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pil: Fix minidump collection during SSR

Browse source 
By default, the ramdump driver expects the virtual address of the
segments to be set in order to collect the dumps. However, the
minidump collection path in the PIL driver doesn't honor this
requirement. Hence, generate a mapping on the physical address
and use that to collect the minidumps.

Change-Id: Icb7b20dc5f31daab6d1f1be5b7046e4c18dea31a
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>
This commit is contained in:
Raghavendra Rao Ananta 2020-06-23 15:19:56 -07:00
commit a0a9abc9fc
3 changed files with 41 additions and 8 deletions
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45
drivers/soc/qcom/peripheral-loader.c
View file

@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2010-2019, The Linux Foundation. All rights reserved.
* Copyright (c) 2010-2020, The Linux Foundation. All rights reserved.
*/
#include <linux/module.h>
@ -237,6 +237,22 @@ static void unmap_aux_minidump_regions(struct aux_minidump_info *aux_mdump,
}
}
/**
* unmap_minidump_segments() - unmap the individual segments that were mapped
* @rd_segs: The array of ramdump segments
* @num_valid_segs: The number of valid segments from rd_segs
*
* The function unmaps the valid regions for the segments that were mapped.
*/
static void unmap_minidump_segments(struct ramdump_segment *rd_segs,
int num_valid_segs)
{
while (num_valid_segs--) {
iounmap(rd_segs->v_address);
rd_segs++;
}
}
/**
* prepare_minidump_segments() - Fills in the necessary information for the
* ramdump driver to dump a region of memory, described by a segment.
@ -271,6 +287,12 @@ static unsigned int prepare_minidump_segments(struct ramdump_segment *rd_segs,
offset = offset +
sizeof(region_info->region_base_address);
rd_segs->size = __raw_readl(offset);
rd_segs->v_address = ioremap_wc(rd_segs->address,
rd_segs->size);
if (!rd_segs->v_address)
return -ENOMEM;
pr_debug("Minidump : Dumping segment %s with address 0x%lx and size 0x%x\n",
rd_segs->name, rd_segs->address,
(unsigned int)rd_segs->size);
@ -301,14 +323,14 @@ static unsigned int prepare_minidump_segments(struct ramdump_segment *rd_segs,
* describe the regions that should be dumped by the ramdump driver for a set
* of auxiliary minidump IDs.
*/
static void prepare_aux_minidump_segments(struct ramdump_segment *rd_segs,
static int prepare_aux_minidump_segments(struct ramdump_segment *rd_segs,
struct aux_minidump_info *aux_mdump,
int *ss_valid_seg_cnt,
int num_aux_md_ids)
{
unsigned int i;
struct ramdump_segment *s = rd_segs;
unsigned int next_offset = 0;
int next_offset = 0;
for (i = 0; i < num_aux_md_ids; i++) {
s = &rd_segs[next_offset];
@ -316,7 +338,11 @@ static void prepare_aux_minidump_segments(struct ramdump_segment *rd_segs,
aux_mdump[i].region_info_aux,
aux_mdump[i].seg_cnt,
ss_valid_seg_cnt);
if (next_offset < 0)
return next_offset;
}
return 0;
}
static int pil_do_minidump(struct pil_desc *desc, void *ramdump_dev)
@ -329,7 +355,7 @@ static int pil_do_minidump(struct pil_desc *desc, void *ramdump_dev)
int ss_valid_seg_cnt;
int ret;
struct aux_minidump_info *aux_minidump_data = NULL;
unsigned int next_offset;
int next_offset;
if (!ramdump_dev)
return -ENODEV;
@ -372,12 +398,17 @@ static int pil_do_minidump(struct pil_desc *desc, void *ramdump_dev)
next_offset = prepare_minidump_segments(ramdump_segs, region_info_ss,
ss_mdump_seg_cnt_ss,
&ss_valid_seg_cnt);
if (next_offset < 0)
goto seg_mapping_fail;
if (desc->num_aux_minidump_ids > 0)
prepare_aux_minidump_segments(&ramdump_segs[next_offset],
if (desc->num_aux_minidump_ids > 0) {
ret = prepare_aux_minidump_segments(&ramdump_segs[next_offset],
aux_minidump_data,
&ss_valid_seg_cnt,
desc->num_aux_minidump_ids);
if (ret < 0)
goto seg_mapping_fail;
}
ret = do_minidump(ramdump_dev, ramdump_segs, ss_valid_seg_cnt);
if (ret)
@ -388,6 +419,8 @@ static int pil_do_minidump(struct pil_desc *desc, void *ramdump_dev)
ret = pil_assign_mem_to_subsys(desc, priv->region_start,
(priv->region_end - priv->region_start));
seg_mapping_fail:
unmap_minidump_segments(ramdump_segs, ss_valid_seg_cnt);
kfree(ramdump_segs);
mapping_fail:
unmap_aux_minidump_regions(aux_minidump_data,

2
drivers/soc/qcom/ramdump.c
View file

@ -140,7 +140,7 @@ static unsigned long offset_translate(loff_t user_offset,
*data_left);
if (rd_dev->segments[i].v_address)
*vaddr = rd_dev->segments[i].v_address + user_offset;
*vaddr = (void *) rd_dev->segments[i].v_address + user_offset;
return rd_dev->segments[i].address + user_offset;
}

2
include/soc/qcom/ramdump.h
View file

@ -11,7 +11,7 @@ struct device;
struct ramdump_segment {
char *name;
unsigned long address;
void *v_address;
volatile void __iomem *v_address;
unsigned long size;
};