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Date: Wed, 28 Mar 2018 14:14:24 +0100
From: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
To: Niklas Cassel <niklas.cassel@...s.com>,
"kishon@...com" <kishon@...com>,
"cyrille.pitchen@...e-electrons.com"
<cyrille.pitchen@...e-electrons.com>,
Alan Douglas <adouglas@...ence.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Jingoo Han <jingoohan1@...il.com>,
Joao Pinto <Joao.Pinto@...opsys.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Sekhar Nori <nsekhar@...com>,
Shawn Lin <shawn.lin@...k-chips.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Niklas Cassel <niklass@...s.com>,
John Keeping <john@...anate.com>
Cc: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 09/12] PCI: endpoint: Make
epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar
Hi Niklas,
On 28/03/2018 12:50, Niklas Cassel wrote:
> Make epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar.
>
> This is needed so that epc->ops->clear_bar() can clear the BAR pair,
> if the BAR is 64-bits wide.
>
> This also makes it possible for pci_epc_clear_bar() to sanity check
> the flags.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> ---
> drivers/pci/cadence/pcie-cadence-ep.c | 3 ++-
> drivers/pci/dwc/pcie-designware-ep.c | 13 ++++++++++---
> drivers/pci/endpoint/functions/pci-epf-test.c | 5 ++++-
> drivers/pci/endpoint/pci-epc-core.c | 7 ++++---
> include/linux/pci-epc.h | 5 +++--
> 5 files changed, 23 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
> index 2905e098678c..3d8283e450a9 100644
> --- a/drivers/pci/cadence/pcie-cadence-ep.c
> +++ b/drivers/pci/cadence/pcie-cadence-ep.c
> @@ -145,10 +145,11 @@ static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn,
> }
>
> static void cdns_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn,
> - enum pci_barno bar)
> + struct pci_epf_bar *epf_bar)
> {
> struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
> struct cdns_pcie *pcie = &ep->pcie;
> + enum pci_barno bar = epf_bar->barno;
> u32 reg, cfg, b, ctrl;
>
> if (bar < BAR_4) {
> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> index 571b90f88d84..cc4d8381c1dc 100644
> --- a/drivers/pci/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/dwc/pcie-designware-ep.c
> @@ -19,7 +19,8 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
> pci_epc_linkup(epc);
> }
>
> -void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
> +static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
> + int flags)
> {
> u32 reg;
>
> @@ -30,6 +31,11 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
> dw_pcie_dbi_ro_wr_dis(pci);
> }
>
> +void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
> +{
> + __dw_pcie_ep_reset_bar(pci, bar, 0);
> +}
> +
> static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
> struct pci_epf_header *hdr)
> {
> @@ -104,13 +110,14 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
> }
>
> static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
> - enum pci_barno bar)
> + struct pci_epf_bar *epf_bar)
> {
> struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> + enum pci_barno bar = epf_bar->barno;
> u32 atu_index = ep->bar_to_atu[bar];
>
> - dw_pcie_ep_reset_bar(pci, bar);
> + __dw_pcie_ep_reset_bar(pci, bar, epf_bar->flags);
>
> dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_INBOUND);
> clear_bit(atu_index, ep->ib_window_map);
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index d46e3ebabb8e..7cef85124325 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -344,14 +344,17 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
> {
> struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> struct pci_epc *epc = epf->epc;
> + struct pci_epf_bar *epf_bar;
> int bar;
>
> cancel_delayed_work(&epf_test->cmd_handler);
> pci_epc_stop(epc);
> for (bar = BAR_0; bar <= BAR_5; bar++) {
> + epf_bar = &epf->bar[bar];
> +
> if (epf_test->reg[bar]) {
> pci_epf_free_space(epf, epf_test->reg[bar], bar);
> - pci_epc_clear_bar(epc, epf->func_no, bar);
> + pci_epc_clear_bar(epc, epf->func_no, epf_bar);
> }
> }
> }
> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index 8637822605ff..eccc942043cb 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -276,11 +276,12 @@ EXPORT_SYMBOL_GPL(pci_epc_map_addr);
> * pci_epc_clear_bar() - reset the BAR
> * @epc: the EPC device for which the BAR has to be cleared
> * @func_no: the endpoint function number in the EPC device
> - * @bar: the BAR number that has to be reset
> + * @epf_bar: the struct epf_bar that contains the BAR information
> *
> * Invoke to reset the BAR of the endpoint device.
> */
> -void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar)
> +void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
> + struct pci_epf_bar *epf_bar)
> {
> unsigned long flags;
>
> @@ -291,7 +292,7 @@ void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar)
> return;
>
> spin_lock_irqsave(&epc->lock, flags);
> - epc->ops->clear_bar(epc, func_no, bar);
> + epc->ops->clear_bar(epc, func_no, epf_bar);
> spin_unlock_irqrestore(&epc->lock, flags);
> }
> EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
> index 75bae8aabbf9..af657ca58b70 100644
> --- a/include/linux/pci-epc.h
> +++ b/include/linux/pci-epc.h
> @@ -41,7 +41,7 @@ struct pci_epc_ops {
> int (*set_bar)(struct pci_epc *epc, u8 func_no,
> struct pci_epf_bar *epf_bar);
> void (*clear_bar)(struct pci_epc *epc, u8 func_no,
> - enum pci_barno bar);
> + struct pci_epf_bar *epf_bar);
> int (*map_addr)(struct pci_epc *epc, u8 func_no,
> phys_addr_t addr, u64 pci_addr, size_t size);
> void (*unmap_addr)(struct pci_epc *epc, u8 func_no,
> @@ -127,7 +127,8 @@ int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
> struct pci_epf_header *hdr);
> int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
> struct pci_epf_bar *epf_bar);
> -void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar);
> +void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
> + struct pci_epf_bar *epf_bar);
> int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
> phys_addr_t phys_addr,
> u64 pci_addr, size_t size);
>
Seems good to me. :)
Reviewed-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
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