fadump: Register for firmware assisted dump.
On 2012-02-20 11:02:51 Mon, Paul Mackerras wrote: > On Thu, Feb 16, 2012 at 04:44:30PM +0530, Mahesh J Salgaonkar wrote: > > If I have read the code correctly, we are going to get this printk on > non-pSeries machines or on older pSeries machines, even if the user > has not put the fadump=on option on the kernel command line. The > printk will be annoying since there is no actual error condition. It > seems to me that the condition for the printk should include > fw_dump.fadump_enabled. In other words you should probably add > > if (!fw_dump.fadump_enabled) > return 0; > > at the beginning of the function. Hi Paul, Thanks for pointing it out. Please find the updated patch below. The existing patches above this (4/10 through 10/10) cleanly applies on this update. Thanks, -Mahesh. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Mahesh Salgaonkar
committed by
Benjamin Herrenschmidt
Benjamin Herrenschmidt
parent
eb39c8803d
commit
3ccc00a7e0
@@ -29,6 +29,9 @@
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#include <linux/string.h>
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#include <linux/memblock.h>
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#include <linux/delay.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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@@ -36,6 +39,10 @@
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#include <asm/fadump.h>
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static struct fw_dump fw_dump;
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static struct fadump_mem_struct fdm;
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static const struct fadump_mem_struct *fdm_active;
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static DEFINE_MUTEX(fadump_mutex);
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/* Scan the Firmware Assisted dump configuration details. */
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int __init early_init_dt_scan_fw_dump(unsigned long node,
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@@ -64,7 +71,8 @@ int __init early_init_dt_scan_fw_dump(unsigned long node,
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* The 'ibm,kernel-dump' rtas node is present only if there is
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* dump data waiting for us.
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*/
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if (of_get_flat_dt_prop(node, "ibm,kernel-dump", NULL))
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fdm_active = of_get_flat_dt_prop(node, "ibm,kernel-dump", NULL);
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if (fdm_active)
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fw_dump.dump_active = 1;
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/* Get the sizes required to store dump data for the firmware provided
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@@ -98,6 +106,85 @@ int __init early_init_dt_scan_fw_dump(unsigned long node,
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return 1;
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}
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int is_fadump_active(void)
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{
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return fw_dump.dump_active;
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}
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/* Print firmware assisted dump configurations for debugging purpose. */
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static void fadump_show_config(void)
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{
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pr_debug("Support for firmware-assisted dump (fadump): %s\n",
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(fw_dump.fadump_supported ? "present" : "no support"));
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if (!fw_dump.fadump_supported)
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return;
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pr_debug("Fadump enabled : %s\n",
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(fw_dump.fadump_enabled ? "yes" : "no"));
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pr_debug("Dump Active : %s\n",
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(fw_dump.dump_active ? "yes" : "no"));
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pr_debug("Dump section sizes:\n");
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pr_debug(" CPU state data size: %lx\n", fw_dump.cpu_state_data_size);
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pr_debug(" HPTE region size : %lx\n", fw_dump.hpte_region_size);
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pr_debug("Boot memory size : %lx\n", fw_dump.boot_memory_size);
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}
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static unsigned long init_fadump_mem_struct(struct fadump_mem_struct *fdm,
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unsigned long addr)
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{
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if (!fdm)
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return 0;
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memset(fdm, 0, sizeof(struct fadump_mem_struct));
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addr = addr & PAGE_MASK;
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fdm->header.dump_format_version = 0x00000001;
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fdm->header.dump_num_sections = 3;
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fdm->header.dump_status_flag = 0;
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fdm->header.offset_first_dump_section =
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(u32)offsetof(struct fadump_mem_struct, cpu_state_data);
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/*
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* Fields for disk dump option.
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* We are not using disk dump option, hence set these fields to 0.
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*/
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fdm->header.dd_block_size = 0;
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fdm->header.dd_block_offset = 0;
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fdm->header.dd_num_blocks = 0;
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fdm->header.dd_offset_disk_path = 0;
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/* set 0 to disable an automatic dump-reboot. */
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fdm->header.max_time_auto = 0;
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/* Kernel dump sections */
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/* cpu state data section. */
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fdm->cpu_state_data.request_flag = FADUMP_REQUEST_FLAG;
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fdm->cpu_state_data.source_data_type = FADUMP_CPU_STATE_DATA;
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fdm->cpu_state_data.source_address = 0;
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fdm->cpu_state_data.source_len = fw_dump.cpu_state_data_size;
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fdm->cpu_state_data.destination_address = addr;
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addr += fw_dump.cpu_state_data_size;
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/* hpte region section */
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fdm->hpte_region.request_flag = FADUMP_REQUEST_FLAG;
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fdm->hpte_region.source_data_type = FADUMP_HPTE_REGION;
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fdm->hpte_region.source_address = 0;
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fdm->hpte_region.source_len = fw_dump.hpte_region_size;
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fdm->hpte_region.destination_address = addr;
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addr += fw_dump.hpte_region_size;
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/* RMA region section */
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fdm->rmr_region.request_flag = FADUMP_REQUEST_FLAG;
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fdm->rmr_region.source_data_type = FADUMP_REAL_MODE_REGION;
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fdm->rmr_region.source_address = RMA_START;
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fdm->rmr_region.source_len = fw_dump.boot_memory_size;
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fdm->rmr_region.destination_address = addr;
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addr += fw_dump.boot_memory_size;
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return addr;
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}
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/**
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* fadump_calculate_reserve_size(): reserve variable boot area 5% of System RAM
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*
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@@ -166,8 +253,15 @@ int __init fadump_reserve_mem(void)
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fw_dump.fadump_enabled = 0;
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return 0;
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}
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/* Initialize boot memory size */
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fw_dump.boot_memory_size = fadump_calculate_reserve_size();
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/*
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* Initialize boot memory size
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* If dump is active then we have already calculated the size during
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* first kernel.
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*/
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if (fdm_active)
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fw_dump.boot_memory_size = fdm_active->rmr_region.source_len;
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else
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fw_dump.boot_memory_size = fadump_calculate_reserve_size();
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/*
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* Calculate the memory boundary.
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@@ -244,3 +338,258 @@ static int __init early_fadump_reserve_mem(char *p)
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return 0;
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}
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early_param("fadump_reserve_mem", early_fadump_reserve_mem);
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static void register_fw_dump(struct fadump_mem_struct *fdm)
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{
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int rc;
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unsigned int wait_time;
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pr_debug("Registering for firmware-assisted kernel dump...\n");
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/* TODO: Add upper time limit for the delay */
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do {
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rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
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FADUMP_REGISTER, fdm,
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sizeof(struct fadump_mem_struct));
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wait_time = rtas_busy_delay_time(rc);
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if (wait_time)
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mdelay(wait_time);
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} while (wait_time);
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switch (rc) {
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case -1:
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printk(KERN_ERR "Failed to register firmware-assisted kernel"
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" dump. Hardware Error(%d).\n", rc);
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break;
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case -3:
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printk(KERN_ERR "Failed to register firmware-assisted kernel"
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" dump. Parameter Error(%d).\n", rc);
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break;
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case -9:
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printk(KERN_ERR "firmware-assisted kernel dump is already "
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" registered.");
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fw_dump.dump_registered = 1;
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break;
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case 0:
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printk(KERN_INFO "firmware-assisted kernel dump registration"
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" is successful\n");
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fw_dump.dump_registered = 1;
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break;
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}
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}
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static void register_fadump(void)
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{
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/*
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* If no memory is reserved then we can not register for firmware-
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* assisted dump.
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*/
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if (!fw_dump.reserve_dump_area_size)
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return;
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/* register the future kernel dump with firmware. */
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register_fw_dump(&fdm);
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}
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static int fadump_unregister_dump(struct fadump_mem_struct *fdm)
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{
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int rc = 0;
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unsigned int wait_time;
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pr_debug("Un-register firmware-assisted dump\n");
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/* TODO: Add upper time limit for the delay */
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do {
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rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
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FADUMP_UNREGISTER, fdm,
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sizeof(struct fadump_mem_struct));
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wait_time = rtas_busy_delay_time(rc);
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if (wait_time)
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mdelay(wait_time);
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} while (wait_time);
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if (rc) {
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printk(KERN_ERR "Failed to un-register firmware-assisted dump."
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" unexpected error(%d).\n", rc);
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return rc;
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}
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fw_dump.dump_registered = 0;
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return 0;
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}
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static ssize_t fadump_enabled_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%d\n", fw_dump.fadump_enabled);
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}
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static ssize_t fadump_register_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%d\n", fw_dump.dump_registered);
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}
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static ssize_t fadump_register_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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int ret = 0;
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if (!fw_dump.fadump_enabled || fdm_active)
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return -EPERM;
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mutex_lock(&fadump_mutex);
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switch (buf[0]) {
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case '0':
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if (fw_dump.dump_registered == 0) {
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ret = -EINVAL;
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goto unlock_out;
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}
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/* Un-register Firmware-assisted dump */
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fadump_unregister_dump(&fdm);
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break;
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case '1':
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if (fw_dump.dump_registered == 1) {
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ret = -EINVAL;
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goto unlock_out;
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}
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/* Register Firmware-assisted dump */
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register_fadump();
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break;
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default:
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ret = -EINVAL;
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break;
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}
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unlock_out:
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mutex_unlock(&fadump_mutex);
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return ret < 0 ? ret : count;
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}
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static int fadump_region_show(struct seq_file *m, void *private)
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{
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const struct fadump_mem_struct *fdm_ptr;
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if (!fw_dump.fadump_enabled)
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return 0;
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if (fdm_active)
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fdm_ptr = fdm_active;
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else
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fdm_ptr = &fdm;
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seq_printf(m,
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"CPU : [%#016llx-%#016llx] %#llx bytes, "
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"Dumped: %#llx\n",
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fdm_ptr->cpu_state_data.destination_address,
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fdm_ptr->cpu_state_data.destination_address +
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fdm_ptr->cpu_state_data.source_len - 1,
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fdm_ptr->cpu_state_data.source_len,
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fdm_ptr->cpu_state_data.bytes_dumped);
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seq_printf(m,
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"HPTE: [%#016llx-%#016llx] %#llx bytes, "
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"Dumped: %#llx\n",
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fdm_ptr->hpte_region.destination_address,
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fdm_ptr->hpte_region.destination_address +
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fdm_ptr->hpte_region.source_len - 1,
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fdm_ptr->hpte_region.source_len,
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fdm_ptr->hpte_region.bytes_dumped);
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seq_printf(m,
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"DUMP: [%#016llx-%#016llx] %#llx bytes, "
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"Dumped: %#llx\n",
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fdm_ptr->rmr_region.destination_address,
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fdm_ptr->rmr_region.destination_address +
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fdm_ptr->rmr_region.source_len - 1,
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fdm_ptr->rmr_region.source_len,
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fdm_ptr->rmr_region.bytes_dumped);
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if (!fdm_active ||
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(fw_dump.reserve_dump_area_start ==
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fdm_ptr->cpu_state_data.destination_address))
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return 0;
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/* Dump is active. Show reserved memory region. */
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seq_printf(m,
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" : [%#016llx-%#016llx] %#llx bytes, "
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"Dumped: %#llx\n",
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(unsigned long long)fw_dump.reserve_dump_area_start,
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fdm_ptr->cpu_state_data.destination_address - 1,
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fdm_ptr->cpu_state_data.destination_address -
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fw_dump.reserve_dump_area_start,
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fdm_ptr->cpu_state_data.destination_address -
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fw_dump.reserve_dump_area_start);
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return 0;
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}
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static struct kobj_attribute fadump_attr = __ATTR(fadump_enabled,
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0444, fadump_enabled_show,
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NULL);
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static struct kobj_attribute fadump_register_attr = __ATTR(fadump_registered,
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0644, fadump_register_show,
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fadump_register_store);
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static int fadump_region_open(struct inode *inode, struct file *file)
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{
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return single_open(file, fadump_region_show, inode->i_private);
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}
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static const struct file_operations fadump_region_fops = {
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.open = fadump_region_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void fadump_init_files(void)
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{
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struct dentry *debugfs_file;
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int rc = 0;
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rc = sysfs_create_file(kernel_kobj, &fadump_attr.attr);
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if (rc)
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printk(KERN_ERR "fadump: unable to create sysfs file"
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" fadump_enabled (%d)\n", rc);
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rc = sysfs_create_file(kernel_kobj, &fadump_register_attr.attr);
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if (rc)
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printk(KERN_ERR "fadump: unable to create sysfs file"
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" fadump_registered (%d)\n", rc);
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debugfs_file = debugfs_create_file("fadump_region", 0444,
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powerpc_debugfs_root, NULL,
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&fadump_region_fops);
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if (!debugfs_file)
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printk(KERN_ERR "fadump: unable to create debugfs file"
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" fadump_region\n");
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return;
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}
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/*
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* Prepare for firmware-assisted dump.
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*/
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int __init setup_fadump(void)
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{
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if (!fw_dump.fadump_enabled)
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return 0;
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if (!fw_dump.fadump_supported) {
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printk(KERN_ERR "Firmware-assisted dump is not supported on"
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" this hardware\n");
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return 0;
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}
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fadump_show_config();
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/* Initialize the kernel dump memory structure for FAD registration. */
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if (fw_dump.reserve_dump_area_size)
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init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start);
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fadump_init_files();
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return 1;
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}
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subsys_initcall(setup_fadump);
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@@ -39,6 +39,7 @@
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#include <asm/pci-bridge.h>
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#include <asm/machdep.h>
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#include <asm/kdump.h>
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#include <asm/fadump.h>
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#define DBG(...)
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@@ -445,7 +446,12 @@ void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
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static void iommu_table_clear(struct iommu_table *tbl)
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{
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if (!is_kdump_kernel()) {
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/*
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* In case of firmware assisted dump system goes through clean
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* reboot process at the time of system crash. Hence it's safe to
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* clear the TCE entries if firmware assisted dump is active.
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*/
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if (!is_kdump_kernel() || is_fadump_active()) {
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/* Clear the table in case firmware left allocations in it */
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ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
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return;
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