void lib_ring_buffer_backend_free(struct lib_ring_buffer_backend *bufb)
{
struct channel_backend *chanb = &bufb->chan->backend;
unsigned long i, j, num_subbuf_alloc;
num_subbuf_alloc = chanb->num_subbuf;
if (chanb->extra_reader_sb)
num_subbuf_alloc++;
lttng_kvfree(bufb->buf_wsb);
lttng_kvfree(bufb->buf_cnt);
for (i = 0; i < num_subbuf_alloc; i++) {
for (j = 0; j < bufb->num_pages_per_subbuf; j++)
__free_page(pfn_to_page(bufb->array[i]->p[j].pfn));
lttng_kvfree(bufb->array[i]);
}
lttng_kvfree(bufb->array);
bufb->allocated = 0;
}
/*
* Copy of heap->ptrs pointer is invalid after heap_grow.
*/
static
int heap_grow(struct lttng_ptr_heap *heap, size_t new_len)
{
void **new_ptrs;
if (heap->alloc_len >= new_len)
return 0;
heap->alloc_len = max_t(size_t, new_len, heap->alloc_len << 1);
new_ptrs = lttng_kvmalloc(heap->alloc_len * sizeof(void *), heap->gfpmask);
if (!new_ptrs)
return -ENOMEM;
if (heap->ptrs)
memcpy(new_ptrs, heap->ptrs, heap->len * sizeof(void *));
lttng_kvfree(heap->ptrs);
heap->ptrs = new_ptrs;
return 0;
}
void lttng_heap_free(struct lttng_ptr_heap *heap)
{
lttng_kvfree(heap->ptrs);
}
/**
* lib_ring_buffer_backend_allocate - allocate a channel buffer
* @config: ring buffer instance configuration
* @buf: the buffer struct
* @size: total size of the buffer
* @num_subbuf: number of subbuffers
* @extra_reader_sb: need extra subbuffer for reader
*/
static
int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config,
struct lib_ring_buffer_backend *bufb,
size_t size, size_t num_subbuf,
int extra_reader_sb)
{
struct channel_backend *chanb = &bufb->chan->backend;
unsigned long j, num_pages, num_pages_per_subbuf, page_idx = 0;
unsigned long subbuf_size, mmap_offset = 0;
unsigned long num_subbuf_alloc;
struct page **pages;
unsigned long i;
num_pages = size >> PAGE_SHIFT;
num_pages_per_subbuf = num_pages >> get_count_order(num_subbuf);
subbuf_size = chanb->subbuf_size;
num_subbuf_alloc = num_subbuf;
if (extra_reader_sb) {
num_pages += num_pages_per_subbuf; /* Add pages for reader */
num_subbuf_alloc++;
}
pages = vmalloc_node(ALIGN(sizeof(*pages) * num_pages,
1 << INTERNODE_CACHE_SHIFT),
cpu_to_node(max(bufb->cpu, 0)));
if (unlikely(!pages))
goto pages_error;
bufb->array = lttng_kvmalloc_node(ALIGN(sizeof(*bufb->array)
* num_subbuf_alloc,
1 << INTERNODE_CACHE_SHIFT),
GFP_KERNEL | __GFP_NOWARN,
cpu_to_node(max(bufb->cpu, 0)));
if (unlikely(!bufb->array))
goto array_error;
for (i = 0; i < num_pages; i++) {
pages[i] = alloc_pages_node(cpu_to_node(max(bufb->cpu, 0)),
GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, 0);
if (unlikely(!pages[i]))
goto depopulate;
}
bufb->num_pages_per_subbuf = num_pages_per_subbuf;
/* Allocate backend pages array elements */
for (i = 0; i < num_subbuf_alloc; i++) {
bufb->array[i] =
lttng_kvzalloc_node(ALIGN(
sizeof(struct lib_ring_buffer_backend_pages) +
sizeof(struct lib_ring_buffer_backend_page)
* num_pages_per_subbuf,
1 << INTERNODE_CACHE_SHIFT),
GFP_KERNEL | __GFP_NOWARN,
cpu_to_node(max(bufb->cpu, 0)));
if (!bufb->array[i])
goto free_array;
}
/* Allocate write-side subbuffer table */
bufb->buf_wsb = lttng_kvzalloc_node(ALIGN(
sizeof(struct lib_ring_buffer_backend_subbuffer)
* num_subbuf,
1 << INTERNODE_CACHE_SHIFT),
GFP_KERNEL | __GFP_NOWARN,
cpu_to_node(max(bufb->cpu, 0)));
if (unlikely(!bufb->buf_wsb))
goto free_array;
for (i = 0; i < num_subbuf; i++)
bufb->buf_wsb[i].id = subbuffer_id(config, 0, 1, i);
/* Assign read-side subbuffer table */
if (extra_reader_sb)
bufb->buf_rsb.id = subbuffer_id(config, 0, 1,
num_subbuf_alloc - 1);
else
bufb->buf_rsb.id = subbuffer_id(config, 0, 1, 0);
/* Allocate subbuffer packet counter table */
bufb->buf_cnt = lttng_kvzalloc_node(ALIGN(
sizeof(struct lib_ring_buffer_backend_counts)
* num_subbuf,
1 << INTERNODE_CACHE_SHIFT),
GFP_KERNEL | __GFP_NOWARN,
cpu_to_node(max(bufb->cpu, 0)));
if (unlikely(!bufb->buf_cnt))
goto free_wsb;
/* Assign pages to page index */
for (i = 0; i < num_subbuf_alloc; i++) {
for (j = 0; j < num_pages_per_subbuf; j++) {
CHAN_WARN_ON(chanb, page_idx > num_pages);
bufb->array[i]->p[j].virt = page_address(pages[page_idx]);
bufb->array[i]->p[j].pfn = page_to_pfn(pages[page_idx]);
page_idx++;
}
if (config->output == RING_BUFFER_MMAP) {
bufb->array[i]->mmap_offset = mmap_offset;
mmap_offset += subbuf_size;
}
}
/*
* If kmalloc ever uses vmalloc underneath, make sure the buffer pages
* will not fault.
*/
wrapper_vmalloc_sync_all();
vfree(pages);
return 0;
free_wsb:
lttng_kvfree(bufb->buf_wsb);
free_array:
for (i = 0; (i < num_subbuf_alloc && bufb->array[i]); i++)
lttng_kvfree(bufb->array[i]);
depopulate:
/* Free all allocated pages */
for (i = 0; (i < num_pages && pages[i]); i++)
__free_page(pages[i]);
lttng_kvfree(bufb->array);
array_error:
vfree(pages);
pages_error:
return -ENOMEM;
}