Le 22/05/2014 17:28, Arnd Bergmann a écrit : > On Thursday 22 May 2014 17:09:56 LABBE Corentin wrote: >> Signed-off-by: LABBE Corentin <clabbe.montjoie@xxxxxxxxx> >> --- >> drivers/crypto/Kconfig | 49 ++ >> drivers/crypto/Makefile | 1 + >> drivers/crypto/sunxi-ss.c | 1476 +++++++++++++++++++++++++++++++++++++++++++++ >> 3 files changed, 1526 insertions(+) >> create mode 100644 drivers/crypto/sunxi-ss.c >> >> diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig >> index 03ccdb0..5ea0922 100644 >> --- a/drivers/crypto/Kconfig >> +++ b/drivers/crypto/Kconfig >> @@ -418,4 +418,53 @@ config CRYPTO_DEV_MXS_DCP >> To compile this driver as a module, choose M here: the module >> will be called mxs-dcp. >> >> +config CRYPTO_DEV_SUNXI_SS >> + tristate "Support for Allwinner Security System cryptographic accelerator" >> + depends on ARCH_SUNXI >> + help >> + Some Allwinner processors have a crypto accelerator named >> + Security System. Select this if you want to use it. >> + >> + To compile this driver as a module, choose M here: the module >> + will be called sunxi-ss. >> + >> +if CRYPTO_DEV_SUNXI_SS >> +config CRYPTO_DEV_SUNXI_SS_PRNG >> + bool "Security System PRNG" >> + select CRYPTO_RNG2 >> + help >> + If you enable this option, the SS will provide a pseudo random >> + number generator. >> +config CRYPTO_DEV_SUNXI_SS_MD5 >> + bool "Security System MD5" >> + select CRYPTO_MD5 >> + help >> + If you enable this option, the SS will provide MD5 hardware >> + acceleration. > > My feeling is that this should either be one driver that provides > all five algorithms unconditionally, or five drivers that are each > separate loadable modules and based on top of a common module > that only exports functions but has no active logic itself I agree for the split. It was my first intention but I feared to add too many files. So I propose to split in 6, sunxi-ss-hash.c, sunxi-ss-des.c, sunxi-ss-aes.c, sunxi-ss-rng.c, sunxi-ss-common.c and sunxi-ss.h Does can I add a sunxi-ss directory in drivers/crypto ? > >> +#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_MD5 >> +#include <crypto/md5.h> >> +#define SUNXI_SS_HASH_COMMON >> +#endif >> +#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_SHA1 >> +#include <crypto/sha.h> >> +#define SUNXI_SS_HASH_COMMON >> +#endif >> +#ifdef SUNXI_SS_HASH_COMMON >> +#include <crypto/hash.h> >> +#include <crypto/internal/hash.h> >> +#endif >> +#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_AES >> +#include <crypto/aes.h> >> +#endif >> + >> +#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_3DES >> +#define SUNXI_SS_DES >> +#endif >> +#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_DES >> +#define SUNXI_SS_DES >> +#endif >> +#ifdef SUNXI_SS_DES >> +#include <crypto/des.h> >> +#endif >> + >> +#ifdef CONFIG_CRYPTO_DEV_SUNXI_SS_PRNG >> +#include <crypto/internal/rng.h> > > That would cleanup this #ifdef chain either way. > >> +/* General notes: >> + * I cannot use a key/IV cache because each time one of these change ALL stuff >> + * need to be re-writed. >> + * And for example, with dm-crypt IV changes on each request. >> + * >> + * After each request the device must be disabled. >> + * >> + * For performance reason, we use writel_relaxed/read_relaxed for all >> + * operations on RX and TX FIFO. >> + * For all other registers, we use writel. >> + * See http://permalink.gmane.org/gmane.linux.ports.arm.kernel/117644 >> + * and http://permalink.gmane.org/gmane.linux.ports.arm.kernel/117640 >> + * */ >> + >> +static struct sunxi_ss_ctx { >> + void *base; > > __iomem ? ok > >> + int irq; >> + struct clk *busclk; >> + struct clk *ssclk; >> + struct device *dev; >> + struct resource *res; >> + void *buf_in; /* pointer to data to be uploaded to the device */ >> + size_t buf_in_size; /* size of buf_in */ >> + void *buf_out; >> + size_t buf_out_size; >> +} _ss_ctx, *ss_ctx = &_ss_ctx; >> + >> +static DEFINE_MUTEX(lock); >> +static DEFINE_MUTEX(bufout_lock); >> +static DEFINE_MUTEX(bufin_lock); > > I guess the mutexes should be part of sunxi_ss_ctx. > > Are you sure you need the global _ss_ctx structure? > Normally you should get a pointer from whoever calls you. I will use platform_get_drvdata/platform_set_drvdata for cleaning all thoses global structures.. > >> +struct sunxi_req_ctx { >> + u8 key[AES_MAX_KEY_SIZE * 8]; >> + u32 keylen; >> + u32 mode; >> + u64 byte_count; /* number of bytes "uploaded" to the device */ >> + u32 waitbuf; /* a partial word waiting to be completed and >> + uploaded to the device */ >> + /* number of bytes to be uploaded in the waitbuf word */ >> + unsigned int nbwait; >> +}; >> + >> +#ifdef SUNXI_SS_HASH_COMMON >> +/*============================================================================*/ >> +/*============================================================================*/ > > Please remove all the ======== lines. ok > >> + /* If we have more than one SG, we cannot use kmap_atomic since >> + * we hold the mapping too long*/ >> + src_addr = kmap(sg_page(in_sg)) + in_sg->offset; >> + if (src_addr == NULL) { >> + dev_err(ss_ctx->dev, "KMAP error for src SG\n"); >> + return -1; >> + } >> + dst_addr = kmap(sg_page(out_sg)) + out_sg->offset; >> + if (dst_addr == NULL) { >> + kunmap(src_addr); >> + dev_err(ss_ctx->dev, "KMAP error for dst SG\n"); >> + return -1; >> + } >> + src32 = (u32 *)src_addr; >> + dst32 = (u32 *)dst_addr; >> + ileft = nbytes / 4; >> + oleft = nbytes / 4; >> + sgileft = in_sg->length / 4; >> + sgoleft = out_sg->length / 4; >> + do { >> + tmp = readl_relaxed(ss_ctx->base + SUNXI_SS_FCSR); >> + rx_cnt = SS_RXFIFO_SPACES(tmp); >> + tx_cnt = SS_TXFIFO_SPACES(tmp); >> + todo = min3(rx_cnt, ileft, sgileft); >> + if (todo > 0) { >> + ileft -= todo; >> + sgileft -= todo; >> + } >> + while (todo > 0) { >> + writel_relaxed(*src32++, ss_ctx->base + SS_RXFIFO); >> + todo--; >> + } > > I wonder if this is meant to be used in combination with a dma engine > rather than accessed with writel/readl. You could do both, but the dmaengine driver is under development. When it will be ready, I will add DMA support. But my intention is to keep both mode, since poll mode is better than DMA for small request. > > How does the original driver do it? There are no original driver, this driver is the first for the Security System. > > Arnd > Thanks for your review. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
