Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem
On Thu, 5 Mar 2015 10:52:37 +0800 yjin wrote: > On 2015年03月05日 02:36, Kim Phillips wrote: > > On Wed, 4 Mar 2015 13:33:22 +0800 > > yjin wrote: > > > >> On 2015年03月04日 03:31, Kim Phillips wrote: > >>> On Tue, 3 Mar 2015 14:50:52 +0800 > >>> wrote: > >>> > -dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN, > - DMA_TO_DEVICE); > +dma_unmap_single(jrdev, ctx->sh_desc_dma, > +desc_bytes(ctx->sh_desc), > DMA_TO_DEVICE); > >>> alignment: the 'd' in desc_bytes should fall directly under the 'j' > >>> in jrdev. > >>> > >>> Also, DESC_RNG_LEN should be corrected to (4 * CAAM_CMD_SZ). > >> > >> I can't find the obvious limitation for the RNG descriptor length in > >> Freescale documents, could you point out it? > > ? rng_create_sh_desc() creates a fixed descriptor of exactly 4 > > command-lengths. > > Do you mean that the code itself limits the descriptor length? Not a > hardware limitation. the code writes descriptors such that they don't reach h/w limitations. > If so, I prefer to dma_unmap with desc_bytes(ctx->sh_desc) as my > previous patch, and correct DESC_RNG_LEN to (4 * CAAM_CMD_SZ). please. Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem
On 2015年03月05日 02:36, Kim Phillips wrote: On Wed, 4 Mar 2015 13:33:22 +0800 yjin wrote: On 2015年03月04日 03:31, Kim Phillips wrote: On Tue, 3 Mar 2015 14:50:52 +0800 wrote: - dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN, -DMA_TO_DEVICE); + dma_unmap_single(jrdev, ctx->sh_desc_dma, + desc_bytes(ctx->sh_desc), DMA_TO_DEVICE); alignment: the 'd' in desc_bytes should fall directly under the 'j' in jrdev. Also, DESC_RNG_LEN should be corrected to (4 * CAAM_CMD_SZ). Hi Kim, I can't find the obvious limitation for the RNG descriptor length in Freescale documents, could you point out it? ? rng_create_sh_desc() creates a fixed descriptor of exactly 4 command-lengths. Hi Kim, Do you mean that the code itself limits the descriptor length? Not a hardware limitation. If so, I prefer to dma_unmap with desc_bytes(ctx->sh_desc) as my previous patch, and correct DESC_RNG_LEN to (4 * CAAM_CMD_SZ). Thanks! Yanjiang Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem
On Wed, 4 Mar 2015 13:33:22 +0800 yjin wrote: > On 2015年03月04日 03:31, Kim Phillips wrote: > > On Tue, 3 Mar 2015 14:50:52 +0800 > > wrote: > > > >> - dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN, > >> - DMA_TO_DEVICE); > >> + dma_unmap_single(jrdev, ctx->sh_desc_dma, > >> + desc_bytes(ctx->sh_desc), DMA_TO_DEVICE); > > alignment: the 'd' in desc_bytes should fall directly under the 'j' > > in jrdev. > > > > Also, DESC_RNG_LEN should be corrected to (4 * CAAM_CMD_SZ). > > Hi Kim, > > I can't find the obvious limitation for the RNG descriptor length in > Freescale documents, could you point out it? ? rng_create_sh_desc() creates a fixed descriptor of exactly 4 command-lengths. Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem
On 2015年03月04日 03:31, Kim Phillips wrote: On Tue, 3 Mar 2015 14:50:52 +0800 wrote: - dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN, -DMA_TO_DEVICE); + dma_unmap_single(jrdev, ctx->sh_desc_dma, + desc_bytes(ctx->sh_desc), DMA_TO_DEVICE); alignment: the 'd' in desc_bytes should fall directly under the 'j' in jrdev. Also, DESC_RNG_LEN should be corrected to (4 * CAAM_CMD_SZ). Hi Kim, I can't find the obvious limitation for the RNG descriptor length in Freescale documents, could you point out it? Thanks! Yanjiang Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem
On Tue, 3 Mar 2015 14:50:52 +0800 wrote: > - dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN, > - DMA_TO_DEVICE); > + dma_unmap_single(jrdev, ctx->sh_desc_dma, > + desc_bytes(ctx->sh_desc), DMA_TO_DEVICE); alignment: the 'd' in desc_bytes should fall directly under the 'j' in jrdev. Also, DESC_RNG_LEN should be corrected to (4 * CAAM_CMD_SZ). Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP size problem
From: Yanjiang Jin Fix rng_unmap_ctx's DMA_UNMAP size problem for caam_rng, else system would report the below calltrace during kexec boot: caam_jr ffe301000.jr: DMA-API: device driver frees DMA memory with different size [device address=0x7f080010] [map size=16 bytes] [unmap size=40 bytes] [ cut here ] WARNING: at lib/dma-debug.c:887 Modules linked in: CPU: 1 PID: 730 Comm: kexec Not tainted 3.10.62-ltsi-WR6.0.0.0_standard #188 task: c000f7cdaa80 ti: c000e534 task.ti: c000e534 NIP: c04f5bc8 LR: c04f5bc4 CTR: c05f69b0 REGS: c000e53433c0 TRAP: 0700 Not tainted (3.10.62-ltsi-WR6.0.0.0_standard) MSR: 80029000 CR: 24088482 XER: SOFTE: 0 GPR00: c04f5bc4 c000e5343640 c12af360 009f GPR04: 00a0 c0d02070 c00015980660 GPR08: c0cff360 c12da018 GPR12: 01e3 c1fff780 100f 0001 GPR16: 0002 GPR20: 0001 GPR24: 0001 0001 0001 GPR28: c1556b90 c1565b80 c000e5343750 c000f9427480 NIP [c04f5bc8] .check_unmap+0x538/0x9c0 LR [c04f5bc4] .check_unmap+0x534/0x9c0 Call Trace: [c000e5343640] [c04f5bc4] .check_unmap+0x534/0x9c0 (unreliable) [c000e53436e0] [c04f60d4] .debug_dma_unmap_page+0x84/0xb0 [c000e5343810] [c082f9d4] .caam_cleanup+0x1d4/0x240 [c000e53438a0] [c056cc88] .hwrng_unregister+0xd8/0x1c0 [c000e5343930] [c082fa74] .caam_rng_shutdown+0x34/0x60 [c000e53439a0] [c0817354] .caam_remove+0x54/0x420 [c000e5343a70] [c05791ac] .platform_drv_shutdown+0x3c/0x60 [c000e5343af0] [c0573728] .device_shutdown+0x128/0x240 [c000e5343b90] [c00880b4] .kernel_restart_prepare+0x54/0x70 [c000e5343c10] [c00e5cac] .kernel_kexec+0x9c/0xd0 [c000e5343c90] [c0088404] .SyS_reboot+0x244/0x2d0 [c000e5343e30] [c718] syscall_exit+0x0/0x8c Instruction dump: 7c641b78 41de0410 e8a90050 2fa5 419e0484 e8de0028 e8ff0030 3c62ff90 e91e0030 38638388 48546ed9 6000 <0fe0> 3c62ff8f 38637fc8 48546ec5 ---[ end trace e43fd1734d6600df ]--- Signed-off-by: Yanjiang Jin --- V2: no change. drivers/crypto/caam/caamrng.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c index ae31e55..314f73d 100644 --- a/drivers/crypto/caam/caamrng.c +++ b/drivers/crypto/caam/caamrng.c @@ -90,8 +90,8 @@ static inline void rng_unmap_ctx(struct caam_rng_ctx *ctx) struct device *jrdev = ctx->jrdev; if (ctx->sh_desc_dma) - dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN, -DMA_TO_DEVICE); + dma_unmap_single(jrdev, ctx->sh_desc_dma, + desc_bytes(ctx->sh_desc), DMA_TO_DEVICE); rng_unmap_buf(jrdev, &ctx->bufs[0]); rng_unmap_buf(jrdev, &ctx->bufs[1]); } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
