|
|
6bd801 |
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
6bd801 |
From: Daniel Axtens <dja@axtens.net>
|
|
|
6bd801 |
Date: Fri, 16 Apr 2021 11:48:46 +1000
|
|
|
6bd801 |
Subject: [PATCH] ieee1275: request memory with ibm,client-architecture-support
|
|
|
6bd801 |
|
|
|
6bd801 |
On PowerVM, the first time we boot a Linux partition, we may only get
|
|
|
6bd801 |
256MB of real memory area, even if the partition has more memory.
|
|
|
6bd801 |
|
|
|
6bd801 |
This isn't really enough. Fortunately, the Power Architecture Platform
|
|
|
6bd801 |
Reference (PAPR) defines a method we can call to ask for more memory.
|
|
|
6bd801 |
This is part of the broad and powerful ibm,client-architecture-support
|
|
|
6bd801 |
(CAS) method.
|
|
|
6bd801 |
|
|
|
6bd801 |
CAS can do an enormous amount of things on a PAPR platform: as well as
|
|
|
6bd801 |
asking for memory, you can set the supported processor level, the interrupt
|
|
|
6bd801 |
controller, hash vs radix mmu, and so on. We want to touch as little of
|
|
|
6bd801 |
this as possible because we don't want to step on the toes of the future OS.
|
|
|
6bd801 |
|
|
|
6bd801 |
If:
|
|
|
6bd801 |
|
|
|
6bd801 |
- we are running under what we think is PowerVM (compatible property of /
|
|
|
6bd801 |
begins with "IBM"), and
|
|
|
6bd801 |
|
|
|
6bd801 |
- the full amount of RMA is less than 512MB (as determined by the reg
|
|
|
6bd801 |
property of /memory)
|
|
|
6bd801 |
|
|
|
6bd801 |
then call CAS as follows: (refer to the Linux on Power Architecture
|
|
|
6bd801 |
Reference, LoPAR, which is public, at B.5.2.3):
|
|
|
6bd801 |
|
|
|
6bd801 |
- Use the "any" PVR value and supply 2 option vectors.
|
|
|
6bd801 |
|
|
|
6bd801 |
- Set option vector 1 (PowerPC Server Processor Architecture Level)
|
|
|
6bd801 |
to "ignore".
|
|
|
6bd801 |
|
|
|
6bd801 |
- Set option vector 2 with default or Linux-like options, including a
|
|
|
6bd801 |
min-rma-size of 512MB.
|
|
|
6bd801 |
|
|
|
6bd801 |
This will cause a CAS reboot and the partition will restart with 512MB
|
|
|
6bd801 |
of RMA. Grub will notice the 512MB and not call CAS again.
|
|
|
6bd801 |
|
|
|
6bd801 |
(A partition can be configured with only 256MB of memory, which would
|
|
|
6bd801 |
mean this request couldn't be satisfied, but PFW refuses to load with
|
|
|
6bd801 |
only 256MB of memory, so it's a bit moot. SLOF will run fine with 256MB,
|
|
|
6bd801 |
but we will never call CAS under qemu/SLOF because /compatible won't
|
|
|
6bd801 |
begin with "IBM".)
|
|
|
6bd801 |
|
|
|
6bd801 |
One of the first things Linux does while still running under OpenFirmware
|
|
|
6bd801 |
is to call CAS with a much fuller set of options (including asking for
|
|
|
6bd801 |
512MB of memory). This includes a much more restrictive set of PVR values
|
|
|
6bd801 |
and processor support levels, and this will induce another reboot. On this
|
|
|
6bd801 |
reboot grub will again notice the higher RMA, and not call CAS. We will get
|
|
|
6bd801 |
to Linux, Linux will call CAS but because the values are now set for Linux
|
|
|
6bd801 |
this will not induce another CAS reboot and we will finally boot.
|
|
|
6bd801 |
|
|
|
6bd801 |
On all subsequent boots, everything will be configured with 512MB of RMA
|
|
|
6bd801 |
and all the settings Linux likes, so there will be no further CAS reboots.
|
|
|
6bd801 |
|
|
|
6bd801 |
(phyp is super sticky with the RMA size - it persists even on cold boots.
|
|
|
6bd801 |
So if you've ever booted Linux in a partition, you'll probably never have
|
|
|
6bd801 |
grub call CAS. It'll only ever fire the first time a partition loads grub,
|
|
|
6bd801 |
or if you deliberately lower the amount of memory your partition has below
|
|
|
6bd801 |
512MB.)
|
|
|
6bd801 |
|
|
|
6bd801 |
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
|
6bd801 |
---
|
|
|
6bd801 |
grub-core/kern/ieee1275/cmain.c | 3 +
|
|
|
6bd801 |
grub-core/kern/ieee1275/init.c | 144 ++++++++++++++++++++++++++++++++++++++-
|
|
|
6bd801 |
include/grub/ieee1275/ieee1275.h | 8 ++-
|
|
|
6bd801 |
3 files changed, 152 insertions(+), 3 deletions(-)
|
|
|
6bd801 |
|
|
|
6bd801 |
diff --git a/grub-core/kern/ieee1275/cmain.c b/grub-core/kern/ieee1275/cmain.c
|
|
|
6bd801 |
index 3e14f539368..9d5156462c1 100644
|
|
|
6bd801 |
--- a/grub-core/kern/ieee1275/cmain.c
|
|
|
6bd801 |
+++ b/grub-core/kern/ieee1275/cmain.c
|
|
|
6bd801 |
@@ -124,6 +124,9 @@ grub_ieee1275_find_options (void)
|
|
|
6bd801 |
break;
|
|
|
6bd801 |
}
|
|
|
6bd801 |
}
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ if (grub_strncmp (tmp, "IBM,", 4) == 0)
|
|
|
6bd801 |
+ grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_CAN_TRY_CAS_FOR_MORE_MEMORY);
|
|
|
6bd801 |
}
|
|
|
6bd801 |
|
|
|
6bd801 |
if (is_smartfirmware)
|
|
|
6bd801 |
diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
|
|
|
6bd801 |
index a6e169bd003..adf4bd5a88b 100644
|
|
|
6bd801 |
--- a/grub-core/kern/ieee1275/init.c
|
|
|
6bd801 |
+++ b/grub-core/kern/ieee1275/init.c
|
|
|
6bd801 |
@@ -238,6 +238,135 @@ heap_init (grub_uint64_t addr, grub_uint64_t len, grub_memory_type_t type,
|
|
|
6bd801 |
return 0;
|
|
|
6bd801 |
}
|
|
|
6bd801 |
|
|
|
6bd801 |
+/* How much memory does OF believe it has? (regardless of whether
|
|
|
6bd801 |
+ it's accessible or not) */
|
|
|
6bd801 |
+static grub_err_t
|
|
|
6bd801 |
+grub_ieee1275_total_mem (grub_uint64_t *total)
|
|
|
6bd801 |
+{
|
|
|
6bd801 |
+ grub_ieee1275_phandle_t root;
|
|
|
6bd801 |
+ grub_ieee1275_phandle_t memory;
|
|
|
6bd801 |
+ grub_uint32_t reg[4];
|
|
|
6bd801 |
+ grub_ssize_t reg_size;
|
|
|
6bd801 |
+ grub_uint32_t address_cells = 1;
|
|
|
6bd801 |
+ grub_uint32_t size_cells = 1;
|
|
|
6bd801 |
+ grub_uint64_t size;
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ /* If we fail to get to the end, report 0. */
|
|
|
6bd801 |
+ *total = 0;
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ /* Determine the format of each entry in `reg'. */
|
|
|
6bd801 |
+ grub_ieee1275_finddevice ("/", &root);
|
|
|
6bd801 |
+ grub_ieee1275_get_integer_property (root, "#address-cells", &address_cells,
|
|
|
6bd801 |
+ sizeof address_cells, 0);
|
|
|
6bd801 |
+ grub_ieee1275_get_integer_property (root, "#size-cells", &size_cells,
|
|
|
6bd801 |
+ sizeof size_cells, 0);
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ if (size_cells > address_cells)
|
|
|
6bd801 |
+ address_cells = size_cells;
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ /* Load `/memory/reg'. */
|
|
|
6bd801 |
+ if (grub_ieee1275_finddevice ("/memory", &memory))
|
|
|
6bd801 |
+ return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
|
|
|
6bd801 |
+ "couldn't find /memory node");
|
|
|
6bd801 |
+ if (grub_ieee1275_get_integer_property (memory, "reg", reg,
|
|
|
6bd801 |
+ sizeof reg, ®_size))
|
|
|
6bd801 |
+ return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
|
|
|
6bd801 |
+ "couldn't examine /memory/reg property");
|
|
|
6bd801 |
+ if (reg_size < 0 || (grub_size_t) reg_size > sizeof (reg))
|
|
|
6bd801 |
+ return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
|
|
|
6bd801 |
+ "/memory response buffer exceeded");
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_BROKEN_ADDRESS_CELLS))
|
|
|
6bd801 |
+ {
|
|
|
6bd801 |
+ address_cells = 1;
|
|
|
6bd801 |
+ size_cells = 1;
|
|
|
6bd801 |
+ }
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ /* Decode only the size */
|
|
|
6bd801 |
+ size = reg[address_cells];
|
|
|
6bd801 |
+ if (size_cells == 2)
|
|
|
6bd801 |
+ size = (size << 32) | reg[address_cells + 1];
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ *total = size;
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ return grub_errno;
|
|
|
6bd801 |
+}
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+/* Based on linux - arch/powerpc/kernel/prom_init.c */
|
|
|
6bd801 |
+struct option_vector2 {
|
|
|
6bd801 |
+ grub_uint8_t byte1;
|
|
|
6bd801 |
+ grub_uint16_t reserved;
|
|
|
6bd801 |
+ grub_uint32_t real_base;
|
|
|
6bd801 |
+ grub_uint32_t real_size;
|
|
|
6bd801 |
+ grub_uint32_t virt_base;
|
|
|
6bd801 |
+ grub_uint32_t virt_size;
|
|
|
6bd801 |
+ grub_uint32_t load_base;
|
|
|
6bd801 |
+ grub_uint32_t min_rma;
|
|
|
6bd801 |
+ grub_uint32_t min_load;
|
|
|
6bd801 |
+ grub_uint8_t min_rma_percent;
|
|
|
6bd801 |
+ grub_uint8_t max_pft_size;
|
|
|
6bd801 |
+} __attribute__((packed));
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+struct pvr_entry {
|
|
|
6bd801 |
+ grub_uint32_t mask;
|
|
|
6bd801 |
+ grub_uint32_t entry;
|
|
|
6bd801 |
+};
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+struct cas_vector {
|
|
|
6bd801 |
+ struct {
|
|
|
6bd801 |
+ struct pvr_entry terminal;
|
|
|
6bd801 |
+ } pvr_list;
|
|
|
6bd801 |
+ grub_uint8_t num_vecs;
|
|
|
6bd801 |
+ grub_uint8_t vec1_size;
|
|
|
6bd801 |
+ grub_uint8_t vec1;
|
|
|
6bd801 |
+ grub_uint8_t vec2_size;
|
|
|
6bd801 |
+ struct option_vector2 vec2;
|
|
|
6bd801 |
+} __attribute__((packed));
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+/* Call ibm,client-architecture-support to try to get more RMA.
|
|
|
6bd801 |
+ We ask for 512MB which should be enough to verify a distro kernel.
|
|
|
6bd801 |
+ We ignore most errors: if we don't succeed we'll proceed with whatever
|
|
|
6bd801 |
+ memory we have. */
|
|
|
6bd801 |
+static void
|
|
|
6bd801 |
+grub_ieee1275_ibm_cas (void)
|
|
|
6bd801 |
+{
|
|
|
6bd801 |
+ int rc;
|
|
|
6bd801 |
+ grub_ieee1275_ihandle_t root;
|
|
|
6bd801 |
+ struct cas_args {
|
|
|
6bd801 |
+ struct grub_ieee1275_common_hdr common;
|
|
|
6bd801 |
+ grub_ieee1275_cell_t method;
|
|
|
6bd801 |
+ grub_ieee1275_ihandle_t ihandle;
|
|
|
6bd801 |
+ grub_ieee1275_cell_t cas_addr;
|
|
|
6bd801 |
+ grub_ieee1275_cell_t result;
|
|
|
6bd801 |
+ } args;
|
|
|
6bd801 |
+ struct cas_vector vector = {
|
|
|
6bd801 |
+ .pvr_list = { { 0x00000000, 0xffffffff } }, /* any processor */
|
|
|
6bd801 |
+ .num_vecs = 2 - 1,
|
|
|
6bd801 |
+ .vec1_size = 0,
|
|
|
6bd801 |
+ .vec1 = 0x80, /* ignore */
|
|
|
6bd801 |
+ .vec2_size = 1 + sizeof(struct option_vector2) - 2,
|
|
|
6bd801 |
+ .vec2 = {
|
|
|
6bd801 |
+ 0, 0, -1, -1, -1, -1, -1, 512, -1, 0, 48
|
|
|
6bd801 |
+ },
|
|
|
6bd801 |
+ };
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ INIT_IEEE1275_COMMON (&args.common, "call-method", 3, 2);
|
|
|
6bd801 |
+ args.method = (grub_ieee1275_cell_t)"ibm,client-architecture-support";
|
|
|
6bd801 |
+ rc = grub_ieee1275_open("/", &root);
|
|
|
6bd801 |
+ if (rc) {
|
|
|
6bd801 |
+ grub_error (GRUB_ERR_IO, "could not open root when trying to call CAS");
|
|
|
6bd801 |
+ return;
|
|
|
6bd801 |
+ }
|
|
|
6bd801 |
+ args.ihandle = root;
|
|
|
6bd801 |
+ args.cas_addr = (grub_ieee1275_cell_t)&vector;
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ grub_printf("Calling ibm,client-architecture-support...");
|
|
|
6bd801 |
+ IEEE1275_CALL_ENTRY_FN (&args);
|
|
|
6bd801 |
+ grub_printf("done\n");
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ grub_ieee1275_close(root);
|
|
|
6bd801 |
+}
|
|
|
6bd801 |
+
|
|
|
6bd801 |
static void
|
|
|
6bd801 |
grub_claim_heap (void)
|
|
|
6bd801 |
{
|
|
|
6bd801 |
@@ -245,11 +374,22 @@ grub_claim_heap (void)
|
|
|
6bd801 |
|
|
|
6bd801 |
if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_FORCE_CLAIM))
|
|
|
6bd801 |
{
|
|
|
6bd801 |
- heap_init (GRUB_IEEE1275_STATIC_HEAP_START, GRUB_IEEE1275_STATIC_HEAP_LEN,
|
|
|
6bd801 |
- 1, &total);
|
|
|
6bd801 |
+ heap_init (GRUB_IEEE1275_STATIC_HEAP_START,
|
|
|
6bd801 |
+ GRUB_IEEE1275_STATIC_HEAP_LEN, 1, &total);
|
|
|
6bd801 |
return;
|
|
|
6bd801 |
}
|
|
|
6bd801 |
|
|
|
6bd801 |
+ if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_CAN_TRY_CAS_FOR_MORE_MEMORY))
|
|
|
6bd801 |
+ {
|
|
|
6bd801 |
+ grub_uint64_t rma_size;
|
|
|
6bd801 |
+ grub_err_t err;
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ err = grub_ieee1275_total_mem (&rma_size);
|
|
|
6bd801 |
+ /* if we have an error, don't call CAS, just hope for the best */
|
|
|
6bd801 |
+ if (!err && rma_size < (512 * 1024 * 1024))
|
|
|
6bd801 |
+ grub_ieee1275_ibm_cas();
|
|
|
6bd801 |
+ }
|
|
|
6bd801 |
+
|
|
|
6bd801 |
grub_machine_mmap_iterate (heap_size, &total);
|
|
|
6bd801 |
|
|
|
6bd801 |
total = total / 4;
|
|
|
6bd801 |
diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
|
|
|
6bd801 |
index ca08bd96681..131808d6197 100644
|
|
|
6bd801 |
--- a/include/grub/ieee1275/ieee1275.h
|
|
|
6bd801 |
+++ b/include/grub/ieee1275/ieee1275.h
|
|
|
6bd801 |
@@ -147,7 +147,13 @@ enum grub_ieee1275_flag
|
|
|
6bd801 |
|
|
|
6bd801 |
GRUB_IEEE1275_FLAG_CURSORONOFF_ANSI_BROKEN,
|
|
|
6bd801 |
|
|
|
6bd801 |
- GRUB_IEEE1275_FLAG_DISABLE_VIDEO_SUPPORT
|
|
|
6bd801 |
+ GRUB_IEEE1275_FLAG_DISABLE_VIDEO_SUPPORT,
|
|
|
6bd801 |
+
|
|
|
6bd801 |
+ /* On PFW, the first time we boot a Linux partition, we may only get 256MB
|
|
|
6bd801 |
+ of real memory area, even if the partition has more memory. Set this flag
|
|
|
6bd801 |
+ if we think we're running under PFW. Then, if this flag is set, and the
|
|
|
6bd801 |
+ RMA is only 256MB in size, try asking for more with CAS. */
|
|
|
6bd801 |
+ GRUB_IEEE1275_FLAG_CAN_TRY_CAS_FOR_MORE_MEMORY,
|
|
|
6bd801 |
};
|
|
|
6bd801 |
|
|
|
6bd801 |
extern int EXPORT_FUNC(grub_ieee1275_test_flag) (enum grub_ieee1275_flag flag);
|