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Commit e37e6a0e authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/radeon: implement apci perf request 



These functions use acpi methods to adjust the pcie
gen speed.  Used by DPM.

Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 9d45ad5a

drivers/gpu/drm/radeon/radeon.h

+1 −1
Original line number Diff line number Diff line
@@ -2458,7 +2458,7 @@ extern int radeon_acpi_init(struct radeon_device *rdev); 
extern void radeon_acpi_fini(struct radeon_device *rdev);

extern bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev);

extern int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,

						u8 ref_req, bool advertise);

						u8 perf_req, bool advertise);

extern int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev);

#else

static inline int radeon_acpi_init(struct radeon_device *rdev) { return 0; }

drivers/gpu/drm/radeon/radeon_acpi.c

+142 −20
Original line number Diff line number Diff line
@@ -78,28 +78,21 @@ struct atcs_verify_interface { 
	u32 function_bits;	/* supported functions bit vector */

} __packed;



bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)

{

	/* XXX: query ATIF */

#define ATCS_VALID_FLAGS_MASK	0x3



	return false;

}



int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)

{

	/* XXX: call appropriate ATIF method */



	return -EINVAL;



}



int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,

					 u8 ref_req, bool advertise)

{

	/* XXX: call appropriate ATIF method */

struct atcs_pref_req_input {

	u16 size;		/* structure size in bytes (includes size field) */

	u16 client_id;		/* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */

	u16 valid_flags_mask;	/* valid flags mask */

	u16 flags;		/* flags */

	u8 req_type;		/* request type */

	u8 perf_req;		/* performance request */

} __packed;



	return -EINVAL;

}

struct atcs_pref_req_output {

	u16 size;		/* structure size in bytes (includes size field) */

	u8 ret_val;		/* return value */

} __packed;



/* Call the ATIF method

 */
@@ -528,6 +521,135 @@ static int radeon_atcs_verify_interface(acpi_handle handle, 
	return err;

}



/**

 * radeon_acpi_is_pcie_performance_request_supported

 *

 * @rdev: radeon_device pointer

 *

 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods

 * are supported (all asics).

 * returns true if supported, false if not.

 */

bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)

{

	struct radeon_atcs *atcs = &rdev->atcs;



	if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)

		return true;



	return false;

}



/**

 * radeon_acpi_pcie_notify_device_ready

 *

 * @rdev: radeon_device pointer

 *

 * Executes the PCIE_DEVICE_READY_NOTIFICATION method

 * (all asics).

 * returns 0 on success, error on failure.

 */

int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)

{

	acpi_handle handle;

	union acpi_object *info;

	struct radeon_atcs *atcs = &rdev->atcs;



	/* Get the device handle */

	handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);

	if (!handle)

		return -EINVAL;



	if (!atcs->functions.pcie_dev_rdy)

		return -EINVAL;



	info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);

	if (!info)

		return -EIO;



	kfree(info);



	return 0;

}



/**

 * radeon_acpi_pcie_performance_request

 *

 * @rdev: radeon_device pointer

 * @perf_req: requested perf level (pcie gen speed)

 * @advertise: set advertise caps flag if set

 *

 * Executes the PCIE_PERFORMANCE_REQUEST method to

 * change the pcie gen speed (all asics).

 * returns 0 on success, error on failure.

 */

int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,

					 u8 perf_req, bool advertise)

{

	acpi_handle handle;

	union acpi_object *info;

	struct radeon_atcs *atcs = &rdev->atcs;

	struct atcs_pref_req_input atcs_input;

	struct atcs_pref_req_output atcs_output;

	struct acpi_buffer params;

	size_t size;

	u32 retry = 3;



	/* Get the device handle */

	handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);

	if (!handle)

		return -EINVAL;



	if (!atcs->functions.pcie_perf_req)

		return -EINVAL;



	atcs_input.size = sizeof(struct atcs_pref_req_input);

	/* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */

	atcs_input.client_id = rdev->pdev->devfn | (rdev->pdev->bus->number << 8);

	atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;

	atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;

	if (advertise)

		atcs_input.flags |= ATCS_ADVERTISE_CAPS;

	atcs_input.req_type = ATCS_PCIE_LINK_SPEED;

	atcs_input.perf_req = perf_req;



	params.length = sizeof(struct atcs_pref_req_input);

	params.pointer = &atcs_input;



	while (retry--) {

		info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);

		if (!info)

			return -EIO;



		memset(&atcs_output, 0, sizeof(atcs_output));



		size = *(u16 *) info->buffer.pointer;

		if (size < 3) {

			DRM_INFO("ATCS buffer is too small: %zu\n", size);

			kfree(info);

			return -EINVAL;

		}

		size = min(sizeof(atcs_output), size);



		memcpy(&atcs_output, info->buffer.pointer, size);



		kfree(info);



		switch (atcs_output.ret_val) {

		case ATCS_REQUEST_REFUSED:

		default:

			return -EINVAL;

		case ATCS_REQUEST_COMPLETE:

			return 0;

		case ATCS_REQUEST_IN_PROGRESS:

			udelay(10);

			break;

		}

	}



	return 0;

}



/**

 * radeon_acpi_event - handle notify events

 *