1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8 #include <linux/device.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/uio_driver.h>
13 #include <linux/irq.h>
14 #include <linux/msi.h>
15 #include <linux/version.h>
16 #include <linux/slab.h>
18 #include <rte_pci_dev_features.h>
23 * A structure describing the private information for a uio device.
25 struct rte_uio_pci_dev {
28 enum rte_intr_mode mode;
33 static char *intr_mode;
34 static enum rte_intr_mode igbuio_intr_mode_preferred = RTE_INTR_MODE_MSIX;
37 show_max_vfs(struct device *dev, struct device_attribute *attr,
40 return snprintf(buf, 10, "%u\n", dev_num_vf(dev));
44 store_max_vfs(struct device *dev, struct device_attribute *attr,
45 const char *buf, size_t count)
48 unsigned long max_vfs;
49 struct pci_dev *pdev = to_pci_dev(dev);
51 if (0 != kstrtoul(buf, 0, &max_vfs))
55 pci_disable_sriov(pdev);
56 else if (0 == pci_num_vf(pdev))
57 err = pci_enable_sriov(pdev, max_vfs);
58 else /* do nothing if change max_vfs number */
61 return err ? err : count;
64 static DEVICE_ATTR(max_vfs, S_IRUGO | S_IWUSR, show_max_vfs, store_max_vfs);
66 static struct attribute *dev_attrs[] = {
67 &dev_attr_max_vfs.attr,
71 static const struct attribute_group dev_attr_grp = {
75 #ifndef HAVE_PCI_MSI_MASK_IRQ
77 * It masks the msix on/off of generating MSI-X messages.
80 igbuio_msix_mask_irq(struct msi_desc *desc, s32 state)
82 u32 mask_bits = desc->masked;
83 unsigned int offset = desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
84 PCI_MSIX_ENTRY_VECTOR_CTRL;
87 mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
89 mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
91 if (mask_bits != desc->masked) {
92 writel(mask_bits, desc->mask_base + offset);
93 readl(desc->mask_base);
94 desc->masked = mask_bits;
99 * It masks the msi on/off of generating MSI messages.
102 igbuio_msi_mask_irq(struct pci_dev *pdev, struct msi_desc *desc, int32_t state)
104 u32 mask_bits = desc->masked;
105 u32 offset = desc->irq - pdev->irq;
106 u32 mask = 1 << offset;
108 if (!desc->msi_attrib.maskbit)
116 if (mask_bits != desc->masked) {
117 pci_write_config_dword(pdev, desc->mask_pos, mask_bits);
118 desc->masked = mask_bits;
123 igbuio_mask_irq(struct pci_dev *pdev, enum rte_intr_mode mode, s32 irq_state)
125 struct msi_desc *desc;
126 struct list_head *msi_list;
128 #ifdef HAVE_MSI_LIST_IN_GENERIC_DEVICE
129 msi_list = &pdev->dev.msi_list;
131 msi_list = &pdev->msi_list;
134 if (mode == RTE_INTR_MODE_MSIX) {
135 list_for_each_entry(desc, msi_list, list)
136 igbuio_msix_mask_irq(desc, irq_state);
137 } else if (mode == RTE_INTR_MODE_MSI) {
138 list_for_each_entry(desc, msi_list, list)
139 igbuio_msi_mask_irq(pdev, desc, irq_state);
145 * This is the irqcontrol callback to be registered to uio_info.
146 * It can be used to disable/enable interrupt from user space processes.
149 * pointer to uio_info.
151 * state value. 1 to enable interrupt, 0 to disable interrupt.
155 * - On failure, a negative value.
158 igbuio_pci_irqcontrol(struct uio_info *info, s32 irq_state)
160 struct rte_uio_pci_dev *udev = info->priv;
161 struct pci_dev *pdev = udev->pdev;
163 #ifdef HAVE_PCI_MSI_MASK_IRQ
164 struct irq_data *irq = irq_get_irq_data(udev->info.irq);
167 pci_cfg_access_lock(pdev);
169 if (udev->mode == RTE_INTR_MODE_MSIX || udev->mode == RTE_INTR_MODE_MSI) {
170 #ifdef HAVE_PCI_MSI_MASK_IRQ
172 pci_msi_unmask_irq(irq);
174 pci_msi_mask_irq(irq);
176 igbuio_mask_irq(pdev, udev->mode, irq_state);
180 if (udev->mode == RTE_INTR_MODE_LEGACY)
181 pci_intx(pdev, !!irq_state);
183 pci_cfg_access_unlock(pdev);
189 * This is interrupt handler which will check if the interrupt is for the right device.
190 * If yes, disable it here and will be enable later.
193 igbuio_pci_irqhandler(int irq, void *dev_id)
195 struct rte_uio_pci_dev *udev = (struct rte_uio_pci_dev *)dev_id;
196 struct uio_info *info = &udev->info;
198 /* Legacy mode need to mask in hardware */
199 if (udev->mode == RTE_INTR_MODE_LEGACY &&
200 !pci_check_and_mask_intx(udev->pdev))
203 uio_event_notify(info);
205 /* Message signal mode, no share IRQ and automasked */
210 igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev)
213 #ifndef HAVE_ALLOC_IRQ_VECTORS
214 struct msix_entry msix_entry;
217 switch (igbuio_intr_mode_preferred) {
218 case RTE_INTR_MODE_MSIX:
219 /* Only 1 msi-x vector needed */
220 #ifndef HAVE_ALLOC_IRQ_VECTORS
221 msix_entry.entry = 0;
222 if (pci_enable_msix(udev->pdev, &msix_entry, 1) == 0) {
223 dev_dbg(&udev->pdev->dev, "using MSI-X");
224 udev->info.irq_flags = IRQF_NO_THREAD;
225 udev->info.irq = msix_entry.vector;
226 udev->mode = RTE_INTR_MODE_MSIX;
230 if (pci_alloc_irq_vectors(udev->pdev, 1, 1, PCI_IRQ_MSIX) == 1) {
231 dev_dbg(&udev->pdev->dev, "using MSI-X");
232 udev->info.irq_flags = IRQF_NO_THREAD;
233 udev->info.irq = pci_irq_vector(udev->pdev, 0);
234 udev->mode = RTE_INTR_MODE_MSIX;
239 /* fall back to MSI */
240 case RTE_INTR_MODE_MSI:
241 #ifndef HAVE_ALLOC_IRQ_VECTORS
242 if (pci_enable_msi(udev->pdev) == 0) {
243 dev_dbg(&udev->pdev->dev, "using MSI");
244 udev->info.irq_flags = IRQF_NO_THREAD;
245 udev->info.irq = udev->pdev->irq;
246 udev->mode = RTE_INTR_MODE_MSI;
250 if (pci_alloc_irq_vectors(udev->pdev, 1, 1, PCI_IRQ_MSI) == 1) {
251 dev_dbg(&udev->pdev->dev, "using MSI");
252 udev->info.irq_flags = IRQF_NO_THREAD;
253 udev->info.irq = pci_irq_vector(udev->pdev, 0);
254 udev->mode = RTE_INTR_MODE_MSI;
258 /* fall back to INTX */
259 case RTE_INTR_MODE_LEGACY:
260 if (pci_intx_mask_supported(udev->pdev)) {
261 dev_dbg(&udev->pdev->dev, "using INTX");
262 udev->info.irq_flags = IRQF_SHARED | IRQF_NO_THREAD;
263 udev->info.irq = udev->pdev->irq;
264 udev->mode = RTE_INTR_MODE_LEGACY;
267 dev_notice(&udev->pdev->dev, "PCI INTX mask not supported\n");
268 /* fall back to no IRQ */
269 case RTE_INTR_MODE_NONE:
270 udev->mode = RTE_INTR_MODE_NONE;
271 udev->info.irq = UIO_IRQ_NONE;
275 dev_err(&udev->pdev->dev, "invalid IRQ mode %u",
276 igbuio_intr_mode_preferred);
277 udev->info.irq = UIO_IRQ_NONE;
281 if (udev->info.irq != UIO_IRQ_NONE)
282 err = request_irq(udev->info.irq, igbuio_pci_irqhandler,
283 udev->info.irq_flags, udev->info.name,
285 dev_info(&udev->pdev->dev, "uio device registered with irq %ld\n",
292 igbuio_pci_disable_interrupts(struct rte_uio_pci_dev *udev)
294 if (udev->info.irq) {
295 free_irq(udev->info.irq, udev);
299 #ifndef HAVE_ALLOC_IRQ_VECTORS
300 if (udev->mode == RTE_INTR_MODE_MSIX)
301 pci_disable_msix(udev->pdev);
302 if (udev->mode == RTE_INTR_MODE_MSI)
303 pci_disable_msi(udev->pdev);
305 if (udev->mode == RTE_INTR_MODE_MSIX ||
306 udev->mode == RTE_INTR_MODE_MSI)
307 pci_free_irq_vectors(udev->pdev);
313 * This gets called while opening uio device file.
316 igbuio_pci_open(struct uio_info *info, struct inode *inode)
318 struct rte_uio_pci_dev *udev = info->priv;
319 struct pci_dev *dev = udev->pdev;
322 mutex_lock(&udev->lock);
323 if (++udev->refcnt > 1) {
324 mutex_unlock(&udev->lock);
328 /* set bus master, which was cleared by the reset function */
331 /* enable interrupts */
332 err = igbuio_pci_enable_interrupts(udev);
333 mutex_unlock(&udev->lock);
335 dev_err(&dev->dev, "Enable interrupt fails\n");
342 igbuio_pci_release(struct uio_info *info, struct inode *inode)
344 struct rte_uio_pci_dev *udev = info->priv;
345 struct pci_dev *dev = udev->pdev;
347 mutex_lock(&udev->lock);
348 if (--udev->refcnt > 0) {
349 mutex_unlock(&udev->lock);
353 /* disable interrupts */
354 igbuio_pci_disable_interrupts(udev);
356 /* stop the device from further DMA */
357 pci_clear_master(dev);
359 mutex_unlock(&udev->lock);
363 /* Remap pci resources described by bar #pci_bar in uio resource n. */
365 igbuio_pci_setup_iomem(struct pci_dev *dev, struct uio_info *info,
366 int n, int pci_bar, const char *name)
368 unsigned long addr, len;
371 if (n >= ARRAY_SIZE(info->mem))
374 addr = pci_resource_start(dev, pci_bar);
375 len = pci_resource_len(dev, pci_bar);
376 if (addr == 0 || len == 0)
378 internal_addr = ioremap(addr, len);
379 if (internal_addr == NULL)
381 info->mem[n].name = name;
382 info->mem[n].addr = addr;
383 info->mem[n].internal_addr = internal_addr;
384 info->mem[n].size = len;
385 info->mem[n].memtype = UIO_MEM_PHYS;
389 /* Get pci port io resources described by bar #pci_bar in uio resource n. */
391 igbuio_pci_setup_ioport(struct pci_dev *dev, struct uio_info *info,
392 int n, int pci_bar, const char *name)
394 unsigned long addr, len;
396 if (n >= ARRAY_SIZE(info->port))
399 addr = pci_resource_start(dev, pci_bar);
400 len = pci_resource_len(dev, pci_bar);
401 if (addr == 0 || len == 0)
404 info->port[n].name = name;
405 info->port[n].start = addr;
406 info->port[n].size = len;
407 info->port[n].porttype = UIO_PORT_X86;
412 /* Unmap previously ioremap'd resources */
414 igbuio_pci_release_iomem(struct uio_info *info)
418 for (i = 0; i < MAX_UIO_MAPS; i++) {
419 if (info->mem[i].internal_addr)
420 iounmap(info->mem[i].internal_addr);
425 igbuio_setup_bars(struct pci_dev *dev, struct uio_info *info)
427 int i, iom, iop, ret;
429 static const char *bar_names[PCI_STD_RESOURCE_END + 1] = {
441 for (i = 0; i < ARRAY_SIZE(bar_names); i++) {
442 if (pci_resource_len(dev, i) != 0 &&
443 pci_resource_start(dev, i) != 0) {
444 flags = pci_resource_flags(dev, i);
445 if (flags & IORESOURCE_MEM) {
446 ret = igbuio_pci_setup_iomem(dev, info, iom,
451 } else if (flags & IORESOURCE_IO) {
452 ret = igbuio_pci_setup_ioport(dev, info, iop,
461 return (iom != 0 || iop != 0) ? ret : -ENOENT;
464 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 8, 0)
469 igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
471 struct rte_uio_pci_dev *udev;
472 dma_addr_t map_dma_addr;
476 if (pci_is_bridge(dev)) {
477 dev_warn(&dev->dev, "Ignoring PCI bridge device\n");
481 udev = kzalloc(sizeof(struct rte_uio_pci_dev), GFP_KERNEL);
485 mutex_init(&udev->lock);
487 * enable device: ask low-level code to enable I/O and
490 err = pci_enable_device(dev);
492 dev_err(&dev->dev, "Cannot enable PCI device\n");
496 /* enable bus mastering on the device */
499 /* remap IO memory */
500 err = igbuio_setup_bars(dev, &udev->info);
502 goto fail_release_iomem;
504 /* set 64-bit DMA mask */
505 err = pci_set_dma_mask(dev, DMA_BIT_MASK(64));
507 dev_err(&dev->dev, "Cannot set DMA mask\n");
508 goto fail_release_iomem;
511 err = pci_set_consistent_dma_mask(dev, DMA_BIT_MASK(64));
513 dev_err(&dev->dev, "Cannot set consistent DMA mask\n");
514 goto fail_release_iomem;
518 udev->info.name = "igb_uio";
519 udev->info.version = "0.1";
520 udev->info.irqcontrol = igbuio_pci_irqcontrol;
521 udev->info.open = igbuio_pci_open;
522 udev->info.release = igbuio_pci_release;
523 udev->info.priv = udev;
526 err = sysfs_create_group(&dev->dev.kobj, &dev_attr_grp);
528 goto fail_release_iomem;
530 /* register uio driver */
531 err = uio_register_device(&dev->dev, &udev->info);
533 goto fail_remove_group;
535 pci_set_drvdata(dev, udev);
538 * Doing a harmless dma mapping for attaching the device to
539 * the iommu identity mapping if kernel boots with iommu=pt.
540 * Note this is not a problem if no IOMMU at all.
542 map_addr = dma_alloc_coherent(&dev->dev, 1024, &map_dma_addr,
545 memset(map_addr, 0, 1024);
548 dev_info(&dev->dev, "dma mapping failed\n");
550 dev_info(&dev->dev, "mapping 1K dma=%#llx host=%p\n",
551 (unsigned long long)map_dma_addr, map_addr);
553 dma_free_coherent(&dev->dev, 1024, map_addr, map_dma_addr);
554 dev_info(&dev->dev, "unmapping 1K dma=%#llx host=%p\n",
555 (unsigned long long)map_dma_addr, map_addr);
561 sysfs_remove_group(&dev->dev.kobj, &dev_attr_grp);
563 igbuio_pci_release_iomem(&udev->info);
564 pci_disable_device(dev);
572 igbuio_pci_remove(struct pci_dev *dev)
574 struct rte_uio_pci_dev *udev = pci_get_drvdata(dev);
576 mutex_destroy(&udev->lock);
577 sysfs_remove_group(&dev->dev.kobj, &dev_attr_grp);
578 uio_unregister_device(&udev->info);
579 igbuio_pci_release_iomem(&udev->info);
580 pci_disable_device(dev);
581 pci_set_drvdata(dev, NULL);
586 igbuio_config_intr_mode(char *intr_str)
589 pr_info("Use MSIX interrupt by default\n");
593 if (!strcmp(intr_str, RTE_INTR_MODE_MSIX_NAME)) {
594 igbuio_intr_mode_preferred = RTE_INTR_MODE_MSIX;
595 pr_info("Use MSIX interrupt\n");
596 } else if (!strcmp(intr_str, RTE_INTR_MODE_MSI_NAME)) {
597 igbuio_intr_mode_preferred = RTE_INTR_MODE_MSI;
598 pr_info("Use MSI interrupt\n");
599 } else if (!strcmp(intr_str, RTE_INTR_MODE_LEGACY_NAME)) {
600 igbuio_intr_mode_preferred = RTE_INTR_MODE_LEGACY;
601 pr_info("Use legacy interrupt\n");
603 pr_info("Error: bad parameter - %s\n", intr_str);
610 static struct pci_driver igbuio_pci_driver = {
613 .probe = igbuio_pci_probe,
614 .remove = igbuio_pci_remove,
618 igbuio_pci_init_module(void)
622 ret = igbuio_config_intr_mode(intr_mode);
626 return pci_register_driver(&igbuio_pci_driver);
630 igbuio_pci_exit_module(void)
632 pci_unregister_driver(&igbuio_pci_driver);
635 module_init(igbuio_pci_init_module);
636 module_exit(igbuio_pci_exit_module);
638 module_param(intr_mode, charp, S_IRUGO);
639 MODULE_PARM_DESC(intr_mode,
640 "igb_uio interrupt mode (default=msix):\n"
641 " " RTE_INTR_MODE_MSIX_NAME " Use MSIX interrupt\n"
642 " " RTE_INTR_MODE_MSI_NAME " Use MSI interrupt\n"
643 " " RTE_INTR_MODE_LEGACY_NAME " Use Legacy interrupt\n"
646 MODULE_DESCRIPTION("UIO driver for Intel IGB PCI cards");
647 MODULE_LICENSE("GPL");
648 MODULE_AUTHOR("Intel Corporation");