/* * Copyright 2008 Advanced Micro Devices, Inc. * Copyright 2008 Red Hat Inc. * Copyright 2009 Jerome Glisse. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Dave Airlie *          Alex Deucher *          Jerome Glisse */ #include "amdgpu.h"#include "atom.h" #include <linux/device.h>#include <linux/pci.h>#include <linux/slab.h>#include <linux/acpi.h>#include <linux/vgaarb.h>/* * BIOS. */ #define AMD_VBIOS_SIGNATURE " 761295520"#define AMD_VBIOS_SIGNATURE_OFFSET 0x30#define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)#define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)#define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)#define AMD_VBIOS_LENGTH(p) ((p)[2] << 9) /* Check if current bios is an ATOM BIOS. * Return true if it is ATOM BIOS. Otherwise, return false. */static bool check_atom_bios(struct amdgpu_device *adev, size_t size){	uint16_t tmp, bios_header_start;	uint8_t *bios = adev->bios; 	if (!bios || size < 0x49) {		dev_dbg(adev->dev, "VBIOS mem is null or mem size is wrong\n");		return false;	} 	if (!AMD_IS_VALID_VBIOS(bios)) {		dev_dbg(adev->dev, "VBIOS signature incorrect %x %x\n", bios[0],			bios[1]);		return false;	} 	bios_header_start = bios[0x48] | (bios[0x49] << 8);	if (!bios_header_start) {		dev_dbg(adev->dev, "Can't locate VBIOS header\n");		return false;	} 	tmp = bios_header_start + 4;	if (size < tmp) {		dev_dbg(adev->dev, "VBIOS header is broken\n");		return false;	} 	if (!memcmp(bios + tmp, "ATOM", 4) ||	    !memcmp(bios + tmp, "MOTA", 4)) {		dev_dbg(adev->dev, "ATOMBIOS detected\n");		return true;	} 	return false;} void amdgpu_bios_release(struct amdgpu_device *adev){	kfree(adev->bios);	adev->bios = NULL;	adev->bios_size = 0;} /* If you boot an IGP board with a discrete card as the primary, * the IGP rom is not accessible via the rom bar as the IGP rom is * part of the system bios.  On boot, the system bios puts a * copy of the igp rom at the start of vram if a discrete card is * present. * For SR-IOV, if dynamic critical region is not enabled, * the vbios image is also put at the start of VRAM in the VF. */static bool amdgpu_read_bios_from_vram(struct amdgpu_device *adev){	uint8_t __iomem *bios = NULL;	resource_size_t vram_base;	u32 size = 256U * 1024U; /* ??? */ 	if (!(adev->flags & AMD_IS_APU))		if (amdgpu_device_need_post(adev))			return false; 	/* FB BAR not enabled */	if (pci_resource_len(adev->pdev, 0) == 0)		return false; 	adev->bios = NULL;	vram_base = pci_resource_start(adev->pdev, 0); 	adev->bios = kmalloc(size, GFP_KERNEL);	if (!adev->bios)		return false; 	/* For SRIOV with dynamic critical region is enabled,	 * the vbios image is put at a dynamic offset of VRAM in the VF.	 * If dynamic critical region is disabled, follow the existing logic as on baremetal.	 */	if (amdgpu_sriov_vf(adev) && adev->virt.is_dynamic_crit_regn_enabled) {		if (amdgpu_virt_get_dynamic_data_info(adev,				AMD_SRIOV_MSG_VBIOS_IMG_TABLE_ID, adev->bios, &size)) {			amdgpu_bios_release(adev);			return false;		}	} else {		bios = ioremap_wc(vram_base, size);		if (!bios) {			amdgpu_bios_release(adev);			return false;		} 		memcpy_fromio(adev->bios, bios, size);		iounmap(bios);	} 	adev->bios_size = size; 	if (!check_atom_bios(adev, size)) {		amdgpu_bios_release(adev);		return false;	} 	return true;} bool amdgpu_read_bios(struct amdgpu_device *adev){	uint8_t __iomem *bios;	size_t size; 	adev->bios = NULL;	/* XXX: some cards may return 0 for rom size? ddx has a workaround */	bios = pci_map_rom(adev->pdev, &size);	if (!bios)		return false; 	adev->bios = kzalloc(size, GFP_KERNEL);	if (adev->bios == NULL) {		pci_unmap_rom(adev->pdev, bios);		return false;	}	adev->bios_size = size;	memcpy_fromio(adev->bios, bios, size);	pci_unmap_rom(adev->pdev, bios); 	if (!check_atom_bios(adev, size)) {		amdgpu_bios_release(adev);		return false;	} 	return true;} static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev){	u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};	int len; 	if (!adev->asic_funcs || !adev->asic_funcs->read_bios_from_rom)		return false; 	/* validate VBIOS signature */	if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)		return false;	header[AMD_VBIOS_SIGNATURE_END] = 0; 	if ((!AMD_IS_VALID_VBIOS(header)) ||		memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],		       AMD_VBIOS_SIGNATURE,		       strlen(AMD_VBIOS_SIGNATURE)) != 0)		return false; 	/* valid vbios, go on */	len = AMD_VBIOS_LENGTH(header);	len = ALIGN(len, 4);	adev->bios = kmalloc(len, GFP_KERNEL);	if (!adev->bios) {		DRM_ERROR("no memory to allocate for BIOS\n");		return false;	}	adev->bios_size = len; 	/* read complete BIOS */	amdgpu_asic_read_bios_from_rom(adev, adev->bios, len); 	if (!check_atom_bios(adev, len)) {		amdgpu_bios_release(adev);		return false;	} 	return true;} static bool amdgpu_read_platform_bios(struct amdgpu_device *adev){	phys_addr_t rom = adev->pdev->rom;	size_t romlen = adev->pdev->romlen;	void __iomem *bios; 	adev->bios = NULL; 	if (!rom || romlen == 0)		return false; 	adev->bios = kzalloc(romlen, GFP_KERNEL);	if (!adev->bios)		return false; 	bios = ioremap(rom, romlen);	if (!bios)		goto free_bios; 	memcpy_fromio(adev->bios, bios, romlen);	iounmap(bios); 	if (!check_atom_bios(adev, romlen))		goto free_bios; 	adev->bios_size = romlen; 	return true;free_bios:	amdgpu_bios_release(adev); 	return false;} #ifdef CONFIG_ACPI/* ATRM is used to get the BIOS on the discrete cards in * dual-gpu systems. *//* retrieve the ROM in 4k blocks */#define ATRM_BIOS_PAGE 4096/** * amdgpu_atrm_call - fetch a chunk of the vbios * * @atrm_handle: acpi ATRM handle * @bios: vbios image pointer * @offset: offset of vbios image data to fetch * @len: length of vbios image data to fetch * * Executes ATRM to fetch a chunk of the discrete * vbios image on PX systems (all asics). * Returns the length of the buffer fetched. */static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,			    int offset, int len){	acpi_status status;	union acpi_object atrm_arg_elements[2], *obj;	struct acpi_object_list atrm_arg;	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 	atrm_arg.count = 2;	atrm_arg.pointer = &atrm_arg_elements[0]; 	atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;	atrm_arg_elements[0].integer.value = offset; 	atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;	atrm_arg_elements[1].integer.value = len; 	status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);	if (ACPI_FAILURE(status)) {		DRM_ERROR("failed to evaluate ATRM got %s\n", acpi_format_exception(status));		return -ENODEV;	} 	obj = (union acpi_object *)buffer.pointer;	if (!obj || obj->type != ACPI_TYPE_BUFFER) {		DRM_ERROR("ATRM returned an invalid object\n");		kfree(buffer.pointer);		return -EINVAL;	} 	len = min_t(size_t, obj->buffer.length, len);	memcpy(bios+offset, obj->buffer.pointer, len);	kfree(buffer.pointer);	return len;} static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev){	int ret;	int size = 256 * 1024;	int i;	struct pci_dev *pdev = NULL;	acpi_handle dhandle, atrm_handle;	acpi_status status;	bool found = false; 	/* ATRM is for on-platform devices only */	if (dev_is_removable(&adev->pdev->dev))		return false; 	while ((pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) {		if ((pdev->class != PCI_CLASS_DISPLAY_VGA << 8) &&		    (pdev->class != PCI_CLASS_DISPLAY_OTHER << 8))			continue; 		dhandle = ACPI_HANDLE(&pdev->dev);		if (!dhandle)			continue; 		status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);		if (ACPI_SUCCESS(status)) {			found = true;			break;		}	} 	if (!found)		return false;	pci_dev_put(pdev); 	adev->bios = kmalloc(size, GFP_KERNEL);	if (!adev->bios) {		dev_err(adev->dev, "Unable to allocate bios\n");		return false;	} 	for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {		ret = amdgpu_atrm_call(atrm_handle,				       adev->bios,				       (i * ATRM_BIOS_PAGE),				       ATRM_BIOS_PAGE);		if (ret < ATRM_BIOS_PAGE)			break;	} 	if (!check_atom_bios(adev, size)) {		amdgpu_bios_release(adev);		return false;	}	adev->bios_size = size;	return true;}#elsestatic inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev){	return false;}#endif static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev){	return (!adev->asic_funcs || !adev->asic_funcs->read_disabled_bios) ?		false : amdgpu_asic_read_disabled_bios(adev);} #ifdef CONFIG_ACPI/** * amdgpu_acpi_vfct_match() - Check if a VFCT entry matches the device * @adev: AMDGPU device * @vhdr: VFCT image header to check * * VFCT entries contain the PCI bus number as recorded during BIOS POST. * On systems where the kernel renumbers PCI buses (e.g. pci=realloc or * resource conflicts), the runtime bus number may differ from the POST * value.  Match by device identity (vendor + device + function) and use * the bus number as a preference: exact bus match is preferred, but when * the bus numbers disagree we accept the entry if the device identity * matches. * * Returns: 0 on match, -ENODEV on no match */static int amdgpu_acpi_vfct_match(struct amdgpu_device *adev,				  VFCT_IMAGE_HEADER *vhdr){	/* Vendor and device IDs must always match */	if (vhdr->VendorID != adev->pdev->vendor ||	    vhdr->DeviceID != adev->pdev->device)		return -ENODEV; 	if (vhdr->PCIDevice != PCI_SLOT(adev->pdev->devfn) ||	    vhdr->PCIFunction != PCI_FUNC(adev->pdev->devfn))		return -ENODEV; 	/* Exact bus number match - preferred */	if (vhdr->PCIBus == adev->pdev->bus->number)		return 0; 	/* Bus mismatch but device identity matches (PCI renumbering case) */	dev_notice(adev->dev,		   "VFCT bus number mismatch: table %u != runtime %u, matching by device identity (vendor 0x%04x device 0x%04x)\n",		   vhdr->PCIBus, adev->pdev->bus->number,		   adev->pdev->vendor, adev->pdev->device);	return 0;} static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev){	struct acpi_table_header *hdr;	acpi_size tbl_size;	UEFI_ACPI_VFCT *vfct;	unsigned int offset;	bool r = false; 	if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))		return false;	tbl_size = hdr->length;	if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {		dev_info(adev->dev, "ACPI VFCT table present but broken (too short #1),skipping\n");		goto out;	} 	vfct = (UEFI_ACPI_VFCT *)hdr;	offset = vfct->VBIOSImageOffset; 	while (offset < tbl_size) {		GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);		VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader; 		offset += sizeof(VFCT_IMAGE_HEADER);		if (offset > tbl_size) {			dev_info(adev->dev, "ACPI VFCT image header truncated,skipping\n");			goto out;		} 		offset += vhdr->ImageLength;		if (offset > tbl_size) {			dev_info(adev->dev, "ACPI VFCT image truncated,skipping\n");			goto out;		} 		if (vhdr->ImageLength &&		    !amdgpu_acpi_vfct_match(adev, vhdr)) {			adev->bios = kmemdup(&vbios->VbiosContent,					     vhdr->ImageLength,					     GFP_KERNEL); 			if (!check_atom_bios(adev, vhdr->ImageLength)) {				amdgpu_bios_release(adev);				goto out;			}			adev->bios_size = vhdr->ImageLength;			r = true;			goto out;		}	} 	dev_info(adev->dev, "ACPI VFCT table present but broken (too short #2),skipping\n"); out:	acpi_put_table(hdr);	return r;}#elsestatic inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev){	return false;}#endif static bool amdgpu_get_bios_apu(struct amdgpu_device *adev){	if (amdgpu_acpi_vfct_bios(adev)) {		dev_info(adev->dev, "Fetched VBIOS from VFCT\n");		goto success;	} 	if (amdgpu_read_bios_from_vram(adev)) {		dev_info(adev->dev, "Fetched VBIOS from VRAM BAR\n");		goto success;	} 	if (amdgpu_read_bios(adev)) {		dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");		goto success;	} 

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