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// SPDX-License-Identifier: MIT
/*
* Copyright © 2022 Intel Corporation
*/
#include "gt/intel_engine_pm.h"
#include "gt/intel_gpu_commands.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_print.h"
#include "gt/intel_ring.h"
#include "intel_gsc_fw.h"
#define GSC_FW_STATUS_REG _MMIO(0x116C40)
#define GSC_FW_CURRENT_STATE REG_GENMASK(3, 0)
#define GSC_FW_CURRENT_STATE_RESET 0
#define GSC_FW_INIT_COMPLETE_BIT REG_BIT(9)
static bool gsc_is_in_reset(struct intel_uncore *uncore)
{
u32 fw_status = intel_uncore_read(uncore, GSC_FW_STATUS_REG);
return REG_FIELD_GET(GSC_FW_CURRENT_STATE, fw_status) ==
GSC_FW_CURRENT_STATE_RESET;
}
bool intel_gsc_uc_fw_init_done(struct intel_gsc_uc *gsc)
{
struct intel_uncore *uncore = gsc_uc_to_gt(gsc)->uncore;
u32 fw_status = intel_uncore_read(uncore, GSC_FW_STATUS_REG);
return fw_status & GSC_FW_INIT_COMPLETE_BIT;
}
static int emit_gsc_fw_load(struct i915_request *rq, struct intel_gsc_uc *gsc)
{
u32 offset = i915_ggtt_offset(gsc->local);
u32 *cs;
cs = intel_ring_begin(rq, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = GSC_FW_LOAD;
*cs++ = lower_32_bits(offset);
*cs++ = upper_32_bits(offset);
*cs++ = (gsc->local->size / SZ_4K) | HECI1_FW_LIMIT_VALID;
intel_ring_advance(rq, cs);
return 0;
}
static int gsc_fw_load(struct intel_gsc_uc *gsc)
{
struct intel_context *ce = gsc->ce;
struct i915_request *rq;
int err;
if (!ce)
return -ENODEV;
rq = i915_request_create(ce);
if (IS_ERR(rq))
return PTR_ERR(rq);
if (ce->engine->emit_init_breadcrumb) {
err = ce->engine->emit_init_breadcrumb(rq);
if (err)
goto out_rq;
}
err = emit_gsc_fw_load(rq, gsc);
if (err)
goto out_rq;
err = ce->engine->emit_flush(rq, 0);
out_rq:
i915_request_get(rq);
if (unlikely(err))
i915_request_set_error_once(rq, err);
i915_request_add(rq);
if (!err && i915_request_wait(rq, 0, msecs_to_jiffies(500)) < 0)
err = -ETIME;
i915_request_put(rq);
if (err)
gt_err(gsc_uc_to_gt(gsc), "Request submission for GSC load failed %pe\n",
ERR_PTR(err));
return err;
}
static int gsc_fw_load_prepare(struct intel_gsc_uc *gsc)
{
struct intel_gt *gt = gsc_uc_to_gt(gsc);
struct drm_i915_private *i915 = gt->i915;
struct drm_i915_gem_object *obj;
void *src, *dst;
if (!gsc->local)
return -ENODEV;
obj = gsc->local->obj;
if (obj->base.size < gsc->fw.size)
return -ENOSPC;
dst = i915_gem_object_pin_map_unlocked(obj,
i915_coherent_map_type(i915, obj, true));
if (IS_ERR(dst))
return PTR_ERR(dst);
src = i915_gem_object_pin_map_unlocked(gsc->fw.obj,
i915_coherent_map_type(i915, gsc->fw.obj, true));
if (IS_ERR(src)) {
i915_gem_object_unpin_map(obj);
return PTR_ERR(src);
}
memset(dst, 0, obj->base.size);
memcpy(dst, src, gsc->fw.size);
i915_gem_object_unpin_map(gsc->fw.obj);
i915_gem_object_unpin_map(obj);
return 0;
}
static int gsc_fw_wait(struct intel_gt *gt)
{
return intel_wait_for_register(gt->uncore,
GSC_FW_STATUS_REG,
GSC_FW_INIT_COMPLETE_BIT,
GSC_FW_INIT_COMPLETE_BIT,
500);
}
int intel_gsc_uc_fw_upload(struct intel_gsc_uc *gsc)
{
struct intel_gt *gt = gsc_uc_to_gt(gsc);
struct intel_uc_fw *gsc_fw = &gsc->fw;
int err;
/* check current fw status */
if (intel_gsc_uc_fw_init_done(gsc)) {
if (GEM_WARN_ON(!intel_uc_fw_is_loaded(gsc_fw)))
intel_uc_fw_change_status(gsc_fw, INTEL_UC_FIRMWARE_TRANSFERRED);
return -EEXIST;
}
if (!intel_uc_fw_is_loadable(gsc_fw))
return -ENOEXEC;
/* FW blob is ok, so clean the status */
intel_uc_fw_sanitize(&gsc->fw);
if (!gsc_is_in_reset(gt->uncore))
return -EIO;
err = gsc_fw_load_prepare(gsc);
if (err)
goto fail;
/*
* GSC is only killed by an FLR, so we need to trigger one on unload to
* make sure we stop it. This is because we assign a chunk of memory to
* the GSC as part of the FW load , so we need to make sure it stops
* using it when we release it to the system on driver unload. Note that
* this is not a problem of the unload per-se, because the GSC will not
* touch that memory unless there are requests for it coming from the
* driver; therefore, no accesses will happen while i915 is not loaded,
* but if we re-load the driver then the GSC might wake up and try to
* access that old memory location again.
* Given that an FLR is a very disruptive action (see the FLR function
* for details), we want to do it as the last action before releasing
* the access to the MMIO bar, which means we need to do it as part of
* the primary uncore cleanup.
* An alternative approach to the FLR would be to use a memory location
* that survives driver unload, like e.g. stolen memory, and keep the
* GSC loaded across reloads. However, this requires us to make sure we
* preserve that memory location on unload and then determine and
* reserve its offset on each subsequent load, which is not trivial, so
* it is easier to just kill everything and start fresh.
*/
intel_uncore_set_flr_on_fini(>->i915->uncore);
err = gsc_fw_load(gsc);
if (err)
goto fail;
err = gsc_fw_wait(gt);
if (err)
goto fail;
/* FW is not fully operational until we enable SW proxy */
intel_uc_fw_change_status(gsc_fw, INTEL_UC_FIRMWARE_TRANSFERRED);
gt_info(gt, "Loaded GSC firmware %s\n", gsc_fw->file_selected.path);
return 0;
fail:
return intel_uc_fw_mark_load_failed(gsc_fw, err);
}
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