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Wed, 11 Nov 2020 06:02:44 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 35212C43395; Wed, 11 Nov 2020 06:02:43 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id 1B6CAC433F0; Wed, 11 Nov 2020 06:02:42 +0000 (UTC) MIME-Version: 1.0 Date: Wed, 11 Nov 2020 11:32:42 +0530 From: Sai Prakash Ranjan To: Will Deacon Subject: Re: [PATCHv7 1/7] iommu/io-pgtable-arm: Add support to use system cache In-Reply-To: <20201110121855.GD16239@willie-the-truck> References: <1d4979c0dcf649c5717605c598067b4b225ab9de.1604048969.git.saiprakash.ranjan@codeaurora.org> <20201110121855.GD16239@willie-the-truck> Message-ID: <329542c0c09054a46fa8d6d8f92ad739@codeaurora.org> X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201111_010322_035115_1002792F X-CRM114-Status: GOOD ( 21.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Joerg Roedel , Jordan Crouse , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Rob Clark , Akhil P Oommen , dri-devel@lists.freedesktop.org, "Kristian H . Kristensen" , Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2020-11-10 17:48, Will Deacon wrote: > On Fri, Oct 30, 2020 at 02:53:08PM +0530, Sai Prakash Ranjan wrote: >> Add a quirk IO_PGTABLE_QUIRK_SYS_CACHE to override the >> attributes set in TCR for the page table walker when >> using system cache. >> >> Signed-off-by: Sai Prakash Ranjan >> --- >> drivers/iommu/io-pgtable-arm.c | 7 ++++++- >> include/linux/io-pgtable.h | 4 ++++ >> 2 files changed, 10 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/iommu/io-pgtable-arm.c >> b/drivers/iommu/io-pgtable-arm.c >> index a7a9bc08dcd1..a356caf1683a 100644 >> --- a/drivers/iommu/io-pgtable-arm.c >> +++ b/drivers/iommu/io-pgtable-arm.c >> @@ -761,7 +761,8 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg >> *cfg, void *cookie) >> >> if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | >> IO_PGTABLE_QUIRK_NON_STRICT | >> - IO_PGTABLE_QUIRK_ARM_TTBR1)) >> + IO_PGTABLE_QUIRK_ARM_TTBR1 | >> + IO_PGTABLE_QUIRK_SYS_CACHE)) >> return NULL; >> >> data = arm_lpae_alloc_pgtable(cfg); >> @@ -773,6 +774,10 @@ arm_64_lpae_alloc_pgtable_s1(struct >> io_pgtable_cfg *cfg, void *cookie) >> tcr->sh = ARM_LPAE_TCR_SH_IS; >> tcr->irgn = ARM_LPAE_TCR_RGN_WBWA; >> tcr->orgn = ARM_LPAE_TCR_RGN_WBWA; >> + } else if (cfg->quirks & IO_PGTABLE_QUIRK_SYS_CACHE) { >> + tcr->sh = ARM_LPAE_TCR_SH_OS; >> + tcr->irgn = ARM_LPAE_TCR_RGN_NC; >> + tcr->orgn = ARM_LPAE_TCR_RGN_WBWA; > > Given that this only applies in the case where then page-table walker > is > non-coherent, I think we'd be better off renaming the quirk to > something > like IO_PGTABLE_QUIRK_ARM_OUTER_WBWA and then rejecting it in the > non-coherent case. > Do you mean like below? diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index a7a9bc08dcd1..94de1f71db42 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -776,7 +776,10 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) } else { tcr->sh = ARM_LPAE_TCR_SH_OS; tcr->irgn = ARM_LPAE_TCR_RGN_NC; - tcr->orgn = ARM_LPAE_TCR_RGN_NC; + if (!(cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA)) + tcr->orgn = ARM_LPAE_TCR_RGN_NC; + else + tcr->orgn = ARM_LPAE_TCR_RGN_WBWA; } tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1; Thanks, Sai -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel