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Date: Fri, 13 Mar 2020 16:46:35 +0800 From: Shaokun Zhang <zhangshaokun@...ilicon.com> To: <linux-kernel@...r.kernel.org> CC: Nianyao Tang <tangnianyao@...wei.com>, Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>, Shaokun Zhang <zhangshaokun@...ilicon.com> Subject: [PATCH] irqchip/gic-v4: Fix non-stick page size error for setup GITS_BASER From: Nianyao Tang <tangnianyao@...wei.com> There is an error when ITS is probed if hw GITS_BASER<2> only supports psz=SZ_16K while GITS_BASER<1> only supports psz=SZ_4K. In its_alloc_tables, it has updated GITS_BASER<1>.psz and uses psz=SZ_4K for setup GITS_BASER<2>, and would fail in writing GITS_BASER<2>.psz=SZ_4K. 4K PAGE is the smallest and shall stop retry for other page sizes. That latter GITS_BASER<n>.psz is larger than former, will lead to similar error. [ 0.000000] ITS@...000000660000000: Virtual CPUs doesn't stick: ba1f0824404004ff ba1f0824404005ff [ 0.000000] ITS@...000000660000000: failed probing (-6) [ 0.000000] ITS: No ITS available, not enabling LPIs >From GIC SPEC document, it's allowed for this implematation, the latter GITS_BASER<n>.psz is larger than the former. Let's fix this error with following patch. Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Marc Zyngier <maz@...nel.org> Signed-off-by: Nianyao Tang <tangnianyao@...wei.com> Signed-off-by: Shaokun Zhang <zhangshaokun@...ilicon.com> --- drivers/irqchip/irq-gic-v3-its.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 83b1186..59bf8d6 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -2341,7 +2341,6 @@ static int its_alloc_tables(struct its_node *its) } /* Update settings which will be used for next BASERn */ - psz = baser->psz; cache = baser->val & GITS_BASER_CACHEABILITY_MASK; shr = baser->val & GITS_BASER_SHAREABILITY_MASK; } -- 1.9.1
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