| Message ID | 1600627038-40000-5-git-send-email-clabbe@baylibre.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | crypto: sun4i-ss: prevent always fallback for ciphers | expand |
On Wed, Sep 23, 2020 at 8:08 PM LABBE Corentin <clabbe@baylibre.com> wrote: > On Wed, Sep 23, 2020 at 04:00:32PM +0200, Arnd Bergmann wrote: > > On Sun, Sep 20, 2020 at 8:37 PM Corentin Labbe <clabbe@baylibre.com> wrote: > > > diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c > > > index c6c25204780d..a05889745097 100644 > > > --- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c > > > +++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c > > > @@ -52,13 +52,13 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq) > > > > > > spin_lock_irqsave(&ss->slock, flags); > > > > > > - for (i = 0; i < op->keylen; i += 4) > > > - writel(*(op->key + i / 4), ss->base + SS_KEY0 + i); > > > + for (i = 0; i < op->keylen / 4; i++) > > > + writel(cpu_to_le32(op->key[i]), ss->base + SS_KEY0 + i * 4); > > > > I suspect what you actually want here is writesl() in place of the > > loop. This skips the byteswap on big-endian, rather than swapping > > each word twice. > > > > The point is that this register seems to act as a FIFO for a byte-stream > > rather than a 32-bit fixed-endian register. > > Thanks, using writesl() fixes the warning, but I need to keep the loop > since the register is different each time. Ah, I see. I thought we had an interface for that as well, but I can't find it now. I see memcpy_toio32() in one driver, but that implementation appears to be wrong here (and probably also wrong for the machine it was meant for) There is the regular memcpy_toio(), but on big-endian Arm that turns into a per-byte copy, which might either not work on your hardware or be too slow. There is also __iowrite32_copy(), which is not what I had remembered but does seem to do what you want here. > Or does it is better to use directly __raw_writel() ? __raw_writel() is not very portable, so I would avoid that in normal device drivers even when you only run them on specific hardware. Arnd
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c index c6c25204780d..a05889745097 100644 --- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c +++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c @@ -52,13 +52,13 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq) spin_lock_irqsave(&ss->slock, flags); - for (i = 0; i < op->keylen; i += 4) - writel(*(op->key + i / 4), ss->base + SS_KEY0 + i); + for (i = 0; i < op->keylen / 4; i++) + writel(cpu_to_le32(op->key[i]), ss->base + SS_KEY0 + i * 4); if (areq->iv) { for (i = 0; i < 4 && i < ivsize / 4; i++) { v = *(u32 *)(areq->iv + i * 4); - writel(v, ss->base + SS_IV0 + i * 4); + writel(cpu_to_le32(v), ss->base + SS_IV0 + i * 4); } } writel(mode, ss->base + SS_CTL); @@ -225,13 +225,13 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq) spin_lock_irqsave(&ss->slock, flags); - for (i = 0; i < op->keylen; i += 4) - writel(*(op->key + i / 4), ss->base + SS_KEY0 + i); + for (i = 0; i < op->keylen / 4; i++) + writel(cpu_to_le32(op->key[i]), ss->base + SS_KEY0 + i * 4); if (areq->iv) { for (i = 0; i < 4 && i < ivsize / 4; i++) { v = *(u32 *)(areq->iv + i * 4); - writel(v, ss->base + SS_IV0 + i * 4); + writel(cpu_to_le32(v), ss->base + SS_IV0 + i * 4); } } writel(mode, ss->base + SS_CTL);
Ciphers produce invalid results on BE. Key and IV need to be written in LE. Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator") Cc: <stable@vger.kernel.org> Signed-off-by: Corentin Labbe <clabbe@baylibre.com> --- drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)