Date: Fri, 29 Oct 2010 02:25:38 +0200 From: Attilio Rao <attilio@freebsd.org> To: John Baldwin <jhb@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r214457 - in head/sys: amd64/amd64 conf i386/i386 x86/x86 Message-ID: <AANLkTim0if81oH=S6LkCDDgpePD44NEPt%2BqSWHaOSK=C@mail.gmail.com> In-Reply-To: <201010281638.14043.jhb@freebsd.org> References: <201010281631.o9SGVdtZ014923@svn.freebsd.org> <201010281411.40423.jhb@freebsd.org> <AANLkTi=5oMOtVVVtnuG0BFEnLyzHnParq7QixgMaPJ1m@mail.gmail.com> <201010281638.14043.jhb@freebsd.org>
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2010/10/28 John Baldwin <jhb@freebsd.org>: > On Thursday, October 28, 2010 4:28:12 pm Attilio Rao wrote: >> 2010/10/28 John Baldwin <jhb@freebsd.org>: >> > On Thursday, October 28, 2010 1:21:34 pm Attilio Rao wrote: >> >> 2010/10/28 John Baldwin <jhb@freebsd.org>: >> >> > On Thursday, October 28, 2010 12:31:39 pm Attilio Rao wrote: >> >> >> Author: attilio >> >> >> Date: Thu Oct 28 16:31:39 2010 >> >> >> New Revision: 214457 >> >> >> URL: http://svn.freebsd.org/changeset/base/214457 >> >> >> >> >> >> Log: >> >> >> =C2=A0 Merge nexus.c from amd64 and i386 to x86 subtree. >> >> >> >> >> >> =C2=A0 Sponsored by: =C2=A0 =C2=A0 =C2=A0 Sandvine Incorporated >> >> >> =C2=A0 Tested by: =C2=A0gianni >> >> >> >> >> > >> >> > It would be better to merge these two routines. =C2=A0The loader no= w passes > the >> >> > smap to i386 kernels as well, so ram_attach() should probably be > changed to >> >> > try the amd64 approach first and if that fails fall back to using t= he >> >> > phys_avail[] array instead. >> >> >> >> What do you think about this patch?: >> >> Index: nexus.c >> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> >> --- nexus.c =C2=A0 =C2=A0 (revision 214457) >> >> +++ nexus.c =C2=A0 =C2=A0 (working copy) >> >> @@ -52,9 +52,7 @@ >> >> =C2=A0#include <sys/systm.h> >> >> =C2=A0#include <sys/bus.h> >> >> =C2=A0#include <sys/kernel.h> >> >> -#ifdef __amd64__ >> >> =C2=A0#include <sys/linker.h> >> >> -#endif >> >> =C2=A0#include <sys/malloc.h> >> >> =C2=A0#include <sys/module.h> >> >> =C2=A0#include <machine/bus.h> >> >> @@ -67,12 +65,10 @@ >> >> =C2=A0#include <vm/pmap.h> >> >> =C2=A0#include <machine/pmap.h> >> >> >> >> -#ifdef __amd64__ >> >> =C2=A0#include <machine/metadata.h> >> >> -#include <machine/pc/bios.h> >> >> -#endif >> >> =C2=A0#include <machine/nexusvar.h> >> >> =C2=A0#include <machine/resource.h> >> >> +#include <machine/pc/bios.h> >> >> >> >> =C2=A0#ifdef DEV_APIC >> >> =C2=A0#include "pcib_if.h" >> >> @@ -89,11 +85,13 @@ >> >> =C2=A0#include <sys/rtprio.h> >> >> >> >> =C2=A0#ifdef __amd64__ >> >> -#define =C2=A0 =C2=A0 =C2=A0 =C2=A0RMAN_BUS_SPACE_IO =C2=A0 =C2=A0 = =C2=A0 AMD64_BUS_SPACE_IO >> >> -#define =C2=A0 =C2=A0 =C2=A0 =C2=A0RMAN_BUS_SPACE_MEM =C2=A0 =C2=A0 = =C2=A0AMD64_BUS_SPACE_MEM >> >> +#define =C2=A0 =C2=A0 =C2=A0 =C2=A0X86_BUS_SPACE_IO =C2=A0 =C2=A0 = =C2=A0 =C2=A0AMD64_BUS_SPACE_IO >> >> +#define =C2=A0 =C2=A0 =C2=A0 =C2=A0X86_BUS_SPACE_MEM =C2=A0 =C2=A0 = =C2=A0 AMD64_BUS_SPACE_MEM >> >> +#define =C2=A0 =C2=A0 =C2=A0 =C2=A0ELF_KERN_STR =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0"elf64 kernel" >> >> =C2=A0#else >> >> -#define =C2=A0 =C2=A0 =C2=A0 =C2=A0RMAN_BUS_SPACE_IO =C2=A0 =C2=A0 = =C2=A0 I386_BUS_SPACE_IO >> >> -#define =C2=A0 =C2=A0 =C2=A0 =C2=A0RMAN_BUS_SPACE_MEM =C2=A0 =C2=A0 = =C2=A0I386_BUS_SPACE_MEM >> >> +#define =C2=A0 =C2=A0 =C2=A0 =C2=A0X86_BUS_SPACE_IO =C2=A0 =C2=A0 = =C2=A0 =C2=A0I386_BUS_SPACE_IO >> >> +#define =C2=A0 =C2=A0 =C2=A0 =C2=A0X86_BUS_SPACE_MEM =C2=A0 =C2=A0 = =C2=A0 I386_BUS_SPACE_MEM >> >> +#define =C2=A0 =C2=A0 =C2=A0 =C2=A0ELF_KERN_STR =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0"elf32 kernel" >> >> =C2=A0#endif >> >> @@ -701,16 +699,11 @@ >> >> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 panic("ram_attach: resource %d failed to attach", > rid); >> >> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 rid++; >> >> =C2=A0 =C2=A0 =C2=A0 =C2=A0 } >> >> - =C2=A0 =C2=A0 =C2=A0 return (0); >> >> -} >> >> -#else >> >> -static int >> >> -ram_attach(device_t dev) >> >> -{ >> >> - =C2=A0 =C2=A0 =C2=A0 struct resource *res; >> >> - =C2=A0 =C2=A0 =C2=A0 vm_paddr_t *p; >> >> - =C2=A0 =C2=A0 =C2=A0 int error, i, rid; >> >> >> >> + =C2=A0 =C2=A0 =C2=A0 /* If at least one smap attached, return. */ >> >> + =C2=A0 =C2=A0 =C2=A0 if (rid !=3D 0) >> >> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return (0); >> >> + >> > >> > Perhaps this instead: >> > >> > =C2=A0 =C2=A0 =C2=A0 =C2=A0/* If we found an SMAP, return. */ >> > =C2=A0 =C2=A0 =C2=A0 =C2=A0if (smapbase !=3D NULL) >> > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return (0); >> >> No, I don't think this check is right, smapbase will always be !=3D NULL >> (otherwise the code panics). > > Oh, that needs to be fixed then. =C2=A0It can be NULL on i386 with an old= loader > (or on a really old machine without an SMAP). =C2=A0The amd64 nexus code = could > assume it would never be NULL, but i386 cannot. > > It should probably more closely match what i386 does during the memory pr= obe > which is: > > =C2=A0 =C2=A0 =C2=A0 =C2=A0kmdp =3D search("elf kernel"); > =C2=A0 =C2=A0 =C2=A0 =C2=A0if (kmdp =3D=3D NULL) > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0kmdp =3D search("e= lfXX kernel"); > =C2=A0 =C2=A0 =C2=A0 =C2=A0if (kmdp !=3D NULL) > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0smapbase =3D prelo= ad_search(...); > =C2=A0 =C2=A0 =C2=A0 =C2=A0else > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0smapbase =3D NULL; > =C2=A0 =C2=A0 =C2=A0 =C2=A0if (smapbase !=3D NULL) { > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0for (smap =3D ...)= { > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0} > > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return (0); > =C2=A0 =C2=A0 =C2=A0 =C2=A0} > > =C2=A0 =C2=A0 =C2=A0 =C2=A0/* fall through to old i386 code using phys_av= ail[] */ This further patch should address your concerns about nexus.c: Index: nexus.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- nexus.c (revision 214457) +++ nexus.c (working copy) @@ -52,9 +52,7 @@ #include <sys/systm.h> #include <sys/bus.h> #include <sys/kernel.h> -#ifdef __amd64__ #include <sys/linker.h> -#endif #include <sys/malloc.h> #include <sys/module.h> #include <machine/bus.h> @@ -67,12 +65,10 @@ #include <vm/pmap.h> #include <machine/pmap.h> -#ifdef __amd64__ #include <machine/metadata.h> -#include <machine/pc/bios.h> -#endif #include <machine/nexusvar.h> #include <machine/resource.h> +#include <machine/pc/bios.h> #ifdef DEV_APIC #include "pcib_if.h" @@ -89,13 +85,15 @@ #include <sys/rtprio.h> #ifdef __amd64__ -#define RMAN_BUS_SPACE_IO AMD64_BUS_SPACE_IO -#define RMAN_BUS_SPACE_MEM AMD64_BUS_SPACE_MEM +#define BUS_SPACE_IO AMD64_BUS_SPACE_IO +#define BUS_SPACE_MEM AMD64_BUS_SPACE_MEM #else -#define RMAN_BUS_SPACE_IO I386_BUS_SPACE_IO -#define RMAN_BUS_SPACE_MEM I386_BUS_SPACE_MEM +#define BUS_SPACE_IO I386_BUS_SPACE_IO +#define BUS_SPACE_MEM I386_BUS_SPACE_MEM #endif +#define ELF_KERN_STR ("elf"__XSTRING(__ELF_WORD_SIZE)" kernel") + static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) @@ -435,7 +433,7 @@ #else rman_set_bushandle(r, rman_get_start(r)); #endif - rman_set_bustag(r, RMAN_BUS_SPACE_IO); + rman_set_bustag(r, BUS_SPACE_IO); break; case SYS_RES_MEMORY: #ifdef PC98 @@ -446,7 +444,7 @@ #endif vaddr =3D pmap_mapdev(rman_get_start(r), rman_get_size(r)); rman_set_virtual(r, vaddr); - rman_set_bustag(r, RMAN_BUS_SPACE_MEM); + rman_set_bustag(r, BUS_SPACE_MEM); #ifdef PC98 /* PC-98: the type of bus_space_handle_t is the structure. = */ bh->bsh_base =3D (bus_addr_t) vaddr; @@ -668,48 +666,45 @@ return (0); } -#ifdef __amd64__ static int ram_attach(device_t dev) { struct bios_smap *smapbase, *smap, *smapend; struct resource *res; + vm_paddr_t *p; caddr_t kmdp; uint32_t smapsize; - int error, rid; + int error, i, rid; /* Retrieve the system memory map from the loader. */ kmdp =3D preload_search_by_type("elf kernel"); if (kmdp =3D=3D NULL) - kmdp =3D preload_search_by_type("elf64 kernel"); - smapbase =3D (struct bios_smap *)preload_search_info(kmdp, - MODINFO_METADATA | MODINFOMD_SMAP); - smapsize =3D *((u_int32_t *)smapbase - 1); - smapend =3D (struct bios_smap *)((uintptr_t)smapbase + smapsize); + kmdp =3D preload_search_by_type(ELF_KERN_STR); + if (kmdp !=3D NULL) { + smapbase =3D (struct bios_smap *)preload_search_info(kmdp, + MODINFO_METADATA | MODINFOMD_SMAP); + smapsize =3D *((u_int32_t *)smapbase - 1); + smapend =3D (struct bios_smap *)((uintptr_t)smapbase + smap= size); - rid =3D 0; - for (smap =3D smapbase; smap < smapend; smap++) { - if (smap->type !=3D SMAP_TYPE_MEMORY || smap->length =3D=3D= 0) - continue; - error =3D bus_set_resource(dev, SYS_RES_MEMORY, rid, smap->= base, - smap->length); - if (error) - panic("ram_attach: resource %d failed set with %d",= rid, - error); - res =3D bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0= ); - if (res =3D=3D NULL) - panic("ram_attach: resource %d failed to attach", r= id); - rid++; + rid =3D 0; + for (smap =3D smapbase; smap < smapend; smap++) { + if (smap->type !=3D SMAP_TYPE_MEMORY || + smap->length =3D=3D 0) + continue; + error =3D bus_set_resource(dev, SYS_RES_MEMORY, rid= , + smap->base, smap->length); + if (error) + panic("ram_attach: resource %d failed set with %d", + rid, error); + res =3D bus_alloc_resource_any(dev, SYS_RES_MEMORY,= &rid, + 0); + if (res =3D=3D NULL) + panic("ram_attach: resource %d failed to attach", + rid); + rid++; + } + return (0); } - return (0); -} -#else -static int -ram_attach(device_t dev) -{ - struct resource *res; - vm_paddr_t *p; - int error, i, rid; /* * We use the dump_avail[] array rather than phys_avail[] for @@ -743,7 +738,6 @@ } return (0); } -#endif static device_method_t ram_methods[] =3D { /* Device interface */
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