Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 499 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/acpiphp_ibm.c b/drivers/pci/hotplug/acpiphp_ibm.c
new file mode 100644
index 000000000000..7e7f913ba7b9
--- /dev/null
+++ b/drivers/pci/hotplug/acpiphp_ibm.c
@@ -0,0 +1,499 @@
+/*
+ * ACPI PCI Hot Plug IBM Extension
+ *
+ * Copyright (C) 2004 Vernon Mauery <vernux@us.ibm.com>
+ * Copyright (C) 2004 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * 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, GOOD TITLE or
+ * NON INFRINGEMENT.  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.
+ *
+ * Send feedback to <vernux@us.ibm.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <acpi/acpi_bus.h>
+#include <linux/sysfs.h>
+#include <linux/kobject.h>
+#include <asm/uaccess.h>
+#include <linux/moduleparam.h>
+
+#include "acpiphp.h"
+#include "pci_hotplug.h"
+
+#define DRIVER_VERSION  "1.0.1"
+#define DRIVER_AUTHOR   "Irene Zubarev <zubarev@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
+#define DRIVER_DESC     "ACPI Hot Plug PCI Controller Driver IBM extension"
+
+static int debug;
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRIVER_VERSION);
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, " Debugging mode enabled or not");
+#define MY_NAME "acpiphp_ibm"
+
+#undef dbg
+#define dbg(format, arg...)                             \
+do {                                                    \
+        if (debug)                                      \
+                printk(KERN_DEBUG "%s: " format,        \
+                                MY_NAME , ## arg);      \
+} while (0)
+
+#define FOUND_APCI 0x61504349
+/* these are the names for the IBM ACPI pseudo-device */
+#define IBM_HARDWARE_ID1 "IBM37D0"
+#define IBM_HARDWARE_ID2 "IBM37D4"
+
+#define hpslot_to_sun(A) (((struct slot *)((A)->private))->acpi_slot->sun)
+
+/* union apci_descriptor - allows access to the
+ * various device descriptors that are embedded in the
+ * aPCI table
+ */
+union apci_descriptor {
+        struct {
+                char sig[4];
+                u8   len;
+        } header;
+        struct {
+                u8  type;
+                u8  len;
+                u16 slot_id;
+                u8  bus_id;
+                u8  dev_num;
+                u8  slot_num;
+                u8  slot_attr[2];
+                u8  attn;
+                u8  status[2];
+                u8  sun;
+                u8  res[3];
+        } slot;
+        struct {
+                u8 type;
+                u8 len;
+        } generic;
+};
+
+/* struct notification - keeps info about the device
+ * that cause the ACPI notification event
+ */
+struct notification {
+        struct acpi_device *device;
+        u8                  event;
+};
+
+static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status);
+static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status);
+static void ibm_handle_events(acpi_handle handle, u32 event, void *context);
+static int ibm_get_table_from_acpi(char **bufp);
+static ssize_t ibm_read_apci_table(struct kobject *kobj,
+                char *buffer, loff_t pos, size_t size);
+static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
+                u32 lvl, void *context, void **rv);
+static int __init ibm_acpiphp_init(void);
+static void __exit ibm_acpiphp_exit(void);
+
+static acpi_handle ibm_acpi_handle;
+static struct notification ibm_note;
+static struct bin_attribute ibm_apci_table_attr = {
+            .attr = {
+                    .name = "apci_table",
+                    .owner = THIS_MODULE,
+                    .mode = S_IRUGO,
+            },
+            .read = ibm_read_apci_table,
+            .write = NULL,
+};
+static struct acpiphp_attention_info ibm_attention_info = 
+{
+        .set_attn = ibm_set_attention_status,
+        .get_attn = ibm_get_attention_status,
+        .owner = THIS_MODULE,
+};
+
+/**
+ * ibm_slot_from_id - workaround for bad ibm hardware
+ * @id: the slot number that linux refers to the slot by
+ *
+ * Description: this method returns the aCPI slot descriptor
+ * corresponding to the Linux slot number.  This descriptor
+ * has info about the aPCI slot id and attention status.
+ * This descriptor must be freed using kfree when done.
+ **/
+static union apci_descriptor *ibm_slot_from_id(int id)
+{
+        int ind = 0, size;
+        union apci_descriptor *ret = NULL, *des;
+        char *table;
+
+        size = ibm_get_table_from_acpi(&table);
+        des = (union apci_descriptor *)table;
+        if (memcmp(des->header.sig, "aPCI", 4) != 0)
+                goto ibm_slot_done;
+
+        des = (union apci_descriptor *)&table[ind += des->header.len];
+        while (ind < size && (des->generic.type != 0x82 ||
+                        des->slot.slot_num != id)) {
+                des = (union apci_descriptor *)&table[ind += des->generic.len];
+        }
+
+        if (ind < size && des->slot.slot_num == id)
+                ret = des;
+
+ibm_slot_done:
+        if (ret) {
+                ret = kmalloc(sizeof(union apci_descriptor), GFP_KERNEL);
+                memcpy(ret, des, sizeof(union apci_descriptor));
+        }
+        kfree(table);
+        return ret;
+}
+
+/**
+ * ibm_set_attention_status - callback method to set the attention LED
+ * @slot: the hotplug_slot to work with
+ * @status: what to set the LED to (0 or 1)
+ *
+ * Description: this method is registered with the acpiphp module as a
+ * callback to do the device specific task of setting the LED status
+ **/
+static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status)
+{
+        union acpi_object args[2]; 
+        struct acpi_object_list params = { .pointer = args, .count = 2 };
+        acpi_status stat; 
+        unsigned long rc;
+        union apci_descriptor *ibm_slot;
+
+        ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot));
+
+        dbg("%s: set slot %d (%d) attention status to %d\n", __FUNCTION__,
+                        ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
+                        (status ? 1 : 0));
+
+        args[0].type = ACPI_TYPE_INTEGER;
+        args[0].integer.value = ibm_slot->slot.slot_id;
+        args[1].type = ACPI_TYPE_INTEGER;
+        args[1].integer.value = (status) ? 1 : 0;
+
+        kfree(ibm_slot);
+
+        stat = acpi_evaluate_integer(ibm_acpi_handle, "APLS", &params, &rc);
+        if (ACPI_FAILURE(stat)) {
+                err("APLS evaluation failed:  0x%08x\n", stat);
+                return -ENODEV;
+        } else if (!rc) {
+                err("APLS method failed:  0x%08lx\n", rc);
+                return -ERANGE;
+        }
+        return 0;
+}
+
+/**
+ * ibm_get_attention_status - callback method to get attention LED status
+ * @slot: the hotplug_slot to work with
+ * @status: returns what the LED is set to (0 or 1)
+ *
+ * Description: this method is registered with the acpiphp module as a
+ * callback to do the device specific task of getting the LED status
+ * 
+ * Because there is no direct method of getting the LED status directly
+ * from an ACPI call, we read the aPCI table and parse out our
+ * slot descriptor to read the status from that.
+ **/
+static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status)
+{
+        union apci_descriptor *ibm_slot;
+
+        ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot));
+
+        if (ibm_slot->slot.attn & 0xa0 || ibm_slot->slot.status[1] & 0x08)
+                *status = 1;
+        else
+                *status = 0;
+
+        dbg("%s: get slot %d (%d) attention status is %d\n", __FUNCTION__,
+                        ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
+                        *status);
+
+        kfree(ibm_slot);
+        return 0;
+}
+
+/**
+ * ibm_handle_events - listens for ACPI events for the IBM37D0 device
+ * @handle: an ACPI handle to the device that caused the event
+ * @event: the event info (device specific)
+ * @context: passed context (our notification struct)
+ *
+ * Description: this method is registered as a callback with the ACPI
+ * subsystem it is called when this device has an event to notify the OS of
+ *
+ * The events actually come from the device as two events that get
+ * synthesized into one event with data by this function.  The event
+ * ID comes first and then the slot number that caused it.  We report
+ * this as one event to the OS.
+ *
+ * From section 5.6.2.2 of the ACPI 2.0 spec, I understand that the OSPM will
+ * only re-enable the interrupt that causes this event AFTER this method
+ * has returned, thereby enforcing serial access for the notification struct.
+ **/
+static void ibm_handle_events(acpi_handle handle, u32 event, void *context)
+{
+        u8 detail = event & 0x0f;
+        u8 subevent = event & 0xf0;
+        struct notification *note = context;
+
+        dbg("%s: Received notification %02x\n", __FUNCTION__, event);
+
+        if (subevent == 0x80) {
+                dbg("%s: generationg bus event\n", __FUNCTION__);
+                acpi_bus_generate_event(note->device, note->event, detail);
+        } else
+                note->event = event;
+}
+
+/**
+ * ibm_get_table_from_acpi - reads the APLS buffer from ACPI
+ * @bufp: address to pointer to allocate for the table
+ *
+ * Description: this method reads the APLS buffer in from ACPI and
+ * stores the "stripped" table into a single buffer
+ * it allocates and passes the address back in bufp
+ *
+ * If NULL is passed in as buffer, this method only calculates
+ * the size of the table and returns that without filling
+ * in the buffer
+ *
+ * returns < 0 on error or the size of the table on success
+ **/
+static int ibm_get_table_from_acpi(char **bufp)
+{
+        union acpi_object *package;
+        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+        acpi_status status;
+        char *lbuf = NULL;
+        int i, size = -EIO;
+
+        status = acpi_evaluate_object(ibm_acpi_handle, "APCI", NULL, &buffer);
+        if (ACPI_FAILURE(status)) {
+                err("%s:  APCI evaluation failed\n", __FUNCTION__);
+                return -ENODEV;
+        }
+
+        package = (union acpi_object *) buffer.pointer;
+        if(!(package) ||
+                        (package->type != ACPI_TYPE_PACKAGE) ||
+                        !(package->package.elements)) {
+                err("%s:  Invalid APCI object\n", __FUNCTION__);
+                goto read_table_done;
+        }
+
+        for(size = 0, i = 0; i < package->package.count; i++) {
+                if (package->package.elements[i].type != ACPI_TYPE_BUFFER) {
+                        err("%s:  Invalid APCI element %d\n", __FUNCTION__, i);
+                        goto read_table_done;
+                }
+                size += package->package.elements[i].buffer.length;
+        }
+
+        if (bufp == NULL)
+                goto read_table_done;
+
+        lbuf = kmalloc(size, GFP_KERNEL);
+        dbg("%s: element count: %i, ASL table size: %i, &table = 0x%p\n",
+                        __FUNCTION__, package->package.count, size, lbuf);
+
+        if (lbuf) {
+                *bufp = lbuf;
+                memset(lbuf, 0, size);
+        } else {
+                size = -ENOMEM;
+                goto read_table_done;
+        }
+
+        size = 0;
+        for (i=0; i<package->package.count; i++) {
+                memcpy(&lbuf[size],
+                                package->package.elements[i].buffer.pointer,
+                                package->package.elements[i].buffer.length);
+                size += package->package.elements[i].buffer.length;
+        }
+
+read_table_done:
+        kfree(buffer.pointer);
+        return size;
+}
+
+/**
+ * ibm_read_apci_table - callback for the sysfs apci_table file
+ * @kobj: the kobject this binary attribute is a part of
+ * @buffer: the kernel space buffer to fill
+ * @pos: the offset into the file
+ * @size: the number of bytes requested
+ *
+ * Description: gets registered with sysfs as the reader callback
+ * to be executed when /sys/bus/pci/slots/apci_table gets read
+ *
+ * Since we don't get notified on open and close for this file,
+ * things get really tricky here...
+ * our solution is to only allow reading the table in all at once
+ **/
+static ssize_t ibm_read_apci_table(struct kobject *kobj,
+                char *buffer, loff_t pos, size_t size)
+{
+        int bytes_read = -EINVAL;
+        char *table = NULL;
+        
+        dbg("%s: pos = %d, size = %zd\n", __FUNCTION__, (int)pos, size);
+
+        if (pos == 0) {
+                bytes_read = ibm_get_table_from_acpi(&table);
+                if (bytes_read > 0 && bytes_read <= size)
+                        memcpy(buffer, table, bytes_read);
+                kfree(table);
+        }
+        return bytes_read;
+}
+
+/**
+ * ibm_find_acpi_device - callback to find our ACPI device
+ * @handle: the ACPI handle of the device we are inspecting
+ * @lvl: depth into the namespace tree
+ * @context: a pointer to our handle to fill when we find the device
+ * @rv: a return value to fill if desired
+ *
+ * Description: used as a callback when calling acpi_walk_namespace
+ * to find our device.  When this method returns non-zero
+ * acpi_walk_namespace quits its search and returns our value
+ **/
+static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
+                u32 lvl, void *context, void **rv)
+{
+        acpi_handle *phandle = (acpi_handle *)context;
+        acpi_status status; 
+        struct acpi_device_info info; 
+        struct acpi_buffer info_buffer = {
+                .length = sizeof(struct acpi_device_info),
+                .pointer = &info,
+        };
+
+        status = acpi_get_object_info(handle, &info_buffer);
+        if (ACPI_FAILURE(status)) {
+                err("%s:  Failed to get device information", __FUNCTION__);
+                return 0;
+        }
+        info.hardware_id.value[sizeof(info.hardware_id.value) - 1] = '\0';
+
+        if(info.current_status && (info.valid & ACPI_VALID_HID) &&
+                        (!strcmp(info.hardware_id.value, IBM_HARDWARE_ID1) ||
+                        !strcmp(info.hardware_id.value, IBM_HARDWARE_ID2))) {
+                dbg("found hardware: %s, handle: %p\n", info.hardware_id.value,
+                                handle);
+                *phandle = handle;
+                /* returning non-zero causes the search to stop
+                 * and returns this value to the caller of 
+                 * acpi_walk_namespace, but it also causes some warnings
+                 * in the acpi debug code to print...
+                 */
+                return FOUND_APCI;
+        }
+        return 0;
+}
+
+static int __init ibm_acpiphp_init(void)
+{
+        int retval = 0;
+        acpi_status status;
+        struct acpi_device *device;
+        struct kobject *sysdir = &pci_hotplug_slots_subsys.kset.kobj;
+
+        dbg("%s\n", __FUNCTION__);
+
+        if (acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+                        ACPI_UINT32_MAX, ibm_find_acpi_device,
+                        &ibm_acpi_handle, NULL) != FOUND_APCI) {
+                err("%s: acpi_walk_namespace failed\n", __FUNCTION__);
+                retval = -ENODEV;
+                goto init_return;
+        }
+        dbg("%s: found IBM aPCI device\n", __FUNCTION__);
+        if (acpi_bus_get_device(ibm_acpi_handle, &device)) {
+                err("%s: acpi_bus_get_device failed\n", __FUNCTION__);
+                retval = -ENODEV;
+                goto init_return;
+        }
+        if (acpiphp_register_attention(&ibm_attention_info)) {
+                retval = -ENODEV;
+                goto init_return;
+        }
+
+        ibm_note.device = device;
+        status = acpi_install_notify_handler(
+                        ibm_acpi_handle,
+                        ACPI_DEVICE_NOTIFY,
+                        ibm_handle_events,
+                        &ibm_note);
+        if (ACPI_FAILURE(status)) {
+                err("%s:  Failed to register notification handler\n",
+                                __FUNCTION__);
+                retval = -EBUSY;
+                goto init_cleanup;
+        }
+
+        ibm_apci_table_attr.size = ibm_get_table_from_acpi(NULL);
+        retval = sysfs_create_bin_file(sysdir, &ibm_apci_table_attr);
+
+        return retval;
+
+init_cleanup:
+        acpiphp_unregister_attention(&ibm_attention_info);
+init_return:
+        return retval;
+}
+
+static void __exit ibm_acpiphp_exit(void)
+{
+        acpi_status status;
+        struct kobject *sysdir = &pci_hotplug_slots_subsys.kset.kobj;
+
+        dbg("%s\n", __FUNCTION__);
+
+        if (acpiphp_unregister_attention(&ibm_attention_info))
+                err("%s: attention info deregistration failed", __FUNCTION__);
+
+           status = acpi_remove_notify_handler(
+                           ibm_acpi_handle,
+                           ACPI_DEVICE_NOTIFY,
+                           ibm_handle_events);
+           if (ACPI_FAILURE(status))
+                   err("%s:  Notification handler removal failed\n",
+                                   __FUNCTION__);
+        // remove the /sys entries
+        if (sysfs_remove_bin_file(sysdir, &ibm_apci_table_attr))
+                err("%s: removal of sysfs file apci_table failed\n",
+                                __FUNCTION__);
+}
+
+module_init(ibm_acpiphp_init);
+module_exit(ibm_acpiphp_exit);