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habanalabs: report correct dram size in info ioctl 

In case MMU is enabled, we must take MMU page size into
consideration when reporting dram size to the user.
This is because the MMU page size can be a value which is NOT
a power-of-2 value. As a result, the total DRAM size (which is always
a power-of-2 value) needed to be rounded-down.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Ofir Bitton 2020-12-31 12:00:55 +02:00 committed by Oded Gabbay
parent b19dc67aa8
commit 6769cea8de
1 changed files with 9 additions and 1 deletions
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10
drivers/misc/habanalabs/common/habanalabs_ioctl.c
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@ -62,7 +62,15 @@ static int hw_ip_info(struct hl_device *hdev, struct hl_info_args *args)
prop->dmmu.start_addr : prop->dram_user_base_address;
hw_ip.tpc_enabled_mask = prop->tpc_enabled_mask;
hw_ip.sram_size = prop->sram_size - sram_kmd_size;
hw_ip.dram_size = prop->dram_size - dram_kmd_size;
if (hdev->mmu_enable)
hw_ip.dram_size =
DIV_ROUND_DOWN_ULL(prop->dram_size - dram_kmd_size,
prop->dram_page_size) *
prop->dram_page_size;
else
hw_ip.dram_size = prop->dram_size - dram_kmd_size;
if (hw_ip.dram_size > PAGE_SIZE)
hw_ip.dram_enabled = 1;
hw_ip.dram_page_size = prop->dram_page_size;