drm/amdgpu: add core driver (v4)

This adds the non-asic specific core driver code.

v2: remove extra kconfig option
v3: implement minor fixes from Fengguang Wu
v4: fix cast in amdgpu_ucode.c

Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 572 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
new file mode 100644
index 000000000000..3f7aaa45bf8e
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
@@ -0,0 +1,572 @@
+/*
+ * Copyright (c) 2010 Red Hat Inc.
+ * Author : Dave Airlie <airlied@redhat.com>
+ *
+ * Licensed under GPLv2
+ *
+ * ATPX support for both Intel/ATI
+ */
+#include <linux/vga_switcheroo.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/pci.h>
+
+#include "amdgpu_acpi.h"
+
+struct amdgpu_atpx_functions {
+        bool px_params;
+        bool power_cntl;
+        bool disp_mux_cntl;
+        bool i2c_mux_cntl;
+        bool switch_start;
+        bool switch_end;
+        bool disp_connectors_mapping;
+        bool disp_detetion_ports;
+};
+
+struct amdgpu_atpx {
+        acpi_handle handle;
+        struct amdgpu_atpx_functions functions;
+};
+
+static struct amdgpu_atpx_priv {
+        bool atpx_detected;
+        /* handle for device - and atpx */
+        acpi_handle dhandle;
+        acpi_handle other_handle;
+        struct amdgpu_atpx atpx;
+} amdgpu_atpx_priv;
+
+struct atpx_verify_interface {
+        u16 size;               /* structure size in bytes (includes size field) */
+        u16 version;            /* version */
+        u32 function_bits;      /* supported functions bit vector */
+} __packed;
+
+struct atpx_px_params {
+        u16 size;               /* structure size in bytes (includes size field) */
+        u32 valid_flags;        /* which flags are valid */
+        u32 flags;              /* flags */
+} __packed;
+
+struct atpx_power_control {
+        u16 size;
+        u8 dgpu_state;
+} __packed;
+
+struct atpx_mux {
+        u16 size;
+        u16 mux;
+} __packed;
+
+bool amdgpu_has_atpx(void) {
+        return amdgpu_atpx_priv.atpx_detected;
+}
+
+/**
+ * amdgpu_atpx_call - call an ATPX method
+ *
+ * @handle: acpi handle
+ * @function: the ATPX function to execute
+ * @params: ATPX function params
+ *
+ * Executes the requested ATPX function (all asics).
+ * Returns a pointer to the acpi output buffer.
+ */
+static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function,
+                                           struct acpi_buffer *params)
+{
+        acpi_status status;
+        union acpi_object atpx_arg_elements[2];
+        struct acpi_object_list atpx_arg;
+        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+        atpx_arg.count = 2;
+        atpx_arg.pointer = &atpx_arg_elements[0];
+
+        atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
+        atpx_arg_elements[0].integer.value = function;
+
+        if (params) {
+                atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
+                atpx_arg_elements[1].buffer.length = params->length;
+                atpx_arg_elements[1].buffer.pointer = params->pointer;
+        } else {
+                /* We need a second fake parameter */
+                atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
+                atpx_arg_elements[1].integer.value = 0;
+        }
+
+        status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
+
+        /* Fail only if calling the method fails and ATPX is supported */
+        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+                printk("failed to evaluate ATPX got %s\n",
+                       acpi_format_exception(status));
+                kfree(buffer.pointer);
+                return NULL;
+        }
+
+        return buffer.pointer;
+}
+
+/**
+ * amdgpu_atpx_parse_functions - parse supported functions
+ *
+ * @f: supported functions struct
+ * @mask: supported functions mask from ATPX
+ *
+ * Use the supported functions mask from ATPX function
+ * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
+ * are supported (all asics).
+ */
+static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask)
+{
+        f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
+        f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
+        f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
+        f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
+        f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
+        f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
+        f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
+        f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
+}
+
+/**
+ * amdgpu_atpx_validate_functions - validate ATPX functions
+ *
+ * @atpx: amdgpu atpx struct
+ *
+ * Validate that required functions are enabled (all asics).
+ * returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
+{
+        /* make sure required functions are enabled */
+        /* dGPU power control is required */
+        atpx->functions.power_cntl = true;
+
+        if (atpx->functions.px_params) {
+                union acpi_object *info;
+                struct atpx_px_params output;
+                size_t size;
+                u32 valid_bits;
+
+                info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
+                if (!info)
+                        return -EIO;
+
+                memset(&output, 0, sizeof(output));
+
+                size = *(u16 *) info->buffer.pointer;
+                if (size < 10) {
+                        printk("ATPX buffer is too small: %zu\n", size);
+                        kfree(info);
+                        return -EINVAL;
+                }
+                size = min(sizeof(output), size);
+
+                memcpy(&output, info->buffer.pointer, size);
+
+                valid_bits = output.flags & output.valid_flags;
+                /* if separate mux flag is set, mux controls are required */
+                if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
+                        atpx->functions.i2c_mux_cntl = true;
+                        atpx->functions.disp_mux_cntl = true;
+                }
+                /* if any outputs are muxed, mux controls are required */
+                if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
+                                  ATPX_TV_SIGNAL_MUXED |
+                                  ATPX_DFP_SIGNAL_MUXED))
+                        atpx->functions.disp_mux_cntl = true;
+
+                kfree(info);
+        }
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_verify_interface - verify ATPX
+ *
+ * @atpx: amdgpu atpx struct
+ *
+ * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
+ * to initialize ATPX and determine what features are supported
+ * (all asics).
+ * returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx)
+{
+        union acpi_object *info;
+        struct atpx_verify_interface output;
+        size_t size;
+        int err = 0;
+
+        info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
+        if (!info)
+                return -EIO;
+
+        memset(&output, 0, sizeof(output));
+
+        size = *(u16 *) info->buffer.pointer;
+        if (size < 8) {
+                printk("ATPX buffer is too small: %zu\n", size);
+                err = -EINVAL;
+                goto out;
+        }
+        size = min(sizeof(output), size);
+
+        memcpy(&output, info->buffer.pointer, size);
+
+        /* TODO: check version? */
+        printk("ATPX version %u, functions 0x%08x\n",
+               output.version, output.function_bits);
+
+        amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits);
+
+out:
+        kfree(info);
+        return err;
+}
+
+/**
+ * amdgpu_atpx_set_discrete_state - power up/down discrete GPU
+ *
+ * @atpx: atpx info struct
+ * @state: discrete GPU state (0 = power down, 1 = power up)
+ *
+ * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
+ * power down/up the discrete GPU (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
+{
+        struct acpi_buffer params;
+        union acpi_object *info;
+        struct atpx_power_control input;
+
+        if (atpx->functions.power_cntl) {
+                input.size = 3;
+                input.dgpu_state = state;
+                params.length = input.size;
+                params.pointer = &input;
+                info = amdgpu_atpx_call(atpx->handle,
+                                        ATPX_FUNCTION_POWER_CONTROL,
+                                        &params);
+                if (!info)
+                        return -EIO;
+                kfree(info);
+        }
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_disp_mux - switch display mux
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
+ * switch the display mux between the discrete GPU and integrated GPU
+ * (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+        struct acpi_buffer params;
+        union acpi_object *info;
+        struct atpx_mux input;
+
+        if (atpx->functions.disp_mux_cntl) {
+                input.size = 4;
+                input.mux = mux_id;
+                params.length = input.size;
+                params.pointer = &input;
+                info = amdgpu_atpx_call(atpx->handle,
+                                        ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
+                                        &params);
+                if (!info)
+                        return -EIO;
+                kfree(info);
+        }
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
+ * switch the i2c/hpd mux between the discrete GPU and integrated GPU
+ * (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+        struct acpi_buffer params;
+        union acpi_object *info;
+        struct atpx_mux input;
+
+        if (atpx->functions.i2c_mux_cntl) {
+                input.size = 4;
+                input.mux = mux_id;
+                params.length = input.size;
+                params.pointer = &input;
+                info = amdgpu_atpx_call(atpx->handle,
+                                        ATPX_FUNCTION_I2C_MUX_CONTROL,
+                                        &params);
+                if (!info)
+                        return -EIO;
+                kfree(info);
+        }
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_start - notify the sbios of a GPU switch
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
+ * function to notify the sbios that a switch between the discrete GPU and
+ * integrated GPU has begun (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+        struct acpi_buffer params;
+        union acpi_object *info;
+        struct atpx_mux input;
+
+        if (atpx->functions.switch_start) {
+                input.size = 4;
+                input.mux = mux_id;
+                params.length = input.size;
+                params.pointer = &input;
+                info = amdgpu_atpx_call(atpx->handle,
+                                        ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
+                                        &params);
+                if (!info)
+                        return -EIO;
+                kfree(info);
+        }
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_end - notify the sbios of a GPU switch
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
+ * function to notify the sbios that a switch between the discrete GPU and
+ * integrated GPU has ended (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+        struct acpi_buffer params;
+        union acpi_object *info;
+        struct atpx_mux input;
+
+        if (atpx->functions.switch_end) {
+                input.size = 4;
+                input.mux = mux_id;
+                params.length = input.size;
+                params.pointer = &input;
+                info = amdgpu_atpx_call(atpx->handle,
+                                        ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
+                                        &params);
+                if (!info)
+                        return -EIO;
+                kfree(info);
+        }
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_switchto - switch to the requested GPU
+ *
+ * @id: GPU to switch to
+ *
+ * Execute the necessary ATPX functions to switch between the discrete GPU and
+ * integrated GPU (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id)
+{
+        u16 gpu_id;
+
+        if (id == VGA_SWITCHEROO_IGD)
+                gpu_id = ATPX_INTEGRATED_GPU;
+        else
+                gpu_id = ATPX_DISCRETE_GPU;
+
+        amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);
+        amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);
+        amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);
+        amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id);
+
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_power_state - power down/up the requested GPU
+ *
+ * @id: GPU to power down/up
+ * @state: requested power state (0 = off, 1 = on)
+ *
+ * Execute the necessary ATPX function to power down/up the discrete GPU
+ * (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id,
+                                   enum vga_switcheroo_state state)
+{
+        /* on w500 ACPI can't change intel gpu state */
+        if (id == VGA_SWITCHEROO_IGD)
+                return 0;
+
+        amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_pci_probe_handle - look up the ATPX handle
+ *
+ * @pdev: pci device
+ *
+ * Look up the ATPX handles (all asics).
+ * Returns true if the handles are found, false if not.
+ */
+static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev)
+{
+        acpi_handle dhandle, atpx_handle;
+        acpi_status status;
+
+        dhandle = ACPI_HANDLE(&pdev->dev);
+        if (!dhandle)
+                return false;
+
+        status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
+        if (ACPI_FAILURE(status)) {
+                amdgpu_atpx_priv.other_handle = dhandle;
+                return false;
+        }
+        amdgpu_atpx_priv.dhandle = dhandle;
+        amdgpu_atpx_priv.atpx.handle = atpx_handle;
+        return true;
+}
+
+/**
+ * amdgpu_atpx_init - verify the ATPX interface
+ *
+ * Verify the ATPX interface (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_init(void)
+{
+        int r;
+
+        /* set up the ATPX handle */
+        r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx);
+        if (r)
+                return r;
+
+        /* validate the atpx setup */
+        r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx);
+        if (r)
+                return r;
+
+        return 0;
+}
+
+/**
+ * amdgpu_atpx_get_client_id - get the client id
+ *
+ * @pdev: pci device
+ *
+ * look up whether we are the integrated or discrete GPU (all asics).
+ * Returns the client id.
+ */
+static int amdgpu_atpx_get_client_id(struct pci_dev *pdev)
+{
+        if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
+                return VGA_SWITCHEROO_IGD;
+        else
+                return VGA_SWITCHEROO_DIS;
+}
+
+static struct vga_switcheroo_handler amdgpu_atpx_handler = {
+        .switchto = amdgpu_atpx_switchto,
+        .power_state = amdgpu_atpx_power_state,
+        .init = amdgpu_atpx_init,
+        .get_client_id = amdgpu_atpx_get_client_id,
+};
+
+/**
+ * amdgpu_atpx_detect - detect whether we have PX
+ *
+ * Check if we have a PX system (all asics).
+ * Returns true if we have a PX system, false if not.
+ */
+static bool amdgpu_atpx_detect(void)
+{
+        char acpi_method_name[255] = { 0 };
+        struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
+        struct pci_dev *pdev = NULL;
+        bool has_atpx = false;
+        int vga_count = 0;
+
+        while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
+                vga_count++;
+
+                has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
+        }
+
+        while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
+                vga_count++;
+
+                has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
+        }
+
+        if (has_atpx && vga_count == 2) {
+                acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
+                printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
+                       acpi_method_name);
+                amdgpu_atpx_priv.atpx_detected = true;
+                return true;
+        }
+        return false;
+}
+
+/**
+ * amdgpu_register_atpx_handler - register with vga_switcheroo
+ *
+ * Register the PX callbacks with vga_switcheroo (all asics).
+ */
+void amdgpu_register_atpx_handler(void)
+{
+        bool r;
+
+        /* detect if we have any ATPX + 2 VGA in the system */
+        r = amdgpu_atpx_detect();
+        if (!r)
+                return;
+
+        vga_switcheroo_register_handler(&amdgpu_atpx_handler);
+}
+
+/**
+ * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
+ *
+ * Unregister the PX callbacks with vga_switcheroo (all asics).
+ */
+void amdgpu_unregister_atpx_handler(void)
+{
+        vga_switcheroo_unregister_handler();
+}