pcie/aer: helper functions for pcie aer capability

This patch implements helper functions for pcie aer capability
which will be used later.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

Makefile.objs

@@ -207,7 +207,7 @@ hw-obj-$(CONFIG_PIIX4) += piix4.o
 # PCI watchdog devices
 hw-obj-y += wdt_i6300esb.o
 
-hw-obj-y += pcie.o pcie_port.o
+hw-obj-y += pcie.o pcie_aer.o pcie_port.o
 hw-obj-y += msix.o msi.o
 
 # PCI network cards

hw/pcie.h

@@ -24,6 +24,7 @@
 #include "hw.h"
 #include "pci_regs.h"
 #include "pcie_regs.h"
+#include "pcie_aer.h"
 
 typedef enum {
     /* for attention and power indicator */
@@ -79,6 +80,19 @@ struct PCIExpressDevice {
                          Software Notification of Hot-Plug Events, an interrupt
                          is sent whenever the logical and of these conditions
                          transitions from false to true. */
+
+    /* AER */
+    uint16_t aer_cap;
+    PCIEAERLog aer_log;
+    unsigned int aer_intx;      /* INTx for error reporting
+                                 * default is 0 = INTA#
+                                 * If the chip wants to use other interrupt
+                                 * line, initialize this member with the
+                                 * desired number.
+                                 * If the chip dynamically changes this member,
+                                 * also initialize it when loaded as
+                                 * appropreately.
+                                 */
 };
 
 /* PCI express capability helper functions */

hw/pcie_aer.h

+/*
+ * pcie_aer.h
+ *
+ * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef QEMU_PCIE_AER_H
+#define QEMU_PCIE_AER_H
+
+#include "hw.h"
+
+/* definitions which PCIExpressDevice uses */
+
+/* AER log */
+struct PCIEAERLog {
+    /* This structure is saved/loaded.
+       So explicitly size them instead of unsigned int */
+
+    /* the number of currently recorded log in log member */
+    uint16_t log_num;
+
+    /*
+     * The maximum number of the log. Errors can be logged up to this.
+     *
+     * This is configurable property.
+     * The specified value will be clipped down to PCIE_AER_LOG_MAX_LIMIT
+     * to avoid unreasonable memory usage.
+     * I bet that 128 log size would be big enough, otherwise too many errors
+     * for system to function normaly. But could consecutive errors occur?
+     */
+#define PCIE_AER_LOG_MAX_DEFAULT        8
+#define PCIE_AER_LOG_MAX_LIMIT          128
+#define PCIE_AER_LOG_MAX_UNSET          0xffff
+    uint16_t log_max;
+
+    /* Error log. log_max-sized array */
+    PCIEAERErr *log;
+};
+
+/* aer error message: error signaling message has only error sevirity and
+   source id. See 2.2.8.3 error signaling messages */
+struct PCIEAERMsg {
+    /*
+     * PCI_ERR_ROOT_CMD_{COR, NONFATAL, FATAL}_EN
+     * = PCI_EXP_DEVCTL_{CERE, NFERE, FERE}
+     */
+    uint32_t severity;
+
+    uint16_t source_id; /* bdf */
+};
+
+static inline bool
+pcie_aer_msg_is_uncor(const PCIEAERMsg *msg)
+{
+    return msg->severity == PCI_ERR_ROOT_CMD_NONFATAL_EN ||
+        msg->severity == PCI_ERR_ROOT_CMD_FATAL_EN;
+}
+
+/* error */
+struct PCIEAERErr {
+    uint32_t status;    /* error status bits */
+    uint16_t source_id; /* bdf */
+
+#define PCIE_AER_ERR_IS_CORRECTABLE     0x1     /* correctable/uncorrectable */
+#define PCIE_AER_ERR_MAYBE_ADVISORY     0x2     /* maybe advisory non-fatal */
+#define PCIE_AER_ERR_HEADER_VALID       0x4     /* TLP header is logged */
+#define PCIE_AER_ERR_TLP_PREFIX_PRESENT 0x8     /* TLP Prefix is logged */
+    uint16_t flags;
+
+    uint32_t header[4]; /* TLP header */
+    uint32_t prefix[4]; /* TLP header prefix */
+};
+
+extern const VMStateDescription vmstate_pcie_aer_log;
+
+int pcie_aer_init(PCIDevice *dev, uint16_t offset);
+void pcie_aer_exit(PCIDevice *dev);
+void pcie_aer_write_config(PCIDevice *dev,
+                           uint32_t addr, uint32_t val, int len);
+
+/* aer root port */
+void pcie_aer_root_set_vector(PCIDevice *dev, unsigned int vector);
+void pcie_aer_root_init(PCIDevice *dev);
+void pcie_aer_root_reset(PCIDevice *dev);
+void pcie_aer_root_write_config(PCIDevice *dev,
+                                uint32_t addr, uint32_t val, int len,
+                                uint32_t root_cmd_prev);
+
+/* error injection */
+int pcie_aer_inject_error(PCIDevice *dev, const PCIEAERErr *err);
+
+#endif /* QEMU_PCIE_AER_H */

qemu-common.h

@@ -240,6 +240,9 @@ typedef struct PCIBus PCIBus;
 typedef struct PCIDevice PCIDevice;
 typedef struct PCIExpressDevice PCIExpressDevice;
 typedef struct PCIBridge PCIBridge;
+typedef struct PCIEAERMsg PCIEAERMsg;
+typedef struct PCIEAERLog PCIEAERLog;
+typedef struct PCIEAERErr PCIEAERErr;
 typedef struct PCIEPort PCIEPort;
 typedef struct PCIESlot PCIESlot;
 typedef struct SerialState SerialState;