drivers/gpu/drm/nouveau/nvkm/subdev/pmu/memx.c

// SPDX-License-Identifier: GPL-2.0
#ifndef __NVKM_PMU_MEMX_H__
#define __NVKM_PMU_MEMX_H__
#include "priv.h"

struct nvkm_memx {
	struct nvkm_pmu *pmu;
	u32 base;
	u32 size;
	struct {
		u32 mthd;
		u32 size;
		u32 data[64];
	} c;
};

static void
memx_out(struct nvkm_memx *memx)
{
	struct nvkm_device *device = memx->pmu->subdev.device;
	int i;

	if (memx->c.mthd) {
		nvkm_wr32(device, 0x10a1c4, (memx->c.size << 16) | memx->c.mthd);
		for (i = 0; i < memx->c.size; i++)
			nvkm_wr32(device, 0x10a1c4, memx->c.data[i]);
		memx->c.mthd = 0;
		memx->c.size = 0;
	}
}

static void
memx_cmd(struct nvkm_memx *memx, u32 mthd, u32 size, u32 data[])
{
	if ((memx->c.size + size >= ARRAY_SIZE(memx->c.data)) ||
	    (memx->c.mthd && memx->c.mthd != mthd))
		memx_out(memx);
	memcpy(&memx->c.data[memx->c.size], data, size * sizeof(data[0]));
	memx->c.size += size;
	memx->c.mthd  = mthd;
}

int
nvkm_memx_init(struct nvkm_pmu *pmu, struct nvkm_memx **pmemx)
{
	struct nvkm_device *device = pmu->subdev.device;
	struct nvkm_memx *memx;
	u32 reply[2];
	int ret;

	ret = nvkm_pmu_send(pmu, reply, PROC_MEMX, MEMX_MSG_INFO,
			    MEMX_INFO_DATA, 0);
	if (ret)
		return ret;

	memx = *pmemx = kzalloc(sizeof(*memx), GFP_KERNEL);
	if (!memx)
		return -ENOMEM;
	memx->pmu = pmu;
	memx->base = reply[0];
	memx->size = reply[1];

	/* acquire data segment access */
	do {
		nvkm_wr32(device, 0x10a580, 0x00000003);
	} while (nvkm_rd32(device, 0x10a580) != 0x00000003);
	nvkm_wr32(device, 0x10a1c0, 0x01000000 | memx->base);
	return 0;
}

int
nvkm_memx_fini(struct nvkm_memx **pmemx, bool exec)
{
	struct nvkm_memx *memx = *pmemx;
	struct nvkm_pmu *pmu = memx->pmu;
	struct nvkm_subdev *subdev = &pmu->subdev;
	struct nvkm_device *device = subdev->device;
	u32 finish, reply[2];

	/* flush the cache... */
	memx_out(memx);

	/* release data segment access */
	finish = nvkm_rd32(device, 0x10a1c0) & 0x00ffffff;
	nvkm_wr32(device, 0x10a580, 0x00000000);

	/* call MEMX process to execute the script, and wait for reply */
	if (exec) {
		nvkm_pmu_send(pmu, reply, PROC_MEMX, MEMX_MSG_EXEC,
			      memx->base, finish);
	}

	nvkm_debug(subdev, "Exec took %uns, PMU_IN %08x\n",
		   reply[0], reply[1]);
	kfree(memx);
	return 0;
}

void
nvkm_memx_wr32(struct nvkm_memx *memx, u32 addr, u32 data)
{
	nvkm_debug(&memx->pmu->subdev, "R[%06x] = %08x\n", addr, data);
	memx_cmd(memx, MEMX_WR32, 2, (u32[]){ addr, data });
}

void
nvkm_memx_wait(struct nvkm_memx *memx,
		  u32 addr, u32 mask, u32 data, u32 nsec)
{
	nvkm_debug(&memx->pmu->subdev, "R[%06x] & %08x == %08x, %d us\n",
		   addr, mask, data, nsec);
	memx_cmd(memx, MEMX_WAIT, 4, (u32[]){ addr, mask, data, nsec });
	memx_out(memx); /* fuc can't handle multiple */
}

void
nvkm_memx_nsec(struct nvkm_memx *memx, u32 nsec)
{
	nvkm_debug(&memx->pmu->subdev, "    DELAY = %d ns\n", nsec);
	memx_cmd(memx, MEMX_DELAY, 1, (u32[]){ nsec });
	memx_out(memx); /* fuc can't handle multiple */
}

void
nvkm_memx_wait_vblank(struct nvkm_memx *memx)
{
	struct nvkm_subdev *subdev = &memx->pmu->subdev;
	struct nvkm_device *device = subdev->device;
	u32 heads, x, y, px = 0;
	int i, head_sync;

	if (device->chipset < 0xd0) {
		heads = nvkm_rd32(device, 0x610050);
		for (i = 0; i < 2; i++) {
			/* Heuristic: sync to head with biggest resolution */
			if (heads & (2 << (i << 3))) {
				x = nvkm_rd32(device, 0x610b40 + (0x540 * i));
				y = (x & 0xffff0000) >> 16;
				x &= 0x0000ffff;
				if ((x * y) > px) {
					px = (x * y);
					head_sync = i;
				}
			}
		}
	}

	if (px == 0) {
		nvkm_debug(subdev, "WAIT VBLANK !NO ACTIVE HEAD\n");
		return;
	}

	nvkm_debug(subdev, "WAIT VBLANK HEAD%d\n", head_sync);
	memx_cmd(memx, MEMX_VBLANK, 1, (u32[]){ head_sync });
	memx_out(memx); /* fuc can't handle multiple */
}

void
nvkm_memx_train(struct nvkm_memx *memx)
{
	nvkm_debug(&memx->pmu->subdev, "   MEM TRAIN\n");
	memx_cmd(memx, MEMX_TRAIN, 0, NULL);
}

int
nvkm_memx_train_result(struct nvkm_pmu *pmu, u32 *res, int rsize)
{
	struct nvkm_device *device = pmu->subdev.device;
	u32 reply[2], base, size, i;
	int ret;

	ret = nvkm_pmu_send(pmu, reply, PROC_MEMX, MEMX_MSG_INFO,
			    MEMX_INFO_TRAIN, 0);
	if (ret)
		return ret;

	base = reply[0];
	size = reply[1] >> 2;
	if (size > rsize)
		return -ENOMEM;

	/* read the packet */
	nvkm_wr32(device, 0x10a1c0, 0x02000000 | base);

	for (i = 0; i < size; i++)
		res[i] = nvkm_rd32(device, 0x10a1c4);

	return 0;
}

void
nvkm_memx_block(struct nvkm_memx *memx)
{
	nvkm_debug(&memx->pmu->subdev, "   HOST BLOCKED\n");
	memx_cmd(memx, MEMX_ENTER, 0, NULL);
}

void
nvkm_memx_unblock(struct nvkm_memx *memx)
{
	nvkm_debug(&memx->pmu->subdev, "   HOST UNBLOCKED\n");
	memx_cmd(memx, MEMX_LEAVE, 0, NULL);
}
#endif