diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/platforms/pseries/eeh_pseries.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/platforms/pseries/eeh_pseries.c | 565 |
1 files changed, 0 insertions, 565 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/eeh_pseries.c b/ANDROID_3.4.5/arch/powerpc/platforms/pseries/eeh_pseries.c deleted file mode 100644 index 8752f79a..00000000 --- a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/eeh_pseries.c +++ /dev/null @@ -1,565 +0,0 @@ -/* - * 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); -} |