linux-kernel - [PATCH v9 11/13] powerpc/vas: Do not use default credits for receive window

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Message-ID: <1585776666.10664.455.camel@hbabu-laptop>
Date:   Wed, 01 Apr 2020 14:31:06 -0700
From:   Haren Myneni <haren@...ux.ibm.com>
To:     mpe@...erman.id.au
Cc:     npiggin@...il.com, mikey@...ling.org, herbert@...dor.apana.org.au,
        frederic.barrat@...ibm.com, srikar@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, hch@...radead.org, oohall@...il.com,
        clg@...d.org, sukadev@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, ajd@...ux.ibm.com
Subject: [PATCH v9 11/13] powerpc/vas: Do not use default credits for
 receive window


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@...ux.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 33aaa7a..084e76b 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 efdaa28..32b5261 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