| /* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/platform_device.h> |
| #include <linux/coresight.h> |
| |
| #include "adreno.h" |
| |
| #define TO_ADRENO_CORESIGHT_ATTR(_attr) \ |
| container_of(_attr, struct adreno_coresight_attr, attr) |
| |
| ssize_t adreno_coresight_show_register(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| unsigned int val = 0; |
| struct kgsl_device *device = dev_get_drvdata(dev->parent); |
| struct adreno_device *adreno_dev; |
| struct adreno_coresight_attr *cattr = TO_ADRENO_CORESIGHT_ATTR(attr); |
| |
| if (device == NULL) |
| return -EINVAL; |
| |
| adreno_dev = ADRENO_DEVICE(device); |
| |
| if (cattr->reg == NULL) |
| return -EINVAL; |
| |
| /* |
| * Return the current value of the register if coresight is enabled, |
| * otherwise report 0 |
| */ |
| |
| mutex_lock(&device->mutex); |
| if (test_bit(ADRENO_DEVICE_CORESIGHT, &adreno_dev->priv)) { |
| |
| /* |
| * If the device isn't power collapsed read the actual value |
| * from the hardware - otherwise return the cached value |
| */ |
| |
| if (device->state == KGSL_STATE_ACTIVE || |
| device->state == KGSL_STATE_NAP) { |
| if (!kgsl_active_count_get(device)) { |
| kgsl_regread(device, cattr->reg->offset, |
| &cattr->reg->value); |
| kgsl_active_count_put(device); |
| } |
| } |
| |
| val = cattr->reg->value; |
| } |
| mutex_unlock(&device->mutex); |
| |
| return snprintf(buf, PAGE_SIZE, "0x%X\n", val); |
| } |
| |
| ssize_t adreno_coresight_store_register(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct kgsl_device *device = dev_get_drvdata(dev->parent); |
| struct adreno_device *adreno_dev; |
| struct adreno_coresight_attr *cattr = TO_ADRENO_CORESIGHT_ATTR(attr); |
| unsigned long val; |
| int ret; |
| |
| if (device == NULL) |
| return -EINVAL; |
| |
| adreno_dev = ADRENO_DEVICE(device); |
| |
| if (cattr->reg == NULL) |
| return -EINVAL; |
| |
| ret = kstrtoul(buf, 0, &val); |
| if (ret) |
| return ret; |
| |
| mutex_lock(&device->mutex); |
| |
| /* Ignore writes while coresight is off */ |
| if (!test_bit(ADRENO_DEVICE_CORESIGHT, &adreno_dev->priv)) |
| goto out; |
| |
| cattr->reg->value = val; |
| |
| /* Program the hardware if it is not power collapsed */ |
| if (device->state == KGSL_STATE_ACTIVE || |
| device->state == KGSL_STATE_NAP) { |
| if (!kgsl_active_count_get(device)) { |
| kgsl_regwrite(device, cattr->reg->offset, |
| cattr->reg->value); |
| kgsl_active_count_put(device); |
| } |
| } |
| |
| out: |
| mutex_unlock(&device->mutex); |
| return size; |
| } |
| |
| /** |
| * adreno_coresight_disable() - Generic function to disable coresight debugging |
| * @csdev: Pointer to coresight's device struct |
| * |
| * This is a generic function to disable coresight debug bus on adreno |
| * devices. This should be used in all cases of disabling |
| * coresight debug bus for adreno devices. This function in turn calls |
| * the adreno device specific function through the gpudev hook. |
| * This function is registered as the coresight disable function |
| * with coresight driver. It should only be called through coresight driver |
| * as that would ensure that the necessary setup required to be done on |
| * coresight driver's part is also done. |
| */ |
| static void adreno_coresight_disable(struct coresight_device *csdev, |
| struct perf_event *event) |
| { |
| struct kgsl_device *device = dev_get_drvdata(csdev->dev.parent); |
| struct adreno_device *adreno_dev; |
| struct adreno_gpudev *gpudev; |
| struct adreno_coresight *coresight; |
| int i; |
| |
| if (device == NULL) |
| return; |
| |
| adreno_dev = ADRENO_DEVICE(device); |
| gpudev = ADRENO_GPU_DEVICE(adreno_dev); |
| |
| coresight = gpudev->coresight; |
| |
| if (coresight == NULL) |
| return; |
| |
| mutex_lock(&device->mutex); |
| |
| if (!kgsl_active_count_get(device)) { |
| for (i = 0; i < coresight->count; i++) |
| kgsl_regwrite(device, coresight->registers[i].offset, |
| 0); |
| |
| kgsl_active_count_put(device); |
| } |
| |
| clear_bit(ADRENO_DEVICE_CORESIGHT, &adreno_dev->priv); |
| |
| mutex_unlock(&device->mutex); |
| } |
| |
| /** |
| * _adreno_coresight_get_and_clear(): Save the current value of coresight |
| * registers and clear the registers subsequently. Clearing registers |
| * has the effect of disabling coresight. |
| * @adreno_dev: Pointer to adreno device struct |
| */ |
| static int _adreno_coresight_get_and_clear(struct adreno_device *adreno_dev) |
| { |
| struct adreno_gpudev *gpudev = ADRENO_GPU_DEVICE(adreno_dev); |
| struct kgsl_device *device = KGSL_DEVICE(adreno_dev); |
| struct adreno_coresight *coresight = gpudev->coresight; |
| int i; |
| |
| if (coresight == NULL) |
| return -ENODEV; |
| |
| kgsl_pre_hwaccess(device); |
| /* |
| * Save the current value of each coresight register |
| * and then clear each register |
| */ |
| for (i = 0; i < coresight->count; i++) { |
| kgsl_regread(device, coresight->registers[i].offset, |
| &coresight->registers[i].value); |
| kgsl_regwrite(device, coresight->registers[i].offset, |
| 0); |
| } |
| |
| return 0; |
| } |
| |
| static int _adreno_coresight_set(struct adreno_device *adreno_dev) |
| { |
| struct adreno_gpudev *gpudev = ADRENO_GPU_DEVICE(adreno_dev); |
| struct kgsl_device *device = KGSL_DEVICE(adreno_dev); |
| struct adreno_coresight *coresight = gpudev->coresight; |
| int i; |
| |
| if (coresight == NULL) |
| return -ENODEV; |
| |
| for (i = 0; i < coresight->count; i++) |
| kgsl_regwrite(device, coresight->registers[i].offset, |
| coresight->registers[i].value); |
| |
| kgsl_property_read_u32(device, "coresight-atid", |
| (unsigned int *)&(coresight->atid)); |
| |
| return 0; |
| } |
| /** |
| * adreno_coresight_enable() - Generic function to enable coresight debugging |
| * @csdev: Pointer to coresight's device struct |
| * |
| * This is a generic function to enable coresight debug bus on adreno |
| * devices. This should be used in all cases of enabling |
| * coresight debug bus for adreno devices. This function is registered as the |
| * coresight enable function with coresight driver. It should only be called |
| * through coresight driver as that would ensure that the necessary setup |
| * required to be done on coresight driver's part is also done. |
| */ |
| static int adreno_coresight_enable(struct coresight_device *csdev, |
| struct perf_event *event, u32 mode) |
| { |
| struct kgsl_device *device = dev_get_drvdata(csdev->dev.parent); |
| struct adreno_device *adreno_dev; |
| struct adreno_gpudev *gpudev; |
| struct adreno_coresight *coresight; |
| int ret = 0; |
| |
| if (device == NULL) |
| return -ENODEV; |
| |
| adreno_dev = ADRENO_DEVICE(device); |
| gpudev = ADRENO_GPU_DEVICE(adreno_dev); |
| |
| coresight = gpudev->coresight; |
| |
| if (coresight == NULL) |
| return -ENODEV; |
| |
| mutex_lock(&device->mutex); |
| if (!test_and_set_bit(ADRENO_DEVICE_CORESIGHT, &adreno_dev->priv)) { |
| int i; |
| |
| /* Reset all the debug registers to their default values */ |
| |
| for (i = 0; i < coresight->count; i++) |
| coresight->registers[i].value = |
| coresight->registers[i].initial; |
| |
| if (kgsl_state_is_awake(device)) { |
| ret = kgsl_active_count_get(device); |
| if (!ret) { |
| ret = _adreno_coresight_set(adreno_dev); |
| kgsl_active_count_put(device); |
| } |
| } |
| } |
| |
| mutex_unlock(&device->mutex); |
| |
| return ret; |
| } |
| |
| /** |
| * adreno_coresight_start() - Reprogram coresight registers after power collapse |
| * @adreno_dev: Pointer to the adreno device structure |
| * |
| * Cache the current coresight register values so they can be restored after |
| * power collapse |
| */ |
| void adreno_coresight_stop(struct adreno_device *adreno_dev) |
| { |
| if (test_bit(ADRENO_DEVICE_CORESIGHT, &adreno_dev->priv)) |
| _adreno_coresight_get_and_clear(adreno_dev); |
| } |
| |
| /** |
| * adreno_coresight_start() - Reprogram coresight registers after power collapse |
| * @adreno_dev: Pointer to the adreno device structure |
| * |
| * Reprogram the cached values to the coresight registers on power up |
| */ |
| void adreno_coresight_start(struct adreno_device *adreno_dev) |
| { |
| if (test_bit(ADRENO_DEVICE_CORESIGHT, &adreno_dev->priv)) |
| _adreno_coresight_set(adreno_dev); |
| } |
| |
| static int adreno_coresight_trace_id(struct coresight_device *csdev) |
| { |
| struct kgsl_device *device = dev_get_drvdata(csdev->dev.parent); |
| struct adreno_gpudev *gpudev = ADRENO_GPU_DEVICE(ADRENO_DEVICE(device)); |
| |
| return gpudev->coresight->atid; |
| } |
| |
| static const struct coresight_ops_source adreno_coresight_source_ops = { |
| .trace_id = adreno_coresight_trace_id, |
| .enable = adreno_coresight_enable, |
| .disable = adreno_coresight_disable, |
| }; |
| |
| static const struct coresight_ops adreno_coresight_ops = { |
| .source_ops = &adreno_coresight_source_ops, |
| }; |
| |
| void adreno_coresight_remove(struct adreno_device *adreno_dev) |
| { |
| coresight_unregister(adreno_dev->csdev); |
| adreno_dev->csdev = NULL; |
| } |
| |
| int adreno_coresight_init(struct adreno_device *adreno_dev) |
| { |
| int ret = 0; |
| struct adreno_gpudev *gpudev = ADRENO_GPU_DEVICE(adreno_dev); |
| struct kgsl_device *device = KGSL_DEVICE(adreno_dev); |
| struct coresight_desc desc; |
| |
| if (gpudev->coresight == NULL) |
| return -ENODEV; |
| |
| if (!IS_ERR_OR_NULL(adreno_dev->csdev)) |
| return 0; |
| |
| memset(&desc, 0, sizeof(desc)); |
| |
| desc.pdata = of_get_coresight_platform_data(&device->pdev->dev, |
| device->pdev->dev.of_node); |
| if (IS_ERR_OR_NULL(desc.pdata)) |
| return (desc.pdata == NULL) ? -ENODEV : |
| PTR_ERR(desc.pdata); |
| |
| desc.type = CORESIGHT_DEV_TYPE_SOURCE; |
| desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_BUS; |
| desc.ops = &adreno_coresight_ops; |
| desc.dev = &device->pdev->dev; |
| desc.groups = gpudev->coresight->groups; |
| |
| adreno_dev->csdev = coresight_register(&desc); |
| |
| if (IS_ERR(adreno_dev->csdev)) |
| ret = PTR_ERR(adreno_dev->csdev); |
| |
| return ret; |
| } |