1 files changed, 413 insertions, 0 deletions

diff --git a/sys/amd64/vmm/vmm_mem.c b/sys/amd64/vmm/vmm_mem.c
new file mode 100644
index 000000000000..9ce1e800f323
--- /dev/null
+++ b/sys/amd64/vmm/vmm_mem.c
@@ -0,0 +1,413 @@
+/*-
+ * Copyright (c) 2011 NetApp, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/linker.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/md_var.h>
+#include <machine/metadata.h>
+#include <machine/pc/bios.h>
+#include <machine/vmparam.h>
+#include <machine/pmap.h>
+
+#include "vmm_util.h"
+#include "vmm_mem.h"
+
+static MALLOC_DEFINE(M_VMM_MEM, "vmm memory", "vmm memory");
+
+#define	MB		(1024 * 1024)
+#define	GB		(1024 * MB)
+
+#define	VMM_MEM_MAXSEGS	64
+
+/* protected by vmm_mem_mtx */
+static struct {
+	vm_paddr_t	base;
+	vm_size_t	length;
+} vmm_mem_avail[VMM_MEM_MAXSEGS];
+
+static int vmm_mem_nsegs;
+
+static vm_paddr_t maxaddr;
+
+static struct mtx vmm_mem_mtx;
+
+/*
+ * Steal any memory that was deliberately hidden from FreeBSD either by
+ * the use of MAXMEM kernel config option or the hw.physmem loader tunable.
+ */
+static int
+vmm_mem_steal_memory(void)
+{
+	int nsegs;
+	caddr_t kmdp;
+	uint32_t smapsize;
+	uint64_t base, length;
+	struct bios_smap *smapbase, *smap, *smapend;
+
+	/*
+	 * Borrowed from hammer_time() and getmemsize() in machdep.c
+	 */
+	kmdp = preload_search_by_type("elf kernel");
+	if (kmdp == NULL)
+		kmdp = preload_search_by_type("elf64 kernel");
+
+	smapbase = (struct bios_smap *)preload_search_info(kmdp,
+		MODINFO_METADATA | MODINFOMD_SMAP);
+	if (smapbase == NULL)
+		panic("No BIOS smap info from loader!");
+
+	smapsize = *((uint32_t *)smapbase - 1);
+	smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
+
+	nsegs = 0;
+	for (smap = smapbase; smap < smapend; smap++) {
+		/*
+		 * XXX
+		 * Assuming non-overlapping, monotonically increasing
+		 * memory segments.
+		 */
+		if (smap->type != SMAP_TYPE_MEMORY)
+			continue;
+		if (smap->length == 0)
+			break;
+
+		base = roundup(smap->base, NBPDR);
+		length = rounddown(smap->length, NBPDR);
+
+		/* Skip this segment if FreeBSD is using all of it. */
+		if (base + length <= ptoa(Maxmem))
+			continue;
+
+		/*
+		 * If FreeBSD is using part of this segment then adjust
+		 * 'base' and 'length' accordingly.
+		 */
+		if (base < ptoa(Maxmem)) {
+			uint64_t used;
+			used = roundup(ptoa(Maxmem), NBPDR) - base;
+			base += used;
+			length -= used;
+		}
+
+		if (length == 0)
+			continue;
+
+		vmm_mem_avail[nsegs].base = base;
+		vmm_mem_avail[nsegs].length = length;
+
+		if (base + length > maxaddr)
+			maxaddr = base + length;
+
+		if (0 && bootverbose) {
+			printf("vmm_mem_populate: index %d, base 0x%0lx, "
+			       "length %ld\n",
+			       nsegs, vmm_mem_avail[nsegs].base,
+			       vmm_mem_avail[nsegs].length);
+		}
+
+		nsegs++;
+		if (nsegs >= VMM_MEM_MAXSEGS) {
+			printf("vmm_mem_populate: maximum number of vmm memory "
+			       "segments reached!\n");
+			return (ENOSPC);
+		}
+	}
+
+	vmm_mem_nsegs = nsegs;
+
+	return (0);
+}
+
+static void
+vmm_mem_direct_map(vm_paddr_t start, vm_paddr_t end)
+{
+	vm_paddr_t addr, remaining;
+	int pdpi, pdi, superpage_size;
+	pml4_entry_t *pml4p;
+	pdp_entry_t *pdp;
+	pd_entry_t *pd;
+	uint64_t page_attr_bits;
+
+	if (end >= NBPML4)
+		panic("Cannot map memory beyond %ldGB", NBPML4 / GB);
+
+	/* XXX FreeBSD 8.1 does not use 1G superpages in the direct map */
+	if (0 && vmm_supports_1G_pages())
+		superpage_size = NBPDP;
+	else
+		superpage_size = NBPDR;
+
+	/*
+	 * Get the page directory pointer page that contains the direct
+	 * map address mappings.
+	 */
+	pml4p = kernel_pmap->pm_pml4;
+	pdp = (pdp_entry_t *)PHYS_TO_DMAP(pml4p[DMPML4I] & ~PAGE_MASK);
+
+	page_attr_bits = PG_RW | PG_V | PG_PS | PG_G;
+	addr = start;
+	while (addr < end) {
+		remaining = end - addr;
+		pdpi = addr / NBPDP;
+		if (superpage_size == NBPDP &&
+		    remaining >= NBPDP &&
+		    addr % NBPDP == 0) {
+			/*
+			 * If there isn't a mapping for this address then
+			 * create one but if there is one already make sure
+			 * it matches what we expect it to be.
+			 */
+			if (pdp[pdpi] == 0) {
+				pdp[pdpi] = addr | page_attr_bits;
+				if (0 && bootverbose) {
+					printf("vmm_mem_populate: mapping "
+					       "0x%lx with 1GB page at "
+					       "pdpi %d\n", addr, pdpi);
+				}
+			} else {
+				pdp_entry_t pdpe = pdp[pdpi];
+				if ((pdpe & ~PAGE_MASK) != addr ||
+				    (pdpe & page_attr_bits) != page_attr_bits) {
+					panic("An invalid mapping 0x%016lx "
+					      "already exists for 0x%016lx\n",
+					      pdpe, addr);
+				}
+			}
+			addr += NBPDP;
+		} else {
+			if (remaining < NBPDR) {
+				panic("vmm_mem_populate: remaining (%ld) must "
+				      "be greater than NBPDR (%d)\n",
+				      remaining, NBPDR);
+			}
+			if (pdp[pdpi] == 0) {
+				/*
+				 * XXX we lose this memory forever because
+				 * we do not keep track of the virtual address
+				 * that would be required to free this page.
+				 */
+				pd = malloc(PAGE_SIZE, M_VMM_MEM,
+					    M_WAITOK | M_ZERO);
+				if ((uintptr_t)pd & PAGE_MASK) {
+					panic("vmm_mem_populate: page directory"
+					      "page not aligned on %d "
+					      "boundary\n", PAGE_SIZE);
+				}
+				pdp[pdpi] = vtophys(pd);
+				pdp[pdpi] |= PG_RW | PG_V | PG_U;
+				if (0 && bootverbose) {
+					printf("Creating page directory "
+					       "at pdp index %d for 0x%016lx\n",
+					       pdpi, addr);
+				}
+			}
+			pdi = (addr % NBPDP) / NBPDR;
+			pd = (pd_entry_t *)PHYS_TO_DMAP(pdp[pdpi] & ~PAGE_MASK);
+
+			/*
+			 * Create a new mapping if one doesn't already exist
+			 * or validate it if it does.
+			 */
+			if (pd[pdi] == 0) {
+				pd[pdi] = addr | page_attr_bits;
+				if (0 && bootverbose) {
+					printf("vmm_mem_populate: mapping "
+					       "0x%lx with 2MB page at "
+					       "pdpi %d, pdi %d\n",
+					       addr, pdpi, pdi);
+				}
+			} else {
+				pd_entry_t pde = pd[pdi];
+				if ((pde & ~PAGE_MASK) != addr ||
+				    (pde & page_attr_bits) != page_attr_bits) {
+					panic("An invalid mapping 0x%016lx "
+					      "already exists for 0x%016lx\n",
+					      pde, addr);
+				}
+			}
+			addr += NBPDR;
+		}
+	}
+}
+
+static int
+vmm_mem_populate(void)
+{
+	int seg, error;
+	vm_paddr_t start, end;
+
+	/* populate the vmm_mem_avail[] array */
+	error = vmm_mem_steal_memory();
+	if (error)
+		return (error);
+	
+	/*
+	 * Now map the memory that was hidden from FreeBSD in
+	 * the direct map VA space.
+	 */
+	for (seg = 0; seg < vmm_mem_nsegs; seg++) {
+		start = vmm_mem_avail[seg].base;
+		end = start + vmm_mem_avail[seg].length;
+		if ((start & PDRMASK) != 0 || (end & PDRMASK) != 0) {
+			panic("start (0x%016lx) and end (0x%016lx) must be "
+			      "aligned on a %dMB boundary\n",
+			      start, end, NBPDR / MB);
+		}
+		vmm_mem_direct_map(start, end);
+	}
+
+	return (0);
+}
+
+int
+vmm_mem_init(void)
+{
+	int error;
+
+	mtx_init(&vmm_mem_mtx, "vmm_mem_mtx", NULL, MTX_DEF);
+
+	error = vmm_mem_populate();
+	if (error)
+		return (error);
+
+	return (0);
+}
+
+vm_paddr_t
+vmm_mem_alloc(size_t size)
+{
+	int i;
+	vm_paddr_t addr;
+
+	if ((size & PDRMASK) != 0) {
+		panic("vmm_mem_alloc: size 0x%0lx must be "
+		      "aligned on a 0x%0x boundary\n", size, NBPDR);
+	}
+
+	addr = 0;
+
+	mtx_lock(&vmm_mem_mtx);
+	for (i = 0; i < vmm_mem_nsegs; i++) {
+		if (vmm_mem_avail[i].length >= size) {
+			addr = vmm_mem_avail[i].base;
+			vmm_mem_avail[i].base += size;
+			vmm_mem_avail[i].length -= size;
+			/* remove a zero length segment */
+			if (vmm_mem_avail[i].length == 0) {
+				memmove(&vmm_mem_avail[i],
+					&vmm_mem_avail[i + 1],
+					(vmm_mem_nsegs - (i + 1)) *
+					 sizeof(vmm_mem_avail[0]));
+				vmm_mem_nsegs--;
+			}
+			break;
+		}
+	}
+	mtx_unlock(&vmm_mem_mtx);
+
+	return (addr);
+}
+
+void
+vmm_mem_free(vm_paddr_t base, size_t length)
+{
+	int i;
+
+	if ((base & PDRMASK) != 0 || (length & PDRMASK) != 0) {
+		panic("vmm_mem_free: base 0x%0lx and length 0x%0lx must be "
+		      "aligned on a 0x%0x boundary\n", base, length, NBPDR);
+	}
+
+	mtx_lock(&vmm_mem_mtx);
+
+	for (i = 0; i < vmm_mem_nsegs; i++) {
+		if (vmm_mem_avail[i].base > base)
+			break;
+	}
+
+	if (vmm_mem_nsegs >= VMM_MEM_MAXSEGS)
+		panic("vmm_mem_free: cannot free any more segments");
+
+	/* Create a new segment at index 'i' */
+	memmove(&vmm_mem_avail[i + 1], &vmm_mem_avail[i],
+		(vmm_mem_nsegs - i) * sizeof(vmm_mem_avail[0]));
+
+	vmm_mem_avail[i].base = base;
+	vmm_mem_avail[i].length = length;
+
+	vmm_mem_nsegs++;
+
+coalesce_some_more:
+	for (i = 0; i < vmm_mem_nsegs - 1; i++) {
+		if (vmm_mem_avail[i].base + vmm_mem_avail[i].length ==
+		    vmm_mem_avail[i + 1].base) {
+			vmm_mem_avail[i].length += vmm_mem_avail[i + 1].length;
+			memmove(&vmm_mem_avail[i + 1], &vmm_mem_avail[i + 2],
+			  (vmm_mem_nsegs - (i + 2)) * sizeof(vmm_mem_avail[0]));
+			vmm_mem_nsegs--;
+			goto coalesce_some_more;
+		}
+	}
+
+	mtx_unlock(&vmm_mem_mtx);
+}
+
+vm_paddr_t
+vmm_mem_maxaddr(void)
+{
+
+	return (maxaddr);
+}
+
+void
+vmm_mem_dump(void)
+{
+	int i;
+	vm_paddr_t base;
+	vm_size_t length;
+
+	mtx_lock(&vmm_mem_mtx);
+	for (i = 0; i < vmm_mem_nsegs; i++) {
+		base = vmm_mem_avail[i].base;
+		length = vmm_mem_avail[i].length;
+		printf("%-4d0x%016lx    0x%016lx\n", i, base, base + length);
+	}
+	mtx_unlock(&vmm_mem_mtx);
+}