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Wed, 06 Mar 2024 13:11:20 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 426DBKUi019104; Wed, 6 Mar 2024 13:11:20 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-msarkar-hyd.qualcomm.com [10.213.111.194]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 426DBJXV019103; Wed, 06 Mar 2024 13:11:20 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 3891782) id 90A5326B8; Wed, 6 Mar 2024 18:41:18 +0530 (+0530) From: Mrinmay Sarkar To: andersson@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, konrad.dybcio@linaro.org, manivannan.sadhasivam@linaro.org, robh@kernel.org Cc: quic_shazhuss@quicinc.com, quic_nitegupt@quicinc.com, quic_ramkri@quicinc.com, quic_nayiluri@quicinc.com, quic_krichai@quicinc.com, quic_vbadigan@quicinc.com, quic_schintav@quicinc.com, Mrinmay Sarkar , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Bjorn Helgaas , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org Subject: [PATCH v6 2/3] PCI: qcom-ep: Override NO_SNOOP attribute for SA8775P EP Date: Wed, 6 Mar 2024 18:41:11 +0530 Message-Id: <1709730673-6699-3-git-send-email-quic_msarkar@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1709730673-6699-1-git-send-email-quic_msarkar@quicinc.com> References: <1709730673-6699-1-git-send-email-quic_msarkar@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 3xUhdoOt2LHp5EAG4q_wu0WbCZBVKjl2 X-Proofpoint-ORIG-GUID: 3xUhdoOt2LHp5EAG4q_wu0WbCZBVKjl2 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-06_08,2024-03-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=999 impostorscore=0 adultscore=0 bulkscore=0 mlxscore=0 phishscore=0 clxscore=1015 priorityscore=1501 spamscore=0 malwarescore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2402120000 definitions=main-2403060105 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Due to some hardware changes, SA8775P has set the NO_SNOOP attribute in its TLP for all the PCIe controllers. NO_SNOOP attribute when set, the requester is indicating that no cache coherency issues exist for the addressed memory on the host i.e., memory is not cached. But in reality, requester cannot assume this unless there is a complete control/visibility over the addressed memory on the host. And worst case, if the memory is cached on the host, it may lead to memory corruption issues. It should be noted that the caching of memory on the host is not solely dependent on the NO_SNOOP attribute in TLP. So to avoid the corruption, this patch overrides the NO_SNOOP attribute by setting the PCIE_PARF_NO_SNOOP_OVERIDE register. This patch is not needed for other upstream supported platforms since they do not set NO_SNOOP attribute by default. Signed-off-by: Mrinmay Sarkar Reviewed-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 89d06a3..aa8e979 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -47,6 +47,7 @@ #define PARF_DBI_BASE_ADDR_HI 0x354 #define PARF_SLV_ADDR_SPACE_SIZE 0x358 #define PARF_SLV_ADDR_SPACE_SIZE_HI 0x35c +#define PARF_NO_SNOOP_OVERIDE 0x3d4 #define PARF_ATU_BASE_ADDR 0x634 #define PARF_ATU_BASE_ADDR_HI 0x638 #define PARF_SRIS_MODE 0x644 @@ -86,6 +87,10 @@ #define PARF_DEBUG_INT_CFG_BUS_MASTER_EN BIT(2) #define PARF_DEBUG_INT_RADM_PM_TURNOFF BIT(3) +/* PARF_NO_SNOOP_OVERIDE register fields */ +#define WR_NO_SNOOP_OVERIDE_EN BIT(1) +#define RD_NO_SNOOP_OVERIDE_EN BIT(3) + /* PARF_DEVICE_TYPE register fields */ #define PARF_DEVICE_TYPE_EP 0x0 @@ -152,9 +157,11 @@ enum qcom_pcie_ep_link_status { /** * struct qcom_pcie_ep_cfg - Per SoC config struct * @hdma_support: HDMA support on this SoC + * @override_no_snoop: Override NO_SNOOP attribute in TLP to enable cache snooping */ struct qcom_pcie_ep_cfg { bool hdma_support; + bool override_no_snoop; }; /** @@ -175,6 +182,7 @@ struct qcom_pcie_ep_cfg { * @num_clks: PCIe clocks count * @perst_en: Flag for PERST enable * @perst_sep_en: Flag for PERST separation enable + * @cfg: PCIe EP config struct * @link_status: PCIe Link status * @global_irq: Qualcomm PCIe specific Global IRQ * @perst_irq: PERST# IRQ @@ -202,6 +210,7 @@ struct qcom_pcie_ep { u32 perst_en; u32 perst_sep_en; + const struct qcom_pcie_ep_cfg *cfg; enum qcom_pcie_ep_link_status link_status; int global_irq; int perst_irq; @@ -497,6 +506,11 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci) val |= BIT(8); writel_relaxed(val, pcie_ep->parf + PARF_LTSSM); + /* Override NO_SNOOP attribute in TLP to enable cache snooping */ + if (pcie_ep->cfg && pcie_ep->cfg->override_no_snoop) + writel_relaxed(WR_NO_SNOOP_OVERIDE_EN | RD_NO_SNOOP_OVERIDE_EN, + pcie_ep->parf + PARF_NO_SNOOP_OVERIDE); + return 0; err_disable_resources: @@ -811,7 +825,6 @@ static const struct dw_pcie_ep_ops pci_ep_ops = { static int qcom_pcie_ep_probe(struct platform_device *pdev) { - const struct qcom_pcie_ep_cfg *cfg; struct device *dev = &pdev->dev; struct qcom_pcie_ep *pcie_ep; char *name; @@ -826,8 +839,8 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev) pcie_ep->pci.ep.ops = &pci_ep_ops; pcie_ep->pci.edma.nr_irqs = 1; - cfg = of_device_get_match_data(dev); - if (cfg && cfg->hdma_support) { + pcie_ep->cfg = of_device_get_match_data(dev); + if (pcie_ep->cfg && pcie_ep->cfg->hdma_support) { pcie_ep->pci.edma.ll_wr_cnt = 8; pcie_ep->pci.edma.ll_rd_cnt = 8; pcie_ep->pci.edma.mf = EDMA_MF_HDMA_NATIVE; @@ -893,6 +906,7 @@ static void qcom_pcie_ep_remove(struct platform_device *pdev) static const struct qcom_pcie_ep_cfg cfg_1_34_0 = { .hdma_support = true, + .override_no_snoop = true, }; static const struct of_device_id qcom_pcie_ep_match[] = {