diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh_pseries.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh_pseries.c | 565 |
1 files changed, 565 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c new file mode 100644 index 000000000000..8752f79a6af8 --- /dev/null +++ b/arch/powerpc/platforms/pseries/eeh_pseries.c @@ -0,0 +1,565 @@ +/* + * The file intends to implement the platform dependent EEH operations on pseries. + * Actually, the pseries platform is built based on RTAS heavily. That means the + * pseries platform dependent EEH operations will be built on RTAS calls. The functions + * are devired from arch/powerpc/platforms/pseries/eeh.c and necessary cleanup has + * been done. + * + * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2011. + * Copyright IBM Corporation 2001, 2005, 2006 + * Copyright Dave Engebretsen & Todd Inglett 2001 + * Copyright Linas Vepstas 2005, 2006 + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/atomic.h> +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/of.h> +#include <linux/pci.h> +#include <linux/proc_fs.h> +#include <linux/rbtree.h> +#include <linux/sched.h> +#include <linux/seq_file.h> +#include <linux/spinlock.h> + +#include <asm/eeh.h> +#include <asm/eeh_event.h> +#include <asm/io.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> +#include <asm/rtas.h> + +/* RTAS tokens */ +static int ibm_set_eeh_option; +static int ibm_set_slot_reset; +static int ibm_read_slot_reset_state; +static int ibm_read_slot_reset_state2; +static int ibm_slot_error_detail; +static int ibm_get_config_addr_info; +static int ibm_get_config_addr_info2; +static int ibm_configure_bridge; +static int ibm_configure_pe; + +/* + * Buffer for reporting slot-error-detail rtas calls. Its here + * in BSS, and not dynamically alloced, so that it ends up in + * RMO where RTAS can access it. + */ +static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX]; +static DEFINE_SPINLOCK(slot_errbuf_lock); +static int eeh_error_buf_size; + +/** + * pseries_eeh_init - EEH platform dependent initialization + * + * EEH platform dependent initialization on pseries. + */ +static int pseries_eeh_init(void) +{ + /* figure out EEH RTAS function call tokens */ + ibm_set_eeh_option = rtas_token("ibm,set-eeh-option"); + ibm_set_slot_reset = rtas_token("ibm,set-slot-reset"); + ibm_read_slot_reset_state2 = rtas_token("ibm,read-slot-reset-state2"); + ibm_read_slot_reset_state = rtas_token("ibm,read-slot-reset-state"); + ibm_slot_error_detail = rtas_token("ibm,slot-error-detail"); + ibm_get_config_addr_info2 = rtas_token("ibm,get-config-addr-info2"); + ibm_get_config_addr_info = rtas_token("ibm,get-config-addr-info"); + ibm_configure_pe = rtas_token("ibm,configure-pe"); + ibm_configure_bridge = rtas_token ("ibm,configure-bridge"); + + /* necessary sanity check */ + if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE) { + pr_warning("%s: RTAS service <ibm,set-eeh-option> invalid\n", + __func__); + return -EINVAL; + } else if (ibm_set_slot_reset == RTAS_UNKNOWN_SERVICE) { + pr_warning("%s: RTAS service <ibm, set-slot-reset> invalid\n", + __func__); + return -EINVAL; + } else if (ibm_read_slot_reset_state2 == RTAS_UNKNOWN_SERVICE && + ibm_read_slot_reset_state == RTAS_UNKNOWN_SERVICE) { + pr_warning("%s: RTAS service <ibm,read-slot-reset-state2> and " + "<ibm,read-slot-reset-state> invalid\n", + __func__); + return -EINVAL; + } else if (ibm_slot_error_detail == RTAS_UNKNOWN_SERVICE) { + pr_warning("%s: RTAS service <ibm,slot-error-detail> invalid\n", + __func__); + return -EINVAL; + } else if (ibm_get_config_addr_info2 == RTAS_UNKNOWN_SERVICE && + ibm_get_config_addr_info == RTAS_UNKNOWN_SERVICE) { + pr_warning("%s: RTAS service <ibm,get-config-addr-info2> and " + "<ibm,get-config-addr-info> invalid\n", + __func__); + return -EINVAL; + } else if (ibm_configure_pe == RTAS_UNKNOWN_SERVICE && + ibm_configure_bridge == RTAS_UNKNOWN_SERVICE) { + pr_warning("%s: RTAS service <ibm,configure-pe> and " + "<ibm,configure-bridge> invalid\n", + __func__); + return -EINVAL; + } + + /* Initialize error log lock and size */ + spin_lock_init(&slot_errbuf_lock); + eeh_error_buf_size = rtas_token("rtas-error-log-max"); + if (eeh_error_buf_size == RTAS_UNKNOWN_SERVICE) { + pr_warning("%s: unknown EEH error log size\n", + __func__); + eeh_error_buf_size = 1024; + } else if (eeh_error_buf_size > RTAS_ERROR_LOG_MAX) { + pr_warning("%s: EEH error log size %d exceeds the maximal %d\n", + __func__, eeh_error_buf_size, RTAS_ERROR_LOG_MAX); + eeh_error_buf_size = RTAS_ERROR_LOG_MAX; + } + + return 0; +} + +/** + * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable + * @dn: device node + * @option: operation to be issued + * + * The function is used to control the EEH functionality globally. + * Currently, following options are support according to PAPR: + * Enable EEH, Disable EEH, Enable MMIO and Enable DMA + */ +static int pseries_eeh_set_option(struct device_node *dn, int option) +{ + int ret = 0; + struct eeh_dev *edev; + const u32 *reg; + int config_addr; + + edev = of_node_to_eeh_dev(dn); + + /* + * When we're enabling or disabling EEH functioality on + * the particular PE, the PE config address is possibly + * unavailable. Therefore, we have to figure it out from + * the FDT node. + */ + switch (option) { + case EEH_OPT_DISABLE: + case EEH_OPT_ENABLE: + reg = of_get_property(dn, "reg", NULL); + config_addr = reg[0]; + break; + + case EEH_OPT_THAW_MMIO: + case EEH_OPT_THAW_DMA: + config_addr = edev->config_addr; + if (edev->pe_config_addr) + config_addr = edev->pe_config_addr; + break; + + default: + pr_err("%s: Invalid option %d\n", + __func__, option); + return -EINVAL; + } + + ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL, + config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid), option); + + return ret; +} + +/** + * pseries_eeh_get_pe_addr - Retrieve PE address + * @dn: device node + * + * Retrieve the assocated PE address. Actually, there're 2 RTAS + * function calls dedicated for the purpose. We need implement + * it through the new function and then the old one. Besides, + * you should make sure the config address is figured out from + * FDT node before calling the function. + * + * It's notable that zero'ed return value means invalid PE config + * address. + */ +static int pseries_eeh_get_pe_addr(struct device_node *dn) +{ + struct eeh_dev *edev; + int ret = 0; + int rets[3]; + + edev = of_node_to_eeh_dev(dn); + + if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) { + /* + * First of all, we need to make sure there has one PE + * associated with the device. Otherwise, PE address is + * meaningless. + */ + ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets, + edev->config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid), 1); + if (ret || (rets[0] == 0)) + return 0; + + /* Retrieve the associated PE config address */ + ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets, + edev->config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid), 0); + if (ret) { + pr_warning("%s: Failed to get PE address for %s\n", + __func__, dn->full_name); + return 0; + } + + return rets[0]; + } + + if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) { + ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets, + edev->config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid), 0); + if (ret) { + pr_warning("%s: Failed to get PE address for %s\n", + __func__, dn->full_name); + return 0; + } + + return rets[0]; + } + + return ret; +} + +/** + * pseries_eeh_get_state - Retrieve PE state + * @dn: PE associated device node + * @state: return value + * + * Retrieve the state of the specified PE. On RTAS compliant + * pseries platform, there already has one dedicated RTAS function + * for the purpose. It's notable that the associated PE config address + * might be ready when calling the function. Therefore, endeavour to + * use the PE config address if possible. Further more, there're 2 + * RTAS calls for the purpose, we need to try the new one and back + * to the old one if the new one couldn't work properly. + */ +static int pseries_eeh_get_state(struct device_node *dn, int *state) +{ + struct eeh_dev *edev; + int config_addr; + int ret; + int rets[4]; + int result; + + /* Figure out PE config address if possible */ + edev = of_node_to_eeh_dev(dn); + config_addr = edev->config_addr; + if (edev->pe_config_addr) + config_addr = edev->pe_config_addr; + + if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) { + ret = rtas_call(ibm_read_slot_reset_state2, 3, 4, rets, + config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid)); + } else if (ibm_read_slot_reset_state != RTAS_UNKNOWN_SERVICE) { + /* Fake PE unavailable info */ + rets[2] = 0; + ret = rtas_call(ibm_read_slot_reset_state, 3, 3, rets, + config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid)); + } else { + return EEH_STATE_NOT_SUPPORT; + } + + if (ret) + return ret; + + /* Parse the result out */ + result = 0; + if (rets[1]) { + switch(rets[0]) { + case 0: + result &= ~EEH_STATE_RESET_ACTIVE; + result |= EEH_STATE_MMIO_ACTIVE; + result |= EEH_STATE_DMA_ACTIVE; + break; + case 1: + result |= EEH_STATE_RESET_ACTIVE; + result |= EEH_STATE_MMIO_ACTIVE; + result |= EEH_STATE_DMA_ACTIVE; + break; + case 2: + result &= ~EEH_STATE_RESET_ACTIVE; + result &= ~EEH_STATE_MMIO_ACTIVE; + result &= ~EEH_STATE_DMA_ACTIVE; + break; + case 4: + result &= ~EEH_STATE_RESET_ACTIVE; + result &= ~EEH_STATE_MMIO_ACTIVE; + result &= ~EEH_STATE_DMA_ACTIVE; + result |= EEH_STATE_MMIO_ENABLED; + break; + case 5: + if (rets[2]) { + if (state) *state = rets[2]; + result = EEH_STATE_UNAVAILABLE; + } else { + result = EEH_STATE_NOT_SUPPORT; + } + default: + result = EEH_STATE_NOT_SUPPORT; + } + } else { + result = EEH_STATE_NOT_SUPPORT; + } + + return result; +} + +/** + * pseries_eeh_reset - Reset the specified PE + * @dn: PE associated device node + * @option: reset option + * + * Reset the specified PE + */ +static int pseries_eeh_reset(struct device_node *dn, int option) +{ + struct eeh_dev *edev; + int config_addr; + int ret; + + /* Figure out 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; + + /* Reset PE through RTAS call */ + ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL, + config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid), option); + + /* If fundamental-reset not supported, try hot-reset */ + if (option == EEH_RESET_FUNDAMENTAL && + ret == -8) { + ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL, + config_addr, BUID_HI(edev->phb->buid), + BUID_LO(edev->phb->buid), EEH_RESET_HOT); + } + + return ret; +} + +/** + * pseries_eeh_wait_state - Wait for PE state + * @dn: PE associated device node + * @max_wait: maximal period in microsecond + * + * Wait for the state of associated PE. It might take some time + * to retrieve the PE's state. + */ +static int pseries_eeh_wait_state(struct device_node *dn, int max_wait) +{ + int ret; + int mwait; + + /* + * 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); +} |