Differential D25574 Diff 74397 sys/x86/iommu/intel_idpgtbl.c

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sys/x86/iommu/intel_idpgtbl.c

Show First 20 Lines • Show All 64 Lines • ▼ Show 20 Lines
#include <machine/specialreg.h>		#include <machine/specialreg.h>
#include <x86/include/busdma_impl.h>		#include <x86/include/busdma_impl.h>
#include <x86/iommu/intel_reg.h>		#include <x86/iommu/intel_reg.h>
#include <x86/iommu/busdma_dmar.h>		#include <x86/iommu/busdma_dmar.h>
#include <dev/pci/pcireg.h>		#include <dev/pci/pcireg.h>
#include <x86/iommu/intel_dmar.h>		#include <x86/iommu/intel_dmar.h>

static int domain_unmap_buf_locked(struct dmar_domain *domain,		static int domain_unmap_buf_locked(struct dmar_domain *domain,
dmar_gaddr_t base, dmar_gaddr_t size, int flags);		iommu_gaddr_t base, iommu_gaddr_t size, int flags);

/*		/*
* The cache of the identity mapping page tables for the DMARs. Using		* The cache of the identity mapping page tables for the DMARs. Using
* the cache saves significant amount of memory for page tables by		* the cache saves significant amount of memory for page tables by
* reusing the page tables, since usually DMARs are identical and have		* reusing the page tables, since usually DMARs are identical and have
* the same capabilities. Still, cache records the information needed		* the same capabilities. Still, cache records the information needed
* to match DMAR capabilities and page table format, to correctly		* to match DMAR capabilities and page table format, to correctly
* handle different DMARs.		* handle different DMARs.
*/		*/

struct idpgtbl {		struct idpgtbl {
dmar_gaddr_t maxaddr; /* Page table covers the guest address		iommu_gaddr_t maxaddr; /* Page table covers the guest address
range [0..maxaddr) */		range [0..maxaddr) */
int pglvl; /* Total page table levels ignoring		int pglvl; /* Total page table levels ignoring
superpages */		superpages */
int leaf; /* The last materialized page table		int leaf; /* The last materialized page table
level, it is non-zero if superpages		level, it is non-zero if superpages
are supported */		are supported */
vm_object_t pgtbl_obj; /* The page table pages */		vm_object_t pgtbl_obj; /* The page table pages */
LIST_ENTRY(idpgtbl) link;		LIST_ENTRY(idpgtbl) link;
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* - lvl is the level to build;		* - lvl is the level to build;
* - idx is the index of the page table page in the pgtbl_obj, which is		* - idx is the index of the page table page in the pgtbl_obj, which is
* being allocated filled now;		* being allocated filled now;
* - addr is the starting address in the bus address space which is		* - addr is the starting address in the bus address space which is
* mapped by the page table page.		* mapped by the page table page.
*/		*/
static void		static void
domain_idmap_nextlvl(struct idpgtbl *tbl, int lvl, vm_pindex_t idx,		domain_idmap_nextlvl(struct idpgtbl *tbl, int lvl, vm_pindex_t idx,
dmar_gaddr_t addr)		iommu_gaddr_t addr)
{		{
vm_page_t m1;		vm_page_t m1;
dmar_pte_t *pte;		dmar_pte_t *pte;
struct sf_buf *sf;		struct sf_buf *sf;
dmar_gaddr_t f, pg_sz;		iommu_gaddr_t f, pg_sz;
vm_pindex_t base;		vm_pindex_t base;
int i;		int i;

VM_OBJECT_ASSERT_LOCKED(tbl->pgtbl_obj);		VM_OBJECT_ASSERT_LOCKED(tbl->pgtbl_obj);
if (addr >= tbl->maxaddr)		if (addr >= tbl->maxaddr)
return;		return;
(void)dmar_pgalloc(tbl->pgtbl_obj, idx, DMAR_PGF_OBJL \| DMAR_PGF_WAITOK \|		(void)dmar_pgalloc(tbl->pgtbl_obj, idx, DMAR_PGF_OBJL \| DMAR_PGF_WAITOK \|
DMAR_PGF_ZERO);		DMAR_PGF_ZERO);
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* Find a ready and compatible identity-mapping page table in the		* Find a ready and compatible identity-mapping page table in the
* cache. If not found, populate the identity-mapping page table for		* cache. If not found, populate the identity-mapping page table for
* the context, up to the maxaddr. The maxaddr byte is allowed to be		* the context, up to the maxaddr. The maxaddr byte is allowed to be
* not mapped, which is aligned with the definition of Maxmem as the		* not mapped, which is aligned with the definition of Maxmem as the
* highest usable physical address + 1. If superpages are used, the		* highest usable physical address + 1. If superpages are used, the
* maxaddr is typically mapped.		* maxaddr is typically mapped.
*/		*/
vm_object_t		vm_object_t
domain_get_idmap_pgtbl(struct dmar_domain *domain, dmar_gaddr_t maxaddr)		domain_get_idmap_pgtbl(struct dmar_domain *domain, iommu_gaddr_t maxaddr)
{		{
struct dmar_unit *unit;		struct dmar_unit *unit;
struct idpgtbl *tbl;		struct idpgtbl *tbl;
vm_object_t res;		vm_object_t res;
vm_page_t m;		vm_page_t m;
int leaf, i;		int leaf, i;

leaf = 0; /* silence gcc */		leaf = 0; /* silence gcc */
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* address. Support superpages.		* address. Support superpages.
*/		*/

/*		/*
* Index of the pte for the guest address base in the page table at		* Index of the pte for the guest address base in the page table at
* the level lvl.		* the level lvl.
*/		*/
static int		static int
domain_pgtbl_pte_off(struct dmar_domain *domain, dmar_gaddr_t base, int lvl)		domain_pgtbl_pte_off(struct dmar_domain *domain, iommu_gaddr_t base, int lvl)
{		{

base >>= DMAR_PAGE_SHIFT + (domain->pglvl - lvl - 1) *		base >>= DMAR_PAGE_SHIFT + (domain->pglvl - lvl - 1) *
DMAR_NPTEPGSHIFT;		DMAR_NPTEPGSHIFT;
return (base & DMAR_PTEMASK);		return (base & DMAR_PTEMASK);
}		}

/*		/*
* Returns the page index of the page table page in the page table		* Returns the page index of the page table page in the page table
* object, which maps the given address base at the page table level		* object, which maps the given address base at the page table level
* lvl.		* lvl.
*/		*/
static vm_pindex_t		static vm_pindex_t
domain_pgtbl_get_pindex(struct dmar_domain *domain, dmar_gaddr_t base, int lvl)		domain_pgtbl_get_pindex(struct dmar_domain *domain, iommu_gaddr_t base, int lvl)
{		{
vm_pindex_t idx, pidx;		vm_pindex_t idx, pidx;
int i;		int i;

KASSERT(lvl >= 0 && lvl < domain->pglvl,		KASSERT(lvl >= 0 && lvl < domain->pglvl,
("wrong lvl %p %d", domain, lvl));		("wrong lvl %p %d", domain, lvl));

for (pidx = idx = 0, i = 0; i < lvl; i++, pidx = idx) {		for (pidx = idx = 0, i = 0; i < lvl; i++, pidx = idx) {
idx = domain_pgtbl_pte_off(domain, base, i) +		idx = domain_pgtbl_pte_off(domain, base, i) +
pidx * DMAR_NPTEPG + 1;		pidx * DMAR_NPTEPG + 1;
}		}
return (idx);		return (idx);
}		}

static dmar_pte_t *		static dmar_pte_t *
domain_pgtbl_map_pte(struct dmar_domain *domain, dmar_gaddr_t base, int lvl,		domain_pgtbl_map_pte(struct dmar_domain *domain, iommu_gaddr_t base, int lvl,
int flags, vm_pindex_t idxp, struct sf_buf *sf)		int flags, vm_pindex_t idxp, struct sf_buf *sf)
{		{
vm_page_t m;		vm_page_t m;
struct sf_buf *sfp;		struct sf_buf *sfp;
dmar_pte_t pte, ptep;		dmar_pte_t pte, ptep;
vm_pindex_t idx, idx1;		vm_pindex_t idx, idx1;

DMAR_DOMAIN_ASSERT_PGLOCKED(domain);		DMAR_DOMAIN_ASSERT_PGLOCKED(domain);
▲ Show 20 Lines • Show All 51 Lines • ▼ Show 20 Lines	if (pte == NULL) {
goto retry;		goto retry;
}		}
}		}
pte += domain_pgtbl_pte_off(domain, base, lvl);		pte += domain_pgtbl_pte_off(domain, base, lvl);
return (pte);		return (pte);
}		}

static int		static int
domain_map_buf_locked(struct dmar_domain *domain, dmar_gaddr_t base,		domain_map_buf_locked(struct dmar_domain *domain, iommu_gaddr_t base,
dmar_gaddr_t size, vm_page_t *ma, uint64_t pflags, int flags)		iommu_gaddr_t size, vm_page_t *ma, uint64_t pflags, int flags)
{		{
dmar_pte_t *pte;		dmar_pte_t *pte;
struct sf_buf *sf;		struct sf_buf *sf;
dmar_gaddr_t pg_sz, base1, size1;		iommu_gaddr_t pg_sz, base1, size1;
vm_pindex_t pi, c, idx, run_sz;		vm_pindex_t pi, c, idx, run_sz;
int lvl;		int lvl;
bool superpage;		bool superpage;

DMAR_DOMAIN_ASSERT_PGLOCKED(domain);		DMAR_DOMAIN_ASSERT_PGLOCKED(domain);

base1 = base;		base1 = base;
size1 = size;		size1 = size;
▲ Show 20 Lines • Show All 56 Lines • ▼ Show 20 Lines	domain_map_buf_locked(struct dmar_domain *domain, iommu_gaddr_t base,
}		}
if (sf != NULL)		if (sf != NULL)
dmar_unmap_pgtbl(sf);		dmar_unmap_pgtbl(sf);
TD_PINNED_ASSERT;		TD_PINNED_ASSERT;
return (0);		return (0);
}		}

int		int
domain_map_buf(struct dmar_domain *domain, dmar_gaddr_t base, dmar_gaddr_t size,		domain_map_buf(struct dmar_domain *domain, iommu_gaddr_t base, iommu_gaddr_t size,
vm_page_t *ma, uint64_t pflags, int flags)		vm_page_t *ma, uint64_t pflags, int flags)
{		{
struct dmar_unit *unit;		struct dmar_unit *unit;
int error;		int error;

unit = domain->dmar;		unit = domain->dmar;

KASSERT((domain->flags & DMAR_DOMAIN_IDMAP) == 0,		KASSERT((domain->flags & DMAR_DOMAIN_IDMAP) == 0,
▲ Show 20 Lines • Show All 43 Lines • ▼ Show 20 Lines	else if ((unit->hw_cap & DMAR_CAP_RWBF) != 0) {
DMAR_LOCK(unit);		DMAR_LOCK(unit);
dmar_flush_write_bufs(unit);		dmar_flush_write_bufs(unit);
DMAR_UNLOCK(unit);		DMAR_UNLOCK(unit);
}		}
return (0);		return (0);
}		}

static void domain_unmap_clear_pte(struct dmar_domain *domain,		static void domain_unmap_clear_pte(struct dmar_domain *domain,
dmar_gaddr_t base, int lvl, int flags, dmar_pte_t *pte,		iommu_gaddr_t base, int lvl, int flags, dmar_pte_t *pte,
struct sf_buf **sf, bool free_fs);		struct sf_buf **sf, bool free_fs);

static void		static void
domain_free_pgtbl_pde(struct dmar_domain *domain, dmar_gaddr_t base,		domain_free_pgtbl_pde(struct dmar_domain *domain, iommu_gaddr_t base,
int lvl, int flags)		int lvl, int flags)
{		{
struct sf_buf *sf;		struct sf_buf *sf;
dmar_pte_t *pde;		dmar_pte_t *pde;
vm_pindex_t idx;		vm_pindex_t idx;

sf = NULL;		sf = NULL;
pde = domain_pgtbl_map_pte(domain, base, lvl, flags, &idx, &sf);		pde = domain_pgtbl_map_pte(domain, base, lvl, flags, &idx, &sf);
domain_unmap_clear_pte(domain, base, lvl, flags, pde, &sf, true);		domain_unmap_clear_pte(domain, base, lvl, flags, pde, &sf, true);
}		}

static void		static void
domain_unmap_clear_pte(struct dmar_domain *domain, dmar_gaddr_t base, int lvl,		domain_unmap_clear_pte(struct dmar_domain *domain, iommu_gaddr_t base, int lvl,
int flags, dmar_pte_t pte, struct sf_buf *sf, bool free_sf)		int flags, dmar_pte_t pte, struct sf_buf *sf, bool free_sf)
{		{
vm_page_t m;		vm_page_t m;

dmar_pte_clear(&pte->pte);		dmar_pte_clear(&pte->pte);
dmar_flush_pte_to_ram(domain->dmar, pte);		dmar_flush_pte_to_ram(domain->dmar, pte);
m = sf_buf_page(*sf);		m = sf_buf_page(*sf);
if (free_sf) {		if (free_sf) {
Show All 12 Lines	domain_unmap_clear_pte(struct dmar_domain *domain, iommu_gaddr_t base, int lvl,
dmar_pgfree(domain->pgtbl_obj, m->pindex, flags);		dmar_pgfree(domain->pgtbl_obj, m->pindex, flags);
domain_free_pgtbl_pde(domain, base, lvl - 1, flags);		domain_free_pgtbl_pde(domain, base, lvl - 1, flags);
}		}

/*		/*
* Assumes that the unmap is never partial.		* Assumes that the unmap is never partial.
*/		*/
static int		static int
domain_unmap_buf_locked(struct dmar_domain *domain, dmar_gaddr_t base,		domain_unmap_buf_locked(struct dmar_domain *domain, iommu_gaddr_t base,
dmar_gaddr_t size, int flags)		iommu_gaddr_t size, int flags)
{		{
dmar_pte_t *pte;		dmar_pte_t *pte;
struct sf_buf *sf;		struct sf_buf *sf;
vm_pindex_t idx;		vm_pindex_t idx;
dmar_gaddr_t pg_sz;		iommu_gaddr_t pg_sz;
int lvl;		int lvl;

DMAR_DOMAIN_ASSERT_PGLOCKED(domain);		DMAR_DOMAIN_ASSERT_PGLOCKED(domain);
if (size == 0)		if (size == 0)
return (0);		return (0);

KASSERT((domain->flags & DMAR_DOMAIN_IDMAP) == 0,		KASSERT((domain->flags & DMAR_DOMAIN_IDMAP) == 0,
("modifying idmap pagetable domain %p", domain));		("modifying idmap pagetable domain %p", domain));
▲ Show 20 Lines • Show All 49 Lines • ▼ Show 20 Lines	domain_unmap_buf_locked(struct dmar_domain *domain, iommu_gaddr_t base,
* can be ignored there.		* can be ignored there.
*/		*/

TD_PINNED_ASSERT;		TD_PINNED_ASSERT;
return (0);		return (0);
}		}

int		int
domain_unmap_buf(struct dmar_domain *domain, dmar_gaddr_t base,		domain_unmap_buf(struct dmar_domain *domain, iommu_gaddr_t base,
dmar_gaddr_t size, int flags)		iommu_gaddr_t size, int flags)
{		{
int error;		int error;

DMAR_DOMAIN_PGLOCK(domain);		DMAR_DOMAIN_PGLOCK(domain);
error = domain_unmap_buf_locked(domain, base, size, flags);		error = domain_unmap_buf_locked(domain, base, size, flags);
DMAR_DOMAIN_PGUNLOCK(domain);		DMAR_DOMAIN_PGUNLOCK(domain);
return (error);		return (error);
}		}
▲ Show 20 Lines • Show All 62 Lines • ▼ Show 20 Lines	for (;;) {
if ((iotlbr & DMAR_IOTLB_IVT) == 0)		if ((iotlbr & DMAR_IOTLB_IVT) == 0)
break;		break;
cpu_spinwait();		cpu_spinwait();
}		}
return (iotlbr);		return (iotlbr);
}		}

void		void
domain_flush_iotlb_sync(struct dmar_domain *domain, dmar_gaddr_t base,		domain_flush_iotlb_sync(struct dmar_domain *domain, iommu_gaddr_t base,
dmar_gaddr_t size)		iommu_gaddr_t size)
{		{
struct dmar_unit *unit;		struct dmar_unit *unit;
dmar_gaddr_t isize;		iommu_gaddr_t isize;
uint64_t iotlbr;		uint64_t iotlbr;
int am, iro;		int am, iro;

unit = domain->dmar;		unit = domain->dmar;
KASSERT(!unit->qi_enabled, ("dmar%d: sync iotlb flush call",		KASSERT(!unit->qi_enabled, ("dmar%d: sync iotlb flush call",
unit->unit));		unit->iommu.unit));
iro = DMAR_ECAP_IRO(unit->hw_ecap) * 16;		iro = DMAR_ECAP_IRO(unit->hw_ecap) * 16;
DMAR_LOCK(unit);		DMAR_LOCK(unit);
if ((unit->hw_cap & DMAR_CAP_PSI) == 0 \|\| size > 2 * 1024 * 1024) {		if ((unit->hw_cap & DMAR_CAP_PSI) == 0 \|\| size > 2 * 1024 * 1024) {
iotlbr = domain_wait_iotlb_flush(unit, DMAR_IOTLB_IIRG_DOM \|		iotlbr = domain_wait_iotlb_flush(unit, DMAR_IOTLB_IIRG_DOM \|
DMAR_IOTLB_DID(domain->domain), iro);		DMAR_IOTLB_DID(domain->domain), iro);
KASSERT((iotlbr & DMAR_IOTLB_IAIG_MASK) !=		KASSERT((iotlbr & DMAR_IOTLB_IAIG_MASK) !=
DMAR_IOTLB_IAIG_INVLD,		DMAR_IOTLB_IAIG_INVLD,
("dmar%d: invalidation failed %jx", unit->unit,		("dmar%d: invalidation failed %jx", unit->iommu.unit,
(uintmax_t)iotlbr));		(uintmax_t)iotlbr));
} else {		} else {
for (; size > 0; base += isize, size -= isize) {		for (; size > 0; base += isize, size -= isize) {
am = calc_am(unit, base, size, &isize);		am = calc_am(unit, base, size, &isize);
dmar_write8(unit, iro, base \| am);		dmar_write8(unit, iro, base \| am);
iotlbr = domain_wait_iotlb_flush(unit,		iotlbr = domain_wait_iotlb_flush(unit,
DMAR_IOTLB_IIRG_PAGE \|		DMAR_IOTLB_IIRG_PAGE \|
DMAR_IOTLB_DID(domain->domain), iro);		DMAR_IOTLB_DID(domain->domain), iro);
KASSERT((iotlbr & DMAR_IOTLB_IAIG_MASK) !=		KASSERT((iotlbr & DMAR_IOTLB_IAIG_MASK) !=
DMAR_IOTLB_IAIG_INVLD,		DMAR_IOTLB_IAIG_INVLD,
("dmar%d: PSI invalidation failed "		("dmar%d: PSI invalidation failed "
"iotlbr 0x%jx base 0x%jx size 0x%jx am %d",		"iotlbr 0x%jx base 0x%jx size 0x%jx am %d",
unit->unit, (uintmax_t)iotlbr,		unit->iommu.unit, (uintmax_t)iotlbr,
(uintmax_t)base, (uintmax_t)size, am));		(uintmax_t)base, (uintmax_t)size, am));
/*		/*
* Any non-page granularity covers whole guest		* Any non-page granularity covers whole guest
* address space for the domain.		* address space for the domain.
*/		*/
if ((iotlbr & DMAR_IOTLB_IAIG_MASK) !=		if ((iotlbr & DMAR_IOTLB_IAIG_MASK) !=
DMAR_IOTLB_IAIG_PAGE)		DMAR_IOTLB_IAIG_PAGE)
break;		break;
}		}
}		}
DMAR_UNLOCK(unit);		DMAR_UNLOCK(unit);
}		}