| Message ID | 20250227111519.45787-6-sughosh.ganu@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add pmem node for preserving distro ISO's | expand |
On tor, feb 27, 2025 at 16:45, Sughosh Ganu <sughosh.ganu@linaro.org> wrote: > Some blkmap memory mapped devices might have to be be relevant even > after U-Boot passes control to the next image as part of the platform > boot. An example of such a mapping would be an OS installer ISO image, > information for which has to be provided to the OS kernel. Use the > 'preserve' attribute for such mappings. The code for adding a pmem > node to the device-tree then checks if this attribute is set, and adds > a node only for mappings which have this attribute. > > Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> > --- This turned out great! Reviewed-by: Tobias Waldekranz <tobias@waldekranz.com>
Thanks Sughosh On Thu, 27 Feb 2025 at 13:15, Sughosh Ganu <sughosh.ganu@linaro.org> wrote: > > Some blkmap memory mapped devices might have to be be relevant even > after U-Boot passes control to the next image as part of the platform > boot. An example of such a mapping would be an OS installer ISO image, > information for which has to be provided to the OS kernel. Use the > 'preserve' attribute for such mappings. The code for adding a pmem > node to the device-tree then checks if this attribute is set, and adds > a node only for mappings which have this attribute. > > Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> > --- > Changes since V4: New patch > > cmd/blkmap.c | 9 +++++++-- > drivers/block/blkmap.c | 12 ++++++++---- > drivers/block/blkmap_helper.c | 2 +- > include/blkmap.h | 4 +++- > 4 files changed, 19 insertions(+), 8 deletions(-) > > diff --git a/cmd/blkmap.c b/cmd/blkmap.c > index 164f80f1387..86a123b1cd3 100644 > --- a/cmd/blkmap.c > +++ b/cmd/blkmap.c > @@ -62,13 +62,18 @@ static int do_blkmap_map_mem(struct map_ctx *ctx, int argc, char *const argv[]) > { > phys_addr_t addr; > int err; > + bool preserve = false; > > if (argc < 2) > return CMD_RET_USAGE; > > addr = hextoul(argv[1], NULL); > > - err = blkmap_map_pmem(ctx->dev, ctx->blknr, ctx->blkcnt, addr); > + if (argc == 3 && !strcmp(argv[2], "preserve")) > + preserve = true; > + > + err = blkmap_map_pmem(ctx->dev, ctx->blknr, ctx->blkcnt, addr, > + preserve); > if (err) { > printf("Unable to map %#llx at block 0x" LBAF ": %d\n", > (unsigned long long)addr, ctx->blknr, err); > @@ -221,7 +226,7 @@ U_BOOT_CMD_WITH_SUBCMDS( > "blkmap create <label> - create device\n" > "blkmap destroy <label> - destroy device\n" > "blkmap map <label> <blk#> <cnt> linear <interface> <dev> <blk#> - device mapping\n" > - "blkmap map <label> <blk#> <cnt> mem <addr> - memory mapping\n", > + "blkmap map <label> <blk#> <cnt> mem <addr> [preserve] - memory mapping\n", > U_BOOT_SUBCMD_MKENT(info, 2, 1, do_blkmap_common), > U_BOOT_SUBCMD_MKENT(part, 2, 1, do_blkmap_common), > U_BOOT_SUBCMD_MKENT(dev, 4, 1, do_blkmap_common), > diff --git a/drivers/block/blkmap.c b/drivers/block/blkmap.c > index 453510cca62..eefed615998 100644 > --- a/drivers/block/blkmap.c > +++ b/drivers/block/blkmap.c > @@ -19,6 +19,7 @@ struct blkmap; > /* Attributes of blkmap slice */ > #define BLKMAP_SLICE_LINEAR BIT(0) > #define BLKMAP_SLICE_MEM BIT(1) > +#define BLKMAP_SLICE_PRESERVE BIT(2) > > /** > * struct blkmap_slice - Region mapped to a blkmap > @@ -241,7 +242,7 @@ static void blkmap_mem_destroy(struct blkmap *bm, struct blkmap_slice *bms) > } > > int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > - void *addr, bool remapped) > + void *addr, bool remapped, bool preserve) > { > struct blkmap *bm = dev_get_plat(dev); > struct blkmap_mem *bmm; > @@ -266,6 +267,9 @@ int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > .remapped = remapped, > }; > > + if (preserve) > + bmm->slice.attr |= BLKMAP_SLICE_PRESERVE; > + > err = blkmap_slice_add(bm, &bmm->slice); > if (err) > free(bmm); > @@ -276,11 +280,11 @@ int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > int blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > void *addr) > { > - return __blkmap_map_mem(dev, blknr, blkcnt, addr, false); > + return __blkmap_map_mem(dev, blknr, blkcnt, addr, false, false); > } > > int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > - phys_addr_t paddr) > + phys_addr_t paddr, bool preserve) > { > struct blkmap *bm = dev_get_plat(dev); > struct blk_desc *bd = dev_get_uclass_plat(bm->blk); > @@ -291,7 +295,7 @@ int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > if (!addr) > return -ENOMEM; > > - err = __blkmap_map_mem(dev, blknr, blkcnt, addr, true); > + err = __blkmap_map_mem(dev, blknr, blkcnt, addr, true, preserve); > if (err) > unmap_sysmem(addr); > > diff --git a/drivers/block/blkmap_helper.c b/drivers/block/blkmap_helper.c > index bfba14110d2..2f1bc28ee5d 100644 > --- a/drivers/block/blkmap_helper.c > +++ b/drivers/block/blkmap_helper.c > @@ -28,7 +28,7 @@ int blkmap_create_ramdisk(const char *label, ulong image_addr, ulong image_size, > bm = dev_get_plat(bm_dev); > desc = dev_get_uclass_plat(bm->blk); > blknum = image_size >> desc->log2blksz; > - ret = blkmap_map_pmem(bm_dev, 0, blknum, image_addr); > + ret = blkmap_map_pmem(bm_dev, 0, blknum, image_addr, true); > if (ret) { > log_err("Unable to map %#llx at block %d : %d\n", > (unsigned long long)image_addr, 0, ret); > diff --git a/include/blkmap.h b/include/blkmap.h > index d53095437fa..754d8671b01 100644 > --- a/include/blkmap.h > +++ b/include/blkmap.h > @@ -60,10 +60,12 @@ int blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > * @blknr: Start block number of the mapping > * @blkcnt: Number of blocks to map > * @paddr: The target physical memory address of the mapping > + * @preserve: Mapping intended to be preserved for subsequent stages, > + * like the OS (e.g. ISO installer) > * Returns: 0 on success, negative error code on failure > */ > int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, > - phys_addr_t paddr); > + phys_addr_t paddr, bool preserve); > > /** > * blkmap_from_label() - Find blkmap from label > -- > 2.34.1 > Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/cmd/blkmap.c b/cmd/blkmap.c index 164f80f1387..86a123b1cd3 100644 --- a/cmd/blkmap.c +++ b/cmd/blkmap.c @@ -62,13 +62,18 @@ static int do_blkmap_map_mem(struct map_ctx *ctx, int argc, char *const argv[]) { phys_addr_t addr; int err; + bool preserve = false; if (argc < 2) return CMD_RET_USAGE; addr = hextoul(argv[1], NULL); - err = blkmap_map_pmem(ctx->dev, ctx->blknr, ctx->blkcnt, addr); + if (argc == 3 && !strcmp(argv[2], "preserve")) + preserve = true; + + err = blkmap_map_pmem(ctx->dev, ctx->blknr, ctx->blkcnt, addr, + preserve); if (err) { printf("Unable to map %#llx at block 0x" LBAF ": %d\n", (unsigned long long)addr, ctx->blknr, err); @@ -221,7 +226,7 @@ U_BOOT_CMD_WITH_SUBCMDS( "blkmap create <label> - create device\n" "blkmap destroy <label> - destroy device\n" "blkmap map <label> <blk#> <cnt> linear <interface> <dev> <blk#> - device mapping\n" - "blkmap map <label> <blk#> <cnt> mem <addr> - memory mapping\n", + "blkmap map <label> <blk#> <cnt> mem <addr> [preserve] - memory mapping\n", U_BOOT_SUBCMD_MKENT(info, 2, 1, do_blkmap_common), U_BOOT_SUBCMD_MKENT(part, 2, 1, do_blkmap_common), U_BOOT_SUBCMD_MKENT(dev, 4, 1, do_blkmap_common), diff --git a/drivers/block/blkmap.c b/drivers/block/blkmap.c index 453510cca62..eefed615998 100644 --- a/drivers/block/blkmap.c +++ b/drivers/block/blkmap.c @@ -19,6 +19,7 @@ struct blkmap; /* Attributes of blkmap slice */ #define BLKMAP_SLICE_LINEAR BIT(0) #define BLKMAP_SLICE_MEM BIT(1) +#define BLKMAP_SLICE_PRESERVE BIT(2) /** * struct blkmap_slice - Region mapped to a blkmap @@ -241,7 +242,7 @@ static void blkmap_mem_destroy(struct blkmap *bm, struct blkmap_slice *bms) } int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, - void *addr, bool remapped) + void *addr, bool remapped, bool preserve) { struct blkmap *bm = dev_get_plat(dev); struct blkmap_mem *bmm; @@ -266,6 +267,9 @@ int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, .remapped = remapped, }; + if (preserve) + bmm->slice.attr |= BLKMAP_SLICE_PRESERVE; + err = blkmap_slice_add(bm, &bmm->slice); if (err) free(bmm); @@ -276,11 +280,11 @@ int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, int blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, void *addr) { - return __blkmap_map_mem(dev, blknr, blkcnt, addr, false); + return __blkmap_map_mem(dev, blknr, blkcnt, addr, false, false); } int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, - phys_addr_t paddr) + phys_addr_t paddr, bool preserve) { struct blkmap *bm = dev_get_plat(dev); struct blk_desc *bd = dev_get_uclass_plat(bm->blk); @@ -291,7 +295,7 @@ int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, if (!addr) return -ENOMEM; - err = __blkmap_map_mem(dev, blknr, blkcnt, addr, true); + err = __blkmap_map_mem(dev, blknr, blkcnt, addr, true, preserve); if (err) unmap_sysmem(addr); diff --git a/drivers/block/blkmap_helper.c b/drivers/block/blkmap_helper.c index bfba14110d2..2f1bc28ee5d 100644 --- a/drivers/block/blkmap_helper.c +++ b/drivers/block/blkmap_helper.c @@ -28,7 +28,7 @@ int blkmap_create_ramdisk(const char *label, ulong image_addr, ulong image_size, bm = dev_get_plat(bm_dev); desc = dev_get_uclass_plat(bm->blk); blknum = image_size >> desc->log2blksz; - ret = blkmap_map_pmem(bm_dev, 0, blknum, image_addr); + ret = blkmap_map_pmem(bm_dev, 0, blknum, image_addr, true); if (ret) { log_err("Unable to map %#llx at block %d : %d\n", (unsigned long long)image_addr, 0, ret); diff --git a/include/blkmap.h b/include/blkmap.h index d53095437fa..754d8671b01 100644 --- a/include/blkmap.h +++ b/include/blkmap.h @@ -60,10 +60,12 @@ int blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, * @blknr: Start block number of the mapping * @blkcnt: Number of blocks to map * @paddr: The target physical memory address of the mapping + * @preserve: Mapping intended to be preserved for subsequent stages, + * like the OS (e.g. ISO installer) * Returns: 0 on success, negative error code on failure */ int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, - phys_addr_t paddr); + phys_addr_t paddr, bool preserve); /** * blkmap_from_label() - Find blkmap from label
Some blkmap memory mapped devices might have to be be relevant even after U-Boot passes control to the next image as part of the platform boot. An example of such a mapping would be an OS installer ISO image, information for which has to be provided to the OS kernel. Use the 'preserve' attribute for such mappings. The code for adding a pmem node to the device-tree then checks if this attribute is set, and adds a node only for mappings which have this attribute. Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> --- Changes since V4: New patch cmd/blkmap.c | 9 +++++++-- drivers/block/blkmap.c | 12 ++++++++---- drivers/block/blkmap_helper.c | 2 +- include/blkmap.h | 4 +++- 4 files changed, 19 insertions(+), 8 deletions(-)