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Message-ID: <201807290135.LvhI1VTR%fengguang.wu@intel.com>
Date: Sun, 29 Jul 2018 01:35:45 +0800
From: kbuild test robot <lkp@...el.com>
To: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Cc: kbuild-all@...org, Adrian Hunter <adrian.hunter@...el.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH mmc-next v2 3/3] mmc: sdhci-of-dwcmshc: solve 128MB DMA
boundary limitation
Hi Jisheng,
I love your patch! Yet something to improve:
[auto build test ERROR on ulf.hansson-mmc/next]
[also build test ERROR on next-20180727]
[cannot apply to v4.18-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Jisheng-Zhang/solve-SDHCI-DWC-MSHC-128MB-DMA-boundary-limitation/20180728-234650
base: git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git next
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All error/warnings (new ones prefixed by >>):
drivers/mmc/host/sdhci-of-dwcmshc.c: In function 'dwcmshc_adma_write_desc':
>> drivers/mmc/host/sdhci-of-dwcmshc.c:18:12: error: 'SZ_128M' undeclared (first use in this function)
((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
^
>> drivers/mmc/host/sdhci-of-dwcmshc.c:34:6: note: in expansion of macro 'BOUNDARY_OK'
if (BOUNDARY_OK(addr, len) || !len)
^~~~~~~~~~~
drivers/mmc/host/sdhci-of-dwcmshc.c:18:12: note: each undeclared identifier is reported only once for each function it appears in
((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
^
>> drivers/mmc/host/sdhci-of-dwcmshc.c:34:6: note: in expansion of macro 'BOUNDARY_OK'
if (BOUNDARY_OK(addr, len) || !len)
^~~~~~~~~~~
In file included from include/linux/cache.h:5:0,
from include/linux/printk.h:9,
from include/linux/kernel.h:14,
from include/linux/clk.h:16,
from drivers/mmc/host/sdhci-of-dwcmshc.c:10:
drivers/mmc/host/sdhci-of-dwcmshc.c: In function 'dwcmshc_probe':
drivers/mmc/host/sdhci-of-dwcmshc.c:82:39: error: 'SZ_128M' undeclared (first use in this function)
extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
^
include/uapi/linux/kernel.h:13:46: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
#define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
^
>> drivers/mmc/host/sdhci-of-dwcmshc.c:82:10: note: in expansion of macro 'DIV_ROUND_UP'
extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
^~~~~~~~~~~~
vim +/SZ_128M +18 drivers/mmc/host/sdhci-of-dwcmshc.c
> 10 #include <linux/clk.h>
11 #include <linux/mm.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14
15 #include "sdhci-pltfm.h"
16
17 #define BOUNDARY_OK(addr, len) \
> 18 ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
19
20 struct dwcmshc_priv {
21 struct clk *bus_clk;
22 };
23
24 /*
25 * if DMA addr spans 128MB boundary, we split the DMA transfer into two
26 * so that the DMA transfer doesn't exceed the boundary.
27 */
28 static unsigned int dwcmshc_adma_write_desc(struct sdhci_host *host,
29 void *desc, dma_addr_t addr,
30 int len, unsigned int cmd)
31 {
32 int tmplen, offset;
33
> 34 if (BOUNDARY_OK(addr, len) || !len)
35 return _sdhci_adma_write_desc(host, desc, addr, len, cmd);
36
37 offset = addr & (SZ_128M - 1);
38 tmplen = SZ_128M - offset;
39 _sdhci_adma_write_desc(host, desc, addr, tmplen, cmd);
40
41 addr += tmplen;
42 len -= tmplen;
43 desc += host->desc_sz;
44 _sdhci_adma_write_desc(host, desc, addr, len, cmd);
45
46 return host->desc_sz * 2;
47 }
48
49 static const struct sdhci_ops sdhci_dwcmshc_ops = {
50 .set_clock = sdhci_set_clock,
51 .set_bus_width = sdhci_set_bus_width,
52 .set_uhs_signaling = sdhci_set_uhs_signaling,
53 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
54 .reset = sdhci_reset,
55 .adma_write_desc = dwcmshc_adma_write_desc,
56 };
57
58 static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
59 .ops = &sdhci_dwcmshc_ops,
60 .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
61 };
62
63 static int dwcmshc_probe(struct platform_device *pdev)
64 {
65 struct sdhci_pltfm_host *pltfm_host;
66 struct sdhci_host *host;
67 struct dwcmshc_priv *priv;
68 int err;
69 u32 extra;
70
71 host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata,
72 sizeof(struct dwcmshc_priv));
73 if (IS_ERR(host))
74 return PTR_ERR(host);
75
76 /*
77 * The DMA descriptor table number is calculated as the maximum
78 * number of segments times 2, to allow for an alignment
79 * descriptor for each segment, plus 1 for a nop end descriptor,
80 * plus extra number for cross 128M boundary handling.
81 */
> 82 extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
83 if (extra > SDHCI_MAX_SEGS)
84 extra = SDHCI_MAX_SEGS;
85 host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1 + extra;
86
87 pltfm_host = sdhci_priv(host);
88 priv = sdhci_pltfm_priv(pltfm_host);
89
90 pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
91 if (IS_ERR(pltfm_host->clk)) {
92 err = PTR_ERR(pltfm_host->clk);
93 dev_err(&pdev->dev, "failed to get core clk: %d\n", err);
94 goto free_pltfm;
95 }
96 err = clk_prepare_enable(pltfm_host->clk);
97 if (err)
98 goto free_pltfm;
99
100 priv->bus_clk = devm_clk_get(&pdev->dev, "bus");
101 if (!IS_ERR(priv->bus_clk))
102 clk_prepare_enable(priv->bus_clk);
103
104 err = mmc_of_parse(host->mmc);
105 if (err)
106 goto err_clk;
107
108 sdhci_get_of_property(pdev);
109
110 err = sdhci_add_host(host);
111 if (err)
112 goto err_clk;
113
114 return 0;
115
116 err_clk:
117 clk_disable_unprepare(pltfm_host->clk);
118 clk_disable_unprepare(priv->bus_clk);
119 free_pltfm:
120 sdhci_pltfm_free(pdev);
121 return err;
122 }
123
---
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