The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_pci_link.c

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    1 /*
    2  * Copyright (c) 2002 Mitsuru IWASAKI <iwasaki@jp.kfreebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: src/sys/dev/acpica/acpi_pci_link.c,v 1.65 2013/04/23 00:40:24 svnexp Exp $
   27  */
   28 
   29 #include "opt_acpi.h"
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 #include <sys/kernel.h>
   33 #include <sys/limits.h>
   34 #include <sys/malloc.h>
   35 #include <sys/module.h>
   36 
   37 #include "acpi.h"
   38 #include <dev/acpica/acpivar.h>
   39 #include <dev/acpica/acpi_pcibvar.h>
   40 #include <dev/acpica/acpi_sci_var.h>
   41 
   42 #include <bus/pci/i386/pci_cfgreg.h>
   43 #include <bus/pci/pcireg.h>
   44 #include <bus/pci/pcivar.h>
   45 #include "pcib_if.h"
   46 
   47 /* Hooks for the ACPI CA debugging infrastructure. */
   48 #define _COMPONENT      ACPI_BUS
   49 ACPI_MODULE_NAME("PCI_LINK")
   50 
   51 ACPI_SERIAL_DECL(pci_link, "ACPI PCI link");
   52 
   53 #define NUM_ISA_INTERRUPTS      16
   54 #define NUM_ACPI_INTERRUPTS     256
   55 
   56 /*
   57  * An ACPI PCI link device may contain multiple links.  Each link has its
   58  * own ACPI resource.  _PRT entries specify which link is being used via
   59  * the Source Index.
   60  *
   61  * XXX: A note about Source Indices and DPFs:  Currently we assume that
   62  * the DPF start and end tags are not counted towards the index that
   63  * Source Index corresponds to.  Also, we assume that when DPFs are in use
   64  * they various sets overlap in terms of Indices.  Here's an example
   65  * resource list indicating these assumptions:
   66  *
   67  * Resource             Index
   68  * --------             -----
   69  * I/O Port             0
   70  * Start DPF            -
   71  * IRQ                  1
   72  * MemIO                2
   73  * Start DPF            -
   74  * IRQ                  1
   75  * MemIO                2
   76  * End DPF              -
   77  * DMA Channel          3
   78  *
   79  * The XXX is because I'm not sure if this is a valid assumption to make.
   80  */
   81 
   82 /* States during DPF processing. */
   83 #define DPF_OUTSIDE     0
   84 #define DPF_FIRST       1
   85 #define DPF_IGNORE      2
   86 
   87 struct link;
   88 
   89 struct acpi_pci_link_softc {
   90         int     pl_num_links;
   91         int     pl_crs_bad;
   92         struct link *pl_links;
   93         device_t pl_dev;
   94 };
   95 
   96 struct link {
   97         struct acpi_pci_link_softc *l_sc;
   98         uint8_t l_bios_irq;
   99         uint8_t l_irq;
  100         uint8_t l_initial_irq;
  101         UINT32  l_crs_type;
  102         int     l_res_index;
  103         int     l_num_irqs;
  104         int     *l_irqs;
  105         int     l_references;
  106         int     l_routed:1;
  107         int     l_isa_irq:1;
  108         ACPI_RESOURCE l_prs_template;
  109 };
  110 
  111 struct link_count_request {
  112         int     in_dpf;
  113         int     count;
  114 };
  115 
  116 struct link_res_request {
  117         struct acpi_pci_link_softc *sc;
  118         int     in_dpf;
  119         int     res_index;
  120         int     link_index;
  121 };
  122 
  123 static MALLOC_DEFINE(M_PCI_LINK, "pci_link", "ACPI PCI Link structures");
  124 
  125 static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS];
  126 static int pci_link_bios_isa_irqs;
  127 
  128 static char *pci_link_ids[] = { "PNP0C0F", NULL };
  129 
  130 /*
  131  * Fetch the short name associated with an ACPI handle and save it in the
  132  * passed in buffer.
  133  */
  134 static ACPI_STATUS
  135 acpi_short_name(ACPI_HANDLE handle, char *buffer, size_t buflen)
  136 {
  137         ACPI_BUFFER buf;
  138 
  139         buf.Length = buflen;
  140         buf.Pointer = buffer;
  141         return (AcpiGetName(handle, ACPI_SINGLE_NAME, &buf));
  142 }
  143 
  144 static int
  145 acpi_pci_link_probe(device_t dev)
  146 {
  147         char descr[28], name[12];
  148 
  149         /*
  150          * We explicitly do not check _STA since not all systems set it to
  151          * sensible values.
  152          */
  153         if (acpi_disabled("pci_link") ||
  154             ACPI_ID_PROBE(device_get_parent(dev), dev, pci_link_ids) == NULL)
  155                 return (ENXIO);
  156 
  157         if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), name,
  158             sizeof(name)))) {
  159                 ksnprintf(descr, sizeof(descr), "ACPI PCI Link %s", name);
  160                 device_set_desc_copy(dev, descr);
  161         } else
  162                 device_set_desc(dev, "ACPI PCI Link");
  163         device_quiet(dev);
  164         return (0);
  165 }
  166 
  167 static ACPI_STATUS
  168 acpi_count_irq_resources(ACPI_RESOURCE *res, void *context)
  169 {
  170         struct link_count_request *req;
  171 
  172         req = (struct link_count_request *)context;
  173         switch (res->Type) {
  174         case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  175                 switch (req->in_dpf) {
  176                 case DPF_OUTSIDE:
  177                         /* We've started the first DPF. */
  178                         req->in_dpf = DPF_FIRST;
  179                         break;
  180                 case DPF_FIRST:
  181                         /* We've started the second DPF. */
  182                         req->in_dpf = DPF_IGNORE;
  183                         break;
  184                 }
  185                 break;
  186         case ACPI_RESOURCE_TYPE_END_DEPENDENT:
  187                 /* We are finished with DPF parsing. */
  188                 KASSERT(req->in_dpf != DPF_OUTSIDE,
  189                     ("%s: end dpf when not parsing a dpf", __func__));
  190                 req->in_dpf = DPF_OUTSIDE;
  191                 break;
  192         case ACPI_RESOURCE_TYPE_IRQ:
  193         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  194                 /*
  195                  * Don't count resources if we are in a DPF set that we are
  196                  * ignoring.
  197                  */
  198                 if (req->in_dpf != DPF_IGNORE)
  199                         req->count++;
  200         }
  201         return (AE_OK);
  202 }
  203 
  204 static ACPI_STATUS
  205 link_add_crs(ACPI_RESOURCE *res, void *context)
  206 {
  207         struct link_res_request *req;
  208         struct link *link;
  209 
  210         ACPI_SERIAL_ASSERT(pci_link);
  211         req = (struct link_res_request *)context;
  212         switch (res->Type) {
  213         case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  214                 switch (req->in_dpf) {
  215                 case DPF_OUTSIDE:
  216                         /* We've started the first DPF. */
  217                         req->in_dpf = DPF_FIRST;
  218                         break;
  219                 case DPF_FIRST:
  220                         /* We've started the second DPF. */
  221                         panic(
  222                 "%s: Multiple dependent functions within a current resource",
  223                             __func__);
  224                         break;
  225                 }
  226                 break;
  227         case ACPI_RESOURCE_TYPE_END_DEPENDENT:
  228                 /* We are finished with DPF parsing. */
  229                 KASSERT(req->in_dpf != DPF_OUTSIDE,
  230                     ("%s: end dpf when not parsing a dpf", __func__));
  231                 req->in_dpf = DPF_OUTSIDE;
  232                 break;
  233         case ACPI_RESOURCE_TYPE_IRQ:
  234         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  235                 KASSERT(req->link_index < req->sc->pl_num_links,
  236                     ("%s: array boundary violation", __func__));
  237                 link = &req->sc->pl_links[req->link_index];
  238                 link->l_res_index = req->res_index;
  239                 link->l_crs_type = res->Type;
  240                 req->link_index++;
  241                 req->res_index++;
  242 
  243                 /*
  244                  * Only use the current value if there's one IRQ.  Some
  245                  * systems return multiple IRQs (which is nonsense for _CRS)
  246                  * when the link hasn't been programmed.
  247                  */
  248                 if (res->Type == ACPI_RESOURCE_TYPE_IRQ) {
  249                         if (res->Data.Irq.InterruptCount == 1)
  250                                 link->l_irq = res->Data.Irq.Interrupts[0];
  251                 } else if (res->Data.ExtendedIrq.InterruptCount == 1)
  252                         link->l_irq = res->Data.ExtendedIrq.Interrupts[0];
  253 
  254                 /*
  255                  * An IRQ of zero means that the link isn't routed.
  256                  */
  257                 if (link->l_irq == 0)
  258                         link->l_irq = PCI_INVALID_IRQ;
  259                 break;
  260         default:
  261                 req->res_index++;
  262         }
  263         return (AE_OK);
  264 }
  265 
  266 /*
  267  * Populate the set of possible IRQs for each device.
  268  */
  269 static ACPI_STATUS
  270 link_add_prs(ACPI_RESOURCE *res, void *context)
  271 {
  272         ACPI_RESOURCE *tmp;
  273         struct link_res_request *req;
  274         struct link *link;
  275         UINT8 *irqs = NULL;
  276         UINT32 *ext_irqs = NULL;
  277         int i, is_ext_irq = 1;
  278 
  279         ACPI_SERIAL_ASSERT(pci_link);
  280         req = (struct link_res_request *)context;
  281         switch (res->Type) {
  282         case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  283                 switch (req->in_dpf) {
  284                 case DPF_OUTSIDE:
  285                         /* We've started the first DPF. */
  286                         req->in_dpf = DPF_FIRST;
  287                         break;
  288                 case DPF_FIRST:
  289                         /* We've started the second DPF. */
  290                         req->in_dpf = DPF_IGNORE;
  291                         break;
  292                 }
  293                 break;
  294         case ACPI_RESOURCE_TYPE_END_DEPENDENT:
  295                 /* We are finished with DPF parsing. */
  296                 KASSERT(req->in_dpf != DPF_OUTSIDE,
  297                     ("%s: end dpf when not parsing a dpf", __func__));
  298                 req->in_dpf = DPF_OUTSIDE;
  299                 break;
  300         case ACPI_RESOURCE_TYPE_IRQ:
  301                 is_ext_irq = 0;
  302                 /* fall through */
  303         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  304                 /*
  305                  * Don't parse resources if we are in a DPF set that we are
  306                  * ignoring.
  307                  */
  308                 if (req->in_dpf == DPF_IGNORE)
  309                         break;
  310 
  311                 KASSERT(req->link_index < req->sc->pl_num_links,
  312                     ("%s: array boundary violation", __func__));
  313                 link = &req->sc->pl_links[req->link_index];
  314                 if (link->l_res_index == -1) {
  315                         KASSERT(req->sc->pl_crs_bad,
  316                             ("res_index should be set"));
  317                         link->l_res_index = req->res_index;
  318                 }
  319                 req->link_index++;
  320                 req->res_index++;
  321 
  322                 /*
  323                  * Stash a copy of the resource for later use when doing
  324                  * _SRS.
  325                  */
  326                 tmp = &link->l_prs_template;
  327                 if (is_ext_irq) {
  328                         bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.ExtendedIrq));
  329 
  330                         /*
  331                          * XXX acpi_AppendBufferResource() cannot handle
  332                          * optional data.
  333                          */
  334                         bzero(&tmp->Data.ExtendedIrq.ResourceSource,
  335                             sizeof(tmp->Data.ExtendedIrq.ResourceSource));
  336                         tmp->Length = ACPI_RS_SIZE(tmp->Data.ExtendedIrq);
  337 
  338                         link->l_num_irqs =
  339                             res->Data.ExtendedIrq.InterruptCount;
  340                         ext_irqs = res->Data.ExtendedIrq.Interrupts;
  341                 } else {
  342                         bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.Irq));
  343                         link->l_num_irqs = res->Data.Irq.InterruptCount;
  344                         irqs = res->Data.Irq.Interrupts;
  345                 }
  346                 if (link->l_num_irqs == 0)
  347                         break;
  348 
  349                 /*
  350                  * Save a list of the valid IRQs.  Also, if all of the
  351                  * valid IRQs are ISA IRQs, then mark this link as
  352                  * routed via an ISA interrupt.
  353                  */
  354                 link->l_isa_irq = TRUE;
  355 
  356                 link->l_irqs = kmalloc(sizeof(int) * link->l_num_irqs,
  357                     M_PCI_LINK, M_WAITOK | M_ZERO);
  358                 for (i = 0; i < link->l_num_irqs; i++) {
  359                         if (is_ext_irq) {
  360                                 link->l_irqs[i] = ext_irqs[i];
  361                                 if (ext_irqs[i] >= NUM_ISA_INTERRUPTS)
  362                                         link->l_isa_irq = FALSE;
  363                         } else {
  364                                 link->l_irqs[i] = irqs[i];
  365                                 if (irqs[i] >= NUM_ISA_INTERRUPTS)
  366                                         link->l_isa_irq = FALSE;
  367                         }
  368                 }
  369 
  370                 /*
  371                  * If this is not an ISA IRQ but _CRS used a non-extended
  372                  * IRQ descriptor, don't use _CRS as a template for _SRS.
  373                  */
  374                 if (!req->sc->pl_crs_bad && !link->l_isa_irq &&
  375                     link->l_crs_type == ACPI_RESOURCE_TYPE_IRQ)
  376                         req->sc->pl_crs_bad = TRUE;
  377                 break;
  378         default:
  379                 if (req->in_dpf == DPF_IGNORE)
  380                         break;
  381                 if (req->sc->pl_crs_bad)
  382                         device_printf(req->sc->pl_dev,
  383                     "Warning: possible resource %d will be lost during _SRS\n",
  384                             req->res_index);
  385                 req->res_index++;
  386         }
  387         return (AE_OK);
  388 }
  389 
  390 static int
  391 link_valid_irq(struct link *link, int irq)
  392 {
  393         int i;
  394 
  395         ACPI_SERIAL_ASSERT(pci_link);
  396 
  397         /* Invalid interrupts are never valid. */
  398         if (!PCI_INTERRUPT_VALID(irq))
  399                 return (FALSE);
  400 
  401         /* Any interrupt in the list of possible interrupts is valid. */
  402         for (i = 0; i < link->l_num_irqs; i++)
  403                 if (link->l_irqs[i] == irq)
  404                          return (TRUE);
  405 
  406         /*
  407          * For links routed via an ISA interrupt, if the SCI is routed via
  408          * an ISA interrupt, the SCI is always treated as a valid IRQ.
  409          */
  410         if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq &&
  411             irq < NUM_ISA_INTERRUPTS)
  412                 return (TRUE);
  413 
  414         /* If the interrupt wasn't found in the list it is not valid. */
  415         return (FALSE);
  416 }
  417 
  418 static void
  419 acpi_pci_link_dump(struct acpi_pci_link_softc *sc, int header, const char *tag)
  420 {
  421         struct link *link;
  422         char buf[16];
  423         int i, j;
  424 
  425         ACPI_SERIAL_ASSERT(pci_link);
  426         if (header) {
  427                 ksnprintf(buf, sizeof(buf), "%s:",
  428                     device_get_nameunit(sc->pl_dev));
  429                 kprintf("%-16.16s  Index  IRQ  Rtd  Ref  IRQs\n", buf);
  430         }
  431         for (i = 0; i < sc->pl_num_links; i++) {
  432                 link = &sc->pl_links[i];
  433                 kprintf("  %-14.14s  %5d  %3d   %c   %3d ", i == 0 ? tag : "", i,
  434                     link->l_irq, link->l_routed ? 'Y' : 'N',
  435                     link->l_references);
  436                 if (link->l_num_irqs == 0)
  437                         kprintf(" none");
  438                 else for (j = 0; j < link->l_num_irqs; j++)
  439                         kprintf(" %d", link->l_irqs[j]);
  440                 kprintf("\n");
  441         }
  442 }
  443 
  444 static int
  445 acpi_pci_link_attach(device_t dev)
  446 {
  447         struct acpi_pci_link_softc *sc;
  448         struct link_count_request creq;
  449         struct link_res_request rreq;
  450         ACPI_STATUS status;
  451         int i;
  452 
  453         sc = device_get_softc(dev);
  454         sc->pl_dev = dev;
  455         ACPI_SERIAL_INIT(pci_link);
  456         ACPI_SERIAL_BEGIN(pci_link);
  457 
  458         /*
  459          * Count the number of current resources so we know how big of
  460          * a link array to allocate.  On some systems, _CRS is broken,
  461          * so for those systems try to derive the count from _PRS instead.
  462          */
  463         creq.in_dpf = DPF_OUTSIDE;
  464         creq.count = 0;
  465         status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
  466             acpi_count_irq_resources, &creq);
  467         sc->pl_crs_bad = ACPI_FAILURE(status);
  468         if (sc->pl_crs_bad) {
  469                 creq.in_dpf = DPF_OUTSIDE;
  470                 creq.count = 0;
  471                 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS",
  472                     acpi_count_irq_resources, &creq);
  473                 if (ACPI_FAILURE(status)) {
  474                         device_printf(dev,
  475                             "Unable to parse _CRS or _PRS: %s\n",
  476                             AcpiFormatException(status));
  477                         ACPI_SERIAL_END(pci_link);
  478                         return (ENXIO);
  479                 }
  480         }
  481         sc->pl_num_links = creq.count;
  482         if (creq.count == 0) {
  483                 ACPI_SERIAL_END(pci_link);
  484                 return (0);
  485         }
  486         sc->pl_links = kmalloc(sizeof(struct link) * sc->pl_num_links,
  487             M_PCI_LINK, M_WAITOK | M_ZERO);
  488 
  489         /* Initialize the child links. */
  490         for (i = 0; i < sc->pl_num_links; i++) {
  491                 sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
  492                 sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ;
  493                 sc->pl_links[i].l_sc = sc;
  494                 sc->pl_links[i].l_isa_irq = FALSE;
  495                 sc->pl_links[i].l_res_index = -1;
  496         }
  497 
  498         /* Try to read the current settings from _CRS if it is valid. */
  499         if (!sc->pl_crs_bad) {
  500                 rreq.in_dpf = DPF_OUTSIDE;
  501                 rreq.link_index = 0;
  502                 rreq.res_index = 0;
  503                 rreq.sc = sc;
  504                 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
  505                     link_add_crs, &rreq);
  506                 if (ACPI_FAILURE(status)) {
  507                         device_printf(dev, "Unable to parse _CRS: %s\n",
  508                             AcpiFormatException(status));
  509                         goto fail;
  510                 }
  511         }
  512 
  513         /*
  514          * Try to read the possible settings from _PRS.  Note that if the
  515          * _CRS is toast, we depend on having a working _PRS.  However, if
  516          * _CRS works, then it is ok for _PRS to be missing.
  517          */
  518         rreq.in_dpf = DPF_OUTSIDE;
  519         rreq.link_index = 0;
  520         rreq.res_index = 0;
  521         rreq.sc = sc;
  522         status = AcpiWalkResources(acpi_get_handle(dev), "_PRS",
  523             link_add_prs, &rreq);
  524         if (ACPI_FAILURE(status) &&
  525             (status != AE_NOT_FOUND || sc->pl_crs_bad)) {
  526                 device_printf(dev, "Unable to parse _PRS: %s\n",
  527                     AcpiFormatException(status));
  528                 goto fail;
  529         }
  530         if (bootverbose)
  531                 acpi_pci_link_dump(sc, 1, "Initial Probe");
  532 
  533         /* Verify initial IRQs if we have _PRS. */
  534         if (status != AE_NOT_FOUND)
  535                 for (i = 0; i < sc->pl_num_links; i++)
  536                         if (!link_valid_irq(&sc->pl_links[i],
  537                             sc->pl_links[i].l_irq))
  538                                 sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
  539         if (bootverbose)
  540                 acpi_pci_link_dump(sc, 0, "Validation");
  541 
  542         /* Save initial IRQs. */
  543         for (i = 0; i < sc->pl_num_links; i++)
  544                 sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq;
  545 
  546         /*
  547          * Try to disable this link.  If successful, set the current IRQ to
  548          * zero and flags to indicate this link is not routed.  If we can't
  549          * run _DIS (i.e., the method doesn't exist), assume the initial
  550          * IRQ was routed by the BIOS.
  551          */
  552         if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL,
  553             NULL)))
  554                 for (i = 0; i < sc->pl_num_links; i++)
  555                         sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
  556         else
  557                 for (i = 0; i < sc->pl_num_links; i++)
  558                         if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq))
  559                                 sc->pl_links[i].l_routed = TRUE;
  560         if (bootverbose)
  561                 acpi_pci_link_dump(sc, 0, "After Disable");
  562         ACPI_SERIAL_END(pci_link);
  563         return (0);
  564 fail:
  565         ACPI_SERIAL_END(pci_link);
  566         for (i = 0; i < sc->pl_num_links; i++)
  567                 if (sc->pl_links[i].l_irqs != NULL)
  568                         kfree(sc->pl_links[i].l_irqs, M_PCI_LINK);
  569         kfree(sc->pl_links, M_PCI_LINK);
  570         return (ENXIO);
  571 }
  572 
  573 /* XXX: Note that this is identical to pci_pir_search_irq(). */
  574 static uint8_t
  575 acpi_pci_link_search_irq(int bus, int device, int pin)
  576 {
  577         uint32_t value;
  578         uint8_t func, maxfunc;
  579 
  580         /* See if we have a valid device at function 0. */
  581         value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
  582         if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
  583                 return (PCI_INVALID_IRQ);
  584         if (value & PCIM_MFDEV)
  585                 maxfunc = PCI_FUNCMAX;
  586         else
  587                 maxfunc = 0;
  588 
  589         /* Scan all possible functions at this device. */
  590         for (func = 0; func <= maxfunc; func++) {
  591                 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
  592                 if (value == 0xffffffff)
  593                         continue;
  594                 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
  595 
  596                 /*
  597                  * See if it uses the pin in question.  Note that the passed
  598                  * in pin uses 0 for A, .. 3 for D whereas the intpin
  599                  * register uses 0 for no interrupt, 1 for A, .. 4 for D.
  600                  */
  601                 if (value != pin + 1)
  602                         continue;
  603                 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
  604                 if (bootverbose)
  605                         kprintf(
  606                 "ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n",
  607                             bus, device, pin + 'A', func, value);
  608                 if (value != PCI_INVALID_IRQ)
  609                         return (value);
  610         }
  611         return (PCI_INVALID_IRQ);
  612 }
  613 
  614 /*
  615  * Find the link structure that corresponds to the resource index passed in
  616  * via 'source_index'.
  617  */
  618 static struct link *
  619 acpi_pci_link_lookup(device_t dev, int source_index)
  620 {
  621         struct acpi_pci_link_softc *sc;
  622         int i;
  623 
  624         ACPI_SERIAL_ASSERT(pci_link);
  625         sc = device_get_softc(dev);
  626         for (i = 0; i < sc->pl_num_links; i++)
  627                 if (sc->pl_links[i].l_res_index == source_index)
  628                         return (&sc->pl_links[i]);
  629         return (NULL);
  630 }
  631 
  632 void
  633 acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
  634     int pin)
  635 {
  636         struct link *link;
  637         uint8_t bios_irq;
  638         uintptr_t bus;
  639 
  640         /*
  641          * Look up the PCI bus for the specified PCI bridge device.  Note
  642          * that the PCI bridge device might not have any children yet.
  643          * However, looking up its bus number doesn't require a valid child
  644          * device, so we just pass NULL.
  645          */
  646         if (BUS_READ_IVAR(pcib, NULL, PCIB_IVAR_BUS, &bus) != 0) {
  647                 device_printf(pcib, "Unable to read PCI bus number");
  648                 panic("PCI bridge without a bus number");
  649         }
  650 
  651         /* Bump the reference count. */
  652         ACPI_SERIAL_BEGIN(pci_link);
  653         link = acpi_pci_link_lookup(dev, index);
  654         if (link == NULL) {
  655                 device_printf(dev, "apparently invalid index %d\n", index);
  656                 ACPI_SERIAL_END(pci_link);
  657                 return;
  658         }
  659         link->l_references++;
  660         if (link->l_routed)
  661                 pci_link_interrupt_weights[link->l_irq]++;
  662 
  663         /*
  664          * The BIOS only routes interrupts via ISA IRQs using the ATPICs
  665          * (8259As).  Thus, if this link is routed via an ISA IRQ, go
  666          * look to see if the BIOS routed an IRQ for this link at the
  667          * indicated (bus, slot, pin).  If so, we prefer that IRQ for
  668          * this link and add that IRQ to our list of known-good IRQs.
  669          * This provides a good work-around for link devices whose _CRS
  670          * method is either broken or bogus.  We only use the value
  671          * returned by _CRS if we can't find a valid IRQ via this method
  672          * in fact.
  673          *
  674          * If this link is not routed via an ISA IRQ (because we are using
  675          * APIC for example), then don't bother looking up the BIOS IRQ
  676          * as if we find one it won't be valid anyway.
  677          */
  678         if (!link->l_isa_irq) {
  679                 ACPI_SERIAL_END(pci_link);
  680                 return;
  681         }
  682 
  683         /* Try to find a BIOS IRQ setting from any matching devices. */
  684         bios_irq = acpi_pci_link_search_irq(bus, slot, pin);
  685         if (!PCI_INTERRUPT_VALID(bios_irq)) {
  686                 ACPI_SERIAL_END(pci_link);
  687                 return;
  688         }
  689 
  690         /* Validate the BIOS IRQ. */
  691         if (!link_valid_irq(link, bios_irq)) {
  692                 device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n",
  693                     bios_irq, (int)bus, slot, pin + 'A');
  694         } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) {
  695                 link->l_bios_irq = bios_irq;
  696                 /*
  697                  * SCI setting is handled by acpi_pci_link_identify()
  698                  */
  699                 if (bios_irq < NUM_ISA_INTERRUPTS &&
  700                     AcpiGbl_FADT.SciInterrupt != bios_irq)
  701                         pci_link_bios_isa_irqs |= (1 << bios_irq);
  702                 if (bios_irq != link->l_initial_irq &&
  703                     PCI_INTERRUPT_VALID(link->l_initial_irq))
  704                         device_printf(dev,
  705                             "BIOS IRQ %u does not match initial IRQ %u\n",
  706                             bios_irq, link->l_initial_irq);
  707         } else if (bios_irq != link->l_bios_irq)
  708                 device_printf(dev,
  709             "BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n",
  710                     bios_irq, (int)bus, slot, pin + 'A',
  711                     link->l_bios_irq);
  712         ACPI_SERIAL_END(pci_link);
  713 }
  714 
  715 static ACPI_STATUS
  716 acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf)
  717 {
  718         ACPI_RESOURCE *end, *res;
  719         ACPI_STATUS status;
  720         struct link *link;
  721         int i, in_dpf;
  722 
  723         /* Fetch the _CRS. */
  724         ACPI_SERIAL_ASSERT(pci_link);
  725         srsbuf->Pointer = NULL;
  726         srsbuf->Length = ACPI_ALLOCATE_BUFFER;
  727         status = AcpiGetCurrentResources(acpi_get_handle(sc->pl_dev), srsbuf);
  728         if (ACPI_SUCCESS(status) && srsbuf->Pointer == NULL)
  729                 status = AE_NO_MEMORY;
  730         if (ACPI_FAILURE(status)) {
  731                 if (bootverbose)
  732                         device_printf(sc->pl_dev,
  733                             "Unable to fetch current resources: %s\n",
  734                             AcpiFormatException(status));
  735                 return (status);
  736         }
  737 
  738         /* Fill in IRQ resources via link structures. */
  739         link = sc->pl_links;
  740         i = 0;
  741         in_dpf = DPF_OUTSIDE;
  742         res = (ACPI_RESOURCE *)srsbuf->Pointer;
  743         end = (ACPI_RESOURCE *)((char *)srsbuf->Pointer + srsbuf->Length);
  744         for (;;) {
  745                 switch (res->Type) {
  746                 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  747                         switch (in_dpf) {
  748                         case DPF_OUTSIDE:
  749                                 /* We've started the first DPF. */
  750                                 in_dpf = DPF_FIRST;
  751                                 break;
  752                         case DPF_FIRST:
  753                                 /* We've started the second DPF. */
  754                                 panic(
  755                 "%s: Multiple dependent functions within a current resource",
  756                                     __func__);
  757                                 break;
  758                         }
  759                         break;
  760                 case ACPI_RESOURCE_TYPE_END_DEPENDENT:
  761                         /* We are finished with DPF parsing. */
  762                         KASSERT(in_dpf != DPF_OUTSIDE,
  763                             ("%s: end dpf when not parsing a dpf", __func__));
  764                         in_dpf = DPF_OUTSIDE;
  765                         break;
  766                 case ACPI_RESOURCE_TYPE_IRQ:
  767                         KKASSERT(i < sc->pl_num_links);
  768                         res->Data.Irq.InterruptCount = 1;
  769                         if (PCI_INTERRUPT_VALID(link->l_irq)) {
  770                                 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS,
  771                 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type",
  772                                     __func__, link->l_irq));
  773                                 res->Data.Irq.Interrupts[0] = link->l_irq;
  774                         } else
  775                                 res->Data.Irq.Interrupts[0] = 0;
  776                         link++;
  777                         i++;
  778                         break;
  779                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  780                         KKASSERT(i < sc->pl_num_links);
  781                         res->Data.ExtendedIrq.InterruptCount = 1;
  782                         if (PCI_INTERRUPT_VALID(link->l_irq))
  783                                 res->Data.ExtendedIrq.Interrupts[0] =
  784                                     link->l_irq;
  785                         else
  786                                 res->Data.ExtendedIrq.Interrupts[0] = 0;
  787                         link++;
  788                         i++;
  789                         break;
  790                 }
  791                 if (res->Type == ACPI_RESOURCE_TYPE_END_TAG)
  792                         break;
  793                 res = ACPI_NEXT_RESOURCE(res);
  794                 if (res >= end)
  795                         break;
  796         }
  797         return (AE_OK);
  798 }
  799 
  800 static ACPI_STATUS
  801 acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc,
  802     ACPI_BUFFER *srsbuf)
  803 {
  804         ACPI_RESOURCE newres;
  805         ACPI_STATUS status;
  806         struct link *link;
  807         int i;
  808 
  809         /* Start off with an empty buffer. */
  810         srsbuf->Pointer = NULL;
  811         link = sc->pl_links;
  812         for (i = 0; i < sc->pl_num_links; i++) {
  813 
  814                 /* Add a new IRQ resource from each link. */
  815                 link = &sc->pl_links[i];
  816                 if (link->l_prs_template.Type == ACPI_RESOURCE_TYPE_IRQ) {
  817 
  818                         /* Build an IRQ resource. */
  819                         bcopy(&link->l_prs_template, &newres,
  820                             ACPI_RS_SIZE(newres.Data.Irq));
  821                         newres.Data.Irq.InterruptCount = 1;
  822                         if (PCI_INTERRUPT_VALID(link->l_irq)) {
  823                                 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS,
  824                 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type",
  825                                     __func__, link->l_irq));
  826                                 newres.Data.Irq.Interrupts[0] = link->l_irq;
  827                         } else
  828                                 newres.Data.Irq.Interrupts[0] = 0;
  829                 } else {
  830 
  831                         /* Build an ExtIRQ resuorce. */
  832                         bcopy(&link->l_prs_template, &newres,
  833                             ACPI_RS_SIZE(newres.Data.ExtendedIrq));
  834                         newres.Data.ExtendedIrq.InterruptCount = 1;
  835                         if (PCI_INTERRUPT_VALID(link->l_irq))
  836                                 newres.Data.ExtendedIrq.Interrupts[0] =
  837                                     link->l_irq;
  838                         else
  839                                 newres.Data.ExtendedIrq.Interrupts[0] = 0;
  840                 }
  841 
  842                 /* Add the new resource to the end of the _SRS buffer. */
  843                 status = acpi_AppendBufferResource(srsbuf, &newres);
  844                 if (ACPI_FAILURE(status)) {
  845                         device_printf(sc->pl_dev,
  846                             "Unable to build resources: %s\n",
  847                             AcpiFormatException(status));
  848                         if (srsbuf->Pointer != NULL)
  849                                 AcpiOsFree(srsbuf->Pointer);
  850                         return (status);
  851                 }
  852         }
  853         return (AE_OK);
  854 }
  855 
  856 static ACPI_STATUS
  857 acpi_pci_link_route_irqs(device_t dev)
  858 {
  859         struct acpi_pci_link_softc *sc;
  860         ACPI_RESOURCE *resource, *end;
  861         ACPI_BUFFER srsbuf;
  862         ACPI_STATUS status;
  863         struct link *link;
  864         int i;
  865 
  866         ACPI_SERIAL_ASSERT(pci_link);
  867         sc = device_get_softc(dev);
  868         if (sc->pl_crs_bad)
  869                 status = acpi_pci_link_srs_from_links(sc, &srsbuf);
  870         else
  871                 status = acpi_pci_link_srs_from_crs(sc, &srsbuf);
  872 
  873         /* Write out new resources via _SRS. */
  874         status = AcpiSetCurrentResources(acpi_get_handle(dev), &srsbuf);
  875         if (ACPI_FAILURE(status)) {
  876                 device_printf(dev, "Unable to route IRQs: %s\n",
  877                     AcpiFormatException(status));
  878                 AcpiOsFree(srsbuf.Pointer);
  879                 return (status);
  880         }
  881 
  882         /*
  883          * Perform acpi_config_intr() on each IRQ resource if it was just
  884          * routed for the first time.
  885          */
  886         link = sc->pl_links;
  887         i = 0;
  888         resource = (ACPI_RESOURCE *)srsbuf.Pointer;
  889         end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length);
  890         for (;;) {
  891                 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG)
  892                         break;
  893                 switch (resource->Type) {
  894                 case ACPI_RESOURCE_TYPE_IRQ:
  895                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  896                         KKASSERT(i < sc->pl_num_links);
  897 
  898                         /*
  899                          * Only configure the interrupt and update the
  900                          * weights if this link has a valid IRQ and was
  901                          * previously unrouted.
  902                          */
  903                         if (!link->l_routed &&
  904                             PCI_INTERRUPT_VALID(link->l_irq)) {
  905                                 link->l_routed = TRUE;
  906                                 acpi_config_intr(dev, resource);
  907                                 pci_link_interrupt_weights[link->l_irq] +=
  908                                     link->l_references;
  909                         }
  910                         link++;
  911                         i++;
  912                         break;
  913                 }
  914                 resource = ACPI_NEXT_RESOURCE(resource);
  915                 if (resource >= end)
  916                         break;
  917         }
  918         AcpiOsFree(srsbuf.Pointer);
  919         return (AE_OK);
  920 }
  921 
  922 static int
  923 acpi_pci_link_resume(device_t dev)
  924 {
  925         struct acpi_pci_link_softc *sc;
  926         ACPI_STATUS status;
  927         int i, routed;
  928 
  929         /*
  930          * If all of our links are routed, then restore the link via _SRS,
  931          * otherwise, disable the link via _DIS.
  932          */
  933         ACPI_SERIAL_BEGIN(pci_link);
  934         sc = device_get_softc(dev);
  935         routed = 0;
  936         for (i = 0; i < sc->pl_num_links; i++)
  937                 if (sc->pl_links[i].l_routed)
  938                         routed++;
  939         if (routed == sc->pl_num_links)
  940                 status = acpi_pci_link_route_irqs(dev);
  941         else {
  942                 AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, NULL);
  943                 status = AE_OK;
  944         }
  945         ACPI_SERIAL_END(pci_link);
  946         if (ACPI_FAILURE(status))
  947                 return (ENXIO);
  948         else
  949                 return (0);
  950 }
  951 
  952 /*
  953  * Pick an IRQ to use for this unrouted link.
  954  */
  955 static uint8_t
  956 acpi_pci_link_choose_irq(device_t dev, struct link *link)
  957 {
  958         char tunable_buffer[64], link_name[5];
  959         u_int8_t best_irq, pos_irq;
  960         int best_weight, pos_weight, i;
  961 
  962         KASSERT(!link->l_routed, ("%s: link already routed", __func__));
  963         KASSERT(!PCI_INTERRUPT_VALID(link->l_irq),
  964             ("%s: link already has an IRQ", __func__));
  965 
  966         /* Check for a tunable override. */
  967         if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), link_name,
  968             sizeof(link_name)))) {
  969                 ksnprintf(tunable_buffer, sizeof(tunable_buffer),
  970                     "hw.pci.link.%s.%d.irq", link_name, link->l_res_index);
  971                 if (kgetenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) {
  972                         if (!link_valid_irq(link, i))
  973                                 device_printf(dev,
  974                                     "Warning, IRQ %d is not listed as valid\n",
  975                                     i);
  976                         return (i);
  977                 }
  978                 ksnprintf(tunable_buffer, sizeof(tunable_buffer),
  979                     "hw.pci.link.%s.irq", link_name);
  980                 if (kgetenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) {
  981                         if (!link_valid_irq(link, i))
  982                                 device_printf(dev,
  983                                     "Warning, IRQ %d is not listed as valid\n",
  984                                     i);
  985                         return (i);
  986                 }
  987         }
  988 
  989         /*
  990          * If we have a valid BIOS IRQ, use that.  We trust what the BIOS
  991          * says it routed over what _CRS says the link thinks is routed.
  992          */
  993         if (PCI_INTERRUPT_VALID(link->l_bios_irq))
  994                 return (link->l_bios_irq);
  995 
  996         /*
  997          * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS,
  998          * then use that.
  999          */
 1000         if (PCI_INTERRUPT_VALID(link->l_initial_irq))
 1001                 return (link->l_initial_irq);
 1002 
 1003         /*
 1004          * Ok, we have no useful hints, so we have to pick from the
 1005          * possible IRQs.  For ISA IRQs we only use interrupts that
 1006          * have already been used by the BIOS.
 1007          */
 1008         best_irq = PCI_INVALID_IRQ;
 1009         best_weight = INT_MAX;
 1010         for (i = 0; i < link->l_num_irqs; i++) {
 1011                 pos_irq = link->l_irqs[i];
 1012                 if (pos_irq < NUM_ISA_INTERRUPTS &&
 1013                     (pci_link_bios_isa_irqs & 1 << pos_irq) == 0)
 1014                         continue;
 1015                 pos_weight = pci_link_interrupt_weights[pos_irq];
 1016                 if (pos_weight < best_weight) {
 1017                         best_weight = pos_weight;
 1018                         best_irq = pos_irq;
 1019                 }
 1020         }
 1021 
 1022         /*
 1023          * If this is an ISA IRQ and SCI could be shared, try using
 1024          * the SCI as a fallback.
 1025          */
 1026         if (link->l_isa_irq && acpi_sci_pci_shareable()) {
 1027                 pos_irq = AcpiGbl_FADT.SciInterrupt;
 1028                 pos_weight = pci_link_interrupt_weights[pos_irq];
 1029                 if (pos_weight < best_weight) {
 1030                         best_weight = pos_weight;
 1031                         best_irq = pos_irq;
 1032                 }
 1033         }
 1034 
 1035         if (PCI_INTERRUPT_VALID(best_irq)) {
 1036                 if (bootverbose)
 1037                         device_printf(dev, "Picked IRQ %u with weight %d\n",
 1038                             best_irq, best_weight);
 1039         } else
 1040                 device_printf(dev, "Unable to choose an IRQ\n");
 1041         return (best_irq);
 1042 }
 1043 
 1044 int
 1045 acpi_pci_link_route_interrupt(device_t dev, int index)
 1046 {
 1047         struct link *link;
 1048 
 1049         if (acpi_disabled("pci_link"))
 1050                 return (PCI_INVALID_IRQ);
 1051 
 1052         ACPI_SERIAL_BEGIN(pci_link);
 1053         link = acpi_pci_link_lookup(dev, index);
 1054         if (link == NULL)
 1055                 panic("%s: apparently invalid index %d", __func__, index);
 1056 
 1057         /*
 1058          * If this link device is already routed to an interrupt, just return
 1059          * the interrupt it is routed to.
 1060          */
 1061         if (link->l_routed) {
 1062                 KASSERT(PCI_INTERRUPT_VALID(link->l_irq),
 1063                     ("%s: link is routed but has an invalid IRQ", __func__));
 1064                 ACPI_SERIAL_END(pci_link);
 1065                 return (link->l_irq);
 1066         }
 1067 
 1068         /* Choose an IRQ if we need one. */
 1069         if (!PCI_INTERRUPT_VALID(link->l_irq)) {
 1070                 link->l_irq = acpi_pci_link_choose_irq(dev, link);
 1071 
 1072                 /*
 1073                  * Try to route the interrupt we picked.  If it fails, then
 1074                  * assume the interrupt is not routed.
 1075                  */
 1076                 if (PCI_INTERRUPT_VALID(link->l_irq)) {
 1077                         acpi_pci_link_route_irqs(dev);
 1078                         if (!link->l_routed)
 1079                                 link->l_irq = PCI_INVALID_IRQ;
 1080                 }
 1081         }
 1082         ACPI_SERIAL_END(pci_link);
 1083         return (link->l_irq);
 1084 }
 1085 
 1086 /*
 1087  * This is gross, but we abuse the identify routine to perform one-time
 1088  * SYSINIT() style initialization for the driver.
 1089  */
 1090 static void
 1091 acpi_pci_link_identify(driver_t *driver, device_t parent)
 1092 {
 1093         /*
 1094          * If the SCI is an ISA IRQ and could be shared,
 1095          * add it to the bitmask of known good ISA IRQs.
 1096          */
 1097         if (AcpiGbl_FADT.SciInterrupt < NUM_ISA_INTERRUPTS &&
 1098             acpi_sci_pci_shareable())
 1099                 pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt);
 1100 }
 1101 
 1102 static device_method_t acpi_pci_link_methods[] = {
 1103         /* Device interface */
 1104         DEVMETHOD(device_identify,      acpi_pci_link_identify),
 1105         DEVMETHOD(device_probe,         acpi_pci_link_probe),
 1106         DEVMETHOD(device_attach,        acpi_pci_link_attach),
 1107         DEVMETHOD(device_resume,        acpi_pci_link_resume),
 1108 
 1109         DEVMETHOD_END
 1110 };
 1111 
 1112 static driver_t acpi_pci_link_driver = {
 1113         "pci_link",
 1114         acpi_pci_link_methods,
 1115         sizeof(struct acpi_pci_link_softc),
 1116 };
 1117 
 1118 static devclass_t pci_link_devclass;
 1119 
 1120 DRIVER_MODULE(acpi_pci_link, acpi, acpi_pci_link_driver, pci_link_devclass,
 1121     NULL, NULL);
 1122 MODULE_DEPEND(acpi_pci_link, acpi, 1, 1, 1);

Cache object: a3bbf4667bff8be50998865e8652b36c


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