/*
 * Copyright © 2019 Raspberry Pi Ltd
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef V3DV_CL_H
#define V3DV_CL_H

#include "broadcom/cle/v3d_packet_helpers.h"

#include "util/list.h"
#include "util/macros.h"

struct v3dv_bo;
struct v3dv_job;
struct v3dv_cl;

void v3dv_job_add_bo(struct v3dv_job *job, struct v3dv_bo *bo);

/**
 * Undefined structure, used for typechecking that you're passing the pointers
 * to these functions correctly.
 */
struct v3dv_cl_out;

/** A reference to a BO used in the CL packing functions */
struct v3dv_cl_reloc {
   struct v3dv_bo *bo;
   uint32_t offset;
};

static inline void
pack_emit_reloc(void *cl, const void *reloc) {}

#define __gen_user_data struct v3dv_cl
#define __gen_address_type struct v3dv_cl_reloc
#define __gen_address_offset(reloc) (((reloc)->bo ? (reloc)->bo->offset : 0) + \
                                     (reloc)->offset)
#define __gen_emit_reloc cl_pack_emit_reloc
#define __gen_unpack_address(cl, s, e) __unpack_address(cl, s, e)

struct v3dv_cl {
   void *base;
   struct v3dv_job *job;
   struct v3dv_cl_out *next;
   struct v3dv_bo *bo;
   uint32_t size;
   struct list_head bo_list;
};

static inline struct v3dv_cl_reloc
__unpack_address(const uint8_t *cl, uint32_t s, uint32_t e)
{
    struct v3dv_cl_reloc reloc =
            { NULL, __gen_unpack_uint(cl, s, e) << (31 - (e - s)) };
    return reloc;
}

static inline uint32_t
v3dv_cl_offset(struct v3dv_cl *cl)
{
   return (char *)cl->next - (char *)cl->base;
}

static inline struct v3dv_cl_reloc
v3dv_cl_address(struct v3dv_bo *bo, uint32_t offset)
{
   struct v3dv_cl_reloc reloc = {
      .bo = bo,
      .offset = offset,
   };
   return reloc;
}

static inline struct v3dv_cl_reloc
v3dv_cl_get_address(struct v3dv_cl *cl)
{
   return (struct v3dv_cl_reloc){ .bo = cl->bo, .offset = v3dv_cl_offset(cl) };
}

void v3dv_cl_init(struct v3dv_job *job, struct v3dv_cl *cl);
void v3dv_cl_destroy(struct v3dv_cl *cl);

static inline struct v3dv_cl_out *
cl_start(struct v3dv_cl *cl)
{
   return cl->next;
}

static inline void
cl_end(struct v3dv_cl *cl, struct v3dv_cl_out *next)
{
   cl->next = next;
   assert(v3dv_cl_offset(cl) <= cl->size);
}

static inline void
cl_advance(struct v3dv_cl_out **cl, uint32_t n)
{
   (*cl) = (struct v3dv_cl_out *)((char *)(*cl) + n);
}

static inline void
cl_advance_and_end(struct v3dv_cl *cl, uint32_t n)
{
   cl->next = (struct v3dv_cl_out *)((char *)(cl->next) + n);
   assert(v3dv_cl_offset(cl) <= cl->size);
}

static inline void
cl_aligned_u32(struct v3dv_cl_out **cl, uint32_t n)
{
   *(uint32_t *)(*cl) = n;
   cl_advance(cl, 4);
}

static inline void
cl_aligned_f(struct v3dv_cl_out **cl, float f)
{
   cl_aligned_u32(cl, fui(f));
}

static inline void
cl_aligned_reloc(struct v3dv_cl *cl,
                 struct v3dv_cl_out **cl_out,
                 struct v3dv_bo *bo,
                 uint32_t offset)
{
   cl_aligned_u32(cl_out, bo->offset + offset);
   v3dv_job_add_bo(cl->job, bo);
}

uint32_t v3dv_cl_ensure_space(struct v3dv_cl *cl, uint32_t space, uint32_t alignment);
void v3dv_cl_ensure_space_with_branch(struct v3dv_cl *cl, uint32_t space);

#define cl_packet_header(packet) V3DX(packet ## _header)
#define cl_packet_length(packet) V3DX(packet ## _length)
#define cl_aligned_packet_length(packet, alignment) ALIGN_POT(cl_packet_length(packet), alignment)
#define cl_packet_pack(packet)   V3DX(packet ## _pack)
#define cl_packet_struct(packet) V3DX(packet)

/* Macro for setting up and emit of a CL struct.  A temporary unpacked struct
 * is created, which you get to set fields in of the form:
 *
 * cl_emit(bcl, FLAT_SHADE_FLAGS, flags) {
 *     .flags.flat_shade_flags = 1 << 2,
 * }
 *
 * or default values only can be emitted with just:
 *
 * cl_emit(bcl, FLAT_SHADE_FLAGS, flags);
 *
 * The trick here is that we make a for loop that will execute the body
 * (either the block or the ';' after the macro invocation) exactly once.
 */
#define cl_emit(cl, packet, name)                                \
        for (struct cl_packet_struct(packet) name = {            \
                cl_packet_header(packet)                         \
        },                                                       \
        *_loop_terminate = &name;                                \
        __builtin_expect(_loop_terminate != NULL, 1);            \
        ({                                                       \
                struct v3dv_cl_out *cl_out = cl_start(cl);        \
                cl_packet_pack(packet)(cl, (uint8_t *)cl_out, &name); \
                cl_advance_and_end(cl, cl_packet_length(packet)); \
                _loop_terminate = NULL;                          \
                assert(v3dv_cl_offset(cl) <= (cl)->size);        \
        }))                                                      \

/* Macro for setting up and emit of a CL struct, where part of the setting up
 * comes from a prepacked buffer. So the use is similar to cl_emit, where you
 * set individual values, and the rest of values come from prepacked.
 *
 * Note that setting a value with this macro will not override the values
 * coming from the prepacked buffer, as it does an OR operation. That means
 * that the prepacked buffer is usually reserved for values that we know that
 * will not change in advance before the emission.
 */
#define cl_emit_with_prepacked(cl, packet, prepacked, name)      \
        for (struct cl_packet_struct(packet) name = {            \
                cl_packet_header(packet)                         \
        },                                                       \
        *_loop_terminate = &name;                                \
        __builtin_expect(_loop_terminate != NULL, 1);            \
        ({                                                       \
                struct v3dv_cl_out *cl_out = cl_start(cl);        \
                uint8_t packed[cl_packet_length(packet)];         \
                cl_packet_pack(packet)(cl, packed, &name);       \
                for (int _i = 0; _i < cl_packet_length(packet); _i++) \
                        ((uint8_t *)cl_out)[_i] = packed[_i] | (prepacked)[_i]; \
                cl_advance_and_end(cl, cl_packet_length(packet)); \
                _loop_terminate = NULL;                          \
        }))                                                      \

/**
 * Helper function called by the XML-generated pack functions for filling in
 * an address field in shader records.
 *
 * Since we have a private address space as of V3D, our BOs can have lifelong
 * offsets, and all the kernel needs to know is which BOs need to be paged in
 * for this exec.
 */
static inline void
cl_pack_emit_reloc(struct v3dv_cl *cl, const struct v3dv_cl_reloc *reloc)
{
        if (reloc->bo)
                v3dv_job_add_bo(cl->job, reloc->bo);
}

#define cl_emit_prepacked_sized(cl, packet, psize) do {          \
        memcpy((cl)->next, packet, psize);                       \
        cl_advance(&(cl)->next, psize);                          \
        assert(v3dv_cl_offset(cl) <= (cl)->size);                \
} while (0)

#define cl_emit_prepacked(cl, packet) \
        cl_emit_prepacked_sized(cl, packet, sizeof(*(packet)))

#define v3dvx_pack(packed, packet, name)                         \
        for (struct cl_packet_struct(packet) name = {            \
                cl_packet_header(packet)                         \
        },                                                       \
        *_loop_terminate = &name;                                \
        __builtin_expect(_loop_terminate != NULL, 1);            \
        ({                                                       \
                cl_packet_pack(packet)(NULL, (uint8_t *)packed, &name); \
                VG(VALGRIND_CHECK_MEM_IS_DEFINED((uint8_t *)packed, \
                                                 cl_packet_length(packet))); \
                _loop_terminate = NULL;                          \
        }))                                                      \

#endif /* V3DV_CL_H */
