linux-kernel - [PATCH RESEND v2 07/12] coco: host: arm64: Add helper to stop and tear down an RMM pdev

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Message-ID: <20251027095602.1154418-8-aneesh.kumar@kernel.org>
Date: Mon, 27 Oct 2025 15:25:57 +0530
From: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
To: linux-coco@...ts.linux.dev,
	kvmarm@...ts.linux.dev
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dan.j.williams@...el.com,
	aik@....com,
	lukas@...ner.de,
	Samuel Ortiz <sameo@...osinc.com>,
	Xu Yilun <yilun.xu@...ux.intel.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Suzuki K Poulose <Suzuki.Poulose@....com>,
	Steven Price <steven.price@....com>,
	Bjorn Helgaas <helgaas@...nel.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>,
	Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Subject: [PATCH RESEND v2 07/12] coco: host: arm64: Add helper to stop and tear down an RMM pdev

- describe the RMI_PDEV_STOP/RMI_PDEV_DESTROY SMC IDs and provide
  wrappers in rmi_cmds.h
- implement pdev_stop_and_destroy() so the host driver stops the pdev,
  waits for it to reach RMI_PDEV_STOPPED, destroys it, frees auxiliary
  granules, and drops the delegated page

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
---
 arch/arm64/include/asm/rmi_cmds.h       | 18 +++++++++++++++
 arch/arm64/include/asm/rmi_smc.h        |  2 ++
 drivers/virt/coco/arm-cca-host/rmi-da.c | 30 +++++++++++++++++++++++++
 drivers/virt/coco/arm-cca-host/rmi-da.h |  1 +
 4 files changed, 51 insertions(+)

diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h
index b86bf15afcda..f10a0dcaa308 100644
--- a/arch/arm64/include/asm/rmi_cmds.h
+++ b/arch/arm64/include/asm/rmi_cmds.h
@@ -556,4 +556,22 @@ static inline unsigned long rmi_pdev_abort(unsigned long pdev_phys)
 	return res.a0;
 }
 
+static inline unsigned long rmi_pdev_stop(unsigned long pdev_phys)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_PDEV_STOP, pdev_phys, &res);
+
+	return res.a0;
+}
+
+static inline unsigned long rmi_pdev_destroy(unsigned long pdev_phys)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_PDEV_DESTROY, pdev_phys, &res);
+
+	return res.a0;
+}
+
 #endif /* __ASM_RMI_CMDS_H */
diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h
index 53e46e24c921..6eb6f7e4b77f 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -50,7 +50,9 @@
 #define SMC_RMI_PDEV_ABORT		SMC_RMI_CALL(0x0174)
 #define SMC_RMI_PDEV_COMMUNICATE        SMC_RMI_CALL(0x0175)
 #define SMC_RMI_PDEV_CREATE             SMC_RMI_CALL(0x0176)
+#define SMC_RMI_PDEV_DESTROY		SMC_RMI_CALL(0x0177)
 #define SMC_RMI_PDEV_GET_STATE		SMC_RMI_CALL(0x0178)
+#define SMC_RMI_PDEV_STOP		SMC_RMI_CALL(0x017c)
 
 #define RMI_ABI_MAJOR_VERSION	1
 #define RMI_ABI_MINOR_VERSION	0
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.c b/drivers/virt/coco/arm-cca-host/rmi-da.c
index 592abe0dd252..644609618a7a 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.c
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.c
@@ -412,3 +412,33 @@ int pdev_ide_setup(struct pci_dev *pdev)
 {
 	return submit_pdev_comm_work(pdev, RMI_PDEV_NEEDS_KEY);
 }
+
+void pdev_stop_and_destroy(struct pci_dev *pdev)
+{
+	unsigned long ret;
+	struct cca_host_pf0_dsc *pf0_dsc = to_cca_pf0_dsc(pdev);
+	phys_addr_t rmm_pdev_phys = virt_to_phys(pf0_dsc->rmm_pdev);
+
+	ret = rmi_pdev_stop(rmm_pdev_phys);
+	if (WARN_ON(ret != RMI_SUCCESS))
+		return;
+
+	submit_pdev_comm_work(pdev, RMI_PDEV_STOPPED);
+
+	ret = rmi_pdev_destroy(rmm_pdev_phys);
+	if (WARN_ON(ret != RMI_SUCCESS))
+		return;
+
+	kfree(pf0_dsc->cert_chain.public_key);
+	kvfree(pf0_dsc->cert_chain.cache);
+	kvfree(pf0_dsc->vca);
+	pf0_dsc->cert_chain.cache = NULL;
+	pf0_dsc->vca = NULL;
+
+	/* Free the aux granules */
+	free_aux_pages(pf0_dsc->num_aux, pf0_dsc->aux);
+	pf0_dsc->num_aux = 0;
+	if (!rmi_granule_undelegate(rmm_pdev_phys))
+		free_page((unsigned long)pf0_dsc->rmm_pdev);
+	pf0_dsc->rmm_pdev = NULL;
+}
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.h b/drivers/virt/coco/arm-cca-host/rmi-da.h
index 1d513e0b74d9..e556ccecc1cb 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.h
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.h
@@ -104,6 +104,7 @@ static inline struct cca_host_comm_data *to_cca_comm_data(struct pci_dev *pdev)
 }
 
 int pdev_create(struct pci_dev *pdev);
+void pdev_stop_and_destroy(struct pci_dev *pdev);
 void pdev_communicate_work(struct work_struct *work);
 int pdev_ide_setup(struct pci_dev *pdev);
 #endif
-- 
2.43.0