From: John Harrison John.C.Harrison@Intel.com
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.
The table is stored in the GT structure so that it can be fetched once at driver load time. Keeping inside a GuC structure would mean it would be release and reloaded on a GuC reset (part of a full GT reset). However, the table does not change just because the GT has been reset and the GuC reloaded. Also, dynamic memory allocations inside the reset path are a problem.
Note that the table is only available on ADL-P and later platforms.
v2: Move to GT level to avoid memory allocation during reset path (and unnecessary re-read of the table on a reset).
Cc: Michal Wajdeczko michal.wajdeczko@intel.com Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: John Harrison John.C.Harrison@Intel.com Reviewed-by: Matthew Brost matthew.brost@intel.com (v1)
Mush: hwconf --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/gt/intel_gt.c | 6 + drivers/gpu/drm/i915/gt/intel_gt_types.h | 4 + drivers/gpu/drm/i915/gt/intel_hwconfig.h | 21 +++ .../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h | 1 + .../gpu/drm/i915/gt/uc/abi/guc_errors_abi.h | 4 + .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c | 160 ++++++++++++++++++ 7 files changed, 197 insertions(+) create mode 100644 drivers/gpu/drm/i915/gt/intel_hwconfig.h create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 713f59a88312..8da4a1fe8b36 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -193,6 +193,7 @@ i915-y += gt/uc/intel_uc.o \ gt/uc/intel_guc_rc.o \ gt/uc/intel_guc_slpc.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_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c index e6f6bf7c3926..2ad55d7ffe53 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt.c +++ b/drivers/gpu/drm/i915/gt/intel_gt.c @@ -711,6 +711,11 @@ int intel_gt_init(struct intel_gt *gt) if (err) goto err_uc_init;
+ /* Table failure is bad but not currently fatal */ + err = intel_gt_init_hwconfig(gt); + if (err) + drm_err(>->i915->drm, "Failed to retrieve hwconfig table: %d\n", err); + err = __engines_record_defaults(gt); if (err) goto err_gt; @@ -792,6 +797,7 @@ void intel_gt_driver_release(struct intel_gt *gt) intel_gt_pm_fini(gt); intel_gt_fini_scratch(gt); intel_gt_fini_buffer_pool(gt); + intel_gt_fini_hwconfig(gt); }
void intel_gt_driver_late_release(struct intel_gt *gt) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h index f20687796490..514b92cff9b0 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h @@ -20,6 +20,7 @@ #include "i915_vma.h" #include "intel_engine_types.h" #include "intel_gt_buffer_pool_types.h" +#include "intel_hwconfig.h" #include "intel_llc_types.h" #include "intel_reset_types.h" #include "intel_rc6_types.h" @@ -199,6 +200,9 @@ struct intel_gt { struct sseu_dev_info sseu;
unsigned long mslice_mask; + + /** @hwconfig: hardware configuration data */ + struct intel_hwconfig hwconfig; } info;
struct { diff --git a/drivers/gpu/drm/i915/gt/intel_hwconfig.h b/drivers/gpu/drm/i915/gt/intel_hwconfig.h new file mode 100644 index 000000000000..322290780b67 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_hwconfig.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2022 Intel Corporation + */ + +#ifndef _INTEL_HWCONFIG_H_ +#define _INTEL_HWCONFIG_H_ + +#include <linux/types.h> + +struct intel_gt; + +struct intel_hwconfig { + u32 size; + void *ptr; +}; + +int intel_gt_init_hwconfig(struct intel_gt *gt); +void intel_gt_fini_hwconfig(struct intel_gt *gt); + +#endif /* _INTEL_HWCONFIG_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 7afdadc7656f..a9a329e53c35 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 @@ -129,6 +129,7 @@ enum intel_guc_action { INTEL_GUC_ACTION_ENGINE_FAILURE_NOTIFICATION = 0x1009, INTEL_GUC_ACTION_SETUP_PC_GUCRC = 0x3004, INTEL_GUC_ACTION_AUTHENTICATE_HUC = 0x4000, + INTEL_GUC_ACTION_GET_HWCONFIG = 0x4100, INTEL_GUC_ACTION_REGISTER_CONTEXT = 0x4502, INTEL_GUC_ACTION_DEREGISTER_CONTEXT = 0x4503, INTEL_GUC_ACTION_REGISTER_COMMAND_TRANSPORT_BUFFER = 0x4505, 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 c20658ee85a5..8085fb181274 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_hwconfig.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c new file mode 100644 index 000000000000..d2dcd1e538ce --- /dev/null +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#include "gt/intel_gt.h" +#include "gt/intel_hwconfig.h" +#include "i915_drv.h" +#include "i915_memcpy.h" + +/* + * GuC has a blob containing hardware configuration information (HWConfig). + * This is formatted as a simple and flexible KLV (Key/Length/Value) table. + * + * 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. + */ + +static int __guc_action_get_hwconfig(struct intel_guc *guc, + struct intel_hwconfig *hwconfig, + u32 ggtt_offset, u32 ggtt_size) +{ + u32 action[] = { + INTEL_GUC_ACTION_GET_HWCONFIG, + ggtt_offset, + 0, /* upper 32 bits of address */ + ggtt_size, + }; + int ret; + + ret = intel_guc_send_mmio(guc, action, ARRAY_SIZE(action), NULL, 0); + if (ret == -ENXIO) + return -ENOENT; + + if (!ggtt_size && !ret) + ret = -EINVAL; + + return ret; +} + +static int guc_hwconfig_discover_size(struct intel_guc *guc, struct intel_hwconfig *hwconfig) +{ + int ret; + + /* Sending a query with zero offset/size will return the size of the table */ + ret = __guc_action_get_hwconfig(guc, hwconfig, 0, 0); + if (ret < 0) + return ret; + + hwconfig->size = ret; + return 0; +} + +static int guc_hwconfig_fill_buffer(struct intel_guc *guc, struct intel_hwconfig *hwconfig) +{ + 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) + return ret; + + ggtt_offset = intel_guc_ggtt_offset(guc, vma); + + ret = __guc_action_get_hwconfig(guc, hwconfig, ggtt_offset, hwconfig->size); + if (ret >= 0) + memcpy(hwconfig->ptr, vaddr, hwconfig->size); + + 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)) + return true; + + return 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. + */ +static int guc_hwconfig_init(struct intel_gt *gt) +{ + struct intel_hwconfig *hwconfig = >->info.hwconfig; + struct intel_guc *guc = >->uc.guc; + int ret; + + if (!has_table(gt->i915)) + return 0; + + ret = guc_hwconfig_discover_size(guc, 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(guc, hwconfig); + if (ret < 0) { + intel_gt_fini_hwconfig(gt); + return ret; + } + + return 0; +} + +/** + * intel_gt_init_hwconfig - Initialize the HWConfig if available + * + * Retrieve the HWConfig table if available on the current platform. + */ +int intel_gt_init_hwconfig(struct intel_gt *gt) +{ + if (!intel_uc_uses_guc(>->uc)) + return 0; + + return guc_hwconfig_init(gt); +} + +/** + * intel_gt_fini_hwconfig - Finalize the HWConfig + * + * Free up the memory allocation holding the table. + */ +void intel_gt_fini_hwconfig(struct intel_gt *gt) +{ + struct intel_hwconfig *hwconfig = >->info.hwconfig; + + kfree(hwconfig->ptr); + hwconfig->size = 0; + hwconfig->ptr = NULL; +}