--- /dev/null
+/*
+ * resource.c - Contains functions for registering and analyzing resource information
+ *
+ * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
+ * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
+ * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+
+#include <linux/pnp.h>
+#include "base.h"
+
+static int pnp_reserve_irq[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some IRQ */
+static int pnp_reserve_dma[8] = {[0 ... 7] = -1 }; /* reserve (don't use) some DMA */
+static int pnp_reserve_io[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some I/O region */
+static int pnp_reserve_mem[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some memory region */
+
+/*
+ * option registration
+ */
+
+static struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
+ unsigned int option_flags)
+{
+ struct pnp_option *option;
+
+ option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
+ if (!option)
+ return NULL;
+
+ option->flags = option_flags;
+ option->type = type;
+
+ list_add_tail(&option->list, &dev->options);
+ return option;
+}
+
+int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
+ pnp_irq_mask_t *map, unsigned char flags)
+{
+ struct pnp_option *option;
+ struct pnp_irq *irq;
+
+ option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
+ if (!option)
+ return -ENOMEM;
+
+ irq = &option->u.irq;
+ irq->map = *map;
+ irq->flags = flags;
+
+#ifdef CONFIG_PCI
+ {
+ int i;
+
+ for (i = 0; i < 16; i++)
+ if (test_bit(i, irq->map.bits))
+ pcibios_penalize_isa_irq(i, 0);
+ }
+#endif
+
+ dbg_pnp_show_option(dev, option);
+ return 0;
+}
+
+int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
+ unsigned char map, unsigned char flags)
+{
+ struct pnp_option *option;
+ struct pnp_dma *dma;
+
+ option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
+ if (!option)
+ return -ENOMEM;
+
+ dma = &option->u.dma;
+ dma->map = map;
+ dma->flags = flags;
+
+ dbg_pnp_show_option(dev, option);
+ return 0;
+}
+
+int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
+ resource_size_t min, resource_size_t max,
+ resource_size_t align, resource_size_t size,
+ unsigned char flags)
+{
+ struct pnp_option *option;
+ struct pnp_port *port;
+
+ option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
+ if (!option)
+ return -ENOMEM;
+
+ port = &option->u.port;
+ port->min = min;
+ port->max = max;
+ port->align = align;
+ port->size = size;
+ port->flags = flags;
+
+ dbg_pnp_show_option(dev, option);
+ return 0;
+}
+
+int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
+ resource_size_t min, resource_size_t max,
+ resource_size_t align, resource_size_t size,
+ unsigned char flags)
+{
+ struct pnp_option *option;
+ struct pnp_mem *mem;
+
+ option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
+ if (!option)
+ return -ENOMEM;
+
+ mem = &option->u.mem;
+ mem->min = min;
+ mem->max = max;
+ mem->align = align;
+ mem->size = size;
+ mem->flags = flags;
+
+ dbg_pnp_show_option(dev, option);
+ return 0;
+}
+
+void pnp_free_options(struct pnp_dev *dev)
+{
+ struct pnp_option *option, *tmp;
+
+ list_for_each_entry_safe(option, tmp, &dev->options, list) {
+ list_del(&option->list);
+ kfree(option);
+ }
+}
+
+/*
+ * resource validity checking
+ */
+
+#define length(start, end) (*(end) - *(start) + 1)
+
+/* Two ranges conflict if one doesn't end before the other starts */
+#define ranged_conflict(starta, enda, startb, endb) \
+ !((*(enda) < *(startb)) || (*(endb) < *(starta)))
+
+#define cannot_compare(flags) \
+((flags) & IORESOURCE_DISABLED)
+
+int pnp_check_port(struct pnp_dev *dev, struct resource *res)
+{
+ int i;
+ struct pnp_dev *tdev;
+ struct resource *tres;
+ resource_size_t *port, *end, *tport, *tend;
+
+ port = &res->start;
+ end = &res->end;
+
+ /* if the resource doesn't exist, don't complain about it */
+ if (cannot_compare(res->flags))
+ return 1;
+
+ /* check if the resource is already in use, skip if the
+ * device is active because it itself may be in use */
+ if (!dev->active) {
+ if (!request_region(*port, length(port, end), "pnp"))
+ return 0;
+ release_region(*port, length(port, end));
+ }
+
+ /* check if the resource is reserved */
+ for (i = 0; i < 8; i++) {
+ int rport = pnp_reserve_io[i << 1];
+ int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
+ if (ranged_conflict(port, end, &rport, &rend))
+ return 0;
+ }
+
+ /* check for internal conflicts */
+ for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
+ if (tres != res && tres->flags & IORESOURCE_IO) {
+ tport = &tres->start;
+ tend = &tres->end;
+ if (ranged_conflict(port, end, tport, tend))
+ return 0;
+ }
+ }
+
+ /* check for conflicts with other pnp devices */
+ pnp_for_each_dev(tdev) {
+ if (tdev == dev)
+ continue;
+ for (i = 0;
+ (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
+ i++) {
+ if (tres->flags & IORESOURCE_IO) {
+ if (cannot_compare(tres->flags))
+ continue;
+ if (tres->flags & IORESOURCE_WINDOW)
+ continue;
+ tport = &tres->start;
+ tend = &tres->end;
+ if (ranged_conflict(port, end, tport, tend))
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
+int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
+{
+ int i;
+ struct pnp_dev *tdev;
+ struct resource *tres;
+ resource_size_t *addr, *end, *taddr, *tend;
+
+ addr = &res->start;
+ end = &res->end;
+
+ /* if the resource doesn't exist, don't complain about it */
+ if (cannot_compare(res->flags))
+ return 1;
+
+ /* check if the resource is already in use, skip if the
+ * device is active because it itself may be in use */
+ if (!dev->active) {
+ if (!request_mem_region(*addr, length(addr, end), "pnp"))
+ return 0;
+ release_mem_region(*addr, length(addr, end));
+ }
+
+ /* check if the resource is reserved */
+ for (i = 0; i < 8; i++) {
+ int raddr = pnp_reserve_mem[i << 1];
+ int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
+ if (ranged_conflict(addr, end, &raddr, &rend))
+ return 0;
+ }
+
+ /* check for internal conflicts */
+ for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
+ if (tres != res && tres->flags & IORESOURCE_MEM) {
+ taddr = &tres->start;
+ tend = &tres->end;
+ if (ranged_conflict(addr, end, taddr, tend))
+ return 0;
+ }
+ }
+
+ /* check for conflicts with other pnp devices */
+ pnp_for_each_dev(tdev) {
+ if (tdev == dev)
+ continue;
+ for (i = 0;
+ (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
+ i++) {
+ if (tres->flags & IORESOURCE_MEM) {
+ if (cannot_compare(tres->flags))
+ continue;
+ if (tres->flags & IORESOURCE_WINDOW)
+ continue;
+ taddr = &tres->start;
+ tend = &tres->end;
+ if (ranged_conflict(addr, end, taddr, tend))
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
+static irqreturn_t pnp_test_handler(int irq, void *dev_id)
+{
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PCI
+static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
+ unsigned int irq)
+{
+ u32 class;
+ u8 progif;
+
+ if (pci->irq == irq) {
+ pnp_dbg(&pnp->dev, " device %s using irq %d\n",
+ pci_name(pci), irq);
+ return 1;
+ }
+
+ /*
+ * See pci_setup_device() and ata_pci_sff_activate_host() for
+ * similar IDE legacy detection.
+ */
+ pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
+ class >>= 8; /* discard revision ID */
+ progif = class & 0xff;
+ class >>= 8;
+
+ if (class == PCI_CLASS_STORAGE_IDE) {
+ /*
+ * Unless both channels are native-PCI mode only,
+ * treat the compatibility IRQs as busy.
+ */
+ if ((progif & 0x5) != 0x5)
+ if (pci_get_legacy_ide_irq(pci, 0) == irq ||
+ pci_get_legacy_ide_irq(pci, 1) == irq) {
+ pnp_dbg(&pnp->dev, " legacy IDE device %s "
+ "using irq %d\n", pci_name(pci), irq);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+#endif
+
+static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
+{
+#ifdef CONFIG_PCI
+ struct pci_dev *pci = NULL;
+
+ for_each_pci_dev(pci) {
+ if (pci_dev_uses_irq(pnp, pci, irq)) {
+ pci_dev_put(pci);
+ return 1;
+ }
+ }
+#endif
+ return 0;
+}
+
+int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
+{
+ int i;
+ struct pnp_dev *tdev;
+ struct resource *tres;
+ resource_size_t *irq;
+
+ irq = &res->start;
+
+ /* if the resource doesn't exist, don't complain about it */
+ if (cannot_compare(res->flags))
+ return 1;
+
+ /* check if the resource is valid */
+ if (*irq > 15)
+ return 0;
+
+ /* check if the resource is reserved */
+ for (i = 0; i < 16; i++) {
+ if (pnp_reserve_irq[i] == *irq)
+ return 0;
+ }
+
+ /* check for internal conflicts */
+ for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
+ if (tres != res && tres->flags & IORESOURCE_IRQ) {
+ if (tres->start == *irq)
+ return 0;
+ }
+ }
+
+ /* check if the resource is being used by a pci device */
+ if (pci_uses_irq(dev, *irq))
+ return 0;
+
+ /* check if the resource is already in use, skip if the
+ * device is active because it itself may be in use */
+ if (!dev->active) {
+ if (request_irq(*irq, pnp_test_handler,
+ IRQF_PROBE_SHARED, "pnp", NULL))
+ return 0;
+ free_irq(*irq, NULL);
+ }
+
+ /* check for conflicts with other pnp devices */
+ pnp_for_each_dev(tdev) {
+ if (tdev == dev)
+ continue;
+ for (i = 0;
+ (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
+ i++) {
+ if (tres->flags & IORESOURCE_IRQ) {
+ if (cannot_compare(tres->flags))
+ continue;
+ if (tres->start == *irq)
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
+#ifdef CONFIG_ISA_DMA_API
+int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
+{
+ int i;
+ struct pnp_dev *tdev;
+ struct resource *tres;
+ resource_size_t *dma;
+
+ dma = &res->start;
+
+ /* if the resource doesn't exist, don't complain about it */
+ if (cannot_compare(res->flags))
+ return 1;
+
+ /* check if the resource is valid */
+ if (*dma == 4 || *dma > 7)
+ return 0;
+
+ /* check if the resource is reserved */
+ for (i = 0; i < 8; i++) {
+ if (pnp_reserve_dma[i] == *dma)
+ return 0;
+ }
+
+ /* check for internal conflicts */
+ for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
+ if (tres != res && tres->flags & IORESOURCE_DMA) {
+ if (tres->start == *dma)
+ return 0;
+ }
+ }
+
+ /* check if the resource is already in use, skip if the
+ * device is active because it itself may be in use */
+ if (!dev->active) {
+ if (request_dma(*dma, "pnp"))
+ return 0;
+ free_dma(*dma);
+ }
+
+ /* check for conflicts with other pnp devices */
+ pnp_for_each_dev(tdev) {
+ if (tdev == dev)
+ continue;
+ for (i = 0;
+ (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
+ i++) {
+ if (tres->flags & IORESOURCE_DMA) {
+ if (cannot_compare(tres->flags))
+ continue;
+ if (tres->start == *dma)
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+#endif /* CONFIG_ISA_DMA_API */
+
+unsigned long pnp_resource_type(struct resource *res)
+{
+ return res->flags & (IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_IRQ | IORESOURCE_DMA |
+ IORESOURCE_BUS);
+}
+
+struct resource *pnp_get_resource(struct pnp_dev *dev,
+ unsigned long type, unsigned int num)
+{
+ struct pnp_resource *pnp_res;
+ struct resource *res;
+
+ list_for_each_entry(pnp_res, &dev->resources, list) {
+ res = &pnp_res->res;
+ if (pnp_resource_type(res) == type && num-- == 0)
+ return res;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(pnp_get_resource);
+
+static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
+{
+ struct pnp_resource *pnp_res;
+
+ pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
+ if (!pnp_res)
+ return NULL;
+
+ list_add_tail(&pnp_res->list, &dev->resources);
+ return pnp_res;
+}
+
+struct pnp_resource *pnp_add_resource(struct pnp_dev *dev,
+ struct resource *res)
+{
+ struct pnp_resource *pnp_res;
+
+ pnp_res = pnp_new_resource(dev);
+ if (!pnp_res) {
+ dev_err(&dev->dev, "can't add resource %pR\n", res);
+ return NULL;
+ }
+
+ pnp_res->res = *res;
+ pnp_res->res.name = dev->name;
+ dev_dbg(&dev->dev, "%pR\n", res);
+ return pnp_res;
+}
+
+struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
+ int flags)
+{
+ struct pnp_resource *pnp_res;
+ struct resource *res;
+
+ pnp_res = pnp_new_resource(dev);
+ if (!pnp_res) {
+ dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
+ return NULL;
+ }
+
+ res = &pnp_res->res;
+ res->flags = IORESOURCE_IRQ | flags;
+ res->start = irq;
+ res->end = irq;
+
+ dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
+ return pnp_res;
+}
+
+struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
+ int flags)
+{
+ struct pnp_resource *pnp_res;
+ struct resource *res;
+
+ pnp_res = pnp_new_resource(dev);
+ if (!pnp_res) {
+ dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
+ return NULL;
+ }
+
+ res = &pnp_res->res;
+ res->flags = IORESOURCE_DMA | flags;
+ res->start = dma;
+ res->end = dma;
+
+ dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
+ return pnp_res;
+}
+
+struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
+ resource_size_t start,
+ resource_size_t end, int flags)
+{
+ struct pnp_resource *pnp_res;
+ struct resource *res;
+
+ pnp_res = pnp_new_resource(dev);
+ if (!pnp_res) {
+ dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
+ (unsigned long long) start,
+ (unsigned long long) end);
+ return NULL;
+ }
+
+ res = &pnp_res->res;
+ res->flags = IORESOURCE_IO | flags;
+ res->start = start;
+ res->end = end;
+
+ dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
+ return pnp_res;
+}
+
+struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
+ resource_size_t start,
+ resource_size_t end, int flags)
+{
+ struct pnp_resource *pnp_res;
+ struct resource *res;
+
+ pnp_res = pnp_new_resource(dev);
+ if (!pnp_res) {
+ dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
+ (unsigned long long) start,
+ (unsigned long long) end);
+ return NULL;
+ }
+
+ res = &pnp_res->res;
+ res->flags = IORESOURCE_MEM | flags;
+ res->start = start;
+ res->end = end;
+
+ dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
+ return pnp_res;
+}
+
+struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
+ resource_size_t start,
+ resource_size_t end)
+{
+ struct pnp_resource *pnp_res;
+ struct resource *res;
+
+ pnp_res = pnp_new_resource(dev);
+ if (!pnp_res) {
+ dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",
+ (unsigned long long) start,
+ (unsigned long long) end);
+ return NULL;
+ }
+
+ res = &pnp_res->res;
+ res->flags = IORESOURCE_BUS;
+ res->start = start;
+ res->end = end;
+
+ dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
+ return pnp_res;
+}
+
+/*
+ * Determine whether the specified resource is a possible configuration
+ * for this device.
+ */
+int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
+ resource_size_t size)
+{
+ struct pnp_option *option;
+ struct pnp_port *port;
+ struct pnp_mem *mem;
+ struct pnp_irq *irq;
+ struct pnp_dma *dma;
+
+ list_for_each_entry(option, &dev->options, list) {
+ if (option->type != type)
+ continue;
+
+ switch (option->type) {
+ case IORESOURCE_IO:
+ port = &option->u.port;
+ if (port->min == start && port->size == size)
+ return 1;
+ break;
+ case IORESOURCE_MEM:
+ mem = &option->u.mem;
+ if (mem->min == start && mem->size == size)
+ return 1;
+ break;
+ case IORESOURCE_IRQ:
+ irq = &option->u.irq;
+ if (start < PNP_IRQ_NR &&
+ test_bit(start, irq->map.bits))
+ return 1;
+ break;
+ case IORESOURCE_DMA:
+ dma = &option->u.dma;
+ if (dma->map & (1 << start))
+ return 1;
+ break;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(pnp_possible_config);
+
+int pnp_range_reserved(resource_size_t start, resource_size_t end)
+{
+ struct pnp_dev *dev;
+ struct pnp_resource *pnp_res;
+ resource_size_t *dev_start, *dev_end;
+
+ pnp_for_each_dev(dev) {
+ list_for_each_entry(pnp_res, &dev->resources, list) {
+ dev_start = &pnp_res->res.start;
+ dev_end = &pnp_res->res.end;
+ if (ranged_conflict(&start, &end, dev_start, dev_end))
+ return 1;
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(pnp_range_reserved);
+
+/* format is: pnp_reserve_irq=irq1[,irq2] .... */
+static int __init pnp_setup_reserve_irq(char *str)
+{
+ int i;
+
+ for (i = 0; i < 16; i++)
+ if (get_option(&str, &pnp_reserve_irq[i]) != 2)
+ break;
+ return 1;
+}
+
+__setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
+
+/* format is: pnp_reserve_dma=dma1[,dma2] .... */
+static int __init pnp_setup_reserve_dma(char *str)
+{
+ int i;
+
+ for (i = 0; i < 8; i++)
+ if (get_option(&str, &pnp_reserve_dma[i]) != 2)
+ break;
+ return 1;
+}
+
+__setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
+
+/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
+static int __init pnp_setup_reserve_io(char *str)
+{
+ int i;
+
+ for (i = 0; i < 16; i++)
+ if (get_option(&str, &pnp_reserve_io[i]) != 2)
+ break;
+ return 1;
+}
+
+__setup("pnp_reserve_io=", pnp_setup_reserve_io);
+
+/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
+static int __init pnp_setup_reserve_mem(char *str)
+{
+ int i;
+
+ for (i = 0; i < 16; i++)
+ if (get_option(&str, &pnp_reserve_mem[i]) != 2)
+ break;
+ return 1;
+}
+
+__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);
Code Review / kvmfornfv.git / blobdiff