System gets checkstop if RxFIFO overruns with more requests than the maximum possible number of CRBs in FIFO at the same time. The max number of requests per window is controlled by window credits. So find max CRBs from FIFO size and set it to receive window credits.
Fixes: b0d6c9bab5e4 ("crypto/nx: Add P9 NX support for 842 compression engine") CC: stable@vger.kernel.org # v4.14+ Signed-off-by:Haren Myneni haren@us.ibm.com
diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c index 4acbc47..e78ff5c 100644 --- a/drivers/crypto/nx/nx-842-powernv.c +++ b/drivers/crypto/nx/nx-842-powernv.c @@ -27,8 +27,6 @@ #define WORKMEM_ALIGN (CRB_ALIGN) #define CSB_WAIT_MAX (5000) /* ms */ #define VAS_RETRIES (10) -/* # of requests allowed per RxFIFO at a time. 0 for unlimited */ -#define MAX_CREDITS_PER_RXFIFO (1024)
struct nx842_workmem { /* Below fields must be properly aligned */ @@ -812,7 +810,11 @@ static int __init vas_cfg_coproc_info(struct device_node *dn, int chip_id, rxattr.lnotify_lpid = lpid; rxattr.lnotify_pid = pid; rxattr.lnotify_tid = tid; - rxattr.wcreds_max = MAX_CREDITS_PER_RXFIFO; + /* + * Maximum RX window credits can not be more than #CRBs in + * RxFIFO. Otherwise, can get checkstop if RxFIFO overruns. + */ + rxattr.wcreds_max = fifo_size / CRB_SIZE;
/* * Open a VAS receice window which is used to configure RxFIFO
Haren Myneni haren@linux.vnet.ibm.com wrote:
System gets checkstop if RxFIFO overruns with more requests than the maximum possible number of CRBs in FIFO at the same time. The max number of requests per window is controlled by window credits. So find max CRBs from FIFO size and set it to receive window credits.
Fixes: b0d6c9bab5e4 ("crypto/nx: Add P9 NX support for 842 compression engine") CC: stable@vger.kernel.org # v4.14+ Signed-off-by:Haren Myneni haren@us.ibm.com
I presume this is being picked up by the powerpc tree?
Thanks,
Herbert Xu herbert@gondor.apana.org.au writes:
Haren Myneni haren@linux.vnet.ibm.com wrote:
System gets checkstop if RxFIFO overruns with more requests than the maximum possible number of CRBs in FIFO at the same time. The max number of requests per window is controlled by window credits. So find max CRBs from FIFO size and set it to receive window credits.
Fixes: b0d6c9bab5e4 ("crypto/nx: Add P9 NX support for 842 compression engine") CC: stable@vger.kernel.org # v4.14+ Signed-off-by:Haren Myneni haren@us.ibm.com
I presume this is being picked up by the powerpc tree?
No. I assumed you'd take it because it's in drivers/crypto.
If you want me to take it that's fine, just let me know.
cheers
On Fri, Jun 28, 2019 at 11:43:16AM +1000, Michael Ellerman wrote:
No. I assumed you'd take it because it's in drivers/crypto.
If you want me to take it that's fine, just let me know.
No that's fine Michael. I'll pick it up.
Thanks,
Herbert Xu herbert@gondor.apana.org.au writes:
On Fri, Jun 28, 2019 at 11:43:16AM +1000, Michael Ellerman wrote:
No. I assumed you'd take it because it's in drivers/crypto.
If you want me to take it that's fine, just let me know.
No that's fine Michael. I'll pick it up.
Thanks.
cheers
On Tue, Jun 18, 2019 at 12:09:22PM -0700, Haren Myneni wrote:
System gets checkstop if RxFIFO overruns with more requests than the maximum possible number of CRBs in FIFO at the same time. The max number of requests per window is controlled by window credits. So find max CRBs from FIFO size and set it to receive window credits.
Fixes: b0d6c9bab5e4 ("crypto/nx: Add P9 NX support for 842 compression engine") CC: stable@vger.kernel.org # v4.14+ Signed-off-by:Haren Myneni haren@us.ibm.com
Patch applied. Thanks.
linux-stable-mirror@lists.linaro.org
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Haren Myneni -
Herbert Xu -
Michael Ellerman