_FIT is required for hotplug support, guest will inquire the
updated device info from it if a hotplug event is received
As FIT buffer is not completely mapped into guest address space,
Read_FIT method is introduced to read NFIT structures blob from
QEMU, The buffer is concatenated before _FIT return
Refer to docs/specs/acpi-nvdimm.txt for detailed design
Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
---
docs/specs/acpi_nvdimm.txt | 61 ++++++++++++--
hw/acpi/nvdimm.c | 198 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 252 insertions(+), 7 deletions(-)
diff --git a/docs/specs/acpi_nvdimm.txt b/docs/specs/acpi_nvdimm.txt
index 0fdd251..63cb63f 100644
--- a/docs/specs/acpi_nvdimm.txt
+++ b/docs/specs/acpi_nvdimm.txt
@@ -65,8 +65,8 @@ _FIT(Firmware Interface Table)
The detailed definition of the structure can be found at ACPI 6.0: 5.2.25
NVDIMM Firmware Interface Table (NFIT).
-QEMU NVDIMM Implemention
-========================
+QEMU NVDIMM Implementation
+==========================
QEMU uses 4 bytes IO Port starting from 0x0a18 and a RAM-based memory page
for NVDIMM ACPI.
@@ -82,6 +82,16 @@ Memory:
ACPI writes _DSM Input Data (based on the offset in the page):
[0x0 - 0x3]: 4 bytes, NVDIMM Device Handle, 0 is reserved for NVDIMM
Root device.
+
+ The handle is completely QEMU internal thing, the values in
+ range [1, 0xFFFF] indicate nvdimm device. Other values are
+ reserved for other purposes.
+
+ Reserved handles:
+ 0 is reserved for nvdimm root device named NVDR.
+ 0x10000 is reserved for QEMU internal DSM function called on
+ the root device.
+
[0x4 - 0x7]: 4 bytes, Revision ID, that is the Arg1 of _DSM method.
[0x8 - 0xB]: 4 bytes. Function Index, that is the Arg2 of _DSM method.
[0xC - 0xFFF]: 4084 bytes, the Arg3 of _DSM method.
@@ -127,6 +137,47 @@ _DSM process diagram:
| result from the page | | |
+--------------------------+ +--------------+
- _FIT implementation
- -------------------
- TODO (will fill it when nvdimm hotplug is introduced)
+QEMU internal use only _DSM function
+------------------------------------
+1) Read FIT
+ _FIT method uses _DSM method to fetch NFIT structures blob from QEMU
+ in 1 page sized increments which are then concatenated and returned
+ as _FIT method result.
+
+ Input parameters:
+ Arg0 – UUID {set to 648B9CF2-CDA1-4312-8AD9-49C4AF32BD62}
+ Arg1 – Revision ID (set to 1)
+ Arg2 - Function Index, 0x1
+ Arg3 - A package containing a buffer whose layout is as follows:
+
+ +----------+--------+--------+-------------------------------------------+
+ | Field | Length | Offset | Description |
+ +----------+--------+--------+-------------------------------------------+
+ | offset | 4 | 0 | offset in QEMU's NFIT structures blob to |
+ | | | | read from |
+ +----------+--------+--------+-------------------------------------------+
+
+ Output layout in the dsm memory page:
+ +----------+--------+--------+-------------------------------------------+
+ | Field | Length | Offset | Description |
+ +----------+--------+--------+-------------------------------------------+
+ | length | 4 | 0 | length of entire returned data |
+ | | | | (including the header) |
+ +----------+-----------------+-------------------------------------------+
+ | | | | return status codes |
+ | | | | 0x0 - success |
+ | | | | 0x100 - error caused by NFIT update while |
+ | status | 4 | 4 | read by _FIT wasn't completed, other |
+ | | | | codes follow Chapter 3 in DSM Spec Rev1 |
+ +----------+-----------------+-------------------------------------------+
+ | fit data | Varies | 8 | contains FIT data, this field is present |
+ | | | | if status field is 0; |
+ +----------+--------+--------+-------------------------------------------+
+
+ The FIT offset is maintained by the OSPM itself, current offset plus
+ the size of the fit data returned by the function is the next offset
+ OSPM should read. When all FIT data has been read out, zero length is
+ returned.
+
+ If it returns status code 0x100, OSPM should restart to read FIT (read
+ from offset 0 again).
diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index d9d1ef7..f82ae4a 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -478,6 +478,22 @@ typedef struct NvdimmFuncSetLabelDataIn NvdimmFuncSetLabelDataIn;
QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncSetLabelDataIn) +
offsetof(NvdimmDsmIn, arg3) > 4096);
+struct NvdimmFuncReadFITIn {
+ uint32_t offset; /* the offset into FIT buffer. */
+} QEMU_PACKED;
+typedef struct NvdimmFuncReadFITIn NvdimmFuncReadFITIn;
+QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncReadFITIn) +
+ offsetof(NvdimmDsmIn, arg3) > 4096);
+
+struct NvdimmFuncReadFITOut {
+ /* the size of buffer filled by QEMU. */
+ uint32_t len;
+ uint32_t func_ret_status; /* return status code. */
+ uint8_t fit[0]; /* the FIT data. */
+} QEMU_PACKED;
+typedef struct NvdimmFuncReadFITOut NvdimmFuncReadFITOut;
+QEMU_BUILD_BUG_ON(sizeof(NvdimmFuncReadFITOut) > 4096);
+
static void
nvdimm_dsm_function0(uint32_t supported_func, hwaddr dsm_mem_addr)
{
@@ -502,6 +518,73 @@ nvdimm_dsm_no_payload(uint32_t func_ret_status, hwaddr dsm_mem_addr)
#define NVDIMM_DSM_RET_STATUS_UNSUPPORT 1 /* Not Supported */
#define NVDIMM_DSM_RET_STATUS_NOMEMDEV 2 /* Non-Existing Memory Device */
#define NVDIMM_DSM_RET_STATUS_INVALID 3 /* Invalid Input Parameters */
+#define NVDIMM_DSM_RET_STATUS_FIT_CHANGED 0x100 /* FIT Changed */
+
+#define NVDIMM_QEMU_RSVD_HANDLE_ROOT 0x10000
+
+/* Read FIT data, defined in docs/specs/acpi_nvdimm.txt. */
+static void nvdimm_dsm_func_read_fit(AcpiNVDIMMState *state, NvdimmDsmIn *in,
+ hwaddr dsm_mem_addr)
+{
+ NvdimmFitBuffer *fit_buf = &state->fit_buf;
+ NvdimmFuncReadFITIn *read_fit;
+ NvdimmFuncReadFITOut *read_fit_out;
+ GArray *fit;
+ uint32_t read_len = 0, func_ret_status, offset;
+ int size;
+
+ read_fit = (NvdimmFuncReadFITIn *)in->arg3;
+ offset = le32_to_cpu(read_fit->offset);
+
+ fit = fit_buf->fit;
+
+ nvdimm_debug("Read FIT: offset %#x FIT size %#x Dirty %s.\n",
+ offset, fit->len, fit_buf->dirty ? "Yes" : "No");
+
+ /* It is the first time to read FIT. */
+ if (!offset) {
+ fit_buf->dirty = false;
+ } else if (fit_buf->dirty) { /* FIT has been changed during RFIT. */
+ func_ret_status = NVDIMM_DSM_RET_STATUS_FIT_CHANGED;
+ goto exit;
+ }
+
+ if (offset > fit->len) {
+ func_ret_status = NVDIMM_DSM_RET_STATUS_INVALID;
+ goto exit;
+ }
+
+ func_ret_status = NVDIMM_DSM_RET_STATUS_SUCCESS;
+ read_len = MIN(fit->len - offset, 4096 - sizeof(NvdimmFuncReadFITOut));
+
+exit:
+ size = sizeof(NvdimmFuncReadFITOut) + read_len;
+ read_fit_out = g_malloc(size);
+
+ read_fit_out->len = cpu_to_le32(size);
+ read_fit_out->func_ret_status = cpu_to_le32(func_ret_status);
+ memcpy(read_fit_out->fit, fit->data + offset, read_len);
+
+ cpu_physical_memory_write(dsm_mem_addr, read_fit_out, size);
+
+ g_free(read_fit_out);
+}
+
+static void
+nvdimm_dsm_handle_reserved_root_method(AcpiNVDIMMState *state,
+ NvdimmDsmIn *in, hwaddr dsm_mem_addr)
+{
+ switch (in->function) {
+ case 0x0:
+ nvdimm_dsm_function0(0x1 | 1 << 1 /* Read FIT */, dsm_mem_addr);
+ return;
+ case 0x1 /* Read FIT */:
+ nvdimm_dsm_func_read_fit(state, in, dsm_mem_addr);
+ return;
+ }
+
+ nvdimm_dsm_no_payload(NVDIMM_DSM_RET_STATUS_UNSUPPORT, dsm_mem_addr);
+}
static void nvdimm_dsm_root(NvdimmDsmIn *in, hwaddr dsm_mem_addr)
{
@@ -730,6 +813,7 @@ nvdimm_dsm_read(void *opaque, hwaddr addr, unsigned size)
static void
nvdimm_dsm_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
{
+ AcpiNVDIMMState *state = opaque;
NvdimmDsmIn *in;
hwaddr dsm_mem_addr = val;
@@ -757,6 +841,11 @@ nvdimm_dsm_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
goto exit;
}
+ if (in->handle == NVDIMM_QEMU_RSVD_HANDLE_ROOT) {
+ nvdimm_dsm_handle_reserved_root_method(state, in, dsm_mem_addr);
+ goto exit;
+ }
+
/* Handle 0 is reserved for NVDIMM Root Device. */
if (!in->handle) {
nvdimm_dsm_root(in, dsm_mem_addr);
@@ -809,9 +898,13 @@ void nvdimm_init_acpi_state(AcpiNVDIMMState *state, MemoryRegion *io,
#define NVDIMM_DSM_OUT_BUF_SIZE "RLEN"
#define NVDIMM_DSM_OUT_BUF "ODAT"
+#define NVDIMM_DSM_RFIT_STATUS "RSTA"
+
+#define NVDIMM_QEMU_RSVD_UUID "648B9CF2-CDA1-4312-8AD9-49C4AF32BD62"
+
static void nvdimm_build_common_dsm(Aml *dev)
{
- Aml *method, *ifctx, *function, *handle, *uuid, *dsm_mem;
+ Aml *method, *ifctx, *function, *handle, *uuid, *dsm_mem, *elsectx2;
Aml *elsectx, *unsupport, *unpatched, *expected_uuid, *uuid_invalid;
Aml *pckg, *pckg_index, *pckg_buf, *field, *dsm_out_buf, *dsm_out_buf_size;
uint8_t byte_list[1];
@@ -900,9 +993,15 @@ static void nvdimm_build_common_dsm(Aml *dev)
/* UUID for NVDIMM Root Device */, expected_uuid));
aml_append(method, ifctx);
elsectx = aml_else();
- aml_append(elsectx, aml_store(
+ ifctx = aml_if(aml_equal(handle, aml_int(NVDIMM_QEMU_RSVD_HANDLE_ROOT)));
+ aml_append(ifctx, aml_store(aml_touuid(NVDIMM_QEMU_RSVD_UUID
+ /* UUID for QEMU internal use */), expected_uuid));
+ aml_append(elsectx, ifctx);
+ elsectx2 = aml_else();
+ aml_append(elsectx2, aml_store(
aml_touuid("4309AC30-0D11-11E4-9191-0800200C9A66")
/* UUID for NVDIMM Devices */, expected_uuid));
+ aml_append(elsectx, elsectx2);
aml_append(method, elsectx);
uuid_invalid = aml_lnot(aml_equal(uuid, expected_uuid));
@@ -982,6 +1081,100 @@ static void nvdimm_build_device_dsm(Aml *dev, uint32_t handle)
aml_append(dev, method);
}
+static void nvdimm_build_fit_method(Aml *dev)
+{
+ Aml *method, *pkg, *buf, *buf_size, *offset, *call_result;
+ Aml *whilectx, *ifcond, *ifctx, *elsectx, *fit;
+
+ buf = aml_local(0);
+ buf_size = aml_local(1);
+ fit = aml_local(2);
+
+ aml_append(dev, aml_name_decl(NVDIMM_DSM_RFIT_STATUS, aml_int(0)));
+
+ /* build helper function, RFIT. */
+ method = aml_method("RFIT", 1, AML_SERIALIZED);
+ aml_append(method, aml_name_decl("OFST", aml_int(0)));
+
+ /* prepare input package. */
+ pkg = aml_package(1);
+ aml_append(method, aml_store(aml_arg(0), aml_name("OFST")));
+ aml_append(pkg, aml_name("OFST"));
+
+ /* call Read_FIT function. */
+ call_result = aml_call5(NVDIMM_COMMON_DSM,
+ aml_touuid(NVDIMM_QEMU_RSVD_UUID),
+ aml_int(1) /* Revision 1 */,
+ aml_int(0x1) /* Read FIT */,
+ pkg, aml_int(NVDIMM_QEMU_RSVD_HANDLE_ROOT));
+ aml_append(method, aml_store(call_result, buf));
+
+ /* handle _DSM result. */
+ aml_append(method, aml_create_dword_field(buf,
+ aml_int(0) /* offset at byte 0 */, "STAU"));
+
+ aml_append(method, aml_store(aml_name("STAU"),
+ aml_name(NVDIMM_DSM_RFIT_STATUS)));
+
+ /* if something is wrong during _DSM. */
+ ifcond = aml_equal(aml_int(0 /* Success */), aml_name("STAU"));
+ ifctx = aml_if(aml_lnot(ifcond));
+ aml_append(ifctx, aml_return(aml_buffer(0, NULL)));
+ aml_append(method, ifctx);
+
+ aml_append(method, aml_store(aml_sizeof(buf), buf_size));
+ aml_append(method, aml_subtract(buf_size,
+ aml_int(4) /* the size of "STAU" */, buf_size));
+
+ /* if we read the end of fit. */
+ ifctx = aml_if(aml_equal(buf_size, aml_int(0)));
+ aml_append(ifctx, aml_return(aml_buffer(0, NULL)));
+ aml_append(method, ifctx);
+
+ aml_append(method, aml_create_field(buf,
+ aml_int(4 * BITS_PER_BYTE), /* offset at byte 4.*/
+ aml_shiftleft(buf_size, aml_int(3)), "BUFF"));
+ aml_append(method, aml_return(aml_name("BUFF")));
+ aml_append(dev, method);
+
+ /* build _FIT. */
+ method = aml_method("_FIT", 0, AML_SERIALIZED);
+ offset = aml_local(3);
+
+ aml_append(method, aml_store(aml_buffer(0, NULL), fit));
+ aml_append(method, aml_store(aml_int(0), offset));
+
+ whilectx = aml_while(aml_int(1));
+ aml_append(whilectx, aml_store(aml_call1("RFIT", offset), buf));
+ aml_append(whilectx, aml_store(aml_sizeof(buf), buf_size));
+
+ /*
+ * if fit buffer was changed during RFIT, read from the beginning
+ * again.
+ */
+ ifctx = aml_if(aml_equal(aml_name(NVDIMM_DSM_RFIT_STATUS),
+ aml_int(NVDIMM_DSM_RET_STATUS_FIT_CHANGED)));
+ aml_append(ifctx, aml_store(aml_buffer(0, NULL), fit));
+ aml_append(ifctx, aml_store(aml_int(0), offset));
+ aml_append(whilectx, ifctx);
+
+ elsectx = aml_else();
+
+ /* finish fit read if no data is read out. */
+ ifctx = aml_if(aml_equal(buf_size, aml_int(0)));
+ aml_append(ifctx, aml_return(fit));
+ aml_append(elsectx, ifctx);
+
+ /* update the offset. */
+ aml_append(elsectx, aml_add(offset, buf_size, offset));
+ /* append the data we read out to the fit buffer. */
+ aml_append(elsectx, aml_concatenate(fit, buf, fit));
+ aml_append(whilectx, elsectx);
+ aml_append(method, whilectx);
+
+ aml_append(dev, method);
+}
+
static void nvdimm_build_nvdimm_devices(Aml *root_dev, uint32_t ram_slots)
{
uint32_t slot;
@@ -1040,6 +1233,7 @@ static void nvdimm_build_ssdt(GArray *table_offsets, GArray *table_data,
/* 0 is reserved for root device. */
nvdimm_build_device_dsm(dev, 0);
+ nvdimm_build_fit_method(dev);
nvdimm_build_nvdimm_devices(dev, ram_slots);
--
1.8.3.1
--
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