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@@ -0,0 +1,565 @@
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+/*
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+ * The file intends to implement the platform dependent EEH operations on pseries.
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+ * Actually, the pseries platform is built based on RTAS heavily. That means the
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+ * pseries platform dependent EEH operations will be built on RTAS calls. The functions
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+ * are devired from arch/powerpc/platforms/pseries/eeh.c and necessary cleanup has
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+ * been done.
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+ *
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+ * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2011.
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+ * Copyright IBM Corporation 2001, 2005, 2006
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+ * Copyright Dave Engebretsen & Todd Inglett 2001
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+ * Copyright Linas Vepstas 2005, 2006
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+
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+#include <linux/atomic.h>
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+#include <linux/delay.h>
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+#include <linux/export.h>
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+#include <linux/init.h>
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+#include <linux/list.h>
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+#include <linux/of.h>
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+#include <linux/pci.h>
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+#include <linux/proc_fs.h>
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+#include <linux/rbtree.h>
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+#include <linux/sched.h>
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+#include <linux/seq_file.h>
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+#include <linux/spinlock.h>
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+
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+#include <asm/eeh.h>
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+#include <asm/eeh_event.h>
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+#include <asm/io.h>
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+#include <asm/machdep.h>
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+#include <asm/ppc-pci.h>
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+#include <asm/rtas.h>
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+
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+/* RTAS tokens */
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+static int ibm_set_eeh_option;
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+static int ibm_set_slot_reset;
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+static int ibm_read_slot_reset_state;
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+static int ibm_read_slot_reset_state2;
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+static int ibm_slot_error_detail;
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+static int ibm_get_config_addr_info;
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+static int ibm_get_config_addr_info2;
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+static int ibm_configure_bridge;
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+static int ibm_configure_pe;
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+
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+/*
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+ * Buffer for reporting slot-error-detail rtas calls. Its here
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+ * in BSS, and not dynamically alloced, so that it ends up in
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+ * RMO where RTAS can access it.
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+ */
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+static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX];
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+static DEFINE_SPINLOCK(slot_errbuf_lock);
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+static int eeh_error_buf_size;
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+
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+/**
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+ * pseries_eeh_init - EEH platform dependent initialization
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+ *
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+ * EEH platform dependent initialization on pseries.
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+ */
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+static int pseries_eeh_init(void)
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+{
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+ /* figure out EEH RTAS function call tokens */
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+ ibm_set_eeh_option = rtas_token("ibm,set-eeh-option");
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+ ibm_set_slot_reset = rtas_token("ibm,set-slot-reset");
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+ ibm_read_slot_reset_state2 = rtas_token("ibm,read-slot-reset-state2");
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+ ibm_read_slot_reset_state = rtas_token("ibm,read-slot-reset-state");
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+ ibm_slot_error_detail = rtas_token("ibm,slot-error-detail");
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+ ibm_get_config_addr_info2 = rtas_token("ibm,get-config-addr-info2");
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+ ibm_get_config_addr_info = rtas_token("ibm,get-config-addr-info");
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+ ibm_configure_pe = rtas_token("ibm,configure-pe");
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+ ibm_configure_bridge = rtas_token ("ibm,configure-bridge");
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+
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+ /* necessary sanity check */
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+ if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE) {
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+ pr_warning("%s: RTAS service <ibm,set-eeh-option> invalid\n",
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+ __func__);
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+ return -EINVAL;
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+ } else if (ibm_set_slot_reset == RTAS_UNKNOWN_SERVICE) {
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+ pr_warning("%s: RTAS service <ibm, set-slot-reset> invalid\n",
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+ __func__);
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+ return -EINVAL;
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+ } else if (ibm_read_slot_reset_state2 == RTAS_UNKNOWN_SERVICE &&
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+ ibm_read_slot_reset_state == RTAS_UNKNOWN_SERVICE) {
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+ pr_warning("%s: RTAS service <ibm,read-slot-reset-state2> and "
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+ "<ibm,read-slot-reset-state> invalid\n",
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+ __func__);
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+ return -EINVAL;
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+ } else if (ibm_slot_error_detail == RTAS_UNKNOWN_SERVICE) {
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+ pr_warning("%s: RTAS service <ibm,slot-error-detail> invalid\n",
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+ __func__);
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+ return -EINVAL;
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+ } else if (ibm_get_config_addr_info2 == RTAS_UNKNOWN_SERVICE &&
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+ ibm_get_config_addr_info == RTAS_UNKNOWN_SERVICE) {
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+ pr_warning("%s: RTAS service <ibm,get-config-addr-info2> and "
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+ "<ibm,get-config-addr-info> invalid\n",
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+ __func__);
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+ return -EINVAL;
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+ } else if (ibm_configure_pe == RTAS_UNKNOWN_SERVICE &&
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+ ibm_configure_bridge == RTAS_UNKNOWN_SERVICE) {
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+ pr_warning("%s: RTAS service <ibm,configure-pe> and "
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+ "<ibm,configure-bridge> invalid\n",
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+ __func__);
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+ return -EINVAL;
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+ }
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+
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+ /* Initialize error log lock and size */
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+ spin_lock_init(&slot_errbuf_lock);
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+ eeh_error_buf_size = rtas_token("rtas-error-log-max");
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+ if (eeh_error_buf_size == RTAS_UNKNOWN_SERVICE) {
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+ pr_warning("%s: unknown EEH error log size\n",
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+ __func__);
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+ eeh_error_buf_size = 1024;
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+ } else if (eeh_error_buf_size > RTAS_ERROR_LOG_MAX) {
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+ pr_warning("%s: EEH error log size %d exceeds the maximal %d\n",
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+ __func__, eeh_error_buf_size, RTAS_ERROR_LOG_MAX);
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+ eeh_error_buf_size = RTAS_ERROR_LOG_MAX;
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+ }
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+
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+ return 0;
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+}
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+
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+/**
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+ * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable
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+ * @dn: device node
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+ * @option: operation to be issued
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+ *
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+ * The function is used to control the EEH functionality globally.
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+ * Currently, following options are support according to PAPR:
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+ * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
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+ */
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+static int pseries_eeh_set_option(struct device_node *dn, int option)
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+{
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+ int ret = 0;
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+ struct eeh_dev *edev;
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+ const u32 *reg;
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+ int config_addr;
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+
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+ edev = of_node_to_eeh_dev(dn);
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+
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+ /*
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+ * When we're enabling or disabling EEH functioality on
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+ * the particular PE, the PE config address is possibly
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+ * unavailable. Therefore, we have to figure it out from
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+ * the FDT node.
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+ */
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+ switch (option) {
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+ case EEH_OPT_DISABLE:
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+ case EEH_OPT_ENABLE:
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+ reg = of_get_property(dn, "reg", NULL);
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+ config_addr = reg[0];
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+ break;
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+
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+ case EEH_OPT_THAW_MMIO:
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+ case EEH_OPT_THAW_DMA:
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+ config_addr = edev->config_addr;
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+ if (edev->pe_config_addr)
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+ config_addr = edev->pe_config_addr;
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+ break;
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+
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+ default:
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+ pr_err("%s: Invalid option %d\n",
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+ __func__, option);
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+ return -EINVAL;
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+ }
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+
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+ ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL,
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+ config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid), option);
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+
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+ return ret;
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+}
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+
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+/**
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+ * pseries_eeh_get_pe_addr - Retrieve PE address
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+ * @dn: device node
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+ *
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+ * Retrieve the assocated PE address. Actually, there're 2 RTAS
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+ * function calls dedicated for the purpose. We need implement
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+ * it through the new function and then the old one. Besides,
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+ * you should make sure the config address is figured out from
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+ * FDT node before calling the function.
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+ *
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+ * It's notable that zero'ed return value means invalid PE config
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+ * address.
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+ */
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+static int pseries_eeh_get_pe_addr(struct device_node *dn)
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+{
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+ struct eeh_dev *edev;
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+ int ret = 0;
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+ int rets[3];
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+
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+ edev = of_node_to_eeh_dev(dn);
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+
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+ if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) {
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+ /*
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+ * First of all, we need to make sure there has one PE
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+ * associated with the device. Otherwise, PE address is
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+ * meaningless.
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+ */
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+ ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
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+ edev->config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid), 1);
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+ if (ret || (rets[0] == 0))
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+ return 0;
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+
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+ /* Retrieve the associated PE config address */
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+ ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
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+ edev->config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid), 0);
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+ if (ret) {
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+ pr_warning("%s: Failed to get PE address for %s\n",
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+ __func__, dn->full_name);
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+ return 0;
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+ }
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+
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+ return rets[0];
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+ }
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+
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+ if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
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+ ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets,
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+ edev->config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid), 0);
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+ if (ret) {
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+ pr_warning("%s: Failed to get PE address for %s\n",
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+ __func__, dn->full_name);
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+ return 0;
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+ }
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+
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+ return rets[0];
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+ }
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+
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+ return ret;
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+}
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+
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+/**
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+ * pseries_eeh_get_state - Retrieve PE state
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+ * @dn: PE associated device node
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+ * @state: return value
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+ *
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+ * Retrieve the state of the specified PE. On RTAS compliant
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+ * pseries platform, there already has one dedicated RTAS function
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+ * for the purpose. It's notable that the associated PE config address
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+ * might be ready when calling the function. Therefore, endeavour to
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+ * use the PE config address if possible. Further more, there're 2
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+ * RTAS calls for the purpose, we need to try the new one and back
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+ * to the old one if the new one couldn't work properly.
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+ */
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+static int pseries_eeh_get_state(struct device_node *dn, int *state)
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+{
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+ struct eeh_dev *edev;
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+ int config_addr;
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+ int ret;
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+ int rets[4];
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+ int result;
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+
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+ /* Figure out PE config address if possible */
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+ edev = of_node_to_eeh_dev(dn);
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+ config_addr = edev->config_addr;
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+ if (edev->pe_config_addr)
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+ config_addr = edev->pe_config_addr;
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+
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+ if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) {
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+ ret = rtas_call(ibm_read_slot_reset_state2, 3, 4, rets,
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+ config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid));
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+ } else if (ibm_read_slot_reset_state != RTAS_UNKNOWN_SERVICE) {
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+ /* Fake PE unavailable info */
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+ rets[2] = 0;
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+ ret = rtas_call(ibm_read_slot_reset_state, 3, 3, rets,
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+ config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid));
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+ } else {
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+ return EEH_STATE_NOT_SUPPORT;
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+ }
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+
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+ if (ret)
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+ return ret;
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+
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+ /* Parse the result out */
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+ result = 0;
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+ if (rets[1]) {
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+ switch(rets[0]) {
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+ case 0:
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+ result &= ~EEH_STATE_RESET_ACTIVE;
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+ result |= EEH_STATE_MMIO_ACTIVE;
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+ result |= EEH_STATE_DMA_ACTIVE;
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+ break;
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+ case 1:
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+ result |= EEH_STATE_RESET_ACTIVE;
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+ result |= EEH_STATE_MMIO_ACTIVE;
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+ result |= EEH_STATE_DMA_ACTIVE;
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+ break;
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+ case 2:
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+ result &= ~EEH_STATE_RESET_ACTIVE;
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+ result &= ~EEH_STATE_MMIO_ACTIVE;
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+ result &= ~EEH_STATE_DMA_ACTIVE;
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+ break;
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+ case 4:
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+ result &= ~EEH_STATE_RESET_ACTIVE;
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+ result &= ~EEH_STATE_MMIO_ACTIVE;
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+ result &= ~EEH_STATE_DMA_ACTIVE;
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+ result |= EEH_STATE_MMIO_ENABLED;
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+ break;
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+ case 5:
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+ if (rets[2]) {
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+ if (state) *state = rets[2];
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+ result = EEH_STATE_UNAVAILABLE;
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+ } else {
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+ result = EEH_STATE_NOT_SUPPORT;
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+ }
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+ default:
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+ result = EEH_STATE_NOT_SUPPORT;
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+ }
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+ } else {
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+ result = EEH_STATE_NOT_SUPPORT;
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+ }
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+
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+ return result;
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+}
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+
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+/**
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+ * pseries_eeh_reset - Reset the specified PE
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+ * @dn: PE associated device node
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+ * @option: reset option
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+ *
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+ * Reset the specified PE
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+ */
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+static int pseries_eeh_reset(struct device_node *dn, int option)
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+{
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+ struct eeh_dev *edev;
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+ int config_addr;
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+ int ret;
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+
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+ /* Figure out PE address */
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+ edev = of_node_to_eeh_dev(dn);
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+ config_addr = edev->config_addr;
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+ if (edev->pe_config_addr)
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+ config_addr = edev->pe_config_addr;
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+
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+ /* Reset PE through RTAS call */
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+ ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
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+ config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid), option);
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+
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+ /* If fundamental-reset not supported, try hot-reset */
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+ if (option == EEH_RESET_FUNDAMENTAL &&
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+ ret == -8) {
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+ ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
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+ config_addr, BUID_HI(edev->phb->buid),
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+ BUID_LO(edev->phb->buid), EEH_RESET_HOT);
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+ }
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+
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+ return ret;
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+}
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+
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+/**
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+ * pseries_eeh_wait_state - Wait for PE state
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+ * @dn: PE associated device node
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+ * @max_wait: maximal period in microsecond
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+ *
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+ * Wait for the state of associated PE. It might take some time
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+ * to retrieve the PE's state.
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+ */
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+static int pseries_eeh_wait_state(struct device_node *dn, int max_wait)
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+{
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+ int ret;
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+ int mwait;
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+
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|
|
+ /*
|
|
|
+ * According to PAPR, the state of PE might be temporarily
|
|
|
+ * unavailable. Under the circumstance, we have to wait
|
|
|
+ * for indicated time determined by firmware. The maximal
|
|
|
+ * wait time is 5 minutes, which is acquired from the original
|
|
|
+ * EEH implementation. Also, the original implementation
|
|
|
+ * also defined the minimal wait time as 1 second.
|
|
|
+ */
|
|
|
+#define EEH_STATE_MIN_WAIT_TIME (1000)
|
|
|
+#define EEH_STATE_MAX_WAIT_TIME (300 * 1000)
|
|
|
+
|
|
|
+ while (1) {
|
|
|
+ ret = pseries_eeh_get_state(dn, &mwait);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * If the PE's state is temporarily unavailable,
|
|
|
+ * we have to wait for the specified time. Otherwise,
|
|
|
+ * the PE's state will be returned immediately.
|
|
|
+ */
|
|
|
+ if (ret != EEH_STATE_UNAVAILABLE)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ if (max_wait <= 0) {
|
|
|
+ pr_warning("%s: Timeout when getting PE's state (%d)\n",
|
|
|
+ __func__, max_wait);
|
|
|
+ return EEH_STATE_NOT_SUPPORT;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (mwait <= 0) {
|
|
|
+ pr_warning("%s: Firmware returned bad wait value %d\n",
|
|
|
+ __func__, mwait);
|
|
|
+ mwait = EEH_STATE_MIN_WAIT_TIME;
|
|
|
+ } else if (mwait > EEH_STATE_MAX_WAIT_TIME) {
|
|
|
+ pr_warning("%s: Firmware returned too long wait value %d\n",
|
|
|
+ __func__, mwait);
|
|
|
+ mwait = EEH_STATE_MAX_WAIT_TIME;
|
|
|
+ }
|
|
|
+
|
|
|
+ max_wait -= mwait;
|
|
|
+ msleep(mwait);
|
|
|
+ }
|
|
|
+
|
|
|
+ return EEH_STATE_NOT_SUPPORT;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * pseries_eeh_get_log - Retrieve error log
|
|
|
+ * @dn: device node
|
|
|
+ * @severity: temporary or permanent error log
|
|
|
+ * @drv_log: driver log to be combined with retrieved error log
|
|
|
+ * @len: length of driver log
|
|
|
+ *
|
|
|
+ * Retrieve the temporary or permanent error from the PE.
|
|
|
+ * Actually, the error will be retrieved through the dedicated
|
|
|
+ * RTAS call.
|
|
|
+ */
|
|
|
+static int pseries_eeh_get_log(struct device_node *dn, int severity, char *drv_log, unsigned long len)
|
|
|
+{
|
|
|
+ struct eeh_dev *edev;
|
|
|
+ int config_addr;
|
|
|
+ unsigned long flags;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ edev = of_node_to_eeh_dev(dn);
|
|
|
+ spin_lock_irqsave(&slot_errbuf_lock, flags);
|
|
|
+ memset(slot_errbuf, 0, eeh_error_buf_size);
|
|
|
+
|
|
|
+ /* Figure out the PE address */
|
|
|
+ config_addr = edev->config_addr;
|
|
|
+ if (edev->pe_config_addr)
|
|
|
+ config_addr = edev->pe_config_addr;
|
|
|
+
|
|
|
+ ret = rtas_call(ibm_slot_error_detail, 8, 1, NULL, config_addr,
|
|
|
+ BUID_HI(edev->phb->buid), BUID_LO(edev->phb->buid),
|
|
|
+ virt_to_phys(drv_log), len,
|
|
|
+ virt_to_phys(slot_errbuf), eeh_error_buf_size,
|
|
|
+ severity);
|
|
|
+ if (!ret)
|
|
|
+ log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0);
|
|
|
+ spin_unlock_irqrestore(&slot_errbuf_lock, flags);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
|
|
|
+ * @dn: PE associated device node
|
|
|
+ *
|
|
|
+ * The function will be called to reconfigure the bridges included
|
|
|
+ * in the specified PE so that the mulfunctional PE would be recovered
|
|
|
+ * again.
|
|
|
+ */
|
|
|
+static int pseries_eeh_configure_bridge(struct device_node *dn)
|
|
|
+{
|
|
|
+ struct eeh_dev *edev;
|
|
|
+ int config_addr;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ /* Figure out the PE address */
|
|
|
+ edev = of_node_to_eeh_dev(dn);
|
|
|
+ config_addr = edev->config_addr;
|
|
|
+ if (edev->pe_config_addr)
|
|
|
+ config_addr = edev->pe_config_addr;
|
|
|
+
|
|
|
+ /* Use new configure-pe function, if supported */
|
|
|
+ if (ibm_configure_pe != RTAS_UNKNOWN_SERVICE) {
|
|
|
+ ret = rtas_call(ibm_configure_pe, 3, 1, NULL,
|
|
|
+ config_addr, BUID_HI(edev->phb->buid),
|
|
|
+ BUID_LO(edev->phb->buid));
|
|
|
+ } else if (ibm_configure_bridge != RTAS_UNKNOWN_SERVICE) {
|
|
|
+ ret = rtas_call(ibm_configure_bridge, 3, 1, NULL,
|
|
|
+ config_addr, BUID_HI(edev->phb->buid),
|
|
|
+ BUID_LO(edev->phb->buid));
|
|
|
+ } else {
|
|
|
+ return -EFAULT;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ret)
|
|
|
+ pr_warning("%s: Unable to configure bridge %d for %s\n",
|
|
|
+ __func__, ret, dn->full_name);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * pseries_eeh_read_config - Read PCI config space
|
|
|
+ * @dn: device node
|
|
|
+ * @where: PCI address
|
|
|
+ * @size: size to read
|
|
|
+ * @val: return value
|
|
|
+ *
|
|
|
+ * Read config space from the speicifed device
|
|
|
+ */
|
|
|
+static int pseries_eeh_read_config(struct device_node *dn, int where, int size, u32 *val)
|
|
|
+{
|
|
|
+ struct pci_dn *pdn;
|
|
|
+
|
|
|
+ pdn = PCI_DN(dn);
|
|
|
+
|
|
|
+ return rtas_read_config(pdn, where, size, val);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * pseries_eeh_write_config - Write PCI config space
|
|
|
+ * @dn: device node
|
|
|
+ * @where: PCI address
|
|
|
+ * @size: size to write
|
|
|
+ * @val: value to be written
|
|
|
+ *
|
|
|
+ * Write config space to the specified device
|
|
|
+ */
|
|
|
+static int pseries_eeh_write_config(struct device_node *dn, int where, int size, u32 val)
|
|
|
+{
|
|
|
+ struct pci_dn *pdn;
|
|
|
+
|
|
|
+ pdn = PCI_DN(dn);
|
|
|
+
|
|
|
+ return rtas_write_config(pdn, where, size, val);
|
|
|
+}
|
|
|
+
|
|
|
+static struct eeh_ops pseries_eeh_ops = {
|
|
|
+ .name = "pseries",
|
|
|
+ .init = pseries_eeh_init,
|
|
|
+ .set_option = pseries_eeh_set_option,
|
|
|
+ .get_pe_addr = pseries_eeh_get_pe_addr,
|
|
|
+ .get_state = pseries_eeh_get_state,
|
|
|
+ .reset = pseries_eeh_reset,
|
|
|
+ .wait_state = pseries_eeh_wait_state,
|
|
|
+ .get_log = pseries_eeh_get_log,
|
|
|
+ .configure_bridge = pseries_eeh_configure_bridge,
|
|
|
+ .read_config = pseries_eeh_read_config,
|
|
|
+ .write_config = pseries_eeh_write_config
|
|
|
+};
|
|
|
+
|
|
|
+/**
|
|
|
+ * eeh_pseries_init - Register platform dependent EEH operations
|
|
|
+ *
|
|
|
+ * EEH initialization on pseries platform. This function should be
|
|
|
+ * called before any EEH related functions.
|
|
|
+ */
|
|
|
+int __init eeh_pseries_init(void)
|
|
|
+{
|
|
|
+ return eeh_ops_register(&pseries_eeh_ops);
|
|
|
+}
|
Benjamin Herrenschmidt