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Sun, 21 Jun 2026 23:42:18 -0700 (PDT) Date: Sun, 21 Jun 2026 23:42:15 -0700 From: Charlie Jenkins To: Atish Patra Cc: James Clark , Rob Herring , Arnaldo Carvalho de Melo , Jiri Olsa , Will Deacon , Mark Rutland , Anup Patel , Namhyung Kim , Paul Walmsley , Krzysztof Kozlowski , Ian Rogers , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Conor Dooley , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v6 04/21] RISC-V: Define indirect CSR access helpers Message-ID: References: <20260608-counter_delegation-v6-0-285b72ed65a9@meta.com> <20260608-counter_delegation-v6-4-285b72ed65a9@meta.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260608-counter_delegation-v6-4-285b72ed65a9@meta.com> On Mon, Jun 08, 2026 at 11:01:18PM -0700, Atish Patra wrote: > From: Atish Patra > > The indriect CSR requires multiple instructions to read/write CSR. indirect > Add a few helper functions for ease of usage. > > Signed-off-by: Atish Patra > --- > arch/riscv/include/asm/csr_ind.h | 44 ++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 44 insertions(+) > > diff --git a/arch/riscv/include/asm/csr_ind.h b/arch/riscv/include/asm/csr_ind.h > new file mode 100644 > index 000000000000..6fd7d44dc640 > --- /dev/null > +++ b/arch/riscv/include/asm/csr_ind.h > @@ -0,0 +1,44 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Copyright (C) 2024 Rivos Inc. I don't think it makes sense to introduce this copyright in new commits. - Charlie > + */ > + > +#ifndef _ASM_RISCV_CSR_IND_H > +#define _ASM_RISCV_CSR_IND_H > + > +#include > + > +#include > + > +#define csr_ind_read(iregcsr, iselbase, iseloff) ({ \ > + unsigned long __value = 0; \ > + unsigned long __flags; \ > + local_irq_save(__flags); \ > + csr_write(CSR_ISELECT, (iselbase) + (iseloff)); \ > + __value = csr_read(iregcsr); \ > + local_irq_restore(__flags); \ > + __value; \ > +}) > + > +#define csr_ind_write(iregcsr, iselbase, iseloff, value) ({ \ > + unsigned long __flags; \ > + local_irq_save(__flags); \ > + csr_write(CSR_ISELECT, (iselbase) + (iseloff)); \ > + csr_write(iregcsr, (value)); \ > + local_irq_restore(__flags); \ > +}) > + > +#define csr_ind_warl(iregcsr, iselbase, iseloff, warl_val) ({ \ > + unsigned long __old_val = 0, __value = 0; \ > + unsigned long __flags; \ > + local_irq_save(__flags); \ > + csr_write(CSR_ISELECT, (iselbase) + (iseloff)); \ > + __old_val = csr_read(iregcsr); \ > + csr_write(iregcsr, (warl_val)); \ > + __value = csr_read(iregcsr); \ > + csr_write(iregcsr, __old_val); \ > + local_irq_restore(__flags); \ > + __value; \ > +}) > + > +#endif > > -- > 2.53.0-Meta > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv >