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

 /*
  * QEMU PowerNV, BMC related functions
  *
  * Copyright (c) 2016-2017, IBM Corporation.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2, as
  * published by the Free Software Foundation.
  *
  * This program 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 General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "target/ppc/cpu.h"
 #include "qemu/log.h"
 #include "hw/ipmi/ipmi.h"
 #include "hw/ppc/fdt.h"

 #include "hw/ppc/pnv.h"

 #include <libfdt.h>

 /* TODO: include definition in ipmi.h */
 #define IPMI_SDR_FULL_TYPE 1

 /*
  * OEM SEL Event data packet sent by BMC in response of a Read Event
  * Message Buffer command
  */
 typedef struct OemSel {
     /* SEL header */
     uint8_t id[2];
     uint8_t type;
     uint8_t timestamp[4];
     uint8_t manuf_id[3];

     /* OEM SEL data (6 bytes) follows */
     uint8_t netfun;
     uint8_t cmd;
     uint8_t data[4];
 } OemSel;

 #define SOFT_OFF        0x00
 #define SOFT_REBOOT     0x01

 static bool pnv_bmc_is_simulator(IPMIBmc *bmc)
 {
     return object_dynamic_cast(OBJECT(bmc), TYPE_IPMI_BMC_SIMULATOR);
 }

 static void pnv_gen_oem_sel(IPMIBmc *bmc, uint8_t reboot)
 {
     /* IPMI SEL Event are 16 bytes long */
     OemSel sel = {
         .id        = { 0x55 , 0x55 },
         .type      = 0xC0, /* OEM */
         .manuf_id  = { 0x0, 0x0, 0x0 },
         .timestamp = { 0x0, 0x0, 0x0, 0x0 },
         .netfun    = 0x3A, /* IBM */
         .cmd       = 0x04, /* AMI OEM SEL Power Notification */
         .data      = { reboot, 0xFF, 0xFF, 0xFF },
     };

     ipmi_bmc_gen_event(bmc, (uint8_t *) &sel, 0 /* do not log the event */);
 }

 void pnv_bmc_powerdown(IPMIBmc *bmc)
 {
     pnv_gen_oem_sel(bmc, SOFT_OFF);
 }

 void pnv_dt_bmc_sensors(IPMIBmc *bmc, void *fdt)
 {
     int offset;
     int i;
     const struct ipmi_sdr_compact *sdr;
     uint16_t nextrec;

     if (!pnv_bmc_is_simulator(bmc)) {
         return;
     }

     offset = fdt_add_subnode(fdt, 0, "bmc");
     _FDT(offset);

     _FDT((fdt_setprop_string(fdt, offset, "name", "bmc")));
     offset = fdt_add_subnode(fdt, offset, "sensors");
     _FDT(offset);

     _FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0x1)));
     _FDT((fdt_setprop_cell(fdt, offset, "#size-cells", 0x0)));

     for (i = 0; !ipmi_bmc_sdr_find(bmc, i, &sdr, &nextrec); i++) {
         int off;
         char *name;

         if (sdr->header.rec_type != IPMI_SDR_COMPACT_TYPE &&
             sdr->header.rec_type != IPMI_SDR_FULL_TYPE) {
             continue;
         }

         name = g_strdup_printf("sensor@%x", sdr->sensor_owner_number);
         off = fdt_add_subnode(fdt, offset, name);
         _FDT(off);
         g_free(name);

         _FDT((fdt_setprop_cell(fdt, off, "reg", sdr->sensor_owner_number)));
         _FDT((fdt_setprop_string(fdt, off, "name", "sensor")));
         _FDT((fdt_setprop_string(fdt, off, "compatible", "ibm,ipmi-sensor")));
         _FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-reading-type",
                                sdr->reading_type)));
         _FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-id",
                                sdr->entity_id)));
         _FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-instance",
                                sdr->entity_instance)));
         _FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-type",
                                sdr->sensor_type)));
     }
 }

 /*
  * HIOMAP protocol handler
  */
 #define HIOMAP_C_RESET                  1
 #define HIOMAP_C_GET_INFO               2
 #define HIOMAP_C_GET_FLASH_INFO         3
 #define HIOMAP_C_CREATE_READ_WINDOW     4
 #define HIOMAP_C_CLOSE_WINDOW           5
 #define HIOMAP_C_CREATE_WRITE_WINDOW    6
 #define HIOMAP_C_MARK_DIRTY             7
 #define HIOMAP_C_FLUSH                  8
 #define HIOMAP_C_ACK                    9
 #define HIOMAP_C_ERASE                  10
 #define HIOMAP_C_DEVICE_NAME            11
 #define HIOMAP_C_LOCK                   12

 #define BLOCK_SHIFT                     12 /* 4K */

 static uint16_t bytes_to_blocks(uint32_t bytes)
 {
     return bytes >> BLOCK_SHIFT;
 }

 static uint32_t blocks_to_bytes(uint16_t blocks)
 {
     return blocks << BLOCK_SHIFT;
 }

 static int hiomap_erase(PnvPnor *pnor, uint32_t offset, uint32_t size)
 {
     MemTxResult result;
     int i;

     for (i = 0; i < size / 4; i++) {
         result = memory_region_dispatch_write(&pnor->mmio, offset + i * 4,
                                               0xFFFFFFFF, MO_32,
                                               MEMTXATTRS_UNSPECIFIED);
         if (result != MEMTX_OK) {
             return -1;
         }
     }
     return 0;
 }

 static void hiomap_cmd(IPMIBmcSim *ibs, uint8_t *cmd, unsigned int cmd_len,
                        RspBuffer *rsp)
 {
     PnvPnor *pnor = PNV_PNOR(object_property_get_link(OBJECT(ibs), "pnor",
                                                       &error_abort));
     uint32_t pnor_size = pnor->size;
     uint32_t pnor_addr = PNOR_SPI_OFFSET;
     bool readonly = false;

     rsp_buffer_push(rsp, cmd[2]);
     rsp_buffer_push(rsp, cmd[3]);

     switch (cmd[2]) {
     case HIOMAP_C_MARK_DIRTY:
     case HIOMAP_C_FLUSH:
     case HIOMAP_C_ACK:
         break;

     case HIOMAP_C_ERASE:
         if (hiomap_erase(pnor, blocks_to_bytes(cmd[5] << 8 | cmd[4]),
                         blocks_to_bytes(cmd[7] << 8 | cmd[6]))) {
             rsp_buffer_set_error(rsp, IPMI_CC_UNSPECIFIED);
         }
         break;

     case HIOMAP_C_GET_INFO:
         rsp_buffer_push(rsp, 2);  /* Version 2 */
         rsp_buffer_push(rsp, BLOCK_SHIFT); /* block size */
         rsp_buffer_push(rsp, 0);  /* Timeout */
         rsp_buffer_push(rsp, 0);  /* Timeout */
         break;

     case HIOMAP_C_GET_FLASH_INFO:
         rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
         rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
         rsp_buffer_push(rsp, 0x01);  /* erase size */
         rsp_buffer_push(rsp, 0x00);  /* erase size */
         break;

     case HIOMAP_C_CREATE_READ_WINDOW:
         readonly = true;
         /* Fall through */

     case HIOMAP_C_CREATE_WRITE_WINDOW:
         memory_region_set_readonly(&pnor->mmio, readonly);
         memory_region_set_enabled(&pnor->mmio, true);

         rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) & 0xFF);
         rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) >> 8);
         rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
         rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
         rsp_buffer_push(rsp, 0x00); /* offset */
         rsp_buffer_push(rsp, 0x00); /* offset */
         break;

     case HIOMAP_C_CLOSE_WINDOW:
         memory_region_set_enabled(&pnor->mmio, false);
         break;

     case HIOMAP_C_DEVICE_NAME:
     case HIOMAP_C_RESET:
     case HIOMAP_C_LOCK:
     default:
         qemu_log_mask(LOG_GUEST_ERROR, "HIOMAP: unknown command %02X\n", cmd[2]);
         break;
     }
 }

 #define HIOMAP   0x5a

 static const IPMICmdHandler hiomap_cmds[] = {
     [HIOMAP] = { hiomap_cmd, 3 },
 };

 static const IPMINetfn hiomap_netfn = {
     .cmd_nums = ARRAY_SIZE(hiomap_cmds),
     .cmd_handlers = hiomap_cmds
 };


 void pnv_bmc_set_pnor(IPMIBmc *bmc, PnvPnor *pnor)
 {
     if (!pnv_bmc_is_simulator(bmc)) {
         return;
     }

     object_ref(OBJECT(pnor));
     object_property_add_const_link(OBJECT(bmc), "pnor", OBJECT(pnor));

     /* Install the HIOMAP protocol handlers to access the PNOR */
     ipmi_sim_register_netfn(IPMI_BMC_SIMULATOR(bmc), IPMI_NETFN_OEM,
                             &hiomap_netfn);
 }

 /*
  * Instantiate the machine BMC. PowerNV uses the QEMU internal
  * simulator but it could also be external.
  */
 IPMIBmc *pnv_bmc_create(PnvPnor *pnor)
 {
     DeviceState *dev;

     dev = qdev_new(TYPE_IPMI_BMC_SIMULATOR);
     qdev_realize(dev, NULL, &error_fatal);
     pnv_bmc_set_pnor(IPMI_BMC(dev), pnor);

     return IPMI_BMC(dev);
 }

 typedef struct ForeachArgs {
     const char *name;
     Object *obj;
 } ForeachArgs;

 static int bmc_find(Object *child, void *opaque)
 {
     ForeachArgs *args = opaque;

     if (object_dynamic_cast(child, args->name)) {
         if (args->obj) {
             return 1;
         }
         args->obj = child;
     }
     return 0;
 }

 IPMIBmc *pnv_bmc_find(Error **errp)
 {
     ForeachArgs args = { TYPE_IPMI_BMC, NULL };
     int ret;

     ret = object_child_foreach_recursive(object_get_root(), bmc_find, &args);
     if (ret) {
         error_setg(errp, "machine should have only one BMC device. "
                    "Use '-nodefaults'");
         return NULL;
     }

     return args.obj ? IPMI_BMC(args.obj) : NULL;
 }
	/*
	* QEMU PowerNV, BMC related functions
	*
	* Copyright (c) 2016-2017, IBM Corporation.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2, as
	* published by the Free Software Foundation.
	*
	* This program 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 General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "qemu/osdep.h"
	#include "qapi/error.h"
	#include "target/ppc/cpu.h"
	#include "qemu/log.h"
	#include "hw/ipmi/ipmi.h"
	#include "hw/ppc/fdt.h"

	#include "hw/ppc/pnv.h"

	#include <libfdt.h>

	/* TODO: include definition in ipmi.h */
	#define IPMI_SDR_FULL_TYPE 1

	/*
	* OEM SEL Event data packet sent by BMC in response of a Read Event
	* Message Buffer command
	*/
	typedef struct OemSel {
	/* SEL header */
	uint8_t id[2];
	uint8_t type;
	uint8_t timestamp[4];
	uint8_t manuf_id[3];

	/* OEM SEL data (6 bytes) follows */
	uint8_t netfun;
	uint8_t cmd;
	uint8_t data[4];
	} OemSel;

	#define SOFT_OFF 0x00
	#define SOFT_REBOOT 0x01

	static bool pnv_bmc_is_simulator(IPMIBmc *bmc)
	{
	return object_dynamic_cast(OBJECT(bmc), TYPE_IPMI_BMC_SIMULATOR);
	}

	static void pnv_gen_oem_sel(IPMIBmc *bmc, uint8_t reboot)
	{
	/* IPMI SEL Event are 16 bytes long */
	OemSel sel = {
	.id = { 0x55 , 0x55 },
	.type = 0xC0, /* OEM */
	.manuf_id = { 0x0, 0x0, 0x0 },
	.timestamp = { 0x0, 0x0, 0x0, 0x0 },
	.netfun = 0x3A, /* IBM */
	.cmd = 0x04, /* AMI OEM SEL Power Notification */
	.data = { reboot, 0xFF, 0xFF, 0xFF },
	};

	ipmi_bmc_gen_event(bmc, (uint8_t ) &sel, 0 / do not log the event */);
	}

	void pnv_bmc_powerdown(IPMIBmc *bmc)
	{
	pnv_gen_oem_sel(bmc, SOFT_OFF);
	}

	void pnv_dt_bmc_sensors(IPMIBmc bmc, void fdt)
	{
	int offset;
	int i;
	const struct ipmi_sdr_compact *sdr;
	uint16_t nextrec;

	if (!pnv_bmc_is_simulator(bmc)) {
	return;
	}

	offset = fdt_add_subnode(fdt, 0, "bmc");
	_FDT(offset);

	_FDT((fdt_setprop_string(fdt, offset, "name", "bmc")));
	offset = fdt_add_subnode(fdt, offset, "sensors");
	_FDT(offset);

	_FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0x1)));
	_FDT((fdt_setprop_cell(fdt, offset, "#size-cells", 0x0)));

	for (i = 0; !ipmi_bmc_sdr_find(bmc, i, &sdr, &nextrec); i++) {
	int off;
	char *name;

	if (sdr->header.rec_type != IPMI_SDR_COMPACT_TYPE &&
	sdr->header.rec_type != IPMI_SDR_FULL_TYPE) {
	continue;
	}

	name = g_strdup_printf("sensor@%x", sdr->sensor_owner_number);
	off = fdt_add_subnode(fdt, offset, name);
	_FDT(off);
	g_free(name);

	_FDT((fdt_setprop_cell(fdt, off, "reg", sdr->sensor_owner_number)));
	_FDT((fdt_setprop_string(fdt, off, "name", "sensor")));
	_FDT((fdt_setprop_string(fdt, off, "compatible", "ibm,ipmi-sensor")));
	_FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-reading-type",
	sdr->reading_type)));
	_FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-id",
	sdr->entity_id)));
	_FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-instance",
	sdr->entity_instance)));
	_FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-type",
	sdr->sensor_type)));
	}
	}

	/*
	* HIOMAP protocol handler
	*/
	#define HIOMAP_C_RESET 1
	#define HIOMAP_C_GET_INFO 2
	#define HIOMAP_C_GET_FLASH_INFO 3
	#define HIOMAP_C_CREATE_READ_WINDOW 4
	#define HIOMAP_C_CLOSE_WINDOW 5
	#define HIOMAP_C_CREATE_WRITE_WINDOW 6
	#define HIOMAP_C_MARK_DIRTY 7
	#define HIOMAP_C_FLUSH 8
	#define HIOMAP_C_ACK 9
	#define HIOMAP_C_ERASE 10
	#define HIOMAP_C_DEVICE_NAME 11
	#define HIOMAP_C_LOCK 12

	#define BLOCK_SHIFT 12 /* 4K */

	static uint16_t bytes_to_blocks(uint32_t bytes)
	{
	return bytes >> BLOCK_SHIFT;
	}

	static uint32_t blocks_to_bytes(uint16_t blocks)
	{
	return blocks << BLOCK_SHIFT;
	}

	static int hiomap_erase(PnvPnor *pnor, uint32_t offset, uint32_t size)
	{
	MemTxResult result;
	int i;

	for (i = 0; i < size / 4; i++) {
	result = memory_region_dispatch_write(&pnor->mmio, offset + i * 4,
	0xFFFFFFFF, MO_32,
	MEMTXATTRS_UNSPECIFIED);
	if (result != MEMTX_OK) {
	return -1;
	}
	}
	return 0;
	}

	static void hiomap_cmd(IPMIBmcSim ibs, uint8_t cmd, unsigned int cmd_len,
	RspBuffer *rsp)
	{
	PnvPnor *pnor = PNV_PNOR(object_property_get_link(OBJECT(ibs), "pnor",
	&error_abort));
	uint32_t pnor_size = pnor->size;
	uint32_t pnor_addr = PNOR_SPI_OFFSET;
	bool readonly = false;

	rsp_buffer_push(rsp, cmd[2]);
	rsp_buffer_push(rsp, cmd[3]);

	switch (cmd[2]) {
	case HIOMAP_C_MARK_DIRTY:
	case HIOMAP_C_FLUSH:
	case HIOMAP_C_ACK:
	break;

	case HIOMAP_C_ERASE:
	if (hiomap_erase(pnor, blocks_to_bytes(cmd[5] << 8 \| cmd[4]),
	blocks_to_bytes(cmd[7] << 8 \| cmd[6]))) {
	rsp_buffer_set_error(rsp, IPMI_CC_UNSPECIFIED);
	}
	break;

	case HIOMAP_C_GET_INFO:
	rsp_buffer_push(rsp, 2); /* Version 2 */
	rsp_buffer_push(rsp, BLOCK_SHIFT); /* block size */
	rsp_buffer_push(rsp, 0); /* Timeout */
	rsp_buffer_push(rsp, 0); /* Timeout */
	break;

	case HIOMAP_C_GET_FLASH_INFO:
	rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
	rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
	rsp_buffer_push(rsp, 0x01); /* erase size */
	rsp_buffer_push(rsp, 0x00); /* erase size */
	break;

	case HIOMAP_C_CREATE_READ_WINDOW:
	readonly = true;
	/* Fall through */

	case HIOMAP_C_CREATE_WRITE_WINDOW:
	memory_region_set_readonly(&pnor->mmio, readonly);
	memory_region_set_enabled(&pnor->mmio, true);

	rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) & 0xFF);
	rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) >> 8);
	rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
	rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
	rsp_buffer_push(rsp, 0x00); /* offset */
	rsp_buffer_push(rsp, 0x00); /* offset */
	break;

	case HIOMAP_C_CLOSE_WINDOW:
	memory_region_set_enabled(&pnor->mmio, false);
	break;

	case HIOMAP_C_DEVICE_NAME:
	case HIOMAP_C_RESET:
	case HIOMAP_C_LOCK:
	default:
	qemu_log_mask(LOG_GUEST_ERROR, "HIOMAP: unknown command %02X\n", cmd[2]);
	break;
	}
	}

	#define HIOMAP 0x5a

	static const IPMICmdHandler hiomap_cmds[] = {
	[HIOMAP] = { hiomap_cmd, 3 },
	};

	static const IPMINetfn hiomap_netfn = {
	.cmd_nums = ARRAY_SIZE(hiomap_cmds),
	.cmd_handlers = hiomap_cmds
	};


	void pnv_bmc_set_pnor(IPMIBmc bmc, PnvPnor pnor)
	{
	if (!pnv_bmc_is_simulator(bmc)) {
	return;
	}

	object_ref(OBJECT(pnor));
	object_property_add_const_link(OBJECT(bmc), "pnor", OBJECT(pnor));

	/* Install the HIOMAP protocol handlers to access the PNOR */
	ipmi_sim_register_netfn(IPMI_BMC_SIMULATOR(bmc), IPMI_NETFN_OEM,
	&hiomap_netfn);
	}

	/*
	* Instantiate the machine BMC. PowerNV uses the QEMU internal
	* simulator but it could also be external.
	*/
	IPMIBmc pnv_bmc_create(PnvPnor pnor)
	{
	DeviceState *dev;

	dev = qdev_new(TYPE_IPMI_BMC_SIMULATOR);
	qdev_realize(dev, NULL, &error_fatal);
	pnv_bmc_set_pnor(IPMI_BMC(dev), pnor);

	return IPMI_BMC(dev);
	}

	typedef struct ForeachArgs {
	const char *name;
	Object *obj;
	} ForeachArgs;

	static int bmc_find(Object child, void opaque)
	{
	ForeachArgs *args = opaque;

	if (object_dynamic_cast(child, args->name)) {
	if (args->obj) {
	return 1;
	}
	args->obj = child;
	}
	return 0;
	}

	IPMIBmc pnv_bmc_find(Error *errp)
	{
	ForeachArgs args = { TYPE_IPMI_BMC, NULL };
	int ret;

	ret = object_child_foreach_recursive(object_get_root(), bmc_find, &args);
	if (ret) {
	error_setg(errp, "machine should have only one BMC device. "
	"Use '-nodefaults'");
	return NULL;
	}

	return args.obj ? IPMI_BMC(args.obj) : NULL;
	}