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yus8MOCDQ0+1vr/OFz+JnXwMsqkGRC1xYgUw5XPZHjc067LKHqzvlYhDDIXJlQfBGhIgWvgnXNCzZCeFdJV71bv0Nm7IpxVAE6YZ5+mhmao= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR10MB1629 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10196 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 adultscore=0 malwarescore=0 bulkscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112130092 X-Proofpoint-ORIG-GUID: uZx_h6sI99DNnYo-XVWIGHwNxUCfZ7bp X-Proofpoint-GUID: uZx_h6sI99DNnYo-XVWIGHwNxUCfZ7bp Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/10/21 12:55 AM, Zhen Lei wrote: > From: Chen Zhou > > When reserving crashkernel in high memory, some low memory is reserved > for crash dump kernel devices and never mapped by the first kernel. > This memory range is advertised to crash dump kernel via DT property > under /chosen, > linux,usable-memory-range = > > We reused the DT property linux,usable-memory-range and made the low > memory region as the second range "BASE2 SIZE2", which keeps compatibility > with existing user-space and older kdump kernels. > > Crash dump kernel reads this property at boot time and call memblock_add() > to add the low memory region after memblock_cap_memory_range() has been > called. > > Signed-off-by: Chen Zhou > Signed-off-by: Zhen Lei > Tested-by: Dave Kleikamp Acked-by: John Donnelly > --- > drivers/of/fdt.c | 33 +++++++++++++++++++++++---------- > 1 file changed, 23 insertions(+), 10 deletions(-) > > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c > index 37b477a51175359..f7b72fa773250ad 100644 > --- a/drivers/of/fdt.c > +++ b/drivers/of/fdt.c > @@ -967,6 +967,15 @@ static void __init early_init_dt_check_for_elfcorehdr(unsigned long node) > > static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND; > > +/* > + * The main usage of linux,usable-memory-range is for crash dump kernel. > + * Originally, the number of usable-memory regions is one. Now there may > + * be two regions, low region and high region. > + * To make compatibility with existing user-space and older kdump, the low > + * region is always the last range of linux,usable-memory-range if exist. > + */ > +#define MAX_USABLE_RANGES 2 > + > /** > * early_init_dt_check_for_usable_mem_range - Decode usable memory range > * location from flat tree > @@ -974,10 +983,9 @@ static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND; > */ > static void __init early_init_dt_check_for_usable_mem_range(unsigned long node) > { > - const __be32 *prop; > - int len; > - phys_addr_t cap_mem_addr; > - phys_addr_t cap_mem_size; > + struct memblock_region rgn[MAX_USABLE_RANGES] = {0}; > + const __be32 *prop, *endp; > + int len, i; > > if ((long)node < 0) > return; > @@ -985,16 +993,21 @@ static void __init early_init_dt_check_for_usable_mem_range(unsigned long node) > pr_debug("Looking for usable-memory-range property... "); > > prop = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len); > - if (!prop || (len < (dt_root_addr_cells + dt_root_size_cells))) > + if (!prop || (len % (dt_root_addr_cells + dt_root_size_cells))) > return; > > - cap_mem_addr = dt_mem_next_cell(dt_root_addr_cells, &prop); > - cap_mem_size = dt_mem_next_cell(dt_root_size_cells, &prop); > + endp = prop + (len / sizeof(__be32)); > + for (i = 0; i < MAX_USABLE_RANGES && prop < endp; i++) { > + rgn[i].base = dt_mem_next_cell(dt_root_addr_cells, &prop); > + rgn[i].size = dt_mem_next_cell(dt_root_size_cells, &prop); > > - pr_debug("cap_mem_start=%pa cap_mem_size=%pa\n", &cap_mem_addr, > - &cap_mem_size); > + pr_debug("cap_mem_regions[%d]: base=%pa, size=%pa\n", > + i, &rgn[i].base, &rgn[i].size); > + } > > - memblock_cap_memory_range(cap_mem_addr, cap_mem_size); > + memblock_cap_memory_range(rgn[0].base, rgn[0].size); > + for (i = 1; i < MAX_USABLE_RANGES && rgn[i].size; i++) > + memblock_add(rgn[i].base, rgn[i].size); > } > > #ifdef CONFIG_SERIAL_EARLYCON