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nest-open-source / manifest_repos / mali-driver / 0bde759bc5682bba7de558e308410bbc6d08d2d8 / . / bifrost / r12p0 / kernel / drivers / gpu / arm / midgard / mali_kbase_mem_linux.c
blob: 59cc03538f1b028978b81f1baf7b7d71af290c7d [file] [log] [blame]
/*
*
* (C) COPYRIGHT 2010-2018 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
* SPDX-License-Identifier: GPL-2.0
*
*/
/**
* @file mali_kbase_mem_linux.c
* Base kernel memory APIs, Linux implementation.
*/
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/fs.h>
#include <linux/version.h>
#include <linux/dma-mapping.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) && \
(LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
#include <linux/dma-attrs.h>
#endif /* LINUX_VERSION_CODE >= 3.5.0 && < 4.8.0 */
#ifdef CONFIG_DMA_SHARED_BUFFER
#include <linux/dma-buf.h>
#endif /* defined(CONFIG_DMA_SHARED_BUFFER) */
#include <linux/shrinker.h>
#include <linux/cache.h>
#include <mali_kbase.h>
#include <mali_kbase_mem_linux.h>
#include <mali_kbase_config_defaults.h>
#include <mali_kbase_tlstream.h>
#include <mali_kbase_ioctl.h>
static int kbase_tracking_page_setup(struct kbase_context *kctx, struct vm_area_struct *vma);
struct kbase_va_region *kbase_mem_alloc(struct kbase_context *kctx,
u64 va_pages, u64 commit_pages, u64 extent, u64 *flags,
u64 *gpu_va)
{
int zone;
struct kbase_va_region *reg;
struct device *dev;
KBASE_DEBUG_ASSERT(kctx);
KBASE_DEBUG_ASSERT(flags);
KBASE_DEBUG_ASSERT(gpu_va);
dev = kctx->kbdev->dev;
*gpu_va = 0; /* return 0 on failure */
if (!kbase_check_alloc_flags(*flags)) {
dev_warn(dev,
"kbase_mem_alloc called with bad flags (%llx)",
(unsigned long long)*flags);
goto bad_flags;
}
if ((*flags & BASE_MEM_COHERENT_SYSTEM_REQUIRED) != 0 &&
!kbase_device_is_cpu_coherent(kctx->kbdev)) {
dev_warn(dev, "kbase_mem_alloc call required coherent mem when unavailable");
goto bad_flags;
}
if ((*flags & BASE_MEM_COHERENT_SYSTEM) != 0 &&
!kbase_device_is_cpu_coherent(kctx->kbdev)) {
/* Remove COHERENT_SYSTEM flag if coherent mem is unavailable */
*flags &= ~BASE_MEM_COHERENT_SYSTEM;
}
if (kbase_check_alloc_sizes(kctx, *flags, va_pages, commit_pages, extent))
goto bad_sizes;
/* find out which VA zone to use */
if (*flags & BASE_MEM_SAME_VA)
zone = KBASE_REG_ZONE_SAME_VA;
else if (*flags & BASE_MEM_PROT_GPU_EX)
zone = KBASE_REG_ZONE_EXEC;
else
zone = KBASE_REG_ZONE_CUSTOM_VA;
reg = kbase_alloc_free_region(kctx, 0, va_pages, zone);
if (!reg) {
dev_err(dev, "Failed to allocate free region");
goto no_region;
}
if (kbase_update_region_flags(kctx, reg, *flags) != 0)
goto invalid_flags;
if (kbase_reg_prepare_native(reg, kctx) != 0) {
dev_err(dev, "Failed to prepare region");
goto prepare_failed;
}
if (*flags & (BASE_MEM_GROW_ON_GPF|BASE_MEM_TILER_ALIGN_TOP)) {
/* kbase_check_alloc_sizes() already checks extent is valid for
* assigning to reg->extent */
reg->extent = extent;
} else {
reg->extent = 0;
}
if (kbase_alloc_phy_pages(reg, va_pages, commit_pages) != 0) {
dev_warn(dev, "Failed to allocate %lld pages (va_pages=%lld)",
(unsigned long long)commit_pages,
(unsigned long long)va_pages);
goto no_mem;
}
reg->initial_commit = commit_pages;
kbase_gpu_vm_lock(kctx);
/* mmap needed to setup VA? */
if (*flags & BASE_MEM_SAME_VA) {
unsigned long prot = PROT_NONE;
unsigned long va_size = va_pages << PAGE_SHIFT;
unsigned long va_map = va_size;
unsigned long cookie, cookie_nr;
unsigned long cpu_addr;
/* Bind to a cookie */
if (!kctx->cookies) {
dev_err(dev, "No cookies available for allocation!");
kbase_gpu_vm_unlock(kctx);
goto no_cookie;
}
/* return a cookie */
cookie_nr = __ffs(kctx->cookies);
kctx->cookies &= ~(1UL << cookie_nr);
BUG_ON(kctx->pending_regions[cookie_nr]);
kctx->pending_regions[cookie_nr] = reg;
kbase_gpu_vm_unlock(kctx);
/* relocate to correct base */
cookie = cookie_nr + PFN_DOWN(BASE_MEM_COOKIE_BASE);
cookie <<= PAGE_SHIFT;
/*
* 10.1-10.4 UKU userland relies on the kernel to call mmap.
* For all other versions we can just return the cookie
*/
if (kctx->api_version < KBASE_API_VERSION(10, 1) ||
kctx->api_version > KBASE_API_VERSION(10, 4)) {
*gpu_va = (u64) cookie;
return reg;
}
if (*flags & BASE_MEM_PROT_CPU_RD)
prot |= PROT_READ;
if (*flags & BASE_MEM_PROT_CPU_WR)
prot |= PROT_WRITE;
cpu_addr = vm_mmap(kctx->filp, 0, va_map, prot,
MAP_SHARED, cookie);
if (IS_ERR_VALUE(cpu_addr)) {
kbase_gpu_vm_lock(kctx);
kctx->pending_regions[cookie_nr] = NULL;
kctx->cookies |= (1UL << cookie_nr);
kbase_gpu_vm_unlock(kctx);
goto no_mmap;
}
*gpu_va = (u64) cpu_addr;
} else /* we control the VA */ {
if (kbase_gpu_mmap(kctx, reg, 0, va_pages, 1) != 0) {
dev_warn(dev, "Failed to map memory on GPU");
kbase_gpu_vm_unlock(kctx);
goto no_mmap;
}
/* return real GPU VA */
*gpu_va = reg->start_pfn << PAGE_SHIFT;
kbase_gpu_vm_unlock(kctx);
}
return reg;
no_mmap:
no_cookie:
no_mem:
kbase_mem_phy_alloc_put(reg->cpu_alloc);
kbase_mem_phy_alloc_put(reg->gpu_alloc);
invalid_flags:
prepare_failed:
kfree(reg);
no_region:
bad_sizes:
bad_flags:
return NULL;
}
KBASE_EXPORT_TEST_API(kbase_mem_alloc);
int kbase_mem_query(struct kbase_context *kctx,
u64 gpu_addr, u64 query, u64 * const out)
{
struct kbase_va_region *reg;
int ret = -EINVAL;
KBASE_DEBUG_ASSERT(kctx);
KBASE_DEBUG_ASSERT(out);
if (gpu_addr & ~PAGE_MASK) {
dev_warn(kctx->kbdev->dev, "mem_query: gpu_addr: passed parameter is invalid");
return -EINVAL;
}
kbase_gpu_vm_lock(kctx);
/* Validate the region */
reg = kbase_region_tracker_find_region_base_address(kctx, gpu_addr);
if (!reg || (reg->flags & KBASE_REG_FREE))
goto out_unlock;
switch (query) {
case KBASE_MEM_QUERY_COMMIT_SIZE:
if (reg->cpu_alloc->type != KBASE_MEM_TYPE_ALIAS) {
*out = kbase_reg_current_backed_size(reg);
} else {
size_t i;
struct kbase_aliased *aliased;
*out = 0;
aliased = reg->cpu_alloc->imported.alias.aliased;
for (i = 0; i < reg->cpu_alloc->imported.alias.nents; i++)
*out += aliased[i].length;
}
break;
case KBASE_MEM_QUERY_VA_SIZE:
*out = reg->nr_pages;
break;
case KBASE_MEM_QUERY_FLAGS:
{
*out = 0;
if (KBASE_REG_CPU_WR & reg->flags)
*out |= BASE_MEM_PROT_CPU_WR;
if (KBASE_REG_CPU_RD & reg->flags)
*out |= BASE_MEM_PROT_CPU_RD;
if (KBASE_REG_CPU_CACHED & reg->flags)
*out |= BASE_MEM_CACHED_CPU;
if (KBASE_REG_GPU_WR & reg->flags)
*out |= BASE_MEM_PROT_GPU_WR;
if (KBASE_REG_GPU_RD & reg->flags)
*out |= BASE_MEM_PROT_GPU_RD;
if (!(KBASE_REG_GPU_NX & reg->flags))
*out |= BASE_MEM_PROT_GPU_EX;
if (KBASE_REG_SHARE_BOTH & reg->flags)
*out |= BASE_MEM_COHERENT_SYSTEM;
if (KBASE_REG_SHARE_IN & reg->flags)
*out |= BASE_MEM_COHERENT_LOCAL;
if (kctx->api_version >= KBASE_API_VERSION(11, 2)) {
/* Prior to 11.2, these were known about by user-side
* but we did not return them. Returning some of these
* caused certain clients that were not expecting them
* to fail, so we omit all of them as a special-case
* for compatibility reasons */
if (KBASE_REG_PF_GROW & reg->flags)
*out |= BASE_MEM_GROW_ON_GPF;
if (KBASE_REG_SECURE & reg->flags)
*out |= BASE_MEM_SECURE;
}
if (KBASE_REG_TILER_ALIGN_TOP & reg->flags)
*out |= BASE_MEM_TILER_ALIGN_TOP;
WARN(*out & ~BASE_MEM_FLAGS_QUERYABLE,
"BASE_MEM_FLAGS_QUERYABLE needs updating\n");
*out &= BASE_MEM_FLAGS_QUERYABLE;
break;
}
default:
*out = 0;
goto out_unlock;
}
ret = 0;
out_unlock:
kbase_gpu_vm_unlock(kctx);
return ret;
}
/**
* kbase_mem_evictable_reclaim_count_objects - Count number of pages in the
* Ephemeral memory eviction list.
* @s: Shrinker
* @sc: Shrinker control
*
* Return: Number of pages which can be freed.
*/
static
unsigned long kbase_mem_evictable_reclaim_count_objects(struct shrinker *s,
struct shrink_control *sc)
{
struct kbase_context *kctx;
struct kbase_mem_phy_alloc *alloc;
unsigned long pages = 0;
kctx = container_of(s, struct kbase_context, reclaim);
mutex_lock(&kctx->jit_evict_lock);
list_for_each_entry(alloc, &kctx->evict_list, evict_node)
pages += alloc->nents;
mutex_unlock(&kctx->jit_evict_lock);
return pages;
}
/**
* kbase_mem_evictable_reclaim_scan_objects - Scan the Ephemeral memory eviction
* list for pages and try to reclaim them.
* @s: Shrinker
* @sc: Shrinker control
*
* Return: Number of pages freed (can be less then requested) or -1 if the
* shrinker failed to free pages in its pool.
*
* Note:
* This function accesses region structures without taking the region lock,
* this is required as the OOM killer can call the shrinker after the region
* lock has already been held.
* This is safe as we can guarantee that a region on the eviction list will
* not be freed (kbase_mem_free_region removes the allocation from the list
* before destroying it), or modified by other parts of the driver.
* The eviction list itself is guarded by the eviction lock and the MMU updates
* are protected by their own lock.
*/
static
unsigned long kbase_mem_evictable_reclaim_scan_objects(struct shrinker *s,
struct shrink_control *sc)
{
struct kbase_context *kctx;
struct kbase_mem_phy_alloc *alloc;
struct kbase_mem_phy_alloc *tmp;
unsigned long freed = 0;
kctx = container_of(s, struct kbase_context, reclaim);
mutex_lock(&kctx->jit_evict_lock);
list_for_each_entry_safe(alloc, tmp, &kctx->evict_list, evict_node) {
int err;
err = kbase_mem_shrink_gpu_mapping(kctx, alloc->reg,
0, alloc->nents);
if (err != 0) {
/*
* Failed to remove GPU mapping, tell the shrinker
* to stop trying to shrink our slab even though we
* have pages in it.
*/
freed = -1;
goto out_unlock;
}
/*
* Update alloc->evicted before freeing the backing so the
* helper can determine that it needs to bypass the accounting
* and memory pool.
*/
alloc->evicted = alloc->nents;
kbase_free_phy_pages_helper(alloc, alloc->evicted);
freed += alloc->evicted;
list_del_init(&alloc->evict_node);
/*
* Inform the JIT allocator this region has lost backing
* as it might need to free the allocation.
*/
kbase_jit_backing_lost(alloc->reg);
/* Enough pages have been freed so stop now */
if (freed > sc->nr_to_scan)
break;
}
out_unlock:
mutex_unlock(&kctx->jit_evict_lock);
return freed;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0)
static int kbase_mem_evictable_reclaim_shrink(struct shrinker *s,
struct shrink_control *sc)
{
if (sc->nr_to_scan == 0)
return kbase_mem_evictable_reclaim_count_objects(s, sc);
return kbase_mem_evictable_reclaim_scan_objects(s, sc);
}
#endif
int kbase_mem_evictable_init(struct kbase_context *kctx)
{
INIT_LIST_HEAD(&kctx->evict_list);
mutex_init(&kctx->jit_evict_lock);
/* Register shrinker */
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0)
kctx->reclaim.shrink = kbase_mem_evictable_reclaim_shrink;
#else
kctx->reclaim.count_objects = kbase_mem_evictable_reclaim_count_objects;
kctx->reclaim.scan_objects = kbase_mem_evictable_reclaim_scan_objects;
#endif
kctx->reclaim.seeks = DEFAULT_SEEKS;
/* Kernel versions prior to 3.1 :
* struct shrinker does not define batch */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0)
kctx->reclaim.batch = 0;
#endif
register_shrinker(&kctx->reclaim);
return 0;
}
void kbase_mem_evictable_deinit(struct kbase_context *kctx)
{
unregister_shrinker(&kctx->reclaim);
}
/**
* kbase_mem_evictable_mark_reclaim - Mark the pages as reclaimable.
* @alloc: The physical allocation
*/
void kbase_mem_evictable_mark_reclaim(struct kbase_mem_phy_alloc *alloc)
{
struct kbase_context *kctx = alloc->imported.kctx;
int __maybe_unused new_page_count;
kbase_process_page_usage_dec(kctx, alloc->nents);
new_page_count = kbase_atomic_sub_pages(alloc->nents,
&kctx->used_pages);
kbase_atomic_sub_pages(alloc->nents, &kctx->kbdev->memdev.used_pages);
KBASE_TLSTREAM_AUX_PAGESALLOC(
kctx->id,
(u64)new_page_count);
}
/**
* kbase_mem_evictable_unmark_reclaim - Mark the pages as no longer reclaimable.
* @alloc: The physical allocation
*/
static
void kbase_mem_evictable_unmark_reclaim(struct kbase_mem_phy_alloc *alloc)
{
struct kbase_context *kctx = alloc->imported.kctx;
int __maybe_unused new_page_count;
new_page_count = kbase_atomic_add_pages(alloc->nents,
&kctx->used_pages);
kbase_atomic_add_pages(alloc->nents, &kctx->kbdev->memdev.used_pages);
/* Increase mm counters so that the allocation is accounted for
* against the process and thus is visible to the OOM killer,
*/
kbase_process_page_usage_inc(kctx, alloc->nents);
KBASE_TLSTREAM_AUX_PAGESALLOC(
kctx->id,
(u64)new_page_count);
}
int kbase_mem_evictable_make(struct kbase_mem_phy_alloc *gpu_alloc)
{
struct kbase_context *kctx = gpu_alloc->imported.kctx;
lockdep_assert_held(&kctx->reg_lock);
kbase_mem_shrink_cpu_mapping(kctx, gpu_alloc->reg,
0, gpu_alloc->nents);
mutex_lock(&kctx->jit_evict_lock);
/* This allocation can't already be on a list. */
WARN_ON(!list_empty(&gpu_alloc->evict_node));
/*
* Add the allocation to the eviction list, after this point the shrink
* can reclaim it.
*/
list_add(&gpu_alloc->evict_node, &kctx->evict_list);
mutex_unlock(&kctx->jit_evict_lock);
kbase_mem_evictable_mark_reclaim(gpu_alloc);
gpu_alloc->reg->flags |= KBASE_REG_DONT_NEED;
return 0;
}
bool kbase_mem_evictable_unmake(struct kbase_mem_phy_alloc *gpu_alloc)
{
struct kbase_context *kctx = gpu_alloc->imported.kctx;
int err = 0;
lockdep_assert_held(&kctx->reg_lock);
mutex_lock(&kctx->jit_evict_lock);
/*
* First remove the allocation from the eviction list as it's no
* longer eligible for eviction.
*/
list_del_init(&gpu_alloc->evict_node);
mutex_unlock(&kctx->jit_evict_lock);
if (gpu_alloc->evicted == 0) {
/*
* The backing is still present, update the VM stats as it's
* in use again.
*/
kbase_mem_evictable_unmark_reclaim(gpu_alloc);
} else {
/* If the region is still alive ... */
if (gpu_alloc->reg) {
/* ... allocate replacement backing ... */
err = kbase_alloc_phy_pages_helper(gpu_alloc,
gpu_alloc->evicted);
/*
* ... and grow the mapping back to its
* pre-eviction size.
*/
if (!err)
err = kbase_mem_grow_gpu_mapping(kctx,
gpu_alloc->reg,
gpu_alloc->evicted, 0);
gpu_alloc->evicted = 0;
}
}
/* If the region is still alive remove the DONT_NEED attribute. */
if (gpu_alloc->reg)
gpu_alloc->reg->flags &= ~KBASE_REG_DONT_NEED;
return (err == 0);
}
int kbase_mem_flags_change(struct kbase_context *kctx, u64 gpu_addr, unsigned int flags, unsigned int mask)
{
struct kbase_va_region *reg;
int ret = -EINVAL;
unsigned int real_flags = 0;
unsigned int prev_flags = 0;
bool prev_needed, new_needed;
KBASE_DEBUG_ASSERT(kctx);
if (!gpu_addr)
return -EINVAL;
if ((gpu_addr & ~PAGE_MASK) && (gpu_addr >= PAGE_SIZE))
return -EINVAL;
/* nuke other bits */
flags &= mask;
/* check for only supported flags */
if (flags & ~(BASE_MEM_FLAGS_MODIFIABLE))
goto out;
/* mask covers bits we don't support? */
if (mask & ~(BASE_MEM_FLAGS_MODIFIABLE))
goto out;
/* convert flags */
if (BASE_MEM_COHERENT_SYSTEM & flags)
real_flags |= KBASE_REG_SHARE_BOTH;
else if (BASE_MEM_COHERENT_LOCAL & flags)
real_flags |= KBASE_REG_SHARE_IN;
/* now we can lock down the context, and find the region */
down_write(&current->mm->mmap_sem);
kbase_gpu_vm_lock(kctx);
/* Validate the region */
reg = kbase_region_tracker_find_region_base_address(kctx, gpu_addr);
if (!reg || (reg->flags & KBASE_REG_FREE))
goto out_unlock;
/* Is the region being transitioning between not needed and needed? */
prev_needed = (KBASE_REG_DONT_NEED & reg->flags) == KBASE_REG_DONT_NEED;
new_needed = (BASE_MEM_DONT_NEED & flags) == BASE_MEM_DONT_NEED;
if (prev_needed != new_needed) {
/* Aliased allocations can't be made ephemeral */
if (atomic_read(&reg->cpu_alloc->gpu_mappings) > 1)
goto out_unlock;
if (new_needed) {
/* Only native allocations can be marked not needed */
if (reg->cpu_alloc->type != KBASE_MEM_TYPE_NATIVE) {
ret = -EINVAL;
goto out_unlock;
}
ret = kbase_mem_evictable_make(reg->gpu_alloc);
if (ret)
goto out_unlock;
} else {
kbase_mem_evictable_unmake(reg->gpu_alloc);
}
}
/* limit to imported memory */
if (reg->gpu_alloc->type != KBASE_MEM_TYPE_IMPORTED_UMM)
goto out_unlock;
/* no change? */
if (real_flags == (reg->flags & (KBASE_REG_SHARE_IN | KBASE_REG_SHARE_BOTH))) {
ret = 0;
goto out_unlock;
}
/* save for roll back */
prev_flags = reg->flags;
reg->flags &= ~(KBASE_REG_SHARE_IN | KBASE_REG_SHARE_BOTH);
reg->flags |= real_flags;
/* Currently supporting only imported memory */
#ifdef CONFIG_DMA_SHARED_BUFFER
if (reg->gpu_alloc->type == KBASE_MEM_TYPE_IMPORTED_UMM) {
/* Future use will use the new flags, existing mapping will NOT be updated
* as memory should not be in use by the GPU when updating the flags.
*/
ret = 0;
WARN_ON(reg->gpu_alloc->imported.umm.current_mapping_usage_count);
}
#endif /* CONFIG_DMA_SHARED_BUFFER */
/* roll back on error */
if (ret)
reg->flags = prev_flags;
out_unlock:
kbase_gpu_vm_unlock(kctx);
up_write(&current->mm->mmap_sem);
out:
return ret;
}
#define KBASE_MEM_IMPORT_HAVE_PAGES (1UL << BASE_MEM_FLAGS_NR_BITS)
#ifdef CONFIG_DMA_SHARED_BUFFER
static struct kbase_va_region *kbase_mem_from_umm(struct kbase_context *kctx,
int fd, u64 *va_pages, u64 *flags, u32 padding)
{
struct kbase_va_region *reg;
struct dma_buf *dma_buf;
struct dma_buf_attachment *dma_attachment;
bool shared_zone = false;
dma_buf = dma_buf_get(fd);
if (IS_ERR_OR_NULL(dma_buf))
goto no_buf;
dma_attachment = dma_buf_attach(dma_buf, kctx->kbdev->dev);
if (!dma_attachment)
goto no_attachment;
*va_pages = (PAGE_ALIGN(dma_buf->size) >> PAGE_SHIFT) + padding;
if (!*va_pages)
goto bad_size;
if (*va_pages > (U64_MAX / PAGE_SIZE))
/* 64-bit address range is the max */
goto bad_size;
/* ignore SAME_VA */
*flags &= ~BASE_MEM_SAME_VA;
if (*flags & BASE_MEM_IMPORT_SHARED)
shared_zone = true;
#ifdef CONFIG_64BIT
if (!kbase_ctx_flag(kctx, KCTX_COMPAT)) {
/*
* 64-bit tasks require us to reserve VA on the CPU that we use
* on the GPU.
*/
shared_zone = true;
}
#endif
if (shared_zone) {
*flags |= BASE_MEM_NEED_MMAP;
reg = kbase_alloc_free_region(kctx, 0, *va_pages, KBASE_REG_ZONE_SAME_VA);
} else {
reg = kbase_alloc_free_region(kctx, 0, *va_pages, KBASE_REG_ZONE_CUSTOM_VA);
}
if (!reg)
goto no_region;
reg->gpu_alloc = kbase_alloc_create(*va_pages, KBASE_MEM_TYPE_IMPORTED_UMM);
if (IS_ERR_OR_NULL(reg->gpu_alloc))
goto no_alloc_obj;
reg->cpu_alloc = kbase_mem_phy_alloc_get(reg->gpu_alloc);
/* No pages to map yet */
reg->gpu_alloc->nents = 0;
if (kbase_update_region_flags(kctx, reg, *flags) != 0)
goto invalid_flags;
reg->flags &= ~KBASE_REG_FREE;
reg->flags |= KBASE_REG_GPU_NX; /* UMM is always No eXecute */
reg->flags &= ~KBASE_REG_GROWABLE; /* UMM cannot be grown */
reg->flags |= KBASE_REG_GPU_CACHED;
if (*flags & BASE_MEM_SECURE)
reg->flags |= KBASE_REG_SECURE;
if (padding)
reg->flags |= KBASE_REG_IMPORT_PAD;
reg->gpu_alloc->type = KBASE_MEM_TYPE_IMPORTED_UMM;
reg->gpu_alloc->imported.umm.sgt = NULL;
reg->gpu_alloc->imported.umm.dma_buf = dma_buf;
reg->gpu_alloc->imported.umm.dma_attachment = dma_attachment;
reg->gpu_alloc->imported.umm.current_mapping_usage_count = 0;
reg->extent = 0;
return reg;
invalid_flags:
kbase_mem_phy_alloc_put(reg->gpu_alloc);
kbase_mem_phy_alloc_put(reg->cpu_alloc);
no_alloc_obj:
kfree(reg);
no_region:
bad_size:
dma_buf_detach(dma_buf, dma_attachment);
no_attachment:
dma_buf_put(dma_buf);
no_buf:
return NULL;
}
#endif /* CONFIG_DMA_SHARED_BUFFER */
static u32 kbase_get_cache_line_alignment(struct kbase_context *kctx)
{
u32 cpu_cache_line_size = cache_line_size();
u32 gpu_cache_line_size =
(1UL << kctx->kbdev->gpu_props.props.l2_props.log2_line_size);
return ((cpu_cache_line_size > gpu_cache_line_size) ?
cpu_cache_line_size :
gpu_cache_line_size);
}
static struct kbase_va_region *kbase_mem_from_user_buffer(
struct kbase_context *kctx, unsigned long address,
unsigned long size, u64 *va_pages, u64 *flags)
{
long i;
struct kbase_va_region *reg;
long faulted_pages;
int zone = KBASE_REG_ZONE_CUSTOM_VA;
bool shared_zone = false;
u32 cache_line_alignment = kbase_get_cache_line_alignment(kctx);
struct kbase_alloc_import_user_buf *user_buf;
struct page **pages = NULL;
if ((address & (cache_line_alignment - 1)) != 0 ||
(size & (cache_line_alignment - 1)) != 0) {
/* Coherency must be enabled to handle partial cache lines */
if (*flags & (BASE_MEM_COHERENT_SYSTEM |
BASE_MEM_COHERENT_SYSTEM_REQUIRED)) {
/* Force coherent system required flag, import will
* then fail if coherency isn't available
*/
*flags |= BASE_MEM_COHERENT_SYSTEM_REQUIRED;
} else {
dev_warn(kctx->kbdev->dev,
"User buffer is not cache line aligned and no coherency enabled\n");
goto bad_size;
}
}
*va_pages = (PAGE_ALIGN(address + size) >> PAGE_SHIFT) -
PFN_DOWN(address);
if (!*va_pages)
goto bad_size;
if (*va_pages > (UINT64_MAX / PAGE_SIZE))
/* 64-bit address range is the max */
goto bad_size;
/* SAME_VA generally not supported with imported memory (no known use cases) */
*flags &= ~BASE_MEM_SAME_VA;
if (*flags & BASE_MEM_IMPORT_SHARED)
shared_zone = true;
#ifdef CONFIG_64BIT
if (!kbase_ctx_flag(kctx, KCTX_COMPAT)) {
/*
* 64-bit tasks require us to reserve VA on the CPU that we use
* on the GPU.
*/
shared_zone = true;
}
#endif
if (shared_zone) {
*flags |= BASE_MEM_NEED_MMAP;
zone = KBASE_REG_ZONE_SAME_VA;
}
reg = kbase_alloc_free_region(kctx, 0, *va_pages, zone);
if (!reg)
goto no_region;
reg->gpu_alloc = kbase_alloc_create(*va_pages,
KBASE_MEM_TYPE_IMPORTED_USER_BUF);
if (IS_ERR_OR_NULL(reg->gpu_alloc))
goto no_alloc_obj;
reg->cpu_alloc = kbase_mem_phy_alloc_get(reg->gpu_alloc);
if (kbase_update_region_flags(kctx, reg, *flags) != 0)
goto invalid_flags;
reg->flags &= ~KBASE_REG_FREE;
reg->flags |= KBASE_REG_GPU_NX; /* User-buffers are always No eXecute */
reg->flags &= ~KBASE_REG_GROWABLE; /* Cannot be grown */
user_buf = &reg->gpu_alloc->imported.user_buf;
user_buf->size = size;
user_buf->address = address;
user_buf->nr_pages = *va_pages;
user_buf->mm = current->mm;
#if KERNEL_VERSION(4, 11, 0) > LINUX_VERSION_CODE
atomic_inc(&current->mm->mm_count);
#else
mmgrab(current->mm);
#endif
user_buf->pages = kmalloc_array(*va_pages, sizeof(struct page *),
GFP_KERNEL);
if (!user_buf->pages)
goto no_page_array;
/* If the region is coherent with the CPU then the memory is imported
* and mapped onto the GPU immediately.
* Otherwise get_user_pages is called as a sanity check, but with
* NULL as the pages argument which will fault the pages, but not
* pin them. The memory will then be pinned only around the jobs that
* specify the region as an external resource.
*/
if (reg->flags & KBASE_REG_SHARE_BOTH) {
pages = user_buf->pages;
*flags |= KBASE_MEM_IMPORT_HAVE_PAGES;
}
down_read(&current->mm->mmap_sem);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
faulted_pages = get_user_pages(current, current->mm, address, *va_pages,
reg->flags & KBASE_REG_GPU_WR, 0, pages, NULL);
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)
faulted_pages = get_user_pages(address, *va_pages,
reg->flags & KBASE_REG_GPU_WR, 0, pages, NULL);
#else
faulted_pages = get_user_pages(address, *va_pages,
reg->flags & KBASE_REG_GPU_WR ? FOLL_WRITE : 0,
pages, NULL);
#endif
up_read(&current->mm->mmap_sem);
if (faulted_pages != *va_pages)
goto fault_mismatch;
reg->gpu_alloc->nents = 0;
reg->extent = 0;
if (pages) {
struct device *dev = kctx->kbdev->dev;
unsigned long local_size = user_buf->size;
unsigned long offset = user_buf->address & ~PAGE_MASK;
struct tagged_addr *pa = kbase_get_gpu_phy_pages(reg);
/* Top bit signifies that this was pinned on import */
user_buf->current_mapping_usage_count |= PINNED_ON_IMPORT;
for (i = 0; i < faulted_pages; i++) {
dma_addr_t dma_addr;
unsigned long min;
min = MIN(PAGE_SIZE - offset, local_size);
dma_addr = dma_map_page(dev, pages[i],
offset, min,
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, dma_addr))
goto unwind_dma_map;
user_buf->dma_addrs[i] = dma_addr;
pa[i] = as_tagged(page_to_phys(pages[i]));
local_size -= min;
offset = 0;
}
reg->gpu_alloc->nents = faulted_pages;
}
return reg;
unwind_dma_map:
while (i--) {
dma_unmap_page(kctx->kbdev->dev,
user_buf->dma_addrs[i],
PAGE_SIZE, DMA_BIDIRECTIONAL);
}
fault_mismatch:
if (pages) {
for (i = 0; i < faulted_pages; i++)
put_page(pages[i]);
}
no_page_array:
invalid_flags:
kbase_mem_phy_alloc_put(reg->cpu_alloc);
kbase_mem_phy_alloc_put(reg->gpu_alloc);
no_alloc_obj:
kfree(reg);
no_region:
bad_size:
return NULL;
}
u64 kbase_mem_alias(struct kbase_context *kctx, u64 *flags, u64 stride,
u64 nents, struct base_mem_aliasing_info *ai,
u64 *num_pages)
{
struct kbase_va_region *reg;
u64 gpu_va;
size_t i;
bool coherent;
KBASE_DEBUG_ASSERT(kctx);
KBASE_DEBUG_ASSERT(flags);
KBASE_DEBUG_ASSERT(ai);
KBASE_DEBUG_ASSERT(num_pages);
/* mask to only allowed flags */
*flags &= (BASE_MEM_PROT_GPU_RD | BASE_MEM_PROT_GPU_WR |
BASE_MEM_COHERENT_SYSTEM | BASE_MEM_COHERENT_LOCAL |
BASE_MEM_COHERENT_SYSTEM_REQUIRED);
if (!(*flags & (BASE_MEM_PROT_GPU_RD | BASE_MEM_PROT_GPU_WR))) {
dev_warn(kctx->kbdev->dev,
"kbase_mem_alias called with bad flags (%llx)",
(unsigned long long)*flags);
goto bad_flags;
}
coherent = (*flags & BASE_MEM_COHERENT_SYSTEM) != 0 ||
(*flags & BASE_MEM_COHERENT_SYSTEM_REQUIRED) != 0;
if (!stride)
goto bad_stride;
if (!nents)
goto bad_nents;
if ((nents * stride) > (U64_MAX / PAGE_SIZE))
/* 64-bit address range is the max */
goto bad_size;
/* calculate the number of pages this alias will cover */
*num_pages = nents * stride;
#ifdef CONFIG_64BIT
if (!kbase_ctx_flag(kctx, KCTX_COMPAT)) {
/* 64-bit tasks must MMAP anyway, but not expose this address to
* clients */
*flags |= BASE_MEM_NEED_MMAP;
reg = kbase_alloc_free_region(kctx, 0, *num_pages,
KBASE_REG_ZONE_SAME_VA);
} else {
#else
if (1) {
#endif
reg = kbase_alloc_free_region(kctx, 0, *num_pages,
KBASE_REG_ZONE_CUSTOM_VA);
}
if (!reg)
goto no_reg;
/* zero-sized page array, as we don't need one/can support one */
reg->gpu_alloc = kbase_alloc_create(0, KBASE_MEM_TYPE_ALIAS);
if (IS_ERR_OR_NULL(reg->gpu_alloc))
goto no_alloc_obj;
reg->cpu_alloc = kbase_mem_phy_alloc_get(reg->gpu_alloc);
if (kbase_update_region_flags(kctx, reg, *flags) != 0)
goto invalid_flags;
reg->gpu_alloc->imported.alias.nents = nents;
reg->gpu_alloc->imported.alias.stride = stride;
reg->gpu_alloc->imported.alias.aliased = vzalloc(sizeof(*reg->gpu_alloc->imported.alias.aliased) * nents);
if (!reg->gpu_alloc->imported.alias.aliased)
goto no_aliased_array;
kbase_gpu_vm_lock(kctx);
/* validate and add src handles */
for (i = 0; i < nents; i++) {
if (ai[i].handle.basep.handle < BASE_MEM_FIRST_FREE_ADDRESS) {
if (ai[i].handle.basep.handle !=
BASEP_MEM_WRITE_ALLOC_PAGES_HANDLE)
goto bad_handle; /* unsupported magic handle */
if (!ai[i].length)
goto bad_handle; /* must be > 0 */
if (ai[i].length > stride)
goto bad_handle; /* can't be larger than the
stride */
reg->gpu_alloc->imported.alias.aliased[i].length = ai[i].length;
} else {
struct kbase_va_region *aliasing_reg;
struct kbase_mem_phy_alloc *alloc;
aliasing_reg = kbase_region_tracker_find_region_base_address(
kctx,
(ai[i].handle.basep.handle >> PAGE_SHIFT) << PAGE_SHIFT);
/* validate found region */
if (!aliasing_reg)
goto bad_handle; /* Not found */
if (aliasing_reg->flags & KBASE_REG_FREE)
goto bad_handle; /* Free region */
if (aliasing_reg->flags & KBASE_REG_DONT_NEED)
goto bad_handle; /* Ephemeral region */
if (!aliasing_reg->gpu_alloc)
goto bad_handle; /* No alloc */
if (aliasing_reg->gpu_alloc->type != KBASE_MEM_TYPE_NATIVE)
goto bad_handle; /* Not a native alloc */
if (coherent != ((aliasing_reg->flags & KBASE_REG_SHARE_BOTH) != 0))
goto bad_handle;
/* Non-coherent memory cannot alias
coherent memory, and vice versa.*/
/* check size against stride */
if (!ai[i].length)
goto bad_handle; /* must be > 0 */
if (ai[i].length > stride)
goto bad_handle; /* can't be larger than the
stride */
alloc = aliasing_reg->gpu_alloc;
/* check against the alloc's size */
if (ai[i].offset > alloc->nents)
goto bad_handle; /* beyond end */
if (ai[i].offset + ai[i].length > alloc->nents)
goto bad_handle; /* beyond end */
reg->gpu_alloc->imported.alias.aliased[i].alloc = kbase_mem_phy_alloc_get(alloc);
reg->gpu_alloc->imported.alias.aliased[i].length = ai[i].length;
reg->gpu_alloc->imported.alias.aliased[i].offset = ai[i].offset;
}
}
#ifdef CONFIG_64BIT
if (!kbase_ctx_flag(kctx, KCTX_COMPAT)) {
/* Bind to a cookie */
if (!kctx->cookies) {
dev_err(kctx->kbdev->dev, "No cookies available for allocation!");
goto no_cookie;
}
/* return a cookie */
gpu_va = __ffs(kctx->cookies);
kctx->cookies &= ~(1UL << gpu_va);
BUG_ON(kctx->pending_regions[gpu_va]);
kctx->pending_regions[gpu_va] = reg;
/* relocate to correct base */
gpu_va += PFN_DOWN(BASE_MEM_COOKIE_BASE);
gpu_va <<= PAGE_SHIFT;
} else /* we control the VA */ {
#else
if (1) {
#endif
if (kbase_gpu_mmap(kctx, reg, 0, *num_pages, 1) != 0) {
dev_warn(kctx->kbdev->dev, "Failed to map memory on GPU");
goto no_mmap;
}
/* return real GPU VA */
gpu_va = reg->start_pfn << PAGE_SHIFT;
}
reg->flags &= ~KBASE_REG_FREE;
reg->flags &= ~KBASE_REG_GROWABLE;
kbase_gpu_vm_unlock(kctx);
return gpu_va;
#ifdef CONFIG_64BIT
no_cookie:
#endif
no_mmap:
bad_handle:
kbase_gpu_vm_unlock(kctx);
no_aliased_array:
invalid_flags:
kbase_mem_phy_alloc_put(reg->cpu_alloc);
kbase_mem_phy_alloc_put(reg->gpu_alloc);
no_alloc_obj:
kfree(reg);
no_reg:
bad_size:
bad_nents:
bad_stride:
bad_flags:
return 0;
}
int kbase_mem_import(struct kbase_context *kctx, enum base_mem_import_type type,
void __user *phandle, u32 padding, u64 *gpu_va, u64 *va_pages,
u64 *flags)
{
struct kbase_va_region *reg;
KBASE_DEBUG_ASSERT(kctx);
KBASE_DEBUG_ASSERT(gpu_va);
KBASE_DEBUG_ASSERT(va_pages);
KBASE_DEBUG_ASSERT(flags);
if ((!kbase_ctx_flag(kctx, KCTX_COMPAT)) &&
kbase_ctx_flag(kctx, KCTX_FORCE_SAME_VA))
*flags |= BASE_MEM_SAME_VA;
if (!kbase_check_import_flags(*flags)) {
dev_warn(kctx->kbdev->dev,
"kbase_mem_import called with bad flags (%llx)",
(unsigned long long)*flags);
goto bad_flags;
}
if ((*flags & BASE_MEM_COHERENT_SYSTEM_REQUIRED) != 0 &&
!kbase_device_is_cpu_coherent(kctx->kbdev)) {
dev_warn(kctx->kbdev->dev,
"kbase_mem_import call required coherent mem when unavailable");
goto bad_flags;
}
if ((*flags & BASE_MEM_COHERENT_SYSTEM) != 0 &&
!kbase_device_is_cpu_coherent(kctx->kbdev)) {
/* Remove COHERENT_SYSTEM flag if coherent mem is unavailable */
*flags &= ~BASE_MEM_COHERENT_SYSTEM;
}
if ((padding != 0) && (type != BASE_MEM_IMPORT_TYPE_UMM)) {
dev_warn(kctx->kbdev->dev,
"padding is only supported for UMM");
goto bad_flags;
}
switch (type) {
#ifdef CONFIG_DMA_SHARED_BUFFER
case BASE_MEM_IMPORT_TYPE_UMM: {
int fd;
if (get_user(fd, (int __user *)phandle))
reg = NULL;
else
reg = kbase_mem_from_umm(kctx, fd, va_pages, flags,
padding);
}
break;
#endif /* CONFIG_DMA_SHARED_BUFFER */
case BASE_MEM_IMPORT_TYPE_USER_BUFFER: {
struct base_mem_import_user_buffer user_buffer;
void __user *uptr;
if (copy_from_user(&user_buffer, phandle,
sizeof(user_buffer))) {
reg = NULL;
} else {
#ifdef CONFIG_COMPAT
if (kbase_ctx_flag(kctx, KCTX_COMPAT))
uptr = compat_ptr(user_buffer.ptr);
else
#endif
uptr = u64_to_user_ptr(user_buffer.ptr);
reg = kbase_mem_from_user_buffer(kctx,
(unsigned long)uptr, user_buffer.length,
va_pages, flags);
}
break;
}
default: {
reg = NULL;
break;
}
}
if (!reg)
goto no_reg;
kbase_gpu_vm_lock(kctx);
/* mmap needed to setup VA? */
if (*flags & (BASE_MEM_SAME_VA | BASE_MEM_NEED_MMAP)) {
/* Bind to a cookie */
if (!kctx->cookies)
goto no_cookie;
/* return a cookie */
*gpu_va = __ffs(kctx->cookies);
kctx->cookies &= ~(1UL << *gpu_va);
BUG_ON(kctx->pending_regions[*gpu_va]);
kctx->pending_regions[*gpu_va] = reg;
/* relocate to correct base */
*gpu_va += PFN_DOWN(BASE_MEM_COOKIE_BASE);
*gpu_va <<= PAGE_SHIFT;
} else if (*flags & KBASE_MEM_IMPORT_HAVE_PAGES) {
/* we control the VA, mmap now to the GPU */
if (kbase_gpu_mmap(kctx, reg, 0, *va_pages, 1) != 0)
goto no_gpu_va;
/* return real GPU VA */
*gpu_va = reg->start_pfn << PAGE_SHIFT;
} else {
/* we control the VA, but nothing to mmap yet */
if (kbase_add_va_region(kctx, reg, 0, *va_pages, 1) != 0)
goto no_gpu_va;
/* return real GPU VA */
*gpu_va = reg->start_pfn << PAGE_SHIFT;
}
/* clear out private flags */
*flags &= ((1UL << BASE_MEM_FLAGS_NR_BITS) - 1);
kbase_gpu_vm_unlock(kctx);
return 0;
no_gpu_va:
no_cookie:
kbase_gpu_vm_unlock(kctx);
kbase_mem_phy_alloc_put(reg->cpu_alloc);
kbase_mem_phy_alloc_put(reg->gpu_alloc);
kfree(reg);
no_reg:
bad_flags:
*gpu_va = 0;
*va_pages = 0;
*flags = 0;
return -ENOMEM;
}
int kbase_mem_grow_gpu_mapping(struct kbase_context *kctx,
struct kbase_va_region *reg,
u64 new_pages, u64 old_pages)
{
struct tagged_addr *phy_pages;
u64 delta = new_pages - old_pages;
int ret = 0;
lockdep_assert_held(&kctx->reg_lock);
/* Map the new pages into the GPU */
phy_pages = kbase_get_gpu_phy_pages(reg);
ret = kbase_mmu_insert_pages(kctx, reg->start_pfn + old_pages,
phy_pages + old_pages, delta, reg->flags);
return ret;
}
void kbase_mem_shrink_cpu_mapping(struct kbase_context *kctx,
struct kbase_va_region *reg,
u64 new_pages, u64 old_pages)
{
u64 gpu_va_start = reg->start_pfn;
if (new_pages == old_pages)
/* Nothing to do */
return;
unmap_mapping_range(kctx->filp->f_inode->i_mapping,
(gpu_va_start + new_pages)<<PAGE_SHIFT,
(old_pages - new_pages)<<PAGE_SHIFT, 1);
}
int kbase_mem_shrink_gpu_mapping(struct kbase_context *kctx,
struct kbase_va_region *reg,
u64 new_pages, u64 old_pages)
{
u64 delta = old_pages - new_pages;
int ret = 0;
ret = kbase_mmu_teardown_pages(kctx,
reg->start_pfn + new_pages, delta);
return ret;
}
int kbase_mem_commit(struct kbase_context *kctx, u64 gpu_addr, u64 new_pages)
{
u64 old_pages;
u64 delta;
int res = -EINVAL;
struct kbase_va_region *reg;
bool read_locked = false;
KBASE_DEBUG_ASSERT(kctx);
KBASE_DEBUG_ASSERT(gpu_addr != 0);
if (gpu_addr & ~PAGE_MASK) {
dev_warn(kctx->kbdev->dev, "kbase:mem_commit: gpu_addr: passed parameter is invalid");
return -EINVAL;
}
down_write(&current->mm->mmap_sem);
kbase_gpu_vm_lock(kctx);
/* Validate the region */
reg = kbase_region_tracker_find_region_base_address(kctx, gpu_addr);
if (!reg || (reg->flags & KBASE_REG_FREE))
goto out_unlock;
KBASE_DEBUG_ASSERT(reg->cpu_alloc);
KBASE_DEBUG_ASSERT(reg->gpu_alloc);
if (reg->gpu_alloc->type != KBASE_MEM_TYPE_NATIVE)
goto out_unlock;
if (0 == (reg->flags & KBASE_REG_GROWABLE))
goto out_unlock;
/* Would overflow the VA region */
if (new_pages > reg->nr_pages)
goto out_unlock;
/* can't be mapped more than once on the GPU */
if (atomic_read(&reg->gpu_alloc->gpu_mappings) > 1)
goto out_unlock;
/* can't grow regions which are ephemeral */
if (reg->flags & KBASE_REG_DONT_NEED)
goto out_unlock;
if (new_pages == reg->gpu_alloc->nents) {
/* no change */
res = 0;
goto out_unlock;
}
old_pages = kbase_reg_current_backed_size(reg);
if (new_pages > old_pages) {
delta = new_pages - old_pages;
/*
* No update to the mm so downgrade the writer lock to a read
* lock so other readers aren't blocked after this point.
*/
downgrade_write(&current->mm->mmap_sem);
read_locked = true;
/* Allocate some more pages */
if (kbase_alloc_phy_pages_helper(reg->cpu_alloc, delta) != 0) {
res = -ENOMEM;
goto out_unlock;
}
if (reg->cpu_alloc != reg->gpu_alloc) {
if (kbase_alloc_phy_pages_helper(
reg->gpu_alloc, delta) != 0) {
res = -ENOMEM;
kbase_free_phy_pages_helper(reg->cpu_alloc,
delta);
goto out_unlock;
}
}
/* No update required for CPU mappings, that's done on fault. */
/* Update GPU mapping. */
res = kbase_mem_grow_gpu_mapping(kctx, reg,
new_pages, old_pages);
/* On error free the new pages */
if (res) {
kbase_free_phy_pages_helper(reg->cpu_alloc, delta);
if (reg->cpu_alloc != reg->gpu_alloc)
kbase_free_phy_pages_helper(reg->gpu_alloc,
delta);
res = -ENOMEM;
goto out_unlock;
}
} else {
delta = old_pages - new_pages;
/* Update all CPU mapping(s) */
kbase_mem_shrink_cpu_mapping(kctx, reg,
new_pages, old_pages);
/* Update the GPU mapping */
res = kbase_mem_shrink_gpu_mapping(kctx, reg,
new_pages, old_pages);
if (res) {
res = -ENOMEM;
goto out_unlock;
}
kbase_free_phy_pages_helper(reg->cpu_alloc, delta);
if (reg->cpu_alloc != reg->gpu_alloc)
kbase_free_phy_pages_helper(reg->gpu_alloc, delta);
}
out_unlock:
kbase_gpu_vm_unlock(kctx);
if (read_locked)
up_read(&current->mm->mmap_sem);
else
up_write(&current->mm->mmap_sem);
return res;
}
static void kbase_cpu_vm_open(struct vm_area_struct *vma)
{
struct kbase_cpu_mapping *map = vma->vm_private_data;
KBASE_DEBUG_ASSERT(map);
KBASE_DEBUG_ASSERT(map->count > 0);
/* non-atomic as we're under Linux' mm lock */
map->count++;
}
static void kbase_cpu_vm_close(struct vm_area_struct *vma)
{
struct kbase_cpu_mapping *map = vma->vm_private_data;
KBASE_DEBUG_ASSERT(map);
KBASE_DEBUG_ASSERT(map->count > 0);
/* non-atomic as we're under Linux' mm lock */
if (--map->count)
return;
KBASE_DEBUG_ASSERT(map->kctx);
KBASE_DEBUG_ASSERT(map->alloc);
kbase_gpu_vm_lock(map->kctx);
if (map->free_on_close) {
KBASE_DEBUG_ASSERT((map->region->flags & KBASE_REG_ZONE_MASK) ==
KBASE_REG_ZONE_SAME_VA);
/* Avoid freeing memory on the process death which results in
* GPU Page Fault. Memory will be freed in kbase_destroy_context
*/
if (!(current->flags & PF_EXITING))
kbase_mem_free_region(map->kctx, map->region);
}
list_del(&map->mappings_list);
kbase_gpu_vm_unlock(map->kctx);
kbase_mem_phy_alloc_put(map->alloc);
kfree(map);
}
KBASE_EXPORT_TEST_API(kbase_cpu_vm_close);
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0))
static int kbase_cpu_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
#else
static int kbase_cpu_vm_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
#endif
struct kbase_cpu_mapping *map = vma->vm_private_data;
pgoff_t rel_pgoff;
size_t i;
pgoff_t addr;
KBASE_DEBUG_ASSERT(map);
KBASE_DEBUG_ASSERT(map->count > 0);
KBASE_DEBUG_ASSERT(map->kctx);
KBASE_DEBUG_ASSERT(map->alloc);
rel_pgoff = vmf->pgoff - map->region->start_pfn;
kbase_gpu_vm_lock(map->kctx);
if (rel_pgoff >= map->alloc->nents)
goto locked_bad_fault;
/* Fault on access to DONT_NEED regions */
if (map->alloc->reg && (map->alloc->reg->flags & KBASE_REG_DONT_NEED))
goto locked_bad_fault;
/* insert all valid pages from the fault location */
i = rel_pgoff;
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0))
addr = (pgoff_t)((uintptr_t)vmf->virtual_address >> PAGE_SHIFT);
#else
addr = (pgoff_t)(vmf->address >> PAGE_SHIFT);
#endif
while (i < map->alloc->nents && (addr < vma->vm_end >> PAGE_SHIFT)) {
int ret = vm_insert_pfn(vma, addr << PAGE_SHIFT,
PFN_DOWN(as_phys_addr_t(map->alloc->pages[i])));
if (ret < 0 && ret != -EBUSY)
goto locked_bad_fault;
i++; addr++;
}
kbase_gpu_vm_unlock(map->kctx);
/* we resolved it, nothing for VM to do */
return VM_FAULT_NOPAGE;
locked_bad_fault:
kbase_gpu_vm_unlock(map->kctx);
return VM_FAULT_SIGBUS;
}
const struct vm_operations_struct kbase_vm_ops = {
.open = kbase_cpu_vm_open,
.close = kbase_cpu_vm_close,
.fault = kbase_cpu_vm_fault
};
static int kbase_cpu_mmap(struct kbase_va_region *reg, struct vm_area_struct *vma, void *kaddr, size_t nr_pages, unsigned long aligned_offset, int free_on_close)
{
struct kbase_cpu_mapping *map;
struct tagged_addr *page_array;
int err = 0;
int i;
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (!map) {
WARN_ON(1);
err = -ENOMEM;
goto out;
}
/*
* VM_DONTCOPY - don't make this mapping available in fork'ed processes
* VM_DONTEXPAND - disable mremap on this region
* VM_IO - disables paging
* VM_DONTDUMP - Don't include in core dumps (3.7 only)
* VM_MIXEDMAP - Support mixing struct page*s and raw pfns.
* This is needed to support using the dedicated and
* the OS based memory backends together.
*/
/*
* This will need updating to propagate coherency flags
* See MIDBASE-1057
*/
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0))
vma->vm_flags |= VM_DONTCOPY | VM_DONTDUMP | VM_DONTEXPAND | VM_IO;
#else
vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_RESERVED | VM_IO;
#endif
vma->vm_ops = &kbase_vm_ops;
vma->vm_private_data = map;
page_array = kbase_get_cpu_phy_pages(reg);
if (!(reg->flags & KBASE_REG_CPU_CACHED) &&
(reg->flags & (KBASE_REG_CPU_WR|KBASE_REG_CPU_RD))) {
/* We can't map vmalloc'd memory uncached.
* Other memory will have been returned from
* kbase_mem_pool which would be
* suitable for mapping uncached.
*/
BUG_ON(kaddr);
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
}
if (!kaddr) {
unsigned long addr = vma->vm_start + aligned_offset;
u64 start_off = vma->vm_pgoff - reg->start_pfn +
(aligned_offset>>PAGE_SHIFT);
vma->vm_flags |= VM_PFNMAP;
for (i = 0; i < nr_pages; i++) {
phys_addr_t phys;
phys = as_phys_addr_t(page_array[i + start_off]);
err = vm_insert_pfn(vma, addr, PFN_DOWN(phys));
if (WARN_ON(err))
break;
addr += PAGE_SIZE;
}
} else {
WARN_ON(aligned_offset);
/* MIXEDMAP so we can vfree the kaddr early and not track it after map time */
vma->vm_flags |= VM_MIXEDMAP;
/* vmalloc remaping is easy... */
err = remap_vmalloc_range(vma, kaddr, 0);
WARN_ON(err);
}
if (err) {
kfree(map);
goto out;
}
map->region = reg;
map->free_on_close = free_on_close;
map->kctx = reg->kctx;
map->alloc = kbase_mem_phy_alloc_get(reg->cpu_alloc);
map->count = 1; /* start with one ref */
if (reg->flags & KBASE_REG_CPU_CACHED)
map->alloc->properties |= KBASE_MEM_PHY_ALLOC_ACCESSED_CACHED;
list_add(&map->mappings_list, &map->alloc->mappings);
out:
return err;
}
static int kbase_trace_buffer_mmap(struct kbase_context *kctx, struct vm_area_struct *vma, struct kbase_va_region **const reg, void **const kaddr)
{
struct kbase_va_region *new_reg;
u32 nr_pages;
size_t size;
int err = 0;
u32 *tb;
int owns_tb = 1;
dev_dbg(kctx->kbdev->dev, "in %s\n", __func__);
size = (vma->vm_end - vma->vm_start);
nr_pages = size >> PAGE_SHIFT;
if (!kctx->jctx.tb) {
KBASE_DEBUG_ASSERT(0 != size);
tb = vmalloc_user(size);
if (NULL == tb) {
err = -ENOMEM;
goto out;
}
err = kbase_device_trace_buffer_install(kctx, tb, size);
if (err) {
vfree(tb);
goto out;
}
} else {
err = -EINVAL;
goto out;
}
*kaddr = kctx->jctx.tb;
new_reg = kbase_alloc_free_region(kctx, 0, nr_pages, KBASE_REG_ZONE_SAME_VA);
if (!new_reg) {
err = -ENOMEM;
WARN_ON(1);
goto out_no_region;
}
new_reg->cpu_alloc = kbase_alloc_create(0, KBASE_MEM_TYPE_TB);
if (IS_ERR_OR_NULL(new_reg->cpu_alloc)) {
err = -ENOMEM;
new_reg->cpu_alloc = NULL;
WARN_ON(1);
goto out_no_alloc;
}
new_reg->gpu_alloc = kbase_mem_phy_alloc_get(new_reg->cpu_alloc);
new_reg->cpu_alloc->imported.kctx = kctx;
new_reg->flags &= ~KBASE_REG_FREE;
new_reg->flags |= KBASE_REG_CPU_CACHED;
/* alloc now owns the tb */
owns_tb = 0;
if (kbase_add_va_region(kctx, new_reg, vma->vm_start, nr_pages, 1) != 0) {
err = -ENOMEM;
WARN_ON(1);
goto out_no_va_region;
}
*reg = new_reg;
/* map read only, noexec */
vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE | VM_EXEC | VM_MAYEXEC);
/* the rest of the flags is added by the cpu_mmap handler */
dev_dbg(kctx->kbdev->dev, "%s done\n", __func__);
return 0;
out_no_va_region:
out_no_alloc:
kbase_free_alloced_region(new_reg);
out_no_region:
if (owns_tb) {
kbase_device_trace_buffer_uninstall(kctx);
vfree(tb);
}
out:
return err;
}
static int kbase_mmu_dump_mmap(struct kbase_context *kctx, struct vm_area_struct *vma, struct kbase_va_region **const reg, void **const kmap_addr)
{
struct kbase_va_region *new_reg;
void *kaddr;
u32 nr_pages;
size_t size;
int err = 0;
dev_dbg(kctx->kbdev->dev, "in kbase_mmu_dump_mmap\n");
size = (vma->vm_end - vma->vm_start);
nr_pages = size >> PAGE_SHIFT;
kaddr = kbase_mmu_dump(kctx, nr_pages);
if (!kaddr) {
err = -ENOMEM;
goto out;
}
new_reg = kbase_alloc_free_region(kctx, 0, nr_pages, KBASE_REG_ZONE_SAME_VA);
if (!new_reg) {
err = -ENOMEM;
WARN_ON(1);
goto out;
}
new_reg->cpu_alloc = kbase_alloc_create(0, KBASE_MEM_TYPE_RAW);
if (IS_ERR_OR_NULL(new_reg->cpu_alloc)) {
err = -ENOMEM;
new_reg->cpu_alloc = NULL;
WARN_ON(1);
goto out_no_alloc;
}
new_reg->gpu_alloc = kbase_mem_phy_alloc_get(new_reg->cpu_alloc);
new_reg->flags &= ~KBASE_REG_FREE;
new_reg->flags |= KBASE_REG_CPU_CACHED;
if (kbase_add_va_region(kctx, new_reg, vma->vm_start, nr_pages, 1) != 0) {
err = -ENOMEM;
WARN_ON(1);
goto out_va_region;
}
*kmap_addr = kaddr;
*reg = new_reg;
dev_dbg(kctx->kbdev->dev, "kbase_mmu_dump_mmap done\n");
return 0;
out_no_alloc:
out_va_region:
kbase_free_alloced_region(new_reg);
out:
return err;
}
void kbase_os_mem_map_lock(struct kbase_context *kctx)
{
struct mm_struct *mm = current->mm;
(void)kctx;
down_read(&mm->mmap_sem);
}
void kbase_os_mem_map_unlock(struct kbase_context *kctx)
{
struct mm_struct *mm = current->mm;
(void)kctx;
up_read(&mm->mmap_sem);
}
static int kbasep_reg_mmap(struct kbase_context *kctx,
struct vm_area_struct *vma,
struct kbase_va_region **regm,
size_t *nr_pages, size_t *aligned_offset)
{
int cookie = vma->vm_pgoff - PFN_DOWN(BASE_MEM_COOKIE_BASE);
struct kbase_va_region *reg;
int err = 0;
*aligned_offset = 0;
dev_dbg(kctx->kbdev->dev, "in kbasep_reg_mmap\n");
/* SAME_VA stuff, fetch the right region */
reg = kctx->pending_regions[cookie];
if (!reg) {
err = -ENOMEM;
goto out;
}
if ((reg->flags & KBASE_REG_GPU_NX) && (reg->nr_pages != *nr_pages)) {
/* incorrect mmap size */
/* leave the cookie for a potential later
* mapping, or to be reclaimed later when the
* context is freed */
err = -ENOMEM;
goto out;
}
if ((vma->vm_flags & VM_READ && !(reg->flags & KBASE_REG_CPU_RD)) ||
(vma->vm_flags & VM_WRITE && !(reg->flags & KBASE_REG_CPU_WR))) {
/* VM flags inconsistent with region flags */
err = -EPERM;
dev_err(kctx->kbdev->dev, "%s:%d inconsistent VM flags\n",
__FILE__, __LINE__);
goto out;
}
/* adjust down nr_pages to what we have physically */
*nr_pages = kbase_reg_current_backed_size(reg);
if (kbase_gpu_mmap(kctx, reg, vma->vm_start + *aligned_offset,
reg->nr_pages, 1) != 0) {
dev_err(kctx->kbdev->dev, "%s:%d\n", __FILE__, __LINE__);
/* Unable to map in GPU space. */
WARN_ON(1);
err = -ENOMEM;
goto out;
}
/* no need for the cookie anymore */
kctx->pending_regions[cookie] = NULL;
kctx->cookies |= (1UL << cookie);
/*
* Overwrite the offset with the region start_pfn, so we effectively
* map from offset 0 in the region. However subtract the aligned
* offset so that when user space trims the mapping the beginning of
* the trimmed VMA has the correct vm_pgoff;
*/
vma->vm_pgoff = reg->start_pfn - ((*aligned_offset)>>PAGE_SHIFT);
out:
*regm = reg;
dev_dbg(kctx->kbdev->dev, "kbasep_reg_mmap done\n");
return err;
}
int kbase_mmap(struct file *file, struct vm_area_struct *vma)
{
struct kbase_context *kctx = file->private_data;
struct kbase_va_region *reg = NULL;
void *kaddr = NULL;
size_t nr_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
int err = 0;
int free_on_close = 0;
struct device *dev = kctx->kbdev->dev;
size_t aligned_offset = 0;
dev_dbg(dev, "kbase_mmap\n");
if (!(vma->vm_flags & VM_READ))
vma->vm_flags &= ~VM_MAYREAD;
if (!(vma->vm_flags & VM_WRITE))
vma->vm_flags &= ~VM_MAYWRITE;
if (0 == nr_pages) {
err = -EINVAL;
goto out;
}
if (!(vma->vm_flags & VM_SHARED)) {
err = -EINVAL;
goto out;
}
kbase_gpu_vm_lock(kctx);
if (vma->vm_pgoff == PFN_DOWN(BASE_MEM_MAP_TRACKING_HANDLE)) {
/* The non-mapped tracking helper page */
err = kbase_tracking_page_setup(kctx, vma);
goto out_unlock;
}
/* if not the MTP, verify that the MTP has been mapped */
rcu_read_lock();
/* catches both when the special page isn't present or
* when we've forked */
if (rcu_dereference(kctx->process_mm) != current->mm) {
err = -EINVAL;
rcu_read_unlock();
goto out_unlock;
}
rcu_read_unlock();
switch (vma->vm_pgoff) {
case PFN_DOWN(BASEP_MEM_INVALID_HANDLE):
case PFN_DOWN(BASEP_MEM_WRITE_ALLOC_PAGES_HANDLE):
/* Illegal handle for direct map */
err = -EINVAL;
goto out_unlock;
case PFN_DOWN(BASE_MEM_TRACE_BUFFER_HANDLE):
err = kbase_trace_buffer_mmap(kctx, vma, &reg, &kaddr);
if (0 != err)
goto out_unlock;
dev_dbg(dev, "kbase_trace_buffer_mmap ok\n");
/* free the region on munmap */
free_on_close = 1;
break;
case PFN_DOWN(BASE_MEM_MMU_DUMP_HANDLE):
/* MMU dump */
err = kbase_mmu_dump_mmap(kctx, vma, &reg, &kaddr);
if (0 != err)
goto out_unlock;
/* free the region on munmap */
free_on_close = 1;
break;
case PFN_DOWN(BASE_MEM_COOKIE_BASE) ...
PFN_DOWN(BASE_MEM_FIRST_FREE_ADDRESS) - 1: {
err = kbasep_reg_mmap(kctx, vma, &reg, &nr_pages,
&aligned_offset);
if (0 != err)
goto out_unlock;
/* free the region on munmap */
free_on_close = 1;
break;
}
default: {
reg = kbase_region_tracker_find_region_enclosing_address(kctx,
(u64)vma->vm_pgoff << PAGE_SHIFT);
if (reg && !(reg->flags & KBASE_REG_FREE)) {
/* will this mapping overflow the size of the region? */
if (nr_pages > (reg->nr_pages -
(vma->vm_pgoff - reg->start_pfn))) {
err = -ENOMEM;
goto out_unlock;
}
if ((vma->vm_flags & VM_READ &&
!(reg->flags & KBASE_REG_CPU_RD)) ||
(vma->vm_flags & VM_WRITE &&
!(reg->flags & KBASE_REG_CPU_WR))) {
/* VM flags inconsistent with region flags */
err = -EPERM;
dev_err(dev, "%s:%d inconsistent VM flags\n",
__FILE__, __LINE__);
goto out_unlock;
}
#ifdef CONFIG_DMA_SHARED_BUFFER
if (KBASE_MEM_TYPE_IMPORTED_UMM ==
reg->cpu_alloc->type) {
if (0 != (vma->vm_pgoff - reg->start_pfn)) {
err = -EINVAL;
dev_warn(dev, "%s:%d attempt to do a partial map in a dma_buf: non-zero offset to dma_buf mapping!\n",
__FILE__, __LINE__);
goto out_unlock;
}
err = dma_buf_mmap(
reg->cpu_alloc->imported.umm.dma_buf,
vma, vma->vm_pgoff - reg->start_pfn);
goto out_unlock;
}
#endif /* CONFIG_DMA_SHARED_BUFFER */
/* limit what we map to the amount currently backed */
if (reg->cpu_alloc->nents < (vma->vm_pgoff - reg->start_pfn + nr_pages)) {
if ((vma->vm_pgoff - reg->start_pfn) >= reg->cpu_alloc->nents)
nr_pages = 0;
else
nr_pages = reg->cpu_alloc->nents - (vma->vm_pgoff - reg->start_pfn);
}
} else {
err = -ENOMEM;
goto out_unlock;
}
} /* default */
} /* switch */
err = kbase_cpu_mmap(reg, vma, kaddr, nr_pages, aligned_offset, free_on_close);
if (vma->vm_pgoff == PFN_DOWN(BASE_MEM_MMU_DUMP_HANDLE)) {
/* MMU dump - userspace should now have a reference on
* the pages, so we can now free the kernel mapping */
vfree(kaddr);
}
out_unlock:
kbase_gpu_vm_unlock(kctx);
out:
if (err)
dev_err(dev, "mmap failed %d\n", err);
return err;
}
KBASE_EXPORT_TEST_API(kbase_mmap);
static void kbasep_sync_mem_regions(struct kbase_context *kctx,
struct kbase_vmap_struct *map, enum kbase_sync_type dest)
{
size_t i;
off_t const offset = (uintptr_t)map->gpu_addr & ~PAGE_MASK;
size_t const page_count = PFN_UP(offset + map->size);
/* Sync first page */
size_t sz = MIN(((size_t) PAGE_SIZE - offset), map->size);
struct tagged_addr cpu_pa = map->cpu_pages[0];
struct tagged_addr gpu_pa = map->gpu_pages[0];
kbase_sync_single(kctx, cpu_pa, gpu_pa, offset, sz, dest);
/* Sync middle pages (if any) */
for (i = 1; page_count > 2 && i < page_count - 1; i++) {
cpu_pa = map->cpu_pages[i];
gpu_pa = map->gpu_pages[i];
kbase_sync_single(kctx, cpu_pa, gpu_pa, 0, PAGE_SIZE, dest);
}
/* Sync last page (if any) */
if (page_count > 1) {
cpu_pa = map->cpu_pages[page_count - 1];
gpu_pa = map->gpu_pages[page_count - 1];
sz = ((offset + map->size - 1) & ~PAGE_MASK) + 1;
kbase_sync_single(kctx, cpu_pa, gpu_pa, 0, sz, dest);
}
}
void *kbase_vmap_prot(struct kbase_context *kctx, u64 gpu_addr, size_t size,
unsigned long prot_request, struct kbase_vmap_struct *map)
{
struct kbase_va_region *reg;
unsigned long page_index;
unsigned int offset = gpu_addr & ~PAGE_MASK;
size_t page_count = PFN_UP(offset + size);
struct tagged_addr *page_array;
struct page **pages;
void *cpu_addr = NULL;
pgprot_t prot;
size_t i;
if (!size || !map)
return NULL;
/* check if page_count calculation will wrap */
if (size > ((size_t)-1 / PAGE_SIZE))
return NULL;
kbase_gpu_vm_lock(kctx);
reg = kbase_region_tracker_find_region_enclosing_address(kctx, gpu_addr);
if (!reg || (reg->flags & KBASE_REG_FREE))
goto out_unlock;
page_index = (gpu_addr >> PAGE_SHIFT) - reg->start_pfn;
/* check if page_index + page_count will wrap */
if (-1UL - page_count < page_index)
goto out_unlock;
if (page_index + page_count > kbase_reg_current_backed_size(reg))
goto out_unlock;
if (reg->flags & KBASE_REG_DONT_NEED)
goto out_unlock;
/* check access permissions can be satisfied
* Intended only for checking KBASE_REG_{CPU,GPU}_{RD,WR} */
if ((reg->flags & prot_request) != prot_request)
goto out_unlock;
page_array = kbase_get_cpu_phy_pages(reg);
if (!page_array)
goto out_unlock;
pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL);
if (!pages)
goto out_unlock;
for (i = 0; i < page_count; i++)
pages[i] = phys_to_page(as_phys_addr_t(page_array[page_index +
i]));
prot = PAGE_KERNEL;
if (!(reg->flags & KBASE_REG_CPU_CACHED)) {
/* Map uncached */
prot = pgprot_writecombine(prot);
}
/* Note: enforcing a RO prot_request onto prot is not done, since:
* - CPU-arch-specific integration required
* - kbase_vmap() requires no access checks to be made/enforced */
cpu_addr = vmap(pages, page_count, VM_MAP, prot);
kfree(pages);
if (!cpu_addr)
goto out_unlock;
map->gpu_addr = gpu_addr;
map->cpu_alloc = kbase_mem_phy_alloc_get(reg->cpu_alloc);
map->cpu_pages = &kbase_get_cpu_phy_pages(reg)[page_index];
map->gpu_alloc = kbase_mem_phy_alloc_get(reg->gpu_alloc);
map->gpu_pages = &kbase_get_gpu_phy_pages(reg)[page_index];
map->addr = (void *)((uintptr_t)cpu_addr + offset);
map->size = size;
map->sync_needed = ((reg->flags & KBASE_REG_CPU_CACHED) != 0) &&
!kbase_mem_is_imported(map->gpu_alloc->type);
if (map->sync_needed)
kbasep_sync_mem_regions(kctx, map, KBASE_SYNC_TO_CPU);
kbase_gpu_vm_unlock(kctx);
return map->addr;
out_unlock:
kbase_gpu_vm_unlock(kctx);
return NULL;
}
void *kbase_vmap(struct kbase_context *kctx, u64 gpu_addr, size_t size,
struct kbase_vmap_struct *map)
{
/* 0 is specified for prot_request to indicate no access checks should
* be made.
*
* As mentioned in kbase_vmap_prot() this means that a kernel-side
* CPU-RO mapping is not enforced to allow this to work */
return kbase_vmap_prot(kctx, gpu_addr, size, 0u, map);
}
KBASE_EXPORT_TEST_API(kbase_vmap);
void kbase_vunmap(struct kbase_context *kctx, struct kbase_vmap_struct *map)
{
void *addr = (void *)((uintptr_t)map->addr & PAGE_MASK);
vunmap(addr);
if (map->sync_needed)
kbasep_sync_mem_regions(kctx, map, KBASE_SYNC_TO_DEVICE);
map->gpu_addr = 0;
map->cpu_alloc = kbase_mem_phy_alloc_put(map->cpu_alloc);
map->gpu_alloc = kbase_mem_phy_alloc_put(map->gpu_alloc);
map->cpu_pages = NULL;
map->gpu_pages = NULL;
map->addr = NULL;
map->size = 0;
map->sync_needed = false;
}
KBASE_EXPORT_TEST_API(kbase_vunmap);
void kbasep_os_process_page_usage_update(struct kbase_context *kctx, int pages)
{
struct mm_struct *mm;
rcu_read_lock();
mm = rcu_dereference(kctx->process_mm);
if (mm) {
atomic_add(pages, &kctx->nonmapped_pages);
#ifdef SPLIT_RSS_COUNTING
add_mm_counter(mm, MM_FILEPAGES, pages);
#else
spin_lock(&mm->page_table_lock);
add_mm_counter(mm, MM_FILEPAGES, pages);
spin_unlock(&mm->page_table_lock);
#endif
}
rcu_read_unlock();
}
static void kbasep_os_process_page_usage_drain(struct kbase_context *kctx)
{
int pages;
struct mm_struct *mm;
spin_lock(&kctx->mm_update_lock);
mm = rcu_dereference_protected(kctx->process_mm, lockdep_is_held(&kctx->mm_update_lock));
if (!mm) {
spin_unlock(&kctx->mm_update_lock);
return;
}
rcu_assign_pointer(kctx->process_mm, NULL);
spin_unlock(&kctx->mm_update_lock);
synchronize_rcu();
pages = atomic_xchg(&kctx->nonmapped_pages, 0);
#ifdef SPLIT_RSS_COUNTING
add_mm_counter(mm, MM_FILEPAGES, -pages);
#else
spin_lock(&mm->page_table_lock);
add_mm_counter(mm, MM_FILEPAGES, -pages);
spin_unlock(&mm->page_table_lock);
#endif
}
static void kbase_special_vm_close(struct vm_area_struct *vma)
{
struct kbase_context *kctx;
kctx = vma->vm_private_data;
kbasep_os_process_page_usage_drain(kctx);
}
static const struct vm_operations_struct kbase_vm_special_ops = {
.close = kbase_special_vm_close,
};
static int kbase_tracking_page_setup(struct kbase_context *kctx, struct vm_area_struct *vma)
{
/* check that this is the only tracking page */
spin_lock(&kctx->mm_update_lock);
if (rcu_dereference_protected(kctx->process_mm, lockdep_is_held(&kctx->mm_update_lock))) {
spin_unlock(&kctx->mm_update_lock);
return -EFAULT;
}
rcu_assign_pointer(kctx->process_mm, current->mm);
spin_unlock(&kctx->mm_update_lock);
/* no real access */
vma->vm_flags &= ~(VM_READ | VM_MAYREAD | VM_WRITE | VM_MAYWRITE | VM_EXEC | VM_MAYEXEC);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0))
vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP | VM_IO;
#else
vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_RESERVED | VM_IO;
#endif
vma->vm_ops = &kbase_vm_special_ops;
vma->vm_private_data = kctx;
return 0;
}
void *kbase_va_alloc(struct kbase_context *kctx, u32 size, struct kbase_hwc_dma_mapping *handle)
{
int res;
void *va;
dma_addr_t dma_pa;
struct kbase_va_region *reg;
struct tagged_addr *page_array;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
unsigned long attrs = DMA_ATTR_WRITE_COMBINE;
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
DEFINE_DMA_ATTRS(attrs);
#endif
u32 pages = ((size - 1) >> PAGE_SHIFT) + 1;
u32 flags = BASE_MEM_PROT_CPU_RD | BASE_MEM_PROT_CPU_WR |
BASE_MEM_PROT_GPU_RD | BASE_MEM_PROT_GPU_WR;
u32 i;
KBASE_DEBUG_ASSERT(kctx != NULL);
KBASE_DEBUG_ASSERT(0 != size);
KBASE_DEBUG_ASSERT(0 != pages);
if (size == 0)
goto err;
/* All the alloc calls return zeroed memory */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
va = dma_alloc_attrs(kctx->kbdev->dev, size, &dma_pa, GFP_KERNEL,
attrs);
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
va = dma_alloc_attrs(kctx->kbdev->dev, size, &dma_pa, GFP_KERNEL,
&attrs);
#else
va = dma_alloc_writecombine(kctx->kbdev->dev, size, &dma_pa, GFP_KERNEL);
#endif
if (!va)
goto err;
/* Store the state so we can free it later. */
handle->cpu_va = va;
handle->dma_pa = dma_pa;
handle->size = size;
reg = kbase_alloc_free_region(kctx, 0, pages, KBASE_REG_ZONE_SAME_VA);
if (!reg)
goto no_reg;
reg->flags &= ~KBASE_REG_FREE;
if (kbase_update_region_flags(kctx, reg, flags) != 0)
goto invalid_flags;
reg->cpu_alloc = kbase_alloc_create(pages, KBASE_MEM_TYPE_RAW);
if (IS_ERR_OR_NULL(reg->cpu_alloc))
goto no_alloc;
reg->gpu_alloc = kbase_mem_phy_alloc_get(reg->cpu_alloc);
page_array = kbase_get_cpu_phy_pages(reg);
for (i = 0; i < pages; i++)
page_array[i] = as_tagged(dma_pa + ((dma_addr_t)i << PAGE_SHIFT));
reg->cpu_alloc->nents = pages;
kbase_gpu_vm_lock(kctx);
res = kbase_gpu_mmap(kctx, reg, (uintptr_t) va, pages, 1);
kbase_gpu_vm_unlock(kctx);
if (res)
goto no_mmap;
return va;
no_mmap:
kbase_mem_phy_alloc_put(reg->cpu_alloc);
kbase_mem_phy_alloc_put(reg->gpu_alloc);
no_alloc:
invalid_flags:
kfree(reg);
no_reg:
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
dma_free_attrs(kctx->kbdev->dev, size, va, dma_pa, attrs);
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
dma_free_attrs(kctx->kbdev->dev, size, va, dma_pa, &attrs);
#else
dma_free_writecombine(kctx->kbdev->dev, size, va, dma_pa);
#endif
err:
return NULL;
}
KBASE_EXPORT_SYMBOL(kbase_va_alloc);
void kbase_va_free(struct kbase_context *kctx, struct kbase_hwc_dma_mapping *handle)
{
struct kbase_va_region *reg;
int err;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) && \
(LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
DEFINE_DMA_ATTRS(attrs);
#endif
KBASE_DEBUG_ASSERT(kctx != NULL);
KBASE_DEBUG_ASSERT(handle->cpu_va != NULL);
kbase_gpu_vm_lock(kctx);
reg = kbase_region_tracker_find_region_base_address(kctx, (uintptr_t)handle->cpu_va);
KBASE_DEBUG_ASSERT(reg);
err = kbase_gpu_munmap(kctx, reg);
kbase_gpu_vm_unlock(kctx);
KBASE_DEBUG_ASSERT(!err);
kbase_mem_phy_alloc_put(reg->cpu_alloc);
kbase_mem_phy_alloc_put(reg->gpu_alloc);
kfree(reg);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
dma_free_attrs(kctx->kbdev->dev, handle->size,
handle->cpu_va, handle->dma_pa, DMA_ATTR_WRITE_COMBINE);
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
dma_free_attrs(kctx->kbdev->dev, handle->size,
handle->cpu_va, handle->dma_pa, &attrs);
#else
dma_free_writecombine(kctx->kbdev->dev, handle->size,
handle->cpu_va, handle->dma_pa);
#endif
}
KBASE_EXPORT_SYMBOL(kbase_va_free);