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PCI: epf-mhi: Make use of the alignment restriction from EPF core

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Instead of hardcoding the alignment restriction in the EPF_MHI driver, make
use of the info available from the EPF core that reflects the alignment
restriction of the endpoint controller.

For this purpose, let's introduce the get_align_offset() static function.

[kwilczynski: update get_align_offset() to avoid issues on 32-bit architectures]
Link: https://lore.kernel.org/linux-pci/20230717065459.14138-3-manivannan.sadhasivam@linaro.org
Link: https://lore.kernel.org/linux-pci/20230826150626.23309-1-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
This commit is contained in:
Manivannan Sadhasivam 2023-07-17 12:24:54 +05:30 committed by Krzysztof Wilczyński
parent 8cd2b8ce48
commit d9d9f26f16
No known key found for this signature in database
GPG Key ID: 7C64768D3DE334E7
1 changed files with 14 additions and 7 deletions
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21
drivers/pci/endpoint/functions/pci-epf-mhi.c
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@ -92,6 +92,7 @@ static const struct pci_epf_mhi_ep_info sdx55_info = {
};
struct pci_epf_mhi {
const struct pci_epc_features *epc_features;
const struct pci_epf_mhi_ep_info *info;
struct mhi_ep_cntrl mhi_cntrl;
struct pci_epf *epf;
@ -102,6 +103,11 @@ struct pci_epf_mhi {
int irq;
};
static size_t get_align_offset(struct pci_epf_mhi *epf_mhi, u64 addr)
{
return addr & (epf_mhi->epc_features->align -1);
}
static int __pci_epf_mhi_alloc_map(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr,
phys_addr_t *paddr, void __iomem **vaddr,
size_t offset, size_t size)
@ -133,8 +139,7 @@ static int pci_epf_mhi_alloc_map(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr,
size_t size)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
struct pci_epc *epc = epf_mhi->epf->epc;
size_t offset = pci_addr & (epc->mem->window.page_size - 1);
size_t offset = get_align_offset(epf_mhi, pci_addr);
return __pci_epf_mhi_alloc_map(mhi_cntrl, pci_addr, paddr, vaddr,
offset, size);
@ -159,9 +164,7 @@ static void pci_epf_mhi_unmap_free(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr,
size_t size)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
struct pci_epf *epf = epf_mhi->epf;
struct pci_epc *epc = epf->epc;
size_t offset = pci_addr & (epc->mem->window.page_size - 1);
size_t offset = get_align_offset(epf_mhi, pci_addr);
__pci_epf_mhi_unmap_free(mhi_cntrl, pci_addr, paddr, vaddr, offset,
size);
@ -185,7 +188,7 @@ static int pci_epf_mhi_read_from_host(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
void *to, size_t size)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
size_t offset = from % SZ_4K;
size_t offset = get_align_offset(epf_mhi, from);
void __iomem *tre_buf;
phys_addr_t tre_phys;
int ret;
@ -213,7 +216,7 @@ static int pci_epf_mhi_write_to_host(struct mhi_ep_cntrl *mhi_cntrl,
void *from, u64 to, size_t size)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
size_t offset = to % SZ_4K;
size_t offset = get_align_offset(epf_mhi, to);
void __iomem *tre_buf;
phys_addr_t tre_phys;
int ret;
@ -270,6 +273,10 @@ static int pci_epf_mhi_core_init(struct pci_epf *epf)
return ret;
}
epf_mhi->epc_features = pci_epc_get_features(epc, epf->func_no, epf->vfunc_no);
if (!epf_mhi->epc_features)
return -ENODATA;
return 0;
}