linux-kernel - [PATCH 2/5] powerpc: Map & release OpenCAPI LPC memory

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Message-Id: <20190917014307.30485-3-alastair@au1.ibm.com>
Date:   Tue, 17 Sep 2019 11:42:58 +1000
From:   "Alastair D'Silva" <alastair@....ibm.com>
To:     alastair@...ilva.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Allison Randal <allison@...utok.net>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Vaibhav Jain <vaibhav@...ux.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Gibson <david@...son.dropbear.id.au>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nicholas Piggin <npiggin@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] powerpc: Map & release OpenCAPI LPC memory

From: Alastair D'Silva <alastair@...ilva.org>

Map & release OpenCAPI LPC memory.

Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
---
 arch/powerpc/include/asm/pnv-ocxl.h   |  2 ++
 arch/powerpc/platforms/powernv/ocxl.c | 42 +++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/arch/powerpc/include/asm/pnv-ocxl.h b/arch/powerpc/include/asm/pnv-ocxl.h
index 7de82647e761..f8f8ffb48aa8 100644
--- a/arch/powerpc/include/asm/pnv-ocxl.h
+++ b/arch/powerpc/include/asm/pnv-ocxl.h
@@ -32,5 +32,7 @@ extern int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int pe_handle)
 
 extern int pnv_ocxl_alloc_xive_irq(u32 *irq, u64 *trigger_addr);
 extern void pnv_ocxl_free_xive_irq(u32 irq);
+extern u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size);
+extern void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev);
 
 #endif /* _ASM_PNV_OCXL_H */
diff --git a/arch/powerpc/platforms/powernv/ocxl.c b/arch/powerpc/platforms/powernv/ocxl.c
index 8c65aacda9c8..81393728d6a3 100644
--- a/arch/powerpc/platforms/powernv/ocxl.c
+++ b/arch/powerpc/platforms/powernv/ocxl.c
@@ -475,6 +475,48 @@ void pnv_ocxl_spa_release(void *platform_data)
 }
 EXPORT_SYMBOL_GPL(pnv_ocxl_spa_release);
 
+u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size)
+{
+	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+	struct pnv_phb *phb = hose->private_data;
+	struct pci_dn *pdn = pci_get_pdn(pdev);
+	u32 bdfn = (pdn->busno << 8) | pdn->devfn;
+	u64 base_addr = 0;
+
+	int rc = opal_npu_mem_alloc(phb->opal_id, bdfn, size, &base_addr);
+
+	WARN_ON(rc);
+
+	base_addr = be64_to_cpu(base_addr);
+
+	rc = check_hotplug_memory_addressable(base_addr, base_addr + size);
+	if (rc) {
+		dev_warn(&pdev->dev,
+			 "LPC memory range 0x%llx-0x%llx is not fully addressable",
+			 base_addr, base_addr + size - 1);
+		return 0;
+	}
+
+
+	return base_addr;
+}
+EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_setup);
+
+void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev)
+{
+	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+	struct pnv_phb *phb = hose->private_data;
+	struct pci_dn *pdn = pci_get_pdn(pdev);
+	u32 bdfn;
+	int rc;
+
+	bdfn = (pdn->busno << 8) | pdn->devfn;
+	rc = opal_npu_mem_release(phb->opal_id, bdfn);
+	WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_release);
+
+
 int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int pe_handle)
 {
 	struct spa_data *data = (struct spa_data *) platform_data;
-- 
2.21.0