[Intel-gfx] [PATCH i-g-t 1/4] lib/igt_bb_factory: Add igt_bb_factory library
Daniel Vetter
daniel at ffwll.ch
Tue Feb 16 15:54:37 UTC 2016
On Fri, Feb 12, 2016 at 09:38:51AM +0000, Derek Morton wrote:
> Adds functions to create a number of different batch buffers to perform
> several functions including:
> Batch buffer which will run for a long duration to provide a delay on a
> specified ring.
> Function to calibrate the delay batch buffer to run for a specified period
> of time.
> Function to create a batch buffer which writes timestamps to a buffer object.
> Function to compare timestamps allowing for wrapping of the values.
>
> Intended for use by the gem_scheduler test initially but will be used by other
> tests in development.
>
> Signed-off-by: Derek Morton <derek.j.morton at intel.com>
We already have batchbuffer factories and stuff in intel_batchbuffer.c.
Integrating it there also relieves from adding a dummy and fairly useless
topic section header in the docs.
-Daniel
> ---
> lib/Makefile.sources | 2 +
> lib/igt.h | 1 +
> lib/igt_bb_factory.c | 401 +++++++++++++++++++++++++++++++++++++++++++++++++++
> lib/igt_bb_factory.h | 47 ++++++
> 4 files changed, 451 insertions(+)
> create mode 100644 lib/igt_bb_factory.c
> create mode 100644 lib/igt_bb_factory.h
>
> diff --git a/lib/Makefile.sources b/lib/Makefile.sources
> index 4999868..c560b3e 100644
> --- a/lib/Makefile.sources
> +++ b/lib/Makefile.sources
> @@ -7,6 +7,8 @@ libintel_tools_la_SOURCES = \
> i915_reg.h \
> i915_pciids.h \
> igt.h \
> + igt_bb_factory.c \
> + igt_bb_factory.h \
> igt_debugfs.c \
> igt_debugfs.h \
> igt_aux.c \
> diff --git a/lib/igt.h b/lib/igt.h
> index 3be2551..0f29420 100644
> --- a/lib/igt.h
> +++ b/lib/igt.h
> @@ -36,6 +36,7 @@
> #include "igt_gt.h"
> #include "igt_kms.h"
> #include "igt_stats.h"
> +#include "igt_bb_factory.h"
> #include "instdone.h"
> #include "intel_batchbuffer.h"
> #include "intel_chipset.h"
> diff --git a/lib/igt_bb_factory.c b/lib/igt_bb_factory.c
> new file mode 100644
> index 0000000..eea63c6
> --- /dev/null
> +++ b/lib/igt_bb_factory.c
> @@ -0,0 +1,401 @@
> +/*
> + * Copyright © 2016 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + * Authors:
> + * Derek Morton <derek.j.morton at intel.com>
> + *
> + */
> +
> +#include "igt.h"
> +#include "intel_batchbuffer.h"
> +#include <stdint.h>
> +#include <inttypes.h>
> +#include <time.h>
> +
> +#define SEC_TO_NSEC (1000 * 1000 * 1000)
> +#define DWORDS_TO_BYTES(x) ((x)*4)
> +
> +#define MI_STORE_REGISTER_MEM(LENGTH) ((0x024 << 23) | ((LENGTH - 2) & 0xff))
> +#define MI_MATH(NrInst) ((0x01A << 23) | ((NrInst - 1) & 0x3f))
> +#define MI_CONDITIONAL_BATCH_BUFFER_END ((0x036 << 23) | (1 << 21) | 2)
> +#define MI_COPY_MEM_MEM ((0x02E << 23) | (3))
> +
> +#define ALU_LOAD(TO, FROM) ((0x080 << 20) | ((TO) << 10) | (FROM))
> +#define ALU_SUB ( 0x101 << 20)
> +#define ALU_STORE(TO, FROM) ((0x180 << 20) | ((TO) << 10) | (FROM))
> +
> +#define TIMESTAMP_offset (0x358) /* Elapsed time from system start */
> +#define CTX_TIMESTAMP_offset (0x3A8) /* Elapsed Time from context creation */
> +#define ALU_GPU_R0_LSB_offset (0x600)
> +#define ALU_GPU_R0_MSB_offset (0x604)
> +#define ALU_GPU_R1_LSB_offset (0x608)
> +#define ALU_GPU_R1_MSB_offset (0x60C)
> +#define ALU_GPU_R2_LSB_offset (0x610)
> +#define ALU_GPU_R2_MSB_offset (0x614)
> +
> +#define ALU_R0_ENCODING (0x00)
> +#define ALU_R1_ENCODING (0x01)
> +#define ALU_SRCA_ENCODING (0x20)
> +#define ALU_SRCB_ENCODING (0x21)
> +#define ALU_ACCU_ENCODING (0x31)
> +
> +/**
> + * SECTION:igt_bb_factory
> + * @short_description: Utility functions for creating batch buffers
> + * @title: Batch Buffer Factory
> + * @include: igt.h
> + *
> + * This library implements functions for creating batch buffers which may be
> + * useful to multiple tests.
> + */
> +
> +static void check_gen_8(int fd)
> +{
> + static bool checked = false;
> + if(!checked) {
> + igt_require(intel_gen(intel_get_drm_devid(fd)) >= 8);
> + checked = true;
> + }
> +}
> +
> +static int bb_address_size_dw(int fd)
> +{
> + if (intel_gen(intel_get_drm_devid(fd)) >= 8)
> + return 2;
> + else
> + return 1;
> +}
> +
> +static uint32_t get_register_offset(int ringid)
> +{
> + switch (ringid) {
> + case I915_EXEC_RENDER:
> + return 0x02000;
> + case I915_EXEC_BSD:
> + return 0x12000;
> + case I915_EXEC_BLT:
> + return 0x22000;
> + case I915_EXEC_VEBOX:
> + return 0x1A000;
> + default:
> + igt_assert_f(0, "Invalid ringid %d passed to get_register_offset()\n", ringid);
> + }
> +}
> +
> +/**
> + * igt_create_delay_bb:
> + * @fd: file descriptor for i915 driver instance
> + * @bufmgr: Buffer manager to be used for creation of batch buffers
> + * ringid: Ring to create batch buffer for. e.g. I915_EXEC_RENDER
> + * loops: Number of times to loop
> + * dest: Buffer to use for saving the current loop count and timestamp.
> + *
> + * This creates a batch buffer which will iterate a loop a specified number
> + * of times. Intended for creating batch buffers which take an arbitarily
> + * long time to execute. This can be useful to keep a ring busy while
> + * constructing a test scenario.
> + *
> + * The dest buffer will have a number of Dwords written by the batch buffer
> + * when it runs. They are:
> + * DW0 & DW1 - These are loade with the value of 'loops' and are decremented
> + * as the batch buffer executes. They will be 0 after the batch
> + * buffer completes if it finished succesfully.
> + * DW2 Timestamp - An indication of when the batch buffer ran allowing a
> + * comparison between batch buffers to show execution order.
> + * May wrap so igt_compare_timestamps() should be used to
> + * compare timestamps.
> + *
> + * Returns:
> + * The struct intel_batchbuffer created.
> + */
> +struct intel_batchbuffer *igt_create_delay_bb(int fd, drm_intel_bufmgr *bufmgr,
> + int ringid, uint32_t loops, drm_intel_bo *dest)
> +{
> + struct intel_batchbuffer *batch;
> + int addr_size_dw;
> + uint32_t regOffset;
> +
> + check_gen_8(fd);
> +
> + addr_size_dw = bb_address_size_dw(fd);
> + regOffset = get_register_offset(ringid);
> + batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));
> + igt_assert(batch);
> +
> + BEGIN_BATCH(32, 5);
> + /* store current timestamp in DW2 */
> + OUT_BATCH(MI_STORE_REGISTER_MEM(addr_size_dw + 2));
> + OUT_BATCH(regOffset + TIMESTAMP_offset);
> + OUT_RELOC(dest, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, DWORDS_TO_BYTES(2));
> +
> + /* Load R0 with loops */
> + OUT_BATCH(MI_LOAD_REGISTER_IMM);
> + OUT_BATCH(regOffset + ALU_GPU_R0_LSB_offset);
> + OUT_BATCH(loops);
> + OUT_BATCH(MI_LOAD_REGISTER_IMM);
> + OUT_BATCH(regOffset + ALU_GPU_R0_MSB_offset);
> + OUT_BATCH(0x00000000);
> + /* Load R1 with 1 */
> + OUT_BATCH(MI_LOAD_REGISTER_IMM);
> + OUT_BATCH(regOffset + ALU_GPU_R1_LSB_offset);
> + OUT_BATCH(0x00000001);
> + OUT_BATCH(MI_LOAD_REGISTER_IMM);
> + OUT_BATCH(regOffset + ALU_GPU_R1_MSB_offset);
> + OUT_BATCH(0x00000000);
> + /* Copy R0 / R1 into SRCA / SRCB, Perform R0 - R1, Store result in R0 */
> + /* e.g. R0 -= 1 */
> + OUT_BATCH(MI_MATH(4));
> + OUT_BATCH(ALU_LOAD(ALU_SRCA_ENCODING, ALU_R0_ENCODING));
> + OUT_BATCH(ALU_LOAD(ALU_SRCB_ENCODING, ALU_R1_ENCODING));
> + OUT_BATCH(ALU_SUB);
> + OUT_BATCH(ALU_STORE(ALU_R0_ENCODING, ALU_ACCU_ENCODING));
> + /* Copy R0 to dest
> + * On Gen8 MI_CONDITIONAL_BATCH_BUFFER_END BSD ring Compare address
> + * points to 2 Dwords, a mask (DW0) and data (DW1) which are ANDed
> + * together.
> + * On Gen9+, and the other rings on Gen8 Compare address points to
> + * just Data (DW0). For simplicity always copy R0 LSB to DW0 and DW1.
> + */
> + OUT_BATCH(MI_STORE_REGISTER_MEM(addr_size_dw + 2));
> + OUT_BATCH(regOffset + ALU_GPU_R0_LSB_offset);
> + OUT_RELOC(dest, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, 0);
> + OUT_BATCH(MI_STORE_REGISTER_MEM(addr_size_dw + 2));
> + OUT_BATCH(regOffset + ALU_GPU_R0_LSB_offset);
> + OUT_RELOC(dest, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, DWORDS_TO_BYTES(1));
> + /* Repeat until R0 == 0 */
> + OUT_BATCH(MI_CONDITIONAL_BATCH_BUFFER_END);
> + OUT_BATCH(0x00000000);
> + OUT_RELOC(dest, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, 0);
> + OUT_BATCH(MI_BATCH_BUFFER_START | (addr_size_dw - 1));
> + OUT_RELOC(batch->bo, I915_GEM_DOMAIN_INSTRUCTION, 0, DWORDS_TO_BYTES(15));
> + /* Should never get here, but end if it happens */
> +
> + OUT_BATCH(MI_BATCH_BUFFER_END);
> + ADVANCE_BATCH();
> +
> + return batch;
> +}
> +
> +/**
> + * igt_create_timestamp_bb:
> + * @fd: file descriptor for i915 driver instance
> + * @bufmgr: Buffer manager to be used for creation of batch buffers
> + * ringid: Ring to create batch buffer for. e.g. I915_EXEC_RENDER
> + * dest: Buffer to use for saving the timestamps.
> + * load: Buffer to access. Set NULL if not required.
> + * write: If true and load is not NULL, will also write a timestamp to load
> + * buffer. If false and load is not NULL, will read from load buffer into dest.
> + * Intended for dependency checking.
> + *
> + * This creates a batch buffer which writes timestamps into a buffer object.
> + * If 'load' is non null, data is either written to 'load' or copied from 'load'
> + * depending on whether 'write' is set.
> + *
> + * The dest buffer will have a number of Dwords written by the batch buffer
> + * when it runs. They are:
> + * DW0 Reported timestamp - An indication of when the batch buffer ran allowing a
> + * comparison between batch buffers to show execution order.
> + * May wrap so igt_compare_timestamps() should be used to
> + * compare timestamps.
> + * DW1 Context timestamp - Elapsed time since context was created.
> + * DW2 Value copied from DW0 of load if write == false
> + *
> + * Returns:
> + * The struct intel_batchbuffer created.
> + */
> +struct intel_batchbuffer *igt_create_timestamp_bb(int fd, drm_intel_bufmgr *bufmgr,
> + int ringid, drm_intel_bo *dest, drm_intel_bo *load, bool write)
> +{
> + struct intel_batchbuffer *batch;
> + int addr_size_dw;
> + uint32_t regOffset;
> +
> + check_gen_8(fd);
> +
> + addr_size_dw = bb_address_size_dw(fd);
> + regOffset = get_register_offset(ringid);
> + batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));
> + igt_assert(batch);
> +
> + BEGIN_BATCH(6, 2);
> + /* store current reported timestamp in DW0 */
> + OUT_BATCH(MI_STORE_REGISTER_MEM(addr_size_dw + 2));
> + OUT_BATCH(regOffset + TIMESTAMP_offset);
> + OUT_RELOC(dest, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, DWORDS_TO_BYTES(0));
> +
> + /* store current context timestamp in DW1 */
> + OUT_BATCH(MI_STORE_REGISTER_MEM(addr_size_dw + 2));
> + OUT_BATCH(regOffset + CTX_TIMESTAMP_offset);
> + OUT_RELOC(dest, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, DWORDS_TO_BYTES(1));
> +
> + ADVANCE_BATCH();
> +
> + if(load != NULL) {
> + if(write) {
> + BEGIN_BATCH(3, 1);
> + OUT_BATCH(MI_STORE_REGISTER_MEM(addr_size_dw + 2));
> + OUT_BATCH(regOffset + TIMESTAMP_offset);
> + OUT_RELOC(load, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, DWORDS_TO_BYTES(0));
> + ADVANCE_BATCH();
> + }
> + else {
> + BEGIN_BATCH(3, 2);
> + OUT_BATCH(MI_COPY_MEM_MEM);
> + OUT_RELOC(dest, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, DWORDS_TO_BYTES(2));
> + OUT_RELOC(load, I915_GEM_DOMAIN_INSTRUCTION, 0, DWORDS_TO_BYTES(0));
> + ADVANCE_BATCH();
> + }
> + }
> +
> + BEGIN_BATCH(1, 0);
> + OUT_BATCH(MI_BATCH_BUFFER_END);
> + ADVANCE_BATCH();
> +
> + return batch;
> +}
> +
> +/**
> + * igt_create_noop_bb:
> + * @fd: file descriptor for i915 driver instance
> + * @bufmgr: Buffer manager to be used for creation of batch buffers
> + * ringid: Ring to create batch buffer for. e.g. I915_EXEC_RENDER
> + * noops: Number of MI_NOOP instructions to add to the batch buffer.
> + *
> + * This creates a batch buffer with a specified number of MI_NOOP instructions.
> + *
> + * Returns:
> + * The struct intel_batchbuffer created.
> + */
> +struct intel_batchbuffer *igt_create_noop_bb(int fd, drm_intel_bufmgr *bufmgr,
> + int ringid, int noops)
> +{
> + struct intel_batchbuffer *batch;
> + int loop;
> +
> + batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));
> + igt_assert(batch);
> +
> + BEGIN_BATCH(noops + 1, 0);
> + for(loop = 0; loop < noops; loop++)
> + OUT_BATCH(MI_NOOP);
> + OUT_BATCH(MI_BATCH_BUFFER_END);
> + ADVANCE_BATCH();
> +
> + return batch;
> +}
> +
> +/* Store calibrated values so they only need calculating once.
> + * I915_EXEC_RING_MASK allows 3 bits for ring ids so allow for storing 8 values */
> +static uint32_t calibrated_ring_value[8] = {0, 0, 0, 0, 0, 0, 0, 0};
> +
> +/**
> + * igt_calibrate_delay_bb:
> + * @fd: file descriptor for i915 driver instance
> + * @bufmgr: Buffer manager to be used for creation of batch buffers
> + * ringid: Ring to calibrate. e.g. I915_EXEC_RENDER
> + *
> + * This calculates the value of loops that would need to be passed to
> + * igt_create_delay_bb() to create a delay of about 1 second on the specified
> + * ring.
> + *
> + * Returns:
> + * uint32_t to be passed to igt_create_delay_bb().
> + */
> +#define CAL_SEED (0x100000)
> +uint32_t igt_calibrate_delay_bb(int fd, drm_intel_bufmgr *bufmgr, int ringid)
> +{
> + uint32_t *buf;
> + struct intel_batchbuffer *bb;
> + struct timespec start, end;
> + uint64_t duration;
> + uint64_t calibrated;
> + drm_intel_bo *target_bo;
> +
> + igt_assert(ringid < 8);
> + if(calibrated_ring_value[ringid] != 0)
> + return calibrated_ring_value[ringid];
> +
> + target_bo = drm_intel_bo_alloc(bufmgr, "target bo", BATCH_SZ, BATCH_SZ);
> + igt_assert(target_bo);
> +
> + /* Put some non zero values in the target bo */
> + drm_intel_bo_map(target_bo, 1);
> + buf = target_bo->virtual;
> + buf[0] = 0xff;
> + drm_intel_bo_unmap(target_bo);
> +
> + bb = igt_create_delay_bb(fd, bufmgr, ringid, CAL_SEED, target_bo);
> +
> + gem_quiescent_gpu(fd);
> + clock_gettime(CLOCK_MONOTONIC, &start);
> + intel_batchbuffer_flush_on_ring(bb, ringid);
> + /* This will not return until the bo has finished executing */
> + drm_intel_bo_map(target_bo, 0);
> + clock_gettime(CLOCK_MONOTONIC, &end);
> +
> + buf = target_bo->virtual;
> + /* buf[0] in the target buffer should be 0 if the batch buffer completed */
> + igt_assert_f(buf[0] == 0, "buf[0] expected 0x0, got 0x%x\n", buf[0]);
> +
> + duration = ((((uint64_t)end.tv_sec - (uint64_t)start.tv_sec) * SEC_TO_NSEC)
> + + (uint64_t)end.tv_nsec) - (uint64_t)start.tv_nsec;
> +
> + calibrated = (((uint64_t)(CAL_SEED) * SEC_TO_NSEC) / duration);
> + igt_debug("Uncalibrated run took %" PRIu64 ".%04" PRIu64 "s\n",
> + duration / SEC_TO_NSEC,
> + (duration % SEC_TO_NSEC) / 100000);
> + drm_intel_bo_unreference(target_bo);
> + intel_batchbuffer_free(bb);
> +
> + /* Sanity check. If duration < 100ms, something has clearly gone wrong
> + * */
> + igt_assert(duration > (SEC_TO_NSEC / 10));
> +
> + igt_assert_f(calibrated <= UINT32_MAX, "Calibrated value > UINT32_MAX\n");
> +
> + calibrated_ring_value[ringid] = (uint32_t)calibrated;
> + return (uint32_t)calibrated;
> +}
> +
> +/**
> + * igt_compare_timestamps:
> + * @ts1: timestamp 1
> + * @ts2: timestamp 2
> + *
> + * This compares two uint32_t timestamps. To handle wrapping it assumes the
> + * difference between the two timestamps is less than 1/4 the max elapsed time
> + * represented by the counters.
> + * It also assumes the timestamps are samples from the same counter.
> + *
> + * Returns:
> + * True if ts2 > ts1, allowing for counter wrapping, false otherwise.
> + */
> +
> +bool igt_compare_timestamps(uint32_t ts1, uint32_t ts2)
> +{
> + if (ts2 > ts1)
> + return true;
> + else if ((ts1 > 0x80000000) && (ts2 < 0x40000000))
> + return true; /* Assuming timestamp counter wrapped */
> + else
> + return false;
> +}
> diff --git a/lib/igt_bb_factory.h b/lib/igt_bb_factory.h
> new file mode 100644
> index 0000000..3ab7f13
> --- /dev/null
> +++ b/lib/igt_bb_factory.h
> @@ -0,0 +1,47 @@
> +/*
> + * Copyright © 2016 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + * Authors:
> + * Derek Morton <derek.j.morton at intel.com>
> + *
> + */
> +
> +#ifndef IGT_BB_FACTORY_H
> +#define IGT_BB_FACTORY_H
> +
> +#include "intel_batchbuffer.h"
> +#include <stdint.h>
> +
> +struct intel_batchbuffer *igt_create_delay_bb(int fd, drm_intel_bufmgr *bufmgr,
> + int ringid, uint32_t loops, drm_intel_bo *dest);
> +
> +struct intel_batchbuffer *igt_create_timestamp_bb(int fd, drm_intel_bufmgr *bufmgr,
> + int ringid, drm_intel_bo *dest, drm_intel_bo *load, bool write);
> +
> +struct intel_batchbuffer *igt_create_noop_bb(int fd, drm_intel_bufmgr *bufmgr,
> + int ringid, int noops);
> +
> +uint32_t igt_calibrate_delay_bb(int fd, drm_intel_bufmgr *bufmgr, int ringid);
> +
> +bool igt_compare_timestamps(uint32_t ts1, uint32_t ts2);
> +
> +#endif /* IGT_BB_FACTORY_H */
> --
> 1.9.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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