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.freebsd.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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/9.0/sys/dev/acpica/acpi_pci_link.c 214849 2010-11-05 20:24:26Z jkim $");
   29 
   30 #include "opt_acpi.h"
   31 #include <sys/param.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/limits.h>
   35 #include <sys/malloc.h>
   36 #include <sys/module.h>
   37 
   38 #include <contrib/dev/acpica/include/acpi.h>
   39 
   40 #include <dev/acpica/acpivar.h>
   41 #include <dev/acpica/acpi_pcibvar.h>
   42 
   43 #include <machine/pci_cfgreg.h>
   44 #include <dev/pci/pcireg.h>
   45 #include <dev/pci/pcivar.h>
   46 #include "pcib_if.h"
   47 
   48 /* Hooks for the ACPI CA debugging infrastructure. */
   49 #define _COMPONENT      ACPI_BUS
   50 ACPI_MODULE_NAME("PCI_LINK")
   51 
   52 ACPI_SERIAL_DECL(pci_link, "ACPI PCI link");
   53 
   54 #define NUM_ISA_INTERRUPTS      16
   55 #define NUM_ACPI_INTERRUPTS     256
   56 
   57 /*
   58  * An ACPI PCI link device may contain multiple links.  Each link has its
   59  * own ACPI resource.  _PRT entries specify which link is being used via
   60  * the Source Index.
   61  *
   62  * XXX: A note about Source Indices and DPFs:  Currently we assume that
   63  * the DPF start and end tags are not counted towards the index that
   64  * Source Index corresponds to.  Also, we assume that when DPFs are in use
   65  * they various sets overlap in terms of Indices.  Here's an example
   66  * resource list indicating these assumptions:
   67  *
   68  * Resource             Index
   69  * --------             -----
   70  * I/O Port             0
   71  * Start DPF            -
   72  * IRQ                  1
   73  * MemIO                2
   74  * Start DPF            -
   75  * IRQ                  1
   76  * MemIO                2
   77  * End DPF              -
   78  * DMA Channel          3
   79  *
   80  * The XXX is because I'm not sure if this is a valid assumption to make.
   81  */
   82 
   83 /* States during DPF processing. */
   84 #define DPF_OUTSIDE     0
   85 #define DPF_FIRST       1
   86 #define DPF_IGNORE      2
   87 
   88 struct link;
   89 
   90 struct acpi_pci_link_softc {
   91         int     pl_num_links;
   92         int     pl_crs_bad;
   93         struct link *pl_links;
   94         device_t pl_dev;
   95 };
   96 
   97 struct link {
   98         struct acpi_pci_link_softc *l_sc;
   99         uint8_t l_bios_irq;
  100         uint8_t l_irq;
  101         uint8_t l_initial_irq;
  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 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                 snprintf(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                 req->link_index++;
  240                 req->res_index++;
  241 
  242                 /*
  243                  * Only use the current value if there's one IRQ.  Some
  244                  * systems return multiple IRQs (which is nonsense for _CRS)
  245                  * when the link hasn't been programmed.
  246                  */
  247                 if (res->Type == ACPI_RESOURCE_TYPE_IRQ) {
  248                         if (res->Data.Irq.InterruptCount == 1)
  249                                 link->l_irq = res->Data.Irq.Interrupts[0];
  250                 } else if (res->Data.ExtendedIrq.InterruptCount == 1)
  251                         link->l_irq = res->Data.ExtendedIrq.Interrupts[0];
  252 
  253                 /*
  254                  * An IRQ of zero means that the link isn't routed.
  255                  */
  256                 if (link->l_irq == 0)
  257                         link->l_irq = PCI_INVALID_IRQ;
  258                 break;
  259         default:
  260                 req->res_index++;
  261         }
  262         return (AE_OK);
  263 }
  264 
  265 /*
  266  * Populate the set of possible IRQs for each device.
  267  */
  268 static ACPI_STATUS
  269 link_add_prs(ACPI_RESOURCE *res, void *context)
  270 {
  271         ACPI_RESOURCE *tmp;
  272         struct link_res_request *req;
  273         struct link *link;
  274         UINT8 *irqs = NULL;
  275         UINT32 *ext_irqs = NULL;
  276         int i, is_ext_irq = 1;
  277 
  278         ACPI_SERIAL_ASSERT(pci_link);
  279         req = (struct link_res_request *)context;
  280         switch (res->Type) {
  281         case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  282                 switch (req->in_dpf) {
  283                 case DPF_OUTSIDE:
  284                         /* We've started the first DPF. */
  285                         req->in_dpf = DPF_FIRST;
  286                         break;
  287                 case DPF_FIRST:
  288                         /* We've started the second DPF. */
  289                         req->in_dpf = DPF_IGNORE;
  290                         break;
  291                 }
  292                 break;
  293         case ACPI_RESOURCE_TYPE_END_DEPENDENT:
  294                 /* We are finished with DPF parsing. */
  295                 KASSERT(req->in_dpf != DPF_OUTSIDE,
  296                     ("%s: end dpf when not parsing a dpf", __func__));
  297                 req->in_dpf = DPF_OUTSIDE;
  298                 break;
  299         case ACPI_RESOURCE_TYPE_IRQ:
  300                 is_ext_irq = 0;
  301                 /* fall through */
  302         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  303                 /*
  304                  * Don't parse resources if we are in a DPF set that we are
  305                  * ignoring.
  306                  */
  307                 if (req->in_dpf == DPF_IGNORE)
  308                         break;
  309 
  310                 KASSERT(req->link_index < req->sc->pl_num_links,
  311                     ("%s: array boundary violation", __func__));
  312                 link = &req->sc->pl_links[req->link_index];
  313                 if (link->l_res_index == -1) {
  314                         KASSERT(req->sc->pl_crs_bad,
  315                             ("res_index should be set"));
  316                         link->l_res_index = req->res_index;
  317                 }
  318                 req->link_index++;
  319                 req->res_index++;
  320 
  321                 /*
  322                  * Stash a copy of the resource for later use when doing
  323                  * _SRS.
  324                  */
  325                 tmp = &link->l_prs_template;
  326                 if (is_ext_irq) {
  327                         bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.ExtendedIrq));
  328 
  329                         /*
  330                          * XXX acpi_AppendBufferResource() cannot handle
  331                          * optional data.
  332                          */
  333                         bzero(&tmp->Data.ExtendedIrq.ResourceSource,
  334                             sizeof(tmp->Data.ExtendedIrq.ResourceSource));
  335                         tmp->Length = ACPI_RS_SIZE(tmp->Data.ExtendedIrq);
  336 
  337                         link->l_num_irqs =
  338                             res->Data.ExtendedIrq.InterruptCount;
  339                         ext_irqs = res->Data.ExtendedIrq.Interrupts;
  340                 } else {
  341                         bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.Irq));
  342                         link->l_num_irqs = res->Data.Irq.InterruptCount;
  343                         irqs = res->Data.Irq.Interrupts;
  344                 }
  345                 if (link->l_num_irqs == 0)
  346                         break;
  347 
  348                 /*
  349                  * Save a list of the valid IRQs.  Also, if all of the
  350                  * valid IRQs are ISA IRQs, then mark this link as
  351                  * routed via an ISA interrupt.
  352                  */
  353                 link->l_isa_irq = TRUE;
  354                 link->l_irqs = malloc(sizeof(int) * link->l_num_irqs,
  355                     M_PCI_LINK, M_WAITOK | M_ZERO);
  356                 for (i = 0; i < link->l_num_irqs; i++) {
  357                         if (is_ext_irq) {
  358                                 link->l_irqs[i] = ext_irqs[i];
  359                                 if (ext_irqs[i] >= NUM_ISA_INTERRUPTS)
  360                                         link->l_isa_irq = FALSE;
  361                         } else {
  362                                 link->l_irqs[i] = irqs[i];
  363                                 if (irqs[i] >= NUM_ISA_INTERRUPTS)
  364                                         link->l_isa_irq = FALSE;
  365                         }
  366                 }
  367                 break;
  368         default:
  369                 if (req->in_dpf == DPF_IGNORE)
  370                         break;
  371                 if (req->sc->pl_crs_bad)
  372                         device_printf(req->sc->pl_dev,
  373                     "Warning: possible resource %d will be lost during _SRS\n",
  374                             req->res_index);
  375                 req->res_index++;
  376         }
  377         return (AE_OK);
  378 }
  379 
  380 static int
  381 link_valid_irq(struct link *link, int irq)
  382 {
  383         int i;
  384 
  385         ACPI_SERIAL_ASSERT(pci_link);
  386 
  387         /* Invalid interrupts are never valid. */
  388         if (!PCI_INTERRUPT_VALID(irq))
  389                 return (FALSE);
  390 
  391         /* Any interrupt in the list of possible interrupts is valid. */
  392         for (i = 0; i < link->l_num_irqs; i++)
  393                 if (link->l_irqs[i] == irq)
  394                          return (TRUE);
  395 
  396         /*
  397          * For links routed via an ISA interrupt, if the SCI is routed via
  398          * an ISA interrupt, the SCI is always treated as a valid IRQ.
  399          */
  400         if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq &&
  401             irq < NUM_ISA_INTERRUPTS)
  402                 return (TRUE);
  403 
  404         /* If the interrupt wasn't found in the list it is not valid. */
  405         return (FALSE);
  406 }
  407 
  408 static void
  409 acpi_pci_link_dump(struct acpi_pci_link_softc *sc, int header, const char *tag)
  410 {
  411         struct link *link;
  412         char buf[16];
  413         int i, j;
  414 
  415         ACPI_SERIAL_ASSERT(pci_link);
  416         if (header) {
  417                 snprintf(buf, sizeof(buf), "%s:",
  418                     device_get_nameunit(sc->pl_dev));
  419                 printf("%-16.16s  Index  IRQ  Rtd  Ref  IRQs\n", buf);
  420         }
  421         for (i = 0; i < sc->pl_num_links; i++) {
  422                 link = &sc->pl_links[i];
  423                 printf("  %-14.14s  %5d  %3d   %c   %3d ", i == 0 ? tag : "", i,
  424                     link->l_irq, link->l_routed ? 'Y' : 'N',
  425                     link->l_references);
  426                 if (link->l_num_irqs == 0)
  427                         printf(" none");
  428                 else for (j = 0; j < link->l_num_irqs; j++)
  429                         printf(" %d", link->l_irqs[j]);
  430                 printf("\n");
  431         }
  432 }
  433 
  434 static int
  435 acpi_pci_link_attach(device_t dev)
  436 {
  437         struct acpi_pci_link_softc *sc;
  438         struct link_count_request creq;
  439         struct link_res_request rreq;
  440         ACPI_STATUS status;
  441         int i;
  442 
  443         sc = device_get_softc(dev);
  444         sc->pl_dev = dev;
  445         ACPI_SERIAL_BEGIN(pci_link);
  446 
  447         /*
  448          * Count the number of current resources so we know how big of
  449          * a link array to allocate.  On some systems, _CRS is broken,
  450          * so for those systems try to derive the count from _PRS instead.
  451          */
  452         creq.in_dpf = DPF_OUTSIDE;
  453         creq.count = 0;
  454         status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
  455             acpi_count_irq_resources, &creq);
  456         sc->pl_crs_bad = ACPI_FAILURE(status);
  457         if (sc->pl_crs_bad) {
  458                 creq.in_dpf = DPF_OUTSIDE;
  459                 creq.count = 0;
  460                 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS",
  461                     acpi_count_irq_resources, &creq);
  462                 if (ACPI_FAILURE(status)) {
  463                         device_printf(dev,
  464                             "Unable to parse _CRS or _PRS: %s\n",
  465                             AcpiFormatException(status));
  466                         ACPI_SERIAL_END(pci_link);
  467                         return (ENXIO);
  468                 }
  469         }
  470         sc->pl_num_links = creq.count;
  471         if (creq.count == 0) {
  472                 ACPI_SERIAL_END(pci_link);
  473                 return (0);
  474         }
  475         sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links,
  476             M_PCI_LINK, M_WAITOK | M_ZERO);
  477 
  478         /* Initialize the child links. */
  479         for (i = 0; i < sc->pl_num_links; i++) {
  480                 sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
  481                 sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ;
  482                 sc->pl_links[i].l_sc = sc;
  483                 sc->pl_links[i].l_isa_irq = FALSE;
  484                 sc->pl_links[i].l_res_index = -1;
  485         }
  486 
  487         /* Try to read the current settings from _CRS if it is valid. */
  488         if (!sc->pl_crs_bad) {
  489                 rreq.in_dpf = DPF_OUTSIDE;
  490                 rreq.link_index = 0;
  491                 rreq.res_index = 0;
  492                 rreq.sc = sc;
  493                 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
  494                     link_add_crs, &rreq);
  495                 if (ACPI_FAILURE(status)) {
  496                         device_printf(dev, "Unable to parse _CRS: %s\n",
  497                             AcpiFormatException(status));
  498                         goto fail;
  499                 }
  500         }
  501 
  502         /*
  503          * Try to read the possible settings from _PRS.  Note that if the
  504          * _CRS is toast, we depend on having a working _PRS.  However, if
  505          * _CRS works, then it is ok for _PRS to be missing.
  506          */
  507         rreq.in_dpf = DPF_OUTSIDE;
  508         rreq.link_index = 0;
  509         rreq.res_index = 0;
  510         rreq.sc = sc;
  511         status = AcpiWalkResources(acpi_get_handle(dev), "_PRS",
  512             link_add_prs, &rreq);
  513         if (ACPI_FAILURE(status) &&
  514             (status != AE_NOT_FOUND || sc->pl_crs_bad)) {
  515                 device_printf(dev, "Unable to parse _PRS: %s\n",
  516                     AcpiFormatException(status));
  517                 goto fail;
  518         }
  519         if (bootverbose)
  520                 acpi_pci_link_dump(sc, 1, "Initial Probe");
  521 
  522         /* Verify initial IRQs if we have _PRS. */
  523         if (status != AE_NOT_FOUND)
  524                 for (i = 0; i < sc->pl_num_links; i++)
  525                         if (!link_valid_irq(&sc->pl_links[i],
  526                             sc->pl_links[i].l_irq))
  527                                 sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
  528         if (bootverbose)
  529                 acpi_pci_link_dump(sc, 0, "Validation");
  530 
  531         /* Save initial IRQs. */
  532         for (i = 0; i < sc->pl_num_links; i++)
  533                 sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq;
  534 
  535         /*
  536          * Try to disable this link.  If successful, set the current IRQ to
  537          * zero and flags to indicate this link is not routed.  If we can't
  538          * run _DIS (i.e., the method doesn't exist), assume the initial
  539          * IRQ was routed by the BIOS.
  540          */
  541         if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL,
  542             NULL)))
  543                 for (i = 0; i < sc->pl_num_links; i++)
  544                         sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
  545         else
  546                 for (i = 0; i < sc->pl_num_links; i++)
  547                         if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq))
  548                                 sc->pl_links[i].l_routed = TRUE;
  549         if (bootverbose)
  550                 acpi_pci_link_dump(sc, 0, "After Disable");
  551         ACPI_SERIAL_END(pci_link);
  552         return (0);
  553 fail:
  554         ACPI_SERIAL_END(pci_link);
  555         for (i = 0; i < sc->pl_num_links; i++)
  556                 if (sc->pl_links[i].l_irqs != NULL)
  557                         free(sc->pl_links[i].l_irqs, M_PCI_LINK);
  558         free(sc->pl_links, M_PCI_LINK);
  559         return (ENXIO);
  560 }
  561 
  562 /* XXX: Note that this is identical to pci_pir_search_irq(). */
  563 static uint8_t
  564 acpi_pci_link_search_irq(int bus, int device, int pin)
  565 {
  566         uint32_t value;
  567         uint8_t func, maxfunc;
  568 
  569         /* See if we have a valid device at function 0. */
  570         value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
  571         if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
  572                 return (PCI_INVALID_IRQ);
  573         if (value & PCIM_MFDEV)
  574                 maxfunc = PCI_FUNCMAX;
  575         else
  576                 maxfunc = 0;
  577 
  578         /* Scan all possible functions at this device. */
  579         for (func = 0; func <= maxfunc; func++) {
  580                 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
  581                 if (value == 0xffffffff)
  582                         continue;
  583                 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
  584 
  585                 /*
  586                  * See if it uses the pin in question.  Note that the passed
  587                  * in pin uses 0 for A, .. 3 for D whereas the intpin
  588                  * register uses 0 for no interrupt, 1 for A, .. 4 for D.
  589                  */
  590                 if (value != pin + 1)
  591                         continue;
  592                 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
  593                 if (bootverbose)
  594                         printf(
  595                 "ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n",
  596                             bus, device, pin + 'A', func, value);
  597                 if (value != PCI_INVALID_IRQ)
  598                         return (value);
  599         }
  600         return (PCI_INVALID_IRQ);
  601 }
  602 
  603 /*
  604  * Find the link structure that corresponds to the resource index passed in
  605  * via 'source_index'.
  606  */
  607 static struct link *
  608 acpi_pci_link_lookup(device_t dev, int source_index)
  609 {
  610         struct acpi_pci_link_softc *sc;
  611         int i;
  612 
  613         ACPI_SERIAL_ASSERT(pci_link);
  614         sc = device_get_softc(dev);
  615         for (i = 0; i < sc->pl_num_links; i++)
  616                 if (sc->pl_links[i].l_res_index == source_index)
  617                         return (&sc->pl_links[i]);
  618         return (NULL);
  619 }
  620 
  621 void
  622 acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
  623     int pin)
  624 {
  625         struct link *link;
  626         uint8_t bios_irq;
  627         uintptr_t bus;
  628 
  629         /*
  630          * Look up the PCI bus for the specified PCI bridge device.  Note
  631          * that the PCI bridge device might not have any children yet.
  632          * However, looking up its bus number doesn't require a valid child
  633          * device, so we just pass NULL.
  634          */
  635         if (BUS_READ_IVAR(pcib, NULL, PCIB_IVAR_BUS, &bus) != 0) {
  636                 device_printf(pcib, "Unable to read PCI bus number");
  637                 panic("PCI bridge without a bus number");
  638         }
  639                 
  640         /* Bump the reference count. */
  641         ACPI_SERIAL_BEGIN(pci_link);
  642         link = acpi_pci_link_lookup(dev, index);
  643         if (link == NULL) {
  644                 device_printf(dev, "apparently invalid index %d\n", index);
  645                 ACPI_SERIAL_END(pci_link);
  646                 return;
  647         }
  648         link->l_references++;
  649         if (link->l_routed)
  650                 pci_link_interrupt_weights[link->l_irq]++;
  651 
  652         /*
  653          * The BIOS only routes interrupts via ISA IRQs using the ATPICs
  654          * (8259As).  Thus, if this link is routed via an ISA IRQ, go
  655          * look to see if the BIOS routed an IRQ for this link at the
  656          * indicated (bus, slot, pin).  If so, we prefer that IRQ for
  657          * this link and add that IRQ to our list of known-good IRQs.
  658          * This provides a good work-around for link devices whose _CRS
  659          * method is either broken or bogus.  We only use the value
  660          * returned by _CRS if we can't find a valid IRQ via this method
  661          * in fact.
  662          *
  663          * If this link is not routed via an ISA IRQ (because we are using
  664          * APIC for example), then don't bother looking up the BIOS IRQ
  665          * as if we find one it won't be valid anyway.
  666          */
  667         if (!link->l_isa_irq) {
  668                 ACPI_SERIAL_END(pci_link);
  669                 return;
  670         }
  671 
  672         /* Try to find a BIOS IRQ setting from any matching devices. */
  673         bios_irq = acpi_pci_link_search_irq(bus, slot, pin);
  674         if (!PCI_INTERRUPT_VALID(bios_irq)) {
  675                 ACPI_SERIAL_END(pci_link);
  676                 return;
  677         }
  678 
  679         /* Validate the BIOS IRQ. */
  680         if (!link_valid_irq(link, bios_irq)) {
  681                 device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n",
  682                     bios_irq, (int)bus, slot, pin + 'A');
  683         } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) {
  684                 link->l_bios_irq = bios_irq;
  685                 if (bios_irq < NUM_ISA_INTERRUPTS)
  686                         pci_link_bios_isa_irqs |= (1 << bios_irq);
  687                 if (bios_irq != link->l_initial_irq &&
  688                     PCI_INTERRUPT_VALID(link->l_initial_irq))
  689                         device_printf(dev,
  690                             "BIOS IRQ %u does not match initial IRQ %u\n",
  691                             bios_irq, link->l_initial_irq);
  692         } else if (bios_irq != link->l_bios_irq)
  693                 device_printf(dev,
  694             "BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n",
  695                     bios_irq, (int)bus, slot, pin + 'A',
  696                     link->l_bios_irq);
  697         ACPI_SERIAL_END(pci_link);
  698 }
  699 
  700 static ACPI_STATUS
  701 acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf)
  702 {
  703         ACPI_RESOURCE *end, *res;
  704         ACPI_STATUS status;
  705         struct link *link;
  706         int i, in_dpf;
  707 
  708         /* Fetch the _CRS. */
  709         ACPI_SERIAL_ASSERT(pci_link);
  710         srsbuf->Pointer = NULL;
  711         srsbuf->Length = ACPI_ALLOCATE_BUFFER;
  712         status = AcpiGetCurrentResources(acpi_get_handle(sc->pl_dev), srsbuf);
  713         if (ACPI_SUCCESS(status) && srsbuf->Pointer == NULL)
  714                 status = AE_NO_MEMORY;
  715         if (ACPI_FAILURE(status)) {
  716                 if (bootverbose)
  717                         device_printf(sc->pl_dev,
  718                             "Unable to fetch current resources: %s\n",
  719                             AcpiFormatException(status));
  720                 return (status);
  721         }
  722 
  723         /* Fill in IRQ resources via link structures. */
  724         link = sc->pl_links;
  725         i = 0;
  726         in_dpf = DPF_OUTSIDE;
  727         res = (ACPI_RESOURCE *)srsbuf->Pointer;
  728         end = (ACPI_RESOURCE *)((char *)srsbuf->Pointer + srsbuf->Length);
  729         for (;;) {
  730                 switch (res->Type) {
  731                 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
  732                         switch (in_dpf) {
  733                         case DPF_OUTSIDE:
  734                                 /* We've started the first DPF. */
  735                                 in_dpf = DPF_FIRST;
  736                                 break;
  737                         case DPF_FIRST:
  738                                 /* We've started the second DPF. */
  739                                 panic(
  740                 "%s: Multiple dependent functions within a current resource",
  741                                     __func__);
  742                                 break;
  743                         }
  744                         break;
  745                 case ACPI_RESOURCE_TYPE_END_DEPENDENT:
  746                         /* We are finished with DPF parsing. */
  747                         KASSERT(in_dpf != DPF_OUTSIDE,
  748                             ("%s: end dpf when not parsing a dpf", __func__));
  749                         in_dpf = DPF_OUTSIDE;
  750                         break;
  751                 case ACPI_RESOURCE_TYPE_IRQ:
  752                         MPASS(i < sc->pl_num_links);
  753                         res->Data.Irq.InterruptCount = 1;
  754                         if (PCI_INTERRUPT_VALID(link->l_irq)) {
  755                                 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS,
  756                 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type",
  757                                     __func__, link->l_irq));
  758                                 res->Data.Irq.Interrupts[0] = link->l_irq;
  759                         } else
  760                                 res->Data.Irq.Interrupts[0] = 0;
  761                         link++;
  762                         i++;
  763                         break;
  764                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  765                         MPASS(i < sc->pl_num_links);
  766                         res->Data.ExtendedIrq.InterruptCount = 1;
  767                         if (PCI_INTERRUPT_VALID(link->l_irq))
  768                                 res->Data.ExtendedIrq.Interrupts[0] =
  769                                     link->l_irq;
  770                         else
  771                                 res->Data.ExtendedIrq.Interrupts[0] = 0;
  772                         link++;
  773                         i++;
  774                         break;
  775                 }
  776                 if (res->Type == ACPI_RESOURCE_TYPE_END_TAG)
  777                         break;
  778                 res = ACPI_NEXT_RESOURCE(res);
  779                 if (res >= end)
  780                         break;
  781         }
  782         return (AE_OK);
  783 }
  784 
  785 static ACPI_STATUS
  786 acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc,
  787     ACPI_BUFFER *srsbuf)
  788 {
  789         ACPI_RESOURCE newres;
  790         ACPI_STATUS status;
  791         struct link *link;
  792         int i;
  793 
  794         /* Start off with an empty buffer. */
  795         srsbuf->Pointer = NULL;
  796         link = sc->pl_links;
  797         for (i = 0; i < sc->pl_num_links; i++) {
  798 
  799                 /* Add a new IRQ resource from each link. */
  800                 link = &sc->pl_links[i];
  801                 if (link->l_prs_template.Type == ACPI_RESOURCE_TYPE_IRQ) {
  802 
  803                         /* Build an IRQ resource. */
  804                         bcopy(&link->l_prs_template, &newres,
  805                             ACPI_RS_SIZE(newres.Data.Irq));
  806                         newres.Data.Irq.InterruptCount = 1;
  807                         if (PCI_INTERRUPT_VALID(link->l_irq)) {
  808                                 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS,
  809                 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type",
  810                                     __func__, link->l_irq));
  811                                 newres.Data.Irq.Interrupts[0] = link->l_irq;
  812                         } else
  813                                 newres.Data.Irq.Interrupts[0] = 0;
  814                 } else {
  815 
  816                         /* Build an ExtIRQ resuorce. */
  817                         bcopy(&link->l_prs_template, &newres,
  818                             ACPI_RS_SIZE(newres.Data.ExtendedIrq));
  819                         newres.Data.ExtendedIrq.InterruptCount = 1;
  820                         if (PCI_INTERRUPT_VALID(link->l_irq))
  821                                 newres.Data.ExtendedIrq.Interrupts[0] =
  822                                     link->l_irq;
  823                         else
  824                                 newres.Data.ExtendedIrq.Interrupts[0] = 0;
  825                 }
  826 
  827                 /* Add the new resource to the end of the _SRS buffer. */
  828                 status = acpi_AppendBufferResource(srsbuf, &newres);
  829                 if (ACPI_FAILURE(status)) {
  830                         device_printf(sc->pl_dev,
  831                             "Unable to build resources: %s\n",
  832                             AcpiFormatException(status));
  833                         if (srsbuf->Pointer != NULL)
  834                                 AcpiOsFree(srsbuf->Pointer);
  835                         return (status);
  836                 }
  837         }
  838         return (AE_OK);
  839 }
  840 
  841 static ACPI_STATUS
  842 acpi_pci_link_route_irqs(device_t dev)
  843 {
  844         struct acpi_pci_link_softc *sc;
  845         ACPI_RESOURCE *resource, *end;
  846         ACPI_BUFFER srsbuf;
  847         ACPI_STATUS status;
  848         struct link *link;
  849         int i;
  850 
  851         ACPI_SERIAL_ASSERT(pci_link);
  852         sc = device_get_softc(dev);
  853         if (sc->pl_crs_bad)
  854                 status = acpi_pci_link_srs_from_links(sc, &srsbuf);
  855         else
  856                 status = acpi_pci_link_srs_from_crs(sc, &srsbuf);
  857 
  858         /* Write out new resources via _SRS. */
  859         status = AcpiSetCurrentResources(acpi_get_handle(dev), &srsbuf);
  860         if (ACPI_FAILURE(status)) {
  861                 device_printf(dev, "Unable to route IRQs: %s\n",
  862                     AcpiFormatException(status));
  863                 AcpiOsFree(srsbuf.Pointer);
  864                 return (status);
  865         }
  866 
  867         /*
  868          * Perform acpi_config_intr() on each IRQ resource if it was just
  869          * routed for the first time.
  870          */
  871         link = sc->pl_links;
  872         i = 0;
  873         resource = (ACPI_RESOURCE *)srsbuf.Pointer;
  874         end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length);
  875         for (;;) {
  876                 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG)
  877                         break;
  878                 switch (resource->Type) {
  879                 case ACPI_RESOURCE_TYPE_IRQ:
  880                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  881                         MPASS(i < sc->pl_num_links);
  882 
  883                         /*
  884                          * Only configure the interrupt and update the
  885                          * weights if this link has a valid IRQ and was
  886                          * previously unrouted.
  887                          */
  888                         if (!link->l_routed &&
  889                             PCI_INTERRUPT_VALID(link->l_irq)) {
  890                                 link->l_routed = TRUE;
  891                                 acpi_config_intr(dev, resource);
  892                                 pci_link_interrupt_weights[link->l_irq] +=
  893                                     link->l_references;
  894                         }
  895                         link++;
  896                         i++;
  897                         break;
  898                 }
  899                 resource = ACPI_NEXT_RESOURCE(resource);
  900                 if (resource >= end)
  901                         break;
  902         }
  903         AcpiOsFree(srsbuf.Pointer);
  904         return (AE_OK);
  905 }
  906 
  907 static int
  908 acpi_pci_link_resume(device_t dev)
  909 {
  910         struct acpi_pci_link_softc *sc;
  911         ACPI_STATUS status;
  912         int i, routed;
  913 
  914         /*
  915          * If all of our links are routed, then restore the link via _SRS,
  916          * otherwise, disable the link via _DIS.
  917          */
  918         ACPI_SERIAL_BEGIN(pci_link);
  919         sc = device_get_softc(dev);
  920         routed = 0;
  921         for (i = 0; i < sc->pl_num_links; i++)
  922                 if (sc->pl_links[i].l_routed)
  923                         routed++;
  924         if (routed == sc->pl_num_links)
  925                 status = acpi_pci_link_route_irqs(dev);
  926         else {
  927                 AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, NULL);
  928                 status = AE_OK;
  929         }
  930         ACPI_SERIAL_END(pci_link);
  931         if (ACPI_FAILURE(status))
  932                 return (ENXIO);
  933         else
  934                 return (0);
  935 }
  936 
  937 /*
  938  * Pick an IRQ to use for this unrouted link.
  939  */
  940 static uint8_t
  941 acpi_pci_link_choose_irq(device_t dev, struct link *link)
  942 {
  943         char tunable_buffer[64], link_name[5];
  944         u_int8_t best_irq, pos_irq;
  945         int best_weight, pos_weight, i;
  946 
  947         KASSERT(!link->l_routed, ("%s: link already routed", __func__));
  948         KASSERT(!PCI_INTERRUPT_VALID(link->l_irq),
  949             ("%s: link already has an IRQ", __func__));
  950 
  951         /* Check for a tunable override. */
  952         if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), link_name,
  953             sizeof(link_name)))) {
  954                 snprintf(tunable_buffer, sizeof(tunable_buffer),
  955                     "hw.pci.link.%s.%d.irq", link_name, link->l_res_index);
  956                 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) {
  957                         if (!link_valid_irq(link, i))
  958                                 device_printf(dev,
  959                                     "Warning, IRQ %d is not listed as valid\n",
  960                                     i);
  961                         return (i);
  962                 }
  963                 snprintf(tunable_buffer, sizeof(tunable_buffer),
  964                     "hw.pci.link.%s.irq", link_name);
  965                 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) {
  966                         if (!link_valid_irq(link, i))
  967                                 device_printf(dev,
  968                                     "Warning, IRQ %d is not listed as valid\n",
  969                                     i);
  970                         return (i);
  971                 }
  972         }
  973 
  974         /*
  975          * If we have a valid BIOS IRQ, use that.  We trust what the BIOS
  976          * says it routed over what _CRS says the link thinks is routed.
  977          */
  978         if (PCI_INTERRUPT_VALID(link->l_bios_irq))
  979                 return (link->l_bios_irq);
  980 
  981         /*
  982          * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS,
  983          * then use that.
  984          */
  985         if (PCI_INTERRUPT_VALID(link->l_initial_irq))
  986                 return (link->l_initial_irq);
  987 
  988         /*
  989          * Ok, we have no useful hints, so we have to pick from the
  990          * possible IRQs.  For ISA IRQs we only use interrupts that
  991          * have already been used by the BIOS.
  992          */
  993         best_irq = PCI_INVALID_IRQ;
  994         best_weight = INT_MAX;
  995         for (i = 0; i < link->l_num_irqs; i++) {
  996                 pos_irq = link->l_irqs[i];
  997                 if (pos_irq < NUM_ISA_INTERRUPTS &&
  998                     (pci_link_bios_isa_irqs & 1 << pos_irq) == 0)
  999                         continue;
 1000                 pos_weight = pci_link_interrupt_weights[pos_irq];
 1001                 if (pos_weight < best_weight) {
 1002                         best_weight = pos_weight;
 1003                         best_irq = pos_irq;
 1004                 }
 1005         }
 1006 
 1007         /*
 1008          * If this is an ISA IRQ, try using the SCI if it is also an ISA
 1009          * interrupt as a fallback.
 1010          */
 1011         if (link->l_isa_irq) {
 1012                 pos_irq = AcpiGbl_FADT.SciInterrupt;
 1013                 pos_weight = pci_link_interrupt_weights[pos_irq];
 1014                 if (pos_weight < best_weight) {
 1015                         best_weight = pos_weight;
 1016                         best_irq = pos_irq;
 1017                 }
 1018         }
 1019 
 1020         if (PCI_INTERRUPT_VALID(best_irq)) {
 1021                 if (bootverbose)
 1022                         device_printf(dev, "Picked IRQ %u with weight %d\n",
 1023                             best_irq, best_weight);
 1024         } else
 1025                 device_printf(dev, "Unable to choose an IRQ\n");
 1026         return (best_irq);
 1027 }
 1028 
 1029 int
 1030 acpi_pci_link_route_interrupt(device_t dev, int index)
 1031 {
 1032         struct link *link;
 1033 
 1034         if (acpi_disabled("pci_link"))
 1035                 return (PCI_INVALID_IRQ);
 1036 
 1037         ACPI_SERIAL_BEGIN(pci_link);
 1038         link = acpi_pci_link_lookup(dev, index);
 1039         if (link == NULL)
 1040                 panic("%s: apparently invalid index %d", __func__, index);
 1041 
 1042         /*
 1043          * If this link device is already routed to an interrupt, just return
 1044          * the interrupt it is routed to.
 1045          */
 1046         if (link->l_routed) {
 1047                 KASSERT(PCI_INTERRUPT_VALID(link->l_irq),
 1048                     ("%s: link is routed but has an invalid IRQ", __func__));
 1049                 ACPI_SERIAL_END(pci_link);
 1050                 return (link->l_irq);
 1051         }
 1052 
 1053         /* Choose an IRQ if we need one. */
 1054         if (!PCI_INTERRUPT_VALID(link->l_irq)) {
 1055                 link->l_irq = acpi_pci_link_choose_irq(dev, link);
 1056 
 1057                 /*
 1058                  * Try to route the interrupt we picked.  If it fails, then
 1059                  * assume the interrupt is not routed.
 1060                  */
 1061                 if (PCI_INTERRUPT_VALID(link->l_irq)) {
 1062                         acpi_pci_link_route_irqs(dev);
 1063                         if (!link->l_routed)
 1064                                 link->l_irq = PCI_INVALID_IRQ;
 1065                 }
 1066         }
 1067         ACPI_SERIAL_END(pci_link);
 1068 
 1069         return (link->l_irq);
 1070 }
 1071 
 1072 /*
 1073  * This is gross, but we abuse the identify routine to perform one-time
 1074  * SYSINIT() style initialization for the driver.
 1075  */
 1076 static void
 1077 acpi_pci_link_identify(driver_t *driver, device_t parent)
 1078 {
 1079 
 1080         /*
 1081          * If the SCI is an ISA IRQ, add it to the bitmask of known good
 1082          * ISA IRQs.
 1083          *
 1084          * XXX: If we are using the APIC, the SCI might have been
 1085          * rerouted to an APIC pin in which case this is invalid.  However,
 1086          * if we are using the APIC, we also shouldn't be having any PCI
 1087          * interrupts routed via ISA IRQs, so this is probably ok.
 1088          */
 1089         if (AcpiGbl_FADT.SciInterrupt < NUM_ISA_INTERRUPTS)
 1090                 pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt);
 1091 }
 1092 
 1093 static device_method_t acpi_pci_link_methods[] = {
 1094         /* Device interface */
 1095         DEVMETHOD(device_identify,      acpi_pci_link_identify),
 1096         DEVMETHOD(device_probe,         acpi_pci_link_probe),
 1097         DEVMETHOD(device_attach,        acpi_pci_link_attach),
 1098         DEVMETHOD(device_resume,        acpi_pci_link_resume),
 1099 
 1100         {0, 0}
 1101 };
 1102 
 1103 static driver_t acpi_pci_link_driver = {
 1104         "pci_link",
 1105         acpi_pci_link_methods,
 1106         sizeof(struct acpi_pci_link_softc),
 1107 };
 1108 
 1109 static devclass_t pci_link_devclass;
 1110 
 1111 DRIVER_MODULE(acpi_pci_link, acpi, acpi_pci_link_driver, pci_link_devclass, 0,
 1112     0);
 1113 MODULE_DEPEND(acpi_pci_link, acpi, 1, 1, 1);

Cache object: 9c6956be5f7a8487a18e4cb45f7e729a


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