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linux-sg2042
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habanalabs: fix bug when mapping very large memory area 

This patch fixes a bug of allocating a too big memory size with kmalloc,
which causes a failure.
In case of mapping a large memory block, an array of the relevant physical
page addresses is allocated. If there are many pages the array might be
too big to allocate with kmalloc, hence changing to kvmalloc.

Signed-off-by: Omer Shpigelman <oshpigelman@habana.ai>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Omer Shpigelman 2019-03-07 15:47:19 +02:00 committed by Oded Gabbay
parent bfb1ce1259
commit 4eb1d1253d
1 changed files with 5 additions and 4 deletions
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9
drivers/misc/habanalabs/memory.c
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@ -93,7 +93,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
phys_pg_pack->flags = args->flags;
phys_pg_pack->contiguous = contiguous;
phys_pg_pack->pages = kcalloc(num_pgs, sizeof(u64), GFP_KERNEL);
phys_pg_pack->pages = kvmalloc_array(num_pgs, sizeof(u64), GFP_KERNEL);
if (!phys_pg_pack->pages) {
rc = -ENOMEM;
goto pages_arr_err;
@ -148,7 +148,7 @@ page_err:
gen_pool_free(vm->dram_pg_pool, phys_pg_pack->pages[i],
page_size);
kfree(phys_pg_pack->pages);
kvfree(phys_pg_pack->pages);
pages_arr_err:
kfree(phys_pg_pack);
pages_pack_err:
@ -288,7 +288,7 @@ static void free_phys_pg_pack(struct hl_device *hdev,
}
}
kfree(phys_pg_pack->pages);
kvfree(phys_pg_pack->pages);
kfree(phys_pg_pack);
}
@ -692,7 +692,8 @@ static int init_phys_pg_pack_from_userptr(struct hl_ctx *ctx,
page_mask = ~(((u64) page_size) - 1);
phys_pg_pack->pages = kcalloc(total_npages, sizeof(u64), GFP_KERNEL);
phys_pg_pack->pages = kvmalloc_array(total_npages, sizeof(u64),
GFP_KERNEL);
if (!phys_pg_pack->pages) {
rc = -ENOMEM;
goto page_pack_arr_mem_err;