linux/drivers/gpu/drm/xe/xe_vram.c

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2021-2024 Intel Corporation
 */

#include <linux/pci.h>

#include <drm/drm_managed.h>
#include <drm/drm_print.h>

#include "regs/xe_bars.h"
#include "regs/xe_gt_regs.h"
#include "regs/xe_regs.h"
#include "xe_assert.h"
#include "xe_device.h"
#include "xe_force_wake.h"
#include "xe_gt_mcr.h"
#include "xe_gt_sriov_vf.h"
#include "xe_mmio.h"
#include "xe_module.h"
#include "xe_sriov.h"
#include "xe_vram.h"

#define BAR_SIZE_SHIFT …

static void
_resize_bar(struct xe_device *xe, int resno, resource_size_t size)
{ … }

/*
 * if force_vram_bar_size is set, attempt to set to the requested size
 * else set to maximum possible size
 */
static void resize_vram_bar(struct xe_device *xe)
{ … }

static bool resource_is_valid(struct pci_dev *pdev, int bar)
{ … }

static int determine_lmem_bar_size(struct xe_device *xe)
{ … }

static inline u64 get_flat_ccs_offset(struct xe_gt *gt, u64 tile_size)
{ … }

/*
 * tile_vram_size() - Collect vram size and offset information
 * @tile: tile to get info for
 * @vram_size: available vram (size - device reserved portions)
 * @tile_size: actual vram size
 * @tile_offset: physical start point in the vram address space
 *
 * There are 4 places for size information:
 * - io size (from pci_resource_len of LMEM bar) (only used for small bar and DG1)
 * - TILEx size (actual vram size)
 * - GSMBASE offset (TILEx - "stolen")
 * - CSSBASE offset (TILEx - CSS space necessary)
 *
 * CSSBASE is always a lower/smaller offset then GSMBASE.
 *
 * The actual available size of memory is to the CCS or GSM base.
 * NOTE: multi-tile bases will include the tile offset.
 *
 */
static int tile_vram_size(struct xe_tile *tile, u64 *vram_size,
			  u64 *tile_size, u64 *tile_offset)
{ … }

static void vram_fini(void *arg)
{ … }

/**
 * xe_vram_probe() - Probe VRAM configuration
 * @xe: the &xe_device
 *
 * Collect VRAM size and offset information for all tiles.
 *
 * Return: 0 on success, error code on failure
 */
int xe_vram_probe(struct xe_device *xe)
{ … }