diff options
| author | Sughosh Ganu <sughosh.ganu@linaro.org> | 2025-03-17 14:04:01 +0530 |
|---|---|---|
| committer | Ilias Apalodimas <ilias.apalodimas@linaro.org> | 2025-03-26 13:28:08 +0200 |
| commit | 54c39bf104017e3a0b30fdff6104141b719af9ef (patch) | |
| tree | 1d3ed658b32edd8196599723a47be5e7db2d34ec /drivers | |
| parent | 45c398028283c73ea24be20a0d0e120d3cd3e850 (diff) | |
blkmap: add an attribute to preserve the mem mapping
Some blkmap memory mapped devices might have to 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>
Reviewed-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/blkmap.c | 19 | ||||
| -rw-r--r-- | drivers/block/blkmap_helper.c | 2 |
2 files changed, 16 insertions, 5 deletions
diff --git a/drivers/block/blkmap.c b/drivers/block/blkmap.c index 08f68570224..1b161bd90be 100644 --- a/drivers/block/blkmap.c +++ b/drivers/block/blkmap.c @@ -33,6 +33,14 @@ struct blkmap; #define BLKMAP_SLICE_MEM BIT(1) /** + * define BLKMAP_SLICE_PRESERVE - Preserved blkmap slice + * + * This blkmap slice is intended to be preserved, and it's + * information passed on to a later stage, like OS. + */ +#define BLKMAP_SLICE_PRESERVE BIT(2) + +/** * struct blkmap_slice - Region mapped to a blkmap * * Common data for a region mapped to a blkmap, specialized by each @@ -253,7 +261,7 @@ 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; @@ -278,6 +286,9 @@ 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); @@ -288,11 +299,11 @@ 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); @@ -303,7 +314,7 @@ 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); |