--- /dev/null
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+#include <linux/mxm-wmi.h>
+#include <linux/vga_switcheroo.h>
+#include <drm/drm_edid.h>
+#include <acpi/video.h>
+
+#include "nouveau_drm.h"
+#include "nouveau_acpi.h"
+
+#define NOUVEAU_DSM_LED 0x02
+#define NOUVEAU_DSM_LED_STATE 0x00
+#define NOUVEAU_DSM_LED_OFF 0x10
+#define NOUVEAU_DSM_LED_STAMINA 0x11
+#define NOUVEAU_DSM_LED_SPEED 0x12
+
+#define NOUVEAU_DSM_POWER 0x03
+#define NOUVEAU_DSM_POWER_STATE 0x00
+#define NOUVEAU_DSM_POWER_SPEED 0x01
+#define NOUVEAU_DSM_POWER_STAMINA 0x02
+
+#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
+#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
+
+#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
+#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
+#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
+
+#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
+
+/* result of the optimus caps function */
+#define OPTIMUS_ENABLED (1 << 0)
+#define OPTIMUS_STATUS_MASK (3 << 3)
+#define OPTIMUS_STATUS_OFF (0 << 3)
+#define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
+#define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
+#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
+#define OPTIMUS_CAPS_MASK (7 << 24)
+#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
+
+#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
+#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
+
+static struct nouveau_dsm_priv {
+ bool dsm_detected;
+ bool optimus_detected;
+ acpi_handle dhandle;
+ acpi_handle rom_handle;
+} nouveau_dsm_priv;
+
+bool nouveau_is_optimus(void) {
+ return nouveau_dsm_priv.optimus_detected;
+}
+
+bool nouveau_is_v1_dsm(void) {
+ return nouveau_dsm_priv.dsm_detected;
+}
+
+#define NOUVEAU_DSM_HAS_MUX 0x1
+#define NOUVEAU_DSM_HAS_OPT 0x2
+
+#ifdef CONFIG_VGA_SWITCHEROO
+static const char nouveau_dsm_muid[] = {
+ 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
+ 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
+};
+
+static const char nouveau_op_dsm_muid[] = {
+ 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
+ 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
+};
+
+static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
+{
+ int i;
+ union acpi_object *obj;
+ char args_buff[4];
+ union acpi_object argv4 = {
+ .buffer.type = ACPI_TYPE_BUFFER,
+ .buffer.length = 4,
+ .buffer.pointer = args_buff
+ };
+
+ /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
+ for (i = 0; i < 4; i++)
+ args_buff[i] = (arg >> i * 8) & 0xFF;
+
+ *result = 0;
+ obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
+ func, &argv4, ACPI_TYPE_BUFFER);
+ if (!obj) {
+ acpi_handle_info(handle, "failed to evaluate _DSM\n");
+ return AE_ERROR;
+ } else {
+ if (obj->buffer.length == 4) {
+ *result |= obj->buffer.pointer[0];
+ *result |= (obj->buffer.pointer[1] << 8);
+ *result |= (obj->buffer.pointer[2] << 16);
+ *result |= (obj->buffer.pointer[3] << 24);
+ }
+ ACPI_FREE(obj);
+ }
+
+ return 0;
+}
+
+/*
+ * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
+ * requirements on the fourth parameter, so a private implementation
+ * instead of using acpi_check_dsm().
+ */
+static int nouveau_check_optimus_dsm(acpi_handle handle)
+{
+ int result;
+
+ /*
+ * Function 0 returns a Buffer containing available functions.
+ * The args parameter is ignored for function 0, so just put 0 in it
+ */
+ if (nouveau_optimus_dsm(handle, 0, 0, &result))
+ return 0;
+
+ /*
+ * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
+ * If the n-th bit is enabled, function n is supported
+ */
+ return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
+}
+
+static int nouveau_dsm(acpi_handle handle, int func, int arg)
+{
+ int ret = 0;
+ union acpi_object *obj;
+ union acpi_object argv4 = {
+ .integer.type = ACPI_TYPE_INTEGER,
+ .integer.value = arg,
+ };
+
+ obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
+ func, &argv4, ACPI_TYPE_INTEGER);
+ if (!obj) {
+ acpi_handle_info(handle, "failed to evaluate _DSM\n");
+ return AE_ERROR;
+ } else {
+ if (obj->integer.value == 0x80000002)
+ ret = -ENODEV;
+ ACPI_FREE(obj);
+ }
+
+ return ret;
+}
+
+static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
+{
+ mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
+ mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
+ return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
+}
+
+static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
+{
+ int arg;
+ if (state == VGA_SWITCHEROO_ON)
+ arg = NOUVEAU_DSM_POWER_SPEED;
+ else
+ arg = NOUVEAU_DSM_POWER_STAMINA;
+ nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
+ return 0;
+}
+
+static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
+{
+ if (!nouveau_dsm_priv.dsm_detected)
+ return 0;
+ if (id == VGA_SWITCHEROO_IGD)
+ return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
+ else
+ return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
+}
+
+static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
+ enum vga_switcheroo_state state)
+{
+ if (id == VGA_SWITCHEROO_IGD)
+ return 0;
+
+ /* Optimus laptops have the card already disabled in
+ * nouveau_switcheroo_set_state */
+ if (!nouveau_dsm_priv.dsm_detected)
+ return 0;
+
+ return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
+}
+
+static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
+{
+ /* easy option one - intel vendor ID means Integrated */
+ if (pdev->vendor == PCI_VENDOR_ID_INTEL)
+ return VGA_SWITCHEROO_IGD;
+
+ /* is this device on Bus 0? - this may need improving */
+ if (pdev->bus->number == 0)
+ return VGA_SWITCHEROO_IGD;
+
+ return VGA_SWITCHEROO_DIS;
+}
+
+static struct vga_switcheroo_handler nouveau_dsm_handler = {
+ .switchto = nouveau_dsm_switchto,
+ .power_state = nouveau_dsm_power_state,
+ .get_client_id = nouveau_dsm_get_client_id,
+};
+
+static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
+{
+ acpi_handle dhandle;
+ int retval = 0;
+
+ dhandle = ACPI_HANDLE(&pdev->dev);
+ if (!dhandle)
+ return false;
+
+ if (!acpi_has_method(dhandle, "_DSM"))
+ return false;
+
+ if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
+ 1 << NOUVEAU_DSM_POWER))
+ retval |= NOUVEAU_DSM_HAS_MUX;
+
+ if (nouveau_check_optimus_dsm(dhandle))
+ retval |= NOUVEAU_DSM_HAS_OPT;
+
+ if (retval & NOUVEAU_DSM_HAS_OPT) {
+ uint32_t result;
+ nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
+ &result);
+ dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
+ (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
+ (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
+ (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
+ }
+ if (retval)
+ nouveau_dsm_priv.dhandle = dhandle;
+
+ return retval;
+}
+
+static bool nouveau_dsm_detect(void)
+{
+ char acpi_method_name[255] = { 0 };
+ struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
+ struct pci_dev *pdev = NULL;
+ int has_dsm = 0;
+ int has_optimus = 0;
+ int vga_count = 0;
+ bool guid_valid;
+ int retval;
+ bool ret = false;
+
+ /* lookup the MXM GUID */
+ guid_valid = mxm_wmi_supported();
+
+ if (guid_valid)
+ printk("MXM: GUID detected in BIOS\n");
+
+ /* now do DSM detection */
+ while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
+ vga_count++;
+
+ retval = nouveau_dsm_pci_probe(pdev);
+ if (retval & NOUVEAU_DSM_HAS_MUX)
+ has_dsm |= 1;
+ if (retval & NOUVEAU_DSM_HAS_OPT)
+ has_optimus = 1;
+ }
+
+ while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
+ vga_count++;
+
+ retval = nouveau_dsm_pci_probe(pdev);
+ if (retval & NOUVEAU_DSM_HAS_MUX)
+ has_dsm |= 1;
+ if (retval & NOUVEAU_DSM_HAS_OPT)
+ has_optimus = 1;
+ }
+
+ /* find the optimus DSM or the old v1 DSM */
+ if (has_optimus == 1) {
+ acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
+ &buffer);
+ printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
+ acpi_method_name);
+ nouveau_dsm_priv.optimus_detected = true;
+ ret = true;
+ } else if (vga_count == 2 && has_dsm && guid_valid) {
+ acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
+ &buffer);
+ printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
+ acpi_method_name);
+ nouveau_dsm_priv.dsm_detected = true;
+ ret = true;
+ }
+
+
+ return ret;
+}
+
+void nouveau_register_dsm_handler(void)
+{
+ bool r;
+
+ r = nouveau_dsm_detect();
+ if (!r)
+ return;
+
+ vga_switcheroo_register_handler(&nouveau_dsm_handler);
+}
+
+/* Must be called for Optimus models before the card can be turned off */
+void nouveau_switcheroo_optimus_dsm(void)
+{
+ u32 result = 0;
+ if (!nouveau_dsm_priv.optimus_detected)
+ return;
+
+ nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
+ 0x3, &result);
+
+ nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
+ NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
+
+}
+
+void nouveau_unregister_dsm_handler(void)
+{
+ if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
+ vga_switcheroo_unregister_handler();
+}
+#else
+void nouveau_register_dsm_handler(void) {}
+void nouveau_unregister_dsm_handler(void) {}
+void nouveau_switcheroo_optimus_dsm(void) {}
+#endif
+
+/* retrieve the ROM in 4k blocks */
+static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
+ int offset, int len)
+{
+ acpi_status status;
+ union acpi_object rom_arg_elements[2], *obj;
+ struct acpi_object_list rom_arg;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
+
+ rom_arg.count = 2;
+ rom_arg.pointer = &rom_arg_elements[0];
+
+ rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
+ rom_arg_elements[0].integer.value = offset;
+
+ rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
+ rom_arg_elements[1].integer.value = len;
+
+ status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
+ return -ENODEV;
+ }
+ obj = (union acpi_object *)buffer.pointer;
+ memcpy(bios+offset, obj->buffer.pointer, len);
+ kfree(buffer.pointer);
+ return len;
+}
+
+bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
+{
+ acpi_status status;
+ acpi_handle dhandle, rom_handle;
+
+ dhandle = ACPI_HANDLE(&pdev->dev);
+ if (!dhandle)
+ return false;
+
+ status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ nouveau_dsm_priv.rom_handle = rom_handle;
+ return true;
+}
+
+int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
+{
+ return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
+}
+
+void *
+nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
+{
+ struct acpi_device *acpidev;
+ acpi_handle handle;
+ int type, ret;
+ void *edid;
+
+ switch (connector->connector_type) {
+ case DRM_MODE_CONNECTOR_LVDS:
+ case DRM_MODE_CONNECTOR_eDP:
+ type = ACPI_VIDEO_DISPLAY_LCD;
+ break;
+ default:
+ return NULL;
+ }
+
+ handle = ACPI_HANDLE(&dev->pdev->dev);
+ if (!handle)
+ return NULL;
+
+ ret = acpi_bus_get_device(handle, &acpidev);
+ if (ret)
+ return NULL;
+
+ ret = acpi_video_get_edid(acpidev, type, -1, &edid);
+ if (ret < 0)
+ return NULL;
+
+ return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
+}
Code Review / kvmfornfv.git / blobdiff