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// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include <linux/prandom.h>
#include <uapi/drm/i915_drm.h>
#include "intel_memory_region.h"
#include "i915_drv.h"
#include "i915_ttm_buddy_manager.h"
static const struct {
u16 class;
u16 instance;
} intel_region_map[] = {
[INTEL_REGION_SMEM] = {
.class = INTEL_MEMORY_SYSTEM,
.instance = 0,
},
[INTEL_REGION_LMEM_0] = {
.class = INTEL_MEMORY_LOCAL,
.instance = 0,
},
[INTEL_REGION_STOLEN_SMEM] = {
.class = INTEL_MEMORY_STOLEN_SYSTEM,
.instance = 0,
},
[INTEL_REGION_STOLEN_LMEM] = {
.class = INTEL_MEMORY_STOLEN_LOCAL,
.instance = 0,
},
};
static int __iopagetest(struct intel_memory_region *mem,
u8 __iomem *va, int pagesize,
u8 value, resource_size_t offset,
const void *caller)
{
int byte = prandom_u32_max(pagesize);
u8 result[3];
memset_io(va, value, pagesize); /* or GPF! */
wmb();
result[0] = ioread8(va);
result[1] = ioread8(va + byte);
result[2] = ioread8(va + pagesize - 1);
if (memchr_inv(result, value, sizeof(result))) {
dev_err(mem->i915->drm.dev,
"Failed to read back from memory region:%pR at [%pa + %pa] for %ps; wrote %x, read (%x, %x, %x)\n",
&mem->region, &mem->io_start, &offset, caller,
value, result[0], result[1], result[2]);
return -EINVAL;
}
return 0;
}
static int iopagetest(struct intel_memory_region *mem,
resource_size_t offset,
const void *caller)
{
const u8 val[] = { 0x0, 0xa5, 0xc3, 0xf0 };
void __iomem *va;
int err;
int i;
va = ioremap_wc(mem->io_start + offset, PAGE_SIZE);
if (!va) {
dev_err(mem->i915->drm.dev,
"Failed to ioremap memory region [%pa + %pa] for %ps\n",
&mem->io_start, &offset, caller);
return -EFAULT;
}
for (i = 0; i < ARRAY_SIZE(val); i++) {
err = __iopagetest(mem, va, PAGE_SIZE, val[i], offset, caller);
if (err)
break;
err = __iopagetest(mem, va, PAGE_SIZE, ~val[i], offset, caller);
if (err)
break;
}
iounmap(va);
return err;
}
static resource_size_t random_page(resource_size_t last)
{
/* Limited to low 44b (16TiB), but should suffice for a spot check */
return prandom_u32_max(last >> PAGE_SHIFT) << PAGE_SHIFT;
}
static int iomemtest(struct intel_memory_region *mem,
bool test_all,
const void *caller)
{
resource_size_t last, page;
int err;
if (mem->io_size < PAGE_SIZE)
return 0;
last = mem->io_size - PAGE_SIZE;
/*
* Quick test to check read/write access to the iomap (backing store).
*
* Write a byte, read it back. If the iomapping fails, we expect
* a GPF preventing further execution. If the backing store does not
* exist, the read back will return garbage. We check a couple of pages,
* the first and last of the specified region to confirm the backing
* store + iomap does cover the entire memory region; and we check
* a random offset within as a quick spot check for bad memory.
*/
if (test_all) {
for (page = 0; page <= last; page += PAGE_SIZE) {
err = iopagetest(mem, page, caller);
if (err)
return err;
}
} else {
err = iopagetest(mem, 0, caller);
if (err)
return err;
err = iopagetest(mem, last, caller);
if (err)
return err;
err = iopagetest(mem, random_page(last), caller);
if (err)
return err;
}
return 0;
}
struct intel_memory_region *
intel_memory_region_lookup(struct drm_i915_private *i915,
u16 class, u16 instance)
{
struct intel_memory_region *mr;
int id;
/* XXX: consider maybe converting to an rb tree at some point */
for_each_memory_region(mr, i915, id) {
if (mr->type == class && mr->instance == instance)
return mr;
}
return NULL;
}
struct intel_memory_region *
intel_memory_region_by_type(struct drm_i915_private *i915,
enum intel_memory_type mem_type)
{
struct intel_memory_region *mr;
int id;
for_each_memory_region(mr, i915, id)
if (mr->type == mem_type)
return mr;
return NULL;
}
/**
* intel_memory_region_reserve - Reserve a memory range
* @mem: The region for which we want to reserve a range.
* @offset: Start of the range to reserve.
* @size: The size of the range to reserve.
*
* Return: 0 on success, negative error code on failure.
*/
int intel_memory_region_reserve(struct intel_memory_region *mem,
resource_size_t offset,
resource_size_t size)
{
struct ttm_resource_manager *man = mem->region_private;
GEM_BUG_ON(mem->is_range_manager);
return i915_ttm_buddy_man_reserve(man, offset, size);
}
void intel_memory_region_debug(struct intel_memory_region *mr,
struct drm_printer *printer)
{
drm_printf(printer, "%s: ", mr->name);
if (mr->region_private)
ttm_resource_manager_debug(mr->region_private, printer);
else
drm_printf(printer, "total:%pa bytes\n", &mr->total);
}
static int intel_memory_region_memtest(struct intel_memory_region *mem,
void *caller)
{
struct drm_i915_private *i915 = mem->i915;
int err = 0;
if (!mem->io_start)
return 0;
if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) || i915->params.memtest)
err = iomemtest(mem, i915->params.memtest, caller);
return err;
}
struct intel_memory_region *
intel_memory_region_create(struct drm_i915_private *i915,
resource_size_t start,
resource_size_t size,
resource_size_t min_page_size,
resource_size_t io_start,
resource_size_t io_size,
u16 type,
u16 instance,
const struct intel_memory_region_ops *ops)
{
struct intel_memory_region *mem;
int err;
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
if (!mem)
return ERR_PTR(-ENOMEM);
mem->i915 = i915;
mem->region = (struct resource)DEFINE_RES_MEM(start, size);
mem->io_start = io_start;
mem->io_size = io_size;
mem->min_page_size = min_page_size;
mem->ops = ops;
mem->total = size;
mem->type = type;
mem->instance = instance;
mutex_init(&mem->objects.lock);
INIT_LIST_HEAD(&mem->objects.list);
if (ops->init) {
err = ops->init(mem);
if (err)
goto err_free;
}
err = intel_memory_region_memtest(mem, (void *)_RET_IP_);
if (err)
goto err_release;
return mem;
err_release:
if (mem->ops->release)
mem->ops->release(mem);
err_free:
kfree(mem);
return ERR_PTR(err);
}
void intel_memory_region_set_name(struct intel_memory_region *mem,
const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsnprintf(mem->name, sizeof(mem->name), fmt, ap);
va_end(ap);
}
void intel_memory_region_avail(struct intel_memory_region *mr,
u64 *avail, u64 *visible_avail)
{
if (mr->type == INTEL_MEMORY_LOCAL) {
i915_ttm_buddy_man_avail(mr->region_private,
avail, visible_avail);
*avail <<= PAGE_SHIFT;
*visible_avail <<= PAGE_SHIFT;
} else {
*avail = mr->total;
*visible_avail = mr->total;
}
}
void intel_memory_region_destroy(struct intel_memory_region *mem)
{
int ret = 0;
if (mem->ops->release)
ret = mem->ops->release(mem);
GEM_WARN_ON(!list_empty_careful(&mem->objects.list));
mutex_destroy(&mem->objects.lock);
if (!ret)
kfree(mem);
}
/* Global memory region registration -- only slight layer inversions! */
int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
{
int err, i;
for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
struct intel_memory_region *mem = ERR_PTR(-ENODEV);
u16 type, instance;
if (!HAS_REGION(i915, BIT(i)))
continue;
type = intel_region_map[i].class;
instance = intel_region_map[i].instance;
switch (type) {
case INTEL_MEMORY_SYSTEM:
if (IS_DGFX(i915))
mem = i915_gem_ttm_system_setup(i915, type,
instance);
else
mem = i915_gem_shmem_setup(i915, type,
instance);
break;
case INTEL_MEMORY_STOLEN_LOCAL:
mem = i915_gem_stolen_lmem_setup(i915, type, instance);
if (!IS_ERR(mem))
i915->mm.stolen_region = mem;
break;
case INTEL_MEMORY_STOLEN_SYSTEM:
mem = i915_gem_stolen_smem_setup(i915, type, instance);
if (!IS_ERR(mem))
i915->mm.stolen_region = mem;
break;
default:
continue;
}
if (IS_ERR(mem)) {
err = PTR_ERR(mem);
drm_err(&i915->drm,
"Failed to setup region(%d) type=%d\n",
err, type);
goto out_cleanup;
}
mem->id = i;
i915->mm.regions[i] = mem;
}
return 0;
out_cleanup:
intel_memory_regions_driver_release(i915);
return err;
}
void intel_memory_regions_driver_release(struct drm_i915_private *i915)
{
int i;
for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
struct intel_memory_region *region =
fetch_and_zero(&i915->mm.regions[i]);
if (region)
intel_memory_region_destroy(region);
}
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/intel_memory_region.c"
#include "selftests/mock_region.c"
#endif
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