// 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 = PANFROSTDUMP_MAGIC;
hdr->type = type;
hdr->file_offset = iter->data - iter->start;
hdr->file_size = data_end - iter->data;
iter->hdr++;
iter->data += 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_BASE &&
panfrost_dump_registers[i] <= JS_BASE + JS_SLOT_STRIDE)
js_as_offset = slot * JS_SLOT_STRIDE;
else if (panfrost_dump_registers[i] >= MMU_BASE &&
panfrost_dump_registers[i] <= MMU_BASE + MMU_AS_STRIDE)
js_as_offset = (as_nr << MMU_AS_SHIFT);
reg = panfrost_dump_registers[i] + js_as_offset;
dumpreg->reg = reg;
dumpreg->value = 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;
u64 *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
*/
dbo = job->bos[i];
WARN_ON(!IS_ALIGNED(dbo->size, PAGE_SIZE));
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 = job->jc;
iter.hdr->reghdr.major = PANFROSTDUMP_MAJOR;
iter.hdr->reghdr.minor = PANFROSTDUMP_MINOR;
iter.hdr->reghdr.gpu_id = pfdev->features.id;
iter.hdr->reghdr.nbos = 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_vmap_unlocked(&bo->base.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] = bomap - bomap_start;
for_each_sgtable_page(bo->base.sgt, &page_iter, 0)
*bomap++ = page_to_phys(sg_page_iter_page(&page_iter));
iter.hdr->bomap.iova = mapping->mmnode.start << PAGE_SHIFT;
vaddr = map.vaddr;
memcpy(iter.data, vaddr, bo->base.base.size);
drm_gem_vunmap_unlocked(&bo->base.base, &map);
iter.hdr->bomap.valid = 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);
}
Codebase Browser
linux