Implement vm.pmap.kernel_maps for RISC-V
This is taken from the arm64 version, with the following simplifications: - Our current pmap implementation uses a 3-level paging scheme - The "mode" field has been omitted since RISC-V PTEs don't encode typical mode attributes Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D23594
This commit is contained in:
Mitchell Horne
parent
ccfb8acd70
commit
9ce0b407c2
@ -131,6 +131,7 @@ __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/sx.h>
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#include <sys/vmem.h>
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#include <sys/vmmeter.h>
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@ -4487,3 +4488,170 @@ pmap_get_tables(pmap_t pmap, vm_offset_t va, pd_entry_t **l1, pd_entry_t **l2,
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return (true);
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}
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/*
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* Track a range of the kernel's virtual address space that is contiguous
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* in various mapping attributes.
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*/
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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 l3pages;
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int l2pages;
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int l1pages;
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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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if (eva <= range->sva)
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return;
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sbuf_printf(sb, "0x%016lx-0x%016lx r%c%c%c%c %d %d %d\n",
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range->sva, eva,
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(range->attrs & PTE_W) == PTE_W ? 'w' : '-',
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(range->attrs & PTE_X) == PTE_X ? 'x' : '-',
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(range->attrs & PTE_U) == PTE_U ? 'u' : 's',
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(range->attrs & PTE_G) == PTE_G ? 'g' : '-',
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range->l1pages, range->l2pages, range->l3pages);
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/* Reset to sentinel value. */
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range->sva = 0xfffffffffffffffful;
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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.
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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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return (range->attrs == attrs);
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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 l1e, pd_entry_t l2e, pt_entry_t l3e)
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{
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pt_entry_t attrs;
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/* The PTE global bit is inherited by lower levels. */
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attrs = l1e & PTE_G;
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if ((l1e & PTE_RWX) != 0)
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attrs |= l1e & (PTE_RWX | PTE_U);
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else if (l2e != 0)
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attrs |= l2e & PTE_G;
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if ((l2e & PTE_RWX) != 0)
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attrs |= l2e & (PTE_RWX | PTE_U);
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else if (l3e != 0)
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attrs |= l3e & (PTE_RWX | PTE_U | PTE_G);
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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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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 l1e, *l2, l2e;
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pt_entry_t *l3, l3e;
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vm_offset_t sva;
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vm_paddr_t pa;
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int error, i, j, 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 = 0xfffffffffffffffful;
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/*
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* Iterate over the kernel page tables without holding the kernel pmap
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* lock. Kernel page table pages are never freed, so at worst we will
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* observe inconsistencies in the output.
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*/
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sva = VM_MIN_KERNEL_ADDRESS;
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for (i = pmap_l1_index(sva); i < Ln_ENTRIES; i++) {
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if (i == pmap_l1_index(DMAP_MIN_ADDRESS))
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sbuf_printf(sb, "\nDirect map:\n");
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else if (i == pmap_l1_index(VM_MIN_KERNEL_ADDRESS))
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sbuf_printf(sb, "\nKernel map:\n");
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l1e = kernel_pmap->pm_l1[i];
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if ((l1e & PTE_V) == 0) {
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sysctl_kmaps_dump(sb, &range, sva);
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sva += L1_SIZE;
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continue;
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}
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if ((l1e & PTE_RWX) != 0) {
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sysctl_kmaps_check(sb, &range, sva, l1e, 0, 0);
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range.l1pages++;
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sva += L1_SIZE;
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continue;
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}
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pa = PTE_TO_PHYS(l1e);
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l2 = (pd_entry_t *)PHYS_TO_DMAP(pa);
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for (j = pmap_l2_index(sva); j < Ln_ENTRIES; j++) {
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l2e = l2[j];
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if ((l2e & PTE_V) == 0) {
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sysctl_kmaps_dump(sb, &range, sva);
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sva += L2_SIZE;
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continue;
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}
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if ((l2e & PTE_RWX) != 0) {
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sysctl_kmaps_check(sb, &range, sva, l1e, l2e, 0);
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range.l2pages++;
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sva += L2_SIZE;
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continue;
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}
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pa = PTE_TO_PHYS(l2e);
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l3 = (pd_entry_t *)PHYS_TO_DMAP(pa);
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for (k = pmap_l3_index(sva); k < Ln_ENTRIES; k++,
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sva += L3_SIZE) {
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l3e = l3[k];
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if ((l3e & PTE_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,
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l1e, l2e, l3e);
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range.l3pages++;
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}
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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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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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