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drivers: disk: nvme: allow building of nvme without mmu

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Some SoCs do not have MMUs. Create a new KConfig that `NVME_PRP_PAGE_SIZE`
that will define the PRP page size, and will default to `MMU_PAGE_SIZE` if
there is a MMU. Otherwise, it defaults to 0x1000.

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>
This commit is contained in:
Ryan McClelland 2025-04-08 11:06:45 -07:00 • committed by Benjamin Cabé
commit 2b5c2748f6
3 changed files with 14 additions and 7 deletions
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7
drivers/disk/nvme/Kconfig
View file

@ -52,6 +52,13 @@ config NVME_REQUEST_TIMEOUT
This sets the waiting time for a request to succeed.
Do not touch this unless you know what you are doing.
config NVME_PRP_PAGE_SIZE
hex "NVMe PRP Page Size"
default MMU_PAGE_SIZE if MMU
default 0x1000
help
Set the PRP page size. If MMU is enabled, this will default to the MMU page size.
config NVME_PRP_LIST_AMOUNT
int "Number of allocated PRP list"
default 2

6
drivers/disk/nvme/nvme_cmd.c
View file

@ -576,13 +576,13 @@ static int compute_n_prp(uintptr_t addr, uint32_t size)
/* See Common Command Format, Data Pointer (DPTR) field */
n_prp = size / CONFIG_MMU_PAGE_SIZE;
n_prp = size / CONFIG_NVME_PRP_PAGE_SIZE;
if (n_prp == 0) {
n_prp = 1;
}
if (size != CONFIG_MMU_PAGE_SIZE) {
size = size % CONFIG_MMU_PAGE_SIZE;
if (size != CONFIG_NVME_PRP_PAGE_SIZE) {
size = size % CONFIG_NVME_PRP_PAGE_SIZE;
}
if (n_prp == 1) {

8
drivers/disk/nvme/nvme_cmd.h
View file

@ -309,14 +309,14 @@ enum nvme_feature {
#define CACHE_LINE_SIZE CONFIG_DCACHE_LINE_SIZE
#endif
#define NVME_PBAO_MASK (CONFIG_MMU_PAGE_SIZE - 1)
#define NVME_PBAO_MASK (CONFIG_NVME_PRP_PAGE_SIZE - 1)
#define NVME_PRP_NEXT_PAGE(_addr) \
((_addr & ~NVME_PBAO_MASK) + CONFIG_MMU_PAGE_SIZE)
((_addr & ~NVME_PBAO_MASK) + CONFIG_NVME_PRP_PAGE_SIZE)
struct nvme_prp_list {
uintptr_t prp[CONFIG_MMU_PAGE_SIZE / sizeof(uintptr_t)]
__aligned(CONFIG_MMU_PAGE_SIZE);
uintptr_t prp[CONFIG_NVME_PRP_PAGE_SIZE / sizeof(uintptr_t)]
__aligned(CONFIG_NVME_PRP_PAGE_SIZE);
sys_dnode_t node;
};