From: Haren Myneni <haren@linux.ibm.com>
To: mpe@ellerman.id.au
Cc: mikey@neuling.org, herbert@gondor.apana.org.au,
npiggin@gmail.com, hch@infradead.org, oohall@gmail.com,
sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
ajd@linux.ibm.com
Subject: [PATCH V7 11/14] powerpc/vas: Do not use default credits for receive window
Date: Fri, 06 Mar 2020 12:18:07 -0800 [thread overview]
Message-ID: <1583525887.9256.16.camel@hbabu-laptop> (raw)
In-Reply-To: <1583525239.9256.5.camel@hbabu-laptop>
System checkstops if RxFIFO overruns with more requests than the
maximum possible number of CRBs allowed in FIFO at any time. So
max credits value (rxattr.wcreds_max) is set and is passed to
vas_rx_win_open() by the the driver.
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
---
arch/powerpc/platforms/powernv/vas-window.c | 4 ++--
arch/powerpc/platforms/powernv/vas.h | 2 --
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c
index 7587258..427a884 100644
--- a/arch/powerpc/platforms/powernv/vas-window.c
+++ b/arch/powerpc/platforms/powernv/vas-window.c
@@ -772,7 +772,7 @@ static bool rx_win_args_valid(enum vas_cop_type cop,
if (attr->rx_fifo_size > VAS_RX_FIFO_SIZE_MAX)
return false;
- if (attr->wcreds_max > VAS_RX_WCREDS_MAX)
+ if (!attr->wcreds_max)
return false;
if (attr->nx_win) {
@@ -877,7 +877,7 @@ struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop,
rxwin->nx_win = rxattr->nx_win;
rxwin->user_win = rxattr->user_win;
rxwin->cop = cop;
- rxwin->wcreds_max = rxattr->wcreds_max ?: VAS_WCREDS_DEFAULT;
+ rxwin->wcreds_max = rxattr->wcreds_max;
init_winctx_for_rxwin(rxwin, rxattr, &winctx);
init_winctx_regs(rxwin, &winctx);
diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h
index 16aa8ec..bc728d7 100644
--- a/arch/powerpc/platforms/powernv/vas.h
+++ b/arch/powerpc/platforms/powernv/vas.h
@@ -101,11 +101,9 @@
/*
* Initial per-process credits.
* Max send window credits: 4K-1 (12-bits in VAS_TX_WCRED)
- * Max receive window credits: 64K-1 (16 bits in VAS_LRX_WCRED)
*
* TODO: Needs tuning for per-process credits
*/
-#define VAS_RX_WCREDS_MAX ((64 << 10) - 1)
#define VAS_TX_WCREDS_MAX ((4 << 10) - 1)
#define VAS_WCREDS_DEFAULT (1 << 10)
--
1.8.3.1
next prev parent reply other threads:[~2020-03-06 20:27 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-06 20:07 [PATCH V7 00/14] powerpc/vas: Page fault handling for user space NX requests Haren Myneni
2020-03-06 20:12 ` [PATCH V7 01/14] powerpc/xive: Define xive_native_alloc_irq_on_chip() Haren Myneni
2020-03-06 20:12 ` [PATCH V7 02/14] powerpc/xive: Define xive_native_alloc_get_irq_info() Haren Myneni
2020-03-06 20:13 ` [PATCH V7 03/14] powerpc/vas: Define nx_fault_stamp in coprocessor_request_block Haren Myneni
2020-03-06 20:13 ` [PATCH V7 04/14] powerpc/vas: Alloc and setup IRQ and trigger port address Haren Myneni
2020-03-06 20:14 ` [PATCH V7 05/14] powerpc/vas: Setup fault window per VAS instance Haren Myneni
2020-03-06 20:14 ` [PATCH V7 06/14] powerpc/vas: Setup thread IRQ handler " Haren Myneni
2020-03-06 20:15 ` [PATCH V7 07/14] powerpc/vas: Register NX with fault window ID and IRQ port value Haren Myneni
2020-03-06 20:16 ` [PATCH V7 08/14] powerpc/vas: Take reference to PID and mm for user space windows Haren Myneni
2020-03-17 4:09 ` Michael Ellerman
2020-03-17 19:13 ` Haren Myneni
2020-03-06 20:16 ` [PATCH V7 09/14] powerpc/vas: Update CSB and notify process for fault CRBs Haren Myneni
2020-03-17 5:28 ` Michael Ellerman
2020-03-17 19:27 ` Haren Myneni
2020-03-23 0:06 ` Nicholas Piggin
2020-03-23 1:06 ` Haren Myneni
2020-03-06 20:17 ` [PATCH V7 10/14] powerpc/vas: Print CRB and FIFO values Haren Myneni
2020-03-06 20:18 ` Haren Myneni [this message]
2020-03-06 20:18 ` [PATCH V7 12/14] powerpc/vas: Return credits after handling fault Haren Myneni
2020-03-06 20:19 ` [PATCH V7 13/14] powerpc/vas: Display process stuck message Haren Myneni
2020-03-06 20:20 ` [PATCH V7 14/14] powerpc/vas: Free send window in VAS instance after credits returned Haren Myneni
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