PPC: ePAPR: Convert hcall header to uapi (round 2)

The new uapi framework splits kernel internal and user space exported
bits of header files more cleanly. Adjust the ePAPR header accordingly.

Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 59 insertions, 419 deletions

diff --git a/arch/powerpc/include/uapi/asm/epapr_hcalls.h b/arch/powerpc/include/uapi/asm/epapr_hcalls.h
index 58997afcd085..7f9c74b46704 100644
--- a/arch/powerpc/include/uapi/asm/epapr_hcalls.h
+++ b/arch/powerpc/include/uapi/asm/epapr_hcalls.h
@@ -37,422 +37,62 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-/* A "hypercall" is an "sc 1" instruction.  This header file file provides C
- * wrapper functions for the ePAPR hypervisor interface.  It is inteded
- * for use by Linux device drivers and other operating systems.
- *
- * The hypercalls are implemented as inline assembly, rather than assembly
- * language functions in a .S file, for optimization.  It allows
- * the caller to issue the hypercall instruction directly, improving both
- * performance and memory footprint.
- */
-
-#ifndef _EPAPR_HCALLS_H
-#define _EPAPR_HCALLS_H
-
-#include <uapi/asm/epapr_hcalls.h>
-
-#ifndef __ASSEMBLY__
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <asm/byteorder.h>
-
-/*
- * Hypercall register clobber list
- *
- * These macros are used to define the list of clobbered registers during a
- * hypercall.  Technically, registers r0 and r3-r12 are always clobbered,
- * but the gcc inline assembly syntax does not allow us to specify registers
- * on the clobber list that are also on the input/output list.  Therefore,
- * the lists of clobbered registers depends on the number of register
- * parmeters ("+r" and "=r") passed to the hypercall.
- *
- * Each assembly block should use one of the HCALL_CLOBBERSx macros.  As a
- * general rule, 'x' is the number of parameters passed to the assembly
- * block *except* for r11.
- *
- * If you're not sure, just use the smallest value of 'x' that does not
- * generate a compilation error.  Because these are static inline functions,
- * the compiler will only check the clobber list for a function if you
- * compile code that calls that function.
- *
- * r3 and r11 are not included in any clobbers list because they are always
- * listed as output registers.
- *
- * XER, CTR, and LR are currently listed as clobbers because it's uncertain
- * whether they will be clobbered.
- *
- * Note that r11 can be used as an output parameter.
- *
- * The "memory" clobber is only necessary for hcalls where the Hypervisor
- * will read or write guest memory. However, we add it to all hcalls because
- * the impact is minimal, and we want to ensure that it's present for the
- * hcalls that need it.
-*/
-
-/* List of common clobbered registers.  Do not use this macro. */
-#define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc", "memory"
-
-#define EV_HCALL_CLOBBERS8 EV_HCALL_CLOBBERS
-#define EV_HCALL_CLOBBERS7 EV_HCALL_CLOBBERS8, "r10"
-#define EV_HCALL_CLOBBERS6 EV_HCALL_CLOBBERS7, "r9"
-#define EV_HCALL_CLOBBERS5 EV_HCALL_CLOBBERS6, "r8"
-#define EV_HCALL_CLOBBERS4 EV_HCALL_CLOBBERS5, "r7"
-#define EV_HCALL_CLOBBERS3 EV_HCALL_CLOBBERS4, "r6"
-#define EV_HCALL_CLOBBERS2 EV_HCALL_CLOBBERS3, "r5"
-#define EV_HCALL_CLOBBERS1 EV_HCALL_CLOBBERS2, "r4"
-
-extern bool epapr_paravirt_enabled;
-extern u32 epapr_hypercall_start[];
-
-/*
- * 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.
- */
-
-/**
- * ev_int_set_config - configure the specified interrupt
- * @interrupt: the interrupt number
- * @config: configuration for this interrupt
- * @priority: interrupt priority
- * @destination: destination CPU number
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_int_set_config(unsigned int interrupt,
-	uint32_t config, unsigned int priority, uint32_t destination)
-{
-	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");
-
-	r11 = EV_HCALL_TOKEN(EV_INT_SET_CONFIG);
-	r3  = interrupt;
-	r4  = config;
-	r5  = priority;
-	r6  = destination;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6)
-		: : EV_HCALL_CLOBBERS4
-	);
-
-	return r3;
-}
-
-/**
- * ev_int_get_config - return the config of the specified interrupt
- * @interrupt: the interrupt number
- * @config: returned configuration for this interrupt
- * @priority: returned interrupt priority
- * @destination: returned destination CPU number
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_int_get_config(unsigned int interrupt,
-	uint32_t *config, unsigned int *priority, uint32_t *destination)
-{
-	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");
-
-	r11 = EV_HCALL_TOKEN(EV_INT_GET_CONFIG);
-	r3 = interrupt;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3), "=r" (r4), "=r" (r5), "=r" (r6)
-		: : EV_HCALL_CLOBBERS4
-	);
-
-	*config = r4;
-	*priority = r5;
-	*destination = r6;
-
-	return r3;
-}
-
-/**
- * ev_int_set_mask - sets the mask for the specified interrupt source
- * @interrupt: the interrupt number
- * @mask: 0=enable interrupts, 1=disable interrupts
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_int_set_mask(unsigned int interrupt,
-	unsigned int mask)
-{
-	register uintptr_t r11 __asm__("r11");
-	register uintptr_t r3 __asm__("r3");
-	register uintptr_t r4 __asm__("r4");
-
-	r11 = EV_HCALL_TOKEN(EV_INT_SET_MASK);
-	r3 = interrupt;
-	r4 = mask;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3), "+r" (r4)
-		: : EV_HCALL_CLOBBERS2
-	);
-
-	return r3;
-}
-
-/**
- * ev_int_get_mask - returns the mask for the specified interrupt source
- * @interrupt: the interrupt number
- * @mask: returned mask for this interrupt (0=enabled, 1=disabled)
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_int_get_mask(unsigned int interrupt,
-	unsigned int *mask)
-{
-	register uintptr_t r11 __asm__("r11");
-	register uintptr_t r3 __asm__("r3");
-	register uintptr_t r4 __asm__("r4");
-
-	r11 = EV_HCALL_TOKEN(EV_INT_GET_MASK);
-	r3 = interrupt;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3), "=r" (r4)
-		: : EV_HCALL_CLOBBERS2
-	);
-
-	*mask = r4;
-
-	return r3;
-}
-
-/**
- * ev_int_eoi - signal the end of interrupt processing
- * @interrupt: the interrupt number
- *
- * This function signals the end of processing for the the specified
- * interrupt, which must be the interrupt currently in service. By
- * definition, this is also the highest-priority interrupt.
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_int_eoi(unsigned int interrupt)
-{
-	register uintptr_t r11 __asm__("r11");
-	register uintptr_t r3 __asm__("r3");
-
-	r11 = EV_HCALL_TOKEN(EV_INT_EOI);
-	r3 = interrupt;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3)
-		: : EV_HCALL_CLOBBERS1
-	);
-
-	return r3;
-}
-
-/**
- * ev_byte_channel_send - send characters to a byte stream
- * @handle: byte stream handle
- * @count: (input) num of chars to send, (output) num chars sent
- * @buffer: pointer to a 16-byte buffer
- *
- * @buffer must be at least 16 bytes long, because all 16 bytes will be
- * read from memory into registers, even if count < 16.
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_byte_channel_send(unsigned int handle,
-	unsigned int *count, const char buffer[EV_BYTE_CHANNEL_MAX_BYTES])
-{
-	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");
-	const uint32_t *p = (const uint32_t *) buffer;
-
-	r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_SEND);
-	r3 = handle;
-	r4 = *count;
-	r5 = be32_to_cpu(p[0]);
-	r6 = be32_to_cpu(p[1]);
-	r7 = be32_to_cpu(p[2]);
-	r8 = be32_to_cpu(p[3]);
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3),
-		  "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7), "+r" (r8)
-		: : EV_HCALL_CLOBBERS6
-	);
-
-	*count = r4;
-
-	return r3;
-}
-
-/**
- * ev_byte_channel_receive - fetch characters from a byte channel
- * @handle: byte channel handle
- * @count: (input) max num of chars to receive, (output) num chars received
- * @buffer: pointer to a 16-byte buffer
- *
- * The size of @buffer must be at least 16 bytes, even if you request fewer
- * than 16 characters, because we always write 16 bytes to @buffer.  This is
- * for performance reasons.
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_byte_channel_receive(unsigned int handle,
-	unsigned int *count, char buffer[EV_BYTE_CHANNEL_MAX_BYTES])
-{
-	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");
-	uint32_t *p = (uint32_t *) buffer;
-
-	r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_RECEIVE);
-	r3 = handle;
-	r4 = *count;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3), "+r" (r4),
-		  "=r" (r5), "=r" (r6), "=r" (r7), "=r" (r8)
-		: : EV_HCALL_CLOBBERS6
-	);
-
-	*count = r4;
-	p[0] = cpu_to_be32(r5);
-	p[1] = cpu_to_be32(r6);
-	p[2] = cpu_to_be32(r7);
-	p[3] = cpu_to_be32(r8);
-
-	return r3;
-}
-
-/**
- * ev_byte_channel_poll - returns the status of the byte channel buffers
- * @handle: byte channel handle
- * @rx_count: returned count of bytes in receive queue
- * @tx_count: returned count of free space in transmit queue
- *
- * This function reports the amount of data in the receive queue (i.e. the
- * number of bytes you can read), and the amount of free space in the transmit
- * queue (i.e. the number of bytes you can write).
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_byte_channel_poll(unsigned int handle,
-	unsigned int *rx_count,	unsigned int *tx_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");
-
-	r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_POLL);
-	r3 = handle;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3), "=r" (r4), "=r" (r5)
-		: : EV_HCALL_CLOBBERS3
-	);
-
-	*rx_count = r4;
-	*tx_count = r5;
-
-	return r3;
-}
-
-/**
- * ev_int_iack - acknowledge an interrupt
- * @handle: handle to the target interrupt controller
- * @vector: returned interrupt vector
- *
- * If handle is zero, the function returns the next interrupt source
- * number to be handled irrespective of the hierarchy or cascading
- * of interrupt controllers. If non-zero, specifies a handle to the
- * interrupt controller that is the target of the acknowledge.
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_int_iack(unsigned int handle,
-	unsigned int *vector)
-{
-	register uintptr_t r11 __asm__("r11");
-	register uintptr_t r3 __asm__("r3");
-	register uintptr_t r4 __asm__("r4");
-
-	r11 = EV_HCALL_TOKEN(EV_INT_IACK);
-	r3 = handle;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3), "=r" (r4)
-		: : EV_HCALL_CLOBBERS2
-	);
-
-	*vector = r4;
-
-	return r3;
-}
-
-/**
- * ev_doorbell_send - send a doorbell to another partition
- * @handle: doorbell send handle
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_doorbell_send(unsigned int handle)
-{
-	register uintptr_t r11 __asm__("r11");
-	register uintptr_t r3 __asm__("r3");
-
-	r11 = EV_HCALL_TOKEN(EV_DOORBELL_SEND);
-	r3 = handle;
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "+r" (r3)
-		: : EV_HCALL_CLOBBERS1
-	);
-
-	return r3;
-}
-
-/**
- * ev_idle -- wait for next interrupt on this core
- *
- * Returns 0 for success, or an error code.
- */
-static inline unsigned int ev_idle(void)
-{
-	register uintptr_t r11 __asm__("r11");
-	register uintptr_t r3 __asm__("r3");
-
-	r11 = EV_HCALL_TOKEN(EV_IDLE);
-
-	asm volatile("bl	epapr_hypercall_start"
-		: "+r" (r11), "=r" (r3)
-		: : EV_HCALL_CLOBBERS1
-	);
-
-	return r3;
-}
-#endif /* !__ASSEMBLY__ */
-#endif
+#ifndef _UAPI_ASM_POWERPC_EPAPR_HCALLS_H
+#define _UAPI_ASM_POWERPC_EPAPR_HCALLS_H
+
+#define EV_BYTE_CHANNEL_SEND		1
+#define EV_BYTE_CHANNEL_RECEIVE		2
+#define EV_BYTE_CHANNEL_POLL		3
+#define EV_INT_SET_CONFIG		4
+#define EV_INT_GET_CONFIG		5
+#define EV_INT_SET_MASK			6
+#define EV_INT_GET_MASK			7
+#define EV_INT_IACK			9
+#define EV_INT_EOI			10
+#define EV_INT_SEND_IPI			11
+#define EV_INT_SET_TASK_PRIORITY	12
+#define EV_INT_GET_TASK_PRIORITY	13
+#define EV_DOORBELL_SEND		14
+#define EV_MSGSND			15
+#define EV_IDLE				16
+
+/* vendor ID: epapr */
+#define EV_LOCAL_VENDOR_ID		0	/* for private use */
+#define EV_EPAPR_VENDOR_ID		1
+#define EV_FSL_VENDOR_ID		2	/* Freescale Semiconductor */
+#define EV_IBM_VENDOR_ID		3	/* IBM */
+#define EV_GHS_VENDOR_ID		4	/* Green Hills Software */
+#define EV_ENEA_VENDOR_ID		5	/* Enea */
+#define EV_WR_VENDOR_ID			6	/* Wind River Systems */
+#define EV_AMCC_VENDOR_ID		7	/* Applied Micro Circuits */
+#define EV_KVM_VENDOR_ID		42	/* KVM */
+
+/* The max number of bytes that a byte channel can send or receive per call */
+#define EV_BYTE_CHANNEL_MAX_BYTES	16
+
+
+#define _EV_HCALL_TOKEN(id, num) (((id) << 16) | (num))
+#define EV_HCALL_TOKEN(hcall_num) _EV_HCALL_TOKEN(EV_EPAPR_VENDOR_ID, hcall_num)
+
+/* epapr return codes */
+#define EV_SUCCESS		0
+#define EV_EPERM		1	/* Operation not permitted */
+#define EV_ENOENT		2	/*  Entry Not Found */
+#define EV_EIO			3	/* I/O error occured */
+#define EV_EAGAIN		4	/* The operation had insufficient
+					 * resources to complete and should be
+					 * retried
+					 */
+#define EV_ENOMEM		5	/* There was insufficient memory to
+					 * complete the operation */
+#define EV_EFAULT		6	/* Bad guest address */
+#define EV_ENODEV		7	/* No such device */
+#define EV_EINVAL		8	/* An argument supplied to the hcall
+					   was out of range or invalid */
+#define EV_INTERNAL		9	/* An internal error occured */
+#define EV_CONFIG		10	/* A configuration error was detected */
+#define EV_INVALID_STATE	11	/* The object is in an invalid state */
+#define EV_UNIMPLEMENTED	12	/* Unimplemented hypercall */
+#define EV_BUFFER_OVERFLOW	13	/* Caller-supplied buffer too small */
+
+#endif /* _UAPI_ASM_POWERPC_EPAPR_HCALLS_H */