Merge branch 'pci/aer'

- Restore AER capability after resume (Mayurkumar Patel)

  - Add PoisonTLPBlocked AER counter (Rajat Jain)

  - Use for_each_set_bit() to simplify AER code (Andy Shevchenko)

  - Fix AER kernel-doc (Andy Shevchenko)

  - Add "pcie_ports=dpc-native" parameter to allow native use of DPC even
    if platform didn't grant control over AER (Olof Johansson)

* pci/aer:
  PCI/DPC: Add "pcie_ports=dpc-native" to allow DPC without AER control
  PCI/AER: Fix kernel-doc warnings
  PCI/AER: Use for_each_set_bit() to simplify code
  PCI/AER: Add PoisonTLPBlocked to Uncorrectable error counters
  PCI/AER: Save AER Capability for suspend/resume

Documentation/admin-guide/kernel-parameters.txt

@@ -3540,6 +3540,8 @@
 			even if the platform doesn't give the OS permission to
 			use them.  This may cause conflicts if the platform
 			also tries to use these services.
+		dpc-native	Use native PCIe service for DPC only.  May
+				cause conflicts if firmware uses AER or DPC.
 		compat	Disable native PCIe services (PME, AER, DPC, PCIe
 			hotplug).
 

drivers/pci/access.c

@@ -355,7 +355,7 @@ static inline bool pcie_cap_has_sltctl(const struct pci_dev *dev)
 	       pcie_caps_reg(dev) & PCI_EXP_FLAGS_SLOT;
 }
 
-static inline bool pcie_cap_has_rtctl(const struct pci_dev *dev)
+bool pcie_cap_has_rtctl(const struct pci_dev *dev)
 {
 	int type = pci_pcie_type(dev);
 

drivers/pci/pci.c

@@ -1359,6 +1359,7 @@ int pci_save_state(struct pci_dev *dev)
 
 	pci_save_ltr_state(dev);
 	pci_save_dpc_state(dev);
+	pci_save_aer_state(dev);
 	return pci_save_vc_state(dev);
 }
 EXPORT_SYMBOL(pci_save_state);
@@ -1472,6 +1473,7 @@ void pci_restore_state(struct pci_dev *dev)
 	pci_restore_dpc_state(dev);
 
 	pci_cleanup_aer_error_status_regs(dev);
+	pci_restore_aer_state(dev);
 
 	pci_restore_config_space(dev);
 

drivers/pci/pci.h

@@ -12,6 +12,7 @@ extern const unsigned char pcie_link_speed[];
 extern bool pci_early_dump;
 
 bool pcie_cap_has_lnkctl(const struct pci_dev *dev);
+bool pcie_cap_has_rtctl(const struct pci_dev *dev);
 
 /* Functions internal to the PCI core code */
 

drivers/pci/pcie/aer.c

@@ -15,6 +15,7 @@
 #define pr_fmt(fmt) "AER: " fmt
 #define dev_fmt pr_fmt
 
+#include <linux/bitops.h>
 #include <linux/cper.h>
 #include <linux/pci.h>
 #include <linux/pci-acpi.h>
@@ -36,7 +37,7 @@
 #define AER_ERROR_SOURCES_MAX		128
 
 #define AER_MAX_TYPEOF_COR_ERRS		16	/* as per PCI_ERR_COR_STATUS */
-#define AER_MAX_TYPEOF_UNCOR_ERRS	26	/* as per PCI_ERR_UNCOR_STATUS*/
+#define AER_MAX_TYPEOF_UNCOR_ERRS	27	/* as per PCI_ERR_UNCOR_STATUS*/
 
 struct aer_err_source {
 	unsigned int status;
@@ -201,6 +202,7 @@ void pcie_set_ecrc_checking(struct pci_dev *dev)
 
 /**
  * pcie_ecrc_get_policy - parse kernel command-line ecrc option
+ * @str: ECRC policy from kernel command line to use
  */
 void pcie_ecrc_get_policy(char *str)
 {
@@ -448,13 +450,71 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
 	return 0;
 }
 
+void pci_save_aer_state(struct pci_dev *dev)
+{
+	struct pci_cap_saved_state *save_state;
+	u32 *cap;
+	int pos;
+
+	pos = dev->aer_cap;
+	if (!pos)
+		return;
+
+	save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_ERR);
+	if (!save_state)
+		return;
+
+	cap = &save_state->cap.data[0];
+	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, cap++);
+	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, cap++);
+	pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, cap++);
+	pci_read_config_dword(dev, pos + PCI_ERR_CAP, cap++);
+	if (pcie_cap_has_rtctl(dev))
+		pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, cap++);
+}
+
+void pci_restore_aer_state(struct pci_dev *dev)
+{
+	struct pci_cap_saved_state *save_state;
+	u32 *cap;
+	int pos;
+
+	pos = dev->aer_cap;
+	if (!pos)
+		return;
+
+	save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_ERR);
+	if (!save_state)
+		return;
+
+	cap = &save_state->cap.data[0];
+	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, *cap++);
+	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, *cap++);
+	pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, *cap++);
+	pci_write_config_dword(dev, pos + PCI_ERR_CAP, *cap++);
+	if (pcie_cap_has_rtctl(dev))
+		pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, *cap++);
+}
+
 void pci_aer_init(struct pci_dev *dev)
 {
-	dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+	int n;
+
+	dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+	if (!dev->aer_cap)
+		return;
 
-	if (dev->aer_cap)
 	dev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL);
 
+	/*
+	 * We save/restore PCI_ERR_UNCOR_MASK, PCI_ERR_UNCOR_SEVER,
+	 * PCI_ERR_COR_MASK, and PCI_ERR_CAP.  Root and Root Complex Event
+	 * Collectors also implement PCI_ERR_ROOT_COMMAND (PCIe r5.0, sec
+	 * 7.8.4).
+	 */
+	n = pcie_cap_has_rtctl(dev) ? 5 : 4;
+	pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_ERR, sizeof(u32) * n);
+
 	pci_cleanup_aer_error_status_regs(dev);
 }
 
@@ -560,6 +620,7 @@ static const char *aer_uncorrectable_error_string[AER_MAX_TYPEOF_UNCOR_ERRS] = {
 	"BlockedTLP",			/* Bit Position 23	*/
 	"AtomicOpBlocked",		/* Bit Position 24	*/
 	"TLPBlockedErr",		/* Bit Position 25	*/
+	"PoisonTLPBlocked",		/* Bit Position 26	*/
 };
 
 static const char *aer_agent_string[] = {
@@ -657,7 +718,8 @@ const struct attribute_group aer_stats_attr_group = {
 static void pci_dev_aer_stats_incr(struct pci_dev *pdev,
 				   struct aer_err_info *info)
 {
-	int status, i, max = -1;
+	unsigned long status = info->status & ~info->mask;
+	int i, max = -1;
 	u64 *counter = NULL;
 	struct aer_stats *aer_stats = pdev->aer_stats;
 
@@ -682,9 +744,7 @@ static void pci_dev_aer_stats_incr(struct pci_dev *pdev,
 		break;
 	}
 
-	status = (info->status & ~info->mask);
-	for (i = 0; i < max; i++)
-		if (status & (1 << i))
+	for_each_set_bit(i, &status, max)
 		counter[i]++;
 }
 
@@ -717,14 +777,11 @@ static void __print_tlp_header(struct pci_dev *dev,
 static void __aer_print_error(struct pci_dev *dev,
 			      struct aer_err_info *info)
 {
-	int i, status;
+	unsigned long status = info->status & ~info->mask;
 	const char *errmsg = NULL;
-	status = (info->status & ~info->mask);
-
-	for (i = 0; i < 32; i++) {
-		if (!(status & (1 << i)))
-			continue;
+	int i;
 
+	for_each_set_bit(i, &status, 32) {
 		if (info->severity == AER_CORRECTABLE)
 			errmsg = i < ARRAY_SIZE(aer_correctable_error_string) ?
 				aer_correctable_error_string[i] : NULL;
@@ -1204,7 +1261,8 @@ static void aer_isr_one_error(struct aer_rpc *rpc,
 
 /**
  * aer_isr - consume errors detected by root port
- * @work: definition of this work item
+ * @irq: IRQ assigned to Root Port
+ * @context: pointer to Root Port data structure
  *
  * Invoked, as DPC, when root port records new detected error
  */

drivers/pci/pcie/dpc.c

@@ -291,7 +291,7 @@ static int dpc_probe(struct pcie_device *dev)
 	int status;
 	u16 ctl, cap;
 
-	if (pcie_aer_get_firmware_first(pdev))
+	if (pcie_aer_get_firmware_first(pdev) && !pcie_ports_dpc_native)
 		return -ENOTSUPP;
 
 	dpc = devm_kzalloc(device, sizeof(*dpc), GFP_KERNEL);

drivers/pci/pcie/portdrv.h

@@ -25,6 +25,8 @@
 
 #define PCIE_PORT_DEVICE_MAXSERVICES   5
 
+extern bool pcie_ports_dpc_native;
+
 #ifdef CONFIG_PCIEAER
 int pcie_aer_init(void);
 #else

drivers/pci/pcie/portdrv_core.c

@@ -250,8 +250,13 @@ static int get_port_device_capability(struct pci_dev *dev)
 		pcie_pme_interrupt_enable(dev, false);
 	}
 
+	/*
+	 * With dpc-native, allow Linux to use DPC even if it doesn't have
+	 * permission to use AER.
+	 */
 	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
-	    pci_aer_available() && services & PCIE_PORT_SERVICE_AER)
+	    pci_aer_available() &&
+	    (pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
 	if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||

drivers/pci/pcie/portdrv_pci.c

@@ -29,12 +29,20 @@ bool pcie_ports_disabled;
  */
 bool pcie_ports_native;
 
+/*
+ * If the user specified "pcie_ports=dpc-native", use the Linux DPC PCIe
+ * service even if the platform hasn't given us permission.
+ */
+bool pcie_ports_dpc_native;
+
 static int __init pcie_port_setup(char *str)
 {
 	if (!strncmp(str, "compat", 6))
 		pcie_ports_disabled = true;
 	else if (!strncmp(str, "native", 6))
 		pcie_ports_native = true;
+	else if (!strncmp(str, "dpc-native", 10))
+		pcie_ports_dpc_native = true;
 
 	return 1;
 }

include/linux/aer.h

@@ -46,6 +46,8 @@ int pci_enable_pcie_error_reporting(struct pci_dev *dev);
 int pci_disable_pcie_error_reporting(struct pci_dev *dev);
 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev);
 int pci_cleanup_aer_error_status_regs(struct pci_dev *dev);
+void pci_save_aer_state(struct pci_dev *dev);
+void pci_restore_aer_state(struct pci_dev *dev);
 #else
 static inline int pci_enable_pcie_error_reporting(struct pci_dev *dev)
 {
@@ -63,6 +65,8 @@ static inline int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
 {
 	return -EINVAL;
 }
+static inline void pci_save_aer_state(struct pci_dev *dev) {}
+static inline void pci_restore_aer_state(struct pci_dev *dev) {}
 #endif
 
 void cper_print_aer(struct pci_dev *dev, int aer_severity,