xref: /linux/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c (revision 97ef3b7f4fdf8ad6818aa2c8201c3b72cc635e16)
1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  */
28 
29 #include "amdgpu.h"
30 #include "atom.h"
31 
32 #include <linux/pci.h>
33 #include <linux/slab.h>
34 #include <linux/acpi.h>
35 /*
36  * BIOS.
37  */
38 
39 #define AMD_VBIOS_SIGNATURE " 761295520"
40 #define AMD_VBIOS_SIGNATURE_OFFSET 0x30
41 #define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)
42 #define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)
43 #define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)
44 #define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)
45 
46 /* Check if current bios is an ATOM BIOS.
47  * Return true if it is ATOM BIOS. Otherwise, return false.
48  */
49 static bool check_atom_bios(uint8_t *bios, size_t size)
50 {
51 	uint16_t tmp, bios_header_start;
52 
53 	if (!bios || size < 0x49) {
54 		DRM_INFO("vbios mem is null or mem size is wrong\n");
55 		return false;
56 	}
57 
58 	if (!AMD_IS_VALID_VBIOS(bios)) {
59 		DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]);
60 		return false;
61 	}
62 
63 	bios_header_start = bios[0x48] | (bios[0x49] << 8);
64 	if (!bios_header_start) {
65 		DRM_INFO("Can't locate bios header\n");
66 		return false;
67 	}
68 
69 	tmp = bios_header_start + 4;
70 	if (size < tmp) {
71 		DRM_INFO("BIOS header is broken\n");
72 		return false;
73 	}
74 
75 	if (!memcmp(bios + tmp, "ATOM", 4) ||
76 	    !memcmp(bios + tmp, "MOTA", 4)) {
77 		DRM_DEBUG("ATOMBIOS detected\n");
78 		return true;
79 	}
80 
81 	return false;
82 }
83 
84 /* If you boot an IGP board with a discrete card as the primary,
85  * the IGP rom is not accessible via the rom bar as the IGP rom is
86  * part of the system bios.  On boot, the system bios puts a
87  * copy of the igp rom at the start of vram if a discrete card is
88  * present.
89  */
90 static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
91 {
92 	uint8_t __iomem *bios;
93 	resource_size_t vram_base;
94 	resource_size_t size = 256 * 1024; /* ??? */
95 
96 	if (!(adev->flags & AMD_IS_APU))
97 		if (amdgpu_device_need_post(adev))
98 			return false;
99 
100 	/* FB BAR not enabled */
101 	if (pci_resource_len(adev->pdev, 0) == 0)
102 		return false;
103 
104 	adev->bios = NULL;
105 	vram_base = pci_resource_start(adev->pdev, 0);
106 	bios = ioremap_wc(vram_base, size);
107 	if (!bios) {
108 		return false;
109 	}
110 
111 	adev->bios = kmalloc(size, GFP_KERNEL);
112 	if (!adev->bios) {
113 		iounmap(bios);
114 		return false;
115 	}
116 	adev->bios_size = size;
117 	memcpy_fromio(adev->bios, bios, size);
118 	iounmap(bios);
119 
120 	if (!check_atom_bios(adev->bios, size)) {
121 		kfree(adev->bios);
122 		return false;
123 	}
124 
125 	return true;
126 }
127 
128 bool amdgpu_read_bios(struct amdgpu_device *adev)
129 {
130 	uint8_t __iomem *bios;
131 	size_t size;
132 
133 	adev->bios = NULL;
134 	/* XXX: some cards may return 0 for rom size? ddx has a workaround */
135 	bios = pci_map_rom(adev->pdev, &size);
136 	if (!bios) {
137 		return false;
138 	}
139 
140 	adev->bios = kzalloc(size, GFP_KERNEL);
141 	if (adev->bios == NULL) {
142 		pci_unmap_rom(adev->pdev, bios);
143 		return false;
144 	}
145 	adev->bios_size = size;
146 	memcpy_fromio(adev->bios, bios, size);
147 	pci_unmap_rom(adev->pdev, bios);
148 
149 	if (!check_atom_bios(adev->bios, size)) {
150 		kfree(adev->bios);
151 		return false;
152 	}
153 
154 	return true;
155 }
156 
157 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
158 {
159 	u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
160 	int len;
161 
162 	if (!adev->asic_funcs || !adev->asic_funcs->read_bios_from_rom)
163 		return false;
164 
165 	/* validate VBIOS signature */
166 	if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
167 		return false;
168 	header[AMD_VBIOS_SIGNATURE_END] = 0;
169 
170 	if ((!AMD_IS_VALID_VBIOS(header)) ||
171 	    0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
172 			AMD_VBIOS_SIGNATURE,
173 			strlen(AMD_VBIOS_SIGNATURE)))
174 		return false;
175 
176 	/* valid vbios, go on */
177 	len = AMD_VBIOS_LENGTH(header);
178 	len = ALIGN(len, 4);
179 	adev->bios = kmalloc(len, GFP_KERNEL);
180 	if (!adev->bios) {
181 		DRM_ERROR("no memory to allocate for BIOS\n");
182 		return false;
183 	}
184 	adev->bios_size = len;
185 
186 	/* read complete BIOS */
187 	amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
188 
189 	if (!check_atom_bios(adev->bios, len)) {
190 		kfree(adev->bios);
191 		return false;
192 	}
193 
194 	return true;
195 }
196 
197 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
198 {
199 	phys_addr_t rom = adev->pdev->rom;
200 	size_t romlen = adev->pdev->romlen;
201 	void __iomem *bios;
202 
203 	adev->bios = NULL;
204 
205 	if (!rom || romlen == 0)
206 		return false;
207 
208 	adev->bios = kzalloc(romlen, GFP_KERNEL);
209 	if (!adev->bios)
210 		return false;
211 
212 	bios = ioremap(rom, romlen);
213 	if (!bios)
214 		goto free_bios;
215 
216 	memcpy_fromio(adev->bios, bios, romlen);
217 	iounmap(bios);
218 
219 	if (!check_atom_bios(adev->bios, romlen))
220 		goto free_bios;
221 
222 	adev->bios_size = romlen;
223 
224 	return true;
225 free_bios:
226 	kfree(adev->bios);
227 	return false;
228 }
229 
230 #ifdef CONFIG_ACPI
231 /* ATRM is used to get the BIOS on the discrete cards in
232  * dual-gpu systems.
233  */
234 /* retrieve the ROM in 4k blocks */
235 #define ATRM_BIOS_PAGE 4096
236 /**
237  * amdgpu_atrm_call - fetch a chunk of the vbios
238  *
239  * @atrm_handle: acpi ATRM handle
240  * @bios: vbios image pointer
241  * @offset: offset of vbios image data to fetch
242  * @len: length of vbios image data to fetch
243  *
244  * Executes ATRM to fetch a chunk of the discrete
245  * vbios image on PX systems (all asics).
246  * Returns the length of the buffer fetched.
247  */
248 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
249 			    int offset, int len)
250 {
251 	acpi_status status;
252 	union acpi_object atrm_arg_elements[2], *obj;
253 	struct acpi_object_list atrm_arg;
254 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
255 
256 	atrm_arg.count = 2;
257 	atrm_arg.pointer = &atrm_arg_elements[0];
258 
259 	atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
260 	atrm_arg_elements[0].integer.value = offset;
261 
262 	atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
263 	atrm_arg_elements[1].integer.value = len;
264 
265 	status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
266 	if (ACPI_FAILURE(status)) {
267 		printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
268 		return -ENODEV;
269 	}
270 
271 	obj = (union acpi_object *)buffer.pointer;
272 	memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
273 	len = obj->buffer.length;
274 	kfree(buffer.pointer);
275 	return len;
276 }
277 
278 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
279 {
280 	int ret;
281 	int size = 256 * 1024;
282 	int i;
283 	struct pci_dev *pdev = NULL;
284 	acpi_handle dhandle, atrm_handle;
285 	acpi_status status;
286 	bool found = false;
287 
288 	/* ATRM is for the discrete card only */
289 	if (adev->flags & AMD_IS_APU)
290 		return false;
291 
292 	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
293 		dhandle = ACPI_HANDLE(&pdev->dev);
294 		if (!dhandle)
295 			continue;
296 
297 		status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
298 		if (ACPI_SUCCESS(status)) {
299 			found = true;
300 			break;
301 		}
302 	}
303 
304 	if (!found) {
305 		while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
306 			dhandle = ACPI_HANDLE(&pdev->dev);
307 			if (!dhandle)
308 				continue;
309 
310 			status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
311 			if (ACPI_SUCCESS(status)) {
312 				found = true;
313 				break;
314 			}
315 		}
316 	}
317 
318 	if (!found)
319 		return false;
320 
321 	adev->bios = kmalloc(size, GFP_KERNEL);
322 	if (!adev->bios) {
323 		dev_err(adev->dev, "Unable to allocate bios\n");
324 		return false;
325 	}
326 
327 	for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
328 		ret = amdgpu_atrm_call(atrm_handle,
329 				       adev->bios,
330 				       (i * ATRM_BIOS_PAGE),
331 				       ATRM_BIOS_PAGE);
332 		if (ret < ATRM_BIOS_PAGE)
333 			break;
334 	}
335 
336 	if (!check_atom_bios(adev->bios, size)) {
337 		kfree(adev->bios);
338 		return false;
339 	}
340 	adev->bios_size = size;
341 	return true;
342 }
343 #else
344 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
345 {
346 	return false;
347 }
348 #endif
349 
350 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
351 {
352 	if (adev->flags & AMD_IS_APU)
353 		return igp_read_bios_from_vram(adev);
354 	else
355 		return (!adev->asic_funcs || !adev->asic_funcs->read_disabled_bios) ?
356 			false : amdgpu_asic_read_disabled_bios(adev);
357 }
358 
359 #ifdef CONFIG_ACPI
360 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
361 {
362 	struct acpi_table_header *hdr;
363 	acpi_size tbl_size;
364 	UEFI_ACPI_VFCT *vfct;
365 	unsigned offset;
366 
367 	if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
368 		return false;
369 	tbl_size = hdr->length;
370 	if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
371 		dev_info(adev->dev, "ACPI VFCT table present but broken (too short #1),skipping\n");
372 		return false;
373 	}
374 
375 	vfct = (UEFI_ACPI_VFCT *)hdr;
376 	offset = vfct->VBIOSImageOffset;
377 
378 	while (offset < tbl_size) {
379 		GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);
380 		VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader;
381 
382 		offset += sizeof(VFCT_IMAGE_HEADER);
383 		if (offset > tbl_size) {
384 			dev_info(adev->dev, "ACPI VFCT image header truncated,skipping\n");
385 			return false;
386 		}
387 
388 		offset += vhdr->ImageLength;
389 		if (offset > tbl_size) {
390 			dev_info(adev->dev, "ACPI VFCT image truncated,skipping\n");
391 			return false;
392 		}
393 
394 		if (vhdr->ImageLength &&
395 		    vhdr->PCIBus == adev->pdev->bus->number &&
396 		    vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) &&
397 		    vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) &&
398 		    vhdr->VendorID == adev->pdev->vendor &&
399 		    vhdr->DeviceID == adev->pdev->device) {
400 			adev->bios = kmemdup(&vbios->VbiosContent,
401 					     vhdr->ImageLength,
402 					     GFP_KERNEL);
403 
404 			if (!check_atom_bios(adev->bios, vhdr->ImageLength)) {
405 				kfree(adev->bios);
406 				return false;
407 			}
408 			adev->bios_size = vhdr->ImageLength;
409 			return true;
410 		}
411 	}
412 
413 	dev_info(adev->dev, "ACPI VFCT table present but broken (too short #2),skipping\n");
414 	return false;
415 }
416 #else
417 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
418 {
419 	return false;
420 }
421 #endif
422 
423 bool amdgpu_get_bios(struct amdgpu_device *adev)
424 {
425 	if (amdgpu_atrm_get_bios(adev)) {
426 		dev_info(adev->dev, "Fetched VBIOS from ATRM\n");
427 		goto success;
428 	}
429 
430 	if (amdgpu_acpi_vfct_bios(adev)) {
431 		dev_info(adev->dev, "Fetched VBIOS from VFCT\n");
432 		goto success;
433 	}
434 
435 	if (igp_read_bios_from_vram(adev)) {
436 		dev_info(adev->dev, "Fetched VBIOS from VRAM BAR\n");
437 		goto success;
438 	}
439 
440 	if (amdgpu_read_bios(adev)) {
441 		dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");
442 		goto success;
443 	}
444 
445 	if (amdgpu_read_bios_from_rom(adev)) {
446 		dev_info(adev->dev, "Fetched VBIOS from ROM\n");
447 		goto success;
448 	}
449 
450 	if (amdgpu_read_disabled_bios(adev)) {
451 		dev_info(adev->dev, "Fetched VBIOS from disabled ROM BAR\n");
452 		goto success;
453 	}
454 
455 	if (amdgpu_read_platform_bios(adev)) {
456 		dev_info(adev->dev, "Fetched VBIOS from platform\n");
457 		goto success;
458 	}
459 
460 	dev_err(adev->dev, "Unable to locate a BIOS ROM\n");
461 	return false;
462 
463 success:
464 	adev->is_atom_fw = (adev->asic_type >= CHIP_VEGA10) ? true : false;
465 	return true;
466 }
467