[PATCH] shpchp: remove redundant data structures
State information is currently stored in per-slot as well as
per-pci-function data structures in shpchp. There's a lot of
overlap in the information kept, and some of it is never used.
This patch consolidates the state information to per-slot and
eliminates unused data structures. The biggest change is to
eliminate the pci_func structure and the code around managing
its lists.
Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c
index c55103f..b6fde35 100644
--- a/drivers/pci/hotplug/shpchp_ctrl.c
+++ b/drivers/pci/hotplug/shpchp_ctrl.c
@@ -54,19 +54,16 @@
struct slot *p_slot;
u8 rc = 0;
u8 getstatus;
- struct pci_func *func;
struct event_info *taskInfo;
/* Attention Button Change */
dbg("shpchp: Attention button interrupt received.\n");
- func = shpchp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
-
/* This is the structure that tells the worker thread what to do */
taskInfo = &(ctrl->event_queue[ctrl->next_event]);
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
- p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
+ p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
ctrl->next_event = (ctrl->next_event + 1) % 10;
@@ -111,14 +108,11 @@
struct slot *p_slot;
u8 rc = 0;
u8 getstatus;
- struct pci_func *func;
struct event_info *taskInfo;
/* Switch Change */
dbg("shpchp: Switch interrupt received.\n");
- func = shpchp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
-
/* This is the structure that tells the worker thread
* what to do
*/
@@ -128,19 +122,18 @@
rc++;
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
- p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
+ p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
dbg("%s: Card present %x Power status %x\n", __FUNCTION__,
- func->presence_save, func->pwr_save);
+ p_slot->presence_save, p_slot->pwr_save);
if (getstatus) {
/*
* Switch opened
*/
info("Latch open on Slot(%d)\n", ctrl->first_slot + hp_slot);
- func->switch_save = 0;
taskInfo->event_type = INT_SWITCH_OPEN;
- if (func->pwr_save && func->presence_save) {
+ if (p_slot->pwr_save && p_slot->presence_save) {
taskInfo->event_type = INT_POWER_FAULT;
err("Surprise Removal of card\n");
}
@@ -149,7 +142,6 @@
* Switch closed
*/
info("Latch close on Slot(%d)\n", ctrl->first_slot + hp_slot);
- func->switch_save = 0x10;
taskInfo->event_type = INT_SWITCH_CLOSE;
}
@@ -165,14 +157,11 @@
struct slot *p_slot;
u8 rc = 0;
/*u8 temp_byte;*/
- struct pci_func *func;
struct event_info *taskInfo;
/* Presence Change */
dbg("shpchp: Presence/Notify input change.\n");
- func = shpchp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
-
/* This is the structure that tells the worker thread
* what to do
*/
@@ -186,8 +175,8 @@
/*
* Save the presence state
*/
- p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
- if (func->presence_save) {
+ p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
+ if (p_slot->presence_save) {
/*
* Card Present
*/
@@ -212,14 +201,11 @@
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u8 rc = 0;
- struct pci_func *func;
struct event_info *taskInfo;
/* Power fault */
dbg("shpchp: Power fault interrupt received.\n");
- func = shpchp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
-
/* This is the structure that tells the worker thread
* what to do
*/
@@ -235,7 +221,7 @@
* Power fault Cleared
*/
info("Power fault cleared on Slot(%d)\n", ctrl->first_slot + hp_slot);
- func->status = 0x00;
+ p_slot->status = 0x00;
taskInfo->event_type = INT_POWER_FAULT_CLEAR;
} else {
/*
@@ -244,7 +230,7 @@
info("Power fault on Slot(%d)\n", ctrl->first_slot + hp_slot);
taskInfo->event_type = INT_POWER_FAULT;
/* set power fault status for this board */
- func->status = 0xFF;
+ p_slot->status = 0xFF;
info("power fault bit %x set\n", hp_slot);
}
if (rc)
@@ -253,179 +239,6 @@
return rc;
}
-/**
- * shpchp_slot_create - Creates a node and adds it to the proper bus.
- * @busnumber - bus where new node is to be located
- *
- * Returns pointer to the new node or NULL if unsuccessful
- */
-struct pci_func *shpchp_slot_create(u8 busnumber)
-{
- struct pci_func *new_slot;
- struct pci_func *next;
-
- new_slot = kmalloc(sizeof(*new_slot), GFP_KERNEL);
-
- if (new_slot == NULL) {
- return(new_slot);
- }
-
- memset(new_slot, 0, sizeof(struct pci_func));
-
- new_slot->next = NULL;
- new_slot->configured = 1;
-
- if (shpchp_slot_list[busnumber] == NULL) {
- shpchp_slot_list[busnumber] = new_slot;
- } else {
- next = shpchp_slot_list[busnumber];
- while (next->next != NULL)
- next = next->next;
- next->next = new_slot;
- }
- return(new_slot);
-}
-
-
-/*
- * slot_remove - Removes a node from the linked list of slots.
- * @old_slot: slot to remove
- *
- * Returns 0 if successful, !0 otherwise.
- */
-static int slot_remove(struct pci_func * old_slot)
-{
- struct pci_func *next;
-
- if (old_slot == NULL)
- return(1);
-
- next = shpchp_slot_list[old_slot->bus];
-
- if (next == NULL) {
- return(1);
- }
-
- if (next == old_slot) {
- shpchp_slot_list[old_slot->bus] = old_slot->next;
- kfree(old_slot);
- return(0);
- }
-
- while ((next->next != old_slot) && (next->next != NULL)) {
- next = next->next;
- }
-
- if (next->next == old_slot) {
- next->next = old_slot->next;
- kfree(old_slot);
- return(0);
- } else
- return(2);
-}
-
-
-/**
- * bridge_slot_remove - Removes a node from the linked list of slots.
- * @bridge: bridge to remove
- * @secondaryBus: secondary PCI bus number for bridge being removed
- * @subordinateBus: subordinate PCI bus number for bridge being removed
- *
- * Returns 0 if successful, !0 otherwise.
- */
-static int bridge_slot_remove(struct pci_func *bridge, u8 secondaryBus,
- u8 subordinateBus)
-{
- u8 tempBus;
- struct pci_func *next;
-
- if (bridge == NULL)
- return(1);
-
- for (tempBus = secondaryBus; tempBus <= subordinateBus; tempBus++) {
- next = shpchp_slot_list[tempBus];
-
- while (!slot_remove(next)) {
- next = shpchp_slot_list[tempBus];
- }
- }
-
- next = shpchp_slot_list[bridge->bus];
-
- if (next == NULL) {
- return(1);
- }
-
- if (next == bridge) {
- shpchp_slot_list[bridge->bus] = bridge->next;
- kfree(bridge);
- return(0);
- }
-
- while ((next->next != bridge) && (next->next != NULL)) {
- next = next->next;
- }
-
- if (next->next == bridge) {
- next->next = bridge->next;
- kfree(bridge);
- return(0);
- } else
- return(2);
-}
-
-
-/**
- * shpchp_slot_find - Looks for a node by bus, and device, multiple functions accessed
- * @bus: bus to find
- * @device: device to find
- * @index: is 0 for first function found, 1 for the second...
- *
- * Returns pointer to the node if successful, %NULL otherwise.
- */
-struct pci_func *shpchp_slot_find(u8 bus, u8 device, u8 index)
-{
- int found = -1;
- struct pci_func *func;
-
- func = shpchp_slot_list[bus];
-
- if ((func == NULL) || ((func->device == device) && (index == 0)))
- return(func);
-
- if (func->device == device)
- found++;
-
- while (func->next != NULL) {
- func = func->next;
-
- if (func->device == device)
- found++;
-
- if (found == index)
- return(func);
- }
-
- return(NULL);
-}
-
-static int is_bridge(struct pci_func *func, struct controller *ctrl)
-{
- u8 hdr_type;
- struct pci_bus *bus = ctrl->pci_dev->subordinate;
-
- /*
- * Note: device may have just been hot-added and not yet scanned
- * by the pci core, so its pci_dev structure may not exist yet
- */
- pci_bus_read_config_byte(bus, PCI_DEVFN(func->device, func->function),
- PCI_HEADER_TYPE, &hdr_type);
- if ((hdr_type & 0x7f) == PCI_HEADER_TYPE_BRIDGE)
- return 1;
- else
- return 0;
-}
-
/* The following routines constitute the bulk of the
hotplug controller logic
*/
@@ -495,19 +308,20 @@
* Configures board
*
*/
-static u32 board_added(struct pci_func * func, struct controller * ctrl)
+static u32 board_added(struct slot *p_slot)
{
u8 hp_slot;
u8 slots_not_empty = 0;
u32 rc = 0;
- struct slot *p_slot;
enum pci_bus_speed adapter_speed, bus_speed, max_bus_speed;
u8 pi, mode;
+ struct controller *ctrl = p_slot->ctrl;
- p_slot = shpchp_find_slot(ctrl, func->device);
- hp_slot = func->device - ctrl->slot_device_offset;
+ hp_slot = p_slot->device - ctrl->slot_device_offset;
- dbg("%s: func->device, slot_offset, hp_slot = %d, %d ,%d\n", __FUNCTION__, func->device, ctrl->slot_device_offset, hp_slot);
+ dbg("%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
+ __FUNCTION__, p_slot->device,
+ ctrl->slot_device_offset, hp_slot);
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
@@ -699,13 +513,13 @@
wait_for_ctrl_irq (ctrl);
dbg("%s: after long_delay\n", __FUNCTION__);
- dbg("%s: func status = %x\n", __FUNCTION__, func->status);
+ dbg("%s: slot status = %x\n", __FUNCTION__, p_slot->status);
/* Check for a power fault */
- if (func->status == 0xFF) {
+ if (p_slot->status == 0xFF) {
/* power fault occurred, but it was benign */
dbg("%s: power fault\n", __FUNCTION__);
rc = POWER_FAILURE;
- func->status = 0;
+ p_slot->status = 0;
goto err_exit;
}
@@ -715,10 +529,9 @@
goto err_exit;
}
- func->status = 0;
- func->switch_save = 0x10;
- func->is_a_board = 0x01;
- func->pwr_save = 1;
+ p_slot->status = 0;
+ p_slot->is_a_board = 0x01;
+ p_slot->pwr_save = 1;
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
@@ -767,38 +580,23 @@
* remove_board - Turns off slot and LED's
*
*/
-static u32 remove_board(struct pci_func *func, struct controller *ctrl)
+static u32 remove_board(struct slot *p_slot)
{
- u8 device;
+ struct controller *ctrl = p_slot->ctrl;
u8 hp_slot;
u32 rc;
- struct slot *p_slot;
- u8 secondary = 0, subordinate = 0;
- int remove_bridge;
- if (func == NULL)
+ if (shpchp_unconfigure_device(p_slot))
return(1);
- if ((remove_bridge = is_bridge(func, ctrl))) {
- /* Stash away bus information before we destroy it */
- secondary = func->pci_dev->subordinate->secondary;
- subordinate = func->pci_dev->subordinate->subordinate;
- }
-
- if (shpchp_unconfigure_device(func))
- return(1);
-
- device = func->device;
-
- hp_slot = func->device - ctrl->slot_device_offset;
+ hp_slot = p_slot->device - ctrl->slot_device_offset;
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
/* Change status to shutdown */
- if (func->is_a_board)
- func->status = 0x01;
- func->configured = 0;
+ if (p_slot->is_a_board)
+ p_slot->status = 0x01;
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
@@ -835,36 +633,8 @@
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
- if (ctrl->add_support) {
- while (func) {
- if (remove_bridge) {
- dbg("PCI Bridge Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n", ctrl->seg, func->bus,
- func->device, func->function);
- bridge_slot_remove(func, secondary,
- subordinate);
- } else
- dbg("PCI Function Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n", ctrl->seg, func->bus,
- func->device, func->function);
- slot_remove(func);
-
- func = shpchp_slot_find(ctrl->slot_bus, device, 0);
- }
-
- /* Setup slot structure with entry for empty slot */
- func = shpchp_slot_create(ctrl->slot_bus);
-
- if (func == NULL) {
- return(1);
- }
-
- func->bus = ctrl->slot_bus;
- func->device = device;
- func->function = 0;
- func->configured = 0;
- func->switch_save = 0x10;
- func->pwr_save = 0;
- func->is_a_board = 0;
- }
+ p_slot->pwr_save = 0;
+ p_slot->is_a_board = 0;
return 0;
}
@@ -1006,7 +776,6 @@
{
int loop = 0;
int change = 1;
- struct pci_func *func;
u8 hp_slot;
u8 getstatus;
struct slot *p_slot;
@@ -1021,11 +790,10 @@
ctrl->event_queue[loop].event_type);
hp_slot = ctrl->event_queue[loop].hp_slot;
- func = shpchp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
-
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
- dbg("%s: hp_slot %d, func %p, p_slot %p\n", __FUNCTION__, hp_slot, func, p_slot);
+ dbg("%s: hp_slot %d, p_slot %p\n",
+ __FUNCTION__, hp_slot, p_slot);
if (ctrl->event_queue[loop].event_type == INT_BUTTON_CANCEL) {
dbg("%s: button cancel\n", __FUNCTION__);
@@ -1147,13 +915,6 @@
{
u8 getstatus = 0;
int rc;
- struct pci_func *func;
-
- func = shpchp_slot_find(p_slot->bus, p_slot->device, 0);
- if (!func) {
- dbg("%s: Error! slot NULL\n", __FUNCTION__);
- return -ENODEV;
- }
/* Check to see if (latch closed, card present, power off) */
down(&p_slot->ctrl->crit_sect);
@@ -1177,75 +938,35 @@
}
up(&p_slot->ctrl->crit_sect);
- slot_remove(func);
-
- func = shpchp_slot_create(p_slot->bus);
- if (func == NULL)
- return -ENOMEM;
-
- func->bus = p_slot->bus;
- func->device = p_slot->device;
- func->function = 0;
- func->configured = 0;
- func->is_a_board = 1;
+ p_slot->is_a_board = 1;
/* We have to save the presence info for these slots */
- p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
- p_slot->hpc_ops->get_power_status(p_slot, &(func->pwr_save));
- dbg("%s: func->pwr_save %x\n", __FUNCTION__, func->pwr_save);
+ p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
+ p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
+ dbg("%s: p_slot->pwr_save %x\n", __FUNCTION__, p_slot->pwr_save);
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
- func->switch_save = !getstatus? 0x10:0;
- rc = board_added(func, p_slot->ctrl);
+ rc = board_added(p_slot);
if (rc) {
- if (is_bridge(func, p_slot->ctrl)) {
- u8 secondary = func->pci_dev->subordinate->secondary;
- u8 subordinate =
- func->pci_dev->subordinate->subordinate;
- bridge_slot_remove(func, secondary, subordinate);
- } else
- slot_remove(func);
-
- /* Setup slot structure with entry for empty slot */
- func = shpchp_slot_create(p_slot->bus);
- if (func == NULL)
- return -ENOMEM; /* Out of memory */
-
- func->bus = p_slot->bus;
- func->device = p_slot->device;
- func->function = 0;
- func->configured = 0;
- func->is_a_board = 1;
-
- /* We have to save the presence info for these slots */
- p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
+ p_slot->hpc_ops->get_adapter_status(p_slot,
+ &(p_slot->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
- func->switch_save = !getstatus? 0x10:0;
}
- if (p_slot)
- update_slot_info(p_slot);
-
+ update_slot_info(p_slot);
return rc;
}
int shpchp_disable_slot (struct slot *p_slot)
{
- u8 class_code, header_type, BCR;
- u8 index = 0;
u8 getstatus = 0;
u32 rc = 0;
int ret = 0;
- unsigned int devfn;
- struct pci_bus *pci_bus;
- struct pci_func *func;
if (!p_slot->ctrl)
return -ENODEV;
- pci_bus = p_slot->ctrl->pci_dev->subordinate;
-
/* Check to see if (latch closed, card present, power on) */
down(&p_slot->ctrl->crit_sect);
@@ -1269,54 +990,8 @@
}
up(&p_slot->ctrl->crit_sect);
- func = shpchp_slot_find(p_slot->bus, p_slot->device, index++);
-
- /* Make sure there are no video controllers here
- * for all func of p_slot
- */
- while (func && !rc) {
- pci_bus->number = func->bus;
- devfn = PCI_DEVFN(func->device, func->function);
-
- /* Check the Class Code */
- rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);
- if (rc)
- return -ENODEV;
-
- if (class_code == PCI_BASE_CLASS_DISPLAY) {
- /* Display/Video adapter (not supported) */
- rc = REMOVE_NOT_SUPPORTED;
- } else {
- /* See if it's a bridge */
- rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
- if (rc)
- return -ENODEV;
-
- /* If it's a bridge, check the VGA Enable bit */
- if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
- rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
- if (rc)
- return -ENODEV;
-
- /* If the VGA Enable bit is set, remove isn't supported */
- if (BCR & PCI_BRIDGE_CTL_VGA) {
- rc = REMOVE_NOT_SUPPORTED;
- }
- }
- }
-
- func = shpchp_slot_find(p_slot->bus, p_slot->device, index++);
- }
-
- func = shpchp_slot_find(p_slot->bus, p_slot->device, 0);
- if ((func != NULL) && !rc) {
- rc = remove_board(func, p_slot->ctrl);
- } else if (!rc)
- rc = -ENODEV;
-
- if (p_slot)
- update_slot_info(p_slot);
-
+ rc = remove_board(p_slot);
+ update_slot_info(p_slot);
return rc;
}