i386: implement sysctl vm.pmap.kernel_maps.
Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D21739
This commit is contained in:
Konstantin Belousov
parent
a5181a86a2
commit
b223a69238
@ -121,6 +121,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/sbuf.h>
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#include <sys/sf_buf.h>
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#include <sys/sx.h>
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#include <sys/vmmeter.h>
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@ -1130,6 +1131,38 @@ __CONCAT(PMTYPE, cache_bits)(pmap_t pmap, int mode, boolean_t is_pde)
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return (cache_bits);
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}
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static int
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pmap_pat_index(pmap_t pmap, pt_entry_t pte, bool is_pde)
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{
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int pat_flag, pat_idx;
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if ((cpu_feature & CPUID_PAT) == 0)
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return (0);
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pat_idx = 0;
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/* The PAT bit is different for PTE's and PDE's. */
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pat_flag = is_pde ? PG_PDE_PAT : PG_PTE_PAT;
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if ((pte & pat_flag) != 0)
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pat_idx |= 0x4;
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if ((pte & PG_NC_PCD) != 0)
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pat_idx |= 0x2;
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if ((pte & PG_NC_PWT) != 0)
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pat_idx |= 0x1;
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/* See pmap_init_pat(). */
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if (pat_works) {
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if (pat_idx == 4)
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pat_idx = 0;
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if (pat_idx == 7)
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pat_idx = 3;
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} else {
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/* XXXKIB */
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}
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return (pat_idx);
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}
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static bool
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__CONCAT(PMTYPE, ps_enabled)(pmap_t pmap __unused)
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{
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@ -6083,7 +6116,213 @@ __CONCAT(PMTYPE, bios16_leave)(void *arg)
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free(h->pte, M_TEMP); /* ... and free it */
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}
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#define PMM(a) \
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struct pmap_kernel_map_range {
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vm_offset_t sva;
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pt_entry_t attrs;
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int ptes;
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int pdes;
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int pdpes;
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};
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static void
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sysctl_kmaps_dump(struct sbuf *sb, struct pmap_kernel_map_range *range,
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vm_offset_t eva)
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{
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const char *mode;
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int i, pat_idx;
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if (eva <= range->sva)
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return;
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pat_idx = pmap_pat_index(kernel_pmap, range->attrs, true);
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for (i = 0; i < PAT_INDEX_SIZE; i++)
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if (pat_index[i] == pat_idx)
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break;
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switch (i) {
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case PAT_WRITE_BACK:
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mode = "WB";
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break;
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case PAT_WRITE_THROUGH:
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mode = "WT";
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break;
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case PAT_UNCACHEABLE:
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mode = "UC";
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break;
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case PAT_UNCACHED:
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mode = "U-";
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break;
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case PAT_WRITE_PROTECTED:
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mode = "WP";
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break;
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case PAT_WRITE_COMBINING:
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mode = "WC";
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break;
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default:
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printf("%s: unknown PAT mode %#x for range 0x%08x-0x%08x\n",
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__func__, pat_idx, range->sva, eva);
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mode = "??";
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break;
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}
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sbuf_printf(sb, "0x%08x-0x%08x r%c%c%c%c %s %d %d %d\n",
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range->sva, eva,
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(range->attrs & PG_RW) != 0 ? 'w' : '-',
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#ifdef PMAP_PAE_COMP
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(range->attrs & pg_nx) != 0 ? '-' : 'x',
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#else
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'-',
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#endif
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(range->attrs & PG_U) != 0 ? 'u' : 's',
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(range->attrs & PG_G) != 0 ? 'g' : '-',
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mode, range->pdpes, range->pdes, range->ptes);
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/* Reset to sentinel value. */
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range->sva = 0xffffffff;
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}
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/*
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* Determine whether the attributes specified by a page table entry match those
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* being tracked by the current range. This is not quite as simple as a direct
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* flag comparison since some PAT modes have multiple representations.
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*/
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static bool
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sysctl_kmaps_match(struct pmap_kernel_map_range *range, pt_entry_t attrs)
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{
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pt_entry_t diff, mask;
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mask = PG_G | PG_RW | PG_U | PG_PDE_CACHE;
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#ifdef PMAP_PAE_COMP
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mask |= pg_nx;
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#endif
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diff = (range->attrs ^ attrs) & mask;
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if (diff == 0)
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return (true);
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if ((diff & ~PG_PDE_PAT) == 0 &&
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pmap_pat_index(kernel_pmap, range->attrs, true) ==
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pmap_pat_index(kernel_pmap, attrs, true))
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return (true);
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return (false);
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}
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static void
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sysctl_kmaps_reinit(struct pmap_kernel_map_range *range, vm_offset_t va,
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pt_entry_t attrs)
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{
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memset(range, 0, sizeof(*range));
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range->sva = va;
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range->attrs = attrs;
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}
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/*
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* Given a leaf PTE, derive the mapping's attributes. If they do not match
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* those of the current run, dump the address range and its attributes, and
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* begin a new run.
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*/
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static void
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sysctl_kmaps_check(struct sbuf *sb, struct pmap_kernel_map_range *range,
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vm_offset_t va, pd_entry_t pde, pt_entry_t pte)
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{
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pt_entry_t attrs, mask;
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attrs = pde & (PG_RW | PG_U);
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#ifdef PMAP_PAE_COMP
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attrs |= pde & pg_nx;
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#endif
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if ((pde & PG_PS) != 0) {
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attrs |= pde & (PG_G | PG_PDE_CACHE);
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} else if (pte != 0) {
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mask = pte & (PG_RW | PG_U);
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#ifdef PMAP_PAE_COMP
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mask |= pg_nx;
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#endif
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attrs &= mask;
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attrs |= pte & (PG_G | PG_PTE_CACHE);
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/* Canonicalize by always using the PDE PAT bit. */
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if ((attrs & PG_PTE_PAT) != 0)
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attrs ^= PG_PDE_PAT | PG_PTE_PAT;
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}
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if (range->sva > va || !sysctl_kmaps_match(range, attrs)) {
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sysctl_kmaps_dump(sb, range, va);
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sysctl_kmaps_reinit(range, va, attrs);
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}
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}
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static int
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__CONCAT(PMTYPE, sysctl_kmaps)(SYSCTL_HANDLER_ARGS)
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{
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struct pmap_kernel_map_range range;
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struct sbuf sbuf, *sb;
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pd_entry_t pde;
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pt_entry_t *pt, pte;
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vm_offset_t sva;
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vm_paddr_t pa;
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int error;
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u_int i, k;
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error = sysctl_wire_old_buffer(req, 0);
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if (error != 0)
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return (error);
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sb = &sbuf;
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sbuf_new_for_sysctl(sb, NULL, PAGE_SIZE, req);
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/* Sentinel value. */
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range.sva = 0xffffffff;
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/*
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* Iterate over the kernel page tables without holding the
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* kernel pmap lock. Kernel page table pages are never freed,
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* so at worst we will observe inconsistencies in the output.
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*/
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for (sva = 0, i = 0; i < NPTEPG * NPGPTD * NPDEPG ;) {
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if (i == 0)
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sbuf_printf(sb, "\nLow PDE:\n");
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else if (i == LOWPTDI * NPTEPG)
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sbuf_printf(sb, "Low PDE dup:\n");
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else if (i == PTDPTDI * NPTEPG)
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sbuf_printf(sb, "Recursive map:\n");
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else if (i == KERNPTDI * NPTEPG)
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sbuf_printf(sb, "Kernel base:\n");
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else if (i == TRPTDI * NPTEPG)
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sbuf_printf(sb, "Trampoline:\n");
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pde = IdlePTD[sva >> PDRSHIFT];
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if ((pde & PG_V) == 0) {
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sva = rounddown2(sva, NBPDR);
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sysctl_kmaps_dump(sb, &range, sva);
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sva += NBPDR;
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i += NPTEPG;
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continue;
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}
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pa = pde & PG_FRAME;
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if ((pde & PG_PS) != 0) {
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sysctl_kmaps_check(sb, &range, sva, pde, 0);
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range.pdes++;
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sva += NBPDR;
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i += NPTEPG;
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continue;
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}
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for (pt = vtopte(sva), k = 0; k < NPTEPG; i++, k++, pt++,
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sva += PAGE_SIZE) {
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pte = *pt;
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if ((pte & PG_V) == 0) {
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sysctl_kmaps_dump(sb, &range, sva);
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continue;
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}
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sysctl_kmaps_check(sb, &range, sva, pde, pte);
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range.ptes++;
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}
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}
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error = sbuf_finish(sb);
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sbuf_delete(sb);
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return (error);
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}
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#define PMM(a) \
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.pm_##a = __CONCAT(PMTYPE, a),
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struct pmap_methods __CONCAT(PMTYPE, methods) = {
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@ -6162,4 +6401,5 @@ struct pmap_methods __CONCAT(PMTYPE, methods) = {
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PMM(flush_page)
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PMM(kenter)
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PMM(kremove)
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PMM(sysctl_kmaps)
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};
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@ -258,6 +258,17 @@ SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_spare, CTLFLAG_RD,
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struct pmap kernel_pmap_store;
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static struct pmap_methods *pmap_methods_ptr;
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static int
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sysctl_kmaps(SYSCTL_HANDLER_ARGS)
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{
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return (pmap_methods_ptr->pm_sysctl_kmaps(oidp, arg1, arg2, req));
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}
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SYSCTL_OID(_vm_pmap, OID_AUTO, kernel_maps,
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CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
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NULL, 0, sysctl_kmaps, "A",
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"Dump kernel address layout");
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/*
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* Initialize a vm_page's machine-dependent fields.
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*/
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@ -118,6 +118,7 @@ struct pmap_methods {
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void (*pm_flush_page)(vm_page_t);
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void (*pm_kenter)(vm_offset_t, vm_paddr_t);
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void (*pm_kremove)(vm_offset_t);
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int (*pm_sysctl_kmaps)(SYSCTL_HANDLER_ARGS);
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};
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void pmap_cold(void);
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