In the event of a job timeout, debug dump information will be written into /sys/class/devcoredump.
Inspired by etnaviv's similar feature.
Signed-off-by: Adrián Larumbe adrian.larumbe@collabora.com --- drivers/gpu/drm/panfrost/Kconfig | 1 + drivers/gpu/drm/panfrost/Makefile | 3 +- drivers/gpu/drm/panfrost/panfrost_dump.c | 249 +++++++++++++++++++++++ drivers/gpu/drm/panfrost/panfrost_dump.h | 12 ++ drivers/gpu/drm/panfrost/panfrost_job.c | 3 + include/uapi/drm/panfrost_drm.h | 47 +++++ 6 files changed, 314 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/panfrost/panfrost_dump.c create mode 100644 drivers/gpu/drm/panfrost/panfrost_dump.h
diff --git a/drivers/gpu/drm/panfrost/Kconfig b/drivers/gpu/drm/panfrost/Kconfig index 86cdc0ce79e6..079600328be1 100644 --- a/drivers/gpu/drm/panfrost/Kconfig +++ b/drivers/gpu/drm/panfrost/Kconfig @@ -11,6 +11,7 @@ config DRM_PANFROST select DRM_GEM_SHMEM_HELPER select PM_DEVFREQ select DEVFREQ_GOV_SIMPLE_ONDEMAND + select WANT_DEV_COREDUMP help DRM driver for ARM Mali Midgard (T6xx, T7xx, T8xx) and Bifrost (G3x, G5x, G7x) GPUs. diff --git a/drivers/gpu/drm/panfrost/Makefile b/drivers/gpu/drm/panfrost/Makefile index b71935862417..7da2b3f02ed9 100644 --- a/drivers/gpu/drm/panfrost/Makefile +++ b/drivers/gpu/drm/panfrost/Makefile @@ -9,6 +9,7 @@ panfrost-y := \ panfrost_gpu.o \ panfrost_job.o \ panfrost_mmu.o \ - panfrost_perfcnt.o + panfrost_perfcnt.o \ + panfrost_dump.o
obj-$(CONFIG_DRM_PANFROST) += panfrost.o diff --git a/drivers/gpu/drm/panfrost/panfrost_dump.c b/drivers/gpu/drm/panfrost/panfrost_dump.c new file mode 100644 index 000000000000..a710ed7bcefa --- /dev/null +++ b/drivers/gpu/drm/panfrost/panfrost_dump.c @@ -0,0 +1,249 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright 2021 Collabora ltd. */ + +#include <linux/err.h> +#include <linux/device.h> +#include <linux/devcoredump.h> +#include <linux/moduleparam.h> +#include <linux/iosys-map.h> +#include <drm/panfrost_drm.h> +#include <drm/drm_device.h> + +#include "panfrost_job.h" +#include "panfrost_gem.h" +#include "panfrost_regs.h" +#include "panfrost_dump.h" +#include "panfrost_device.h" + +static bool panfrost_dump_core = true; +module_param_named(dump_core, panfrost_dump_core, bool, 0600); + +struct panfrost_dump_iterator { + void *start; + struct panfrost_dump_object_header *hdr; + void *data; +}; + +static const unsigned short panfrost_dump_registers[] = { + SHADER_READY_LO, + SHADER_READY_HI, + TILER_READY_LO, + TILER_READY_HI, + L2_READY_LO, + L2_READY_HI, + JOB_INT_MASK, + JOB_INT_STAT, + JS_HEAD_LO(0), + JS_HEAD_HI(0), + JS_TAIL_LO(0), + JS_TAIL_HI(0), + JS_AFFINITY_LO(0), + JS_AFFINITY_HI(0), + JS_CONFIG(0), + JS_STATUS(0), + JS_HEAD_NEXT_LO(0), + JS_HEAD_NEXT_HI(0), + JS_AFFINITY_NEXT_LO(0), + JS_AFFINITY_NEXT_HI(0), + JS_CONFIG_NEXT(0), + MMU_INT_MASK, + MMU_INT_STAT, + AS_TRANSTAB_LO(0), + AS_TRANSTAB_HI(0), + AS_MEMATTR_LO(0), + AS_MEMATTR_HI(0), + AS_FAULTSTATUS(0), + AS_FAULTADDRESS_LO(0), + AS_FAULTADDRESS_HI(0), + AS_STATUS(0), +}; + +static void panfrost_core_dump_header(struct panfrost_dump_iterator *iter, + u32 type, void *data_end) +{ + struct panfrost_dump_object_header *hdr = iter->hdr; + + hdr->magic = cpu_to_le32(PANFROSTDUMP_MAGIC); + hdr->type = cpu_to_le32(type); + hdr->file_offset = cpu_to_le32(iter->data - iter->start); + hdr->file_size = cpu_to_le32(data_end - iter->data); + + iter->hdr++; + iter->data += le32_to_cpu(hdr->file_size); +} + +static void +panfrost_core_dump_registers(struct panfrost_dump_iterator *iter, + struct panfrost_device *pfdev, + u32 as_nr, int slot) +{ + struct panfrost_dump_registers *dumpreg = iter->data; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(panfrost_dump_registers); i++, dumpreg++) { + unsigned int js_as_offset = 0; + unsigned int reg; + + if (panfrost_dump_registers[i] >= JS_HEAD_LO(0) && + panfrost_dump_registers[i] <= JS_CONFIG_NEXT(0)) + js_as_offset = slot * JS_SLOT_STRIDE; + else if (panfrost_dump_registers[i] >= AS_TRANSTAB_LO(0) && + panfrost_dump_registers[i] <= AS_STATUS(0)) + js_as_offset = (as_nr << MMU_AS_SHIFT); + + reg = panfrost_dump_registers[i] + js_as_offset; + + dumpreg->reg = cpu_to_le32(reg); + dumpreg->value = cpu_to_le32(gpu_read(pfdev, reg)); + } + + panfrost_core_dump_header(iter, PANFROSTDUMP_BUF_REG, dumpreg); +} + +void panfrost_core_dump(struct panfrost_job *job) +{ + struct panfrost_device *pfdev = job->pfdev; + struct panfrost_dump_iterator iter; + struct drm_gem_object *dbo; + unsigned int n_obj, n_bomap_pages; + __le64 *bomap, *bomap_start; + size_t file_size; + u32 as_nr; + int slot; + int ret, i; + + as_nr = job->mmu->as; + slot = panfrost_job_get_slot(job); + + /* Only catch the first event, or when manually re-armed */ + if (!panfrost_dump_core) + return; + panfrost_dump_core = false; + + /* At least, we dump registers and end marker */ + n_obj = 2; + n_bomap_pages = 0; + file_size = ARRAY_SIZE(panfrost_dump_registers) * + sizeof(struct panfrost_dump_registers); + + /* Add in the active buffer objects */ + for (i = 0; i < job->bo_count; i++) { + /* + * Even though the CPU could be configured to use 16K or 64K pages, this + * is a very unusual situation for most kernel setups on SoCs that have + * a Panfrost device. Also many places across the driver make the somewhat + * arbitrary assumption that Panfrost's MMU page size is the same as the CPU's, + * so let's have a sanity check to ensure that's always the case + */ + WARN_ON(!IS_ALIGNED(dbo->size, PAGE_SIZE)); + + dbo = job->bos[i]; + file_size += dbo->size; + n_bomap_pages += dbo->size >> PAGE_SHIFT; + n_obj++; + } + + /* If we have any buffer objects, add a bomap object */ + if (n_bomap_pages) { + file_size += n_bomap_pages * sizeof(*bomap); + n_obj++; + } + + /* Add the size of the headers */ + file_size += sizeof(*iter.hdr) * n_obj; + + /* + * Allocate the file in vmalloc memory, it's likely to be big. + * The reason behind these GFP flags is that we don't want to trigger the + * OOM killer in the event that not enough memory could be found for our + * dump file. We also don't want the allocator to do any error reporting, + * as the right behaviour is failing gracefully if a big enough buffer + * could not be allocated. + */ + iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_NOWARN | + __GFP_NORETRY); + if (!iter.start) { + dev_warn(pfdev->dev, "failed to allocate devcoredump file\n"); + return; + } + + /* Point the data member after the headers */ + iter.hdr = iter.start; + iter.data = &iter.hdr[n_obj]; + + memset(iter.hdr, 0, iter.data - iter.start); + + /* + * For now, we write the job identifier in the register dump header, + * so that we can decode the entire dump later with pandecode + */ + iter.hdr->reghdr.jc = cpu_to_le64(job->jc); + iter.hdr->reghdr.major = cpu_to_le32(PANFROSTDUMP_MAJOR); + iter.hdr->reghdr.minor = cpu_to_le32(PANFROSTDUMP_MINOR); + iter.hdr->reghdr.gpu_id = cpu_to_le32(pfdev->features.id); + iter.hdr->reghdr.nbos = cpu_to_le64(job->bo_count); + + panfrost_core_dump_registers(&iter, pfdev, as_nr, slot); + + /* Reserve space for the bomap */ + if (job->bo_count) { + bomap_start = bomap = iter.data; + memset(bomap, 0, sizeof(*bomap) * n_bomap_pages); + panfrost_core_dump_header(&iter, PANFROSTDUMP_BUF_BOMAP, + bomap + n_bomap_pages); + } + + for (i = 0; i < job->bo_count; i++) { + struct iosys_map map; + struct panfrost_gem_mapping *mapping; + struct panfrost_gem_object *bo; + struct sg_page_iter page_iter; + void *vaddr; + + bo = to_panfrost_bo(job->bos[i]); + mapping = job->mappings[i]; + + if (!bo->base.sgt) { + dev_err(pfdev->dev, "Panfrost Dump: BO has no sgt, cannot dump\n"); + iter.hdr->bomap.valid = 0; + goto dump_header; + } + + ret = drm_gem_shmem_vmap(&bo->base, &map); + if (ret) { + dev_err(pfdev->dev, "Panfrost Dump: couldn't map Buffer Object\n"); + iter.hdr->bomap.valid = 0; + goto dump_header; + } + + WARN_ON(!mapping->active); + + iter.hdr->bomap.data[0] = cpu_to_le32((bomap - bomap_start)); + + for_each_sgtable_page(bo->base.sgt, &page_iter, 0) { + struct page *page = sg_page_iter_page(&page_iter); + + if (!IS_ERR(page)) { + *bomap++ = cpu_to_le64(page_to_phys(page)); + } else { + dev_err(pfdev->dev, "Panfrost Dump: wrong page\n"); + *bomap++ = ~cpu_to_le64(0); + } + } + + iter.hdr->bomap.iova = cpu_to_le64(mapping->mmnode.start << PAGE_SHIFT); + + vaddr = map.vaddr; + memcpy(iter.data, vaddr, bo->base.base.size); + + drm_gem_shmem_vunmap(&bo->base, &map); + + iter.hdr->bomap.valid = cpu_to_le64(1); + +dump_header: panfrost_core_dump_header(&iter, PANFROSTDUMP_BUF_BO, iter.data + + bo->base.base.size); + } + panfrost_core_dump_header(&iter, PANFROSTDUMP_BUF_TRAILER, iter.data); + + dev_coredumpv(pfdev->dev, iter.start, iter.data - iter.start, GFP_KERNEL); +} diff --git a/drivers/gpu/drm/panfrost/panfrost_dump.h b/drivers/gpu/drm/panfrost/panfrost_dump.h new file mode 100644 index 000000000000..7d9bcefa5346 --- /dev/null +++ b/drivers/gpu/drm/panfrost/panfrost_dump.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2021 Collabora ltd. + */ + +#ifndef PANFROST_DUMP_H +#define PANFROST_DUMP_H + +struct panfrost_job; +void panfrost_core_dump(struct panfrost_job *job); + +#endif diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c index 7c4208476fbd..dbc597ab46fb 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -20,6 +20,7 @@ #include "panfrost_regs.h" #include "panfrost_gpu.h" #include "panfrost_mmu.h" +#include "panfrost_dump.h"
#define JOB_TIMEOUT_MS 500
@@ -727,6 +728,8 @@ static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job job_read(pfdev, JS_TAIL_LO(js)), sched_job);
+ panfrost_core_dump(job); + atomic_set(&pfdev->reset.pending, 1); panfrost_reset(pfdev, sched_job);
diff --git a/include/uapi/drm/panfrost_drm.h b/include/uapi/drm/panfrost_drm.h index 9e40277d8185..eac87310b348 100644 --- a/include/uapi/drm/panfrost_drm.h +++ b/include/uapi/drm/panfrost_drm.h @@ -224,6 +224,53 @@ struct drm_panfrost_madvise { __u32 retained; /* out, whether backing store still exists */ };
+/* Definitions for coredump decoding in user space */ +#define PANFROSTDUMP_MAJOR 1 +#define PANFROSTDUMP_MINOR 0 + +#define PANFROSTDUMP_MAGIC 0x464E4150 /* PANF */ + +#define PANFROSTDUMP_BUF_REG 0 +#define PANFROSTDUMP_BUF_BOMAP (PANFROSTDUMP_BUF_REG + 1) +#define PANFROSTDUMP_BUF_BO (PANFROSTDUMP_BUF_BOMAP + 1) +#define PANFROSTDUMP_BUF_TRAILER (PANFROSTDUMP_BUF_BO + 1) + +struct panfrost_dump_object_header { + __le32 magic; + __le32 type; + __le32 file_size; + __le32 file_offset; + + union { + struct pan_reg_hdr { + __le64 jc; + __le32 gpu_id; + __le32 major; + __le32 minor; + __le64 nbos; + } reghdr; + + struct pan_bomap_hdr { + __le32 valid; + __le64 iova; + __le32 data[2]; + } bomap; + + /* + * Force same size in case we want to expand the header + * with new fields and also keep it 512-byte aligned + */ + + __le32 sizer[496]; + }; +}; + +/* Registers object, an array of these */ +struct panfrost_dump_registers { + __le32 reg; + __le32 value; +}; + #if defined(__cplusplus) } #endif