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2515d2b9ab
There are two registers filled in when reading data from pcode besides the mailbox itself. Currently, we allow a NULL value for the second of these two (data1) and assume the first is defined. However, many of the routines that are calling this function assume that pcode will ignore the value being passed in and so leave that first value (data0) defined but uninitialized. To be safe, make sure this value is always initialized to something (0 generally) in the event pcode behavior changes and starts using this value. v2: Fix sob/author Signed-off-by: Stuart Summers <stuart.summers@intel.com> Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com> Link: https://lore.kernel.org/r/20250819201054.393220-1-stuart.summers@intel.com Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2024 Intel Corporation
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*/
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#include <linux/sysfs.h>
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#include <drm/drm_managed.h>
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#include "xe_gt_types.h"
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#include "xe_pcode.h"
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#include "xe_pcode_api.h"
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#include "xe_tile.h"
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#include "xe_tile_sysfs.h"
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#include "xe_vram_freq.h"
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/**
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* DOC: Xe VRAM freq
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*
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* Provides sysfs entries for vram frequency in tile
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*
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* device/tile#/memory/freq0/max_freq - This is maximum frequency. This value is read-only as it
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* is the fixed fuse point P0. It is not the system
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* configuration.
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* device/tile#/memory/freq0/min_freq - This is minimum frequency. This value is read-only as it
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* is the fixed fuse point PN. It is not the system
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* configuration.
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*/
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static struct xe_tile *dev_to_tile(struct device *dev)
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{
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return kobj_to_tile(dev->kobj.parent);
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}
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static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct xe_tile *tile = dev_to_tile(dev);
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u32 val = 0, mbox;
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int err;
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mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
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| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_P0)
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| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
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err = xe_pcode_read(tile, mbox, &val, NULL);
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if (err)
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return err;
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/* data_out - Fused P0 for domain ID in units of 50 MHz */
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val *= 50;
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return sysfs_emit(buf, "%u\n", val);
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}
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static DEVICE_ATTR_RO(max_freq);
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static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct xe_tile *tile = dev_to_tile(dev);
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u32 val = 0, mbox;
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int err;
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mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
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| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_PN)
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| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
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err = xe_pcode_read(tile, mbox, &val, NULL);
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if (err)
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return err;
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/* data_out - Fused Pn for domain ID in units of 50 MHz */
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val *= 50;
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return sysfs_emit(buf, "%u\n", val);
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}
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static DEVICE_ATTR_RO(min_freq);
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static struct attribute *freq_attrs[] = {
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&dev_attr_max_freq.attr,
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&dev_attr_min_freq.attr,
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NULL
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};
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static const struct attribute_group freq_group_attrs = {
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.name = "freq0",
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.attrs = freq_attrs,
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};
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static void vram_freq_sysfs_fini(void *arg)
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{
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struct kobject *kobj = arg;
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sysfs_remove_group(kobj, &freq_group_attrs);
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kobject_put(kobj);
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}
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/**
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* xe_vram_freq_sysfs_init - Initialize vram frequency sysfs component
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* @tile: Xe Tile object
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*
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* It needs to be initialized after the main tile component is ready
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*
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* Returns: 0 on success, negative error code on error.
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*/
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int xe_vram_freq_sysfs_init(struct xe_tile *tile)
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{
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struct xe_device *xe = tile_to_xe(tile);
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struct kobject *kobj;
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int err;
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if (xe->info.platform != XE_PVC)
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return 0;
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kobj = kobject_create_and_add("memory", tile->sysfs);
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if (!kobj)
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return -ENOMEM;
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err = sysfs_create_group(kobj, &freq_group_attrs);
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if (err) {
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kobject_put(kobj);
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return err;
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}
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return devm_add_action_or_reset(xe->drm.dev, vram_freq_sysfs_fini, kobj);
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}
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