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Subject[PATCH] pnp - Resource Management Changes (2/13)
This patch contains a new algorithm that can resolve nearly any resource conflict.
It also contains many bug fixes and better error detection for device activation.
It works by moving resources in other devices, when necessary, to make room for
new devices. The current algorithm is not able to resolve conflicts in many cases
and therefore I feel this will be a major improvement.

Please apply,
Adam


diff -urN a/drivers/pnp/manager.c b/drivers/pnp/manager.c
--- a/drivers/pnp/manager.c Thu Jan 1 00:00:00 1970
+++ b/drivers/pnp/manager.c Sun Feb 9 09:48:20 2003
@@ -0,0 +1,700 @@
+/*
+ * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
+ *
+ * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#ifdef CONFIG_PNP_DEBUG
+ #define DEBUG
+#else
+ #undef DEBUG
+#endif
+
+#include <linux/pnp.h>
+#include "base.h"
+
+
+int pnp_max_moves = 4;
+
+
+static int pnp_next_port(struct pnp_dev * dev, int idx)
+{
+ struct pnp_port *port;
+ unsigned long *value1, *value2, *value3;
+ if (!dev || idx < 0 || idx >= PNP_MAX_PORT)
+ return 0;
+ port = dev->rule->port[idx];
+ if (!port)
+ return 1;
+
+ value1 = &dev->res.port_resource[idx].start;
+ value2 = &dev->res.port_resource[idx].end;
+ value3 = &dev->res.port_resource[idx].flags;
+
+ /* set the initial values if this is the first time */
+ if (*value1 == 0) {
+ *value1 = port->min;
+ *value2 = *value1 + port->size -1;
+ *value3 = port->flags | IORESOURCE_IO;
+ if (!pnp_check_port(dev, idx))
+ return 1;
+ }
+
+ /* run through until pnp_check_port is happy */
+ do {
+ *value1 += port->align;
+ *value2 = *value1 + port->size - 1;
+ if (*value1 > port->max || !port->align)
+ return 0;
+ } while (pnp_check_port(dev, idx));
+ return 1;
+}
+
+static int pnp_next_mem(struct pnp_dev * dev, int idx)
+{
+ struct pnp_mem *mem;
+ unsigned long *value1, *value2, *value3;
+ if (!dev || idx < 0 || idx >= PNP_MAX_MEM)
+ return 0;
+ mem = dev->rule->mem[idx];
+ if (!mem)
+ return 1;
+
+ value1 = &dev->res.mem_resource[idx].start;
+ value2 = &dev->res.mem_resource[idx].end;
+ value3 = &dev->res.mem_resource[idx].flags;
+
+ /* set the initial values if this is the first time */
+ if (*value1 == 0) {
+ *value1 = mem->min;
+ *value2 = *value1 + mem->size -1;
+ *value3 = mem->flags | IORESOURCE_MEM;
+ if (!(mem->flags & IORESOURCE_MEM_WRITEABLE))
+ *value3 |= IORESOURCE_READONLY;
+ if (mem->flags & IORESOURCE_MEM_CACHEABLE)
+ *value3 |= IORESOURCE_CACHEABLE;
+ if (mem->flags & IORESOURCE_MEM_RANGELENGTH)
+ *value3 |= IORESOURCE_RANGELENGTH;
+ if (mem->flags & IORESOURCE_MEM_SHADOWABLE)
+ *value3 |= IORESOURCE_SHADOWABLE;
+ if (!pnp_check_mem(dev, idx))
+ return 1;
+ }
+
+ /* run through until pnp_check_mem is happy */
+ do {
+ *value1 += mem->align;
+ *value2 = *value1 + mem->size - 1;
+ if (*value1 > mem->max || !mem->align)
+ return 0;
+ } while (pnp_check_mem(dev, idx));
+ return 1;
+}
+
+static int pnp_next_irq(struct pnp_dev * dev, int idx)
+{
+ struct pnp_irq *irq;
+ unsigned long *value1, *value2, *value3;
+ int i, mask;
+ if (!dev || idx < 0 || idx >= PNP_MAX_IRQ)
+ return 0;
+ irq = dev->rule->irq[idx];
+ if (!irq)
+ return 1;
+
+ value1 = &dev->res.irq_resource[idx].start;
+ value2 = &dev->res.irq_resource[idx].end;
+ value3 = &dev->res.irq_resource[idx].flags;
+
+ /* set the initial values if this is the first time */
+ if (*value1 == -1) {
+ *value1 = *value2 = 0;
+ *value3 = irq->flags | IORESOURCE_IRQ;
+ if (!pnp_check_irq(dev, idx))
+ return 1;
+ }
+
+ mask = irq->map;
+ for (i = *value1 + 1; i < 16; i++)
+ {
+ if(mask>>i & 0x01) {
+ *value1 = *value2 = i;
+ if(!pnp_check_irq(dev, idx))
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int pnp_next_dma(struct pnp_dev * dev, int idx)
+{
+ struct pnp_dma *dma;
+ struct resource backup;
+ unsigned long *value1, *value2, *value3;
+ int i, mask;
+ if (!dev || idx < 0 || idx >= PNP_MAX_DMA)
+ return -EINVAL;
+ dma = dev->rule->dma[idx];
+ if (!dma)
+ return 1;
+
+ value1 = &dev->res.dma_resource[idx].start;
+ value2 = &dev->res.dma_resource[idx].end;
+ value3 = &dev->res.dma_resource[idx].flags;
+ *value3 = dma->flags | IORESOURCE_DMA;
+ backup = dev->res.dma_resource[idx];
+
+ /* set the initial values if this is the first time */
+ if (*value1 == -1) {
+ *value1 = *value2 = 0;
+ *value3 = dma->flags | IORESOURCE_DMA;
+ if (!pnp_check_dma(dev, idx))
+ return 1;
+ }
+
+ mask = dma->map;
+ for (i = *value1 + 1; i < 8; i++)
+ {
+ if(mask>>i & 0x01) {
+ *value1 = *value2 = i;
+ if(!pnp_check_dma(dev, idx))
+ return 1;
+ }
+ }
+ dev->res.dma_resource[idx] = backup;
+ return 0;
+}
+
+
+static int pnp_next_rule(struct pnp_dev *dev)
+{
+ int depnum = dev->rule->depnum;
+ int max = pnp_get_max_depnum(dev);
+ int priority = PNP_RES_PRIORITY_PREFERRED;
+
+ if(depnum > 0) {
+ struct pnp_resources * res = pnp_find_resources(dev, depnum);
+ priority = res->priority;
+ }
+
+ for (; priority <= PNP_RES_PRIORITY_FUNCTIONAL; priority++, depnum=0) {
+ depnum += 1;
+ for (; depnum <= max; depnum++) {
+ struct pnp_resources * res = pnp_find_resources(dev, depnum);
+ if (res->priority == priority) {
+ if(pnp_generate_rule(dev, depnum, dev->rule)) {
+ dev->rule->depnum = depnum;
+ return 1;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+struct pnp_change {
+ struct list_head change_list;
+ struct list_head changes;
+ struct pnp_resource_table res_bak;
+ struct pnp_rule_table rule_bak;
+ struct pnp_dev * dev;
+};
+
+static void pnp_free_changes(struct pnp_change * parent)
+{
+ struct list_head * pos, * temp;
+ list_for_each_safe(pos, temp, &parent->changes) {
+ struct pnp_change * change = list_entry(pos, struct pnp_change, change_list);
+ list_del(&change->change_list);
+ kfree(change);
+ }
+}
+
+static void pnp_undo_changes(struct pnp_change * parent)
+{
+ struct list_head * pos, * temp;
+ list_for_each_safe(pos, temp, &parent->changes) {
+ struct pnp_change * change = list_entry(pos, struct pnp_change, change_list);
+ *change->dev->rule = change->rule_bak;
+ change->dev->res = change->res_bak;
+ list_del(&change->change_list);
+ kfree(change);
+ }
+}
+
+static struct pnp_change * pnp_add_change(struct pnp_change * parent, struct pnp_dev * dev)
+{
+ struct pnp_change * change = pnp_alloc(sizeof(struct pnp_change));
+ if (!change)
+ return NULL;
+ change->res_bak = dev->res;
+ change->rule_bak = *dev->rule;
+ change->dev = dev;
+ INIT_LIST_HEAD(&change->changes);
+ if (parent)
+ list_add(&change->change_list, &parent->changes);
+ return change;
+}
+
+static void pnp_commit_changes(struct pnp_change * parent, struct pnp_change * change)
+{
+ /* check if it's the root change */
+ if (!parent)
+ return;
+ if (!list_empty(&change->changes))
+ list_splice_init(&change->changes, &parent->changes);
+}
+static int pnp_next_config(struct pnp_dev * dev, int move, struct pnp_change * parent);
+
+static int pnp_next_request(struct pnp_dev * dev, int move, struct pnp_change * parent, struct pnp_change * change)
+{
+ int i;
+ struct pnp_dev * cdev;
+
+ for (i = 0; i < PNP_MAX_PORT; i++) {
+ if (dev->res.port_resource[i].start == 0 || pnp_check_port_conflicts(dev,i,SEARCH_WARM)) {
+ if (!pnp_next_port(dev,i))
+ return 0;
+ }
+ do {
+ cdev = pnp_check_port_conflicts(dev,i,SEARCH_COLD);
+ if (cdev && (!move || !pnp_next_config(cdev,move,change))) {
+ pnp_undo_changes(change);
+ if (!pnp_next_port(dev,i))
+ return 0;
+ }
+ } while (cdev);
+ pnp_commit_changes(parent, change);
+ }
+ for (i = 0; i < PNP_MAX_MEM; i++) {
+ if (dev->res.mem_resource[i].start == 0 || pnp_check_mem_conflicts(dev,i,SEARCH_WARM)) {
+ if (!pnp_next_mem(dev,i))
+ return 0;
+ }
+ do {
+ cdev = pnp_check_mem_conflicts(dev,i,SEARCH_COLD);
+ if (cdev && (!move || !pnp_next_config(cdev,move,change))) {
+ pnp_undo_changes(change);
+ if (!pnp_next_mem(dev,i))
+ return 0;
+ }
+ } while (cdev);
+ pnp_commit_changes(parent, change);
+ }
+ for (i = 0; i < PNP_MAX_IRQ; i++) {
+ if (dev->res.irq_resource[i].start == -1 || pnp_check_irq_conflicts(dev,i,SEARCH_WARM)) {
+ if (!pnp_next_irq(dev,i))
+ return 0;
+ }
+ do {
+ cdev = pnp_check_irq_conflicts(dev,i,SEARCH_COLD);
+ if (cdev && (!move || !pnp_next_config(cdev,move,change))) {
+ pnp_undo_changes(change);
+ if (!pnp_next_irq(dev,i))
+ return 0;
+ }
+ } while (cdev);
+ pnp_commit_changes(parent, change);
+ }
+ for (i = 0; i < PNP_MAX_DMA; i++) {
+ if (dev->res.dma_resource[i].start == -1 || pnp_check_dma_conflicts(dev,i,SEARCH_WARM)) {
+ if (!pnp_next_dma(dev,i))
+ return 0;
+ }
+ do {
+ cdev = pnp_check_dma_conflicts(dev,i,SEARCH_COLD);
+ if (cdev && (!move || !pnp_next_config(cdev,move,change))) {
+ pnp_undo_changes(change);
+ if (!pnp_next_dma(dev,i))
+ return 0;
+ }
+ } while (cdev);
+ pnp_commit_changes(parent, change);
+ }
+ return 1;
+}
+
+static int pnp_next_config(struct pnp_dev * dev, int move, struct pnp_change * parent)
+{
+ struct pnp_change * change = pnp_add_change(parent,dev);
+ move--;
+ if (!change)
+ return 0;
+ if (!dev->rule)
+ goto fail;
+ if (!pnp_can_configure(dev))
+ goto fail;
+ if (!dev->rule->depnum) {
+ if (!pnp_next_rule(dev))
+ goto fail;
+ }
+ while (!pnp_next_request(dev, move, parent, change)) {
+ if(!pnp_next_rule(dev))
+ goto fail;
+ pnp_init_resource_table(&dev->res);
+ }
+ if (!parent) {
+ pnp_free_changes(change);
+ kfree(change);
+ }
+ return 1;
+
+fail:
+ if (!parent)
+ kfree(change);
+ return 0;
+}
+
+/* this advanced algorithm will shuffle other configs to make room and ensure that the most possible devices have configs */
+static int pnp_advanced_config(struct pnp_dev * dev)
+{
+ int move;
+ /* if the device cannot be configured skip it */
+ if (!pnp_can_configure(dev))
+ return 1;
+ if (!dev->rule) {
+ dev->rule = pnp_alloc(sizeof(struct pnp_rule_table));
+ if (!dev->rule)
+ return -ENOMEM;
+ }
+
+ spin_lock(&pnp_lock);
+ for (move = 1; move <= pnp_max_moves; move++) {
+ dev->rule->depnum = 0;
+ pnp_init_resource_table(&dev->res);
+ if (pnp_next_config(dev,move,NULL)) {
+ spin_unlock(&pnp_lock);
+ return 1;
+ }
+ }
+
+ pnp_init_resource_table(&dev->res);
+ dev->rule->depnum = 0;
+ spin_unlock(&pnp_lock);
+ pnp_err("res: Unable to resolve resource conflicts for the device '%s', some devices may not be usable.", dev->dev.bus_id);
+ return 0;
+}
+
+int pnp_resolve_conflicts(struct pnp_dev *dev)
+{
+ int i;
+ struct pnp_dev * cdev;
+
+ for (i = 0; i < PNP_MAX_PORT; i++)
+ {
+ do {
+ cdev = pnp_check_port_conflicts(dev,i,SEARCH_COLD);
+ if (cdev)
+ pnp_advanced_config(cdev);
+ } while (cdev);
+ }
+ for (i = 0; i < PNP_MAX_MEM; i++)
+ {
+ do {
+ cdev = pnp_check_mem_conflicts(dev,i,SEARCH_COLD);
+ if (cdev)
+ pnp_advanced_config(cdev);
+ } while (cdev);
+ }
+ for (i = 0; i < PNP_MAX_IRQ; i++)
+ {
+ do {
+ cdev = pnp_check_irq_conflicts(dev,i,SEARCH_COLD);
+ if (cdev)
+ pnp_advanced_config(cdev);
+ } while (cdev);
+ }
+ for (i = 0; i < PNP_MAX_DMA; i++)
+ {
+ do {
+ cdev = pnp_check_dma_conflicts(dev,i,SEARCH_COLD);
+ if (cdev)
+ pnp_advanced_config(cdev);
+ } while (cdev);
+ }
+ return 1;
+}
+
+/* this is a much faster algorithm but it may not leave resources for other devices to use */
+static int pnp_simple_config(struct pnp_dev * dev)
+{
+ int i;
+ spin_lock(&pnp_lock);
+ if (dev->active) {
+ spin_unlock(&pnp_lock);
+ return 1;
+ }
+ dev->rule->depnum = 0;
+ pnp_init_resource_table(&dev->res);
+ if (!dev->rule) {
+ dev->rule = pnp_alloc(sizeof(struct pnp_rule_table));
+ if (!dev->rule) {
+ spin_unlock(&pnp_lock);
+ return -ENOMEM;
+ }
+ }
+ while (pnp_next_rule(dev)) {
+ for (i = 0; i < PNP_MAX_PORT; i++) {
+ if (!pnp_next_port(dev,i))
+ continue;
+ }
+ for (i = 0; i < PNP_MAX_MEM; i++) {
+ if (!pnp_next_mem(dev,i))
+ continue;
+ }
+ for (i = 0; i < PNP_MAX_IRQ; i++) {
+ if (!pnp_next_irq(dev,i))
+ continue;
+ }
+ for (i = 0; i < PNP_MAX_DMA; i++) {
+ if (!pnp_next_dma(dev,i))
+ continue;
+ }
+ goto done;
+ }
+ pnp_init_resource_table(&dev->res);
+ dev->rule->depnum = 0;
+ spin_unlock(&pnp_lock);
+ return 0;
+
+done:
+ pnp_resolve_conflicts(dev); /* this is required or we will break the advanced configs */
+ return 1;
+}
+
+static int pnp_compare_resources(struct pnp_resource_table * resa, struct pnp_resource_table * resb)
+{
+ int idx;
+ for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
+ if (resa->irq_resource[idx].start != resb->irq_resource[idx].start)
+ return 1;
+ }
+ for (idx = 0; idx < PNP_MAX_DMA; idx++) {
+ if (resa->dma_resource[idx].start != resb->dma_resource[idx].start)
+ return 1;
+ }
+ for (idx = 0; idx < PNP_MAX_PORT; idx++) {
+ if (resa->port_resource[idx].start != resb->port_resource[idx].start)
+ return 1;
+ if (resa->port_resource[idx].end != resb->port_resource[idx].end)
+ return 1;
+ }
+ for (idx = 0; idx < PNP_MAX_MEM; idx++) {
+ if (resa->mem_resource[idx].start != resb->mem_resource[idx].start)
+ return 1;
+ if (resa->mem_resource[idx].end != resb->mem_resource[idx].end)
+ return 1;
+ }
+ return 0;
+}
+
+
+/*
+ * PnP Device Resource Management
+ */
+
+/**
+ * pnp_auto_config_dev - determines the best possible resource configuration based on available information
+ * @dev: pointer to the desired device
+ *
+ */
+
+int pnp_auto_config_dev(struct pnp_dev *dev)
+{
+ int error;
+ if(!dev)
+ return -EINVAL;
+
+ dev->config_mode = PNP_CONFIG_AUTO;
+
+ if(dev->active)
+ error = pnp_resolve_conflicts(dev);
+ else
+ error = pnp_advanced_config(dev);
+ return error;
+}
+
+/**
+ * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
+ * @dev: pointer to the desired device
+ * @res: pointer to the new resource config
+ *
+ * This function can be used by drivers that want to manually set thier resources.
+ */
+
+int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table * res, int mode)
+{
+ int i;
+ struct pnp_resource_table bak = dev->res;
+ if (!dev || !res)
+ return -EINVAL;
+ if (dev->active)
+ return -EBUSY;
+ spin_lock(&pnp_lock);
+ dev->res = *res;
+
+ if (!(mode & PNP_CONFIG_FORCE)) {
+ for (i = 0; i < PNP_MAX_PORT; i++) {
+ if(pnp_check_port(dev,i))
+ goto fail;
+ }
+ for (i = 0; i < PNP_MAX_MEM; i++) {
+ if(pnp_check_mem(dev,i))
+ goto fail;
+ }
+ for (i = 0; i < PNP_MAX_IRQ; i++) {
+ if(pnp_check_irq(dev,i))
+ goto fail;
+ }
+ for (i = 0; i < PNP_MAX_DMA; i++) {
+ if(pnp_check_dma(dev,i))
+ goto fail;
+ }
+ }
+ spin_unlock(&pnp_lock);
+
+ pnp_resolve_conflicts(dev);
+ dev->config_mode = PNP_CONFIG_MANUAL;
+ return 0;
+
+fail:
+ dev->res = bak;
+ spin_unlock(&pnp_lock);
+ return -EINVAL;
+}
+
+/**
+ * pnp_activate_dev - activates a PnP device for use
+ * @dev: pointer to the desired device
+ *
+ * finds the best resource configuration and then informs the correct pnp protocol
+ */
+
+int pnp_activate_dev(struct pnp_dev *dev)
+{
+ if (!dev)
+ return -EINVAL;
+ if (dev->active) {
+ pnp_info("res: The PnP device '%s' is already active.", dev->dev.bus_id);
+ return -EBUSY;
+ }
+ spin_lock(&pnp_lock); /* we lock just in case the device is being configured during this call */
+ dev->active = 1;
+ spin_unlock(&pnp_lock); /* once the device is claimed active we know it won't be configured so we can unlock */
+
+ /* If this condition is true, advanced configuration failed, we need to get this device up and running
+ * so we use the simple config engine which ignores cold conflicts, this of course may lead to new failures */
+ if (!pnp_is_active(dev)) {
+ if (!pnp_simple_config(dev)) {
+ pnp_err("res: Unable to resolve resource conflicts for the device '%s'.", dev->dev.bus_id);
+ goto fail;
+ }
+ }
+ if (dev->config_mode & PNP_CONFIG_INVALID) {
+ pnp_info("res: Unable to activate the PnP device '%s' because its resource configuration is invalid.", dev->dev.bus_id);
+ goto fail;
+ }
+ if (dev->status != PNP_READY && dev->status != PNP_ATTACHED){
+ pnp_err("res: Activation failed because the PnP device '%s' is busy.", dev->dev.bus_id);
+ goto fail;
+ }
+ if (!pnp_can_write(dev)) {
+ pnp_info("res: Unable to activate the PnP device '%s' because this feature is not supported.", dev->dev.bus_id);
+ goto fail;
+ }
+ if (dev->protocol->set(dev, &dev->res)<0) {
+ pnp_err("res: The protocol '%s' reports that activating the PnP device '%s' has failed.", dev->protocol->name, dev->dev.bus_id);
+ goto fail;
+ }
+ if (pnp_can_read(dev)) {
+ struct pnp_resource_table res;
+ dev->protocol->get(dev, &res);
+ if (pnp_compare_resources(&dev->res, &res)) /* if this happens we may be in big trouble but it's best just to continue */
+ pnp_err("res: The resources requested do not match those set for the PnP device '%s'.", dev->dev.bus_id);
+ } else
+ dev->active = pnp_is_active(dev);
+ pnp_dbg("res: the device '%s' has been activated.", dev->dev.bus_id);
+ if (dev->rule) {
+ kfree(dev->rule);
+ dev->rule = NULL;
+ }
+ return 0;
+
+fail:
+ dev->active = 0; /* fixes incorrect active state */
+ return -EINVAL;
+}
+
+/**
+ * pnp_disable_dev - disables device
+ * @dev: pointer to the desired device
+ *
+ * inform the correct pnp protocol so that resources can be used by other devices
+ */
+
+int pnp_disable_dev(struct pnp_dev *dev)
+{
+ if (!dev)
+ return -EINVAL;
+ if (!dev->active) {
+ pnp_info("res: The PnP device '%s' is already disabled.", dev->dev.bus_id);
+ return -EINVAL;
+ }
+ if (dev->status != PNP_READY){
+ pnp_info("res: Disable failed becuase the PnP device '%s' is busy.", dev->dev.bus_id);
+ return -EINVAL;
+ }
+ if (!pnp_can_disable(dev)) {
+ pnp_info("res: Unable to disable the PnP device '%s' because this feature is not supported.", dev->dev.bus_id);
+ return -EINVAL;
+ }
+ if (dev->protocol->disable(dev)<0) {
+ pnp_err("res: The protocol '%s' reports that disabling the PnP device '%s' has failed.", dev->protocol->name, dev->dev.bus_id);
+ return -1;
+ }
+ dev->active = 0; /* just in case the protocol doesn't do this */
+ pnp_dbg("the device '%s' has been disabled.", dev->dev.bus_id);
+ return 0;
+}
+
+/**
+ * pnp_resource_change - change one resource
+ * @resource: pointer to resource to be changed
+ * @start: start of region
+ * @size: size of region
+ *
+ */
+
+void pnp_resource_change(struct resource *resource, unsigned long start, unsigned long size)
+{
+ if (resource == NULL)
+ return;
+ resource->flags &= ~IORESOURCE_AUTO;
+ resource->start = start;
+ resource->end = start + size - 1;
+}
+
+
+EXPORT_SYMBOL(pnp_auto_config_dev);
+EXPORT_SYMBOL(pnp_manual_config_dev);
+EXPORT_SYMBOL(pnp_activate_dev);
+EXPORT_SYMBOL(pnp_disable_dev);
+EXPORT_SYMBOL(pnp_resource_change);
+
+
+/* format is: pnp_max_moves=num */
+
+static int __init pnp_setup_max_moves(char *str)
+{
+ get_option(&str,&pnp_max_moves);
+ return 1;
+}
+
+__setup("pnp_max_moves=", pnp_setup_max_moves);
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