/* * Copyright (C) 2007 by Alan Stern * * 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* this file is part of ehci-hcd.c */ /* Display the ports dedicated to the companion controller */ static ssize_t show_companion(struct device *dev, struct device_attribute *attr, char *buf) { struct ehci_hcd *ehci; int nports, index, n; int count = PAGE_SIZE; char *ptr = buf; ehci = hcd_to_ehci(dev_get_drvdata(dev)); nports = HCS_N_PORTS(ehci->hcs_params); for (index = 0; index < nports; ++index) { if (test_bit(index, &ehci->companion_ports)) { n = scnprintf(ptr, count, "%d\n", index + 1); ptr += n; count -= n; } } return ptr - buf; } /* * Dedicate or undedicate a port to the companion controller. * Syntax is "[-]portnum", where a leading '-' sign means * return control of the port to the EHCI controller. */ static ssize_t store_companion(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ehci_hcd *ehci; int portnum, new_owner; ehci = hcd_to_ehci(dev_get_drvdata(dev)); new_owner = PORT_OWNER; /* Owned by companion */ if (sscanf(buf, "%d", &portnum) != 1) return -EINVAL; if (portnum < 0) { portnum = - portnum; new_owner = 0; /* Owned by EHCI */ } if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params)) return -ENOENT; portnum--; if (new_owner) set_bit(portnum, &ehci->companion_ports); else clear_bit(portnum, &ehci->companion_ports); set_owner(ehci, portnum, new_owner); return count; } static DEVICE_ATTR(companion, 0644, show_companion, store_companion); /* * Display / Set uframe_periodic_max */ static ssize_t show_uframe_periodic_max(struct device *dev, struct device_attribute *attr, char *buf) { struct ehci_hcd *ehci; int n; ehci = hcd_to_ehci(dev_get_drvdata(dev)); n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max); return n; } static ssize_t store_uframe_periodic_max(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ehci_hcd *ehci; unsigned uframe_periodic_max; unsigned uframe; unsigned long flags; ssize_t ret; ehci = hcd_to_ehci(dev_get_drvdata(dev)); if (kstrtouint(buf, 0, &uframe_periodic_max) < 0) return -EINVAL; if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) { ehci_info(ehci, "rejecting invalid request for " "uframe_periodic_max=%u\n", uframe_periodic_max); return -EINVAL; } ret = -EINVAL; /* * lock, so that our checking does not race with possible periodic * bandwidth allocation through submitting new urbs. */ spin_lock_irqsave (&ehci->lock, flags); /* * for request to decrease max periodic bandwidth, we have to check * to see whether the decrease is possible. */ if (uframe_periodic_max < ehci->uframe_periodic_max) { u8 allocated_max = 0; for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe) allocated_max = max(allocated_max, ehci->bandwidth[uframe]); if (allocated_max > uframe_periodic_max) { ehci_info(ehci, "cannot decrease uframe_periodic_max because " "periodic bandwidth is already allocated " "(%u > %u)\n", allocated_max, uframe_periodic_max); goto out_unlock; } } /* increasing is always ok */ ehci_info(ehci, "setting max periodic bandwidth to %u%% " "(== %u usec/uframe)\n", 100*uframe_periodic_max/125, uframe_periodic_max); if (uframe_periodic_max != 100) ehci_warn(ehci, "max periodic bandwidth set is non-standard\n"); ehci->uframe_periodic_max = uframe_periodic_max; ret = count; out_unlock: spin_unlock_irqrestore (&ehci->lock, flags); return ret; } static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max); static inline int create_sysfs_files(struct ehci_hcd *ehci) { struct device *controller = ehci_to_hcd(ehci)->self.controller; int i = 0; /* with integrated TT there is no companion! */ if (!ehci_is_TDI(ehci)) i = device_create_file(controller, &dev_attr_companion); if (i) goto out; i = device_create_file(controller, &dev_attr_uframe_periodic_max); out: return i; } static inline void remove_sysfs_files(struct ehci_hcd *ehci) { struct device *controller = ehci_to_hcd(ehci)->self.controller; /* with integrated TT there is no companion! */ if (!ehci_is_TDI(ehci)) device_remove_file(controller, &dev_attr_companion); device_remove_file(controller, &dev_attr_uframe_periodic_max); } 4:28:22 -0800 commit54791b276b4000b307339f269d3bf7db877d536f (patch) tree1c2616bd373ce5ea28aac2a53e32f5b5834901ce /sound/parisc/Makefile parent5d0e7705774dd412a465896d08d59a81a345c1e4 (diff)parent047487241ff59374fded8c477f21453681f5995c (diff)
Merge branch 'sparc64-non-resumable-user-error-recovery'
Liam R. Howlett says: ==================== sparc64: Recover from userspace non-resumable PIO & MEM errors A non-resumable error from userspace is able to cause a kernel panic or trap loop due to the setup and handling of the queued traps once in the kernel. This patch series addresses both of these issues. The queues are fixed by simply zeroing the memory before use. PIO errors from userspace will result in a SIGBUS being sent to the user process. The MEM errors form userspace will result in a SIGKILL and also cause the offending pages to be claimed so they are no longer used in future tasks. SIGKILL is used to ensure that the process does not try to coredump and result in an attempt to read the memory again from within kernel space. Although there is a HV call to scrub the memory (mem_scrub), there is no easy way to guarantee that the real memory address(es) are not used by other tasks. Clearing the error with mem_scrub would zero the memory and cause the other processes to proceed with bad data. The handling of other non-resumable errors remain unchanged and will cause a panic. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'sound/parisc/Makefile')