cxl: New hcalls to support cxl adapters

The hypervisor calls provide an interface with a coherent platform
facility and function. It matches version 0.16 of the 'PAPR changes'
document.

The following hcalls are supported:
H_ATTACH_CA_PROCESS    Attach a process element to a coherent platform
                       function.
H_DETACH_CA_PROCESS    Detach a process element from a coherent
                       platform function.
H_CONTROL_CA_FUNCTION  Allow the partition to manipulate or query
                       certain coherent platform function behaviors.
H_COLLECT_CA_INT_INFO  Collect interrupt info about a coherent.
                       platform function after an interrupt occurred
H_CONTROL_CA_FAULTS    Control the operation of a coherent platform
                       function after a fault occurs.
H_DOWNLOAD_CA_FACILITY Support for downloading a base adapter image to
                       the coherent platform facility, and for
                       validating the entire image after the download.
H_CONTROL_CA_FACILITY  Allow the partition to manipulate or query
                       certain coherent platform facility behaviors.
Co-authored-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Manoj Kumar <manoj@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/misc/cxl/cxl.h

@@ -688,6 +688,7 @@ void cxl_prefault(struct cxl_context *ctx, u64 wed);
 
 struct cxl *get_cxl_adapter(int num);
 int cxl_alloc_sst(struct cxl_context *ctx);
+void cxl_dump_debug_buffer(void *addr, size_t size);
 
 void init_cxl_native(void);
 
@@ -701,16 +702,34 @@ unsigned int cxl_map_irq(struct cxl *adapter, irq_hw_number_t hwirq,
 void cxl_unmap_irq(unsigned int virq, void *cookie);
 int __detach_context(struct cxl_context *ctx);
 
-/* This matches the layout of the H_COLLECT_CA_INT_INFO retbuf */
+/*
+ * This must match the layout of the H_COLLECT_CA_INT_INFO retbuf defined
+ * in PAPR.
+ * A word about endianness: a pointer to this structure is passed when
+ * calling the hcall. However, it is not a block of memory filled up by
+ * the hypervisor. The return values are found in registers, and copied
+ * one by one when returning from the hcall. See the end of the call to
+ * plpar_hcall9() in hvCall.S
+ * As a consequence:
+ * - we don't need to do any endianness conversion
+ * - the pid and tid are an exception. They are 32-bit values returned in
+ *   the same 64-bit register. So we do need to worry about byte ordering.
+ */
 struct cxl_irq_info {
 	u64 dsisr;
 	u64 dar;
 	u64 dsr;
+#ifndef CONFIG_CPU_LITTLE_ENDIAN
 	u32 pid;
 	u32 tid;
+#else
+	u32 tid;
+	u32 pid;
+#endif
 	u64 afu_err;
 	u64 errstat;
-	u64 padding[3]; /* to match the expected retbuf size for plpar_hcall9 */
+	u64 proc_handle;
+	u64 padding[2]; /* to match the expected retbuf size for plpar_hcall9 */
 };
 
 void cxl_assign_psn_space(struct cxl_context *ctx);

drivers/misc/cxl/hcalls.c

+/*
+ * Copyright 2015 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <asm/hvcall.h>
+#include <asm/byteorder.h>
+#include "hcalls.h"
+
+#define CXL_HCALL_TIMEOUT 60000
+#define CXL_HCALL_TIMEOUT_DOWNLOAD 120000
+
+#define H_ATTACH_CA_PROCESS    0x344
+#define H_CONTROL_CA_FUNCTION  0x348
+#define H_DETACH_CA_PROCESS    0x34C
+#define H_COLLECT_CA_INT_INFO  0x350
+#define H_CONTROL_CA_FAULTS    0x354
+#define H_DOWNLOAD_CA_FUNCTION 0x35C
+#define H_DOWNLOAD_CA_FACILITY 0x364
+#define H_CONTROL_CA_FACILITY  0x368
+
+#define H_CONTROL_CA_FUNCTION_RESET                   1 /* perform a reset */
+#define H_CONTROL_CA_FUNCTION_SUSPEND_PROCESS         2 /* suspend a process from being executed */
+#define H_CONTROL_CA_FUNCTION_RESUME_PROCESS          3 /* resume a process to be executed */
+#define H_CONTROL_CA_FUNCTION_READ_ERR_STATE          4 /* read the error state */
+#define H_CONTROL_CA_FUNCTION_GET_AFU_ERR             5 /* collect the AFU error buffer */
+#define H_CONTROL_CA_FUNCTION_GET_CONFIG              6 /* collect configuration record */
+#define H_CONTROL_CA_FUNCTION_GET_DOWNLOAD_STATE      7 /* query to return download status */
+#define H_CONTROL_CA_FUNCTION_TERMINATE_PROCESS       8 /* terminate the process before completion */
+#define H_CONTROL_CA_FUNCTION_COLLECT_VPD             9 /* collect VPD */
+#define H_CONTROL_CA_FUNCTION_GET_FUNCTION_ERR_INT   11 /* read the function-wide error data based on an interrupt */
+#define H_CONTROL_CA_FUNCTION_ACK_FUNCTION_ERR_INT   12 /* acknowledge function-wide error data based on an interrupt */
+#define H_CONTROL_CA_FUNCTION_GET_ERROR_LOG          13 /* retrieve the Platform Log ID (PLID) of an error log */
+
+#define H_CONTROL_CA_FAULTS_RESPOND_PSL         1
+#define H_CONTROL_CA_FAULTS_RESPOND_AFU         2
+
+#define H_CONTROL_CA_FACILITY_RESET             1 /* perform a reset */
+#define H_CONTROL_CA_FACILITY_COLLECT_VPD       2 /* collect VPD */
+
+#define H_DOWNLOAD_CA_FACILITY_DOWNLOAD         1 /* download adapter image */
+#define H_DOWNLOAD_CA_FACILITY_VALIDATE         2 /* validate adapter image */
+
+
+#define _CXL_LOOP_HCALL(call, rc, retbuf, fn, ...)			\
+	{								\
+		unsigned int delay, total_delay = 0;			\
+		u64 token = 0;						\
+									\
+		memset(retbuf, 0, sizeof(retbuf));			\
+		while (1) {						\
+			rc = call(fn, retbuf, __VA_ARGS__, token);	\
+			token = retbuf[0];				\
+			if (rc != H_BUSY && !H_IS_LONG_BUSY(rc))	\
+				break;					\
+									\
+			if (rc == H_BUSY)				\
+				delay = 10;				\
+			else						\
+				delay = get_longbusy_msecs(rc);		\
+									\
+			total_delay += delay;				\
+			if (total_delay > CXL_HCALL_TIMEOUT) {		\
+				WARN(1, "Warning: Giving up waiting for CXL hcall " \
+					"%#x after %u msec\n", fn, total_delay); \
+				rc = H_BUSY;				\
+				break;					\
+			}						\
+			msleep(delay);					\
+		}							\
+	}
+#define CXL_H_WAIT_UNTIL_DONE(...)  _CXL_LOOP_HCALL(plpar_hcall, __VA_ARGS__)
+#define CXL_H9_WAIT_UNTIL_DONE(...) _CXL_LOOP_HCALL(plpar_hcall9, __VA_ARGS__)
+
+#define _PRINT_MSG(rc, format, ...)					\
+	{								\
+		if ((rc != H_SUCCESS) && (rc != H_CONTINUE))		\
+			pr_err(format, __VA_ARGS__);			\
+		else							\
+			pr_devel(format, __VA_ARGS__);			\
+	}								\
+
+
+static char *afu_op_names[] = {
+	"UNKNOWN_OP",		/* 0 undefined */
+	"RESET",		/* 1 */
+	"SUSPEND_PROCESS",	/* 2 */
+	"RESUME_PROCESS",	/* 3 */
+	"READ_ERR_STATE",	/* 4 */
+	"GET_AFU_ERR",		/* 5 */
+	"GET_CONFIG",		/* 6 */
+	"GET_DOWNLOAD_STATE",	/* 7 */
+	"TERMINATE_PROCESS",	/* 8 */
+	"COLLECT_VPD",		/* 9 */
+	"UNKNOWN_OP",		/* 10 undefined */
+	"GET_FUNCTION_ERR_INT",	/* 11 */
+	"ACK_FUNCTION_ERR_INT",	/* 12 */
+	"GET_ERROR_LOG",	/* 13 */
+};
+
+static char *control_adapter_op_names[] = {
+	"UNKNOWN_OP",		/* 0 undefined */
+	"RESET",		/* 1 */
+	"COLLECT_VPD",		/* 2 */
+};
+
+static char *download_op_names[] = {
+	"UNKNOWN_OP",		/* 0 undefined */
+	"DOWNLOAD",		/* 1 */
+	"VALIDATE",		/* 2 */
+};
+
+static char *op_str(unsigned int op, char *name_array[], int array_len)
+{
+	if (op >= array_len)
+		return "UNKNOWN_OP";
+	return name_array[op];
+}
+
+#define OP_STR(op, name_array)      op_str(op, name_array, ARRAY_SIZE(name_array))
+
+#define OP_STR_AFU(op)              OP_STR(op, afu_op_names)
+#define OP_STR_CONTROL_ADAPTER(op)  OP_STR(op, control_adapter_op_names)
+#define OP_STR_DOWNLOAD_ADAPTER(op) OP_STR(op, download_op_names)
+
+
+long cxl_h_attach_process(u64 unit_address,
+			struct cxl_process_element_hcall *element,
+			u64 *process_token, u64 *mmio_addr, u64 *mmio_size)
+{
+	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+	long rc;
+
+	CXL_H_WAIT_UNTIL_DONE(rc, retbuf, H_ATTACH_CA_PROCESS, unit_address, virt_to_phys(element));
+	_PRINT_MSG(rc, "cxl_h_attach_process(%#.16llx, %#.16lx): %li\n",
+		unit_address, virt_to_phys(element), rc);
+
+	pr_devel("token: 0x%.8lx mmio_addr: 0x%lx mmio_size: 0x%lx\nProcess Element Structure:\n",
+		retbuf[0], retbuf[1], retbuf[2]);
+	cxl_dump_debug_buffer(element, sizeof(*element));
+
+	switch (rc) {
+	case H_SUCCESS:       /* The process info is attached to the coherent platform function */
+		*process_token = retbuf[0];
+		if (mmio_addr)
+			*mmio_addr = retbuf[1];
+		if (mmio_size)
+			*mmio_size = retbuf[2];
+		return 0;
+	case H_PARAMETER:     /* An incorrect parameter was supplied. */
+	case H_FUNCTION:      /* The function is not supported. */
+		return -EINVAL;
+	case H_AUTHORITY:     /* The partition does not have authority to perform this hcall */
+	case H_RESOURCE:      /* The coherent platform function does not have enough additional resource to attach the process */
+	case H_HARDWARE:      /* A hardware event prevented the attach operation */
+	case H_STATE:         /* The coherent platform function is not in a valid state */
+	case H_BUSY:
+		return -EBUSY;
+	default:
+		WARN(1, "Unexpected return code: %lx", rc);
+		return -EINVAL;
+	}
+}
+
+/**
+ * cxl_h_detach_process - Detach a process element from a coherent
+ *                        platform function.
+ */
+long cxl_h_detach_process(u64 unit_address, u64 process_token)
+{
+	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+	long rc;
+
+	CXL_H_WAIT_UNTIL_DONE(rc, retbuf, H_DETACH_CA_PROCESS, unit_address, process_token);
+	_PRINT_MSG(rc, "cxl_h_detach_process(%#.16llx, 0x%.8llx): %li\n", unit_address, process_token, rc);
+
+	switch (rc) {
+	case H_SUCCESS:       /* The process was detached from the coherent platform function */
+		return 0;
+	case H_PARAMETER:     /* An incorrect parameter was supplied. */
+		return -EINVAL;
+	case H_AUTHORITY:     /* The partition does not have authority to perform this hcall */
+	case H_RESOURCE:      /* The function has page table mappings for MMIO */
+	case H_HARDWARE:      /* A hardware event prevented the detach operation */
+	case H_STATE:         /* The coherent platform function is not in a valid state */
+	case H_BUSY:
+		return -EBUSY;
+	default:
+		WARN(1, "Unexpected return code: %lx", rc);
+		return -EINVAL;
+	}
+}
+
+/**
+ * cxl_h_control_function - This H_CONTROL_CA_FUNCTION hypervisor call allows
+ *                          the partition to manipulate or query
+ *                          certain coherent platform function behaviors.
+ */
+static long cxl_h_control_function(u64 unit_address, u64 op,
+				   u64 p1, u64 p2, u64 p3, u64 p4, u64 *out)
+{
+	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+	long rc;
+
+	CXL_H9_WAIT_UNTIL_DONE(rc, retbuf, H_CONTROL_CA_FUNCTION, unit_address, op, p1, p2, p3, p4);
+	_PRINT_MSG(rc, "cxl_h_control_function(%#.16llx, %s(%#llx, %#llx, %#llx, %#llx, R4: %#lx)): %li\n",
+		unit_address, OP_STR_AFU(op), p1, p2, p3, p4, retbuf[0], rc);
+
+	switch (rc) {
+	case H_SUCCESS:       /* The operation is completed for the coherent platform function */
+		if ((op == H_CONTROL_CA_FUNCTION_GET_FUNCTION_ERR_INT ||
+		     op == H_CONTROL_CA_FUNCTION_READ_ERR_STATE ||
+		     op == H_CONTROL_CA_FUNCTION_COLLECT_VPD))
+			*out = retbuf[0];
+		return 0;
+	case H_PARAMETER:     /* An incorrect parameter was supplied. */
+	case H_FUNCTION:      /* The function is not supported. */
+	case H_NOT_FOUND:     /* The operation supplied was not valid */
+	case H_NOT_AVAILABLE: /* The operation cannot be performed because the AFU has not been downloaded */
+	case H_SG_LIST:       /* An block list entry was invalid */
+		return -EINVAL;
+	case H_AUTHORITY:     /* The partition does not have authority to perform this hcall */
+	case H_RESOURCE:      /* The function has page table mappings for MMIO */
+	case H_HARDWARE:      /* A hardware event prevented the attach operation */
+	case H_STATE:         /* The coherent platform function is not in a valid state */
+	case H_BUSY:
+		return -EBUSY;
+	default:
+		WARN(1, "Unexpected return code: %lx", rc);
+		return -EINVAL;
+	}
+}
+
+/**
+ * cxl_h_reset_afu - Perform a reset to the coherent platform function.
+ */
+long cxl_h_reset_afu(u64 unit_address)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_RESET,
+				0, 0, 0, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_suspend_process - Suspend a process from being executed
+ * Parameter1 = process-token as returned from H_ATTACH_CA_PROCESS when
+ *              process was attached.
+ */
+long cxl_h_suspend_process(u64 unit_address, u64 process_token)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_SUSPEND_PROCESS,
+				process_token, 0, 0, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_resume_process - Resume a process to be executed
+ * Parameter1 = process-token as returned from H_ATTACH_CA_PROCESS when
+ *              process was attached.
+ */
+long cxl_h_resume_process(u64 unit_address, u64 process_token)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_RESUME_PROCESS,
+				process_token, 0, 0, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_read_error_state - Checks the error state of the coherent
+ *                          platform function.
+ * R4 contains the error state
+ */
+long cxl_h_read_error_state(u64 unit_address, u64 *state)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_READ_ERR_STATE,
+				0, 0, 0, 0,
+				state);
+}
+
+/**
+ * cxl_h_get_afu_err - collect the AFU error buffer
+ * Parameter1 = byte offset into error buffer to retrieve, valid values
+ *              are between 0 and (ibm,error-buffer-size - 1)
+ * Parameter2 = 4K aligned real address of error buffer, to be filled in
+ * Parameter3 = length of error buffer, valid values are 4K or less
+ */
+long cxl_h_get_afu_err(u64 unit_address, u64 offset,
+		u64 buf_address, u64 len)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_GET_AFU_ERR,
+				offset, buf_address, len, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_get_config - collect configuration record for the
+ *                    coherent platform function
+ * Parameter1 = # of configuration record to retrieve, valid values are
+ *              between 0 and (ibm,#config-records - 1)
+ * Parameter2 = byte offset into configuration record to retrieve,
+ *              valid values are between 0 and (ibm,config-record-size - 1)
+ * Parameter3 = 4K aligned real address of configuration record buffer,
+ *              to be filled in
+ * Parameter4 = length of configuration buffer, valid values are 4K or less
+ */
+long cxl_h_get_config(u64 unit_address, u64 cr_num, u64 offset,
+		u64 buf_address, u64 len)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_GET_CONFIG,
+				cr_num, offset, buf_address, len,
+				NULL);
+}
+
+/**
+ * cxl_h_terminate_process - Terminate the process before completion
+ * Parameter1 = process-token as returned from H_ATTACH_CA_PROCESS when
+ *              process was attached.
+ */
+long cxl_h_terminate_process(u64 unit_address, u64 process_token)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_TERMINATE_PROCESS,
+				process_token, 0, 0, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_collect_vpd - Collect VPD for the coherent platform function.
+ * Parameter1 = # of VPD record to retrieve, valid values are between 0
+ *              and (ibm,#config-records - 1).
+ * Parameter2 = 4K naturally aligned real buffer containing block
+ *              list entries
+ * Parameter3 = number of block list entries in the block list, valid
+ *              values are between 0 and 256
+ */
+long cxl_h_collect_vpd(u64 unit_address, u64 record, u64 list_address,
+		       u64 num, u64 *out)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_COLLECT_VPD,
+				record, list_address, num, 0,
+				out);
+}
+
+/**
+ * cxl_h_get_fn_error_interrupt - Read the function-wide error data based on an interrupt
+ */
+long cxl_h_get_fn_error_interrupt(u64 unit_address, u64 *reg)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_GET_FUNCTION_ERR_INT,
+				0, 0, 0, 0, reg);
+}
+
+/**
+ * cxl_h_ack_fn_error_interrupt - Acknowledge function-wide error data
+ *                                based on an interrupt
+ * Parameter1 = value to write to the function-wide error interrupt register
+ */
+long cxl_h_ack_fn_error_interrupt(u64 unit_address, u64 value)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_ACK_FUNCTION_ERR_INT,
+				value, 0, 0, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_get_error_log - Retrieve the Platform Log ID (PLID) of
+ *                       an error log
+ */
+long cxl_h_get_error_log(u64 unit_address, u64 value)
+{
+	return cxl_h_control_function(unit_address,
+				H_CONTROL_CA_FUNCTION_GET_ERROR_LOG,
+				0, 0, 0, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_collect_int_info - Collect interrupt info about a coherent
+ *                          platform function after an interrupt occurred.
+ */
+long cxl_h_collect_int_info(u64 unit_address, u64 process_token,
+			    struct cxl_irq_info *info)
+{
+	long rc;
+
+	BUG_ON(sizeof(*info) != sizeof(unsigned long[PLPAR_HCALL9_BUFSIZE]));
+
+	rc = plpar_hcall9(H_COLLECT_CA_INT_INFO, (unsigned long *) info,
+			unit_address, process_token);
+	_PRINT_MSG(rc, "cxl_h_collect_int_info(%#.16llx, 0x%llx): %li\n",
+		unit_address, process_token, rc);
+
+	switch (rc) {
+	case H_SUCCESS:     /* The interrupt info is returned in return registers. */
+		pr_devel("dsisr:%#llx, dar:%#llx, dsr:%#llx, pid:%u, tid:%u, afu_err:%#llx, errstat:%#llx\n",
+			info->dsisr, info->dar, info->dsr, info->pid,
+			info->tid, info->afu_err, info->errstat);
+		return 0;
+	case H_PARAMETER:   /* An incorrect parameter was supplied. */
+		return -EINVAL;
+	case H_AUTHORITY:   /* The partition does not have authority to perform this hcall. */
+	case H_HARDWARE:    /* A hardware event prevented the collection of the interrupt info.*/
+	case H_STATE:       /* The coherent platform function is not in a valid state to collect interrupt info. */
+		return -EBUSY;
+	default:
+		WARN(1, "Unexpected return code: %lx", rc);
+		return -EINVAL;
+	}
+}
+
+/**
+ * cxl_h_control_faults - Control the operation of a coherent platform
+ *                        function after a fault occurs.
+ *
+ * Parameters
+ *    control-mask: value to control the faults
+ *                  looks like PSL_TFC_An shifted >> 32
+ *    reset-mask: mask to control reset of function faults
+ *                Set reset_mask = 1 to reset PSL errors
+ */
+long cxl_h_control_faults(u64 unit_address, u64 process_token,
+			  u64 control_mask, u64 reset_mask)
+{
+	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+	long rc;
+
+	memset(retbuf, 0, sizeof(retbuf));
+
+	rc = plpar_hcall(H_CONTROL_CA_FAULTS, retbuf, unit_address,
+			H_CONTROL_CA_FAULTS_RESPOND_PSL, process_token,
+			control_mask, reset_mask);
+	_PRINT_MSG(rc, "cxl_h_control_faults(%#.16llx, 0x%llx, %#llx, %#llx): %li (%#lx)\n",
+		unit_address, process_token, control_mask, reset_mask,
+		rc, retbuf[0]);
+
+	switch (rc) {
+	case H_SUCCESS:    /* Faults were successfully controlled for the function. */
+		return 0;
+	case H_PARAMETER:  /* An incorrect parameter was supplied. */
+		return -EINVAL;
+	case H_HARDWARE:   /* A hardware event prevented the control of faults. */
+	case H_STATE:      /* The function was in an invalid state. */
+	case H_AUTHORITY:  /* The partition does not have authority to perform this hcall; the coherent platform facilities may need to be licensed. */
+		return -EBUSY;
+	case H_FUNCTION:   /* The function is not supported */
+	case H_NOT_FOUND:  /* The operation supplied was not valid */
+		return -EINVAL;
+	default:
+		WARN(1, "Unexpected return code: %lx", rc);
+		return -EINVAL;
+	}
+}
+
+/**
+ * cxl_h_control_facility - This H_CONTROL_CA_FACILITY hypervisor call
+ *                          allows the partition to manipulate or query
+ *                          certain coherent platform facility behaviors.
+ */
+static long cxl_h_control_facility(u64 unit_address, u64 op,
+				   u64 p1, u64 p2, u64 p3, u64 p4, u64 *out)
+{
+	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+	long rc;
+
+	CXL_H9_WAIT_UNTIL_DONE(rc, retbuf, H_CONTROL_CA_FACILITY, unit_address, op, p1, p2, p3, p4);
+	_PRINT_MSG(rc, "cxl_h_control_facility(%#.16llx, %s(%#llx, %#llx, %#llx, %#llx, R4: %#lx)): %li\n",
+		unit_address, OP_STR_CONTROL_ADAPTER(op), p1, p2, p3, p4, retbuf[0], rc);
+
+	switch (rc) {
+	case H_SUCCESS:       /* The operation is completed for the coherent platform facility */
+		if (op == H_CONTROL_CA_FACILITY_COLLECT_VPD)
+			*out = retbuf[0];
+		return 0;
+	case H_PARAMETER:     /* An incorrect parameter was supplied. */
+	case H_FUNCTION:      /* The function is not supported. */
+	case H_NOT_FOUND:     /* The operation supplied was not valid */
+	case H_NOT_AVAILABLE: /* The operation cannot be performed because the AFU has not been downloaded */
+	case H_SG_LIST:       /* An block list entry was invalid */
+		return -EINVAL;
+	case H_AUTHORITY:     /* The partition does not have authority to perform this hcall */
+	case H_RESOURCE:      /* The function has page table mappings for MMIO */
+	case H_HARDWARE:      /* A hardware event prevented the attach operation */
+	case H_STATE:         /* The coherent platform facility is not in a valid state */
+	case H_BUSY:
+		return -EBUSY;
+	default:
+		WARN(1, "Unexpected return code: %lx", rc);
+		return -EINVAL;
+	}
+}
+
+/**
+ * cxl_h_reset_adapter - Perform a reset to the coherent platform facility.
+ */
+long cxl_h_reset_adapter(u64 unit_address)
+{
+	return cxl_h_control_facility(unit_address,
+				H_CONTROL_CA_FACILITY_RESET,
+				0, 0, 0, 0,
+				NULL);
+}
+
+/**
+ * cxl_h_collect_vpd - Collect VPD for the coherent platform function.
+ * Parameter1 = 4K naturally aligned real buffer containing block
+ *              list entries
+ * Parameter2 = number of block list entries in the block list, valid
+ *              values are between 0 and 256
+ */
+long cxl_h_collect_vpd_adapter(u64 unit_address, u64 list_address,
+			       u64 num, u64 *out)
+{
+	return cxl_h_control_facility(unit_address,
+				H_CONTROL_CA_FACILITY_COLLECT_VPD,
+				list_address, num, 0, 0,
+				out);
+}
+
+/**
+ * cxl_h_download_facility - This H_DOWNLOAD_CA_FACILITY
+ *                    hypervisor call provide platform support for
+ *                    downloading a base adapter image to the coherent
+ *                    platform facility, and for validating the entire
+ *                    image after the download.
+ * Parameters
+ *    op: operation to perform to the coherent platform function
+ *      Download: operation = 1, the base image in the coherent platform
+ *                               facility is first erased, and then
+ *                               programmed using the image supplied
+ *                               in the scatter/gather list.
+ *      Validate: operation = 2, the base image in the coherent platform
+ *                               facility is compared with the image
+ *                               supplied in the scatter/gather list.
+ *    list_address: 4K naturally aligned real buffer containing
+ *                  scatter/gather list entries.
+ *    num: number of block list entries in the scatter/gather list.
+ */
+static long cxl_h_download_facility(u64 unit_address, u64 op,
+				    u64 list_address, u64 num,
+				    u64 *out)
+{
+	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+	unsigned int delay, total_delay = 0;
+	u64 token = 0;
+	long rc;
+
+	if (*out != 0)
+		token = *out;
+
+	memset(retbuf, 0, sizeof(retbuf));
+	while (1) {
+		rc = plpar_hcall(H_DOWNLOAD_CA_FACILITY, retbuf,
+				 unit_address, op, list_address, num,
+				 token);
+		token = retbuf[0];
+		if (rc != H_BUSY && !H_IS_LONG_BUSY(rc))
+			break;
+
+		if (rc != H_BUSY) {
+			delay = get_longbusy_msecs(rc);
+			total_delay += delay;
+			if (total_delay > CXL_HCALL_TIMEOUT_DOWNLOAD) {
+				WARN(1, "Warning: Giving up waiting for CXL hcall "
+					"%#x after %u msec\n",
+					H_DOWNLOAD_CA_FACILITY, total_delay);
+				rc = H_BUSY;
+				break;
+			}
+			msleep(delay);
+		}
+	}
+	_PRINT_MSG(rc, "cxl_h_download_facility(%#.16llx, %s(%#llx, %#llx), %#lx): %li\n",
+		 unit_address, OP_STR_DOWNLOAD_ADAPTER(op), list_address, num, retbuf[0], rc);
+
+	switch (rc) {
+	case H_SUCCESS:       /* The operation is completed for the coherent platform facility */
+		return 0;
+	case H_PARAMETER:     /* An incorrect parameter was supplied */
+	case H_FUNCTION:      /* The function is not supported. */
+	case H_SG_LIST:       /* An block list entry was invalid */
+	case H_BAD_DATA:      /* Image verification failed */
+		return -EINVAL;
+	case H_AUTHORITY:     /* The partition does not have authority to perform this hcall */
+	case H_RESOURCE:      /* The function has page table mappings for MMIO */
+	case H_HARDWARE:      /* A hardware event prevented the attach operation */
+	case H_STATE:         /* The coherent platform facility is not in a valid state */
+	case H_BUSY:
+		return -EBUSY;
+	case H_CONTINUE:
+		*out = retbuf[0];
+		return 1;  /* More data is needed for the complete image */
+	default:
+		WARN(1, "Unexpected return code: %lx", rc);
+		return -EINVAL;
+	}
+}
+
+/**
+ * cxl_h_download_adapter_image - Download the base image to the coherent
+ *                                platform facility.
+ */
+long cxl_h_download_adapter_image(u64 unit_address,
+				  u64 list_address, u64 num,
+				  u64 *out)
+{
+	return cxl_h_download_facility(unit_address,
+				       H_DOWNLOAD_CA_FACILITY_DOWNLOAD,
+				       list_address, num, out);
+}
+
+/**
+ * cxl_h_validate_adapter_image - Validate the base image in the coherent
+ *                                platform facility.
+ */
+long cxl_h_validate_adapter_image(u64 unit_address,
+				  u64 list_address, u64 num,
+				  u64 *out)
+{
+	return cxl_h_download_facility(unit_address,
+				       H_DOWNLOAD_CA_FACILITY_VALIDATE,
+				       list_address, num, out);
+}

drivers/misc/cxl/hcalls.h

+/*
+ * Copyright 2015 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _HCALLS_H
+#define _HCALLS_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+#include "cxl.h"
+
+#define SG_BUFFER_SIZE 4096
+#define SG_MAX_ENTRIES 256
+
+struct sg_list {
+	u64 phys_addr;
+	u64 len;
+};
+
+/*
+ * This is straight out of PAPR, but replacing some of the compound fields with
+ * a single field, where they were identical to the register layout.
+ *
+ * The 'flags' parameter regroups the various bit-fields
+ */
+#define CXL_PE_CSRP_VALID			(1ULL << 63)
+#define CXL_PE_PROBLEM_STATE			(1ULL << 62)
+#define CXL_PE_SECONDARY_SEGMENT_TBL_SRCH	(1ULL << 61)
+#define CXL_PE_TAGS_ACTIVE			(1ULL << 60)
+#define CXL_PE_USER_STATE			(1ULL << 59)
+#define CXL_PE_TRANSLATION_ENABLED		(1ULL << 58)
+#define CXL_PE_64_BIT				(1ULL << 57)
+#define CXL_PE_PRIVILEGED_PROCESS		(1ULL << 56)
+
+#define CXL_PROCESS_ELEMENT_VERSION 1
+struct cxl_process_element_hcall {
+	__be64 version;
+	__be64 flags;
+	u8     reserved0[12];
+	__be32 pslVirtualIsn;
+	u8     applicationVirtualIsnBitmap[256];
+	u8     reserved1[144];
+	struct cxl_process_element_common common;
+	u8     reserved4[12];
+} __packed;
+
+#define H_STATE_NORMAL              1
+#define H_STATE_DISABLE             2
+#define H_STATE_TEMP_UNAVAILABLE    3
+#define H_STATE_PERM_UNAVAILABLE    4
+
+/* NOTE: element must be a logical real address, and must be pinned */
+long cxl_h_attach_process(u64 unit_address, struct cxl_process_element_hcall *element,
+			u64 *process_token, u64 *mmio_addr, u64 *mmio_size);
+
+/**
+ * cxl_h_detach_process - Detach a process element from a coherent
+ *                        platform function.
+ */
+long cxl_h_detach_process(u64 unit_address, u64 process_token);
+
+/**
+ * cxl_h_reset_afu - Perform a reset to the coherent platform function.
+ */
+long cxl_h_reset_afu(u64 unit_address);
+
+/**
+ * cxl_h_suspend_process - Suspend a process from being executed
+ * Parameter1 = process-token as returned from H_ATTACH_CA_PROCESS when
+ *              process was attached.
+ */
+long cxl_h_suspend_process(u64 unit_address, u64 process_token);
+
+/**
+ * cxl_h_resume_process - Resume a process to be executed
+ * Parameter1 = process-token as returned from H_ATTACH_CA_PROCESS when
+ *              process was attached.
+ */
+long cxl_h_resume_process(u64 unit_address, u64 process_token);
+
+/**
+ * cxl_h_read_error_state - Reads the error state of the coherent
+ *                          platform function.
+ * R4 contains the error state
+ */
+long cxl_h_read_error_state(u64 unit_address, u64 *state);
+
+/**
+ * cxl_h_get_afu_err - collect the AFU error buffer
+ * Parameter1 = byte offset into error buffer to retrieve, valid values
+ *              are between 0 and (ibm,error-buffer-size - 1)
+ * Parameter2 = 4K aligned real address of error buffer, to be filled in
+ * Parameter3 = length of error buffer, valid values are 4K or less
+ */
+long cxl_h_get_afu_err(u64 unit_address, u64 offset, u64 buf_address, u64 len);
+
+/**
+ * cxl_h_get_config - collect configuration record for the
+ *                    coherent platform function
+ * Parameter1 = # of configuration record to retrieve, valid values are
+ *              between 0 and (ibm,#config-records - 1)
+ * Parameter2 = byte offset into configuration record to retrieve,
+ *              valid values are between 0 and (ibm,config-record-size - 1)
+ * Parameter3 = 4K aligned real address of configuration record buffer,
+ *              to be filled in
+ * Parameter4 = length of configuration buffer, valid values are 4K or less
+ */
+long cxl_h_get_config(u64 unit_address, u64 cr_num, u64 offset,
+		u64 buf_address, u64 len);
+
+/**
+ * cxl_h_terminate_process - Terminate the process before completion
+ * Parameter1 = process-token as returned from H_ATTACH_CA_PROCESS when
+ *              process was attached.
+ */
+long cxl_h_terminate_process(u64 unit_address, u64 process_token);
+
+/**
+ * cxl_h_collect_vpd - Collect VPD for the coherent platform function.
+ * Parameter1 = # of VPD record to retrieve, valid values are between 0
+ *              and (ibm,#config-records - 1).
+ * Parameter2 = 4K naturally aligned real buffer containing block
+ *              list entries
+ * Parameter3 = number of block list entries in the block list, valid
+ *              values are between 0 and 256
+ */
+long cxl_h_collect_vpd(u64 unit_address, u64 record, u64 list_address,
+		       u64 num, u64 *out);
+
+/**
+ * cxl_h_get_fn_error_interrupt - Read the function-wide error data based on an interrupt
+ */
+long cxl_h_get_fn_error_interrupt(u64 unit_address, u64 *reg);
+
+/**
+ * cxl_h_ack_fn_error_interrupt - Acknowledge function-wide error data
+ *                                based on an interrupt
+ * Parameter1 = value to write to the function-wide error interrupt register
+ */
+long cxl_h_ack_fn_error_interrupt(u64 unit_address, u64 value);
+
+/**
+ * cxl_h_get_error_log - Retrieve the Platform Log ID (PLID) of
+ *                       an error log
+ */
+long cxl_h_get_error_log(u64 unit_address, u64 value);
+
+/**
+ * cxl_h_collect_int_info - Collect interrupt info about a coherent
+ *                          platform function after an interrupt occurred.
+ */
+long cxl_h_collect_int_info(u64 unit_address, u64 process_token,
+			struct cxl_irq_info *info);
+
+/**
+ * cxl_h_control_faults - Control the operation of a coherent platform
+ *                        function after a fault occurs.
+ *
+ * Parameters
+ *    control-mask: value to control the faults
+ *                  looks like PSL_TFC_An shifted >> 32
+ *    reset-mask: mask to control reset of function faults
+ *                Set reset_mask = 1 to reset PSL errors
+ */
+long cxl_h_control_faults(u64 unit_address, u64 process_token,
+			u64 control_mask, u64 reset_mask);
+
+/**
+ * cxl_h_reset_adapter - Perform a reset to the coherent platform facility.
+ */
+long cxl_h_reset_adapter(u64 unit_address);
+
+/**
+ * cxl_h_collect_vpd - Collect VPD for the coherent platform function.
+ * Parameter1 = 4K naturally aligned real buffer containing block
+ *              list entries
+ * Parameter2 = number of block list entries in the block list, valid
+ *              values are between 0 and 256
+ */
+long cxl_h_collect_vpd_adapter(u64 unit_address, u64 list_address,
+			       u64 num, u64 *out);
+
+/**
+ * cxl_h_download_adapter_image - Download the base image to the coherent
+ *                                platform facility.
+ */
+long cxl_h_download_adapter_image(u64 unit_address,
+				  u64 list_address, u64 num,
+				  u64 *out);
+
+/**
+ * cxl_h_validate_adapter_image - Validate the base image in the coherent
+ *                                platform facility.
+ */
+long cxl_h_validate_adapter_image(u64 unit_address,
+				  u64 list_address, u64 num,
+				  u64 *out);
+#endif /* _HCALLS_H */

drivers/misc/cxl/main.c

@@ -162,6 +162,32 @@ int cxl_alloc_sst(struct cxl_context *ctx)
 	return 0;
 }
 
+/* print buffer content as integers when debugging */
+void cxl_dump_debug_buffer(void *buf, size_t buf_len)
+{
+#ifdef DEBUG
+	int i, *ptr;
+
+	/*
+	 * We want to regroup up to 4 integers per line, which means they
+	 * need to be in the same pr_devel() statement
+	 */
+	ptr = (int *) buf;
+	for (i = 0; i * 4 < buf_len; i += 4) {
+		if ((i + 3) * 4 < buf_len)
+			pr_devel("%.8x %.8x %.8x %.8x\n", ptr[i], ptr[i + 1],
+				ptr[i + 2], ptr[i + 3]);
+		else if ((i + 2) * 4 < buf_len)
+			pr_devel("%.8x %.8x %.8x\n", ptr[i], ptr[i + 1],
+				ptr[i + 2]);
+		else if ((i + 1) * 4 < buf_len)
+			pr_devel("%.8x %.8x\n", ptr[i], ptr[i + 1]);
+		else
+			pr_devel("%.8x\n", ptr[i]);
+	}
+#endif /* DEBUG */
+}
+
 /* Find a CXL adapter by it's number and increase it's refcount */
 struct cxl *get_cxl_adapter(int num)
 {

drivers/misc/cxl/native.c

@@ -726,6 +726,7 @@ static int native_get_irq_info(struct cxl_afu *afu, struct cxl_irq_info *info)
 	info->tid = pidtid & 0xffffffff;
 	info->afu_err = cxl_p2n_read(afu, CXL_AFU_ERR_An);
 	info->errstat = cxl_p2n_read(afu, CXL_PSL_ErrStat_An);
+	info->proc_handle = 0;
 
 	return 0;
 }