![Bjorn Helgaas](/assets/img/avatar_default.png)
ISAPNP, PNPBIOS, and ACPI describe the "possible resource settings" of a device, i.e., the possibilities an OS bus driver has when it assigns I/O port, MMIO, and other resources to the device. PNP used to maintain this "possible resource setting" information in one independent option structure and a list of dependent option structures for each device. Each of these option structures had lists of I/O, memory, IRQ, and DMA resources, for example: dev independent options ind-io0 -> ind-io1 ... ind-mem0 -> ind-mem1 ... ... dependent option set 0 dep0-io0 -> dep0-io1 ... dep0-mem0 -> dep0-mem1 ... ... dependent option set 1 dep1-io0 -> dep1-io1 ... dep1-mem0 -> dep1-mem1 ... ... ... This data structure was designed for ISAPNP, where the OS configures device resource settings by writing directly to configuration registers. The OS can write the registers in arbitrary order much like it writes PCI BARs. However, for PNPBIOS and ACPI devices, the OS uses firmware interfaces that perform device configuration, and it is important to pass the desired settings to those interfaces in the correct order. The OS learns the correct order by using firmware interfaces that return the "current resource settings" and "possible resource settings," but the option structures above doesn't store the ordering information. This patch replaces the independent and dependent lists with a single list of options. For example, a device might have possible resource settings like this: dev options ind-io0 -> dep0-io0 -> dep1->io0 -> ind-io1 ... All the possible settings are in the same list, in the order they come from the firmware "possible resource settings" list. Each entry is tagged with an independent/dependent flag. Dependent entries also have a "set number" and an optional priority value. All dependent entries must be assigned from the same set. For example, the OS can use all the entries from dependent set 0, or all the entries from dependent set 1, but it cannot mix entries from set 0 with entries from set 1. Prior to this patch PNP didn't keep track of the order of this list, and it assigned all independent options first, then all dependent ones. Using the example above, that resulted in a "desired configuration" list like this: ind->io0 -> ind->io1 -> depN-io0 ... instead of the list the firmware expects, which looks like this: ind->io0 -> depN-io0 -> ind-io1 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Rene Herman <rene.herman@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
464 lines
11 KiB
C
464 lines
11 KiB
C
/*
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* interface.c - contains everything related to the user interface
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*
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* Some code, especially possible resource dumping is based on isapnp_proc.c (c) Jaroslav Kysela <perex@perex.cz>
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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* Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#include <linux/pnp.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/pnp.h>
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#include <linux/stat.h>
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#include <linux/ctype.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include "base.h"
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struct pnp_info_buffer {
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char *buffer; /* pointer to begin of buffer */
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char *curr; /* current position in buffer */
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unsigned long size; /* current size */
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unsigned long len; /* total length of buffer */
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int stop; /* stop flag */
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int error; /* error code */
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};
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typedef struct pnp_info_buffer pnp_info_buffer_t;
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static int pnp_printf(pnp_info_buffer_t * buffer, char *fmt, ...)
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{
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va_list args;
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int res;
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if (buffer->stop || buffer->error)
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return 0;
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va_start(args, fmt);
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res = vsnprintf(buffer->curr, buffer->len - buffer->size, fmt, args);
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va_end(args);
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if (buffer->size + res >= buffer->len) {
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buffer->stop = 1;
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return 0;
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}
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buffer->curr += res;
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buffer->size += res;
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return res;
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}
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static void pnp_print_port(pnp_info_buffer_t * buffer, char *space,
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struct pnp_port *port)
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{
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pnp_printf(buffer, "%sport %#llx-%#llx, align %#llx, size %#llx, "
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"%i-bit address decoding\n", space,
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(unsigned long long) port->min,
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(unsigned long long) port->max,
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port->align ? ((unsigned long long) port->align - 1) : 0,
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(unsigned long long) port->size,
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port->flags & IORESOURCE_IO_16BIT_ADDR ? 16 : 10);
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}
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static void pnp_print_irq(pnp_info_buffer_t * buffer, char *space,
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struct pnp_irq *irq)
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{
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int first = 1, i;
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pnp_printf(buffer, "%sirq ", space);
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for (i = 0; i < PNP_IRQ_NR; i++)
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if (test_bit(i, irq->map.bits)) {
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if (!first) {
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pnp_printf(buffer, ",");
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} else {
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first = 0;
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}
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if (i == 2 || i == 9)
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pnp_printf(buffer, "2/9");
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else
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pnp_printf(buffer, "%i", i);
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}
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if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
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pnp_printf(buffer, "<none>");
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if (irq->flags & IORESOURCE_IRQ_HIGHEDGE)
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pnp_printf(buffer, " High-Edge");
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if (irq->flags & IORESOURCE_IRQ_LOWEDGE)
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pnp_printf(buffer, " Low-Edge");
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if (irq->flags & IORESOURCE_IRQ_HIGHLEVEL)
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pnp_printf(buffer, " High-Level");
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if (irq->flags & IORESOURCE_IRQ_LOWLEVEL)
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pnp_printf(buffer, " Low-Level");
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if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
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pnp_printf(buffer, " (optional)");
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pnp_printf(buffer, "\n");
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}
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static void pnp_print_dma(pnp_info_buffer_t * buffer, char *space,
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struct pnp_dma *dma)
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{
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int first = 1, i;
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char *s;
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pnp_printf(buffer, "%sdma ", space);
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for (i = 0; i < 8; i++)
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if (dma->map & (1 << i)) {
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if (!first) {
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pnp_printf(buffer, ",");
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} else {
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first = 0;
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}
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pnp_printf(buffer, "%i", i);
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}
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if (!dma->map)
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pnp_printf(buffer, "<none>");
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switch (dma->flags & IORESOURCE_DMA_TYPE_MASK) {
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case IORESOURCE_DMA_8BIT:
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s = "8-bit";
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break;
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case IORESOURCE_DMA_8AND16BIT:
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s = "8-bit&16-bit";
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break;
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default:
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s = "16-bit";
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}
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pnp_printf(buffer, " %s", s);
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if (dma->flags & IORESOURCE_DMA_MASTER)
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pnp_printf(buffer, " master");
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if (dma->flags & IORESOURCE_DMA_BYTE)
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pnp_printf(buffer, " byte-count");
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if (dma->flags & IORESOURCE_DMA_WORD)
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pnp_printf(buffer, " word-count");
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switch (dma->flags & IORESOURCE_DMA_SPEED_MASK) {
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case IORESOURCE_DMA_TYPEA:
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s = "type-A";
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break;
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case IORESOURCE_DMA_TYPEB:
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s = "type-B";
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break;
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case IORESOURCE_DMA_TYPEF:
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s = "type-F";
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break;
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default:
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s = "compatible";
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break;
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}
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pnp_printf(buffer, " %s\n", s);
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}
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static void pnp_print_mem(pnp_info_buffer_t * buffer, char *space,
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struct pnp_mem *mem)
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{
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char *s;
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pnp_printf(buffer, "%sMemory %#llx-%#llx, align %#llx, size %#llx",
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space, (unsigned long long) mem->min,
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(unsigned long long) mem->max,
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(unsigned long long) mem->align,
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(unsigned long long) mem->size);
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if (mem->flags & IORESOURCE_MEM_WRITEABLE)
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pnp_printf(buffer, ", writeable");
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if (mem->flags & IORESOURCE_MEM_CACHEABLE)
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pnp_printf(buffer, ", cacheable");
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if (mem->flags & IORESOURCE_MEM_RANGELENGTH)
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pnp_printf(buffer, ", range-length");
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if (mem->flags & IORESOURCE_MEM_SHADOWABLE)
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pnp_printf(buffer, ", shadowable");
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if (mem->flags & IORESOURCE_MEM_EXPANSIONROM)
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pnp_printf(buffer, ", expansion ROM");
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switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
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case IORESOURCE_MEM_8BIT:
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s = "8-bit";
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break;
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case IORESOURCE_MEM_8AND16BIT:
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s = "8-bit&16-bit";
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break;
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case IORESOURCE_MEM_32BIT:
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s = "32-bit";
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break;
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default:
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s = "16-bit";
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}
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pnp_printf(buffer, ", %s\n", s);
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}
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static void pnp_print_option(pnp_info_buffer_t * buffer, char *space,
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struct pnp_option *option)
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{
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switch (option->type) {
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case IORESOURCE_IO:
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pnp_print_port(buffer, space, &option->u.port);
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break;
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case IORESOURCE_MEM:
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pnp_print_mem(buffer, space, &option->u.mem);
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break;
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case IORESOURCE_IRQ:
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pnp_print_irq(buffer, space, &option->u.irq);
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break;
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case IORESOURCE_DMA:
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pnp_print_dma(buffer, space, &option->u.dma);
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break;
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}
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}
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static ssize_t pnp_show_options(struct device *dmdev,
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struct device_attribute *attr, char *buf)
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{
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struct pnp_dev *dev = to_pnp_dev(dmdev);
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pnp_info_buffer_t *buffer;
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struct pnp_option *option;
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int ret, dep = 0, set = 0;
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char *indent;
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buffer = pnp_alloc(sizeof(pnp_info_buffer_t));
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if (!buffer)
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return -ENOMEM;
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buffer->len = PAGE_SIZE;
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buffer->buffer = buf;
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buffer->curr = buffer->buffer;
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list_for_each_entry(option, &dev->options, list) {
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if (pnp_option_is_dependent(option)) {
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indent = " ";
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if (!dep || pnp_option_set(option) != set) {
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set = pnp_option_set(option);
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dep = 1;
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pnp_printf(buffer, "Dependent: %02i - "
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"Priority %s\n", set,
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pnp_option_priority_name(option));
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}
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} else {
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dep = 0;
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indent = "";
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}
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pnp_print_option(buffer, indent, option);
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}
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ret = (buffer->curr - buf);
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kfree(buffer);
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return ret;
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}
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static DEVICE_ATTR(options, S_IRUGO, pnp_show_options, NULL);
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static ssize_t pnp_show_current_resources(struct device *dmdev,
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struct device_attribute *attr,
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char *buf)
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{
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struct pnp_dev *dev = to_pnp_dev(dmdev);
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pnp_info_buffer_t *buffer;
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struct pnp_resource *pnp_res;
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struct resource *res;
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int ret;
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if (!dev)
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return -EINVAL;
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buffer = pnp_alloc(sizeof(pnp_info_buffer_t));
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if (!buffer)
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return -ENOMEM;
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buffer->len = PAGE_SIZE;
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buffer->buffer = buf;
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buffer->curr = buffer->buffer;
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pnp_printf(buffer, "state = %s\n", dev->active ? "active" : "disabled");
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list_for_each_entry(pnp_res, &dev->resources, list) {
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res = &pnp_res->res;
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pnp_printf(buffer, pnp_resource_type_name(res));
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if (res->flags & IORESOURCE_DISABLED) {
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pnp_printf(buffer, " disabled\n");
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continue;
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}
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switch (pnp_resource_type(res)) {
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case IORESOURCE_IO:
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case IORESOURCE_MEM:
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pnp_printf(buffer, " %#llx-%#llx\n",
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(unsigned long long) res->start,
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(unsigned long long) res->end);
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break;
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case IORESOURCE_IRQ:
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case IORESOURCE_DMA:
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pnp_printf(buffer, " %lld\n",
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(unsigned long long) res->start);
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break;
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}
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}
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ret = (buffer->curr - buf);
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kfree(buffer);
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return ret;
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}
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static ssize_t pnp_set_current_resources(struct device *dmdev,
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struct device_attribute *attr,
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const char *ubuf, size_t count)
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{
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struct pnp_dev *dev = to_pnp_dev(dmdev);
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char *buf = (void *)ubuf;
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int retval = 0;
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resource_size_t start, end;
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if (dev->status & PNP_ATTACHED) {
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retval = -EBUSY;
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dev_info(&dev->dev, "in use; can't configure\n");
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goto done;
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}
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while (isspace(*buf))
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++buf;
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if (!strnicmp(buf, "disable", 7)) {
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retval = pnp_disable_dev(dev);
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goto done;
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}
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if (!strnicmp(buf, "activate", 8)) {
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retval = pnp_activate_dev(dev);
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goto done;
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}
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if (!strnicmp(buf, "fill", 4)) {
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if (dev->active)
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goto done;
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retval = pnp_auto_config_dev(dev);
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goto done;
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}
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if (!strnicmp(buf, "auto", 4)) {
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if (dev->active)
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goto done;
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pnp_init_resources(dev);
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retval = pnp_auto_config_dev(dev);
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goto done;
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}
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if (!strnicmp(buf, "clear", 5)) {
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if (dev->active)
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goto done;
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pnp_init_resources(dev);
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goto done;
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}
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if (!strnicmp(buf, "get", 3)) {
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mutex_lock(&pnp_res_mutex);
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if (pnp_can_read(dev))
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dev->protocol->get(dev);
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mutex_unlock(&pnp_res_mutex);
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goto done;
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}
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if (!strnicmp(buf, "set", 3)) {
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if (dev->active)
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goto done;
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buf += 3;
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pnp_init_resources(dev);
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mutex_lock(&pnp_res_mutex);
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while (1) {
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while (isspace(*buf))
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++buf;
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if (!strnicmp(buf, "io", 2)) {
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buf += 2;
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while (isspace(*buf))
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++buf;
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start = simple_strtoul(buf, &buf, 0);
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while (isspace(*buf))
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++buf;
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if (*buf == '-') {
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buf += 1;
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while (isspace(*buf))
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++buf;
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end = simple_strtoul(buf, &buf, 0);
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} else
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end = start;
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pnp_add_io_resource(dev, start, end, 0);
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continue;
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}
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if (!strnicmp(buf, "mem", 3)) {
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buf += 3;
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while (isspace(*buf))
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++buf;
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start = simple_strtoul(buf, &buf, 0);
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while (isspace(*buf))
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++buf;
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if (*buf == '-') {
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buf += 1;
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while (isspace(*buf))
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++buf;
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end = simple_strtoul(buf, &buf, 0);
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} else
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end = start;
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pnp_add_mem_resource(dev, start, end, 0);
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continue;
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}
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if (!strnicmp(buf, "irq", 3)) {
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buf += 3;
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while (isspace(*buf))
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++buf;
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start = simple_strtoul(buf, &buf, 0);
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pnp_add_irq_resource(dev, start, 0);
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continue;
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}
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if (!strnicmp(buf, "dma", 3)) {
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buf += 3;
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while (isspace(*buf))
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++buf;
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start = simple_strtoul(buf, &buf, 0);
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pnp_add_dma_resource(dev, start, 0);
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continue;
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}
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break;
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}
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mutex_unlock(&pnp_res_mutex);
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goto done;
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}
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done:
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if (retval < 0)
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return retval;
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return count;
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}
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static DEVICE_ATTR(resources, S_IRUGO | S_IWUSR,
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pnp_show_current_resources, pnp_set_current_resources);
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static ssize_t pnp_show_current_ids(struct device *dmdev,
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struct device_attribute *attr, char *buf)
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{
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char *str = buf;
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struct pnp_dev *dev = to_pnp_dev(dmdev);
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struct pnp_id *pos = dev->id;
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while (pos) {
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str += sprintf(str, "%s\n", pos->id);
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pos = pos->next;
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}
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return (str - buf);
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}
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static DEVICE_ATTR(id, S_IRUGO, pnp_show_current_ids, NULL);
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int pnp_interface_attach_device(struct pnp_dev *dev)
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{
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int rc = device_create_file(&dev->dev, &dev_attr_options);
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if (rc)
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goto err;
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rc = device_create_file(&dev->dev, &dev_attr_resources);
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if (rc)
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goto err_opt;
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rc = device_create_file(&dev->dev, &dev_attr_id);
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if (rc)
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goto err_res;
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return 0;
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err_res:
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device_remove_file(&dev->dev, &dev_attr_resources);
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err_opt:
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device_remove_file(&dev->dev, &dev_attr_options);
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err:
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return rc;
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}
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