Messages in this thread | | | Date | Thu, 27 Jul 2023 10:18:38 +0200 | From | "Arnd Bergmann" <> | Subject | Re: [PATCH] iomem: remove __weak ioremap_cache helper |
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On Thu, Jul 27, 2023, at 02:21, Baoquan He wrote: > On 07/26/23 at 04:54pm, Arnd Bergmann wrote: >> From: Arnd Bergmann <arnd@arndb.de> >> >> No portable code calls into this function any more, and on >> architectures that don't use or define their own, it causes >> a warning: >> >> kernel/iomem.c:10:22: warning: no previous prototype for 'ioremap_cache' [-Wmissing-prototypes] >> 10 | __weak void __iomem *ioremap_cache(resource_size_t offset, unsigned long size) >> >> Fold it into the only caller that uses it on architectures >> without the #define. >> >> Note that the fallback to ioremap is probably still wrong on >> those architectures, but this is what it's always done there. > > Do we need to add a definition of ioremap_cache in asm-generic/io.h like > ioremap_wc|wt? > > #ifndef ioremap_cache > #define ioremap_cahce ioremap > #endif
No, we really want to eliminate ioremap_cache() from the API, not make it more visible.
> Unless it's for sure that drivers calling ioremap_cache are only built in > on those architecures defining it. Or we just want to see the breakage > on those ARCH-es so that they will add their own definition.
Right now, it's only possible to call ioremap_cache() on the couple of architectures that explicitly declare this in their asm/io.h header (arm, arm64, ia64, loongarch, mips, powerpc, sh, x86, and xtensa).
I think we could also go ahead and remove it from sh and xtensa.
> Not sure if I missed anything when understanding this. > > drivers/acpi/apei/bert.c: boot_error_region = > ioremap_cache(bert_tab->address, region_len); > drivers/acpi/apei/einj.c: trigger_tab = > ioremap_cache(trigger_paddr, sizeof(*trigger_tab)); > drivers/acpi/apei/einj.c: trigger_tab = > ioremap_cache(trigger_paddr, table_size); > drivers/acpi/apei/erst.c: erst_erange.vaddr = > ioremap_cache(erst_erange.base, > include/acpi/acpi_io.h: return ioremap_cache(phys, size);
acpi is used on x86, arm64 ia64, and loongarch
> drivers/firmware/meson/meson_sm.c: return > ioremap_cache(sm_phy_base, size);
arm/arm64 specific
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c: > adev->mman.aper_base_kaddr = ioremap_cache(adev->gmc.aper_base, > drivers/gpu/drm/hyperv/hyperv_drm_drv.c: hv->vram = > ioremap_cache(hv->mem->start, hv->fb_size); > drivers/gpu/drm/ttm/ttm_bo_util.c: map->virtual = > ioremap_cache(res, size); > drivers/gpu/drm/ttm/ttm_bo_util.c: vaddr_iomem = > ioremap_cache(mem->bus.offset,
All guardeded with an x86 check
> drivers/hv/hv.c: /* Mask out vTOM bit. ioremap_cache() > maps decrypted */ > drivers/hv/hv.c: = (void *)ioremap_cache(base, > HV_HYP_PAGE_SIZE); > drivers/hv/hv.c: /* Mask out vTOM bit. ioremap_cache() > maps decrypted */ > drivers/hv/hv.c: = (void *)ioremap_cache(base, > HV_HYP_PAGE_SIZE); > drivers/video/fbdev/hyperv_fb.c: fb_virt = > ioremap_cache(par->mem->start, screen_fb_size);
x86 and arm64 specific
> drivers/mtd/devices/bcm47xxsflash.c: b47s->window = > ioremap_cache(res->start, resource_size(res)); > drivers/mtd/maps/pxa2xx-flash.c: info->map.cached = > ioremap_cache(info->map.phys, info->map.size); > drivers/soc/fsl/qbman/qman_ccsr.c: void __iomem *tmpp = > ioremap_cache(addr, sz);
arm/arm64 specific.
There is also one more caller in mips that gets used by dmi:
arch/mips/include/asm/dmi.h:#define dmi_early_remap(x, l) ioremap_cache(x, l) arch/mips/include/asm/dmi.h:#define dmi_remap(x, l) ioremap_cache(x, l)
Arnd
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