| Message ID | 20220531192344.23038-2-i.bornyakov@metrotek.ru (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Microchip Polarfire FPGA manager | expand |
On Tue, May 31, 2022 at 10:23:42PM +0300, Ivan Bornyakov wrote: > At the moment FPGA manager core loads to the device entire image > provided to fpga_mgr_load(). But it is not always whole FPGA image > buffer meant to be written to the device. In particular, .dat formatted > image for Microchip MPF contains meta info in the header that is not > meant to be written to the device. This is issue for those low level > drivers that loads data to the device with write() fpga_manager_ops > callback, since write() can be called in iterator over scatter-gather > table, not only linear image buffer. On the other hand, write_sg() > callback is provided with whole image in scatter-gather form and can > decide itself which part should be sent to the device. > > Add header_size and data_size to the fpga_image_info struct and adjust > fpga_mgr_write() callers with respect to them. > > * info->header_size indicates part at the beginning of image buffer > that is *not* meant to be written to the device. It is optional and > can be 0. > > * info->data_size is the size of actual bitstream data that *is* meant > to be written to the device, starting at info->header_size from the > beginning of image buffer. It is also optional and can be 0, which > means bitstream data is up to the end of image buffer. > > Also add parse_header() callback to fpga_manager_ops, which purpose is > to set info->header_size and info->data_size. At least > initial_header_size bytes of image buffer will be passed into > parse_header() first time. If it is not enough, parse_header() should > set desired size into info->header_size and return -EAGAIN, then it will > be called again with greater part of image buffer on the input. > > Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru> Only one concern left, The XX_PARSE_HEAD state transition is a little messy, see my comments inline. > --- > drivers/fpga/fpga-mgr.c | 176 ++++++++++++++++++++++++++++------ > include/linux/fpga/fpga-mgr.h | 17 +++- > 2 files changed, 165 insertions(+), 28 deletions(-) > > diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c > index a3595ecc3f79..34473d482c21 100644 > --- a/drivers/fpga/fpga-mgr.c > +++ b/drivers/fpga/fpga-mgr.c > @@ -74,6 +74,15 @@ static inline int fpga_mgr_write_complete(struct fpga_manager *mgr, > return 0; > } > > +static inline int fpga_mgr_parse_header(struct fpga_manager *mgr, > + struct fpga_image_info *info, > + const char *buf, size_t count) > +{ > + if (mgr->mops->parse_header) > + return mgr->mops->parse_header(mgr, info, buf, count); > + return 0; > +} > + > static inline int fpga_mgr_write_init(struct fpga_manager *mgr, > struct fpga_image_info *info, > const char *buf, size_t count) > @@ -136,24 +145,57 @@ void fpga_image_info_free(struct fpga_image_info *info) > EXPORT_SYMBOL_GPL(fpga_image_info_free); > > /* > - * Call the low level driver's write_init function. This will do the > + * Call the low level driver's parse_header function. This will set > + * info->header_size and info->data_size. The low level driver gets entire > + * buffer provided. If it is not enough, driver should set desired size into > + * info->header_size and return -EAGAIN, then parse_header() will be called > + * again with greater part of image buffer on the input. > + */ > +static int fpga_mgr_parse_header_buf(struct fpga_manager *mgr, > + struct fpga_image_info *info, > + const char *buf, size_t count) > +{ > + int ret; > + > + mgr->state = FPGA_MGR_STATE_PARSE_HEADER; > + ret = fpga_mgr_parse_header(mgr, info, buf, count); > + if (ret && ret != -EAGAIN) { > + dev_err(&mgr->dev, "Error while parsing FPGA image header\n"); > + mgr->state = FPGA_MGR_STATE_PARSE_HEADER_ERR; Try not to assign the state again and again, or outside the xx_parse_header_xxx() function. If a single function cannot handle all cases, how about having more functions, like fpga_mgr_parse_header_mapped(), fpga_mgr_parse_header_sg_first(), fpga_mgr_parse_header_sg(), and just toggle the state in these functions. > + } > + > + return ret; > +} > + > +/* > + * Call the low level driver's write_init function. This will do the > * device-specific things to get the FPGA into the state where it is ready to > - * receive an FPGA image. The low level driver only gets to see the first > - * initial_header_size bytes in the buffer. > + * receive an FPGA image. If info->header_size is defined, the low level > + * driver gets to see at least first info->header_size bytes in the buffer, > + * mgr->mops->initial_header_size otherwise. If neither initial_header_size > + * nor header_size are not set, write_init will not get any bytes of image > + * buffer. > */ > static int fpga_mgr_write_init_buf(struct fpga_manager *mgr, > struct fpga_image_info *info, > const char *buf, size_t count) > { > + size_t header_size; > int ret; > > mgr->state = FPGA_MGR_STATE_WRITE_INIT; > - if (!mgr->mops->initial_header_size) { > + > + if (info->header_size) > + header_size = info->header_size; > + else > + header_size = mgr->mops->initial_header_size; > + > + if (header_size > count) > + ret = -EINVAL; > + else if (!header_size) > ret = fpga_mgr_write_init(mgr, info, NULL, 0); > - } else { > - count = min(mgr->mops->initial_header_size, count); > + else > ret = fpga_mgr_write_init(mgr, info, buf, count); > - } > > if (ret) { > dev_err(&mgr->dev, "Error preparing FPGA for writing\n"); > @@ -164,16 +206,17 @@ static int fpga_mgr_write_init_buf(struct fpga_manager *mgr, > return 0; > } > > -static int fpga_mgr_write_init_sg(struct fpga_manager *mgr, > - struct fpga_image_info *info, > - struct sg_table *sgt) > +static int fpga_mgr_prepare_sg(struct fpga_manager *mgr, > + struct fpga_image_info *info, > + struct sg_table *sgt) > { > struct sg_mapping_iter miter; > - size_t len; > - char *buf; > + size_t header_size, len; > + char *buf = NULL; > int ret; > > - if (!mgr->mops->initial_header_size) > + header_size = mgr->mops->initial_header_size; > + if (!header_size) > return fpga_mgr_write_init_buf(mgr, info, NULL, 0); > > /* > @@ -182,22 +225,44 @@ static int fpga_mgr_write_init_sg(struct fpga_manager *mgr, > */ > sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG); > if (sg_miter_next(&miter) && > - miter.length >= mgr->mops->initial_header_size) { > - ret = fpga_mgr_write_init_buf(mgr, info, miter.addr, > - miter.length); > - sg_miter_stop(&miter); > - return ret; > + miter.length >= header_size) { > + ret = fpga_mgr_parse_header_buf(mgr, info, miter.addr, > + miter.length); Maybe fpga_mgr_parse_header_sg_first() > + /* > + * If -EAGAIN, more sg buffer is needed, otherwise the flow > + * would always end up in this branch. > + */ > + if (ret != -EAGAIN) { > + if (!ret) > + ret = fpga_mgr_write_init_buf(mgr, info, miter.addr, > + miter.length); > + > + sg_miter_stop(&miter); > + return ret; > + } > } > sg_miter_stop(&miter); > > /* Otherwise copy the fragments into temporary memory. */ > - buf = kmalloc(mgr->mops->initial_header_size, GFP_KERNEL); > - if (!buf) > - return -ENOMEM; > + do { > + if (info->header_size) > + header_size = info->header_size; > + > + buf = krealloc(buf, header_size, GFP_KERNEL); > + if (!buf) > + return -ENOMEM; > + > + len = sg_copy_to_buffer(sgt->sgl, sgt->nents, buf, header_size); > + if (len != header_size) { > + kfree(buf); > + return -EFAULT; > + } > + > + ret = fpga_mgr_parse_header_buf(mgr, info, buf, header_size); > + } while (ret == -EAGAIN); Maybe put the operations in fpga_mgr_parse_header_sg(). > > - len = sg_copy_to_buffer(sgt->sgl, sgt->nents, buf, > - mgr->mops->initial_header_size); > - ret = fpga_mgr_write_init_buf(mgr, info, buf, len); > + if (!ret) > + ret = fpga_mgr_write_init_buf(mgr, info, buf, header_size); > > kfree(buf); > > @@ -227,7 +292,7 @@ static int fpga_mgr_buf_load_sg(struct fpga_manager *mgr, > { > int ret; > > - ret = fpga_mgr_write_init_sg(mgr, info, sgt); > + ret = fpga_mgr_prepare_sg(mgr, info, sgt); > if (ret) > return ret; > > @@ -237,11 +302,40 @@ static int fpga_mgr_buf_load_sg(struct fpga_manager *mgr, > ret = fpga_mgr_write_sg(mgr, sgt); > } else { > struct sg_mapping_iter miter; > + size_t length, data_size; > + bool last = false; > + ssize_t count; > + char *addr; > + > + data_size = info->data_size; > + count = -info->header_size; > > sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG); > while (sg_miter_next(&miter)) { > - ret = fpga_mgr_write(mgr, miter.addr, miter.length); > - if (ret) > + count += miter.length; > + > + /* sg block contains only header, no data */ > + if (count <= 0) > + continue; > + > + if (count < miter.length) { > + /* sg block contains both header and data */ > + addr = miter.addr + miter.length - count; > + length = count; > + } else { > + /* sg block contains pure data */ > + addr = miter.addr; > + length = miter.length; > + } > + > + /* truncate last block to data_size, if needed */ > + if (data_size && count > data_size) { > + length -= count - data_size; > + last = true; > + } > + > + ret = fpga_mgr_write(mgr, addr, length); > + if (ret || last) > break; > } > sg_miter_stop(&miter); > @@ -262,10 +356,34 @@ static int fpga_mgr_buf_load_mapped(struct fpga_manager *mgr, > { > int ret; > > + ret = fpga_mgr_parse_header_buf(mgr, info, buf, count); > + if (ret) { > + if (ret == -EAGAIN) { > + dev_err(&mgr->dev, "Header outruns FPGA image\n"); > + mgr->state = FPGA_MGR_STATE_PARSE_HEADER_ERR; > + ret = -EINVAL; > + } > + > + return ret; > + } > + > + if (info->header_size + info->data_size > count) { > + dev_err(&mgr->dev, "Bitsream data outruns FPGA image\n"); > + mgr->state = FPGA_MGR_STATE_PARSE_HEADER_ERR; > + return -EINVAL; > + } Maybe put the checks in fpga_mgr_parse_header_mapped() Thanks, Yilun > + > ret = fpga_mgr_write_init_buf(mgr, info, buf, count); > if (ret) > return ret; > > + if (info->data_size) > + count = info->data_size; > + else > + count -= info->header_size; > + > + buf += info->header_size; > + > /* > * Write the FPGA image to the FPGA. > */ > @@ -424,6 +542,10 @@ static const char * const state_str[] = { > [FPGA_MGR_STATE_FIRMWARE_REQ] = "firmware request", > [FPGA_MGR_STATE_FIRMWARE_REQ_ERR] = "firmware request error", > > + /* Parse FPGA image header */ > + [FPGA_MGR_STATE_PARSE_HEADER] = "parse header", > + [FPGA_MGR_STATE_PARSE_HEADER_ERR] = "parse header error", > + > /* Preparing FPGA to receive image */ > [FPGA_MGR_STATE_WRITE_INIT] = "write init", > [FPGA_MGR_STATE_WRITE_INIT_ERR] = "write init error", > diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h > index 0f9468771bb9..cba8bb7827a5 100644 > --- a/include/linux/fpga/fpga-mgr.h > +++ b/include/linux/fpga/fpga-mgr.h > @@ -22,6 +22,8 @@ struct sg_table; > * @FPGA_MGR_STATE_RESET: FPGA in reset state > * @FPGA_MGR_STATE_FIRMWARE_REQ: firmware request in progress > * @FPGA_MGR_STATE_FIRMWARE_REQ_ERR: firmware request failed > + * @FPGA_MGR_STATE_PARSE_HEADER: parse FPGA image header > + * @FPGA_MGR_STATE_PARSE_HEADER_ERR: Error during PARSE_HEADER stage > * @FPGA_MGR_STATE_WRITE_INIT: preparing FPGA for programming > * @FPGA_MGR_STATE_WRITE_INIT_ERR: Error during WRITE_INIT stage > * @FPGA_MGR_STATE_WRITE: writing image to FPGA > @@ -42,6 +44,8 @@ enum fpga_mgr_states { > FPGA_MGR_STATE_FIRMWARE_REQ_ERR, > > /* write sequence: init, write, complete */ > + FPGA_MGR_STATE_PARSE_HEADER, > + FPGA_MGR_STATE_PARSE_HEADER_ERR, > FPGA_MGR_STATE_WRITE_INIT, > FPGA_MGR_STATE_WRITE_INIT_ERR, > FPGA_MGR_STATE_WRITE, > @@ -85,6 +89,8 @@ enum fpga_mgr_states { > * @sgt: scatter/gather table containing FPGA image > * @buf: contiguous buffer containing FPGA image > * @count: size of buf > + * @header_size: offset in image buffer where bitstream data starts > + * @data_size: size of bitstream. If 0, (count - header_size) will be used. > * @region_id: id of target region > * @dev: device that owns this > * @overlay: Device Tree overlay > @@ -98,6 +104,8 @@ struct fpga_image_info { > struct sg_table *sgt; > const char *buf; > size_t count; > + size_t header_size; > + size_t data_size; > int region_id; > struct device *dev; > #ifdef CONFIG_OF > @@ -137,9 +145,13 @@ struct fpga_manager_info { > > /** > * struct fpga_manager_ops - ops for low level fpga manager drivers > - * @initial_header_size: Maximum number of bytes that should be passed into write_init > + * @initial_header_size: minimum number of bytes that should be passed into > + * parse_header and write_init. > * @state: returns an enum value of the FPGA's state > * @status: returns status of the FPGA, including reconfiguration error code > + * @parse_header: parse FPGA image header to set info->header_size and > + * info->data_size. In case the input buffer is not large enough, set > + * required size to info->header_size and return -EAGAIN. > * @write_init: prepare the FPGA to receive configuration data > * @write: write count bytes of configuration data to the FPGA > * @write_sg: write the scatter list of configuration data to the FPGA > @@ -155,6 +167,9 @@ struct fpga_manager_ops { > size_t initial_header_size; > enum fpga_mgr_states (*state)(struct fpga_manager *mgr); > u64 (*status)(struct fpga_manager *mgr); > + int (*parse_header)(struct fpga_manager *mgr, > + struct fpga_image_info *info, > + const char *buf, size_t count); > int (*write_init)(struct fpga_manager *mgr, > struct fpga_image_info *info, > const char *buf, size_t count); > -- > 2.35.1 >
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c index a3595ecc3f79..34473d482c21 100644 --- a/drivers/fpga/fpga-mgr.c +++ b/drivers/fpga/fpga-mgr.c @@ -74,6 +74,15 @@ static inline int fpga_mgr_write_complete(struct fpga_manager *mgr, return 0; } +static inline int fpga_mgr_parse_header(struct fpga_manager *mgr, + struct fpga_image_info *info, + const char *buf, size_t count) +{ + if (mgr->mops->parse_header) + return mgr->mops->parse_header(mgr, info, buf, count); + return 0; +} + static inline int fpga_mgr_write_init(struct fpga_manager *mgr, struct fpga_image_info *info, const char *buf, size_t count) @@ -136,24 +145,57 @@ void fpga_image_info_free(struct fpga_image_info *info) EXPORT_SYMBOL_GPL(fpga_image_info_free); /* - * Call the low level driver's write_init function. This will do the + * Call the low level driver's parse_header function. This will set + * info->header_size and info->data_size. The low level driver gets entire + * buffer provided. If it is not enough, driver should set desired size into + * info->header_size and return -EAGAIN, then parse_header() will be called + * again with greater part of image buffer on the input. + */ +static int fpga_mgr_parse_header_buf(struct fpga_manager *mgr, + struct fpga_image_info *info, + const char *buf, size_t count) +{ + int ret; + + mgr->state = FPGA_MGR_STATE_PARSE_HEADER; + ret = fpga_mgr_parse_header(mgr, info, buf, count); + if (ret && ret != -EAGAIN) { + dev_err(&mgr->dev, "Error while parsing FPGA image header\n"); + mgr->state = FPGA_MGR_STATE_PARSE_HEADER_ERR; + } + + return ret; +} + +/* + * Call the low level driver's write_init function. This will do the * device-specific things to get the FPGA into the state where it is ready to - * receive an FPGA image. The low level driver only gets to see the first - * initial_header_size bytes in the buffer. + * receive an FPGA image. If info->header_size is defined, the low level + * driver gets to see at least first info->header_size bytes in the buffer, + * mgr->mops->initial_header_size otherwise. If neither initial_header_size + * nor header_size are not set, write_init will not get any bytes of image + * buffer. */ static int fpga_mgr_write_init_buf(struct fpga_manager *mgr, struct fpga_image_info *info, const char *buf, size_t count) { + size_t header_size; int ret; mgr->state = FPGA_MGR_STATE_WRITE_INIT; - if (!mgr->mops->initial_header_size) { + + if (info->header_size) + header_size = info->header_size; + else + header_size = mgr->mops->initial_header_size; + + if (header_size > count) + ret = -EINVAL; + else if (!header_size) ret = fpga_mgr_write_init(mgr, info, NULL, 0); - } else { - count = min(mgr->mops->initial_header_size, count); + else ret = fpga_mgr_write_init(mgr, info, buf, count); - } if (ret) { dev_err(&mgr->dev, "Error preparing FPGA for writing\n"); @@ -164,16 +206,17 @@ static int fpga_mgr_write_init_buf(struct fpga_manager *mgr, return 0; } -static int fpga_mgr_write_init_sg(struct fpga_manager *mgr, - struct fpga_image_info *info, - struct sg_table *sgt) +static int fpga_mgr_prepare_sg(struct fpga_manager *mgr, + struct fpga_image_info *info, + struct sg_table *sgt) { struct sg_mapping_iter miter; - size_t len; - char *buf; + size_t header_size, len; + char *buf = NULL; int ret; - if (!mgr->mops->initial_header_size) + header_size = mgr->mops->initial_header_size; + if (!header_size) return fpga_mgr_write_init_buf(mgr, info, NULL, 0); /* @@ -182,22 +225,44 @@ static int fpga_mgr_write_init_sg(struct fpga_manager *mgr, */ sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG); if (sg_miter_next(&miter) && - miter.length >= mgr->mops->initial_header_size) { - ret = fpga_mgr_write_init_buf(mgr, info, miter.addr, - miter.length); - sg_miter_stop(&miter); - return ret; + miter.length >= header_size) { + ret = fpga_mgr_parse_header_buf(mgr, info, miter.addr, + miter.length); + /* + * If -EAGAIN, more sg buffer is needed, otherwise the flow + * would always end up in this branch. + */ + if (ret != -EAGAIN) { + if (!ret) + ret = fpga_mgr_write_init_buf(mgr, info, miter.addr, + miter.length); + + sg_miter_stop(&miter); + return ret; + } } sg_miter_stop(&miter); /* Otherwise copy the fragments into temporary memory. */ - buf = kmalloc(mgr->mops->initial_header_size, GFP_KERNEL); - if (!buf) - return -ENOMEM; + do { + if (info->header_size) + header_size = info->header_size; + + buf = krealloc(buf, header_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + len = sg_copy_to_buffer(sgt->sgl, sgt->nents, buf, header_size); + if (len != header_size) { + kfree(buf); + return -EFAULT; + } + + ret = fpga_mgr_parse_header_buf(mgr, info, buf, header_size); + } while (ret == -EAGAIN); - len = sg_copy_to_buffer(sgt->sgl, sgt->nents, buf, - mgr->mops->initial_header_size); - ret = fpga_mgr_write_init_buf(mgr, info, buf, len); + if (!ret) + ret = fpga_mgr_write_init_buf(mgr, info, buf, header_size); kfree(buf); @@ -227,7 +292,7 @@ static int fpga_mgr_buf_load_sg(struct fpga_manager *mgr, { int ret; - ret = fpga_mgr_write_init_sg(mgr, info, sgt); + ret = fpga_mgr_prepare_sg(mgr, info, sgt); if (ret) return ret; @@ -237,11 +302,40 @@ static int fpga_mgr_buf_load_sg(struct fpga_manager *mgr, ret = fpga_mgr_write_sg(mgr, sgt); } else { struct sg_mapping_iter miter; + size_t length, data_size; + bool last = false; + ssize_t count; + char *addr; + + data_size = info->data_size; + count = -info->header_size; sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG); while (sg_miter_next(&miter)) { - ret = fpga_mgr_write(mgr, miter.addr, miter.length); - if (ret) + count += miter.length; + + /* sg block contains only header, no data */ + if (count <= 0) + continue; + + if (count < miter.length) { + /* sg block contains both header and data */ + addr = miter.addr + miter.length - count; + length = count; + } else { + /* sg block contains pure data */ + addr = miter.addr; + length = miter.length; + } + + /* truncate last block to data_size, if needed */ + if (data_size && count > data_size) { + length -= count - data_size; + last = true; + } + + ret = fpga_mgr_write(mgr, addr, length); + if (ret || last) break; } sg_miter_stop(&miter); @@ -262,10 +356,34 @@ static int fpga_mgr_buf_load_mapped(struct fpga_manager *mgr, { int ret; + ret = fpga_mgr_parse_header_buf(mgr, info, buf, count); + if (ret) { + if (ret == -EAGAIN) { + dev_err(&mgr->dev, "Header outruns FPGA image\n"); + mgr->state = FPGA_MGR_STATE_PARSE_HEADER_ERR; + ret = -EINVAL; + } + + return ret; + } + + if (info->header_size + info->data_size > count) { + dev_err(&mgr->dev, "Bitsream data outruns FPGA image\n"); + mgr->state = FPGA_MGR_STATE_PARSE_HEADER_ERR; + return -EINVAL; + } + ret = fpga_mgr_write_init_buf(mgr, info, buf, count); if (ret) return ret; + if (info->data_size) + count = info->data_size; + else + count -= info->header_size; + + buf += info->header_size; + /* * Write the FPGA image to the FPGA. */ @@ -424,6 +542,10 @@ static const char * const state_str[] = { [FPGA_MGR_STATE_FIRMWARE_REQ] = "firmware request", [FPGA_MGR_STATE_FIRMWARE_REQ_ERR] = "firmware request error", + /* Parse FPGA image header */ + [FPGA_MGR_STATE_PARSE_HEADER] = "parse header", + [FPGA_MGR_STATE_PARSE_HEADER_ERR] = "parse header error", + /* Preparing FPGA to receive image */ [FPGA_MGR_STATE_WRITE_INIT] = "write init", [FPGA_MGR_STATE_WRITE_INIT_ERR] = "write init error", diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h index 0f9468771bb9..cba8bb7827a5 100644 --- a/include/linux/fpga/fpga-mgr.h +++ b/include/linux/fpga/fpga-mgr.h @@ -22,6 +22,8 @@ struct sg_table; * @FPGA_MGR_STATE_RESET: FPGA in reset state * @FPGA_MGR_STATE_FIRMWARE_REQ: firmware request in progress * @FPGA_MGR_STATE_FIRMWARE_REQ_ERR: firmware request failed + * @FPGA_MGR_STATE_PARSE_HEADER: parse FPGA image header + * @FPGA_MGR_STATE_PARSE_HEADER_ERR: Error during PARSE_HEADER stage * @FPGA_MGR_STATE_WRITE_INIT: preparing FPGA for programming * @FPGA_MGR_STATE_WRITE_INIT_ERR: Error during WRITE_INIT stage * @FPGA_MGR_STATE_WRITE: writing image to FPGA @@ -42,6 +44,8 @@ enum fpga_mgr_states { FPGA_MGR_STATE_FIRMWARE_REQ_ERR, /* write sequence: init, write, complete */ + FPGA_MGR_STATE_PARSE_HEADER, + FPGA_MGR_STATE_PARSE_HEADER_ERR, FPGA_MGR_STATE_WRITE_INIT, FPGA_MGR_STATE_WRITE_INIT_ERR, FPGA_MGR_STATE_WRITE, @@ -85,6 +89,8 @@ enum fpga_mgr_states { * @sgt: scatter/gather table containing FPGA image * @buf: contiguous buffer containing FPGA image * @count: size of buf + * @header_size: offset in image buffer where bitstream data starts + * @data_size: size of bitstream. If 0, (count - header_size) will be used. * @region_id: id of target region * @dev: device that owns this * @overlay: Device Tree overlay @@ -98,6 +104,8 @@ struct fpga_image_info { struct sg_table *sgt; const char *buf; size_t count; + size_t header_size; + size_t data_size; int region_id; struct device *dev; #ifdef CONFIG_OF @@ -137,9 +145,13 @@ struct fpga_manager_info { /** * struct fpga_manager_ops - ops for low level fpga manager drivers - * @initial_header_size: Maximum number of bytes that should be passed into write_init + * @initial_header_size: minimum number of bytes that should be passed into + * parse_header and write_init. * @state: returns an enum value of the FPGA's state * @status: returns status of the FPGA, including reconfiguration error code + * @parse_header: parse FPGA image header to set info->header_size and + * info->data_size. In case the input buffer is not large enough, set + * required size to info->header_size and return -EAGAIN. * @write_init: prepare the FPGA to receive configuration data * @write: write count bytes of configuration data to the FPGA * @write_sg: write the scatter list of configuration data to the FPGA @@ -155,6 +167,9 @@ struct fpga_manager_ops { size_t initial_header_size; enum fpga_mgr_states (*state)(struct fpga_manager *mgr); u64 (*status)(struct fpga_manager *mgr); + int (*parse_header)(struct fpga_manager *mgr, + struct fpga_image_info *info, + const char *buf, size_t count); int (*write_init)(struct fpga_manager *mgr, struct fpga_image_info *info, const char *buf, size_t count);
At the moment FPGA manager core loads to the device entire image provided to fpga_mgr_load(). But it is not always whole FPGA image buffer meant to be written to the device. In particular, .dat formatted image for Microchip MPF contains meta info in the header that is not meant to be written to the device. This is issue for those low level drivers that loads data to the device with write() fpga_manager_ops callback, since write() can be called in iterator over scatter-gather table, not only linear image buffer. On the other hand, write_sg() callback is provided with whole image in scatter-gather form and can decide itself which part should be sent to the device. Add header_size and data_size to the fpga_image_info struct and adjust fpga_mgr_write() callers with respect to them. * info->header_size indicates part at the beginning of image buffer that is *not* meant to be written to the device. It is optional and can be 0. * info->data_size is the size of actual bitstream data that *is* meant to be written to the device, starting at info->header_size from the beginning of image buffer. It is also optional and can be 0, which means bitstream data is up to the end of image buffer. Also add parse_header() callback to fpga_manager_ops, which purpose is to set info->header_size and info->data_size. At least initial_header_size bytes of image buffer will be passed into parse_header() first time. If it is not enough, parse_header() should set desired size into info->header_size and return -EAGAIN, then it will be called again with greater part of image buffer on the input. Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru> --- drivers/fpga/fpga-mgr.c | 176 ++++++++++++++++++++++++++++------ include/linux/fpga/fpga-mgr.h | 17 +++- 2 files changed, 165 insertions(+), 28 deletions(-)