linux/drivers/gpu/drm/i915/intel_uc.c
Sagar Arun Kamble 9a2cbf2d7b drm/i915/huc: Reorganize HuC authentication
Prepared intel_auth_huc to separate HuC specific functionality
from GuC send action. Created new header intel_huc.h to group
HuC specific declarations.

v2: Changed argument preparation for AUTHENTICATE_HUC.
s/intel_auth_huc/intel_huc_auth. Deferred creation of intel_huc.h
to later patch.

v3: Rebase as intel_guc.h is removed. Added param description to
intel_huc_auth. (Michal)

v4: Rebase as intel_guc.h is added again. :)

v5: Rebase w.r.t removal of GuC code restructuring.

v6-v7: Rebase.

v8: Tagged subject as drm/i915/huc. (Michal Wajdeczko)
Added kernel-doc description to intel_huc_auth and intel_guc_auth_huc.
s/dev_priv/i915 and removed unnecessary variable offset. (Joonas)

v9: Rebase. Had conflict with i915_modparams change.

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1506410236-17926-1-git-send-email-sagar.a.kamble@intel.com
2017-09-26 12:08:03 +03:00

562 lines
15 KiB
C

/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include "i915_drv.h"
#include "intel_uc.h"
#include <linux/firmware.h>
/* Cleans up uC firmware by releasing the firmware GEM obj.
*/
static void __intel_uc_fw_fini(struct intel_uc_fw *uc_fw)
{
struct drm_i915_gem_object *obj;
obj = fetch_and_zero(&uc_fw->obj);
if (obj)
i915_gem_object_put(obj);
uc_fw->fetch_status = INTEL_UC_FIRMWARE_NONE;
}
/* Reset GuC providing us with fresh state for both GuC and HuC.
*/
static int __intel_uc_reset_hw(struct drm_i915_private *dev_priv)
{
int ret;
u32 guc_status;
ret = intel_guc_reset(dev_priv);
if (ret) {
DRM_ERROR("GuC reset failed, ret = %d\n", ret);
return ret;
}
guc_status = I915_READ(GUC_STATUS);
WARN(!(guc_status & GS_MIA_IN_RESET),
"GuC status: 0x%x, MIA core expected to be in reset\n",
guc_status);
return ret;
}
void intel_uc_sanitize_options(struct drm_i915_private *dev_priv)
{
if (!HAS_GUC(dev_priv)) {
if (i915_modparams.enable_guc_loading > 0 ||
i915_modparams.enable_guc_submission > 0)
DRM_INFO("Ignoring GuC options, no hardware\n");
i915_modparams.enable_guc_loading = 0;
i915_modparams.enable_guc_submission = 0;
return;
}
/* A negative value means "use platform default" */
if (i915_modparams.enable_guc_loading < 0)
i915_modparams.enable_guc_loading = HAS_GUC_UCODE(dev_priv);
/* Verify firmware version */
if (i915_modparams.enable_guc_loading) {
if (HAS_HUC_UCODE(dev_priv))
intel_huc_select_fw(&dev_priv->huc);
if (intel_guc_select_fw(&dev_priv->guc))
i915_modparams.enable_guc_loading = 0;
}
/* Can't enable guc submission without guc loaded */
if (!i915_modparams.enable_guc_loading)
i915_modparams.enable_guc_submission = 0;
/* A negative value means "use platform default" */
if (i915_modparams.enable_guc_submission < 0)
i915_modparams.enable_guc_submission = HAS_GUC_SCHED(dev_priv);
}
static void gen8_guc_raise_irq(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
I915_WRITE(GUC_SEND_INTERRUPT, GUC_SEND_TRIGGER);
}
void intel_uc_init_early(struct drm_i915_private *dev_priv)
{
struct intel_guc *guc = &dev_priv->guc;
intel_guc_ct_init_early(&guc->ct);
mutex_init(&guc->send_mutex);
guc->send = intel_guc_send_nop;
guc->notify = gen8_guc_raise_irq;
}
static void fetch_uc_fw(struct drm_i915_private *dev_priv,
struct intel_uc_fw *uc_fw)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
struct drm_i915_gem_object *obj;
const struct firmware *fw = NULL;
struct uc_css_header *css;
size_t size;
int err;
if (!uc_fw->path)
return;
uc_fw->fetch_status = INTEL_UC_FIRMWARE_PENDING;
DRM_DEBUG_DRIVER("before requesting firmware: uC fw fetch status %s\n",
intel_uc_fw_status_repr(uc_fw->fetch_status));
err = request_firmware(&fw, uc_fw->path, &pdev->dev);
if (err)
goto fail;
if (!fw)
goto fail;
DRM_DEBUG_DRIVER("fetch uC fw from %s succeeded, fw %p\n",
uc_fw->path, fw);
/* Check the size of the blob before examining buffer contents */
if (fw->size < sizeof(struct uc_css_header)) {
DRM_NOTE("Firmware header is missing\n");
goto fail;
}
css = (struct uc_css_header *)fw->data;
/* Firmware bits always start from header */
uc_fw->header_offset = 0;
uc_fw->header_size = (css->header_size_dw - css->modulus_size_dw -
css->key_size_dw - css->exponent_size_dw) * sizeof(u32);
if (uc_fw->header_size != sizeof(struct uc_css_header)) {
DRM_NOTE("CSS header definition mismatch\n");
goto fail;
}
/* then, uCode */
uc_fw->ucode_offset = uc_fw->header_offset + uc_fw->header_size;
uc_fw->ucode_size = (css->size_dw - css->header_size_dw) * sizeof(u32);
/* now RSA */
if (css->key_size_dw != UOS_RSA_SCRATCH_MAX_COUNT) {
DRM_NOTE("RSA key size is bad\n");
goto fail;
}
uc_fw->rsa_offset = uc_fw->ucode_offset + uc_fw->ucode_size;
uc_fw->rsa_size = css->key_size_dw * sizeof(u32);
/* At least, it should have header, uCode and RSA. Size of all three. */
size = uc_fw->header_size + uc_fw->ucode_size + uc_fw->rsa_size;
if (fw->size < size) {
DRM_NOTE("Missing firmware components\n");
goto fail;
}
/*
* The GuC firmware image has the version number embedded at a
* well-known offset within the firmware blob; note that major / minor
* version are TWO bytes each (i.e. u16), although all pointers and
* offsets are defined in terms of bytes (u8).
*/
switch (uc_fw->type) {
case INTEL_UC_FW_TYPE_GUC:
/* Header and uCode will be loaded to WOPCM. Size of the two. */
size = uc_fw->header_size + uc_fw->ucode_size;
/* Top 32k of WOPCM is reserved (8K stack + 24k RC6 context). */
if (size > intel_guc_wopcm_size(dev_priv)) {
DRM_ERROR("Firmware is too large to fit in WOPCM\n");
goto fail;
}
uc_fw->major_ver_found = css->guc.sw_version >> 16;
uc_fw->minor_ver_found = css->guc.sw_version & 0xFFFF;
break;
case INTEL_UC_FW_TYPE_HUC:
uc_fw->major_ver_found = css->huc.sw_version >> 16;
uc_fw->minor_ver_found = css->huc.sw_version & 0xFFFF;
break;
default:
DRM_ERROR("Unknown firmware type %d\n", uc_fw->type);
err = -ENOEXEC;
goto fail;
}
if (uc_fw->major_ver_wanted == 0 && uc_fw->minor_ver_wanted == 0) {
DRM_NOTE("Skipping %s firmware version check\n",
intel_uc_fw_type_repr(uc_fw->type));
} else if (uc_fw->major_ver_found != uc_fw->major_ver_wanted ||
uc_fw->minor_ver_found < uc_fw->minor_ver_wanted) {
DRM_NOTE("%s firmware version %d.%d, required %d.%d\n",
intel_uc_fw_type_repr(uc_fw->type),
uc_fw->major_ver_found, uc_fw->minor_ver_found,
uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted);
err = -ENOEXEC;
goto fail;
}
DRM_DEBUG_DRIVER("firmware version %d.%d OK (minimum %d.%d)\n",
uc_fw->major_ver_found, uc_fw->minor_ver_found,
uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted);
obj = i915_gem_object_create_from_data(dev_priv, fw->data, fw->size);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto fail;
}
uc_fw->obj = obj;
uc_fw->size = fw->size;
DRM_DEBUG_DRIVER("uC fw fetch status SUCCESS, obj %p\n",
uc_fw->obj);
release_firmware(fw);
uc_fw->fetch_status = INTEL_UC_FIRMWARE_SUCCESS;
return;
fail:
DRM_WARN("Failed to fetch valid uC firmware from %s (error %d)\n",
uc_fw->path, err);
DRM_DEBUG_DRIVER("uC fw fetch status FAIL; err %d, fw %p, obj %p\n",
err, fw, uc_fw->obj);
release_firmware(fw); /* OK even if fw is NULL */
uc_fw->fetch_status = INTEL_UC_FIRMWARE_FAIL;
}
void intel_uc_init_fw(struct drm_i915_private *dev_priv)
{
fetch_uc_fw(dev_priv, &dev_priv->huc.fw);
fetch_uc_fw(dev_priv, &dev_priv->guc.fw);
}
void intel_uc_fini_fw(struct drm_i915_private *dev_priv)
{
__intel_uc_fw_fini(&dev_priv->guc.fw);
__intel_uc_fw_fini(&dev_priv->huc.fw);
}
static inline i915_reg_t guc_send_reg(struct intel_guc *guc, u32 i)
{
GEM_BUG_ON(!guc->send_regs.base);
GEM_BUG_ON(!guc->send_regs.count);
GEM_BUG_ON(i >= guc->send_regs.count);
return _MMIO(guc->send_regs.base + 4 * i);
}
static void guc_init_send_regs(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
enum forcewake_domains fw_domains = 0;
unsigned int i;
guc->send_regs.base = i915_mmio_reg_offset(SOFT_SCRATCH(0));
guc->send_regs.count = SOFT_SCRATCH_COUNT - 1;
for (i = 0; i < guc->send_regs.count; i++) {
fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
guc_send_reg(guc, i),
FW_REG_READ | FW_REG_WRITE);
}
guc->send_regs.fw_domains = fw_domains;
}
static void guc_capture_load_err_log(struct intel_guc *guc)
{
if (!guc->log.vma || i915_modparams.guc_log_level < 0)
return;
if (!guc->load_err_log)
guc->load_err_log = i915_gem_object_get(guc->log.vma->obj);
return;
}
static void guc_free_load_err_log(struct intel_guc *guc)
{
if (guc->load_err_log)
i915_gem_object_put(guc->load_err_log);
}
static int guc_enable_communication(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
guc_init_send_regs(guc);
if (HAS_GUC_CT(dev_priv))
return intel_guc_enable_ct(guc);
guc->send = intel_guc_send_mmio;
return 0;
}
static void guc_disable_communication(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
if (HAS_GUC_CT(dev_priv))
intel_guc_disable_ct(guc);
guc->send = intel_guc_send_nop;
}
/**
* intel_guc_auth_huc() - Send action to GuC to authenticate HuC ucode
* @guc: intel_guc structure
* @rsa_offset: rsa offset w.r.t ggtt base of huc vma
*
* Triggers a HuC firmware authentication request to the GuC via intel_guc_send
* INTEL_GUC_ACTION_AUTHENTICATE_HUC interface. This function is invoked by
* intel_huc_auth().
*
* Return: non-zero code on error
*/
int intel_guc_auth_huc(struct intel_guc *guc, u32 rsa_offset)
{
u32 action[] = {
INTEL_GUC_ACTION_AUTHENTICATE_HUC,
rsa_offset
};
return intel_guc_send(guc, action, ARRAY_SIZE(action));
}
int intel_uc_init_hw(struct drm_i915_private *dev_priv)
{
struct intel_guc *guc = &dev_priv->guc;
int ret, attempts;
if (!i915_modparams.enable_guc_loading)
return 0;
guc_disable_communication(guc);
gen9_reset_guc_interrupts(dev_priv);
/* We need to notify the guc whenever we change the GGTT */
i915_ggtt_enable_guc(dev_priv);
if (i915_modparams.enable_guc_submission) {
/*
* This is stuff we need to have available at fw load time
* if we are planning to enable submission later
*/
ret = i915_guc_submission_init(dev_priv);
if (ret)
goto err_guc;
}
/* init WOPCM */
I915_WRITE(GUC_WOPCM_SIZE, intel_guc_wopcm_size(dev_priv));
I915_WRITE(DMA_GUC_WOPCM_OFFSET,
GUC_WOPCM_OFFSET_VALUE | HUC_LOADING_AGENT_GUC);
/* WaEnableuKernelHeaderValidFix:skl */
/* WaEnableGuCBootHashCheckNotSet:skl,bxt,kbl */
if (IS_GEN9(dev_priv))
attempts = 3;
else
attempts = 1;
while (attempts--) {
/*
* Always reset the GuC just before (re)loading, so
* that the state and timing are fairly predictable
*/
ret = __intel_uc_reset_hw(dev_priv);
if (ret)
goto err_submission;
intel_huc_init_hw(&dev_priv->huc);
ret = intel_guc_init_hw(&dev_priv->guc);
if (ret == 0 || ret != -EAGAIN)
break;
DRM_DEBUG_DRIVER("GuC fw load failed: %d; will reset and "
"retry %d more time(s)\n", ret, attempts);
}
/* Did we succeded or run out of retries? */
if (ret)
goto err_log_capture;
ret = guc_enable_communication(guc);
if (ret)
goto err_log_capture;
intel_huc_auth(&dev_priv->huc);
if (i915_modparams.enable_guc_submission) {
if (i915_modparams.guc_log_level >= 0)
gen9_enable_guc_interrupts(dev_priv);
ret = i915_guc_submission_enable(dev_priv);
if (ret)
goto err_interrupts;
}
return 0;
/*
* We've failed to load the firmware :(
*
* Decide whether to disable GuC submission and fall back to
* execlist mode, and whether to hide the error by returning
* zero or to return -EIO, which the caller will treat as a
* nonfatal error (i.e. it doesn't prevent driver load, but
* marks the GPU as wedged until reset).
*/
err_interrupts:
guc_disable_communication(guc);
gen9_disable_guc_interrupts(dev_priv);
err_log_capture:
guc_capture_load_err_log(guc);
err_submission:
if (i915_modparams.enable_guc_submission)
i915_guc_submission_fini(dev_priv);
err_guc:
i915_ggtt_disable_guc(dev_priv);
DRM_ERROR("GuC init failed\n");
if (i915_modparams.enable_guc_loading > 1 ||
i915_modparams.enable_guc_submission > 1)
ret = -EIO;
else
ret = 0;
if (i915_modparams.enable_guc_submission) {
i915_modparams.enable_guc_submission = 0;
DRM_NOTE("Falling back from GuC submission to execlist mode\n");
}
i915_modparams.enable_guc_loading = 0;
DRM_NOTE("GuC firmware loading disabled\n");
return ret;
}
void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
{
guc_free_load_err_log(&dev_priv->guc);
if (!i915_modparams.enable_guc_loading)
return;
if (i915_modparams.enable_guc_submission)
i915_guc_submission_disable(dev_priv);
guc_disable_communication(&dev_priv->guc);
if (i915_modparams.enable_guc_submission) {
gen9_disable_guc_interrupts(dev_priv);
i915_guc_submission_fini(dev_priv);
}
i915_ggtt_disable_guc(dev_priv);
}
int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len)
{
WARN(1, "Unexpected send: action=%#x\n", *action);
return -ENODEV;
}
/*
* This function implements the MMIO based host to GuC interface.
*/
int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
u32 status;
int i;
int ret;
GEM_BUG_ON(!len);
GEM_BUG_ON(len > guc->send_regs.count);
/* If CT is available, we expect to use MMIO only during init/fini */
GEM_BUG_ON(HAS_GUC_CT(dev_priv) &&
*action != INTEL_GUC_ACTION_REGISTER_COMMAND_TRANSPORT_BUFFER &&
*action != INTEL_GUC_ACTION_DEREGISTER_COMMAND_TRANSPORT_BUFFER);
mutex_lock(&guc->send_mutex);
intel_uncore_forcewake_get(dev_priv, guc->send_regs.fw_domains);
for (i = 0; i < len; i++)
I915_WRITE(guc_send_reg(guc, i), action[i]);
POSTING_READ(guc_send_reg(guc, i - 1));
intel_guc_notify(guc);
/*
* No GuC command should ever take longer than 10ms.
* Fast commands should still complete in 10us.
*/
ret = __intel_wait_for_register_fw(dev_priv,
guc_send_reg(guc, 0),
INTEL_GUC_RECV_MASK,
INTEL_GUC_RECV_MASK,
10, 10, &status);
if (status != INTEL_GUC_STATUS_SUCCESS) {
/*
* Either the GuC explicitly returned an error (which
* we convert to -EIO here) or no response at all was
* received within the timeout limit (-ETIMEDOUT)
*/
if (ret != -ETIMEDOUT)
ret = -EIO;
DRM_WARN("INTEL_GUC_SEND: Action 0x%X failed;"
" ret=%d status=0x%08X response=0x%08X\n",
action[0], ret, status, I915_READ(SOFT_SCRATCH(15)));
}
intel_uncore_forcewake_put(dev_priv, guc->send_regs.fw_domains);
mutex_unlock(&guc->send_mutex);
return ret;
}
int intel_guc_sample_forcewake(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
u32 action[2];
action[0] = INTEL_GUC_ACTION_SAMPLE_FORCEWAKE;
/* WaRsDisableCoarsePowerGating:skl,bxt */
if (!intel_enable_rc6() || NEEDS_WaRsDisableCoarsePowerGating(dev_priv))
action[1] = 0;
else
/* bit 0 and 1 are for Render and Media domain separately */
action[1] = GUC_FORCEWAKE_RENDER | GUC_FORCEWAKE_MEDIA;
return intel_guc_send(guc, action, ARRAY_SIZE(action));
}