[PATCH 1/2] mmc: mmci_sdmmc: fix DMA API warning overlapping mappings

From: Ludovic Barre
Date: Tue May 26 2020 - 11:51:32 EST

Turning on CONFIG_DMA_API_DEBUG_SG results in the following warning:
WARNING: CPU: 1 PID: 20 at kernel/dma/debug.c:500 add_dma_entry+0x16c/0x17c
DMA-API: exceeded 7 overlapping mappings of cacheline 0x031d2645
Modules linked in:
CPU: 1 PID: 20 Comm: kworker/1:1 Not tainted 5.5.0-rc2-00021-gdeda30999c2b-dirty #49
Hardware name: STM32 (Device Tree Support)
Workqueue: events_freezable mmc_rescan
[<c03138c0>] (unwind_backtrace) from [<c030d760>] (show_stack+0x10/0x14)
[<c030d760>] (show_stack) from [<c0f2eb28>] (dump_stack+0xc0/0xd4)
[<c0f2eb28>] (dump_stack) from [<c034a14c>] (__warn+0xd0/0xf8)
[<c034a14c>] (__warn) from [<c034a530>] (warn_slowpath_fmt+0x94/0xb8)
[<c034a530>] (warn_slowpath_fmt) from [<c03bca0c>] (add_dma_entry+0x16c/0x17c)
[<c03bca0c>] (add_dma_entry) from [<c03bdf54>] (debug_dma_map_sg+0xe4/0x3d4)
[<c03bdf54>] (debug_dma_map_sg) from [<c0d09244>] (sdmmc_idma_prep_data+0x94/0xf8)
[<c0d09244>] (sdmmc_idma_prep_data) from [<c0d05a2c>] (mmci_prep_data+0x2c/0xb0)
[<c0d05a2c>] (mmci_prep_data) from [<c0d073ec>] (mmci_start_data+0x134/0x2f0)
[<c0d073ec>] (mmci_start_data) from [<c0d078d0>] (mmci_request+0xe8/0x154)
[<c0d078d0>] (mmci_request) from [<c0cecb44>] (mmc_start_request+0x94/0xbc)

DMA api debug brings to light leaking dma-mappings, dma_map_sg and
dma_unmap_sg are not correctly balanced.

If a request is prepared, the dma_map/unmap are done in asynchronous
call pre_req (prep_data) and post_req (unprep_data). In this case
the dma-mapping is right balanced.

But if the request was not prepared, the data->host_cookie is
define to zero and the dma_map/unmap must be done in the request.
The dma_map is called by mmci_dma_start (prep_data), but there is
no dma_unmap in this case.

This patch adds dma_unmap_sg when the dma is finalized and
the data cookie is zero (request not prepared).

Signed-off-by: Ludovic Barre <ludovic.barre@xxxxxx>
drivers/mmc/host/mmci_stm32_sdmmc.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c
index 14f99d8aa3f0..2965b1c062e1 100644
--- a/drivers/mmc/host/mmci_stm32_sdmmc.c
+++ b/drivers/mmc/host/mmci_stm32_sdmmc.c
@@ -188,6 +188,9 @@ static int sdmmc_idma_start(struct mmci_host *host, unsigned int *datactrl)
static void sdmmc_idma_finalize(struct mmci_host *host, struct mmc_data *data)
writel_relaxed(0, host->base + MMCI_STM32_IDMACTRLR);
+ if (!data->host_cookie)
+ sdmmc_idma_unprep_data(host, data, 0);

static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired)