On 10.06.2021 22:46, John.C.Harrison@xxxxxxxxx wrote:
> From: John Harrison <John.C.Harrison@xxxxxxxxx>
>
> Implement support for fetching the hardware description table from the
> GuC. The call is made twice - once without a destination buffer to
> query the size and then a second time to fill in the buffer.
>
> This patch also adds a header file which lists all the attribute values
> currently defined for the table. This is included for reference as
> these are not currently used by the i915 driver itself.
>
> Note that the table is only available on ADL-P and later platforms.
>
> Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/Makefile | 1 +
> .../gpu/drm/i915/gt/intel_hwconfig_types.h | 102 +++++++++++
> .../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h | 1 +
> .../gpu/drm/i915/gt/uc/abi/guc_errors_abi.h | 4 +
> drivers/gpu/drm/i915/gt/uc/intel_guc.c | 3 +-
> drivers/gpu/drm/i915/gt/uc/intel_guc.h | 2 +
> .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c | 167 ++++++++++++++++++
> .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h | 19 ++
> drivers/gpu/drm/i915/gt/uc/intel_uc.c | 6 +
> 9 files changed, 304 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/i915/gt/intel_hwconfig_types.h
> create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
> create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 2adb6b420c7c..8e957ca7c9f1 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -187,6 +187,7 @@ i915-y += gt/uc/intel_uc.o \
> gt/uc/intel_guc_log.o \
> gt/uc/intel_guc_log_debugfs.o \
> gt/uc/intel_guc_submission.o \
> + gt/uc/intel_guc_hwconfig.o \
> gt/uc/intel_huc.o \
> gt/uc/intel_huc_debugfs.o \
> gt/uc/intel_huc_fw.o
> diff --git a/drivers/gpu/drm/i915/gt/intel_hwconfig_types.h b/drivers/gpu/drm/i915/gt/intel_hwconfig_types.h
> new file mode 100644
> index 000000000000..b09c0f65b93a
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/intel_hwconfig_types.h
> @@ -0,0 +1,102 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2020 Intel Corporation
it's already June'21
> + */
> +
> +#ifndef _INTEL_HWCONFIG_TYPES_H_
> +#define _INTEL_HWCONFIG_TYPES_H_
> +
> +/**
> + * enum intel_hwconfig - Global definition of hwconfig table attributes
> + *
> + * Intel devices provide a KLV (Key/Length/Value) table containing
> + * the static hardware configuration for that platform.
> + * This header defines the current attribute keys for this KLV.
s/header/enum
as this is enum documentation
likely separate DOC: section with explanation of the whole HW KLV
concept could be helpful if plugged into i915 rst
> + */
> +enum intel_hwconfig {
> + INTEL_HWCONFIG_MAX_SLICES_SUPPORTED = 1,
> + INTEL_HWCONFIG_MAX_DUAL_SUBSLICES_SUPPORTED, /* 2 */
putting estimated enum values in comments could be misleading, as if
someone accidentally add some enum in the middle then all values in
comments will be stale
if you really want stable definitions, without risking accidental
breakage, then better to define enums with explicit value, like you did
for the first one:
INTEL_HWCONFIG_MAX_SLICES_SUPPORTED = 1,
INTEL_HWCONFIG_MAX_DUAL_SUBSLICES_SUPPORTED = 2,
INTEL_HWCONFIG_MAX_NUM_EU_PER_DSS = 3,
...
> + INTEL_HWCONFIG_MAX_NUM_EU_PER_DSS, /* 3 */
> + INTEL_HWCONFIG_NUM_PIXEL_PIPES, /* 4 */
> + INTEL_HWCONFIG_DEPRECATED_MAX_NUM_GEOMETRY_PIPES, /* 5 */
> + INTEL_HWCONFIG_DEPRECATED_L3_CACHE_SIZE_IN_KB, /* 6 */
> + INTEL_HWCONFIG_DEPRECATED_L3_BANK_COUNT, /* 7 */
what's the meaning of the 'deprecated' here ?
if not used in ADLP and beyond, then I guess no reason to define them.
just skip these numbers:
INTEL_HWCONFIG_NUM_PIXEL_PIPES = 4,
/* 5-7 not used/reserved/deprecated */
INTEL_HWCONFIG_L3_CACHE_WAYS_SIZE_IN_BYTES = 8,
> + INTEL_HWCONFIG_L3_CACHE_WAYS_SIZE_IN_BYTES, /* 8 */
> + INTEL_HWCONFIG_L3_CACHE_WAYS_PER_SECTOR, /* 9 */
> + INTEL_HWCONFIG_MAX_MEMORY_CHANNELS, /* 10 */
> + INTEL_HWCONFIG_MEMORY_TYPE, /* 11 */
> + INTEL_HWCONFIG_CACHE_TYPES, /* 12 */
> + INTEL_HWCONFIG_LOCAL_MEMORY_PAGE_SIZES_SUPPORTED, /* 13 */
> + INTEL_HWCONFIG_DEPRECATED_SLM_SIZE_IN_KB, /* 14 */
> + INTEL_HWCONFIG_NUM_THREADS_PER_EU, /* 15 */
> + INTEL_HWCONFIG_TOTAL_VS_THREADS, /* 16 */
> + INTEL_HWCONFIG_TOTAL_GS_THREADS, /* 17 */
> + INTEL_HWCONFIG_TOTAL_HS_THREADS, /* 18 */
> + INTEL_HWCONFIG_TOTAL_DS_THREADS, /* 19 */
> + INTEL_HWCONFIG_TOTAL_VS_THREADS_POCS, /* 20 */
> + INTEL_HWCONFIG_TOTAL_PS_THREADS, /* 21 */
> + INTEL_HWCONFIG_DEPRECATED_MAX_FILL_RATE, /* 22 */
> + INTEL_HWCONFIG_MAX_RCS, /* 23 */
> + INTEL_HWCONFIG_MAX_CCS, /* 24 */
> + INTEL_HWCONFIG_MAX_VCS, /* 25 */
> + INTEL_HWCONFIG_MAX_VECS, /* 26 */
> + INTEL_HWCONFIG_MAX_COPY_CS, /* 27 */
> + INTEL_HWCONFIG_DEPRECATED_URB_SIZE_IN_KB, /* 28 */
> + INTEL_HWCONFIG_MIN_VS_URB_ENTRIES, /* 29 */
> + INTEL_HWCONFIG_MAX_VS_URB_ENTRIES, /* 30 */
> + INTEL_HWCONFIG_MIN_PCS_URB_ENTRIES, /* 31 */
> + INTEL_HWCONFIG_MAX_PCS_URB_ENTRIES, /* 32 */
> + INTEL_HWCONFIG_MIN_HS_URB_ENTRIES, /* 33 */
> + INTEL_HWCONFIG_MAX_HS_URB_ENTRIES, /* 34 */
> + INTEL_HWCONFIG_MIN_GS_URB_ENTRIES, /* 35 */
> + INTEL_HWCONFIG_MAX_GS_URB_ENTRIES, /* 36 */
> + INTEL_HWCONFIG_MIN_DS_URB_ENTRIES, /* 37 */
> + INTEL_HWCONFIG_MAX_DS_URB_ENTRIES, /* 38 */
> + INTEL_HWCONFIG_PUSH_CONSTANT_URB_RESERVED_SIZE, /* 39 */
> + INTEL_HWCONFIG_POCS_PUSH_CONSTANT_URB_RESERVED_SIZE, /* 40 */
> + INTEL_HWCONFIG_URB_REGION_ALIGNMENT_SIZE_IN_BYTES, /* 41 */
> + INTEL_HWCONFIG_URB_ALLOCATION_SIZE_UNITS_IN_BYTES, /* 42 */
> + INTEL_HWCONFIG_MAX_URB_SIZE_CCS_IN_BYTES, /* 43 */
> + INTEL_HWCONFIG_VS_MIN_DEREF_BLOCK_SIZE_HANDLE_COUNT, /* 44 */
> + INTEL_HWCONFIG_DS_MIN_DEREF_BLOCK_SIZE_HANDLE_COUNT, /* 45 */
> + INTEL_HWCONFIG_NUM_RT_STACKS_PER_DSS, /* 46 */
> + INTEL_HWCONFIG_MAX_URB_STARTING_ADDRESS, /* 47 */
> + INTEL_HWCONFIG_MIN_CS_URB_ENTRIES, /* 48 */
> + INTEL_HWCONFIG_MAX_CS_URB_ENTRIES, /* 49 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_URB, /* 50 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_REST, /* 51 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_DC, /* 52 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_RO, /* 53 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_Z, /* 54 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_COLOR, /* 55 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_UNIFIED_TILE_CACHE, /* 56 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_COMMAND_BUFFER, /* 57 */
> + INTEL_HWCONFIG_L3_ALLOC_PER_BANK_RW, /* 58 */
> + INTEL_HWCONFIG_MAX_NUM_L3_CONFIGS, /* 59 */
> + INTEL_HWCONFIG_BINDLESS_SURFACE_OFFSET_BIT_COUNT, /* 60 */
> + INTEL_HWCONFIG_RESERVED_CCS_WAYS, /* 61 */
> + INTEL_HWCONFIG_CSR_SIZE_IN_MB, /* 62 */
> + INTEL_HWCONFIG_GEOMETRY_PIPES_PER_SLICE, /* 63 */
> + INTEL_HWCONFIG_L3_BANK_SIZE_IN_KB, /* 64 */
> + INTEL_HWCONFIG_SLM_SIZE_PER_DSS, /* 65 */
> + INTEL_HWCONFIG_MAX_PIXEL_FILL_RATE_PER_SLICE, /* 66 */
> + INTEL_HWCONFIG_MAX_PIXEL_FILL_RATE_PER_DSS, /* 67 */
> + INTEL_HWCONFIG_URB_SIZE_PER_SLICE_IN_KB, /* 68 */
> + INTEL_HWCONFIG_URB_SIZE_PER_L3_BANK_COUNT_IN_KB, /* 69 */
> + INTEL_HWCONFIG_MAX_SUBSLICE, /* 70 */
> + INTEL_HWCONFIG_MAX_EU_PER_SUBSLICE, /* 71 */
> + INTEL_HWCONFIG_RAMBO_L3_BANK_SIZE_IN_KB, /* 72 */
> + INTEL_HWCONFIG_SLM_SIZE_PER_SS_IN_KB, /* 73 */
> + __INTEL_HWCONFIG_LIMIT
what's the purpose of this 'limit' ?
> +};
> +
below are values definitions just for two keys,
what about others like MAX_PIXEL_FILL_RATE ?
either add them all or introduce by one while adding support
> +enum {
> + INTEL_HWCONFIG_MEMORY_TYPE_LPDDR4 = 0,
> + INTEL_HWCONFIG_MEMORY_TYPE_LPDDR5,
> +};
> +
> +#define INTEL_HWCONFIG_CACHE_TYPE_L3 BIT(0)
> +#define INTEL_HWCONFIG_CACHE_TYPE_LLC BIT(1)
> +#define INTEL_HWCONFIG_CACHE_TYPE_EDRAM BIT(2)
why mixing style for KLV values ? you can still use enum:
enum {
INTEL_HWCONFIG_CACHE_TYPE_L3 = BIT(0),
INTEL_HWCONFIG_CACHE_TYPE_LLC = BIT(1),
INTEL_HWCONFIG_CACHE_TYPE_EDRAM = BIT(2),
};
and as you're using BIT macro then likely you should earlier add:
#include <linux/bits.h>
> +
> +#endif /* _INTEL_HWCONFIG_TYPES_H_ */
> diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
> index 90efef8a73e4..075f56a040b7 100644
> --- a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
> +++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
> @@ -19,6 +19,7 @@ enum intel_guc_action {
> INTEL_GUC_ACTION_EXIT_S_STATE = 0x502,
> INTEL_GUC_ACTION_SLPC_REQUEST = 0x3003,
> INTEL_GUC_ACTION_AUTHENTICATE_HUC = 0x4000,
> + INTEL_GUC_ACTION_GET_HWCONFIG = 0x4100,
> INTEL_GUC_ACTION_REGISTER_COMMAND_TRANSPORT_BUFFER = 0x4505,
> INTEL_GUC_ACTION_DEREGISTER_COMMAND_TRANSPORT_BUFFER = 0x4506,
> INTEL_GUC_ACTION_LIMIT
> diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h
> index 488b6061ee89..f9e2a6aaef4a 100644
> --- a/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h
> +++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h
> @@ -8,6 +8,10 @@
>
> enum intel_guc_response_status {
> INTEL_GUC_RESPONSE_STATUS_SUCCESS = 0x0,
> + INTEL_GUC_RESPONSE_NOT_SUPPORTED = 0x20,
> + INTEL_GUC_RESPONSE_NO_ATTRIBUTE_TABLE = 0x201,
> + INTEL_GUC_RESPONSE_NO_DECRYPTION_KEY = 0x202,
> + INTEL_GUC_RESPONSE_DECRYPTION_FAILED = 0x204,
> INTEL_GUC_RESPONSE_STATUS_GENERIC_FAIL = 0xF000,
> };
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> index f147cb389a20..01839d5eb130 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> @@ -407,13 +407,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
> /*
> * No GuC command should ever take longer than 10ms.
> * Fast commands should still complete in 10us.
> + * Except for the hwconfig table query, which takes ~50ms.
I assume this is a limitation of the specific fw release and will be
fixed in next releases, so maybe worth to add some FIXME to don't forget
to drop this hack once fw is fixed ?
> */
> ret = __intel_wait_for_register_fw(uncore,
> guc_send_reg(guc, 0),
> INTEL_GUC_MSG_TYPE_MASK,
> INTEL_GUC_MSG_TYPE_RESPONSE <<
> INTEL_GUC_MSG_TYPE_SHIFT,
> - 10, 10, &status);
> + 10, 100, &status);
> /* If GuC explicitly returned an error, convert it to -EIO */
> if (!ret && !INTEL_GUC_MSG_IS_RESPONSE_SUCCESS(status))
> ret = -EIO;
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> index 4abc59f6f3cd..8307de463af0 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> @@ -12,6 +12,7 @@
> #include "intel_guc_ct.h"
> #include "intel_guc_log.h"
> #include "intel_guc_reg.h"
> +#include "intel_guc_hwconfig.h"
> #include "intel_uc_fw.h"
> #include "i915_utils.h"
> #include "i915_vma.h"
> @@ -27,6 +28,7 @@ struct intel_guc {
> struct intel_uc_fw fw;
> struct intel_guc_log log;
> struct intel_guc_ct ct;
> + struct intel_guc_hwconfig hwconfig;
>
> /* intel_guc_recv interrupt related state */
> spinlock_t irq_lock;
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
> new file mode 100644
> index 000000000000..938b1edb7209
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
> @@ -0,0 +1,167 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2020 Intel Corporation
2021
> + */
> +
> +#include "gt/intel_gt.h"
> +#include "gt/intel_hwconfig_types.h"
> +#include "i915_drv.h"
> +#include "i915_memcpy.h"
> +#include "intel_guc_hwconfig.h"
> +
> +static
> +inline struct intel_guc *hwconfig_to_guc(struct intel_guc_hwconfig *hwconfig)
no need to (badly) split lines, column limit is 100
> +{
> + return container_of(hwconfig, struct intel_guc, hwconfig);
> +}
> +
> +/**
this doesn't looks like kernel doc
> + * GuC has a blob containing hardware configuration information (hwconfig).
later you are using "HWConfig" name
> + * This is formatted as a simple and flexible KLV (Key/Length/Value) table.
in file intel_hwconfig_types.h there was statement
"Intel devices provide a KLV ..."
so maybe we don't have to repeat that here and also just move example
below to .h where whole concept could be explained in one place.
> + *
> + * For example, a minimal version could be:
> + * enum device_attr {
> + * ATTR_SOME_VALUE = 0,
> + * ATTR_SOME_MASK = 1,
> + * };
> + *
> + * static const u32 hwconfig[] = {
> + * ATTR_SOME_VALUE,
> + * 1, // Value Length in DWords
> + * 8, // Value
> + *
> + * ATTR_SOME_MASK,
> + * 3,
> + * 0x00FFFFFFFF, 0xFFFFFFFF, 0xFF000000,
> + * };
> + *
> + * The attribute ids are defined in a hardware spec. The current list as
> + * known to the i915 driver can be found in i915/gt/intel_guc_hwconfig_types.h
> + */
> +
> +static int __guc_action_get_hwconfig(struct intel_guc_hwconfig *hwconfig,
all other "guc_action" functions take directly "guc" as param
> + u32 ggtt_offset, u32 ggtt_size)
> +{
> + struct intel_guc *guc = hwconfig_to_guc(hwconfig);
> + struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
> + u32 action[] = {
> + INTEL_GUC_ACTION_GET_HWCONFIG,
> + ggtt_offset,
> + ggtt_size,
> + (INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
> + };
> + int ret;
> +
> + ret = intel_guc_send_mmio(guc, action, ARRAY_SIZE(action), NULL, 0);
why this is over MMIO?
as you need to pass GGTT then CTB is also already available...
> + if (ret == -ENXIO)
> + return -ENOENT;
> +
> + if (!ggtt_size && !ret)
> + ret = -EINVAL;
> +
> + return ret;
> +}
> +
> +static int guc_hwconfig_discover_size(struct intel_guc_hwconfig *hwconfig)
> +{
> + int ret;
> +
> + /* Sending a query with too small a table will return the size of the table */
likely: "Sending a query with zero buffer size will return .."
> + ret = __guc_action_get_hwconfig(hwconfig, 0, 0);
> + if (ret < 0)
> + return ret;
> +
> + hwconfig->size = ret;
> + return 0;
> +}
> +
> +static int guc_hwconfig_fill_buffer(struct intel_guc_hwconfig *hwconfig)
> +{
> + struct intel_guc *guc = hwconfig_to_guc(hwconfig);
> + struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
> + u32 ggtt_offset;
> + int ret;
> + struct i915_vma *vma;
> + void *vaddr;
nit: some would prefer this order:
struct i915_vma *vma;
u32 ggtt_offset;
void *vaddr;
int ret;
> +
> + GEM_BUG_ON(!hwconfig->size);
> +
> + ret = intel_guc_allocate_and_map_vma(guc, hwconfig->size, &vma, &vaddr);
> + if (ret) {
> + drm_err(&i915->drm, "HWConfig: Failed to allocate buffer: %d!\n", ret);
we can fail in many different ways, also in other places, why only this
case has dedicated error message ?
nit: to be more friendly we can print error code with %pe
> + return ret;
> + }
> +
> + ggtt_offset = intel_guc_ggtt_offset(guc, vma);
> +
> + ret = __guc_action_get_hwconfig(hwconfig, ggtt_offset, hwconfig->size);
> + if (ret >= 0)
> + memcpy(hwconfig->ptr, vaddr, hwconfig->size);
do you plan to add some validation of the received klvs ?
like if last one is not truncated ?
and to (debug) print it anywhere ?
and maybe to add to error capture?
> +
> + i915_vma_unpin_and_release(&vma, I915_VMA_RELEASE_MAP);
> +
> + return ret;
> +}
> +
> +static bool has_table(struct drm_i915_private *i915)
> +{
> + if (IS_ALDERLAKE_P(i915)) {
> + if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
> + return 0;
> +
> + return 1;
nit: this could be single line:
return !IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0);
and maybe add few words as in commit message you said all ADP-P have it
> + }
> +
> + return 0;
since you defined function as returning bool, then use true/false
> +}
> +
> +/**
> + * intel_guc_hwconfig_init - Initialize the HWConfig
> + *
> + * Retrieve the HWConfig table from the GuC and save it away in a local memory
> + * allocation. It can then be queried on demand by other users later on.
> + */
> +int intel_guc_hwconfig_init(struct intel_guc_hwconfig *hwconfig)
> +{
> + struct intel_guc *guc = hwconfig_to_guc(hwconfig);
> + struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
> + int ret;
> +
> + if (!has_table(i915))
> + return 0;
> +
> + ret = guc_hwconfig_discover_size(hwconfig);
> + if (ret)
> + return ret;
> +
> + hwconfig->ptr = kmalloc(hwconfig->size, GFP_KERNEL);
> + if (!hwconfig->ptr) {
> + hwconfig->size = 0;
> + return -ENOMEM;
> + }
> +
> + ret = guc_hwconfig_fill_buffer(hwconfig);
> + if (ret < 0) {
> + kfree(hwconfig->ptr);
> + hwconfig->size = 0;
> + hwconfig->ptr = NULL;
> + return ret;
maybe use onion cleanup ?
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * intel_guc_hwconfig_fini - Finalize the HWConfig
> + *
> + * Free up the memory allocation holding the table.
> + */
> +void intel_guc_hwconfig_fini(struct intel_guc_hwconfig *hwconfig)
> +{
> + if (!hwconfig->size)
> + return;
not needed, kfree will work with null
> +
> + kfree(hwconfig->ptr);
> + hwconfig->size = 0;
> + hwconfig->ptr = NULL;
> +}
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h
> new file mode 100644
> index 000000000000..91e96d88d713
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2020 Intel Corporation
2021
> + */
> +
> +#ifndef _INTEL_GUC_HWCONFIG_H_
> +#define _INTEL_GUC_HWCONFIG_H_
> +
> +#include <linux/types.h>
> +
> +struct intel_guc_hwconfig {
> + u32 size;
size in bytes or dwords ?
> + void *ptr;
nit: as this is ptr to klv dwords, maybe:
u32 *kls;
> +};
> +
> +int intel_guc_hwconfig_init(struct intel_guc_hwconfig *hwconfig);
> +void intel_guc_hwconfig_fini(struct intel_guc_hwconfig *hwconfig);
> +
> +#endif /* _INTEL_GUC_HWCONFIG_H_ */
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> index 6d8b9233214e..b289693f9767 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> @@ -502,6 +502,10 @@ static int __uc_init_hw(struct intel_uc *uc)
>
> intel_huc_auth(huc);
>
> + ret = intel_guc_hwconfig_init(&guc->hwconfig);
> + if (ret)
> + goto err_log_capture;
> +
> if (intel_uc_uses_guc_submission(uc))
> intel_guc_submission_enable(guc);
>
> @@ -552,6 +556,8 @@ static void __uc_fini_hw(struct intel_uc *uc)
> if (intel_uc_uses_guc_submission(uc))
> intel_guc_submission_disable(guc);
>
> + intel_guc_hwconfig_fini(&guc->hwconfig);
> +
> __uc_sanitize(uc);
> }
>
>
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