1 /*
2  * Copyright 2019 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  */
23 #include <linux/pci.h>
24 
25 #include "amdgpu.h"
26 #include "amdgpu_i2c.h"
27 #include "smu_v11_0_i2c.h"
28 #include "atom.h"
29 #include "amdgpu_fru_eeprom.h"
30 #include "amdgpu_eeprom.h"
31 
32 #define FRU_EEPROM_MADDR_6      0x60000
33 #define FRU_EEPROM_MADDR_8      0x80000
34 
is_fru_eeprom_supported(struct amdgpu_device * adev,u32 * fru_addr)35 static bool is_fru_eeprom_supported(struct amdgpu_device *adev, u32 *fru_addr)
36 {
37 	/* Only server cards have the FRU EEPROM
38 	 * TODO: See if we can figure this out dynamically instead of
39 	 * having to parse VBIOS versions.
40 	 */
41 	struct atom_context *atom_ctx = adev->mode_info.atom_context;
42 
43 	/* The i2c access is blocked on VF
44 	 * TODO: Need other way to get the info
45 	 */
46 	if (amdgpu_sriov_vf(adev))
47 		return false;
48 
49 	/* The default I2C EEPROM address of the FRU.
50 	 */
51 	if (fru_addr)
52 		*fru_addr = FRU_EEPROM_MADDR_8;
53 
54 	/* VBIOS is of the format ###-DXXXYYYY-##. For SKU identification,
55 	 * we can use just the "DXXX" portion. If there were more models, we
56 	 * could convert the 3 characters to a hex integer and use a switch
57 	 * for ease/speed/readability. For now, 2 string comparisons are
58 	 * reasonable and not too expensive
59 	 */
60 	switch (adev->asic_type) {
61 	case CHIP_VEGA20:
62 		/* D161 and D163 are the VG20 server SKUs */
63 		if (strnstr(atom_ctx->vbios_pn, "D161",
64 			    sizeof(atom_ctx->vbios_pn)) ||
65 		    strnstr(atom_ctx->vbios_pn, "D163",
66 			    sizeof(atom_ctx->vbios_pn))) {
67 			if (fru_addr)
68 				*fru_addr = FRU_EEPROM_MADDR_6;
69 			return true;
70 		} else {
71 			return false;
72 		}
73 	case CHIP_ALDEBARAN:
74 		/* All Aldebaran SKUs have an FRU */
75 		if (!strnstr(atom_ctx->vbios_pn, "D673",
76 			     sizeof(atom_ctx->vbios_pn)))
77 			if (fru_addr)
78 				*fru_addr = FRU_EEPROM_MADDR_6;
79 		return true;
80 	case CHIP_SIENNA_CICHLID:
81 		if (strnstr(atom_ctx->vbios_pn, "D603",
82 			    sizeof(atom_ctx->vbios_pn))) {
83 			if (strnstr(atom_ctx->vbios_pn, "D603GLXE",
84 				    sizeof(atom_ctx->vbios_pn))) {
85 				return false;
86 			}
87 
88 			if (fru_addr)
89 				*fru_addr = FRU_EEPROM_MADDR_6;
90 			return true;
91 
92 		} else {
93 			return false;
94 		}
95 	default:
96 		return false;
97 	}
98 }
99 
amdgpu_fru_get_product_info(struct amdgpu_device * adev)100 int amdgpu_fru_get_product_info(struct amdgpu_device *adev)
101 {
102 	unsigned char buf[8], *pia;
103 	u32 addr, fru_addr;
104 	int size, len;
105 	u8 csum;
106 
107 	if (!is_fru_eeprom_supported(adev, &fru_addr))
108 		return 0;
109 
110 	/* If algo exists, it means that the i2c_adapter's initialized */
111 	if (!adev->pm.fru_eeprom_i2c_bus || !adev->pm.fru_eeprom_i2c_bus->algo) {
112 		DRM_WARN("Cannot access FRU, EEPROM accessor not initialized");
113 		return -ENODEV;
114 	}
115 
116 	/* Read the IPMI Common header */
117 	len = amdgpu_eeprom_read(adev->pm.fru_eeprom_i2c_bus, fru_addr, buf,
118 				 sizeof(buf));
119 	if (len != 8) {
120 		DRM_ERROR("Couldn't read the IPMI Common Header: %d", len);
121 		return len < 0 ? len : -EIO;
122 	}
123 
124 	if (buf[0] != 1) {
125 		DRM_ERROR("Bad IPMI Common Header version: 0x%02x", buf[0]);
126 		return -EIO;
127 	}
128 
129 	for (csum = 0; len > 0; len--)
130 		csum += buf[len - 1];
131 	if (csum) {
132 		DRM_ERROR("Bad IPMI Common Header checksum: 0x%02x", csum);
133 		return -EIO;
134 	}
135 
136 	/* Get the offset to the Product Info Area (PIA). */
137 	addr = buf[4] * 8;
138 	if (!addr)
139 		return 0;
140 
141 	/* Get the absolute address to the PIA. */
142 	addr += fru_addr;
143 
144 	/* Read the header of the PIA. */
145 	len = amdgpu_eeprom_read(adev->pm.fru_eeprom_i2c_bus, addr, buf, 3);
146 	if (len != 3) {
147 		DRM_ERROR("Couldn't read the Product Info Area header: %d", len);
148 		return len < 0 ? len : -EIO;
149 	}
150 
151 	if (buf[0] != 1) {
152 		DRM_ERROR("Bad IPMI Product Info Area version: 0x%02x", buf[0]);
153 		return -EIO;
154 	}
155 
156 	size = buf[1] * 8;
157 	pia = kzalloc(size, GFP_KERNEL);
158 	if (!pia)
159 		return -ENOMEM;
160 
161 	/* Read the whole PIA. */
162 	len = amdgpu_eeprom_read(adev->pm.fru_eeprom_i2c_bus, addr, pia, size);
163 	if (len != size) {
164 		kfree(pia);
165 		DRM_ERROR("Couldn't read the Product Info Area: %d", len);
166 		return len < 0 ? len : -EIO;
167 	}
168 
169 	for (csum = 0; size > 0; size--)
170 		csum += pia[size - 1];
171 	if (csum) {
172 		DRM_ERROR("Bad Product Info Area checksum: 0x%02x", csum);
173 		kfree(pia);
174 		return -EIO;
175 	}
176 
177 	/* Now extract useful information from the PIA.
178 	 *
179 	 * Skip the Manufacturer Name at [3] and go directly to
180 	 * the Product Name field.
181 	 */
182 	addr = 3 + 1 + (pia[3] & 0x3F);
183 	if (addr + 1 >= len)
184 		goto Out;
185 	memcpy(adev->product_name, pia + addr + 1,
186 	       min_t(size_t,
187 		     sizeof(adev->product_name),
188 		     pia[addr] & 0x3F));
189 	adev->product_name[sizeof(adev->product_name) - 1] = '\0';
190 
191 	/* Go to the Product Part/Model Number field. */
192 	addr += 1 + (pia[addr] & 0x3F);
193 	if (addr + 1 >= len)
194 		goto Out;
195 	memcpy(adev->product_number, pia + addr + 1,
196 	       min_t(size_t,
197 		     sizeof(adev->product_number),
198 		     pia[addr] & 0x3F));
199 	adev->product_number[sizeof(adev->product_number) - 1] = '\0';
200 
201 	/* Go to the Product Version field. */
202 	addr += 1 + (pia[addr] & 0x3F);
203 
204 	/* Go to the Product Serial Number field. */
205 	addr += 1 + (pia[addr] & 0x3F);
206 	if (addr + 1 >= len)
207 		goto Out;
208 	memcpy(adev->serial, pia + addr + 1, min_t(size_t,
209 						   sizeof(adev->serial),
210 						   pia[addr] & 0x3F));
211 	adev->serial[sizeof(adev->serial) - 1] = '\0';
212 Out:
213 	kfree(pia);
214 	return 0;
215 }
216 
217 /**
218  * DOC: product_name
219  *
220  * The amdgpu driver provides a sysfs API for reporting the product name
221  * for the device
222  * The file product_name is used for this and returns the product name
223  * as returned from the FRU.
224  * NOTE: This is only available for certain server cards
225  */
226 
amdgpu_fru_product_name_show(struct device * dev,struct device_attribute * attr,char * buf)227 static ssize_t amdgpu_fru_product_name_show(struct device *dev,
228 					    struct device_attribute *attr,
229 					    char *buf)
230 {
231 	struct drm_device *ddev = dev_get_drvdata(dev);
232 	struct amdgpu_device *adev = drm_to_adev(ddev);
233 
234 	return sysfs_emit(buf, "%s\n", adev->product_name);
235 }
236 
237 static DEVICE_ATTR(product_name, 0444, amdgpu_fru_product_name_show, NULL);
238 
239 /**
240  * DOC: product_number
241  *
242  * The amdgpu driver provides a sysfs API for reporting the part number
243  * for the device
244  * The file product_number is used for this and returns the part number
245  * as returned from the FRU.
246  * NOTE: This is only available for certain server cards
247  */
248 
amdgpu_fru_product_number_show(struct device * dev,struct device_attribute * attr,char * buf)249 static ssize_t amdgpu_fru_product_number_show(struct device *dev,
250 					      struct device_attribute *attr,
251 					      char *buf)
252 {
253 	struct drm_device *ddev = dev_get_drvdata(dev);
254 	struct amdgpu_device *adev = drm_to_adev(ddev);
255 
256 	return sysfs_emit(buf, "%s\n", adev->product_number);
257 }
258 
259 static DEVICE_ATTR(product_number, 0444, amdgpu_fru_product_number_show, NULL);
260 
261 /**
262  * DOC: serial_number
263  *
264  * The amdgpu driver provides a sysfs API for reporting the serial number
265  * for the device
266  * The file serial_number is used for this and returns the serial number
267  * as returned from the FRU.
268  * NOTE: This is only available for certain server cards
269  */
270 
amdgpu_fru_serial_number_show(struct device * dev,struct device_attribute * attr,char * buf)271 static ssize_t amdgpu_fru_serial_number_show(struct device *dev,
272 					     struct device_attribute *attr,
273 					     char *buf)
274 {
275 	struct drm_device *ddev = dev_get_drvdata(dev);
276 	struct amdgpu_device *adev = drm_to_adev(ddev);
277 
278 	return sysfs_emit(buf, "%s\n", adev->serial);
279 }
280 
281 static DEVICE_ATTR(serial_number, 0444, amdgpu_fru_serial_number_show, NULL);
282 
283 static const struct attribute *amdgpu_fru_attributes[] = {
284 	&dev_attr_product_name.attr,
285 	&dev_attr_product_number.attr,
286 	&dev_attr_serial_number.attr,
287 	NULL
288 };
289 
amdgpu_fru_sysfs_init(struct amdgpu_device * adev)290 int amdgpu_fru_sysfs_init(struct amdgpu_device *adev)
291 {
292 	if (!is_fru_eeprom_supported(adev, NULL))
293 		return 0;
294 
295 	return sysfs_create_files(&adev->dev->kobj, amdgpu_fru_attributes);
296 }
297 
amdgpu_fru_sysfs_fini(struct amdgpu_device * adev)298 void amdgpu_fru_sysfs_fini(struct amdgpu_device *adev)
299 {
300 	if (!is_fru_eeprom_supported(adev, NULL))
301 		return;
302 
303 	sysfs_remove_files(&adev->dev->kobj, amdgpu_fru_attributes);
304 }
305