On Sat, 2006-01-21 at 13:10 +0100, Pavel Machek wrote:
<snip>
>
> Oopsen seems to be called because add_p2p_bridge is never called. I
> think it should be called for this device:
>
> 0000:00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 81)
>
> --- clean-mm//drivers/pci/hotplug/acpiphp_glue.c 2006-01-21 11:38:51.000000000 +0100
> +++ linux-mm/drivers/pci/hotplug/acpiphp_glue.c 2006-01-21 12:53:28.000000000 +0100
> @@ -454,16 +457,22 @@
> return AE_OK;
> }
>
> + printk("ADR ok\n");
> +
> device = (tmp >> 16) & 0xffff;
> function = tmp & 0xffff;
>
> dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
>
> + printk("device, function = %lx\n", tmp);
> +
> if (!dev || !dev->subordinate)
> goto out;
>
> + printk("detect slots\n");
> +
> /* check if this bridge has ejectable slots */
> - if (detect_ejectable_slots(handle) > 0) {
> + if ((tmp == 0x1e0000) || (detect_ejectable_slots(handle) > 0)) {
> dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
> add_p2p_bridge(handle, dev);
> }
>
> ...but then bridge->slots is still empty. I tried forcing
> is_ejectable(), but then I get:
>
> Jan 21 13:09:52 amd kernel: acpiphp: ACPI Hot Plug PCI Controller
> Driver version: 0.5
> Jan 21 13:09:53 amd kernel: add_bridge
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1f0000
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 10000
> Jan 21 13:09:53 amd kernel: detect slots
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1e0000
> Jan 21 13:09:53 amd kernel: detect slots
> Jan 21 13:09:53 amd kernel: acpiphp_glue: found PCI-to-PCI bridge at
> PCI 0000:00:1e.0
> Jan 21 13:09:53 amd kernel: add_p2p_bridge
> Jan 21 13:09:53 amd kernel: acpiphp_glue: _HPP evaluation failed
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1f0001
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1d0000
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1d0001
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1d0002
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1d0007
> Jan 21 13:09:53 amd kernel: find_p2p_bridge
> Jan 21 13:09:53 amd kernel: ADR ok
> Jan 21 13:09:53 amd kernel: device, function = 1f0006
> Jan 21 13:09:53 amd kernel: acpiphp_glue: Bus 0000:02 has 0 slots
> Jan 21 13:09:53 amd kernel: acpiphp_glue: Total 0 slots
> Jan 21 13:10:05 amd pam_limits[1345]: wrong limit value 'unlimited'
>
> Pavel
Well, let's back up a bit. I see a few things wrong. Starting with
just the basics, it doesn't seem like we have even found your _DCK
method, otherwise find_num_slots should have reported 1. If we had been
able to find the dock bridge, then adding the p2p bridge would have
worked as well. Let's debug this problem first - Can you please try
this patch, making sure to load the module with debugging enabled:
modprobe acpiphp debug=1
and then send me the output of dmesg -s 10000? Thanks for helping me
debug, I appreciate it. This patch just adds some extra debugging info
to the code path that I would expect to be taken while trying to find
your _DCK method. Other than that, it is unchanged.
Kristen
drivers/pci/hotplug/acpiphp.h | 11 +
drivers/pci/hotplug/acpiphp_glue.c | 366 +++++++++++++++++++++++++++----------
2 files changed, 284 insertions(+), 93 deletions(-)
--- linux-2.6.16-rc1.orig/drivers/pci/hotplug/acpiphp.h
+++ linux-2.6.16-rc1/drivers/pci/hotplug/acpiphp.h
@@ -148,6 +148,17 @@ struct acpiphp_func {
u32 flags; /* see below */
};
+
+struct acpiphp_dock_bridge {
+ acpi_handle dock_bridge_handle;
+ acpi_handle dck_handle;
+ struct acpiphp_func *func;
+ struct acpiphp_slot *slot;
+ u32 last_dock_time;
+ u32 flags;
+};
+
+
/**
* struct acpiphp_attention_info - device specific attention registration
*
--- linux-2.6.16-rc1.orig/drivers/pci/hotplug/acpiphp_glue.c
+++ linux-2.6.16-rc1/drivers/pci/hotplug/acpiphp_glue.c
@@ -53,15 +53,14 @@
#include "acpiphp.h"
static LIST_HEAD(bridge_list);
+static struct acpiphp_dock_bridge dock_bridge;
#define MY_NAME "acpiphp_glue"
-static struct work_struct dock_task;
static int enable_device(struct acpiphp_slot *slot);
static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
static void handle_hotplug_event_func (acpi_handle, u32, void *);
static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
-static void dock(void *data);
static unsigned int get_slot_status(struct acpiphp_slot *slot);
/*
@@ -104,13 +103,26 @@ static int is_ejectable(acpi_handle hand
}
+
+static int is_dock(acpi_handle handle)
+{
+ acpi_status status;
+ acpi_handle tmp;
+
+ status = acpi_get_handle(handle, "_DCK", &tmp);
+ if (ACPI_FAILURE(status)) {
+ return 0;
+ }
+ return 1;
+}
+
/* callback routine to check the existence of ejectable slots */
static acpi_status
is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
- if (is_ejectable(handle)) {
+ if (is_ejectable(handle) || (handle == dock_bridge.dock_bridge_handle)) {
(*count)++;
/* only one ejectable slot is enough */
return AE_CTRL_TERMINATE;
@@ -120,7 +132,9 @@ is_ejectable_slot(acpi_handle handle, u3
}
-static acpi_status handle_dock(struct acpiphp_func *func, int dock)
+
+
+static acpi_status handle_dock(int dock)
{
acpi_status status;
struct acpi_object_list arg_list;
@@ -134,10 +148,13 @@ static acpi_status handle_dock(struct ac
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = dock;
- status = acpi_evaluate_object(func->handle, "_DCK",
+ status = acpi_evaluate_object(dock_bridge.dck_handle, "_DCK",
&arg_list, &buffer);
if (ACPI_FAILURE(status))
err("%s: failed to dock!!\n", MY_NAME);
+ acpi_os_free(buffer.pointer);
+
+ dbg("%s: exit\n", __FUNCTION__);
return status;
}
@@ -157,6 +174,7 @@ register_slot(acpi_handle handle, u32 lv
int device, function;
static int num_slots = 0; /* XXX if we support I/O node hotplug... */
+
status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
if (ACPI_FAILURE(status))
@@ -164,9 +182,10 @@ register_slot(acpi_handle handle, u32 lv
status = acpi_get_handle(handle, "_EJ0", &tmp);
- if (ACPI_FAILURE(status))
+ if ((handle != dock_bridge.dock_bridge_handle) && ACPI_FAILURE(status))
return AE_OK;
+
device = (adr >> 16) & 0xffff;
function = adr & 0xffff;
@@ -178,7 +197,8 @@ register_slot(acpi_handle handle, u32 lv
INIT_LIST_HEAD(&newfunc->sibling);
newfunc->handle = handle;
newfunc->function = function;
- newfunc->flags = FUNC_HAS_EJ0;
+ if (ACPI_SUCCESS(status))
+ newfunc->flags = FUNC_HAS_EJ0;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
newfunc->flags |= FUNC_HAS_STA;
@@ -189,6 +209,9 @@ register_slot(acpi_handle handle, u32 lv
if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
newfunc->flags |= FUNC_HAS_PS3;
+ if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
+ newfunc->flags |= FUNC_HAS_DCK;
+
status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
if (ACPI_FAILURE(status))
sun = -1;
@@ -236,24 +259,22 @@ register_slot(acpi_handle handle, u32 lv
slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
}
- /* install dock notify handler */
- if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) {
- newfunc->flags |= FUNC_HAS_DCK;
- INIT_WORK(&dock_task, dock, slot);
- }
/* install notify handler */
- status = acpi_install_notify_handler(handle,
+ if (!(newfunc->flags & FUNC_HAS_DCK)) {
+ status = acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func,
newfunc);
-
- if (ACPI_FAILURE(status)) {
- err("failed to register interrupt notify handler\n");
- return status;
+ if (ACPI_FAILURE(status))
+ err("failed to register interrupt notify handler\n");
+ } else if (handle == dock_bridge.dock_bridge_handle) {
+ dock_bridge.func = newfunc;
+ dock_bridge.slot = slot;
+ status = AE_OK;
}
- return AE_OK;
+ return status;
}
@@ -544,11 +565,13 @@ static void cleanup_bridge(struct acpiph
list_for_each_safe (list, tmp, &slot->funcs) {
struct acpiphp_func *func;
func = list_entry(list, struct acpiphp_func, sibling);
- status = acpi_remove_notify_handler(func->handle,
+ if (!(func->flags & FUNC_HAS_DCK)) {
+ status = acpi_remove_notify_handler(func->handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func);
- if (ACPI_FAILURE(status))
- err("failed to remove notify handler\n");
+ if (ACPI_FAILURE(status))
+ err("failed to remove notify handler\n");
+ }
pci_dev_put(func->pci_dev);
list_del(list);
kfree(func);
@@ -713,33 +736,6 @@ static int acpiphp_configure_ioapics(acp
return 0;
}
-/*
- * the _DCK method can do funny things... and sometimes not
- * hah-hah funny.
- */
-static void post_dock_fixups(struct acpiphp_slot *slot,
- struct acpiphp_func *func)
-{
- struct pci_bus *bus = slot->bridge->pci_bus;
- u32 buses;
-
- /* fixup bad _DCK function that rewrites
- * secondary bridge on slot
- */
- pci_read_config_dword(bus->self,
- PCI_PRIMARY_BUS,
- &buses);
-
- if (((buses >> 8) & 0xff) != bus->secondary) {
- buses = (buses & 0xff000000)
- | ((unsigned int)(bus->primary) << 0)
- | ((unsigned int)(bus->secondary) << 8)
- | ((unsigned int)(bus->subordinate) << 16);
- pci_write_config_dword(bus->self,
- PCI_PRIMARY_BUS,
- buses);
- }
-}
static int acpiphp_bus_add(struct acpiphp_func *func)
@@ -771,26 +767,32 @@ static int acpiphp_bus_add(struct acpiph
-static void dock(void *data)
+
+/*
+ * the _DCK method can do funny things... and sometimes not
+ * hah-hah funny.
+ */
+static void post_dock_fixups(void)
{
- struct list_head *l;
- struct acpiphp_func *func;
- struct acpiphp_slot *slot = data;
+ struct pci_bus *bus = dock_bridge.slot->bridge->pci_bus;
+ u32 buses;
- mutex_lock(&slot->crit_sect);
- list_for_each(l, &slot->funcs) {
- func = list_entry(l, struct acpiphp_func, sibling);
- if (func->flags & FUNC_HAS_DCK) {
- handle_dock(func, 1);
- post_dock_fixups(slot, func);
- slot->flags |= SLOT_POWEREDON;
- if (get_slot_status(slot) == ACPI_STA_ALL) {
- enable_device(slot);
- }
- }
+ /* fixup bad _DCK function that rewrites
+ * secondary bridge on slot
+ */
+ pci_read_config_dword(bus->self,
+ PCI_PRIMARY_BUS,
+ &buses);
+
+ if (((buses >> 8) & 0xff) != bus->secondary) {
+ buses = (buses & 0xff000000)
+ | ((unsigned int)(bus->primary) << 0)
+ | ((unsigned int)(bus->secondary) << 8)
+ | ((unsigned int)(bus->subordinate) << 16);
+ pci_write_config_dword(bus->self,
+ PCI_PRIMARY_BUS,
+ buses);
}
- slot->flags &= (~SLOT_DOCKING);
- mutex_unlock(&slot->crit_sect);
}
@@ -819,19 +821,6 @@ static int power_on_slot(struct acpiphp_
} else
break;
}
-
- if (func->flags & FUNC_HAS_DCK) {
- dbg("%s: executing _DCK\n", __FUNCTION__);
- slot->flags |= SLOT_DOCKING;
- /*
- * FIXME - work around for acpi. Right
- * now if we call _DCK from this thread,
- * we block forever.
- */
- schedule_work(&dock_task);
- retval = -1;
- goto err_exit;
- }
}
/* TBD: evaluate _STA to check if the slot is enabled */
@@ -857,11 +846,6 @@ static int power_off_slot(struct acpiphp
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
- if (func->flags & FUNC_HAS_DCK) {
- dbg("%s: undock commencing\n", __FUNCTION__);
- handle_dock(func, 0);
- dbg("%s: undock complete\n", __FUNCTION__);
- }
if (func->flags & FUNC_HAS_PS3) {
status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
if (ACPI_FAILURE(status)) {
@@ -871,6 +855,7 @@ static int power_off_slot(struct acpiphp
} else
break;
}
+
}
/* TBD: evaluate _STA to check if the slot is disabled */
@@ -882,6 +867,8 @@ static int power_off_slot(struct acpiphp
}
+
+
/**
* get_func - given pci_dev & slot, get the matching acpiphp_func
* @slot: slot to be scanned.
@@ -889,22 +876,27 @@ static int power_off_slot(struct acpiphp
*
* This function will check the list of acpiphp functions for
* this slot and return the one that represents the given
- * pci_dev structure.
+ * pci_dev structure. This function will incremente the ref
+ * pointer of the pci_dev struct as a side effect, so the caller
+ * must call pci_dev_put when they are done.
*/
static struct acpiphp_func * get_func(struct acpiphp_slot *slot,
struct pci_dev *dev)
{
- struct list_head *l;
- struct acpiphp_func *func;
+ struct acpiphp_func *func = NULL;
struct pci_bus *bus = slot->bridge->pci_bus;
+ struct pci_dev *pdev;
- list_for_each (l, &slot->funcs) {
- func = list_entry(l, struct acpiphp_func, sibling);
- if (pci_get_slot(bus, PCI_DEVFN(slot->device,
- func->function)) == dev)
- return func;
+ list_for_each_entry (func, &slot->funcs, sibling) {
+ pdev = pci_get_slot(bus, PCI_DEVFN(slot->device,
+ func->function));
+ if (pdev) {
+ if (pdev == dev)
+ break;
+ pci_dev_put(pdev);
+ }
}
- return NULL;
+ return func;
}
@@ -987,8 +979,11 @@ static int enable_device(struct acpiphp_
if (pass && dev->subordinate) {
pci_bus_size_bridges(dev->subordinate);
func = get_func(slot, dev);
- if (func)
+ if (func) {
acpiphp_bus_add(func);
+ /* side effect of get_func() */
+ pci_dev_put(dev);
+ }
}
}
}
@@ -1306,6 +1301,7 @@ static void handle_bridge_insertion(acpi
* ACPI event handlers
*/
+
/**
* handle_hotplug_event_bridge - handle ACPI event on bridges
*
@@ -1439,6 +1435,47 @@ static void handle_hotplug_event_func(ac
}
}
+
+
+static void
+handle_hotplug_event_dock(acpi_handle handle, u32 type, void *context)
+{
+ acpi_handle dock = dock_bridge.dock_bridge_handle;
+
+ switch (type) {
+ case ACPI_NOTIFY_BUS_CHECK:
+ dbg("%s: Bus check notify\n",
+ __FUNCTION__);
+ dock_bridge.flags |= SLOT_DOCKING;
+ handle_dock(1);
+ if (dock) {
+ post_dock_fixups();
+ handle_hotplug_event_func(dock,
+ type, dock_bridge.func);
+ }
+ dock_bridge.flags &= ~(SLOT_DOCKING);
+ dock_bridge.last_dock_time = jiffies;
+ break;
+ case ACPI_NOTIFY_EJECT_REQUEST:
+ if (dock_bridge.flags & SLOT_DOCKING ||
+ dock_bridge.last_dock_time == jiffies) {
+ dbg("%s: Ignore bogus eject request\n",
+ __FUNCTION__);
+ } else {
+ dbg("%s: Eject notify\n", __FUNCTION__);
+ handle_dock(0);
+ handle_hotplug_event_func(dock,
+ type, dock_bridge.func);
+ }
+ break;
+ default:
+ warn("%s: unknown event type 0x%x\n",
+ __FUNCTION__, type);
+ }
+}
+
+
+
static int is_root_bridge(acpi_handle handle)
{
acpi_status status;
@@ -1468,6 +1505,130 @@ static int is_root_bridge(acpi_handle ha
return 0;
}
+
+static acpi_status
+find_dock_ejd(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ acpi_status status;
+ acpi_handle tmp;
+ acpi_handle dck_handle = (acpi_handle) context;
+ char objname[64];
+ char ejd_objname[64];
+ struct acpi_buffer buffer = { .length = sizeof(objname),
+ .pointer = objname };
+ struct acpi_buffer ejd_buffer = { .length = sizeof(ejd_objname),
+ .pointer = ejd_objname };
+ union acpi_object *ejd_obj;
+ union acpi_object *dck_obj;
+
+ dbg("%s: enter\n", __FUNCTION__);
+
+ status = acpi_get_handle(handle, "_EJD", &tmp);
+ if (ACPI_FAILURE(status)) {
+ dbg("%s: no _EJD methods found\n", __FUNCTION__);
+ return 0;
+ }
+
+ /* make sure we are dependent on the dock device */
+ acpi_get_name(dck_handle, ACPI_FULL_PATHNAME, &buffer);
+ status = acpi_evaluate_object(handle, "_EJD", NULL, &ejd_buffer);
+ if (ACPI_FAILURE(status)) {
+ err("Unable to execute _EJD!\n");
+ return 0;
+ }
+
+ ejd_obj = ejd_buffer.pointer;
+ dck_obj = buffer.pointer;
+ if (!strncmp(ejd_obj->string.pointer, dck_obj->string.pointer,
+ ejd_obj->string.length)) {
+ dbg("%s: found device dependent on dock\n", __FUNCTION__);
+ /* ok, this device is dependent on the dock device,
+ * if it was the actual dock bridge, it would have
+ * a PRT associated with it.
+ */
+ status = acpi_get_handle(handle, "_PRT", &tmp);
+ if (ACPI_FAILURE(status))
+ return 0;
+
+ /* yippee, we found the dock bridge! */
+ dbg("%s: found dock bridge\n", __FUNCTION__);
+ *(rv) = handle;
+ return AE_CTRL_TERMINATE;
+ }
+ return AE_OK;
+}
+
+
+static acpi_handle
+get_dock_handle(acpi_handle handle)
+{
+ acpi_handle dock_bridge_handle = NULL;
+
+ dbg("%s: enter\n", __FUNCTION__);
+
+ /*
+ * first see if we are the dock bridge.
+ */
+ if (is_ejectable(handle))
+ return handle;
+
+ dbg("%s: not ejectable\n", __FUNCTION__);
+
+ /*
+ * otherwise, we are going to have to find
+ * the dock bridge by checking the _EJD list.
+ */
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX, find_dock_ejd, handle, &dock_bridge_handle);
+
+ return dock_bridge_handle;
+}
+
+
+
+static acpi_status
+find_dock(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ int *count = (int *)context;
+
+ dbg("%s: enter\n", __FUNCTION__);
+
+ if (is_dock(handle)) {
+ /* found a dock. Now we have to determine if
+ * the _DCK method is within the scope of the
+ * dock bridge, or outside it (as in the IBM x-series)
+ */
+ dbg("%s: found dock\n", __FUNCTION__);
+ dock_bridge.dock_bridge_handle = get_dock_handle(handle);
+ dock_bridge.dck_handle = handle;
+ acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ handle_hotplug_event_dock, NULL);
+ (*count)++;
+ }
+
+ return AE_OK;
+}
+
+
+
+
+static int
+find_dock_bridge(void)
+{
+ int num = 0;
+
+ /* start from the root object, because some laptops define
+ * _DCK methods outside the scope of PCI (IBM x-series laptop)
+ */
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX, find_dock, &num, NULL);
+
+ return num;
+}
+
+
+
+
static acpi_status
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
@@ -1494,6 +1655,8 @@ int __init acpiphp_glue_init(void)
{
int num = 0;
+ num = find_dock_bridge();
+
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
@@ -1513,6 +1676,17 @@ int __init acpiphp_glue_init(void)
*/
void __exit acpiphp_glue_exit(void)
{
+ acpi_handle handle = dock_bridge.dck_handle;
+
+ /* if we have a dock station handle, we should
+ * remove the notify handler
+ */
+ if (handle) {
+ if (ACPI_FAILURE(acpi_remove_notify_handler(handle,
+ ACPI_SYSTEM_NOTIFY, handle_hotplug_event_dock)))
+ err("failed to remove dock notify handler\n");
+ }
+
acpi_pci_unregister_driver(&acpi_pci_hp_driver);
}
@@ -1537,6 +1711,12 @@ int __init acpiphp_get_num_slots(void)
num_slots += bridge->nr_slots;
}
+ /* it's possible to have a dock station that doesn't actually
+ * use a pci dock bridge. For now, continue to allow this
+ * to be handled by this driver.
+ */
+ if (dock_bridge.dck_handle && !dock_bridge.dock_bridge_handle)
+ num_slots++;
dbg("Total %d slots\n", num_slots);
return num_slots;
}
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