cxl: Support to flash a new image on the adapter from a guest (594ff7d0) · Commits · 戴 / test

Documentation/powerpc/cxl.txt

+55 −0

Original line number	Diff line number	Diff line
		@@ -116,6 +116,8 @@ Work Element Descriptor (WED)
		User API
		========

		1. AFU character devices

		For AFUs operating in AFU directed mode, two character device
		files will be created. /dev/cxl/afu0.0m will correspond to a
		master context and /dev/cxl/afu0.0s will correspond to a slave
		@@ -362,6 +364,59 @@ read
		reserved fields:
		For future extensions and padding


		2. Card character device (powerVM guest only)

		In a powerVM guest, an extra character device is created for the
		card. The device is only used to write (flash) a new image on the
		FPGA accelerator. Once the image is written and verified, the
		device tree is updated and the card is reset to reload the updated
		image.

		open
		----

		Opens the device and allocates a file descriptor to be used with
		the rest of the API. The device can only be opened once.

		ioctl
		-----

		CXL_IOCTL_DOWNLOAD_IMAGE:
		CXL_IOCTL_VALIDATE_IMAGE:
		Starts and controls flashing a new FPGA image. Partial
		reconfiguration is not supported (yet), so the image must contain
		a copy of the PSL and AFU(s). Since an image can be quite large,
		the caller may have to iterate, splitting the image in smaller
		chunks.

		Takes a pointer to a struct cxl_adapter_image:
		struct cxl_adapter_image {
		__u64 flags;
		__u64 data;
		__u64 len_data;
		__u64 len_image;
		__u64 reserved1;
		__u64 reserved2;
		__u64 reserved3;
		__u64 reserved4;
		};

		flags:
		These flags indicate which optional fields are present in
		this struct. Currently all fields are mandatory.

		data:
		Pointer to a buffer with part of the image to write to the
		card.

		len_data:
		Size of the buffer pointed to by data.

		len_image:
		Full size of the image.


		Sysfs Class
		===========

drivers/misc/cxl/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -4,7 +4,7 @@ ccflags-$(CONFIG_PPC_WERROR) += -Werror
		cxl-y += main.o file.o irq.o fault.o native.o
		cxl-y += context.o sysfs.o debugfs.o pci.o trace.o
		cxl-y += vphb.o api.o
		cxl-$(CONFIG_PPC_PSERIES) += guest.o of.o hcalls.o
		cxl-$(CONFIG_PPC_PSERIES) += flash.o guest.o of.o hcalls.o
		obj-$(CONFIG_CXL) += cxl.o
		obj-$(CONFIG_CXL_BASE) += base.o

drivers/misc/cxl/base.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -84,3 +84,10 @@ void unregister_cxl_calls(struct cxl_calls *calls)
		synchronize_rcu();
		}
		EXPORT_SYMBOL_GPL(unregister_cxl_calls);

		int cxl_update_properties(struct device_node *dn,
		struct property *new_prop)
		{
		return of_update_property(dn, new_prop);
		}
		EXPORT_SYMBOL_GPL(cxl_update_properties);

drivers/misc/cxl/cxl.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -324,6 +324,10 @@ static const cxl_p2n_reg_t CXL_PSL_WED_An = {0x0A0};
		#define CXL_MODE_TIME_SLICED 0x4
		#define CXL_SUPPORTED_MODES (CXL_MODE_DEDICATED \| CXL_MODE_DIRECTED)

		#define CXL_DEV_MINORS 13 /* 1 control + 4 AFUs * 3 (dedicated/master/shared) */
		#define CXL_CARD_MINOR(adapter) (adapter->adapter_num * CXL_DEV_MINORS)
		#define CXL_DEVT_ADAPTER(dev) (MINOR(dev) / CXL_DEV_MINORS)

		enum cxl_context_status {
		CLOSED,
		OPENED,
		@@ -692,12 +696,14 @@ struct cxl_calls {
		};
		int register_cxl_calls(struct cxl_calls *calls);
		void unregister_cxl_calls(struct cxl_calls *calls);
		int cxl_update_properties(struct device_node dn, struct property new_prop);

		void cxl_remove_adapter_nr(struct cxl *adapter);

		int cxl_alloc_spa(struct cxl_afu *afu);
		void cxl_release_spa(struct cxl_afu *afu);

		dev_t cxl_get_dev(void);
		int cxl_file_init(void);
		void cxl_file_exit(void);
		int cxl_register_adapter(struct cxl *adapter);

drivers/misc/cxl/file.c

+7 −4

Original line number	Diff line number	Diff line
		@@ -26,9 +26,7 @@
		#include "trace.h"

		#define CXL_NUM_MINORS 256 /* Total to reserve */
		#define CXL_DEV_MINORS 13 /* 1 control + 4 AFUs * 3 (dedicated/master/shared) */

		#define CXL_CARD_MINOR(adapter) (adapter->adapter_num * CXL_DEV_MINORS)
		#define CXL_AFU_MINOR_D(afu) (CXL_CARD_MINOR(afu->adapter) + 1 + (3 * afu->slice))
		#define CXL_AFU_MINOR_M(afu) (CXL_AFU_MINOR_D(afu) + 1)
		#define CXL_AFU_MINOR_S(afu) (CXL_AFU_MINOR_D(afu) + 2)
		@@ -36,7 +34,6 @@
		#define CXL_AFU_MKDEV_M(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_M(afu))
		#define CXL_AFU_MKDEV_S(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_S(afu))

		#define CXL_DEVT_ADAPTER(dev) (MINOR(dev) / CXL_DEV_MINORS)
		#define CXL_DEVT_AFU(dev) ((MINOR(dev) % CXL_DEV_MINORS - 1) / 3)

		#define CXL_DEVT_IS_CARD(dev) (MINOR(dev) % CXL_DEV_MINORS == 0)
		@@ -446,7 +443,8 @@ static const struct file_operations afu_master_fops = {

		static char cxl_devnode(struct device dev, umode_t *mode)
		{
		if (CXL_DEVT_IS_CARD(dev->devt)) {
		if (cpu_has_feature(CPU_FTR_HVMODE) &&
		CXL_DEVT_IS_CARD(dev->devt)) {
		/*
		* These minor numbers will eventually be used to program the
		* PSL and AFUs once we have dynamic reprogramming support
		@@ -547,6 +545,11 @@ int cxl_register_adapter(struct cxl *adapter)
		return device_register(&adapter->dev);
		}

		dev_t cxl_get_dev(void)
		{
		return cxl_dev;
		}

		int __init cxl_file_init(void)
		{
		int rc;

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