1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright (C) 2013 Freescale Semiconductor, Inc.
5 * Author: Varun Sethi <varun.sethi@freescale.com>
6 */
7
8 #define pr_fmt(fmt) "fsl-pamu-domain: %s: " fmt, __func__
9
10 #include "fsl_pamu_domain.h"
11
12 #include <linux/platform_device.h>
13 #include <sysdev/fsl_pci.h>
14
15 /*
16 * Global spinlock that needs to be held while
17 * configuring PAMU.
18 */
19 static DEFINE_SPINLOCK(iommu_lock);
20
21 static struct kmem_cache *fsl_pamu_domain_cache;
22 static struct kmem_cache *iommu_devinfo_cache;
23 static DEFINE_SPINLOCK(device_domain_lock);
24
25 struct iommu_device pamu_iommu; /* IOMMU core code handle */
26
to_fsl_dma_domain(struct iommu_domain * dom)27 static struct fsl_dma_domain *to_fsl_dma_domain(struct iommu_domain *dom)
28 {
29 return container_of(dom, struct fsl_dma_domain, iommu_domain);
30 }
31
iommu_init_mempool(void)32 static int __init iommu_init_mempool(void)
33 {
34 fsl_pamu_domain_cache = kmem_cache_create("fsl_pamu_domain",
35 sizeof(struct fsl_dma_domain),
36 0,
37 SLAB_HWCACHE_ALIGN,
38 NULL);
39 if (!fsl_pamu_domain_cache) {
40 pr_debug("Couldn't create fsl iommu_domain cache\n");
41 return -ENOMEM;
42 }
43
44 iommu_devinfo_cache = kmem_cache_create("iommu_devinfo",
45 sizeof(struct device_domain_info),
46 0,
47 SLAB_HWCACHE_ALIGN,
48 NULL);
49 if (!iommu_devinfo_cache) {
50 pr_debug("Couldn't create devinfo cache\n");
51 kmem_cache_destroy(fsl_pamu_domain_cache);
52 return -ENOMEM;
53 }
54
55 return 0;
56 }
57
update_liodn_stash(int liodn,struct fsl_dma_domain * dma_domain,u32 val)58 static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain,
59 u32 val)
60 {
61 int ret = 0;
62 unsigned long flags;
63
64 spin_lock_irqsave(&iommu_lock, flags);
65 ret = pamu_update_paace_stash(liodn, val);
66 if (ret) {
67 pr_debug("Failed to update SPAACE for liodn %d\n ", liodn);
68 spin_unlock_irqrestore(&iommu_lock, flags);
69 return ret;
70 }
71
72 spin_unlock_irqrestore(&iommu_lock, flags);
73
74 return ret;
75 }
76
77 /* Set the geometry parameters for a LIODN */
pamu_set_liodn(struct fsl_dma_domain * dma_domain,struct device * dev,int liodn)78 static int pamu_set_liodn(struct fsl_dma_domain *dma_domain, struct device *dev,
79 int liodn)
80 {
81 u32 omi_index = ~(u32)0;
82 unsigned long flags;
83 int ret;
84
85 /*
86 * Configure the omi_index at the geometry setup time.
87 * This is a static value which depends on the type of
88 * device and would not change thereafter.
89 */
90 get_ome_index(&omi_index, dev);
91
92 spin_lock_irqsave(&iommu_lock, flags);
93 ret = pamu_disable_liodn(liodn);
94 if (ret)
95 goto out_unlock;
96 ret = pamu_config_ppaace(liodn, omi_index, dma_domain->stash_id, 0);
97 if (ret)
98 goto out_unlock;
99 ret = pamu_config_ppaace(liodn, ~(u32)0, dma_domain->stash_id,
100 PAACE_AP_PERMS_QUERY | PAACE_AP_PERMS_UPDATE);
101 out_unlock:
102 spin_unlock_irqrestore(&iommu_lock, flags);
103 if (ret) {
104 pr_debug("PAACE configuration failed for liodn %d\n",
105 liodn);
106 }
107 return ret;
108 }
109
remove_device_ref(struct device_domain_info * info)110 static void remove_device_ref(struct device_domain_info *info)
111 {
112 unsigned long flags;
113
114 list_del(&info->link);
115 spin_lock_irqsave(&iommu_lock, flags);
116 pamu_disable_liodn(info->liodn);
117 spin_unlock_irqrestore(&iommu_lock, flags);
118 spin_lock_irqsave(&device_domain_lock, flags);
119 dev_iommu_priv_set(info->dev, NULL);
120 kmem_cache_free(iommu_devinfo_cache, info);
121 spin_unlock_irqrestore(&device_domain_lock, flags);
122 }
123
detach_device(struct device * dev,struct fsl_dma_domain * dma_domain)124 static void detach_device(struct device *dev, struct fsl_dma_domain *dma_domain)
125 {
126 struct device_domain_info *info, *tmp;
127 unsigned long flags;
128
129 spin_lock_irqsave(&dma_domain->domain_lock, flags);
130 /* Remove the device from the domain device list */
131 list_for_each_entry_safe(info, tmp, &dma_domain->devices, link) {
132 if (!dev || (info->dev == dev))
133 remove_device_ref(info);
134 }
135 spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
136 }
137
attach_device(struct fsl_dma_domain * dma_domain,int liodn,struct device * dev)138 static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct device *dev)
139 {
140 struct device_domain_info *info, *old_domain_info;
141 unsigned long flags;
142
143 spin_lock_irqsave(&device_domain_lock, flags);
144 /*
145 * Check here if the device is already attached to domain or not.
146 * If the device is already attached to a domain detach it.
147 */
148 old_domain_info = dev_iommu_priv_get(dev);
149 if (old_domain_info && old_domain_info->domain != dma_domain) {
150 spin_unlock_irqrestore(&device_domain_lock, flags);
151 detach_device(dev, old_domain_info->domain);
152 spin_lock_irqsave(&device_domain_lock, flags);
153 }
154
155 info = kmem_cache_zalloc(iommu_devinfo_cache, GFP_ATOMIC);
156
157 info->dev = dev;
158 info->liodn = liodn;
159 info->domain = dma_domain;
160
161 list_add(&info->link, &dma_domain->devices);
162 /*
163 * In case of devices with multiple LIODNs just store
164 * the info for the first LIODN as all
165 * LIODNs share the same domain
166 */
167 if (!dev_iommu_priv_get(dev))
168 dev_iommu_priv_set(dev, info);
169 spin_unlock_irqrestore(&device_domain_lock, flags);
170 }
171
fsl_pamu_iova_to_phys(struct iommu_domain * domain,dma_addr_t iova)172 static phys_addr_t fsl_pamu_iova_to_phys(struct iommu_domain *domain,
173 dma_addr_t iova)
174 {
175 if (iova < domain->geometry.aperture_start ||
176 iova > domain->geometry.aperture_end)
177 return 0;
178 return iova;
179 }
180
fsl_pamu_capable(struct device * dev,enum iommu_cap cap)181 static bool fsl_pamu_capable(struct device *dev, enum iommu_cap cap)
182 {
183 return cap == IOMMU_CAP_CACHE_COHERENCY;
184 }
185
fsl_pamu_domain_free(struct iommu_domain * domain)186 static void fsl_pamu_domain_free(struct iommu_domain *domain)
187 {
188 struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
189
190 /* remove all the devices from the device list */
191 detach_device(NULL, dma_domain);
192 kmem_cache_free(fsl_pamu_domain_cache, dma_domain);
193 }
194
fsl_pamu_domain_alloc(unsigned type)195 static struct iommu_domain *fsl_pamu_domain_alloc(unsigned type)
196 {
197 struct fsl_dma_domain *dma_domain;
198
199 if (type != IOMMU_DOMAIN_UNMANAGED)
200 return NULL;
201
202 dma_domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL);
203 if (!dma_domain)
204 return NULL;
205
206 dma_domain->stash_id = ~(u32)0;
207 INIT_LIST_HEAD(&dma_domain->devices);
208 spin_lock_init(&dma_domain->domain_lock);
209
210 /* default geometry 64 GB i.e. maximum system address */
211 dma_domain->iommu_domain. geometry.aperture_start = 0;
212 dma_domain->iommu_domain.geometry.aperture_end = (1ULL << 36) - 1;
213 dma_domain->iommu_domain.geometry.force_aperture = true;
214
215 return &dma_domain->iommu_domain;
216 }
217
218 /* Update stash destination for all LIODNs associated with the domain */
update_domain_stash(struct fsl_dma_domain * dma_domain,u32 val)219 static int update_domain_stash(struct fsl_dma_domain *dma_domain, u32 val)
220 {
221 struct device_domain_info *info;
222 int ret = 0;
223
224 list_for_each_entry(info, &dma_domain->devices, link) {
225 ret = update_liodn_stash(info->liodn, dma_domain, val);
226 if (ret)
227 break;
228 }
229
230 return ret;
231 }
232
fsl_pamu_attach_device(struct iommu_domain * domain,struct device * dev)233 static int fsl_pamu_attach_device(struct iommu_domain *domain,
234 struct device *dev)
235 {
236 struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
237 unsigned long flags;
238 int len, ret = 0, i;
239 const u32 *liodn;
240 struct pci_dev *pdev = NULL;
241 struct pci_controller *pci_ctl;
242
243 /*
244 * Use LIODN of the PCI controller while attaching a
245 * PCI device.
246 */
247 if (dev_is_pci(dev)) {
248 pdev = to_pci_dev(dev);
249 pci_ctl = pci_bus_to_host(pdev->bus);
250 /*
251 * make dev point to pci controller device
252 * so we can get the LIODN programmed by
253 * u-boot.
254 */
255 dev = pci_ctl->parent;
256 }
257
258 liodn = of_get_property(dev->of_node, "fsl,liodn", &len);
259 if (!liodn) {
260 pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node);
261 return -EINVAL;
262 }
263
264 spin_lock_irqsave(&dma_domain->domain_lock, flags);
265 for (i = 0; i < len / sizeof(u32); i++) {
266 /* Ensure that LIODN value is valid */
267 if (liodn[i] >= PAACE_NUMBER_ENTRIES) {
268 pr_debug("Invalid liodn %d, attach device failed for %pOF\n",
269 liodn[i], dev->of_node);
270 ret = -EINVAL;
271 break;
272 }
273
274 attach_device(dma_domain, liodn[i], dev);
275 ret = pamu_set_liodn(dma_domain, dev, liodn[i]);
276 if (ret)
277 break;
278 ret = pamu_enable_liodn(liodn[i]);
279 if (ret)
280 break;
281 }
282 spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
283 return ret;
284 }
285
fsl_pamu_detach_device(struct iommu_domain * domain,struct device * dev)286 static void fsl_pamu_detach_device(struct iommu_domain *domain,
287 struct device *dev)
288 {
289 struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
290 const u32 *prop;
291 int len;
292 struct pci_dev *pdev = NULL;
293 struct pci_controller *pci_ctl;
294
295 /*
296 * Use LIODN of the PCI controller while detaching a
297 * PCI device.
298 */
299 if (dev_is_pci(dev)) {
300 pdev = to_pci_dev(dev);
301 pci_ctl = pci_bus_to_host(pdev->bus);
302 /*
303 * make dev point to pci controller device
304 * so we can get the LIODN programmed by
305 * u-boot.
306 */
307 dev = pci_ctl->parent;
308 }
309
310 prop = of_get_property(dev->of_node, "fsl,liodn", &len);
311 if (prop)
312 detach_device(dev, dma_domain);
313 else
314 pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node);
315 }
316
317 /* Set the domain stash attribute */
fsl_pamu_configure_l1_stash(struct iommu_domain * domain,u32 cpu)318 int fsl_pamu_configure_l1_stash(struct iommu_domain *domain, u32 cpu)
319 {
320 struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
321 unsigned long flags;
322 int ret;
323
324 spin_lock_irqsave(&dma_domain->domain_lock, flags);
325 dma_domain->stash_id = get_stash_id(PAMU_ATTR_CACHE_L1, cpu);
326 if (dma_domain->stash_id == ~(u32)0) {
327 pr_debug("Invalid stash attributes\n");
328 spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
329 return -EINVAL;
330 }
331 ret = update_domain_stash(dma_domain, dma_domain->stash_id);
332 spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
333
334 return ret;
335 }
336
get_device_iommu_group(struct device * dev)337 static struct iommu_group *get_device_iommu_group(struct device *dev)
338 {
339 struct iommu_group *group;
340
341 group = iommu_group_get(dev);
342 if (!group)
343 group = iommu_group_alloc();
344
345 return group;
346 }
347
check_pci_ctl_endpt_part(struct pci_controller * pci_ctl)348 static bool check_pci_ctl_endpt_part(struct pci_controller *pci_ctl)
349 {
350 u32 version;
351
352 /* Check the PCI controller version number by readding BRR1 register */
353 version = in_be32(pci_ctl->cfg_addr + (PCI_FSL_BRR1 >> 2));
354 version &= PCI_FSL_BRR1_VER;
355 /* If PCI controller version is >= 0x204 we can partition endpoints */
356 return version >= 0x204;
357 }
358
359 /* Get iommu group information from peer devices or devices on the parent bus */
get_shared_pci_device_group(struct pci_dev * pdev)360 static struct iommu_group *get_shared_pci_device_group(struct pci_dev *pdev)
361 {
362 struct pci_dev *tmp;
363 struct iommu_group *group;
364 struct pci_bus *bus = pdev->bus;
365
366 /*
367 * Traverese the pci bus device list to get
368 * the shared iommu group.
369 */
370 while (bus) {
371 list_for_each_entry(tmp, &bus->devices, bus_list) {
372 if (tmp == pdev)
373 continue;
374 group = iommu_group_get(&tmp->dev);
375 if (group)
376 return group;
377 }
378
379 bus = bus->parent;
380 }
381
382 return NULL;
383 }
384
get_pci_device_group(struct pci_dev * pdev)385 static struct iommu_group *get_pci_device_group(struct pci_dev *pdev)
386 {
387 struct pci_controller *pci_ctl;
388 bool pci_endpt_partitioning;
389 struct iommu_group *group = NULL;
390
391 pci_ctl = pci_bus_to_host(pdev->bus);
392 pci_endpt_partitioning = check_pci_ctl_endpt_part(pci_ctl);
393 /* We can partition PCIe devices so assign device group to the device */
394 if (pci_endpt_partitioning) {
395 group = pci_device_group(&pdev->dev);
396
397 /*
398 * PCIe controller is not a paritionable entity
399 * free the controller device iommu_group.
400 */
401 if (pci_ctl->parent->iommu_group)
402 iommu_group_remove_device(pci_ctl->parent);
403 } else {
404 /*
405 * All devices connected to the controller will share the
406 * PCI controllers device group. If this is the first
407 * device to be probed for the pci controller, copy the
408 * device group information from the PCI controller device
409 * node and remove the PCI controller iommu group.
410 * For subsequent devices, the iommu group information can
411 * be obtained from sibling devices (i.e. from the bus_devices
412 * link list).
413 */
414 if (pci_ctl->parent->iommu_group) {
415 group = get_device_iommu_group(pci_ctl->parent);
416 iommu_group_remove_device(pci_ctl->parent);
417 } else {
418 group = get_shared_pci_device_group(pdev);
419 }
420 }
421
422 if (!group)
423 group = ERR_PTR(-ENODEV);
424
425 return group;
426 }
427
fsl_pamu_device_group(struct device * dev)428 static struct iommu_group *fsl_pamu_device_group(struct device *dev)
429 {
430 struct iommu_group *group = ERR_PTR(-ENODEV);
431 int len;
432
433 /*
434 * For platform devices we allocate a separate group for
435 * each of the devices.
436 */
437 if (dev_is_pci(dev))
438 group = get_pci_device_group(to_pci_dev(dev));
439 else if (of_get_property(dev->of_node, "fsl,liodn", &len))
440 group = get_device_iommu_group(dev);
441
442 return group;
443 }
444
fsl_pamu_probe_device(struct device * dev)445 static struct iommu_device *fsl_pamu_probe_device(struct device *dev)
446 {
447 return &pamu_iommu;
448 }
449
450 static const struct iommu_ops fsl_pamu_ops = {
451 .capable = fsl_pamu_capable,
452 .domain_alloc = fsl_pamu_domain_alloc,
453 .probe_device = fsl_pamu_probe_device,
454 .device_group = fsl_pamu_device_group,
455 .default_domain_ops = &(const struct iommu_domain_ops) {
456 .attach_dev = fsl_pamu_attach_device,
457 .detach_dev = fsl_pamu_detach_device,
458 .iova_to_phys = fsl_pamu_iova_to_phys,
459 .free = fsl_pamu_domain_free,
460 }
461 };
462
pamu_domain_init(void)463 int __init pamu_domain_init(void)
464 {
465 int ret = 0;
466
467 ret = iommu_init_mempool();
468 if (ret)
469 return ret;
470
471 ret = iommu_device_sysfs_add(&pamu_iommu, NULL, NULL, "iommu0");
472 if (ret)
473 return ret;
474
475 ret = iommu_device_register(&pamu_iommu, &fsl_pamu_ops, NULL);
476 if (ret) {
477 iommu_device_sysfs_remove(&pamu_iommu);
478 pr_err("Can't register iommu device\n");
479 }
480
481 return ret;
482 }
483