1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright(c) 2019-2022, Intel Corporation. All rights reserved.
4 */
5
6 #include <linux/irq.h>
7 #include <linux/mei_aux.h>
8 #include "i915_drv.h"
9 #include "i915_reg.h"
10 #include "gem/i915_gem_region.h"
11 #include "gt/intel_gsc.h"
12 #include "gt/intel_gt.h"
13
14 #define GSC_BAR_LENGTH 0x00000FFC
15
gsc_irq_mask(struct irq_data * d)16 static void gsc_irq_mask(struct irq_data *d)
17 {
18 /* generic irq handling */
19 }
20
gsc_irq_unmask(struct irq_data * d)21 static void gsc_irq_unmask(struct irq_data *d)
22 {
23 /* generic irq handling */
24 }
25
26 static struct irq_chip gsc_irq_chip = {
27 .name = "gsc_irq_chip",
28 .irq_mask = gsc_irq_mask,
29 .irq_unmask = gsc_irq_unmask,
30 };
31
gsc_irq_init(int irq)32 static int gsc_irq_init(int irq)
33 {
34 irq_set_chip_and_handler_name(irq, &gsc_irq_chip,
35 handle_simple_irq, "gsc_irq_handler");
36
37 return irq_set_chip_data(irq, NULL);
38 }
39
40 static int
gsc_ext_om_alloc(struct intel_gsc * gsc,struct intel_gsc_intf * intf,size_t size)41 gsc_ext_om_alloc(struct intel_gsc *gsc, struct intel_gsc_intf *intf, size_t size)
42 {
43 struct intel_gt *gt = gsc_to_gt(gsc);
44 struct drm_i915_gem_object *obj;
45 int err;
46
47 obj = i915_gem_object_create_lmem(gt->i915, size,
48 I915_BO_ALLOC_CONTIGUOUS |
49 I915_BO_ALLOC_CPU_CLEAR);
50 if (IS_ERR(obj)) {
51 drm_err(>->i915->drm, "Failed to allocate gsc memory\n");
52 return PTR_ERR(obj);
53 }
54
55 err = i915_gem_object_pin_pages_unlocked(obj);
56 if (err) {
57 drm_err(>->i915->drm, "Failed to pin pages for gsc memory\n");
58 goto out_put;
59 }
60
61 intf->gem_obj = obj;
62
63 return 0;
64
65 out_put:
66 i915_gem_object_put(obj);
67 return err;
68 }
69
gsc_ext_om_destroy(struct intel_gsc_intf * intf)70 static void gsc_ext_om_destroy(struct intel_gsc_intf *intf)
71 {
72 struct drm_i915_gem_object *obj = fetch_and_zero(&intf->gem_obj);
73
74 if (!obj)
75 return;
76
77 if (i915_gem_object_has_pinned_pages(obj))
78 i915_gem_object_unpin_pages(obj);
79
80 i915_gem_object_put(obj);
81 }
82
83 struct gsc_def {
84 const char *name;
85 unsigned long bar;
86 size_t bar_size;
87 bool use_polling;
88 bool slow_firmware;
89 size_t lmem_size;
90 };
91
92 /* gsc resources and definitions (HECI1 and HECI2) */
93 static const struct gsc_def gsc_def_dg1[] = {
94 {
95 /* HECI1 not yet implemented. */
96 },
97 {
98 .name = "mei-gscfi",
99 .bar = DG1_GSC_HECI2_BASE,
100 .bar_size = GSC_BAR_LENGTH,
101 }
102 };
103
104 static const struct gsc_def gsc_def_xehpsdv[] = {
105 {
106 /* HECI1 not enabled on the device. */
107 },
108 {
109 .name = "mei-gscfi",
110 .bar = DG1_GSC_HECI2_BASE,
111 .bar_size = GSC_BAR_LENGTH,
112 .use_polling = true,
113 .slow_firmware = true,
114 }
115 };
116
117 static const struct gsc_def gsc_def_dg2[] = {
118 {
119 .name = "mei-gsc",
120 .bar = DG2_GSC_HECI1_BASE,
121 .bar_size = GSC_BAR_LENGTH,
122 .lmem_size = SZ_4M,
123 },
124 {
125 .name = "mei-gscfi",
126 .bar = DG2_GSC_HECI2_BASE,
127 .bar_size = GSC_BAR_LENGTH,
128 }
129 };
130
gsc_release_dev(struct device * dev)131 static void gsc_release_dev(struct device *dev)
132 {
133 struct auxiliary_device *aux_dev = to_auxiliary_dev(dev);
134 struct mei_aux_device *adev = auxiliary_dev_to_mei_aux_dev(aux_dev);
135
136 kfree(adev);
137 }
138
gsc_destroy_one(struct drm_i915_private * i915,struct intel_gsc * gsc,unsigned int intf_id)139 static void gsc_destroy_one(struct drm_i915_private *i915,
140 struct intel_gsc *gsc, unsigned int intf_id)
141 {
142 struct intel_gsc_intf *intf = &gsc->intf[intf_id];
143
144 if (intf->adev) {
145 auxiliary_device_delete(&intf->adev->aux_dev);
146 auxiliary_device_uninit(&intf->adev->aux_dev);
147 intf->adev = NULL;
148 }
149
150 if (intf->irq >= 0)
151 irq_free_desc(intf->irq);
152 intf->irq = -1;
153
154 gsc_ext_om_destroy(intf);
155 }
156
gsc_init_one(struct drm_i915_private * i915,struct intel_gsc * gsc,unsigned int intf_id)157 static void gsc_init_one(struct drm_i915_private *i915, struct intel_gsc *gsc,
158 unsigned int intf_id)
159 {
160 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
161 struct mei_aux_device *adev;
162 struct auxiliary_device *aux_dev;
163 const struct gsc_def *def;
164 struct intel_gsc_intf *intf = &gsc->intf[intf_id];
165 int ret;
166
167 intf->irq = -1;
168 intf->id = intf_id;
169
170 if (intf_id == 0 && !HAS_HECI_PXP(i915))
171 return;
172
173 if (IS_DG1(i915)) {
174 def = &gsc_def_dg1[intf_id];
175 } else if (IS_XEHPSDV(i915)) {
176 def = &gsc_def_xehpsdv[intf_id];
177 } else if (IS_DG2(i915)) {
178 def = &gsc_def_dg2[intf_id];
179 } else {
180 drm_warn_once(&i915->drm, "Unknown platform\n");
181 return;
182 }
183
184 if (!def->name) {
185 drm_warn_once(&i915->drm, "HECI%d is not implemented!\n", intf_id + 1);
186 return;
187 }
188
189 /* skip irq initialization */
190 if (def->use_polling)
191 goto add_device;
192
193 intf->irq = irq_alloc_desc(0);
194 if (intf->irq < 0) {
195 drm_err(&i915->drm, "gsc irq error %d\n", intf->irq);
196 goto fail;
197 }
198
199 ret = gsc_irq_init(intf->irq);
200 if (ret < 0) {
201 drm_err(&i915->drm, "gsc irq init failed %d\n", ret);
202 goto fail;
203 }
204
205 add_device:
206 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
207 if (!adev)
208 goto fail;
209
210 if (def->lmem_size) {
211 drm_dbg(&i915->drm, "setting up GSC lmem\n");
212
213 if (gsc_ext_om_alloc(gsc, intf, def->lmem_size)) {
214 drm_err(&i915->drm, "setting up gsc extended operational memory failed\n");
215 kfree(adev);
216 goto fail;
217 }
218
219 adev->ext_op_mem.start = i915_gem_object_get_dma_address(intf->gem_obj, 0);
220 adev->ext_op_mem.end = adev->ext_op_mem.start + def->lmem_size;
221 }
222
223 adev->irq = intf->irq;
224 adev->bar.parent = &pdev->resource[0];
225 adev->bar.start = def->bar + pdev->resource[0].start;
226 adev->bar.end = adev->bar.start + def->bar_size - 1;
227 adev->bar.flags = IORESOURCE_MEM;
228 adev->bar.desc = IORES_DESC_NONE;
229 adev->slow_firmware = def->slow_firmware;
230
231 aux_dev = &adev->aux_dev;
232 aux_dev->name = def->name;
233 aux_dev->id = (pci_domain_nr(pdev->bus) << 16) |
234 PCI_DEVID(pdev->bus->number, pdev->devfn);
235 aux_dev->dev.parent = &pdev->dev;
236 aux_dev->dev.release = gsc_release_dev;
237
238 ret = auxiliary_device_init(aux_dev);
239 if (ret < 0) {
240 drm_err(&i915->drm, "gsc aux init failed %d\n", ret);
241 kfree(adev);
242 goto fail;
243 }
244
245 ret = auxiliary_device_add(aux_dev);
246 if (ret < 0) {
247 drm_err(&i915->drm, "gsc aux add failed %d\n", ret);
248 /* adev will be freed with the put_device() and .release sequence */
249 auxiliary_device_uninit(aux_dev);
250 goto fail;
251 }
252 intf->adev = adev;
253
254 return;
255 fail:
256 gsc_destroy_one(i915, gsc, intf->id);
257 }
258
gsc_irq_handler(struct intel_gt * gt,unsigned int intf_id)259 static void gsc_irq_handler(struct intel_gt *gt, unsigned int intf_id)
260 {
261 int ret;
262
263 if (intf_id >= INTEL_GSC_NUM_INTERFACES) {
264 drm_warn_once(>->i915->drm, "GSC irq: intf_id %d is out of range", intf_id);
265 return;
266 }
267
268 if (!HAS_HECI_GSC(gt->i915)) {
269 drm_warn_once(>->i915->drm, "GSC irq: not supported");
270 return;
271 }
272
273 if (gt->gsc.intf[intf_id].irq < 0)
274 return;
275
276 ret = generic_handle_irq(gt->gsc.intf[intf_id].irq);
277 if (ret)
278 drm_err_ratelimited(>->i915->drm, "error handling GSC irq: %d\n", ret);
279 }
280
intel_gsc_irq_handler(struct intel_gt * gt,u32 iir)281 void intel_gsc_irq_handler(struct intel_gt *gt, u32 iir)
282 {
283 if (iir & GSC_IRQ_INTF(0))
284 gsc_irq_handler(gt, 0);
285 if (iir & GSC_IRQ_INTF(1))
286 gsc_irq_handler(gt, 1);
287 }
288
intel_gsc_init(struct intel_gsc * gsc,struct drm_i915_private * i915)289 void intel_gsc_init(struct intel_gsc *gsc, struct drm_i915_private *i915)
290 {
291 unsigned int i;
292
293 if (!HAS_HECI_GSC(i915))
294 return;
295
296 for (i = 0; i < INTEL_GSC_NUM_INTERFACES; i++)
297 gsc_init_one(i915, gsc, i);
298 }
299
intel_gsc_fini(struct intel_gsc * gsc)300 void intel_gsc_fini(struct intel_gsc *gsc)
301 {
302 struct intel_gt *gt = gsc_to_gt(gsc);
303 unsigned int i;
304
305 if (!HAS_HECI_GSC(gt->i915))
306 return;
307
308 for (i = 0; i < INTEL_GSC_NUM_INTERFACES; i++)
309 gsc_destroy_one(gt->i915, gsc, i);
310 }
311