PCI: Add pci_info_ratelimited() to ratelimit PCI separately

Do not use printk_ratelimit() in drivers/pci/pci.c as it shares the rate
limiting state with all other callers to the printk_ratelimit().

Add pci_info_ratelimited() (similar to pci_notice_ratelimited() added in
the commit a88a7b3e ("vfio: Use dev_printk() when possible")) and use
it instead of printk_ratelimit() + pci_info().

Link: https://lore.kernel.org/r/20190825224616.8021-1-kw@linux.comSigned-off-by: Krzysztof Wilczynski <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci.c

@@ -890,8 +890,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
 
 	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
 	dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
-	if (dev->current_state != state && printk_ratelimit())
-		pci_info(dev, "Refused to change power state, currently in D%d\n",
+	if (dev->current_state != state)
+		pci_info_ratelimited(dev, "Refused to change power state, currently in D%d\n",
 			 dev->current_state);
 
 	/*

include/linux/pci.h

@@ -2433,4 +2433,7 @@ void pci_uevent_ers(struct pci_dev *pdev, enum  pci_ers_result err_type);
 #define pci_notice_ratelimited(pdev, fmt, arg...) \
 	dev_notice_ratelimited(&(pdev)->dev, fmt, ##arg)
 
+#define pci_info_ratelimited(pdev, fmt, arg...) \
+	dev_info_ratelimited(&(pdev)->dev, fmt, ##arg)
+
 #endif /* LINUX_PCI_H */