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From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: alastair@d-silva.org
Cc: "Oscar Salvador" <osalvador@suse.com>,
	"Michal Hocko" <mhocko@suse.com>,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	"David Hildenbrand" <david@redhat.com>,
	"Alexey Kardashevskiy" <aik@ozlabs.ru>,
	"Wei Yang" <richard.weiyang@gmail.com>,
	"Keith Busch" <keith.busch@intel.com>,
	"Masahiro Yamada" <yamada.masahiro@socionext.com>,
	"Paul Mackerras" <paulus@samba.org>,
	"Ira Weiny" <ira.weiny@intel.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Pavel Tatashin" <pasha.tatashin@soleen.com>,
	"Dave Jiang" <dave.jiang@intel.com>,
	linux-nvdimm@lists.01.org,
	"Vishal Verma" <vishal.l.verma@intel.com>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Anju T Sudhakar" <anju@linux.vnet.ibm.com>,
	"Allison Randal" <allison@lohutok.net>,
	"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
	"Andrew Donnellan" <ajd@linux.ibm.com>,
	"Arnd Bergmann" <arnd@arndb.de>, "Greg Kurz" <groug@kaod.org>,
	"Qian Cai" <cai@lca.pw>, "Cédric Le Goater" <clg@kaod.org>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Hari Bathini" <hbathini@linux.ibm.com>,
	"David Gibson" <david@gibson.dropbear.id.au>,
	linux-mm@kvack.org,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org,
	"Vasant Hegde" <hegdevasant@linux.vnet.ibm.com>,
	"Frederic Barrat" <fbarrat@linux.ibm.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 04/10] powerpc: Map & release OpenCAPI LPC memory
Date: Fri, 25 Oct 2019 15:46:59 +1100
Message-ID: <20191025044721.16617-5-alastair@au1.ibm.com> (raw)
In-Reply-To: <20191025044721.16617-1-alastair@au1.ibm.com>

From: Alastair D'Silva <alastair@d-silva.org>

This patch adds platform support to map & release LPC memory.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
 arch/powerpc/include/asm/pnv-ocxl.h   |  2 ++
 arch/powerpc/platforms/powernv/ocxl.c | 41 +++++++++++++++++++++++++++
 include/linux/memory_hotplug.h        |  5 ++++
 mm/memory_hotplug.c                   |  3 +-
 4 files changed, 50 insertions(+), 1 deletion(-)

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..c6d4234e0aba 100644
--- a/arch/powerpc/platforms/powernv/ocxl.c
+++ b/arch/powerpc/platforms/powernv/ocxl.c
@@ -475,6 +475,47 @@ 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;
+	u32 bdfn = (pdev->bus->number << 8) | pdev->devfn;
+	u64 base_addr = 0;
+	int rc;
+
+	rc = opal_npu_mem_alloc(phb->opal_id, bdfn, size, &base_addr);
+	if (rc) {
+		dev_warn(&pdev->dev,
+			 "OPAL could not allocate LPC memory, rc=%d\n", rc);
+		return 0;
+	}
+
+	base_addr = be64_to_cpu(base_addr);
+
+	rc = check_hotplug_memory_addressable(base_addr >> PAGE_SHIFT,
+					      size >> PAGE_SHIFT);
+	if (rc)
+		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;
+	u32 bdfn = (pdev->bus->number << 8) | pdev->devfn;
+	int rc;
+
+	rc = opal_npu_mem_release(phb->opal_id, bdfn);
+	if (rc)
+		dev_warn(&pdev->dev,
+			 "OPAL reported rc=%d when releasing LPC memory\n", 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;
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index f46ea71b4ffd..3f5f1a642abe 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -339,6 +339,11 @@ static inline int remove_memory(int nid, u64 start, u64 size)
 static inline void __remove_memory(int nid, u64 start, u64 size) {}
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
+#if CONFIG_MEMORY_HOTPLUG_SPARSE
+int check_hotplug_memory_addressable(unsigned long pfn,
+		unsigned long nr_pages);
+#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
+
 extern void __ref free_area_init_core_hotplug(int nid);
 extern int __add_memory(int nid, u64 start, u64 size);
 extern int add_memory(int nid, u64 start, u64 size);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 2cecf07b396f..b39827dbd071 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -278,7 +278,7 @@ static int check_pfn_span(unsigned long pfn, unsigned long nr_pages,
 	return 0;
 }
 
-static int check_hotplug_memory_addressable(unsigned long pfn,
+int check_hotplug_memory_addressable(unsigned long pfn,
 					    unsigned long nr_pages)
 {
 	const u64 max_addr = PFN_PHYS(pfn + nr_pages) - 1;
@@ -294,6 +294,7 @@ static int check_hotplug_memory_addressable(unsigned long pfn,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(check_hotplug_memory_addressable);
 
 /*
  * Reasonably generic function for adding memory.  It is
-- 
2.21.0


  parent reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-25  4:46 [PATCH 00/10] Add support for OpenCAPI SCM devices Alastair D'Silva
2019-10-25  4:46 ` [PATCH 01/10] memory_hotplug: Add a bounds check to __add_pages Alastair D'Silva
2019-10-25  4:46 ` [PATCH 02/10] nvdimm: remove prototypes for nonexistent functions Alastair D'Silva
2019-10-27 23:41   ` Andrew Donnellan
2019-11-07 17:56   ` Frederic Barrat
2019-11-15  4:30   ` Dan Williams
2019-10-25  4:46 ` [PATCH 03/10] powerpc: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2019-11-07 17:57   ` Frederic Barrat
2019-10-25  4:46 ` Alastair D'Silva [this message]
2019-10-27 21:24   ` [PATCH 04/10] powerpc: Map & release OpenCAPI LPC memory kbuild test robot
2019-10-27 21:59   ` kbuild test robot
2019-10-28  2:34   ` kbuild test robot
2019-10-29  1:49   ` Andrew Donnellan
2019-10-29  2:44     ` Alastair D'Silva
2019-10-29  2:47       ` Andrew Donnellan
2019-11-07 17:59   ` Frederic Barrat
2019-11-11  9:34   ` Aneesh Kumar K.V
2019-10-25  4:47 ` [PATCH 05/10] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2019-11-07 18:02   ` Frederic Barrat
2019-10-25  4:47 ` [PATCH 06/10] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2019-11-07 18:05   ` Frederic Barrat
2019-10-25  4:47 ` [PATCH 07/10] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2019-11-06  3:10   ` Andrew Donnellan
2019-11-07 18:18   ` Frederic Barrat
2019-10-25  4:47 ` [PATCH 08/10] nvdimm: Add driver for OpenCAPI Storage Class Memory Alastair D'Silva
2019-10-27 22:19   ` kbuild test robot
2019-10-27 22:53   ` kbuild test robot
2019-10-28  1:12   ` [RFC PATCH] nvdimm: scm_get() can be static kbuild test robot
2019-11-11 11:14   ` [PATCH 08/10] nvdimm: Add driver for OpenCAPI Storage Class Memory Aneesh Kumar K.V
2019-11-12  5:37     ` Dan Williams
2019-11-12  5:41       ` Dan Williams
2019-11-14 13:41   ` Frederic Barrat
2019-11-14 16:35     ` Dan Williams
2019-11-18 23:47       ` Andrew Donnellan
2019-11-19  0:04         ` Dan Williams
2019-11-19  2:48         ` Alastair D'Silva
2019-11-19  3:26           ` Andrew Donnellan
2019-11-19  4:41             ` Dan Williams
2019-11-18 23:01     ` Alastair D'Silva
2019-10-25  4:47 ` [PATCH 09/10] powerpc: Enable OpenCAPI Storage Class Memory driver on bare metal Alastair D'Silva
2019-10-28  2:43   ` Oliver O'Halloran
2019-11-08  7:10   ` Frederic Barrat
2019-11-11  9:46   ` Aneesh Kumar K.V
2019-10-25  4:47 ` [PATCH 10/10] ocxl: Conditionally bind SCM devices to the generic OCXL driver Alastair D'Silva
2019-10-26  6:43   ` Christoph Hellwig
2019-11-06  3:46   ` Andrew Donnellan
2019-11-07 18:08   ` Frederic Barrat
2019-11-08  0:37     ` Alastair D'Silva
2019-10-25  7:57 ` [PATCH 00/10] Add support for OpenCAPI SCM devices Geert Uytterhoeven

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