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Message-Id: <20210101131626.4636-1-ogabbay@kernel.org> Date: Fri, 1 Jan 2021 15:16:25 +0200 From: Oded Gabbay <ogabbay@...nel.org> To: linux-kernel@...r.kernel.org Cc: Ofir Bitton <obitton@...ana.ai> Subject: [PATCH 1/2] habanalabs: report correct dram size in info ioctl From: Ofir Bitton <obitton@...ana.ai> 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@...ana.ai> Reviewed-by: Oded Gabbay <ogabbay@...nel.org> Signed-off-by: Oded Gabbay <ogabbay@...nel.org> --- drivers/misc/habanalabs/common/habanalabs_ioctl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/misc/habanalabs/common/habanalabs_ioctl.c b/drivers/misc/habanalabs/common/habanalabs_ioctl.c index 64a82c966836..b83ee32ae569 100644 --- a/drivers/misc/habanalabs/common/habanalabs_ioctl.c +++ b/drivers/misc/habanalabs/common/habanalabs_ioctl.c @@ -62,7 +62,13 @@ 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 = rounddown(prop->dram_size - dram_kmd_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; -- 2.25.1
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