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Date: Fri, 1 Mar 2019 11:07:17 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Kamil Konieczny <k.konieczny@...tner.samsung.com>,
Vladimir Zapolskiy <vz@...ia.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@...r.kernel.org>,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v4 3/3] crypto: s5p: add AES support for Exynos5433
On Fri, 1 Mar 2019 at 10:56, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On Fri, 22 Feb 2019 at 13:22, Kamil Konieczny
> <k.konieczny@...tner.samsung.com> wrote:
> >
> > Add AES crypto HW acceleration for Exynos5433, with the help of SlimSSS IP.
> >
> > Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
> > Signed-off-by: Kamil Konieczny <k.konieczny@...tner.samsung.com>
> > ---
> > drivers/crypto/s5p-sss.c | 50 ++++++++++++++++++++++++++++++++++++----
> > 1 file changed, 46 insertions(+), 4 deletions(-)
> > diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
> > index 0064be0e3941..3f45cc5cb94a 100644
> > --- a/drivers/crypto/s5p-sss.c
> > +++ b/drivers/crypto/s5p-sss.c
> > @@ -232,6 +232,7 @@
> > * struct samsung_aes_variant - platform specific SSS driver data
> > * @aes_offset: AES register offset from SSS module's base.
> > * @hash_offset: HASH register offset from SSS module's base.
> > + * @clk_names: names of clocks needed to run SSS IP
> > *
> > * Specifies platform specific configuration of SSS module.
> > * Note: A structure for driver specific platform data is used for future
> > @@ -240,6 +241,7 @@
> > struct samsung_aes_variant {
> > unsigned int aes_offset;
> > unsigned int hash_offset;
> > + const char *clk_names[];
> > };
> >
> > struct s5p_aes_reqctx {
> > @@ -296,6 +298,7 @@ struct s5p_aes_ctx {
> > struct s5p_aes_dev {
> > struct device *dev;
> > struct clk *clk;
> > + struct clk *pclk;
> > void __iomem *ioaddr;
> > void __iomem *aes_ioaddr;
> > int irq_fc;
> > @@ -384,11 +387,19 @@ struct s5p_hash_ctx {
> > static const struct samsung_aes_variant s5p_aes_data = {
> > .aes_offset = 0x4000,
> > .hash_offset = 0x6000,
> > + .clk_names = { "secss", },
> > };
> >
> > static const struct samsung_aes_variant exynos_aes_data = {
> > .aes_offset = 0x200,
> > .hash_offset = 0x400,
> > + .clk_names = { "secss", },
> > +};
> > +
> > +static const struct samsung_aes_variant exynos5433_slim_aes_data = {
> > + .aes_offset = 0x400,
> > + .hash_offset = 0x800,
> > + .clk_names = { "pclk", "aclk", },
> > };
> >
> > static const struct of_device_id s5p_sss_dt_match[] = {
> > @@ -400,6 +411,10 @@ static const struct of_device_id s5p_sss_dt_match[] = {
> > .compatible = "samsung,exynos4210-secss",
> > .data = &exynos_aes_data,
> > },
> > + {
> > + .compatible = "samsung,exynos5433-slim-sss",
> > + .data = &exynos5433_slim_aes_data,
> > + },
> > { },
> > };
> > MODULE_DEVICE_TABLE(of, s5p_sss_dt_match);
> > @@ -2208,18 +2223,39 @@ static int s5p_aes_probe(struct platform_device *pdev)
> > return PTR_ERR(pdata->ioaddr);
> > }
> >
> > - pdata->clk = devm_clk_get(dev, "secss");
> > + pdata->clk = devm_clk_get(dev, variant->clk_names[0]);
> > if (IS_ERR(pdata->clk)) {
> > - dev_err(dev, "failed to find secss clock source\n");
> > + dev_err(dev, "failed to find secss clock %s\n",
> > + variant->clk_names[0]);
> > return -ENOENT;
> > }
> >
> > err = clk_prepare_enable(pdata->clk);
> > if (err < 0) {
> > - dev_err(dev, "Enabling SSS clk failed, err %d\n", err);
> > + dev_err(dev, "Enabling clock %s failed, err %d\n",
> > + variant->clk_names[0], err);
> > return err;
> > }
> >
> > + if (variant->clk_names[1]) {
> > + pdata->pclk = devm_clk_get(dev, variant->clk_names[1]);
>
> I see on today's linux next:
> [ 6.391256] Unable to handle kernel paging request at virtual address 00004000
> on all my Exynos boards (U3, XU, XU3, HC1).
> I did not do a bisect yet but it might be connected with this commit.
>
> The call trace is:
> (strcmp) from [<c0774014>] (of_property_match_string+0x58/0xd0)
> (of_property_match_string) from [<c04d3d2c>] (__of_clk_get_by_name+0x5c/0x130)
> (__of_clk_get_by_name) from [<c04d3fa0>] (clk_get+0x34/0x70)
> (clk_get) from [<c04d3680>] (devm_clk_get+0x38/0x74)
> (devm_clk_get) from [<c075c248>] (s5p_aes_probe+0xd4/0x4a0)
> (s5p_aes_probe) from [<c059dbc4>] (platform_drv_probe+0x6c/0xa4)
> (platform_drv_probe) from [<c059b4c8>] (really_probe+0x280/0x414)
> (really_probe) from [<c059b810>] (driver_probe_device+0x78/0x1c0)
> (driver_probe_device) from [<c059bbb8>] (device_driver_attach+0x58/0x60)
> (device_driver_attach) from [<c059bcbc>] (__driver_attach+0xfc/0x160)
> (__driver_attach) from [<c059928c>] (bus_for_each_dev+0x68/0xb4)
> (bus_for_each_dev) from [<c059a5c4>] (bus_add_driver+0x158/0x214)
> (bus_add_driver) from [<c059cb94>] (driver_register+0x78/0x110)
> (driver_register) from [<c01031f8>] (do_one_initcall+0x8c/0x404)
>
> Full log:
> https://krzk.eu/#/builders/21/builds/1153/steps/12/logs/serial0
>
> The s5p_aes_probe address points here.
>
It seems that dereferencing clk_names[1] of struct samsung_aes_variant
exynos_aes_data
> > + .clk_names = { "secss", },
returns the first member of
> > static const struct samsung_aes_variant s5p_aes_data = {
> > .aes_offset = 0x4000,
since the array has only one entry in this case, and so the second,
non-existing entry overlaps with the next data item in the object
file.
So the fix would be to use
.clk_names = { "secss", NULL },
instead (or define the array to have 2 members)
>
> >
> > + if (IS_ERR(pdata->pclk)) {
> > + dev_err(dev, "failed to find clock %s\n",
> > + variant->clk_names[1]);
> > + err = -ENOENT;
> > + goto err_clk;
> > + }
> > +
> > + err = clk_prepare_enable(pdata->pclk);
> > + if (err < 0) {
> > + dev_err(dev, "Enabling clock %s failed, err %d\n",
> > + variant->clk_names[0], err);
> > + goto err_clk;
> > + }
> > + } else {
> > + pdata->pclk = NULL;
> > + }
> > +
> > spin_lock_init(&pdata->lock);
> > spin_lock_init(&pdata->hash_lock);
> >
> > @@ -2295,8 +2331,11 @@ static int s5p_aes_probe(struct platform_device *pdev)
> > tasklet_kill(&pdata->tasklet);
> >
> > err_irq:
> > - clk_disable_unprepare(pdata->clk);
> > + if (pdata->pclk)
> > + clk_disable_unprepare(pdata->pclk);
> >
> > +err_clk:
> > + clk_disable_unprepare(pdata->clk);
> > s5p_dev = NULL;
> >
> > return err;
> > @@ -2323,6 +2362,9 @@ static int s5p_aes_remove(struct platform_device *pdev)
> > pdata->use_hash = false;
> > }
> >
> > + if (pdata->pclk)
> > + clk_disable_unprepare(pdata->pclk);
> > +
> > clk_disable_unprepare(pdata->clk);
> > s5p_dev = NULL;
> >
> > --
> > 2.20.1
> >
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