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// SPDX-License-Identifier: MIT
/*
* Copyright © 2014-2019 Intel Corporation
*
* Authors:
* Vinit Azad <vinit.azad@intel.com>
* Ben Widawsky <ben@bwidawsk.net>
* Dave Gordon <david.s.gordon@intel.com>
* Alex Dai <yu.dai@intel.com>
*/
#include "gt/intel_gt.h"
#include "intel_guc_fw.h"
#include "i915_drv.h"
/**
* intel_guc_fw_init_early() - initializes GuC firmware struct
* @guc: intel_guc struct
*
* On platforms with GuC selects firmware for uploading
*/
void intel_guc_fw_init_early(struct intel_guc *guc)
{
struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
intel_uc_fw_init_early(&guc->fw, INTEL_UC_FW_TYPE_GUC, HAS_GT_UC(i915),
INTEL_INFO(i915)->platform, INTEL_REVID(i915));
}
static void guc_prepare_xfer(struct intel_uncore *uncore)
{
u32 shim_flags = GUC_DISABLE_SRAM_INIT_TO_ZEROES |
GUC_ENABLE_READ_CACHE_LOGIC |
GUC_ENABLE_MIA_CACHING |
GUC_ENABLE_READ_CACHE_FOR_SRAM_DATA |
GUC_ENABLE_READ_CACHE_FOR_WOPCM_DATA |
GUC_ENABLE_MIA_CLOCK_GATING;
/* Must program this register before loading the ucode with DMA */
intel_uncore_write(uncore, GUC_SHIM_CONTROL, shim_flags);
if (IS_GEN9_LP(uncore->i915))
intel_uncore_write(uncore, GEN9LP_GT_PM_CONFIG, GT_DOORBELL_ENABLE);
else
intel_uncore_write(uncore, GEN9_GT_PM_CONFIG, GT_DOORBELL_ENABLE);
if (IS_GEN(uncore->i915, 9)) {
/* DOP Clock Gating Enable for GuC clocks */
intel_uncore_rmw(uncore, GEN7_MISCCPCTL,
0, GEN8_DOP_CLOCK_GATE_GUC_ENABLE);
/* allows for 5us (in 10ns units) before GT can go to RC6 */
intel_uncore_write(uncore, GUC_ARAT_C6DIS, 0x1FF);
}
}
/* Copy RSA signature from the fw image to HW for verification */
static void guc_xfer_rsa(struct intel_uc_fw *guc_fw,
struct intel_uncore *uncore)
{
u32 rsa[UOS_RSA_SCRATCH_COUNT];
size_t copied;
int i;
copied = intel_uc_fw_copy_rsa(guc_fw, rsa, sizeof(rsa));
GEM_BUG_ON(copied < sizeof(rsa));
for (i = 0; i < UOS_RSA_SCRATCH_COUNT; i++)
intel_uncore_write(uncore, UOS_RSA_SCRATCH(i), rsa[i]);
}
/*
* Read the GuC status register (GUC_STATUS) and store it in the
* specified location; then return a boolean indicating whether
* the value matches either of two values representing completion
* of the GuC boot process.
*
* This is used for polling the GuC status in a wait_for()
* loop below.
*/
static inline bool guc_ready(struct intel_uncore *uncore, u32 *status)
{
u32 val = intel_uncore_read(uncore, GUC_STATUS);
u32 uk_val = val & GS_UKERNEL_MASK;
*status = val;
return (uk_val == GS_UKERNEL_READY) ||
((val & GS_MIA_CORE_STATE) && (uk_val == GS_UKERNEL_LAPIC_DONE));
}
static int guc_wait_ucode(struct intel_uncore *uncore)
{
u32 status;
int ret;
/*
* Wait for the GuC to start up.
* NB: Docs recommend not using the interrupt for completion.
* Measurements indicate this should take no more than 20ms, so a
* timeout here indicates that the GuC has failed and is unusable.
* (Higher levels of the driver may decide to reset the GuC and
* attempt the ucode load again if this happens.)
*/
ret = wait_for(guc_ready(uncore, &status), 100);
DRM_DEBUG_DRIVER("GuC status %#x\n", status);
if ((status & GS_BOOTROM_MASK) == GS_BOOTROM_RSA_FAILED) {
DRM_ERROR("GuC firmware signature verification failed\n");
ret = -ENOEXEC;
}
if ((status & GS_UKERNEL_MASK) == GS_UKERNEL_EXCEPTION) {
DRM_ERROR("GuC firmware exception. EIP: %#x\n",
intel_uncore_read(uncore, SOFT_SCRATCH(13)));
ret = -ENXIO;
}
return ret;
}
/**
* intel_guc_fw_upload() - load GuC uCode to device
* @guc: intel_guc structure
*
* Called from intel_uc_init_hw() during driver load, resume from sleep and
* after a GPU reset.
*
* The firmware image should have already been fetched into memory, so only
* check that fetch succeeded, and then transfer the image to the h/w.
*
* Return: non-zero code on error
*/
int intel_guc_fw_upload(struct intel_guc *guc)
{
struct intel_gt *gt = guc_to_gt(guc);
struct intel_uncore *uncore = gt->uncore;
int ret;
guc_prepare_xfer(uncore);
/*
* Note that GuC needs the CSS header plus uKernel code to be copied
* by the DMA engine in one operation, whereas the RSA signature is
* loaded via MMIO.
*/
guc_xfer_rsa(&guc->fw, uncore);
/*
* Current uCode expects the code to be loaded at 8k; locations below
* this are used for the stack.
*/
ret = intel_uc_fw_upload(&guc->fw, 0x2000, UOS_MOVE);
if (ret)
goto out;
ret = guc_wait_ucode(uncore);
if (ret)
goto out;
intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_RUNNING);
return 0;
out:
intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_FAIL);
return ret;
}
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