/*
 * Copyright 2023 Red Hat Inc.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 */
#include <subdev/bar/gf100.h>

#include <core/mm.h>
#include <subdev/fb.h>
#include <subdev/gsp.h>
#include <subdev/instmem.h>
#include <subdev/mmu/vmm.h>

#include "nvrm/bar.h"
#include "nvrm/rpcfn.h"

static void
r535_bar_flush(struct nvkm_bar *bar)
{
        /* Use NV_PFLUSH in resume path - needed on R570 to flush writes before
         * BAR2 page tables have been restored.
         */
        if (unlikely(!bar->bar2)) {
                g84_bar_flush(bar);
                return;
        }

        ioread32_native(bar->flushBAR2);
}

static void
r535_bar_bar2_wait(struct nvkm_bar *base)
{
}

static int
r535_bar_bar2_update_pde(struct nvkm_gsp *gsp, u8 page_shift, u64 pdbe)
{
        rpc_update_bar_pde_v15_00 *rpc;

        rpc = nvkm_gsp_rpc_get(gsp, NV_VGPU_MSG_FUNCTION_UPDATE_BAR_PDE, sizeof(*rpc));
        if (WARN_ON(IS_ERR_OR_NULL(rpc)))
                return -EIO;

        rpc->info.barType = NV_RPC_UPDATE_PDE_BAR_2;
        rpc->info.entryValue = pdbe;
        rpc->info.entryLevelShift = page_shift;

        return nvkm_gsp_rpc_wr(gsp, rpc, NVKM_GSP_RPC_REPLY_RECV);
}

static void
r535_bar_bar2_fini(struct nvkm_bar *bar)
{
        struct nvkm_vmm *vmm = gf100_bar(bar)->bar[0].vmm;
        struct nvkm_gsp *gsp = bar->subdev.device->gsp;

        bar->flushBAR2 = bar->flushBAR2PhysMode;
        nvkm_done(bar->flushFBZero);

        WARN_ON(r535_bar_bar2_update_pde(gsp, vmm->func->page[0].shift, 0));
}

static void
r535_bar_bar2_init(struct nvkm_bar *bar)
{
        struct nvkm_device *device = bar->subdev.device;
        struct nvkm_vmm *vmm = gf100_bar(bar)->bar[0].vmm;
        struct nvkm_gsp *gsp = device->gsp;
        struct nvkm_memory *pdb = vmm->pd->pt[0]->memory;
        u32 pdb_offset = vmm->pd->pt[0]->base;
        u32 pdbe_lo, pdbe_hi;
        u64 pdbe;

        nvkm_kmap(pdb);
        pdbe_lo = nvkm_ro32(pdb, pdb_offset + 0);
        pdbe_hi = nvkm_ro32(pdb, pdb_offset + 4);
        pdbe = ((u64)pdbe_hi << 32) | pdbe_lo;
        nvkm_done(pdb);

        WARN_ON(r535_bar_bar2_update_pde(gsp, vmm->func->page[0].shift, pdbe));
        vmm->rm.bar2_pdb = gsp->bar.rm_bar2_pdb;

        if (!bar->flushFBZero) {
                struct nvkm_memory *fbZero;
                int ret;

                ret = nvkm_ram_wrap(device, 0, 0x1000, &fbZero);
                if (ret == 0) {
                        ret = nvkm_memory_kmap(fbZero, &bar->flushFBZero);
                        nvkm_memory_unref(&fbZero);
                }
                WARN_ON(ret);
        }

        bar->bar2 = true;
        bar->flushBAR2 = nvkm_kmap(bar->flushFBZero);
        WARN_ON(!bar->flushBAR2);
}

static void
r535_bar_bar1_wait(struct nvkm_bar *base)
{
}

static void
r535_bar_bar1_fini(struct nvkm_bar *base)
{
}

static void
r535_bar_bar1_init(struct nvkm_bar *bar)
{
        struct nvkm_device *device = bar->subdev.device;
        struct nvkm_gsp *gsp = device->gsp;
        struct nvkm_vmm *vmm = gf100_bar(bar)->bar[1].vmm;
        struct nvkm_memory *pd3;
        int ret;

        ret = nvkm_ram_wrap(device, gsp->bar.rm_bar1_pdb, 0x1000, &pd3);
        if (WARN_ON(ret))
                return;

        nvkm_memory_unref(&vmm->pd->pt[0]->memory);

        ret = nvkm_memory_kmap(pd3, &vmm->pd->pt[0]->memory);
        nvkm_memory_unref(&pd3);
        if (WARN_ON(ret))
                return;

        vmm->pd->pt[0]->addr = nvkm_memory_addr(vmm->pd->pt[0]->memory);
}

static void *
r535_bar_dtor(struct nvkm_bar *bar)
{
        void *data = gf100_bar_dtor(bar);

        nvkm_memory_unref(&bar->flushFBZero);

        if (bar->flushBAR2PhysMode)
                iounmap(bar->flushBAR2PhysMode);

        kfree(bar->func);
        return data;
}

int
r535_bar_new_(const struct nvkm_bar_func *hw, struct nvkm_device *device,
              enum nvkm_subdev_type type, int inst, struct nvkm_bar **pbar)
{
        struct nvkm_bar_func *rm;
        struct nvkm_bar *bar;
        int ret;

        if (!(rm = kzalloc_obj(*rm)))
                return -ENOMEM;

        rm->dtor = r535_bar_dtor;
        rm->oneinit = hw->oneinit;
        rm->bar1.init = r535_bar_bar1_init;
        rm->bar1.fini = r535_bar_bar1_fini;
        rm->bar1.wait = r535_bar_bar1_wait;
        rm->bar1.vmm = hw->bar1.vmm;
        rm->bar2.init = r535_bar_bar2_init;
        rm->bar2.fini = r535_bar_bar2_fini;
        rm->bar2.wait = r535_bar_bar2_wait;
        rm->bar2.vmm = hw->bar2.vmm;
        rm->flush = r535_bar_flush;

        ret = gf100_bar_new_(rm, device, type, inst, &bar);
        if (ret) {
                kfree(rm);
                return ret;
        }
        *pbar = bar;

        bar->flushBAR2PhysMode = ioremap(device->func->resource_addr(device, NVKM_BAR2_INST), PAGE_SIZE);
        if (!bar->flushBAR2PhysMode)
                return -ENOMEM;

        bar->flushBAR2 = bar->flushBAR2PhysMode;

        gf100_bar(*pbar)->bar2_halve = true;
        return 0;
}