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linux/arch/powerpc/include/asm/fsl_hcalls.h
Timur Tabi bd497fc978 powerpc: introduce ePAPR embedded hypervisor hcall interface 
ePAPR hypervisors provide operating system services via a "hypercall"
interface.  The following steps need to be performed to make an hcall:

1. Load r11 with the hcall number
2. Load specific other registers with parameters
3. Issue instrucion "sc 1"
4. The return code is in r3
5. Other returned parameters are in other registers.

To provide this service to the kernel, these steps are wrapped in inline
assembly functions.  Standard ePAPR hcalls are in epapr_hcalls.h, and
Freescale extensions are in fsl_hcalls.h.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-06-27 08:30:19 -05:00

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/*
* Freescale hypervisor call interface
*
* Copyright 2008-2010 Freescale Semiconductor, Inc.
*
* Author: Timur Tabi <timur@freescale.com>
*
* This file is provided under a dual BSD/GPL license. When using or
* redistributing this file, you may do so under either license.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Freescale Semiconductor nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation, either version 2 of that License or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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.
*/
#ifndef _FSL_HCALLS_H
#define _FSL_HCALLS_H
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/byteorder.h>
#include <asm/epapr_hcalls.h>
#define FH_API_VERSION 1
#define FH_ERR_GET_INFO 1
#define FH_PARTITION_GET_DTPROP 2
#define FH_PARTITION_SET_DTPROP 3
#define FH_PARTITION_RESTART 4
#define FH_PARTITION_GET_STATUS 5
#define FH_PARTITION_START 6
#define FH_PARTITION_STOP 7
#define FH_PARTITION_MEMCPY 8
#define FH_DMA_ENABLE 9
#define FH_DMA_DISABLE 10
#define FH_SEND_NMI 11
#define FH_VMPIC_GET_MSIR 12
#define FH_SYSTEM_RESET 13
#define FH_GET_CORE_STATE 14
#define FH_ENTER_NAP 15
#define FH_EXIT_NAP 16
#define FH_CLAIM_DEVICE 17
#define FH_PARTITION_STOP_DMA 18
/* vendor ID: Freescale Semiconductor */
#define FH_HCALL_TOKEN(num) _EV_HCALL_TOKEN(EV_FSL_VENDOR_ID, num)
/*
* We use "uintptr_t" to define a register because it's guaranteed to be a
* 32-bit integer on a 32-bit platform, and a 64-bit integer on a 64-bit
* platform.
*
* All registers are either input/output or output only. Registers that are
* initialized before making the hypercall are input/output. All
* input/output registers are represented with "+r". Output-only registers
* are represented with "=r". Do not specify any unused registers. The
* clobber list will tell the compiler that the hypercall modifies those
* registers, which is good enough.
*/
/**
* fh_send_nmi - send NMI to virtual cpu(s).
* @vcpu_mask: send NMI to virtual cpu(s) specified by this mask.
*
* Returns 0 for success, or EINVAL for invalid vcpu_mask.
*/
static inline unsigned int fh_send_nmi(unsigned int vcpu_mask)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_SEND_NMI);
r3 = vcpu_mask;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
/* Arbitrary limits to avoid excessive memory allocation in hypervisor */
#define FH_DTPROP_MAX_PATHLEN 4096
#define FH_DTPROP_MAX_PROPLEN 32768
/**
* fh_partiton_get_dtprop - get a property from a guest device tree.
* @handle: handle of partition whose device tree is to be accessed
* @dtpath_addr: physical address of device tree path to access
* @propname_addr: physical address of name of property
* @propvalue_addr: physical address of property value buffer
* @propvalue_len: length of buffer on entry, length of property on return
*
* Returns zero on success, non-zero on error.
*/
static inline unsigned int fh_partition_get_dtprop(int handle,
uint64_t dtpath_addr,
uint64_t propname_addr,
uint64_t propvalue_addr,
uint32_t *propvalue_len)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
register uintptr_t r5 __asm__("r5");
register uintptr_t r6 __asm__("r6");
register uintptr_t r7 __asm__("r7");
register uintptr_t r8 __asm__("r8");
register uintptr_t r9 __asm__("r9");
register uintptr_t r10 __asm__("r10");
r11 = FH_HCALL_TOKEN(FH_PARTITION_GET_DTPROP);
r3 = handle;
#ifdef CONFIG_PHYS_64BIT
r4 = dtpath_addr >> 32;
r6 = propname_addr >> 32;
r8 = propvalue_addr >> 32;
#else
r4 = 0;
r6 = 0;
r8 = 0;
#endif
r5 = (uint32_t)dtpath_addr;
r7 = (uint32_t)propname_addr;
r9 = (uint32_t)propvalue_addr;
r10 = *propvalue_len;
__asm__ __volatile__ ("sc 1"
: "+r" (r11),
"+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7),
"+r" (r8), "+r" (r9), "+r" (r10)
: : EV_HCALL_CLOBBERS8
);
*propvalue_len = r4;
return r3;
}
/**
* Set a property in a guest device tree.
* @handle: handle of partition whose device tree is to be accessed
* @dtpath_addr: physical address of device tree path to access
* @propname_addr: physical address of name of property
* @propvalue_addr: physical address of property value
* @propvalue_len: length of property
*
* Returns zero on success, non-zero on error.
*/
static inline unsigned int fh_partition_set_dtprop(int handle,
uint64_t dtpath_addr,
uint64_t propname_addr,
uint64_t propvalue_addr,
uint32_t propvalue_len)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
register uintptr_t r6 __asm__("r6");
register uintptr_t r8 __asm__("r8");
register uintptr_t r5 __asm__("r5");
register uintptr_t r7 __asm__("r7");
register uintptr_t r9 __asm__("r9");
register uintptr_t r10 __asm__("r10");
r11 = FH_HCALL_TOKEN(FH_PARTITION_SET_DTPROP);
r3 = handle;
#ifdef CONFIG_PHYS_64BIT
r4 = dtpath_addr >> 32;
r6 = propname_addr >> 32;
r8 = propvalue_addr >> 32;
#else
r4 = 0;
r6 = 0;
r8 = 0;
#endif
r5 = (uint32_t)dtpath_addr;
r7 = (uint32_t)propname_addr;
r9 = (uint32_t)propvalue_addr;
r10 = propvalue_len;
__asm__ __volatile__ ("sc 1"
: "+r" (r11),
"+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7),
"+r" (r8), "+r" (r9), "+r" (r10)
: : EV_HCALL_CLOBBERS8
);
return r3;
}
/**
* fh_partition_restart - reboot the current partition
* @partition: partition ID
*
* Returns an error code if reboot failed. Does not return if it succeeds.
*/
static inline unsigned int fh_partition_restart(unsigned int partition)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_PARTITION_RESTART);
r3 = partition;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
#define FH_PARTITION_STOPPED 0
#define FH_PARTITION_RUNNING 1
#define FH_PARTITION_STARTING 2
#define FH_PARTITION_STOPPING 3
#define FH_PARTITION_PAUSING 4
#define FH_PARTITION_PAUSED 5
#define FH_PARTITION_RESUMING 6
/**
* fh_partition_get_status - gets the status of a partition
* @partition: partition ID
* @status: returned status code
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_partition_get_status(unsigned int partition,
unsigned int *status)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
r11 = FH_HCALL_TOKEN(FH_PARTITION_GET_STATUS);
r3 = partition;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3), "=r" (r4)
: : EV_HCALL_CLOBBERS2
);
*status = r4;
return r3;
}
/**
* fh_partition_start - boots and starts execution of the specified partition
* @partition: partition ID
* @entry_point: guest physical address to start execution
*
* The hypervisor creates a 1-to-1 virtual/physical IMA mapping, so at boot
* time, guest physical address are the same as guest virtual addresses.
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_partition_start(unsigned int partition,
uint32_t entry_point, int load)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
register uintptr_t r5 __asm__("r5");
r11 = FH_HCALL_TOKEN(FH_PARTITION_START);
r3 = partition;
r4 = entry_point;
r5 = load;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3), "+r" (r4), "+r" (r5)
: : EV_HCALL_CLOBBERS3
);
return r3;
}
/**
* fh_partition_stop - stops another partition
* @partition: partition ID
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_partition_stop(unsigned int partition)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_PARTITION_STOP);
r3 = partition;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
/**
* struct fh_sg_list: definition of the fh_partition_memcpy S/G list
* @source: guest physical address to copy from
* @target: guest physical address to copy to
* @size: number of bytes to copy
* @reserved: reserved, must be zero
*
* The scatter/gather list for fh_partition_memcpy() is an array of these
* structures. The array must be guest physically contiguous.
*
* This structure must be aligned on 32-byte boundary, so that no single
* strucuture can span two pages.
*/
struct fh_sg_list {
uint64_t source; /**< guest physical address to copy from */
uint64_t target; /**< guest physical address to copy to */
uint64_t size; /**< number of bytes to copy */
uint64_t reserved; /**< reserved, must be zero */
} __attribute__ ((aligned(32)));
/**
* fh_partition_memcpy - copies data from one guest to another
* @source: the ID of the partition to copy from
* @target: the ID of the partition to copy to
* @sg_list: guest physical address of an array of &fh_sg_list structures
* @count: the number of entries in @sg_list
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_partition_memcpy(unsigned int source,
unsigned int target, phys_addr_t sg_list, unsigned int count)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
register uintptr_t r5 __asm__("r5");
register uintptr_t r6 __asm__("r6");
register uintptr_t r7 __asm__("r7");
r11 = FH_HCALL_TOKEN(FH_PARTITION_MEMCPY);
r3 = source;
r4 = target;
r5 = (uint32_t) sg_list;
#ifdef CONFIG_PHYS_64BIT
r6 = sg_list >> 32;
#else
r6 = 0;
#endif
r7 = count;
__asm__ __volatile__ ("sc 1"
: "+r" (r11),
"+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7)
: : EV_HCALL_CLOBBERS5
);
return r3;
}
/**
* fh_dma_enable - enable DMA for the specified device
* @liodn: the LIODN of the I/O device for which to enable DMA
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_dma_enable(unsigned int liodn)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_DMA_ENABLE);
r3 = liodn;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
/**
* fh_dma_disable - disable DMA for the specified device
* @liodn: the LIODN of the I/O device for which to disable DMA
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_dma_disable(unsigned int liodn)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_DMA_DISABLE);
r3 = liodn;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
/**
* fh_vmpic_get_msir - returns the MPIC-MSI register value
* @interrupt: the interrupt number
* @msir_val: returned MPIC-MSI register value
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_vmpic_get_msir(unsigned int interrupt,
unsigned int *msir_val)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
r11 = FH_HCALL_TOKEN(FH_VMPIC_GET_MSIR);
r3 = interrupt;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3), "=r" (r4)
: : EV_HCALL_CLOBBERS2
);
*msir_val = r4;
return r3;
}
/**
* fh_system_reset - reset the system
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_system_reset(void)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_SYSTEM_RESET);
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "=r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
/**
* fh_err_get_info - get platform error information
* @queue id:
* 0 for guest error event queue
* 1 for global error event queue
*
* @pointer to store the platform error data:
* platform error data is returned in registers r4 - r11
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_err_get_info(int queue, uint32_t *bufsize,
uint32_t addr_hi, uint32_t addr_lo, int peek)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
register uintptr_t r5 __asm__("r5");
register uintptr_t r6 __asm__("r6");
register uintptr_t r7 __asm__("r7");
r11 = FH_HCALL_TOKEN(FH_ERR_GET_INFO);
r3 = queue;
r4 = *bufsize;
r5 = addr_hi;
r6 = addr_lo;
r7 = peek;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6),
"+r" (r7)
: : EV_HCALL_CLOBBERS5
);
*bufsize = r4;
return r3;
}
#define FH_VCPU_RUN 0
#define FH_VCPU_IDLE 1
#define FH_VCPU_NAP 2
/**
* fh_get_core_state - get the state of a vcpu
*
* @handle: handle of partition containing the vcpu
* @vcpu: vcpu number within the partition
* @state:the current state of the vcpu, see FH_VCPU_*
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_get_core_state(unsigned int handle,
unsigned int vcpu, unsigned int *state)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
r11 = FH_HCALL_TOKEN(FH_GET_CORE_STATE);
r3 = handle;
r4 = vcpu;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3), "+r" (r4)
: : EV_HCALL_CLOBBERS2
);
*state = r4;
return r3;
}
/**
* fh_enter_nap - enter nap on a vcpu
*
* Note that though the API supports entering nap on a vcpu other
* than the caller, this may not be implmented and may return EINVAL.
*
* @handle: handle of partition containing the vcpu
* @vcpu: vcpu number within the partition
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_enter_nap(unsigned int handle, unsigned int vcpu)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
r11 = FH_HCALL_TOKEN(FH_ENTER_NAP);
r3 = handle;
r4 = vcpu;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3), "+r" (r4)
: : EV_HCALL_CLOBBERS2
);
return r3;
}
/**
* fh_exit_nap - exit nap on a vcpu
* @handle: handle of partition containing the vcpu
* @vcpu: vcpu number within the partition
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_exit_nap(unsigned int handle, unsigned int vcpu)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
register uintptr_t r4 __asm__("r4");
r11 = FH_HCALL_TOKEN(FH_EXIT_NAP);
r3 = handle;
r4 = vcpu;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3), "+r" (r4)
: : EV_HCALL_CLOBBERS2
);
return r3;
}
/**
* fh_claim_device - claim a "claimable" shared device
* @handle: fsl,hv-device-handle of node to claim
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_claim_device(unsigned int handle)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_CLAIM_DEVICE);
r3 = handle;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
/**
* Run deferred DMA disabling on a partition's private devices
*
* This applies to devices which a partition owns either privately,
* or which are claimable and still actively owned by that partition,
* and which do not have the no-dma-disable property.
*
* @handle: partition (must be stopped) whose DMA is to be disabled
*
* Returns 0 for success, or an error code.
*/
static inline unsigned int fh_partition_stop_dma(unsigned int handle)
{
register uintptr_t r11 __asm__("r11");
register uintptr_t r3 __asm__("r3");
r11 = FH_HCALL_TOKEN(FH_PARTITION_STOP_DMA);
r3 = handle;
__asm__ __volatile__ ("sc 1"
: "+r" (r11), "+r" (r3)
: : EV_HCALL_CLOBBERS1
);
return r3;
}
#endif
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