTIVATE 0x1
> +#define DEACTIVATE 0x2
> +#define ACT_CTRL_OPCODE_ACTIVATE 0x1
> +#define ACT_CTRL_OPCODE_DEACTIVATE 0x2
> +#define ACT_CTRL_ACT_TRIG 0x1
> +#define ACT_CTRL_OPCODE_SHIFT 0x1
> +#define ATTR1_PROBE_TARGET_WAYS_SHIFT 0x2
> +#define ATTR1_FIXED_SIZE_SHIFT 0x3
> +#define ATTR1_PRIORITY_SHIFT 0x4
> +#define ATTR1_MAX_CAP_SHIFT 0x10
> +#define ATTR0_RES_WAYS_MASK 0x00000fff
> +#define ATR0_BONUS_WAYS_MASK 0x0fff0000
> +#define ATTR0_BONUS_WAYS_SHIFT 0x10
> +#define LLCC_STATUS_READ_DELAY 100
> +
> +#define CACHE_LINE_SIZE_SHIFT 6
> +
> +#define LLCC_COMMON_STATUS0 0x0003000c
> +#define LLCC_LB_CNT_MASK 0xf0000000
> +#define LLCC_LB_CNT_SHIFT 28
> +
> +#define MAX_CAP_TO_BYTES(n) (n * 1024)
> +#define LLCC_TRP_ACT_CTRLn(n) (n * 0x1000)
> +#define LLCC_TRP_STATUSn(n) (4 + n * 0x1000)
> +#define LLCC_TRP_ATTR0_CFGn(n) (0x21000 + 0x8 * n)
> +#define LLCC_TRP_ATTR1_CFGn(n) (0x21004 + 0x8 * n)
> +
> +#define BANK_OFFSET_STRIDE 0x80000
> +
> +static const struct regmap_config llcc_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .fast_io = true,
> +};
> +
> +
Another extra blank line.
> +/* Get the slice entry by index */
> +static struct llcc_slice_desc *llcc_slice_get_entry(struct device *dev, int n)
> +{
> + struct of_phandle_args phargs;
> + struct llcc_drv_data *drv;
> + const struct llcc_slice_config *llcc_data_ptr;
> + struct llcc_slice_desc *desc;
> + struct platform_device *pdev;
> + u32 sz, count;
> +
> + if (of_parse_phandle_with_args(dev->of_node, "cache-slices",
> + "#cache-cells", n, &phargs))
> + return ERR_PTR(-ENODEV);
> +
> + pdev = of_find_device_by_node(phargs.np);
> + if (!pdev)
> + return ERR_PTR(-ENODEV);
> +
> + drv = platform_get_drvdata(pdev);
> + if (!drv)
> + return ERR_PTR(-EFAULT);
> +
> + llcc_data_ptr = drv->cfg;
> + sz = drv->cfg_size;
> + count = 0;
> +
> + while (llcc_data_ptr && count < sz) {
> + if (llcc_data_ptr->usecase_id == phargs.args[0])
> + break;
> + llcc_data_ptr++;
> + count++;
> + }
> +
> + if (llcc_data_ptr == NULL || count == sz)
> + return ERR_PTR(-ENODEV);
> +
> + desc = devm_kzalloc(dev, sizeof(struct llcc_slice_desc), GFP_KERNEL);
> + if (!desc)
> + return ERR_PTR(-ENOMEM);
> +
> + desc->slice_id = llcc_data_ptr->slice_id;
> + desc->slice_size = llcc_data_ptr->max_cap;
> + desc->dev = &pdev->dev;
> +
> + return desc;
> +}
> +
> +/**
> + * llcc_slice_getd - get llcc slice descriptor
> + * @dev: Device pointer of the client
> + * @name: Name of the use case
> + *
> + * A pointer to llcc slice descriptor will be returned on success and
> + * and error pointer is returned on failure
> + */
> +struct llcc_slice_desc *llcc_slice_getd(struct device *dev, const char *name)
> +{
> + struct device_node *np = dev->of_node;
> + int index = 0;
> + const char *slice_name;
> + struct property *prop;
> +
> + if (!np)
> + return ERR_PTR(-ENOENT);
> +
I'm not sure if dev->of_node can be null at this point, but even if it is
of_get_property can safely handle a null pointer so you don't need this
additional check.
> + if (!of_get_property(np, "cache-slice-names", NULL))
> + return ERR_PTR(-ENOENT);
> +
> + of_property_for_each_string(np, "cache-slice-names", prop, slice_name) {
> + if (!strcmp(name, slice_name))
> + break;
> + index++;
> + }
> + return llcc_slice_get_entry(dev, index);
> +}
> +EXPORT_SYMBOL_GPL(llcc_slice_getd);
> +
> +/**
> + * llcc_slice_putd - llcc slice descritpor
> + * @desc: Pointer to llcc slice descriptor
> + */
> +void llcc_slice_putd(struct llcc_slice_desc *desc)
> +{
> + devm_kfree(desc->dev, desc);
> +}
> +EXPORT_SYMBOL_GPL(llcc_slice_putd);
> +
> +static int llcc_update_act_ctrl(struct llcc_drv_data *drv, u32 sid,
> + u32 act_ctrl_reg_val, u32 status)
> +{
> + u32 act_ctrl_reg;
> + u32 status_reg;
> + u32 slice_status;
> + int ret = 0;
> +
> + act_ctrl_reg = drv->bcast_off + LLCC_TRP_ACT_CTRLn(sid);
> + status_reg = drv->bcast_off + LLCC_TRP_STATUSn(sid);
> +
> + /*Set the ACTIVE trigger*/
> + act_ctrl_reg_val |= ACT_CTRL_ACT_TRIG;
> + ret = regmap_write(drv->regmap, act_ctrl_reg, act_ctrl_reg_val);
> + if (ret)
> + return ret;
> +
> + /* Clear the ACTIVE trigger */
> + act_ctrl_reg_val &= ~ACT_CTRL_ACT_TRIG;
> + ret = regmap_write(drv->regmap, act_ctrl_reg, act_ctrl_reg_val);
> + if (ret)
> + return ret;
> +
> + ret = regmap_read_poll_timeout(drv->regmap, status_reg, slice_status,
> + !(slice_status & status), 0, LLCC_STATUS_READ_DELAY);
> + return ret;
> +}
> +
> +/**
> + * llcc_slice_activate - Activate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A value zero will be returned on success and a negative errno will
> + * be returned in error cases
> + */
> +int llcc_slice_activate(struct llcc_slice_desc *desc)
> +{
> + int ret;
> + u32 act_ctrl_val;
> + struct llcc_drv_data *drv;
> +
> + if (desc == NULL)
> + return -EINVAL;
> +
> + drv = dev_get_drvdata(desc->dev);
> + if (!drv)
> + return -EINVAL;
> +
> + mutex_lock(&drv->lock);
> + if (test_bit(desc->slice_id, drv->bitmap)) {
> + mutex_unlock(&drv->lock);
> + return 0;
> + }
> +
> + act_ctrl_val = ACT_CTRL_OPCODE_ACTIVATE << ACT_CTRL_OPCODE_SHIFT;
> +
> + ret = llcc_update_act_ctrl(drv, desc->slice_id, act_ctrl_val,
> + DEACTIVATE);
> +
> + __set_bit(desc->slice_id, drv->bitmap);
> + mutex_unlock(&drv->lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(llcc_slice_activate);
> +
> +/**
> + * llcc_slice_deactivate - Deactivate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A value zero will be returned on success and a negative errno will
> + * be returned in error cases
> + */
> +int llcc_slice_deactivate(struct llcc_slice_desc *desc)
> +{
> + u32 act_ctrl_val;
> + int ret;
> + struct llcc_drv_data *drv;
> +
> + if (desc == NULL)
> + return -EINVAL;
> +
> + drv = dev_get_drvdata(desc->dev);
> + if (!drv)
> + return -EINVAL;
> +
> + mutex_lock(&drv->lock);
> + if (!test_bit(desc->slice_id, drv->bitmap)) {
> + mutex_unlock(&drv->lock);
> + return 0;
> + }
> + act_ctrl_val = ACT_CTRL_OPCODE_DEACTIVATE << ACT_CTRL_OPCODE_SHIFT;
> +
> + ret = llcc_update_act_ctrl(drv, desc->slice_id, act_ctrl_val,
> + ACTIVATE);
> +
> + __clear_bit(desc->slice_id, drv->bitmap);
> + mutex_unlock(&drv->lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(llcc_slice_deactivate);
> +
> +/**
> + * llcc_get_slice_id - return the slice id
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A positive value will be returned on success and a negative errno will
> + * be returned on error
> + */
> +int llcc_get_slice_id(struct llcc_slice_desc *desc)
> +{
> + if (!desc)
> + return -EINVAL;
> +
> + return desc->slice_id;
> +}
> +EXPORT_SYMBOL_GPL(llcc_get_slice_id);
> +
> +/**
> + * llcc_get_slice_size - return the slice id
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A positive value will be returned on success and zero will returned on
> + * error
> + */
> +size_t llcc_get_slice_size(struct llcc_slice_desc *desc)
> +{
> + if (!desc)
> + return 0;
> +
> + return desc->slice_size;
> +}
> +EXPORT_SYMBOL_GPL(llcc_get_slice_size);
> +
> +static int qcom_llcc_cfg_program(struct platform_device *pdev)
> +{
> + int i;
> + u32 attr1_cfg;
> + u32 attr0_cfg;
> + u32 attr1_val;
> + u32 attr0_val;
> + u32 max_cap_cacheline;
> + u32 sz;
> + int ret = 0;
> + const struct llcc_slice_config *llcc_table;
> + struct llcc_slice_desc desc;
> + struct llcc_drv_data *drv = platform_get_drvdata(pdev);
> + u32 bcast_off = drv->bcast_off;
> +
> + sz = drv->cfg_size;
> + llcc_table = drv->cfg;
> +
> + for (i = 0; i < sz; i++) {
> + attr1_cfg = bcast_off +
> + LLCC_TRP_ATTR1_CFGn(llcc_table[i].slice_id);
> + attr0_cfg = bcast_off +
> + LLCC_TRP_ATTR0_CFGn(llcc_table[i].slice_id);
> +
> + attr1_val = llcc_table[i].cache_mode;
> + attr1_val |= llcc_table[i].probe_target_ways <<
> + ATTR1_PROBE_TARGET_WAYS_SHIFT;
> + attr1_val |= llcc_table[i].fixed_size <<
> + ATTR1_FIXED_SIZE_SHIFT;
> + attr1_val |= llcc_table[i].priority << ATTR1_PRIORITY_SHIFT;
> +
> + max_cap_cacheline = MAX_CAP_TO_BYTES(llcc_table[i].max_cap);
> +
> + /* LLCC instances can vary for each target.
> + * The SW writes to broadcast register which gets propagated
> + * to each llcc instace (llcc0,.. llccN).
> + * Since the size of the memory is divided equally amongst the
> + * llcc instances, we need to configure the max cap accordingly.
> + */
> + max_cap_cacheline = max_cap_cacheline / drv->num_banks;
> + max_cap_cacheline >>= CACHE_LINE_SIZE_SHIFT;
> + attr1_val |= max_cap_cacheline << ATTR1_MAX_CAP_SHIFT;
> +
> + attr0_val = llcc_table[i].res_ways & ATTR0_RES_WAYS_MASK;
> + attr0_val |= llcc_table[i].bonus_ways << ATTR0_BONUS_WAYS_SHIFT;
> +
> + ret = regmap_write(drv->regmap, attr1_cfg, attr1_val);
> + if (ret)
> + return ret;
> + ret = regmap_write(drv->regmap, attr0_cfg, attr0_val);
> + if (ret)
> + return ret;
> + if (llcc_table[i].activate_on_init) {
> + desc.slice_id = llcc_table[i].slice_id;
> + desc.dev = &pdev->dev;
> + ret = llcc_slice_activate(&desc);
> + }
> + }
> + return ret;
> +}
> +
> +int qcom_llcc_probe(struct platform_device *pdev,
> + const struct llcc_slice_config *llcc_cfg, u32 sz)
> +{
> +
> + u32 num_banks = 0;
> + struct device *dev = &pdev->dev;
> + struct llcc_drv_data *drv_data;
> + struct resource *res;
> + void __iomem *base;
> + int ret = 0;
> + int i;
> +
> + drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
> + if (!drv_data)
> + return PTR_ERR(drv_data);
Oops, this is obviously not what you want. Should just be a return -ENOMEM.
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + drv_data->regmap = devm_regmap_init_mmio(dev, base,
> + &llcc_regmap_config);
> + if (IS_ERR(drv_data->regmap))
> + return PTR_ERR(drv_data->regmap);
> +
> + ret = regmap_read(drv_data->regmap, LLCC_COMMON_STATUS0,
> + &num_banks);
> + if (ret)
> + return ret;
> +
> + num_banks &= LLCC_LB_CNT_MASK;
> + num_banks >>= LLCC_LB_CNT_SHIFT;
> + drv_data->num_banks = num_banks;
> +
> + ret = of_property_read_u32(pdev->dev.of_node, "max-slices",
> + &drv_data->max_slices);
> + if (ret)
> + return ret;
> +
> + drv_data->offsets = devm_kzalloc(dev, num_banks * sizeof(u32),
> + GFP_KERNEL);
> + if (!drv_data->offsets)
> + return PTR_ERR(drv_data->offsets);
And the same.
> + for (i = 0; i < num_banks; i++)
> + drv_data->offsets[i] = (i * BANK_OFFSET_STRIDE);
> +
> + drv_data->bcast_off = num_banks * BANK_OFFSET_STRIDE;
> +
> + drv_data->bitmap = devm_kcalloc(dev,
> + BITS_TO_LONGS(drv_data->max_slices), sizeof(unsigned long),
> + GFP_KERNEL);
> + if (!drv_data->bitmap)
> + return PTR_ERR(drv_data->bitmap);
Once again.
> + bitmap_zero(drv_data->bitmap, drv_data->max_slices);
> + drv_data->cfg = llcc_cfg;
> + drv_data->cfg_size = sz;
> + mutex_init(&drv_data->lock);
> + platform_set_drvdata(pdev, drv_data);
> +
> + ret = qcom_llcc_cfg_program(pdev);
> +
> + return ret;
return qcom_llc_cfg_program(pdev);
but thats my own personal nit to pick.
> +}
> +EXPORT_SYMBOL_GPL(qcom_llcc_probe);
> diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> new file mode 100644
> index 0000000..3e97569
> --- /dev/null
> +++ b/include/linux/soc/qcom/llcc-qcom.h
> @@ -0,0 +1,168 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#include <linux/platform_device.h>
> +#ifndef __LLCC_QCOM__
> +#define __LLCC_QCOM__
> +/**
> + * llcc_slice_desc - Cache slice descriptor
> + * @slice_id: llcc slice id
> + * @slice_size: Size allocated for the llcc slice
> + * @dev: pointer to llcc device
> + */
> +struct llcc_slice_desc {
> + u32 slice_id;
> + size_t slice_size;
> + struct device *dev;
> +};
> +
> +/**
> + * llcc_slice_config - Data associated with the llcc slice
> + * @name: name of the use case associated with the llcc slice
> + * @usecase_id: usecase id for which the llcc slice is used
> + * @slice_id: llcc slice id assigned to each slice
> + * @max_cap: maximum capacity of the llcc slice
> + * @priority: priority of the llcc slice
> + * @fixed_size: whether the llcc slice can grow beyond its size
> + * @bonus_ways: bonus ways associated with llcc slice
> + * @res_ways: reserved ways associated with llcc slice
> + * @cache_mode: mode of the llcc slice
> + * @probe_target_ways: Probe only reserved and bonus ways on a cache miss
> + * @dis_cap_alloc: Disable capacity based allocation
> + * @retain_on_pc: Retain through power collapse
> + * @activate_on_init: activate the slice on init
> + */
> +struct llcc_slice_config {
> + const char *name;
> + u32 usecase_id;
> + u32 slice_id;
> + u32 max_cap;
> + u32 priority;
> + bool fixed_size;
> + u32 bonus_ways;
> + u32 res_ways;
> + u32 cache_mode;
> + u32 probe_target_ways;
> + bool dis_cap_alloc;
> + bool retain_on_pc;
> + bool activate_on_init;
> +};
> +
> +/**
> + * llcc_drv_data - Data associated with the llcc driver
> + * @regmap: regmap associated with the llcc device
> + * @cfg: pointer to the data structure for slice configuration
> + * @lock: mutex associated with each slice
> + * @cfg_size: size of the config data table
> + * @max_slices: max slices as read from device tree
> + * @bcast_off: Offset of the broadcast bank
> + * @num_banks: Number of llcc banks
> + * @bitmap: Bit map to track the active slice ids
> + * @offsets: Pointer to the bank offsets array
> + */
> +
I'm no kerneldocs expert I think the blank line is frowned upon here.
> +struct llcc_drv_data {
> + struct regmap *regmap;
> + const struct llcc_slice_config *cfg;
> + struct mutex lock;
> + u32 cfg_size;
> + u32 max_slices;
> + u32 bcast_off;
> + u32 num_banks;
> + unsigned long *bitmap;
> + u32 *offsets;
> +};
> +
> +
> +#if IS_ENABLED(CONFIG_QCOM_LLCC)
> +/**
> + * llcc_slice_getd - get llcc slice descriptor
> + * @dev: Device pointer of the client
> + * @name: Name of the use case
> + */
> +struct llcc_slice_desc *llcc_slice_getd(struct device *dev, const char *name);
> +
> +/**
> + * llcc_slice_putd - llcc slice descritpor
> + * @desc: Pointer to llcc slice descriptor
> + */
> +void llcc_slice_putd(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_get_slice_id - get slice id
> + * @desc: Pointer to llcc slice descriptor
> + */
> +int llcc_get_slice_id(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_get_slice_size - llcc slice size
> + * @desc: Pointer to llcc slice descriptor
> + */
> +size_t llcc_get_slice_size(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_slice_activate - Activate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + */
> +int llcc_slice_activate(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_slice_deactivate - Deactivate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + */
> +int llcc_slice_deactivate(struct llcc_slice_desc *desc);
> +
> +/**
> + * qcom_llcc_probe - program the sct table
> + * @pdev: platform device pointer
> + * @table: soc sct table
> + * @sz: Size of the config table
> + */
> +int qcom_llcc_probe(struct platform_device *pdev,
> + const struct llcc_slice_config *table, u32 sz);
> +#else
> +static inline struct llcc_slice_desc *llcc_slice_getd(struct device *dev,
> + const char *name)
> +{
> + return NULL;
> +}
> +
> +static inline void llcc_slice_putd(struct llcc_slice_desc *desc)
> +{
> +
> +};
> +
> +static inline int llcc_get_slice_id(struct llcc_slice_desc *desc)
> +{
> + return -EINVAL;
> +}
> +
> +static inline size_t llcc_get_slice_size(struct llcc_slice_desc *desc)
> +{
> + return 0;
> +}
> +static inline int llcc_slice_activate(struct llcc_slice_desc *desc)
> +{
> + return -EINVAL;
> +}
> +
> +static inline int llcc_slice_deactivate(struct llcc_slice_desc *desc)
> +{
> + return -EINVAL;
> +}
> +static inline int qcom_llcc_probe(struct platform_device *pdev,
> + const struct llcc_slice_config *table, u32 sz)
> +{
> + return -ENODEV;
> +}
> +
> +static inline int qcom_llcc_remove(struct platform_device *pdev)
> +{
> + return -ENODEV;
> +}
> +#endif
> +
> +#endif
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