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drm/radeon: implement apci perf request
These functions use acpi methods to adjust the pcie gen speed. Used by DPM. Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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9d45ad5aff
commit
e37e6a0e4f
2 changed files with 143 additions and 21 deletions
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@ -2458,7 +2458,7 @@ extern int radeon_acpi_init(struct radeon_device *rdev);
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extern void radeon_acpi_fini(struct radeon_device *rdev);
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extern bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev);
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extern int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
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u8 ref_req, bool advertise);
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u8 perf_req, bool advertise);
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extern int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev);
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#else
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static inline int radeon_acpi_init(struct radeon_device *rdev) { return 0; }
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@ -78,28 +78,21 @@ struct atcs_verify_interface {
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u32 function_bits; /* supported functions bit vector */
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} __packed;
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bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
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{
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/* XXX: query ATIF */
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#define ATCS_VALID_FLAGS_MASK 0x3
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return false;
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}
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struct atcs_pref_req_input {
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u16 size; /* structure size in bytes (includes size field) */
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u16 client_id; /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
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u16 valid_flags_mask; /* valid flags mask */
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u16 flags; /* flags */
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u8 req_type; /* request type */
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u8 perf_req; /* performance request */
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} __packed;
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int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
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{
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/* XXX: call appropriate ATIF method */
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return -EINVAL;
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}
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int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
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u8 ref_req, bool advertise)
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{
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/* XXX: call appropriate ATIF method */
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return -EINVAL;
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}
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struct atcs_pref_req_output {
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u16 size; /* structure size in bytes (includes size field) */
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u8 ret_val; /* return value */
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} __packed;
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/* Call the ATIF method
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*/
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@ -528,6 +521,135 @@ static int radeon_atcs_verify_interface(acpi_handle handle,
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return err;
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}
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/**
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* radeon_acpi_is_pcie_performance_request_supported
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*
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* @rdev: radeon_device pointer
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*
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* Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
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* are supported (all asics).
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* returns true if supported, false if not.
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*/
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bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
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{
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struct radeon_atcs *atcs = &rdev->atcs;
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if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
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return true;
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return false;
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}
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/**
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* radeon_acpi_pcie_notify_device_ready
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*
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* @rdev: radeon_device pointer
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*
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* Executes the PCIE_DEVICE_READY_NOTIFICATION method
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* (all asics).
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* returns 0 on success, error on failure.
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*/
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int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
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{
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acpi_handle handle;
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union acpi_object *info;
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struct radeon_atcs *atcs = &rdev->atcs;
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/* Get the device handle */
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handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
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if (!handle)
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return -EINVAL;
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if (!atcs->functions.pcie_dev_rdy)
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return -EINVAL;
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info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
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if (!info)
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return -EIO;
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kfree(info);
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return 0;
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}
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/**
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* radeon_acpi_pcie_performance_request
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*
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* @rdev: radeon_device pointer
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* @perf_req: requested perf level (pcie gen speed)
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* @advertise: set advertise caps flag if set
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*
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* Executes the PCIE_PERFORMANCE_REQUEST method to
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* change the pcie gen speed (all asics).
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* returns 0 on success, error on failure.
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*/
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int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
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u8 perf_req, bool advertise)
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{
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acpi_handle handle;
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union acpi_object *info;
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struct radeon_atcs *atcs = &rdev->atcs;
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struct atcs_pref_req_input atcs_input;
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struct atcs_pref_req_output atcs_output;
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struct acpi_buffer params;
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size_t size;
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u32 retry = 3;
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/* Get the device handle */
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handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
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if (!handle)
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return -EINVAL;
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if (!atcs->functions.pcie_perf_req)
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return -EINVAL;
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atcs_input.size = sizeof(struct atcs_pref_req_input);
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/* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
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atcs_input.client_id = rdev->pdev->devfn | (rdev->pdev->bus->number << 8);
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atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
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atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
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if (advertise)
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atcs_input.flags |= ATCS_ADVERTISE_CAPS;
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atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
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atcs_input.perf_req = perf_req;
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params.length = sizeof(struct atcs_pref_req_input);
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params.pointer = &atcs_input;
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while (retry--) {
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info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
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if (!info)
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return -EIO;
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memset(&atcs_output, 0, sizeof(atcs_output));
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size = *(u16 *) info->buffer.pointer;
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if (size < 3) {
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DRM_INFO("ATCS buffer is too small: %zu\n", size);
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kfree(info);
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return -EINVAL;
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}
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size = min(sizeof(atcs_output), size);
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memcpy(&atcs_output, info->buffer.pointer, size);
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kfree(info);
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switch (atcs_output.ret_val) {
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case ATCS_REQUEST_REFUSED:
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default:
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return -EINVAL;
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case ATCS_REQUEST_COMPLETE:
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return 0;
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case ATCS_REQUEST_IN_PROGRESS:
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udelay(10);
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break;
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}
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}
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return 0;
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}
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/**
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* radeon_acpi_event - handle notify events
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*
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