hw/ppc/spapr_iommu.c - qemu - Git at Google

 /*
  * QEMU sPAPR IOMMU (TCE) code
  *
  * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "hw/hw.h"
 #include "sysemu/kvm.h"
 #include "hw/qdev.h"
 #include "kvm_ppc.h"
 #include "sysemu/dma.h"
 #include "exec/address-spaces.h"
 #include "trace.h"

 #include "hw/ppc/spapr.h"

 #include <libfdt.h>

 enum sPAPRTCEAccess {
     SPAPR_TCE_FAULT = 0,
     SPAPR_TCE_RO = 1,
     SPAPR_TCE_WO = 2,
     SPAPR_TCE_RW = 3,
 };

 QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;

 static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
 {
     sPAPRTCETable *tcet;

     if (liobn & 0xFFFFFFFF00000000ULL) {
         hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
                       liobn);
         return NULL;
     }

     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
         if (tcet->liobn == liobn) {
             return tcet;
         }
     }

     return NULL;
 }

 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr)
 {
     sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
     uint64_t tce;
     IOMMUTLBEntry ret = {
         .target_as = &address_space_memory,
         .iova = 0,
         .translated_addr = 0,
         .addr_mask = ~(hwaddr)0,
         .perm = IOMMU_NONE,
     };

     if (tcet->bypass) {
         ret.perm = IOMMU_RW;
     } else if (addr < tcet->window_size) {
         /* Check if we are in bound */
         tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT];
         ret.iova = addr & ~SPAPR_TCE_PAGE_MASK;
         ret.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
         ret.addr_mask = SPAPR_TCE_PAGE_MASK;
         ret.perm = tce;
     }
     trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
                             ret.addr_mask);

     return ret;
 }

 static int spapr_tce_table_pre_load(void *opaque)
 {
     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);

     tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;

     return 0;
 }

 static const VMStateDescription vmstate_spapr_tce_table = {
     .name = "spapr_iommu",
     .version_id = 1,
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .pre_load = spapr_tce_table_pre_load,
     .fields      = (VMStateField []) {
         /* Sanity check */
         VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
         VMSTATE_UINT32_EQUAL(window_size, sPAPRTCETable),

         /* IOMMU state */
         VMSTATE_BOOL(bypass, sPAPRTCETable),
         VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),

         VMSTATE_END_OF_LIST()
     },
 };

 static MemoryRegionIOMMUOps spapr_iommu_ops = {
     .translate = spapr_tce_translate_iommu,
 };

 static int spapr_tce_table_realize(DeviceState *dev)
 {
     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);

     if (kvm_enabled()) {
         tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
                                               tcet->window_size,
                                               &tcet->fd);
     }

     if (!tcet->table) {
         size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
             * sizeof(uint64_t);
         tcet->table = g_malloc0(table_size);
     }
     tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;

     trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);

     memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
                              "iommu-spapr", UINT64_MAX);

     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);

     return 0;
 }

 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn, size_t window_size)
 {
     sPAPRTCETable *tcet;

     if (spapr_tce_find_by_liobn(liobn)) {
         fprintf(stderr, "Attempted to create TCE table with duplicate"
                 " LIOBN 0x%x\n", liobn);
         return NULL;
     }

     if (!window_size) {
         return NULL;
     }

     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
     tcet->liobn = liobn;
     tcet->window_size = window_size;

     object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);

     qdev_init_nofail(DEVICE(tcet));

     return tcet;
 }

 static void spapr_tce_table_finalize(Object *obj)
 {
     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(obj);

     QLIST_REMOVE(tcet, list);

     if (!kvm_enabled() ||
         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
                                  tcet->window_size) != 0)) {
         g_free(tcet->table);
     }
 }

 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 {
     return &tcet->iommu;
 }

 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
 {
     tcet->bypass = bypass;
 }

 static void spapr_tce_reset(DeviceState *dev)
 {
     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
     size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
         * sizeof(uint64_t);

     tcet->bypass = false;
     memset(tcet->table, 0, table_size);
 }

 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
                                 target_ulong tce)
 {
     IOMMUTLBEntry entry;

     if (ioba >= tcet->window_size) {
         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
                       TARGET_FMT_lx "\n", ioba);
         return H_PARAMETER;
     }

     tcet->table[ioba >> SPAPR_TCE_PAGE_SHIFT] = tce;

     entry.target_as = &address_space_memory,
     entry.iova = ioba & ~SPAPR_TCE_PAGE_MASK;
     entry.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
     entry.addr_mask = SPAPR_TCE_PAGE_MASK;
     entry.perm = tce;
     memory_region_notify_iommu(&tcet->iommu, entry);

     return H_SUCCESS;
 }

 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                               target_ulong opcode, target_ulong *args)
 {
     target_ulong liobn = args[0];
     target_ulong ioba = args[1];
     target_ulong tce = args[2];
     target_ulong ret = H_PARAMETER;
     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);

     ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);

     if (tcet) {
         ret = put_tce_emu(tcet, ioba, tce);
     }
     trace_spapr_iommu_put(liobn, ioba, tce, ret);

     return ret;
 }

 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
                  uint32_t liobn, uint64_t window, uint32_t size)
 {
     uint32_t dma_prop[5];
     int ret;

     dma_prop[0] = cpu_to_be32(liobn);
     dma_prop[1] = cpu_to_be32(window >> 32);
     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
     dma_prop[3] = 0; /* window size is 32 bits */
     dma_prop[4] = cpu_to_be32(size);

     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
     if (ret < 0) {
         return ret;
     }

     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
     if (ret < 0) {
         return ret;
     }

     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
     if (ret < 0) {
         return ret;
     }

     return 0;
 }

 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
                       sPAPRTCETable *tcet)
 {
     if (!tcet) {
         return 0;
     }

     return spapr_dma_dt(fdt, node_off, propname,
                         tcet->liobn, 0, tcet->window_size);
 }

 static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     dc->vmsd = &vmstate_spapr_tce_table;
     dc->init = spapr_tce_table_realize;
     dc->reset = spapr_tce_reset;

     QLIST_INIT(&spapr_tce_tables);

     /* hcall-tce */
     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 }

 static TypeInfo spapr_tce_table_info = {
     .name = TYPE_SPAPR_TCE_TABLE,
     .parent = TYPE_DEVICE,
     .instance_size = sizeof(sPAPRTCETable),
     .class_init = spapr_tce_table_class_init,
     .instance_finalize = spapr_tce_table_finalize,
 };

 static void register_types(void)
 {
     type_register_static(&spapr_tce_table_info);
 }

 type_init(register_types);
	/*
	* QEMU sPAPR IOMMU (TCE) code
	*
	* Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*/
	#include "hw/hw.h"
	#include "sysemu/kvm.h"
	#include "hw/qdev.h"
	#include "kvm_ppc.h"
	#include "sysemu/dma.h"
	#include "exec/address-spaces.h"
	#include "trace.h"

	#include "hw/ppc/spapr.h"

	#include <libfdt.h>

	enum sPAPRTCEAccess {
	SPAPR_TCE_FAULT = 0,
	SPAPR_TCE_RO = 1,
	SPAPR_TCE_WO = 2,
	SPAPR_TCE_RW = 3,
	};

	QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;

	static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
	{
	sPAPRTCETable *tcet;

	if (liobn & 0xFFFFFFFF00000000ULL) {
	hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
	liobn);
	return NULL;
	}

	QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
	if (tcet->liobn == liobn) {
	return tcet;
	}
	}

	return NULL;
	}

	static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr)
	{
	sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
	uint64_t tce;
	IOMMUTLBEntry ret = {
	.target_as = &address_space_memory,
	.iova = 0,
	.translated_addr = 0,
	.addr_mask = ~(hwaddr)0,
	.perm = IOMMU_NONE,
	};

	if (tcet->bypass) {
	ret.perm = IOMMU_RW;
	} else if (addr < tcet->window_size) {
	/* Check if we are in bound */
	tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT];
	ret.iova = addr & ~SPAPR_TCE_PAGE_MASK;
	ret.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
	ret.addr_mask = SPAPR_TCE_PAGE_MASK;
	ret.perm = tce;
	}
	trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
	ret.addr_mask);

	return ret;
	}

	static int spapr_tce_table_pre_load(void *opaque)
	{
	sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);

	tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;

	return 0;
	}

	static const VMStateDescription vmstate_spapr_tce_table = {
	.name = "spapr_iommu",
	.version_id = 1,
	.minimum_version_id = 1,
	.minimum_version_id_old = 1,
	.pre_load = spapr_tce_table_pre_load,
	.fields = (VMStateField []) {
	/* Sanity check */
	VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
	VMSTATE_UINT32_EQUAL(window_size, sPAPRTCETable),

	/* IOMMU state */
	VMSTATE_BOOL(bypass, sPAPRTCETable),
	VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),

	VMSTATE_END_OF_LIST()
	},
	};

	static MemoryRegionIOMMUOps spapr_iommu_ops = {
	.translate = spapr_tce_translate_iommu,
	};

	static int spapr_tce_table_realize(DeviceState *dev)
	{
	sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);

	if (kvm_enabled()) {
	tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
	tcet->window_size,
	&tcet->fd);
	}

	if (!tcet->table) {
	size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
	* sizeof(uint64_t);
	tcet->table = g_malloc0(table_size);
	}
	tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;

	trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);

	memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
	"iommu-spapr", UINT64_MAX);

	QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);

	return 0;
	}

	sPAPRTCETable spapr_tce_new_table(DeviceState owner, uint32_t liobn, size_t window_size)
	{
	sPAPRTCETable *tcet;

	if (spapr_tce_find_by_liobn(liobn)) {
	fprintf(stderr, "Attempted to create TCE table with duplicate"
	" LIOBN 0x%x\n", liobn);
	return NULL;
	}

	if (!window_size) {
	return NULL;
	}

	tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
	tcet->liobn = liobn;
	tcet->window_size = window_size;

	object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);

	qdev_init_nofail(DEVICE(tcet));

	return tcet;
	}

	static void spapr_tce_table_finalize(Object *obj)
	{
	sPAPRTCETable *tcet = SPAPR_TCE_TABLE(obj);

	QLIST_REMOVE(tcet, list);

	if (!kvm_enabled() \|\|
	(kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
	tcet->window_size) != 0)) {
	g_free(tcet->table);
	}
	}

	MemoryRegion spapr_tce_get_iommu(sPAPRTCETable tcet)
	{
	return &tcet->iommu;
	}

	void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
	{
	tcet->bypass = bypass;
	}

	static void spapr_tce_reset(DeviceState *dev)
	{
	sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
	size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
	* sizeof(uint64_t);

	tcet->bypass = false;
	memset(tcet->table, 0, table_size);
	}

	static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
	target_ulong tce)
	{
	IOMMUTLBEntry entry;

	if (ioba >= tcet->window_size) {
	hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
	TARGET_FMT_lx "\n", ioba);
	return H_PARAMETER;
	}

	tcet->table[ioba >> SPAPR_TCE_PAGE_SHIFT] = tce;

	entry.target_as = &address_space_memory,
	entry.iova = ioba & ~SPAPR_TCE_PAGE_MASK;
	entry.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
	entry.addr_mask = SPAPR_TCE_PAGE_MASK;
	entry.perm = tce;
	memory_region_notify_iommu(&tcet->iommu, entry);

	return H_SUCCESS;
	}

	static target_ulong h_put_tce(PowerPCCPU cpu, sPAPREnvironment spapr,
	target_ulong opcode, target_ulong *args)
	{
	target_ulong liobn = args[0];
	target_ulong ioba = args[1];
	target_ulong tce = args[2];
	target_ulong ret = H_PARAMETER;
	sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);

	ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);

	if (tcet) {
	ret = put_tce_emu(tcet, ioba, tce);
	}
	trace_spapr_iommu_put(liobn, ioba, tce, ret);

	return ret;
	}

	int spapr_dma_dt(void fdt, int node_off, const char propname,
	uint32_t liobn, uint64_t window, uint32_t size)
	{
	uint32_t dma_prop[5];
	int ret;

	dma_prop[0] = cpu_to_be32(liobn);
	dma_prop[1] = cpu_to_be32(window >> 32);
	dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
	dma_prop[3] = 0; /* window size is 32 bits */
	dma_prop[4] = cpu_to_be32(size);

	ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
	if (ret < 0) {
	return ret;
	}

	ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
	if (ret < 0) {
	return ret;
	}

	ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
	if (ret < 0) {
	return ret;
	}

	return 0;
	}

	int spapr_tcet_dma_dt(void fdt, int node_off, const char propname,
	sPAPRTCETable *tcet)
	{
	if (!tcet) {
	return 0;
	}

	return spapr_dma_dt(fdt, node_off, propname,
	tcet->liobn, 0, tcet->window_size);
	}

	static void spapr_tce_table_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	dc->vmsd = &vmstate_spapr_tce_table;
	dc->init = spapr_tce_table_realize;
	dc->reset = spapr_tce_reset;

	QLIST_INIT(&spapr_tce_tables);

	/* hcall-tce */
	spapr_register_hypercall(H_PUT_TCE, h_put_tce);
	}

	static TypeInfo spapr_tce_table_info = {
	.name = TYPE_SPAPR_TCE_TABLE,
	.parent = TYPE_DEVICE,
	.instance_size = sizeof(sPAPRTCETable),
	.class_init = spapr_tce_table_class_init,
	.instance_finalize = spapr_tce_table_finalize,
	};

	static void register_types(void)
	{
	type_register_static(&spapr_tce_table_info);
	}

	type_init(register_types);