Re: [PATCH v8 3/6] pci:host: Add Altera PCIe host controller driver

From: kbuild test robot
Date: Thu Oct 08 2015 - 10:18:03 EST

Hi Ley,

[auto build test ERROR on v4.3-rc4 -- if it's inappropriate base, please ignore]

config: sparc-allmodconfig (attached as .config)
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=sparc

All errors (new ones prefixed by >>):

drivers/pci/host/pcie-altera.c: In function 'tlp_cfg_dword_read':
drivers/pci/host/pcie-altera.c:243:12: warning: large integer implicitly truncated to unsigned type [-Woverflow]
*value = ~0UL; /* return 0xFFFFFFFF if error */
^
drivers/pci/host/pcie-altera.c: In function 'altera_pcie_cfg_read':
drivers/pci/host/pcie-altera.c:291:12: warning: large integer implicitly truncated to unsigned type [-Woverflow]
*value = ~0UL;
^
drivers/pci/host/pcie-altera.c: In function 'altera_pcie_parse_request_of_pci_ranges':
>> drivers/pci/host/pcie-altera.c:410:2: error: implicit declaration of function 'of_pci_get_host_bridge_resources' [-Werror=implicit-function-declaration]
err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pcie->resources,
^
cc1: some warnings being treated as errors

vim +/of_pci_get_host_bridge_resources +410 drivers/pci/host/pcie-altera.c

237 headers[2] = TLP_CFG_DW2(bus, devfn, where);
238
239 tlp_write_packet(pcie, headers, 0, false);
240
241 ret = tlp_read_packet(pcie, value);
242 if (ret != PCIBIOS_SUCCESSFUL)
> 243 *value = ~0UL; /* return 0xFFFFFFFF if error */
244
245 return ret;
246 }
247
248 static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
249 int where, u32 value)
250 {
251 u32 headers[TLP_HDR_SIZE];
252 int ret;
253
254 if (bus == pcie->root_bus_nr)
255 headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR0);
256 else
257 headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR1);
258
259 headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
260 TLP_WRITE_TAG);
261 headers[2] = TLP_CFG_DW2(bus, devfn, where);
262
263 /* check alignment to Qword */
264 if ((where & 0x7) == 0)
265 tlp_write_packet(pcie, headers, value, true);
266 else
267 tlp_write_packet(pcie, headers, value, false);
268
269 ret = tlp_read_packet(pcie, NULL);
270 if (ret != PCIBIOS_SUCCESSFUL)
271 return ret;
272
273 /*
274 * Monitoring changes to PCI_PRIMARY_BUS register on root port and update
275 * local copy of root bus number accordingly.
276 */
277 if ((bus == pcie->root_bus_nr) && (where == PCI_PRIMARY_BUS))
278 pcie->root_bus_nr = (u8)(value);
279
280 return PCIBIOS_SUCCESSFUL;
281 }
282
283 static int altera_pcie_cfg_read(struct pci_bus *bus, unsigned int devfn,
284 int where, int size, u32 *value)
285 {
286 struct altera_pcie *pcie = bus->sysdata;
287 int ret;
288 u32 data;
289
290 if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn))) {
291 *value = ~0UL;
292 return PCIBIOS_DEVICE_NOT_FOUND;
293 }
294
295 ret = tlp_cfg_dword_read(pcie, bus->number, devfn,
296 (where & ~DWORD_MASK), &data);
297 if (ret != PCIBIOS_SUCCESSFUL)
298 return ret;
299
300 switch (size) {
301 case 1:
302 *value = (data >> (8 * (where & 0x3))) & 0xff;
303 break;
304 case 2:
305 *value = (data >> (8 * (where & 0x2))) & 0xffff;
306 break;
307 default:
308 *value = data;
309 break;
310 }
311
312 return PCIBIOS_SUCCESSFUL;
313 }
314
315 static int altera_pcie_cfg_write(struct pci_bus *bus, unsigned int devfn,
316 int where, int size, u32 value)
317 {
318 struct altera_pcie *pcie = bus->sysdata;
319 u32 data32;
320 u32 shift = 8 * (where & 3);
321 int ret;
322
323 if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn)))
324 return PCIBIOS_DEVICE_NOT_FOUND;
325
326 /* write partial */
327 if (size != sizeof(u32)) {
328 ret = tlp_cfg_dword_read(pcie, bus->number, devfn,
329 where & ~DWORD_MASK, &data32);
330 if (ret)
331 return ret;
332 }
333
334 switch (size) {
335 case 1:
336 data32 = (data32 & ~(0xff << shift)) |
337 ((value & 0xff) << shift);
338 break;
339 case 2:
340 data32 = (data32 & ~(0xffff << shift)) |
341 ((value & 0xffff) << shift);
342 break;
343 default:
344 data32 = value;
345 break;
346 }
347
348 return tlp_cfg_dword_write(pcie, bus->number, devfn,
349 (where & ~DWORD_MASK), data32);
350 }
351
352 static struct pci_ops altera_pcie_ops = {
353 .read = altera_pcie_cfg_read,
354 .write = altera_pcie_cfg_write,
355 };
356
357 static int altera_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
358 irq_hw_number_t hwirq)
359 {
360 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
361 irq_set_chip_data(irq, domain->host_data);
362
363 return 0;
364 }
365
366 static const struct irq_domain_ops intx_domain_ops = {
367 .map = altera_pcie_intx_map,
368 };
369
370 static void altera_pcie_isr(struct irq_desc *desc)
371 {
372 struct irq_chip *chip = irq_desc_get_chip(desc);
373 struct altera_pcie *pcie;
374 unsigned long status;
375 u32 bit;
376 u32 virq;
377
378 chained_irq_enter(chip, desc);
379 pcie = irq_desc_get_handler_data(desc);
380
381 while ((status = cra_readl(pcie, P2A_INT_STATUS)
382 & P2A_INT_STS_ALL) != 0) {
383 for_each_set_bit(bit, &status, INTX_NUM) {
384 /* clear interrupts */
385 cra_writel(pcie, 1 << bit, P2A_INT_STATUS);
386
387 virq = irq_find_mapping(pcie->irq_domain, bit + 1);
388 if (virq)
389 generic_handle_irq(virq);
390 else
391 dev_err(&pcie->pdev->dev, "unexpected IRQ\n");
392 }
393 }
394
395 chained_irq_exit(chip, desc);
396 }
397
398 static void altera_pcie_release_of_pci_ranges(struct altera_pcie *pcie)
399 {
400 pci_free_resource_list(&pcie->resources);
401 }
402
403 static int altera_pcie_parse_request_of_pci_ranges(struct altera_pcie *pcie)
404 {
405 int err, res_valid = 0;
406 struct device *dev = &pcie->pdev->dev;
407 struct device_node *np = dev->of_node;
408 struct resource_entry *win;
409
> 410 err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pcie->resources,
411 NULL);
412 if (err)
413 return err;

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