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nvdimm acpi: let qemu handle _DSM method 

If dsm memory is successfully patched, we let qemu fully emulate
the dsm method

This patch saves _DSM input parameters into dsm memory, tell dsm
memory address to QEMU, then fetch the result from the dsm memory

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xiao Guangrong 2016-03-05 00:00:34 +08:00 committed by Michael S. Tsirkin
parent b99514135b
commit 18c440e1e1
1 changed files with 115 additions and 5 deletions
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120
hw/acpi/nvdimm.c
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@ -372,6 +372,24 @@ static void nvdimm_build_nfit(GSList *device_list, GArray *table_offsets,
g_array_free(structures, true);
}
struct NvdimmDsmIn {
uint32_t handle;
uint32_t revision;
uint32_t function;
/* the remaining size in the page is used by arg3. */
union {
uint8_t arg3[0];
};
} QEMU_PACKED;
typedef struct NvdimmDsmIn NvdimmDsmIn;
struct NvdimmDsmOut {
/* the size of buffer filled by QEMU. */
uint32_t len;
uint8_t data[0];
} QEMU_PACKED;
typedef struct NvdimmDsmOut NvdimmDsmOut;
static uint64_t
nvdimm_dsm_read(void *opaque, hwaddr addr, unsigned size)
{
@ -411,11 +429,18 @@ void nvdimm_init_acpi_state(AcpiNVDIMMState *state, MemoryRegion *io,
static void nvdimm_build_common_dsm(Aml *dev)
{
Aml *method, *ifctx, *function;
Aml *method, *ifctx, *function, *dsm_mem, *unpatched, *result_size;
uint8_t byte_list[1];
method = aml_method(NVDIMM_COMMON_DSM, 4, AML_NOTSERIALIZED);
method = aml_method(NVDIMM_COMMON_DSM, 4, AML_SERIALIZED);
function = aml_arg(2);
dsm_mem = aml_name(NVDIMM_ACPI_MEM_ADDR);
/*
* do not support any method if DSM memory address has not been
* patched.
*/
unpatched = aml_if(aml_equal(dsm_mem, aml_int(0x0)));
/*
* function 0 is called to inquire what functions are supported by
@ -424,12 +449,38 @@ static void nvdimm_build_common_dsm(Aml *dev)
ifctx = aml_if(aml_equal(function, aml_int(0)));
byte_list[0] = 0 /* No function Supported */;
aml_append(ifctx, aml_return(aml_buffer(1, byte_list)));
aml_append(method, ifctx);
aml_append(unpatched, ifctx);
/* No function is supported yet. */
byte_list[0] = 1 /* Not Supported */;
aml_append(method, aml_return(aml_buffer(1, byte_list)));
aml_append(unpatched, aml_return(aml_buffer(1, byte_list)));
aml_append(method, unpatched);
/*
* The HDLE indicates the DSM function is issued from which device,
* it is not used at this time as no function is supported yet.
* Currently we make it always be 0 for all the devices and will set
* the appropriate value once real function is implemented.
*/
aml_append(method, aml_store(aml_int(0x0), aml_name("HDLE")));
aml_append(method, aml_store(aml_arg(1), aml_name("REVS")));
aml_append(method, aml_store(aml_arg(2), aml_name("FUNC")));
/*
* tell QEMU about the real address of DSM memory, then QEMU
* gets the control and fills the result in DSM memory.
*/
aml_append(method, aml_store(dsm_mem, aml_name("NTFI")));
result_size = aml_local(1);
aml_append(method, aml_store(aml_name("RLEN"), result_size));
aml_append(method, aml_store(aml_shiftleft(result_size, aml_int(3)),
result_size));
aml_append(method, aml_create_field(aml_name("ODAT"), aml_int(0),
result_size, "OBUF"));
aml_append(method, aml_concatenate(aml_buffer(0, NULL), aml_name("OBUF"),
aml_arg(6)));
aml_append(method, aml_return(aml_arg(6)));
aml_append(dev, method);
}
@ -472,7 +523,7 @@ static void nvdimm_build_nvdimm_devices(GSList *device_list, Aml *root_dev)
static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
GArray *table_data, GArray *linker)
{
Aml *ssdt, *sb_scope, *dev;
Aml *ssdt, *sb_scope, *dev, *field;
int mem_addr_offset, nvdimm_ssdt;
acpi_add_table(table_offsets, table_data);
@ -497,6 +548,65 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
*/
aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0012")));
/* map DSM memory and IO into ACPI namespace. */
aml_append(dev, aml_operation_region("NPIO", AML_SYSTEM_IO,
aml_int(NVDIMM_ACPI_IO_BASE), NVDIMM_ACPI_IO_LEN));
aml_append(dev, aml_operation_region("NRAM", AML_SYSTEM_MEMORY,
aml_name(NVDIMM_ACPI_MEM_ADDR), TARGET_PAGE_SIZE));
/*
* DSM notifier:
* NTFI: write the address of DSM memory and notify QEMU to emulate
* the access.
*
* It is the IO port so that accessing them will cause VM-exit, the
* control will be transferred to QEMU.
*/
field = aml_field("NPIO", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
aml_append(field, aml_named_field("NTFI",
sizeof(uint32_t) * BITS_PER_BYTE));
aml_append(dev, field);
/*
* DSM input:
* HDLE: store device's handle, it's zero if the _DSM call happens
* on NVDIMM Root Device.
* REVS: store the Arg1 of _DSM call.
* FUNC: store the Arg2 of _DSM call.
* ARG3: store the Arg3 of _DSM call.
*
* They are RAM mapping on host so that these accesses never cause
* VM-EXIT.
*/
field = aml_field("NRAM", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
aml_append(field, aml_named_field("HDLE",
sizeof(typeof_field(NvdimmDsmIn, handle)) * BITS_PER_BYTE));
aml_append(field, aml_named_field("REVS",
sizeof(typeof_field(NvdimmDsmIn, revision)) * BITS_PER_BYTE));
aml_append(field, aml_named_field("FUNC",
sizeof(typeof_field(NvdimmDsmIn, function)) * BITS_PER_BYTE));
aml_append(field, aml_named_field("ARG3",
(TARGET_PAGE_SIZE - offsetof(NvdimmDsmIn, arg3)) *
BITS_PER_BYTE));
aml_append(dev, field);
/*
* DSM output:
* RLEN: the size of the buffer filled by QEMU.
* ODAT: the buffer QEMU uses to store the result.
*
* Since the page is reused by both input and out, the input data
* will be lost after storing new result into ODAT so we should fetch
* all the input data before writing the result.
*/
field = aml_field("NRAM", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
aml_append(field, aml_named_field("RLEN",
sizeof(typeof_field(NvdimmDsmOut, len)) * BITS_PER_BYTE));
aml_append(field, aml_named_field("ODAT",
(TARGET_PAGE_SIZE - offsetof(NvdimmDsmOut, data)) *
BITS_PER_BYTE));
aml_append(dev, field);
nvdimm_build_common_dsm(dev);
nvdimm_build_device_dsm(dev);