[deliverable/linux.git] / drivers / acpi / acpi_extlog.c

/*
 * Extended Error Log driver
 *
 * Copyright (C) 2013 Intel Corp.
 * Author: Chen, Gong <gong.chen@intel.com>
 *
 * This file is licensed under GPLv2.
 */

#include <linux/module.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/cper.h>
#include <linux/ratelimit.h>
#include <asm/cpu.h>
#include <asm/mce.h>

#include "apei/apei-internal.h"

#define EXT_ELOG_ENTRY_MASK	GENMASK_ULL(51, 0) /* elog entry address mask */

#define EXTLOG_DSM_REV		0x0
#define	EXTLOG_FN_QUERY		0x0
#define	EXTLOG_FN_ADDR		0x1

#define FLAG_OS_OPTIN		BIT(0)
#define EXTLOG_QUERY_L1_EXIST	BIT(1)
#define ELOG_ENTRY_VALID	(1ULL<<63)
#define ELOG_ENTRY_LEN		0x1000

#define EMCA_BUG \
	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"

struct extlog_l1_head {
	u32 ver;	/* Header Version */
	u32 hdr_len;	/* Header Length */
	u64 total_len;	/* entire L1 Directory length including this header */
	u64 elog_base;	/* MCA Error Log Directory base address */
	u64 elog_len;	/* MCA Error Log Directory length */
	u32 flags;	/* bit 0 - OS/VMM Opt-in */
	u8  rev0[12];
	u32 entries;	/* Valid L1 Directory entries per logical processor */
	u8  rev1[12];
};

static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";

/* L1 table related physical address */
static u64 elog_base;
static size_t elog_size;
static u64 l1_dirbase;
static size_t l1_size;

/* L1 table related virtual address */
static void __iomem *extlog_l1_addr;
static void __iomem *elog_addr;

static void *elog_buf;

static u64 *l1_entry_base;
static u32 l1_percpu_entry;

#define ELOG_IDX(cpu, bank) \
	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))

#define ELOG_ENTRY_DATA(idx) \
	(*(l1_entry_base + (idx)))

#define ELOG_ENTRY_ADDR(phyaddr) \
	(phyaddr - elog_base + (u8 *)elog_addr)

static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank)
{
	int idx;
	u64 data;
	struct acpi_generic_status *estatus;

	WARN_ON(cpu < 0);
	idx = ELOG_IDX(cpu, bank);
	data = ELOG_ENTRY_DATA(idx);
	if ((data & ELOG_ENTRY_VALID) == 0)
		return NULL;

	data &= EXT_ELOG_ENTRY_MASK;
	estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data);

	/* if no valid data in elog entry, just return */
	if (estatus->block_status == 0)
		return NULL;

	return estatus;
}

static void __print_extlog_rcd(const char *pfx,
			       struct acpi_generic_status *estatus, int cpu)
{
	static atomic_t seqno;
	unsigned int curr_seqno;
	char pfx_seq[64];

	if (!pfx) {
		if (estatus->error_severity <= CPER_SEV_CORRECTED)
			pfx = KERN_INFO;
		else
			pfx = KERN_ERR;
	}
	curr_seqno = atomic_inc_return(&seqno);
	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
	cper_estatus_print(pfx_seq, estatus);
}

static int print_extlog_rcd(const char *pfx,
			    struct acpi_generic_status *estatus, int cpu)
{
	/* Not more than 2 messages every 5 seconds */
	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
	struct ratelimit_state *ratelimit;

	if (estatus->error_severity == CPER_SEV_CORRECTED ||
	    (estatus->error_severity == CPER_SEV_INFORMATIONAL))
		ratelimit = &ratelimit_corrected;
	else
		ratelimit = &ratelimit_uncorrected;
	if (__ratelimit(ratelimit)) {
		__print_extlog_rcd(pfx, estatus, cpu);
		return 0;
	}

	return 1;
}

static int extlog_print(struct notifier_block *nb, unsigned long val,
			void *data)
{
	struct mce *mce = (struct mce *)data;
	int	bank = mce->bank;
	int	cpu = mce->extcpu;
	struct acpi_generic_status *estatus;
	int rc;

	estatus = extlog_elog_entry_check(cpu, bank);
	if (estatus == NULL)
		return NOTIFY_DONE;

	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
	/* clear record status to enable BIOS to update it again */
	estatus->block_status = 0;

	rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);

	return NOTIFY_DONE;
}

static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
{
	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
	struct acpi_object_list input;
	union acpi_object params[4], *obj;
	u8 uuid[16];
	int i;

	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = 16;
	params[0].buffer.pointer = uuid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = rev;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_PACKAGE;
	params[3].package.count = 0;
	params[3].package.elements = NULL;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
		return -1;

	*ret = 0;
	obj = (union acpi_object *)buf.pointer;
	if (obj->type == ACPI_TYPE_INTEGER) {
		*ret = obj->integer.value;
	} else if (obj->type == ACPI_TYPE_BUFFER) {
		if (obj->buffer.length <= 8) {
			for (i = 0; i < obj->buffer.length; i++)
				*ret |= (obj->buffer.pointer[i] << (i * 8));
		}
	}
	kfree(buf.pointer);

	return 0;
}

static bool extlog_get_l1addr(void)
{
	acpi_handle handle;
	u64 ret;

	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
		return false;

	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) ||
	    !(ret & EXTLOG_QUERY_L1_EXIST))
		return false;

	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
		return false;

	l1_dirbase = ret;
	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
	if (l1_dirbase & ((1 << 12) - 1)) {
		pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
			l1_dirbase);
		return false;
	}

	return true;
}
static struct notifier_block extlog_mce_dec = {
	.notifier_call	= extlog_print,
};

static int __init extlog_init(void)
{
	struct extlog_l1_head *l1_head;
	void __iomem *extlog_l1_hdr;
	size_t l1_hdr_size;
	struct resource *r;
	u64 cap;
	int rc;

	rc = -ENODEV;

	rdmsrl(MSR_IA32_MCG_CAP, cap);
	if (!(cap & MCG_ELOG_P))
		return rc;

	if (!extlog_get_l1addr())
		return rc;

	rc = -EINVAL;
	/* get L1 header to fetch necessary information */
	l1_hdr_size = sizeof(struct extlog_l1_head);
	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
	if (!r) {
		pr_warn(FW_BUG EMCA_BUG,
			(unsigned long long)l1_dirbase,
			(unsigned long long)l1_dirbase + l1_hdr_size);
		goto err;
	}

	extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size);
	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
	l1_size = l1_head->total_len;
	l1_percpu_entry = l1_head->entries;
	elog_base = l1_head->elog_base;
	elog_size = l1_head->elog_len;
	acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size);
	release_mem_region(l1_dirbase, l1_hdr_size);

	/* remap L1 header again based on completed information */
	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
	if (!r) {
		pr_warn(FW_BUG EMCA_BUG,
			(unsigned long long)l1_dirbase,
			(unsigned long long)l1_dirbase + l1_size);
		goto err;
	}
	extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size);
	l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size);

	/* remap elog table */
	r = request_mem_region(elog_base, elog_size, "Elog Table");
	if (!r) {
		pr_warn(FW_BUG EMCA_BUG,
			(unsigned long long)elog_base,
			(unsigned long long)elog_base + elog_size);
		goto err_release_l1_dir;
	}
	elog_addr = acpi_os_map_memory(elog_base, elog_size);

	rc = -ENOMEM;
	/* allocate buffer to save elog record */
	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
	if (elog_buf == NULL)
		goto err_release_elog;

	mce_register_decode_chain(&extlog_mce_dec);
	/* enable OS to be involved to take over management from BIOS */
	((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;

	return 0;

err_release_elog:
	if (elog_addr)
		acpi_os_unmap_memory(elog_addr, elog_size);
	release_mem_region(elog_base, elog_size);
err_release_l1_dir:
	if (extlog_l1_addr)
		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
	release_mem_region(l1_dirbase, l1_size);
err:
	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
	return rc;
}

static void __exit extlog_exit(void)
{
	mce_unregister_decode_chain(&extlog_mce_dec);
	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
	if (extlog_l1_addr)
		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
	if (elog_addr)
		acpi_os_unmap_memory(elog_addr, elog_size);
	release_mem_region(elog_base, elog_size);
	release_mem_region(l1_dirbase, l1_size);
	kfree(elog_buf);
}

module_init(extlog_init);
module_exit(extlog_exit);

MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
MODULE_DESCRIPTION("Extended MCA Error Log Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
4b3db708 CG	1	/*
	2	* Extended Error Log driver
	3	*
	4	* Copyright (C) 2013 Intel Corp.
	5	* Author: Chen, Gong <gong.chen@intel.com>
	6	*
	7	* This file is licensed under GPLv2.
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/acpi.h>
	12	#include <acpi/acpi_bus.h>
	13	#include <linux/cper.h>
	14	#include <linux/ratelimit.h>
	15	#include <asm/cpu.h>
	16	#include <asm/mce.h>
	17
	18	#include "apei/apei-internal.h"
	19
	20	#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */
	21
	22	#define EXTLOG_DSM_REV 0x0
	23	#define EXTLOG_FN_QUERY 0x0
	24	#define EXTLOG_FN_ADDR 0x1
	25
	26	#define FLAG_OS_OPTIN BIT(0)
	27	#define EXTLOG_QUERY_L1_EXIST BIT(1)
	28	#define ELOG_ENTRY_VALID (1ULL<<63)
	29	#define ELOG_ENTRY_LEN 0x1000
	30
	31	#define EMCA_BUG \
	32	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
	33
	34	struct extlog_l1_head {
	35	u32 ver; /* Header Version */
	36	u32 hdr_len; /* Header Length */
	37	u64 total_len; /* entire L1 Directory length including this header */
	38	u64 elog_base; /* MCA Error Log Directory base address */
	39	u64 elog_len; /* MCA Error Log Directory length */
	40	u32 flags; /* bit 0 - OS/VMM Opt-in */
	41	u8 rev0[12];
	42	u32 entries; /* Valid L1 Directory entries per logical processor */
	43	u8 rev1[12];
	44	};
	45
	46	static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
	47
	48	/* L1 table related physical address */
	49	static u64 elog_base;
	50	static size_t elog_size;
	51	static u64 l1_dirbase;
	52	static size_t l1_size;
	53
	54	/* L1 table related virtual address */
	55	static void __iomem *extlog_l1_addr;
	56	static void __iomem *elog_addr;
	57
	58	static void *elog_buf;
	59
	60	static u64 *l1_entry_base;
	61	static u32 l1_percpu_entry;
	62
	63	#define ELOG_IDX(cpu, bank) \
	64	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
65
66	#define ELOG_ENTRY_DATA(idx) \
67	(*(l1_entry_base + (idx)))
68
69	#define ELOG_ENTRY_ADDR(phyaddr) \
70	(phyaddr - elog_base + (u8 *)elog_addr)
71
72	static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank)
73	{
74	int idx;
75	u64 data;
76	struct acpi_generic_status *estatus;
77
78	WARN_ON(cpu < 0);
79	idx = ELOG_IDX(cpu, bank);
80	data = ELOG_ENTRY_DATA(idx);
81	if ((data & ELOG_ENTRY_VALID) == 0)
82	return NULL;
83
84	data &= EXT_ELOG_ENTRY_MASK;
85	estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data);
86
87	/* if no valid data in elog entry, just return */
88	if (estatus->block_status == 0)
89	return NULL;
90
91	return estatus;
92	}
93
94	static void __print_extlog_rcd(const char *pfx,
95	struct acpi_generic_status *estatus, int cpu)
96	{
97	static atomic_t seqno;
98	unsigned int curr_seqno;
99	char pfx_seq[64];
100
101	if (!pfx) {
102	if (estatus->error_severity <= CPER_SEV_CORRECTED)
103	pfx = KERN_INFO;
104	else
105	pfx = KERN_ERR;
106	}
107	curr_seqno = atomic_inc_return(&seqno);
108	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
109	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
110	cper_estatus_print(pfx_seq, estatus);
111	}
112
113	static int print_extlog_rcd(const char *pfx,
114	struct acpi_generic_status *estatus, int cpu)
115	{
116	/* Not more than 2 messages every 5 seconds */
117	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
118	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
119	struct ratelimit_state *ratelimit;
120
121	if (estatus->error_severity == CPER_SEV_CORRECTED \|\|
122	(estatus->error_severity == CPER_SEV_INFORMATIONAL))
123	ratelimit = &ratelimit_corrected;
124	else
125	ratelimit = &ratelimit_uncorrected;
126	if (__ratelimit(ratelimit)) {
127	__print_extlog_rcd(pfx, estatus, cpu);
128	return 0;
129	}
130
131	return 1;
132	}
133
134	static int extlog_print(struct notifier_block *nb, unsigned long val,
135	void *data)
136	{
137	struct mce mce = (struct mce )data;
138	int bank = mce->bank;
139	int cpu = mce->extcpu;
140	struct acpi_generic_status *estatus;
141	int rc;
142
143	estatus = extlog_elog_entry_check(cpu, bank);
144	if (estatus == NULL)
145	return NOTIFY_DONE;
146
147	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
148	/* clear record status to enable BIOS to update it again */
149	estatus->block_status = 0;
150
151	rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);
152
153	return NOTIFY_DONE;
154	}
155
156	static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
157	{
158	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
159	struct acpi_object_list input;
160	union acpi_object params[4], *obj;
161	u8 uuid[16];
162	int i;
163
164	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
165	input.count = 4;
166	input.pointer = params;
167	params[0].type = ACPI_TYPE_BUFFER;
168	params[0].buffer.length = 16;
169	params[0].buffer.pointer = uuid;
170	params[1].type = ACPI_TYPE_INTEGER;
171	params[1].integer.value = rev;
172	params[2].type = ACPI_TYPE_INTEGER;
173	params[2].integer.value = func;
174	params[3].type = ACPI_TYPE_PACKAGE;
175	params[3].package.count = 0;
176	params[3].package.elements = NULL;
177
178	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
179	return -1;
180
181	*ret = 0;
182	obj = (union acpi_object *)buf.pointer;
183	if (obj->type == ACPI_TYPE_INTEGER) {
184	*ret = obj->integer.value;
185	} else if (obj->type == ACPI_TYPE_BUFFER) {
186	if (obj->buffer.length <= 8) {
187	for (i = 0; i < obj->buffer.length; i++)
188	ret \|= (obj->buffer.pointer[i] << (i 8));
189	}
190	}
191	kfree(buf.pointer);
192
193	return 0;
194	}
195
196	static bool extlog_get_l1addr(void)
197	{
198	acpi_handle handle;
199	u64 ret;
200
201	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
202	return false;
203
204	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) \|\|
205	!(ret & EXTLOG_QUERY_L1_EXIST))
206	return false;
207
208	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
209	return false;
210
211	l1_dirbase = ret;
212	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
213	if (l1_dirbase & ((1 << 12) - 1)) {
214	pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
215	l1_dirbase);
216	return false;
217	}
218
219	return true;
220	}
221	static struct notifier_block extlog_mce_dec = {
222	.notifier_call = extlog_print,
223	};
224
225	static int __init extlog_init(void)
226	{
227	struct extlog_l1_head *l1_head;
228	void __iomem *extlog_l1_hdr;
229	size_t l1_hdr_size;
230	struct resource *r;
231	u64 cap;
232	int rc;
233
234	rc = -ENODEV;
235
236	rdmsrl(MSR_IA32_MCG_CAP, cap);
237	if (!(cap & MCG_ELOG_P))
238	return rc;
239
240	if (!extlog_get_l1addr())
241	return rc;
242
243	rc = -EINVAL;
244	/* get L1 header to fetch necessary information */
245	l1_hdr_size = sizeof(struct extlog_l1_head);
246	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
247	if (!r) {
248	pr_warn(FW_BUG EMCA_BUG,
249	(unsigned long long)l1_dirbase,
250	(unsigned long long)l1_dirbase + l1_hdr_size);
251	goto err;
252	}
253
254	extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size);
255	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
256	l1_size = l1_head->total_len;
257	l1_percpu_entry = l1_head->entries;
258	elog_base = l1_head->elog_base;
259	elog_size = l1_head->elog_len;
260	acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size);
261	release_mem_region(l1_dirbase, l1_hdr_size);
262
263	/* remap L1 header again based on completed information */
264	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
265	if (!r) {
266	pr_warn(FW_BUG EMCA_BUG,
267	(unsigned long long)l1_dirbase,
268	(unsigned long long)l1_dirbase + l1_size);
269	goto err;
270	}
271	extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size);
272	l1_entry_base = (u64 )((u8 )extlog_l1_addr + l1_hdr_size);
273
274	/* remap elog table */
275	r = request_mem_region(elog_base, elog_size, "Elog Table");
276	if (!r) {
277	pr_warn(FW_BUG EMCA_BUG,
278	(unsigned long long)elog_base,
279	(unsigned long long)elog_base + elog_size);
280	goto err_release_l1_dir;
281	}
282	elog_addr = acpi_os_map_memory(elog_base, elog_size);
283
284	rc = -ENOMEM;
285	/* allocate buffer to save elog record */
286	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
287	if (elog_buf == NULL)
288	goto err_release_elog;
289
290	mce_register_decode_chain(&extlog_mce_dec);
291	/* enable OS to be involved to take over management from BIOS */
292	((struct extlog_l1_head *)extlog_l1_addr)->flags \|= FLAG_OS_OPTIN;
293
294	return 0;
295
296	err_release_elog:
297	if (elog_addr)
298	acpi_os_unmap_memory(elog_addr, elog_size);
299	release_mem_region(elog_base, elog_size);
300	err_release_l1_dir:
301	if (extlog_l1_addr)
302	acpi_os_unmap_memory(extlog_l1_addr, l1_size);
303	release_mem_region(l1_dirbase, l1_size);
304	err:
305	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
306	return rc;
307	}
308
309	static void __exit extlog_exit(void)
310	{
311	mce_unregister_decode_chain(&extlog_mce_dec);
312	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
313	if (extlog_l1_addr)
314	acpi_os_unmap_memory(extlog_l1_addr, l1_size);
315	if (elog_addr)
316	acpi_os_unmap_memory(elog_addr, elog_size);
317	release_mem_region(elog_base, elog_size);
318	release_mem_region(l1_dirbase, l1_size);
319	kfree(elog_buf);
320	}
321
322	module_init(extlog_init);
323	module_exit(extlog_exit);
324
325	MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
326	MODULE_DESCRIPTION("Extended MCA Error Log Driver");
327	MODULE_LICENSE("GPL");